CN115693806A - Battery protection circuit and battery pack - Google Patents

Abstract

The invention belongs to the technical field of batteries, in particular to a battery protection circuit and a battery pack. The battery protection circuit includes a recoverable circuit breaker control circuit and a first controller; the recoverable circuit breaker control circuit includes an active switch connected to the first controller and a recoverable circuit breaker connected to battery cells; the first controller is also used to When it is detected that the temperature of the battery cell is greater than or equal to the preset battery temperature, or the current of the battery cell is greater than or equal to the first preset current, or the voltage of the battery cell is greater than or equal to the first preset voltage, the active switch is controlled to conduct To increase the operating temperature of the recoverable circuit breaker to the preset operating temperature, so that the recoverable circuit breaker is turned off. In the present invention, the recoverable circuit breaker control circuit can be used repeatedly after it is activated, and the battery protection circuit is used as a secondary protection circuit or a tertiary protection circuit for battery cells.

Description

A battery protection circuit and battery pack

technical field

The invention belongs to the technical field of batteries, in particular to a battery protection circuit and a battery pack.

Background technique

Secondary protection devices such as mobile phone batteries, notebook batteries, and tablet batteries generally use solutions such as positive temperature coefficient resistors PTC and thermal fuses. Among them, the positive temperature coefficient resistor PTC is a high molecular polymer material, and its internal resistance cannot be completely restored after each action. At the same time, its material is affected by the temperature, humidity, corrosive gas, etc. After a period of time, its internal resistance will increase, resulting in a decrease in the usable capacity of the battery and an increase in the loss in the direction of the battery itself. In addition, after the thermal fuse is activated, it cannot be restored to use, thus causing a waste of resources and further causing scrapping of the terminal.

Contents of the invention

The invention solves the technical problems of non-reusability after the secondary protection device of the battery exists in the prior art, and provides a battery protection circuit and a battery pack.

An embodiment of the present invention provides a battery protection circuit, including a recoverable circuit breaker control circuit and a first controller; the recoverable circuit breaker control circuit includes an active switch and a recoverable circuit breaker; one end of the active switch is connected to the A first controller, the other end of the active switch is connected to the resettable circuit breaker and the external device, and the end of the resettable circuit breaker away from the external device is connected to the battery cell;

The first controller is used to detect the temperature, current and voltage of the battery cell in real time;

The first controller is further configured to detect that the temperature of the battery cell is greater than or equal to a preset battery temperature, or that the current of the battery cell is greater than or equal to a first preset current, or that the battery cell When the voltage is greater than or equal to the first preset voltage, the active switch is controlled to be turned on, so as to raise the operating temperature of the recoverable circuit breaker to the preset operating temperature, thereby causing the recoverable circuit breaker to be disconnected; wherein , the resettable circuit breaker remains open when the operating temperature is greater than or equal to the preset operating temperature, and is turned on when the operating temperature is lower than the preset operating temperature.

Optionally, the first controller is further configured to detect that the temperature of the battery cell is less than a preset battery temperature, the current of the battery cell is less than a first preset current, and the voltage of the battery cell is less than When the first preset voltage is reached, the active switch is controlled to be turned off.

Optionally, the recoverable circuit breaker includes a passive switch assembly and a first heating element, and the resettable circuit breaker control circuit further includes a second heating element; the first heating element and the passive switch assembly are connected in parallel on the Between the battery cell and the external device, one end of the second heating element is connected to the active switch, and the other end of the second heating element is connected to the connection line between the first heating element and the external device above; the end of the active switch away from the second heating element is connected to the first controller;

The second heating element is used to raise the temperature of the passive switch assembly to the preset operating temperature when the active switch is turned on.

Optionally, the first heating element is a first PTC resistor, and the second heating element is a second PTC resistor.

Optionally, the battery protection circuit further includes a charging protection switch connected to the first controller, and the battery cell is connected to a charging device through the recoverable circuit breaker and the charging protection switch in sequence;

The first controller is further configured to detect that the charging device is charging the battery cell, if the resettable circuit breaker is turned on and the active switch is turned off, and the voltage of the battery cell is greater than A second preset voltage, controlling the charging protection switch to turn off, and continuously detecting the voltage of the battery cell; wherein, the second preset voltage is lower than the first preset voltage;

The first controller is also used to control the active switch to turn on when it detects that the voltage of the battery cell is greater than or equal to the first preset voltage, so as to reduce the operating temperature of the resettable circuit breaker to Raising to a preset operating temperature, thereby causing the resettable circuit breaker to open.

Optionally, the battery protection circuit further includes a charging protection switch connected to the first controller, and the battery cell is connected to a charging device through the recoverable circuit breaker and the charging protection switch in sequence;

The first controller is further configured to detect that the charging device is charging the battery cell, if the resettable circuit breaker is turned on and the active switch is turned off, and the current of the battery cell is greater than or equal to the second preset current, control the charging protection switch to turn off, and continuously detect the current of the battery cell; wherein, the second preset current is smaller than the first preset current;

The first controller is further configured to control the active switch to turn on when it detects that the current of the battery cell is greater than or equal to the first preset current, so as to reduce the operating temperature of the resettable circuit breaker to Raising to a preset operating temperature, thereby causing the resettable circuit breaker to open.

Optionally, the battery protection circuit further includes a discharge protection switch connected to the first controller, and the battery cells are connected to electrical equipment through the recoverable circuit breaker and the discharge protection switch in sequence;

The first controller is further configured to detect that the battery cell is discharging the electric device, if the resettable circuit breaker is turned on and the active switch is turned off, and the voltage of the battery cell is If it is greater than the third preset voltage, the discharge protection switch is controlled to be turned off, and the current of the battery cell is continuously detected; wherein, the third preset voltage is lower than the first preset voltage;

The first controller is further configured to control the active switch to turn on when it detects that the current of the battery cell is greater than or equal to the first preset current, so as to reduce the operating temperature of the resettable circuit breaker to Raising to a preset operating temperature, thereby causing the resettable circuit breaker to open.

Optionally, the battery protection circuit further includes a discharge protection switch connected to the control module, and the battery cells are connected to electrical equipment through the recoverable circuit breaker and the discharge protection switch in sequence;

The first controller is further configured to detect that the battery cell is discharging the electric device, if the resettable circuit breaker is turned on and the active switch is turned off, and the current of the battery cell is If the current is greater than the third preset current, the discharge protection switch is controlled to be turned off, and the current of the battery cell is continuously detected; the third preset current is smaller than the first preset current;

The first controller is further configured to control the active switch to turn on when it detects that the current of the battery cell is greater than or equal to the first preset current, so as to reduce the operating temperature of the resettable circuit breaker to Raising to a preset operating temperature, thereby causing the resettable circuit breaker to open.

