Battery protection circuit and protection method thereof, circuit system, terminal and storage medium

Abstract

The embodiment of the invention discloses a battery protection circuit and a protection method thereof, a circuit system, a terminal and a storage medium. The battery protection circuit comprises a switch module and a control chip. The control chip, the first battery and the second battery are respectively connected with the switch module; the control chip is used for acquiring the battery capacity and / or charging information of the first battery and the second battery in real time, and outputting different electric signals according to the battery capacity and / or charging information of the first battery and the second battery; and the switch module is used for receiving the electric signal and switching on or switching off a switch in the switch module according to the electric signal, so that the first battery and the second battery are in a parallel connection state or a connection disconnection state. Therefore, the problems of over-charging and over-discharging of the second battery with relatively small battery capacity after the first battery and the second battery are connected in parallel can be prevented, and the stability and the reliability of charging or discharging of the battery pack are improved.

Description

Technical Field

[0001] The present embodiment relates to the field of battery technology, and in particular to a battery protection circuit and a protection method thereof, a circuit system, a terminal, and a storage medium. Background Art

[0002] For current foldable mobile phones, there is a hinge in the middle, so the developers will place the battery on both sides of the hinge. However, since there is space for the motherboard in the upper part of the mobile phone, the battery capacity in the upper part of the mobile phone is smaller than that in the lower part of the mobile phone, that is, the battery capacity on both sides of the hinge is quite different, and the ratio of large battery capacity to small battery capacity is usually about 3:1.

[0003] Understandably, since the two batteries disposed on both sides of the rotating shaft have different capacities, the charging and discharging currents of the large battery and the small battery are also different. Therefore, after the two batteries are connected in parallel, overcharging and over-discharging problems are likely to occur. Summary of the invention

[0004] Embodiments of the present application provide a battery protection circuit and a protection method thereof, a circuit system, a terminal, and a storage medium.

[0005] The embodiment of the present application provides a battery protection circuit. The battery pack includes a first battery and a second battery, the battery capacity of the first battery is greater than the battery capacity of the second battery; the battery protection circuit includes a switch module and a control chip, the first end of the switch module is connected to the first end of the control chip, the second end of the switch module is connected to the first end of the first battery, and the third end of the switch module is connected to the second battery; the second end of the control chip is connected to both the first battery and the second battery; the control chip is used to obtain the battery capacity and / or charging information of the first battery and the second battery in real time, and output different electrical signals according to the battery capacity and / or charging information of the first battery and the second battery; the switch module is used to receive the electrical signal, and according to the electrical signal, the switch in the switch module is turned on or off, so that the first battery and the second battery are in a parallel connection state or a disconnected state.

[0006] The embodiment of the present application provides a battery protection method, which applies the above-mentioned battery protection circuit, and the battery protection method is used for a battery pack. The battery pack includes a first battery and a second battery, and the battery capacity of the first battery is greater than the battery capacity of the second battery. The battery protection method includes: obtaining the battery capacity and / or charging information of the first battery and the second battery in real time through the control chip in the battery protection circuit, and outputting different electrical signals according to the battery capacity and / or charging information of the first battery and the second battery; receiving the electrical signal through the switch module in the battery protection circuit, and turning on or off the switch in the switch module according to the electrical signal, so that the first battery and the second battery are in a parallel connection state or a connection disconnection state.

[0007] The embodiment of the present application also provides a circuit system. The circuit system includes a battery pack, a charging chip, a power-consuming component and the above-mentioned battery protection circuit. The battery pack includes a first battery and a second battery, the battery capacity of the first battery is greater than the battery capacity of the second battery; the second battery is connected in parallel with the first battery through the battery protection circuit; the first end of the first battery is connected to the first end of the battery protection circuit, and the second battery is connected to the second end of the battery protection circuit; the second end of the first battery is connected to the power-consuming component to power the power-consuming component; the second end of the first battery is also connected to the charging chip to charge the first battery and the second battery through the charging chip.

[0008] The embodiments of the present application further provide a terminal, wherein the terminal includes the above-mentioned battery protection circuit or the above-mentioned circuit system.

[0009] The embodiment of the present application further provides a computer-readable storage medium. The computer-readable storage medium further includes a memory and a processor, the memory stores a computer program, and when the computer program is executed by the processor, the above-mentioned battery protection method is implemented.

[0010] In this way, the battery protection circuit and its protection method, circuit system, terminal and storage medium of each embodiment of the present application connect the first battery, the second battery and the control chip to the switch module respectively, and the control chip obtains the battery capacity and charging information of the first battery and the battery capacity and charging information of the second battery in real time to output different electrical signals according to the battery capacity and charging information. The switch module controls the switch in the switch module to be turned on or off according to the received electrical signal, so that the first battery and the second battery are in a parallel connection state or a disconnected state, thereby preventing the second battery with a smaller battery capacity from overcharging and over-discharging after the first battery and the second battery are connected in parallel, thereby improving the stability and reliability of charging or discharging of the battery pack.

