Battery protection circuit, battery protection board, battery pack and electronic equipment

Abstract

This disclosure relates to a battery protection circuit, a battery protection board, a battery assembly, and an electronic device. The battery protection circuit includes: a switching circuit, with a first terminal electrically connected to the negative terminal of the battery cell and a second terminal electrically connected to a first terminal of the main board; a protection circuit, with a first terminal electrically connected to both the positive terminal of the battery cell and a second terminal of the main board, and a second terminal electrically connected to a control terminal of the switching circuit; and a control circuit, with a first terminal electrically connected to a third terminal of the main board and a second terminal electrically connected to the control terminal of the switching circuit. The control circuit is used to turn the switching circuit on or off upon receiving a first signal from the main board, the first signal indicating whether a user identification card is present. This battery protection circuit can promptly disconnect the power supply path from the battery cell to the main board when the device is powered off and the user identification card is not present, thereby reducing the power consumption of the electronic device.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a battery protection circuit, a battery protection board, a battery assembly, and an electronic device. Background Technology

[0002] A battery protection circuit is a safety management circuit designed for rechargeable batteries. It monitors the battery status in real time to prevent damage caused by abnormal conditions such as overcharging, over-discharging, overcurrent, and short circuits. However, because the battery cells continue to supply power to the load through the battery protection circuit even after the electronic device is turned off, the power consumption of the electronic device is high. Utility Model Content

[0003] To overcome the problems existing in related technologies, this disclosure provides a battery protection circuit, a battery protection board, a battery assembly, 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 switching circuit, wherein a first terminal of the switching circuit is used to electrically connect to the negative terminal of the battery cell, and a second terminal of the switching circuit is used to electrically connect to the first terminal of the motherboard;

[0006] A protection circuit, wherein the first terminal of the protection circuit is electrically connected to both the positive terminal of the battery cell and the second terminal of the main board, and the second terminal of the protection circuit is electrically connected to the control terminal of the switching circuit;

[0007] The control circuit has a first terminal electrically connected to the third terminal of the motherboard and a second terminal electrically connected to the control terminal of the switch circuit. The control circuit is used to turn the switch circuit on or off under a first signal issued by the motherboard. The first signal is used to reflect whether the user identification card is in place.

[0008] In this embodiment, the control circuit controls the switching circuit to turn on or off based on a first signal from the motherboard indicating whether the user identification card is present, thereby controlling the power supply path from the battery cell to the motherboard. When the electronic device is powered off and the user identification card is not present, the power supply path from the battery cell to the motherboard can be promptly disconnected, avoiding issues such as battery cell bulging caused by low voltage, prolonged activation time for restarting the electronic device, or even failure to power on. This reduces the power consumption of the electronic device and improves its reliability.

[0009] In some exemplary embodiments of this disclosure, the battery protection circuit further includes:

[0010] The first resistor is electrically connected between the first terminal of the switching circuit and the negative terminal of the battery cell.

[0011] The third terminal of the control circuit is electrically connected to the first terminal of the switching circuit. The control circuit is used to turn the switching circuit on or off under the first signal and the current of the battery cell.

[0012] In this embodiment, by setting a first resistor, the control circuit can obtain the current of the battery cell, and turn the switching circuit on or off based on the current of the battery cell and a first signal indicating whether the user identification card is present. When the electronic device is powered off and the user identification card is not present, the power supply path from the battery cell to the motherboard can be promptly disconnected, avoiding problems such as battery cell bulging caused by low battery voltage and long activation times or even failure to power on the electronic device. This reduces the power consumption of the electronic device without affecting user operation.

[0013] In some exemplary embodiments of this disclosure, the control circuit includes:

[0014] A first switching unit, wherein a first end of the first switching unit is electrically connected to the positive terminal of the battery cell, a second end of the first switching unit is electrically connected to the control terminal of the switching circuit, and the control terminal of the first switching unit is electrically connected to the third terminal of the motherboard;

[0015] A signal conversion circuit, wherein a first terminal of the signal conversion circuit is electrically connected to a first terminal of the switching circuit, and a second terminal of the signal conversion circuit is electrically connected to a second terminal of the first switching unit, the signal conversion circuit being used to convert the current of the battery cell from an analog signal to a digital signal.

[0016] In this embodiment, the first signal from the motherboard controls the output level of the first switching unit, and the current of the battery cell indirectly controls the output level of the signal conversion circuit. The two together control the switching circuit's on / off state. When the electronic device is powered off and the user identification card is not present, the power supply path from the battery cell to the motherboard can be promptly disconnected. This avoids issues such as battery cell bulging caused by low voltage, long activation times for restarting the electronic device, or even failure to power on, thereby reducing power consumption and improving reliability.

[0017] In some exemplary embodiments of this disclosure, the signal conversion circuit includes:

[0018] An analog-to-digital converter circuit, wherein the input terminal of the analog-to-digital converter circuit is electrically connected to the first terminal of the switching circuit;

[0019] A unidirectional conduction unit is provided, wherein the first end of the unidirectional conduction unit is electrically connected to the output end of the analog-to-digital conversion circuit, and the second end of the unidirectional conduction unit is electrically connected to the second end of the first switching unit. The unidirectional conduction unit is used to enable unidirectional conduction from the output end of the analog-to-digital conversion circuit to the control end of the switching circuit.

[0020] In this embodiment, the unidirectional conduction unit enables the output terminal of the analog-to-digital converter circuit to conduct unidirectionally to the control terminal of the switching circuit, realizing the unidirectional transmission of the control level of the conversion circuit to the switching circuit, avoiding the current of the first switching unit from flowing back to the output terminal of the analog-to-digital converter circuit, thereby improving the reliability of the battery protection circuit.

[0021] In some exemplary embodiments of this disclosure, the control circuit further includes:

[0022] A voltage regulator circuit is electrically connected between the first terminal of the first switching unit and the positive terminal of the battery cell, and the voltage regulator circuit is used to stabilize the voltage of the battery cell.

[0023] In this embodiment, by adding a voltage regulator circuit, the voltage at the first terminal of the first switching unit can be stabilized to prevent the switching circuit from failing to operate normally, thereby improving the reliability of the battery protection circuit.

