CN112928789B

CN112928789B - Charging method and electronic equipment

Info

Publication number: CN112928789B
Application number: CN202010166806.3A
Authority: CN
Inventors: 孙霓; 赵春江; 张成旭; 朱建伟
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2019-12-05
Filing date: 2020-03-11
Publication date: 2023-03-24
Anticipated expiration: 2040-03-11
Also published as: CN112928789A

Abstract

A charging method and electronic equipment relate to the field of wireless charging, and safe charging of the electronic equipment can be achieved based on components of the existing electronic equipment in a low-temperature environment. If the processor of the electronic equipment detects that the direct current signal is input into the charging interface, periodically detecting the cell temperature of the battery; and if the battery core temperature is lower than the first temperature threshold value, sending a first signal to the wireless charging control module. The wireless charging control module responds to the first signal and transmits an alternating current signal of a first preset frequency to the wireless charging coil. The wireless charging coil generates a first alternating electromagnetic field in response to the alternating current electrical signal. The magnetic shielding material induces the first alternating electromagnetic field to generate heat, so that the temperature of the battery cell can be increased. The processor periodically detects that the cell temperature can detect the cell temperature change, and sends a second signal to the charging control module if the cell temperature is higher than the first temperature threshold. The charging control module receives the direct current signal in response to the second signal, and charges the battery using the direct current signal.

Description

Charging method and electronic equipment

The present application claims priority of chinese patent application entitled "a method of charging at low temperature and electronic device" filed by the national intellectual property office at 2019, 12/05/2019 under the application number 201911235535.6, the entire contents of which are incorporated herein by reference.

Technical Field

The embodiment of the application relates to the field of wireless charging, in particular to a charging method and electronic equipment.

Background

The battery is an indispensable device on the electronic product, and is a tool capable of providing electric power and energy storage for the electronic product. Among them, the battery of the electronic product may store power by charging and then supply power to the electronic product by discharging.

The battery of the electronic product can be composed of a battery core, a protection circuit and a shell. When a battery of an electronic product is charged under a low-temperature condition, the battery may be damaged due to the low temperature of the battery core, and potential safety hazards exist. At present, batteries of electronic products (such as mobile phones or smart bracelets) are generally lithium batteries or nickel-metal hydride batteries. Taking a lithium battery as an example, when the lithium battery is charged, if the temperature of a battery core is low, precipitation of metal lithium on the surface of an electrode is aggravated, and lithium dendrite is formed. The deposition of lithium dendrites can pierce the separator on the surface of the electrode, causing short circuit of the battery and presenting serious safety hazards. Therefore, in the charging safety regulations it is required: when a battery of an electronic product is charged, the cell temperature of the battery must be more than 0 ℃.

However, there is a real need in some scenarios to charge electronic products at low temperatures. For example, in some regions, the temperature is low in winter, so that the cell temperature of the battery of the electronic product is less than 0 ℃. But the user still needs to charge the electronic product. At this time, if the user is prohibited from charging the electronic product, inconvenience may be brought to the user, and user experience may be affected.

In order to improve the charging experience of the battery of the electronic product at low temperature, a scheme of preheating the battery cell before charging is proposed. Taking a mobile phone as an example, as shown in fig. 1, a heating element (such as a resistance wire, a heating film, or a ceramic heater (PTC)) may be added around the battery of the mobile phone. Before the mobile phone is charged, if the temperature of the battery core of the battery is lower than 0 ℃, the battery can be heated by the heating element, so that the temperature of the battery core is increased to be within a safety range, and the low-temperature charging safety is ensured.

However, the addition of the heating element in an electronic product (such as a mobile phone) not only increases the production cost of the electronic product, but also increases the thickness of the electronic product, which affects the aesthetic feeling of the appearance of the electronic product.

Disclosure of Invention

The application provides a charging method and electronic equipment, which can realize safe charging of the electronic equipment based on components of the existing electronic equipment in a low-temperature environment.

In a first aspect, the present application provides an electronic device comprising: the charging system comprises a processor, a battery, a charging control module, a wireless charging coil and a charging interface. The wireless charging coil is covered with a magnetic shielding material. Or a magnetic shielding material is arranged between the wireless charging coil and the battery.

The charging interface is used for receiving a direct current signal. The processor is configured to periodically detect a cell temperature of the battery if it is detected that the charging interface inputs the direct current signal; and if the battery core temperature is lower than the first temperature threshold value, sending a first signal to the wireless charging control module. The wireless charging control module is used for responding to the first signal and transmitting an alternating current signal with a first preset frequency to the wireless charging coil. The first preset frequency is higher than a second preset frequency, and the second preset frequency is the frequency of an alternating current signal for wireless charging of the electronic equipment. The wireless charging coil is used for responding to an alternating current signal with a first preset frequency and generating a first alternating electromagnetic field. The magnetic shielding material can generate first heat when being induced by the first alternating electromagnetic field, and is used for increasing the cell temperature of the battery. The processor is further configured to send a second signal to the charging control module if it is determined that the cell temperature is higher than the first temperature threshold. And the charging control module is used for responding to the second signal, receiving the direct current signal input by the charging interface and charging the battery by using the direct current signal input by the charging interface.

In this application, before the battery is charged for wired through the interface that charges, the treater can detect the electric core temperature of battery. If the cell temperature is less than the preset safe temperature (i.e., the first temperature threshold), the processor may configure the wireless charging control module to drive the wireless charging coil to generate an alternating electromagnetic field at a first preset frequency, so as to simulate a reverse wireless charging process of the electronic device. The first alternating electromagnetic field generates hysteresis loss and eddy current loss in the magnetic shield material, thereby generating heat. Therefore, the battery core can be preheated for the electronic equipment, and the safe charging of the electronic equipment is realized.

Through the scheme of this application, when can utilize the reverse wireless charging of cell-phone, the heat that the magnetic shield material produced realizes that the electricity core preheats. Namely, the safe charging of the electronic equipment can be realized based on the components (such as a wireless charging coil, a magnetic shielding material and the like) of the existing electronic equipment in a low-temperature environment.

In addition, in order to distinguish the wireless charging during the cell preheating from the ordinary wireless charging (including the forward wireless charging and the reverse wireless charging) and quickly realize the cell preheating, the value of the first preset frequency is different from the frequency range of the second preset frequency (i.e., the frequency of the alternating current signal of the electronic device for the wireless charging). The first predetermined frequency is greater than the second predetermined frequency. For example, the first predetermined frequency may be in a range of m KHz to n MHz. Wherein m is larger than 205, n can be any value of 1,1.5 or 2, and the like.

That is, only when the wireless charging control module drives the wireless charging coil to generate an alternating electromagnetic field at the second preset frequency, the other electronic devices can be wirelessly charged through the alternating electromagnetic field. In this application, drive the first alternating electromagnetic field that wireless charging coil produced with first frequency of predetermineeing and can not be responded to by other electronic equipment's wireless charging coil, can not charge for other electronic equipment are wireless. Therefore, when the electronic equipment executes the scheme of the application, the wireless charging of other electronic equipment can be avoided. Therefore, the problem that the electric quantity is lost due to the fact that the electronic equipment can charge other electronic equipment wirelessly in the cell preheating process can be avoided.

With reference to the first aspect, in one possible design, the wireless charging coil generates a first alternating electromagnetic field in response to an alternating current signal at a first preset frequency, and also generates heat. Compared with the heat generated by a magnetic shielding material, the heat generated by the wireless charging coil is less and can be ignored.

With reference to the first aspect, in another possible design manner, in order to protect the battery more effectively, the first temperature threshold may be higher than a cell temperature required in the charging safety specification. For example, assume that the cell temperature must be greater than 0 ℃ as required in the charging safety regulations; then, the first temperature threshold may be a temperature threshold greater than 0 ℃. Of course, in order to improve the charging experience of ensuring that the battery 220 is charged at a low temperature, the first temperature threshold value and the cell temperature required in the charging safety specification may not be too different. For example, the first temperature threshold (e.g., M1) may be 2 ℃,3 ℃, or 5 ℃, etc.

With reference to the first aspect, in another possible design, the environmental temperatures of the electronic device are different, and the time required for preheating the battery cell of the electronic device is different. In order to adapt to different ambient temperatures, in this application, when the core temperature of battery was in different temperature intervals, can be to the alternating current signal of wireless charging coil transmission different frequencies. Specifically, the processor is further configured to determine that the cell temperature is higher than or equal to a second temperature threshold after determining that the cell temperature is lower than the first temperature threshold and before sending the first signal to the wireless charging control module. Wherein the second temperature threshold is lower than the first temperature threshold.

That is, if the cell temperature is lower than the first temperature threshold but greater than or equal to the second temperature threshold, the processor may send a first signal to the wireless charging control module. In this way, the wireless charging control module can transmit an alternating current signal with a first preset frequency to the wireless charging coil in response to the first signal.

It is understood that if the cell temperature is lower than the first temperature threshold but greater than or equal to the second temperature threshold, it indicates that the cell temperature of the battery is within a small difference from the cell temperature (e.g., 0 ℃) required in the charge safety specification. At the moment, the alternating electric signal with the first preset frequency is transmitted to the wireless charging coil, so that the cell preheating is completed in a short time, and the safe charging of the electronic equipment is realized.

With reference to the first aspect, in another possible design manner, the processor is further configured to transmit a third signal to the wireless charging control module when it is determined that the cell temperature is lower than the second temperature threshold. The wireless charging control module is further configured to transmit an ac signal of a third preset frequency to the wireless charging coil in response to the third signal. The wireless charging coil is also used for responding to the alternating current signal of the third preset frequency and generating a second alternating electromagnetic field. The magnetic shielding material is used for inducing a second alternating electromagnetic field to generate second heat to improve the temperature of the battery core.

Wherein, the larger the frequency of the alternating electric signal is, the larger the heat generated by hysteresis loss and eddy current loss of the alternating electromagnetic field on the magnetic shielding material is. The third preset frequency is higher than the first preset frequency; therefore, the second amount of heat is greater than the first amount of heat.

It is understood that if the cell temperature is lower than the first temperature threshold and lower than the second temperature threshold, it indicates that the cell temperature of the battery is greatly different from the cell temperature (e.g., 0 ℃) required in the charging safety specification. At this moment, in order to promote the efficiency that the electric core preheats, shorten the time that the electric core preheats, can increase the drive frequency of wireless charging coil to increase induction heating's power.

In this application, can be according to the electric core temperature of battery, select corresponding frequency of predetermineeing in order to drive wireless charging coil and produce alternating electromagnetic field to carry out electric core and preheat. Like this, can be less than first temperature threshold value at electric core temperature, and electric core temperature (as 0 ℃) that requires among electric core temperature and the charging safety standard when the difference is great (electric core temperature is less than second temperature threshold value promptly), can increase wireless charging coil's drive frequency, can promote the efficiency that electric core preheated, shorten the time that electric core preheated.

With reference to the first aspect, in another possible design, an energy source for cell preheating may be provided by a battery. Specifically, the wireless charging control module is configured to receive a first signal, and transmit an ac signal with a first preset frequency to the wireless charging coil in response to the first signal, and includes: the wireless charging control module is used for receiving a first signal; responding to the first signal, receiving a direct current signal from the battery, and converting the direct current signal from the battery into an alternating current signal with a first preset frequency; and transmitting an alternating current signal of a first preset frequency to the wireless charging coil.

Generally, the electronic device wirelessly charges the other electronic devices in reverse direction by providing an energy source from a battery of the electronic device. In this application, cell preheating may be performed by providing an energy source from a battery. However, if the energy source for cell preheating is provided by the battery; then, the battery power is consumed before the battery is charged. Therefore, in the process of charging the battery, the electric quantity of the battery may be reduced and then increased, which is likely to cause unnecessary misunderstanding of the user, and thus the user may misunderstand that the battery is faulty. Moreover, the more the number of charging and discharging of the battery is, the more the battery is worn, which affects the service life of the battery. In another possible embodiment, an energy source for cell preheating may be provided by a dc signal input by the charging interface.

With reference to the first aspect, in another possible design, an energy source for cell preheating may be provided by a direct current signal input by the charging interface. Specifically, the wireless charging control module is configured to receive a first signal, and transmit an ac signal with a first preset frequency to the wireless charging coil in response to the first signal, and includes: the wireless charging control module is used for receiving a first signal; responding to the first signal, receiving a direct current signal input by the charging interface, and converting the direct current signal input by the charging interface into an alternating current signal with a first preset frequency; and transmitting the alternating current signal of the first preset frequency to a wireless charging coil.

The direct current signal input by the charging interface provides an energy source for preheating the battery core, so that the phenomenon that a user mistakenly regards a battery fault can be avoided, unnecessary loss of the battery can be reduced, and the service life of the battery is prolonged.

It will be appreciated that if there are other metal objects around the electronic device; then, the alternating electromagnetic field generated by the preheating of the electric core by the electronic device can not only enable the magnetic shielding material and the wireless charging coil to generate heat, but also enable the other metal objects to generate heat. If the other metal object generates more heat, flammable objects around the other metal object may be burned, and a safety hazard exists. If a human body exists in the preset distance of the electronic equipment, the alternating electromagnetic field generated by the alternating current signal with the first preset frequency or the third preset frequency can radiate the human body, and if the radiation exceeds the standard, the human body can be damaged.

Based on this, in combination with the first aspect, in another possible design manner, it may be determined that no conductor is within a preset distance around the electronic device before the cell preheating is performed. The conductor comprises a human body or a metal object.

Specifically, the processor is further configured to determine that no conductor is within a predetermined distance around the electronic device before sending the first signal to the radio charging control module. If no conductor exists in the preset distance around the electronic equipment, the possibility that potential safety hazards exist is low if the electric core of the electronic equipment is preheated, and the possibility that the electric core is damaged to a human body is low. Therefore, the safety performance of electric core preheating of the electronic equipment can be improved, and the safe charging of the electronic equipment is realized.

With reference to the first aspect, in another possible design manner, the processor is further configured to send a prompt message if it is determined that there is a conductor within the preset distance. The prompt is for prompting the user to remove the conductor. If the user removes the conductor in the preset distance of the electronic equipment, the electronic equipment can safely preheat the battery cell.

With reference to the first aspect, in another possible design manner, the electronic device further includes a Specific Absorption Rate (SAR) sensor. The processor can detect whether a conductor (such as a metal object or a human body) exists within a preset distance through data acquired by the SAR sensor. The method for judging whether a conductor exists in the preset distance through the SAR sensor by the processor can refer to related descriptions in the conventional technology, and is not repeated herein.

It can be understood that if someone is in the preset distance of the electronic device, in order to avoid that the radiation of the alternating electromagnetic field generated by the alternating current signal with the first preset frequency or the third preset frequency to the human body exceeds standard and damages the human body, the electronic device does not preheat the electric core.

That is to say, the processor sends the first signal to the wireless charging control module to preheat the battery cell when detecting that no conductor (including a human body) exists within the preset distance through the data collected by the SAR sensor. Therefore, the radiation overproof to the human body caused by the alternating electromagnetic field generated by the alternating current signal with the first preset frequency or the third preset frequency can be avoided, and the damage to the human body can be avoided.

With reference to the first aspect, in another possible design manner, the wireless charging control module is further configured to, after receiving the first signal, if the first signal is not received within a preset time period, stop transmitting an ac signal with a first preset frequency to the wireless charging coil. And the preset time length is longer than the period of the processor for periodically detecting the temperature of the battery core.

From the above description it follows that: the processor only sends a first signal to the wireless charging control module when the cell temperature is lower than a first temperature threshold. In other words, if the cell temperature is consistently below the first temperature threshold; then, at intervals of one cycle, the wireless charging control module may receive a first signal. If the first signal is not received by the wireless charging control module within the preset time period after the wireless charging control module receives any one signal 1, the cell temperature is higher than or equal to the first temperature threshold. In this case, the cell temperature may no longer be raised.

If the wireless charging control module stops transmitting the alternating current signal of the first preset frequency to the wireless charging coil; then, wireless charging coil then can't produce above-mentioned first alternating electromagnetic field to can not make magnetic screen material and wireless charging coil produce the heat, and then can stop electric core and preheat, no longer promote electric core temperature.

With reference to the first aspect, in another possible design manner, the functions of the wireless charging control module and the charging control module may be implemented in a single module (e.g., a charging management module).

In a second aspect, the present application provides an electronic device, which is a first electronic device, comprising: the device comprises a processor, a charging management module, a battery and a wireless charging coil. This wireless charging coil coats outward and has the magnetic screen material, perhaps is provided with the magnetic screen material between wireless charging coil and the battery.

The processor is used for periodically detecting the battery core temperature of the battery after the wireless charging coil and the second electronic device perform wireless charging protocol interaction. The second electronic device is used for wirelessly charging the first electronic device. The processor is further configured to send a first signal to the second electronic device through the wireless charging coil if it is determined that the cell temperature is lower than the first temperature threshold. The first signal is used for requesting the second electronic device to generate a first alternating electromagnetic field by using an alternating current signal with a first preset frequency. The first predetermined frequency is higher than the second predetermined frequency. The second preset frequency is the frequency of the alternating current signal for the first electronic device to wirelessly charge. The magnetic shielding material can generate first heat when being induced by the first alternating electromagnetic field, and is used for increasing the temperature of the battery core. The processor is further configured to determine that the cell temperature is higher than or equal to a first temperature threshold, and send a second signal to the second electronic device through the wireless charging coil. The second signal is used for requesting the second electronic device to generate a second alternating electromagnetic field with an alternating current electric signal of a second preset frequency. The wireless charging coil is also used for inducing the second alternating electromagnetic field to generate an alternating current signal and transmitting the alternating current signal to the charging management module. The charging management module is used for receiving the alternating current signal from the wireless charging coil, converting the alternating current signal into a direct current signal and charging the battery by using the direct current signal.

In this application, before wirelessly charging the battery, the first electronic device may detect a cell temperature of the battery. If the cell temperature is lower than a preset safety temperature (i.e., a first temperature threshold), the first electronic device may request the second electronic device to generate an alternating electromagnetic field with an alternating current signal of a first preset frequency, so as to implement induction heating. Therefore, the magnetic shielding material and the wireless charging coil can generate heat, and the cell is preheated before the battery is wirelessly charged.

Through the scheme of this application, when can utilize first electronic equipment forward wireless charging, the heat that the magnetic shield material produced realizes that the electric core preheats. Namely, under a low-temperature environment, the safe charging of the electronic equipment is realized based on components (such as a wireless charging coil, a magnetic shielding material and the like) of the existing electronic equipment.

With reference to the second aspect, in a possible design manner, the environmental temperatures of the first electronic device are different, and the time required for preheating the battery cell of the first electronic device is different. In order to adapt to different environmental temperatures, in the present application, when the cell temperature of the battery is in different temperature intervals, different alternating electromagnetic fields may be generated to the alternating current signals requesting the second electronic device to generate different preset frequencies. Specifically, the processor is further configured to determine that the cell temperature is higher than or equal to a second temperature threshold after determining that the cell temperature is lower than the first temperature threshold and before sending the first signal to the second electronic device. The second temperature threshold is lower than the first temperature threshold.

That is, if the cell temperature is lower than the first temperature threshold but greater than or equal to the second temperature threshold, the first electronic device may request the second electronic device to generate the first alternating electromagnetic field with an alternating current signal at the first preset frequency. In this way, the magnetic shielding material of the first electronic device may generate the first heat in response to the first alternating electromagnetic field, so as to raise the cell temperature.

It is understood that if the cell temperature is lower than the first temperature threshold but greater than or equal to the second temperature threshold, it indicates that the cell temperature of the battery is within a small difference from the cell temperature (e.g., 0 ℃) required in the charge safety specification. At this time, the second electronic device is requested to generate a first alternating electromagnetic field by using an alternating current signal with a first preset frequency, which is enough to complete cell preheating in a short time.

With reference to the second aspect, in another possible design manner, the processor is further configured to send a third signal to the second electronic device when it is determined that the cell temperature is lower than the second temperature threshold. The third signal is for requesting the second electronic device to generate a third alternating electromagnetic field with an alternating current signal of a third preset frequency. The third predetermined frequency is higher than the first predetermined frequency. The magnetic shielding material is used for inducing a third alternating electromagnetic field to generate second heat for increasing the temperature of the battery core.

Wherein, the larger the frequency of the alternating electric signal is, the larger the heat generated by the hysteresis loss and the eddy current loss of the alternating electromagnetic field on the magnetic shielding material is. The third preset frequency is higher than the first preset frequency; therefore, the second amount of heat is greater than the first amount of heat.

It can be understood that, if the cell temperature is lower than the first temperature threshold and lower than the second temperature threshold, it indicates that the cell temperature of the battery is greatly different from the cell temperature (e.g. 0 ℃) required in the charging safety specification. At this moment, in order to improve the efficiency of cell preheating, shorten the time of cell preheating, can increase the drive frequency of wireless charging coil to increase induction heating's power.

In a third aspect, the present application provides an electronic device that is a second electronic device configured to wirelessly charge a first electronic device. The second electronic device includes: the device comprises a processor, a charging management module, a battery and a wireless charging coil.