[0011] Additional aspects and advantages of the present embodiment will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and / or additional aspects and advantages of the present embodiment will become apparent and easily understood from the description of the embodiment in conjunction with the following drawings, in which:

[0013] Figure 1 is a schematic diagram of connection between a battery and a battery protection circuit in a battery pack according to an embodiment of the present application;

[0014] Figure 2 is a schematic diagram of connection between a battery and a battery protection circuit in a battery pack according to another embodiment of the present application;

[0015] Figure 3 is a structural schematic diagram of a switch module in a battery protection circuit in certain embodiments of the present application;

[0016] Figure 4 is a flowchart of a battery protection method according to certain embodiments of the present application;

[0017] Figure 5 is a schematic diagram of the structure of a battery protection device according to certain embodiments of the present application;

[0018] Figure 6 It is a schematic diagram of the structure of the circuit system of certain embodiments of the present application. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, and the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present invention, and cannot be understood as limiting the embodiments.

[0020] For current foldable mobile phones, there is a hinge in the middle, so the developers will place the battery on both sides of the hinge. However, since the upper part of the mobile phone also has space for the motherboard, the battery capacity of the upper part of the mobile phone is smaller than that of the lower part of the mobile phone, that is, the battery capacity of the two sides of the hinge is quite different, and the ratio of the large battery capacity to the small battery capacity is usually about 3:1.

[0021] Understandably, since the two batteries disposed on both sides of the rotating shaft have different capacities, the charging and discharging currents of the large battery and the small battery are also different. Therefore, after the two batteries are connected in parallel, overcharging and over-discharging problems are likely to occur.

[0022] In the related art, the following two solutions are often used to prevent overcharging and over-discharging problems when charging small batteries.

[0023] Solution 1: Since the capacity ratio of large and small batteries is about 3:1, and the internal resistance of batteries in the same system is basically around 3:1, this solution strictly controls the impedance from the charging chip to the large and small batteries to 3:1, so that the charging current and discharge current of the two batteries are also around 3:1, which can basically achieve simultaneous full charge and simultaneous discharge. However, in the solution of Solution 1, as the battery ages with the use time, the internal resistance will also change accordingly, and the change of the internal resistance of the two batteries is not linear, so there will be problems such as large and small batteries cannot be fully charged at the same time, or the small battery will be overcharged or over-discharged. In addition, there are often fast charging chips and general charging chips on the motherboard. The two charging circuits and charging chips are independent, and there is no way to accurately control the impedance of the two charging chips to the battery to 3:1. Therefore, in some special scenarios, one of the batteries will have overcharge or over-discharge problems, and in serious cases, it will affect the battery life and user experience.

[0024] Solution 2: Considering that the charging and discharging currents of the large battery are greater than those of the small battery, this solution will connect a current limiting chip in series at the small battery end to prevent the small battery from overcharging or over-discharging. The current limiting chip can limit the current entering the small battery to achieve simultaneous full charge and discharge. However, in this solution, although adding a current limiting chip at the small battery end can timely control the charging and discharging currents of the small battery, the current limiting chip only converts the current and power consumption into heat and dissipates it, which will generate a lot of heat. In addition, the cost of the current limiting chip is relatively high, which is not only not conducive to environmental protection, but also affects the user experience.

[0025] In view of this, please refer to Figure 1, this embodiment provides a battery protection circuit 100, which is used for a battery pack 200. The battery pack 200 includes a first battery 210 and a second battery 230. The battery capacity of the first battery 210 is greater than the battery capacity of the second battery 230. The battery protection circuit 100 includes a switch module 10 and a control chip 30. The first end VBAT1_CHG_ON of the switch module 10 is connected to the first end of the control chip 30, the second end VBAT0 of the switch module 10 is connected to the first end of the first battery 210, and the third end VBAT1 of the switch module 10 is connected to the second battery 230. The second end of the control chip 30 is connected to both the first battery 210 and the second battery 230. The control chip 30 is used to obtain the battery capacity and / or charging information of the first battery 210 and the second battery 230 in real time, and output different electrical signals according to the battery capacity and / or charging information of the first battery 210 and the second battery 230. The switch module 10 is used to receive an electrical signal and turn on or off a switch in the switch module 10 according to the electrical signal, so that the first battery 210 and the second battery 230 are in a parallel connection state or a disconnection state.

[0026] The battery capacity may be, for example, 2500mAh, 2800mAh, 3000mAh, 3200mAh, 3400mAh, 3600mAh, 3800mAh, 4000mAh, 4200mAh and 4500mAh, without limitation herein. The electrical signal may include a low level signal and a high level signal.

[0027] The control chip 30 is used to obtain the battery capacity and / or charging information of the first battery 210 and the second battery 230 in real time, and output different electrical signals according to the battery capacity and / or charging information of the first battery 210 and the second battery 230, including the following three situations: (1) The control chip 30 is used to obtain the battery capacity of the first battery 210 and the second battery 230 in real time, and output different electrical signals according to the battery capacity of the first battery 210 and the second battery 230. (2) The control chip 30 is used to obtain the charging information of the first battery 210 and the second battery 230 in real time, and output different electrical signals according to the battery capacity of the first battery 210 and the second battery 230. (3) The control chip 30 is used to obtain the battery capacity and charging information of the first battery 210 and the second battery 230 in real time, and output different electrical signals according to the battery capacity and charging information of the first battery 210 and the second battery 230.