Optionally, the battery cell is connected to a charging device through the recoverable circuit breaker; the battery protection circuit further includes a second controller, and the second controller is connected to the battery cell and the active switch;

The second controller is configured to control the active switch to turn on when it detects that the voltage of the battery cell is greater than or equal to a preset limit voltage; wherein, the preset limit voltage is greater than the first preset voltage .

In the present invention, the first controller is further configured to detect that the temperature of the battery cell is greater than or equal to the preset battery temperature, or the current of the battery cell is greater than or equal to the first preset current, or the When the voltage of the battery cell is greater than or equal to the first preset voltage, the active switch is controlled to be turned on; after the active switch is turned on, the operating temperature of the resettable circuit breaker will continue to increase during the working process of the battery cell , when the temperature of the resettable circuit breaker rises to the preset operating temperature, the resettable circuit breaker will switch from the on state to the off state according to its own characteristics, and as long as the resettable circuit breaker If the temperature is greater than or equal to the preset action temperature, or the high current and high voltage state of the battery cell is not released, the resettable circuit breaker will always remain in the disconnected state. At this time, the battery cell will not continue The charging or discharging work is carried out with a relatively large current or voltage, thereby avoiding accidents such as explosion and spontaneous combustion of the battery cell due to excessive current or voltage of the battery cell. When the temperature of the resettable circuit breaker is lower than the preset operating temperature, and the high current and high voltage state of the battery cell is released, the resettable circuit breaker remains in the on state, and the resettable The resistance of the circuit breaker will not change so that the resettable circuit breaker can be used repeatedly. In addition, the recoverable disconnection control circuit is used as a secondary protection circuit or a tertiary protection circuit for battery cells.

Another embodiment of the present invention also provides a battery pack, including a battery and the above-mentioned battery protection circuit.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

FIG. 1 is a schematic diagram of a battery protection circuit provided by a first embodiment of the present invention;

2 is a schematic diagram of a battery protection circuit provided by a second embodiment of the present invention;

3 is a schematic diagram of the battery protection circuit provided by the first embodiment of the present invention;

FIG. 4 is a schematic diagram of a battery protection circuit provided by a third embodiment of the present invention;

5 is a schematic diagram of a battery protection circuit provided by a fourth embodiment of the present invention;

FIG. 6 is a working flowchart of the battery protection circuit provided by the fourth embodiment of the present invention.

The reference signs in the instructions are as follows:

1. Recoverable circuit breaker control circuit; 11. Active switch; 12. Recoverable circuit breaker; 121. Passive switch assembly; 122. First heating element; 13. Second heating element; 2. First controller; 3. Charging Protection switch; 4. Discharge protection switch; 5. Second controller; 6. Battery cells; 7. Charging equipment; 8. Electrical equipment.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc. are based on the orientation or position shown in the drawings The relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

As shown in Figures 1 to 3, a battery protection circuit provided by an embodiment of the present invention includes a recoverable disconnect control circuit 1 and a first controller 2; the recoverable disconnect control circuit 1 includes an active switch 11 and a Recovery circuit breaker 12; one end of the active switch 11 is connected to the first controller 2, the other end of the active switch 11 is connected to the recoverable circuit breaker 12 and external equipment, and the recoverable circuit breaker 12 is far away from the outside One end of the device is connected to the battery cell 6; it can be understood that the resettable circuit breaker 12 can be installed inside the battery pack;

The first controller 2 is used to detect the temperature, current and voltage of the battery cell 6 in real time; it can be understood that the first controller 2 can detect the temperature of the battery cell 6 through a temperature detection sensor, etc. Measure and detect the voltage and current of the battery cell 6, etc. It should be noted that the first controller 2 is always in the state of detecting the temperature, voltage and current of the battery cell 6 .

The first controller 2 is also used to detect that the temperature of the battery cell 6 is greater than or equal to the preset battery temperature, or the current of the battery cell 6 is greater than or equal to the first preset current, or the When the voltage of the battery cell 6 is greater than or equal to the first preset voltage, the active switch 11 is controlled to be turned on, so as to raise the operating temperature of the recoverable circuit breaker 12 to the preset operating temperature, thereby making the recoverable The circuit breaker 12 is disconnected; wherein, the resettable circuit breaker 12 remains disconnected when the operating temperature is greater than or equal to the preset operating temperature, and when the operating temperature is lower than the preset operating temperature conduction. Understandably, the preset battery temperature, the first preset voltage, and the first preset current can all be determined according to actual needs; and the preset action temperature is determined by the recoverable disconnection control circuit 1 to determine its own characteristics. Further, when the current of the battery cell 6 is in a high current state, the first controller 2 controls the active switch 11 to be turned on, and after the active switch 11 is turned on, the resettable circuit breaker 12 will rise to the preset operating temperature, and after the temperature of the resettable circuit breaker 12 rises to the preset operating temperature, the resettable circuit breaker 12 will remain in the disconnected state; that is, the When the battery cell 6 is in a high current state, the resettable circuit breaker 12 will always be in an open state; or when the voltage of the battery cell 6 is in a high voltage state, the first controller 2 The active switch 11 will also be controlled to be turned on. After the active switch 11 is turned on, the temperature of the resettable circuit breaker 12 will rise to the preset operating temperature, and the temperature of the resettable circuit breaker 12 will rise. After reaching the preset operating temperature, the resettable circuit breaker 12 remains in the off state; that is, when the battery cell 6 is in a high current state, the resettable circuit breaker 12 will always be in the off state. open state. When the high current and/or high voltage state of the battery cell 6 is released, the first controller 2 will control the active switch 11 to turn off, at this time, the temperature of the resettable circuit breaker 12 will be When the temperature drops below the preset operating temperature, the resettable circuit breaker 12 will be turned on.

Specifically, during the charging process of the battery cell 6, if the first controller 2 detects that the voltage of the battery cell 6 is greater than the first preset voltage, or detects that the voltage of the battery cell 6 When the current is greater than the first preset current, the first controller 2 will control the active switch 11 to be turned on; thereafter, during the charging process of the battery protection circuit, the temperature of the resettable circuit breaker 12 will continue to rise, when the temperature of the resettable circuit breaker 12 rises to the preset operating temperature, the resettable circuit breaker 12 will switch from the on state to the off state according to its own characteristics, and as long as it can When the temperature of the recovery circuit breaker 12 is greater than or equal to the preset operating temperature, the recovery circuit breaker 12 will always remain in the disconnected state (that is, when the high current or high voltage of the battery cell 6 is not released , the first controller controls the active switch 11 to turn on, so that the temperature of the resettable circuit breaker 12 remains above the preset operating temperature, and then the resettable circuit breaker 12 remains in the off state ), at this time, it can be avoided that the charging device 7 continues to charge the battery cell 6 with a relatively large current or voltage, which may cause accidents such as explosion and spontaneous combustion of the battery cell 6; when the battery cell 6 6 when the high current or high voltage is released, the first controller 2 will control the active switch 11 to turn off, and the temperature of the resettable circuit breaker 12 will drop below the preset operating temperature. , the resettable circuit breaker 12 will switch from the off state to the on state, and remain in the on state, so that the resettable circuit breaker 12 can be used repeatedly.

