Battery pack

Abstract

Battery pack comprising: a housing comprising a base plate and a side wall plate, the side wall plate being connected to the circumferential side of the base plate, the base plate and the side wall plate enclosing a receiving cavity and a plurality of independently arranged first grooves being formed on a surface of the base plate facing the receiving cavity; a cell module being arranged in the receiving cavity and comprising several sub-modules, wherein a pressure relief chamber is formed between the underside of one of the sub-modules and one of the first grooves, the sub-module comprising a cell the underside of which is provided with a pressure relief valve, the opening of which is connected to the pressure relief chamber.

Description

TECHNICAL FIELDThe present application relates to the technical field of batteries, and more particularly, to a battery pack.PRIOR ARTWhen thermal runaway occurs at one of the cells in the battery pack, a pressure relief valve at the bottom of the cell where thermal runaway occurs sprays combustible gas and flames. The bottoms of all cells in the conventional battery pack are integrally connected to each other, resulting in the chain-like thermal runaway of other cells and then the firing of the entire battery pack.DISCLOSURE OF THE INVENTIONTechnical ProblemThe embodiment of the present application provides a battery pack that can improve the technical problem of thermal runaway of a single cell of the battery pack and the chain-like thermal runaway caused thereby.Technical SolutionThe present application provides a battery pack. It comprises a housing comprising a bottom plate and a side wall plate connected to the peripheral side of the bottom plate, the bottom plate and the side wall plate enclosing a receiving cavity and a plurality of independently arranged first grooves being formed on a surface of the bottom plate facing the receiving cavity; a cell module arranged in the receiving cavity and comprising a plurality of sub-modules, a pressure relief chamber being formed between the bottom side of one of the sub-modules and one of the first grooves, the sub-module comprising a cell whose bottom side is provided with a pressure relief valve whose opening is connected to the pressure relief chamber.Advantageous Effects:Advantageous effects of the present application: In the embodiment of the present application, the battery pack specifically includes a housing and a cell module. The housing comprises a bottom plate and a side wall plate connected to the peripheral side of the bottom plate, the bottom plate and the side wall plate enclosing a receiving cavity, and a plurality of independently arranged first grooves are formed on a surface of the bottom plate facing the receiving cavity; the cell module is arranged in the receiving cavity and comprises a plurality of sub-modules, a pressure relief chamber being formed between the bottom side of one of the sub-modules and one of the first grooves, the sub-module comprising a cell whose bottom side is provided with a pressure relief valve whose opening is connected to the pressure relief chamber.Thus, in the application, a plurality of independently arranged first grooves are formed directly on the bottom plate of the housing, so that the pressure relief chamber formed between the bottom of each sub-module and a first groove is also relatively independent, and then the ports of the pressure relief valves of a plurality of sub-modules are connected to the corresponding pressure relief chambers, respectively. In this way, when the cell is thermally passed through, one of the sub-modules can be effectively prevented from spreading the flame and the high temperature gas to the cells of the other sub-modules, and then a chain-like thermal pass caused by the thermal pass of a single cell of the battery pack can be improved and the overall safety of the battery pack can be improved.SUMMARY OF THE INVENTIONFIG. 1 is a schematic three-dimensional structural diagram of a battery pack of an embodiment of the present application; FIG. 2 is an exploded schematic diagram of the battery pack of an embodiment of the present application; FIG. 3 is a schematic sectional view of the battery pack of an embodiment of the present application; FIG. 4 is an enlarged schematic structural diagram of the location A of FIG. 3 ; FIG. 5 is another schematic sectional view of the battery pack of an embodiment of the present application; FIG. 6 is a schematic three-dimensional structural diagram of a case of the battery pack of an embodiment of the present application; FIG. 7 is a schematic plan view of the case of the battery pack of an embodiment of the present application; FIG. 8 is a schematic assembly drawing of a flow guide plate of the battery pack of an embodiment of the present application; FIG. 9 is an enlarged schematic structural diagram of the location B of FIG. 8 ; FIG. 10 is a schematic assembly diagram of a flame retardant layer of the battery pack of an embodiment of the present application.Description of the reference numerals: battery pack 100, housing 10, base plate 11, first groove 111, first notch 1111, second notch 1112, second groove 112, third groove 113, rib bar 114, side wall plate 12, explosion-proof valve 121, partition