Battery protection circuit and control method thereof, battery and electronic equipment

Abstract

The invention relates to a battery protection circuit and a control method thereof, a battery and electronic equipment, and the battery protection circuit comprises a voltameter, a first end of the voltameter is used for being coupled with a battery core of the battery; the first end of the first protection circuit is used for being coupled with the battery cell, the second end of the first protection circuit is coupled with the second end of the voltameter, and the first protection circuit is used for controlling whether the voltameter is closed or not according to the voltage of the battery cell; the first end of the first switch unit is used for being coupled with the battery cell, the second end of the first switch unit is used for being coupled with the load, the third end of the first switch unit is coupled with the third end of the voltameter, and the first switch unit is used for controlling connection and disconnection between the battery cell and the load; wherein the voltameter is used for controlling whether the first switch unit is switched off or not according to the voltage of the battery cell. The first protection circuit can control the voltameter to be closed, and the voltameter can control the first switch unit to disconnect the battery cell from the load, so that the risk of battery damage is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery protection, and in particular to a battery protection circuit and a control method thereof, a battery and an electronic device. Background Art

[0002] At present, with the development of electronic devices, the sales cycle of electronic devices is gradually extended, resulting in an increase in the storage time of electronic devices. During the storage process of electronic devices after being turned off, the power in the battery will gradually be consumed, resulting in the risk of battery damage. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a battery protection circuit and a control method thereof, a battery and an electronic device.

[0004] According to a first aspect of the present disclosure, a battery protection circuit is provided, the battery protection circuit comprising:

[0005] A fuel gauge, wherein a first end of the fuel gauge is used to couple with a battery cell of the battery;

[0006] a first protection circuit, wherein a first end of the first protection circuit is used to couple with the battery cell, a second end of the first protection circuit is coupled with a second end of the fuel gauge, and the first protection circuit is used to control whether the fuel gauge is turned off according to the voltage of the battery cell;

[0007] A first switch unit, wherein a first end of the first switch unit is used to couple with the battery cell, a second end of the first switch unit is used to couple with a load, a third end of the first switch unit is coupled with a third end of the fuel gauge, and the first switch unit is used to control the on / off between the battery cell and the load;

[0008] The power meter is used to control whether the first switch unit is disconnected according to the voltage of the battery cell.

[0009] In some embodiments of the present disclosure, the third end of the first protection circuit is used to couple with a charging device, and the first protection circuit is further used to control whether the fuel gauge is turned on according to the voltage of the battery cell when the charging device is connected.

[0010] In some embodiments of the present disclosure, the battery protection circuit further includes:

[0011] a second switch unit, wherein a first end of the second switch unit is used to couple with the battery cell, a second end of the second switch unit is coupled with a third end of the first protection circuit and is used to couple with a load, a third end of the second switch unit is coupled with a second end of the first protection circuit, and the second switch unit is used to control the on / off connection between the battery cell and the load;

[0012] The first protection circuit is further used to control the second switch unit to be turned on and off according to the voltage of the battery cell.

[0013] In some embodiments of the present disclosure, the first end of the fuel gauge is coupled to the second end of the first protection circuit, and the second end of the fuel gauge is used to couple to the battery cell; the battery protection circuit further includes:

[0014] a second protection circuit, wherein a first end of the second protection circuit is used to couple with the battery cell, a second end of the second protection circuit is coupled with a third end of the electricity meter, and a third end of the second protection circuit is coupled with a third end of the first switch unit;

[0015] The power meter is used to control whether the second protection circuit disconnects the first switch unit according to the voltage of the battery cell.

[0016] In some embodiments of the present disclosure, the fourth end of the second protection circuit is used to couple to a charging device, and the second protection circuit is used to control whether the first switch unit is turned on according to the voltage of the battery cell when the charging device is connected.

[0017] According to a second aspect of the present disclosure, a control method for the battery protection circuit as described above is provided, and the control method for the battery protection circuit includes:

[0018] When the voltage of the battery cell is less than a first preset voltage, the fuel gauge is turned off.

[0019] In some embodiments of the present disclosure, the control method of the battery protection circuit further includes:

[0020] When connected to a charging device, if the voltage of the battery cell is greater than or equal to the first preset voltage, the fuel gauge is turned on.

[0021] In some embodiments of the present disclosure, after turning on the fuel gauge, the control method of the battery protection circuit further includes:

[0022] The second switch unit is turned on.

[0023] In some embodiments of the present disclosure, the operation mode of the first protection circuit includes a first mode and a second mode, and the power consumption of the second mode is less than the power consumption of the first mode; when the voltage of the battery cell is less than the first preset voltage, the control method of the battery protection circuit further includes:

[0024] Disconnecting the second switch unit;

[0025] controlling the first protection circuit to operate in the second mode;

[0026] When the voltage of the battery cell is greater than or equal to the first preset voltage, the control method of the battery protection circuit further includes:

[0027] The first protection circuit is controlled to operate in the first mode.

[0028] In some embodiments of the present disclosure, the control method of the battery protection circuit further includes:

[0029] When the voltage of the battery cell is less than the second preset voltage and the duration reaches a preset time, the second protection circuit is controlled to disconnect the first switch unit.

[0030] In some embodiments of the present disclosure, controlling the second protection circuit to disconnect the first switch unit includes:

[0031] A pulse signal is sent to the second protection circuit.

[0032] In some embodiments of the present disclosure, the control method of the battery protection circuit further includes:

[0033] When connected to a charging device, if the voltage of the battery cell is greater than or equal to a third preset voltage, turning on the first switch unit;

[0034] The first preset voltage is smaller than the third preset voltage, and the third preset voltage is smaller than the second preset voltage.

[0035] In some embodiments of the present disclosure, the operation mode of the second protection circuit includes a third mode and a fourth mode, and the power consumption of the fourth mode is less than the power consumption of the third mode; the control method of the battery protection circuit further includes:

[0036] When the voltage of the battery cell is less than the third preset voltage, controlling the second protection circuit to operate in the fourth mode;

[0037] When the voltage of the battery cell is greater than or equal to the third preset voltage, the second protection circuit is controlled to operate in the third mode.

