WO2020125407A1

WO2020125407A1 - Method and device for detecting internal resistance of battery and method and device for detecting ageing of battery

Info

Publication number: WO2020125407A1
Application number: PCT/CN2019/122783
Authority: WO
Inventors: 姜新
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-12-21
Filing date: 2019-12-03
Publication date: 2020-06-25
Also published as: CN111426969A

Abstract

Disclosed are a method and a device for detecting the internal resistance of a battery and a method and a device for detecting ageing of a battery, wherein the method for detecting the internal resistance of a battery comprises: determining whether a voltage of the battery is greater than or equal to a predetermined voltage threshold and determining whether a temperature of the battery is in a predetermined temperature range (S102); if so, controlling the battery to discharge (S104); calculating the internal resistance of the battery according to a first voltage value of the battery before discharging, a second voltage value of the battery after discharging and a discharge current of the battery (S106). The method solves the problem in which the accuracy of current methods for detecting the internal resistance of a battery is low.

Description

Battery internal resistance detection method and device, battery aging detection method and device

This disclosure requires the priority of the Chinese patent application CN201811573608.8 entitled "Method and device for battery internal resistance detection, method and device for battery aging" filed on December 21, 2018, the entire contents of which are incorporated by reference In this article.

Technical field

The present disclosure relates to the field of battery energy, and in particular to a method and device for detecting battery internal resistance, and a method and device for detecting battery aging.

Background technique

With the development of industrial technology, the battery has become an indispensable part of many electronic or mechanical products. The battery can provide long-lasting electrical energy anytime and anywhere, so that the electronic products can operate normally. During the continuous use of the battery, the internal resistance of the battery will gradually increase, resulting in the aging of the battery and the battery cannot be charged and used normally. If the battery aging information cannot be reported to the user in time to prompt the user to replace the battery in time, it will cause the user to be ineffective Use the battery.

In the current method for detecting the internal resistance of a battery, only the voltage across the battery and the current flowing through the battery are considered to calculate the internal resistance of the battery, which has the problem of poor accuracy in detecting the internal resistance of the battery.

Summary of the invention

The purpose of the embodiments of the present disclosure is to provide a method and device for detecting the internal resistance of a battery, and a method and device for detecting the aging of a battery, so as to solve the problem of poor accuracy of the current method for detecting the internal resistance of a storage battery.

To solve the above technical problems, the embodiments of the present disclosure are implemented as follows:

In a first aspect, an embodiment of the present disclosure provides a method for detecting the internal resistance of a battery. The method includes: determining whether the voltage of the battery is greater than or equal to a preset voltage threshold, and determining whether the temperature of the battery is within a preset temperature range If the voltage of the battery is greater than or equal to the preset voltage threshold, and the temperature of the battery is within the preset temperature range, the battery is controlled to discharge; according to the first voltage before the battery discharge Value, the second voltage value after the battery is discharged, and the discharge current value of the battery, to calculate the internal resistance value of the battery.

In a second aspect, an embodiment of the present disclosure provides a method for detecting battery aging. The method includes: using the method according to any one of the first aspects above, calculating an internal resistance value of the battery N times; where, N It is a positive integer greater than 1; according to each internal resistance value calculated, it is determined whether the battery is aging.

In a third aspect, an embodiment of the present disclosure provides an apparatus for detecting internal resistance of a battery. The apparatus includes: a threshold judgment module for judging whether the voltage of the battery is greater than or equal to a preset voltage threshold, and judging the temperature of the battery Whether it is within a preset temperature range; a battery discharge module, used to control the battery if the voltage of the battery is greater than or equal to the preset voltage threshold, and the temperature of the battery is within the preset temperature range Discharge; the internal resistance calculation module is used to calculate the internal resistance value of the battery based on the first voltage value before the battery discharge, the second voltage value after the battery discharge, and the discharge current value of the battery.

