Battery control circuit, battery module and electronic equipment

Abstract

The invention discloses a battery control circuit, a battery module and electronic equipment, the battery control circuit comprises a discharge protection module and a protection locking module, the discharge protection module is used for collecting discharge parameters of a battery pack and triggering discharge protection when the discharge parameters are greater than a threshold value; a first end of the protection locking module is connected with a reference power supply and a voltage detection end of the discharge protection module, a second end of the protection locking module is connected with a reference potential, and a control end of the protection locking module is connected with a discharge control signal output end of the discharge protection module. A discharge protection signal is sent to the protection locking module through the discharge control signal output end, the protection locking module is switched on, the voltage of the first end of the protection locking module and the voltage of the voltage detection end of the discharge protection module is pulled to a reference potential, and the discharge protection module is locked in a state of stopping external output. Secondary damage to load end equipment and safety accidents are avoided, and safety is improved.

Description

Technical Field

[0001] The present invention relates to battery technology, and in particular to a battery control circuit, a battery module and an electronic device. Background Art

[0002] With the increasing popularity of portable electrical appliances, batteries are widely used as their energy providers.

[0003] During the use of the battery, it is inevitable that the load end will be abnormal, and under abnormal circumstances, the voltage, current, temperature and other uncontrolled states will occur. To address this problem, most batteries are currently equipped with a discharge protection circuit. When the voltage, current, temperature and other uncontrolled states occur during the battery discharge process, the discharge protection circuit is triggered and the battery stops outputting externally.

[0004] However, most of the existing discharge protection circuits will automatically restore the discharge function after the protection is triggered if the voltage, current and temperature return to normal. However, the abnormality at the load end may not be repaired at this time, so the discharge protection will be repeatedly triggered, which may easily cause secondary damage to the load-end equipment or cause safety accidents. Summary of the invention

[0005] The present invention provides a battery control circuit, a battery module and an electronic device, which can lock the discharge protection state when the discharge protection is triggered, thereby avoiding secondary damage to the load-end equipment and causing safety accidents, thereby improving safety.

[0006] In a first aspect, the present invention provides a battery control circuit, including a discharge protection module and a protection locking module;

[0007] The first end of the discharge protection module is connected to the first end of the battery pack, the second end of the discharge protection module is connected to the first input / output end of the battery control circuit, the second end of the battery pack is connected to the second input / output end of the battery control circuit, and the discharge protection module is used to collect the discharge parameters of the battery pack and trigger the discharge protection when the discharge parameters are greater than a threshold value, and stop external output;

[0008] The first end of the protection locking module is respectively connected to a reference power supply and a voltage detection end of the discharge protection module, the second end of the protection locking module is connected to a reference potential, the control end of the protection locking module is connected to a discharge control signal output end of the discharge protection module, and when the discharge protection is triggered, the discharge protection module sends a discharge protection signal to the protection locking module through the discharge control signal output end, turns on the protection locking module, and pulls the voltage of the first end of the protection locking module and the voltage detection end of the discharge protection module to the reference potential, thereby locking the discharge protection module in a state of stopping external output.

[0009] Optionally, the discharge protection module includes a control chip, a voltage acquisition unit and a charge and discharge switch unit;

[0010] The first end of the charge and discharge switch unit is connected to the first end of the battery pack, and the second end of the charge and discharge switch unit is connected to the first input / output end of the battery control circuit;

[0011] The power input terminal of the control chip is connected to the first terminal of the battery pack, the discharge control signal output terminal of the control chip is connected to the discharge control signal input terminal of the charge and discharge switch unit, and the charge control signal output terminal of the control chip is connected to the charge control signal input terminal of the charge and discharge switch unit;

[0012] The first end of the voltage acquisition unit is connected to the second end of the charge and discharge switch unit, and the second end of the voltage acquisition unit is connected to the voltage detection end of the control chip.

[0013] Optionally, the discharge protection module further includes a current acquisition unit, a first end of the current acquisition unit is connected to the current detection end of the control chip, and a second end of the current acquisition unit is connected to a reference potential.

[0014] Optionally, the voltage acquisition unit includes a first resistor, a first end of the first resistor is connected to a second end of the charge and discharge switch unit, and a second end of the first resistor is connected to a voltage detection end of the control chip.

[0015] Optionally, the charge and discharge switch unit includes a first electronic switch and a second electronic switch, the first electronic switch and the second electronic switch are connected in reverse series to form a bidirectional switch, the control end of the first electronic switch is connected to the discharge control signal output end of the control chip, and the control end of the second electronic switch is connected to the charging control signal output end of the control chip.

[0016] Optionally, the current acquisition unit includes a second resistor and a third resistor, the first end of the second resistor is connected to the current detection end of the control chip, the second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the reference potential.

