CN115706426A

CN115706426A - Battery protection board circuit, battery control method, battery control device and medium

Info

Publication number: CN115706426A
Application number: CN202110904051.7A
Authority: CN
Inventors: 杨瑞福
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2023-02-17

Abstract

The disclosure relates to a battery protection board circuit, a battery control method, a battery control device and a medium. The battery protection board circuit comprises a first battery, a second battery and a current protection circuit which are connected in parallel. And the current protection circuit is used for performing current stabilization treatment on the battery with the higher detection voltage in the first battery and the second battery when the voltage difference between the first battery and the second battery is greater than the first voltage difference threshold value. The battery control method is applied to a battery protection board circuit and comprises the following steps: a first detection voltage of the first battery and a second detection voltage of the second battery are monitored by the current protection circuit. And in response to the fact that the voltage difference between the first detection voltage and the second detection voltage is larger than the first voltage difference threshold value, performing current stabilization processing on the battery with the larger detection voltage in the first battery and the second battery. The situation that a mainboard where a battery protection board circuit is located is burnt down due to the fact that pulse current generated in the discharging moment of a first battery or a second battery with large voltage is large can be avoided, and therefore the use safety of the battery is improved.

Description

Battery protection board circuit, battery control method, battery control device and medium

Technical Field

The present disclosure relates to the field of battery management technologies, and in particular, to a battery protection board circuit, a battery control method, a battery control apparatus, and a medium.

Background

In the related art, in order to increase the battery capacity of the terminal without increasing the thickness of the battery, a scheme of connecting two identical batteries in parallel is generally adopted. The parallel connection of the circuits is realized on the mainboard after the two battery connectors are buckled on the mainboard.

However, in the charging process, due to the problems of uneven wiring of the main board or the property of the battery, when two batteries connected in parallel are charged, the situation that one battery is fully charged first and one battery is not fully charged occurs, and then the battery fully charged first enters an over-charge protection state. When the battery in the overcharge protection state discharges, larger pulse current can be generated instantly, and the circuit components of the main board are easy to burn.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a battery protection board circuit, a battery control method, a battery control apparatus, and a medium.

According to a first aspect of the embodiments of the present disclosure, there is provided a battery protection board circuit including a first battery, a second battery, and a current protection circuit connected in parallel with each other; the current protection circuit is used for performing current stabilization processing on a battery with a larger detection voltage in the first battery and the second battery when the voltage difference between the first battery and the second battery is larger than a first voltage difference threshold value.

In one embodiment, the current protection circuit includes: and the first current stabilizing circuit is connected in series with the power loop of the first battery. And the second current stabilizing circuit is connected in series with the power loop of the second battery. And a first input pin of the double-channel voltage comparator is connected with a detection pin of the first battery, a first output pin of the double-channel voltage comparator is connected with the first current stabilizing circuit, a second input pin of the double-channel voltage comparator is connected with a detection pin of the second battery, and a second output pin of the double-channel voltage comparator is connected with the second current stabilizing circuit.

In another embodiment, the first current stabilization circuit includes: the current limiting circuit comprises a first current limiting element and a first field effect transistor, wherein the first current limiting element is connected with the first field effect transistor in parallel. The second current stabilization circuit includes: the second current limiting element is connected with the second field effect transistor in parallel.

In yet another embodiment, the first current limiting element includes: a first inductor or a first thermistor. The second current limiting element includes: a second inductor or a second thermistor.

According to a second aspect of the embodiments of the present disclosure, there is provided a battery control method applied to a battery protection board circuit including a first battery, a second battery, and a current protection circuit connected in parallel to each other, the battery control method including: monitoring, by the current protection circuit, a first detected voltage of the first battery and a second detected voltage of the second battery. And responding to the fact that the voltage difference between the first detection voltage and the second detection voltage is larger than a first voltage difference threshold value, and performing current stabilization processing on the battery with the larger detection voltage in the first battery and the second battery.

In one embodiment, the current protection circuit includes a dual channel voltage comparator, a first current stabilization circuit and a second current stabilization circuit. The current stabilization treatment is carried out to the battery that detects voltage great in first battery and the second battery, include: determining, by the dual-channel voltage comparator, a voltage difference between the first detection voltage and the second detection voltage. And responding to the fact that the voltage difference is larger than a first voltage difference threshold value and the first detection voltage is larger than the second detection voltage, and performing current stabilization processing on the first battery through the first current stabilization circuit. And responding to the fact that the voltage difference is larger than a first voltage difference threshold value and the second detection voltage is larger than the first detection voltage, and performing current stabilization processing on the second battery through the second current stabilization circuit.

In another embodiment, the first current stabilizing circuit includes a first current limiting element and a first field effect transistor, and the second current stabilizing circuit includes a second current limiting element and a second field effect transistor. The current stabilization processing of the first battery by the first current stabilization circuit includes: and controlling the first field effect transistor to be cut off, controlling the second field effect transistor to be conducted, and carrying out current stabilization treatment on the first battery through the first current limiting element. The current stabilization processing of the second battery by the second current stabilization circuit includes: and controlling the second field effect transistor to be cut off, controlling the first field effect transistor to be conducted, and performing current stabilization treatment on the second battery through the second current limiting element.

In another embodiment, the battery control method further includes: and controlling the second field effect transistor to be conducted and controlling the first field effect transistor to be conducted in response to the fact that the voltage difference between the first detection voltage and the second detection voltage is smaller than or equal to a second voltage difference threshold value.