[0028] For example, when the control chip 30 obtains the battery capacity and charging information of the first battery 210 and the second battery 230 in real time, the control chip 30 can output a low-level signal based on the obtained battery capacity and charging information of the first battery 210 and the second battery 230. At this time, the switch module 10 receives the low-level signal and disconnects the switch in the switch module 10 according to the low-level signal, so that the first battery 210 and the second battery 230 are in a disconnected state.

[0029] For another example, when the control chip 30 obtains the battery capacity and charging information of the first battery 210 and the second battery 230 in real time, the control chip 30 can output a high-level signal based on the obtained battery capacity and charging information of the first battery 210 and the second battery 230. At this time, the switch module 10 receives the high-level signal and turns on the switch in the switch module 10 according to the high-level signal, so that the first battery 210 and the second battery 230 are in a parallel connection state.

[0030] In this way, the battery protection circuit 100 of the present application connects the first battery 210, the second battery 230 and the control chip 30 to the switch module 10 respectively. The control chip 30 obtains the battery capacity and charging information of the first battery 210 and the battery capacity and charging information of the second battery 230 in real time to output different electrical signals according to the battery capacity and charging information. The switch module 10 controls the switch in the switch module 10 to be turned on or off according to the received electrical signal, so that the first battery 210 and the second battery 230 are in a parallel connection state or a disconnection state, thereby preventing the second battery 230 with a smaller battery capacity from being overcharged or over-discharged after the first battery 210 and the second battery 230 are connected in parallel, thereby improving the stability and reliability of charging or discharging of the battery pack 200.

[0031] In addition, the battery protection circuit 100 of the present application obtains the battery capacity and charging information of the battery in the battery pack 200 in real time through the control chip 30, so as to output different electrical signals according to the battery capacity and charging information of the battery in the battery pack 200, and control the switch in the switch module 10 to turn on or off, so that the first battery 210 and the second battery 230 are in a parallel connection state or a disconnected state. Compared with the solution 1 in the related art, the present application enhances the user's charging time experience and strengthens the protection against overcharging and over-discharging of the battery. Compared with the solution 2 in the related art, the present application reduces the solution cost and does not generate too much heat, which is beneficial to environmental protection.

[0032] In some embodiments, the charging information includes the voltage across the first battery 210 and the voltage across the second battery 230. The control chip 30 is further used to calculate the voltage difference between the first battery 210 and the second battery 230 according to the voltage across the first battery 210 and the voltage across the second battery 230, and output a first signal when the voltage difference is greater than or equal to a preset threshold value to control the switch in the switch module 10 to be disconnected.

[0033] The first signal may refer to a low level signal, which is not limited here. The preset threshold may be, for example, 500mV, 520mV, 540mV, 560mV, 580mV, 600mV, 620mV, 640mV, 660mV, 680mV or 700mV, which is not limited here.

[0034] Specifically, the present application is described with a preset threshold of 600mV. That is, when the control chip 30 obtains the voltage across the first battery 210 and the voltage across the second battery 230 in real time, the control chip 30 calculates that the voltage difference between the first battery 210 and the second battery 230 is 650mV based on the voltage across the first battery 210 and the voltage across the second battery 230. At this time, the control chip 30 outputs a low-level signal to control the switch in the switch module 10 to disconnect through the low-level signal, so that the first battery 210 and the second battery 230 are in a disconnected state.

[0035] In this way, the battery protection circuit 100 of the present application can obtain the voltage across the first battery 210 and the voltage across the second battery 230 in real time through the control chip 30, and calculate the voltage difference between the first battery 210 and the second battery 230 based on the voltage across the first battery 210 and the voltage across the second battery 230. When the voltage difference is greater than or equal to the preset threshold, the first signal is output to control the switch in the switch module 10 to disconnect, so as to prevent the second battery 230 from over-discharging, thereby improving the charging stability, reliability and user charging experience.

[0036] In some embodiments, the control chip 30 is further configured to output a second signal to control the switch in the switch module 10 to be turned on when the voltage difference is less than a preset threshold.

[0037] Specifically, the second signal may be a high-level signal. When the control chip 30 obtains the voltage across the first battery 210 and the voltage across the second battery 230 in real time, the control chip 30 calculates that the voltage difference between the first battery 210 and the second battery 230 is 550 mV based on the voltage across the first battery 210 and the voltage across the second battery 230. At this time, the control chip 30 outputs a high-level signal to control the switch in the switch module 10 to be turned on through the high-level signal, so that the first battery 210 and the second battery 230 are in a parallel connection state.

[0038] In this way, the battery protection circuit 100 of the present application can obtain the voltage across the first battery 210 and the voltage across the second battery 230 in real time through the control chip 30, and calculate the voltage difference between the first battery 210 and the second battery 230 based on the voltage across the first battery 210 and the voltage across the second battery 230. When the voltage difference is less than a preset threshold, the second signal is output to control the switch in the switch module 10 to be turned on, so that the first battery 210 and the second battery 230 can power the system.

[0039] In some embodiments, the charging information also includes the charging stage of the first battery 210 and the charging stage of the second battery 230. The control chip 30 is also used to output a first signal when the charging stage of the first battery 210 and the charging stage of the second battery 230 are not simultaneous, and control the switch in the switch module 10 to be disconnected.

[0040] Among them, the charging stage may include a fast charging stage and a constant voltage charging stage.

