Battery pack

Abstract

Provided in the present application is a battery pack. The battery pack comprises a case (1), and a battery cell assembly (2), an electrolyte leakage detection device (3) and a BMS (4), which are mounted in the case (1), wherein a liquid cooling channel is provided inside a bottom plate (11) of the case (1), a liquid cooling medium is provided inside the liquid cooling channel, and the liquid cooling channel is in heat transfer connection with the battery cell assembly (2); the electrolyte leakage detection device (3) is mounted on an inner wall plate of the case (1); and the BMS (4) is in communication connection with the electrolyte leakage detection device (3), and the BMS (4) can receive and process data information detected by the electrolyte leakage detection device (3) and determine whether to output an alarm signal outwards.

Description

Battery pack

[0001] The present application claims priority to the Chinese patent application No. 202422488527.5, filed on October 14, 2024, to the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety.

[0002] TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a battery pack.

[0004] BACKGROUND

[0005] With the popularization of power battery systems, the situation of liquid leakage or water ingress in the battery pack increases, which may cause the battery to catch fire in severe cases. The related technology discloses a power lithium battery leakage alarm and fire extinguishing integrated device, which can realize online detection of volatile gas concentration, smoke concentration and air temperature in the power lithium battery pack by setting a detection module and a fire extinguishing module, and can alarm for liquid leakage, smoke and high temperature, thereby timely reminding personnel to investigate the internal hidden danger of the power lithium battery pack, and can realize timely fire extinguishing through the fire extinguishing module, effectively improving the safety.

[0006] TECHNICAL PROBLEM

[0007] The power lithium battery leakage alarm and fire extinguishing integrated device in the related technology cannot timely discover the situation of liquid leakage of the liquid cooling plate or water ingress of the battery pack, thereby still having certain response delay and still not having high safety factor.

[0008] TECHNICAL SOLUTION

[0009] Embodiments of the present application provide a battery pack, comprising a box body, a cell assembly, a liquid leakage detection device and a BMS, wherein:

[0010] The bottom plate of the box body has a liquid cooling channel inside, the liquid cooling channel is provided with a liquid cooling medium, and the liquid cooling channel is in heat transfer connection with the cell assembly;

[0011] The liquid leakage detection device is installed on the inner wall plate of the box body;

[0012] The BMS is in communication connection with the liquid leakage detection device, and the BMS can judge whether to output an alarm signal outward through the data information detected by the liquid leakage detection device.

[0013] ADVANTAGEOUS EFFECTS

[0014] The application provides a battery pack, which can detect whether liquid leakage exists in a box through a liquid leakage detection device, so that when a bottom plate of the box leaks liquid cooling medium or the box is filled with water, the BMS can receive liquid leakage information sent by the liquid leakage detection device and output an alarm signal outward, so that liquid leakage treatment can be performed in time. Through the arrangement of the liquid leakage detection device, liquid leakage in the box can be found and solved before the battery pack catches fire, so that the battery pack catching fire is effectively prevented and the safety of the battery pack is improved.

[0015] BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a structural schematic diagram of a battery pack provided by an embodiment of the application;

[0017] Fig. 2 is a three-dimensional diagram of an internal structure of the battery pack provided by an embodiment of the application at a first viewing angle;

[0018] Fig. 3 is a three-dimensional diagram of an internal structure of the battery pack provided by an embodiment of the application at a second viewing angle;

[0019] Fig. 4 is a top view of an internal structure of the battery pack provided by an embodiment of the application;

[0020] Fig. 5 is a partial structural exploded diagram of a cell assembly provided by an embodiment of the application;

[0021] Fig. 6 is an exploded diagram of a CCS assembly provided by an embodiment of the application;

[0022] Fig. 7 is a top view of the CCS assembly provided by an embodiment of the application;

[0023] Fig. 8 is a partial structural schematic diagram of a buffer gasket provided by an embodiment of the application;

[0024] Fig. 9 is a structural exploded diagram of a fire detection device provided by an embodiment of the application.

