Battery pack

Abstract

The invention provides a battery pack, and relates to the technical field of batteries. The battery pack comprises a shell, a cross beam, a battery cell group and a heat exchange assembly; the cross beam is arranged in the shell and connected to the shell, a first accommodating cavity is defined by the cross beam and the shell, and the battery cell group is arranged in the first accommodating cavity; the heat exchange assembly comprises a first heat exchange piece, a second heat exchange piece and a connecting piece, in the second direction, the first heat exchange piece is arranged on one side of the battery cell group and is in heat exchange connection with the battery cell group, and the second heat exchange piece is arranged on the other side of the battery cell group and is in heat exchange connection with the battery cell group; the connecting piece penetrates through the cross beam, and in the second direction, one end of the connecting piece is connected to the first heat exchange piece, and the other end of the connecting piece is connected to the second heat exchange piece. According to the battery pack, the connecting piece is arranged in the internal space of the cross beam, so that the connecting piece is prevented from additionally occupying the arrangement space of the battery cell group in the first accommodating cavity, and the energy density of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery pack. BACKGROUND

[0002] The battery pack comprises a beam, a cell group and a heat exchange assembly, the beam is used for enhancing the structural strength of the battery pack and inhibiting the lateral expansion of the cell group, and the heat exchange assembly is used for heat management of the cell group.

[0003] The beam and the heat exchange assembly are independently arranged, which occupies the arrangement space of the cell group in the battery pack, resulting in the reduction of the energy density of the battery pack. SUMMARY

[0004] The present application aims to provide a battery pack, which at least solves the problem that the beam and the heat exchange assembly are independently arranged, which occupies the arrangement space of the cell group in the battery pack, resulting in the reduction of the energy density of the battery pack.

[0005] In order to solve the above technical problems, the present application is implemented as follows: In a first aspect, the embodiments of the present application provide a battery pack having a second direction, comprising: a shell, a beam, a cell group and a heat exchange assembly; The beam is arranged in the shell and connected to the shell, the beam and the shell form a first accommodating cavity, and the cell group is arranged in the first accommodating cavity; The heat exchange assembly comprises a first heat exchange member, a second heat exchange member and a connecting member, along the second direction, the first heat exchange member is arranged on one side of the cell group and is heat exchange connected to the cell group, and the second heat exchange member is arranged on the other side of the cell group and is heat exchange connected to the cell group; The connecting member is arranged through the beam, along the second direction, one end of the connecting member is connected to the first heat exchange member, and the other end of the connecting member is connected to the second heat exchange member.

[0006] Optionally, the connecting member comprises a first connecting member, a second connecting member and a third connecting member; The third connecting member is arranged through the beam, along the second direction, one end of the first connecting member is connected to the first heat exchange member, the other end of the first connecting member is arranged through the beam and connected to the third connecting member, one end of the second connecting member is connected to the second heat exchange member, and the other end of the second connecting member is arranged through the beam and connected to the third connecting member.

[0007] Optionally, the battery pack further has a first direction, the first direction and the second direction are perpendicular to each other, the third connecting member comprises a deformation part, and the deformation part is configured to be deformable at least along the first direction.

[0008] Optionally, the third connecting member comprises a first connecting pipe and a second connecting pipe. In the second direction, one end of the first connecting member is inserted into one end of the second connecting pipe, and one end of the second connecting member is inserted into the other end of the second connecting pipe, and the first connecting pipe is sleeved on the outer circumferential side of the second connecting pipe.

[0009] Optionally, the hardness of the first connecting pipe is greater than the hardness of the second connecting pipe.

[0010] Optionally, the second connecting pipe comprises a first guide portion, a second guide portion, and a connecting portion, and the connecting portion is arranged through the cross beam. In the second direction, one end of the first guide portion is connected to one end of the connecting portion close to the first connecting member, the first connecting member is arranged through the first guide portion and is inserted into the connecting portion, and one end of the second guide portion is connected to one end of the connecting portion close to the second connecting member, and the second connecting member is arranged through the second guide portion and is inserted into the connecting portion.

[0011] Optionally, in the second direction, from one end of the first guide portion away from the connecting portion to one end of the first guide portion close to the connecting portion, the flow area of the first guide portion gradually decreases. And / or, in the second direction, from one end of the second guide portion away from the connecting portion to one end of the second guide portion close to the connecting portion, the flow area of the second guide portion gradually decreases.

