CN115864575A

CN115864575A - Charging and discharging circuit, battery pack, terminal device and charging control method

Info

Publication number: CN115864575A
Application number: CN202211527600.4A
Authority: CN
Inventors: 廖志君
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-03-28

Abstract

The present disclosure relates to a charge and discharge circuit, a battery pack, a terminal device, and a charge control method, the charge and discharge circuit including: the charging and discharging control circuit is connected between a positive charging end of the charging and discharging circuit and a negative charging end of the charging and discharging circuit, is connected with the battery module and is used for controlling charging and discharging of the battery module; and the heating module is positioned outside the battery module, is connected with the charging and discharging control circuit and is used for generating heat when the charging and discharging control circuit controls the charging and discharging of the battery module. The embodiment of the disclosure can simultaneously improve the internal and external temperatures of the battery module, thereby improving the heating efficiency of the battery module, shortening the charging time, further realizing the function of quick charging under the low-temperature environment, and expanding the use scene of the battery module.

Description

Charging and discharging circuit, battery pack, terminal device and charging control method

Technical Field

The disclosure relates to the field of batteries, and in particular to a charging and discharging circuit, a battery pack, a terminal device and a charging control method.

Background

The battery cannot realize high-rate charging due to the chemical characteristics of the battery in a low-temperature environment, and meanwhile, the internal resistance of the battery in the low-temperature environment is increased, so that the discharge capacity of the battery is reduced, and the use efficiency is also reduced. The battery application usually avoids rapid charging and discharging in a low temperature environment to ensure the safety and the service life of the battery, but this also limits the service environment of the battery. At present, under a low-temperature environment, a battery is generally charged after being heated by an external heating mode. However, external heating has the problem of uneven temperature conduction, and the heating efficiency is low, resulting in a long charging time and affecting the user experience.

Disclosure of Invention

In order to overcome the problems in the related art, the charging and discharging circuit, the battery assembly, the terminal device and the charging control method provided by the disclosure can simultaneously increase the internal and external temperatures of the battery module, thereby increasing the heating efficiency of the battery module, shortening the charging time, further realizing the function of quick charging in a low-temperature environment, and expanding the use scene of the battery module.

According to a first aspect of the embodiments of the present disclosure, there is provided a charging and discharging circuit, at least including:

the charging and discharging control circuit is connected between a positive charging end of the charging and discharging circuit and a negative charging end of the charging and discharging circuit, is connected with the battery module and is used for controlling charging and discharging of the battery module;

and the heating module is positioned outside the battery module, is connected with the charging and discharging control circuit and is used for generating heat when the charging and discharging control circuit controls the charging and discharging of the battery module.

In some embodiments, the charge and discharge control circuit includes: a charge control circuit and a discharge control circuit, wherein,

the charging control circuit is connected with the positive charging end and the negative charging end and is used for controlling the charging of the battery module;

the discharge control circuit is connected with the positive charging end and the negative charging end and is used for controlling the discharge of the battery module;

the heating module is connected in series on the discharge control circuit and used for generating the heat when the discharge control circuit performs discharge control on the battery module.

In some embodiments, the charging and discharging circuit further comprises: a control end and a locking end;

the charging control circuit is connected with the control end and the locking end and is used for controlling the charging of the battery module based on the signal output by the control end and the signal output by the locking end;

and the discharge control circuit is connected with the control end and the locking end and is used for controlling the discharge of the battery module based on the signal output by the control end and the signal output by the locking end.

In some embodiments, the charge control circuit comprises a first op amp chip; the discharge control circuit comprises a second operational amplifier chip;

the reverse-phase input end of the second operational amplifier chip is connected with the non-phase input end of the first operational amplifier chip;

the control end and the locking end are both connected with the inverting input end of the second operational amplifier chip.

In some embodiments, the charge control circuit further comprises a first transistor, wherein,

the grid electrode of the first transistor is connected with the output end of the first operational amplifier chip, the source electrode of the first transistor is connected with the positive charging end, and the drain electrode of the first transistor is connected with the heating module and the battery module;

when the signal output by the locking end is a low level signal and the signal output by the control end is a high level signal, the first operational amplifier chip can control the first transistor to be conducted, so that the battery module is in a charging state.

In some embodiments, the discharge control circuit further comprises:

a second transistor, wherein,

the grid electrode of the second transistor is connected with the output end of the second operational amplifier chip, the source electrode of the second transistor is connected with the negative charging end, and the drain electrode of the second transistor is connected with the heating module;

the signal output by the locking end and the signal output by the control end are both low-level signals; or when the signal output by the locking end is a high-level signal, the second operational amplifier chip can control the second transistor to be conducted, so that the battery module is in a discharging state.

In some embodiments, the inverting input of the first op amp chip is connected to the same reference voltage node as the non-inverting input of the second op amp chip.

In some embodiments, the charge control circuit further comprises:

a third transistor, a first unidirectional conducting device and a first resistor module, wherein,

the grid electrode of the third transistor is connected with the output end of the first operational amplifier chip, the drain electrode of the third transistor is connected with the grid electrode of the first transistor, and the source electrode of the third transistor is connected with the negative charging end;

the first unidirectional conducting piece is connected between the first transistor and the positive electrode of the battery module in series;

the first resistor module is connected with the first transistor and the third transistor.

