Lightning protection battery pack and automobile

Abstract

The utility model discloses a lightning protection battery pack and an automobile. The lightning protection battery pack comprises an external interface, a battery pack, a battery pack circuit breaking module, a battery management system and a lightning protection module. The external interface is externally connected with an electric appliance and a charging circuit; the lightning protection module and the battery pack circuit breaking module are sequentially arranged on a charging and discharging loop between the external interface and the battery pack; the lightning protection module is also connected with a grounding end; and the battery management system is respectively connected with the lightning protection module and the battery pack circuit breaking module. On one hand, the processed electric signal is transmitted to the rear-stage battery pack, on the other hand, the generated lightning stroke signal is fed back to the battery management system, and the battery management system controls the on-off of the battery pack circuit breaking module according to the lightning stroke signal, thereby realizing the disconnection between the battery pack and the external interface under the lightning stroke condition, and preventing the damage of the abnormal electric signal to the battery pack. And the lightning protection reliability of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to energy storage technology, in particular to a lightning protection battery pack and a car. Background Art

[0002] With the development of energy storage technology, the performance of energy storage equipment has been continuously improved, and energy storage equipment has been applied to various industries. With the expansion of application scenarios, the possibility of energy storage equipment being struck by lightning has also greatly increased.

[0003] In order to prevent the battery pack from being damaged by lightning, the prior art connects a lightning protection device to the interface of the battery pack to guide the lightning transmitted to the battery pack into the ground to prevent damage to the battery pack. However, the reliability of such lightning protection method is not high. Utility Model Content

[0004] The utility model provides a lightning protection battery pack and a car, so as to improve the lightning protection reliability of the battery pack.

[0005] According to one aspect of the utility model, a lightning protection battery pack is provided, the lightning protection battery pack comprising: an external interface, a battery pack, a battery pack disconnecting module, a battery management system and a lightning protection module;

[0006] The external interface is connected to external electrical appliances and a charging circuit; the lightning protection module and the battery pack circuit breaker module are sequentially arranged on the charging and discharging circuit between the external interface and the battery pack; the lightning protection module is also connected to the ground terminal; the battery management system is respectively connected to the lightning protection module and the battery pack circuit breaker module.

[0007] Optionally, the lightning protection battery pack also includes a battery shell, the external interface is arranged on the battery shell, and the battery group, the battery pack circuit breaker module, the battery management system and the lightning protection module are all fixed in a cavity formed by the battery shell.

[0008] Optionally, the battery casing is also externally connected to the ground terminal, and the lightning protection module is grounded by being connected to the battery casing.

[0009] Optionally, the battery management system and the lightning protection module are respectively fixed to a first surface of the battery pack circuit breaker module, and a second surface of the battery pack circuit breaker module is fixed to an inner wall of the battery housing.

[0010] Optionally, the battery pack includes a power supply assembly and a plurality of battery cells.

[0011] Optionally, the battery management system is also connected to the power supply assembly.

[0012] Optionally, the lightning protection module includes a pulse suppression circuit.

[0013] Optionally, the external interface includes an external positive electrode and an external negative electrode; the battery pack disconnect module includes a positive access terminal and a negative access terminal;

[0014] The pulse suppression circuit includes a gas discharge tube, a first thermistor, a second thermistor, a clamping circuit, a first voltage sensor and a second voltage sensor; the gas discharge tube is connected between the external positive electrode and the external negative electrode, and the gas discharge tube is also connected to the ground terminal; the first thermistor and the first voltage sensor are connected between the external positive electrode and the positive access terminal in sequence, and the signal output terminal of the first voltage sensor is connected to the battery management system; the second thermistor and the second voltage sensor are connected between the external negative electrode and the negative access terminal in sequence, and the signal output terminal of the second voltage sensor is connected to the battery management system; the first connection point between the first thermistor and the first voltage sensor is connected to one end of the clamping circuit, and the second connection point between the second thermistor and the second voltage sensor is connected to the other end of the clamping circuit, wherein the clamping voltage provided by the clamping circuit is not higher than the preset safety voltage of the battery pack.