[0024] In some exemplary embodiments of this disclosure, the third terminal of the motherboard includes a first sub-signal terminal, and at least one of a second sub-signal terminal and a third sub-signal terminal. The first sub-signal terminal is used to transmit the first signal, the second sub-signal terminal is used to transmit the second signal, and the third sub-signal terminal is used to transmit the third signal. The second signal is used to reflect whether a button is pressed, and the third signal is used to reflect whether a charging device is connected.

[0025] The control circuit has multiple first terminals, each of which is electrically connected to one of the first sub-signal terminal, the second sub-signal terminal, and the third sub-signal terminal. The control circuit is used to turn the switching circuit on or off under at least one of the first signal, the second signal, and the third signal.

[0026] In this embodiment, the control circuit controls the switching circuit to turn on or off based on the second and / or third signals that serve as wake-up signals and whether the user identification card is in place. This allows the electronic device to be woken up even when the power supply path from the battery cell to the motherboard is disconnected, avoiding the problem of the electronic device requiring a long activation time or even failing to power on, thereby improving the reliability of the battery protection circuit.

[0027] In some exemplary embodiments of this disclosure, the control circuit further includes:

[0028] A second switching unit, wherein a first terminal of the second switching unit is electrically connected to the positive terminal of the battery cell, a second terminal of the second switching unit is electrically connected to the control terminal of the switching circuit, and the control terminal of the second switching unit is electrically connected to the second sub-signal terminal; and / or,

[0029] The third switching unit has a first end that is electrically connected to the positive terminal of the battery cell, a second end that is electrically connected to the control terminal of the switching circuit, and a control terminal that is electrically connected to the third sub-signal terminal.

[0030] In this embodiment, by setting a second switch unit and a third switch unit, the switch circuit can be turned on when the switch circuit is turned off to prevent the battery cell from being unable to supply power, thereby improving the reliability of the battery protection circuit.

[0031] In some exemplary embodiments of this disclosure, the battery protection circuit further includes:

[0032] A fuel gauge is electrically connected between the second terminal of the control circuit and the third terminal of the protection circuit. The second terminal of the control circuit is electrically connected to the control terminal of the switching circuit through the fuel gauge and the protection circuit. The fuel gauge is used to turn the switching circuit on or off under the control signal issued by the control circuit.

[0033] In this embodiment, when the motherboard is powered off and the user identification card is not in place, the power meter can control the power supply path from the battery cell to the motherboard to be disconnected in a timely manner, avoiding the problems of battery cell bulging caused by low battery cell voltage and the long activation time or even failure to power on the electronic device, thereby reducing the power consumption of the electronic device.

[0034] In some exemplary embodiments of this disclosure, the protection circuit includes a first protection sub-circuit and a second protection sub-circuit; the switching circuit includes:

[0035] The fourth switching unit has a first terminal for electrical connection to the negative terminal of the battery cell, and a control terminal for electrical connection to the discharge control terminal of the second protection sub-circuit.

[0036] The fifth switching unit has its first terminal electrically connected to the second terminal of the fourth switching unit, and its control terminal electrically connected to the charging control terminal of the second protection sub-circuit.

[0037] The sixth switching unit has its first terminal electrically connected to the second terminal of the fifth switching unit, and its control terminal electrically connected to the discharge control terminal of the first protection sub-circuit.

[0038] The seventh switch unit has a first end electrically connected to the second end of the sixth switch unit, the second end of the seventh switch unit is used to electrically connect to the first end of the motherboard, and the control end of the seventh switch unit is electrically connected to the charging control end of the first protection sub-circuit.

[0039] In this embodiment, the battery protection circuit has charging protection and discharging protection functions. It can promptly disconnect the corresponding switching unit to protect the battery cell when abnormal charging or discharging occurs, thereby improving the reliability of the battery protection circuit.

[0040] In some exemplary embodiments of this disclosure, the second terminal of the control circuit is electrically connected to the control terminal of the seventh switch unit; or, the second terminal of the control circuit is electrically connected to the control terminals of the sixth switch unit and the seventh switch unit through the fuel gauge and the first protection sub-circuit in the battery protection circuit.

[0041] In this embodiment, in addition to promptly disconnecting the corresponding switching unit when abnormal charging or discharging occurs, the battery protection circuit can also promptly disconnect the power supply path from the battery cell to the motherboard when the electronic device is powered off and the user identification card is not in place, making the protection function more comprehensive.

[0042] According to a second aspect of the present disclosure, a battery protection board is provided, the battery protection board including the battery protection circuit as described in the first aspect of the present disclosure.

[0043] According to a third aspect of the present disclosure, a battery assembly is provided, the battery assembly including battery cells and a battery protection board as described in the second aspect of the present disclosure.

[0044] According to a fourth aspect of the present disclosure, an electronic device is provided, the electronic device including a motherboard and a battery assembly as described in the third aspect of the present disclosure.

[0045] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0046] In the battery protection circuit disclosed herein, the control circuit controls the switching circuit to turn on or off based on a first signal from the motherboard indicating whether the user identification card is present, thereby controlling the power supply path from the battery cell to the motherboard to be turned on or off. When the electronic device is powered off and the user identification card is not present, the power supply path from the battery cell to the motherboard can be promptly disconnected, avoiding issues such as battery cell bulging caused by low battery voltage, prolonged activation time for restarting the electronic device, or even failure to power on. This reduces the power consumption of the electronic device and improves its reliability.

[0047] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0048] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0049] Figure 1 This is a schematic diagram of a battery protection circuit according to an exemplary embodiment;

[0050] Figure 2 This is a schematic diagram of a battery protection circuit according to another exemplary embodiment;

[0051] Figure 3 This is a schematic diagram of a battery protection circuit according to another exemplary embodiment;

[0052] Figure 4 This is a schematic diagram of a battery protection circuit according to another exemplary embodiment;

[0053] Figure 5 This is a schematic diagram of a battery protection circuit according to another exemplary embodiment;

[0054] Figure 6 This is a schematic diagram of a battery protection circuit according to another exemplary embodiment;

[0055] Figure 7 This is a schematic diagram of a battery protection circuit according to another exemplary embodiment;

[0056] Figure 8 This is a schematic diagram of a battery protection circuit according to another exemplary embodiment;

[0057] Figure 9 This is a schematic diagram of a battery protection circuit according to another exemplary embodiment;

[0058] Figure 10 This is a block diagram of an electronic device according to an exemplary embodiment.