The processor is configured to receive a first signal from a first electronic device after performing wireless charging protocol interaction with the first electronic device through a wireless charging coil. The first signal is used for requesting the second electronic device to generate an alternating electromagnetic field with an alternating current electric signal of a first preset frequency. The first predetermined frequency is higher than the second predetermined frequency. The second preset frequency is the frequency of the alternating current signal for the first electronic device to wirelessly charge. The processor is further configured to instruct the charging management module to transmit an alternating current signal with a first preset frequency to the wireless charging coil in response to the first signal. The charging management module is used for converting the direct current signals from the battery into alternating current signals with first preset frequency according to the indication of the processor, and transmitting the alternating current signals with the first preset frequency to the wireless charging coil. The wireless charging coil is used for responding to an alternating current signal with a first preset frequency and generating a first alternating electromagnetic field. The first alternating electromagnetic field acts on a magnetic shielding material of the first electronic device to generate first heat, and the first heat is used for increasing the cell temperature of the first electronic device. The processor is further configured to receive a second signal from the first electronic device through the wireless charging coil. The second signal is used for requesting the second electronic device to generate an alternating electromagnetic field with an alternating current electric signal of a second preset frequency. The processor is further configured to instruct the charging management module to transmit an alternating current signal with a second preset frequency to the wireless charging coil in response to the second signal. The charging management module is further configured to convert a direct current signal from the battery into an alternating current signal with a second preset frequency according to an instruction of the processor, and transmit the alternating current signal with the second preset frequency to the wireless charging coil. The wireless charging coil is also used for responding to an alternating current signal with a second preset frequency and generating a second alternating electromagnetic field. The second alternating electromagnetic field acts on a wireless charging coil of the first electronic device for charging the first electronic device.

With reference to the third aspect, in a possible design, the processor is further configured to receive a third signal from the first electronic device through the wireless charging coil. The third signal is used to request the second electronic device to generate an alternating electromagnetic field with an alternating current electric signal of a third preset frequency. The third predetermined frequency is higher than the first predetermined frequency. The processor is further configured to instruct the charging management module to transmit an alternating current signal with a third preset frequency to the wireless charging coil in response to the third signal. The charging management module is further configured to convert a direct current signal from the battery into an alternating current signal with a third preset frequency according to an instruction of the processor, and transmit the alternating current signal with the third preset frequency to the wireless charging coil. The wireless charging coil is also used for responding to an alternating current signal with a third preset frequency to generate a third alternating electromagnetic field, and the third alternating electromagnetic field acts on the magnetic shielding material of the first electronic equipment to generate second heat for increasing the battery core temperature of the first electronic equipment.

It should be noted that, beneficial effects that can be achieved by the technical solutions described in the third aspect and any one of the possible design manners thereof can refer to the beneficial effects in the second aspect and any one of the possible design manners thereof, and are not described herein again.

In a fourth aspect, the present application provides a charging system, which includes a first electronic device and a second electronic device, where the second electronic device is configured to wirelessly charge the first electronic device.

After the first electronic device and the second electronic device perform wireless charging protocol interaction, the cell temperature of a battery of the first electronic device can be periodically detected.

The first electronic device may send a first signal to the second electronic device if it is determined that the cell temperature is lower than the first temperature threshold. The first signal is used for requesting the second electronic device to generate a first alternating electromagnetic field by an alternating current signal with a first preset frequency. The first preset frequency is higher than a second preset frequency, and the second preset frequency is the frequency of an alternating current signal for wireless charging of the first electronic device. The second electronic device may receive a first signal from the first electronic device, and in response to the first signal, may generate a first alternating electromagnetic field at an alternating current signal of a first preset frequency. The magnetic shielding material in the first electronic device can generate first heat when being induced by the first alternating electromagnetic field, so that the temperature of the battery cell is increased.

The first electronic device may send a second signal to the second electronic device if it is determined that the cell temperature is higher than or equal to the first temperature threshold. The second signal is used for requesting the second electronic device to generate a second alternating electromagnetic field with the alternating current electric signal of the second preset frequency. The second electronic device may receive a second signal from the first electronic device, in response to which a second alternating electromagnetic field may be generated with an alternating current electric signal of a second preset frequency. The first electronic equipment can generate an alternating current signal by inducing the second alternating electromagnetic field through a wireless charging coil; the ac electrical signal may then be converted to a dc electrical signal and used to charge the battery.

It should be noted that beneficial effects that can be achieved by the technical solution described in the fourth aspect may refer to beneficial effects in the second aspect and any one of the possible design manners thereof, and are not described herein again.

In a fifth aspect, the present application provides a charging method, which may be applied to an electronic device, the electronic device including: the charging system comprises a processor, a battery, a charging control module, a wireless charging coil and a charging interface. The wireless charging coil is covered with magnetic shielding material, or the wireless charging coil and the battery are provided with magnetic shielding material therebetween.

The method can comprise the following steps: the charging interface receives a direct current signal; if the processor detects that the direct current signal is input into the charging interface, periodically detecting the cell temperature of the battery; the processor determines that the battery core temperature is lower than a first temperature threshold value, and sends a first signal to the wireless charging control module; the wireless charging control module receives a first signal, responds to the first signal and transmits an alternating current signal with a first preset frequency to the wireless charging coil; the wireless charging coil responds to an alternating current signal with a first preset frequency and generates a first alternating electromagnetic field; the magnetic shielding material is used for inducing a first alternating electromagnetic field to generate first heat for increasing the temperature of the battery core; the processor determines that the battery core temperature is higher than a first temperature threshold value, and then sends a second signal to the charging control module; the charging control module receives the second signal, responds to the second signal, receives the direct current signal input by the charging interface, and charges the battery by using the direct current signal input by the charging interface.

The first preset frequency is higher than a second preset frequency, and the second preset frequency is the frequency of an alternating current signal for wireless charging of the electronic equipment.

With reference to the fifth aspect, in a possible design manner, the method may further include: the processor determines, after determining that the cell temperature is below a first temperature threshold, that the cell temperature is above or equal to a second temperature threshold, wherein the second temperature threshold is below the first temperature threshold, before sending the first signal to the wireless charging control module.

With reference to the fifth aspect, in another possible design manner, the method may further include: the processor determines that the battery core temperature is lower than a second temperature threshold value, and transmits a third signal to the wireless charging control module; the wireless charging control module receives a third signal, responds to the third signal and transmits an alternating current signal with a third preset frequency to the wireless charging coil, wherein the third preset frequency is higher than the first preset frequency; the wireless charging coil responds to an alternating current signal with a third preset frequency to generate a second alternating electromagnetic field, wherein the magnetic shielding material induces the second alternating electromagnetic field to generate second heat for increasing the temperature of the battery core.

With reference to the fifth aspect, in another possible design manner, the receiving, by the wireless charging control module, a first signal, and transmitting an ac electrical signal with a first preset frequency to the wireless charging coil in response to the first signal, may include: the wireless charging control module receives a first signal; responding to the first signal, receiving a direct current signal input by the charging interface, and converting the direct current signal input by the charging interface into an alternating current signal with a first preset frequency; and transmitting an alternating current signal of a first preset frequency to the wireless charging coil.

With reference to the fifth aspect, in another possible design manner, the receiving, by the wireless charging control module, a first signal, and transmitting an ac electrical signal with a first preset frequency to the wireless charging coil in response to the first signal, may include: the wireless charging control module receives a first signal; responding to the first signal, receiving a direct current signal from the battery, and converting the direct current signal from the battery into an alternating current signal with a first preset frequency; and transmitting an alternating current signal of a first preset frequency to the wireless charging coil.

With reference to the fifth aspect, in another possible design manner, the method may further include: the processor determines that there are no conductors within a predetermined distance around the electronic device before sending the first signal to the wireless charging control module. The conductor comprises a human body or a metal object.

With reference to the fifth aspect, in another possible design manner, the method may further include: and if the processor determines that the conductor exists in the preset distance, sending out prompt information, wherein the prompt information is used for prompting a user to remove the conductor.

With reference to the fifth aspect, in another possible design manner, the electronic device further includes a SAR sensor. The determining, by the processor, that there is no conductor within a preset distance around the electronic device may include: the processor detects that no conductor exists in the preset distance through data acquired by the SAR sensor.

With reference to the fifth aspect, in another possible design manner, the method may further include: after the wireless charging control module receives the first signal, if the first signal is not received within a preset time length, the wireless charging control module stops transmitting an alternating current signal with a first preset frequency to the wireless charging coil, wherein the preset time length is greater than a period of periodically detecting the temperature of the battery core by the processor.

With reference to the fifth aspect, in another possible design manner, the functions of the charging control module and the wireless charging control module are integrated into one charging management module.

It should be noted that, beneficial effects that can be achieved by the technical solutions described in the fifth aspect and any one of the possible design manners thereof can refer to the beneficial effects in the first aspect and any one of the possible design manners thereof, and are not described herein again.

In a sixth aspect, the present application provides a charging method, which may be applied to an electronic device, which is a first electronic device. The first electronic device includes: the device comprises a processor, a charging management module, a battery and a wireless charging coil. The wireless charging coil is covered with magnetic shielding material, or is provided with magnetic shielding material between wireless charging coil and the battery.

The method can comprise the following steps: after the processor performs wireless charging protocol interaction with second electronic equipment through a wireless charging coil, periodically detecting the cell temperature of the battery, wherein the second electronic equipment is used for wirelessly charging the first electronic equipment; the processor determines that the cell temperature is lower than a first temperature threshold, and then sends a first signal to the second electronic device through the wireless charging coil, wherein the first signal is used for requesting the second electronic device to generate a first alternating electromagnetic field with an alternating current signal of a first preset frequency, the first preset frequency is higher than a second preset frequency, the second preset frequency is the frequency of the alternating current signal of the electronic device for wireless charging, and the magnetic shielding material induces the first alternating electromagnetic field to generate first heat for increasing the cell temperature; the processor determines that the cell temperature is higher than or equal to a first temperature threshold value, and sends a second signal to the second electronic device through the wireless charging coil, wherein the second signal is used for requesting the second electronic device to generate a second alternating electromagnetic field by using an alternating current signal with a second preset frequency; the wireless charging coil induces the second alternating electromagnetic field to generate an alternating current signal and transmits the alternating current signal to the charging management module; the charging management module receives an alternating current signal from the wireless charging coil, converts the alternating current signal into a direct current signal, and charges the battery by using the direct current signal.

With reference to the sixth aspect, in a possible design manner, the method may further include: the processor determines that the cell temperature is greater than or equal to a second temperature threshold, the second temperature threshold being lower than the first temperature threshold, after determining that the cell temperature is lower than the first temperature threshold, before sending the first signal to the second electronic device.

With reference to the sixth aspect, in another possible design manner, the method further includes: and if the processor determines that the cell temperature is lower than the second temperature threshold, a third signal is sent to the second electronic device, the third signal is used for requesting the second electronic device to generate a third alternating electromagnetic field by using an alternating current signal with a third preset frequency, the third preset frequency is higher than the first preset frequency, and the magnetic shielding material is induced by the third alternating electromagnetic field to generate second heat for increasing the cell temperature.

In a seventh aspect, the present application provides a charging method, which may be applied to an electronic device, which is a second electronic device. The second electronic device is used for wirelessly charging the first electronic device. The second electronic device includes: the device comprises a processor, a charging management module, a battery and a wireless charging coil.

The method can comprise the following steps: the method comprises the steps that after a processor interacts with a first electronic device through a wireless charging protocol through a wireless charging coil, the processor receives a first signal from the first electronic device, wherein the first signal is used for requesting a second electronic device to generate an alternating current electromagnetic field through an alternating current signal with a first preset frequency, the first preset frequency is higher than a second preset frequency, and the second preset frequency is the frequency of the alternating current signal for wireless charging of the electronic device; the processor responds to the first signal and instructs the charging management module to transmit an alternating current signal with a first preset frequency to the wireless charging coil; the charging management module converts a direct current signal from the battery into an alternating current signal with a first preset frequency according to the indication of the processor, and transmits the alternating current signal with the first preset frequency to the wireless charging coil; the wireless charging coil responds to an alternating current signal with a first preset frequency to generate a first alternating electromagnetic field, and the first alternating electromagnetic field acts on a magnetic shielding material of the first electronic device to generate first heat for increasing the temperature of a battery cell of the first electronic device; the processor receives a second signal from the first electronic device through the wireless charging coil, the second signal for requesting the second electronic device to generate an alternating electromagnetic field with an alternating current electric signal of a second preset frequency; the processor responds to the second signal and instructs the charging management module to transmit an alternating current signal with a second preset frequency to the wireless charging coil; the charging management module converts a direct current signal from the battery into an alternating current signal with a second preset frequency according to the instruction of the processor, and transmits the alternating current signal with the second preset frequency to the wireless charging coil; the wireless charging coil responds to an alternating current signal with a second preset frequency to generate a second alternating electromagnetic field, and the second alternating electromagnetic field acts on the wireless charging coil of the first electronic device and is used for charging the first electronic device.

With reference to the seventh aspect, in a possible design manner, the method further includes: the processor receives a third signal from the first electronic device through the wireless charging coil, the third signal being used to request the second electronic device to generate an alternating electromagnetic field with an alternating current signal at a third predetermined frequency, the third predetermined frequency being higher than the first predetermined frequency; the processor responds to the third signal and instructs the charging management module to transmit an alternating current signal with a third preset frequency to the wireless charging coil; the charging management module converts a direct current signal from the battery into an alternating current signal with a third preset frequency according to the instruction of the processor, and transmits the alternating current signal with the third preset frequency to the wireless charging coil; the wireless charging coil responds to an alternating current signal with a third preset frequency to generate a third alternating electromagnetic field, and the third alternating electromagnetic field acts on a magnetic shielding material of the first electronic device to generate second heat for increasing the battery core temperature of the first electronic device.

In an eighth aspect, the present application provides a chip system applied to an electronic device including a battery, a charging control module, a wireless charging coil, a charging interface, and a memory. The system-on-chip includes one or more interface circuits and one or more processors. The interface circuit and the processor are interconnected by a line. The interface circuit is configured to receive signals from the memory and to send signals to the processor, the signals including computer instructions stored in the memory. When the computer instruction is executed by a processor, the processor is specifically configured to perform the following operations when the computer instruction is executed by the processor:

the processor is configured to periodically detect a cell temperature of the battery if it is detected that the charging interface inputs the direct current signal; and if the battery core temperature is lower than the first temperature threshold value, sending a first signal to the wireless charging control module. The first signal is used for instructing the wireless charging control module to transmit an alternating current signal of a first preset frequency to the wireless charging coil, so that the wireless charging coil generates a first alternating electromagnetic field in response to the alternating current signal of the first preset frequency; the first preset frequency is higher than the second preset frequency, and the second preset frequency is the frequency of an alternating current signal for wireless charging of the electronic equipment.

The processor is further configured to send a second signal to the charging control module if it is determined that the cell temperature is higher than the first temperature threshold; the second signal is used for indicating the charging control module to receive the direct current electrical signal input by the charging interface and indicating the charging control module to charge the battery by using the direct current electrical signal input by the charging interface.

It should be noted that, when the processor executes the computer instruction, the processor in the chip system may execute the method steps executed by the processor of the electronic device in the fifth aspect and any possible design manner thereof, which is not described herein again.

In a ninth aspect, the present application provides a chip system, which is applied to an electronic device including a battery, a charging management module, a wireless charging coil, a charging interface, and a memory. The electronic device is a first electronic device. The system-on-chip includes one or more interface circuits and one or more processors. The interface circuit and the processor are interconnected by a line. The interface circuit is configured to receive signals from the memory and to transmit the received signals to the processor, the signals including computer instructions stored in the memory. When the processor executes the computer instructions, the processor is specifically configured to perform the following operations:

the processor is used for periodically detecting the cell temperature of the battery after wireless charging protocol interaction is carried out between the wireless charging coil and the second electronic equipment, and the second electronic equipment is used for wirelessly charging the first electronic equipment.

The processor is further configured to send a first signal to the second electronic device through the wireless charging coil if it is determined that the cell temperature is lower than the first temperature threshold. The first signal is used for requesting the second electronic device to generate a first alternating electromagnetic field by using an alternating current signal with a first preset frequency, the first preset frequency is higher than a second preset frequency, the second preset frequency is the frequency of the alternating current signal for wireless charging of the first electronic device, and the magnetic shielding material is induced by the first alternating electromagnetic field to generate first heat for increasing the temperature of the battery core.

The processor is further configured to determine that the cell temperature is higher than or equal to a first temperature threshold, send a second signal to the second electronic device through the wireless charging coil, where the second signal is used to request the second electronic device to generate a second alternating electromagnetic field with an alternating current signal at a second preset frequency. The second alternating electromagnetic field acts on the wireless charging coil, so that the wireless charging coil generates an alternating current signal, and the alternating current signal is used for charging the battery through the charging management module.

It should be noted that, when the processor executes the computer instruction, the processor in the chip system may execute the method steps executed by the processor of the electronic device in the sixth aspect and any possible design manner thereof, which is not described herein again.

In a tenth aspect, the present application provides a chip system, which is applied to an electronic device including a battery, a charging management module, a wireless charging coil, and a memory. The electronic device is a second electronic device. The system-on-chip includes one or more interface circuits and one or more processors. The interface circuit and the processor are interconnected by a line. The interface circuit is configured to receive signals from the memory and to send signals to the processor, the signals including computer instructions stored in the memory. When the processor executes the computer instructions, the processor is specifically configured to perform the following operations:

the processor is used for receiving a first signal from the first electronic device after wireless charging protocol interaction with the first electronic device through the wireless charging coil. The first signal is used for requesting the second electronic device to generate an alternating electromagnetic field by using an alternating current signal with a first preset frequency, wherein the first preset frequency is higher than a second preset frequency, and the second preset frequency is the frequency of the alternating current signal for wirelessly charging the electronic device.

The processor is further configured to instruct the charging management module to transmit an alternating current signal with a first preset frequency to the wireless charging coil in response to the first signal. The alternating current signal with the first preset frequency acts on the wireless charging coil to generate a first alternating electromagnetic field, and the first alternating electromagnetic field acts on the magnetic shielding material of the first electronic device to generate first heat for increasing the temperature of the battery core of the first electronic device.

The processor is further configured to receive a second signal from the first electronic device through the wireless charging coil. The second signal is used for requesting the second electronic device to generate an alternating electromagnetic field with an alternating current electric signal of a second preset frequency.

The processor is further configured to instruct the charging management module to transmit an alternating current signal with a second preset frequency to the wireless charging coil in response to the second signal. The alternating current signal with the second preset frequency acts on the wireless charging coil to generate a second alternating electromagnetic field, and the second alternating electromagnetic field acts on the wireless charging coil of the first electronic device and is used for charging the first electronic device.

It should be noted that, when the processor executes the computer instruction, the processor in the chip system may execute the method steps executed by the processor of the electronic device in the seventh aspect and any possible design manner thereof, which is not described herein again.

In an eleventh aspect, the present application provides a computer-readable storage medium comprising computer instructions. The computer instructions, when executed on an electronic device, cause the electronic device to perform the method of the fifth, sixth, or seventh aspect, or any of its possible designs.

In a twelfth aspect, the present application provides a computer program product for, when run on a computer, causing the computer to perform the method according to the fifth, sixth or seventh aspect and any possible design thereof.

It should be understood that the advantageous effects achieved by the chip systems according to the above-mentioned eighth to tenth aspects, the computer-readable storage medium according to the eleventh aspect, and the computer program product according to the twelfth aspect can refer to the advantageous effects in the first aspect, the second aspect, or the third aspect and any possible design manner thereof, and are not repeated herein.

Drawings

FIG. 1 is a schematic diagram of a conventional mobile phone;

fig. 2 is a schematic circuit diagram of a mobile phone supporting wired charging, forward wireless charging and reverse wireless charging according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of components of a mobile phone according to an embodiment of the present disclosure;

fig. 4 is a schematic hardware structure diagram of an electronic device according to an embodiment of the present disclosure;

fig. 5 is a flowchart of a charging method according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of a cell temperature distribution of a battery provided in an embodiment of the present application;

fig. 7 is a flowchart of another charging method provided in the present embodiment;

fig. 8 is a flowchart of another charging method provided in the present embodiment;

fig. 9 is a schematic diagram illustrating an attenuation curve of a step signal according to an embodiment of the present application;

fig. 10 is a flowchart of another charging method provided in the present embodiment;

fig. 11 is a schematic diagram of a cell temperature distribution of another battery provided in an embodiment of the present application;

fig. 12 is a schematic diagram of a cell temperature distribution of another battery provided in an embodiment of the present application;

fig. 13A is a schematic diagram of a wireless charging system according to an embodiment of the present disclosure;

fig. 13B is a schematic structural diagram of a second electronic device according to an embodiment of the present application;

fig. 14 is a flowchart of another charging method provided in the present embodiment;

fig. 15 is a schematic diagram of a cell temperature distribution of another battery provided in this embodiment of the present application;

fig. 16 is a flowchart of another charging method provided in an embodiment of the present application;

fig. 17 is a schematic structural diagram of a chip system according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; the specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The embodiment of the application provides a charging method which can be applied to a wired charging process or a wireless charging process of electronic equipment. That is to say, in the wired charging process of the electronic device or the forward wireless charging process of the electronic device, the method according to the embodiment of the present application can be used to preheat the battery cell of the electronic device, so as to ensure the low-temperature charging safety of the electronic device.