[0015] Optionally, the clamping circuit includes a first transient suppression diode, the first transient suppression diode is connected between the first connection point and the second connection point, the first transient suppression diode provides a first clamping voltage, and the first clamping voltage is not higher than the preset safety voltage of the battery pack;

[0016] The clamping circuit also includes a second transient suppression diode and a third transient suppression diode, the second transient suppression diode and the third transient suppression diode are reversely connected in series between the first connection point and the second connection point, and the reverse series combination of the second transient suppression diode and the third transient suppression diode provides a second clamping voltage, and the second clamping voltage is higher than the clamping voltage of the first transient suppression diode and is not higher than a preset safety voltage of the battery pack.

[0017] According to another aspect of the present invention, a car is provided, comprising: an electrical appliance, a charging circuit and any lightning protection battery pack described in the first aspect.

[0018] The technical solution of the embodiment of the utility model is that the lightning protection battery pack includes an external interface, a battery pack, a battery pack circuit breaker module, a battery management system and a lightning protection module. Different from the traditional lightning protection module which is only arranged at the interface of the protected electrical equipment, the lightning protection module is not only arranged between the external interface and the battery pack circuit breaker module, but also connected to the battery management system. The lightning protection module can capture, suppress and convert abnormal waveforms in the connected electrical signals. On the one hand, it transmits the processed electrical signals to the subsequent battery pack, and on the other hand, the generated lightning strike signal is fed back to the battery management system. The battery management system controls the on and off of the battery pack circuit breaker module according to the lightning strike signal, realizes the disconnection between the battery pack and the external interface in the case of lightning strike, prevents the abnormal electrical signal from damaging the battery pack, and improves the lightning protection reliability of the battery pack.

[0019] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the composition of a lightning protection battery pack provided by an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the partial structure of another lightning protection battery pack provided by an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the composition of another lightning protection battery pack provided in an embodiment of the utility model;

[0024] Figure 4 A schematic diagram of the composition of a car provided by an embodiment of the utility model;

[0025] Figure 5 A schematic diagram of another automobile provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] In order to solve the problems mentioned in the background technology, the utility model proposes a lightning protection battery pack. Figure 1 A schematic diagram of a lightning protection battery pack provided by the present utility model, referring to Figure 1 The lightning protection battery pack 100 includes an external interface 101, a battery pack 102, a battery pack disconnecting module 103, a battery management system 104 and a lightning protection module 105. The external interface 101 is connected to an external electrical appliance and a charging circuit; the lightning protection module 105 and the battery pack disconnecting module 103 are sequentially arranged on the charging and discharging circuit between the external interface 101 and the battery pack 102; the lightning protection module 105 is also connected to the ground terminal GND; the battery management system 104 is respectively connected to the lightning protection module 105 and the battery pack disconnecting module 103.

[0029] Specifically, the external interface 101 refers to an interface component on the battery pack that is connected to an external electrical appliance and / or a charging circuit, and can realize electrical connection and communication connection between the electrical appliance and / or the charging circuit and the battery pack. Exemplarily, the external interface 101 may include a charging terminal, a discharging terminal, and a communication terminal. The battery pack 102 refers to an energy storage battery component that can store and provide electrical energy. The battery pack 102 may include a plurality of single cells connected in series. Exemplarily, the battery pack 102 may include a plurality of lithium-ion batteries connected in series and their surrounding functional circuits, wherein the functional circuit may include at least a balancing circuit, a sensing circuit, and a power conversion circuit.

[0030] The battery pack disconnect module 103 (also called BDU) is a collection of disconnect devices for each power supply and charging circuit in the battery pack. The battery pack disconnect module 103 is provided with a controllable switch device that can control the on and off of the external power supply circuit, charging circuit and internal power supply circuit of the battery pack 102. One side of the battery pack disconnect module 103 is connected to the output end of the battery pack 102, and the other side is connected to the external interface 101 through the lightning protection module 105. The control end of the battery pack disconnect module 103 is also connected to the battery management system 104. The controllable switch device in the battery pack disconnect module 103 controls the on and off of the line according to the communication signal sent by the battery management system 104.