[0025] In the drawings:

[0026] 1, box; 11, bottom plate; 12, box cover; 13, external plug; 14, support; 15, insulating baffle;

[0027] 2, cell assembly; 21, single cell; 211, top cover plate; 2111, pressure relief valve; 22, heat insulation sheet; 23, CCS assembly; 231, CCS support; 2311, air hole; 232, buffer gasket; 2321, exhaust port; 2322, cover sheet; 23221, fixed part; 23222, movable part; 233, support gasket; 2331, via hole; 234, busbar; 2341, connected aluminum bar; 2342, output stage aluminum bar; 235, temperature acquisition probe; 236, voltage acquisition probe; 237, acquisition wire harness;

[0028] 3, leakage detection device;

[0029] 4, BMS;

[0030] 5, fire detection device; 51, shell; 52, temperature sensing probe; 53, gas sensitive probe;

[0031] 6, fire extinguishing device.

[0032] Embodiments of the present application

[0033] In combination with FIGS. 1-8, the present embodiment provides a battery pack, which includes a box body 1, and a cell assembly 2, a leakage detection device 3 and a battery management system (BMS) 4 installed in the box body 1.

[0034] The box body 1 includes a bottom plate 11 and a box cover 12. In the present embodiment, the inside of the bottom plate 11 has a liquid cooling channel, and a liquid cooling medium is arranged to flow in the liquid cooling channel. The liquid cooling channel is in heat transfer connection with the cell assembly 2, so that the bottom plate 11 is integrated with the liquid cooling plate in the conventional battery pack, thereby saving the space for additionally arranging the liquid cooling plate and making the battery pack structure of the present embodiment more compact. The box cover 12 has a square shell structure and has a containing space capable of containing the cell assembly 2. After the cell assembly 2, the leakage detection device 3, the alarm and the BMS 4 are installed in place on the bottom plate 11, the box cover 12 is closed to seal and protect the internal structure of the battery pack 2.

[0035] In the present embodiment, the battery pack includes two groups of cell assemblies 2 connected in series to meet the actual energy density requirement. Of course, in other embodiments, one or more than two cell assemblies 2 can also be arranged in the battery pack in combination with the battery pack containing space and the actual working condition requirement, and thus the number of the cell assemblies 2 arranged in the present application is not limited.

[0036] In the present embodiment, the two cell assemblies 2 have the same structure, and thus one of the cell assemblies 2 will be taken as an example to describe the cell assembly 2 below, and the structure of the other cell assembly 2 will not be described again.

[0037] Along a preset direction (i.e. along the direction shown by the X axis in FIG. 5, which is equivalent to the length direction of the box body 1), the cell assembly 2 includes a plurality of single cells 21 arranged regularly, and a heat insulation sheet 22, such as an aerogel layer, is arranged between adjacent single cells 21. The aerogel layer has the functions of heat insulation and flame retardation, and can effectively block the heat generated by the thermal runaway single cell 21 from spreading to the adjacent single cell 21. In addition, the aerogel layer is relatively light and has little effect on the weight of the cell assembly 2, and can also absorb the expansion force of the single cell 21, thereby effectively reducing the influence of the single cell 21 on the adjacent single cell 21.

[0038] In the direction shown by the X axis, the thickness of the thermal insulation sheet 22 is greater than or equal to 0.6 mm and less than or equal to 1.2 mm, and for example, the thickness of the thermal insulation sheet 22 can be 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, or 1.2 mm, etc. In this embodiment, the thickness of the thermal insulation sheet 22 is 0.7 mm, and the cross-sectional size is the same as that of the heat dissipation main surface of the single cell 21, so as to meet the requirement of preventing heat transfer to the adjacent single cell 21 under certain working conditions.

[0039] Referring to FIGS. 5, 6 and 8, the cell assembly 2 provided by the embodiment further includes a Cells Contact System (CCS) assembly 23, which includes a CCS support 231 and a buffer gasket 232. The CCS support 231 is arranged on the side of the single cell 21 having the top cover plate 211, and a ventilation hole 2311 is formed through the CCS support 231, which is oppositely arranged and communicated with the pressure relief valve 2111 on the top cover plate 211. The buffer gasket 232 is arranged on the CCS support 231, and an exhaust port 2321 communicated with the ventilation hole 2311 is formed on the buffer gasket 232, and a cover sheet 2322 is arranged on the exhaust port 2321. In use, when the actual pressure borne by the cover sheet 2322 is greater than the preset pressure, the cover sheet 2322 can open the closed exhaust port 2321, so that the gas discharged from the pressure relief valve 2111 can be discharged outward through the exhaust port 2321.