During the discharge process of the battery cell 6, when the first controller 2 detects that the voltage of the battery cell 6 is greater than or equal to the first preset voltage, or detects that the current of the battery cell 6 When the current is greater than or equal to the first preset current, the first controller 2 will control the active switch 11 to be turned on; after that, the working principle of the resettable circuit breaker 12 is the same as the working principle in the charging process Consistent, so it will not be described in detail here. The resettable circuit breaker 12 prevents the battery cell 6 from continuously supplying power to the electrical device 8 with a relatively large current or voltage, which may cause the battery cell 6 to explode, spontaneously ignite, etc. ACCIDENT.

It should be noted that during the process of charging or discharging the battery cell 6, the temperature of the battery cell 6 will increase. When the first controller 2 detects that the temperature of the battery cell 6 is greater than the preset battery temperature, the first controller 2 will control the active switch 11 to be turned on.

In one embodiment, the first controller 2 is further configured to detect that the temperature of the battery cell 6 is lower than the preset battery temperature, the current of the battery cell 6 is lower than the first preset current, and the battery When the voltage of the battery cell 6 is lower than the first preset voltage, the active switch 11 is controlled to be turned off. It can be understood that, during the working process of the battery cell 6, only when the temperature of the battery cell 6 is lower than the preset battery temperature, the current of the battery cell 6 is smaller than the first preset current, and the battery cell 6 When the voltage of the battery cell 6 is lower than the first preset voltage, the first controller 2 will control the active switch 11 to turn off. At this time, during the working process of the battery cell 6, the resettable circuit breaker 12 is The operating temperature will not rise to the preset operating temperature; that is, the battery protection circuit is in a normal charging and discharging state.

In the present invention, the first controller 2 is also used to detect that the temperature of the battery cell 6 is greater than or equal to the preset battery temperature, or the current of the battery cell 6 is greater than or equal to the first preset current , or when the voltage of the battery cell 6 is greater than or equal to the first preset voltage, the active switch 11 is controlled to be turned on; after the active switch 11 is turned on, during the working process of the battery cell 6, the recoverable open circuit The operating temperature of the circuit breaker 12 will continue to increase. When the temperature of the recoverable circuit breaker 12 rises to the preset operating temperature, the recoverable circuit breaker 12 will switch from the on state to the off state according to its own characteristics. , and as long as the temperature of the resettable circuit breaker 12 is greater than or equal to the preset operating temperature, or the state of high current and high voltage of the battery cell 6 is not released, the resettable circuit breaker 12 is always kept in the off state. state, at this time, the battery cell 6 will not continue to charge or discharge with a large current or voltage, thereby avoiding the current or voltage of the battery cell 6 being too high, and the battery cell 6 occurring Explosion, spontaneous combustion and other accidents. When the temperature of the resettable circuit breaker 12 is lower than the preset operating temperature, and the high current and high voltage state of the battery cell 6 is released, the resettable circuit breaker 12 remains in the conduction state, and the The resistance of the resettable circuit breaker 12 will not change, so that the resettable circuit breaker 12 can be used repeatedly. In addition, the recoverable disconnection control circuit 1 is used as a secondary protection circuit or a tertiary protection circuit of the battery cell 6 .

In one embodiment, as shown in FIGS. 1 to 3 , the resettable circuit breaker 12 includes a passive switch assembly 121 and a first heating element 122, and the resettable circuit breaker control circuit 1 further includes a second heating element 13; The first heating element 122 and the passive switch assembly 121 are connected in parallel between the battery cell 6 and the external device, one end of the second heating element 13 is connected to the active switch 11, and the second heating element The other end of 13 is connected to the connection line between the first heating element 122 and the external device; the end of the active switch 11 away from the second heating element 13 is connected to the first controller 2; Understandably, both the first heating element 122 and the second heating element 13 include but are not limited to heating resistors, etc., preferably, the first heating element is a first PTC resistor, and the second heating element is a first heating element. Two PTC resistors. That is, both the first heating element 122 and the second heating element 13 are PTC (Positive Temperature Coefficient, positive temperature coefficient) heating resistors.

The first heating element 122 is used to maintain the current conduction state of the passive switch assembly 121; the second heating element 13 is used to make the passive switch assembly 121 turn on when the active switch 11 is turned on. Heat up to the preset action temperature. Specifically, during the charging process of the battery cell 6, when the first controller 2 controls the active switch 11 to be turned off, the battery cell 6 is connected to the charging device 7 through the passive switch assembly 121, and the The first heating element 122 is short-circuited by the passive switch assembly 121; at this time, the battery cell 6 can perform normal charging work. When the first controller 2 controls the active switch 11 to be turned on, a part of the current or voltage of the charging device 7 enters the battery cell 6 through the switch 121, and another part of the current or voltage passes through the second heating element. 13 flows out, the current or voltage entering the battery cell 6 will be greatly reduced, and at the same time, after the current passes through the second heating element 13, the temperature of the second heating element 13 will rise sharply, so that the passive The temperature of the switch assembly 121 reaches its preset operating temperature, so that the second heating element 13 can assist the passive switch assembly 121 to quickly heat up and make it disconnected, preventing the charging device 7 from continuing to use a large current or voltage to The battery cells 6 are charged, thereby avoiding accidents in the process of the battery cells 6 , and also avoiding accidents such as explosion and spontaneous combustion caused by excessive charging voltage of the battery cells 6 . After the passive switch assembly 121 is disconnected, part of the current of the charging device 7 can return to the negative pole of the charging device 7 through the second heating element 13 and the active switch 11, and the other part of the current enters the battery cell 7 through the first heating element 122 ; Since the first heating element 122 and the second heating element 13 are PTC, positive temperature coefficient resistors. At the preset operating temperature, that is, the resistance value increases significantly, and when the voltage of the external charging device remains unchanged, the current of the entire charging circuit is reduced to 1% to 1‰ before the action; The continuous energy input of the battery cell 6 ensures the safety of the battery cell 6; in addition, during the charging process of the battery cell 6, the first heating element 122 can function as a voltage divider and the second heating element 13 It can function as a shunt, thereby preventing the battery cell 6 from being overcharged.

