A battery pack

Abstract

The present application discloses a battery pack, which includes: a battery case; at least two battery cell modules arranged in the battery case at least along a first direction, an explosion-proof valve being provided at the bottom of the battery cell module; and a mica plate disposed in the battery case and between the bottom of the battery cell module and the battery case, the mica plate being provided with a pressure relief valve corresponding to the position of the explosion-proof valve. When the battery cell module is out of thermal control, the high-temperature and high-pressure gas and ejecta ejected from the explosion-proof valve of the battery cell module are directly ejected through the pressure relief valve of the mica plate, which can shorten the flow path and range of the high-temperature and high-pressure gas and ejecta, shorten the gas release path of the battery cell module out of thermal control, reduce the adverse effects of the out-of-thermal-control battery cells on other battery cells, achieve thermoelectric separation, reduce the risk of high-voltage arcing, solve the problem of thermal diffusion caused by the out-of-thermal-control of the battery cell module to a certain extent, and improve the overall safety of the battery pack.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery pack. Background Art

[0002] In related technologies, power batteries typically use a cold plate at the bottom for heat exchange and a pressure relief valve at the top to release high-temperature, high-pressure gas in the event of thermal runaway. However, this top-pressure relief method can cause arcing in the high-voltage copper busbar, exacerbating thermal runaway and posing a safety hazard to the battery pack.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the Invention

[0004] The present application aims to at least partially address the technical problem of unreasonable pressure relief methods for power batteries, which may lead to potential safety hazards in battery packs.

[0005] An embodiment of the present application provides a battery pack, comprising:

[0006] Battery case;

[0007] At least two battery cell modules, the battery cell modules are arranged in the battery case at least along a first direction, and an explosion-proof valve is provided at the bottom of the battery cell module; and

[0008] A mica board is arranged in the battery shell and located between the bottom of the battery module and the battery shell. The mica board is provided with a pressure relief valve corresponding to the position of the explosion-proof valve.

[0009] In some embodiments, the mica board is attached to the bottom of the battery cell module.

[0010] In some embodiments, the battery pack further includes high-voltage components, which are disposed on the top or side of the battery cell module.

[0011] In some embodiments, the battery case includes a top plate, a bottom plate corresponding to the top plate, and a side plate connected between the top plate and the bottom plate, the bottom plate is spaced apart from the mica plate, and the bottom plate includes a protective portion corresponding to the position of the pressure relief valve and an exhaust hole staggered with the pressure relief valve.

[0012] In some embodiments, the bottom plate is a hot-formed steel plate, and the exhaust holes are in the shape of long strips.

[0013] In some embodiments, the side plate includes two end plates arranged along the first direction and two side plates adjacent to the end plates, and the end plates and / or the side plates are liquid-cooled integrated plates.

[0014] In some embodiments, the liquid-cooling integrated plate includes two stacked liquid-cooling plates and a thermal pad disposed between the two liquid-cooling plates, wherein the thermal pad is compressible.

[0015] In some embodiments, the liquid cooling plate is a metal plate, and a heat exchange channel is formed in the metal plate.

[0016] In some embodiments, a thermal conductive adhesive layer is provided on a side of the liquid cooling integrated board adjacent to the battery core module.

[0017] In some embodiments, the liquid cooling integrated board is provided between two adjacent battery core modules.

[0018] The embodiments of the present application have at least the following beneficial effects:

[0019] In the above-mentioned battery pack, the explosion-proof valve of the battery cell module is arranged at the bottom of the battery cell module. At the same time, the mica board is arranged at the bottom of the battery cell module and is provided with a pressure relief valve corresponding to the explosion-proof valve. When the battery cell module thermally runs away, the high-temperature and high-pressure gas and ejecta ejected from the explosion-proof valve of the battery cell module are directly ejected through the pressure relief valve of the mica board, which can shorten the flow path and range of the high-temperature and high-pressure gas and ejecta, shorten the gas release path of the thermal runaway of the battery cell module, avoid the high-temperature and high-pressure gas and ejecta from diffusing to other battery cell modules or contacting high-voltage components, isolate the high-temperature and high-pressure gas and ejecta from high-voltage components, reduce the adverse effects of the thermal runaway battery cell on other battery cells, realize thermoelectric separation, reduce the risk of high-voltage arcing, and to a certain extent solve the heat diffusion problem caused by thermal runaway of the battery cell module, thereby improving the overall safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 An exploded view of a battery pack in some embodiments of the present application is shown;

