CN115693806A

CN115693806A - Battery protection circuit and battery pack

Info

Publication number: CN115693806A
Application number: CN202110826648.4A
Authority: CN
Inventors: 周继浩; 李康泉; 蔡小丽
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2023-02-03

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a battery protection circuit and a battery pack. The battery protection circuit comprises a recoverable open-circuit control circuit and a first controller; the recoverable circuit-breaking control circuit comprises an active switch connected with the first controller and a recoverable circuit breaker connected with the battery electric core; the first controller is further configured to control the active switch to be turned on when it is detected 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. According to the invention, the circuit breaking control circuit can be recovered for repeated use after action, and the battery protection circuit is used as a secondary protection circuit or a tertiary protection circuit of a battery cell.

Description

Battery protection circuit and battery pack

Technical Field

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

Background

Secondary protection devices such as mobile phone batteries, notebook batteries, flat batteries and the like in the market generally use schemes such as positive temperature coefficient resistors (PTC), temperature fuses and the like. The PTC is a high molecular polymer material, the internal resistance of the PTC cannot be completely recovered after each action, meanwhile, the material is influenced by temperature, humidity, corrosive gas and the like in the use environment, and after the PTC is used for a period of time, the internal resistance of the PTC becomes large, so that the usable capacity of the battery is reduced, and the loss of the battery in the self direction is increased. In addition, the thermal fuse cannot be reused after the thermal fuse is activated, thereby causing waste of resources and further causing scrapping of the user terminal.

Disclosure of Invention

The invention solves the technical problems that a battery secondary protection device in the prior art cannot be repeatedly used after action and the like, and provides a battery protection circuit and a battery pack.

An embodiment of the invention provides a battery protection circuit, which comprises a recoverable open-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 a 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.

Optionally, 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 electric core is lower than a preset battery temperature, the current of the battery electric core is lower than a first preset current, and the voltage of the battery electric core is lower than a first preset voltage.

Optionally, the recoverable circuit breaker comprises a passive switch assembly and a first heat generating element, and the recoverable circuit breaker control circuit further comprises a second heat generating element; 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 element is used for heating the passive switch assembly to the preset action temperature when the active switch is switched on.

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

Optionally, the battery protection circuit further includes a charge protection switch connected to the first controller, and 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.

Optionally, the battery protection circuit further includes a charge protection switch connected to the first controller, and the battery core 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.

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

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 voltage of the battery electric core is greater than a third preset voltage; wherein the third preset voltage is less than the first preset voltage;

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

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;

Optionally, the battery electric core is 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.

In the invention, 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; after the active switch is switched on, the action temperature of the recoverable circuit breaker is continuously increased in the working process of the battery cell, when the temperature of the recoverable circuit breaker is increased to a preset action temperature, the recoverable circuit breaker is switched from a switched-on state to a switched-off state according to the self characteristic, and the recoverable circuit breaker is always kept in the switched-off state as long as the temperature of the recoverable circuit breaker 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, at the moment, the battery cell can not continuously perform charging or discharging work with larger current or voltage, and therefore the accidents that the current or voltage of the battery cell is too high, the battery cell explodes, spontaneously ignites and the like are avoided. When the temperature of the recoverable circuit breaker is lower than the preset action temperature and the high-current and high-voltage state of the battery core is relieved, the recoverable circuit breaker is kept in a conducting state, and the resistance of the recoverable circuit breaker cannot be changed, so that the recoverable circuit breaker can be repeatedly used. In addition, the recoverable open circuit control circuit is used as a secondary protection circuit or a tertiary protection circuit of the battery cell.

Another embodiment of the present invention further provides a battery pack, which includes a battery and the battery protection circuit.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic diagram of a battery protection circuit according to a first embodiment of the invention;

fig. 2 is a schematic diagram of a battery protection circuit according to a second embodiment of the present invention;

fig. 3 is a schematic diagram of a battery protection circuit according to a first embodiment of the present invention;

fig. 4 is a schematic diagram of a battery protection circuit according to a third embodiment of the invention;

fig. 5 is a schematic diagram of a battery protection circuit according to a fourth embodiment of the invention;

fig. 6 is a flowchart illustrating an operation of a battery protection circuit according to a fourth embodiment of the present invention.

The reference numerals in the specification are as follows:

1. the circuit breaking control circuit can be restored; 11. an active switch; 12. a recoverable circuit breaker; 121. a passive switch assembly; 122. a first heat generating member; 13. a second heat generating member; 2. a first controller; 3. a charging protection switch; 4. a discharge protection switch; 5. a second controller; 6. a battery cell; 7. a charging device; 8. an electric device.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to fig. 3, a battery protection circuit according to an embodiment of the present invention includes a recoverable disconnection control circuit 1 and a first controller 2; the recoverable circuit breaker control circuit 1 comprises an active switch 11 and a recoverable 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 an external device, and one end of the recoverable circuit breaker 12, which is far away from the external device, is connected to the battery electric core 6; it is to be understood that the recoverable circuit breaker 12 may be mounted inside a battery pack; and the external devices include, but are not limited to, the charging device 7 and the powered device 8.