[0038] According to a third aspect of the present disclosure, a battery is provided, comprising the battery protection circuit as described above.

[0039] According to a fourth aspect of the present disclosure, an electronic device is provided, comprising the battery as described above.

[0040] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0041] The battery protection circuit includes a fuel meter, a first protection circuit and a first switch unit, and the fuel meter is coupled to the first protection circuit and the first switch unit. The first protection circuit can control whether the fuel meter is turned off according to the voltage of the battery cell in the battery to avoid the fuel meter from consuming power. The fuel meter can control whether the first switch unit is disconnected according to the voltage of the battery cell to avoid the battery cell from supplying power to the load. Since the first protection circuit can control the fuel meter to turn off and the fuel meter can control the first switch unit to disconnect the battery cell from the load, the power consumption of the battery protection circuit and the load is reduced to extend the storage time of the battery after the electronic device is shut down, thereby reducing the risk of battery damage.

[0042] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0044] Figure 1 It is a schematic diagram of the connection between a battery and a load;

[0045] Figure 2 is a structural schematic diagram of a battery protection circuit provided by an exemplary embodiment of the present disclosure;

[0046] Figure 3 is a structural schematic diagram of a battery protection circuit provided by another exemplary embodiment of the present disclosure;

[0047] Figure 4 is a structural schematic diagram of a battery protection circuit provided by another exemplary embodiment of the present disclosure;

[0048] Figure 5 is a structural schematic diagram of a battery protection circuit provided by another exemplary embodiment of the present disclosure;

[0049] Figure 6 is a flow chart of a control method of a battery protection circuit provided by an exemplary embodiment of the present disclosure;

[0050] Figure 7 is a flow chart of a control method of a battery protection circuit provided by another exemplary embodiment of the present disclosure;

[0051] Figure 8 is a system block diagram of an electronic device provided by an exemplary embodiment of the present disclosure.

[0052] In the figure:

[0053] 1-battery; 2-first load; 3-second load; 4-switch; 5-control circuit; 10-electricity meter; 20-first protection circuit; 30-first switch unit; 40-load; 50-second switch unit; 60-second protection circuit; cell-battery core; T1-first transistor; T2-second transistor; T3-third transistor; T4-fourth transistor; VD1-first diode; VD2-second diode; VD3-third diode; VD4-fourth diode; R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-sixth resistor; R7-seventh resistor; R8-eighth resistor; R9-ninth resistor; R10-tenth resistor; R11-eleventh resistor; R12-twelfth resistor; R13-thirteenth resistor; R14-fourteenth resistor; C1-first capacitor; C2-second capacitor; C3- Three capacitors; C4-the fourth capacitor; C5-the fifth capacitor; C6-the sixth capacitor; C7-the seventh capacitor; ZD1-the first voltage regulator; ZD2-the second voltage regulator; GND-the ground terminal; VDD-the power supply terminal; VSS-the common terminal; CTL-the discharge control terminal; INT-the interrupt terminal; DO-the discharge output terminal; CO-the charging output terminal; VM-the voltage detection terminal; VINI-the current detection terminal; BAT_SNS-the power supply sensing terminal; SRP-the first current detection terminal; SRN-the second current detection terminal; SDA-the data transmission terminal; SCL-the clock transmission terminal; TS-the temperature detection terminal; CE-the enable terminal; BAT-the battery terminal; 400-the electronic device; 402-the processing component; 404-the memory; 406-the power supply component; 408-the multimedia component; 410-the audio component; 412-the input and output interface; 414-the sensor component; 416-the communication component; 420-the processor. DETAILED DESCRIPTION

[0054] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items. In addition, the term "coupled" should be understood in a broad sense and can be a direct or physical connection, or an indirect or electrical connection.

[0055] At present, with the development of electronic devices, the sales cycle of electronic devices is gradually extended, which increases the storage time of electronic devices. In addition, after purchasing electronic devices, users may use the electronic devices as spare devices and not use them frequently, and the spare electronic devices are stored in a shutdown state for a long time. Especially when users are on business trips, the storage time of spare electronic devices will increase. In the process of storing electronic devices after being shut down, the load coupled to the battery has a certain power consumption, and the protection circuit and battery cells inside the battery have a certain power consumption.

[0056] In the related art, a method for connecting a battery and a load is provided to reduce the power consumption of an electronic device after it is turned off. Figure 1 As shown, the electronic device circuit includes a battery 1, a first load 2, a second load 3, a switch 4 and a control circuit 5. The first load 2 is coupled to the battery 1. The second load 3 is coupled to the battery 1 through the switch 4. The control circuit 5 is coupled to the switch 4. When the electronic device is turned off, the control circuit 5 controls the switch 4 to be disconnected to eliminate the power consumption generated by the second load 3. However, the circuits and cells inside the battery 1, the first load 2 and the control circuit 5 still have a certain amount of power consumption. As the storage time of the electronic device increases, the battery 1 may be over-discharged and cause problems such as bulging, which puts the battery 1 at risk of damage.

[0057] Based on this, the present disclosure provides a battery protection circuit, wherein the first protection circuit of the battery protection circuit can control the fuel gauge to be turned off according to the voltage of the battery cell in the battery. Since the power consumption of the circuit inside the battery is reduced after the fuel gauge is turned off, the possibility of over-discharging the battery is reduced, thereby reducing the risk of battery damage.

[0058] like Figure 2 As shown, an exemplary embodiment of the present disclosure provides a battery protection circuit, including a fuel meter 10, a first protection circuit 20 and a first switch unit 30. The first end of the fuel meter 10 is used to couple with a battery cell of a battery. The first end of the first protection circuit 20 is used to couple with the battery cell, and the second end is coupled to the second end of the fuel meter 10, and is used to control whether the fuel meter 10 is turned off according to the voltage of the battery cell. The first end of the first switch unit 30 is used to couple with the battery cell, the second end is used to couple with the load 40, and the third end is coupled to the third end of the fuel meter 10, and is used to control the on-off between the battery cell and the load 40. Among them, the fuel meter 10 is used to control whether the first switch unit 30 is disconnected according to the voltage of the battery cell.