[0022] Figure 2 Shown Figure 1 Schematic diagram of the bottom structure of the CEC core module;

[0023] Figure 3A schematic diagram showing the structure of a liquid cooling integrated plate for a battery pack in some embodiments of the present application is shown;

[0024] Figure 4 Shown Figure 3 Schematic diagram of the structure of the heat exchange channel in the liquid cooling integrated plate.

[0025] Reference numerals:

[0026] 100, battery shell; 110, top plate; 120, bottom plate; 121, protective part; 122, exhaust hole; 130, side plate; 131, end plate; 132, side plate; 140, liquid-cooling integrated board; 141, liquid-cooling plate; 1411, heat exchange channel; 142, thermal pad; 143, thermal conductive adhesive layer; 200, battery cell module; 210, explosion-proof valve; 300, mica board; 310, pressure relief valve; F1, first direction. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] In addition, this application may repeat reference numbers and / or reference letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0029] The present application is described below with reference to specific embodiments and with reference to the accompanying drawings:

[0030] With the increasing popularity and demand for electric vehicles, batteries, as important energy storage devices, are also developing and improving. However, batteries are prone to problems such as thermal runaway under conditions such as high temperature, overcharge, over-discharge, and mechanical damage.

[0031] A battery pack generally has multiple battery modules. If a single battery module experiences thermal runaway, it is easy to cause heat diffusion, resulting in thermal runaway of multiple battery modules 200. It often happens that due to thermal runaway of a single battery module, the ejecta and high-temperature gases generated are often in the same space with high-voltage components, which can easily cause high-voltage arcing, causing the thermal runaway to continue to worsen, and ultimately leading to safety problems and damage to the entire battery pack, resulting in large economic losses.

[0032] To prevent heat spread from a single battery cell module, a pressure relief valve can be installed to promptly discharge high-temperature, high-pressure gases generated by thermal runaway from the battery pack. However, in related technologies, the pressure relief valve is typically located at the top, on the same side as the high-voltage components. This can cause arcing in the high-voltage copper busbar, exacerbating thermal runaway and posing a safety hazard to the entire battery pack.

[0033] Furthermore, while some solutions have pressure relief valves positioned at the bottom, these pressure relief paths are irrationally designed, resulting in a long pressure relief path and poor pressure relief effectiveness. For example, Chinese patent document CN216055028U discloses a battery case and battery device comprising a first case, a second case, and a pressure relief valve. The second case is connected below the first case, with a pressure relief structure positioned between the second and first cases. A filter structure is positioned within the cavity of the second case, and the second case includes a bottom plate positioned on the side of the filter structure facing away from the first case. The pressure relief valve is positioned on the bottom plate. The battery is positioned within the first case, and the battery's explosion-proof valve is positioned relative to the pressure relief structure between the second case and the second case. This means that the explosion-proof valve and the pressure relief valve are positioned at the top and bottom of the second case, respectively, and are relatively far apart. If a single battery experiences thermal runaway, the high-temperature gas within the battery will first flow into the second case, diffuse within the second case, and then be discharged through the pressure relief valve. This diffusion within the second case will inevitably affect other batteries. In addition, this type of battery box has the defects of low integration and low energy density.

[0034] In order to solve the technical problem that the battery pressure relief method is unreasonable and the battery pack has potential safety hazards, the embodiment of the present application proposes a battery pack, such as Figures 1 to 4 As shown, the battery pack includes a battery case 100, at least two battery cell modules 200, and a mica board 300. The battery cell modules 200 are arranged in the battery case 100 along at least a first direction F1, and an explosion-proof valve 210 is provided at the bottom of the battery cell modules 200. The mica board 300 is disposed within the battery case 100 and located between the bottom of the battery cell modules 200 and the battery case 100. The mica board 300 is provided with a pressure relief valve 310 corresponding to the position of the explosion-proof valve 210.