[0040] In one of the embodiments of the present embodiment, referring to FIG. 8, the cover sheet 2322 includes a fixed part 23221 and a movable part 23222 connected together, wherein the fixed part 23221 is fixedly connected to the buffer gasket 232, and the movable part 23222 is arranged on the exhaust port 2321 and movably connected to the buffer gasket 232. Through the above arrangement, when the actual pressure borne by the movable part 23222 is greater than the preset pressure, the movable part 23222 can be folded upward to open the exhaust port 2321, so that the exhaust port 2321 is open, thereby allowing the gas discharged from the pressure relief valve 2111 to be discharged outward, thereby reducing the internal pressure of the single cell 21 and avoiding the explosion of the single cell 21. Moreover, through the arrangement of the cover sheet 2322, the risk of high-temperature electrolyte being sprayed onto the adjacent single cell 21 to damage the adjacent normal single cell 21 can be effectively prevented.

[0041] In the present embodiment, the buffer gasket 232 is foam, and the CCS support 231 is made of PC (polycarbonate) plate, and the foam is adhered to the PC plate by using adhesive.

[0042] In this embodiment, the cross-sectional shape of the movable part 23222, the exhaust port 2321 and the air hole 2311 are all the same as the cross-sectional shape of the pressure relief valve 2111, that is, the cross-sectional shape of the movable part 23222, the exhaust port 2321 and the air hole 2311 are all arc-shaped to match the shape of the pressure relief valve 2111, thereby facilitating the exhaust.

[0043] Referring to FIG. 5, the CCS assembly 23 provided in this embodiment further includes a support pad 233 clamped and fixed between the single cell 21 and the CCS support 231, so that the CCS support 231 and the single cell 21 are fixedly connected through the support pad 233, which can not only meet the arrangement requirements of the spatial position of the CCS support 231, but also enable the CCS support 231 to avoid the pole assembly protruding outward from the single cell 21, thereby ensuring that the CCS support 231 can be flatly arranged on the single cell 21 and avoiding deformation of the CCS support 231. The support pad 233 is also made of foam material, which has good shock absorption and shock reduction effects, so as to reduce the possibility of hard contact between the CCS support 231 and the single cell 21.

[0044] In this embodiment, a via hole 2331 is formed in the support pad 233, and the via hole 2331 is communicated with the pressure relief valve 2111 and the air hole 2311 to facilitate the exhaust of gas.

[0045] The CCS assembly 23 provided in this embodiment further includes a busbar 234 and a temperature acquisition probe 235. The busbar 234 is arranged on the CCS support 231 and can be arranged in contact with the single cell 21 through the through hole of the CCS support 231. The busbar 234 can electrically connect a plurality of single cells 21, and the temperature acquisition probe 235 is connected to the BMS 4 and the busbar 234. Through the connection of the temperature acquisition probe 235 to the BMS 4, the BMS 4 can monitor the temperature state of the cell assembly 2 in real time. If an abnormal condition (such as overheating) is found, protective measures can be taken to prevent safety accidents and ensure the safe use of the battery pack.

[0046] Referring to FIG. 7, the busbar 234 includes a connecting aluminum bar 2341 and two output stage aluminum bars 2342. The connecting aluminum bar 2341 and the output stage aluminum bar 2342 are fixedly connected to the CCS support 231. The connecting aluminum bar 2341 is provided in a plurality of forms, and adjacent single cells 21 are connected in series through the connecting aluminum bar 2341. Along the X-axis direction, the two output stage aluminum bars 2342 are arranged at the two ends of the CCS assembly 23. One of the output stage aluminum bars 2342 is arranged to be electrically connected to one pole of an external power-using device, for example, a positive pole. The other output stage aluminum bar 2342 is arranged to be electrically connected to the other pole of the external power-using device (at this time, the other pole is a negative pole), so that the cell assembly 2 can supply power to the external power-using device.