According to a fourth aspect, an embodiment of the present disclosure provides a device for detecting battery aging. The device includes: an internal resistance calculation module for multiple times, which is used for the device according to any one of the above third aspects to calculate the battery N times Internal resistance value; wherein, N is a positive integer greater than 1; a battery aging judgment module is used to determine whether the battery is aging according to each of the calculated internal resistance values.

According to a fifth aspect, an embodiment of the present disclosure provides an electronic device, which includes a memory, a processor, and a computer program operable on the memory and the processor, the computer program being used by the processor When executed, the method for detecting the internal resistance of the battery according to any one of the above first aspects is implemented.

According to a sixth aspect, an embodiment of the present disclosure provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, it is implemented as any of the above-mentioned first aspects A method for detecting the internal resistance of a battery.

According to a seventh aspect, an embodiment of the present disclosure provides an electronic device, which includes a memory, a processor, and a computer program that can run on the memory, and the computer program is used by the processor When executed, the method for detecting battery aging described in any one of the second aspects above is implemented.

In an eighth aspect, an embodiment of the present disclosure provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, implemented as any one of the second aspect above A method for battery aging detection.

BRIEF DESCRIPTION

The drawings described herein are used to provide a further understanding of the present disclosure and form a part of the present disclosure. The exemplary embodiments and descriptions of the present disclosure are used to explain the present disclosure and do not constitute an undue limitation on the present disclosure. In the drawings:

1 is a schematic flowchart of a method for detecting battery internal resistance provided by an embodiment of the present disclosure;

2 is a schematic flowchart of a battery aging detection method according to an embodiment of the present disclosure;

3 is a schematic circuit diagram of a battery internal resistance detection system provided by an embodiment of the present disclosure;

4 is a schematic flowchart of a battery aging detection method provided in another embodiment of the present disclosure;

5 is a schematic block diagram of a device for detecting battery internal resistance provided by an embodiment of the present disclosure;

6 is a schematic block diagram of a battery aging detection device according to an embodiment of the present disclosure;

7 is a schematic diagram of module composition of an electronic device according to an embodiment of the present disclosure.

detailed description

The technical solutions in the embodiments of the present disclosure will be described clearly and completely in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

FIG. 1 is a schematic flowchart of a method for detecting internal resistance of a battery according to an embodiment of the present disclosure. As shown in FIG. 1, the process includes the following steps: Step S102, determining whether the battery voltage is greater than or equal to a preset voltage threshold, and, Determine whether the battery temperature is within the preset temperature range; Step S104, if the battery voltage is greater than or equal to the preset voltage threshold, and the battery temperature is within the preset temperature range, then control the battery discharge; Step S106, according to the battery before discharge The first voltage value of the battery, the second voltage value after the battery is discharged, and the discharge current value of the battery are used to calculate the internal resistance value of the battery.

In the embodiment of the present disclosure, it is determined whether the voltage of the battery is equal to the preset voltage threshold, and whether the temperature of the battery is within the preset temperature range, if the battery voltage is greater than or equal to the preset voltage threshold, and the temperature of the battery is at the preset temperature Within the range, the battery discharge is controlled, and the internal resistance value of the battery is calculated according to the first voltage value before the battery discharge, the second voltage value after the battery discharge, and the discharge current value of the battery. After it is determined that the battery voltage is greater than or equal to the preset voltage threshold, and the battery temperature is within the preset temperature range, the battery is controlled to discharge to perform internal resistance detection, which can ensure that the battery internal resistance is detected at the appropriate voltage and appropriate temperature, thereby improving The accuracy of detecting the internal resistance of the battery.

In the above steps S102 to S104, it is determined whether the voltage of the battery is greater than or equal to the preset voltage threshold, and whether the temperature of the battery is within the preset temperature range. If the voltage of the battery is greater than or equal to the preset voltage threshold, and the temperature of the battery is within the preset temperature range, the battery is controlled to discharge.