In some embodiments, the discharge control circuit further comprises:

a second unidirectional conducting element and a fourth transistor, wherein,

the second unidirectional conducting piece is connected with the inverting input end of the second operational amplifier chip;

the grid electrode of the fourth transistor is connected with the locking end, the source electrode of the fourth transistor is connected with the negative charging end, and the drain electrode of the fourth transistor is connected with the second one-way conduction piece.

In some embodiments, the discharge control circuit further comprises:

a third one-way conductive element and a second resistor module, wherein,

the third one-way conduction piece is connected in series on the line where the heating module is located;

the second resistor module is connected with the fourth transistor, the inverted input end of the second operational amplifier chip and the output end of the second operational amplifier chip.

In some embodiments, the charging and discharging circuit further comprises: a reference power supply circuit, wherein,

the reference power circuit is connected with the charging control circuit and the discharging control circuit and used for providing working voltage for the charging control circuit and the discharging control circuit.

In some embodiments, the reference power supply circuit comprises:

the voltage-stabilizing circuit comprises a first voltage-dividing module, a controllable voltage-stabilizing source chip, a second voltage-dividing module and a capacitor module;

the first voltage division module is connected between the positive charging end and the negative charging end in parallel and used for dividing the voltage between the positive charging end and the negative charging end;

the controllable voltage-stabilizing source chip is connected in parallel with two ends of the first voltage-dividing module, is connected with the charging control circuit and the discharging control circuit, and is used for providing working voltage for the charging control circuit and the discharging control circuit;

the second voltage division module is connected in parallel at two ends of the controllable voltage stabilization source chip, connected with the ends of the charging control circuit and the discharging control circuit and used for providing the same reference voltage for the charging control circuit and the discharging control circuit;

and the capacitor module is connected in parallel at two ends of the controllable voltage-stabilizing source chip and is used for stabilizing the voltage at two ends of the controllable voltage-stabilizing source chip.

According to a second aspect of embodiments of the present disclosure, there is provided a battery assembly including:

a battery module;

the charging and discharging circuit according to the first aspect of the present invention is connected to the battery module; the positive charging end of the charging and discharging circuit is connected with the positive pole of the battery module, and the negative charging end of the charging and discharging circuit is connected with the negative pole of the battery module.

According to a third aspect of the embodiments of the present disclosure, there is provided a terminal device, including:

a charging interface;

in the battery module according to the second aspect, a positive charging end of the battery module is connected to a positive interface of the charging interface, and a negative charging end of the charging and discharging circuit is connected to a negative interface of the charging interface.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

the charge and discharge circuit of the disclosed embodiment comprises: the charging and discharging control circuit is connected between a positive charging end of the charging and discharging circuit and a negative charging end of the charging and discharging circuit, is connected with the battery module and is used for controlling charging and discharging of the battery module; and the heating module is positioned outside the battery module, is connected with the charging and discharging control circuit and is used for generating heat when the charging and discharging control circuit controls the charging and discharging of the battery module. That is to say, this disclosed embodiment both can promote the inside temperature of battery module through carrying out charge-discharge control to the battery module, can also promote the outside temperature of battery module through the heat that the heating module produced, so, can promote the inside and outside temperature of battery module simultaneously to promote the heating efficiency of battery module, shorten the charge time, and then can realize the function of quick charge under low temperature environment, expanded the use scene of battery module.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a first schematic diagram of a charging and discharging circuit according to an exemplary embodiment.

Fig. 2 is a schematic diagram of a charge and discharge circuit shown in fig. 2 according to an exemplary embodiment.

Fig. 3 is a third schematic diagram of a charging and discharging circuit according to an exemplary embodiment.

Fig. 4 is a fourth charge and discharge circuit schematic shown in accordance with an exemplary embodiment.

Fig. 5 is a schematic diagram of a charge and discharge circuit shown in accordance with an exemplary embodiment.

Fig. 6 is a block diagram illustrating a terminal device structure according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The disclosed embodiment provides a charge and discharge circuit, as shown in fig. 1, the charge and discharge circuit includes:

the charging and discharging control circuit 10 is connected between a positive charging end 20 of the charging and discharging circuit and a negative charging end 30 of the charging and discharging circuit, is connected with a battery module 40, and is used for controlling charging and discharging of the battery module 40;

and the heating module 50 is located outside the battery module 40, is connected to the charge and discharge control circuit 10, and is used for generating heat when the charge and discharge control circuit 10 performs charge and discharge control on the battery module 40.

In the embodiment of the present disclosure, the charging and discharging circuit is used in a Battery Management System (BMS), and when the BMS controls charging of the Battery module, the charging rate is low and the charging rate is low due to low temperature. The charge-discharge control circuit of this disclosed embodiment can carry out the internal and external heating to the battery module simultaneously earlier before BMS carries out charge control to the battery module, promotes the temperature of battery module, with the BMS cooperation, can promote the multiplying power that charges of battery module under the low temperature environment, promotes charge efficiency.

In the embodiment of the disclosure, the charging and discharging control circuit can realize pulse charging and discharging of the battery module by performing charging and discharging control on the battery module, wherein charging current and discharging current generated by the pulse charging and discharging enter the inside of the battery module and generate heat through internal impedance so as to improve the internal temperature of the battery module.

It should be noted that the charge and discharge control circuit is connected to the charging power source through the positive charging terminal and the negative charging terminal, and the charging current generated by the charging power source flows into the positive electrode of the battery module under the control of the charge and discharge control circuit, then flows through the impedance inside the battery module, and finally flows out from the negative electrode of the battery module.