[0012] Optionally, the first connecting pipe has a first limiting portion, and the second connecting pipe has a second limiting portion, and the first limiting portion and the second limiting portion are limitedly connected to limit the relative sliding of the first connecting pipe and the second connecting pipe in the second direction.

[0013] Optionally, the second connecting member has a third limiting protrusion, and the third limiting protrusion is arranged on the outer circumferential side of one end of the second connecting member away from the second heat exchange member. One end of the third connecting member close to the second heat exchange member abuts against the third limiting protrusion. Optionally, the first connecting member has a fourth limiting protrusion, and the fourth limiting protrusion is arranged on the outer circumferential side of one end of the first connecting member away from the first heat exchange member, and one end of the third connecting member close to the first heat exchange member abuts against the fourth limiting protrusion.

[0014] Optionally, the battery pack further has a first direction and a third direction, the third direction, the first direction and the second direction are perpendicular to each other, and the cross beam comprises a main body portion and a plurality of separation portions. The main body part is arranged in the shell and connected to the shell, the main body part and the shell enclose the first containing cavity, and the group of battery cells is arranged along the first direction and connected to the main body part. The main body part has a second containing cavity, a plurality of the reinforcing parts are arranged in the second containing cavity along the second direction and connected to the main body part, and the connecting piece is arranged in the plurality of reinforcing parts.

[0015] Optionally, the battery pack further has a first direction, the first direction and the second direction are perpendicular to each other, and the cross beam comprises a main body part and a plurality of reinforcing parts. The main body part is arranged in the shell and connected to the shell, the main body part and the shell enclose the first containing cavity, and the group of battery cells is arranged along the first direction and connected to the main body part. The main body part has a second containing cavity, a plurality of the reinforcing parts are arranged in the second containing cavity along the second direction and connected to the main body part, and the connecting piece is arranged in the plurality of reinforcing parts.

[0016] Optionally, the battery pack further has a first direction and a third direction, the third direction, the first direction and the second direction are perpendicular to each other, and the first heat exchange piece is provided in plurality, and the plurality of first heat exchange pieces are arranged along the third direction and spaced apart. The connecting piece is provided in plurality, the plurality of connecting pieces are arranged in the cross beam and spaced apart along the third direction, each connecting piece is connected to one first heat exchange piece, and the plurality of connecting pieces are connected to the second heat exchange piece.

[0017] In the embodiment of the present application, the cross beam is arranged in the shell and connected to the shell, the cross beam and the shell enclose the first containing cavity for mounting the group of battery cells, the cross beam can not only provide limiting for the group of battery cells, but also can inhibit the expansion trend of the group of battery cells. On this basis, the first heat exchange piece and the second heat exchange piece are respectively heat exchange connected to the two sides of the group of battery cells along the second direction, and then the connecting piece arranged in the cross beam is used to realize the uniform heat exchange of the first heat exchange piece and the second heat exchange piece to the group of battery cells. In this way, the internal space of the cross beam can be used to arrange the connecting piece, so as to avoid the additional occupation of the arrangement space of the group of battery cells in the first containing cavity, and the energy density of the battery pack is improved.

[0018] Additional aspects and advantages of the present application will be part of the following description, part will become apparent from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment description, wherein: Figure 1 Structure diagram of a battery pack provided for an embodiment of the present application Figure 1 ; Figure 2 Structure diagram of a battery pack provided for an embodiment of the present application Figure 2 ; Figure 3 Structure diagram of a battery pack provided for an embodiment of the present application Figure 2 Enlarged diagram of a part A Figure 4 Structure diagram of a heat exchange assembly provided for an embodiment of the present application Figure 5 Structure diagram of a second heat exchange member and a second connecting member provided for an embodiment of the present application Figure 6 Structure diagram of a heat exchange assembly provided for an embodiment of the present application Figure 5 Enlarged diagram of a part B Figure 7 Structure diagram of a first heat exchange member and a first connecting member provided for an embodiment of the present application Figure 8 Structure diagram of a heat exchange assembly provided for an embodiment of the present application Figure 7 Enlarged diagram of a part C Figure 9 Structure diagram of a third connecting member provided for an embodiment of the present application Figure 10 Sectional view diagram of a third connecting member provided for an embodiment of the present application Figure 11 Structure diagram of a main body part and a partition part provided for an embodiment of the present application Figure 12 Structure diagram of a main body part and a reinforcing part provided for an embodiment of the present application Figure 13 Front view diagram of a battery pack provided for an embodiment of the present application Figure 14 Structure diagram of a heat exchange assembly provided for an embodiment of the present application Figure 13 Enlarged diagram of a part D Figure 15 Structure diagram of an electrical component provided for an embodiment of the present application