In the embodiment of the present application, "the electronic device supports wired charging" means: the charging interface of the electronic device can be connected with a wired charger (also called a power adapter) and receives charging input of the wired charger. For example, the charging interface may be a Universal Serial Bus (USB) interface. The wireless charging of the electronic device may include forward wireless charging and reverse wireless charging. The phrase "the electronic device supports forward wireless charging" refers to: a wireless charging coil of an electronic device may receive a wireless charging input. The phrase "the electronic device supports reverse wireless charging" means that: the wireless charging coil of the electronic equipment can emit a wireless charging signal to wirelessly charge other equipment.

In a first application scenario, the electronic device in the embodiment of the present application may be an electronic device supporting wired charging, forward wireless charging, and reverse wireless charging. In this application scenario, the method may be applied to a wired charging process of an electronic device.

In a second application scenario, the electronic device in the embodiment of the present application may be an electronic device supporting wired charging and forward wireless charging. In this application scenario, the method may be applied to a forward wireless charging process of an electronic device.

In a third application scenario, the electronic device in the embodiment of the present application may be an electronic device supporting wired charging, forward wireless charging, and reverse wireless charging. In this application scenario, the method may be applied to a reverse wireless charging process of an electronic device.

For example, the electronic device in the embodiment of the present application may be a mobile phone, a wearable device (such as a smart watch), a tablet computer, a desktop, a laptop, a handheld computer, a notebook, an ultra-mobile personal computer (UMPC), a netbook, a cellular phone, a Personal Digital Assistant (PDA), an Augmented Reality (AR) \ Virtual Reality (VR) device, or the like, which has the above functions.

For convenience of understanding, in the embodiments of the present application, a mobile phone is taken as an example to illustrate principles of wired charging and wireless charging of an electronic device in a conventional scheme, in conjunction with the accompanying drawings.

Please refer to fig. 2, which illustrates a schematic circuit diagram of a mobile phone 200 supporting wired charging, forward wireless charging and reverse wireless charging according to an embodiment of the present application. As shown in fig. 2, the cellular phone 200 includes: processor 210, battery 220, charging control module 230, wireless charging control module 240, matching circuit 250, wireless charging coil 260, and charging interface 270.

(1) The wired charging principle of the handset 200.

Processor 210 is connected to charging interface 270, and is configured to detect whether there is a charging input (i.e., a wired charging input) on charging interface 270. It is appreciated that processor 210 may detect a charging input at charging interface 270 when power adapter 280 (i.e., a wired charger) coupled to a power source is coupled to charging interface 270. At this time, the processor 210 may communicate with the charging control module 230 to perform parameter configuration on the charging control module 230, so that the charging control module 230 charges the battery 220 according to the parameter configuration. Specifically, the charging control module 230 is connected to the charging interface 270, and is configured to receive a charging input from the power adapter 280 through the charging interface 270 to charge the battery 220. For example, the charging interface 270 may be a USB interface.

It should be noted that the processor 210 may also detect whether there is a charging input through the charging control module 230. The specific detection method may use the prior art, and is not described herein again.

(2) The forward wireless charging principle of the handset 200.

The wireless charging coil 260 may be coupled to a wireless charging coil of a wireless charger of the mobile phone 200 to induce an alternating electromagnetic field emitted from the wireless charging coil of the wireless charger to generate an alternating electrical signal. The wireless charger may be a wireless charging base of the mobile phone 200 or other electronic devices capable of wirelessly charging the mobile phone 200. The matching circuit 250 may include a combination of capacitors to form an LC resonance with the wireless charging coil 260 to improve the reception efficiency of the wireless charging coil 260. The matching circuit 250 is connected to the wireless charging control module 240, and is configured to input an alternating electrical signal to the wireless charging control module 240. The wireless charging control module 240 is connected to the charging control module 230, and is configured to rectify the alternating current signal into a direct current signal and input the direct current signal to the charging control module 230. The charging control module 230 may charge the battery 220 according to the dc signal.

(3) The reverse wireless charging principle of the handset 200.

After the reverse wireless charging function of the mobile phone 200 is turned on, the charging control module 230 may receive the input of the battery 220 and input a dc signal to the wireless charging control module 240. The wireless charging control module 240 may convert the direct current signal into an alternating electrical signal and then input the alternating electrical signal to the coil 260 through the matching circuit 250. The coil 260 may generate an alternating electromagnetic field in response to the alternating electrical signal. The wireless charging coil of other electronic devices (e.g., a smart watch) is coupled to the wireless charging coil 260, and induces the alternating electromagnetic field emitted by the wireless charging coil 260, which may generate an alternating electrical signal. Thus, reverse wireless charging of the mobile phone 200 can be achieved.

For example, the Wireless charging technology (Wireless charging technology) may comply with any standard, such as the Qi standard, the (Power materials Alliance, PMA) standard, or the (Alliance for Wireless Power, A4 WP) standard. For example, in the embodiment of the present application, the wireless charging of the electronic device follows the Qi standard described above. Electronic products of different brands and different models can be wirelessly charged through a Qi standard wireless charging technology as long as one Qi identifier is provided.

The Qi standard specifies that the frequency of the alternating electrical signal is within a certain frequency range when the electronic device is wirelessly charged (including forward wireless charging or reverse wireless charging). For example, the Qi standard may specify that the frequency of the alternating electrical signal is between 100 kilohertz (KHz) and 205KHz when the electronic device is wirelessly charged. That is to say, in the embodiment of the present application, when the electronic device performs wireless charging (including forward wireless charging and reverse wireless charging), the frequency of the alternating electrical signal (i.e. the second preset frequency in the following embodiments, i.e. preset frequency 2) is between 100KHz and 205 KHz.

It is understood that during wireless charging (e.g., forward wireless charging or reverse wireless charging) of an electronic device, an alternating electromagnetic field is generated or induced by the wireless charging coil. The battery of the electronic device comprises some devices which may affect the alternating electromagnetic field, causing a certain loss of the magnetic field strength of the alternating electromagnetic field. Furthermore, the alternating electromagnetic field generated by the wireless charging coil may also affect the battery, shortening the life of the battery.

In order to reduce the loss of the magnetic field strength of the alternating electromagnetic field and protect the battery, a magnetic shielding material may be disposed between the wireless charging coil 260 and the battery 220, as shown in fig. 3. Alternatively, the wireless charging coil 260 can be a wireless charging coil (e.g., a flat spiral coil) with a magnetic shielding material disposed between the battery 220 and the wireless charging coil 260. For example, the magnetic shielding material may be a material such as a nanocrystal, an amorphous, or a ferrite. Of course, the magnetic shield material includes, but is not limited to, the above materials. As shown in fig. 3, the battery, magnetic shielding material and wireless charging coil 260 of the mobile phone 200 are all disposed in the cavity formed by the front and rear shells of the mobile phone.

It should be noted that a magnetic shielding material is generally disposed between a battery and a wireless charging coil of an electronic device (such as the mobile phone 200) supporting wireless charging.

It can be understood that, in the above-mentioned forward wireless charging or reverse wireless charging process, the alternating electromagnetic field generates hysteresis loss and eddy current loss on the magnetic shielding material of the mobile phone, and thus heat is generated. The larger the frequency of the alternating electric signal is, the more heat is generated by hysteresis loss and eddy current loss of the alternating electromagnetic field on the magnetic shielding material. In addition, during the forward wireless charging or the reverse wireless charging, the wireless charging coil 260 of the mobile phone 200 generates heat. Wherein, the magnetic shielding material and the wireless charging coil 260 cover the surface of the battery cell. Therefore, in the embodiment of the present application, when the mobile phone is charged wirelessly in the forward direction or wirelessly in the reverse direction, the battery core is preheated by using the heat generated by the magnetic shielding material and the coil, so as to realize the safe charging of the mobile phone 200 in the low-temperature environment.

Specifically, in the first application scenario (i.e., the wired charging process of the electronic device), before the battery 220 of the mobile phone 200 is charged in a wired manner, the processor 210 may detect the cell temperature of the battery 220. If the cell temperature is less than the preset safe temperature, the processor 210 may configure the wireless charging control module 240 to drive the wireless charging coil 260 at a first preset frequency (i.e., a preset frequency 1) to generate an alternating electromagnetic field. Specifically, the processor 210 may configure the wireless charging control module 240 to convert the dc signal into an ac signal, and input an ac signal with a first preset frequency to the wireless charging coil 260, so as to simulate a reverse wireless charging process of the mobile phone 200. Thus, the magnetic shielding material and the wireless charging coil 260 can generate heat, and the cell is preheated before the wired charging of the battery 220, so that the safe charging of the mobile phone 200 can be realized in a low-temperature environment.

It should be noted that, in order to distinguish the wireless charging during cell preheating from the ordinary wireless charging (including forward wireless charging and reverse wireless charging) in the embodiment of the present application, the cell preheating is quickly implemented; the second predetermined frequency is different from the first predetermined frequency. Specifically, the first predetermined frequency (i.e., the predetermined frequency 1) is much greater than the second predetermined frequency (i.e., the predetermined frequency 2). For example, the first predetermined frequency may range from m KHz to n megahertz (MHz). Wherein m is larger than 205, n can be any value of 1,1.5 or 2, and the like.

In a second application scenario (i.e., a forward wireless charging process of an electronic device), before the mobile phone 200 is wirelessly charged in a forward direction, the processor 210 may perform wireless charging protocol interaction with a wireless charger of the mobile phone 200 through a wireless charging coil, and after the wireless charging protocol interaction is completed, the processor 210 may detect a cell temperature of the battery 220. If the battery core temperature is lower than the safety charging temperature, the processor 210 may instruct the wireless charger of the mobile phone 200 to output an alternating electromagnetic field corresponding to an alternating electrical signal with a first preset frequency. Thus, the wireless charging coil 260 can induce the alternating electromagnetic field emitted by the wireless charger of the mobile phone 200. The magnetic shielding material and the wireless charging coil 260 may generate heat, and the cell is preheated before the battery 220 is wirelessly charged in the forward direction, so as to realize the safe charging of the mobile phone 200 in a low temperature environment.

In a third application scenario (i.e., a reverse wireless charging process of the electronic device), before the mobile phone 200 performs reverse wireless charging for other devices (e.g., the smart watch), the smart watch may perform wireless charging protocol interaction with the mobile phone 200, and after the wireless charging protocol interaction is completed, the smart watch may detect a cell core temperature of a battery of the smart watch. If the cell temperature is less than the safety charging temperature, the smart watch may request the cell phone 200 to preheat the smart watch cell. In response to a request by the smart watch, the processor 210 may configure the wireless charging control module 240 to drive the wireless charging coil 260 at a first preset frequency (i.e., preset frequency 1) to generate an alternating electromagnetic field. Thus, the wireless charging coil of the smart watch can induce the alternating electromagnetic field emitted by the wireless charging coil 260 of the mobile phone 200. The magnetism shielding material and the wireless charging coil of intelligence wrist-watch alright in order to produce the heat, carry out electric core for the battery of intelligence wrist-watch and preheat to realize the safety of intelligence wrist-watch under low temperature environment and charge.

In the three application scenes, no element is added in the existing electronic equipment, so that the electronic equipment can be safely charged in a low-temperature environment. That is to say, through the scheme of this application embodiment, under low temperature environment, can carry out the electricity core for electronic equipment's battery and preheat based on the components and parts (such as wireless charging coil and magnetic shielding material etc.) of current electronic equipment itself, realize electronic equipment's safe charging.

Please refer to fig. 4, which is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. As shown in fig. 4, the electronic device 400 may include a processor 410, an external memory interface 420, an internal memory 421, a Universal Serial Bus (USB) interface 430, a charging management module 440, a battery 441, a wireless charging coil 442, a matching circuit 443, an antenna 1, an antenna 2, a mobile communication module 450, a wireless communication module 460, an audio module 470, a speaker 470A, a receiver 470B, a microphone 470C, a headset interface 470D, a sensor module 480, keys 490, a motor 491, an indicator 492, a camera 493, a display screen 494, a Subscriber Identity Module (SIM) card interface 495, and the like.

Among them, the sensor module 480 may include a pressure sensor, a gyroscope sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, a bone conduction sensor, etc. In some embodiments, the sensor module 480 may also include a SAR sensor 481. The SAR sensor 481 is used for foreign matter detection. The foreign object detection is to detect whether there is a metal object around the electronic device 400.

The electronic device 400 shown in fig. 4 may be the cell phone 200 shown in fig. 2. When the electronic device 400 is the mobile phone 200, the processor 410 shown in fig. 4 is the processor 210 of the mobile phone 200, the battery 441 is the battery 220 of the mobile phone 200, the charging management module 440 includes the charging control module 230 and the wireless charging control module 240 of the mobile phone 200 (i.e., the functions of the charging control module 230 and the wireless charging control module 240 can be integrated in the charging management module 440), the wireless charging coil 442 is the wireless charging coil 260 of the mobile phone 200, the matching circuit 443 is the matching circuit 250 of the mobile phone 200, and the usb interface 430 is the charging interface 270 of the mobile phone 200.

It is to be understood that the illustrated structure of the embodiment of the invention is not to be construed as a specific limitation to the electronic device 400. In other embodiments of the present application, the electronic device 400 may include more or fewer components than illustrated, or combine certain components, or split certain components, or arrange different components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Processor 410 may include one or more processing units, such as: the processor 410 may include an Application Processor (AP), a modem processor, a Graphics Processor (GPU), an Image Signal Processor (ISP), a controller, a memory, a video codec, a Digital Signal Processor (DSP), a baseband processor or a neural Network Processor (NPU), and the like. The different processing units may be separate devices or may be integrated into one or more processors. For example, in the embodiment of the present application, the processor 410 (i.e., the processor 210 shown in fig. 2) may be an application processor AP.

The controller may be, among other things, a neural center and a command center of the electronic device 400. The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in processor 410 for storing instructions and data. In some embodiments, the memory in the processor 410 is a cache memory. The memory may hold instructions or data that have just been used or recycled by the processor 410. If the processor 410 needs to use the instruction or data again, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 410, thereby increasing the efficiency of the system.

In some embodiments, processor 410 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (I2S) interface, a Pulse Code Modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a general-purpose input/output (GPIO) interface, a Subscriber Identity Module (SIM) interface, or a Universal Serial Bus (USB) interface.

The USB interface 430 is an interface conforming to the USB standard specification, and may specifically be a Mini USB interface, a Micro USB interface, a USB Type C interface, or the like. The USB interface 430 may be used to connect a charger (e.g., the voltage adapter 280 shown in fig. 2) to charge the electronic device 400, and may also be used to transmit data between the electronic device 400 and a peripheral device. And the earphone can also be used for connecting an earphone and playing audio through the earphone. The interface may also be used to connect other electronic devices, such as AR devices and the like.

It should be understood that the connection relationship between the modules according to the embodiment of the present invention is only illustrative and is not limited to the structure of the electronic device 400. In other embodiments of the present application, the electronic device 400 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.

The charging management module 440 is configured to receive charging input from a charger. The charger may be a wireless charger (e.g., a wireless charging cradle of the electronic device 400 or other devices that can wirelessly charge the electronic device 400), or may be a wired charger (e.g., the voltage adapter 280 shown in fig. 2).

In some embodiments, electronic device 400 may support wired charging. Specifically, the charging management module 440 may receive a charging input of the wired charger through the USB interface 430.

In other embodiments, electronic device 400 may support forward wireless charging. The charging management module 440 may receive a wireless charging input through a wireless charging coil 442 of the electronic device. Specifically, the charging management module 440 is connected to the wireless charging coil 442 via the matching circuit 443. Wireless charging coil 442 may be coupled to the wireless charging coil of the wireless charger to induce an alternating electromagnetic field emitted by the wireless charging coil of the wireless charger to produce an alternating electrical signal. The alternating electrical signal generated by the wireless charging coil 442 is transmitted to the charging management module 440 via the matching circuit 443 to wirelessly charge the battery 441.

The charging management module 440 may also supply power to the electronic device while charging the battery 441. The charging management module 440 receives input from the battery 441 and supplies power to the processor 410, the internal memory 421, the external memory, the display screen 494, the camera 493, the wireless communication module 460, and the like. The charge management module 440 may also be used to monitor parameters such as battery capacity, battery cycle number, and battery state of health (leakage, impedance) of the battery 441. In some other embodiments, the charging management module 440 may also be disposed in the processor 410.

In other embodiments, electronic device 400 may support reverse wireless charging. Specifically, the charging management module 440 may further receive an input of the battery 441, and convert a dc signal input by the battery 441 into an ac signal. The ac power signal is transmitted to the wireless charging coil 442 through the matching circuit 443. The alternating current signal received by wireless charging coil 442 may generate an alternating electromagnetic field. The wireless charging coil of other electronic equipment induces the alternating electromagnetic field, and wireless charging can be carried out. That is, the electronic device 400 may also wirelessly charge other electronic devices.

The wireless charging coil 442 is a wireless charging coil with a magnetic shielding material. Alternatively, a magnetic shielding material is disposed between the wireless charging coil 442 and the battery 441 of the electronic device 400. In general, the magnetic shield material serves to reduce loss of the magnetic field strength of the alternating electromagnetic field and protect the battery 441. In the embodiment of the present application, when the electronic device 400 is used for wireless charging (including forward wireless charging and reverse wireless charging), the alternating electromagnetic field generates hysteresis loss and eddy current loss on the magnetic shielding material to generate heat, so as to preheat the battery core of the battery 441. For example, the magnetic shielding material may be a material such as a nanocrystal, amorphous, ferrite, or the like. Of course, the magnetic shield material includes, but is not limited to, the above materials.

The electronic device 400 performs the detailed description of the wired charging, the forward wireless charging, and the reverse wireless charging, which can refer to the introduction of the wired charging, the forward wireless charging, and the reverse wireless charging principle of the mobile phone 200 in the above example, and the description of the embodiment of the present application is omitted here.

The wireless communication function of the electronic device 400 may be implemented by the antenna 1, the antenna 2, the mobile communication module 450, the wireless communication module 460, the modem processor, the baseband processor, and the like.

The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in electronic device 400 may be used to cover a single or multiple communication bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed as a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 450 may provide a solution including 2G/3G/4G/5G wireless communication applied on the electronic device 400. The wireless communication module 460 may provide a solution for wireless communication applied to the electronic device 400, including Wireless Local Area Networks (WLANs) (e.g., wireless fidelity (Wi-Fi) networks), bluetooth (bluetooth, BT), global Navigation Satellite System (GNSS), frequency Modulation (FM), near Field Communication (NFC), infrared (IR), and the like. In some embodiments, antenna 1 of electronic device 400 is coupled to mobile communication module 450 and antenna 2 is coupled to wireless communication module 460, such that electronic device 400 may communicate with networks and other devices via wireless communication techniques.

The electronic device 400 implements display functionality via the GPU, the display screen 494, and the application processor, among other things. The GPU is an image processing microprocessor that is coupled to a display screen 494 and an application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 410 may include one or more GPUs that execute program instructions to generate or alter display information.

The display screen 494 is used to display images, videos, and the like. The display screen 494 includes a display panel. In some embodiments, the electronic device 400 may include 1 or N display screens 494, N being a positive integer greater than 1.

The electronic device 400 may implement a shooting function through the ISP, the camera 493, the video codec, the GPU, the display screen 494, the application processor, and the like. The ISP is used to process the data fed back by the camera 493. In some embodiments, the ISP may be provided in camera 493. The camera 493 is used to capture still images or video. In some embodiments, the electronic device 400 may include 1 or N cameras 493, N being a positive integer greater than 1.

The external memory interface 420 may be used to connect an external memory card, such as a Micro SD card, to extend the memory capability of the electronic device 400. The external memory card communicates with the processor 410 through the external memory interface 420 to implement data storage functions. For example, files such as music, video, etc. are saved in an external memory card.

The internal memory 421 may be used to store computer-executable program code, including instructions. The processor 410 executes various functional applications of the electronic device 400 and data processing by executing instructions stored in the internal memory 421. In addition, the internal memory 421 may include a high-speed random access memory, and may further include a nonvolatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (UFS), and the like.

Electronic device 400 may implement audio functions via audio module 470, speaker 470A, microphone 470B, earphone interface 470C, and application processor, among others. Such as music playing, recording, etc.

The audio module 470 is used to convert digital audio information into analog audio signal output and also used to convert analog audio input into digital audio signal. In some embodiments, the audio module 470 may be disposed in the processor 410, or some functional modules of the audio module 470 may be disposed in the processor 410. The speaker 470A, also called a "horn", is used to convert the audio electrical signals into sound signals. The receiver 470B, also called "earpiece", is used to convert the electrical audio signal into an acoustic signal. The microphone 470C, also referred to as a "microphone," is used to convert sound signals into electrical signals. The electronic device 400 may be provided with at least one microphone 470C. The earphone interface 470D is used to connect a wired earphone. The headset interface 470D may be the USB interface 430, or may be a 3.5mm open mobile electronic device platform (OMTP) standard interface, a cellular telecommunications industry association (cellular telecommunications industry association of the USA, CTIA) standard interface.