[0047] It should be noted that, since two battery cell assemblies 2 are provided in the embodiment, one of the output stage aluminum bars 2342 in one of the battery cell assemblies 2 is electrically connected to one pole of the external electrical device, the other output stage aluminum bar 2342 in the one battery cell assembly 2 is connected to one of the output stage aluminum bars 2342 in the other battery cell assembly 2, and the other output stage aluminum bar 2342 in the other battery cell assembly 2 is electrically connected to the other pole of the external electrical device, so that the two battery cell assemblies 2 can serve as a positive pole wire-out module and a negative pole wire-out module to supply power to the external electrical device. Of course, it can be understood that in other embodiments, more battery cell assemblies 2 can be connected in series in the box 1 in the above manner to obtain a battery pack with greater energy density and energy storage capacity, and the present application is not limited thereto.

[0048] In actual situations, the output stage aluminum bars 2342 carry the input / output current of the battery cell assemblies 2, so when the battery cell assemblies 2 are charging and discharging, the current through the output stage aluminum bars 2342 is large, which can cause the temperature of the output stage aluminum bars 2342 to be relatively high. In addition, the single battery cells 21 located at the middle position of the battery cell assemblies 2 have insufficient heat dissipation capacity compared to the single battery cells 21 at other positions due to their position arrangement. Therefore, in the embodiment, the two output stage aluminum bars 2342 and the two connecting aluminum bars 2341 located at the middle position of the CCS assembly 23 are each provided with the temperature acquisition probe 235 described above to detect the actual temperature at four positions with high temperature on one battery cell assembly 2. By detecting the actual temperature at these four positions, it can not only accurately determine whether the battery cell assembly 2 is safe, but also effectively control the number of temperature acquisition probes 235 used, thereby saving costs.

[0049] Of course, in other embodiments, the temperature acquisition probe 235 described above can also be provided on each connecting aluminum bar 2341 to detect the actual temperature of each single battery cell 21, so that the working state of the battery cell assembly 2 can be comprehensively monitored and controlled. It should be noted that the number of temperature acquisition probes 235 is affected by factors such as the selection of the board type and the size of the box 1, so the person skilled in the art can select the number of temperature acquisition probes 235 according to the actual situation.

[0050] In some embodiments, as shown in FIG. 1, two external connectors 13 are arranged on the side wall of the box 1 on the left in FIG. 2. One of the output level aluminum bars 2342 in the upper electric core assembly 2 is connected to one of the external connectors 13, and the other output level aluminum bar 2342 in the lower electric core assembly 2 is connected to the other external connector 13, so that the external electrical equipment can be electrically connected to the two electric core assemblies 2 through the two external connectors 13. In addition, the external connector 13 can also rotate around the center by 360°, which has a wider range of application, so that the power harness can meet the installation angle of 360°, has higher flexibility, and is easier to connect and arrange the power harness, thereby reducing the assembly time.

[0051] Referring to FIG. 7, the output level aluminum bar 2342 and the connecting aluminum bar 2341 are also provided with a voltage collection probe 236. The temperature collection probe 235 and the voltage collection probe 236 are connected to the BMS 4 through a collection harness 237, so as to monitor the working voltage, temperature and current of the single electric core 21 in real time through the BMS 4, detect the health status of the single electric core 21, and control the working state of the single electric core 21 in real time through the BMS 4, so as to protect the battery. Referring to FIG. 3, the box 1 is fixedly provided with a bracket 14, and the BMS 4 is installed on the bracket 14. In the embodiment, the temperature collection probe 235 and the voltage collection probe 236 are fixed by dispensing, which can realize multi-point measurement and has high measurement accuracy.