[0020] Reference signs: 100: housing; 10a: first accommodating cavity 200: cross beam; 210: main body part; 220: partition part; 230: reinforcing part; 21a: second accommodating cavity; 21b: third accommodating cavity 300: battery cell group; 30a: geometric center 400: heat exchange assembly; 410: first heat exchange piece; 420: second heat exchange piece; 430: connecting piece; 431: first connecting piece; 432: second connecting piece; 433: third connecting piece; 4331: first connecting pipe; 4332: second connecting pipe; 4333: deformation part; 43321: first guide part; 43322: second guide part; 43323: connecting part; 43a: first limiting part; 43b: second limiting part; 43c: third limiting protrusion; 500: electrical component; d1: first distance; d2: second distance; X: first direction; Z: second direction; Y: third direction. DETAILED DESCRIPTION

[0021] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] This application provides a battery pack to solve some or all of the technical problems existing in the prior art. The battery pack provided in this application will be described in detail below with reference to the accompanying drawings and specific embodiments and application scenarios.

[0026] like Figures 1-3 As shown, a battery pack provided according to some embodiments of this application has a second direction Z and includes: a housing 100, a crossbeam 200, a cell assembly 300, and a heat exchange assembly 400; the crossbeam 200 is disposed inside the housing 100 and connected to the housing 100, and the crossbeam 200 and the housing 100 enclose a first receiving cavity 10a, and the cell assembly 300 is disposed inside the first receiving cavity 10a; the heat exchange assembly 400 includes a first heat exchange element 410, a second heat exchange element 420, and a connector 430. Along the second direction Z, the first heat exchange element 410 is disposed on one side of the cell assembly 300 and is heat-connected to the cell assembly 300, and the second heat exchange element 420 is disposed on the other side of the cell assembly 300 and is heat-connected to the cell assembly 300; the connector 430 passes through the crossbeam 200, and along the second direction Z, one end of the connector 430 is connected to the first heat exchange element 410, and the other end of the connector 430 is connected to the second heat exchange element 420.

[0027] In the embodiments of this application, a crossbeam 200 is disposed within and connected to the housing 100. The crossbeam 200 and the housing 100 enclose a first receiving cavity 10a for mounting the battery cell assembly 300. The crossbeam 200 not only provides a limit for the battery cell assembly 300 but also suppresses the expansion tendency of the battery cell assembly 300 toward the crossbeam 200. Based on this, a first heat exchanger 410 and a second heat exchanger 420 are respectively heat-exchange connected to both sides of the battery cell assembly 300 along the second direction Z. Then, with the help of a connector 430 passing through the crossbeam 200, uniform heat exchange between the first heat exchanger 410 and the second heat exchanger 420 on the battery cell assembly 300 is achieved. In this way, the internal space of the crossbeam 200 can be used to arrange the connector 430, avoiding the connector 430 from occupying additional space for the battery cell assembly 300 in the first receiving cavity 10a, thereby improving the energy density of the battery pack.

[0028] In some embodiments, the battery cell assembly 300 and the crossbeam 200 are arranged along a first direction X. More specifically, one end of the battery cell assembly 300 along the first direction X is connected to the crossbeam 200.

[0029] Specifically, the second direction Z can be understood as the height direction of the battery pack. In addition, the battery pack also has a first direction X and a third direction Y, the first direction X can be understood as the length direction of the battery pack, the third direction Y, the first direction X and the second direction Z are perpendicular to each other, and the third direction Y can be understood as the width direction of the battery pack.

[0030] The shell 100 is the outer contour structure of the battery pack, and the shell 100 can be a cuboid box structure or a cylindrical column structure, etc. The shell 100 is used to provide mounting reference and fixed carrier for the internal components, at the same time, to isolate external impurities and external impact and other environmental disturbances, and to ensure the stable operation of the internal components.

[0031] The cross beam 200 is arranged in the shell 100, and the cross beam 200 can be a hollow rectangular cross beam structure, an I-shaped cross beam structure or an extrusion cross beam structure. The cross beam 200 is connected with the inner wall of the shell 100 along at least one side end surface in the second direction Z, and / or the cross beam 200 is connected with the inner wall of the shell 100 along at least one side end surface in the third direction Y, and the connection mode can be welding, bolt connection or clamping, etc. The cross beam 200 is connected with the inner wall of the shell 100 along one side end surface in the first direction X to form a frame type first accommodating cavity 10a, and the first accommodating cavity 10a is used to provide mounting reference for the battery cell group 300.