[0017] Optionally, the protection locking module includes a first switch unit and a second switch unit, the first end of the first switch unit is respectively connected to a reference power supply and a voltage detection end of the discharge protection module, the second end of the first switch unit is connected to the first end of the second switch unit, the second end of the second switch unit is connected to a reference potential, the control end of the first switch unit is connected to a discharge control signal output end of the discharge protection module, and the control end of the second switch unit is connected to a reference potential.

[0018] Optionally, the first switch unit includes a third electronic switch and a fourth resistor, the first end of the third electronic switch is respectively connected to a reference power supply and a voltage detection end of the discharge protection module, the second end of the third electronic switch is connected to the first end of the second switch unit, the control end of the third electronic switch is connected to the discharge control signal output end of the discharge protection module, the first end of the fourth resistor is connected to the control end of the third electronic switch, and the second end of the fourth resistor is connected to the second end of the third electronic switch.

[0019] Optionally, the second switch unit includes a fourth electronic switch and a fifth resistor, the first end of the fourth electronic switch is connected to the second end of the first switch unit, the second end of the fourth electronic switch is connected to a reference potential, the first end of the fifth resistor is connected to the control end of the fourth electronic switch, and the second end of the fifth resistor is connected to the reference potential.

[0020] Optionally, the protection locking module also includes an activation unit, a first end of the activation unit is connected to the control end of the first switch unit, a second end of the activation unit is connected to a reference potential, and the control end of the activation unit is used to receive an activation signal; after the discharge protection module is locked, if the control end of the activation unit receives an activation signal, the activation unit is turned on, so that the voltage at the discharge control signal output end of the discharge protection module is pulled to the reference potential, and the first switch unit is turned off, so that the voltage at the first end of the protection locking module and the voltage detection end of the discharge protection module are restored to the voltage of the reference power supply, and the discharge protection module is unlocked and restored to external output.

[0021] The activation unit includes a fifth electronic switch and a sixth resistor, the first end of the fifth electronic switch is connected to the control end of the first switch unit, the second end of the fifth electronic switch is connected to the reference potential, the control end of the fifth electronic switch is used to receive an activation signal, the first end of the sixth resistor is connected to the second end of the fifth electronic switch, and the second end of the sixth resistor is connected to the control end of the fifth electronic switch.

[0022] Optionally, the battery control circuit also includes an activation signal generating module, a first input end of the activation signal generating module is connected to a first input / output end of the battery control circuit, a second input end of the activation signal generating module is connected to a second input / output end of the battery control circuit, an output end of the activation signal generating module is connected to a control end of the activation unit, and the control end of the activation signal generating module is connected to a discharge control signal output end of the discharge protection module. When the discharge protection is triggered, the discharge protection module sends a discharge protection signal to the activation signal generating module through the discharge control signal output end, enabling the activation signal generating module and causing the activation signal generating module to enter a standby state. When the first input / output end and the second input / output end of the battery control circuit are connected to a charging voltage, the activation signal generating module generates the activation signal.

[0023] Optionally, the activation signal generating module includes a voltage conversion chip, a power input terminal of the voltage conversion chip is connected to the first input / output terminal of the battery control circuit, a ground terminal of the voltage conversion chip is connected to the second input / output terminal of the battery control circuit, an output terminal of the voltage conversion chip is connected to the control terminal of the activation unit, and an enable signal terminal of the voltage conversion chip is connected to the discharge control signal output terminal of the discharge protection module.

[0024] In a second aspect, the present invention further provides a battery module, comprising a battery pack and a battery control circuit as provided in the first aspect of the present invention.

[0025] In a third aspect, the present invention further provides an electronic device, comprising the battery module provided in the second aspect of the present invention.

[0026] The battery control circuit provided by the present invention comprises a discharge protection module and a protection locking module. The first end of the discharge protection module is connected to the first end of the battery pack, the second end of the discharge protection module is connected to the first input / output end of the battery control circuit, the second end of the battery pack is connected to the second input / output end of the battery control circuit, the discharge protection module is used to collect the discharge parameter of the battery pack, and trigger the discharge protection when the discharge parameter is greater than a threshold value, and stop external output. The first end of the protection locking module is respectively connected to a reference power supply and a voltage detection end of the discharge protection module, the second end of the protection locking module is connected to a reference potential, and the control end of the protection locking module is connected to a discharge control signal output end of the discharge protection module. When the discharge protection is triggered, the discharge protection module sends a discharge protection signal to the protection locking module through the discharge control signal output end, turns on the protection locking module, so that the voltage of the first end of the protection locking module and the voltage detection end of the discharge protection module are pulled to the reference potential, and the discharge protection module is locked in a state of stopping external output. Even if the discharge parameter returns to normal, the battery pack cannot be externally output, thereby avoiding secondary damage to load-end equipment and causing safety accidents, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0028] Figure 1 A structural block diagram of a battery control circuit provided by the present invention;

[0029] Figure 2 A circuit diagram of a battery control circuit provided by the present invention;

[0030] Figure 3 An exploded diagram of a battery module provided by the present invention. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.