[0059] In the picture:

[0060] 1-Battery protection circuit; 2-Battery cell; 3-Main board; 11-Switching circuit; 12-Protection circuit; 13-Control circuit; 14-First resistor; 15-Fuel meter; 111-Fourth switching unit; 112-Fifth switching unit; 113-Sixth switching unit; 114-Seventh switching unit; 121-First protection sub-circuit; 122-Second protection sub-circuit; 131-First switching unit; 132-Signal conversion circuit; 133-Voltage regulator circuit; 134- Second switching unit; 135-Third switching unit; 136-Second resistor; 137-Third resistor; 1000-Electronic device; 1002-Processing component; 1004-Memory; 1006-Power supply component; 1008-Multimedia component; 1010-Audio component; 1012-I / O interface; 1014-Sensor component; 1016-Communication component; 1020-Processor; 1321-Analog-to-digital conversion circuit; 1322-One-way conduction unit. Detailed Implementation

[0061] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0062] A battery protection circuit is a safety management circuit designed for rechargeable batteries. It is used to monitor the battery status in real time and prevent battery damage caused by abnormal conditions such as overcharging, over-discharging, overcurrent, and short circuits.

[0063] Currently, even when an electronic device is powered off and the Subscriber Identity Module (SIM) card is not in place (not inserted or poor contact causing recognition failure), the battery cell continues to supply power to the load electrically connected to the motherboard. During this power supply process, the battery cell voltage continuously decreases. As the battery cell voltage continues to drop, the internal chemical reactions are severely affected when the cell is at a low voltage state, leading to increased internal pressure and potentially causing the cell to bulge. When the battery cell voltage continues to drop below a safe threshold, the battery protection circuit will cut off the cell's output due to over-discharge. At this point, restarting the electronic device requires a long activation time, or may even fail to power on.

[0064] To address the aforementioned issues, this disclosure provides a battery protection circuit. The control circuit controls the switching circuit to turn on or off based on a first signal from the motherboard indicating whether a user identification card is present, thereby controlling the power supply path from the battery cell to the motherboard. When the electronic device is powered off and the user identification card is not present, the power supply path from the battery cell to the motherboard can be promptly disconnected, avoiding issues such as battery cell bulging due to low voltage, prolonged activation time for restarting the electronic device, or even failure to power on. This reduces the power consumption of the electronic device and improves its reliability.

[0065] An exemplary embodiment of this disclosure provides a battery protection circuit, such as Figure 1 As shown, the battery protection circuit 1 includes a switching circuit 11, a protection circuit 12, and a control circuit 13.

[0066] The first terminal of the switching circuit 11 is electrically connected to the negative terminal of the battery cell 2, and the second terminal of the switching circuit 11 is electrically connected to the first terminal of the motherboard 3. When the switching circuit 11 is on, the power supply path from the battery cell 2 to the motherboard 3 is open. When the switching circuit 11 is off, the power supply path from the battery cell 2 to the motherboard 3 is closed. In some examples, the switching circuit 11 may include multiple transistors connected in series. By disconnecting some of the multiple transistors connected in series, the power supply path from the battery cell 2 to the motherboard 3 can be disconnected. By turning on all the transistors, the power supply path from the battery cell 2 to the motherboard 3 can be turned on. In other examples, the switching circuit 11 may be provided in multiple parallel power supply paths, each power supply path including multiple transistors connected in series. That is, the switching circuit 11 has multiple control terminals, and the control terminal of each transistor is one control terminal of the switching circuit 11.

[0067] The first terminal of the protection circuit 12 is electrically connected to both the positive terminal of the battery cell 2 and the second terminal of the main board 3. The second terminal of the protection circuit 12 is electrically connected to the control terminal of the switching circuit 11. In some examples, the protection circuit 12 includes one or more protection chips. These chips are responsible for real-time monitoring of parameters such as voltage, current, and temperature of the battery cell 2 and triggering a protection mechanism under abnormal conditions (e.g., overcharge, over-discharge, overcurrent, short circuit, etc.). The control terminal of the switching circuit 11 is used to disconnect the switching circuit 11 to ensure the safety of the battery cell 2.

[0068] The first terminal of the control circuit 13 is electrically connected to the third terminal of the motherboard 3, and the second terminal of the control circuit 13 is electrically connected to the control terminal of the switch circuit 11. The control circuit 13 is used to turn the switch circuit 11 on or off upon receiving a first signal from the motherboard 3. The first signal indicates whether the user identification card is present. In some examples, when the electronic device is powered off and the first signal indicates that the user identification card is not present, the control circuit 13 controls the switch circuit 11 to turn off via the control terminal. In other examples, when the electronic device is powered off and the first signal indicates that the user identification card is present, or when the electronic device is powered on, the control circuit 13 controls the switch circuit 11 to turn on via the control terminal. The control circuit 13 may include one or more transistors and / or one or more integrated chips. The control circuit 13 may also include a processor.

[0069] In this embodiment, the control circuit controls the switching circuit to turn on or off based on a first signal from the motherboard indicating whether the user identification card is present, thereby controlling the power supply path from the battery cell to the motherboard. When the electronic device is powered off and the user identification card is not present, the power supply path from the battery cell to the motherboard can be promptly disconnected, avoiding issues such as battery cell bulging caused by low voltage, prolonged activation time for restarting the electronic device, or even failure to power on. This reduces the power consumption of the electronic device and improves its reliability.

[0070] In some embodiments, such as Figure 2 As shown, the battery protection circuit 1 also includes a first resistor 14. The first resistor 14 is electrically connected between the first terminal of the switching circuit 11 and the negative terminal of the battery cell 12. The current flowing through the first resistor 14 is the same as the current in the battery cell.

[0071] The third terminal of the control circuit 13 is electrically connected to the first terminal of the switch circuit 11. The first terminal of the switch circuit 11 is connected to the first resistor 14. At this connection position, the control circuit 13 can obtain the voltage reflecting the current of the battery cell 2 through the first resistor 14.