[0032] The battery cell group 300 is arranged in the first accommodating cavity 10a, and the battery cell group 300 is composed of a plurality of single battery cells by series and parallel connection. The battery cell group 300 can be a square battery cell group, a cylindrical battery cell group or a soft package battery cell group, etc. One end of the battery cell group 300 is connected to the cross beam 200 along the first direction X, and the connection mode of the battery cell group 300 and the cross beam 200 can be bolt connection, glue joint or clamping, etc. The first heat exchange member 410 is heat exchange connected to the battery cell group 300, which can be that the first heat exchange member 410 is heat exchange connected to all single battery cells in the battery cell group 300, or the first heat exchange member 410 is heat exchange connected to part of the single battery cells in the battery cell group 300.

[0033] The heat exchange assembly 400 includes the first heat exchange member 410 and the second heat exchange member 420, and the first heat exchange member 410 and the second heat exchange member 420 are arranged on both sides of the battery cell group 300 along the second direction Z.

[0034] The first heat exchange member 410 is attached to the top wall or the bottom wall of the battery cell group 300 to realize heat transfer between the heat exchange medium in the first heat exchange member 410 and the battery cell group 300. Specifically, the first heat exchange member 410 can be a plate structure, a sheet micro-channel structure, or a hollow cavity structure, etc. The first heat exchange member 410 can absorb the heat generated during the charging and discharging of the battery cell group 300. Alternatively, when the ambient temperature is low and the charging and discharging performance of the battery cell group 300 is reduced, the first heat exchange member 410 can actively transfer heat to the battery cell group 300 to enhance the activity and charging and discharging efficiency of the battery cell group 300. The structure of the second heat exchange member 420 can be understood with reference to the structure of the first heat exchange member 410, which will not be described here.

[0035] In addition, the heat exchange assembly 400 further comprises a connecting member 430. The connecting member 430 can be a tubular structure, a sheet micro-channel structure, or a hollow cavity structure, etc. The connecting member 430 is arranged in the cross beam 200 and connected between the first heat exchange member 410 and the second heat exchange member 420 along the second direction Z. The connection mode can be threaded connection, clamping, insertion, or welding, etc. The first heat exchange member 410, the second heat exchange member 420, and the connecting member 430 form a circulation loop of the heat exchange medium in the heat exchange assembly 400. The heat exchange medium circulates in the circulation loop, which can improve the heat exchange uniformity of the first heat exchange member 410 and the second heat exchange member 420.

[0036] Optionally, as shown in Figures 4-8 The connecting member 430 comprises a first connecting member 431, a second connecting member 432, and a third connecting member 433. The third connecting member 433 is arranged in the cross beam 200 along the second direction Z. One end of the first connecting member 431 is connected to the first heat exchange member 410, and the other end of the first connecting member 431 is arranged in the cross beam 200 and connected to the third connecting member 433. One end of the second connecting member 432 is connected to the second heat exchange member 420, and the other end of the second connecting member 432 is arranged in the cross beam 200 and connected to the third connecting member 433. The connection between the first connecting member 431, the third connecting member 433, and the second connecting member 432 can be detachable connection or fixed connection, and is preferably detachable connection. It can be understood that the first connecting member 431 or the second connecting member 432 is arranged in the cross beam 200, and one end is located inside the cross beam 200 and the other end is located outside the cross beam 200. Whether the first connecting member 431 or the second connecting member 432 is directly connected to the cross beam 200 is not limited here.

[0037] In the embodiment of the present application, the first connecting piece 431 is first connected with the first heat exchange piece 410, and the second connecting piece 432 is connected with the second heat exchange piece 420, and then the first connecting piece 431 and the second connecting piece 432 are respectively connected with the third connecting piece 433 through the detachable connection of the first connecting piece 431 and the second connecting piece 432 with the third connecting piece 433, and the first connecting piece 431 and the second connecting piece 432 are respectively docked with the third connecting piece 433 in the narrow space of the cross beam 200. Through the segmented detachable connection mode of the first connecting piece 431, the second connecting piece 432 and the third connecting piece 433, the assembly operation difficulty of the connecting piece 430 is reduced, and the assembly efficiency between the first connecting piece 431, the second connecting piece 432 and the third connecting piece 433 is improved.