[0031] The lightning protection module 105 is a lightning identification, analysis and conversion component in the battery pack. The lightning protection module 105 in the present application is arranged between the external interface 101 and the battery pack circuit breaker module 103, and is also connected to the battery management system 104. In the case where the battery pack, the electrical equipment connected to the battery pack or the charging equipment is struck by lightning, the lightning protection module 105 can use the pulse suppression circuit to capture and analyze the abnormal electrical signal connected through the external interface 101, and convert the abnormal electrical signal into an electrical signal with lower energy, thereby reducing the damage of the abnormal electrical signal to the subsequent battery pack 102. The lightning protection module 105 is also connected to the battery management system 104, and generates a lightning strike signal according to the voltage level of the received abnormal electrical signal, and feeds it back to the battery management system 104. The battery management system 104 determines the intensity of the lightning strike based on the received lightning strike signal and then generates a control signal, which controls the working state of the battery pack circuit breaker module 103 accordingly, thereby realizing circuit breaker protection for the battery pack 102 and its surrounding circuits. Since the technical solution of the battery management system 104 sending a corresponding control signal according to the signal strength is a prior art, it will not be described in detail here.

[0032] The lightning protection battery pack provided in this embodiment includes an external interface, a battery pack, a battery pack circuit breaker module, a battery management system and a lightning protection module. Different from the traditional lightning protection module which is only arranged at the interface of the protected electrical equipment, the lightning protection module is not only arranged between the external interface and the battery pack circuit breaker module, but also connected to the battery management system. The lightning protection module can capture, suppress and convert the abnormal waveform in the connected electrical signal. On the one hand, it transmits the processed electrical signal to the subsequent battery pack, and on the other hand, the generated lightning signal is fed back to the battery management system. The battery management system controls the on and off of the battery pack circuit breaker module according to the lightning signal, realizes the disconnection between the battery pack and the external interface in the case of lightning strike, prevents the abnormal electrical signal from damaging the battery pack, and improves the lightning protection reliability of the battery pack.

[0033] Optionally, Figure 2 A partial structural diagram of another lightning protection battery pack provided by an embodiment of the utility model, Figure 2In order to facilitate observation of the situation in the battery housing cavity, the upper cover of the battery housing is hidden. Figure 2 The lightning protection battery pack 100 also includes a battery shell 201, the external interface 101 is arranged on the battery shell 201, and the battery group 102, the battery pack circuit breaker module 103, the battery management system 104 and the lightning protection module 105 are all fixed in the cavity formed by the battery shell 201.

[0034] Specifically, the battery housing 201 refers to the protective housing of the battery pack, and the battery housing 201 can be a hard plastic housing. The battery pack 102, the battery pack circuit breaker module 103, the battery management system 104, and the connecting wires therebetween are all arranged in the cavity of the battery housing 201. For example, the second surface of the battery pack circuit breaker module 103 is fixed to the inner wall of the battery housing 201, and the battery management system 104 and the lightning protection module 105 are respectively fixed to the first surface of the battery pack circuit breaker module 103. On the one hand, the fixed setting can improve the stability of the battery pack, and on the other hand, the battery management system 104 and the lightning protection module 105 are respectively fixed to the first surface of the battery pack circuit breaker module 103, which improves the integration of the battery pack and reduces the external volume of the battery pack on the basis of reducing the use of the wiring harness. The battery pack 102 includes a plurality of battery cells connected in series and a power supply assembly. The battery cells can be arranged in sequence and fixed together with the power supply assembly on the inner wall of the battery housing 201. The power supply assembly can include a battery cell status sensing assembly, a series quantity switching assembly and a voltage balancing assembly. The power supply assembly is connected to the battery management system 104 and can report the working status of the battery cells to the battery management system 104, and control the working mode of the battery pack according to the management signal of the battery management system 104.

[0035] The external interface 101 can be arranged on the battery housing 201 to be connected internally and externally, so as to realize the connection between the battery pack and the external charging, power circuit and communication line. For example, the battery housing 201 is also externally connected to the ground terminal, and the lightning protection module 105 is connected to the battery housing 201 to complete the grounding. For example, on the one hand, a grounding terminal can be arranged on the battery housing 201, and the grounding terminal is externally connected to the ground terminal and internally connected to the lightning protection module 105 to realize the grounding of the lightning protection module 105; on the other hand, when the battery housing 201 is made of metal, the metal housing is externally connected to the ground terminal and internally connected to the lightning protection module 105 to realize the double grounding of the lightning protection module 105 and the metal housing.