The keys 490 include a power-on key, a volume key, etc. The keys 490 may be mechanical keys. Or may be touch keys. The electronic device 400 may receive a key input, and generate a key signal input related to user setting and function control of the electronic device 400. The motor 491 may generate a vibration indication. The motor 491 may be used for both incoming call vibration prompting and touch vibration feedback. The indicator 492 may be an indicator light, and may be used to indicate a charging status, a change in charge level, or a message, a missed call, a notification, etc. The SIM card interface 495 is used to connect a SIM card. The SIM card can be attached to and detached from the electronic apparatus 400 by being inserted into the SIM card interface 495 or being pulled out from the SIM card interface 495. The electronic device 400 may support 1 or N SIM card interfaces, N being a positive integer greater than 1. The SIM card interface 195 may support a Nano SIM card, a Micro SIM card, a SIM card, etc. In some embodiments, the electronic device 400 employs esims, namely: an embedded SIM card. The eSIM card can be embedded in the electronic device 400 and cannot be separated from the electronic device 400.

The embodiment of the application provides a charging method which can be applied to electronic equipment. In a first application scenario (i.e., a wired charging scenario for an electronic device), the electronic device supports wired charging, forward wireless charging, and reverse wireless charging. The electronic device may include: the device comprises a processor, a battery, a charging control module, a charging interface, a wireless charging control module, a matching circuit and a wireless charging coil. The wireless charging coil is covered with a magnetic shielding material. Or a magnetic shielding material is arranged between the wireless charging coil and the battery.

For example, in the embodiment of the present application, taking the electronic device as the mobile phone 200 shown in fig. 2 as an example, in a wired charging scenario of the electronic device, the method of the embodiment of the present application is described. As shown in fig. 2, the cellular phone 200 includes: processor 210, battery 220, charging control module 230, charging interface 270, wireless charging control module 240, matching circuit 250, and wireless charging coil 260. The wireless charging coil 260 is provided with a magnetic shielding material. Alternatively, a magnetic shielding material is disposed between the wireless charging coil 260 and the battery 220.

The embodiment of the application provides a charging method. In a first application scenario (i.e., a wired charging scenario of an electronic device), as shown in fig. 5, the method may include S501-S511.

S501, processor 210 detects that charging interface 270 inputs a dc signal.

Generally, charging interface 270 may include a power line, a data line (also referred to as a signal line), and a ground line. For example, charging interface 270 is a USB interface. The USB interface may include four wires: a power positive line (e.g., a red line), a positive voltage data line (e.g., a white line), a negative voltage data line (e.g., a green line), and a ground line (e.g., a black line).

Wherein, the power line of the charging interface 270 is connected to the charging control module 230 and the wireless charging control module 240, and the data line of the charging interface 270 is connected to the processor 210. Thus, when charging interface 270 inputs a dc signal (i.e., there is a charging input), processor 210 may detect the dc signal (i.e., the charging input).

In this embodiment, when the power adapter 280 of the mobile phone 200 is connected to the power supply and the charging interface 270, the power adapter may input a dc signal to the charging interface 270. Specifically, after the power adapter 280 is connected to the power source and the charging interface 270, the high-voltage ac power (e.g., 220V ac power) from the power source can be converted into low-voltage dc power (e.g., 5V dc power). The power adapter 280 inputs a dc signal, such as a 5V dc signal, to the mobile phone 200 through the charging interface 270. After the dc signal is input into the mobile phone 200 through the charging interface 270, the processor 210 may control the direction of the dc signal.

Generally, after the dc signal is inputted into the mobile phone 200 through the charging interface 270, the processor 210 may directly configure the charging control module 230 to receive the dc signal and then charge the battery 220 according to the dc signal. For example, after S501, the handset 200 may directly perform S509-S510. In the embodiment of the present application, in order to ensure charging safety, the core temperature of the battery 220 may be detected first; the battery 220 is charged only when the cell temperature is higher than a preset safe temperature (i.e., the first temperature threshold).

S502, the processor 210 periodically detects the cell temperature of the battery 220.

For example, the cycle duration of the processor 210 periodically detecting the cell temperature may be preset and configured in the mobile phone 200; alternatively, the period duration may be set by the user in the handset 200. For example, the cycle time may be any time length such as 3 seconds(s), 5s,1s, or 8 s.

The battery 220 includes a Negative Temperature Coefficient (NTC) thermistor therein. The resistance value of the NTC thermistor varies with temperature. Specifically, the higher the temperature is, the smaller the resistance value of the NTC thermistor is; the lower the temperature, the larger the resistance value of the NTC thermistor.

Also included in the electronic device 400 is a common resistor in series with the NTC thermistor described above. The resistance value of the ordinary resistor does not change with the change of temperature. In which the battery 220 provides a fixed voltage value (e.g., 2.5 or 1.8V) for the voltage values of the NTC thermistor and the common resistor connected in series.

In this embodiment, the processor 210 may detect the cell temperature of the battery 220 by measuring the voltage values at two ends of the NTC thermistor. The greater the voltage value at the two ends of the NTC thermistor is, the lower the cell temperature of the battery 220 is; the smaller the voltage value across the NTC thermistor is, the higher the cell temperature of the battery 220 is.

It can be understood that, on the premise that a fixed voltage value (e.g. 2.5 or 1.8V) is provided for the voltage values of the NTC thermistor and the common resistor connected in series, and the resistance value of the common resistor is fixed, the larger the voltage value at the two ends of the NTC thermistor is, the larger the resistance value of the NTC thermistor is represented; the smaller the voltage value across the NTC thermistor, the smaller the resistance value of the NTC thermistor. Moreover, the higher the temperature is, the smaller the resistance value of the NTC thermistor is; the lower the temperature is, the larger the resistance value of the NTC thermistor is; thus, it can be derived: the greater the voltage value at both ends of the NTC thermistor is, the lower the cell temperature of the battery 220 is, and the smaller the voltage value at both ends of the NTC thermistor is, the higher the cell temperature of the battery 220 is.

In this embodiment, the processor 210 or the memory of the mobile phone 200 may store a plurality of voltage values of the NTC thermistor and a battery core temperature corresponding to each voltage value. A plurality of voltage values of the NTC thermistor and a cell temperature corresponding to each voltage value may be configured in the mobile phone 200 in advance. The cell temperature corresponding to each voltage value may be obtained through a large number of tests before the mobile phone 200 leaves a factory. Specifically, the processor 210 may measure a voltage value across the NTC thermistor, and query a cell temperature corresponding to the voltage value.

In other embodiments, the processor 210 may also detect the cell temperature of the battery 220 by measuring the voltage across the above-mentioned common resistor. In combination with the above description: the smaller the voltage value at the two ends of the common resistor is, the lower the cell temperature of the battery 220 is; the larger the voltage value across the common resistor, the higher the cell temperature of the battery 220.

In this embodiment, the processor 210 or the memory of the mobile phone 200 may store a plurality of voltage values of the common resistor and a cell temperature corresponding to each voltage value. The cell temperature corresponding to each voltage value may be obtained through a large number of tests before the mobile phone 200 leaves a factory. Specifically, the processor 210 may measure a voltage value at two ends of the common resistor, and query the cell temperature corresponding to the voltage value.

It should be noted that, the method for detecting the cell temperature of the battery 220 by the processor 210 includes, but is not limited to, the above method, and any method for detecting the cell temperature of the battery 220 in the conventional technology may be applied to the embodiment of the present application for detecting the cell temperature of the battery 220, which is not limited by the embodiment of the present application.

S503, the processor 210 determines whether the cell temperature of the battery 220 is lower than a first temperature threshold.

The first temperature threshold (e.g., M1) may be a cell temperature required in a charging safety specification. For example, assume that the charging safety specifications require: when a battery of an electronic product is charged, the cell temperature of the battery must be more than 0 ℃. Then, the first temperature threshold may be 0 ℃.

In some embodiments, to more effectively protect the battery 220, the first temperature threshold may be higher than the cell temperature required in the charging safety specification. For example, assume that the cell temperature must be greater than 0 ℃ as required in the charging safety regulations; then, the first temperature threshold may be a temperature threshold greater than 0 ℃. Of course, in order to improve the charging experience of ensuring that the battery 220 is charged at a low temperature, the first temperature threshold value and the cell temperature required in the charging safety specification may not be too different. For example, the first temperature threshold (e.g., M1) may be 2 deg.C, 3 deg.C, or 5 deg.C, etc.

It is understood that if the cell temperature of battery 220 is below the first temperature threshold, it indicates that the cell temperature of battery 220 is low. At this time, if the battery 220 is directly charged, there may be a safety hazard and damage to the battery 220. In order to ensure the low-temperature charging safety of the mobile phone 200, in this embodiment of the application, before the battery 220 is charged, a cell of the battery 220 may be preheated. Specifically, if the cell temperature of the battery 220 is lower than the first temperature threshold, the mobile phone 200 may execute S504-S508 to perform cell preheating.

In the embodiment of the present application, the cell phone starts a cell preheating function (or referred to as an induction heating function), and after entering an induction heating mode, the cell phone can preheat the battery 220. That is, after S503, if the cell temperature of the battery 220 is lower than the first temperature threshold, the mobile phone may start the cell preheating function and enter the induction heating mode. In the induction heating mode, the respective devices in the mobile phone 200 may perform S504 to S508 to implement cell preheating.

If the cell temperature of battery 220 is greater than or equal to the first temperature threshold, it indicates that the cell temperature of battery 220 is high. At this time, if battery 220 is charged directly, there is a low possibility that there is a safety hazard and battery 220 is damaged. Therefore, if the cell temperature of the battery 220 is higher than or equal to the first temperature threshold, the battery 220 may be charged (i.e., S509-S510 is performed), and the cell preheating function of the battery 220 is not required to be turned on.

S504, the processor 210 sends a signal 1 to the wireless charging control module 240.

From the above description it follows that: after a dc signal (e.g., a 5V dc signal) from the power adapter 280 is inputted into the mobile phone 200 through the charging interface 270, the processor 210 may control the dc signal. In the case that the cell temperature of the battery 220 is lower than the first temperature threshold, the processor 210 may configure the wireless charging control module 240 to receive the above-mentioned direct current signal. The processor 210 may further configure the wireless charging control module 240 to drive the wireless charging coil 260 to perform reverse wireless charging with an alternating current signal with a preset frequency 1, so as to implement cell preheating.

The signal 1 (i.e., the first signal) is used for configuring the wireless charging control module 240 to receive the direct current signal from the charging interface 270, and drive the wireless charging coil 260 to generate an alternating electromagnetic field at a preset frequency 1 (i.e., a first preset frequency).

It should be noted that, when the wireless charging standard (for example, qi standard) specifies that the electronic device performs wireless charging (including forward wireless charging or reverse wireless charging), the frequency of the alternating electrical signal is within a certain frequency range. For example, the Qi standard specifies that when the electronic device is wirelessly charged, the frequency of the alternating electrical signal (referred to as a preset frequency 2) is between 100KHz and 205 KHz.

In the embodiment of the present application, in order to distinguish the wireless charging and the ordinary wireless charging (including the forward wireless charging and the reverse wireless charging) when the cell is preheated in the embodiment of the present application, and quickly realize the cell preheating, a value of the preset frequency 1 (i.e., the first preset frequency) is different from a frequency range of the preset frequency 2. For example, the first predetermined frequency may be in a range of m KHz to n MHz. Wherein m is larger than 205, n can be any value of 1,1.5 or 2, and the like.

That is, only when the wireless charging control module 240 drives the wireless charging coil 260 at the above-mentioned preset frequency 2 to generate the alternating electromagnetic field 2, the other electronic devices can be wirelessly charged through the alternating electromagnetic field 2. In the embodiment of the present application, the alternating electromagnetic field 1 generated by driving the wireless charging coil 260 with the preset frequency 1 cannot be induced by the wireless charging coils of other electronic devices, and cannot be wirelessly charged for other electronic devices. Thus, it can be avoided that the mobile phone 200 wirelessly charges other electronic devices when executing the method of the embodiment of the present application. Therefore, the problem that the mobile phone 200 may consume electric power for wirelessly charging other electronic devices in the cell preheating process can be avoided.

S505, the wireless charging control module 240 receives the signal 1.

S506, in response to the signal 1, the wireless charging control module 240 receives the dc signal input by the power adapter 280 through the charging interface 270.

The wireless charging control module 240 may convert the dc signal input by the charging interface 270 into an ac signal with a preset frequency 1; then, carrying out the operation; an ac signal of a preset frequency 1 is transmitted to the wireless charging coil 260. For example, after S506, the method of the embodiment of the present application further includes S507.

S507, the wireless charging control module 240 converts the dc signal input by the charging interface 270 into an ac signal with a preset frequency 1, and transmits the ac signal with the preset frequency 1 to the wireless charging coil 260 through the matching circuit 250.

For example, the predetermined frequency 1 may be 1MHz, and the current of the ac signal may be 1 a (a). That is, the wireless charging control module 240 may transmit a driving current having a frequency of 1MHz to the wireless charging coil 260.

S508, the wireless charging coil 260 generates an alternating electromagnetic field 1 in response to the alternating current signal of the preset frequency 1. The magnetic shielding material is induced in the alternating electromagnetic field 1 to generate first heat for increasing the temperature of the battery core.

Wherein, the wireless charging coil 260 is provided with a magnetic shielding material. Alternatively, a magnetic shielding material is disposed between the wireless charging coil 260 and the battery 220. The magnetic shielding material can generate a first heat amount by inducing the alternating electromagnetic field 1 (i.e., the first alternating electromagnetic field), and the first heat amount can be used for increasing the cell temperature. Specifically, the alternating electromagnetic field 1 generates hysteresis loss and eddy current loss in the magnetic shield material, thereby generating heat.

Further, the larger the frequency of the alternating electric signal is, the more heat is generated by the hysteresis loss and the eddy current loss of the alternating electromagnetic field generated in the magnetic shield material.

Specifically, the magnetic shield material is generally a soft magnetic material. For soft magnetic materials, the iron loss

The iron loss refers to power loss of a magnetic material caused by an alternating electromagnetic field. This power loss is expressed in the form of heat, referred to as iron loss for short. C _m X and Y are constants of soft magnetic material, B _m Is the magnetic induction of the alternating electromagnetic field, and f is the frequency of the alternating electromagnetic field. In general, the constant Y of a magnetic material is greater than 1. Such as a nanocrystalline material (i.e., one of the magnetic materials) has a constant Y approximately equal to 1.76. It can be seen from this that the iron loss P of the magnetic shield material increases with the frequency of the alternating electric signal _Loss Will be greatly increased, i.e. the heat generated by the magnetic shielding material will be largeThe amplitude increases.

Wherein, the magnetic shielding material covers the surface of the battery core of the battery. The heat generated by the magnetic shielding material can be used for preheating the battery cell and improving the temperature of the battery cell.

For example, in the embodiment of the present application, the effect of cell preheating performed by the mobile phone 200 is described by using simulation data. The wireless charging coil 260 is made of copper, and the magnetic shielding material is made of 1K107B iron-based nanocrystalline. The mobile phone is placed in a natural environment with the environment temperature of minus 5 ℃, and the battery core temperature of the battery of the mobile phone is also about minus 5 ℃. At this time, the mobile phone turns on a cell preheating function (also referred to as an induction heating function) so that the wireless charging control module thereof transmits a driving current with a frequency of 1MHz to the wireless charging coil to generate an alternating electromagnetic field (i.e., performs S506-S508). After a certain time (e.g., 1 minute), the cell temperature distribution of the mobile phone is shown in fig. 6. As shown in fig. 6, the cell temperature of the mobile phone may be 10.9787 ℃ at the highest, 2.9029 ℃ at the lowest, and about 7 ℃ at the average temperature (e.g. 7.389 ℃). As shown in fig. 6, by the method of the embodiment of the present application, the battery core temperature can be increased from-5 ℃ to an average temperature of about 7 ℃ by induction heating of the wireless charging coil, so that charging safety can be ensured.

Of course, the wireless charging coil 260 generates heat in the process of generating the alternating electromagnetic field 1 in response to the alternating current signal with the preset frequency 1, and the wireless charging coil 260 also generates heat. However, the amount of heat generated by the wireless charging coil 260 is negligible, as compared to the amount of heat generated by the magnetic shield material. For example, in combination with the above simulation data, it is found that the thermal power generated by the wireless charging coil of the mobile phone is 0.275 watt (W), and the thermal power generated by the magnetic shielding material is 3.54W.

The wireless charging coil 260 generates less heat than the magnetic shielding material, but can also be used to raise and maintain cell temperature. Wherein, the magnetic shielding material and the wireless charging coil 260 cover the surface of the battery cell of the battery 220. Therefore, in the embodiment of the present application, before the battery 220 is charged in a wired manner, the battery core is preheated by using the heat generated by the magnetic shielding material and the wireless charging coil during the reverse wireless charging, so that the mobile phone 200 is safely charged in a low temperature environment.

From S504 to S508, in the embodiment of the present application, an energy source for cell preheating may be provided by a direct current signal input by the charging interface 270. In other embodiments, the battery 220 may also provide an energy source for cell preheating. Specifically, S506 may be replaced with: in response to signal 1, the wireless charging control module 240 receives a direct current electrical signal from the battery 220. S507 may be replaced with: the wireless charging control module 240 converts the dc signal from the battery 220 into an ac signal of a preset frequency 1, and transmits the ac signal of the preset frequency 1 to the wireless charging coil 260 through the matching circuit 250. Specifically, the processor 210 may configure the charging control module 230 to receive a charging input of the battery 220 and output a dc signal to the wireless charging control module 240 according to the charging input of the battery 220; then, the wireless charging control module 240 may receive the dc signal from the charging control module 230, convert the dc signal into an ac signal of a preset frequency 1, and transmit the ac signal of the preset frequency 1 to the wireless charging coil 260 through the matching circuit 250.

It is understood that if the battery 220 provides the energy source for cell preheating; then, before charging the battery 220, the power of the battery 220 is consumed. Thus, during the process of charging the battery 220, the electric quantity of the battery 220 may decrease and then increase, which is likely to cause unnecessary misunderstanding by the user, and thus the user may misunderstand that the battery 220 fails. Further, the larger the number of charge and discharge of battery 220, the larger the loss of battery 220, which affects the service life of battery 220.

To sum up, in the embodiment of the present application, the direct current signal input by the charging interface 270 provides an energy source for preheating the battery core, so that a user can be prevented from mistakenly considering that the battery 220 has a fault, unnecessary loss of the battery 220 can be reduced, and the service life of the battery 220 is prolonged.

After S508, the cell temperature of the battery 220 may gradually increase. As described in S502, the processor 210 may periodically detect the cell temperature of the battery 220. Therefore, after S508, the cell temperature detected by the processor 210 may gradually increase with the passage of time. However, the cell temperature detected by the processor 210 may still be below the first temperature threshold; at this time, the mobile phone 200 may perform S504-S508 to continue to raise the cell temperature through reverse wireless charging. After a period of time, the cell temperature of battery 220 may be above the first temperature threshold. At this time, the cellular phone 200 may perform S509 to S510 to perform wired charging.

S509, the processor 210 sends a signal 2 to the charging control module 230.

The signal 2 is used to configure the charging control module 230 to receive the dc power signal from the charging interface 270, and then charge the battery 220 according to the dc power signal.

S510, the charging control module 230 receives the signal 2, receives a dc electrical signal input by the power adapter 280 through the charging interface 270 in response to the signal 2, and charges the battery 220 with the dc electrical signal.

Wherein the signal 2 is a second signal. It should be noted that, the specific method for charging the battery 220 by the charging control module 230 according to the dc signal may refer to a method for charging the battery 220 according to an instruction dc signal input by a power adapter, such as a charging control module or a charging management module in the conventional technology, which is not described herein again in this embodiment of the present application.

It is to be understood that after S504 is executed by the processor 210, if it is detected that the cell temperature is higher than the first temperature threshold, the signal 1 is not sent to the wireless charging control module 240. After S508, the method of the embodiment of the present application may further include S511.

S511, if the signal 1 is not received within the preset time period, the wireless charging control module 240 stops transmitting the ac signal with the preset frequency 1 to the wireless charging coil 260.

Wherein the preset time period is longer than the period of the processor 210 periodically detecting the battery 220.

From the above embodiment, it can be seen that: the processor 210 may periodically detect the cell temperature of the battery 220; if the cell temperature is lower than the first temperature threshold, the processor 210 may send a signal 1 to the wireless charging control module 240; if the cell temperature is greater than or equal to the first temperature threshold, the processor 210 may send a signal 2 to the charging control module 230. That is, the processor 210 only sends the signal 1 to the wireless charging control module 240 when the cell temperature is lower than the first temperature threshold. In other words, if the cell temperature is consistently below the first temperature threshold; then, at intervals of one cycle, the radio charging control module 240 may receive a signal 1. If the wireless charging control module 240 does not receive the signal 1 within the preset time period from the time when the wireless charging control module 240 receives any one of the signals 1, it indicates that the cell temperature is higher than or equal to the first temperature threshold. In this case, the cell temperature may no longer be raised.

Wherein, if the wireless charging control module 240 stops transmitting the alternating current signal with the preset frequency 1 to the wireless charging coil 260; then, wireless charging coil 260 then can't produce above-mentioned alternating electromagnetic field 1 to can not make magnetic shielding material and wireless charging coil 260 produce the heat, and then can stop electric core and preheat, no longer promote electric core temperature.