In the embodiment of the present disclosure, the heating module is located outside the battery module, and here, the heating module may be wrapped outside the battery module, and the temperature outside the battery module is raised by the generated heat.

In the embodiment of the disclosure, the heating module is connected with the charge and discharge control circuit, and heat is generated when the charge and discharge control circuit performs charge and discharge control on the battery module. Here, the heat generated by the heating module may be generated during the charge of the battery module or during the discharge of the battery module. When the heating module generates heat in the charging process of the battery module, the charging power supply not only charges the battery module, but also supplies power to the heating module; when the heating module generates heat in the discharging process of the battery module, the heating module is used as the load of the battery module, the heating module is supplied with power through the battery module, at the moment, the discharging current of the battery module flows into the heating module from the positive electrode of the battery module and flows back to the battery module from the negative electrode of the battery module through the heating module, namely, the heating module can improve the external temperature of the battery module on the one hand, and on the other hand, the heating module and the impedance inside the battery module are used as the load of the battery module together, so that the battery module is overdischarged by increasing the load of the battery module, and the internal temperature of the battery module is improved quickly.

In the embodiment of the present disclosure, the heating module includes, but is not limited to, a Positive Temperature Coefficient (PTC) heating plate, and the PTC heating plate may be made of a ceramic material or a metal material, which is not limited in the embodiment of the present disclosure.

The charge and discharge circuit of the disclosed embodiment comprises: the charging and discharging control circuit is connected between a positive charging end of the charging and discharging circuit and a negative charging end of the charging and discharging circuit, is connected with the battery module and is used for controlling charging and discharging of the battery module; and the heating module is positioned outside the battery module, is connected with the charging and discharging control circuit and is used for generating heat when the charging and discharging control circuit controls the charging and discharging of the battery module. That is to say, this disclosed embodiment both can promote the outside temperature of battery module through the heat that the heating module produced in order to promote the inside temperature of battery module through carrying out charge-discharge control to the battery module, so, can promote the inside and outside temperature of battery module simultaneously to promote the heating efficiency of battery module, shorten charge time, and then can realize the function of quick charge under low temperature environment, expanded the use scene of battery module.

In some embodiments, as shown in fig. 2, the charge and discharge control circuit includes: a charge control circuit 11 and a discharge control circuit 12, wherein,

the charging control circuit 11 is connected to the positive charging terminal 20 and the negative charging terminal 30, and is configured to perform charging control on the battery module 40;

the discharge control circuit 12 is connected to the positive charging terminal 20 and the negative charging terminal 30, and is configured to perform discharge control on the battery module 40;

the heating module 50 is connected in series to the discharge control circuit 12, and is configured to generate the heat when the discharge control circuit 12 performs discharge control on the battery module 40.

In the embodiment of the disclosure, the charging and discharging of the battery module are controlled by different circuits, the charging process of the battery module is controlled by the charging control circuit, and the discharging process of the battery module is controlled by the discharging control circuit. The heating module is arranged on the discharge control circuit.

In the embodiment of the disclosure, one end of the charging control circuit is connected with the positive charging end, and the other end of the charging control circuit is connected with the positive electrode of the battery module; the negative electrode of the battery module is connected with the negative charging end; and one end of the discharging control circuit is connected with the negative charging end, and the other end of the discharging control circuit is connected with the charging control circuit and the positive electrode of the battery module. That is, the charging control circuit is connected with the negative charging terminal through the battery module, and the discharging control circuit is connected with the positive charging terminal through the heating module and the charging control circuit.

In the embodiment of the present disclosure, the heating module is connected in series to the discharge control circuit, that is, the heating module of the embodiment of the present disclosure generates heat during the discharge process of the battery module, and the heat and the internal impedance of the battery module are used together as the load of the battery module to increase the load of the battery module, so that the battery module can be in an overdischarge state during the discharge process, and the internal temperature of the battery module is further increased.

In some embodiments, as shown in fig. 3, the charging and discharging circuit further includes: a control end 60 and a locking end 70;

the charging control circuit 11 is connected to the control terminal 60 and the lock terminal 70, and is configured to perform charging control on the battery module 40 based on a signal output by the control terminal 60 and a signal output by the lock terminal 70;

the discharge control circuit 12 is connected to the control terminal 60 and the lock terminal 70, and configured to perform discharge control on the battery module 40 based on a signal output by the control terminal 60 and a signal output by the lock terminal 70.

In the embodiment of the present disclosure, the signal output by the lock terminal and the signal output by the control terminal may be sent out through a Micro Controller Unit (MCU) chip of the BMS, a high level of the signal sent by the MCU chip is 3.3V or 5V, a low level is 0V, and a high level of 3.3V or 5V may be determined according to a supply voltage of the MCU chip, which is not limited in the embodiment of the present disclosure.

In the embodiment of the present disclosure, the discharge control circuit is connected to the control end and the locking end, and the charge control circuit may be connected to the control end and the locking end through the discharge control circuit, or may be directly connected to the control end and the locking end, which is not limited in the embodiment of the present disclosure.

In the embodiment of the disclosure, the charging and discharging can be better controlled by arranging the locking end and the control end. In the embodiments of the present disclosure, the following various embodiments are described by taking the signal output by the control terminal as the first signal and the signal output by the lock terminal as the second signal.