[0034] Figure 1 A structural block diagram of a battery control circuit provided by the present invention, such as Figure 1 As shown, the battery control circuit 100 includes a discharge protection module 110 and a protection locking module 120 .

[0035] The first end of the discharge protection module 110 is connected to the first end B+ of the battery pack 200, the second end of the discharge protection module 110 is connected to the first input / output end P+ of the battery control circuit 100, and the second end B- of the battery pack 200 is connected to the second input / output end P- of the battery control circuit. The discharge protection module 110 is used to collect the discharge parameters of the battery pack 200, and trigger the discharge protection when the discharge parameters are greater than the threshold value, and stop the external output. Exemplarily, the discharge parameters may include the output voltage, output current and discharge temperature of the battery pack 200 during the discharge process, which is not limited in the embodiment of the present invention.

[0036] The first end of the protection locking module 120 is respectively connected to the reference power supply Vref and the voltage detection terminal VMP of the discharge protection module 110, and the second end of the protection locking module 120 is connected to the reference potential. Exemplarily, the reference potential is 0 potential, that is, the second end of the protection locking module 120 is grounded (since the second input / output terminal P- of the battery control circuit is usually grounded, in an embodiment of the present invention, the second end of the protection locking module 120 is connected to the second input / output terminal P- of the battery control circuit), and the control end of the protection locking module 120 is connected to the discharge control signal output terminal DOP of the discharge protection module 110.

[0037] During the discharge process of the battery pack 200, when the discharge protection is triggered by overvoltage, undervoltage, overcurrent or overtemperature, the discharge protection module 110 cuts off the discharge circuit of the battery pack 200 and stops external output. At the same time, the discharge protection module 110 sends a discharge protection signal to the protection locking module 120 through the discharge control signal output terminal DOP. The protection locking module 120 is turned on in response to the discharge protection signal, so that the voltage of the first end of the protection locking module 120 and the voltage detection terminal VMP of the discharge protection module 110 are pulled to the reference potential (exemplarily, in the embodiment of the present invention, the reference potential is 0 potential or low potential). After the voltage of the voltage detection terminal VMP of the discharge protection module 110 is pulled to the reference potential, the discharge protection module 110 is locked in a state of stopping external output. Even if the discharge parameters return to normal, the battery pack 200 cannot output externally, avoiding secondary damage to the load-end equipment and causing safety accidents, thereby improving safety.

[0038] The battery control circuit provided by the present invention comprises a discharge protection module and a protection locking module. The first end of the discharge protection module is connected to the first end of the battery pack, the second end of the discharge protection module is connected to the first input / output end of the battery control circuit, the second end of the battery pack is connected to the second input / output end of the battery control circuit, the discharge protection module is used to collect the discharge parameter of the battery pack, and trigger the discharge protection when the discharge parameter is greater than a threshold value, and stop external output. The first end of the protection locking module is respectively connected to a reference power supply and a voltage detection end of the discharge protection module, the second end of the protection locking module is connected to a reference potential, and the control end of the protection locking module is connected to a discharge control signal output end of the discharge protection module. When the discharge protection is triggered, the discharge protection module sends a discharge protection signal to the protection locking module through the discharge control signal output end, turns on the protection locking module, so that the voltage of the first end of the protection locking module and the voltage detection end of the discharge protection module are pulled to the reference potential, and the discharge protection module is locked in a state of stopping external output. Even if the discharge parameter returns to normal, the battery pack cannot be externally output, thereby avoiding secondary damage to load-end equipment and causing safety accidents, thereby improving safety.

[0039] Figure 2A circuit diagram of a battery control circuit provided by the present invention is provided. This embodiment describes the modules in the above-mentioned embodiment in detail. Figure 2 As shown, the discharge protection module 110 includes a control chip U1 , a voltage acquisition unit 111 and a charge and discharge switch unit 112 .

[0040] A first end of the charge and discharge switch unit 112 is connected to a first end B+ of the battery pack 200 , and a second end of the charge and discharge switch unit 112 is connected to a first input / output end P+ of the battery control circuit.

[0041] The power input terminal VDD of the control chip U1 is connected to the first terminal B+ of the battery pack 200, the discharge control signal output terminal DOP of the control chip U1 is connected to the discharge control signal input terminal of the charge and discharge switch unit 112, and the charge control signal output terminal COP of the control chip U1 is connected to the charge control signal input terminal of the charge and discharge switch unit 112.

[0042] A first end of the voltage acquisition unit 111 is connected to a second end of the charge-discharge switch unit 112 , and a second end of the voltage acquisition unit 111 is connected to a voltage detection end VMP of the control chip U1 .

[0043] Exemplarily, the voltage acquisition unit 111 includes a first resistor R1 , a first end of the first resistor is connected to a second end of the charge and discharge switch unit 112 , and a second end of the first resistor R1 is connected to a voltage detection end VMP of the control chip U1 .