In other embodiments, the processor 210 may periodically detect the cell temperature of the battery 220; if the cell temperature is below the first temperature threshold, the processor 210 may send a signal 1 to the wireless charging control module 240. After the wireless charging control module 240 receives the signal 1, an alternating current signal of a preset frequency 1 may be transmitted to the wireless charging coil 260 until the wireless charging control module 240 receives a stop signal a from the processor 210. The stop signal a is used to instruct the wireless charging control module 240 to stop transmitting the ac signal of the preset frequency 1 to the wireless charging coil 260. The processor 210 may send the stop signal a to the wireless charging control module 240 when the cell temperature of the battery 220 is higher than the third temperature threshold. Wherein the third temperature threshold is higher than or equal to the first temperature threshold.

The embodiment of the present application provides a charging method, and before charging the battery 220 in a wired manner, the processor 210 may detect a cell temperature of the battery 220. If the cell temperature is less than the preset safe temperature (i.e., the first temperature threshold), the processor 210 may configure the wireless charging control module 240 to drive the wireless charging coil 260 to generate an alternating electromagnetic field at a first preset frequency, so as to simulate a reverse wireless charging process of the mobile phone 200. In this way, the magnetic shielding material and the wireless charging coil 260 can be made to generate heat, and the cell can be preheated before the battery 220 is charged by wire.

Through the scheme of this application embodiment, when can utilize cell-phone 200 reverse wireless charging, the heat that magnetic shield material and wireless charging coil 260 produced realizes that the electricity core preheats. That is, the cell of the mobile phone 200 can be preheated by using heat generated during wireless charging before charging without adding an additional device, so as to ensure the low-temperature charging safety of the mobile phone 200.

It is understood that if there are other metal objects around the cell phone 200; then, the alternating electromagnetic field 1 generated by the mobile phone 200 executing S504-S508 can not only generate heat for the magnetic shielding material and the wireless charging coil 260, but also generate heat for the other metal objects. If the other metal object generates more heat, flammable objects around the other metal object may be burned, and a safety hazard exists.

Moreover, when there is a human body around the mobile phone 200, if the radiation of the alternating electromagnetic field 1 generated by the alternating current signal with the preset frequency 1 to the human body exceeds the standard, the human body will be damaged. In this case, the cell phone 200 does not turn on the cell preheating function.

In order to eliminate the potential safety hazard or damage to the human body, in some embodiments, the mobile phone 200 may perform foreign object detection before performing the above S504, so as to ensure that the mobile phone 200 performs the method of the embodiment of the present application on the premise that there is no other metal object around the mobile phone 200. Specifically, after S503 shown in fig. 5, if the cell temperature is lower than the first temperature threshold, before S504, the processor 210 may determine whether there is a conductor within a preset distance around the mobile phone 200. The conductor is an object that can conduct electricity. The conductor may comprise a metal object or a human body. If there is a conductor within a predetermined distance around the mobile phone 200, the mobile phone 200 does not charge the battery 220 in order to ensure the safety of the low temperature charging of the electronic device. At this time, the handset 200 may perform S502. If there is no conductor within the preset distance around the cell phone 200, the cell phone 200 may execute S504 and subsequent processes to preheat the battery cell.

Exemplarily, for example, when the conductor includes a metal article, as shown in fig. 7, after S503 shown in fig. 5, if the cell temperature is lower than the first temperature threshold, before S504, the method of the embodiment of the present application may further include S701.

S701, the processor 210 determines whether there is a metal object within a preset distance around the mobile phone 200.

Wherein, the preset distance can be configured in the mobile phone 200 in advance. The preset distance may be determined according to the preset frequency 1 and hardware parameters of the wireless charging coil 260 described above. On the premise that hardware parameters of the wireless charging coil 260 are fixed, the larger the preset frequency 1 is, the larger the preset distance is. On the premise that the preset frequency 1 is constant, the hardware parameter of the wireless charging coil 260 may determine the magnetic field strength of the alternating electromagnetic field generated by the wireless charging coil 260. The greater the magnetic field strength of the alternating electromagnetic field generated by the wireless charging coil 260, the greater the preset distance. For example, the predetermined distance may be any length of 10 millimeters (mm), 20mm,30mm, or 40 mm. Alternatively, the preset distance may be preset in the mobile phone 200 by the device manufacturer.

Specifically, if there is no metal object within the preset distance around the mobile phone 200, it indicates that the possibility of potential safety hazard is low if the cell phone 200 performs cell preheating. In this case, the mobile phone 200 may execute S504 and subsequent processes to implement cell preheating.

If there is a metal object within the preset distance around the mobile phone 200, it indicates that if the cell phone 200 performs cell preheating, there is a potential safety hazard due to the metal object around the mobile phone 200. In this case, in order to avoid potential safety hazards, the cell phone 200 does not preheat the battery cell; in order to ensure the low temperature charging safety of the electronic device, the battery 220 is not charged. At this time, the handset 200 may execute S502.

In some embodiments, the cell phone 200 may also send a prompt if there are metal objects within a predetermined distance around the cell phone 200. The prompt message is used to prompt the user that metal objects exist within a preset distance around the mobile phone 200, and the prompt message can also be used to prompt the user to remove the metal objects around the mobile phone 200.

In this embodiment, the mobile phone 200 may determine whether there is a metal object within a preset distance around the mobile phone 200 by using the method described in the following implementation manner (1), implementation manner (2), implementation manner (3), or implementation manner (4).

Implementation (1) and implementation (2): by measuring the Q value of the voltage oscillation attenuation of the matching circuit 250 and the wireless charging coil 260, it is determined whether there is a metal object within a preset distance around the mobile phone 200.

The Q value of the inductive device (e.g., the tank circuit formed by the matching circuit 250 and the wireless charging coil 260) can be used to characterize how fast the voltage oscillation of the inductive device decays. Specifically, the larger the Q value is, the slower the voltage oscillation of the inductance device is attenuated; the smaller the Q value, the faster the voltage oscillation of the inductive device decays. The voltage oscillation damping occurs between the matching circuit 250 and the wireless charging coil 260, specifically: the oscillating voltages of the matching circuit 250 and the wireless charging coil 260 are getting smaller.

It can be appreciated that the more metal objects around the inductive device (e.g., the tank circuit formed by the matching circuit 250 and the wireless charging coil 260), the faster the voltage oscillation of the inductive device decays, and the smaller the Q value of the inductive device; the less metal objects around the inductive device, the slower the voltage oscillation of the inductive device decays and the greater the Q value of the inductive device. Therefore, the mobile phone 200 can determine whether there is a metal object within a preset distance around the mobile phone 200 according to the Q values of the matching circuit 250 and the wireless charging coil 260. The preset threshold may be set according to hardware parameters of the inductance device. For example, the preset threshold may be 20.

In implementation (1), processor 210 may determine the current charge level by inputting a step signal to wireless charging coil 260; then, according to the oscillation attenuation voltage of the step signal after N oscillation periods and the voltage of the step signal, calculating the Q value of the matching circuit 250 and the wireless charging coil 260; finally, according to the calculated Q value, it is determined whether there is a metal object within a preset distance around the mobile phone 200. Specifically, as shown in fig. 8, the above S701 may include S801 to S806.

S801, the processor 210 sends a signal 3 to the wireless charging control module 240. This signal 3 is used to configure the wireless charging control module 240 to transmit a step signal to the matching circuit 250. The voltage of the step signal is a first voltage.

Wherein the step signal is a rectangular wave signal. The step signal is used to measure the Q value of the voltage ringing attenuation of the matching circuit 250 and the wireless charging coil 260. Specifically, after the wireless charging control module 240 transmits a step signal to the matching circuit 250, the processor 210 may measure the Q value of the voltage oscillation attenuation of the step signal at the matching circuit 250 and the wireless charging coil 260 to perform the foreign object detection.

S802, the wireless charging control module 240 receives the signal 3.

S803, the wireless charging control module 240 transmits a step signal to the wireless charging coil 260 through the matching circuit 250, wherein the voltage of the step signal is a first voltage.

For example, referring to fig. 9, a graph of the decay of the oscillating voltage of the matching circuit 250 and the wireless charging coil 260 is shown. The wireless charging control module 240 may transmit a step signal as shown in fig. 9 to the matching circuit 250. The voltage of the step signal is a first voltage (u 1 shown in fig. 9). As shown in fig. 9, at time t1, the oscillation voltage is u1 (i.e., the initial oscillation voltage).

S804, the processor 210 measures the second voltage at two ends of the matching circuit 250 after N oscillation periods through the wireless charging control module 240, wherein N is not less than 2,N and is a positive integer.

It will be appreciated that after the wireless charging control module 240 transmits the step signal to the matching circuit 250, the step signal will attenuate the voltage oscillation between the matching circuit 250 and the wireless charging coil 260 due to the electromagnetic damping of the matching circuit 250 and the wireless charging coil 260. For example, as shown in fig. 9, N (e.g., 4) oscillation cycles are elapsed from time t1, and at time t2, the oscillation voltage is attenuated to u2 (i.e., the second voltage). Wherein, time t2 is after time t1, and u2< u1.

The wireless charging control module 240 may measure a second voltage (e.g., u2 shown in fig. 9) across the matching circuit 250 after N oscillation cycles and transmit the second voltage to the processor 210. The processor 210 may receive the second voltage transmitted by the wireless charging control module 240.

S805, the processor 210 calculates a Q value of the voltage oscillation attenuation of the matching circuit 250 and the wireless charging coil 260 according to the N, the first voltage, and the second voltage.

For example, the processor 210 may employ the first voltage and the second voltage according to the above-mentioned N

The Q value of the voltage oscillation decay of the matching circuit 250 and the wireless charging coil 260 is calculated.

Where pi in equation (1) is the circumferential ratio, u1 is the voltage of the first voltage (i.e., the step signal), and u2 is the second voltage (i.e., the oscillating voltage of the step signal after the step signal has passed through N oscillation cycles).

The following explains the principle of derivation of the above formula (1). After the wireless charging control module 240 transmits the step signal to the matching circuit 250, the voltage of the step signal is exponential (e.g. u = u1 × e) over time due to the electromagnetic damping of the matching circuit 250 and the wireless charging coil 260 ^-βt ) And decreases. Where β is related to the hardware parameters of the matching circuit 250 and the wireless charging coil 260. Wherein the characteristic time τ =1/2 β of electromagnetic damping of the matching circuit 250 and the wireless charging coil 260. Wherein u2= u1 × e after N oscillation periods T (i.e., T = NT) have elapsed ^-βNT 。

From u2= u1 × e ^-βNT It can be derived that:

by>

And τ =1/2 β can result in: />

Wherein it is present>

By>

And &>

It can be derived that: />

S806, the processor 210 judges whether the Q value is smaller than a preset threshold value.

Specifically, if the Q value is smaller than the preset threshold, it indicates that the voltage oscillation of the inductor device is attenuated faster, and there are metal objects within the preset distance around the mobile phone 200. At this time, the handset 200 may perform S502. If the Q value is greater than or equal to the preset threshold, it indicates that the voltage oscillation of the inductance device is attenuated slowly, and no metal object exists within the preset distance around the mobile phone 200. At this time, the handset 200 may perform S504.

In implementation (2), the processor 210 may calculate the Q values of the matching circuit 250 and the wireless charging coil 260 using Root Mean Square (RMS) voltage method. Specifically, the S701 may include:

calculating the Q-value of the matching circuit 250 and the wireless charging coil 260 by calculating the ratio of the root mean square of the input voltage and the output voltage of the matching circuit 250 and the wireless charging coil 260; finally, whether metal objects exist within a preset distance around the mobile phone 200 is judged according to the calculated Q value. Specifically, the above S701 may include the following steps (1) to (5):

step (1) the processor 210 sends a signal 4 to the wireless charging control module 240. This signal 4 is used to instruct the wireless charging control module 240 to measure the input voltage and the output voltage of the matching circuit 250 and the wireless charging coil 260. Step (2) the wireless charging control module 240 measures the input voltage and the output voltage in response to the signal 4, and transmits the measured input voltage and output voltage to the processor 210. Step (3) the processor 210 receives the input voltage and the output voltage measured by the wireless charging control module 240. Step (4), the processor 210 calculates the root mean square of the output voltage and calculates the root mean square of the input voltage; and then calculating the ratio of the root mean square of the output voltage to the root mean square of the input voltage to obtain the Q values of the matching circuit 250 and the wireless charging coil 260. Wherein the Q value is a ratio of a root mean square of the output voltage to a root mean square of the input voltage. Step (5), the processor 210 determines whether the Q value is smaller than a preset threshold. After the step (5), if the Q value is smaller than the preset threshold, the mobile phone 200 may execute S502. If the Q value is greater than or equal to the preset threshold, the handset 200 may execute S504.

Implementation (3): the handset 200 is provided with a SAR sensor (e.g., the SAR sensor 481 shown in fig. 4). The SAR sensor may be used to detect whether there is a metal object within a preset distance of the cell phone 200.

After S503, if the cell temperature is lower than the first temperature threshold, before performing S504, the method of the embodiment of the present application may further include: the processor 210 starts the SAR sensor to detect whether there is a metal object within a preset distance of the mobile phone 200; if a metal object is detected within the preset distance of the mobile phone 200, the mobile phone 200 may execute S502, that is, the cell preheating function is not started; if it is detected that no metal object is within the preset distance of the mobile phone 200, the mobile phone 200 may execute S504, that is, turn on the cell preheating function.

For example, the SAR sensor may transmit the parameters detected by the SAR sensor to the processor 210, and the processor 210 may analyze the parameters detected by the SAR sensor to determine whether there is a metal object within a predetermined distance of the cell phone 200. The specific method for the processor 210 to analyze the parameters detected by the SAR sensor and determine whether there is a metal object within the preset distance of the mobile phone 200 may refer to detailed descriptions in the conventional technology, which are not described herein again in the embodiments of the present application.

Implementation (4): the mobile phone 200 determines whether a metal object is present within a preset distance of the mobile phone 200 according to the Q value and the SAR sensor.

Specifically, the mobile phone 200 may determine that a metal object is located within the preset distance of the mobile phone 200 when the Q value is smaller than the preset threshold value or when the parameters acquired by the SAR sensor are analyzed to determine that a metal object is located within the preset distance of the mobile phone 200. At this time, the mobile phone 200 may execute S502 without turning on the cell preheating function. If it is determined that no metal object exists within the preset distance of the mobile phone 200 by analyzing the parameters acquired by the SAR sensor and the Q value is greater than or equal to the preset threshold, the mobile phone 200 may execute S504 to start the cell core preheating function.

That is to say, in the implementation manner (4), whether a metal object exists within the preset distance of the mobile phone 200 can be determined through the dual determination conditions, so that the accuracy of the foreign object detection can be improved. For example, please refer to table 1, which shows the conditions (i.e. strategies) for turning on the cell preheating function in the embodiment of the present application.

TABLE 1

As shown in table 1, the cell phone 200 starts the cell core preheating function only when analyzing the parameters acquired by the SAR sensor to determine that no metal object is present within the preset distance of the cell phone 200 and the Q value is greater than the preset threshold.

The processor 210 may further analyze the parameter detected by the SAR sensor to detect the approach of the human body. In the embodiment of the application, if the processor 210 detects that there is a human body in the preset distance of the mobile phone 200 through the SAR sensor, in order to avoid that the radiation generated by the alternating electromagnetic field 1 generated by the alternating current signal with the preset frequency 1 to the human body exceeds the standard, the damage to the human body is caused, and the electric core preheating function cannot be started.

In this embodiment, the mobile phone 200 may determine whether there is a metal object within a preset distance around the mobile phone 200 through any one of the above implementation manners (1) to (4). On the premise that it is determined that no metal object exists within the preset distance around the mobile phone 200, that is, no potential safety hazard exists when cell preheating is performed, cell preheating is performed on the battery 220 first, and then the battery 220 is charged. Thus, the low-temperature charging safety of the mobile phone 200 can be ensured.

It can be understood that the environment temperature of the mobile phone 200 is different, and the time required for preheating the battery 220 of the mobile phone 200 is different. Specifically, the lower the ambient temperature of the mobile phone 200 is, the lower the cell temperature of the battery 220 is, and the longer the time required for preheating the battery 220 of the mobile phone 200. In order to adapt to different environmental temperatures, in the embodiment of the present application, when the cell temperature of the battery 220 is in different temperature intervals, ac electrical signals with different frequencies may be transmitted to the wireless charging coil 260.

In this embodiment of the application, a plurality of temperature thresholds may be set in the mobile phone 200, and a plurality of temperature intervals may be divided by the plurality of temperature thresholds, and each temperature interval corresponds to a preset frequency for preheating the battery cell. For example, two temperature thresholds, such as the first temperature threshold (e.g., M1) and the second temperature threshold (M2), can be set in the cell phone 200. Wherein M2 is less than M1. The following temperature ranges, such as (- ∞, M2), [ M2, M1), [ M1, + ∞) can be defined on the basis of the first temperature threshold and the second temperature threshold. For example, the first temperature threshold (e.g., M1) may be 0 deg.C, 2 deg.C, 3 deg.C, or 5 deg.C, etc. The second temperature threshold (e.g., M2) may be-10 ℃, 15 ℃, 8 ℃ or 5 ℃.

When the cell temperature of the battery 220 is less than the first temperature threshold M1, the mobile phone 200 may preheat the cell of the battery 220. For example, [ M1, ∞) corresponds to a preset frequency 2, and [ M2, M1) corresponds to a preset frequency 1. (∞, M2) corresponds to a preset frequency of 3. The preset frequency 3 is greater than the preset frequency 1.

Specifically, after S503, if the cell temperature is lower than the first temperature threshold, the method of the embodiment of the present application may further include S1001 to S1007. For example, as shown in fig. 10, after S503 shown in fig. 5, if the cell temperature is lower than the first temperature threshold, the method of the embodiment of the present application may further include S1001-S1007.

S1001, the processor 210 determines whether the cell temperature of the battery 220 is lower than a second temperature threshold.

Specifically, if the cell temperature is lower than the first temperature threshold (e.g., M1) but greater than or equal to the second temperature threshold (e.g., M2), it indicates that the cell temperature of the battery 220 is [ M2, M1 ], and the difference between the cell temperature of the battery 220 and the cell temperature (e.g., 0 ℃) required in the charging safety specification is small. At this time, the mobile phone 200 transmits an alternating electrical signal with a preset frequency 1 to the wireless charging coil 260, which is enough to complete cell preheating in a short time. Handset 200 may perform S504.

If the cell temperature is lower than the first temperature threshold (e.g., M1) and lower than the second temperature threshold (e.g., M2), it indicates that the cell temperature of battery 220 is at (- ∞, M2), and the cell temperature of battery 220 is far from the cell temperature (e.g., 0 ℃) required by the charging safety specification. At this time, in order to improve the efficiency of cell preheating and shorten the time of cell preheating, the mobile phone 200 may increase the driving frequency of the wireless charging coil 260 to increase the power of induction heating. The handset 200 may perform S1002.

S1002, the processor 210 sends a signal 5 to the wireless charging control module 240.

Wherein the signal 5 is a third signal. From the above description it follows that: after a dc signal (e.g., a 5V dc signal) from the power adapter 280 is inputted into the mobile phone 200 through the charging interface 270, the processor 210 may control the dc signal. In the case where the cell temperature of the battery 220 is lower than the second temperature threshold and the first temperature threshold, the processor 210 may configure the wireless charging control module 240 to receive the direct current signal. The processor 210 may further configure the wireless charging control module 240 to drive the wireless charging coil 260 to perform reverse wireless charging at a preset frequency 3, so as to implement cell preheating.

The signal 5 (i.e., the third signal) is used for configuring the wireless charging control module 240 to receive the direct current signal from the charging interface 270, and drive the wireless charging coil 260 to generate an alternating electromagnetic field at a preset frequency 3 (i.e., a third preset frequency). In the embodiment of the present application, the value range of the preset frequency 3 may be m KHz-n MHz. Wherein m is larger than 205, n can be any value of 1,1.5 or 2, and the like. And, the preset frequency 3 is greater than the preset frequency 1. In this embodiment of the application, the wireless charging coil 260 is driven by the preset frequency 3 to generate an alternating electromagnetic field, which is not induced by the wireless charging coils of other electronic devices, and thus, other electronic devices cannot be wirelessly charged. Thus, it can be avoided that the mobile phone 200 wirelessly charges other electronic devices when executing the method of the embodiment of the present application. Therefore, the problem that the mobile phone 200 may consume electric power for wirelessly charging other electronic devices in the cell preheating process can be avoided.

S1003, the wireless charging control module 240 receives the signal 5.

S1004, in response to signal 5, the wireless charging control module 240 receives the dc signal input by the power adapter 280 through the charging interface 270.

The wireless charging control module 240 may convert the dc signal input by the charging interface 270 into an ac signal with a preset frequency of 3; then, carrying out the operation; an ac signal of a preset frequency 3 is transmitted to the wireless charging coil 260. For example, after S1004, the method of the embodiment of the present application further includes S1005.

S1005, the wireless charging control module 240 converts the dc signal input by the charging interface 270 into an ac signal with a preset frequency of 3, and transmits the ac signal with the preset frequency of 3 to the wireless charging coil 260 through the matching circuit 250.

For example, when the predetermined frequency 1 is 1MHz, the predetermined frequency 3 may be 1.5MHz, and the current of the ac signal may be 1 ampere (a). That is, in S1005, the wireless charging control module 240 may transmit a driving current having a frequency of 1.5MHz to the wireless charging coil 260.