[0052] Referring to FIG. 2, the liquid leakage detection device 3 has a liquid detection probe installed on the inner wall plate of the box 1. Since the battery pack may have liquid leakage in the liquid cooling channel or water entering the box 1 during use, the liquid leakage in the box 1 can be detected by the liquid detection probe in the embodiment, the BMS 4 receives and processes the data information detected by the liquid detection probe, and judges whether to output an alarm signal to the outside, so that the working personnel can receive the liquid leakage information in time and process it, thereby avoiding the safety risks such as short circuit, fire and the like in the battery pack due to liquid leakage. Through the above arrangement, the liquid leakage phenomenon in the box 1 can be found and solved before the battery pack catches fire, thereby greatly improving the use safety of the battery pack.

[0053] In one of the embodiments of the present application, an alarm (not shown in the figure) in communication connection with the BMS 4 is also fixedly arranged in the box 1, so that when the BMS 4 detects that there is liquid leakage in the box 1, the alarm can be immediately controlled to be turned on to send an alarm signal to the outside in the form of sound, light or sound and light combination. Of course, in other embodiments, the BMS 4 can also transmit the liquid leakage alarm information to the working personnel in the form of outputting a warning such as short message, email, etc., which is not limited in the present application.

[0054] In some embodiments, the liquid detection probe is a metal probe. When there is a liquid leakage in the box 1, the liquid detection probe will quickly respond once the liquid leakage contacts the probe. The conductivity, resistance, voltage or current value of the liquid detection probe will change significantly, and then the detection circuit will immediately send the change value to the BMS 4 for processing. In this way, the response speed of the liquid leakage detection device 3 can be effectively improved, and the staff can be reminded to clean the liquid leakage in the battery pack in time, ensuring the safety of the battery pack.

[0055] In some embodiments, the liquid leakage detection device 3 can be fixedly arranged on the bottom plate 11 through a threaded connector or the like. Compared with being fixed on the peripheral wall of the box cover 12, the operation of fixing the liquid leakage detection device 3 on the box cover 12 using a fixing frame can be omitted, the installation method is simpler, and the cost is saved. In addition, the liquid detection probe is spaced apart from the bottom plate 11 by a predetermined distance. When the battery pack actually leaks and the amount of liquid leakage forms a certain height in the box 1, the liquid detection probe can touch the liquid leakage and send the liquid leakage information to the BMS 4, thereby avoiding the possibility of false reporting. In the example, the predetermined distance between the liquid detection probe and the bottom plate 11 is 1 mm.

[0056] In the example, the bottom plate 11 is made of metal. In order to reduce the interference of the bottom plate 11 on the liquid detection probe which is also made of metal, an insulating baffle 15 is arranged on the bottom plate 11 opposite to the liquid detection probe. The insulating baffle 15 is arranged between the bottom plate 11 and the liquid detection probe to reduce the electrostatic interference of the bottom plate 11 on the liquid detection probe, thereby improving the response accuracy of the liquid detection probe.

[0057] It should be noted that the insulating baffle 15 is made of PC material, and the production material of the insulating baffle 15 is the same as that of the base insulating film, so as to effectively control the production cost of the battery pack, simplify the production process and improve the production efficiency.

[0058] In some embodiments, the battery pack provided by the present embodiment further comprises a fire detection device 5 arranged in the box 1, the fire detection device 5 comprises a shell 51, a temperature sensing probe 52 and a gas sensitive probe 53, the shell 51 meets the UL94-V0 flame retardant standard, for example, materials such as copper-zinc alloy, aluminum-silicon alloy, etc. can be used, and a flame retardant material can also be added to the surface of the shell, which is not limited by the present application; the temperature sensing probe 52 and the gas sensitive probe 53 are both fixedly arranged in the shell and are both connected to the BMS 4 through an adapter wire harness and can be connected to the BMS 4 in Controller Area Network (CAN) communication, the temperature sensing probe 52 can detect the air temperature in the box 1, the gas sensitive probe 53 can detect the gas concentration in the box 1, and the BMS 4 can determine whether to start the alarm through the air temperature detected by the temperature sensing probe 52 and the gas concentration detected by the gas sensitive probe 53.

[0059] In the present embodiment, the shell 51 in the fire detection device 5 is fixed on the support 14. By arranging the fire detection device 5 on the support 14, on the one hand, the installation compactness of the fire detection device 5 and other components such as the BMS 4 is improved, and on the other hand, the connection distance between the temperature sensing probe 52 and the gas sensitive probe 53 in the fire detection device 5 and the BMS 4 can be shortened, thereby facilitating the arrangement of the adapter wire harness.