Further, during the discharge process of the battery cell 6, when the first controller 2 controls the active switch 11 to be turned off, the current of the battery cell 6 directly flows into the electric device 8 through the passive switch assembly 121 , and the first heating element 122 is short-circuited by the passive switch assembly 121 , at this time, the battery cell 6 can perform a normal discharge function. When the first controller 2 detects that the voltage of the battery cell 6 is greater than the first preset voltage, or the current of the battery cell 6 is greater than the first preset current, the first The controller 2 controls the active switch 11 to turn on, a part of the current or voltage of the battery cell 6 charges the electric device 8 through the passive switch assembly 121, and another part of the current or voltage passes through the second heating element 13. Since the resistance of the second heating element 13 is very low at normal temperature, the current flowing through it is very large, so the heat generation of the second heating element 13 is very large; thus, the passive switch assembly 121 The temperature of the temperature rises to the preset action temperature, and then the passive switch assembly is disconnected; and then the current flows through the first heating element 122 and then enters the second heating element 13 and the electrical equipment 8, and the first heating element 122 and the second heating element 13 are all PTC resistors, the resistance value of the first heating element 122 and the second heating element 13 increases after the temperature rises, the current flowing through it decreases, and the external output power decreases to 1‰, at the same time, the first heating element 122 divides the voltage, reducing the external voltage output; thereby avoiding the explosion and spontaneous combustion caused by the battery cell 6 continuing to supply power to the electrical equipment 8 with a relatively large voltage or current and other security incidents.

In one embodiment, the passive switch assembly 121 includes a first end, a second end and a bimetal strip. When the passive switch assembly 121 is below a preset operating temperature, that is, the first end and the second end The two ends are connected; when the passive switch assembly is above the preset operating temperature, the first end and the second end are disconnected due to spatial displacement due to the change of the deformation state of the bimetal sheet; the battery cell 6 is connected to the first end, and the charging device 7 or the electric device 8 is connected to the second end; the first heating element 122 is connected between the first end and the second end. It can be understood that the bimetallic sheet is formed by laminating metal sheets of different materials on both sides; when the temperature of the bimetallic sheet increases, the amount of deformation is different due to the difference in thermal expansion coefficients of the two materials, thus The bimetal strip will be bent and deformed. When the first controller 2 controls the active switch 11 to be turned on and the second heating element 13 has a current passing through it, the action temperature of the bimetal strip reaches the specified value. The preset operating temperature, the bimetal will deform and drive the disconnection between the input end and the output end, at this time, the battery cell 6 is connected to the charging device 7 through the first heating element 122 or the electric device 8; and, when the action temperature of the bimetal strip is greater than the preset action temperature, the passive switch remains in the off state. When the high current or high voltage of the battery cell 6 is released, the first controller 2 will control the active switch 11 to turn off, at this time, the second heating element 13 will have no current passing through, and the No current will flow through the first heating element 122, the temperature of the bimetal strip will drop below the preset action temperature, the bimetal strip will return to its original state, and the first end and the second end will conduct At this time, the battery cell 6 is connected to the charging device 7 or the electric device 8 through the input terminal, the bimetal strip and the second terminal; and the temperature of the bimetal strip is lower than the preset When the operating temperature is lower, the passive switch remains in a conducting state. In this embodiment, after the passive switch assembly 121 operates, the first heating element 122 and the second heating element 13 can return to their original state, and the resistance of the passive switch will not change, so that the passive switch The switch assembly 121 can also be reused.

In the related technology of this application, when the ambient temperature of the resettable circuit breaker 12 reaches the preset operating temperature of the resettable circuit breaker 12, the passive switch assembly 121 can be disconnected, so that the first passive switch assembly 121 terminal and the second terminal, and then disconnect the charging and discharging circuit of the battery cell 6, so as to avoid the influence of the recoverable circuit breaker 12 when the ambient temperature of the resettable circuit breaker 12 is too high. A security risk arises. And when the ambient temperature of the resettable circuit breaker 12 changes to a temperature lower than the action temperature of the resettable circuit breaker 12, the resettable circuit breaker 12 will return to the conduction state (that is, the first terminal and the second terminal pass through Contact conduction), and then the battery charging and discharging circuit is closed. However, since the ambient temperature of the resettable circuit breaker 12 drops below the operating temperature, the battery still has safety risks, and the resettable circuit breaker 12 in the related art cannot effectively reduce the battery safety risk. Therefore, this case proposes Using the cooperation of the first controller 2 with the active switch 11 and the second heating element 13, the resettable circuit breaker 12 can accurately disconnect the battery charging and discharging circuit when the battery has a safety risk (that is, using the first control The device 2 controls the active switch 11 to conduct, and when the second heating element 13 has current flowing, the heat dissipated by the second heating element 13 assists the temperature of the resettable circuit breaker 12 to rise to the preset value. operating temperature, so that the resettable circuit breaker 12 will be disconnected), and restore the battery charging and discharging circuit when the safety risk is removed (that is, when the high voltage or large current of the charging and discharging circuit of the battery cell 6 contacts, the The first controller 2 controls the active switch 11 to break, no current will flow through the second heating element, and the temperature of the resettable circuit breaker 12 will drop below the preset operating temperature, Thus, the recoverable circuit breaker 12 is closed), thereby avoiding battery charging and discharging with higher voltage or current, resulting in safety accidents such as battery explosion and spontaneous combustion, and improving the safety of the battery.

In one embodiment, as shown in FIG. 4 and FIG. 5 , the battery protection circuit further includes a charging protection switch 3 connected to the first controller 2, and the battery cell 6 passes through the recoverable circuit breaker in sequence. The device 12 and the charging protection switch 3 are connected to the charging device 7; it can be understood that the charging protection switch 3 is a primary protection switch for the battery cell 6.