[0036] The lightning protection module 105 may include a pulse suppression circuit, which can capture and analyze abnormal waveforms in the electrical signal connected to the external interface 101, and convert the abnormal waveforms into a form with lower energy, so as to reduce the damage of lightning to the battery pack 102. The pulse suppression circuit can also generate a corresponding lightning signal after conversion to achieve communication with the battery management system 104. Exemplarily, the pulse suppression circuit may include at least one of a voltage regulator protection circuit and a transient voltage suppressor.

[0037] Exemplarily, the battery management system 104 determines the strength level of the lightning strike based on the lightning strike signal uploaded by the lightning protection module 105. In the case of a high lightning strike level, the battery management system 104 can control all switch devices in the battery pack circuit breaker module 103 to disconnect and stop all power supply. In the case of a medium lightning strike level, the battery management system 104 can reduce the power supply of the battery pack 102 to reduce the risk of lightning strikes. In the case of a weak lightning strike level. The battery management system 104 controls the battery pack circuit breaker module 103 and the battery pack 102 to operate normally. The lightning protection module 105 is connected to the battery management system 104 for communication. Unlike the lightning protection module 105, which is only connected to the charging and discharging circuit of the battery pack 102, it can feed back the processed signal of the abnormal electrical signal as a lightning strike signal to the battery management system 104, thereby controlling the on and off of the charging and discharging circuit connected to the battery pack circuit breaker module 103. On the basis of suppressing abnormal waveforms to prevent electric shocks from affecting the battery pack 102, a protective measure for disconnecting the line is added, thereby improving the reliability of the lightning protection battery pack 100.

[0038] The lightning protection battery pack provided in this embodiment also includes a battery shell, and the external interface is arranged on the battery shell. The battery pack, the battery pack circuit breaker module, the battery management system and the lightning protection module are all fixed in the cavity formed by the battery shell. The battery shell is also externally connected to the ground terminal, and the lightning protection module is grounded by connecting to the battery shell. The battery management system and the lightning protection module are respectively fixed to the first surface of the battery pack circuit breaker module, and the second surface of the battery pack circuit breaker module is fixed to the inner wall of the battery shell. The setting of the battery shell protects the internal circuit, and the internal circuit is fixed inside the battery shell, which further improves the power supply reliability of the battery pack.

[0039] Optionally, Figure 3 A schematic diagram of another lightning protection battery pack provided by an embodiment of the present invention, referring to Figure 3On the basis of the above-mentioned embodiment, in the lightning protection battery pack 100, the external interface 101 includes an external positive electrode A+ and an external negative electrode A-; the battery pack circuit breaker module 103 includes a positive access terminal B+ and a negative access terminal B-; the pulse suppression circuit 107 in the lightning protection module (only the pulse suppression circuit is exemplarily shown in the figure) may include a gas discharge tube C, a first thermistor D1, a second thermistor D2, a clamping circuit 106, a first voltage sensor E1 and a second voltage sensor E2; the gas discharge tube C is connected between the external positive electrode A+ and the external negative electrode A-, and the gas discharge tube C is also connected to the ground terminal GND; the first thermistor D1 and the first voltage sensor E1 are connected in sequence The first voltage sensor E1 is connected between the external positive electrode A+ and the positive access terminal B+, and the signal output end of the first voltage sensor E1 is connected to the battery management system 104; the second thermistor D2 and the second voltage sensor E2 are connected between the external negative electrode A- and the negative access terminal B- in sequence, and the signal output end of the second voltage sensor E2 is connected to the battery management system 104; the first connection point between the first thermistor D1 and the first voltage sensor E1 is connected to one end of the clamping circuit 106, and the second connection point between the second thermistor D2 and the second voltage sensor E2 is connected to the other end of the clamping circuit 106, wherein the clamping voltage provided by the clamping circuit 106 is not higher than the preset safety voltage of the battery pack 102.