[0059] In this embodiment, the battery protection circuit includes a fuel meter, a first protection circuit and a first switch unit, and the fuel meter is coupled to the first protection circuit and the first switch unit. The first protection circuit can control whether the fuel meter is turned off according to the voltage of the battery cell in the battery to avoid the fuel meter from generating power consumption. The fuel meter can control whether the first switch unit is disconnected according to the voltage of the battery cell to avoid the battery cell from supplying power to the load. Since the first protection circuit can control the fuel meter to turn off and the fuel meter can control the first switch unit to disconnect the battery cell from the load, the power consumption of the battery protection circuit and the load is reduced to extend the storage time of the battery after the electronic device is shut down, thereby reducing the risk of battery damage.

[0060] For example, Figure 3 As shown, the first end of the fuel gauge 10 may be an enable end CE of the fuel gauge 10, the second end may be a power supply sensing end BAT_SNS of the fuel gauge 10, and the third end may be an interrupt end INT of the fuel gauge 10. The first end of the first protection circuit 20 may be a power supply end VDD of the first protection circuit 20, and the second end may be a discharge output end DO of the first protection circuit 20. The power supply end VDD of the first protection circuit 20 is coupled to the positive electrode of the battery cell. The third end of the fuel gauge 10 may be directly coupled to the first switch unit 30, or may be indirectly coupled to the first switch unit 30.

[0061] In one embodiment, the third terminal of the first protection circuit 20 is used to couple with a charging device. The first protection circuit 20 is also used to control whether the fuel gauge 10 is turned on according to the voltage of the battery cell when the charging device is connected.

[0062] In this embodiment, when the charging device is connected, the charging device will charge the battery cells. Since the fuel gauge of the battery protection circuit can detect the charging information of the battery cells during the charging process, the fuel gauge needs to be turned on to detect the charging information. When the voltage of the battery cell is low, the fuel gauge may not operate normally, and it is necessary to determine whether to control the fuel gauge to be turned on according to the voltage of the battery cell to avoid the fuel gauge from operating unstably and affecting the charging process of the battery cell. By controlling whether the fuel gauge is turned on according to the voltage of the battery cell after connecting to the charging device, the charging process of the battery cell is avoided from being affected, thereby improving the reliability of the battery protection circuit.

[0063] It can be understood that in addition to controlling whether the fuel meter 10 is turned on through the second end of the first protection circuit 20, the fuel meter 10 can also be coupled to a wake-up circuit composed of transistors and / or resistors, and the wake-up circuit controls whether the fuel meter 10 is turned on according to the voltage of the battery cell.

[0064] Exemplarily, the third terminal of the first protection circuit 20 may be a voltage detection terminal VM of the first protection circuit 20 .

[0065] In one embodiment, if Figure 4As shown, the battery protection circuit also includes a second switch unit 50. The first end of the second switch unit 50 is used to couple with the battery cell, the second end is coupled to the third end of the first protection circuit 20 and is used to couple with the load 40, and the third end is coupled to the second end of the first protection circuit 20, and is used to control the on and off between the battery cell and the load 40. Among them, the first protection circuit 20 is also used to control the second switch unit 50 to be turned on and off according to the voltage of the battery cell. The first switch unit 30 can be coupled between the second switch unit 50 and the load 40, and the second switch unit 50 can be coupled between the battery cell and the first switch unit 30.

[0066] In this embodiment, the on-off between the battery cell and the load can be controlled by the second switch unit so that the battery cell supplies power to the load or stops supplying power. Since the second switch unit is turned on and off according to the voltage of the battery cell, the battery cell and the load can be disconnected when the battery cell voltage is low to reduce problems such as bulging caused by over-discharge of the battery cell, thereby reducing the risk of battery damage. At the same time, since the fuel gauge and the second switch unit reuse the second end of the first protection circuit, the use of the first protection circuit pins and the number of components in the battery protection circuit are reduced, thereby reducing the complexity of the battery protection circuit structure. Since the second switch unit and the first switch unit can both control the on-off between the battery cell and the load, and the voltage of the battery cell on which the first protection circuit and the fuel gauge control the disconnection of the second switch unit and the first switch unit is different, one of the first switch unit and the second switch unit is used as a backup to improve the reliability of the battery protection circuit.

[0067] Exemplarily, the load 40 includes a main control circuit. The charging device is coupled to the third terminal of the first protection circuit 20 via the main control circuit.

[0068] In one embodiment, if Figure 4 As shown, the battery protection circuit further includes a second protection circuit 60. A first end of the second protection circuit 60 is used to couple with the battery cell, a second end is coupled with a third end of the fuel gauge 10, and a third end is coupled with a third end of the first switch unit 30. The fuel gauge 10 is used to control whether the second protection circuit 60 disconnects the first switch unit 30 according to the voltage of the battery cell. The battery cell is coupled to the load 40.

[0069] In this embodiment, since the fuel gauge controls the first switch unit to be disconnected through the second protection circuit according to the voltage of the battery cell, the load can be powered off when the battery cell voltage is low to reduce problems such as bulging caused by over-discharge of the battery cell, thereby reducing the risk of battery damage.

[0070] For example, Figure 3As shown, the first end of the second protection circuit 60 may be the power supply end VDD of the second protection circuit 60 , the second end may be the control discharge end CTL of the second protection circuit 60 , and the third end may be the discharge output end DO of the second protection circuit 60 .

[0071] In one embodiment, the fourth terminal of the second protection circuit 60 is used to couple with a charging device, and is used to control whether the first switch unit 30 is turned on according to the voltage of the battery cell when the charging device is connected.

[0072] In this embodiment, when the charging device is connected, the charging device will charge the battery cells. Since the first switch unit can enable the battery cells to supply power to the load, it is necessary to control whether the first switch unit is turned on according to the voltage of the battery cells to reduce problems such as bulging caused by over-discharging of the battery cells, thereby reducing the risk of battery damage.

[0073] Exemplarily, the fourth terminal of the second protection circuit 60 may be a voltage detection terminal VM of the second protection circuit 60 . The charging device is coupled to the voltage detection terminal VM of the second protection circuit 60 through the main control circuit in the load 40 .