The first controller 2 is used for detecting the temperature, the current and the voltage of the battery electric core 6 in real time; it is to be understood that the first controller 2 may detect the temperature of the battery cell 6 through a temperature detection sensor or the like, and may detect the voltage and current of the battery cell 6 through an electricity meter. Incidentally, the first controller 2 is always in a state of detecting the temperature, voltage, and current of the battery cell 6.

The first controller 2 is further configured to control the active switch 11 to be turned on when detecting that the temperature of the battery electric core 6 is greater than or equal to a preset battery temperature, or the current of the battery electric core 6 is greater than or equal to a first preset current, or the voltage of the battery electric core 6 is greater than or equal to a first preset voltage, so as to raise the action temperature of the recoverable circuit breaker 12 to a preset action temperature, and further turn off the recoverable circuit breaker 12; wherein the recoverable circuit breaker 12 remains off when the operating temperature is greater than or equal to the preset operating temperature and is on when the operating temperature is less than the preset operating temperature. It can be understood that the preset battery temperature, the first preset voltage and the first preset current can be determined according to actual requirements; and the preset operating temperature is determined by the characteristics of the resettable circuit control 1 itself. Further, when the current of the battery electric core 6 is in a large-current state, the first controller 2 controls the active switch 11 to be turned on, after the active switch 11 is turned on, the temperature of the recoverable circuit breaker 12 may rise to the preset action temperature, and after the temperature of the recoverable circuit breaker 12 rises to the preset action temperature, the recoverable circuit breaker 12 is kept in a disconnected state; that is, when the battery electric core 6 is in a high-current state, the recoverable circuit breaker 12 will be in an off state all the time; or when the voltage of the battery electric core 6 is in a high voltage state, the first controller 2 also controls the active switch 11 to be turned on, after the active switch 11 is turned on, the temperature of the recoverable circuit breaker 12 is increased to the preset action temperature, and after the temperature of the recoverable circuit breaker 12 is increased to the preset action temperature, the recoverable circuit breaker 12 is kept in a disconnected state; that is, when the battery electric core 6 is in a high-current state, the recoverable circuit breaker 12 is always in an off state. When the high-current and/or high-voltage state of the battery electric core 6 is released, the first controller 2 controls the active switch 11 to be turned off, at this time, the temperature of the recoverable circuit breaker 12 is reduced to be lower than the preset action temperature, and the recoverable circuit breaker 12 is in a conducting state.

Specifically, in the process of charging the battery electric core 6, if the first controller 2 detects that the voltage of the battery electric core 6 is greater than the first preset voltage, or detects that the current of the battery electric core 6 is greater than the first preset current, the first controller 2 controls the active switch 11 to be turned on; thereafter, in the process of charging the battery protection circuit, the temperature of the recoverable circuit breaker 12 will continue to rise, when the temperature of the recoverable circuit breaker 12 rises to a preset action temperature, the recoverable circuit breaker 12 switches from a conducting state to a disconnecting state according to its own characteristics, and as long as the temperature of the recoverable circuit breaker 12 is greater than or equal to the preset action temperature, the recoverable circuit breaker 12 is always kept in the disconnecting state (that is, when the large current or the high voltage of the battery electric core 6 is not released, the first controller controls the active switch 11 to be turned on, so that the temperature of the recoverable circuit breaker 12 is kept above the preset action temperature, and the recoverable circuit breaker 12 keeps the disconnecting state), at this time, the recoverable circuit breaker can avoid that the charging device 7 continues to charge the battery electric core 6 with a large current or voltage, and the battery electric core 6 is subjected to accidents such as explosion, spontaneous combustion, and the like; when the large current or the high voltage of the battery electric core 6 is removed, the first controller 2 controls the active switch 11 to be turned off, the temperature of the recoverable circuit breaker 12 is reduced to be lower than the preset action temperature, and at this time, the recoverable circuit breaker 12 is switched from the off state to the on state and is kept in the on state, so that the recoverable circuit breaker 12 can be repeatedly used.

In the process of discharging the battery electric core 6, when the first controller 2 detects that the voltage of the battery electric core 6 is greater than or equal to the first preset voltage, or detects that the current of the battery electric core 6 is greater than or equal to the first preset current, the first controller 2 controls the active switch 11 to be turned on; after that, the working principle of the recoverable circuit breaker 12 is consistent with that in the charging process, and is not described herein again, and the recoverable circuit breaker 12 avoids accidents such as explosion, spontaneous combustion and the like of the battery electric core 6 caused by the fact that the battery electric core 6 continuously supplies power to the electric equipment 8 with a relatively large current or voltage.

Specifically, during the charging or discharging process of the battery electric core 6, the temperature of the battery electric core 6 will rise, and when the first controller 2 detects that the temperature of the battery electric core 6 is greater than the preset battery temperature, the first controller 2 will control the active switch 11 to be turned on.

In an embodiment, the first controller 2 is further configured to control the active switch 11 to be turned off when it is detected that the temperature of the battery electric core 6 is lower than a preset battery temperature, the current of the battery electric core 6 is lower than a first preset current, and the voltage of the battery electric core 6 is lower than a first preset voltage. As can be understood, during the operation of the battery cell 6, only when the temperature of the battery cell 6 is less than the preset battery temperature, the current of the battery cell 6 is less than the first preset current, and the voltage of the battery cell 6 is less than the first preset voltage, the first controller 2 will control the active switch 11 to be turned off, and at this time, during the operation of the battery cell 6, the recoverable circuit breaker 12 will not rise to the preset operation temperature at the operation temperature; that is, the battery protection circuit is in a normal charge and discharge state.