In this embodiment, the preset voltage threshold and the preset temperature range of the battery are determined according to the actual battery type and material. In one implementation, when the internal resistance of the nickel-hydrogen battery is tested, when the nickel-hydrogen battery is connected to the circuit, nickel is detected The voltage of the hydrogen battery is greater than or equal to 4V, and the temperature of the nickel-hydrogen battery is detected to be within 0-60 degrees, then the battery is controlled to discharge.

In the above step S106, the internal resistance value of the battery is calculated based on the first voltage value before the battery is discharged, the second voltage value after the battery is discharged, and the discharge current value of the battery.

In the embodiment of the present disclosure, controlling battery discharge includes: controlling the battery to perform constant current discharge at a preset current value, and controlling the discharge duration of the battery to a preset duration.

In this embodiment, the preset current may be set to be greater than or equal to 300 mA, or may be set to other values, which is not limited here. The preset duration can be set to 0.5s according to the material of the actual battery, or can be set to other values, which is not limited here.

In one embodiment, in an embodiment of the present disclosure, the internal resistance value of the battery is calculated according to the first voltage value before the battery discharge, the second voltage value after the battery discharge, and the discharge current value of the battery, including: (a1), Calculate the voltage difference between the first voltage value and the second voltage value; (a2), determine the ratio between the voltage difference value and the discharge current value as the internal resistance value of the battery.

In the above operations (a1) to (a2), by calculating the voltage difference between the first voltage value and the second voltage value, the ratio between the voltage difference and the discharge current value is determined as the internal resistance value of the battery .

In one embodiment, the embodiment of the present disclosure further includes: if it is determined that the battery voltage is less than the preset voltage threshold, charging the battery, and repeatedly performing the step of determining whether the battery voltage is greater than or equal to the preset voltage threshold.

In this embodiment, if it is determined that the voltage of the battery is less than the preset voltage threshold, it means that the battery power is insufficient. The measurement of the internal resistance of the battery requires the highest test accuracy under the normal working environment of the battery. Therefore, the battery needs to be charged to ensure the measurement of the internal resistance of the battery The data accuracy is high. After the charging is completed, the step of determining whether the voltage of the battery is greater than or equal to the preset voltage threshold is repeatedly performed. In a preferred embodiment, the step of determining whether the voltage of the battery is greater than or equal to the preset voltage threshold is repeatedly performed after charging the battery for half an hour.

FIG. 2 is a schematic flow chart of a method for detecting battery aging according to an embodiment of the present disclosure. As shown in FIG. 2, the flow includes the following steps: Step S202, using the above-described method for detecting the internal resistance of a battery, to calculate N batteries The internal resistance value; where, N is a positive integer greater than 1; Step S204, according to each internal resistance value calculated to determine whether the battery is aging.

In the embodiments of the present disclosure, using the above method for detecting the internal resistance of the battery, after determining that the voltage of the battery is greater than or equal to the preset voltage threshold, and after the temperature of the battery is within the preset temperature range, the battery is controlled to discharge to perform internal resistance detection, which can ensure Detect the internal resistance of the battery at the appropriate voltage and temperature, thereby improving the accuracy of detecting the internal resistance of the battery. In this way, the internal resistance value of the N times battery is calculated, and whether the battery is aging is determined according to the calculated internal resistance values, thereby improving the accuracy of detecting battery aging.

In the above steps S202 to S204, the internal resistance value of the N-time battery is calculated using the above-mentioned method for detecting the internal resistance of the battery, where N is a positive integer greater than 1, and whether the battery is degraded according to the calculated internal resistance values .

In one embodiment, in the embodiment of the present disclosure, determining whether the battery is aging according to the calculated internal resistance values includes: (a1) determining the battery aging internal resistance threshold corresponding to each internal resistance value; (a2), If the ratio of the number of internal resistance values greater than the corresponding battery aging internal resistance threshold to the total number of internal resistance values in each internal resistance value is greater than or equal to the set ratio, it is determined that the battery is aging, otherwise, it is determined that the battery is not aging.