[0041] For example, when the control chip 30 obtains in real time that the first battery 210 is in the fast charging stage and the second battery 230 is in the constant voltage charging stage, the control chip 30 outputs a first signal to control the switch in the switch module 10 to disconnect, so that the first battery 210 and the second battery 230 are in a disconnected state.

[0042] In this way, the battery protection circuit 100 of the present application can obtain the charging stage of the first battery 210 and the charging stage of the second battery 230 in real time through the control chip 30, and when the charging stage of the first battery 210 is different from the charging stage of the second battery 230, it outputs a first signal to control the switch in the switch module 10 to disconnect, so as to prevent the second battery 230 from overcharging, thereby improving the charging stability, reliability and user charging experience.

[0043] In some embodiments, the control chip 30 is further configured to output a second signal to control the switch in the switch module 10 to be turned on when the charging stage of the first battery 210 and the charging stage of the second battery 230 are the same.

[0044] For example, when the control chip 30 obtains in real time that the first battery 210 is in the fast charging stage and the second battery 230 is also in the fast charging stage, the control chip 30 outputs a second signal to control the switch in the switch module 10 to be turned on, so that the first battery 210 and the second battery 230 are in a parallel connection state.

[0045] In this way, the battery protection circuit 100 of the present application can obtain the charging stage of the first battery 210 and the charging stage of the second battery 230 in real time through the control chip 30, and when the charging stage of the first battery 210 is the same as the charging stage of the second battery 230, it outputs a second signal to control the switch in the switch module 10 to be turned on, so that the first battery 210 and the second battery 230 are both in the fast charging stage, so that the first battery 210 and the second battery 230 are restored to a parallel connection state, thereby improving the charging stability and reliability of the battery pack 200.

[0046] In some embodiments, the control chip 30 is further configured to output a first signal to control the switch in the switch module 10 to be disconnected when it is detected that the battery capacity of the second battery 230 reaches the rated battery capacity during the charging process.

[0047] Among them, the rated battery capacity can be, for example, 2000mAh, 2100mAh, 2200mAh, 2300mAh, 2400mAh, 2500mAh, 2600mAh, 2700mAh, 2800mAh and 2900mAh, without limitation here.

[0048] Specifically, the present application is described with a rated battery capacity of 2000mAh. That is, when the second battery 230 is in the charging stage and the control chip 30 detects that the battery capacity of the second battery 230 reaches 2000mAh, the control chip 30 outputs a first signal to control the switch in the switch module 10 to be disconnected, so that the first battery 210 and the second battery 230 are in a disconnected state.

[0049] In this way, the battery protection circuit 100 of the present application controls the battery capacity of the second battery 230 in real time through the control chip 30, and outputs a first signal when the battery capacity of the second battery 230 reaches the rated battery capacity, and controls the switch in the switch module 10 to disconnect, so as to prevent the second battery 230 from overcharging, thereby improving the charging stability, reliability and user charging experience.

[0050] In some embodiments, the control chip 30 is further configured to output a first signal to control the switch in the switch module 10 to be disconnected when it is detected that the discharge capacity of the second battery 230 is less than the rated battery capacity during the discharge process.

[0051] Specifically, when the second battery 230 is in the discharge stage and the control chip 30 detects that the battery capacity of the second battery 230 is less than 2000 mAh, the control chip 30 outputs a first signal to control the switch in the switch module 10 to disconnect, so that the first battery 210 and the second battery 230 are in a disconnected state.

[0052] In this way, the battery protection circuit 100 of the present application controls the battery capacity of the second battery 230 in real time through the control chip 30, and outputs a second signal when the battery capacity of the second battery 230 is less than the rated battery capacity, controls the switch in the switch module 10 to be disconnected, so that the second battery 230 ends discharging, avoids over-discharge of the second battery 230, and improves the user's charging experience.

[0053] See also Figure 2 In some embodiments, the battery protection circuit 100 further includes an abnormality detection module 50. The input end of the abnormality detection module 50 is connected to both the first battery 210 and the second battery 230, and the output end of the abnormality detection module 50 is connected to the first end VBAT1_CHG_ON of the switch module 10. The abnormality detection module 50 is used to detect whether an abnormality occurs in the battery in the battery pack 200, and output a third signal when an abnormality occurs in the battery in the battery pack 200, and control the switch in the switch module 10 to disconnect.

[0054] The abnormal situation of the battery in the battery pack 200 may include that the first battery 210 or the second battery 230 is a non-standard battery, the first battery 210 or the second battery 230 is damaged, the first battery 210 and the second battery 230 are both non-standard batteries, and the first battery 210 and the second battery 230 are both damaged, which are not limited here. It should be noted that the non-standard battery refers to a battery that does not meet the production standards.

[0055] That is, when the abnormality detection module 50 detects that the first battery 210 in the battery pack 200 or the first battery 210 has an abnormality, the abnormality detection module 50 outputs a third signal to the switch module 10 to control the switch in the switch module 10 to disconnect through the third signal to prevent the first battery 210 and the second battery 230 from short-circuiting and burning out after being connected in parallel.