The second signal is a high level signal or a low level signal, and when the second signal is the high level signal, the first signal is forced to be at a low level by the second signal; when the second signal is a low level signal, the state of the first signal is not affected. Here, when the second signal is a low-level signal, the state of the first signal may also be affected by the second signal, and corresponding setting may be performed according to actual design requirements, and the embodiment of the present disclosure is not limited.

The charging and discharging control is realized through the signal output by the locking end and the signal output by the control end, so that on one hand, the charging and discharging circuit has stronger anti-interference capability; on the other hand, the charge and discharge of the battery module can be controlled more flexibly.

In the embodiment of the disclosure, a first operational amplifier chip is arranged in the charging control circuit, and the first operational amplifier chip receives the signal output by the control end and the signal output by the locking end and processes the signals to control the charging of the battery module.

In the embodiment of the disclosure, a second operational amplifier chip is arranged in the discharge control circuit, and the second operational amplifier chip receives the signal output by the control end and the signal output by the locking end and processes the signals to control the discharge of the battery module.

In the embodiment of the disclosure, the control end and the locking end are both connected to the inverting input end of the second operation amplifier chip, and the inverting input end of the second operation amplifier chip is connected to the non-inverting input end of the first operation amplifier chip, so that the charging control circuit and the discharging control circuit can realize control in different states by receiving the same control signal, thereby realizing control in different states of the battery module.

In the embodiment of the disclosure, the first signal may be a Pulse Width Modulation (PWM) square wave signal. When the second signal is at a low level, the on-time of the charging control circuit and the on-time of the discharging control circuit can be controlled by controlling the duty ratio of the first signal, and the on-time of the two control circuits shows that the battery module is in a charging state or a discharging state.

In the embodiment of the disclosure, both the first signal and the second signal can enter the charging control circuit through the non-inverting input terminal of the first operational amplifier chip, and can also enter the discharging control circuit through the inverting input terminal of the second operational amplifier chip, and the signals are processed through the first operational amplifier chip and the second operational amplifier chip, so that the switching between the charging state and the discharging state of the battery module is realized.

In the embodiment of the disclosure, when the second signal is at a low level and the first signal is at a high level, the battery module is in a charging state; when the first signal is at a low level, the battery module is in a discharge state. In the embodiment of the present disclosure, when the second signal is at a high level, no matter whether the first signal is a high level signal or a low level signal, the battery module of the embodiment of the present disclosure is in a discharging state, and the charging control circuit cannot control the battery module to charge.

It should be noted that, in some embodiments, the first signal and the second signal may also enter the charge control circuit through the inverting input terminal of the first operational amplifier chip, and enter the discharge control circuit through the non-inverting input terminal of the second operational amplifier chip. When the second signal is at a low level, the battery module may be set to be in a charging state when the first signal is at a low level, and the battery module may be set to be in a discharging state when the first signal is at a high level, or the battery module may be set to be in a charging state when the second signal is at a high level, and the battery module may be set to be in a discharging state when the second signal is at a low level. The above are merely examples, and may be changed accordingly according to actual needs, and the embodiments of the present disclosure are not limited.

In some embodiments, the inverting input of the first op amp chip and the non-inverting input of the second op amp chip are connected to a same reference voltage node.

In the embodiment of the present disclosure, the reference voltage value of the reference voltage node may be set according to actual requirements, and the embodiment of the present disclosure is not limited. For example, the reference voltage value is set in the range of 0.5V to 3V, and preferably, the reference voltage value may be set to 1V.

In the embodiment of the disclosure, when the second signal is at a low level, the first operational amplifier chip and the second operational amplifier chip output corresponding level signals to control the charging and discharging states of the battery module by comparing the voltage values of the first signal and the reference voltage node. For example, when the first signal voltage is at a high level, the first signal voltage is greater than the reference voltage value. The control end is connected with the in-phase input end of the first operational amplifier chip, the reference voltage node is connected with the inverted input end of the first operational amplifier chip, and the first operational amplifier chip outputs a high-level signal to enable the battery module to be in a charging state; the control end is connected with the inverting input end of the second operational amplifier chip, the reference voltage node is connected with the non-inverting input end of the second operational amplifier chip, and the second operational amplifier chip outputs a low level signal, so that the battery module is in a non-dischargeable state. When the first signal voltage is at a low level, the first signal voltage is smaller than the reference voltage value, the first operational amplifier chip outputs a low level signal to enable the battery module to be in a non-chargeable state, and the second operational amplifier chip outputs a high level signal to enable the battery module to be in a discharging state.

In the embodiment of the disclosure, the first operational amplifier chip processes the first signal and the second signal, and the power of the control signal can be amplified to better control the conduction of the first transistor, so as to realize the charging state of the battery module. Here, the first transistor may be formed of a P-channel Metal-Oxide-Semiconductor (PMOS) transistor and a diode. The two ends of the diode are connected with the drain electrode of the PMOS tube and the source electrode of the PMOS tube, and the diode allows the current flowing from the drain electrode of the PMOS tube to the source electrode of the PMOS tube to pass. The gate of the first transistor is a gate of a PMOS transistor; the source electrode of the first transistor is the source electrode of a PMOS tube; the drain electrode of the first transistor is the drain electrode of the PMOS tube.