[0040] Specifically, the first thermistor D1 and the second thermistor D2 respectively control the circuit to be shut down when the voltage at both ends or the current flowing through them exceeds the safety upper limit of the battery pack, and restore the circuit to be turned on after the voltage at both ends and the current flowing through them recover to below the safety upper limit. When the circuit where the thermistor is located is shut down, the gas discharge tube C releases abnormal current to the ground terminal GND. The clamping circuit 106 is a circuit that clamps the voltage at both ends (between the first connection point and the second connection point) to a preset voltage level. Exemplarily, it can include multiple transient suppression diodes with different clamping voltage levels. The first voltage sensor E1 and the second voltage sensor E2 can detect the voltage level of their circuits relative to the ground terminal, and generate a voltage signal to upload to the battery management system 104.

[0041] Exemplarily, the clamping circuit 106 may include a first transient suppression diode T1, which is connected between the first connection point and the second connection point, and the first transient suppression diode T1 provides a first clamping voltage, which is not higher than the preset safety voltage of the battery pack 102. The clamping circuit 106 also includes a second transient suppression diode T2 and a third transient suppression diode T3, which are reversely connected in series between the first connection point and the second connection point, and the reverse series combination of the second transient suppression diode T2 and the third transient suppression diode T3 provides a second clamping voltage, which is higher than the clamping voltage of the first transient suppression diode T1 and is not higher than the preset safety voltage of the battery pack 102. The clamping circuit 106 includes two clamping parallel branches, which can set two clamping barriers of different voltage levels. In the event of a failure of the first transient suppression diode T1, the reverse series combination of the second transient suppression diode T2 and the third transient suppression diode T3 can provide a clamping of a higher voltage level, thereby improving the reliability of the lightning protection module. In addition, thermistors and voltage sensors are dually set on the positive and negative lines, which can prevent lightning from entering through the positive pole as well as the negative pole, further improving the reliability of the lightning protection module.

[0042] The utility model further provides a car, Figure 4 A schematic diagram of a vehicle provided in an embodiment of the utility model, based on the above-mentioned embodiment, referring to Figure 4 The automobile 300 includes electrical appliances 301, a charging circuit 302 and any of the aforementioned lightning protection battery packs 100, wherein the electrical appliances 301 may include the power motor, lighting indication equipment, audio and video equipment, on-board computers and any other on-board electrical appliances of the automobile 300; the charging circuit 302 is a circuit component for charging the battery pack, which can receive the electrical energy connected by the charging gun to realize the charging of the battery pack.

[0043] Optionally, Figure 5 A schematic diagram of another automobile provided by an embodiment of the utility model, based on the above embodiment, referring to Figure 5 The electrical appliance 301 includes a vehicle computer 401, and the battery management system in the lightning protection battery pack 100 is also communicatively connected to the vehicle computer 401 (the figure only schematically shows the connection relationship, and does not distinguish between communication connection and electrical connection).

[0044] Specifically, the driving computer 401, also known as ECU, is the master controller of the whole vehicle. The battery management system in the lightning protection battery pack 100 is connected to the driving computer in communication, and can upload lightning strike signals and corresponding control signals to the driving computer. The communication connection between the driving computer and the battery management system can realize the signal upload of lightning strikes and the early warning of power outages, which is convenient for the driving computer 401 to reasonably arrange the operating status of other on-board equipment and improve the safety of the car 300. For example, the driving computer 401 can control the opening of the clearance lights and the gradual deceleration of the power motor before the lightning strike level is high and the battery pack stops supplying power to the outside, so as to reduce the impact of subsequent power outages on driving. On the basis of the above-mentioned embodiment, optionally, the electrical appliance 301 can also include a human-computer interaction device 402, which is connected to the driving computer 401 in communication. For example, the human-computer interaction device 402 can include at least one of a touch screen and an interactive speaker, which can realize a reminder to the driver before being struck by lightning and power outages, and further improve the safety of the car 300 in thunder and lightning weather.