[0072] Control circuit 13 is used to turn switch circuit 11 on or off based on the first signal and the current of battery cell 2. In some examples, the current of battery cell 2 is greater than or equal to the threshold current, indicating that the electronic device is powered on. In this case, regardless of whether the first signal indicates that the user identification card is present, control circuit 13 turns on switch circuit 11, thereby opening the power supply path from battery cell 2 to motherboard 3. In other examples, the current of battery cell 2 is less than the threshold current, indicating that the electronic device is powered off. In this case, if the first signal indicates that the user identification card is present, control circuit 13 turns on switch circuit 11, thereby opening the power supply path from battery cell 2 to motherboard 3. If the first signal indicates that the user identification card is not present, control circuit 13 turns off switch circuit 11, thereby disconnecting the power supply path from battery cell 2 to motherboard 3.

[0073] In this embodiment, by setting a first resistor, the control circuit can obtain the current of the battery cell, and turn the switching circuit on or off based on the current of the battery cell and a first signal indicating whether the user identification card is present. When the electronic device is powered off and the user identification card is not present, the power supply path from the battery cell to the motherboard can be promptly disconnected, avoiding problems such as battery cell bulging caused by low battery voltage and long activation times or even failure to power on the electronic device. This reduces the power consumption of the electronic device without affecting user operation.

[0074] In some embodiments, such as Figure 3 As shown, the control circuit 13 includes a first switching unit 131 and a signal conversion circuit 132.

[0075] The first terminal of the first switching unit 131 is electrically connected to the positive terminal of the battery cell 2, the second terminal of the first switching unit 131 is electrically connected to the control terminal of the switching circuit 11, and the control terminal of the first switching unit 131 is electrically connected to the third terminal of the main board 3. The first terminal of the signal conversion circuit 132 is electrically connected to the first terminal of the switching circuit 11, and the second terminal of the signal conversion circuit 132 is electrically connected to the second terminal of the first switching unit 131. The signal conversion circuit 132 is used to convert the current of the battery cell 2 from an analog signal to a digital signal.

[0076] The second terminal of the first switching unit 131 and the second terminal of the signal conversion circuit 132 are both electrically connected to the control terminal of the switching circuit 11, controlling the switching circuit 11 to be turned on or off.

[0077] Signal conversion circuit 132 converts the current of cell 2. In some examples, when the current of cell 2 is greater than or equal to a threshold current, the output level of the second terminal of signal conversion circuit 132 is high. When the current of cell 2 is less than the threshold current, the output level of the second terminal of signal conversion circuit 132 is low.

[0078] The first signal controls the output level of the second terminal of the first switching unit 131. The output level of the second terminal of the first switching unit 131, combined with the output level of the second terminal of the signal conversion circuit 132, controls the on / off state of the switching circuit 11. In some examples, when the electronic device is powered on, regardless of whether the user identification card is present as indicated by the first signal, the output level of the second terminal of the first switching unit 131 is always high. At this time, the output level of the second terminal of the signal conversion circuit 132 is also high, and the switching circuit 11 is turned on under the control of the high level. When the electronic device is powered off and the user identification card is present as indicated by the first signal, the high level output of the second terminal of the first switching unit 131 pulls up the low level output of the second terminal of the signal conversion circuit 132, and the switching circuit 11 is turned on under the control of the high level. When the electronic device is powered off and the user identification card is not present as indicated by the first signal, the low level output of the second terminal of the first switching unit 131 does not affect the low level output of the second terminal of the signal conversion circuit 132, and the switching circuit 11 is turned off under the control of the low level.

[0079] In some examples, the first switching unit 131 may include a P-type transistor. In other examples, the first switching unit 131 may include a combination of multiple transistors.

[0080] In this embodiment, the first signal from the motherboard controls the output level of the first switching unit, and the current of the battery cell indirectly controls the output level of the signal conversion circuit. The two together control the switching circuit's on / off state. When the electronic device is powered off and the user identification card is not present, the power supply path from the battery cell to the motherboard can be promptly disconnected. This avoids issues such as battery cell bulging caused by low voltage, long activation times for restarting the electronic device, or even failure to power on, thereby reducing power consumption and improving reliability.

[0081] In some embodiments, such as Figure 4 As shown, the signal conversion circuit 132 may include an analog-to-digital converter circuit 1321 and a unidirectional conduction unit 1322. The input terminal of the analog-to-digital converter circuit 1321 is electrically connected to the first terminal of the switching circuit 11. The first terminal of the unidirectional conduction unit 1322 is electrically connected to the output terminal of the analog-to-digital converter circuit 1321, and the second terminal of the unidirectional conduction unit 1322 is electrically connected to the second terminal of the first switching unit 131. The unidirectional conduction unit 1322 is used to unidirectionally conduct the output terminal of the analog-to-digital converter circuit 1321 to the control terminal of the switching circuit 11.

[0082] In some examples, when the current in cell 2 is greater than or equal to the threshold current, the output level of the analog-to-digital converter circuit 1321 is high. When the current in cell 2 is less than the threshold current, the output level of the analog-to-digital converter circuit 1321 is low.

[0083] In some examples, the unidirectional conduction unit 1322 may include a diode. The anode of the diode is electrically connected to the output terminal of the analog-to-digital converter circuit 1321, and the cathode of the diode is electrically connected to the second terminal of the first switching unit 131, thereby enabling unidirectional conduction of the output terminal of the analog-to-digital converter circuit 1321 to the control terminal of the switching circuit 11.

[0084] In this embodiment, the unidirectional conduction unit enables the output terminal of the analog-to-digital converter circuit to conduct unidirectionally to the control terminal of the switching circuit, realizing the unidirectional transmission of the control level of the conversion circuit to the switching circuit, avoiding the current of the first switching unit from flowing back to the output terminal of the analog-to-digital converter circuit, thereby improving the reliability of the battery protection circuit.

[0085] In some examples, the signal conversion circuit 132 may also include a comparator circuit and a unidirectional conduction unit 1322. The first input terminal of the comparator circuit is electrically connected to the first terminal of the switching circuit 11, and the second input terminal of the comparator circuit is used to receive a preset voltage, which can be set according to a threshold current and the resistance value of the first resistor 14. The first terminal of the unidirectional conduction unit 1322 is electrically connected to the output terminal of the comparator circuit, and the second terminal of the unidirectional conduction unit 1322 is electrically connected to the second terminal of the first switching unit 131. The unidirectional conduction unit 1322 is used to unidirectionally conduct the output terminal of the comparator circuit to the control terminal of the switching circuit 11.