bar 13, reinforcing bar 14, accommodation cavity 10 a, cell module 20, sub-module 21, cell 211, pressure limiting valve 2111, bracket 212, sealing plate 30, through hole 31, flame retardant layer 40, flow guide plate 50, air flow channel 50 a, pressure relief chamber 60, pressure relief sub-chamber 61, first pressure relief channel 70, second pressure relief channel 80.Embodiments of the InventionIn the present application, the terms "connected to each other", "connecting", "fastening" or the like are intended to be understood in the broader sense unless expressly stated otherwise. Thus, for example, this can be a fixed, a releasable or a one-piece connection as well as a mechanical and also an electrical connection. In addition, direct connections, indirect connections or connections produced via an intermediate piece, as well as internal connections of two elements or interactions of two elements are also conceivable. One of ordinary skill in the art can be based on the subject to determine what meaning the terms mentioned according to the present application are intended to have.In the present application, a first feature disposed "above" or "below" a second feature may be, unless expressly stated and defined otherwise, the case that the first feature directly contacts the second feature or that the first and second features contact without direct contact via another feature disposed therebetween. Moreover, in the case of the first feature, which is arranged "on", "above" the second feature and "above" the second feature, it may be the case, inter alia, that the first feature lies directly above and obliquely above the second feature, or that the horizontal height position of the first feature is higher than that of the second feature. In the case of the first feature, which is arranged "under" the second feature and "below" the second feature, it may be the case, inter alia, that the first feature lies directly under and obliquely under the second feature, or that the horizontal height position of the first feature lies lower than that of the second feature.In the description of the present embodiment, the terms "upper", "lower", "left", "right", etc. are used with reference to the illustrated orientation or positional relationship in each figure to describe only the operation and simplify the description as appropriate. In other words, these terms are used to indicate neither in-depth nor explicitly the positioning and the configuration and operation of the relevant device or of the relevant element in a predetermined positioning, and therefore there is also no restriction of the application here. Moreover, the terms "first" and "second" having no particular meaning are used only to achieve distinction in the description.An embodiment of the present application provides a battery pack 100. A more detailed description will be given below. It should be noted that the order of the embodiments described below does not limit the priority order of the embodiments at all.Referring to FIGS. 1 to 4, the battery pack 100 provided by an embodiment of the present application includes a case 10 and a cell module 20. the case 10 includes a bottom plate 11 and a side wall plate 12 connected to the circumferential side of the bottom plate 11, the bottom plate 11 and the side wall plate 12 enclosing a receiving cavity 10 a, and a plurality of independently disposed first grooves 111 are formed on a surface of the bottom plate 11 facing the receiving cavity 10 a. The cell module 20 is arranged in the receiving cavity 10 aand comprises a plurality of sub-modules 21, wherein a pressure relief chamber 60 is formed between the bottom of one of the sub-modules 21 and one of the first grooves 111, wherein the sub-module 21 comprises a cell 211, the bottom of which is provided with a pressure relief valve 2111, the opening of which is connected to the pressure relief chamber 60.Thus, in the application, a plurality of independently arranged first grooves 111 are formed directly on the bottom plate 11 of the housing 10, so that the pressure relief chamber 60 formed between the bottom of each sub-module 21 and a first groove 111 is also relatively independent, and then the ports of the pressure relief valves 2111 of a plurality of sub-modules 21 are respectively connected to the corresponding pressure relief chambers 60. In this way, when the cell 211 of one of the sub-modules 21 is thermally passed, the flame and the high temperature gas can be effectively prevented from spreading on the cells 211 of the other sub-modules 21, and then a chain-like thermal pass caused by the thermal pass of a single cell 211 of the battery pack 100 can be improved and the overall safety of the battery pack 100 can be improved.Here, the bottom plate 11 and the side wall plate 12 of the housing 10 may be a one-piece structure to ensure stability of the housing 10 when supporting the cell module 20. At the same time, the housing 10 may also include a cover plate, and the bottom plate 11 is positioned at the bottom of the side wall plate 12, and the cover plate is connected to the top of the side wall plate 12 so as to cover the accommodation cavity 10 aand thereby protect the cell module 20. The housing 10 can be made of high temperature resistant materials such as