[0045] The utility model proposes a lightning protection battery pack and a car, wherein the lightning protection battery pack includes an external interface, a battery pack, a battery pack circuit breaker module, a battery management system and a lightning protection module. Different from the traditional lightning protection module which is only arranged at the interface of the protected electrical equipment, the lightning protection module is not only arranged between the external interface and the battery pack circuit breaker module, but also connected to the battery management system. The lightning protection module can capture, suppress and convert abnormal waveforms in the connected electrical signals, transmit the processed electrical signals to the subsequent battery packs on the one hand, and feed back the generated lightning strike signals to the battery management system on the other hand. The battery management system controls the on and off of the battery pack circuit breaker module according to the lightning strike signals, realizes the disconnection between the battery pack and the external interface in the case of lightning strikes, prevents the abnormal electrical signals from damaging the battery pack, and improves the lightning protection reliability of the battery pack and the car in which it is located.

[0046] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A lightning protection battery pack, characterized in that: include: External interface, battery pack, battery pack circuit breaker module, battery management system and lightning protection module; The external interface is connected to external electrical appliances and a charging circuit; the lightning protection module and the battery pack circuit breaker module are sequentially arranged on the charging and discharging circuit between the external interface and the battery pack; the lightning protection module is also connected to the ground terminal; the battery management system is respectively connected to the lightning protection module and the battery pack circuit breaker module.

2. The lightning protection battery pack according to claim 1, characterized in that: It also includes a battery shell, the external interface is arranged on the battery shell, and the battery pack, the battery pack disconnecting module, the battery management system and the lightning protection module are all fixed in the cavity formed by the battery shell.

3. The lightning protection battery pack according to claim 2, characterized in that: The battery casing is also externally connected to the ground terminal, and the lightning protection module is grounded by being connected to the battery casing.

4. The lightning protection battery pack according to claim 2, characterized in that: The battery management system and the lightning protection module are respectively fixed to the first surface of the battery pack disconnecting module, and the second surface of the battery pack disconnecting module is fixed to the inner wall of the battery housing.

5. The lightning protection battery pack according to claim 1, characterized in that: The battery pack includes a power supply assembly and a plurality of battery cells.

6. The lightning protection battery pack according to claim 5, characterized in that: The battery management system is also connected to the power supply assembly.

7. The lightning protection battery pack according to any one of claims 1 to 6, characterized in that: The lightning protection module includes a pulse suppression circuit.

8. The lightning protection battery pack according to claim 7, characterized in that: The external interface includes an external positive electrode and an external negative electrode; the battery pack disconnect module includes a positive access terminal and a negative access terminal; The pulse suppression circuit includes a gas discharge tube, a first thermistor, a second thermistor, a clamping circuit, a first voltage sensor and a second voltage sensor; the gas discharge tube is connected between the external positive electrode and the external negative electrode, and the gas discharge tube is also connected to the ground terminal; the first thermistor and the first voltage sensor are connected between the external positive electrode and the positive access terminal in sequence, and the signal output terminal of the first voltage sensor is connected to the battery management system; the second thermistor and the second voltage sensor are connected between the external negative electrode and the negative access terminal in sequence, and the signal output terminal of the second voltage sensor is connected to the battery management system; the first connection point between the first thermistor and the first voltage sensor is connected to one end of the clamping circuit, and the second connection point between the second thermistor and the second voltage sensor is connected to the other end of the clamping circuit, wherein the clamping voltage provided by the clamping circuit is not higher than the preset safety voltage of the battery pack.

9. The lightning protection battery pack according to claim 8, characterized in that: The clamping circuit includes a first transient suppression diode, the first transient suppression diode is connected between the first connection point and the second connection point, the first transient suppression diode provides a first clamping voltage, and the first clamping voltage is not higher than the preset safety voltage of the battery pack; The clamping circuit also includes a second transient suppression diode and a third transient suppression diode, the second transient suppression diode and the third transient suppression diode are reversely connected in series between the first connection point and the second connection point, and the reverse series combination of the second transient suppression diode and the third transient suppression diode provides a second clamping voltage, and the second clamping voltage is higher than the clamping voltage of the first transient suppression diode and is not higher than the preset safety voltage of the battery pack.

10. An automobile, characterized in that: include: An electrical appliance, a charging circuit and a lightning protection battery pack as described in any one of claims 1 to 9.

Images