In the embodiment of the disclosure, when the second signal is at a low level and the voltage of the first signal is at a high level, the first transistor is turned on, the positive electrode of the battery module is connected to the positive charging terminal through the turned-on first transistor, and the charging power supply charges the battery module to enable the battery module to be in a charging state. It should be noted that, when the driving signal of the gate of the PMOS transistor is at a low level, the PMOS transistor can be turned on, and in the embodiment of the disclosure, the signal output by the first operational amplifier chip is not directly connected to the gate of the PMOS transistor. For example, a signal converter may be disposed between the output end of the first operational amplifier chip and the gate of the first transistor, and a high level signal output by the first operational amplifier chip is converted into a low level signal by the signal converter, that is, the first transistor may be driven to be turned on.

In some embodiments, the discharge control circuit further comprises:

a second transistor, wherein,

In the embodiment of the disclosure, the first signal and the second signal are processed by the second operational amplifier chip, and the power of the control signal can be amplified to better control the conduction of the second transistor, so that the discharge state of the battery module is realized. Here, the second transistor may be formed of an N-channel Metal-Oxide-Semiconductor (NMOS) transistor and a diode, or may be formed of an NPN transistor. The two ends of the diode are connected with the drain electrode of the NMOS tube and the source electrode of the NMOS tube, and the diode allows the current flowing from the source electrode of the NMOS tube to the drain electrode of the NMOS tube to pass. It should be noted that the gate of the second transistor is the gate of the NMOS transistor; the source electrode of the second transistor is the source electrode of the NMOS transistor; the drain electrode of the second transistor is the drain electrode of the NMOS transistor.

It can be understood that when the second signal is at a low level, when the first signal voltage is at a low level, the first signal voltage is smaller than the reference voltage value, the second operational amplifier chip outputs a high level signal, the high level signal enables the N-channel MOSFET to be conducted, the heating module is connected to two ends of the battery module through the conducted second transistor, the battery module supplies power to the heating module, and the battery module is in a discharging state; when the second signal is the high level, no matter first signal is the high level or the low level is all forced to the low level by the second signal, and first signal voltage is less than the reference voltage value, and second fortune puts a ware chip output high level signal, and high level signal makes N channel MOSFET switch on, and the heating module is connected at battery module both ends through the second transistor that switches on, and the battery module is for heating the module power supply, and the battery module also is in the discharge state.

In some embodiments, the charge control circuit further comprises:

In the embodiment of the disclosure, the third transistor is disposed between the output end of the first operational amplifier chip and the gate of the first transistor, and the third transistor converts the high level signal output by the first operational amplifier chip into the low level signal, so as to drive the first transistor to be turned on. Here, the third transistor may be formed of an NMOS transistor and a diode, or may be formed of an NPN transistor. The two ends of the diode are connected with the drain electrode of the NMOS tube and the source electrode of the NMOS tube, and the diode allows the current flowing from the source electrode of the NMOS tube to the drain electrode of the NMOS tube to pass. The gate of the third transistor is the gate of an NMOS transistor; the source electrode of the third transistor is the source electrode of an NMOS transistor; the drain electrode of the third transistor is the drain electrode of the NMOS transistor.

It is to be understood that, when the second signal is at a low level and the first signal voltage is at a high level, the first signal voltage is greater than the reference voltage value, the second operational amplifier chip outputs a high level signal, and the high level signal turns on the third transistor. When the third transistor is conducted, the grid electrode of the first transistor is connected to the negative charging end, the grid electrode of the first transistor is in a low level, the first transistor is driven to be conducted, the positive electrode of the battery module is connected to the positive charging end through the conducted second transistor, and the charging power supply charges the battery module to enable the battery module to be in a charging state. It should be noted that, at this time, since the second operational amplifier chip outputs a low level signal, the first transistor in the discharge control circuit is in an off state, the battery module is in a non-dischargeable state, and the charging power supply cannot supply power to the heating module.

In the embodiment of the disclosure, the first unidirectional conducting element includes, but is not limited to, a diode, an anode of the diode is connected to the positive charging terminal, and a cathode of the diode is connected to the positive electrode of the battery module, so that when the battery module is in a discharging state, the diode can prevent a discharging current from flowing into the charging power supply, and protect the charging power supply.

In the embodiment of the present disclosure, the first resistor module may be a plurality of resistors, for example, a resistor is set to be connected between the output terminal of the first operational amplifier chip and the gate of the third transistor, and a resistor is set to be connected between the gate and the source of the third transistor, so that the third transistor can be driven to be turned on better; for another example, the setting resistor is connected between the drain of the third transistor and the gate of the first transistor, and the setting resistor is connected between the gate and the source of the first transistor, so that the first transistor can be driven to be turned on better.

In some embodiments, the discharge control circuit further comprises: a second unidirectional conducting element and a fourth transistor, wherein,

In the embodiment of the disclosure, in order to better realize that the first signal and the second signal simultaneously control the charging and discharging of the battery module, the second unidirectional conducting piece and the fourth transistor are arranged to realize the influence of the second signal on the first signal.

In the embodiment of the present disclosure, the fourth transistor may be formed by an NMOS transistor and a diode, or may be formed by an NPN transistor. The two ends of the diode are connected with the drain electrode of the NMOS tube and the source electrode of the NMOS tube, and the diode allows the current flowing from the source electrode of the NMOS tube to the drain electrode of the NMOS tube to pass. The grid electrode of the fourth transistor is the grid electrode of an NMOS tube; the source electrode of the fourth transistor is the source electrode of an NMOS tube; the drain electrode of the fourth transistor is the drain electrode of the NMOS tube.

