Lightning protection battery pack, and vehicle

Abstract

A lightning protection battery pack, and a vehicle. The lightning protection battery pack (100) comprises an external interface (101), a battery set (102), a battery pack disconnecting module (103), a battery management system (104) and a lightning protection module (105). The external interface (101) is externally connected to an electric appliance (301) and a charging circuit (302); the lightning protection module (105) and the battery pack disconnecting module (103) are sequentially arranged on a charging and discharging loop between the external interface (101) and the battery set (102); the lightning protection module (105) is further connected to a grounding end; and the battery management system (104) is connected to both the lightning protection module (105) and the battery pack disconnecting module (103). A processed electrical signal is transmitted to a post-stage battery set (102), and a generated lightning strike signal is fed back to the battery management system (104). The battery management system (104) controls the switching on-off of the battery pack connecting module (103) on the basis of the lightning strike signal, such that the battery set (102) is disconnected from an external interface (101) under a lightning strike condition, thereby preventing the damage of an abnormal electrical signal to the battery set, and improving the lightning protection reliability of the battery pack (100).

Description

Lightning protection battery pack and car

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on April 29, 2024, with application number 202420931967.0. The entire contents of the above application are incorporated by reference into this application.

[0002] Technical Field

[0003] The present application relates to energy storage technology, and in particular to a lightning protection battery pack and a vehicle.

[0004] Background Art

[0005] With the development of energy storage technology, the performance of energy storage equipment has continued to improve, and energy storage equipment has been applied to various industries. As the application scenarios expand, the possibility of energy storage equipment being struck by lightning has also greatly increased.

[0006] Technical issues

[0007] In order to prevent the battery pack from being damaged by lightning, the related art connects the 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 this lightning protection method is not high.

[0008] Technical Solutions

[0009] In a first aspect, an embodiment of the present application provides a lightning protection battery pack, which includes: an external interface, a battery pack, a battery pack disconnect module, a battery management system, and a lightning protection module;

[0010] 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.

[0011] In a second aspect, an embodiment of the present application provides a car, comprising: electrical appliances, a charging circuit, and any lightning protection battery pack described in the first aspect.

[0012] Beneficial effects

[0013] The technical solution of the embodiment of the present application 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. Unlike the traditional lightning protection module which is only set at the interface of the protected electrical equipment, the lightning protection module is not only set 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 incoming electrical signals. On the one hand, it transmits the processed electrical signals to the subsequent battery pack, and on the other hand, it feeds back the generated lightning strike signal 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 event of a lightning strike, prevents the abnormal electrical signal from damaging the battery pack, and improves the lightning protection reliability of the battery pack.

[0014] BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic diagram of the composition of a lightning protection battery pack provided in an embodiment of the present application;

[0016] FIG2 is a schematic diagram of a partial structure of another lightning protection battery pack provided in an embodiment of the present application;

[0017] FIG3 is a schematic diagram of the composition of another lightning protection battery pack provided in an embodiment of the present application;

[0018] FIG4 is a schematic diagram of the composition of a car provided in an embodiment of the present application;

[0019] FIG5 is a schematic diagram of the composition of another automobile provided in an embodiment of the present application.

[0020] Modes for Carrying Out the Invention

[0021] This application proposes a lightning protection battery pack. Figure 1 is a schematic diagram of the components of a lightning protection battery pack provided in an embodiment of this application. Referring to Figure 1, the lightning protection battery pack 100 includes an external interface 101, a battery pack 102, a battery pack disconnect module 103, a battery management system 104, and a lightning protection module 105. The external interface 101 is connected to external electrical appliances and charging circuits; the lightning protection module 105 and the battery pack disconnect module 103 are sequentially arranged in 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; and the battery management system 104 is connected to the lightning protection module 105 and the battery pack disconnect module 103, respectively.

[0022] The external interface 101 refers to an interface component on the battery pack that is connected to an external electrical appliance and / or charging circuit, and can realize electrical and communication connections between the electrical appliance and / or 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.

[0023] The battery pack disconnect module 103 (also known as the Battery Disconnect Unit (BDU)) is a collection of disconnect devices for multiple power and charging circuits within the battery pack. Controllable switching devices within the disconnect module 103 control the on / off switching of the external power supply circuit, charging circuit, and internal power supply circuit of the battery pack 102. One side of the disconnect module 103 is connected to the output terminal of the battery pack 102, and the other side is connected to the external interface 101 via the lightning protection module 105. The control terminal of the disconnect module 103 is also in communication with the battery management system 104. The controllable switching devices within the disconnect module 103 control the on / off switching of the circuits in question based on communication signals from the battery management system 104.

[0024] The lightning protection module 105 is a lightning identification, analysis and conversion component in the battery pack. The lightning protection module 105 in this 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 event that 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 a pulse suppression circuit to capture and analyze the abnormal electrical signals received through the external interface 101, and convert the abnormal electrical signals into electrical signals with lower energy, thereby reducing the damage of the abnormal electrical signals 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 based on 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 achieving 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 related technology, it will not be described here in detail.