The first controller 2 is also used for detecting that the charging device 7 is charging the battery cell 6, if the resettable circuit breaker 12 is turned on and the active switch 11 is turned off, and it is detected that the The voltage of the battery cell 6 is greater than the second preset voltage, the charging protection switch 3 is controlled to be turned off, and the voltage of the battery cell 6 is continuously detected; wherein, the second preset voltage is lower than the first preset voltage. It can be understood that the first preset voltage is the threshold voltage at which the first controller 2 controls the active switch 11 to be turned on or off during the charging process of the battery cell 6, and generally refers to a safe voltage for battery charging. When the battery voltage reaches the safe voltage, the battery is prone to explosion, fire and other risks, which will cause safety accidents. The second preset voltage is the critical voltage at which the first controller 2 controls the charging protection switch 3 to be turned on or off during the charging process of the battery cell 6, and generally refers to the battery protection for charging the battery cell 6. Voltage, when the charging voltage of the battery cell 6 reaches above the battery protection voltage, it can ensure that the battery 6 can be charged normally without damaging the battery, but when the charging voltage of the battery cell 6 is lower than the battery protection voltage, the battery cell 6 It may damage its service life due to overcharging and other reasons. During a normal battery charging process, the charging protection switch 3 and the passive switch assembly 121 are in a normally closed state, and the active switch 11 is in a normally open state, so as to ensure that the charging device 7 can charge the battery stably . Further, the second preset voltage can be set according to actual needs. In this application, when it is detected that the voltage of the battery 6 is greater than the second preset voltage and less than the first preset voltage, the first controller controls the charging protection switch 3 to turn off, so as to avoid the battery voltage from continuing to rise and damage the battery. life. Further, when the voltage of the battery cell 6 is between the second preset voltage and the first preset voltage, the voltage of the battery cell 6 may cause damage to the battery cell 6 , but it will not cause damage to the battery cell 6 . Safety accidents such as explosion and spontaneous combustion occurred in the battery cell 6 .

Specifically, during the charging process of the battery cell 6, when the first controller 2 detects that the voltage of the battery cell 6 is greater than the second preset voltage and lower than the first preset voltage; at this time, if The charging device 7 continues to charge the battery cell 6, and the battery cell 6 may damage its service life due to excessive voltage; therefore, the first controller 2 controls the charging protection switch 3 to turn off, so that all The above-mentioned charging device 7 will not charge the battery cell 6, thereby preventing the service life of the battery cell 6 from being affected by the excessive charging voltage. It should be noted that when the voltage of the battery cell 6 is lower than the second preset voltage, the charging device 7 charges the battery cell 6 normally through the passive switch assembly 121 and the charging protection switch 3 .

The first controller 2 is also used to control the active switch 11 to turn on when it detects that the voltage of the battery cell 6 is greater than or equal to the first preset voltage, so as to turn on the resettable circuit breaker. The operating temperature of 12 is raised to the preset operating temperature, and then the resettable circuit breaker 12 is disconnected, thereby disconnecting the entire battery charging circuit, preventing the battery voltage from continuing to rise, and avoiding risks such as fire and explosion of the battery. It can be understood that when the first controller 2 controls the charging protection switch 3 to be turned off, the charging protection switch 3 is not actually turned off; thus the charging device 7 will continue to charge the battery cell 6 charging, the charging voltage of the battery cell 6 will continue to increase; when the first controller 2 detects that the charging voltage of the battery cell 6 is greater than or equal to the first preset voltage, the The first controller 2 controls the active switch 11 to be turned on; at this time, a part of the current or voltage of the charging device 7 enters the battery cell 6 through the passive switch assembly 121, and another part of the current or voltage passes through the second The heating element 13 flows out, and the current flows through the second heating element 13 so that the temperature of the second heating element 13 rises sharply, so that the heat of the second heating element 13 makes the temperature of the passive switch assembly 121 reach the Preset operating temperature, the passive switch assembly 121 will be automatically disconnected; after the passive switch assembly 121 is disconnected, a part of the current of the charging device 7 flows into the battery cell 6 through the first heating element 122, and another part of the current It flows out through the second heating element 13. Since the first heating element 121 and the second heating element 13 are PTC resistors, when a current flows through themselves, the first heating element 121 and the second heating element 13 can maintain the passive switch assembly in an off state, so that the The first heating element 122 will have the technical effects of voltage division and current limitation, avoiding accidents such as spontaneous combustion and explosion due to excessive voltage of the battery voltage.

In one embodiment, as shown in FIG. 4 and FIG. 5 , the battery protection circuit further includes a charging protection switch 3 connected to the first controller 2, and the battery cell 6 passes through the recoverable circuit breaker in sequence. The device 12 and the charging protection switch 3 are connected to the charging device 7 .

The first controller 2 is also used for detecting that the charging device 7 is charging the battery cell 6, if the resettable circuit breaker 12 is turned on and the active switch 11 is turned off, and it is detected that the When the current of the battery cell 6 is greater than or the second preset current and less than the first preset current, the charging protection switch 3 is controlled to be turned off, and the current of the battery cell 6 is continuously detected. Understandably, the first preset current is the critical current at which the first controller 2 controls the active switch 11 to be turned on or off during the charging process of the battery cell 6, and generally refers to a safe current for battery charging. When the battery charging current reaches the safe current value, the battery is prone to explosion, fire and other risks, which will cause safety accidents. The second preset current is the critical current at which the first controller 2 controls the charging protection switch 3 to be turned off or on during the charging process of the battery cell 6, and the second preset current can be determined according to the actual situation. It can be set according to the requirement, generally refers to the battery protection current for battery charging, when the battery charging current is below the battery protection current, it can ensure the normal charging of the battery without damaging the battery, but when the battery charging current is greater than the battery protection current, then Batteries may impair their lifespan. Further, the second preset current can be set according to actual needs. In this application, when it is detected that the charging current of the battery 6 is greater than the second preset current and less than the first preset current, the first controller controls the charging protection switch 3 to turn off, so as to prevent the battery current from continuing to rise and damage the battery. Battery Life. Further, when the charging current of the battery cell 6 is between the second preset current and the first preset current, the current of the battery cell 6 may cause damage to the battery cell 6, but it will not Cause safety accidents such as explosion and spontaneous combustion in the battery cell 6 .

Specifically, during the charging process of the battery cell 6, when the first controller 2 detects that the current of the battery cell 6 is greater than the second preset current and less than the first preset current; at this time , if the charging device 7 continues to charge the battery cell 6, the battery cell 6 may damage its service life due to an excessive charging current; therefore, the first controller 2 controls the charging protection switch 3 to turn off, Therefore, the charging device 7 will not charge the battery cell 6, thereby preventing the service life of the battery cell 6 from being affected by excessive charging voltage. It should be noted that when the charging current of the battery cell 6 is less than the second preset current, the charging device 7 charges the battery cell 6 through the passive switch assembly 121 and the charging protection switch 3 .