S1006, the wireless charging coil 260 generates an alternating electromagnetic field 3 in response to the alternating current signal of the preset frequency 3. The magnetic shielding material is induced in the alternating electromagnetic field 1 to generate first heat for increasing the temperature of the battery core.

Wherein, the wireless charging coil 260 is provided with a magnetic shielding material. Alternatively, a magnetic shielding material is disposed between the wireless charging coil 260 and the battery 220. The magnetic shielding material can generate a second heat in response to the alternating electromagnetic field 3 (i.e., the third alternating electromagnetic field), and the second heat can be used to raise the cell temperature. Specifically, the alternating electromagnetic field 3 generates hysteresis loss and eddy current loss in the magnetic shield material, thereby generating heat. Further, the larger the frequency of the alternating electric signal is, the more heat is generated by the hysteresis loss and the eddy current loss of the alternating electromagnetic field generated in the magnetic shield material. For example, the second amount of heat is larger than the first amount of heat.

The larger the amount of heat generated by the magnetic shielding material due to hysteresis loss and eddy current loss caused by the alternating electromagnetic field, the larger the amount of temperature change (i.e., the increased temperature value) of the magnetic shielding material. Therefore, the amount of heat generated by hysteresis loss and eddy current loss occurring in the magnetic shield material can be measured by the amount of temperature change of the magnetic shield material over a certain period of time (for example, any fixed period of time such as 1 minute, 30 seconds, or 90 seconds). For example, in the same room temperature environment, the temperature change amount of the magnetic shield material of the mobile phone 200 in the above-mentioned certain period of time when the magnetic shield material is induced by the alternating electromagnetic field 1 (recording temperature change amount 1) can be measured, and the temperature change amount of the magnetic shield material of the mobile phone 200 in the above-mentioned certain period of time when the magnetic shield material is induced by the alternating electromagnetic field 3 (recording temperature change amount 2) can be measured; then, the temperature change amount 1 and the temperature change amount 2 are compared to measure the magnitude of the second heat amount and the first heat amount.

Of course, the manner of measuring the second heat and the first heat in the embodiment of the present application includes, but is not limited to, the manner of comparing the temperature change amounts. For example, the magnitudes of the first heat and the second heat may be measured using an instrument for measuring heat. For a specific method for measuring heat by using an instrument, reference may be made to related descriptions in the conventional technology, and details are not repeated herein in the embodiments of the present application.

For example, in the embodiment of the present application, the effect of preheating the battery cell by the mobile phone 200 is described through simulation data. Experiments were conducted with a cell phone in which the wireless charging coil 260 was made of copper and the magnetic shielding material was 1K107B iron-based nanocrystals. The second temperature threshold is assumed to be 10 ℃ below zero, and the first temperature threshold is assumed to be 0 ℃. The predetermined frequency 1 is 1MHz, and the predetermined frequency 2 is 1.5MHz. The mobile phone is placed in a natural environment with the environment temperature of minus 15 ℃, and the battery core temperature of the battery of the mobile phone is also about minus 15 ℃.

At this time, with the scheme shown in fig. 10, the mobile phone turns on the cell preheating function, so that the wireless charging control module thereof transmits a driving current with a frequency of 1.5MHz to the wireless charging coil to generate the alternating electromagnetic field 3 (i.e., executes S1004-S1006). After a certain time (e.g., 3 minutes), the cell temperature distribution of the mobile phone is shown in fig. 11. As shown in fig. 11, the cell temperature of the mobile phone may be 16.397 ℃ at the highest, 0.59123 ℃ at the lowest, and the average temperature is about 9 ℃ (e.g. 9.3722 ℃). As shown in fig. 11, by the method of the embodiment of the present application, the battery cell temperature can be increased from-15 ℃ to an average temperature of about 9 ℃ by induction heating of the wireless charging coil, so that charging safety can be ensured.

In contrast, if the scheme shown in fig. 5 is passed, the mobile phone turns on the cell preheating function, so that the wireless charging control module thereof transmits a driving current with a frequency of 1MHz to the wireless charging coil to generate an alternating electromagnetic field (i.e., performs S506-S508). After a certain time (e.g., 3 minutes), the cell temperature distribution of the mobile phone is shown in fig. 12. As shown in fig. 12, the cell temperature of the mobile phone may be 0.97792 ℃ at the highest temperature and 7.0971 ℃ at the lowest temperature (i.e., -7.0971 ℃) and the average temperature is about 2.6 ℃ below zero (e.g., -2.611 ℃). As shown in fig. 12, by the method of the embodiment of the present application, the cell temperature may be increased from-15 ℃ to an average temperature of about-2.6 ℃ below zero by induction heating of the wireless charging coil, where the cell temperature is still lower than the first temperature threshold.

To sum up, when the cell temperature of the mobile phone is lower than the second temperature threshold (the second temperature threshold is lower than the first temperature threshold), that is, the cell temperature and the cell temperature (as 0 ℃) required in the charging safety specification have a large difference, the driving frequency of the wireless charging coil 260 is increased, the cell preheating efficiency can be improved, and the cell preheating time is shortened.

After S1006, the cell temperature of the battery 220 may gradually increase. As described in S502, the processor 210 may periodically detect the cell temperature of the battery 220. Therefore, after S1006, the cell temperature detected by the processor 210 may gradually increase with time. However, the cell temperature detected by the processor 210 may still be below the second temperature threshold; at this time, the mobile phone 200 may perform S1002 to S1006 to continue to raise the cell temperature through the reverse wireless charging. Alternatively, the cell temperature detected by the processor 210 may be lower than the first temperature threshold but greater than or equal to the second temperature threshold; at this time, the mobile phone 200 may perform S504-S508 to continue to raise the cell temperature through reverse wireless charging. After a period of time, the cell temperature of battery 220 may be above the first temperature threshold. At this time, the mobile phone 200 may perform S509 to S510 to perform wired charging.

It is to be understood that after S1002 is executed by the processor 210, if it is detected that the cell temperature is higher than the second temperature threshold, no signal 5 is sent to the wireless charging control module 240. After S1006, the method of the embodiments of the present application may further include S1007.

S1007, if the signal 5 is not received within the preset time period, the wireless charging control module 240 stops transmitting the ac signal with the preset frequency of 3 to the wireless charging coil 260.

Wherein the preset time period is longer than the period of the processor 210 periodically detecting the battery 220. From the above embodiment, it can be seen that: the processor 210 may periodically detect the cell temperature of the battery 220; if the cell temperature is below the second temperature threshold, the processor 210 may send a signal 5 to the wireless charging control module 240; if the cell temperature is greater than or equal to the second temperature threshold, the processor 210 may send a signal 2 or a signal 1 to the charging control module 230. That is, the processor 210 will only send the signal 5 to the wireless charging control module 240 if the cell temperature is lower than the second temperature threshold. In other words, if the cell temperature is consistently below the second temperature threshold; then, at intervals of one cycle, the radio charge control module 240 may receive a signal 5. If the wireless charging control module 240 does not receive the signal 5 within the preset time period since the wireless charging control module 240 receives any one of the signals 5, it indicates that the cell temperature is higher than or equal to the second temperature threshold. In this case, the alternating electromagnetic field generated by the alternating current signal with the preset frequency 3 may not be used for cell preheating.

Wherein, if the wireless charging control module 240 stops transmitting the ac signal of the preset frequency 3 to the wireless charging coil 260; then, the wireless charging coil 260 cannot generate the alternating electromagnetic field 3, so that the magnetic shielding material and the wireless charging coil 260 cannot generate heat, and further, the alternating electromagnetic field cell generated by the alternating current signal with the preset frequency of 3 can be stopped from being preheated.

In other embodiments, the processor 210 may periodically detect the cell temperature of the battery 220; if the cell temperature is below the second temperature threshold, the processor 210 may send a signal 5 to the wireless charging control module 240. After the wireless charging control module 240 receives the signal 5, an ac signal of a preset frequency 3 may be transmitted to the wireless charging coil 260 until the wireless charging control module 240 receives the stop signal b from the processor 210. The stop signal b is used to instruct the wireless charging control module 240 to stop transmitting the ac signal of the preset frequency 3 to the wireless charging coil 260.

For example, the stop signal b may be the signal 1. The processor 210 may send the stop signal b to the wireless charging control module 240 when the cell temperature of the battery 220 is less than the first temperature threshold but greater than or equal to the second temperature threshold. The stop signal b is also used to instruct the wireless charging control module 240 to transmit an ac electrical signal of a preset frequency 1 to the wireless charging coil 260.

In this embodiment, the mobile phone 200 may select a corresponding preset frequency to drive the wireless charging coil 260 to generate an alternating electromagnetic field according to the core temperature of the battery 220, so as to preheat the core. Like this, can be when the electric core temperature is less than first temperature threshold value, and the electric core temperature (as 0 ℃) difference that requires in electric core temperature and the safety standard of charging is great (promptly electric core temperature is less than second temperature threshold value), can increase wireless charging coil 260's drive frequency, can promote the efficiency that electric core preheated, shorten the time that electric core preheated.

In the above embodiment, if the cell temperature of the battery 220 is higher than or equal to the first temperature threshold, the mobile phone 200 may turn off the cell preheating function (or referred to as the induction heating function) and exit the induction heating mode. Wherein, cell-phone 200 closes electric core preheating function, withdraws from induction heating mode, specifically indicates: the mobile phone 200 stops cell preheating of the battery 220. For example, if the cell temperature of the battery 220 is higher than the first temperature threshold, the mobile phone 200 may stop cell preheating the battery 220 in the following manner: if the cell temperature is higher than or equal to the first temperature threshold, the processor 210 no longer sends the signal 1 to the wireless charging control module 240, and the wireless charging control module 240 may stop transmitting the ac signal with the preset frequency 1 to the wireless charging coil 260 to stop cell preheating.

It can be understood that, in the process of charging the battery 220 by the mobile phone in S510, the battery cell of the battery 220 may also generate heat. The heat generated by the battery cell during the charging process can be used for maintaining the temperature of the battery cell, so that the temperature of the battery cell is greater than the temperature of the battery cell required in the charging safety specification.

Although the heat generated by the cell during the charging process can be used to maintain the cell temperature; however, if the environment temperature of the mobile phone 200 is low (e.g., -15 ℃); then, it is difficult to maintain the cell temperature at the cell temperature required in the charging safety specification due to the heat generated from the cell during the charging process. Especially in the later stage of charging, the charging current of the battery 220 becomes small, and the heat generated by the battery cell also becomes small, so that it is difficult to maintain the battery cell temperature to be higher than the battery cell temperature required in the charging safety standard. Thus, there is a potential safety hazard.

In order to ensure the low-temperature charging safety of the mobile phone 200, the mobile phone 200 turns off the cell preheating function (also referred to as an induction heating function), and after the mobile phone exits the induction heating mode, the processor 210 may continue to detect the cell temperature of the battery 220 during the charging process of the battery 220, for example, the processor 210 periodically detects the cell temperature of the battery 220. In the process of charging the battery 220, if the processor 210 detects that the cell temperature of the battery 220 is lower than the first temperature threshold, the mobile phone 200 may stop charging the battery 220, and restart the cell preheating function (also referred to as an induction heating function), and enter an induction heating mode to perform cell preheating. Thus, the charging safety of the mobile phone 200 can be ensured. Specifically, in the process of charging the battery 220, if the processor 210 detects that the cell temperature of the battery 220 is lower than the first temperature threshold, the processor 210 may send a signal 1 to the wireless charging control module 240; after receiving the signal 1, the wireless charging control module 240 may transmit an ac signal with a preset frequency 1 to the wireless charging coil 260 in response to the signal 1, so as to preheat the battery cell. Subsequently, if the processor 210 detects that the cell temperature is higher than or equal to the first temperature threshold, the battery 220 may continue to be charged, and the cell preheating function (also referred to as an induction heating function) may be turned off, and the induction heating mode may be exited.

However, if the cell temperature of the battery 220 has just risen to the first temperature threshold, the mobile phone 200 stops cell preheating of the battery 220; then, the cell temperature of the battery 220 may decrease due to the influence of the ambient temperature (e.g., the ambient temperature is very low, e.g., the ambient temperature is minus 10 ℃), so that the cell temperature is lower than the first temperature threshold. In this case, in order to ensure charging safety, it is necessary to stop charging the battery 220, and perform cell preheating again to raise the cell temperature of the battery 220 to the first temperature threshold. Thus, the charging efficiency of the mobile phone 200 is affected.

In order to solve the above problem and improve the charging efficiency of the mobile phone 200, in other embodiments, after S508, if the processor 210 detects that the cell temperature of the battery 220 is higher than or equal to the third temperature threshold, the mobile phone 200 turns off the cell preheating function (or referred to as an induction heating function) and exits the induction heating mode. The third temperature threshold is greater than the first temperature threshold. For example, the first temperature threshold is 0 ℃, the third temperature threshold is 5 ℃,6 ℃ or 8 ℃ or the like.

Specifically, after S508, if the processor 210 detects that the cell temperature is higher than or equal to the first temperature threshold but the cell temperature is lower than the third temperature threshold, the processor 210 may further send a signal 1 to the wireless charging control module 240, instructing the wireless charging control module 240 to transmit an ac signal with a preset frequency of 1 to the wireless charging coil 260, so as to perform cell preheating. If the processor 210 detects that the cell temperature is higher than or equal to the third temperature threshold, the processor 210 may stop the wireless charging control module 240 from sending the signal 1, and the wireless charging control module 240 may stop transmitting the ac signal with the preset frequency 1 to the wireless charging coil 260 to stop the cell preheating.

It should be noted that, if the processor 210 detects that the cell temperature is higher than or equal to the first temperature threshold, and whether the cell temperature is lower than, equal to, or equal to the third temperature threshold, the processor 210 may send a signal 2 to the charging control module 250, instruct the charging control module 250 to receive the dc signal input by the charging interface 270, and use the dc signal to charge the battery 220.

It should be noted that, in this embodiment, when the cell temperature is higher than or equal to the first temperature threshold but lower than the third temperature threshold, the direct current signal input by the charging interface 270 provides an energy source for not only cell preheating but also wired charging for the wireless charging control module 240 and the charging control module 250.

In this embodiment, the cell phone 200 stops cell preheating when the cell temperature is higher than or equal to the third temperature threshold. Thus, even if the environment temperature of the mobile phone 200 is low, the battery cell of the battery 220 may generate heat when the mobile phone performs S510 to charge the battery 220. The heat generated by the battery cell during the charging process can be used for maintaining the temperature of the battery cell, so that the temperature of the battery cell is greater than the temperature of the battery cell required in the charging safety standard.

It should be noted that, in the first application scenario, the preset frequency 1 is a first preset frequency, the preset frequency 2 is a second preset frequency, and the preset frequency 3 is a third preset frequency. The preset frequency 3 is greater than the preset frequency 1, and the preset frequency 1 is greater than the preset frequency 2. The alternating electromagnetic field 1 is a first alternating electromagnetic field, and the alternating electromagnetic field 1 is an alternating electromagnetic field generated by an alternating current signal of a preset frequency 1. The alternating electromagnetic field 2 is an alternating electromagnetic field generated by an alternating current signal of a preset frequency 2. The alternating electromagnetic field 3 is a second alternating electromagnetic field and the alternating electromagnetic field 2 is an alternating electromagnetic field generated by an alternating current signal of a predetermined frequency 3.

The embodiment of the application provides a charging method, which can be applied to a second application scenario (i.e., a forward wireless charging scenario of an electronic device). In a second application scenario, the wireless charger of the mobile phone 200 may wirelessly charge the mobile phone 200. The wireless charger of the mobile phone 200 may be a wireless charging cradle of the mobile phone 200 or other electronic device that can wirelessly charge the mobile phone 200.

For example, the wireless charger of the mobile phone 200 is a wireless charging cradle. As shown in fig. 13A (a), a wireless charger 1300 of the mobile phone 200 is provided. As shown in (c) in fig. 13A, when the cellular phone 200 shown in (b) in fig. 13A is placed on the wireless charger 1300, the wireless charger 1300 can wirelessly charge the cellular phone 200. Note that (a) in fig. 13A only shows an example of one type of wireless charger, and the wireless charger in the embodiment of the present application includes, but is not limited to, the wireless charger shown in (a) in fig. 13A. In the second application scenario, the mobile phone 200 is a first electronic device, and the wireless charger 1300 is a second electronic device.

As shown in fig. 2, the mobile phone 200 (i.e., the first electronic device) may include: processor 210, battery 220, charging control module 230, wireless charging control module 240, matching circuit 250, wireless charging coil 260, and charging interface 270. As shown in fig. 13B, the wireless charger 1300 (i.e., the second electronic device) may include: processor 1310, battery 1320, charging control module 1330, wireless charging control module 1340, matching circuit 1350, wireless charging coil 1360, and charging interface 1370.

It should be noted that the functions of the charging control module 230 and the wireless charging control module 240 may be implemented in a single module (e.g., a charging management module). Similarly, the functions of the charging control module 1330 and the wireless charging control module 1340 can be implemented in a single module (e.g., a charging management module).

An embodiment of the present application provides a charging method, which may include S1401 to S1410, as shown in fig. 14.

S1401, the mobile phone 200 and the wireless charger 1300 perform wireless charging protocol interaction.

Wherein, the mobile phone 200 (e.g. the processor 210 of the mobile phone 200) can interact with the wireless charger 1300 via the wireless charging coil 260. Specifically, S1401 may include: the wireless charging coil 260 of the mobile phone 200 is coupled with the wireless charging coil 1360 of the wireless charger 1300, and the processor 210 interacts with the wireless charger 1300 through the wireless charging coil 260 to wirelessly charge related parameters based on a wireless charging protocol. For a specific method for performing wireless charging protocol interaction between the mobile phone 200 and the wireless charger 1300, reference may be made to related descriptions in the conventional technology, which is not described herein again in this embodiment. In the process of performing wireless charging protocol interaction between the mobile phone 200 and the wireless charger 1300, the mobile phone 200 may further perform foreign object detection (i.e., detect whether there is a metal object within a preset distance around the mobile phone 200), and the like. The specific method for detecting the foreign object by the mobile phone 200 may refer to the description in the above embodiments, and is not repeated herein.

S1402, after the wireless charging protocol interaction is completed, the mobile phone 200 periodically detects the core temperature of the mobile phone 200.

The specific method for the processor 210 of the mobile phone 200 to periodically detect the cell temperature of the battery 220 may refer to the detailed description in S502, which is not repeated herein in this embodiment of the present application.

S1403, the mobile phone 200 determines whether the cell temperature is lower than a first temperature threshold.

The processor 210 of the mobile phone 200 may determine whether the cell temperature is lower than a first temperature threshold. Specifically, if the cell temperature is lower than the first temperature threshold, it indicates that the cell temperature of the battery 220 is lower. At this time, if the battery 220 is directly charged, there may be a safety hazard and damage to the battery 220. In order to ensure the low-temperature charging safety of the mobile phone 200, in the embodiment of the present application, before the battery 220 is charged, the battery 220 may be cell preheated (i.e., the cell preheating function is turned on, and an induction heating mode is entered). Specifically, if the cell temperature of the battery 220 is lower than the first temperature threshold, S1404-S1406 may be performed.

If the cell temperature is greater than or equal to the first temperature threshold, it indicates that the cell temperature of battery 220 is high. At this time, if battery 220 is charged directly, there is a low possibility that there is a safety hazard and battery 220 is damaged. Accordingly, if the cell temperature of battery 220 is greater than or equal to the first temperature threshold, S1408-S1410 may be performed.

S1404, the mobile phone 200 transmits a signal 6 to the wireless charger 1300. This signal 6 is used to request the wireless charger 1300 to generate the alternating electromagnetic field 4 with an alternating current signal of a preset frequency 4.

The preset frequency 4 is a first preset frequency. The preset frequency 4 may be equal to the preset frequency 1 in the first application scenario. The above-mentioned alternating electromagnetic field 4 is a first alternating electromagnetic field. The above-mentioned signal 6 is a first signal.

S1405, the wireless charger 1300 receives the signal 6.

Wherein, the processor 210 of the cell phone 200 can send a signal 6 to the wireless charging coil 1360 of the wireless charger 1300 through the wireless charging coil 260. The wireless charger 1300 may receive the signal 6 through the wireless charging coil 1360.

In other embodiments, the cell phone 200 may establish a wireless connection with the wireless charger 1300. For example, the wireless connection may be a Bluetooth connection, a Wi-Fi connection (e.g., wi-Fi direct), or an NFC connection, among others. The mobile phone 200 can transmit a signal 6 to the wireless charger 1300 through the wireless connection. In this embodiment, the mobile phone 200 and the wireless charger 1300 may include a wireless communication module (at least one module such as a Wi-Fi module, a bluetooth module, or an NFC module).

S1406, in response to the signal 6, the wireless charger 1300 generates the alternating electromagnetic field 4 with an alternating current signal of a preset frequency 4.