[0074] Exemplarily, the first switch unit 30 includes a first transistor T1 and a second transistor T2, and the second switch unit 50 includes a third transistor T3 and a fourth transistor T4. The first end of the first transistor T1 is coupled to the first end of the fourth transistor T4 and the voltage detection end VM of the first protection circuit 20, and the control end is coupled to the discharge output end DO of the second protection circuit 60. The first end of the second transistor T2 is coupled to the voltage detection end VM of the second protection circuit 60 and is used to couple with the load 40, the second end is coupled to the second end of the first transistor T1, and the control end is coupled to the charging output end CO of the second protection circuit 60. The first end of the third transistor T3 is coupled to the negative electrode of the battery cell and the ground end GND, and the control end is coupled to the discharge output end DO of the first protection circuit 20. The second end of the fourth transistor T4 is coupled to the second end of the third transistor T3, and the control end is coupled to the charging output end CO of the first protection circuit 20.

[0075] Exemplarily, the first switch unit 30 further includes a first diode VD1 and a second diode VD2, and the second switch unit 50 further includes a third diode VD3 and a fourth diode VD4. The anode of the first diode VD1 is coupled to the first end of the first transistor T1, and the cathode is coupled to the second end of the first transistor T1. The first diode VD1 may be a body diode of the first transistor T1. The anode of the second diode VD2 is coupled to the first end of the second transistor T2, and the cathode is coupled to the second end of the second transistor T2. The second diode VD2 may be a body diode of the second transistor T2. The anode of the third diode VD3 is coupled to the first end of the third transistor T3, and the cathode is coupled to the second end of the third transistor T3. The third diode VD3 may be a body diode of the third transistor T3. The anode of the fourth diode VD4 is coupled to the first end of the fourth transistor T4, and the cathode is coupled to the second end of the fourth transistor T4. The fourth diode VD4 may be a body diode of the fourth transistor T4. When the charging device is connected, the charging current flows through the cell, the third diode VD3, the fourth transistor T4, the first diode VD1, and the second transistor T2.

[0076] Exemplarily, the first protection circuit 20 controls the second switch unit 50 to be turned on and off, that is, controls the third transistor T3 in the second switch unit 50 to be turned on and off. The second protection circuit 60 controls the first switch unit 30 to be turned on and off, that is, controls the first transistor T1 in the first switch unit 30 to be turned on and off.

[0077] For example, Figure 3 and Figure 5 As shown, when the first protection circuit 20 detects that the voltage of the battery cell is low, the discharge output terminal DO of the first protection circuit 20 outputs a low level to the enable terminal CE of the fuel gauge 10 to control the fuel gauge 10 to be turned off, and at the same time controls the third transistor T3 to be turned off. When the charging device is connected, when the first protection circuit 20 detects that the voltage of the battery cell is high, the discharge output terminal DO of the first protection circuit 20 outputs a high level to the enable terminal CE of the fuel gauge 10 to control the fuel gauge 10 to be turned on, and at the same time controls the third transistor T3 to be turned on.

[0078] Exemplarily, when the fuel gauge 10 detects that the voltage of the battery cell is low, the fuel gauge 10 sends a pulse signal to the control discharge terminal CTL of the second protection circuit 60 through the interrupt terminal INT, so as to control the first transistor T1 to be turned off through the second protection circuit 60. After the control discharge terminal CTL of the second protection circuit 60 receives the pulse signal, it is determined that the duration of the pulse signal at a high level reaches the first delay time Td1, and then after the second delay time Td2, the discharge output terminal DO of the second protection circuit 60 is controlled to output a low level to turn off the first transistor T1. At this time, since the first transistor T1 is turned off, the voltage of the voltage detection terminal VM of the second protection circuit 60 changes. Since the control discharge terminal CTL of the second protection circuit 60 controls the discharge output terminal DO of the second protection circuit 60 to output a low level, the second protection circuit 60 is in a latched state, and the first transistor T1 can be turned on only when the charging device is connected. When the charging device is connected, the voltage of the voltage detection terminal VM of the second protection circuit 60 will be lower than the voltage of the ground terminal GND. When the voltage at the voltage detection terminal VM of the second protection circuit 60 is less than the voltage at the ground terminal GND for a third delay time Td3, the discharge output terminal DO of the second protection circuit 60 outputs a high level to turn on the first transistor T1. DO is the voltage of the discharge output terminal DO of the second protection circuit 60, V VM is the voltage of the voltage detection terminal VM of the second protection circuit 60, V CTL is the voltage of the control discharge terminal CTL of the second protection circuit 60, t0, t1, t2, t3 and t4 represent different moments. The value range of the first delay time Td1, the second delay time Td2 and the third delay time Td3 is 1ms to 1000ms, which can be 10ms, 32ms, 64ms, 128ms, etc.

[0079] In one embodiment, the battery protection circuit further includes a first resistor R1. The first end of the first resistor R1 is used to couple to the negative electrode of the battery cell and the ground terminal GND, and the second end is coupled to the first end of the third transistor T3. The voltage at the second end of the first resistor R1 is used to reflect the charge and discharge current of the battery cell. Among them, the fourth end of the fuel gauge 10, the fourth end of the first protection circuit 20, and the fifth end of the second protection circuit 60 are all coupled to the second end of the first resistor R1. The first resistor R1 can be a precision resistor (Rsense).

[0080] In this embodiment, the first resistor is coupled between the battery cell and the load to reflect the charge and discharge current of the battery cell. The fuel gauge, the first protection circuit and the second protection circuit are coupled to the first resistor to detect the charge and discharge current of the battery cell to control the on and off of the first switch unit and the second switch unit to improve the reliability of the battery protection circuit.

[0081] Exemplarily, the fourth terminal of the fuel meter 10 may be the first current detection terminal SRN of the fuel meter 10. The fourth terminal of the first protection circuit 20 may be the current detection terminal VINI of the first protection circuit 20. The fifth terminal of the second protection circuit 60 may be the current detection terminal VINI of the second protection circuit 60.