According to a third aspect of the embodiments of the present disclosure, there is provided a battery control device applied to a battery protection board circuit including a first battery, a second battery, and a current protection circuit connected in parallel to each other, the battery control device including: and the monitoring unit is used for monitoring a first detection voltage of the first battery and a second detection voltage of the second battery through the current protection circuit. And the control unit is used for responding to the fact that the voltage difference between the first detection voltage and the second detection voltage is larger than a first voltage difference threshold value, and performing current stabilization treatment on the battery with the larger detection voltage in the first battery and the second battery.

In one embodiment, the current protection circuit includes a dual channel voltage comparator, a first current stabilization circuit and a second current stabilization circuit. The control unit performs current stabilization processing on a battery with a larger detection voltage in the first battery and the second battery by adopting the following mode: determining, by the dual-channel voltage comparator, a voltage difference between the first detection voltage and the second detection voltage. And responding to the fact that the voltage difference is larger than a first voltage difference threshold value and the first detection voltage is larger than the second detection voltage, and performing current stabilization processing on the first battery through the first current stabilization circuit. And responding to the fact that the voltage difference is larger than a first voltage difference threshold value and the second detection voltage is larger than the first detection voltage, and performing current stabilization processing on the second battery through the second current stabilization circuit.

In another embodiment, the first current stabilization circuit includes a first current limiting element and a first field effect transistor, and the second current stabilization circuit includes a second current limiting element and a second field effect transistor. The control unit carries out current stabilization treatment on the first battery through the first current stabilization circuit in the following mode: and controlling the first field effect transistor to be cut off, controlling the second field effect transistor to be conducted, and carrying out current stabilization treatment on the first battery through the first current limiting element. The control unit carries out current stabilization treatment on the second battery through the second current stabilization circuit in the following mode: and controlling the second field effect transistor to be cut off, controlling the first field effect transistor to be conducted, and performing current stabilization treatment on the second battery through the second current limiting element.

In another embodiment, the control unit is further configured to: and in response to the fact that the voltage difference between the first detection voltage and the second detection voltage is smaller than or equal to a second voltage difference threshold value, controlling the second field effect transistor to be conducted, and controlling the first field effect transistor to be conducted.

According to a fourth aspect of the embodiments of the present disclosure, there is provided a battery control apparatus including: a memory to store instructions; and the processor is used for calling the instructions stored in the memory to execute any one of the battery control methods.

According to a fifth aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium having stored therein instructions that, when executed by a processor, perform any one of the above-described battery control methods.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: through the battery protection board circuit that this disclosure provided, can be when monitoring that the voltage difference between the first detection voltage of first battery and the second detection voltage of second battery is greater than the voltage difference threshold value, to first battery with the produced pulse current of the great battery of detection voltage carries out the stationary flow and handles in the second battery, and then avoids because the great first battery of voltage or second battery of voltage are great at the produced pulse current of discharge in the twinkling of an eye, lead to the condition emergence that battery protection board circuit place mainboard was burnt to improve battery safety in utilization.

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 schematic diagram illustrating a cell structure distribution according to an exemplary embodiment.

Fig. 2 is a schematic diagram illustrating a battery protection board circuit according to an exemplary embodiment.

Fig. 3 is a schematic diagram illustrating another battery protection panel circuit according to an exemplary embodiment.

Fig. 4 is a schematic diagram illustrating another battery protection board circuit according to an exemplary embodiment.

FIG. 5 is a flow chart illustrating a battery control method according to an exemplary embodiment.

FIG. 6 is a flow chart illustrating another battery control method according to an exemplary embodiment.

Fig. 7 is a block diagram illustrating a battery control apparatus according to an exemplary embodiment.

FIG. 8 is a block diagram illustrating another battery control apparatus 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 disclosure, as detailed in the appended claims.

In the related art, in order to increase the battery capacity of the end product without increasing the thickness of the battery, a scheme of connecting two identical batteries in parallel is generally adopted. The parallel connection of the circuits is realized on the mainboard after the two battery connectors are buckled on the mainboard. The geometry of the parallel batteries can be as shown in fig. 1, and the connector of battery a and the connector of battery B are fastened to the motherboard, so as to realize the parallel connection of battery a and battery B. Fig. 1 is a schematic diagram illustrating a cell structure according to an exemplary embodiment.

A circuit arrangement of the protection board connecting two identical batteries in parallel can be seen in fig. 2. Fig. 2 is a schematic diagram illustrating a battery protection board circuit according to an exemplary embodiment. Since battery a and battery B are the same battery, the internal protection board circuit distribution of both is the same. When the battery A and the battery B are connected in parallel, a P + pin of the battery A and a P + pin of the battery B are connected together on the mainboard, and a P-pin of the battery A and a P-pin of the battery B are connected together on the mainboard. Battery a and battery B are charged simultaneously by the terminal through the parallel port.

However, in an actual use scenario, in a production process of batteries of the same type, a manufacturing error or a situation of unequal capacity occurs, so that the cell resistances of the batteries are different individually. In the use process of the battery, the aging degree of the battery is different, so that the resistance values in the batteries of different individuals are correspondingly changed. Moreover, when the protection board circuit with the batteries connected in parallel is used for charging in the charging process, the impedance of the power circuit line of the battery A is not equal to the impedance of the power circuit line of the battery B due to the uneven trend of the main board. Therefore, when the battery a and the battery B are charged simultaneously through the protection board circuit of the parallel batteries, one battery is fully charged first and one battery is not fully charged. However, when the terminal charges the battery a and the battery B, if there is a battery with an insufficient charge, the terminal does not stop charging the battery a and the battery B, and thus the battery which is fully charged first enters an overcharge protection state.