[0056] In this way, the abnormality detection module 50 of the battery protection circuit 100 of the present application can detect abnormal conditions of the batteries in the battery pack 200, and when an abnormal condition is detected in the batteries of the battery pack 200, it controls the switch in the switch module 10 to disconnect by outputting a third signal to prevent the batteries in the battery pack 200 from being short-circuited and burned out in parallel.

[0057] See also Figure 3 In some embodiments, the switch module 10 includes a first switch V01, a second switch V02, and a third switch V03. The first switch V01 is connected to the control chip 30, that is, the first switch V01 is connected to the control chip 30 through Figure 3 The VBAT1_CHG_ON terminal in the circuit is connected to the control chip 30, the first terminal of the second switch V02 is connected to the first switch V01, and the second terminal of the second switch V02 is connected to the first battery 210, that is, the second switch V02 is connected to the first battery 210 through Figure 3The VBAT0 terminal in the circuit is connected to the first battery 210. The first terminal of the third switch V03 is connected to the first switch V01, and the third terminal of the third switch V03 is connected to the second battery 230. That is, the third switch V03 is connected to the first battery 210 through Figure 3 The VBAT1 terminal in the switch module is connected to the second battery 230. That is, the control chip 30 of the present application can obtain the battery capacity and / or charging information of the first battery 210 and the second battery 230 in real time, and output different electrical signals according to the battery capacity and / or charging information of the first battery 210 and the second battery 230, so as to control the disconnection or conduction of the first switch V01, the second switch V02 and the third switch V03 in the switch module through different electrical signals, so that the first battery 210 and the second battery 230 are in a parallel connection state or a connection disconnection state.

[0058] For example, when the first battery 210 and the second battery 230 are in a discharging state, and the voltage difference between the first battery 210 and the second battery 230 is greater than a preset threshold, the control chip 30 outputs a first signal to control the first switch V01 to be disconnected. At this time, the voltages of the gate of the second switch V02 and the gate of the third switch V03 are pulled up, and the second switch V02 and the third switch V03 are both disconnected, so that the first battery 210 and the second battery 230 are in a disconnected state to prevent the second battery 230 from being over-discharged.

[0059] When the first battery 210 and the second battery 230 are in a discharging state, and the voltage difference between the first battery 210 and the second battery 230 is less than a preset threshold, the control chip 30 outputs a second signal to control the first switch V01 to be turned on. At this time, the voltages of the gate of the second switch V02 and the gate of the third switch V03 are pulled down, and the second switch V02 and the third switch V03 are both turned on, so that the first battery 210 and the second battery 230 are in a parallel connection state, so that the system is powered by the first battery 210 and the second battery 230.

[0060] When the first battery 210 and the second battery 230 are in a charging state, and the charging stage of the first battery 210 is different from the charging stage of the second battery 230, the control chip 30 outputs a first signal to control the first switch V01 to be disconnected. At this time, the voltage of the gate of the second switch V02 and the gate of the third switch V03 are pulled high, and the second switch V02 and the third switch V03 are both disconnected, so that the first battery 210 and the second battery 230 are in a disconnected state to prevent the second battery 230 from being overcharged.

[0061] When the first battery 210 and the second battery 230 are in a charging state, and the charging stage of the first battery 210 is the same as the charging stage of the second battery 230, the control chip 30 outputs a second signal to control the first switch V01 to be turned on. At this time, the voltage of the gate of the second switch V02 and the gate of the third switch V03 are pulled down, and the second switch V02 and the third switch V03 are both turned on, so that the first battery 210 and the second battery 230 are in a parallel connection state, so as to charge the second battery 230.

[0062] It should be noted that the first switch V01 may be an N-type MOS transistor, and the second switch V02 and the third switch V03 may be P-type MOS transistors, which are not limited here.

[0063] In this way, the battery protection circuit 100 of the present application obtains the battery capacity and charging information of the batteries in the battery pack 200 in real time through the control chip 30, so as to output different electrical signals according to the battery capacity and charging information of the batteries in the battery pack 200, and control the first switch V01, the second switch V02 and the third switch V03 in the switch module 10 to be turned on or off, so as to flexibly control the connection status between the batteries in the battery pack 200, prevent the second battery 230 with a smaller battery capacity from being overcharged or over-discharged after the first battery 210 and the second battery 230 are connected in parallel, and improve the stability and reliability of charging or discharging of the battery pack 200.

[0064] See also Figure 3 In some embodiments, the battery protection circuit 100 further includes a balancing resistor R01, which is connected in parallel between the first battery 210 and the second battery 230. The balancing resistor R01 is used to balance the voltages of the first battery 210 and the second battery 230 when the switch in the switch module 10 is disconnected. That is, when the voltages between the first battery 210 and the second battery 230 are different, the balancing resistor R01 can play a role in voltage balancing. The resistance value of the balancing resistor R01 can be 100Ω, which is not limited here.

[0065] In addition, when the control chip 30 outputs the first signal to control the switch in the switch module 10 to be disconnected, so that the first battery 210 and the second battery 230 are in a disconnected state, the voltage of the first battery 210 and the second battery 230 can be balanced through the balancing resistor R01, thereby avoiding the problem that the second battery 230 with a smaller battery capacity in the battery pack 200 has a deeper discharge depth than the first battery 210 with a larger battery capacity each time it is discharged, resulting in a faster softening of the positive plate of the second battery 230.