[0035] The battery pack proposed in the embodiment of the present application is as follows: Figures 1 to 4As shown, the explosion-proof valve 210 of the battery cell module 200 is provided at the bottom of the battery cell module 200. At the same time, the mica plate 300 is provided at the bottom of the battery cell module 200 and is provided with a pressure relief valve 310 corresponding to the explosion-proof valve 210. When the battery cell module 200 undergoes thermal runaway, the high-temperature and high-pressure gas and ejecta ejected from the explosion-proof valve 210 of the battery cell module 200 are directly ejected through the pressure relief valve 310 of the mica plate 300, which can shorten the flow path and range of the high-temperature and high-pressure gas and ejecta, shorten the gas release path of the thermal runaway of the battery cell module 200, prevent the high-temperature and high-pressure gas and ejecta from spreading to other battery cell modules 200 or contacting high-voltage components, isolate the high-temperature and high-pressure gas and ejecta from high-voltage components, etc., reduce the adverse effects of the thermally runaway battery cell on other battery cells, achieve thermal-electric separation, reduce the risk of high-voltage arcing, and to a certain extent solve the thermal diffusion problem caused by the thermal runaway of the battery cell module 200, improving the overall safety of the battery pack.

[0036] In some embodiments, as Figure 1 shown, the battery cell modules 200 in the battery pack are arranged in the battery case 100 along the first direction F1.

[0037] In some other embodiments, the battery cell modules 200 in the battery pack can be arranged in the battery case 100 along a second direction perpendicular to the first direction F1.

[0038] In some other embodiments, the battery cell modules 200 in the battery pack can also be arranged in an array along the first direction F1 and the second direction in the battery case 100.

[0039] As an alternative implementation, as Figure 1 shown, the mica plate 300 is attached to the bottom of the battery cell module 200.

[0040] In some embodiments, by attaching the mica plate 300 to the bottom of the battery cell module 200, the explosion-proof valve 210 provided at the bottom of the battery cell module 200 can be directly docked with the pressure relief valve 310 provided on the mica plate 300, which can further shorten the distance between the explosion-proof valve 210 and the pressure relief valve 310, so as to further shorten the flow path and range of the high-temperature and high-pressure gas and ejecta, shorten the gas release path of the thermal runaway of the battery cell module 200, improve the thermal-electric separation effect of the battery pack, further reduce the risk of high-voltage arcing, and further reduce the thermal diffusion problem caused by the thermal runaway of the battery cell module 200.

[0041] In some embodiments, by attaching the mica plate 300 to the bottom of the battery cell module 200, it is also possible to prevent high-temperature and high-pressure gases and ejecta from diffusing from the gap between the mica plate 300 and the bottom of the battery cell module 200 to other battery cell modules 200, and to a certain extent, it can prevent affecting other battery cell modules 200 or contacting high-voltage components. That is to say, by attaching the mica plate 300 to the bottom of the battery cell module 200, a heat insulation barrier in the lateral direction of the battery pack can be constructed, effectively blocking the spread of thermal runaway, so it can play a role in protecting against thermal runaway to a certain extent and reducing the risk of thermal runaway.

[0042] As an alternative embodiment, the battery pack further includes high-voltage components, and the high-voltage components are arranged on the top or side of the battery cell module 200.

[0043] In some embodiments, by arranging the high-voltage components on the top or side of the battery cell module 200, so that the high-voltage components and the explosion-proof valve 210 are on different sides of the battery cell module 200, at least the vertical electro-thermal separation of the battery membrane can be achieved, and the problem of heat diffusion caused by thermal runaway can be avoided to a certain extent, improving the safety of the battery pack.

[0044] In some embodiments, the high-voltage components include, but are not limited to, high-voltage components such as high-voltage copper bars, relays, and fuses.