[0086] In some embodiments, such as Figure 4 As shown, the control circuit 13 also includes a voltage regulator circuit 133. The voltage regulator circuit 133 is electrically connected between the first terminal of the first switching unit 131 and the positive terminal of the battery cell 2, and is used to stabilize the voltage of the battery cell 2.

[0087] The voltage of cell 2 may fluctuate. Voltage regulator circuit 133 is used to stabilize the voltage of cell 2, outputting a stable voltage to the first terminal of the first switching unit 131. In some examples, voltage regulator circuit 133 may include a low dropout regulator (LDO), which is capable of stabilizing the output DC voltage when the input voltage is only slightly higher than the output voltage. In other examples, voltage regulator circuit 133 may also include other voltage conversion circuits.

[0088] In this embodiment, by adding a voltage regulator circuit, the voltage at the first terminal of the first switching unit can be stabilized to prevent the switching circuit from failing to operate normally, thereby improving the reliability of the battery protection circuit.

[0089] In some embodiments, the third terminal of the motherboard 3 includes a first sub-signal terminal, and at least one of a second sub-signal terminal and a third sub-signal terminal.

[0090] The first sub-signal terminal is used to transmit a first signal. In some examples, the first signal is low when the user identification card is present. When the user identification card is not present, the first signal is floating. In other examples, the first signal can be floating or high when the user identification card is present, and low when the user identification card is not present.

[0091] The second sub-signal terminal is used to transmit a second signal, which reflects whether the button is pressed. The button can be the power button of an electronic device. In some examples, the second signal is low when the button is pressed. When the button is not pressed, the second signal is high or floating.

[0092] The third sub-signal terminal is used to transmit a third signal, which indicates whether a charging device is connected. The charging device can be a device that charges the battery cells. In some examples, the third signal is high when the charging device is connected, and low or floating when the charging device is not connected.

[0093] The control circuit 13 has multiple first terminals, each of which is electrically connected to one of the first, second, and third sub-signal terminals. The control circuit 13 is used to turn the switch circuit 11 on or off based on at least one of the first, second, and third signals. In some examples, when the second signal is low or the third signal is high, the electronic device is powered on. In this case, regardless of whether the first signal is low (i.e., regardless of whether the user identification card is present), the control circuit 13 controls the switch circuit 11 to be on. When the second signal is not low and the third signal is not high, the electronic device is powered off and not being powered on or charged. In this case, if the first signal is low, it indicates that the user identification card is present, and the control circuit 13 controls the switch circuit 11 to be on. If the first signal is floating, it indicates that the user identification card is not present, and the control circuit 13 controls the switch circuit 11 to be off. In other examples, the control circuit 13 can use other control logic to turn the switch circuit 11 on or off based on the first signal and at least one of the second and third signals.

[0094] The first, second, and third sub-signal terminals can be first divided by a voltage divider circuit, and then the divided voltages can be stabilized by a filter capacitor to transmit the first, second, and third signals to the corresponding first terminals of the control circuit 13. If the control circuit 13 includes three first terminals, one first terminal is electrically connected to the first sub-signal terminal through a voltage divider circuit and a filter capacitor, one first terminal is electrically connected to the second sub-signal terminal through a voltage divider circuit and a filter capacitor, and one first terminal is electrically connected to the third sub-signal terminal through a voltage divider circuit and a filter capacitor.

[0095] In this embodiment, the control circuit controls the switching circuit to turn on or off based on the second and / or third signals that serve as wake-up signals and whether the user identification card is in place. This allows the electronic device to be woken up even when the power supply path from the battery cell to the motherboard is disconnected, avoiding the problem of the electronic device requiring a long activation time or even failing to power on, thereby improving the reliability of the battery protection circuit.

[0096] In some embodiments, such as Figure 5 As shown, the control circuit 13 also includes a second switching unit 134 and / or a third switching unit 135.

[0097] The first terminal of the second switching unit 134 is electrically connected to the positive terminal of the battery cell 2, and the second terminal of the second switching unit 134 is electrically connected to the control terminal of the switching circuit 11. The control terminal of the second switching unit 134 is also electrically connected to the second sub-signal terminal. In some examples, the second switching unit 134 may include a P-type transistor. When the second signal is low, the second switching unit 134 is turned on, and the level at the second terminal of the second switching unit 134 is high. When the second signal is high or floating, the second switching unit 134 is turned off. In other examples, the second switching unit 134 may include a combination of multiple transistors.

[0098] The first terminal of the third switching unit 135 is electrically connected to the positive terminal of the battery cell 2, and the second terminal of the third switching unit 135 is electrically connected to the control terminal of the switching circuit 11. The control terminal of the third switching unit 135 is also electrically connected to the third sub-signal terminal. In some examples, the third switching unit 135 may include an N-type transistor. When the third signal is high, the third switching unit 135 is turned on, and the level at the second terminal of the third switching unit 135 is high. When the third signal is low or floating, the third switching unit 135 is turned off. In other examples, the third switching unit 135 may include a combination of multiple transistors.

[0099] In some examples, the battery protection circuit 1 also includes a second resistor and a third resistor. The second resistor may be electrically connected between the second terminal of the second switching unit 134 and the control terminal of the switching circuit 11. The third resistor may be electrically connected between the second terminal of the third switching unit 135 and the control terminal of the switching circuit 11. Both the second and third resistors are current-limiting resistors.

[0100] In this embodiment, by setting a second switch unit and a third switch unit, the switch circuit can be turned on when the switch circuit is turned off to prevent the battery cell from being unable to supply power, thereby improving the reliability of the battery protection circuit.