steel sheet, which further improves the fire resistance of the housing 10. The first groove 111 may be concaved by punching on the surface of the bottom plate 11 facing the accommodation cavity 10 a. The cell module 20 includes a plurality of sub-modules 21, and the plurality of sub-modules 21 may be connected in parallel or in series so that the battery pack 100 satisfies the rated voltage and current requirements.Moreover, the housing 10 further includes a partition beam 13 and a reinforcement beam 14, and the partition beam 13 is connected to the two opposing surfaces of the side wall plate 12 facing the accommodation cavity 10 a. By providing the partition beam 13, the accommodation cavity 10 aof the housing 10 can be divided into two accommodation cavities, one accommodation cavity being used to accommodate the cell module 20 and the other accommodation cavity being used to place other components in the battery assembly, such as battery management system and battery thermal management system, etc. The separating beam 13 may be a hollow structure. Thus, by forming the partition beam 13 as a hollow structure, heat insulation can be prevented from spreading the heat in the two accommodation cavities to the other.The reinforcing beam 14 can be fixed to the two opposing surfaces of the side wall plate 12 facing the accommodation cavity 10 aby welding and other means, and the reinforcing beam 14 and the cell module 20 are located in the same accommodation cavity. By providing the reinforcing beam 14, not only the stability of the case 10 in supporting the cell module 20 is improved, but also the stability of the overall structure of the battery pack 100 is improved when thermal runaway of the battery cell 211 occurs and the pressure is released.Referring to FIGS. 2 to 4, the battery pack 100 optionally further includes a seal plate 30, wherein the seal plate 30 is disposed in the accommodation cavity 10 aand is located between the lower surfaces of a plurality of sub-modules 21 and the bottom plate 11, and the seal plate 30 covers the openings of a plurality of first grooves 111. The seal plate 30 is provided with a through hole 31 associated with the opening of the relief valve 2111 of the cell 211, the through hole 31 penetrating the seal plate 30.By providing the seal plate 30 to cover the openings of the first grooves 111, not only the separation effect of the plurality of pressure relief chambers 60 is further improved, but also the effect of blocking flame propagation to other sub-modules 21 is further avoided. The seal plate 30 is provided with a through hole 31 corresponding to the opening of the relief valve 2111, so that when thermal runaway occurs in the cell 211, the flame can be directly ejected from the opening of the relief valve 2111 and directly enters the relief chamber 60 from the through hole 31, thereby preventing the flame from spreading to other positions on the bottom of the cell 211. The seal plate 30 may also be made of high temperature resistant materials such as steel sheet to improve the fire resistance of the seal plate 30. Note that the shape of the through hole 31 may be adjusted to the shape of the relief valve 2111. For example, when the shape of the relief valve 2111 is round, the shape of the through hole 31 may also be roundly adjusted. The diameter of the through hole 31 may be equal to or larger than the diameter of the opening of the relief valve 2111, so that the high temperature gas and the flame can be shot into the relief chamber 60 freely.Optionally, the seal plate 30 and the bottom plate 11 are fixed by friction stir welding. At this time, the seal plate 30 can be fixed on the bottom plate 11 by friction stir welding, which can not only reduce deformation of the housing 10 due to the joining, but also prevent accumulation of welding slag interfering with assembly.Moreover, the sub-module 21 further includes a bracket 212, the bracket 212 is fixed to the seal plate 30 by a detachable connection such as screws, the bracket 212 is provided with a bearing part corresponding to the shape of the cell 211, the cell 211 is disposed in the bearing part, and the bearing part is provided with a through hole connected to the opening of the relief valve 2111. The material of the holder 212 can be plastic and other flame-retardant materials are also conceivable.Referring to FIGS. 5 to 7, a second groove 112 is optionally formed on the surface of the bottom plate 11 facing the receiving cavity 10 a, and a first pressure relief channel 70 is formed between the sealing plate 30 and the second groove 112. A first notch 1111 is disposed on the groove wall of the first groove 111 in the vicinity of the second groove 112, and the first pressure relief passage 70 is connected to the pressure relief chamber 60 through the first notch 1111. In this manner, a second groove 112 is formed on the bottom plate 11 and a first pressure relief passage 70 is formed by cooperation with the seal plate 30, so that when the cell 211 of one of the sub-modules 21 is thermally leaked, the high temperature gas leaked from the pressure relief valve 2111 enters the corresponding pressure relief chamber 60, and then, because the first pressure relief passage 70 is connected to the pressure relief chamber 60, the high temperature