In the present invention, the first controller 2 is further configured to control the active switch 11 to be turned on when detecting that the temperature of the battery electric core 6 is greater than or equal to a preset battery temperature, or the current of the battery electric core 6 is greater than or equal to a first preset current, or the voltage of the battery electric core 6 is greater than or equal to a first preset voltage; after the active switch 11 is turned on, in the working process of the battery electric core 6, the action temperature of the recoverable circuit breaker 12 will continue to be increased, when the temperature of the recoverable circuit breaker 12 rises to the preset action temperature, the recoverable circuit breaker 12 will be switched from the on state to the off state according to the characteristics of the recoverable circuit breaker 12, and as long as the temperature of the recoverable circuit breaker 12 is greater than or equal to the preset action temperature, or the state of the battery electric core 6 with large current and high voltage is not released, the recoverable circuit breaker 12 will always be kept in the off state, at this time, the battery electric core 6 will not continue to perform charging or discharging work with large current or voltage, thereby avoiding the accidents of the battery electric core 6, such as explosion, spontaneous combustion and the like, due to the excessively high current or voltage of the battery electric core 6. When the temperature of the recoverable circuit breaker 12 is lower than the preset action temperature and the high-current and high-voltage state of the battery electric core 6 is released, the recoverable circuit breaker 12 is kept in a conducting state, and the resistance of the recoverable circuit breaker 12 cannot be changed, so that the recoverable circuit breaker 12 can be repeatedly used. 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 an embodiment, as shown in fig. 1 to 3, the recoverable circuit breaker 12 comprises a passive switch assembly 121 and a first heat generating element 122, and the recoverable circuit breaker control circuit 1 further comprises a second heat generating element 13; the first heating element 122 and the passive switch assembly 121 are connected in parallel between the battery cell 6 and an external device, one end of the second heating element 13 is connected to the active switch 11, and the other end of the second heating element 13 is connected to a connection line between the first heating element 122 and the external device; one end of the active switch 11, which is far away from the second heating element 13, is connected with the first controller 2; it is understood that the first heat generating part 122 and the second heat generating part 13 each include, but are not limited to, a heat generating resistor, etc., and preferably, the first heat generating part is a first PTC resistor, and the second heat generating part is a second PTC resistor. That is, both the first heat generating element 122 and the second heat generating element 13 are PTC (Positive Temperature Coefficient) heat generating resistors.

The first heating element 122 is used for maintaining the passive switch element 121 in a current conducting state; the second heating element 13 is configured to heat the passive switch assembly 121 to the preset operating temperature when the active switch 11 is turned on. Specifically, during the charging of the battery cell 6, when the first controller 2 controls the active switch 11 to be turned off, the battery cell 6 is turned on with the charging apparatus 7 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 electric core 6 may perform normal charging operation. When the first controller 2 controls the active switch 11 to be turned on, a part of current or voltage of the charging device 7 enters the battery cell 6 through the switch 121, and the other part of current or voltage flows out through the second heating element 13, so that the current or voltage entering the battery cell 6 is greatly reduced, and meanwhile, after the current passes through the second heating element 13, the temperature of the second heating element 13 is sharply increased, so that the temperature of the passive switch assembly 121 reaches the preset action temperature, and thus the second heating element 13 can assist the passive switch assembly 121 to rapidly heat and turn off, and the charging device 7 is prevented from continuously charging the battery cell 6 with a larger current or voltage, thereby avoiding accidents occurring in the process of the battery cell 6, and also avoiding accidents such as explosion, spontaneous combustion and the like occurring due to an excessively large charging voltage of the battery cell 6. After the passive switch assembly 121 is turned off, a part of the current of the charging device 7 can return to the negative electrode of the charging device 7 through the second heating member 13 and the active switch 11, and the other part of the current enters the core pack battery cell 7 through the first heating member 122; since the first heat generating member 122 and the second heat generating member 13 are PTCs, a positive temperature coefficient resistor. When the action temperature is preset, namely the resistance value is obviously increased, under the condition that the voltage of external charging equipment is not changed, the current of the whole charging loop is reduced to 1-1 per mill before the action; the continuous energy input of the battery cell 6 is reduced, and the safety of the battery cell 6 is ensured; in addition, in the charging process of the battery electric core 6, the first heating element 122 may perform a voltage dividing function and the second heating element 13 may perform a shunting function, so as to prevent the over-charging phenomenon of the battery electric core 6.