[0045] As an alternative embodiment, as Figure 1 shown, the battery case 100 includes a top plate 110, a bottom plate 120 corresponding to the top plate 110, and side plates 130 connecting the top plate 110 and the bottom plate 120. The bottom plate 120 is spaced from the mica plate 300. The bottom plate 120 includes a protection portion 121 corresponding to the position of the pressure relief valve 310 and an exhaust hole 122 offset from the pressure relief valve 310.

[0046] In some embodiments, as Figure 1 shown, spacing the bottom plate 120 from the mica plate 300 can prevent the bottom plate 120 from blocking the pressure relief valve 310 on the mica plate 300 and avoid the failure of the pressure relief valve 310; making the protection portion 121 on the bottom plate 120 correspond to the position of the pressure relief valve 310, the pressure relief valve 310 can be protected by the protection portion 121 to prevent damage to the pressure relief valve 310 caused by hard objects, etc.; making the exhaust hole 122 on the bottom plate 120 offset from the pressure relief valve 310 can not only facilitate the setting of the protection portion 121, but also enable the exhaust hole 122 to communicate with the mica plate 300 through the gap between the bottom plate 120 and the mica plate 300, so that the high-temperature and high-pressure gases and ejecta discharged by the pressure relief valve 310 are discharged outside the battery case 100 through the exhaust hole 122 and into the atmosphere, enabling the high-temperature and high-pressure gases and ejecta to be quickly discharged. Not only is the gas release path shortened, but the gas release rate is also relatively high, thereby reducing the risk of thermal runaway of the battery pack to a greater extent and improving the safety of the battery pack.

[0047] As an optional implementation, Figure 1 As shown, the bottom plate 120 is a hot-formed steel plate, and the exhaust holes 122 are in the shape of long strips.

[0048] In some embodiments, as Figure 1 As shown, the bottom plate 120 can be made of a thermoformed steel plate, with elongated vent holes 122 provided on the thermoformed steel plate. The remaining portion of the thermoformed steel plate forms an elongated protective portion 121. The elongated protective portion 121 can be aligned with the pressure relief valve 310 on the mica plate 300, thereby protecting the pressure relief valve 310 on the mica plate 300 through the protective portion 121. Furthermore, the thermoformed steel plate has high strength and can provide support for the battery case 100. Furthermore, the thermoformed steel plate has good thermal conductivity and can help cool high-temperature, high-pressure gases and ejected materials to a certain extent.

[0049] As an optional implementation, Figures 1 to 4 As shown, the side plate 130 includes two end plates 131 arranged along the first direction F1 and two side plates 132 adjacent to the end plates 131 . The end plates 131 and / or the side plates 132 are liquid cooling integrated plates 140 .

[0050] In some embodiments, as Figure 1 As shown, the side plate 130 of the battery shell 100 includes two end plates 131 arranged along the first direction F1 and two side plates 132 adjacent to the end plates 131, and is connected between the top plate 110 and the bottom plate 120 through the two end plates 131 and the two side plates 132 to form a rectangular battery shell 100. Optionally, the end plates 131 and / or the side plates 132 are liquid-cooled integrated plates 140, that is, the two end plates 131 and one, two or three of the two end plates 131 are liquid-cooled integrated plates 140. Further optionally, the two end plates 131 and the two end plates 131 can all be liquid-cooled integrated plates 140, that is, the side plates 130 are all liquid-cooled integrated plates 140.

[0051] Compared with the solution in the related art that only uses bottom cooling in the battery pack, which has a small heat exchange area and low heat exchange efficiency, in the battery pack proposed in the embodiment of the present application, the liquid cooling integrated plate 140 can make the battery shell 100 have a larger heat exchange area, which can improve the heat exchange efficiency of the battery pack to a certain extent; at the same time, the liquid cooling integrated plate 140 has a high degree of integration and occupies a small volume, which can improve the space utilization of the battery pack, thereby improving the energy density of the battery pack, and thus improving the cruising range of the entire electric vehicle.