[0038] Specifically, the third connecting piece 433 is arranged in the cross beam 200, which can be fixedly connected with the cross beam 200, and during assembly of the connecting piece 430, the third connecting piece 433 is used as a positioning reference, and the first connecting piece 431 and the second connecting piece 432 are detachably connected with the third connecting piece 433; or the second heat exchange piece 420 is fixedly connected with the cross beam 200, and during assembly of the connecting piece 430, the second connecting piece 432 connected with the second heat exchange piece 420 is used as a positioning reference, and the third connecting piece 433 and the first connecting piece 431 are detachably connected with the second connecting piece 432 one by one; or the first heat exchange piece 410 is fixedly connected with the cross beam 200, and during assembly of the connecting piece 430, the first connecting piece 431 connected with the first heat exchange piece 410 is used as a positioning reference, and the third connecting piece 433 and the second connecting piece 432 are detachably connected with the first connecting piece 431 one by one. The detachable connection mode can be threaded connection, buckle connection or flange docking, etc.

[0039] The first heat exchange piece 410 has a preset connecting point, and the cross beam 200 has an opening. One end of the first connecting piece 431 is connected with the preset connecting point of the first heat exchange piece 410, the first connecting piece 431 is arranged in the opening of the cross beam 200 and located inside the cross beam 200, and the other end of the first connecting piece 431 is detachably connected with the third connecting piece 433. The connection mode of the first connecting piece 431 with the first heat exchange piece 410 can be non-detachable connection such as welding, integral molding or hinging, or detachable connection such as threaded connection, buckle connection or flange docking, etc.

[0040] The structure of the second connecting piece 432 can be understood with reference to the structure of the first connecting piece 431, which will not be described here. For example, in the second direction Z, the length of the second connecting piece 432 can be greater than the length of the first connecting piece 431, so that when the second connecting piece 432 is detachably connected with the third connecting piece 433, the connection position of the second connecting piece 432 and the third connecting piece 433 is closer to the assembly operation area of the assembly personnel or assembly equipment, which can further reduce the assembly operation difficulty of the connecting piece 430.

[0041] In other embodiments of the present application, the third connecting piece 433 is located on the cross beam 200 near one end of the first heat exchange piece 410 and detachably connected with the first connecting piece 431, and / or the third connecting piece 433 is located on the cross beam 200 near one end of the second heat exchange piece 420 and detachably connected with the second connecting piece 432.

[0042] Optionally, as shown in Figure 9 the battery pack also has a first direction X perpendicular to the second direction Z, the third connecting piece 433 includes a deformation part 4333 configured to be deformable at least along the first direction X, and the deformation part 4333 can be deformed to absorb installation tolerance.

[0043] In embodiments of the present application, the installation tolerance between the first connecting piece 431 and the second connecting piece 432 is absorbed by the deformation part 4333, further reducing the difficulty of assembly operation of the connecting piece 430.

[0044] Specifically, the deformation part 4333 extends along the second direction Z, and the deformation part 4333 can be a local annular structure in the third connecting piece 433, which can be an elastic rubber deformation part, a spring steel sheet deformation part or a bellows deformation part, etc. The deformation part 4333 is not directly connected with the first connecting piece 431 and the second connecting piece 432, or the deformation part 4333 is only connected with one of the first connecting piece 431 and the second connecting piece 432; the deformation part 4333 can also be a tubular structure sleeved on the first connecting piece 431 and the second connecting piece 432, and then the first connecting piece 431 is inserted into one end of the deformation part 4333 away from the first heat exchange piece 410, and the second connecting piece 432 is inserted into the other end of the deformation part 4333 away from the second heat exchange piece 420.

[0045] Optionally, as shown in Figure 10 the third connecting piece 433 includes a first connecting pipe 4331 and a second connecting pipe 4332; along the second direction Z, the first connecting piece 431 is inserted into one end of the second connecting pipe 4332 away from the first heat exchange piece 410, the second connecting piece 432 is inserted into the other end of the second connecting pipe 4332 away from the second heat exchange piece 420, and the first connecting pipe 4331 is sleeved on the outer circumferential side of the second connecting pipe 4332.