Further, in the process of discharging the battery electric core 6, when the first controller 2 controls the active switch 11 to be turned off, the current of the battery electric core 6 directly flows into the electric equipment 8 through the passive switch assembly 121, and the first heat generating element 122 is short-circuited by the passive switch assembly 121, at this time, the battery electric core 6 may perform a normal discharging function. When the first controller 2 detects that the voltage of the battery electric core 6 is greater than the first preset voltage, or the current of the battery electric core 6 is greater than the first preset current, the first controller 2 controls the active switch 11 to be turned on, a part of the current or the voltage of the battery electric core 6 charges the electric equipment 8 through the passive switch assembly 121, and the other part of the current or the voltage passes through the second heating element 13; when the second heating element 13 is at normal temperature, the resistance value is very low, and the current flowing through the second heating element is very large, so that the second heating element 13 generates a large amount of heat; so that the temperature of the passive switch element 121 rises to the preset action temperature, and the passive switch element is turned off; then, current flows through the first heating part 122 and then enters the second heating part 13 and the electric equipment 8, both the first heating part 122 and the second heating part 13 are PTC resistors, the resistance values of the first heating part 122 and the second heating part 13 are increased after the temperature of the first heating part 122 and the second heating part 13 is increased, the flowing current is reduced, the external output power is reduced to 1 ‰, and meanwhile, the first heating part 122 divides voltage, so that the external voltage output is reduced; therefore, safety accidents such as explosion, spontaneous combustion and the like caused by the fact that the battery electric core 6 continuously supplies power to the electric equipment 8 with large voltage or current are avoided.

In one embodiment, the passive switch element 121 includes a first end, a second end and a bimetal, and when the passive switch element 121 is below a predetermined operating temperature, the first end and the second end are connected; when the passive switch assembly is above a preset action temperature, the first end and the second end are disconnected due to the fact that the deformation state of the bimetallic strip changes and spatial displacement occurs; the battery electric core 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 member 122 is connected between the first and second ends. As can be understood, the bimetallic strip is formed by overlapping metal sheets with different materials at two sides; when the temperature of the bimetallic strip rises, the bimetallic strip is deformed such as bending due to different thermal expansion coefficients of the two materials and different deformation amounts, when the first controller 2 controls the active switch 11 to be switched on and current passes through the second heating part 13, the action temperature of the bimetallic strip reaches the preset action temperature, the bimetallic strip is deformed and drives the input end and the output end to be disconnected, and at the moment, the battery electric core 6 is connected with the charging equipment 7 or the electric equipment 8 through the first heating part 122; and when the action temperature of the bimetallic strip is higher than the preset action temperature, the passive switch is kept in an off state. After the large current or the high voltage of the battery electric core 6 is removed, the first controller 2 controls the active switch 11 to be turned off, at this time, no current will pass through the second heating element 13, no current will pass through the first heating element 122, the temperature of the bimetal will be reduced to below the preset action temperature, the bimetal will recover to the original state, the first end and the second end are conducted, and at this time, the battery electric core 6 is communicated with the charging device 7 or the electric device 8 through the input end, the bimetal and the second end; and when the temperature of the bimetallic strip is lower than the preset action temperature, the passive switch is kept in a conducting state. In this embodiment, after the passive switch assembly 121 is operated, the first heat generating member 122 and the second heat generating member 13 can be restored to the original states, and the resistance of the passive switch is not changed, so that the passive switch assembly 121 can be reused.

In the related art of the present application, when the ambient temperature of the recoverable circuit breaker 12 reaches the preset action temperature of the recoverable circuit breaker 12, the passive switch assembly 121 can be turned off, so that the first end and the second end of the passive switch assembly 121 are turned off, and then the charge and discharge loop of the battery electric core 6 is turned off, thereby avoiding the safety risk of the battery when the ambient temperature is too high or the ambient temperature of the recoverable circuit breaker 12 is too high due to too high temperature of the battery. When the ambient temperature of the recoverable circuit breaker 12 changes to a temperature lower than the temperature at which the recoverable circuit breaker 12 acts, the recoverable circuit breaker 12 returns to a conducting state (that is, the first end and the second end are in contact conduction through the contact), so that the battery charging and discharging loop is closed. However, since the ambient temperature of the recoverable circuit breaker 12 is lower than the action temperature, but the battery still has a safety risk, and the recoverable circuit breaker 12 in the related art cannot effectively reduce the safety risk of the battery, the present disclosure proposes that the first controller 2 is used in cooperation with the active switch 11 and the second heating element 13, so that the recoverable circuit breaker 12 can accurately cut off the battery charging and discharging loop when the battery has a safety risk (that is, the first controller 2 is used to control the active switch 11 to be turned on, when a current flows through the second heating element 13, the heat emitted by the second heating element 13 assists the temperature of the battery circuit breaker 12 to rise to the preset action temperature, so that the recoverable circuit breaker 12 will be cut off), and the battery charging and discharging loop is recovered when the safety risk is removed (that when a high voltage or a large current contacts the charging and discharging loop of the battery cell 6, the first controller 2 controls the active switch 11 to be broken, the second heating element will not flow a current, the temperature of the battery circuit breaker 12 will fall below the preset action temperature, so that the recoverable circuit breaker 12 is closed, so that the battery has a high voltage or a safety accident such as an explosion of the battery can be caused, and the occurrence of an accident of the battery can be avoided, and the battery can be caused.

In an embodiment, as shown in fig. 4 and 5, the battery protection circuit further includes a charge protection switch 3 connected to the first controller 2, and the battery cell 6 is connected to a charging device 7 through the recoverable circuit breaker 12 and the charge protection switch 3 in sequence; it is to be understood that the charge protection switch 3 is a primary protection switch of the battery cell 6.