The first controller 2 is also used to control the active switch 11 to turn on when it detects that the current of the battery cell 6 is greater than or equal to the first preset current, so as to turn on the resettable circuit breaker. The operating temperature of 12 is raised to the preset operating temperature, and then the resettable circuit breaker 12 is disconnected, thereby disconnecting the entire battery charging circuit, preventing the battery current from continuing to rise, and avoiding risks such as fire and explosion of the battery. It can be understood that when the first controller 2 controls the charging protection switch 3 to be turned off, the charging protection switch 3 is not actually turned off; thus the charging device 7 will continue to charge the battery cell 6 charging, the charging current of the battery will continue to increase; the first controller 2 controls the active switch 11 to be turned on; at this time, a part of the current or voltage of the charging device 7 enters the battery through the passive switch assembly 121 The battery cell 6, another part of the current or voltage flows out through the second heating element 13, and the current flows through the second heating element 13 so that the temperature of the second heating element 13 rises sharply, so that the second heating element 13 The heat of the passive switch assembly 121 makes the temperature of the passive switch assembly 121 reach the preset action temperature, and the passive switch assembly 121 will be automatically disconnected; after the passive switch is disconnected, a part of the current of the charging device 7 flows through the first heating element 122 Into the battery cell 6 , another part of the current flows out through the second heating element 13 . Since the first heating element 121 and the second heating element 13 are PTC resistors, when a current flows through themselves, the first heating element 121 and the second heating element 13 can maintain the passive switch assembly in an off state, so that the The first heating element 122 will play a technical effect of shunting, avoiding accidents such as spontaneous combustion and explosion caused by excessive current of the battery voltage. And since the first heating element 122 and the second heating element 13 can keep the passive switching assembly 121 disconnected after the passive switch assembly 121 is disconnected, thereby improving the safety of the battery, avoiding the continuous increase of the battery charging current and reducing the battery life. Risk of fire or even explosion.

In one embodiment, as shown in FIG. 4 and FIG. 5 , the battery protection circuit further includes a discharge protection switch 4 connected to the first controller 2, and the battery cell 6 passes through the recoverable circuit breaker in sequence. The device 12 and the discharge protection switch 4 are connected to the electrical equipment 8; it can be understood that the discharge protection switch 4 is a primary protection switch for the battery cell 6.

The first controller 2 is further configured to detect that the battery cell 6 is discharging the electric device 8, if the resettable circuit breaker 12 is turned on and the active switch 11 is turned off, and the When the voltage of the battery cell 6 is lower than the third preset voltage, the discharge protection switch 4 is controlled to be turned off, and the current of the battery cell 6 is continuously detected; wherein, the third preset voltage is lower than the first preset voltage Preset voltage; understandably, the third preset voltage is the critical voltage at which the first controller 2 controls the discharge protection switch 4 to be turned on or off during the discharge process of the battery cell 6; generally refers to The battery protection voltage of the battery cell 6 discharge, when the discharge voltage of the battery cell 6 is above the third preset voltage and below the first preset voltage, it can ensure that the battery 6 can be discharged normally, and will not damage the battery; but when the discharge voltage of the battery cell 6 is below the second preset voltage, the battery cell 6 will damage its service life due to excessive discharge. While the discharge protection switch 4 and the passive switch assembly 121 are in a normally closed state, the active switch 11 is in a normally open state; that is, the battery cell 6 is in the process of normal discharge, and the discharge protection switch 4 and the passive switch component 121 are in the on state, and the active switch 11 is in the off state. Further, the third preset voltage can be set according to actual needs; and the battery cells 6 are normally discharged with constant current or constant power. In the present application, when it is detected that the discharge voltage of the battery 6 is lower than the third preset voltage, the discharge protection switch 4 is controlled to be turned off, so as to prevent the battery voltage from continuing to decrease and damage the battery life.

Specifically, during the discharge process of the battery cell 6, when the first controller 2 detects that the voltage of the battery cell 6 is greater than the third preset voltage; at this time, if the battery cell 6 continues to When the electrical equipment 8 is discharged, accidents such as drumming and liquid leakage may occur in the battery cell 6; at this time, the first controller 2 controls the discharge protection switch 4 to turn off, so that the battery cell 6 will not be damaged. The electrical equipment 8 is discharged, which avoids the battery cell 6 from being too low in voltage due to continuous discharge, and then bulging and liquid leakage accidents occur. It should be noted that when the voltage of the battery cell 6 is lower than the third preset voltage, the battery cell 6 performs normal discharge to the electric device 8 through the passive switch and the discharge protection switch 4 .

The first controller 2 is also used to control the active switch 11 to turn on when it detects that the current of the battery cell 6 is greater than or equal to the first preset current, so as to turn on the resettable circuit breaker. The operating temperature of 12 is raised to the preset operating temperature, and then the resettable circuit breaker 12 is disconnected, thereby disconnecting the entire battery discharge circuit, preventing the battery from continuing to discharge at a large current, and avoiding risks such as fire and explosion of the battery. It can be understood that when the first controller 2 controls the discharge protection switch 4 to be disconnected, the discharge protection switch 4 is not actually disconnected; thus, the battery cell 6 will continue to discharge with a relatively large current When the electrical equipment 8 is discharged, the voltage of the battery cell 6 will continue to decrease; when the first controller 2 detects that the current of the battery cell 6 is greater than or equal to the first preset current , the first controller 2 controls the active switch 11 to be turned on, at this time, a part of the current of the battery cell 6 enters the electric device 8 through the passive switch assembly 121, and another part of the current passes through the passive switch assembly 122 and the second heating element 13 flow out; thereafter, both the passive switch assembly 122 and the second heating element 13 have current flow, so that the first heating element 122 and the second heating element 13 The temperature will increase, so that the action temperature of the passive switch assembly 121 reaches the preset action temperature, and the passive switch assembly 121 is automatically disconnected; after the passive switch assembly 121 is automatically disconnected, the battery A part of the current of the battery cell 6 flows into the electric device 8 through the first heating element 122, and another part of the current flows back to the battery cell through the first heating element 122 and the second heating element 13, thereby avoiding the battery cell 6 Continuously discharge the electrical equipment 8 with a large current, and accidents such as explosion and spontaneous combustion occur.

In one embodiment, as shown in FIG. 3 and FIG. 4 , the battery protection circuit further includes a discharge protection switch 4 connected to the first controller 2, and the battery cell 6 passes through the recoverable circuit breaker in sequence. The device 12 and the discharge protection switch 4 are connected to the electrical equipment 8 .