The following will specifically describe a process of protecting a battery in an overcharge protection state by taking a single battery as an example. The protection board circuit distribution inside the single cell can be as shown in fig. 3. Fig. 3 is a schematic diagram illustrating another battery protection board circuit according to an exemplary embodiment. The battery protection board circuit comprises a protection loop and a power loop. The protection loop is composed of a protection Integrated Circuit (IC) and a capacitor resistor at the periphery thereof. The peripheral capacitance resistance includes: r1, R2, R3 and R4. And a BS pin of the protection IC is connected with the VSS pin and is used for detecting the voltage at two ends of the battery electric core through a pin B + and a pin BS. The power loop is composed of a P + pin, a P-pin, a loop resistor (Rsense), and MOS transistors (G1, G2), and can be understood as a charging path or a discharging path of a battery. When the battery enters an overcharge protection state, the charging MOS tube G1 is closed and can not supply power to the battery any more. However, the battery can discharge through the reverse body diode of the charging MOS transistor G1 and the discharging MOS transistor G2, and when the voltage of the battery cell is lower than a certain voltage value through discharging, the overcharge protection state is released.

Therefore, in the protection plate circuit with batteries connected in parallel, when charging is finished, the batteries in a normal state are discharged firstly to reduce the voltage difference between the batteries A and B, so that the reverse body diode of the charging MOS tube G1 of the batteries in an overcharge protection state can conduct voltage drop, and the overcharge protection state is relieved. However, when the battery with the over-charge protection state removed is discharged, a large pulse current is generated in the moment of discharging, which easily causes the risk of burning the circuit components of the main board, and further affects the use safety of the battery.

In view of this, the present disclosure provides a battery protection board circuit, which can perform current stabilization on a battery with a higher detection voltage in a first battery and a second battery when a voltage difference between the first battery and the second battery is greater than a first voltage difference threshold, so as to avoid a situation that a motherboard where the battery protection board circuit is located is burned due to a larger pulse current generated at a discharge moment of the first battery or the second battery with the higher voltage, thereby improving the use safety of the battery.

In the embodiment of the present disclosure, the battery protection board circuit provided by the present disclosure may be applied to a terminal. In one example, the category of terminals may include mobile terminals, such as: tablet, ipod, notebook, etc. In another example, the structure of the terminal may include: a dual-screen terminal, a folding screen terminal, a full-screen terminal, etc.

As shown in fig. 4, the battery protection board circuit provided by the present disclosure includes a first battery 10, a second battery 20, and a current protection circuit 30 connected in parallel with each other. The current protection circuit 30 is configured to perform current stabilization on a battery with a higher detection voltage of the first battery and the second battery when a voltage difference between the first battery 10 and the second battery 20 is greater than a first voltage difference threshold. The first battery 10 and the second battery 20 may be the same battery, and when the terminal charges the first battery 10 and the second battery 20 through the parallel port, the charging speed and the charging amount of the first battery 10 and the second battery 20 may be consistent, or when the first battery 10 and the second battery 20 are discharged, the discharging speed and the discharging amount of the first battery 10 and the second battery 20 may be consistent.

Due to the property problem of the battery or the wiring problem of the protection board circuit, when the first battery 10 and the second battery 20 are charged in parallel or discharged in parallel through the parallel port, the detection voltage of the first battery 10 is easily inconsistent with the detection voltage of the second battery 20, and then the first battery 10 or the second battery 20 with too large detection voltage enters an overcharge protection state. Therefore, in order to monitor the timing of discharging after the overcharge protection state of the first battery 10 or the second battery 20 having an excessive voltage is released, the determination is made by the current protection circuit 30 based on the comparison result between the voltage difference between the first battery 10 and the second battery 20 and the first voltage difference threshold value. The first voltage difference threshold value may be understood as a minimum voltage difference used to measure whether the first battery 10 or the second battery 20 in the overcharge protection state releases the overcharge protection state. If the voltage difference between the first battery 10 and the second battery 20 is greater than the first voltage difference threshold, it represents that the first battery 10 or the second battery 20 in the overcharge protection state has released the overcharge protection state, and needs to perform a current stabilization process on the battery to avoid the risk that the pulse current generated at the moment of discharging may burn the circuit components of the main board. If the voltage difference between the first battery 10 and the second battery 20 is smaller than or equal to the first voltage difference threshold, it is indicated that the first battery 10 or the second battery 20 in the overcharge protection state is still in the overcharge protection state, and is not discharged temporarily. Therefore, when it is determined that the voltage difference between the first battery 10 and the second battery 20 is greater than the first voltage difference threshold, the current stabilization process is performed on the battery with the higher detection voltage among the first battery and the second battery.

In an example, if the voltage difference between the first battery 10 and the second battery 20 is less than or equal to the first voltage difference threshold, the first battery 10 or the second battery 20 with a larger detection voltage is still in the overcharge protection state, and the reverse body diode of the charging MOS transistor G1 of the first battery 10 or the second battery 20 with a larger detection voltage is still in the conduction voltage drop state. That is, the voltage reduction process of the first cell 10 or the second cell 20 having a large detection voltage still needs to be continued. Therefore, no current stabilization process by the current protection circuit 30 is required.