[0044] Exemplarily, during the discharge process of the battery pack 200, when the voltage collected by the voltage collection unit 111 is within the normal range, the control chip U1 sends a discharge control signal to the charge and discharge switch unit 112 through the discharge control signal output terminal DOP, controls the charge and discharge switch unit 112 to operate, the discharge circuit is turned on, and the battery pack 200 discharges normally; when the collected voltage is higher than the discharge protection voltage, or lower than the undervoltage protection voltage, the control chip U1 sends a discharge protection signal to the charge and discharge switch unit 112 through the discharge control signal output terminal DOP, controls the charge and discharge switch unit 112 to operate, and the discharge circuit is disconnected. During the charging process of the battery pack 200, when the collected voltage is higher than the charging protection voltage, the control chip U1 sends a charging protection signal to the charge and discharge switch unit 112 through the charging control signal output terminal COP, controls the charge and discharge switch unit 112 to operate, and the charging circuit is disconnected.

[0045] In some embodiments of the present invention, Figure 2As shown, the charge and discharge switch unit 112 includes a first electronic switch Q1 and a second electronic switch Q2. The first electronic switch Q1 and the second electronic switch Q2 are connected in reverse series to form a bidirectional switch. The control end of the first electronic switch Q1 is connected to the discharge control signal output end DOP of the control chip U1, and the control end of the second electronic switch Q2 is connected to the charge control signal output end COP of the control chip U1.

[0046] Exemplarily, the first electronic switch Q1 and the second electronic switch Q2 are both P-type metal oxide thin film transistors (PMOS). During the discharge process of the battery pack 200, when the collected discharge parameters are within the normal range, the discharge control signal output terminal DOP of the control chip U1 outputs a discharge control signal (low level signal), and the charging control signal output terminal COP outputs a charging control signal (low level signal). The first electronic switch Q1 and the second electronic switch Q2 are both turned on, and the battery pack 200 outputs normally to the outside; when the discharge protection is triggered, the control chip U1 sends a discharge protection signal (high level signal) to the first electronic switch Q1 through the discharge control signal output terminal DOP, the first electronic switch Q1 is disconnected, and the discharge circuit is disconnected; during the charging process of the battery pack 200, when the charging protection is triggered, the control chip U1 sends a charging protection signal (high level signal) to the second electronic switch Q2 through the charging control signal output terminal COP, the second electronic switch Q2 is disconnected, and the charging circuit is disconnected.

[0047] In some embodiments of the present invention, Figure 2 As shown, the discharge protection module 110 also includes a current acquisition unit 113, a first end of the current acquisition unit 113 is connected to the current detection terminal VINI of the control chip U1, and a second end of the current acquisition unit 113 is connected to a reference potential (exemplarily, the reference potential is 0 potential, and the second end of the current acquisition unit 113 is grounded). Exemplarily, after the voltage collected by the voltage acquisition unit 111 is processed by the internal circuit of the control chip U1, a voltage is output from the current detection terminal VINI of the control chip U1, and the current acquisition unit 113 is turned on. The internal circuit of the control chip U1 calculates the discharge current of the battery pack 200 through the voltage difference between the current detection terminal VINI and the reference voltage terminal VSS (usually the reference voltage terminal VSS is connected to the second terminal B- of the battery pack 200). When the discharge current is higher than the discharge protection current, the control chip U1 sends a discharge protection signal to the charge and discharge switch unit 112 through the discharge control signal output terminal DOP, controls the charge and discharge switch unit 112 to operate, and the discharge circuit is disconnected.

[0048] In some embodiments of the present invention, Figure 2As shown, the current acquisition unit 113 includes a second resistor R2 and a third resistor R3, the first end of the second resistor R2 is connected to the current detection terminal VINI of the control chip U1, the second end of the second resistor R2 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the reference potential (ground).

[0049] In some embodiments of the present invention, Figure 2 As shown, the protection locking module 120 includes a first switch unit 121 and a second switch unit 122, the first end of the first switch unit 121 is respectively connected to the reference power supply Vref and the voltage detection end VMP of the discharge protection module, the second end of the first switch unit 121 is connected to the first end of the second switch unit 122, the second end of the second switch unit 122 is connected to the reference potential (ground), the control end of the first switch unit 121 is connected to the discharge control signal output end DOP of the discharge protection module 110 (that is, the discharge control signal output end DOP of the control chip U1), and the control end of the second switch unit 122 is connected to the reference potential.

[0050] Exemplarily, after triggering the discharge protection, the discharge protection module 110 sends a discharge protection signal through the discharge control signal output terminal DOP, so that the first switch unit 121 is turned on, and then the second switch unit 122 is turned on, and the voltage of the first end of the protection locking module 120 and the voltage detection terminal VMP of the discharge protection module 110 are pulled to the reference potential (0 potential). Since the voltage of the control chip U1 at the voltage detection terminal VMP is lower than half of the VDS voltage (i.e., the voltage difference between the power input terminal VDD and the reference voltage terminal VSS), the control chip U1 cannot work, and the first electronic switch Q1 and the second electronic switch Q2 are both turned off. Therefore, the battery pack 200 cannot discharge to the outside, and the discharge protection module 110 is locked in a state of stopping external output.