[0052] As an optional implementation, Figures 1 to 4As shown, the liquid cooling integrated plate 140 includes two stacked liquid cooling plates 141 and a thermal pad 142 disposed between the two liquid cooling plates 141 , wherein the thermal pad 142 is compressible.

[0053] In some embodiments, as Figures 1 to 4 As shown, the liquid-cooled integrated plate 140 includes a liquid-cooling plate 141, a heat-conducting plate and a liquid-cooling plate 141 stacked in sequence. On the one hand, the thermal pad 142 can enable heat exchange between the two liquid-cooling plates 141, thereby making the overall thermal conductivity and heat exchange efficiency of the liquid-cooled integrated plate 140 higher; on the other hand, due to the compressibility of the thermal pad 142, during the use of the battery pack, the thermal pad 142 can absorb the expansion and deformation of the battery cell module 200 caused by long-term use, so that the liquid-cooled integrated plate 140 has the functions of heat exchange and deformation absorption at the same time, thereby improving the integration effect of the liquid-cooled integrated plate 140.

[0054] As an optional implementation, Figures 1 to 4 As shown, the liquid cooling plate 141 is a metal plate, and a heat exchange channel 1411 is formed in the metal plate.

[0055] In some embodiments, as Figures 1 to 4 As shown, the liquid cooling plate 141 is a metal plate. The liquid cooling plate 141 uses a metal plate with high thermal conductivity and strength. On the one hand, it can improve the thermal conductivity efficiency of the liquid cooling integrated plate 140; on the other hand, it can also improve the overall strength of the liquid cooling integrated plate 140, and improve the structural strength and support effect of the liquid cooling integrated plate 140.

[0056] In some embodiments, as Figures 1 to 4 As shown, a heat exchange channel 1411 is formed in the metal plate. The heat exchange efficiency of the liquid cooling plate 141 can be further improved by circulating the medium in the heat exchange channel 1411, thereby improving the heat exchange efficiency of the liquid cooling integrated plate 140.

[0057] In some embodiments, the heat exchange channel 1411 can not only circulate cooling medium, but also flow heating medium, so that the liquid cooling integrated board 140 can heat and cool the battery cell module 200, thereby improving the thermal management effect of the battery pack to a certain extent.

[0058] In some embodiments, the distribution of the heat exchange channels 1411 in the metal plate can be set according to the heat exchange requirements. Figure 4 As shown, the heat exchange channel 1411 can be distributed throughout the metal plate in a zigzag shape.

[0059] Compared with the solution in the related art that requires the use of metal beams to provide support in the battery pack, in the battery pack proposed in the embodiment of the present application, the liquid cooling integrated plate 140 can provide support for the battery shell 100, and there is no need to set up separate metal beams and other structures, which can improve the space utilization of the battery pack and increase the energy density of the battery pack.

[0060] In some embodiments, the liquid-cooled integrated plate 140 not only integrates multiple functions such as heat exchange, structural support, and absorption of expansion deformation, enabling the battery pack to no longer require a separate crossbeam for structural support, a plastic part for absorbing the expansion deformation of the battery cell module 200, and a liquid-cooled plate 141 for heat exchange function. The liquid-cooled integrated plate 140 can replace multiple structures such as the crossbeam, plastic part, and liquid-cooled plate 141. At the same time, the self-structure of the liquid-cooled integrated plate 140 is compact, which can greatly improve the space utilization rate of the battery pack, increase the energy density of the battery pack, and thus improve the cruising range of the entire electric vehicle.

[0061] In some embodiments, as Figure 1 shown, through the liquid-cooled integrated plate 140, a rectangular side plate 130 frame of the battery case 100 can be formed. The rectangular side plate 130 frame has multiple functions of structural support, heat exchange, and absorption of expansion deformation, which can improve the integration degree of the entire battery pack, as well as the space utilization rate and energy density of the battery pack.

[0062] As an alternative embodiment, as Figures 1 to 4 shown, a thermal conductive adhesive layer 143 is provided on the side of the liquid-cooled integrated plate 140 adjacent to the battery cell module 200.