In one embodiment, the current protection circuit 30 for performing current stabilization includes: a first ballast circuit 31, a second ballast circuit 32, and a dual channel voltage comparator 33. The first current stabilizing circuit 31 is connected in series with the power loop of the first battery 10, and is configured to perform current stabilizing processing on the pulse current released by the first battery 10 when the overcharge protection state of the first battery 10 is released. The second current stabilizing circuit 32 is connected in series with the power loop of the second battery 20 and is used for performing current stabilizing processing on the pulse current released by the second battery 20 when the overcharge protection state of the second battery 20 is released.

The dual channel voltage comparator 33 is used to determine the voltage difference between the detected voltage of the first battery 10 and the detected voltage of the second battery 20. The first input pins (IN 1A, IN 1B) of the dual-channel voltage comparator 33 are connected to the detection pin (B +/BS) of the first battery 10 for detecting the detection voltage of the first battery 10. The first output pin (OUTA) is connected to the first current stabilizing circuit 31. Second input pins (IN 1B, IN 2B) of the dual-channel voltage comparator 33 are connected to a detection pin (B +/BS) of the second battery 20 for detecting a detection voltage of the second battery 20. The second output pin (OUTB) is connected to a second ballast circuit 32.

In another embodiment, the first current stabilizing circuit 31 includes: the current-stabilizing device comprises a first current limiting element and a first field effect transistor (MOS) tube (GA), wherein the first current limiting element is connected with the first field effect transistor (GA) for current stabilizing treatment in parallel. The second current stabilization circuit 32 for performing current stabilization processing includes: the second current limiting element is connected with the second field effect transistor (GB) for current stabilizing treatment in parallel.

In an implementation scenario, when the first battery 10 and the second battery 20 are in normal charging or discharging, the first output pin (OUTA) of the dual-channel voltage comparator 33 outputs a high level, the first MOS transistor (GA) is closed, the first current limiting element is short-circuited, the second output pin (OUTB) outputs a high level, the second MOS transistor (GB) is closed, and the second current limiting element is short-circuited, so as to ensure that the terminal can be normally instantly pulled and reduce the impedance of the line. If the first battery 10 or the second battery 20 is in the overcharge protection state, the single battery (the first battery 10 or the second battery 20) with the excessively high detection voltage is determined by the dual-channel voltage comparator 33. If the voltage detected by the first battery 10 is too high, the first MOS transistor (GA) for current stabilization is cut off and connected in parallel with the first current limiting element, the closed state of the second MOS transistor (GB) is maintained, and the pulse current released by the first battery 10 is further subjected to current stabilization by the first current limiting element. If the voltage detected by the second battery 20 is too high, the second MOS transistor (GB) for performing current stabilization processing is turned off and connected in parallel with the second current limiting element, the closed state of the first MOS transistor (GA) is maintained, and the pulse current released by the second battery 20 is subjected to current stabilization processing by the second current limiting element.

In yet another embodiment, the first current limiting element may include: a first inductance (L) or a first thermistor (NTC). If the first current limiting element is a first inductor, when the overcharge protection state is released and the pulse current is released by the first battery 10, the pulse current is absorbed by the first inductor, and the inductor is reduced along with the gradual reduction of the pulse current until the pulse current is stabilized, so as to achieve the purpose of stabilizing the current. If the first current limiting element is a first thermistor, the first battery 10 absorbs the pulse current through the first thermistor when the overcharge protection state is removed and the pulse current is released, and simultaneously, when the first thermistor generates heat, the resistance value of the first thermistor is increased, so that the pulse current is gradually stabilized, and the purpose of stabilizing the current is achieved. The second current limiting element may include: a second inductor or a second thermistor. The principle of the second current limiting element current stabilization is the same as that of the first current limiting element current stabilization, and the details are not repeated herein.

Based on the same inventive concept, the disclosure also provides a battery control method, which is applied to any one of the battery protection board circuits.

FIG. 5 is a flow chart illustrating a battery control method according to an exemplary embodiment. As shown in fig. 5, the battery control method includes the following steps S11 to S12.

In step S11, a first detection voltage of the first battery and a second detection voltage of the second battery are monitored by the current protection circuit.

In the disclosed embodiment, the current protection circuit is a circuit for protecting the safety of the battery protection board circuit. Namely, when the first battery or the second battery releases the overcharge protection state and releases the pulse current, the current stabilization treatment can be carried out on the released pulse current through the current protection circuit, so that the situation that the pulse current is large and the use safety of the battery is influenced is avoided.

In the charging or discharging process, under the condition that the first battery or the second battery in the current battery protection board circuit is determined to be in the overcharge protection state, the overcharge protection state is relieved for timely finding out the first battery or the second battery in the overcharge protection state, the released pulse current is subjected to current stabilization treatment timely, and the first detection voltage of the first battery and the second detection voltage of the second battery are monitored respectively to achieve the purpose of protecting the battery protection board circuit.

In step S12, in response to the voltage difference between the first detection voltage and the second detection voltage being greater than the first voltage difference threshold, a current stabilization process is performed on the battery with the greater detection voltage of the first battery and the second battery.