The first controller 2 is further configured to, when it is detected that the charging device 7 charges the battery electric core 6, if the recoverable circuit breaker 12 is turned on and the active switch 11 is turned off, and it is detected that the voltage of the battery electric core 6 is greater than a second preset voltage, control the charging protection switch 3 to be turned off, and continuously detect the voltage of the battery electric core 6; wherein the second preset voltage is less than the first preset voltage. It can be understood that the first preset voltage is a critical voltage for controlling the active switch 11 to be turned on or off in a charging process of the battery electric core 6, and generally refers to a voltage value of a safety voltage for charging the battery, and when the battery voltage reaches the safety voltage, the battery is prone to risks of explosion, fire and the like, thereby causing a safety accident. The second preset voltage is a critical voltage of the charging protection switch 3, which is generally a battery protection voltage charged by the battery electric core 6, when the charging voltage of the battery electric core 6 reaches a value higher than the battery protection voltage, the battery 6 can be normally charged without damaging the battery, but when the charging voltage of the battery electric core 6 is lower than the battery protection voltage, the battery electric core 6 may damage the service life thereof due to overcharging and the like. In the 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 stably charge the battery. Further, the second preset voltage can be set according to actual requirements. This application is through detecting when the voltage of battery 6 is greater than the second and predetermines voltage and be less than first predetermined voltage, the disconnection of first controller control charging protection switch 3 to avoid battery voltage to continue to rise, and harm battery life. Further, when the voltage of the battery electric core 6 is between the second preset voltage and the first preset voltage, the voltage of the battery electric core 6 may damage the battery electric core 6, but may not cause safety accidents such as explosion and spontaneous combustion of the battery electric core 6.

Specifically, in the process of charging the battery electric core 6, when the first controller 2 detects that the voltage of the battery electric core 6 is greater than a second preset voltage and less than a first preset voltage; at this time, if the charging device 7 continues to charge the battery electric core 6, the battery electric core 6 may have an accident that its service life is damaged due to an excessive voltage; therefore, the first controller 2 controls the charging protection switch 3 to be turned off, so that the charging device 7 will not charge the battery electric core 6, thereby avoiding the influence of the charging voltage on the service life of the battery electric core 6. Specifically, when the voltage of the battery cell 6 is less than the second preset voltage, the charging device 7 charges the battery cell 6 normally through the passive switch assembly 121 and the charge protection switch 3.

The first controller 2 is further configured to, when it is detected that the voltage of the battery electric core 6 is greater than or equal to the first preset voltage, control the active switch 11 to be turned on, so as to raise the action temperature of the recoverable circuit breaker 12 to a preset action temperature, and further turn off the recoverable circuit breaker 12, so as to disconnect the whole battery charging circuit, prevent the battery voltage from continuing to rise, and avoid risks such as fire and explosion of the battery. It is 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; the charging device 7 will thus continuously charge the battery cell 6, and the charging voltage of the battery cell 6 will continuously increase; when the first controller 2 detects that the charging voltage of the battery electric core 6 is greater than or equal to the first preset voltage, the first controller 2 controls the active switch 11 to be turned on; at this time, a part of current or voltage of the charging device 7 enters the battery electric core 6 through the passive switch assembly 121, another part of current or voltage flows out through the second heating element 13, the current flows through the second heating element 13 to enable the temperature of the second heating element 13 to sharply rise, so that the heat of the second heating element 13 enables the temperature of the passive switch assembly 121 to reach the preset operating temperature, and the passive switch assembly 121 is automatically turned off; after the passive switch assembly 121 is turned off, a part of the current of the charging device 7 flows through the first heat generating element 122 into the battery electric core 6, and the other part of the current flows out through the second heat generating element 13. Because the first heating element 121 and the second heating element 13 are PTC resistors, when current flows through the first heating element 121 and the second heating element 13, the first heating element 121 and the second heating element 13 can maintain the passive switch assembly in an off state, so that the first heating element 122 has the technical effects of voltage division and current limitation, and accidents such as spontaneous combustion and explosion caused by overlarge voltage of the battery are avoided.

In an embodiment, as shown in fig. 4 and 5, the battery protection circuit further includes a charge protection switch 3 connected to the first controller 2, and the battery electric core 6 is connected to a charging device 7 through the recoverable circuit breaker 12 and the charge protection switch 3 in sequence.

The first controller 2 is further configured to, when it is detected that the charging device 7 charges the battery electric core 6, control the charging protection switch 3 to turn off if the recoverable circuit breaker 12 is turned on and the active switch 11 is turned off, and when it is detected that the current of the battery electric core 6 is greater than or equal to a second preset current and less than a first preset current, and continuously detect the current of the battery electric core 6. It can be understood that the first preset current is a critical current for controlling the active switch 11 to be turned on or off in the charging process of the battery electric core 6, and generally refers to a current value of a safety current for charging the battery, and when the charging current of the battery reaches the safety current, the battery is prone to risks such as explosion and fire, and further causes a safety accident. The second preset current is a critical current for the charging protection switch 3 to be turned off or turned on during the charging process of the battery electric core 6, and the second preset current may be set according to actual requirements, generally referred to as a battery protection current for battery charging. Further, the second preset current can be set according to actual requirements. This application is through detecting when the charging current of battery 6 is greater than the second and predetermines electric current and be less than first predetermined electric current, the disconnection of charging protection switch 3 is controlled to first controller to avoid battery current to continue to rise, and harm battery life. Further, when the charging current of the battery electric core 6 is between the second preset current and the first preset current, the current of the battery electric core 6 may cause the damage of the battery electric core 6, but may not cause safety accidents such as explosion and spontaneous combustion of the battery electric core 6.