In the above actions (a1) to (a2), determine the battery aging internal resistance threshold corresponding to each internal resistance value. If each internal resistance value, the number of internal resistance values greater than the corresponding battery aging internal resistance threshold accounts for the total internal resistance If the ratio of the number of values is greater than or equal to the set ratio, it is determined that the battery is aging, otherwise, it is determined that the battery is not aging. The setting ratio can be set to 70% or other values, which is not limited here. For example, among the calculated 10 sets of battery internal resistance values, among the 10 sets of calculated internal resistance values, there are 8 sets of internal resistance values greater than the corresponding battery aging internal resistance threshold, which is greater than or equal to the set ratio of 70% The condition of the battery determines the battery aging.

In the embodiment of the present disclosure, determining the battery aging internal resistance threshold corresponding to each internal resistance value includes: (b1), respectively obtaining the temperature value of the battery corresponding to each internal resistance value; wherein, the battery temperature corresponding to the internal resistance value The value is the temperature value of the battery when calculating the internal resistance; (b2), in the correspondence between the preset battery temperature and the battery aging internal resistance threshold, find the corresponding battery aging internal resistance threshold for each temperature value obtained (B3), the battery aging internal resistance threshold corresponding to each temperature value is determined as the battery aging internal resistance threshold corresponding to each internal resistance value.

In the above actions (b1) to (b3), the temperature values of the batteries corresponding to the respective internal resistance values are obtained; wherein, the temperature value of the battery corresponding to the internal resistance value is the temperature value of the battery when calculating the internal resistance value, which is In the correspondence between the battery temperature and the battery aging internal resistance threshold, find the battery aging internal resistance threshold corresponding to each temperature value obtained, and determine the battery aging internal resistance threshold corresponding to each temperature value as each internal resistance The value corresponds to the battery aging internal resistance threshold. In a practical situation, the corresponding battery internal resistance at each temperature is different, so determining the corresponding battery aging internal resistance threshold at different temperatures can improve the accuracy of detecting battery aging.

In this embodiment, the step of separately acquiring the temperature values of the batteries corresponding to the respective internal resistance values may be whether the battery temperature is within the preset temperature range in the above method, and if the battery temperature is within the preset temperature range The internal resistance value corresponds to the temperature value of the battery.

Table 1 is a schematic table of the temperature value corresponding to the battery aging internal resistance threshold provided by an embodiment of the present disclosure, as shown in Table 1, wherein the initial value is the internal resistance value at the corresponding temperature when the battery is shipped from the factory, and the aging internal resistance threshold is The internal resistance threshold value R1 at the corresponding temperature when the battery is aging, the internal resistance value of the actual battery measured at the corresponding temperature is R2, and the aging internal resistance threshold value corresponding to the internal resistance value R2 of the actual battery is found in the corresponding temperature value in Table 1. R1, compare the size of R1 and R2, if in the N group test comparison results (where N is an integer greater than 1), the number of groups with R2 greater than R1 to the total number of N groups is greater than or equal to the preset ratio, then judge the battery Ageing.

Table 1

In one embodiment, when the battery is detected to be aged, the user will be prompted to replace the battery to prevent the user from inconvenience caused by the battery not being used normally. For example, when the battery of an automobile is aging, the user can be notified through a dashboard or screen to replace the battery in time.

In the embodiment of the present disclosure, the above battery includes a nickel-metal hydride battery.

FIG. 3 is a schematic circuit diagram of a battery internal resistance detection system according to an embodiment of the present disclosure. As shown in FIG. 3, the circuit diagram includes three parts:

The first part is: the battery terminal uses a nickel-metal hydride battery, the battery lead has three Vbat, GND (ground, ground terminal), NTC (Negative Temperature Coefficient, thermistor). The Vbat terminal is the positive voltage of the battery, Vbat is used for battery voltage detection, the GND terminal is the negative electrode of the battery, NTC is the battery temperature detection pin, and the NTC is connected to the negative temperature coefficient thermistor to ground. V1 is used to power the entire system. S1 is the battery voltage detection switch. When the battery voltage needs to be detected, S1 is closed by software control. Vbat_ADC starts to detect the battery voltage. When not in use, S1 is disconnected. The battery voltage is not detected and reduced. Leakage current. S1 can be a tertiary tube or a MOSS tube, which can be switched on and off by software to detect the battery voltage.