In the embodiment of the present disclosure, the first voltage difference threshold may be understood as a minimum voltage difference used for measuring whether the first battery or the second battery in the overcharge protection state releases the overcharge protection state. If the voltage difference between the first detection voltage and the second detection voltage is greater than the voltage difference threshold, the first battery or the second battery which is in the overcharge protection state is characterized to be capable of releasing the overcharge protection state, and a larger pulse current can be generated at the moment. In order to avoid the generated pulse current to burn out a battery protection board circuit and influence the use safety of the battery, when the voltage difference between the first detection voltage and the second detection voltage is determined to be greater than the voltage difference threshold value, the battery with the larger detection voltage in the first battery and the second battery is subjected to current stabilization treatment, and then the safety accident influence caused by the pulse current is eliminated in time, so that the use safety of the battery is improved. In one example, when the battery is in the overcharge protection state, the voltage difference between the first detection voltage and the second detection voltage is much larger than the voltage difference that the first battery and the second battery can be charged or discharged simultaneously. Therefore, the battery with the higher detection voltage of the first battery and the second battery can be understood as the battery with the over-charge protection released.

Through the embodiment, in the process of charging or discharging the battery protection board circuit, the first detection voltage of the first battery and the second detection voltage of the second battery can be monitored through the current protection circuit, and when the voltage difference between the first detection voltage and the second detection voltage is larger than the voltage difference threshold value, the pulse current generated by the battery with the larger detection voltage in the first battery and the second battery is subjected to current stabilization treatment in time, so that the situation that the battery protection board circuit is damaged by instant release of the first battery or the second battery with the larger voltage when the overcharge protection state is removed is avoided, and the use safety of the battery is improved.

In an example, if the voltage difference between the first detection voltage and the second detection voltage is less than or equal to the voltage difference threshold, it is indicated that the first battery or the second battery in the overcharge protection state is still in the overcharge protection state, and the voltage reduction process needs to be continued.

In one embodiment, the current protection circuit includes a dual channel voltage comparator, a first current regulator circuit and a second current regulator circuit. The dual-channel voltage comparator is used for detecting the first detection voltage and the second detection voltage and further determining the voltage difference between the first detection voltage and the second detection voltage. The first current stabilizing circuit is used for performing current stabilizing treatment on the pulse current released by the first battery when the overcharge protection state of the first battery is removed. And the second current stabilizing circuit is used for performing current stabilizing treatment on the pulse current released by the second battery when the overcharge protection state of the second battery is relieved.

And determining the battery needing to be subjected to current stabilization, and respectively determining a first detection voltage and a second detection voltage through a dual-channel voltage comparator so as to determine the voltage difference between the first detection voltage and the second detection voltage. And comparing the obtained voltage difference with a voltage difference threshold value. If the voltage difference is determined to be larger than the voltage difference threshold value and the first detection voltage is larger than the second detection voltage, the first battery is represented as the battery with the overcharge protection removed, and then the first battery is subjected to current stabilization through the first current stabilization circuit. If the voltage difference is determined to be larger than the voltage difference threshold value and the first detection voltage is larger than the second detection voltage, the second battery is represented as the battery with the overcharge protection removed, and then the second battery is subjected to current stabilization processing through the second current stabilization circuit.

In another embodiment, the first current stabilizing circuit comprises a first current limiting element and a first field effect transistor, and the second current stabilizing circuit comprises a second current limiting element and a second field effect transistor. When the first battery and the second battery are in normal charging or discharging, the first field effect transistor is in a closed state and short-circuits the first current limiting element, and the second field effect transistor is in a closed state and short-circuits the second current limiting element, so that the terminal can be normally and instantly pulled and the impedance of a line is reduced.

When the first battery needs to be subjected to current stabilization treatment, the first field effect transistor is controlled to be cut off, the second field effect transistor is controlled to be conducted, the first battery is subjected to current stabilization treatment through the first current limiting element, and the first current limiting element is utilized to absorb pulse current released by the first battery, so that the situation that the pulse current is large and a battery protection board circuit is damaged is avoided.

When the second battery needs to be subjected to current stabilization treatment, the second field effect transistor is controlled to be cut off, the first field effect transistor is controlled to be conducted, the second battery is subjected to current stabilization treatment through the second current limiting element, and the second current limiting element is utilized to absorb pulse current released by the second battery, so that the situation that the pulse current is large and a battery protection board circuit is damaged is avoided.

FIG. 6 is a flow chart illustrating another battery control method according to an exemplary embodiment. As shown in fig. 6, the battery control method includes the following steps.

In step S21, a first detection voltage of the first battery and a second detection voltage of the second battery are monitored by the current protection circuit.

In step S22, in response to the voltage difference between the first detection voltage and the second detection voltage being greater than the first voltage difference threshold, a voltage difference between the first detection voltage and the second detection voltage is determined by the dual-channel voltage comparator.

In step S231, in response to the voltage difference being greater than the first voltage difference threshold and the first detection voltage being greater than the second detection voltage, the first fet is controlled to be turned off, the second fet is controlled to be turned on, and the first battery is subjected to a current stabilization process by the first current limiting element.

In step S232, in response to that the voltage difference is greater than the first voltage difference threshold and the second detection voltage is greater than the first detection voltage, the second fet is controlled to be turned off, the first fet is controlled to be turned on, and the second battery is subjected to current stabilization through the second current limiting element.

In step S24, in response to that the voltage difference between the first detection voltage and the second detection voltage is less than or equal to the second voltage difference threshold, the second fet is controlled to be turned on, and the first fet is controlled to be turned on.