[0051] In some embodiments of the present invention, Figure 2 As shown, the first switch unit 121 includes a third electronic switch Q3 and a fourth resistor R4, a first end of the third electronic switch Q3 is respectively connected to a reference power supply Vref and a voltage detection end VMP of the discharge protection module 110, a second end of the third electronic switch Q3 is connected to a first end of the second switch unit 122, a control end of the third electronic switch Q3 is connected to a discharge control signal output end DOP of the discharge protection module 110, a first end of the fourth resistor R4 is connected to the control end of the third electronic switch Q3, and a second end of the fourth resistor R4 is connected to a second end of the third electronic switch Q3.

[0052] like Figure 2As shown, the second switch unit 122 includes a fourth electronic switch Q4 and a fifth resistor R5, a first end of the fourth electronic switch Q4 is connected to the second end of the first switch unit 121 (the second end of the third electronic switch Q3), a second end of the fourth electronic switch Q4 is connected to a reference potential (exemplarily, connected to the second input / output terminal P- of the battery control circuit), a first end of the fifth resistor R5 is connected to the control end of the fourth electronic switch Q4, and a second end of the fifth resistor R5 is connected to the reference potential.

[0053] Exemplarily, the third electronic switch Q3 is an NMOS tube, and the fourth electronic switch Q4 is a PMOS tube. After the discharge protection is triggered, the discharge protection module 110 sends a discharge protection signal (high level signal) through the discharge control signal output terminal DOP, so that the third electronic switch Q3 is turned on, and then the fourth electronic switch Q4 is turned on, and the voltage of the first end of the protection locking module 120 and the voltage detection terminal VMP of the discharge protection module 110 are pulled to the reference potential (0 potential). Since the voltage of the control chip U1 at the voltage detection terminal VMP is lower than half of the VDS voltage (that is, the voltage difference between the power input terminal VDD and the reference voltage terminal VSS), the control chip U1 cannot work, and the first electronic switch Q1 and the second electronic switch Q2 are both turned off. Therefore, the battery pack 200 cannot discharge to the outside, and the discharge protection module 110 is locked in a state of stopping external output.

[0054] In some embodiments of the present invention, Figure 2 As shown, the protection locking module 120 also includes an activation unit 123, a first end of the activation unit 123 is connected to the control end of the first switch unit 121 (the control end of the third electronic switch Q3), a second end of the activation unit 123 is connected to the reference potential (connected to the control end of the fourth electronic switch Q4), and the control end ACT of the activation unit 123 is used to receive an activation signal.

[0055] Exemplarily, after the discharge protection module 110 is locked, if the control terminal ACT of the activation unit 123 receives an activation signal, the activation unit 123 is turned on, so that the voltage of the discharge control signal output terminal DOP of the discharge protection module 110 is pulled to the reference potential (i.e., low potential), and the first switch unit 121 is turned off, so that the voltage of the first end of the protection locking module 120 and the voltage detection terminal VMP of the discharge protection module 110 is restored to the voltage of the reference power supply Vref (i.e., high potential), and the discharge protection module 110 is unlocked and restored to external output.

[0056] In some embodiments of the present invention, Figure 2As shown, the activation unit 123 includes a fifth electronic switch Q5 and a sixth resistor R6, a first end of the fifth electronic switch Q5 is connected to the control end of the first switch unit 121 (the control end of the third electronic switch Q3), a second end of the fifth electronic switch Q5 is connected to a reference potential (connected to the control end of the fourth electronic switch Q4), the control end of the fifth electronic switch Q5 (that is, the control end ACT of the activation unit 123) is used to receive an activation signal, a first end of the sixth resistor R6 is connected to the second end of the fifth electronic switch Q5, and a second end of the sixth resistor R6 is connected to the control end of the fifth electronic switch Q5.

[0057] Exemplarily, the fifth electronic switch Q5 is an NMOS tube. After the discharge protection module 110 is locked, if the control terminal ACT of the fifth electronic switch Q5 receives an activation signal (high level signal), the fifth electronic switch Q5 is turned on, so that the voltage of the discharge control signal output terminal DOP of the discharge protection module 110 is pulled to the reference potential (i.e., low potential), and the third electronic switch Q3 is turned off, so that the voltage of the first end of the protection locking module 120 and the voltage detection terminal VMP of the discharge protection module 110 is restored to the voltage of the reference power supply Vref (i.e., high potential), the discharge protection module 110 is unlocked, and the control chip U1 internally pulls down the voltage of the discharge control signal output terminal DOP to a low potential, the first electronic switch Q1 is turned on, and the battery control circuit resumes external output.