[0082] Exemplarily, the battery protection circuit further includes a second resistor R2, a third resistor R3 and a first capacitor C1. The second resistor R2 is coupled between the voltage detection terminal VM of the first protection circuit 20 and the first end of the fourth transistor T4. The third resistor R3 is coupled between the power supply terminal VDD of the first protection circuit 20 and the positive electrode of the battery cell. The first capacitor C1 is coupled between the power supply terminal VDD and the ground terminal GND of the first protection circuit 20. The common terminal VSS of the first protection circuit 20 is coupled to the ground terminal GND.

[0083] Exemplarily, the battery protection circuit further includes a fourth resistor R4, a fifth resistor R5 and a second capacitor C2. The fourth resistor R4 is coupled between the voltage detection terminal VM of the second protection circuit 60 and the first end of the second transistor T2. The fifth resistor R5 is coupled between the power supply terminal VDD of the second protection circuit 60 and the positive electrode of the battery cell. The second capacitor C2 is coupled between the power supply terminal VDD and the ground terminal GND of the second protection circuit 60. The common terminal VSS of the second protection circuit 60 is coupled to the ground terminal GND.

[0084] Exemplarily, the battery protection circuit further includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a first voltage regulator ZD1 and a second voltage regulator ZD2. The sixth resistor R6 is coupled between the discharge output terminal DO of the first protection circuit 20 and the enable terminal CE of the fuel gauge 10. The seventh resistor R7 is coupled between the positive electrode of the battery cell and the battery terminal BAT of the fuel gauge 10. The eighth resistor R8 is coupled between the first current detection terminal SRN of the fuel gauge 10 and the second end of the first resistor R1. The ninth resistor R9 is coupled between the second current detection terminal SRP of the fuel gauge 10 and the ground terminal GND. The tenth resistor R10 is coupled between the interrupt terminal INT of the fuel gauge 10 and the control discharge terminal CTL of the second protection circuit 60. The eleventh resistor R11 is coupled between the data transmission terminal SDA of the fuel meter 10 and the load 40. The twelfth resistor R12 is coupled between the clock transmission terminal SCL of the fuel meter 10 and the load 40. The thirteenth resistor R13 is coupled between the power supply sensing terminal BAT_SNS of the fuel meter 10 and the positive electrode of the battery cell. The fourteenth resistor R14 is coupled between the temperature detection terminal TS and the ground terminal GND of the fuel meter 10. The third capacitor C3 is coupled between the enable terminal CE and the ground terminal GND of the fuel meter 10. The fourth capacitor C4 is coupled between the first current detection terminal SRN and the second current detection terminal SRP of the fuel meter 10. The fifth capacitor C5 is coupled between the battery terminal BAT and the ground terminal GND of the fuel meter 10. The sixth capacitor C6 is coupled between the power supply sensing terminal BAT_SNS and the ground terminal GND of the fuel meter 10. The seventh capacitor C7 is coupled between the control discharge terminal CTL and the ground terminal GND of the second protection circuit 60. The cathode of the first voltage regulator ZD1 is coupled between the data transmission terminal SDA of the fuel gauge 10 and the load 40, and the anode is coupled to the first end of the second transistor T2. The cathode of the second voltage regulator ZD2 is coupled between the clock transmission terminal SCL of the fuel gauge 10 and the load 40, and the anode is coupled to the first end of the second transistor T2. The common terminal VSS of the fuel gauge 10 is coupled to the ground terminal GND.

[0085] An exemplary embodiment of the present disclosure further provides a control method for a battery protection circuit. The control method can be applied to the above circuit structure, for example. The control method for the battery protection circuit includes:

[0086] When the voltage of the battery cell is less than the first preset voltage, the fuel gauge is turned off.

[0087] In this embodiment, when the voltage of the battery cell is less than the first preset voltage, the voltage of the battery cell is low, and there may be an over-discharge problem. When the voltage of the battery cell is less than the first preset voltage, the fuel gauge is turned off to reduce the power consumption of the battery protection circuit, thereby reducing the risk of battery damage.

[0088] Exemplarily, the value range of the first preset voltage may be 2V to 3.5V. The value of the first preset voltage may be 2.1V, 2.2V, 2.3V, 2.4V, etc.

[0089] In one embodiment, the control method of the battery protection circuit further includes:

[0090] When connected to a charging device, if the voltage of the battery cell is greater than or equal to a first preset voltage, the fuel gauge is turned on.

[0091] In this embodiment, when the charging device is connected, the charging device will charge the battery cell. Since the fuel gauge is turned off when the voltage of the battery cell is less than the first preset voltage, if the fuel gauge is turned on after the charging device is connected, the fuel gauge may not operate normally and may damage the battery cell. When the charging device charges the voltage of the battery cell to above the first preset voltage, the fuel gauge is turned on to avoid affecting the use of the battery cell and the fuel gauge, thereby improving the reliability of the battery protection circuit.

[0092] In one embodiment, after the fuel gauge is turned on, the control method of the battery protection circuit further includes:

[0093] The second switch unit is turned on.

[0094] In this embodiment, when the charging device is connected, the charging device will charge the battery cell. Since the second switch unit is closed when the voltage of the battery cell is less than the first preset voltage, if the second switch unit is turned on after the charging device is connected, the second switch unit will generate a certain amount of power consumption and the load cannot be operated when the voltage of the battery cell is within the first preset voltage. When the charging device charges the voltage of the battery cell to above the first preset voltage, the second switch unit is turned on, which reduces the power consumption of the second switch unit and does not affect the function of the electronic device, thereby improving the reliability of the battery protection circuit. At the same time, by turning on the second switch unit, the power consumption generated by the conduction of the diode in the second switch unit is avoided, thereby reducing the power consumption of the battery protection circuit.

[0095] Exemplarily, turning on the second switch unit in the above step is turning on the third transistor in the second switch unit.

[0096] In one embodiment, the operation mode of the first protection circuit includes a first mode and a second mode, and the power consumption of the second mode is less than the power consumption of the first mode. When the voltage of the battery cell is less than the first preset voltage, the control method of the battery protection circuit further includes:

[0097] The second switch unit is turned off.

[0098] The first protection circuit is controlled to operate in a second mode.