This part requires that the Vbat leads should be led directly from the battery socket, not from the rear end of V1. The shorter the lead, the better, so as to avoid introducing the impedance of the wiring into the battery internal resistance detection during the internal resistance calculation, resulting in a larger internal resistance error.

The second part is the MCU (Microcontroller Unit, micro control unit) control terminal, Vbat_ADC is the battery voltage detection, GPIO_1 is a constant current source control pin, which controls the battery current to be output in a constant current mode to achieve battery discharge. In order to detect accuracy, the discharge current of the battery must be at least 300mA, and the discharge current of the battery can be set to 1000mA. NTC_ADC is the battery temperature detection pin, which is converted to a temperature value by collecting the NTC partial pressure value and corresponding to the NTC V-T meter. The V-T table is the temperature value of the battery at different voltages measured at the time of delivery.

The third part is the external circuit. R1 and R2 form the battery voltage divider to the MCU's ADC (Analog-to-Digital Converter) to collect the battery voltage. The switch controls the battery voltage collection to turn on the detection when needed. Reduce leakage. When the battery is discharged, it outputs a constant current to facilitate the calculation of the battery's internal resistance. R3 is the NTC temperature-collecting pull-up resistor and the NTC inside the battery to form a voltage divider circuit for the MCU ADC to collect the voltage divider value at different temperatures, and check the V-T table for the corresponding temperature value.

The selection of R1 and R2 values is determined according to the MCU ADC pin acquisition voltage range. For example, the maximum acquisition value of the MCU ADC is 3.3V, then the voltage division value of R2 to the battery should be less than 3.3V. It is best to reserve a certain value margin.

The pull-up power supply of VCC is basically the same as the power supply of the MCU. The resistance of R3 should be determined according to the resistance range of NTC at different temperatures and the pull-up level of VCC. On the one hand, it is necessary to ensure that the level after voltage division is within the detection range of the ADC; on the other hand, it is necessary to ensure that the temperature range that can be read is within the limit temperature of the product's work and storage. For example, the working temperature of the battery is -20 ~ 85 degrees working range, and the voltage value collected by NTC_ADC can be checked in the V-T table to correspond to the -20 ~ 85 degree working range.

FIG. 4 is a schematic flowchart of a battery aging detection method provided in another embodiment of the present disclosure. In this figure, the battery is a nickel-metal hydride battery. As shown in FIG. 4: in step S402, it is determined whether the battery voltage is greater than or equal to the preset voltage threshold; if so, step S406 is executed; if not, step S404 is executed; in step S404, the battery is charged and returns to step S402; step S406, Determine whether the temperature of the battery is within the preset temperature range; if it is, perform step S410, if not, perform step S408; step S408, stop the detection of the internal resistance of the battery; step S410, obtain the voltage V1 and temperature T1 before discharge, and The battery performs constant current discharge at a preset current value I within a preset duration; step S412, obtains the discharged voltage V2; step S414, calculates the battery internal resistance R2 = (V1-V2)/I by the formula; step S416, passes The temperature T1 corresponding to R2 finds the battery aging internal resistance threshold R1 at the temperature T1, and compares the sizes of R1 and R2; Step S418, obtains the calculated battery internal resistance R2 of the N groups and the corresponding R1, and judges that the number of groups with R2 greater than R1 Whether the ratio of all N groups is greater than or equal to the set ratio; if yes, perform step S420, if not, perform step S422; step S420, determine that the battery is aging and prompt the user to replace the battery; step S422, determine that the battery is not aging.