[0058] In some embodiments of the present invention, Figure 2 As shown, the battery control circuit also includes an activation signal generating module 130, a first input terminal of the activation signal generating module 130 is connected to a first input / output terminal P+ of the battery control circuit, a second input terminal of the activation signal generating module 130 is connected to a second input / output terminal P- of the battery control circuit, an output terminal of the activation signal generating module 130 is connected to a control terminal ACT of the activation unit 123 (the control terminal of the fifth electronic switch Q5), and a control terminal of the activation signal generating module 130 is connected to a discharge control signal output terminal DOP of the discharge protection module 110.

[0059] Exemplarily, when the discharge protection is triggered, the discharge protection module 110 sends a discharge protection signal to the activation signal generation module 130 through the discharge control signal output terminal DOP, enabling the activation signal generation module 130, and causing the activation signal generation module 130 to enter a standby state. When the first input / output terminal and the second input / output terminal of the battery control circuit are connected to a charging voltage (i.e., connected to an external charger for charging), the activation signal generation module 130 generates an activation signal. When the control terminal ACT of the activation unit 123 receives the activation signal, the activation unit 123 is turned on, so that the voltage of the discharge control signal output terminal DOP of the discharge protection module 110 is pulled to a reference potential (i.e., a low potential), and the first switch unit 121 is turned off, so that the voltage of the first terminal of the protection locking module 120 and the voltage detection terminal VMP of the discharge protection module 110 is restored to the voltage of the reference power supply Vref (i.e., a high potential), and the discharge protection module 110 is unlocked and resumes external output.

[0060] In some embodiments of the present invention, Figure 2 As shown, the activation signal generating module 130 includes a voltage conversion chip U2, which can be a linear DC regulator. The power input terminal VIN of the voltage conversion chip U2 is connected to the first input / output terminal P+ of the battery control circuit, the ground terminal GND of the voltage conversion chip U2 is connected to the second input / output terminal P- of the battery control circuit, the output terminal VOUT of the voltage conversion chip U2 is connected to the control terminal ACT of the activation unit 123, and the enable signal terminal EN of the voltage conversion chip U2 is connected to the discharge control signal output terminal DOP of the discharge protection module 110.

[0061] When the discharge protection is triggered, the discharge protection module 110 sends a discharge protection signal (high level signal) to the voltage conversion chip U2 through the discharge control signal output terminal DOP, enables the voltage conversion chip U2, and puts the voltage conversion chip U2 into a standby state. When the first input / output terminal and the second input / output terminal of the battery control circuit are connected to the charging voltage (i.e., connected to an external charger for charging), the voltage conversion chip U2 converts the charging voltage into an activation signal (exemplarily, the activation signal in the present invention is a 5V high level signal) and outputs it. When the control terminal ACT of the activation unit 123 receives the activation signal, the activation unit 123 is turned on, so that the voltage of the discharge control signal output terminal DOP of the discharge protection module 110 is pulled to the reference potential (i.e., low potential), and the first switch unit 121 is turned off, so that the voltage of the first terminal of the protection locking module 120 and the voltage detection terminal VMP of the discharge protection module 110 is restored to the voltage of the reference power supply Vref (i.e., high potential), and the discharge protection module 110 is unlocked and resumes external output.

[0062] For example, Figure 2As shown, the discharge control signal output terminal DOP of the control chip U1 is connected to the control terminal of the first electronic switch Q1 through the current limiting resistor R7, and the charge control signal output terminal COP of the control chip U1 is connected to the control terminal of the second electronic switch Q2 through the current limiting resistor R8.

[0063] For example, Figure 2 As shown, the second end of the second electronic switch Q2 is also connected to the filter capacitor C1 and the filter capacitor C2, the first end of the filter capacitor C1 is connected to the second end of the second electronic switch Q2, the second end of the filter capacitor C1 is connected to the first end of the filter capacitor C2, and the second end of the filter capacitor C2 is connected to the second input / output terminal P- of the battery control circuit.

[0064] For example, Figure 2 As shown, the second end of the second electronic switch Q2 is also connected to a bidirectional transient suppression diode TVS and a bidirectional voltage regulator DT, the first end of the bidirectional transient suppression diode TVS is connected to the second end of the second electronic switch Q2, the second end of the bidirectional transient suppression diode TVS is connected to the second input / output terminal P- of the battery control circuit, the first end of the bidirectional voltage regulator DT is connected to the second end of the second electronic switch Q2, and the second end of the bidirectional voltage regulator DT is connected to the second input / output terminal P- of the battery control circuit. The bidirectional transient suppression diode TVS and the bidirectional voltage regulator DT can absorb instantaneous surge pulse voltage and play a protective role during the charging and discharging process.

[0065] For example, Figure 2 As shown, the discharge FET control terminal CTLD and the charge FET control terminal CTLC of the control chip U1 are connected to the reference potential VSS through resistors R8 and R9 respectively. The over-discharge delay detection terminal CDT is connected to the resistor R10 through the capacitor C3, and the resistor R10 is connected to the second terminal B- of the battery pack 200. The over-charge delay detection terminal CCT is connected to the resistor R10 through the capacitor C4. The discharge over-current delay detection terminal CIT is connected to the resistor R10 through the capacitor C5. The battery switching terminal SEL of the control chip U1 is connected to the resistor R10 through the resistor R11.