[0060] In actual use, some gases such as carbon monoxide gas may be generated in the activation process of the single cell 21 during charging, resulting in an increase in the internal pressure of the single cell 21, which will cause the shell to rupture and cause electrolyte leakage when the pressure reaches a certain level. Since the electrolyte of the single cell 21 has strong volatility and is flammable, it will react to generate heat when it comes into contact with water, thereby causing the single cell 21 to easily catch fire when charging. Based on the above situation, for example, when the air temperature in the box 1 is detected by the temperature sensing probe 52 to be 70°C and the carbon monoxide concentration is detected by the gas sensitive probe 53 to be 190ppm, the temperature sensing probe 52 and the gas sensitive probe 53 can immediately send an alarm signal to the BMS 4, so that the BMS 4 can immediately control the alarm to issue an alarm information, reminding the staff to make emergency treatment in time.

[0061] It should be noted that the alarm level is different at different temperatures, which can be divided into two levels, three levels and four levels, and the temperature corresponding to different alarm levels can be adjusted according to actual conditions, and the alarm information can include sound or light, for example, when using sound as the alarm information medium, it should be greater than 90DB.

[0062] The battery pack provided by the embodiment further comprises a fire extinguishing device 6. In one of the embodiments of the embodiment, the fire extinguishing device 6 adopts aerosol. The aerosol is non-toxic and non-corrosive, can be stored at room temperature, has small volume and is easy to install. In the embodiment, the fire extinguishing device 6 is integrated on the shell of the fire detection device 5. The aerosol is provided with fire extinguishing medium. Once a fire occurs on the battery cell assembly 2, the aerosol will melt and release the internal fire extinguishing medium to extinguish the fire, so as to quickly extinguish the fire at the initial stage of the fire and reduce the possibility of fire development.

[0063] The fire extinguishing medium comprises aerosol generating agent and chemical coolant. The aerosol generating agent can quickly extinguish the fire, and the chemical coolant can reduce the temperature and prevent the phenomenon of rekindling, thereby improving the fire extinguishing efficiency and reliability.

[0064] It should be noted that, in the embodiment, when the fire occurs on the battery cell assembly 2, the BMS 4 can also receive the air temperature detected by the temperature sensing probe 52 and the gas concentration detected by the gas sensitive probe 53, so that the fire extinguishing device 6 can extinguish the fire of the box 1 while the BMS 4 can control the alarm to send alarm information, thereby achieving the dual protection of the alarm and fire extinguishing functions. By simultaneously arranging the fire detection device 5, the fire extinguishing device 6 and the liquid leakage detection device 3 in the box 1, the battery pack can not only detect the temperature and gas concentration when the electrolyte leaks, but also can participate in fire extinguishing while sending warning signals to the staff, and can also detect whether there is liquid leakage of the bottom plate 11 or water in the box 1 in real time, thereby protecting the safety of the battery cell assembly 2 in many aspects and greatly improving the safety and reliability of the battery pack in use.

Claims

1. A battery pack, comprising a box (1), a battery cell assembly (2), a leakage detection device (3) and a battery management system (BMS) (4), wherein: The bottom plate (11) of the box (1) has a liquid cooling channel inside, a liquid cooling medium is provided in the liquid cooling channel, and the liquid cooling channel is connected to the battery core assembly (2) in a heat transfer manner; The liquid leakage detection device (3) is installed on the inner wall plate of the box body (1); The BMS (4) is communicatively connected to the liquid leakage detection device (3), and the BMS (4) can determine whether to output an alarm signal based on the data information detected by the liquid leakage detection device (3).

2. The battery pack according to claim 1, further comprising an insulating baffle (15), wherein the insulating baffle (15) is laid on the bottom plate (11) at least at a position opposite to the leakage detection device (3).

3. The battery pack according to claim 1, wherein: The liquid leakage detection device (3) is spaced apart from the bottom plate (11) by a preset distance.