In the embodiment of the present disclosure, the second voltage difference threshold may be understood as a minimum voltage difference that the first battery and the second battery are both in a normal state and can be charged or normally discharged at the same time. And in response to the fact that the voltage difference between the first detection voltage and the second detection voltage is smaller than or equal to the second voltage difference threshold value, the first battery and the second battery are both represented to be in a normal state, and in order to guarantee the charging power or the discharging power of the battery protection board circuit, the second field effect transistor is controlled to be conducted, and the first field effect transistor is controlled to be conducted, so that the first battery and the second battery can be charged or discharged simultaneously.

Through the embodiment, the requirements of charging or discharging the first battery and the second battery simultaneously can be met under the condition of ensuring the use safety of the battery protection board circuit, and then the high-power load of the battery protection board circuit is ensured.

In yet another embodiment, the first current limiting element may be a first inductor or a first thermistor. The second current limiting element may be a second inductor or a second thermistor.

In an implementation scenario, taking fig. 4 as an example, if the first current limiting element is a first inductor and the second current limiting element is a second inductor, the battery protection board circuit may be controlled by the following battery control method.

The current of the inductor can not change suddenly and the equivalent resistance exists. Therefore, when the battery protection board circuit is charged or discharged normally, the output pins OUTA and OUTB of the dual-channel voltage comparator output high levels, the first MOS transistor GA is closed, and the first inductor is short-circuited; the second MOS transistor GB is closed and short-circuits the second inductor. Therefore, the normal instant load of the terminal can be ensured and the impedance of the line can be reduced in the charging or discharging process of the terminal.

And if the first battery or the second battery enters the overcharge protection state, determining the battery with larger detection voltage through the voltage comparator. And when the voltage difference between the first detection voltage and the second detection voltage is greater than a first voltage threshold (0.65V (adjustable)), if the battery with the larger detection voltage is the first battery, the first field effect transistor is cut off, and the first inductor is connected to a power loop of the first battery. When the voltage difference reaches 0.7V, the instantaneous pulse large current can be absorbed by the first inductor connected in series, and the released pulse current can be gradually increased through the inductor until being stable. The discharge time of the pulse current is usually extremely short, for example: after the first inductor is connected to the loop 10s, the first MOS transistor connected in parallel is closed again by the voltage comparator, and the current of the first inductor gradually becomes 0. If the battery with larger detection voltage is the second battery, the second field effect transistor is cut off, and the second inductor is connected to a power loop of the second battery. When the voltage difference reaches 0.7V, the instantaneous pulse large current can be absorbed by the inductor L connected in series, and the released pulse current can be gradually increased through the inductor until the pulse current is stable. After the second inductor is connected to the loop 10s, the second MOS transistor connected in parallel is closed again by the voltage comparator, and the current of the second inductor is gradually 0. And then the first battery and the second battery can normally supply power to the terminal through the non-inductive loop.

In another implementation scenario, taking fig. 4 as an example, if the first current limiting element is a first thermistor and the second current limiting element is a second thermistor, the battery protection board circuit can be controlled by the following battery control method.

Since the NTC itself is a large resistance. Therefore, when the battery protection board circuit is normally charged or discharged, the output pins OUTA and OUTB of the dual-channel voltage comparator output high levels, the first MOS transistor GA is closed, and the first inductor is short-circuited; the second MOS transistor GB is closed and short-circuits the second inductor. Therefore, the normal instant load of the terminal can be ensured and the impedance of a line can be reduced in the charging or discharging process of the terminal.

And if the first battery or the second battery enters the overcharge protection state, determining the battery with larger detection voltage through the voltage comparator. And when the voltage difference between the first detection voltage and the second detection voltage is larger than a first voltage threshold (0.65V (adjustable)), if the battery with larger detection voltage is the first battery, the first field effect transistor is cut off, and the first thermistor is connected to a power loop of the first battery. When the voltage difference reaches 0.7V, the pulse current generated instantly flows through the first thermistor, and is absorbed by the first thermistor, and the resistance value of the first thermistor is reduced when the first thermistor heats, so that the system current is gradually recovered to be normal. Because the pulse time is short, and in order to ensure the load efficiency, the voltage comparator can be controlled to close the first MOS transistor after the first MOS transistor is disconnected for 10s, so that the first battery and the second battery can normally supply power to the terminal through the non-inductive loop. If the battery with larger detection voltage is the second battery, the second field effect transistor is cut off, and the second thermistor is connected to a power loop of the second battery. When the voltage difference reaches 0.7V, the pulse current generated instantly flows through the second thermistor, and is absorbed by the second thermistor, and meanwhile, the resistance value of the second thermistor is also reduced when the second thermistor heats, so that the system current is gradually recovered to be normal. Because the pulse time is short, and in order to ensure the load efficiency, the voltage comparator can be controlled to close the second MOS tube after the second MOS tube is disconnected for 10s, so that the second battery and the second battery can normally supply power to the terminal through the non-inductive loop.

Based on the same conception, the embodiment of the disclosure also provides a battery control device applied to the battery protection board circuit.

It is understood that the battery control device provided by the embodiment of the present disclosure includes a hardware structure and/or a software module for performing each function in order to implement the above functions. The disclosed embodiments can be implemented in hardware or a combination of hardware and computer software, in combination with the exemplary elements and algorithm steps disclosed in the disclosed embodiments. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the subject matter of the embodiments of the present disclosure.