[0046] In the embodiment of the present application, at least part of the second connecting pipe 4332 can form a deformation part 4333. In the embodiment of the present application, since the two ends of the second connecting pipe 4332 in the second direction Z are respectively connected with the first connecting piece 431 and the second connecting piece 432, and the first connecting pipe 4331 is sleeved on the outer peripheral side of the second connecting pipe 4332, the second connecting pipe 4332 can be deformed relative to the first connecting pipe 4331 by means of the nested structure of the first connecting pipe 4331 and the second connecting pipe 4332, thereby absorbing the installation tolerance between the first connecting piece 431 and the second connecting piece 432, and providing support and mechanical protection for the second connecting pipe 4332 by the first connecting pipe 4331, thereby improving the reliability of the third connecting piece 433.

[0047] Specifically, the third connecting piece 433 includes a first connecting pipe 4331 and a second connecting pipe 4332, and the first connecting pipe 4331 is sleeved on the outer peripheral side of the second connecting pipe 4332. The first connecting pipe 4331 can provide rigid support for the second connecting pipe 4332 to prevent the second connecting pipe 4332 from being extruded and deformed by external force. Meanwhile, the first connecting pipe 4331 is also used to isolate the second connecting pipe 4332 from external mechanical impact, friction and other damages.

[0048] The two ends of the second connecting pipe 4332 in the second direction Z are respectively connected with the first connecting piece 431 and the second connecting piece 432. The second connecting pipe 4332 and the first connecting piece 431, and the second connecting pipe 4332 and the second connecting piece 432 form a plug-in sealing connection.

[0049] Optionally, the hardness of the first connecting pipe 4331 is greater than the hardness of the second connecting pipe 4332.

[0050] In the embodiment of the present application, the hardness of the first connecting pipe 4331 is greater than the hardness of the second connecting pipe 4332, so that the second connecting pipe 4332 can be deformed relative to the first connecting pipe 4331 based on its lower hardness, thereby absorbing the installation tolerance between the first connecting piece 431 and the second connecting piece 432.

[0051] Specifically, the hardness refers to the ability of the first connecting pipe 4331 and the second connecting pipe 4332 to resist local deformation (such as indentation, scratch, plastic deformation). The hardness of the second connecting pipe 4332 is relatively small, and it is more likely to be elastically or plastically deformed during assembly and use, so as to absorb the installation tolerance and buffer vibration impact. The hardness of the first connecting pipe 4331 is relatively large, and it plays a role of outer protection and limiting.

[0052] The first connecting tube 4331 can be made of nylon, polypropylene, or polybutylene terephthalate, etc., and the second connecting tube 4332 can be made of fluororubber or silicone rubber, etc. The first connecting tube 4331 and the second connecting tube 4332 can be processed by injection molding.

[0053] Optionally, such as Figure 9 and Figure 10 As shown, the second connecting pipe 4332 includes a first guide portion 43321, a second guide portion 43322, and a connecting portion 43323. The connecting portion 43323 passes through the crossbeam 200. Along the second direction Z, the first guide portion 43321 is connected to the end of the connecting portion 43323 near the first connector 431. The first connector 431 passes through the first guide portion 43321 and is inserted into the connecting portion 43323. The second guide portion 43322 is connected to the end of the connecting portion 43323 near the second connector 432. The second connector 432 passes through the second guide portion 43322 and is inserted into the connecting portion 43323.

[0054] In the embodiments of this application, the first guide portion 43321 guides the insertion of the first connector 431 into the connecting portion 43323, and the second guide portion 43322 guides the insertion of the second connector 432 into the connecting portion 43323. This reduces the alignment difficulty when the first connector 431 and the second connector 432 are inserted into the connecting portion 43323, and further improves the assembly efficiency between the first connector 431, the second connector 432 and the third connector 433.

[0055] Specifically, the first guide portion 43321 guides the first connector 431 as it is inserted into the connecting portion 43323. Specifically, the flow cross-sectional area of ​​the end of the first guide portion 43321 furthest from the connecting portion 43323 is larger than the flow cross-sectional area of ​​the end of the first guide portion 43321 closest to the connecting portion 43323. This is manifested in the following way: the flow cross-sectional area of ​​the end of the first guide portion 43321 closest to the connecting portion 43323 is smaller, while the end of the first guide portion 43321 furthest from the connecting portion 43323 is flared, resulting in a correspondingly larger flow cross-sectional area. The change in the flow cross-sectional area of ​​the first guide portion 43321 from the end furthest from the connecting portion 43323 to the end closest to the connecting portion 43323 can be a step-like change, a gradual change, or a segmented gradual change. By changing the cross-sectional area of ​​the flow, the first guide portion 43321 can form a flared structure, so that the first guide portion 43321 can guide the first connector 431 to be inserted into the connector portion 43323.