In the embodiment of the present disclosure, it is determined whether the voltage of the battery is equal to the preset voltage threshold, and whether the temperature of the battery is within the preset temperature range, if the battery voltage is greater than or equal to the preset voltage threshold, and the temperature of the battery is at the preset temperature Within the range, the battery discharge is controlled, and the internal resistance value of the battery is calculated according to the first voltage value before the battery discharge, the second voltage value after the battery discharge, and the discharge current value of the battery. After it is determined that the battery voltage is greater than or equal to the preset voltage threshold, and the battery temperature is within the preset temperature range, the battery is controlled to discharge to perform internal resistance detection, which can ensure that the battery internal resistance is detected at the appropriate voltage and appropriate temperature, thereby improving The accuracy of detecting the internal resistance of the battery and the accuracy of detecting the aging of the battery.

FIG. 5 is a schematic block diagram of a device for detecting internal resistance of a battery according to an embodiment of the present disclosure. As shown in FIG. 5, the device includes: a threshold judgment module 51 for judging whether the battery voltage is greater than or equal to a preset voltage threshold And, determine whether the temperature of the battery is within a preset temperature range; a battery discharge module 52 is used if the voltage of the battery is greater than or equal to the preset voltage threshold, and the temperature of the battery is in the Within the temperature range, the battery is controlled to discharge; the internal resistance calculation module 53 is used to determine the first voltage value before the battery discharge, the second voltage value after the battery discharge, and the discharge current value of the battery To calculate the internal resistance of the battery.

In one embodiment, the battery discharge module 52 is configured to: control the battery to perform constant current discharge at a preset current value, and control the discharge duration of the battery to be a preset duration.

In one embodiment, the internal resistance calculation module 53 is used to: calculate the voltage difference between the first voltage value and the second voltage value; and compare the voltage difference value with the discharge current value The ratio between them is determined as the internal resistance of the battery.

In one embodiment, the device further includes: a battery charging module, configured to charge the battery if it is determined that the voltage of the battery is less than the preset voltage threshold, and repeatedly execute to determine whether the voltage of the battery is greater than Steps equal to the preset voltage threshold.

FIG. 6 is a schematic block diagram of a battery aging detection device according to an embodiment of the present disclosure. As shown in FIG. 6, the device includes: a multiple-calculation internal resistance module 61, which is used to utilize any of the above battery internal resistance detection devices The method in the device described in item 1, calculates the internal resistance value of the battery N times; wherein, N is a positive integer greater than 1; a battery aging judgment module 62 is used to calculate each internal resistance value according to the calculation, Determine whether the battery is aging.

In one embodiment, the battery aging judgment module 62 is used to: determine the battery aging internal resistance threshold corresponding to each of the internal resistance values; if each of the internal resistance values is greater than the corresponding battery aging internal resistance If the ratio of the number of threshold internal resistance values to all the internal resistance values is greater than or equal to the set ratio, it is determined that the battery is aging, otherwise, it is determined that the battery is not aging.

In one embodiment, the battery aging judgment module 62 is further configured to: determine a battery aging internal resistance threshold corresponding to each of the internal resistance values, and obtain the temperature value of the battery corresponding to each of the internal resistance values, respectively ; Wherein the temperature value of the battery corresponding to the internal resistance value is the temperature value of the battery when calculating the internal resistance value; in the correspondence between the preset battery temperature and the battery aging internal resistance threshold, Finding the battery aging internal resistance threshold corresponding to each of the obtained temperature values; determining the battery aging internal resistance threshold corresponding to each of the temperature values as the battery aging internal resistance threshold corresponding to each of the internal resistance values.

In one embodiment, the battery includes a nickel-metal hydride battery.

Corresponding to the method for detecting the internal resistance of the battery and the method for detecting the aging of the battery provided in the embodiments of the present disclosure, an embodiment of the present disclosure provides an electronic device, as shown in FIG. 7, the electronic device includes a processor 710, a transceiver 720, and a memory 730 And bus interface. among them:

In the embodiment of the present disclosure, the electronic device further includes: a computer program stored on the memory 730 and executable on the processor 710, and the computer program is executed by the processor 710 to implement the above-mentioned battery internal resistance detection The various processes in the method embodiments can achieve the same technical effect, and in order to avoid repetition, they will not be repeated here.