[0025] 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. Unlike the traditional lightning protection module which is only set at the interface of the protected electrical equipment, the lightning protection module is not only set 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 incoming electrical signals. On the one hand, it transmits the processed electrical signals to the subsequent battery pack, and on the other hand, it feeds back the generated lightning strike signal 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 event of a lightning strike, prevents the abnormal electrical signal from damaging the battery pack, and improves the lightning protection reliability of the battery pack.

[0026] Figure 2 is a schematic diagram of the partial structure of another lightning protection battery pack provided in an embodiment of the present application. In order to facilitate observation of the situation inside the cavity of the battery shell, Figure 2 hides the upper cover of the battery shell. On the basis of the aforementioned embodiment, referring to Figure 2, the lightning protection battery pack 100 also includes a battery shell 201, and the external interface 101 is arranged on the battery shell 201. 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.

[0027] The battery housing 201 is the protective housing of the battery pack. The battery housing 201 can be a rigid, plastic housing. The battery pack 102, the battery pack circuit breaker module 103, the battery management system 104, and the wiring connecting them are all disposed within 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. This fixed arrangement improves the stability of the battery pack. Furthermore, 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. This reduces the amount of wiring harnesses, improves the integration of the battery pack, and reduces the external volume of the battery pack. The battery pack 102 includes multiple battery cells and power components connected in series. The battery cells can be arranged in sequence and fixed on the inner wall of the battery casing 201 together with the power component. The power component can include a battery cell status sensing component, a series quantity switching component and a voltage balancing component. The power component is connected to the battery management system 104 and can report the working status of the battery cell 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.

[0028] The external interface 101 can be provided on the battery housing 201 for internal and external communication, thereby connecting the battery pack to external charging, power circuits, and communication lines. For example, the battery housing 201 is also externally connected to a ground terminal, and the lightning protection module 105 is grounded by being connected to the battery housing 201. For example, on the one hand, a ground terminal can be provided on the battery housing 201, and the ground terminal is externally connected to the ground terminal and internally connected to the lightning protection module 105, thereby achieving 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, thereby achieving dual grounding of the lightning protection module 105 and the metal housing.

[0029] The lightning protection module 105 may include a pulse suppression circuit that can capture and analyze abnormal waveforms in the electrical signal input from the external interface 101 and convert them into a lower-energy form, thereby reducing lightning damage to the battery pack 102. The pulse suppression circuit can also generate a corresponding lightning signal after conversion to enable communication with the battery management system 104. Exemplarily, the pulse suppression circuit may include at least one of a Zener diode protection circuit and a transient voltage suppressor.

[0030] For example, the battery management system 104 determines the intensity 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, the battery management system 104 can control all switching devices in the battery pack circuit breaker module 103 to disconnect and stop all power supply. In the case of a medium lightning strike, 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, the battery management system 104 controls the normal operation of the battery pack circuit breaker module 103 and the battery pack 102. The lightning protection module 105 is connected to the battery management system 104 for communication. Unlike the lightning protection module 105 connected to the charge and discharge circuit of the battery pack 102, the lightning protection module 105 can feed back the processed abnormal electrical signal as a lightning strike signal to the battery management system 104, thereby controlling the on and off of the charge and discharge circuit connected to the battery pack circuit breaker module 103. On the basis of suppressing abnormal waveforms to prevent electric shock from affecting the battery pack 102, a protective measure of disconnecting the circuit is added, thereby improving the reliability of the lightning protection battery pack 100.

[0031] The lightning protection battery pack provided in this embodiment also includes a battery housing, on which an external interface is provided. The battery pack, battery pack circuit breaker module, battery management system, and lightning protection module are all fixed within the cavity formed by the battery housing. The battery housing is also externally connected to a ground terminal, and the lightning protection module is grounded by connecting to the battery housing. The battery management system and 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 housing. The arrangement of the battery housing protects the internal circuit, while the internal circuit is fixed within the battery housing, thereby improving the power supply reliability of the battery pack.

[0032] FIG3 is a schematic diagram of the composition of another lightning protection battery pack provided by an embodiment of the present application. Referring to FIG3 , on the basis of the aforementioned 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 shown exemplarily 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 The resistor D1 and the first voltage sensor E1 are connected in sequence 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 in sequence between the external negative electrode A- and the negative access terminal B-, and the signal output end of the second voltage sensor E2 is connected to the battery management system 104; a 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 a 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.

[0033] The first thermistor D1 and the second thermistor D2 control the circuit to be shut down when the voltage across them or the current flowing through them exceeds the upper safety limit of the battery pack. The circuit is then restored to normal operation after the voltage across them and the current flowing through them return to below the upper safety limit. When the thermistor circuit is shut down, the gas discharge tube C discharges the abnormal current to the ground terminal GND. The clamping circuit 106 clamps the voltage across its two terminals (between the first connection point and the second connection point) to a preset voltage level. For example, it may include multiple transient suppression diodes with different clamping voltage levels. The first voltage sensor E1 and the second voltage sensor E2 detect the voltage level of their respective circuits relative to the ground terminal and generate voltage signals that are uploaded to the battery management system 104.