Specifically, in the process of charging the battery electric core 6, when the first controller 2 detects that the current of the battery electric core 6 is greater than a second preset current and less than the first preset current; at this time, if the charging device 7 continues to charge the battery electric core 6, the battery electric core 6 may damage the service life accident due to the excessive charging current; therefore, the first controller 2 controls the charging protection switch 3 to be turned off, so that the charging device 7 will not charge the battery electric core 6, thereby avoiding the influence of the charging voltage on the service life of the battery electric core 6. Specifically, when the charging current of the battery cell 6 is smaller 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 further configured to control the active switch 11 to be turned on when detecting that the current of the battery electric core 6 is greater than or equal to the first preset current, so as to raise the action temperature of the recoverable circuit breaker 12 to a preset action temperature, and further disconnect the recoverable circuit breaker 12, so as to disconnect the whole battery charging circuit, prevent the battery current from continuing to rise, and avoid risks such as fire and explosion of the battery. It is 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; the charging device 7 will thus continuously charge the battery electric core 6, and the charging current of the battery will continuously increase; the first controller 2 controls the active switch 11 to be turned on; at this time, a part of current or voltage of the charging device 7 enters the battery electric core 6 through the passive switch assembly 121, another part of current or voltage flows out through the second heating element 13, the current flows through the second heating element 13 to enable the temperature of the second heating element 13 to sharply rise, so that the heat of the second heating element 13 enables the temperature of the passive switch assembly 121 to reach the preset operating temperature, and the passive switch assembly 121 is automatically turned off; after the passive switch is turned off, a part of the current of the charging device 7 flows through the first heat generating element 122 into the battery electric core 6, and the other part of the current flows out through the second heat generating element 13. Because the first heating element 121 and the second heating element 13 are PTC resistors, when current flows through the first heating element 121 and the second heating element 13, the passive switch assembly can be maintained in an off state by the first heating element 121 and the second heating element 13, so that the first heating element 122 has a shunting technical effect, and accidents such as spontaneous combustion and explosion caused by excessive current of the battery voltage are avoided. And because after the passive switch assembly 121 is disconnected, the first heating element 122 and the second heating element 13 can always keep the passive switch assembly 121 disconnected, thereby improving the safety of the battery, avoiding the charging current of the battery from continuously rising, and reducing the risk of the battery being on fire or even exploding.

In an embodiment, as shown in fig. 4 and 5, the battery protection circuit further includes a discharge protection switch 4 connected to the first controller 2, and the battery electric core 6 is connected to an electric device 8 through the recoverable circuit breaker 12 and the discharge protection switch 4 in sequence; it is understood that the discharge protection switch 4 is a primary protection switch of the battery cell 6.

The first controller 2 is further configured to, when it is detected that the battery electric core 6 discharges the electric equipment 8, control the discharge protection switch 4 to be turned off and continuously detect the current of the battery electric core 6 if the recoverable circuit breaker 12 is turned on and the active switch 11 is turned off, and the voltage of the battery electric core 6 is smaller than a third preset voltage; wherein the third preset voltage is less than the first preset voltage; it can be understood that the third preset voltage is a critical voltage at which the first controller 2 controls the discharge protection switch 4 to be turned on or off in a discharge process of the battery electric core 6; generally, the discharge voltage of the battery cell 6 is the battery protection voltage, and when the discharge voltage of the battery cell 6 is higher than a third preset voltage and lower than the first preset voltage, the normal discharge of the battery 6 can be ensured, and the battery is not damaged; however, if the discharge voltage of the battery cell 6 is lower than the second preset voltage, the battery cell 6 may be discharged excessively to damage the service life thereof. The discharge protection switch 4 and the passive switch assembly 121 are in a normally closed state, and the active switch 11 is in a normally open state; that is, in the normal discharging process of the battery electric core 6, the discharge protection switch 4 and the passive switch assembly 121 are in the on state, and the active switch 11 is in the off state. Further, the third preset voltage may be set according to actual requirements; the battery cell 6 is normally discharged at a constant current or constant power. This application is through detecting battery 6's discharge voltage is less than when the third presets voltage, control discharge protection switch 4 disconnection to avoid battery voltage to continue to reduce, and harm battery life.