gas can be introduced into the first pressure relief passage 70 to release gas and pressure in the pressure relief chamber 60 and thus prevent the continuous accumulation of high temperature gas to effectively reduce the occurrence of violent burns and explosions. Note that the second groove 112 may be formed by punching, like the first groove 111.Further, a plurality of first grooves 111 are arranged at intervals in the same direction, and the second grooves 112 are located at the same end of a plurality of first grooves 111. Here, the plurality of first grooves 111 may be arranged at intervals along a direction parallel to one side of the floor panel 11, so that a plurality of sub-modules 21 are arranged at intervals along the direction, respectively, so that installation of a plurality of sub-modules 21 is more convenient. By having the second groove 112 at the same end of the first groove 111 so that the path of high temperature airflow from each pressure relief chamber 60 to the first pressure relief passage 70 is the same, the pressure relief efficiency of each pressure relief chamber 60 is the same. It should be noted that, in another embodiment, the plurality of first grooves 111 may also be arranged in a matrix manner and distributed symmetrically on opposite sides of the second groove 112. In this way, installation of a plurality of sub-modules 21 becomes more concentrated, and the overall volume of the battery pack 100 can be effectively reduced.Referring to FIGS. 4, 6 and 7, the bottom plate 11 is optionally provided with at least one rib 114 at the bottom of the groove of the first groove 111, the end surface of the rib 114 facing away from the groove bottom abuts against the sealing plate 30. The rib 114 divides the pressure relief chamber 60 into a plurality of pressure relief sub-chambers 61, and the pressure relief sub-chamber 61 is connected to the first pressure relief passage 70. The sub-module 21 comprises at least two rows of cells 211, and a depressurizing sub-chamber 61 is connected to the opening of the pressure relief valve 2111 of a row of cells 211.In this manner, the rib 114 may be used to receive the sealing plate 30, and further the rib 114 divides the pressure relief chamber 60 into a plurality of pressure relief sub-chambers 61 such that the smaller-sized pressure relief sub-chamber 61 is separately associated with a row of cells 211 in the same sub-module 21, respectively. When thermal runaway of a cell 211 occurs in the submodule 21, the propagation of the flame to the other-row cell 211 can be effectively reduced, and the other-row cell 211 from ignition is avoided, thus reducing the combustion intensity and shortening the combustion time. In the present embodiment, the number of the rib 114 is 4, thereby dividing the pressure relief chamber 60 into 5 independent pressure relief sub-chambers 61. The submodule comprises 5 rows of cells 211, and one row of cells 211 is associated with a pressure relief subchamber 61. The number of the rib 114 may be set according to the requirements of the cell 211 of the sub-module 21, and the application does not limit the number of the rib 114.Optionally, the bottom plate 11 is concaved toward the receiving cavity 10a, thereby forming the rib 114. Here, the rib 114 may be formed by punching the bottom plate 11 to secure the strength and stability of the rib 114.Further, the rib 114 extends toward the first notch 1111, and the rib 114 is disposed spaced apart from the groove wall of the first groove 111 provided with the first notch 1111. In this way, the rib 114 is extended toward the first notch 1111, so that when thermal runaway occurs at the cell 211 in a row of the sub-module 21, the high temperature gas in the corresponding pressure relief sub-chamber 61 can flow in a defined direction toward the position of the first notch 1111 and then flow to the first pressure relief passage 70 to improve pressure relief efficiency.Optionally, referring to FIGS. 8 and 9, the side wall plate 12 is provided with an explosion-proof valve 121, and the battery pack 100 further includes a flow guide plate 50, wherein the flow guide plate 50, the side wall plate 12, and the bottom plate 11 enclose an air flow channel 50 aconnected to the explosion-proof valve 121 and the first pressure relief channel 70.At this time, the seal plate 30 may partially expose the opening of the second groove 112 and then form the air flow channel 50 awith the side wall plate 12 and the bottom plate 11 by disposing the flow guide plate 50, and the opening of the exposed second groove 112 is connected to the air flow channel 50 a. In this way, after high temperature gas is generated upon thermal runaway and has flowed from the pressure relief chamber 60 to the first pressure relief passage 70, the high temperature gas can flow to the air flow passage 50 aalong the first pressure relief passage 70 and flow to the explosion-proof valve 121 on the side wall plate 12 along the air flow passage 50 awhen the pressure in the air flow passage 50 areaches the detonation pressure value of the explosion-proof valve 121, gas is discharged through the explosion-proof valve 121, thereby avoiding the expansion and explosion of the battery pack 100, and then improving the safety performance of the battery pack 