Specifically, the processor 1310 of the wireless charger 1300, in response to the signal 6, may instruct the charging management module (e.g., the charging control module 1330 and the wireless charging control module 1340) to transmit an ac signal with a preset frequency of 4 to the wireless charging coil 1360. The charging management module receives a dc signal from the battery of the wireless charger 1300 according to the instruction of the processor 1310, converts the dc signal into an ac signal with a preset frequency of 4, and transmits the ac signal with the preset frequency of 4 to the wireless charging coil 1360. The wireless charging coil 1360 may generate an alternating electromagnetic field 4 in response to the alternating current signal of the preset frequency 4.

The wireless charging coil 260 of the mobile phone 200 is coupled with the wireless charging coil of the wireless charger 1300, which means that the wireless charging coil 260 of the mobile phone 200 is closer to the wireless charging coil of the wireless charger 1300. The wireless charging coil 260 is provided with a magnetic shielding material; alternatively, a magnetic shielding material is disposed between the wireless charging coil 260 and the battery 220. The magnetic shielding material can generate a first heat when being induced by the alternating electromagnetic field 4, so as to raise the cell temperature of the battery 220. Specifically, the alternating electromagnetic field 4 generates hysteresis loss and eddy current loss in the magnetic shield material, and thus generates heat. The magnetic shielding material covers the surface of the battery core of the battery. The heat generated by the magnetic shielding material can be used for preheating the battery cell and improving the temperature of the battery cell. Of course, the wireless charging coil 260 also generates heat by inducing the alternating electromagnetic field 4. The heat that wireless charging coil 260 produced also can be used for the electric core to preheat, promotes electric core temperature.

The wireless charging standard (for example, qi standard) specifies that the frequency of the alternating electrical signal is within a certain frequency range when the electronic device is wirelessly charged. For example, the Qi standard specifies that when the electronic device is wirelessly charged, the frequency of the alternating electrical signal (referred to as a preset frequency of 5) is between 100KHz and 205 KHz. Therefore, the alternating electromagnetic field 4 generated by the wireless charger 1300 at the predetermined frequency 4 cannot be used to charge the battery 220 of the mobile phone 200. That is, the wireless charging coil 260 of the mobile phone 200 is induced by the alternating electromagnetic field 4 and does not charge the battery 220. Therefore, the battery 220 can be prevented from being charged when the cell temperature of the battery 220 is lower than the first temperature threshold, so that potential safety hazards caused by low-temperature charging are reduced.

For example, in the embodiment of the present application, the effect of cell preheating performed by the mobile phone 200 is described by using simulation data. Experiments were conducted with a cell phone in which the wireless charging coil 260 was made of copper and the magnetic shielding material was 1K107B iron-based nanocrystals. The mobile phone is placed in a natural environment with the environment temperature of minus 5 ℃, and the battery core temperature of the battery of the mobile phone is also about minus 5 ℃. At this time, the mobile phone requests the wireless charger 1300 to turn on the cell preheating function (also referred to as an induction heating function), so that the wireless charger 1300 generates the alternating electromagnetic field 4 with a driving current having a frequency of 1MHz (i.e., executes S1404-S1406). After a certain time (e.g., 1 minute), the cell temperature distribution of the mobile phone is shown in fig. 15. As shown in fig. 15, the cell temperature of the mobile phone may be 13.2 ℃ at the highest, 0.59897 ℃ (0.59897 ℃) at the lowest, and 7.0669 ℃ (7.0669 ℃) at the lowest. As shown in fig. 15, by the method of the embodiment of the present application, the battery cell temperature can be increased from-5 ℃ to an average temperature of about 7 ℃ by induction heating of the wireless charging coil, so that charging safety can be ensured.

It is to be understood that after S1403, if it is detected that the cell temperature is higher than or equal to the first temperature threshold, the mobile phone 200 will not send the signal 6 to the wireless charger 1300. After S1406, the method of the embodiment of the present application may further include S1407.

S1407, if the signal 6 is not received within the preset time period, the wireless charger 1300 stops generating the alternating electromagnetic field 4 with the alternating current signal of the preset frequency 4.

It should be noted that, for the detailed description of S1407, reference may be made to the description of S511 in the foregoing embodiment, which is not described herein again.

In other embodiments, after S1406, the cell temperature of battery 220 may be gradually increased. As described in S1402, the processor 210 may periodically detect the cell temperature of the battery 220. Therefore, after S1406, the cell temperature detected by the mobile phone 200 gradually increases with time. However, the cell temperature detected by the cell phone 200 may still be lower than the first temperature threshold; at this time, the mobile phone 200 may execute S1404-S1406 to continue to raise the cell temperature by induction heating. After a period of time, the cell temperature of battery 220 may be above the first temperature threshold. At this time, the mobile phone 200 may execute S1408 to trigger the wireless charger 1300 to wirelessly charge the mobile phone 200.

S1408, the mobile phone 200 transmits a signal 7 to the wireless charger 1300. This signal 7 is used to request the wireless charger 1300 to generate an alternating electromagnetic field 5 with an alternating current signal of a preset frequency 5.

Wherein the predetermined frequency 5 is a second predetermined frequency. The preset frequency 4 is higher than the preset frequency 5, and the preset frequency 5 is the frequency of the ac signal for the wireless charging of the mobile phone 200. For example, the preset frequency 5 may be equal to the preset frequency 2 in the first application scenario. The above-mentioned signal 7 is the second signal. The alternating electromagnetic field 5 is a second alternating electromagnetic field.

S1409 and the wireless charger 1300 receive the signal 7.

The specific manner in which the mobile phone 200 sends the signal 7 to the wireless charger 1300 and the wireless charger 1300 receives the signal 7 may refer to the description of S1404 to S1405 in this embodiment, which is not described herein again.

S1410, in response to the signal 7, the wireless charger 1300 generates an alternating electromagnetic field 5 with an alternating current signal of a preset frequency 5 to charge the mobile phone 200.

Specifically, the processor 1310 of the wireless charger 1300, in response to the signal 7, may instruct the charging management module (including the charging control module 1330 and the wireless charging control module 1340) to transmit an ac signal with a preset frequency of 5 to the wireless charging coil 1360. The charging management module receives a dc signal from the battery of the wireless charger 1300 according to the instruction of the processor 1310, converts the dc signal into an ac signal with a preset frequency of 5, and transmits the ac signal with the preset frequency of 5 to the wireless charging coil 1360. The wireless charging coil 1360 may generate an alternating electromagnetic field 5 in response to the alternating current signal of the preset frequency 5.

The wireless charging coil 260 of the mobile phone 200 may generate an alternating current signal in response to the alternating electromagnetic field 5 and transmit the alternating current signal to the charging management module (including the charging control module 230 and the wireless charging control module 240). The charging management module can receive the ac electrical signal, convert the ac electrical signal into a dc electrical signal, and use the dc electrical signal to charge the battery 220.

The embodiment of the application provides a charging method, and before wirelessly charging a battery 220, a mobile phone 200 may detect a cell temperature of the battery 220. If the cell temperature is less than the preset safe temperature (i.e., the first temperature threshold), the mobile phone 200 may request the wireless charger 1300 to drive the wireless charging coil of the wireless charger 1300 to generate the alternating electromagnetic field 4 at a first preset frequency (i.e., the preset frequency 4), so as to implement the induction heating. In this way, the magnetic shielding material and the wireless charging coil 260 can be made to generate heat, and the cell can be preheated before wirelessly charging the battery 220.

Through the scheme of this application embodiment, can utilize cell-phone 200 when wireless charging in forward, the heat that magnetic shield material and wireless charging coil 260 produced realizes that the electric core preheats. Namely, the cell of the mobile phone 200 can be preheated before charging without adding additional devices, so as to ensure the low-temperature charging safety of the mobile phone 200.

In a second application scenario (i.e. a forward wireless charging scenario of an electronic device), when the cell temperature of the battery 220 is in different temperature intervals, the mobile phone 200 may request the wireless charger 1300 to generate different alternating electromagnetic fields at different preset frequencies. As can be seen from the foregoing embodiments, a plurality of temperature thresholds may be set in the mobile phone 200, and a plurality of temperature intervals may be divided by the plurality of temperature thresholds, where each temperature interval corresponds to a preset frequency for cell preheating. For example, two temperature thresholds, such as the first temperature threshold (e.g., M1) and the second temperature threshold (M2), can be set in the cell phone 200. Wherein M2 is less than M1.

When the cell core temperature of the battery 220 is less than the first temperature threshold M1, the mobile phone 200 may preheat the cell core of the battery 220. For example, [ M1, ∞) corresponds to a predetermined frequency of 5, [ M2, M1) corresponds to a predetermined frequency of 4, and (∞, M2) corresponds to a predetermined frequency of 6. The preset frequency 6 is greater than the preset frequency 4.

Specifically, after S1403, if the cell temperature is lower than the first temperature threshold, the method of the embodiment of the present application may further include S1601-S1605. For example, as shown in fig. 16, after S1403 shown in fig. 14, if the cell temperature is lower than the first temperature threshold, the method of the embodiment of the present application may further include S1601-S1605.

S1601, the mobile phone 200 determines whether the cell temperature of the battery 220 is lower than a second temperature threshold.

S1601 may refer to the detailed description of S1001, which is not repeated herein in this embodiment of the present application. Specifically, if the cell temperature is lower than the first temperature threshold (e.g., M1) but greater than or equal to the second temperature threshold (e.g., M2), it indicates that the cell temperature of the battery 220 is [ M2, M1 ], and the difference between the cell temperature of the battery 220 and the cell temperature (e.g., 0 ℃) required in the charging safety specification is small. At this time, the handset 200 may perform S1404.

If the cell temperature is below the first temperature threshold (e.g., M1) and below the second temperature threshold (e.g., M2), it indicates that the cell temperature of the battery 220 is (— ∞, M2), and the cell temperature of the battery 220 is different from the cell temperature (e.g., 0 ℃) required in the charging safety specification by a relatively large amount. At this time, in order to improve the efficiency of cell preheating and shorten the time of cell preheating, the mobile phone 200 may increase the driving frequency of the wireless charging coil 260 to increase the power of induction heating. The handset 200 may perform S1602.

S1602, the mobile phone 200 transmits a signal 8 to the wireless charger 1300. This signal 8 is used to request the wireless charger 1300 to generate an alternating electromagnetic field 6 with an alternating current signal of a preset frequency 6.

Where signal 8 is the third signal. The preset frequency 6 is a third preset frequency. The alternating electromagnetic field 6 is a third alternating electromagnetic field. The predetermined frequency 6 is greater than the predetermined frequency 4 (i.e., the first predetermined frequency).

S1603, the wireless charger 1300 receives the signal 8.

S1604, in response to the signal 8, the wireless charger 1300 generates an alternating electromagnetic field 6 with an alternating current signal of a preset frequency 6.

Specifically, the processor 1310 of the wireless charger 1300, in response to the signal 8, may instruct the charging management module (e.g., the charging control module 1330 and the wireless charging control module 1340) to transmit an ac signal with a preset frequency of 6 to the wireless charging coil 1360. The charging management module receives a dc signal from the battery of the wireless charger 1300 according to the instruction of the processor 1310, converts the dc signal into an ac signal with a preset frequency of 6, and transmits the ac signal with the preset frequency of 6 to the wireless charging coil 1360. The wireless charging coil 1360 may generate an alternating electromagnetic field 6 in response to the alternating current signal of the preset frequency 6.

It should be noted that, reference may be made to the detailed description in S1005-S1006 for the principle that the mobile phone 200 implements the cell preheating in response to the alternating electromagnetic field 6, which is not described herein again in this embodiment of the present application.

In this application embodiment, when the core temperature of the mobile phone 200 is lower than the second temperature threshold (the second temperature threshold is lower than the first temperature threshold), that is, when the core temperature differs from the core temperature (e.g., 0 ℃) required in the charging safety specification by a relatively large amount, the driving frequency of the alternating electromagnetic field generated by the wireless charger 1300 is increased, the efficiency of preheating the core can be improved, and the time of preheating the core can be shortened.

After S1604, the cell temperature of the battery 220 may gradually increase. As described in S1402, the mobile phone 200 may periodically detect the cell temperature of the battery 220. Therefore, after S1604, the cell temperature detected by the mobile phone 200 may gradually increase with time. However, the cell temperature detected by the cell phone 200 may still be lower than the second temperature threshold; at this time, the mobile phone 200 may execute S1601 to S1604 to continue to raise the cell temperature through induction heating. Alternatively, the cell temperature detected by the mobile phone 200 may be lower than the first temperature threshold but greater than or equal to the second temperature threshold; at this time, the mobile phone 200 may execute S1402-S1406 to continue to raise the cell temperature by induction heating. After a period of time, the cell temperature of battery 220 may be above the first temperature threshold. At this time, the cellular phone 200 may perform S1408 to S1410 for wireless charging.

It is to be understood that after the cell phone 200 executes S1403, if it is detected that the cell temperature is higher than the second temperature threshold, the signal 7 is not sent to the wireless charger 1300. After S1604, the method of the embodiment of the present application may further include S1605.

S1605, if the signal 8 is not received within the preset time period, the wireless charger 1300 stops driving the wireless charging coil to generate the alternating electromagnetic field 6 at the preset frequency 6.

It should be noted that, for a detailed description of S1605, reference may be made to the description of S1007 in the foregoing embodiment, which is not described herein again.

In this embodiment, the mobile phone 200 may request the wireless charger 1300 to drive the wireless charging coil of the wireless charger 1300 to generate an alternating electromagnetic field at a corresponding preset frequency according to the cell core temperature of the battery 220, so as to preheat the cell core. Like this, can be less than first temperature threshold value at electric core temperature, and electric core temperature (as 0 ℃) that the electric core temperature and the requirement in the safety standard of charging differ greatly (be that electric core temperature is less than second temperature threshold value), can increase wireless charger 1300's drive frequency, can promote the efficiency that electric core preheated, shorten the time that electric core preheated.

It should be noted that, in the second application scenario, the preset frequency 4 is a first preset frequency, the preset frequency 5 is a second preset frequency, and the preset frequency 6 is a third preset frequency. The preset frequency 6 is greater than the preset frequency 4, and the preset frequency 4 is greater than the preset frequency 5. The alternating electromagnetic field 4 is a first alternating electromagnetic field, and the alternating electromagnetic field 4 is an alternating electromagnetic field generated by an alternating current signal of a preset frequency 4. The alternating electromagnetic field 5 is a second alternating electromagnetic field, and the alternating electromagnetic field 5 is an alternating electromagnetic field generated by an alternating current signal of a preset frequency 5. The alternating electromagnetic field 6 is a third alternating electromagnetic field, and the alternating electromagnetic field 6 is an alternating electromagnetic field generated by an alternating current signal of a preset frequency 6.

The embodiment of the application provides a charging method, which can be applied to a third application scenario (i.e., a reverse wireless charging scenario of an electronic device). In a third application scenario, the mobile phone 200 may be used as a wireless charger to wirelessly charge other devices. Before the mobile phone 200 wirelessly charges other devices, the mobile phone 200 may perform cell preheating on the other devices in response to requests of the other devices, so as to ensure low-temperature charging safety of the other devices.

For a specific method for implementing cell preheating of other devices when the mobile phone 200 is used as a wireless charger to wirelessly charge other devices, reference may be made to the method for implementing cell preheating of the mobile phone 200 when the wireless charger 1300 is used to wirelessly charge the mobile phone 200 in the foregoing embodiment, which is not described herein again in this embodiment of the present application.

Other embodiments of the present application provide an electronic device, which may include: the device comprises a processor, a memory, a battery, a charging control module, a charging interface, a wireless charging control module, a matching circuit and a wireless charging coil. Alternatively, the charging control module and the wireless charging control module may be implemented in one device (e.g., a charging management module). The memory, the battery, the charging control module, the charging interface and the wireless charging control module are coupled with the processor. The wireless charging control module is connected with the matching circuit, and the matching circuit is connected with the wireless charging coil. The wireless charging control module is also connected with the charging control module. The charging control module is connected with the battery and the charging interface. The memory described above is used to store computer program code comprising computer instructions. When the processor executes the computer instructions, the electronic device may perform the functions or steps performed by the various components of the handset in the above-described method embodiments. The structure of the electronic device may refer to the structure of the electronic device 400 shown in fig. 4.

The embodiment of the application also provides a chip system, and the chip system can be applied to electronic equipment comprising a wireless charging coil and a memory. The electronic equipment can realize forward wireless charging and reverse wireless charging through the wireless charging coil.

As shown in fig. 17, the chip system 1700 includes at least one processor 1701 and at least one interface circuit 1702. The processor 1701 and the interface circuit 1702 may be interconnected by wires. For example, the interface circuit 1702 may be used to receive signals from other devices, such as a memory of an electronic device. As another example, the interface circuit 1702 may be used to send signals to other devices, such as the processor 1701. Illustratively, the interface circuit 1702 may read instructions stored in memory and send the instructions to the processor 1701. The instructions, when executed by the processor 1701, may cause the electronic device to perform the various steps in the embodiments described above. Of course, the chip system may further include other discrete devices, which is not specifically limited in this embodiment of the present application.

Embodiments of the present application also provide a computer storage medium, which includes computer instructions, and when the computer instructions are executed on the above electronic apparatus, the electronic apparatus is caused to perform the functions or steps performed by the above method embodiments in the mobile phone 200 (e.g., each device in the mobile phone 200) or the wireless charger 1300 (e.g., each device in the wireless charger 1300).

Embodiments of the present application also provide a computer program product, which when run on a computer, causes the computer to execute the functions or steps performed by the mobile phone 200 (e.g., the devices in the mobile phone 200) or the wireless charger 1300 (e.g., the devices in the wireless charger 1300) in the above method embodiments.

Through the description of the above embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or multiple physical units, that is, may be located in one place, or may be distributed in multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a variety of media that can store program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electronic device, characterized in that the electronic device comprises: the charging system comprises a processor, a battery, a charging control module, a wireless charging coil and a charging interface; the wireless charging coil is covered with a magnetic shielding material, or the magnetic shielding material is arranged between the wireless charging coil and the battery;

the charging interface is used for receiving a direct current signal;

the processor is used for periodically detecting the cell temperature of the battery if the charging interface is detected to input a direct current signal;

the processor is further configured to determine that the cell temperature is lower than a first temperature threshold, and determine whether a metal object is present within a preset distance around the electronic device by measuring a Q value of an inductance device, where the Q value may be used to represent how fast voltage oscillation of the inductance device attenuates; if the Q value is larger than or equal to a preset threshold value, determining that no metal object exists in the preset distance, and sending a first signal to the wireless charging control module;

the wireless charging control module is used for responding to the first signal and transmitting an alternating current signal with a first preset frequency to the wireless charging coil, wherein the first preset frequency is higher than a second preset frequency, and the second preset frequency is the frequency of the alternating current signal for wirelessly charging the electronic equipment;

the wireless charging coil is used for responding to the alternating current signal with the first preset frequency and generating a first alternating electromagnetic field and heat, wherein the magnetic shielding material induces the first alternating electromagnetic field to generate first heat and is used for increasing the cell temperature;

the processor is further configured to send a second signal to the charging control module if it is determined that the cell temperature is higher than the first temperature threshold;

and the charging control module is used for responding to the second signal, receiving the direct current signal input by the charging interface and charging the battery by using the direct current signal input by the charging interface.

2. The electronic device of claim 1, wherein the processor is further configured to:

after determining that the cell temperature is below the first temperature threshold, determining that the cell temperature is above or equal to a second temperature threshold, the second temperature threshold being below the first temperature threshold, before transmitting the first signal to the wireless charging control module.

3. The electronic device of claim 2, wherein the processor is further configured to transmit a third signal to the wireless charging control module if it is determined that the cell temperature is below the second temperature threshold;

the wireless charging control module is further configured to transmit an alternating current signal of a third preset frequency to the wireless charging coil in response to the third signal, wherein the third preset frequency is higher than the first preset frequency;

the wireless charging coil is further used for responding to an alternating current signal with a third preset frequency to generate a second alternating electromagnetic field, the magnetic shielding material is induced to the second alternating electromagnetic field to generate second heat, the second heat is used for increasing the temperature of the battery core, and the second heat is larger than the first heat.

4. The electronic device of any of claims 1-3, wherein the wireless charging control module, responsive to the first signal, transmits an alternating current signal at a first preset frequency to the wireless charging coil, comprises:

the wireless charging control module is used for responding to the first signal, receiving a direct current signal input by the charging interface, and converting the direct current signal input by the charging interface into an alternating current signal with the first preset frequency; and transmitting the alternating current signal of the first preset frequency to the wireless charging coil.

5. The electronic device of any of claims 1-3, wherein the wireless charging control module, in response to the first signal, is to transmit an alternating current signal at a first preset frequency to the wireless charging coil, comprising:

the wireless charging control module is used for responding to the first signal, receiving a direct current signal from the battery and converting the direct current signal from the battery into an alternating current signal with the first preset frequency; and transmitting the alternating current signal of the first preset frequency to the wireless charging coil.

6. The electronic device of any of claims 1-3, wherein the processor is further configured to:

determining that there are no conductors within a preset distance around the electronic device prior to sending the first signal to the wireless charging control module.

7. The electronic device of claim 6, wherein the processor is further configured to issue a prompt message if it is determined that the conductor is within the preset distance, and the prompt message is used to prompt a user to remove the conductor.