FIG. 7 is a block diagram illustrating a battery control apparatus according to an exemplary embodiment. Referring to fig. 7, the battery control apparatus 100 includes a monitoring unit 101 and a control unit 102.

The monitoring unit 101 is configured to monitor a first detection voltage of the first battery and a second detection voltage of the second battery through the current protection circuit.

And the control unit 102 is configured to perform current stabilization processing on a battery with a larger detection voltage in the first battery and the second battery in response to that a voltage difference between the first detection voltage and the second detection voltage is greater than a first voltage difference threshold.

In one embodiment, the current protection circuit includes a dual channel voltage comparator, a first current regulator circuit and a second current regulator circuit. The control unit 102 performs current stabilization processing on the battery with a higher detection voltage in the first battery and the second battery in the following manner: a voltage difference between the first detected voltage and the second detected voltage is determined by a dual channel voltage comparator. And responding to the voltage difference larger than the first voltage difference threshold value and the first detection voltage larger than the second detection voltage, and performing current stabilization processing on the first battery through the first current stabilization circuit. And responding to the voltage difference larger than the first voltage difference threshold value and the second detection voltage larger than the first detection voltage, and performing current stabilization treatment on the second battery through a second current stabilization circuit.

In another embodiment, the first current stabilizing circuit comprises a first current limiting element and a first field effect transistor, and the second current stabilizing circuit comprises a second current limiting element and a second field effect transistor. The control unit 102 performs current stabilization processing on the first battery through the first current stabilization circuit in the following manner: and controlling the first field effect transistor to be cut off, controlling the second field effect transistor to be switched on, and carrying out current stabilization treatment on the first battery through the first current limiting element. The control unit 102 performs current stabilization processing on the second battery through the second current stabilization circuit in the following manner: and controlling the second field effect transistor to be cut off, controlling the first field effect transistor to be conducted, and carrying out current stabilization treatment on the second battery through the second current limiting element.

In another embodiment, the control unit 102 is further configured to: and controlling the second field effect transistor to be conducted and controlling the first field effect transistor to be conducted in response to the fact that the voltage difference between the first detection voltage and the second detection voltage is smaller than or equal to the second voltage difference threshold value.

With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.

FIG. 8 is a block diagram illustrating a battery control apparatus according to an exemplary embodiment. For example, the battery control apparatus 200 may be a mobile phone, a computer, a digital broadcasting terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.

Referring to fig. 8, the battery control apparatus 200 may include one or more of the following components: a processing component 202, a memory 204, a power component 206, a multimedia component 208, an audio component 210, an input/output (I/O) interface 212, a sensor component 214, and a communication component 216.

The processing component 202 generally controls the overall operation of the battery control apparatus 200, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 202 may include one or more processors 220 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 202 can include one or more modules that facilitate interaction between the processing component 202 and other components. For example, the processing component 202 may include a multimedia module to facilitate interaction between the multimedia component 208 and the processing component 202.

The memory 204 is configured to store various types of data to support operations at the battery control apparatus 200. Examples of such data include instructions for any application or method operating on the battery control device 200, contact data, phonebook data, messages, pictures, videos, and the like. The memory 204 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.

The power component 206 provides power to the various components of the battery control apparatus 200. Power components 206 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for battery control device 200.

The multimedia component 208 includes a screen that provides an output interface between the battery control device 200 and the 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 208 includes a front facing camera and/or a rear facing camera. When the battery control apparatus 200 is in an operation mode, such as a photographing mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. 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 210 is configured to output and/or input audio signals. For example, the audio component 210 includes a Microphone (MIC) configured to receive an external audio signal when the battery control apparatus 200 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 204 or transmitted via the communication component 216. In some embodiments, audio component 210 also includes a speaker for outputting audio signals.

The I/O interface 212 provides an interface between the processing component 202 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.

The sensor assembly 214 includes one or more sensors for providing various aspects of state estimation for the battery control apparatus 200. For example, the sensor assembly 214 may detect the open/closed status of the battery control apparatus 200, the relative positioning of components, such as a display and keypad of the battery control apparatus 200, the sensor assembly 214 may also detect a change in position of the battery control apparatus 200 or a component of the battery control apparatus 200, the presence or absence of user contact with the battery control apparatus 200, orientation or acceleration/deceleration of the battery control apparatus 200, and a change in temperature of the battery control apparatus 200. The sensor assembly 214 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 214 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 214 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 216 is configured to facilitate wired or wireless communication between the battery control apparatus 200 and other devices. The battery control device 200 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 216 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 216 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 battery control apparatus 200 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 for performing any one of the above-described battery control methods.

In an exemplary embodiment, a non-transitory computer readable storage medium comprising instructions, such as the memory 204 comprising instructions, executable by the processor 220 of the battery control apparatus 200 to perform the above-described method 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.

It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," etc. are used interchangeably throughout. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

It will be further understood that, unless otherwise specified, "connected" includes direct connections between the two without the presence of other elements, as well as indirect connections between the two with the presence of other elements.

It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.

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 that have been 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 to be limited only by the scope of the appended claims.

Claims

1. A battery protection board circuit is characterized by comprising a first battery, a second battery and a current protection circuit which are connected in parallel with each other;

the current protection circuit is used for performing current stabilization treatment on a battery with a higher detection voltage in the first battery and the second battery when the voltage difference between the first battery and the second battery is greater than a first voltage difference threshold value.