100. The number of explosion-proof valve 121 may be more than one to further improve the pressure release efficiency. As shown by the arrow in FIG. 8, the arrow shows the flow direction of the high temperature gas, and after the high temperature gas reaches the first pressure relief passage 70 from the pressure relief groove, it further reaches the air flow passage 50 aalong the first pressure relief passage 70 and then flows through the air flow passage 50 ato the position of the pressure relief valve 2111.Optionally, the flow guide plate 50 is welded and fixed to the side wall plate 12. At this time, the flow guide plate 50 may be joined to the side wall plate 12 by welding and other means to improve the stability of the flow guide plate 50 after installation and further improve the effect of simultaneously sealing the airflow passage 50 a.Note that in other embodiments, an explosion-proof valve 121 may also be disposed directly on the bottom plate 11 and the explosion-proof valve 121 is connected to the second groove 112, so that the high-temperature gas, when flowing into the second groove 112, can flow out and be discharged to the outside through the explosion-proof valve 121 more quickly.Referring to FIGS. 7 to 9, a third groove 113 is formed on the surface of the bottom plate 11 facing the accommodation cavity 10 a, and the third groove 113 is located at an end of the first groove 111 opposite to the second groove 112 and extends to the side wall plate 12, and a second pressure relief passage 80 is formed between the seal plate 30 and the third groove 113, the second pressure relief passage 80 being connected to the pressure relief chamber 60 and the air flow passage 50 a.Here, the third groove 113 and the second groove 112 are symmetrically disposed at opposite ends of the first groove 111, and the groove wall of the first groove 111 facing away from the second groove 112 is provided with a second notch 1112 connected to the third groove 113. At the same time, the seal plate 30 cooperates with the third groove 113 to form the second pressure relief passage 80, and the second pressure relief passage 80 is connected to a plurality of pressure relief chambers 60. At the same time, the seal plate 30 may partially expose the opening of the third groove 113, and then the air flow channel 50 aformed by the flow guide plate 50, the side wall plate 12, and the bottom plate 11 is connected to the opening of the exposed opening of the third groove 113. In this way, when thermal runaway occurs in one of the cells 211, the high temperature gas can be introduced from the pressure relief chamber 60 into the first pressure relief passage 70 and the second pressure relief passage 80, respectively, to further improve the gas discharge and pressure relief efficiency of the pressure relief chamber 60, to further avoid the continuous accumulation of high temperature gas, and to effectively reduce the occurrence of violent combustion and explosion.Referring to FIGS. 2 and 10, the battery pack 100 further includes a flame retardant layer 40 that is disposed between the sealing plate 30 and the sub-module 21 and covers the plurality of through holes 31.By providing the flame retardant layer 40, it is achieved that when the high temperature gas and the flame in the pressure limiting valve 2111 of a cell 211 break through the pressure limiting valve 2111 and are ejected to the outside, the high temperature gas and the flame can break through the flame retardant layer 40 and then enter the corresponding first groove 111 through the through hole 31. Therefore, since the pressure limiting valve 2111 of the adjacent non-thermal runaway cell 211 and the first groove 111 are separated by the flame retardant layer 40, the other non-thermal runaway cells 211 can be left unaffected by high temperature gas and flame to avoid the technical problem of the chain-like thermal runaway. Note that the flame retardant layer 40 may be formed by splicing a plurality of flame retardant sub-layers, i.e., a flame retardant sub-layer may be associated with one or more sub-modules 21, so that the flame retardant sub-layer which has been separately damaged may be replaced subsequently. Further, the material of the flame retardant layer 40 is mica. The flame retardant mica layer 40 can not only ensure the fire performance but also effectively prevent a large thickness of the flame retardant layer 40. Of course, the material of the flame retardant layer 40 may be other materials having flame retardant effect. The material selection of the flame retardant layer 40 can be determined according to the flame retardant class UL94-V0, which is not limited in this application.Further, the thickness of the flame retardant layer 40 is less than the thickness of the seal plate 30, and the seal plate 30 is a flat plate structure, and the thickness of the flame retardant layer 40 and the thickness of the seal plate 30 refer to the dimensions perpendicular to the direction of the planar surface of the seal plate 30. By making the thickness of the flame retardant layer 40 smaller than the thickness of the sealing plate 30, the thickness of the flame retardant layer 40 covering the through hole 31 is not so large, so that breakage by the high temperature gas and the flame is difficult.