[0066] In addition, if Figure 3As shown, the switch module 10 of the present application may also include a voltage stabilizing diode D01, a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4. In this way, by setting the voltage stabilizing diode D01 in the switch module 10, the present application can stabilize the high voltage or high current generated at the end of the first battery 210 when the first battery 210 and the second battery 230 are connected in parallel, and avoid the high voltage or high current generated at the moment of the first battery 210 and the second battery 230 being fastened together to damage other devices inside the terminal.

[0067] In detail, one end of the Zener diode D01 is connected to the first battery 210 , and the other end of the Zener diode D01 is grounded GND.

[0068] A first end of the first capacitor C1 is connected to the second switch V02 and the third switch V03 respectively, and a second end of the first capacitor C1 is grounded GND.

[0069] The first end of the second capacitor C2 is connected to the second switch V02, the third switch V03 and the first end of the first resistor R1 respectively, the second end of the second capacitor C2 is connected to the second end of the first resistor R1 and the first end of the second resistor R2 respectively, and the second end of the second resistor R2 is connected to the first switch V01.

[0070] A first end of the third resistor R3 is connected to the first switch V01 , a second end of the third resistor R3 is connected to a first end of the fourth resistor R4 and the control chip 30 , respectively, and a second end of the fourth resistor R4 is grounded GND.

[0071] In addition, the present application can enhance the reliability and stability of the battery protection circuit 100 by setting the first capacitor C1, the second capacitor C2, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 in the switch module 10.

[0072] See also Figure 4 This embodiment also provides a battery protection method, and is used for a battery pack 200, the battery pack 200 includes a first battery 210 and a second battery 230, and the battery capacity of the first battery 210 is greater than the battery capacity of the second battery 230. The battery protection method includes:

[0073] 01: The control chip in the battery protection circuit obtains the battery capacity and / or charging information of the first battery and the second battery in real time, and outputs different electrical signals according to the battery capacity and / or charging information of the first battery and the second battery.

[0074] 02: Receive an electrical signal through the switch module in the battery protection circuit, and turn on or off the switch in the switch module according to the electrical signal, so that the first battery and the second battery are in a parallel connection state or a disconnected state.

[0075] See also Figure 5 This embodiment further provides a battery protection device 20. The battery protection device 20 includes an acquisition module 21 and a receiving module 22.

[0076] Step 01 can be implemented by the acquisition module 21, and step 02 can be implemented by the receiving module 22. That is, the acquisition module 21 is used to acquire the battery capacity and / or charging information of the first battery 210 and the second battery 230 in real time through the control chip 30 in the battery protection circuit 100, and output different electrical signals according to the battery capacity and / or charging information of the first battery 210 and the second battery 230. The receiving module 22 is used to receive the electrical signal through the switch module 10 in the battery protection circuit 100, and turn on or off the switch in the switch module 10 according to the electrical signal, so that the first battery 210 and the second battery 230 are in a parallel connection state or a disconnected state.

[0077] The charging information may include a fast charging stage and a constant voltage charging stage, as well as a voltage across the first battery 210 and a voltage across the second battery 230 .

[0078] The control chip 30 in the battery protection circuit 100 obtains the battery capacity and / or charging information of the first battery 210 and the second battery 230 in real time, and outputs different electrical signals according to the battery capacity and / or charging information of the first battery 210 and the second battery 230, including the following three situations:

[0079] (1) The control chip 30 in the battery protection circuit 100 obtains the battery capacities of the first battery 210 and the second battery 230 in real time, and outputs different electrical signals according to the battery capacities of the first battery 210 and the second battery 230.

[0080] (2) The control chip 30 in the battery protection circuit 100 obtains the charging information of the first battery 210 and the second battery 230 in real time, and outputs different electrical signals according to the charging information of the first battery 210 and the second battery 230.

[0081] (3) The control chip 30 in the battery protection circuit 100 obtains the battery capacity and charging information of the first battery 210 and the second battery 230 in real time, and outputs different electrical signals according to the battery capacity and charging information of the first battery 210 and the second battery 230.

[0082] For example, first, when the control chip 30 obtains in real time that the first battery 210 is in the fast charging stage and the second battery 230 is in the constant voltage charging stage, the control chip 30 outputs a low level signal. Then, the switch module 10 receives the low level signal and controls the switch in the switch module 10 to disconnect according to the low level signal, so that the first battery 210 and the second battery 230 are in a disconnected state.

[0083] For another example, first, when the control chip 30 obtains the voltage across the first battery 210 and the voltage across the second battery 230 in real time, the control chip 30 calculates that the voltage difference between the first battery 210 and the second battery 230 is less than the preset threshold value according to the voltage across the first battery 210 and the voltage across the second battery 230, and the control chip 30 outputs a high level signal. Then, the switch module 10 receives the high level signal, and controls the switch in the switch module 10 to turn on according to the high level signal, so that the first battery 210 and the second battery 230 are in a parallel connection state. Among them, the preset threshold value can be, for example, 400mV, 420mV, 440mV, 460mV, 480mV, 500mV, 520mV, 540mV, 560mV, 580mV and 600mV, which is not limited here.