The first controller 2 is further configured to detect that the battery cell 6 is discharging the electric device 8, if the resettable circuit breaker 12 is turned on and the active switch 11 is turned off, and the When the current of the battery cell 6 is greater than the third preset current, the discharge protection switch 4 is controlled to be turned off, and the current of the battery cell 6 is continuously detected; the third preset current is less than the first preset current current; understandably, the third preset current is the critical current at which the first controller 2 controls the discharge protection switch 4 to be turned on or off during the discharge process of the battery cell 6; generally refers to The battery protection current for battery discharge, when the discharge current of the battery cell 6 is below the battery protection current, it can ensure that the battery 6 can discharge normally without damaging the battery; but the discharge current of the battery cell 6 is below the battery protection current. When the current is above, the battery cell 6 will damage its service life due to excessive current discharge. The first preset current is the critical current that the first controller controls the active switch 11 to turn on or off during the discharge process of the battery cell 6; it generally refers to the current value of the safe current for battery discharge , when the battery discharge current is above the safe current, the battery is prone to explosion, fire and other risks, which will cause safety accidents. The third preset current can be set according to actual needs. In the present application, when it is detected that the discharge current of the battery 6 is greater than the third preset current and less than the first preset current, the first controller controls the discharge protection switch 4 to turn off, so as to avoid the discharge current of the battery from continuing to rise, And damage the battery life. Further, when the discharge current of the battery cell 6 is between the third preset current and the first preset current, the discharge current of the battery cell 6 may cause damage to the battery cell 6, but not As for causing safety accidents such as explosion and spontaneous combustion in the battery cell 6 .

Specifically, during the discharge process of the battery cell 6, when the first controller 2 detects that the current of the battery cell 6 is greater than the third preset current and smaller than the first preset current; at this time , if the battery cell 6 continues to discharge the electrical equipment 8 with a higher current, the battery cell 6 may damage its service life due to excessive discharge current; therefore, the first controller 2 controls the discharge The protection switch 4 is turned off, so that the battery cell 6 will not discharge the electrical equipment 8, thereby preventing the service life of the battery cell 6 from being affected by an excessive discharge current.

The first controller 2 is also used to control the active switch 11 to turn on when it detects that the current of the battery cell 6 is greater than or equal to the first preset current, so as to turn on the resettable circuit breaker. The operating temperature of 12 is raised to the preset operating temperature, and then the resettable circuit breaker 12 is disconnected, thereby disconnecting the entire battery discharge circuit, preventing the battery from continuing to discharge at a large current, and avoiding risks such as fire and explosion of the battery. It can be understood that when the first controller 2 controls the discharge protection switch 4 to be disconnected, the discharge protection switch 4 is not actually disconnected; thus, the battery cell 6 will continue to discharge with a relatively large current Discharge the electrical equipment 8, the battery cell 6 will continue to generate electricity, the first controller 2 controls the active switch 11 to be turned on, at this time, a part of the current of the battery cell 6 passes through the passive switch assembly 121 enters the electrical equipment 8, and another part of the current returns to the negative pole of the battery cell 6 through the first heating element 122 and the second heating element 13; thereafter, the first heating element 122 and the second heating element 13 has a current flowing through them, so that the heat of the first heating element 122 and the second heating element 13 will make the action temperature of the passive switch assembly 121 reach the preset action temperature, and then drive the passive switch assembly 121 The switch assembly 121 is disconnected; after the passive switch assembly 121 is disconnected, a part of the current of the battery cell 6 flows into the electrical equipment 8 through the first heating element 122, and another part of the current flows through the first heating element 122 and the second heating element 122. The heating element 13 flows back to the battery cell, thereby avoiding accidents such as explosion and spontaneous combustion caused by the battery cell 6 continuously discharging a large current to the electrical device 8 .

In one embodiment, as shown in FIG. 4 and FIG. 5 , the battery cell 6 is connected to the charging device 7 through the recoverable circuit breaker 12; the battery protection circuit further includes a second controller 5, and the first The second controller 5 is connected to the battery cell 6 and the active switch 11; understandably, both the second controller 5 and the first controller 2 can control the active switch 11 to be turned on and off .

The second controller 5 is used to control the active switch 11 to turn on when it detects that the voltage of the battery cell 6 is greater than or equal to a preset limit voltage; wherein, the preset limit voltage is greater than the first preset voltage a preset voltage. It can be understood that the preset limit voltage is the critical voltage at which the second controller 5 controls the active switch 11 to be turned on or off during the process of charging the battery cell 6, which generally refers to the threshold voltage for charging the battery. Limit voltage, when the battery voltage reaches the limit voltage, the battery is very prone to explosion, fire and other risks, which will cause safety accidents. It should be noted that the limit preset voltage is greater than the first preset voltage, and the first preset voltage is greater than the second preset voltage. The second preset voltage charges the battery cell 6 During the process, the first controller 2 controls the critical voltage of the charging protection switch 3 to be turned on or off, which generally refers to the battery protection voltage of battery charging (that is, when the charging cell is in the second preset When the voltage is below the set voltage, the battery can perform normal charging work without damaging its service life; when the charging cell is above the second preset voltage, the battery will not damage its service life due to the high charging voltage); During the process of charging the battery cell 6 by the first preset voltage, the first controller 2 controls the threshold voltage at which the active switch 11 is turned on or off, which generally refers to a safe voltage for battery charging ( That is, when the charging cell is above the first preset voltage, the battery is prone to accidents such as explosion and spontaneous combustion due to the charging voltage being too high). Further, when the charging voltage of the battery is greater than the preset limit voltage, the probability of accidents such as explosion and spontaneous combustion of the battery is high; when the charging voltage of the battery is between the first preset voltage and the preset limit voltage , the battery exploded. The probability of accidents such as spontaneous combustion is high; when the charging voltage of the battery is between the second preset voltage and the first preset voltage, the service life of the battery will be damaged during charging, and safety accidents such as explosion and spontaneous combustion will not occur; or The probability of safety accidents such as explosion and spontaneous combustion is low; when the charging voltage of the battery is below the second preset voltage, the battery can perform normal charging work. Specifically, in the process of charging the battery cell 6 by the charging device 7, when the first controller 2 detects that the voltage of the battery cell 6 is greater than the first preset voltage, the first controller 2. When the first active switch 11 is turned on, the first heating element 122 will have the technical effects of voltage division and current limitation, so as to avoid accidents such as spontaneous combustion and explosion of the battery cell 6 due to excessive voltage; If the first controller 2 is due to failure or other reasons, when the voltage of the battery cell 6 is greater than or equal to the first preset voltage, the active switch 11 is not turned on; at this time, the battery cell The voltage of the cell 6 will further increase, and when the second controller 5 detects that the voltage of the battery cell 6 is greater than or equal to the limit preset voltage, the second controller 5 will control the active switch 11 Conduction, so that the first heating element 122 and the second heating element 13 are connected to the charging circuit of the battery cell 6, thereby avoiding accidents such as spontaneous combustion and explosion caused by the voltage of the battery cell 6 being too high .

Further, each battery pack is composed of a plurality of battery cells 6, and each of the battery cells 6 will share a part of the total voltage of the charging device 7; during the assembly of the battery pack, the When the voltage signal of one or more battery cells 6 is disconnected, due to the internal detection of the first controller 2, the voltage value detected by the first controller 2 is higher than the actual cell voltage value and a malfunction will occur. At this time, When the second controller 5 detects that the voltage value is higher than the preset limit voltage, the second controller 5 controls the active switch 11 to be turned on, and then the battery protection circuit will be connected with The resettable circuit breaker 12, when the voltage of the battery cell 12 is too high, it will cause the passive switch to be disconnected, so that the voltage of the battery cell 6 continues to rise; because the use of The resettable circuit breaker 12 can be restored without damaging the battery pack after its connection is normal.