[0063] In some embodiments, a thermal conductive adhesive layer 143 is provided on the side of the liquid-cooled integrated plate 140 adjacent to the battery cell module 200. By conducting heat through the thermal conductive adhesive layer 143 and bonding with the battery cell module 200, the heat exchange efficiency between the battery cell module 200 and the liquid-cooled integrated plate 140 can be increased, and thus the overall heat exchange efficiency of the battery pack can be improved.

[0064] As an alternative embodiment, as Figures 1 to 4 shown, a liquid-cooled integrated plate 140 is provided between two adjacent battery cell modules 200.

[0065] In some embodiments, as Figures 1 to 4 shown, a liquid-cooled integrated plate 140 is provided between two adjacent battery cell modules 200. On the one hand, the liquid-cooled integrated plate 140 between two adjacent battery cell modules 200 can be used to increase the overall heat exchange area and heat exchange efficiency of the battery pack; on the other hand, it can improve the heat exchange efficiency of a single battery cell module 200, especially the battery cell module 200 located in the middle part, and avoid the risk of heat accumulation due to the relatively long distance between individual battery cell modules 200 and the liquid-cooled integrated plate 140; in addition, the liquid-cooled integrated plate 140 between two adjacent battery cell modules 200 can also absorb the expansion deformation amount between these two adjacent battery cell modules 200.

[0066] Based on the same inventive concept, an embodiment of the present application also proposes an electric vehicle, which may include the above-mentioned battery pack.

[0067] Since the electric vehicle provided by the present invention includes the battery pack of the above technical solution, the electric vehicle provided by the present invention has all the beneficial effects of the above battery pack, which will not be elaborated herein.

[0068] In this application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0069] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application.

[0070] It should be noted that all the directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly.

[0071] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0072] In addition, in this application, descriptions such as "first" and "second" are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0073] In the description of this specification, descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0074] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0075] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of this application. The scope of this application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, The battery pack includes: A battery case; At least two battery cell modules, which are arranged in the battery case at least along a first direction, and an explosion-proof valve is provided at the bottom of the battery cell module; and, A mica plate, which is arranged in the battery case and located between the bottom of the battery cell module and the battery case, and a pressure relief valve corresponding to the position of the explosion-proof valve is provided on the mica plate; Wherein, the battery case includes a top plate, a bottom plate corresponding to the top plate, and side plates connected between the top plate and the bottom plate. The bottom plate is spaced from the mica plate. The bottom plate includes a protection part corresponding to the position of the pressure relief valve and an exhaust hole offset from the pressure relief valve, so that the high-temperature and high-pressure gas and ejecta discharged by the pressure relief valve are discharged outside the battery case through the exhaust hole and into the atmosphere; the bottom plate is a hot-formed steel plate, and the exhaust hole is strip-shaped; the remaining part of the hot-formed steel plate forms a strip-shaped protection part corresponding to the pressure relief valve on the mica plate; the mica plate is in contact with the bottom of the battery cell module.

2. The battery pack according to claim 1, characterized in that, The battery pack further includes high-voltage components, and the high-voltage components are arranged on the top or side of the battery cell module.

3. The battery pack according to claim 1 or 2, characterized in that, The side plates include two end plates arranged along the first direction and two side plates adjacent to the end plates, and the end plates and / or the side plates are liquid-cooling integrated plates.

4. The battery pack according to claim 1, characterized in that, The liquid-cooling integrated plate includes two liquid-cooling plates arranged in a stacked manner and a heat-conducting pad arranged between the two liquid-cooling plates, and the heat-conducting pad has compressibility.

5. The battery pack according to claim 4, wherein, The liquid-cooling plate is a metal plate, and a heat exchange flow channel is formed in the metal plate.

6. The battery pack according to claim 4, characterized in that, A heat-conducting adhesive layer is provided on the side of the liquid-cooling integrated plate adjacent to the battery cell module.

7. The battery pack according to claim 4, wherein The liquid-cooling integrated plate is provided between two adjacent battery cell modules.

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