Of course, when the computer program is executed by the processor 710, each process in the above-mentioned battery aging detection method embodiment can be achieved, and the same technical effect can be achieved. To avoid repetition, details are not described here.

In FIG. 7, the bus architecture may include any number of interconnected buses and bridges, and one or more processors represented by the processor 710 and various circuits of the memory represented by the memory 730 are linked together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, and therefore, they will not be further described in this article. The bus interface provides an interface. The transceiver 720 may be a plurality of elements, including a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium.

The processor 710 is responsible for managing the bus architecture and general processing, and the memory 730 may store data used by the processor 710 in performing operations.

Embodiments of the present disclosure also provide a computer-readable storage medium that stores a computer program on the computer-readable storage medium. When the computer program is executed by a processor, each process of the foregoing method embodiment of battery internal resistance detection is implemented, and can achieve The same technical effect will not be repeated here to avoid repetition.

Of course, when the computer program is executed by the processor, the processes of the foregoing battery aging detection method embodiments can be achieved, and the same technical effect can be achieved. To avoid repetition, details are not described here.

Wherein, the computer-readable storage medium, such as read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

It should be noted that in this article, the terms "include", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, It also includes other elements that are not explicitly listed, or include elements inherent to this process, method, article, or device. Without more restrictions, the element defined by the sentence "include one..." does not exclude that there are other identical elements in the process, method, article or device that includes the element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods in the above embodiments can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware, but in many cases the former is better Implementation. Based on such an understanding, the technical solution of the present disclosure can be embodied in the form of a software product in essence or part that contributes to the existing technology, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, The CD-ROM includes several instructions to enable a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or an electronic device, etc.) to perform the methods described in various embodiments of the present disclosure.

The embodiments of the present disclosure have been described above with reference to the drawings, but the present disclosure is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only schematic and not restrictive. Those of ordinary skill in the art Inspired by this, many forms can be made without departing from the purpose of the present disclosure and the scope of protection of the claims, all of which fall within the protection of the present disclosure.

Claims

A method for detecting the internal resistance of a battery, wherein the method includes:

Judging whether the voltage of the battery is greater than or equal to the preset voltage threshold, and judging whether the temperature of the battery is within the preset temperature range;

If the voltage of the battery is greater than or equal to the preset voltage threshold, and the temperature of the battery is within the preset temperature range, the battery is controlled to discharge;

The internal resistance value of the battery is calculated according to the first voltage value before the battery discharge, the second voltage value after the battery discharge, and the discharge current value of the battery.
The method of claim 1, wherein controlling the battery to discharge includes:

Controlling the battery to perform constant current discharge at a preset current value, and controlling the discharge duration of the battery to a preset duration.
The method according to claim 1 or 2, wherein the internal voltage of the battery is calculated based on the first voltage value before the battery discharge, the second voltage value after the battery discharge, and the discharge current value of the battery Resistance, including:

Calculating a voltage difference between the first voltage value and the second voltage value;

The ratio between the voltage difference and the discharge current value is determined as the internal resistance value of the battery.
The method according to claim 1 or 2, wherein the method further comprises:

If it is determined that the voltage of the battery is less than the preset voltage threshold, the battery is charged, and the step of determining whether the voltage of the battery is greater than or equal to the preset voltage threshold is repeatedly performed.
A battery aging detection method, wherein the method includes:

Use the method of any one of claims 1 to 4 to calculate the internal resistance of the battery N times; where N is a positive integer greater than 1;

According to the calculated internal resistance values, it is determined whether the battery is aging.
The method according to claim 5, wherein determining whether the battery is aging according to each of the calculated internal resistance values includes:

Determine the battery aging internal resistance threshold corresponding to each of the internal resistance values;