In the disclosed embodiment, the second unidirectional conducting component includes, but is not limited to, a diode, an anode of the diode is connected to the inverting input terminal of the second operational amplifier chip, and a cathode of the diode is connected to the drain of the fourth transistor. Therefore, when the second signal output by the locking end is at a high level, the fourth transistor is conducted, and the first signal at the inverting input end of the second operational amplifier chip is forced to be at a low level through the diode, so that the first signal is invalid; when the second signal output by the locking end is in a low level, the fourth transistor is turned off, and the second signal does not influence the first signal.

In some embodiments, the discharge control circuit further comprises: a third one-way conductive element and a second resistor module, wherein,

In the embodiment of the present disclosure, a third unidirectional conducting element may be disposed on the circuit where the heating module is located, where the third unidirectional conducting element includes, but is not limited to, a diode, an anode of the diode is connected to an anode of the battery module, and a cathode of the diode is connected to a cathode of the battery module, so that the battery module may be protected by the third unidirectional conducting element during a discharging process of the battery module.

In the embodiment of the present disclosure, the second resistor module may be a plurality of resistors, for example, the resistor is connected between the output end of the second operational amplifier chip and the gate of the second transistor, and the resistor is connected between the gate and the source of the second transistor, so that the second transistor can be better driven to be turned on; for another example, the setting resistor is connected between the gate and the source of the fourth transistor, so that the fourth transistor can be driven to be conducted better; for another example, a resistor is connected between the control terminal and the inverting input terminal of the second op-amp chip, so that the first signal can be better transmitted.

In some embodiments, as shown in fig. 4, the charging and discharging circuit further includes: a reference power supply circuit, wherein,

the reference power circuit 80 is connected to the charge control circuit 11 and the discharge control circuit 12, and is configured to provide working voltage for the charge control circuit 11 and the discharge control circuit 12.

In the embodiment of the disclosure, the reference power circuit provides working voltages for the first operational amplifier chip of the charging control circuit and the second operational amplifier chip of the discharging control circuit.

In some embodiments, the reference power supply circuit comprises: the voltage-stabilizing circuit comprises a first voltage-dividing module, a controllable voltage-stabilizing source chip, a second voltage-dividing module and a capacitor module;

In the embodiment of the disclosure, the controllable voltage-stabilizing source chip is used for providing working voltage for the first operational amplifier chip and the second operational amplifier chip, and when the model of the controllable voltage-stabilizing source chip is selected, the model can be selected according to the working voltage requirements of the first operational amplifier chip and the second operational amplifier chip, wherein the controllable voltage-stabilizing source chip includes but is not limited to a TL431 chip.

The first voltage division module is connected to two ends of the charging power supply in parallel through the positive charging end and the negative charging end, the first voltage division module can be formed by connecting a plurality of resistors in series, the number and the resistance of the resistors in the first voltage division module can be adaptively set according to the controllable voltage stabilization source chip, and the embodiment of the disclosure is not limited.

The second voltage division module is configured to provide a reference voltage for the first operational amplifier chip and the first operational amplifier chip, and the second voltage division module may be formed by connecting a plurality of resistors in series, where the number and the resistance of the resistors may be adaptively set according to a reference voltage value, which is not limited in the embodiment of the disclosure. The capacitor module may be one or more capacitors, and the embodiments of the disclosure are not limited.

For a better understanding of one or more of the embodiments described above, embodiments of the present disclosure are illustrated as follows:

as shown in fig. 5, the charging and discharging circuit includes 13 resistors, 1 capacitor, 3 diodes, 1 PTC heater, 3N-channel MOSFETs, 1P-channel MOSFET, 2 op-amp chips, and 1 controllable regulated power supply chip.

Wherein, reference power supply circuit includes: the circuit comprises a controllable voltage regulator chip U2, a first voltage division module (R1, R2 and R3), a capacitor module C1 and a second voltage division module (R4 and R5);

the charge control circuit includes: the circuit comprises a first operational amplifier chip U1A, a first transistor Q1, a third transistor Q2, a first one-way conducting piece D1 and a first resistor module (R8, R9, R12 and R13);

the discharge control circuit includes: the circuit comprises a second operational amplifier chip U1B, a second transistor Q3, a fourth transistor Q4, a second one-way conducting piece D3, a third one-way conducting piece D2 and a second resistor module (R6, R7, R10 and R11);

the heating module PTC1, the battery module BAT, GND are negative charging terminals, vbat is the positive pole of the battery module, the power supply voltage of the first operational amplifier chip and the second operational amplifier chip is 5V, and vin is the positive pole of the charging power supply.

One end of R1 in the reference power circuit is connected with the positive charging end 20, and the other end of R1 is connected with one end of R2, the cathode of U2 and one end of C1 and is used as a power supply 5V for output; the other end of the R2 is connected with one end of the R3 and the reference pole of the U2; the other end of the R3 is connected with the anode of the U2, the other end of the C1 and a negative charging end GND; one end of the R4 is connected with a power supply 5V; the other end of R4 is connected to one end of R5 and serves as a reference voltage node REF _1V2.