[0101] In some embodiments, such as Figure 6 As shown, the battery protection circuit 1 also includes a fuel gauge 15. The fuel gauge 15 is electrically connected between the second terminal of the control circuit 13 and the third terminal of the protection circuit 12. The second terminal of the control circuit 13 is electrically connected to the control terminal of the switch circuit 11 through the fuel gauge 15 and the protection circuit 12. The fuel gauge 15 is used to turn the switch circuit 11 on or off under the control signal issued by the control circuit 13. The control signal can be a combined level of the output level of the second terminal of the first switch unit 131, the output level of the second terminal of the second switch unit 134, the output level of the second terminal of the third switch unit 135, and the output level of the second terminal of the unidirectional conduction unit 1322. That is, the fuel gauge 15 is electrically connected to the second terminals of the first switch unit 131, the second terminal of the second switch unit 134, the second terminal of the third switch unit 135, and the second terminal of the unidirectional conduction unit 1322.

[0102] In some examples, when the control signal from control circuit 13 indicates that the electronic device is powered off and the user identification card is not present, the fuel gauge 15 controls the switch circuit 11 to disconnect via protection circuit 12. When the control signal from control circuit 13 indicates that the electronic device is not powered off, or that the electronic device is powered off and the user identification card is present, the fuel gauge 15 controls the switch circuit 11 to turn on via protection circuit 12. Depending on the functional terminal of the fuel gauge 15 electrically connected to control circuit 13, the control signal can be directly transmitted to the functional terminal of fuel gauge 15, or the control signal level can be inverted via an inverting circuit before being transmitted to the functional terminal of fuel gauge 15.

[0103] In this embodiment, when the electronic device is powered off and the user identification card is not in place, the power meter can control the power supply path from the battery cell to the motherboard to be disconnected in a timely manner, avoiding the problems of battery cell bulging caused by low battery cell voltage and the long activation time or even failure to power on the electronic device, thereby reducing the power consumption of the electronic device.

[0104] In some embodiments, such as Figure 7As shown, the protection circuit 12 includes a first protection sub-circuit 121 and a second protection sub-circuit 122. In some examples, both the first protection sub-circuit 121 and the second protection sub-circuit 122 are protection chips responsible for real-time monitoring of parameters such as voltage, current, and temperature of the battery cell, and triggering protection mechanisms under abnormal conditions (such as overcharging, over-discharging, overcurrent, short circuit, etc.). The first protection sub-circuit 121 can be a primary protection circuit, and the second protection sub-circuit 122 can be a secondary protection circuit. The first protection sub-circuit 121 and the second protection sub-circuit 122 can be integrated into the protection chip respectively.

[0105] The switching circuit 11 includes a fourth switching unit 111, a fifth switching unit 112, a sixth switching unit 113, and a seventh switching unit 114. In some examples, the fourth switching unit 111, the fifth switching unit 112, the sixth switching unit 113, and the seventh switching unit 114 may each include an N-type transistor.

[0106] The first terminal of the fourth switching unit 111 is electrically connected to the negative terminal of the battery cell 2, and the control terminal of the fourth switching unit 111 is electrically connected to the discharge control terminal of the second protection sub-circuit 122. In some examples, when the second protection sub-circuit 122 detects abnormal conditions such as over-discharge, over-current, or short circuit, it controls the fourth switching unit 111 to disconnect through its discharge control terminal to protect the battery cell 2.

[0107] The first terminal of the fifth switching unit 112 is electrically connected to the second terminal of the fourth switching unit 111, and the control terminal of the fifth switching unit 112 is electrically connected to the charging control terminal of the second protection sub-circuit 122. In some examples, when the second protection sub-circuit 122 detects abnormal conditions such as overcharging, charging overcurrent, or reverse charging, it controls the fifth switching unit 112 to disconnect through its charging control terminal to protect the battery cell 2.

[0108] The first terminal of the sixth switching unit 113 is electrically connected to the second terminal of the fifth switching unit 112, and the control terminal of the sixth switching unit 113 is electrically connected to the discharge control terminal of the first protection sub-circuit 121. In some examples, when the first protection sub-circuit 121 detects abnormal conditions such as over-discharge, over-current, or short circuit, it controls the sixth switching unit 113 to disconnect through its discharge control terminal to protect the battery cell 2.

[0109] The first terminal of the seventh switch unit 114 is electrically connected to the second terminal of the sixth switch unit 113. The second terminal of the seventh switch unit 114 is used to electrically connect to the first terminal of the main board 3. The control terminal of the seventh switch unit 114 is electrically connected to the charging control terminal of the first protection sub-circuit 121. In some examples, when the first protection sub-circuit 121 detects abnormal conditions such as overcharging, charging overcurrent, or reverse charging, it controls the seventh switch unit 114 to disconnect through its charging control terminal to protect the battery cell 2.

[0110] In this embodiment, the battery protection circuit has charging protection and discharging protection functions. It can promptly disconnect the corresponding switching unit to protect the battery cell when abnormal charging or discharging occurs, thereby improving the reliability of the battery protection circuit.

[0111] In some embodiments, such as Figure 7 As shown, the second terminal of control circuit 13 is electrically connected to the control terminal of the seventh switching unit 114. Or, as... Figure 8 As shown, the second terminal of the control circuit 13 is electrically connected to the control terminal of the sixth switch unit 113 and the control terminal of the seventh switch unit 114 through the fuel gauge 15 and the first protection sub-circuit 121 in the battery protection circuit 1.

[0112] The control circuit 13 can control the seventh switch unit 114, or the sixth switch unit 113 and the seventh switch unit 114 to be turned on or off.

[0113] In this embodiment, in addition to promptly disconnecting the corresponding switching unit when abnormal charging or discharging occurs, the battery protection circuit can also promptly disconnect the power supply path from the battery cell to the motherboard when the electronic device is powered off and the user identification card is not in place, making the protection function more comprehensive.