[0066] For example, Figure 2As shown, the battery negative electrode connection terminal VC1 of the control chip U1 is connected to the negative electrode of the battery B1 through the resistor R12, the battery negative electrode connection terminal VC2 of the control chip U1 is connected to the negative electrode of the battery B2 through the resistor R13, the battery negative electrode connection terminal VC3 of the control chip U1 is connected to the negative electrode of the battery B3 through the resistor R14, and the battery negative electrode connection terminal VC4 of the control chip U1 is connected to the negative electrode of the battery B3 through the resistor R15. The battery negative electrode connection terminal VC1 is also connected to the first end of the capacitor C6, the second end of the capacitor C6 is connected to the first end of the capacitor C7, the second end of the capacitor C7 is connected to the resistor R10, the battery negative electrode connection terminal VC2 is connected to the first end of the capacitor C8, the second end of the capacitor C8 is connected to the first end of the capacitor C7, the battery negative electrode connection terminal VC3 is connected to the first end of the capacitor C9, and the second end of the capacitor C9 is connected to the first end of the capacitor C7.

[0067] For example, Figure 2 As shown, capacitors C11, C12 and C13 are connected in parallel between the power input terminal VIN and the ground terminal GND of the voltage conversion chip U2, and the capacitors C11, C12 and C13 play a role in filtering and stabilizing voltage.

[0068] For example, Figure 2 As shown, the output terminal VOUT of the voltage conversion chip U2 is also connected in parallel with capacitors C14, C15 and C16, which play the role of filtering and voltage stabilization.

[0069] For example, Figure 2 As shown, capacitors C17 and C18 are connected in series between the first end of the first electronic switch Q1 and the second end of the second electronic switch Q2, and capacitors C17 and C18 play a role in protecting the first end of the first electronic switch Q1 and the second electronic switch Q2.

[0070] The present invention also provides a battery module. Figure 3 An exploded diagram of a battery module provided by the present invention, such as Figure 3As shown, the battery module includes a battery cell 1, a bracket 2 and a protection plate 3. The battery cell 1 is also a battery pack, including multiple single cells. The battery cell 1 is fixed on the bracket 2, and the bracket 2 is fixed to the electronic device. A first encapsulation layer 4 is provided on the side of the bracket 2 away from the battery cell 1, and a second encapsulation layer 5 is provided on the side of the battery cell 1 away from the bracket 2. The first encapsulation layer 4 and the second encapsulation layer 5 wrap the battery cell 1 to play a protective isolation role. The protection plate 3 is arranged at the end of the battery cell 1. The protection plate 3 is a circuit board, on which the battery control circuit provided by any of the aforementioned embodiments of the present invention is arranged. The protection plate 3 leads to a terminal line 31, and the terminal line 31 provides a first input / output terminal P+ and a second input / output terminal P- of the battery control circuit. An insulating layer 32 (such as barley paper) is provided on the surface of the protection plate 3, which plays an insulating role and protects the electronic components on the protection plate 3.

[0071] The present invention further provides an electronic device, which includes the battery module provided by the aforementioned embodiment of the present invention.

[0072] In the description of this article, it is necessary to understand that the terms "up", "down", "left", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0073] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0074] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0075] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A battery control circuit, characterized in that: It includes a discharge protection module and a protection locking module; The first end of the discharge protection module is connected to the first end of the battery pack, the second end of the discharge protection module is connected to the first input / output end of the battery control circuit, the second end of the battery pack is connected to the second input / output end of the battery control circuit, and the discharge protection module is used to collect the discharge parameters of the battery pack and trigger the discharge protection when the discharge parameters are greater than a threshold value, and stop external output; The first end of the protection locking module is respectively connected to a reference power supply and a voltage detection end of the discharge protection module, the second end of the protection locking module is connected to a reference potential, the control end of the protection locking module is connected to a discharge control signal output end of the discharge protection module, and when the discharge protection is triggered, the discharge protection module sends a discharge protection signal to the protection locking module through the discharge control signal output end, turns on the protection locking module, and pulls the voltage of the first end of the protection locking module and the voltage detection end of the discharge protection module to the reference potential, thereby locking the discharge protection module in a state of stopping external output.

2. The battery control circuit according to claim 1, characterized in that: The discharge protection module includes a control chip, a voltage acquisition unit and a charge and discharge switch unit; The first end of the charge and discharge switch unit is connected to the first end of the battery pack, and the second end of the charge and discharge switch unit is connected to the first input / output end of the battery control circuit; The power input terminal of the control chip is connected to the first terminal of the battery pack, the discharge control signal output terminal of the control chip is connected to the discharge control signal input terminal of the charge and discharge switch unit, and the charge control signal output terminal of the control chip is connected to the charge control signal input terminal of the charge and discharge switch unit; The first end of the voltage acquisition unit is connected to the second end of the charge and discharge switch unit, and the second end of the voltage acquisition unit is connected to the voltage detection end of the control chip.