Specifically, in the process of discharging the battery cell 6, when the first controller 2 detects that the voltage of the battery cell 6 is greater than a third preset voltage; at this time, if the battery electric core 6 continuously discharges the electric equipment 8, the battery electric core 6 may have accidents such as bulge and liquid leakage; at this moment, the first controller 2 controls the discharge protection switch 4 to be turned off, so that the battery electric core 6 cannot discharge the electric equipment 8, and the phenomena of bulging and liquid leakage caused by over-low voltage of the battery electric core 6 due to continuous discharge are avoided. Specifically, when the voltage of the battery electric core 6 is smaller than the third preset voltage, the battery electric core 6 discharges the electric device 8 normally through the passive switch and the discharge protection switch 4.

The first controller 2 is further configured to control the active switch 11 to be turned on when detecting that the current of the battery electric core 6 is greater than or equal to the first preset current, so as to raise the action temperature of the recoverable circuit breaker 12 to a preset action temperature, and further disconnect the recoverable circuit breaker 12, so that a whole battery discharge loop is disconnected, the battery is prevented from continuing large-current discharge, and risks such as fire and explosion of the battery are avoided. It is understood that when the first controller 2 controls the discharge protection switch 4 to be turned off, the discharge protection switch 4 is not actually turned off; as a result, the battery cell 6 will continuously discharge the electrical equipment 8 with a large current, and the voltage of the battery cell 6 will continuously decrease; when the first controller 2 detects that the current of the battery electric core 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 electric core 6 enters the electric equipment 8 through the passive switch assembly 121, and the other part of the current flows out through the passive switch assembly 122 and the second heating element 13; then, current flows through the passive switch assembly 122 and the second heat generating component 13, so that the temperatures of the first heat generating component 122 and the second heat generating component 13 will rise, and the operating temperature of the passive switch assembly 121 reaches the preset operating temperature, and the passive switch assembly 121 automatically turns off; after the passive switch assembly 121 is automatically turned off, a part of the current of the battery cell 6 flows into the electrical equipment 8 through the first heat generating part 122, and another part of the current flows back to the battery cell through the first heat generating part 122 and the second heat generating part 13, so that accidents such as explosion and spontaneous combustion caused by the fact that the battery cell 6 continuously discharges electricity to the electrical equipment 8 with a large current are avoided.

In an 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 electric core 6 is connected to an electric device 8 through the recoverable circuit breaker 12 and the discharge protection switch 4 in sequence.

The first controller 2 is further configured to, when it is detected that the battery electric core 6 discharges the electric equipment 8, control the discharge protection switch 4 to be turned off and continuously detect the current of the battery electric core 6 if the recoverable circuit breaker 12 is turned on and the active switch 11 is turned off, and the current of the battery electric core 6 is greater than a third preset current; the third preset current is smaller than the first preset current; as can be understood, the third preset current is a 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 electric core 6; the discharge current of the battery cell 6 is below the battery protection current, so that the battery 6 can be ensured to be normally discharged without damaging the battery; however, when the discharge current of the battery cell 6 is higher than the battery protection current, the battery cell 6 may discharge due to an excessive current, and the service life of the battery cell 6 may be damaged. The first preset current is a critical current for controlling the active switch 11 to be switched on or off in the discharging process of the battery electric core 6 by the first controller; generally, the current value of the safety current of the battery discharge is referred to, and when the battery discharge current is higher than the safety current, the battery is easy to have risks such as explosion, fire and the like, and further safety accidents are caused. And the third preset current can be set according to actual requirements. This application is through detecting when the discharge current of battery 6 is greater than the third and predetermines electric current and be less than first predetermined electric current, the disconnection of first controller control discharge protection switch 4 to avoid the discharge current of battery to continue to rise, and harm battery life-span. Further, when the discharge current of the battery electric core 6 is between the third preset current and the first preset current, the discharge current of the battery electric core 6 may cause damage to the battery electric core 6, but may not cause safety accidents such as explosion and spontaneous combustion of the battery electric core 6.

Specifically, in the process of discharging the battery electric core 6, when the first controller 2 detects that the current of the battery electric core 6 is greater than a third preset current and less than the first preset current; at this time, if the battery cell 6 continues to discharge the electric equipment 8 at a high current, the battery cell 6 may damage the service life thereof due to an excessive discharge current; therefore, the first controller 2 controls the discharge protection switch 4 to be turned off, so that the battery cell 6 does not discharge the electric equipment 8, and the service life of the battery cell 6 is prevented from being influenced by an excessive discharge current.

The first controller 2 is further configured to control the active switch 11 to be turned on when detecting that the current of the battery electric core 6 is greater than or equal to the first preset current, so as to raise the action temperature of the recoverable circuit breaker 12 to a preset action temperature, and further disconnect the recoverable circuit breaker 12, so that a whole battery discharge loop is disconnected, the battery is prevented from continuing large-current discharge, and risks such as fire and explosion of the battery are avoided. It is understood that when the first controller 2 controls the discharge protection switch 4 to be turned off, the discharge protection switch 4 is not actually turned off; therefore, the battery cell 6 continuously discharges the electric equipment 8 with a large current, the battery cell 6 continues to generate power, 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 equipment 8 through the passive switch assembly 121, and another part of the current returns to the negative electrode of the battery cell 6 through the first heating element 122 and the second heating element 13; thereafter, current flows through the first heating element 122 and the second heating element 13, so that the heat of the first heating element 122 and the second heating element 13 will make the operating temperature of the passive switch assembly 121 reach the preset operating temperature, and further drive the passive switch assembly 121 to be turned off; after the passive switch assembly 121 is turned off, a part of the current of the battery cell 6 flows into the electrical equipment 8 through the first heat generating part 122, and another part of the current flows back to the battery cell through the first heat generating part 122 and the second heat generating part 13, so that accidents such as explosion and spontaneous combustion caused by the fact that the battery cell 6 continuously discharges to the electrical equipment 8 with a large current are avoided.