[0114] An exemplary embodiment of this disclosure provides a battery protection circuit, such as Figure 9As shown, the battery protection circuit 1 includes a first switch unit 131, a second switch unit 134, a third switch unit 135, a fourth switch unit 111, a fifth switch unit 112, a sixth switch unit 113, a seventh switch unit 114, a first resistor 14, a second resistor 136, a third resistor 137, a first protection sub-circuit 121, a second protection sub-circuit 122, an analog-to-digital converter circuit 1321, a unidirectional conduction unit 1322, and a voltage regulator circuit 133. The first terminal of the first switch unit 131 is electrically connected to the positive terminal of the battery cell 2 and the second terminal of the main board 3 through the voltage regulator circuit 133. The second terminal of the first switch unit 131 is electrically connected to the control terminal of the seventh switch unit 114. The control terminal of the first switch unit 131 is electrically connected to the first sub-signal terminal of the main board 3. The first terminal of the second switch unit 134 is electrically connected to the positive terminal of the battery cell 2. The second terminal of the second switch unit 134 is electrically connected to the control terminal of the seventh switch unit 114 through the second resistor 136. The control terminal of the second switch unit 134 is electrically connected to the second sub-signal terminal of the main board 3. The first terminal of the third switch unit 135 is electrically connected to the positive terminal of the battery cell 2. The second terminal of the second switch unit 135 is electrically connected to the control terminal of the seventh switch unit 114 through the third resistor 137. The control terminal of the third switch unit 135 is electrically connected to the third sub-signal terminal of the main board 3. The first terminal of the fourth switch unit 111 is electrically connected to the negative terminal of the battery cell 2 through the first resistor 114. The first terminal of the fourth switch unit 111 is electrically connected to the current signal receiving terminal of the first protection sub-circuit 121, the current signal receiving terminal of the second protection sub-circuit 122, and the input terminal of the analog-to-digital conversion circuit 1321. The control terminal of the fourth switch unit 111 is electrically connected to the discharge control terminal of the second protection sub-circuit 122. The first terminal of the fifth switch unit 112 is electrically connected to the second terminal of the fourth switch unit 111, and the control terminal of the fifth switch unit 112 is electrically connected to the charging control terminal of the second protection sub-circuit 122. The first terminal of the sixth switch unit 113 is electrically connected to the second terminal of the fifth switch unit 112, and the control terminal of the sixth switch unit 113 is electrically connected to the discharging control terminal of the first protection sub-circuit 121. The first terminal of the seventh switch unit 114 is electrically connected to the second terminal of the sixth switch unit 113, and the second terminal of the seventh switch unit 114 is used to electrically connect to the first terminal of the main board 3. The control terminal of the seventh switch unit 114 is electrically connected to the charging control terminal of the first protection sub-circuit 121. The first terminal of the first protection sub-circuit 121 is electrically connected to the positive terminal of the battery cell 2. The first terminal of the second protection sub-circuit 122 is electrically connected to the positive terminal of the battery cell 2. The first terminal of the unidirectional conduction unit 1322 is electrically connected to the output terminal of the analog-to-digital conversion circuit 1321, and the second terminal of the unidirectional conduction unit 1322 is electrically connected to the second terminal of the first switch unit 131. The negative terminal of cell 2 and the first terminal of motherboard 3 are both grounded.

[0115] In some exemplary embodiments, a battery protection board is provided, which includes any of the battery protection circuits described in the above embodiments. By employing the battery protection circuits described in the above embodiments, the power supply path from the battery cell to the motherboard can be promptly disconnected when the electronic device is powered off and the user identification card is not present. This avoids problems such as battery cell bulging caused by low battery voltage, and the long activation time or even inability to power on the electronic device after restarting. This reduces the power consumption of the electronic device and improves its reliability.

[0116] In some exemplary embodiments, a battery assembly is provided, which includes a battery cell and a battery protection board as described in the above embodiments. Because of the battery protection board in the above embodiments, when the electronic device is powered off and the user identification card is not present, the power supply path from the battery cell to the motherboard can be promptly disconnected. This avoids problems such as battery cell bulging caused by low battery voltage, and the electronic device requiring a long activation time to restart, or even failing to power on, thereby reducing the power consumption of the electronic device and improving its reliability.

[0117] In some exemplary embodiments, an electronic device is provided, which includes a motherboard and the battery assembly described in the above embodiments. By employing the battery assembly described in the above embodiments, the power supply path from the battery cell to the motherboard can be promptly disconnected when the electronic device is powered off and the user identification card is not present. This avoids problems such as battery cell bulging caused by low battery voltage, and the long activation time or even inability to power on the electronic device after restarting. This reduces the power consumption of the electronic device and improves its reliability.

[0118] Figure 10 This is a block diagram of an electronic device 1000 according to an exemplary embodiment.

[0119] Reference Figure 10 The electronic device 1000 may include one or more of the following components: a processing component 1002, a memory 1004, a power supply component 1006, a multimedia component 1008, an audio component 1010, an input / output (I / O) interface 1012, a sensor component 1014, and a communication component 1016.

[0120] Processing component 1002 typically controls the overall operation of electronic device 1000, such as operations associated with display, telephone calls, data communication, camera operation, and recording operations. Processing component 1002 may include one or more processors 1020 to execute instructions. Furthermore, processing component 1002 may include one or more modules to facilitate interaction between processing component 1002 and other components. For example, processing component 1002 may include a multimedia module to facilitate interaction between multimedia component 1008 and processing component 1002.

[0121] Memory 1004 is configured to store various types of data to support the operation of electronic device 1000. Examples of this data include instructions for any application or method operating on electronic device 1000, contact data, phonebook data, messages, pictures, videos, etc. Memory 1004 can be implemented by any type of volatile or non-volatile storage device 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 storage, flash memory, magnetic disk, or optical disk.

[0122] Power supply component 1006 provides power to various components of electronic device 1000. Power supply component 1006 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 1000.

[0123] Multimedia component 1008 includes a screen that provides an output interface between electronic device 1000 and 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 touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 1008 includes a front-facing camera and / or a rear-facing camera. When electronic device 1000 is in an operating mode, such as a shooting mode or video mode, the front-facing camera and / or rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0124] Audio component 1010 is configured to output and / or input audio signals. For example, audio component 1010 includes a microphone (MIC) configured to receive external audio signals when electronic device 1000 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 1004 or transmitted via communication component 1016. In some embodiments, audio component 1010 also includes a speaker for outputting audio signals.

[0125] I / O interface 1012 provides an interface between processing component 1002 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0126] Sensor assembly 1014 includes one or more sensors for providing state assessments of various aspects of electronic device 1000. For example, sensor assembly 1014 may detect the on / off state of electronic device 1000, the relative positioning of components such as the display and keypad of electronic device 1000, changes in position of electronic device 1000 or a component of electronic device 1000, the presence or absence of user contact with electronic device 1000, the orientation or acceleration / deceleration of electronic device 1000, and temperature changes of electronic device 1000. Sensor assembly 1014 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 1014 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 1014 may also include an accelerometer, gyroscope, magnetometer, pressure sensor, or temperature sensor.