If in each of the internal resistance values, the ratio of the number of internal resistance values greater than the corresponding battery aging internal resistance threshold to the total number of internal resistance values is greater than or equal to the set ratio, the battery aging is determined, otherwise To determine that the battery is not aging.
The method according to claim 6, wherein determining the battery aging internal resistance threshold corresponding to each of the internal resistance values includes:

Separately obtaining the temperature value of the battery corresponding to each of the internal resistance values; wherein, the temperature value of the battery corresponding to the internal resistance value is the temperature value of the battery when calculating the internal resistance value;

Searching the corresponding relationship between the preset battery temperature and the battery aging internal resistance threshold to find the battery aging internal resistance threshold corresponding to each of the obtained temperature values;

The battery aging internal resistance threshold corresponding to each of the temperature values is determined as the battery aging internal resistance threshold corresponding to each of the internal resistance values.
The method according to any one of claims 5 to 7, wherein the battery comprises a nickel-metal hydride battery.
A device for detecting internal resistance of a battery, wherein the device comprises:

A threshold judgment module, used to judge whether the voltage of the battery is greater than or equal to the preset voltage threshold, and judge whether the temperature of the battery is within the preset temperature range;

A battery discharge module, configured to control the battery to discharge if the voltage of the battery is greater than or equal to the preset voltage threshold, and the temperature of the battery is within the preset temperature range;

The internal resistance calculation module is configured to calculate the internal resistance value of the battery based on the first voltage value before the battery discharge, the second voltage value after the battery discharge, and the discharge current value of the battery.
The device according to claim 9, wherein the battery discharge module is used to:

Controlling the battery to perform constant current discharge at a preset current value, and controlling the discharge duration of the battery to a preset duration.
The device according to claim 9 or 10, wherein the internal resistance calculation module is used to:

Calculating a voltage difference between the first voltage value and the second voltage value;

The ratio between the voltage difference and the discharge current value is determined as the internal resistance value of the battery.
The device according to claim 9 or 10, wherein the device further comprises:

The battery charging module is configured to charge the battery if it is determined that the voltage of the battery is less than the preset voltage threshold, and repeatedly perform the step of determining whether the battery voltage is greater than or equal to the preset voltage threshold.
A battery aging detection device, wherein the device includes:

The internal resistance calculation module is used multiple times to calculate the internal resistance value of the battery N times using the device according to any one of claims 9 to 12; where N is a positive integer greater than 1;

The battery aging judgment module is used to judge whether the battery is aging according to the calculated internal resistance values.
The device according to claim 13, wherein the battery aging judgment module is configured to:

Determine the battery aging internal resistance threshold corresponding to each of the internal resistance values;

If in each of the internal resistance values, the ratio of the number of internal resistance values greater than the corresponding battery aging internal resistance threshold to the total number of internal resistance values is greater than or equal to the set ratio, the battery aging is determined, otherwise To determine that the battery is not aging.
The apparatus according to claim 14, wherein the battery aging judgment module is further used to:

Separately obtaining the temperature value of the battery corresponding to each of the internal resistance values; wherein, the temperature value of the battery corresponding to the internal resistance value is the temperature value of the battery when calculating the internal resistance value;

Searching the corresponding relationship between the preset battery temperature and the battery aging internal resistance threshold to find the battery aging internal resistance threshold corresponding to each of the obtained temperature values;

The battery aging internal resistance threshold corresponding to each of the temperature values is determined as the battery aging internal resistance threshold corresponding to each of the internal resistance values.
The device according to any one of claims 13 to 15, wherein the battery comprises a nickel-metal hydride battery.
An electronic device, including a memory, a processor, and a computer program on the memory and executable on the processor, when the computer program is executed by the processor, any one of claims 1-4 is implemented The method for detecting the internal resistance of the battery as described in item
A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the battery internal resistance detection according to any one of claims 1-4 is implemented Methods.
An electronic device, including a memory, a processor, and a computer program that can run on the memory and the processor, when the computer program is executed by the processor, any of claims 5-8 is implemented A method for battery aging detection.
A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and the computer program is executed by a processor to implement the battery aging detection according to any one of claims 5-8 method.