[0056] The flow cross-sectional area refers to the cross-sectional area through which the fluid (specifically the heat exchange medium) can actually pass within the pipe, and this cross-section must be perpendicular to the flow direction of the fluid.

[0057] The structure of the second guide section 43322 can be understood by referring to the structure of the first guide section 43321, and will not be repeated here.

[0058] Optionally, such as Figure 9 and Figure 10 As shown, along the second direction Z, from the end of the first guide portion 43321 away from the connecting portion 43323 to the end of the first guide portion 43321 close to the connecting portion 43323, the flow cross-sectional area of ​​the first guide portion 43321 gradually decreases.

[0059] In the embodiments of this application, from the end of the first guide portion 43321 away from the connecting portion 43323 to the end of the first guide portion 43321 near the connecting portion 43323, the flow cross-sectional area of ​​the first guide portion 43321 gradually decreases, which can form a smooth conical flared guide surface on the inner wall of the first guide portion 43321. When the first connector 431 is inserted into the connecting portion 43323, the first connector 431 can be aligned with the connecting portion 43323 with the help of the guide surface, further reducing the alignment difficulty when the first connector 431 is inserted into the connecting portion 43323 and improving the assembly efficiency of the first connector 431 and the connecting portion 43323.

[0060] Optionally, such as Figure 9 and Figure 10 As shown, along the second direction Z, from the end of the second guide portion 43322 away from the connecting portion 43323 to the end of the second guide portion 43322 near the connecting portion 43323, the flow cross-sectional area of ​​the second guide portion 43322 gradually decreases.

[0061] In the embodiments of this application, from the end of the second guide portion 43322 away from the connecting portion 43323 to the end of the second guide portion 43322 near the connecting portion 43323, the flow cross-sectional area of ​​the second guide portion 43322 gradually decreases, which can form a smooth conical flared guide surface on the inner wall of the second guide portion 43322. When the second connector 432 is inserted into the connecting portion 43323, the second connector 432 can be aligned with the connecting portion 43323 with the help of the guide surface, further reducing the alignment difficulty when the second connector 432 is inserted into the connecting portion 43323 and improving the assembly efficiency of the second connector 432 and the connecting portion 43323.

[0062] Optionally, such as Figure 9 and Figure 10As shown, along the second direction Z, from the end of the first guide portion 43321 away from the connecting portion 43323 to the end of the first guide portion 43321 near the connecting portion 43323, the flow cross-sectional area of ​​the first guide portion 43321 gradually decreases; along the second direction Z, from the end of the second guide portion 43322 away from the connecting portion 43323 to the end of the second guide portion 43322 near the connecting portion 43323, the flow cross-sectional area of ​​the second guide portion 43322 gradually decreases.

[0063] In the embodiments of this application, from the end of the first guide portion 43321 away from the connecting portion 43323 to the end of the first guide portion 43321 near the connecting portion 43323, the flow cross-sectional area of ​​the first guide portion 43321 is gradually reduced, so that the inner wall of the first guide portion 43321 can form a smooth conical flared guide surface; at the same time, from the end of the second guide portion 43322 away from the connecting portion 43323 to the end of the second guide portion 43322 near the connecting portion 43323, the flow cross-sectional area of ​​the second guide portion 43322 is gradually reduced, so that the inner wall of the second guide portion 43322 can form a smooth conical flared guide surface. When the first connector 431 is inserted into the connecting portion 43323, the first connector 431 can be aligned with the connecting portion 43323 by means of the guide surface of the first guide portion 43321, further reducing the alignment difficulty when the first connector 431 is inserted into the connecting portion 43323. When the second connector 432 is inserted into the connecting portion 43323, the second connector 432 can be aligned with the connecting portion 43323 by means of the guide surface of the second guide portion 43322, further reducing the alignment difficulty when the second connector 432 is inserted into the connecting portion 43323. Based on this, the assembly efficiency among the first connector 431, the second connector 432, and the third connector 433 is improved.

[0064] Optionally, such as Figure 10 As shown, the first connecting pipe 4331 has a first limiting part 43a, and the second connecting pipe 4332 has a second limiting part 43b. The first limiting part 43a and the second limiting part 43b are connected to limit the relative sliding of the first connecting pipe 4331 and the second connecting pipe 4332 along the second direction Z.