[0099] In this embodiment, the operation mode of the first protection circuit includes a first mode and a second mode. In the first mode, the power consumption is high due to the need for overcharge, overdischarge and overcurrent protection. In the second mode, the battery cell is in a low power consumption state because it has been overdischarged. When the voltage of the battery cell is less than the first preset voltage, the second switch unit is disconnected to reduce the power consumption generated by the second switch unit. By controlling the first protection circuit to operate in the second mode, the power consumption of the battery protection circuit is reduced, thereby reducing the risk of battery damage.

[0100] Exemplarily, disconnecting the second switch unit in the above step is disconnecting the third transistor in the second switch unit. The first mode of the first protection circuit may be a working mode, capable of overcharging, overdischarging and overcurrent protection of the battery cell. The second mode of the first protection circuit may be a low power mode or a sleep mode, etc., in which the first protection circuit partially operates or completely stops operating.

[0101] In one embodiment, the control method of the battery protection circuit further includes:

[0102] When the voltage of the battery cell is greater than or equal to the first preset voltage, the first protection circuit is controlled to operate in the first mode.

[0103] In this embodiment, when the voltage of the battery cell is greater than or equal to the first preset voltage, the first protection circuit is required to protect the battery cell, and the first protection circuit is controlled to operate in the first mode. By controlling the first protection circuit to protect the battery cell when the voltage of the battery cell is greater than or equal to the first preset voltage, the battery cell is prevented from being damaged during the charging and discharging process, thereby reducing the risk of battery damage.

[0104] In one embodiment, the control method of the battery protection circuit further includes:

[0105] When the voltage of the battery cell is less than the second preset voltage and the duration reaches a preset time, the second protection circuit is controlled to disconnect the first switch unit.

[0106] In this embodiment, when the voltage of the battery cell is less than the second preset voltage and the duration reaches a preset time, the electronic device is in a shutdown state and the shutdown lasts for a certain time. The second protection circuit is controlled to disconnect the first switch unit, disconnect the battery cell from the load to avoid energy consumption by the load, thereby reducing the risk of battery damage. In addition, according to the size of the first preset voltage and the second preset voltage, one of the first switch unit and the second switch unit is used as a backup, thereby improving the reliability of the battery protection circuit.

[0107] Exemplarily, disconnecting the first switch unit in the above step is disconnecting the first transistor in the first switch unit.

[0108] Exemplarily, the value range of the second preset voltage may be 2V to 3.5V. The value of the second preset voltage may be 3V, 3.1V, 3.2V, 3.3V, etc. The second preset voltage may be determined according to the shutdown voltage of the electronic device, and the threshold voltage is subtracted from the shutdown voltage as the second preset voltage. The value of the preset time is a positive number, which may be 5h, 24h, 48h, etc.

[0109] In one embodiment, the step of controlling the second protection circuit to disconnect the first switch unit in the above step includes:

[0110] A pulse signal is sent to the second protection circuit.

[0111] In this embodiment, a pulse signal is sent to the second protection circuit so that the second protection circuit disconnects the first switch unit, thereby reducing the complexity of controlling the battery protection circuit. At the same time, since the second protection circuit is in a latched state after disconnecting the first switch unit according to the pulse signal, the first switch unit can be turned on only when the unlocking condition is met, thereby improving the reliability of the battery protection circuit.

[0112] In one embodiment, the control method of the battery protection circuit further includes:

[0113] When connected to a charging device, if the voltage of the battery cell is greater than or equal to the third preset voltage, the first switch unit is turned on.

[0114] In this embodiment, when the charging device is connected, if the first switch unit is directly turned on, the battery cell may be over-discharged and damaged. When the voltage of the battery cell is greater than or equal to the third preset voltage, the first switch unit is turned on to enable the battery cell to supply power to the load, thereby improving the reliability of the battery protection circuit. At the same time, by turning on the first switch unit, the power consumption generated by the conduction of the diode in the first switch unit is avoided, thereby reducing the power consumption of the battery protection circuit.

[0115] Exemplarily, turning on the first switch unit in the above step is turning on the first transistor in the first switch unit.

[0116] Exemplarily, the value range of the third preset voltage may be 2V to 3.5V. The value of the third preset voltage may be 2.5V, 2.6V, 2.7V, etc.

[0117] In one embodiment, the first preset voltage is smaller than the third preset voltage, and the third preset voltage is smaller than the second preset voltage.

[0118] In this embodiment, since the first preset voltage is less than the third preset voltage and the third preset voltage is less than the second preset voltage, when the electronic device is turned off, the battery cell gradually stops providing power to the load, the second protection circuit, the power meter and the first protection circuit. When the voltage of the battery cell drops to the first preset voltage, the power consumption of the battery cell is only generated by its own leakage current, thereby reducing the risk of battery damage.

[0119] In one embodiment, the operation mode of the second protection circuit includes a third mode and a fourth mode, and the power consumption of the fourth mode is less than the power consumption of the third mode. The control method of the battery protection circuit also includes:

[0120] When the voltage of the battery cell is less than the third preset voltage, the second protection circuit is controlled to operate in a fourth mode.

[0121] When the voltage of the battery cell is greater than or equal to the third preset voltage, the second protection circuit is controlled to operate in the third mode.

[0122] In this embodiment, the operation mode of the second protection circuit includes a third mode and a fourth mode. In the third mode, the power consumption is high due to the need for overcharge, overdischarge and overcurrent protection. In the fourth mode, the battery cell is in a low power consumption state because it has been overdischarged. When the voltage of the battery cell is less than the third preset voltage, the second protection circuit is controlled to operate in the fourth mode to reduce the power consumption of the battery protection circuit, thereby reducing the risk of battery damage. When the voltage of the battery cell is greater than or equal to the third preset voltage, the second protection circuit is required to protect the battery cell, and the second protection circuit is controlled to operate in the third mode. By controlling the second protection circuit to protect the battery cell when the voltage of the battery cell is greater than or equal to the third preset voltage, the battery cell is prevented from being damaged during the charging and discharging process, thereby reducing the risk of battery damage.

[0123] In one embodiment, in combination Figure 6 As shown, the control method of the battery protection circuit includes:

[0124] S100: After the electronic device is turned off, the voltage of the battery cell is detected.