Claims

A battery pack comprising: a case comprising a bottom plate and a side wall plate, the side wall plate being connected to the peripheral side of the bottom plate, the bottom plate and the side wall plate enclosing a receiving cavity, and a plurality of independently disposed first grooves are formed on a surface of the bottom plate facing the receiving cavity; a cell module disposed in the receiving cavity and comprising a plurality of sub-modules, wherein a pressure relief chamber is formed between the bottom of one of the sub-modules and one of the first grooves, the sub-module comprising a cell whose bottom is provided with a pressure relief valve whose opening is connected to the pressure relief chamber.The battery pack of claim 1, wherein the battery pack further comprises a seal plate, the seal plate being disposed in the accommodation cavity and located between the bottom surfaces of the plurality of sub-modules and the bottom plate, the seal plate covering the openings of the plurality of first grooves; wherein the seal plate is provided with a through hole, the through hole being associated with the opening of the relief valve of the cell, the through hole penetrating the seal plate.The battery pack of claim 2, further comprising a second groove formed on the surface of the bottom plate facing the receiving cavity, wherein a first pressure relief passage is formed between the sealing plate and the second groove, wherein a first notch is disposed on the groove wall of the first groove facing the second groove, and the first pressure relief passage is connected to the pressure relief chamber through the first notch.The battery pack of claim 3, wherein the plurality of first grooves are arranged at intervals in the same direction, and the second groove is arranged at the same end of the plurality of first grooves.The battery pack of claim 3 or 4, wherein the bottom plate is provided with at least one rib at the groove bottom of the first groove, an end surface of the rib facing away from the groove bottom abuts against the sealing plate, the rib partitioning the pressure relief chamber into a plurality of pressure relief sub-chambers connected to the first pressure relief channel; wherein the sub-module comprises at least two cell rows, one of the pressure relief sub-chambers being connected to the openings of the pressure relief valves of one of the cell rows.The battery pack of claim 5, wherein the rib extends in a direction facing the first notch, and the rib is spaced apart from the groove wall of the first groove provided with the first notch.The battery pack of claim 5 or 6, wherein the bottom plate is concave toward the receiving cavity to form the rib.The battery pack according to any one of claims 2 to 7, wherein the seal plate and the bottom plate are fixed by friction stir welding.The battery pack of any one of claims 3 to 8, wherein the side wall plate is provided with an explosion-proof valve, and the battery pack further comprises a flow guide plate, wherein the flow guide plate, the side wall plate, and the bottom plate enclose an air flow channel, wherein the air flow channel is connected to the explosion-proof valve and the first pressure relief channel.The battery pack of claim 9, wherein the flow guide plate is welded and fixed to the side wall plate.The battery pack of claim 9 or 10, wherein the surface of the bottom plate facing the receiving cavity is provided with a third groove located at an end of the first groove opposite to the second groove; wherein a second pressure relief passage is formed between the sealing plate and the third groove, and wherein the second pressure relief passage is connected to the pressure relief chamber and the airflow passage.The battery pack according to any one of claims 2 to 11, wherein the battery pack further comprises a flame retardant layer that is disposed between the sealing plate and the sub-module and covers the plurality of through holes.The battery pack of claim 12, wherein the thickness of the flame retardant layer is less than the thickness of the sealing plate.The battery pack according to any one of claims 3 to 13, wherein the bottom plate is provided with an explosion-proof valve, and the explosion-proof valve is connected to the second groove.The battery pack of any one of claims 1 to 14, wherein the housing further comprises a cover plate, wherein the bottom plate is located at the bottom of the side wall plate, and the cover plate is connected to the top of the side wall plate.The battery pack of claim 15, wherein the bottom plate and the side wall plate are a one-piece structure.The battery pack of any one of claims 1 to 16, wherein the housing further comprises a separating bar, and the separating bar is connected to the two opposing surfaces of the side wall plate facing the receiving cavity; wherein the separating bar divides the receiving cavity into at least two receiving cavities, one of which is used to receive the cell module.The battery pack of claim 17, wherein the separating beam is a hollow structure.The battery pack of claim 17 or 18, wherein the housing further comprises a reinforcing beam, and the reinforcing beam is fixed to the two opposing surfaces of the side wall plate facing the accommodation cavity; wherein the reinforcing beam and the cell module are located in the same accommodation cavity.The battery pack according to any one of claims 2 to 19, wherein the sub-module further comprises a bracket detachably connected to the seal plate, the bracket being provided with a bearing part corresponding to the shape of the cell, the cell being disposed in the bearing part, and the bearing part being provided with a through hole connected to the opening of the pressure limiting valve.

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