4. The battery pack according to claim 1, wherein: Along a preset direction, the battery cell assembly (2) comprises a plurality of single battery cells (21) arranged in a regular arrangement, and a heat insulating sheet (22) is sandwiched between adjacent single battery cells (21).

5. The battery pack according to claim 4, wherein: Along the preset direction, the thickness of the heat insulation sheet (22) is greater than or equal to 0.6 mm and less than or equal to 1.2 mm.

6. The battery pack according to claim 4, wherein: The battery cell assembly (2) further includes an integrated busbar CCS assembly (23), wherein the CCS assembly (23) includes a CCS bracket (231) and a buffer gasket (232), wherein: The CCS bracket (231) is provided on a side of the single cell (21) having a top cover plate (211), and a vent hole (2311) is provided on the CCS bracket (231), and the vent hole (2311) is connected to a pressure relief valve (2111) on the top cover plate (211); The buffer gasket (232) is laid on the CCS bracket (231), and an exhaust port (2321) is provided on the buffer gasket (232). The exhaust port (2321) is connected to the air vent (2311), and a cover sheet (2322) is provided at the exhaust port (2321). When the actual pressure borne by the cover sheet (2322) is greater than a preset pressure, the cover sheet (2322) can open the exhaust port (2321) so that the gas discharged from the pressure relief valve (2111) can be discharged outward through the exhaust port (2321).

7. The battery pack according to claim 6, wherein: The covering sheet (2322) comprises a fixed portion (23221) and a movable portion (23222) connected to each other, wherein the fixed portion (23221) is fixedly connected to the buffer gasket (232), and the movable portion (23222) covers the exhaust port (2321) and is movably connected to the buffer gasket (232). When the actual pressure borne by the movable portion (23222) is greater than a preset pressure, the movable portion (23222) can open the exhaust port (2321) so that the gas discharged from the pressure relief valve (2111) can be discharged outward through the exhaust port (2321).

8. The battery pack according to claim 6, wherein: The CCS assembly (23) further comprises a support gasket (233), the support gasket (233) being sandwiched and fixed between the single battery cell (21) and the CCS bracket (231), the support gasket (233) being provided with a through hole (2331), the through hole (2331) being connected to the pressure relief valve (2111) and the air vent (2311).

9. The battery pack according to claim 6, wherein: The CCS assembly (23) further includes a busbar (234) and a temperature acquisition probe (235); the busbar (234) is arranged on the CCS bracket (231) and is arranged in contact with the single battery cell (21); the busbar (234) can electrically connect a plurality of the single battery cells (21); and the temperature acquisition probe (235) is connected to the BMS (4) and the busbar (234).

10. The battery pack according to claim 9, wherein: The busbar (234) comprises a connecting aluminum bar (2341) and two output-level aluminum bars (2342); the connecting aluminum bar (2341) and the output-level aluminum bar (2342) are both fixedly connected to the CCS bracket (231); the connecting aluminum bar (2341) is configured to connect a plurality of the single cells (21) in series; along the preset direction, the two output-level aluminum bars (2342) are disposed at both ends of the CCS assembly (23) and connected to the connecting aluminum bar (2341); the output-level aluminum bar (2342) is configured to connect the single cells (21) to external electrical equipment; The output-stage aluminum bar (2342) and the connecting aluminum bar (2341) are both fixedly provided with the temperature acquisition probe (235).

11. The battery pack according to any one of claims 1 to 10, further comprising a fire detection device (5), the fire detection device (5) comprising a housing (51), a temperature probe (52) and a gas probe (53), the housing (51) being fixedly mounted in the housing (1), the temperature probe (52) and the gas probe (53) being fixedly mounted in the housing, and both being communicatively connected to the BMS (4), the temperature probe (52) being capable of detecting the air temperature in the housing (1), the gas probe (53) being capable of detecting the gas concentration in the housing (1), and the BMS (4) being capable of determining whether to output an alarm signal based on the air temperature detected by the temperature probe (52) and the gas concentration detected by the gas probe (53).

12. The battery pack according to claim 11, further comprising a fire extinguishing device (6), wherein the fire extinguishing device (6) is fixedly arranged in the box (1).

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