It should be noted that in the battery protection circuit shown in Figure 3, the charge protection switch 3 and the discharge protection switch 4 are primary protection switches of the battery pack, and the recoverable disconnection control circuit 1 is a battery pack In addition, each battery cell 6 also needs to design a third-level protection switch. In the embodiment shown in FIG. 4, one of the three-level protection switches is the recoverable disconnection control circuit 1, and the recoverable disconnection control circuit 1 can enter the third-level protection switch and the second-level protection switch. Therefore, a secondary protection switch is reduced in the battery protection circuit, which reduces the problems of space layout and thermal reaction concentration of the battery protection circuit.

Another embodiment of the present invention also provides a battery pack, including a battery and the above-mentioned battery protection circuit. It can be understood that the battery can be provided with multiple battery cells 6 according to actual needs.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention .

Claims (10)

1. A battery protection circuit, comprising a resettable circuit control circuit and a first controller; the restorable circuit-breaking control circuit comprises an active switch and a restorable circuit breaker; one end of the active switch is connected with the first controller, the other end of the active switch is connected with the restorable circuit breaker and external equipment, and one end, far away from the external equipment, of the restorable circuit breaker is connected with the battery cell;

the first controller is used for detecting the temperature, the current and the voltage of the battery cell in real time;

the first controller is further configured to control the active switch to be turned on when detecting that the temperature of the battery electric core is greater than or equal to a preset battery temperature, or the current of the battery electric core is greater than or equal to a first preset current, or the voltage of the battery electric core is greater than or equal to a first preset voltage, so as to raise the action temperature of the recoverable circuit breaker to a preset action temperature, and further disconnect the recoverable circuit breaker; the recoverable circuit breaker keeps off when the action temperature is greater than or equal to the preset action temperature, and is switched on when the action temperature is less than the preset action temperature.

2. The battery protection circuit of claim 1, wherein the first controller is further configured to control the active switch to be turned off when it is detected that the temperature of the battery cell is less than a preset battery temperature, the current of the battery cell is less than a first preset current, and the voltage of the battery cell is less than a first preset voltage.

3. The battery protection circuit of claim 1, wherein the recoverable circuit breaker comprises a passive switch assembly and a first heat generating component, the recoverable circuit breaker control circuit further comprising a second heat generating component; the first heating element and the passive switch component are connected in parallel between the battery cell and external equipment, one end of the second heating element is connected with the active switch, and the other end of the second heating element is connected to a connecting circuit between the first heating element and the external equipment; one end of the active switch, which is far away from the second heating element, is connected with the first controller;

the second heating part is used for heating the passive switch assembly to the preset action temperature when the active switch is switched on.

4. The battery protection circuit of claim 1, wherein the first heat generating member is a first PTC resistor and the second heat generating member is a second PTC resistor.

5. The battery protection circuit of claim 1, further comprising a charge protection switch connected to the first controller, wherein the battery cell is connected to a charging device through the recoverable circuit breaker and the charge protection switch in sequence;

the first controller is further configured to, when it is detected that the charging device charges the battery electric core, control the charging protection switch to be turned off and continuously detect the voltage of the battery electric core if the recoverable circuit breaker is turned on and the active switch is turned off, and the voltage of the battery electric core is greater than a second preset voltage; wherein the second preset voltage is less than the first preset voltage;

the first controller is further configured to control the active switch to be turned on when it is detected that the voltage of the battery electric core is greater than or equal to the first preset voltage, so as to raise the action temperature of the recoverable circuit breaker to a preset action temperature, and further disconnect the recoverable circuit breaker.

6. The battery protection circuit of claim 1, further comprising a charge protection switch connected to the first controller, wherein the battery cell is connected to a charging device through the recoverable circuit breaker and the charge protection switch in sequence;

the first controller is further configured to, when it is detected that the charging device charges the battery electric core, control the charging protection switch to be turned off and continuously detect the current of the battery electric core if the recoverable circuit breaker is turned on and the active switch is turned off, and the current of the battery electric core is greater than or equal to a second preset current; wherein the second preset current is smaller than the first preset current;

the first controller is further configured to control the active switch to be turned on when it is detected that the current of the battery electric core is greater than or equal to the first preset current, so as to raise the action temperature of the recoverable circuit breaker to a preset action temperature, and further disconnect the recoverable circuit breaker.

7. The battery protection circuit of claim 1, further comprising a discharge protection switch connected to the first controller, the battery cells being connected to a consumer in sequence through the recoverable circuit breaker and the discharge protection switch;

the first controller is further configured to, when detecting that the battery electric core discharges electric equipment, if the recoverable circuit breaker is turned on and the active switch is turned off, and the voltage of the battery electric core is smaller than a third preset voltage, control the discharge protection switch to be turned off, and continuously detect the current of the battery electric core; wherein the third preset voltage is less than the first preset voltage;

the first controller is further configured to control the active switch to be turned on when detecting that the current of the battery electric core is greater than or equal to the first preset current, so as to raise the action temperature of the recoverable circuit breaker to a preset action temperature, and further disconnect the recoverable circuit breaker.

8. The battery protection circuit of claim 1, further comprising a discharge protection switch connected to the control module, wherein the battery cell is connected to a power consumer in sequence through the recoverable circuit breaker and the discharge protection switch;

the first controller is further configured to, when it is detected that the battery electric core discharges the electric equipment, control the discharge protection switch to be turned off and continuously detect the current of the battery electric core if the recoverable circuit breaker is turned on and the active switch is turned off, and the current of the battery electric core is greater than a third preset current; the third preset current is smaller than the first preset current;

the first controller is further configured to control the active switch to be turned on when it is detected that the current of the battery electric core is greater than or equal to the first preset current, so as to raise the action temperature of the recoverable circuit breaker to a preset action temperature, and further disconnect the recoverable circuit breaker.

9. The battery protection circuit of claim 1, wherein the battery cells are connected to a charging device through the recoverable circuit breaker; the battery protection circuit further comprises a second controller, and the second controller is connected with the battery electric core and the active switch;

the second controller is used for controlling the active switch to be conducted when the voltage of the battery electric core is detected to be greater than or equal to a limit preset voltage; wherein the limit preset voltage is greater than the first preset voltage.

10. A battery pack comprising a battery and the battery protection circuit according to any one of claims 1 to 9.

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