8. The electronic device according to any of claims 1-3, wherein the wireless charging control module is further configured to, after receiving the first signal, stop transmitting the first predetermined frequency AC signal to the wireless charging coil if the first signal is not received within a predetermined time period, where the predetermined time period is longer than a period during which the processor periodically detects the cell temperature.

9. An electronic device, wherein the electronic device is a first electronic device, the first electronic device comprising: the charging management system comprises a processor, a charging management module, a battery and a wireless charging coil; the wireless charging coil is covered with a magnetic shielding material, or the magnetic shielding material is arranged between the wireless charging coil and the battery;

the processor is configured to periodically detect a cell temperature of the battery after a wireless charging protocol interaction is performed between the wireless charging coil and a second electronic device, where the second electronic device is configured to wirelessly charge the first electronic device;

the processor is further configured to determine that the cell temperature is lower than a first temperature threshold, and determine whether metal objects are present within a preset distance around the first electronic device by measuring a Q value of an inductance device, where the Q value may be used to represent how fast voltage oscillation of the inductance device attenuates; if the Q value is greater than or equal to a preset threshold, determining that no metal object exists within the preset distance, and sending a first signal to the second electronic device through the wireless charging coil, wherein the first signal is used for requesting the second electronic device to generate a first alternating electromagnetic field and heat with an alternating current signal of a first preset frequency, the first preset frequency is higher than a second preset frequency, the second preset frequency is the frequency of the alternating current signal wirelessly charged by the first electronic device, and the magnetic shielding material induces the first alternating electromagnetic field to generate the first heat for increasing the temperature of the electric core;

the processor is further configured to send a second signal to the second electronic device through the wireless charging coil if it is determined that the cell temperature is higher than or equal to the first temperature threshold, where the second signal is used to request the second electronic device to generate a second alternating electromagnetic field with an alternating current signal of the second preset frequency;

the wireless charging coil is also used for inducing the second alternating electromagnetic field to generate an alternating current signal and transmitting the alternating current signal to the charging management module;

the charging management module is used for receiving the alternating current signal from the wireless charging coil, converting the alternating current signal into a direct current signal and charging the battery by using the direct current signal.

10. The electronic device of claim 9, wherein the processor is further configured to:

after determining that the cell temperature is below the first temperature threshold, determining that the cell temperature is above or equal to a second temperature threshold, the second temperature threshold being below the first temperature threshold, before transmitting the first signal to the second electronic device.

11. The electronic device of claim 10, wherein the processor is further configured to send a third signal to the second electronic device if it is determined that the cell temperature is lower than the second temperature threshold, wherein the third signal is used to request the second electronic device to generate a third alternating electromagnetic field with an alternating current signal at a third preset frequency, the third preset frequency is higher than the first preset frequency, and the magnetic shielding material induces the third alternating electromagnetic field to generate a second heat for increasing the cell temperature, and the second heat is greater than the first heat.

12. An electronic device, wherein the electronic device is a second electronic device, and wherein the second electronic device is configured to wirelessly charge a first electronic device, the second electronic device comprising: the charging management module comprises a processor, a charging management module, a battery and a wireless charging coil;

the processor is configured to receive a first signal from the first electronic device after wireless charging protocol interaction is performed between the wireless charging coil and the first electronic device, and under the condition that no metal object exists within a preset distance around the first electronic device, the first signal is used to request the second electronic device to generate an alternating electromagnetic field with an alternating current signal of a first preset frequency, where the first preset frequency is higher than a second preset frequency, and the second preset frequency is a frequency of an alternating current signal of the first electronic device for wireless charging;

the processor is further configured to instruct, in response to the first signal, the charging management module to transmit an alternating current signal of the first preset frequency to the wireless charging coil;

the charging management module is used for converting the direct current signal from the battery into an alternating current signal with a first preset frequency according to the indication of the processor and transmitting the alternating current signal with the first preset frequency to the wireless charging coil;

the wireless charging coil is used for responding to the alternating current signal with the first preset frequency and generating a first alternating electromagnetic field and heat, and the first alternating electromagnetic field acts on a magnetic shielding material of the first electronic equipment to generate first heat so as to raise the temperature of a battery cell of the first electronic equipment;

the processor further configured to receive a second signal from the first electronic device through the wireless charging coil, the second signal configured to request the second electronic device to generate an alternating electromagnetic field with an alternating current electrical signal at the second preset frequency;

the processor is further configured to instruct the charging management module to transmit an alternating current signal of the second preset frequency to the wireless charging coil in response to the second signal;

the charging management module is further configured to convert the direct current signal from the battery into an alternating current signal with a second preset frequency according to an instruction of the processor, and transmit the alternating current signal with the second preset frequency to the wireless charging coil;

the wireless charging coil is further used for responding to the alternating current signal with the second preset frequency and generating a second alternating electromagnetic field, and the second alternating electromagnetic field acts on the wireless charging coil of the first electronic device and is used for charging the first electronic device.

13. The electronic device of claim 12, wherein the processor is further configured to receive a third signal from the first electronic device through the wireless charging coil, the third signal being configured to request the second electronic device to generate an alternating electromagnetic field with an alternating current signal at a third preset frequency, the third preset frequency being higher than the first preset frequency;

the processor is further configured to instruct, in response to the third signal, the charging management module to transmit an alternating current signal of the third preset frequency to the wireless charging coil;

the charging management module is further configured to convert the direct current signal from the battery into an alternating current signal at a third preset frequency according to an instruction of the processor, and transmit the alternating current signal at the third preset frequency to the wireless charging coil;

the wireless charging coil is further used for responding to the alternating current signal with the third preset frequency and generating a third alternating electromagnetic field, the third alternating electromagnetic field acts on a magnetic shielding material of the first electronic equipment to generate second heat, the second heat is used for increasing the battery core temperature of the first electronic equipment, and the second heat is larger than the first heat.

14. A charging system is characterized by comprising a first electronic device and a second electronic device, wherein the second electronic device is used for wirelessly charging the first electronic device;

after the first electronic device and the second electronic device perform wireless charging protocol interaction, periodically detecting the cell temperature of a battery of the first electronic device;

when the first electronic device determines that the cell temperature is lower than a first temperature threshold, whether a metal object exists in a preset distance around the first electronic device is judged by measuring a Q value of an inductance device, wherein the Q value can be used for representing the voltage oscillation attenuation speed of the inductance device;

if the Q value is greater than or equal to a preset threshold, the first electronic device determines that the metal object is not present within the preset distance, and sends a first signal to the second electronic device, where the first signal is used to request the second electronic device to generate a first alternating electromagnetic field with an alternating current signal of a first preset frequency, the first preset frequency is higher than a second preset frequency, and the second preset frequency is the frequency of the alternating current signal for wireless charging of the electronic device;

the second electronic device receiving the first signal from the first electronic device, in response to the first signal, generating the first alternating electromagnetic field and heat with an alternating current electrical signal at the first preset frequency;

a magnetic shielding material in the first electronic device induces the first alternating electromagnetic field to generate first heat for raising the temperature of the battery core;

the first electronic device sends a second signal to the second electronic device if determining that the cell temperature is higher than or equal to the first temperature threshold, where the second signal is used to request the second electronic device to generate a second alternating electromagnetic field with the alternating current signal of the second preset frequency;

the second electronic device receives the second signal from the first electronic device, and generates the second alternating electromagnetic field with the alternating current electric signal of the second preset frequency in response to the second signal;

and the first electronic equipment induces the second alternating electromagnetic field through a wireless charging coil to generate an alternating current signal, converts the alternating current signal into a direct current signal, and charges a battery by using the direct current signal.

15. A charging method is applied to an electronic device, and the electronic device comprises the following steps: the charging system comprises a processor, a battery, a charging control module, a wireless charging coil and a charging interface; a magnetic shielding material covers the wireless charging coil, or a magnetic shielding material is arranged between the wireless charging coil and the battery; the method comprises the following steps:

the charging interface receives a direct current signal;

if the processor detects that the direct current signal is input into the charging interface, periodically detecting the cell temperature of the battery;

the processor determines that the temperature of the battery core is lower than a first temperature threshold, and judges whether metal objects exist in a preset distance around the electronic equipment or not by measuring a Q value of an inductance device, wherein the Q value can be used for representing the voltage oscillation attenuation speed of the inductance device;

the processor is further configured to determine that no metal object exists within the preset distance if the Q value is greater than or equal to a preset threshold, and send a first signal to the wireless charging control module;

the wireless charging control module responds to the first signal and transmits an alternating current signal with a first preset frequency to the wireless charging coil, wherein the first preset frequency is higher than a second preset frequency, and the second preset frequency is the frequency of the alternating current signal for wireless charging of the electronic equipment;

the wireless charging coil responds to an alternating current signal with a first preset frequency to generate a first alternating electromagnetic field and heat, wherein the magnetic shielding material induces the first alternating electromagnetic field to generate first heat for increasing the cell temperature;

the processor determines that the cell temperature is higher than the first temperature threshold, and sends a second signal to the charging control module;

and the charging control module responds to the second signal, receives the direct current signal input by the charging interface and charges the battery by using the direct current signal input by the charging interface.

16. The method of claim 15, further comprising:

the processor determines that the cell temperature is greater than or equal to a second temperature threshold after determining that the cell temperature is less than the first temperature threshold before transmitting the first signal to the wireless charging control module, wherein the second temperature threshold is less than the first temperature threshold.

17. The method of claim 16, further comprising:

the processor determines that the cell temperature is lower than the second temperature threshold, and transmits a third signal to the wireless charging control module;

the wireless charging control module responds to the third signal and transmits an alternating current signal with a third preset frequency to the wireless charging coil, wherein the third preset frequency is higher than the first preset frequency;

the wireless charging coil responds to an alternating current signal with a third preset frequency to generate a second alternating electromagnetic field, wherein the magnetic shielding material induces the second alternating electromagnetic field to generate second heat for increasing the temperature of the battery core, and the second heat is larger than the first heat.

18. The method of any of claims 15-17, wherein the wireless charging control module, in response to the first signal, transmits an alternating current signal at a first preset frequency to the wireless charging coil, comprising:

the wireless charging control module responds to the first signal, receives the direct current signal input by the charging interface, and converts the direct current signal input by the charging interface into an alternating current signal with the first preset frequency; and transmitting the alternating current signal of the first preset frequency to the wireless charging coil.

19. The method of any of claims 15-17, wherein the wireless charging control module, in response to the first signal, transmits an alternating current signal at a first preset frequency to the wireless charging coil, comprising:

the wireless charging control module responds to the first signal, receives a direct current signal from the battery and converts the direct current signal from the battery into an alternating current signal with the first preset frequency; and transmitting the alternating current signal of the first preset frequency to the wireless charging coil.

20. The method according to any one of claims 15-17, further comprising:

the processor determines that there are no conductors within a preset distance around the electronic device before sending the first signal to the wireless charging control module.

21. The method of claim 20, further comprising:

and if the processor determines that the conductor exists in the preset distance, sending prompt information, wherein the prompt information is used for prompting a user to remove the conductor.

22. The method according to any one of claims 15-17, further comprising:

after the wireless charging control module receives the first signal, if the first signal is not received within a preset time period, the wireless charging control module stops transmitting the alternating current signal with the first preset frequency to the wireless charging coil, wherein the preset time period is longer than a period of the processor for periodically detecting the temperature of the battery core.

23. A charging method is applied to an electronic device, wherein the electronic device is a first electronic device, and the first electronic device comprises: the charging management module comprises a processor, a charging management module, a battery and a wireless charging coil; a magnetic shielding material covers the wireless charging coil, or a magnetic shielding material is arranged between the wireless charging coil and the battery; the method comprises the following steps:

after the processor performs wireless charging protocol interaction with second electronic equipment through the wireless charging coil, periodically detecting the cell temperature of the battery, wherein the second electronic equipment is used for wirelessly charging the first electronic equipment;

the processor determines that the cell temperature is lower than a first temperature threshold, and then judges whether a metal object exists within a preset distance around the first electronic device by measuring a Q value of an inductance device, wherein the Q value can be used for representing the voltage oscillation attenuation speed of the inductance device;

if the Q value is greater than or equal to a preset threshold, the processor determines that the metal object is not present within the preset distance, and sends a first signal to the second electronic device through the wireless charging coil, where the first signal is used to request the second electronic device to generate a first alternating electromagnetic field and heat with an alternating current signal of a first preset frequency, the first preset frequency is higher than a second preset frequency, the second preset frequency is a frequency of the alternating current signal of the first electronic device for wireless charging, and the magnetic shielding material induces the first alternating electromagnetic field to generate first heat to raise the temperature of the electric core;

the processor determines that the cell temperature is higher than or equal to the first temperature threshold, and sends a second signal to the second electronic device through the wireless charging coil, wherein the second signal is used for requesting the second electronic device to generate a second alternating electromagnetic field with an alternating current signal of the second preset frequency;

the wireless charging coil induces the second alternating electromagnetic field to generate an alternating current signal and transmits the alternating current signal to the charging management module;

the charging management module receives the alternating current signal from the wireless charging coil, converts the alternating current signal into a direct current signal, and charges the battery by using the direct current signal.

24. The method of claim 23, further comprising:

the processor determines that the cell temperature is greater than or equal to a second temperature threshold that is lower than the first temperature threshold after determining that the cell temperature is lower than the first temperature threshold before sending the first signal to the second electronic device.

25. The method of claim 24, further comprising:

the processor determines that the cell temperature is lower than the second temperature threshold, and sends a third signal to the second electronic device, where the third signal is used to request the second electronic device to generate a third alternating electromagnetic field with an alternating current signal at a third preset frequency, where the third preset frequency is higher than the first preset frequency, and the magnetic shielding material induces the third alternating electromagnetic field to generate a second heat for increasing the cell temperature, where the second heat is greater than the first heat.

26. A charging method is applied to an electronic device, wherein the electronic device is a second electronic device, the second electronic device is used for wirelessly charging a first electronic device, and the second electronic device comprises: the charging management system comprises a processor, a charging management module, a battery and a wireless charging coil; the method comprises the following steps:

after the processor performs wireless charging protocol interaction with the first electronic device through the wireless charging coil, receiving a first signal from the first electronic device under the condition that no metal object exists within a preset distance around the first electronic device, wherein the first signal is used for requesting the second electronic device to generate an alternating electromagnetic field with an alternating current signal of a first preset frequency, the first preset frequency is higher than a second preset frequency, and the second preset frequency is the frequency of the alternating current signal for the wireless charging of the electronic device;

the processor responds to the first signal and instructs the charging management module to transmit an alternating current signal of the first preset frequency to the wireless charging coil;

the charging management module converts a direct current signal from the battery into an alternating current signal with a first preset frequency according to the indication of the processor, and transmits the alternating current signal with the first preset frequency to the wireless charging coil;

the wireless charging coil responds to the alternating current signal with the first preset frequency to generate a first alternating electromagnetic field and heat, and the first alternating electromagnetic field acts on a magnetic shielding material of the first electronic device to generate first heat for increasing the cell temperature of the first electronic device;

the processor receiving a second signal from the first electronic device through the wireless charging coil, the second signal for requesting the second electronic device to generate an alternating electromagnetic field with an alternating current electrical signal of the second preset frequency;

the processor responds to the second signal and instructs the charging management module to transmit the alternating current signal of the second preset frequency to the wireless charging coil;

the charging management module converts the direct current signal from the battery into an alternating current signal with a second preset frequency according to the indication of the processor, and transmits the alternating current signal with the second preset frequency to the wireless charging coil;

the wireless charging coil responds to the alternating current signal with the second preset frequency to generate a second alternating electromagnetic field, and the second alternating electromagnetic field acts on the wireless charging coil of the first electronic device and is used for charging the first electronic device.

27. The method of claim 26, further comprising:

the processor receiving a third signal from the first electronic device through the wireless charging coil, the third signal for requesting the second electronic device to generate an alternating electromagnetic field with an alternating current electrical signal at a third preset frequency, the third preset frequency being higher than the first preset frequency;

the processor responds to the third signal and instructs the charging management module to transmit an alternating current signal of the third preset frequency to the wireless charging coil;

the charging management module converts the direct current signal from the battery into an alternating current signal with a third preset frequency according to the indication of the processor, and transmits the alternating current signal with the third preset frequency to the wireless charging coil;

the wireless charging coil responds to the alternating current signal with the third preset frequency to generate a third alternating electromagnetic field, the third alternating electromagnetic field acts on the magnetic shielding material of the first electronic equipment to generate second heat, the second heat is used for increasing the battery core temperature of the first electronic equipment, and the second heat is larger than the first heat.

28. The chip system is characterized in that the chip system is applied to electronic equipment comprising a battery, a charging control module, a wireless charging coil, a charging interface and a memory; the chip system includes one or more interface circuits and one or more processors; the interface circuit and the processor are interconnected through a line; the interface circuit to receive signals from the memory and to send the signals to the processor, the signals including computer instructions stored in the memory; when the processor executes the computer instructions, the processor is specifically configured to perform the following operations:

the processor is used for periodically detecting the cell temperature of the battery if the charging interface is detected to input a direct current signal; determining that the temperature of the battery core is lower than a first temperature threshold, and judging whether metal objects exist in a preset distance around the electronic equipment or not by measuring a Q value of an inductance device, wherein the Q value can be used for representing the voltage oscillation attenuation speed of the inductance device; if the Q value is larger than or equal to a preset threshold value, determining that no metal object exists in the preset distance, and sending a first signal to the wireless charging control module; wherein the first signal is used for instructing the wireless charging control module to transmit an alternating current signal of a first preset frequency to the wireless charging coil, so that the wireless charging coil generates a first alternating electromagnetic field and heat in response to the alternating current signal of the first preset frequency; the first preset frequency is higher than a second preset frequency, and the second preset frequency is the frequency of an alternating current signal for wireless charging of the electronic equipment;

the processor is further configured to send a second signal to the charging control module if it is determined that the cell temperature is higher than the first temperature threshold; the second signal is used for instructing the charging control module to receive the direct current signal input by the charging interface and instructing the charging control module to charge the battery by using the direct current signal input by the charging interface.

29. The chip system is characterized by being applied to electronic equipment comprising a battery, a charging management module, a wireless charging coil, a charging interface and a memory, wherein the electronic equipment is first electronic equipment; the chip system includes one or more interface circuits and one or more processors; the interface circuit and the processor are interconnected through a line; the interface circuit to receive signals from the memory and to send the signals to the processor, the signals including computer instructions stored in the memory; when the processor executes the computer instructions, the processor is specifically configured to perform the following operations:

the processor is configured to periodically detect a cell temperature of the battery after performing wireless charging protocol interaction with a second electronic device through the wireless charging coil, where the second electronic device is configured to wirelessly charge the first electronic device;

the processor is further configured to determine that the cell temperature is lower than a first temperature threshold, and determine whether a metal object is present within a preset distance around the electronic device by measuring a Q value of an inductance device, where the Q value may be used to represent how fast voltage oscillation of the inductance device attenuates; if the Q value is greater than or equal to a preset threshold, determining that no metal object exists within the preset distance, and sending a first signal to the second electronic device through the wireless charging coil, wherein the first signal is used for requesting the second electronic device to generate a first alternating electromagnetic field and heat according to an alternating current signal with a first preset frequency, the first preset frequency is higher than a second preset frequency, the second preset frequency is the frequency of the alternating current signal wirelessly charged by the first electronic device, and a magnetic shielding material induces the first alternating electromagnetic field to generate first heat to raise the temperature of the electric core;

the second alternating electromagnetic field acts on the wireless charging coil, so that the wireless charging coil generates an alternating current signal, and the alternating current signal is used for charging the battery through the charging management module.

30. A chip system is applied to an electronic device comprising a battery, a charging management module, a wireless charging coil and a memory, wherein the electronic device is a second electronic device; the chip system includes one or more interface circuits and one or more processors; the interface circuit and the processor are interconnected through a line; the interface circuit to receive signals from the memory and to send the signals to the processor, the signals including computer instructions stored in the memory; when the processor executes the computer instructions, the processor is specifically configured to perform the following operations:

the processor is configured to receive a first signal from a first electronic device after a wireless charging protocol interaction is performed between the wireless charging coil and the first electronic device, and under the condition that no metal object exists within a preset distance around the first electronic device, the first signal is used to request the second electronic device to generate an alternating electromagnetic field with an alternating current signal of a first preset frequency, where the first preset frequency is higher than a second preset frequency, and the second preset frequency is a frequency of an alternating current signal of the electronic device for wireless charging;

the processor is further configured to instruct, in response to the first signal, the charging management module to transmit an alternating current signal of the first preset frequency to the wireless charging coil; the alternating current signal with the first preset frequency acts on the wireless charging coil to generate a first alternating electromagnetic field and heat, and the first alternating electromagnetic field acts on a magnetic shielding material of the first electronic device to generate first heat for increasing the cell temperature of the first electronic device;

the processor is further configured to instruct the charging management module to transmit an alternating current signal of the second preset frequency to the wireless charging coil in response to the second signal; the alternating current signal with the second preset frequency acts on the wireless charging coil to generate a second alternating electromagnetic field, and the second alternating electromagnetic field acts on the wireless charging coil of the first electronic device and is used for charging the first electronic device.

31. A computer-readable storage medium comprising computer instructions that, when executed on an electronic device, cause the electronic device to perform the method of any of claims 15-27.

32. A computer program product, which, when run on a computer, causes the computer to perform the method of any one of claims 15-27.