[0127] Communication component 1016 is configured to facilitate wired or wireless communication between electronic device 1000 and other devices. Electronic device 1000 can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 1016 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 1016 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0128] In an exemplary embodiment, the electronic device 1000 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic units (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0129] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 1004 including instructions that can be executed by a processor 1020 of an electronic device 1000. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0130] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0131] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery protection circuit, characterized in that, The battery protection circuit includes: A switching circuit, wherein a first terminal of the switching circuit is used to electrically connect to the negative terminal of the battery cell, and a second terminal of the switching circuit is used to electrically connect to the first terminal of the motherboard; A protection circuit, wherein the first terminal of the protection circuit is electrically connected to both the positive terminal of the battery cell and the second terminal of the main board, and the second terminal of the protection circuit is electrically connected to the control terminal of the switching circuit; The control circuit has a first terminal electrically connected to the third terminal of the motherboard and a second terminal electrically connected to the control terminal of the switch circuit. The control circuit is used to turn the switch circuit on or off under a first signal issued by the motherboard. The first signal is used to reflect whether the user identification card is in place.

2. The battery protection circuit according to claim 1, characterized in that, The battery protection circuit also includes: The first resistor is electrically connected between the first terminal of the switching circuit and the negative terminal of the battery cell. The third terminal of the control circuit is electrically connected to the first terminal of the switching circuit. The control circuit is used to turn the switching circuit on or off under the first signal and the current of the battery cell.

3. The battery protection circuit according to claim 2, characterized in that, The control circuit includes: A first switching unit, wherein a first end of the first switching unit is electrically connected to the positive terminal of the battery cell, a second end of the first switching unit is electrically connected to the control terminal of the switching circuit, and the control terminal of the first switching unit is electrically connected to the third terminal of the motherboard; A signal conversion circuit, wherein a first terminal of the signal conversion circuit is electrically connected to a first terminal of the switching circuit, and a second terminal of the signal conversion circuit is electrically connected to a second terminal of the first switching unit, the signal conversion circuit being used to convert the current of the battery cell from an analog signal to a digital signal.

4. The battery protection circuit according to claim 3, characterized in that, The signal conversion circuit includes: An analog-to-digital converter circuit, wherein the input terminal of the analog-to-digital converter circuit is electrically connected to the first terminal of the switching circuit; A unidirectional conduction unit is provided, wherein the first end of the unidirectional conduction unit is electrically connected to the output end of the analog-to-digital conversion circuit, and the second end of the unidirectional conduction unit is electrically connected to the second end of the first switching unit. The unidirectional conduction unit is used to enable unidirectional conduction from the output end of the analog-to-digital conversion circuit to the control end of the switching circuit.

5. The battery protection circuit according to claim 3, characterized in that, The control circuit also includes: A voltage regulator circuit is electrically connected between the first terminal of the first switching unit and the positive terminal of the battery cell, and the voltage regulator circuit is used to stabilize the voltage of the battery cell.

6. The battery protection circuit according to claim 3, characterized in that, The third terminal of the motherboard includes a first sub-signal terminal, and at least one of a second sub-signal terminal and a third sub-signal terminal. The first sub-signal terminal is used to transmit the first signal, the second sub-signal terminal is used to transmit the second signal, and the third sub-signal terminal is used to transmit the third signal. The second signal is used to reflect whether a button is pressed, and the third signal is used to reflect whether a charging device is connected. The control circuit has multiple first terminals, each of which is electrically connected to one of the first sub-signal terminal, the second sub-signal terminal, and the third sub-signal terminal. The control circuit is used to turn the switching circuit on or off under at least one of the first signal, the second signal, and the third signal.

7. The battery protection circuit according to claim 6, characterized in that, The control circuit also includes: A second switching unit, wherein a first terminal of the second switching unit is electrically connected to the positive terminal of the battery cell, a second terminal of the second switching unit is electrically connected to the control terminal of the switching circuit, and the control terminal of the second switching unit is electrically connected to the second sub-signal terminal; and / or, The third switching unit has a first end that is electrically connected to the positive terminal of the battery cell, a second end that is electrically connected to the control terminal of the switching circuit, and a control terminal that is electrically connected to the third sub-signal terminal.

8. The battery protection circuit according to claim 1, characterized in that, The battery protection circuit also includes: A fuel gauge is electrically connected between the second terminal of the control circuit and the third terminal of the protection circuit. The second terminal of the control circuit is electrically connected to the control terminal of the switching circuit through the fuel gauge and the protection circuit. The fuel gauge is used to turn the switching circuit on or off under the control signal issued by the control circuit.

9. The battery protection circuit according to any one of claims 1 to 8, characterized in that, The protection circuit includes a first protection sub-circuit and a second protection sub-circuit; the switching circuit includes: The fourth switching unit has a first terminal for electrical connection to the negative terminal of the battery cell, and a control terminal for electrical connection to the discharge control terminal of the second protection sub-circuit. The fifth switching unit has its first terminal electrically connected to the second terminal of the fourth switching unit, and its control terminal electrically connected to the charging control terminal of the second protection sub-circuit. The sixth switching unit has its first terminal electrically connected to the second terminal of the fifth switching unit, and its control terminal electrically connected to the discharge control terminal of the first protection sub-circuit. The seventh switch unit has a first end electrically connected to the second end of the sixth switch unit, the second end of the seventh switch unit is used to electrically connect to the first end of the motherboard, and the control end of the seventh switch unit is electrically connected to the charging control end of the first protection sub-circuit.

10. The battery protection circuit according to claim 9, characterized in that, The second terminal of the control circuit is electrically connected to the control terminal of the seventh switch unit; or, the second terminal of the control circuit is electrically connected to the control terminals of the sixth switch unit and the seventh switch unit through the fuel gauge and the first protection sub-circuit in the battery protection circuit.

11. A battery protection board, characterized in that, The battery protection board includes the battery protection circuit as described in any one of claims 1 to 10.

12. A battery assembly, characterized in that, The battery assembly includes battery cells and a battery protection board as described in claim 11.

13. An electronic device, characterized in that, The electronic device includes a motherboard and a battery assembly as described in claim 12.

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