[0034] For example, the clamping circuit 106 may include a first TVS diode T1 connected between a first connection point and a second connection point. The first TVS diode T1 provides a first clamping voltage that is no higher than a preset safety voltage of the battery pack 102. The clamping circuit 106 may also include a second TVS diode T2 and a third TVS diode T3 connected in reverse series between the first connection point and the second connection point. The reverse series combination of the second TVS diode T2 and the third TVS diode T3 provides a second clamping voltage that is higher than the first clamping voltage of the first TVS diode T1 but no higher than the preset safety voltage of the battery pack 102. The clamping circuit 106 includes two parallel clamping branches, which can provide two clamping barriers with different voltage levels. In the event of a failure of the first TVS diode T1, the reverse series combination of the second TVS diode T2 and the third TVS diode T3 can provide a higher voltage clamping voltage, 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, thereby improving the reliability of the lightning protection module.

[0035] The present application also proposes a car. Figure 4 is a schematic diagram of the composition of a car provided in an embodiment of the present application. On the basis of the aforementioned embodiment, referring to Figure 4, the car 300 includes electrical appliances 301, a charging circuit 302 and any aforementioned lightning protection battery pack 100, wherein the electrical appliances 301 may include the power motor, lighting indication equipment, audio and video equipment, on-board computer and any other on-board electrical appliances of the car 300; the charging circuit 302 is a circuit component for charging access to the battery pack, which can receive electrical energy connected by the charging gun to realize charging of the battery pack.

[0036] Figure 5 is a schematic diagram of the composition of another automobile provided in an embodiment of the present application. On the basis of the aforementioned embodiment, referring to Figure 5 , the electrical appliance 301 includes an on-board computer 401, and the battery management system in the lightning protection battery pack 100 is also communicatively connected to the on-board computer 401 (the figure only schematically shows the connection relationship, and does not distinguish between communication connection and electrical connection).

[0037] The on-board computer 401, also known as the Electronic Control Unit (ECU), serves as the vehicle's master controller. The battery management system in the lightning protection battery pack 100 is communicatively connected to the on-board computer and can upload lightning strike signals and corresponding control signals to it. This communication between the on-board computer and the battery management system enables lightning strike signal uploads and power outage warnings, allowing the on-board computer 401 to rationally manage the operating status of other onboard devices and improve the safety of the vehicle 300. For example, before a high lightning strike level and the battery pack stops supplying power, the on-board computer 401 can activate the position marker lights and gradually reduce the speed of the power motor, minimizing the impact of subsequent power outages on driving. Building on the aforementioned embodiment, the electrical appliance 301 can further include a human-machine interface 402, communicatively connected to the on-board computer 401. For example, the human-machine interface 402 can include at least one of a touch screen and an interactive speaker. This interface can alert the driver before a lightning strike and power outage, improving the safety of the vehicle 300 during lightning weather.

[0038] The present application proposes a lightning protection battery pack and a car. The lightning protection battery pack includes an external interface, a battery pack, a battery pack disconnect module, a battery management system and a lightning protection module. Unlike the traditional lightning protection module which is only set at the interface of the protected electrical equipment, the lightning protection module is not only set between the external interface and the battery pack disconnect module, but also connected to the battery management system. The lightning protection module can capture, suppress and convert abnormal waveforms in the incoming electrical signals. On the one hand, it transmits the processed electrical signals to the subsequent battery pack, and on the other hand, it feeds back the generated lightning strike signal to the battery management system. The battery management system controls the on and off of the battery pack disconnect module according to the lightning strike signal, realizes the disconnection between the battery pack and the external interface in the event of a lightning strike, prevents the abnormal electrical signal from damaging the battery pack, and improves the lightning protection reliability of the battery pack and the car in which it is located.

Claims

1. A lightning protection battery pack, comprising: 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 further includes a battery shell, the external interface is arranged on the battery shell, and 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.

3. The lightning protection battery pack according to claim 2, wherein: The battery housing is externally connected to the ground terminal, and the lightning protection module is grounded by being connected to the battery housing.

4. The lightning protection battery pack according to claim 2, wherein: 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, wherein: The battery pack includes a power supply assembly and a plurality of battery cells.

6. The lightning protection battery pack according to claim 5, wherein: 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, wherein: The lightning protection module includes a pulse suppression circuit.

8. The lightning protection battery pack according to claim 7, wherein: 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 in sequence between the external positive electrode and the positive access terminal, 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 in sequence between the external negative electrode and the negative access terminal, 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, wherein: 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, wherein 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, which is higher than the first clamping voltage of the first transient suppression diode and is not higher than the preset safety voltage of the battery pack.

10. A car, comprising: An electrical appliance, a charging circuit and a lightning protection battery pack as described in any one of claims 1 to 9.

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