[0125] S150: When the voltage of the battery cell is less than the second preset voltage and the duration reaches a preset time, a pulse signal is sent to the second protection circuit to control the second protection circuit to disconnect the first switch unit.

[0126] S200: When the voltage of the battery cell is less than the third preset voltage, control the second protection circuit to operate in a fourth mode.

[0127] S250: When the voltage of the battery cell is less than the first preset voltage, turn off the fuel gauge.

[0128] S300, disconnect the second switch unit.

[0129] S350, controlling the first protection circuit to operate in the second mode.

[0130] In this embodiment, after the electronic device is turned off, the voltage of the battery cell is detected to determine whether the electronic device needs to be stored for a long time. When the voltage of the battery cell is less than the second preset voltage and the duration reaches the preset time, the electronic device reaches a certain time after being turned off, and the voltage of the battery cell drops to a certain extent, and the power consumption of the electronic device needs to be reduced. A pulse signal is sent to the second protection circuit to control the second protection circuit to disconnect the first switch unit, disconnect the battery cell from the load, and the battery does not supply power to the load, thereby reducing the power consumption of the electronic device. When the voltage of the battery cell is less than the third preset voltage, the battery cell reaches the voltage of the first over-discharge protection, and the second protection circuit is controlled to operate in the fourth mode to reduce the power consumption of the battery protection circuit. When the voltage of the battery cell is less than the first preset voltage, the battery cell reaches the voltage of the second over-discharge protection, the fuel meter is turned off and the second switch unit is disconnected to reduce the power consumption of the battery protection circuit. In addition, the first protection circuit is controlled to operate in the second mode to reduce the power consumption of the battery protection circuit. When the voltage of the battery cell is less than the first preset voltage, only the power consumption of the battery cell itself is consumed in the electronic device, thereby reducing the risk of battery damage.

[0131] In one embodiment, in combination Figure 7 As shown, the control method of the battery protection circuit includes:

[0132] S400: After connecting to the charging device, detect the voltage of the battery cell.

[0133] S450: When the voltage of the battery cell is greater than or equal to a first preset voltage, control the first protection circuit to operate in a first mode.

[0134] S500, turn on the power meter.

[0135] S550: Turn on the second switch unit.

[0136] S600: When the voltage of the battery cell is greater than or equal to a third preset voltage, control the second protection circuit to operate in a third mode.

[0137] S650: When the charging device is connected for a time longer than the third delay time, turn on the first switch unit.

[0138] In this embodiment, after the charging device is connected, the voltage of the battery cell is detected to determine whether the battery cell can be discharged. When the voltage of the battery cell is greater than or equal to the first preset voltage, the fuel gauge is turned on to detect the charging information. The second switch unit is turned on to reduce the loss of the battery cell during the charging process. The first protection circuit is controlled to operate in the first mode so that the first protection circuit protects the battery cell. When the voltage of the battery cell is greater than or equal to the third preset voltage, the second protection circuit is controlled to operate in the third mode so that the second protection circuit protects the battery cell. When the charging device is connected for a time greater than the third delay time, the latch state of the second protection circuit is released, and the first switch unit is controlled to be turned on to reduce the loss of the battery cell during the charging process and to supply power to the load. Since different control methods are adopted according to the voltage of the battery cell after the charging device is connected, the reliability of the battery protection circuit is improved.

[0139] For example, the battery capacity is 4000mAh, and the effect of the battery protection circuit and control method provided by the embodiment of the present disclosure is described. After the electronic device is turned off, the voltage of the battery cell drops to 3.2V and the first transistor is disconnected. After the voltage of the battery cell drops to 2.5V, the second protection circuit operates in the fourth mode. After the voltage of the battery cell drops to 2.3V, the third transistor is disconnected and the first protection circuit operates in the second mode. Compared with Figure 1 According to the circuit provided in the related technology, the time for the cell voltage to drop to 2.5V can be extended to more than 5 months, and the time for the cell voltage to drop to 2.1V can be extended to more than 7 months. Therefore, the storage time of the electronic device after being turned off is extended, and the possibility of battery bulging is reduced, thereby reducing the risk of damage to the electronic device.

[0140] An exemplary embodiment of the present disclosure further provides a battery, which includes a battery cell and the battery protection circuit as described above.

[0141] In an exemplary embodiment, an electronic device is provided, such as a mobile phone, a laptop computer, a tablet computer, a wearable device, etc. The electronic device includes the battery as described above.

[0142] refer to Figure 8 As shown, electronic device 400 may include one or more of the following components: a processing component 402 , a memory 404 , a power component 406 , a multimedia component 408 , an audio component 410 , an input / output (I / O) interface 412 , a sensor component 414 , and a communication component 416 .

[0143] The processing component 402 generally controls the overall operation of the electronic device 400, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 402 may include one or more processors 420 to execute instructions to complete all or part of the steps of the above-mentioned method. In addition, the processing component 402 may include one or more modules to facilitate the interaction between the processing component 402 and other components. For example, the processing component 402 may include a multimedia module to facilitate the interaction between the multimedia component 408 and the processing component 402.

[0144] The memory 404 is configured to store various types of data to support operations on the electronic device 400. Examples of such data include instructions for any application or method operating on the electronic device 400, contact data, phone book data, messages, pictures, videos, etc. The memory 404 can be implemented by any type of volatile or non-volatile storage terminal or a combination thereof, 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 disk or optical disk.

[0145] The power supply component 406 provides power to the various components of the electronic device 400. The power supply component 406 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the electronic device 400.

[0146] The multimedia component 408 includes a screen that provides an output interface between the electronic device 400 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 input signals from the 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 boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 408 includes a front camera module and / or a rear camera module. When the electronic device 400 is in an operating mode, such as a shooting mode or a video mode, the front camera module and / or the rear camera module may receive external multimedia data. Each front camera module and the rear camera module may be a fixed optical lens system or have a focal length and optical zoom capability.

[0147] The audio component 410 is configured to output and / or input audio signals. For example, the audio component 410 includes a microphone (MIC), and when the electronic device 400 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 404 or sent via the communication component 416. In some embodiments, the audio component 410 also includes a speaker for outputting audio signals.