3. The battery control circuit according to claim 2, characterized in that: The discharge protection module further includes a current acquisition unit, a first end of the current acquisition unit is connected to the current detection end of the control chip, and a second end of the current acquisition unit is connected to a reference potential.

4. The battery control circuit according to claim 2, characterized in that: The voltage acquisition unit includes a first resistor, a first end of the first resistor is connected to a second end of the charge and discharge switch unit, and a second end of the first resistor is connected to a voltage detection end of the control chip.

5. The battery control circuit according to claim 2, characterized in that: The charge and discharge switch unit includes a first electronic switch and a second electronic switch, the first electronic switch and the second electronic switch are connected in reverse series to form a bidirectional switch, the control end of the first electronic switch is connected to the discharge control signal output end of the control chip, and the control end of the second electronic switch is connected to the charge control signal output end of the control chip.

6. The battery control circuit according to claim 3, characterized in that: The current acquisition unit includes a second resistor and a third resistor, the first end of the second resistor is connected to the current detection end of the control chip, the second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the reference potential.

7. The battery control circuit according to any one of claims 1 to 6, characterized in that: The protection locking module includes a first switch unit and a second switch unit, the first end of the first switch unit is respectively connected to a reference power supply and a voltage detection end of the discharge protection module, the second end of the first switch unit is connected to the first end of the second switch unit, the second end of the second switch unit is connected to a reference potential, the control end of the first switch unit is connected to a discharge control signal output end of the discharge protection module, and the control end of the second switch unit is connected to a reference potential.

8. The battery control circuit according to claim 7, characterized in that: The first switch unit includes a third electronic switch and a fourth resistor, a first end of the third electronic switch is respectively connected to a reference power supply and a voltage detection end of the discharge protection module, a second end of the third electronic switch is connected to a first end of the second switch unit, a control end of the third electronic switch is connected to a discharge control signal output end of the discharge protection module, a first end of the fourth resistor is connected to the control end of the third electronic switch, and a second end of the fourth resistor is connected to a second end of the third electronic switch.

9. The battery control circuit according to claim 7, characterized in that: The second switch unit includes a fourth electronic switch and a fifth resistor, the first end of the fourth electronic switch is connected to the second end of the first switch unit, the second end of the fourth electronic switch is connected to a reference potential, the first end of the fifth resistor is connected to the control end of the fourth electronic switch, and the second end of the fifth resistor is connected to the reference potential.

10. The battery control circuit according to claim 7, characterized in that: The protection locking module further comprises an activation unit, a first end of the activation unit is connected to the control end of the first switch unit, a second end of the activation unit is connected to a reference potential, and the control end of the activation unit is used to receive an activation signal; After the discharge protection module is locked, if the control end of the activation unit receives an activation signal, the activation unit is turned on, so that the voltage of the discharge control signal output end of the discharge protection module is pulled to the reference potential, and the first switch unit is turned off, so that the voltage of the first end of the protection locking module and the voltage detection end of the discharge protection module are restored to the voltage of the reference power supply, and the discharge protection module is unlocked and restored to external output.

11. The battery control circuit according to claim 10, characterized in that: The activation unit includes a fifth electronic switch and a sixth resistor, the first end of the fifth electronic switch is connected to the control end of the first switch unit, the second end of the fifth electronic switch is connected to the reference potential, the control end of the fifth electronic switch is used to receive an activation signal, the first end of the sixth resistor is connected to the second end of the fifth electronic switch, and the second end of the sixth resistor is connected to the control end of the fifth electronic switch.

12. The battery control circuit according to claim 10, characterized in that: The battery control circuit also includes an activation signal generating module, a first input end of the activation signal generating module is connected to a first input / output end of the battery control circuit, a second input end of the activation signal generating module is connected to a second input / output end of the battery control circuit, an output end of the activation signal generating module is connected to a control end of the activation unit, and a control end of the activation signal generating module is connected to a discharge control signal output end of the discharge protection module. When the discharge protection is triggered, the discharge protection module sends a discharge protection signal to the activation signal generating module through the discharge control signal output end, enabling the activation signal generating module and causing the activation signal generating module to enter a standby state. When the first input / output end and the second input / output end of the battery control circuit are connected to a charging voltage, the activation signal generating module generates the activation signal.

13. The battery control circuit according to claim 12, characterized in that: The activation signal generating module includes a voltage conversion chip, a power input terminal of the voltage conversion chip is connected to a first input / output terminal of the battery control circuit, a ground terminal of the voltage conversion chip is connected to a second input / output terminal of the battery control circuit, an output terminal of the voltage conversion chip is connected to a control terminal of the activation unit, and an enable signal terminal of the voltage conversion chip is connected to a discharge control signal output terminal of the discharge protection module.

14. A battery module, characterized in that: It comprises a battery pack and a battery control circuit as described in any one of claims 1-13.

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

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