2. The battery protection board circuit of claim 1, wherein the current protection circuit comprises:

a first current stabilization circuit connected in series with a power loop of the first battery;

the second current stabilizing circuit is connected with the power loop of the second battery in series;

and a first input pin of the double-channel voltage comparator is connected with a detection pin of the first battery, a first output pin of the double-channel voltage comparator is connected with the first current stabilizing circuit, a second input pin of the double-channel voltage comparator is connected with a detection pin of the second battery, and a second output pin of the double-channel voltage comparator is connected with the second current stabilizing circuit.

3. The battery protection board circuit according to claim 2,

the first current stabilization circuit includes: the current limiter comprises a first current limiting element and a first field effect transistor, wherein the first current limiting element is connected with the first field effect transistor in parallel;

the second current stabilization circuit includes: the second current limiting element is connected with the second field effect transistor in parallel.

4. The battery protection board circuit of claim 3,

the first current limiting element includes: a first inductor or a first thermistor;

the second current limiting element includes: a second inductor or a second thermistor.

5. A battery control method applied to a battery protection board circuit including a first battery, a second battery, and a current protection circuit connected in parallel to each other, the battery control method comprising:

monitoring, by the current protection circuit, a first detected voltage of the first battery and a second detected voltage of the second battery;

and responding to the fact that the voltage difference between the first detection voltage and the second detection voltage is larger than a first voltage difference threshold value, and performing current stabilization processing on the battery with the larger detection voltage in the first battery and the second battery.

6. The battery control method of claim 5, wherein the current protection circuit comprises a dual-channel voltage comparator, a first current stabilization circuit and a second current stabilization circuit;

the current stabilization treatment is carried out to the battery that detects voltage great in first battery and the second battery, include:

determining, by the two-channel voltage comparator, a voltage difference between the first detection voltage and the second detection voltage;

responding to the voltage difference being larger than a first voltage difference threshold value and the first detection voltage being larger than the second detection voltage, and performing current stabilization processing on the first battery through the first current stabilization circuit;

and responding to the fact that the voltage difference is larger than a first voltage difference threshold value and the second detection voltage is larger than the first detection voltage, and performing current stabilization processing on the second battery through the second current stabilization circuit.

7. The battery control method according to claim 6, wherein the first current stabilization circuit includes a first current limiting element and a first field effect transistor, and the second current stabilization circuit includes a second current limiting element and a second field effect transistor;

the current stabilization processing is performed on the first battery through the first current stabilization circuit, and the current stabilization processing includes:

controlling the first field effect transistor to be cut off, controlling the second field effect transistor to be conducted, and carrying out current stabilization treatment on the first battery through the first current limiting element;

the current stabilization processing is performed on the second battery through the second current stabilization circuit, and the current stabilization processing includes:

and controlling the second field effect transistor to be cut off, controlling the first field effect transistor to be conducted, and performing current stabilization treatment on the second battery through the second current limiting element.

8. The battery control method according to claim 7, characterized by further comprising:

and controlling the second field effect transistor to be conducted and controlling the first field effect transistor to be conducted in response to the fact that the voltage difference between the first detection voltage and the second detection voltage is smaller than or equal to a second voltage difference threshold value.

9. A battery control device, characterized in that, is applied to a battery protection board circuit, the battery protection board circuit includes a first battery, a second battery and a current protection circuit connected in parallel to each other, the battery control device includes:

the monitoring unit is used for monitoring a first detection voltage of the first battery and a second detection voltage of the second battery through the current protection circuit;

and the control unit is used for responding to the fact that the voltage difference between the first detection voltage and the second detection voltage is larger than a first voltage difference threshold value, and performing current stabilization treatment on the battery with the larger detection voltage in the first battery and the second battery.

10. The battery control device of claim 9, wherein the current protection circuit comprises a dual channel voltage comparator, a first current regulator circuit and a second current regulator circuit;

the control unit performs current stabilization processing on a battery with a larger detection voltage in the first battery and the second battery by adopting the following mode:

11. The battery control device of claim 10, wherein the first current regulation circuit comprises a first current limiting element and a first field effect transistor, and the second current regulation circuit comprises a second current limiting element and a second field effect transistor;

the control unit carries out current stabilization processing on the first battery through the first current stabilization circuit by adopting the following mode:

controlling the first field effect transistor to be cut off, controlling the second field effect transistor to be conducted, and performing current stabilization treatment on the first battery through the first current limiting element;

the control unit carries out current stabilization treatment on the second battery through the second current stabilization circuit in the following mode:

and controlling the second field effect transistor to be cut off, controlling the first field effect transistor to be switched on, and carrying out current stabilization treatment on the second battery through the second current limiting element.

12. The battery control apparatus according to claim 11, wherein the control unit is further configured to:

and in response to the fact that the voltage difference between the first detection voltage and the second detection voltage is smaller than or equal to a second voltage difference threshold value, controlling the second field effect transistor to be conducted, and controlling the first field effect transistor to be conducted.

13. A battery control apparatus, characterized in that the battery control apparatus comprises:

a memory to store instructions; and

a processor for invoking the memory-stored instructions to perform the battery control method of any of claims 5-8.

14. A computer-readable storage medium having stored therein instructions which, when executed by a processor, perform a battery control method according to any one of claims 5 to 8.