[0084] In this way, the battery protection method of the present application can obtain the voltage across the first battery 210 and the voltage across the second battery 230 in real time through the control chip 30, and calculate the voltage difference between the first battery 210 and the second battery 230 based on the voltage across the first battery 210 and the voltage across the second battery 230. When the voltage difference is greater than or equal to a preset threshold, the first signal is output to control the switch in the switch module 10 to disconnect, so as to prevent the second battery 230 from over-discharging, thereby improving the stability and reliability of charging or discharging of the battery pack 200.

[0085] See also Figure 6 , this embodiment also provides a circuit system 1000. The circuit system 1000 includes the battery protection circuit 100, the battery pack 200, the charging chip 300 and the power consumption component 400 in the above embodiment. The battery pack 200 includes a first battery 210 and a second battery 230. The battery capacity of the first battery 210 is greater than the battery capacity of the second battery 230. The second battery 230 is connected in parallel with the first battery 210 through the battery protection circuit 100. The first end of the first battery 210 is connected to the first end of the battery protection circuit 100, and the second battery 230 is connected to the second end of the battery protection circuit 100. The second end of the first battery 210 is connected to the power consumption component 400 to supply power to the power consumption component 400. The second end of the first battery 210 is also connected to the charging chip 300 to charge the first battery 210 and the second battery 230 through the charging chip 300.

[0086] The charging chip 300 may include a fast charging chip and a normal charging chip. The power-consuming component 400 may refer to a power-consuming component in the terminal.

[0087] Specifically, when the battery pack 200 needs to be charged, the charging chip 300 charges the first battery 210 and the second battery 230 through the charging path A1. At this time, the control chip 30 in the battery protection circuit 100 obtains the charging information or battery capacity of the first battery 210 and the second battery 230 in real time, and outputs different electrical signals through the data channel A2 according to the charging information or battery capacity, so as to control the conduction or shutdown of the switch in the switch module 10 of the battery protection circuit 100 according to different electrical signals, so that the first battery 210 and the second battery 230 are in a conductive connection state or a disconnected state.

[0088] When the battery pack 200 supplies power to the power-consuming component 400, the first battery 210 and the second battery 230 supply power to the power-consuming component 400 through the discharge path A3. At this time, the control chip 30 in the battery protection circuit 100 obtains the battery capacity of the first battery 210 and the second battery 230 in real time, and outputs different electrical signals through the data channel A2 according to the battery capacity, so as to control the conduction or disconnection of the switch in the switch module 10 of the battery protection circuit 100 according to the different electrical signals, so that the first battery 210 and the second battery 230 are in a conductive connection state or a disconnected state.

[0089] In this way, the circuit system 1000 of the present application connects the first battery 210, the second battery 230 and the control chip 30 to the switch module 10 respectively. The control chip 30 obtains the battery capacity and charging information of the first battery 210 and the battery capacity and charging information of the second battery 230 in real time to output different electrical signals according to the battery capacity and the charging information. The switch module 10 controls the switch in the switch module 10 to be turned on or off according to the received electrical signal, so that the first battery 210 and the second battery 230 are in a parallel connection state or a disconnection state, thereby preventing the second battery 230 with a smaller battery capacity from being overcharged or over-discharged after the first battery 210 and the second battery 230 are connected in parallel, thereby improving the stability and reliability of charging or discharging of the battery pack 200.

[0090] This embodiment further provides a terminal. The terminal includes a processor, and the processor is used to implement the circuit system 1000 in the above embodiment. The terminal in this embodiment can be, for example, a mobile phone, a computer, an iPad, a car, or other electronic devices with a battery.

[0091] In this way, the terminal of the present application connects the first battery 210, the second battery 230 and the control chip 30 to the switch module 10 respectively. The control chip 30 obtains the battery capacity and charging information of the first battery 210 and the battery capacity and charging information of the second battery 230 in real time to output different electrical signals according to the battery capacity and charging information. The switch module 10 controls the switch in the switch module 10 to be turned on or off according to the received electrical signal, so that the first battery 210 and the second battery 230 are in a parallel connection state or a disconnection state, thereby preventing the second battery 230 with a smaller battery capacity from being overcharged or over-discharged after the first battery 210 and the second battery 230 are connected in parallel, thereby improving the stability and reliability of charging or discharging of the battery pack 200.

[0092] This embodiment also provides a computer-readable storage medium. The computer-readable storage medium also includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the battery protection method in the above embodiment is implemented.

[0093] For example, when the computer program is executed by the processor, the following steps of the battery charging method are implemented:

[0094] 01: The battery capacity and / or charging information of the first battery and the second battery are obtained in real time through the control chip in the battery protection circuit, and different electrical signals are output according to the battery capacity and / or charging information of the first battery and the second battery.

[0095] 02: The electrical signal is received through the switch module in the battery protection circuit, and the switch in the switch module is turned on or off according to the electrical signal, so that the first battery and the second battery are in a parallel connection state or a disconnected state.

[0096] It is understood that a computer program includes computer program code. The computer program code may be in source code form, object code form, executable file or some intermediate form. Computer readable storage media may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution medium.