In the charging control circuit, a pin 8 of a power supply pin of U1A is connected with a power supply 5V, and the output end of U1A is connected with one end of R8; the other end of the R8 is connected with one end of the R9 and the grid electrode of the Q2; the other end of the R9 is connected with the source electrode of the Q2, the other end of the R5, the 4-pin of the U1A and the negative charging end GND; the drain electrode of the Q2 is connected with one end of the R13; the other end of R13 is connected with one end of R12 and the grid electrode of Q1; the other end of R12 is connected with the source of Q1 and the positive charging end 20; the drain electrode of the Q1 is connected with the anode of the D1; the cathode of the D1 is connected with the anode Vbat of the battery module BAT;

in the discharge control circuit, one end of R6 is connected to the control terminal 60; the other end of the R6 is connected with the anode of the D3 and the inverted input end of the U1B and serves as a first signal receiving end; the cathode of the D3 is connected with the drain electrode of the Q4; the gate of Q4 is connected to one end of R7, lock terminal 70; the output end of the U1B is connected with one end of the R10; the other end of R10 is connected with one end of R11 and the grid of Q3; the other end of R11 is connected with the source electrode of Q3, the source electrode of Q4, the other end of R7 and the negative charging end GND; the drain electrode of the Q3 is connected with one end of the PTC 1; the other end of the PTC1 is connected with the cathode of the D2; the anode of D2 is connected to the positive electrode Vbat of the battery module BAT.

The positive charging terminal 20 is connected to Vin; the negative charging end is connected with the negative electrode of the battery module; the non-inverting input end of the U1A in the charging control circuit and the inverting input end of the U1B in the discharging control circuit; the non-inverting input of U1B in the discharge control circuit is connected to the inverting input of U1A in the charge control circuit and to reference voltage node REF _1V2.

The reference power supply circuit outputs a stable 5V power supply to provide working voltage for the charging control circuit and the discharging control circuit; meanwhile, the charging control circuit divides 5V voltage through the R4 and R5 resistors to obtain a reference voltage value of 1V;

the high level of the first signal PWM square wave signal output by the control terminal 60 is 3.3V or 5V, and the low level is 0V; when the second signal is at a high level, Q4 is in a conducting state, and the PWM square wave signal is forced to be at a low level through a D3 diode to be invalid; when the second signal is low, it does not contribute to the overall circuit.

When the second signal is at a low level and the PWM square wave signal is at a high level, the voltage of the non-inverting input terminal of U1A is higher than that of the inverting input terminal, U1A outputs a high level, the gate of Q2 is at a high level, Q2 is in a conducting state, the gate of Q1 is at a low level, Q1 is also in a conducting state, and at this time, the battery module is in a chargeable state; meanwhile, the non-inverting input end of the U1B is lower than the inverting input end voltage, the U1A outputs low level, the grid electrode of the Q3 is low level, the Q3 is in a cut-off state, and the battery module is in a non-discharge state.

When the second signal is at a low level and the PWM square wave signal is at a low level, the non-inverting input terminal of U1A is lower than the inverting input terminal, U1A outputs a low level, the gate of Q2 is at a low level, Q2 is in an off state, the gate of Q1 is at a high level, Q1 is also in an off state, and at this time, the battery module is in a non-chargeable state; meanwhile, the voltage of the non-inverting input end of the U1B is higher than that of the inverting input end, the U1A outputs a high level, the grid of the Q3 is the high level, the Q3 is in a conducting state, and at the moment, the battery module is in a dischargeable state.

When the second signal is at a high level, the PWM square wave signal is forced to be at a low level at the inverting input end of the U1B, the voltage of the non-inverting input end of the U1A is lower than that of the inverting input end, the U1A outputs a low level, the grid of the Q2 is at a low level, the Q2 is in a cut-off state, the grid of the Q1 is at a high level, the Q1 is also in a cut-off state, and at the moment, the battery module is in a non-chargeable state; meanwhile, the voltage of the non-inverting input end of the U1B is higher than that of the inverting input end, the U1A outputs a high level, the grid of the Q3 is the high level, the Q3 is in a conducting state, and at the moment, the battery module is in a dischargeable state.

The on-state duration of the charging control circuit and the on-state duration of the discharging control circuit can be controlled by controlling the duty ratio of the PWM square wave signal, and the on-state duration of the two control circuits shows that the lithium battery is in a charging state or a discharging state.

When the charging control circuit controls the charging and discharging control circuit to control discharging, the charging current and the discharging current enter the interior of the battery module and generate heat through the internal impedance of the battery module, so that the internal temperature of the battery module rises; the discharge control circuit controls discharge, and meanwhile the heating module on the discharge loop generates heat due to current, and the heating module is wrapped outside the battery module to raise the external temperature of the battery module; promote the inside and outside temperature of battery through inside and outside two aspects fast, make battery module bulk temperature rise to can support the temperature interval back that the big multiplying power charges, the rethread BMS switches to charge for the heavy current multiplying power, can shorten charge time, realizes low temperature quick charge-discharge, has expanded lithium cell service environment scope, improves user experience.

The disclosed embodiment also provides a battery assembly, which includes:

a battery module;

the charging and discharging circuit in one or more of the above embodiments is connected to the battery module; the positive charging end of the charging and discharging circuit is connected with the positive pole of the battery module, and the negative charging end of the charging and discharging circuit is connected with the negative pole of the battery module.