[0148] I / O interface 412 provides an interface between processing component 402 and peripheral interface modules, such as 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.

[0149] The sensor assembly 414 includes one or more sensors for providing various aspects of status assessment for the electronic device 400. For example, the sensor assembly 414 can detect the open / closed state of the electronic device 400, the relative positioning of components, such as the display and keypad of the electronic device 400, and the sensor assembly 414 can also detect the position change of the electronic device 400 or a component of the electronic device 400, the presence or absence of user contact with the electronic device 400, the orientation or acceleration / deceleration of the electronic device 400, and the temperature change of the electronic device 400. The sensor assembly 414 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 414 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 414 may also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0150] The communication component 416 is configured to facilitate wired or wireless communication between the electronic device 400 and other terminals. The electronic device 400 can access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof. In an exemplary embodiment, the communication component 416 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 416 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0151] In an exemplary embodiment, the electronic device 400 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing terminals (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to perform the above-described methods.

[0152] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 404 including instructions, and the above instructions can be executed by the processor 420 of the electronic device 400 to complete the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a tape, a floppy disk, and an optical data storage terminal. When the instructions in the storage medium are executed by the processor of the terminal, the terminal is enabled to perform the method shown in the above embodiment.

[0153] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0154] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0155] It should be understood that the present disclosure is not limited to the exact structures 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 limited only by the appended claims.

Claims

1. A battery protection circuit, characterized in that: The battery protection circuit comprises: A fuel gauge, wherein a first end of the fuel gauge is used to couple with a battery cell of the battery; a first protection circuit, wherein a first end of the first protection circuit is used to couple with the battery cell, a second end of the first protection circuit is coupled with a second end of the fuel gauge, and the first protection circuit is used to control whether the fuel gauge is turned off according to the voltage of the battery cell; A first switch unit, wherein a first end of the first switch unit is used to couple with the battery cell, a second end of the first switch unit is used to couple with a load, a third end of the first switch unit is coupled with a third end of the fuel gauge, and the first switch unit is used to control the on / off between the battery cell and the load; The power meter is used to control whether the first switch unit is disconnected according to the voltage of the battery cell.

2. The battery protection circuit according to claim 1, characterized in that: The third end of the first protection circuit is used to couple with a charging device. The first protection circuit is also used to control whether the fuel gauge is turned on according to the voltage of the battery cell when the charging device is connected.

3. The battery protection circuit according to claim 1, characterized in that: The battery protection circuit also includes: a second switch unit, wherein a first end of the second switch unit is used to couple with the battery cell, a second end of the second switch unit is coupled with a third end of the first protection circuit and is used to couple with a load, a third end of the second switch unit is coupled with a second end of the first protection circuit, and the second switch unit is used to control the on / off connection between the battery cell and the load; The first protection circuit is further used to control the second switch unit to be turned on and off according to the voltage of the battery cell.

4. The battery protection circuit according to any one of claims 1 to 3, characterized in that: The battery protection circuit also includes: a second protection circuit, wherein a first end of the second protection circuit is used to couple with the battery cell, a second end of the second protection circuit is coupled with a third end of the electricity meter, and a third end of the second protection circuit is coupled with a third end of the first switch unit; The power meter is used to control whether the second protection circuit disconnects the first switch unit according to the voltage of the battery cell.

5. The battery protection circuit according to claim 4, characterized in that: The fourth end of the second protection circuit is used to couple with a charging device, and the second protection circuit is used to control whether the first switch unit is turned on according to the voltage of the battery cell when the charging device is connected.

6. A control method for a battery protection circuit according to any one of claims 1 to 5, characterized in that: The control method of the battery protection circuit comprises: When the voltage of the battery cell is less than a first preset voltage, the fuel gauge is turned off.

7. The control method of the battery protection circuit according to claim 6, characterized in that: The control method of the battery protection circuit also includes: When connected to a charging device, if the voltage of the battery cell is greater than or equal to the first preset voltage, the fuel gauge is turned on.

8. The control method of the battery protection circuit according to claim 7, characterized in that: After turning on the fuel gauge, the control method of the battery protection circuit further includes: The second switch unit is turned on.

9. The control method of the battery protection circuit according to claim 6, characterized in that: The operation mode of the first protection circuit includes a first mode and a second mode, and the power consumption of the second mode is less than the power consumption of the first mode; when the voltage of the battery cell is less than the first preset voltage, the control method of the battery protection circuit further includes: Disconnecting the second switch unit; controlling the first protection circuit to operate in the second mode; When the voltage of the battery cell is greater than or equal to the first preset voltage, the control method of the battery protection circuit further includes: The first protection circuit is controlled to operate in the first mode.

10. The control method of the battery protection circuit according to any one of claims 6 to 9, characterized in that: The control method of the battery protection circuit also includes: When the voltage of the battery cell is less than the second preset voltage and the duration reaches a preset time, the second protection circuit is controlled to disconnect the first switch unit.

11. The control method of the battery protection circuit according to claim 10, characterized in that: The controlling the second protection circuit to disconnect the first switch unit comprises: A pulse signal is sent to the second protection circuit.

12. The control method of the battery protection circuit according to claim 10, characterized in that: The control method of the battery protection circuit also includes: When connected to a charging device, if the voltage of the battery cell is greater than or equal to a third preset voltage, turning on the first switch unit; The first preset voltage is smaller than the third preset voltage, and the third preset voltage is smaller than the second preset voltage.

13. The control method of the battery protection circuit according to claim 12, characterized in that: The operation mode of the second protection circuit includes a third mode and a fourth mode, and the power consumption of the fourth mode is less than the power consumption of the third mode; The control method of the battery protection circuit also includes: When the voltage of the battery cell is less than the third preset voltage, controlling the second protection circuit to operate in the fourth mode; When the voltage of the battery cell is greater than or equal to the third preset voltage, the second protection circuit is controlled to operate in the third mode.

14. A battery, characterized in that: The battery comprises the battery protection circuit according to any one of claims 1 to 5.

15. An electronic device, characterized in that: The electronic device comprises the battery as claimed in claim 14.

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