In an embodiment, as shown in fig. 4 and 5, the battery cell 6 is connected to a charging device 7 through the recoverable circuit breaker 12; the battery protection circuit further comprises a second controller 5, and the second controller 5 is connected with the battery electric core 6 and the active switch 11; it is understood that the second controller 5 and the first controller 2 can both control the active switch 11 to be turned on and off.

The second controller 5 is configured to control the active switch 11 to be turned on when detecting that the voltage of the battery electric core 6 is greater than or equal to a preset limit voltage; wherein the limit preset voltage is greater than the first preset voltage. It can be understood that the limit preset voltage is a critical voltage for controlling the active switch 11 to be turned on or off in the process of charging the battery electric core 6, and generally refers to a limit voltage for charging a battery, and after the battery voltage reaches the limit voltage, the battery is very prone to risks of explosion, fire and the like, thereby causing a safety accident. It should be noted that the limit preset voltage is greater than the first preset voltage, the first preset voltage is greater than the second preset voltage, and the second preset voltage is a critical voltage for turning on or off the charge protection switch 3, which is generally referred to as a battery protection voltage for battery charging, in the process of charging the battery electric core 6, the first controller 2 controls the charge protection switch 3 (that is, when the charge electric core is below the second preset voltage, the battery can perform normal charging operation without damaging the service life of the battery; the first preset voltage is a critical voltage for controlling the active switch 11 to be turned on or off in a charging process of the battery electric core 6, and generally refers to a safety voltage for charging the battery (that is, when the charging electric core is above the first preset voltage, the battery is prone to accidents such as explosion and spontaneous combustion due to an excessively high charging voltage). Further, when the charging voltage of the battery is greater than the limit preset voltage, the probability of accidents such as explosion, spontaneous combustion and the like of the battery is high, and when the charging voltage of the battery is between the first preset voltage and the limit preset voltage, the battery explodes. 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 can be damaged during charging, and safety accidents such as explosion, spontaneous combustion and the like can be avoided; or the probability of safety accidents such as explosion, spontaneous combustion and the like is low; when the charging voltage of the battery is below the second preset voltage, the battery can perform normal charging operation. Specifically, in the process that the charging device 7 charges the battery electric core 6, when the first controller 2 detects that the voltage of the battery electric core 6 is greater than a first preset voltage, the first controller 2 turns on the first active switch 11, so that the first heating element 122 has the technical effects of voltage division and current limitation, and accidents such as spontaneous combustion and explosion of the battery electric core 6 due to overhigh voltage are avoided; if the first controller 2 is in fault or the like, when the voltage of the battery electric core 6 is greater than or equal to the first preset voltage, the active switch 11 is not turned on; at this time, the voltage of the battery electric core 6 is further increased, and when the second controller 5 detects that the voltage of the battery electric core 6 is greater than or equal to the limit preset voltage, the second controller 5 controls the active switch 11 to be turned on, so that the first heating element 122 and the second heating element 13 are both connected to the charging circuit of the battery electric core 6, and further accidents such as spontaneous combustion and explosion caused by the excessively high voltage of the battery electric core 6 can be avoided.

Further, each battery pack is composed of a plurality of battery electric cores 6, and each battery electric core 6 shares a part of the total voltage of the charging device 7; in the process of assembling the battery pack, when a voltage signal of one or more battery electric cores 6 in the battery pack is broken, due to detection reasons inside the first controller 2, a voltage value detected by the first controller 2 is higher than an actual electric core voltage value, and a malfunction occurs, 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 switched on, so that the recoverable circuit breaker 12 is connected in the recoverable battery protection circuit, and when the voltage of the battery electric cores is too high, the recoverable circuit breaker 12 can cause the passive switch to be switched off, so that the voltage of the battery electric cores 6 is continuously increased; because the recoverable breaker 12 is used, it can be recovered after its connection is normal without damaging the battery pack.

It should be noted that, in the battery protection circuit shown in fig. 3, the charge protection switch 3 and the discharge protection switch 4 are primary protection switches of a battery pack, the resettable circuit-breaking control circuit 1 is a secondary protection switch of the battery pack, and in addition, a tertiary protection switch needs to be designed for each battery electric core 6. In the embodiment shown in fig. 4, one of the three-level protection switches is the recoverable breaker control circuit 1, and the recoverable breaker control circuit 1 can perform the functions of the three-level protection switch and the secondary protection switch, so that one secondary protection switch is omitted in the battery protection circuit, and the problems of space layout tension, thermal reaction concentration and the like of the battery protection circuit are reduced.

Another embodiment of the present invention further provides a battery pack, which includes a battery and the battery protection circuit. As can be understood, the battery may be provided with a plurality of battery cells 6 according to actual requirements.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

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;

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;

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;

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;

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;

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