In the embodiment of the present disclosure, the battery module may be a power battery, such as a lithium ion battery, and the embodiment of the present disclosure is not limited. The positive electrode of the battery module is connected to the positive charging terminal through the charging control circuit of the charging and discharging circuit.

The battery pack comprises a charging and discharging circuit, the charging and discharging control circuit of the charging and discharging circuit is used for controlling the charging and discharging of the battery module, and the heating module is used for generating heat when the charging and discharging control of the battery module is carried out. That is to say, the battery pack of this disclosed embodiment can promote the inside and outside temperature of battery module simultaneously to promote battery module's heating efficiency, shorten charge time, and then can realize the function of quick charge under low temperature environment, expanded battery module's service environment scope.

The embodiment of the present disclosure further provides a terminal device, where the terminal device includes:

a charging interface;

as for the battery assembly in one or more embodiments, a positive charging end of a charging and discharging circuit of the battery assembly is connected to a positive interface of the charging interface, and a negative charging end of the charging and discharging circuit is connected to a negative interface of the charging interface.

In the embodiment of the present disclosure, the terminal device is a device powered by the battery module, and includes a mobile terminal or a wearable device. The mobile terminal comprises a smart phone or a tablet computer; the wearable device may include a smart watch, and the terminal device of the embodiments of the present disclosure may further include various consumer electronics products, digital products, and the like.

The terminal equipment comprises a charging and discharging circuit, and the heating efficiency of the battery module can be improved by heating the inside and the outside of the battery module through the charging and discharging circuit, so that on one hand, the charging time of the terminal equipment can be shortened, and the use environment of the terminal equipment is expanded; on the other hand, the charging safety of the battery module can be improved, and the service life of the terminal equipment is prolonged.

Fig. 6 is a block diagram illustrating a structure of a terminal device according to an exemplary embodiment. For example, the terminal device may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.

Referring to fig. 6, terminal device 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communications component 816.

The processing component 802 generally controls overall operation of the terminal device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.

The memory 804 is configured to store various types of data to support operation at the device 800. Examples of such data include instructions for any application or method operating on terminal device 800, contact data, phonebook data, messages, pictures, videos, and the like. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

Power components 806 provide power to the various components of terminal device 800. Power components 806 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for terminal device 800.

The multimedia component 808 comprises a screen providing an output interface between the terminal device 800 and a user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the device 800 is in an operational mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive an external audio signal when the terminal device 800 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

Sensor component 814 includes one or more sensors for providing various aspects of state assessment for terminal device 800. For example, sensor assembly 814 can detect the open/closed state of device 800, the relative positioning of components, such as a display and keypad of terminal device 800, sensor assembly 814 can also detect a change in the position of terminal device 800 or a component of terminal device 800, the presence or absence of user contact with terminal device 800, orientation or acceleration/deceleration of terminal device 800, and a change in the temperature of terminal device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

Communication component 816 is configured to facilitate communications between terminal device 800 and other devices in a wired or wireless manner. The terminal device 800 may access a wireless network based on a communication standard, such as WiFi,2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the terminal device 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic components.

In an exemplary embodiment, a non-transitory computer readable storage medium including instructions, such as the memory 804 including instructions, executable by the processor 820 of the terminal device 800 is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A charging and discharging circuit, comprising:

2. The charging and discharging circuit according to claim 1, wherein the charging and discharging control circuit comprises: a charge control circuit and a discharge control circuit, wherein,

the heating module is connected in series to the discharge control circuit and used for generating the heat when the discharge control circuit performs discharge control on the battery module.

3. The charging and discharging circuit of claim 2, further comprising: a control end and a locking end;

4. The charging and discharging circuit according to claim 3,

the charging control circuit comprises a first operational amplifier chip; the discharge control circuit comprises a second operational amplifier chip;

the inverting input end of the second operational amplifier chip is connected with the non-inverting input end of the first operational amplifier chip;

5. The charging and discharging circuit of claim 4, wherein the charging control circuit further comprises a first transistor, wherein,

6. The charging and discharging circuit of claim 4, wherein the discharging control circuit further comprises:

a second transistor, wherein,

7. The charge and discharge circuit of claim 4, wherein the inverting input of the first op amp chip is connected to the same reference voltage node as the non-inverting input of the second op amp chip.

8. The charging and discharging circuit of claim 4, wherein the charging control circuit further comprises:

9. The charging and discharging circuit of claim 4, wherein the discharging control circuit further comprises:

a second unidirectional conducting element and a fourth transistor, wherein,

10. The charging and discharging circuit of claim 9, wherein the discharging control circuit further comprises:

a third one-way conduction device and a second resistor module, wherein,

11. The charging and discharging circuit according to any one of claims 2 to 10, further comprising: a reference power supply circuit, wherein,

12. The charging and discharging circuit according to claim 11, wherein the reference power supply circuit comprises:

13. A battery assembly, comprising:

a battery module;

the charge and discharge circuit according to any one of claims 1 to 12, connected to the battery module; the positive charging end of the charging and discharging circuit is connected with the positive pole of the battery module, and the negative charging end of the charging and discharging circuit is connected with the negative pole of the battery module.

14. A terminal device, characterized in that the terminal device comprises:

a charging interface;

the battery assembly of claim 13, wherein a positive charging terminal of a charging and discharging circuit of the battery assembly is connected to a positive interface of the charging interface, and a negative charging terminal of the charging and discharging circuit is connected to a negative interface of the charging interface.