[0097] In this way, the computer-readable storage medium of the present application connects the first battery 210, the second battery 230 and the control chip 30 to the switch module 10 respectively, and the control chip 30 obtains the battery capacity and charging information of the first battery 210 and the battery capacity and charging information of the second battery 230 in real time to output different electrical signals according to the battery capacity and the charging information, and the switch module 10 controls the switch in the switch module 10 to be turned on or off according to the received electrical signal, so that the first battery 210 and the second battery 230 are in a parallel connection state or a disconnection state, thereby preventing the second battery 230 with a smaller battery capacity from being overcharged or over-discharged after the first battery 210 and the second battery 230 are connected in parallel, thereby improving the stability and reliability of charging or discharging of the battery pack 200.

Claims

1. A battery protection circuit for a battery pack, characterized in that: The battery pack includes a first battery and a second battery, wherein the battery capacity of the first battery is greater than the battery capacity of the second battery; The battery protection circuit comprises a switch module and a control chip, wherein a first end of the switch module is connected to a first end of the control chip, a second end of the switch module is connected to a first end of the first battery, and a third end of the switch module is connected to a second battery; a second end of the control chip is connected to both the first battery and the second battery; The control chip is used to obtain the battery capacity and / or charging information of the first battery and the second battery in real time, and output different electrical signals according to the battery capacity and / or charging information of the first battery and the second battery; The switch module is used to receive the electrical signal and turn on or off the switch in the switch module according to the electrical signal, so that the first battery and the second battery are in a parallel connection state or a disconnection state.

2. The battery protection circuit according to claim 1, characterized in that: The charging information includes a voltage across the first battery and a voltage across the second battery, and the control chip is further used for: The voltage difference between the first battery and the second battery is calculated according to the voltage at both ends of the first battery and the voltage at both ends of the second battery, and a first signal is output when the voltage difference is greater than or equal to a preset threshold value to control the switch in the switch module to disconnect.

3. The battery protection circuit according to claim 2, characterized in that: The control chip is also used to output a second signal when the voltage difference is less than a preset threshold value to control the switch in the switch module to be turned on.

4. The battery protection circuit according to claim 1, characterized in that: The charging information also includes the charging stage of the first battery and the charging stage of the second battery, and the control chip is further used for: The first signal is outputted at different times during the charging stage of the first battery and the charging stage of the second battery to control the switch in the switch module to be disconnected.

5. The battery protection circuit according to claim 4, characterized in that: The control chip is also used to output a second signal when the charging stage of the first battery and the charging stage of the second battery are the same, so as to control the switch in the switch module to be turned on.

6. The battery protection circuit according to claim 1, characterized in that: The control chip is also used to output a first signal when it is detected that the battery capacity of the second battery reaches the rated battery capacity during the charging process, so as to control the switch in the switch module to be disconnected.

7. The battery protection circuit according to claim 1, characterized in that: The control chip is also used to output a first signal to control the switch in the switch module to be disconnected when it is detected that the discharge capacity of the second battery is less than the rated battery capacity during the discharge process.

8. The battery protection circuit according to claim 1, characterized in that: The battery protection circuit further includes an abnormality detection module, an input end of the abnormality detection module is connected to both the first battery and the second battery, and an output end of the abnormality detection module is connected to the first end of the switch module; The abnormality detection module is used to detect whether an abnormality occurs in the battery in the battery pack, and output a third signal when an abnormality is detected in the battery in the battery pack to control the switch in the switch module to disconnect.

9. The battery protection circuit according to claim 1, characterized in that: The switch module includes a first switch, a second switch and a third switch, the first switch is connected to the control chip, a first end of the second switch is connected to the first switch, and a second end of the second switch is connected to the first battery; a first end of the third switch is connected to the first switch, and a third end of the third switch is connected to the second battery.

10. The battery protection circuit according to claim 9, characterized in that: The battery protection circuit further includes a balancing resistor connected in parallel between the first battery and the second battery, and the balancing resistor is used to balance the voltages of the first battery and the second battery when the switch in the switch module is disconnected.

11. A battery protection method, using the battery protection circuit according to any one of claims 1 to 10, characterized in that: The battery protection method is used for a battery pack, the battery pack includes a first battery and a second battery, the battery capacity of the first battery is greater than the battery capacity of the second battery; The battery protection method comprises: acquiring the battery capacity and / or charging information of the first battery and the second battery in real time through the control chip in the battery protection circuit, and outputting different electrical signals according to the battery capacity and / or charging information of the first battery and the second battery; The electrical signal is received by a switch module in the battery protection circuit, and a switch in the switch module is turned on or off according to the electrical signal, so that the first battery and the second battery are in a parallel connection state or a disconnection state.

12. A circuit system, characterized in that: The circuit system comprises the battery protection circuit, battery pack, charging chip and power-consuming components according to any one of claims 1 to 10, the battery pack comprises a first battery and a second battery, the battery capacity of the first battery is greater than the battery capacity of the second battery; The second battery is connected in parallel with the first battery through the battery protection circuit; the first end of the first battery is connected to the first end of the battery protection circuit, and the second battery is connected to the second end of the battery protection circuit; The second end of the first battery is connected to the power consumption component to supply power to the power consumption component; The second end of the first battery is also connected to the charging chip so as to charge the first battery and the second battery through the charging chip.

13. A terminal, characterized in that: The terminal comprises the battery protection circuit according to any one of claims 1 to 10 or the circuit system according to claim 12.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium also includes a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the battery protection method of claim 11 is implemented.

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