[0065] In the embodiments of this application, a first limiting part 43a is provided in the first connecting pipe 4331, and a second limiting part 43b is provided in the second connecting pipe 4332. The first limiting part 43a and the second limiting part 43b are connected to limit the relative sliding of the first connecting pipe 4331 and the second connecting pipe 4332 along the second direction Z. This reduces the risk of connection failure between the connecting part 43323 and the first guide part 43321 and the second guide part 43322 due to the relative sliding between the first connecting pipe 4331 and the second connecting pipe 43322, thereby improving the connection reliability and assembly applicability between the connecting part 43323 and the first guide part 43321 and the second guide part 43322.

[0066] Specifically, the first connecting pipe 4331 has a first limiting part 43a, and the second connecting pipe 4332 has a second limiting part 43b; one of the first limiting part 43a and the second limiting part 43b can be a boss, and the other is a groove, with the boss and the groove being limitedly connected; or, one of the first limiting part 43a and the second limiting part 43b can be a boss, and the other is a through hole, with the boss and the through hole being limitedly connected; or, one of the first limiting part 43a and the second limiting part 43b can be a buckle, and the other is a slot, with the buckle and the slot being limitedly connected; or, one of the first limiting part 43a and the second limiting part 43b can be a retaining ring, and the other is an annular shoulder, with the retaining ring and the annular shoulder being limitedly connected through surface contact.

[0067] Optionally, such as Figures 4-6 ,as well as Figure 9 and Figure 10 As shown, the second connector 432 has a third limiting protrusion 43c, which protrudes from the outer periphery of the end of the second connector 432 away from the second heat exchanger 420; the end of the third connector 433 near the second heat exchanger 420 abuts against the third limiting protrusion 43c.

[0068] In the embodiments of this application, a third limiting protrusion 43c is provided on the outer periphery of the end of the second connector 432 away from the second heat exchanger 420, and the third limiting protrusion 43c abuts against the end of the third connector 433 near the second heat exchanger 420, thereby limiting the insertion depth of the second connector 432 into the third connector 433, thereby improving the assembly consistency between the second connector 432 and the third connector 433.

[0069] Specifically, the third limiting protrusion 43c can be an annular protrusion, meaning it is arranged circumferentially around the outer wall of the second connector 432; alternatively, the third limiting protrusion 43c can be a partial protrusion, meaning there are multiple third limiting protrusions 43c, spaced apart along the circumferential direction of the outer wall of the second connector 432. During the process of inserting the second connector 432 into the third connector 433, the assembly personnel or assembly equipment can determine whether the third connector 433 is properly assembled by using the third limiting protrusion 43c.

[0070] Specifically, in the second direction Z, the third limiting protrusion 43c has an abutting platform on the side away from the second heat exchanger 420, and the end of the third connector 433 near the second heat exchanger 420 abuts against the abutting platform of the third limiting protrusion 43c.

[0071] In some embodiments, the first connector 431 has a fourth limiting protrusion, which protrudes from the outer periphery of the end of the first connector 431 away from the first heat exchanger 410, and the end of the third connector 433 near the first heat exchanger 410 abuts against the fourth limiting protrusion. The function of the fourth limiting protrusion can be similar to that of the third limiting protrusion 43c in its specific structure, and will not be described in detail here.

[0072] Furthermore, in the second direction Z, the orthographic projection of the third connector 433 on the second heat exchanger 420 covers the orthographic projection of the second connector 432 on the second heat exchanger 420, and the orthographic projection of the third connector 433 on the first heat exchanger 410 covers the orthographic projection of the first connector 431 on the first heat exchanger 410.

[0073] Optionally, such as Figure 2 , Figure 3 and Figure 11 As shown, the battery pack also has a first direction X and a third direction Y, with the third direction Y, the first direction X, and the second direction Z being perpendicular to each other. The crossbeam 200 includes a main body 210 and a plurality of partitions 220. The main body 210 is disposed within and connected to the housing 100, and the main body 210 and the housing 100 enclose a first receiving cavity 10a. The battery cell assembly 300 is arranged with the main body 210 along the first direction X. The main body 210 has a second receiving cavity 21a, and the plurality of partitions 220 are spaced apart along the third direction Y within the second receiving cavity 21a and connected to the main body 210 to divide the second receiving cavity 21a into a plurality of third receiving cavities 21b. A connector 430 passes through the third receiving cavity 21b. In some embodiments, at least one end of the third receiving cavity 21b along the second direction Z has an opening to facilitate the installation of the connector 430.

[0074] In the embodiments of this application, multiple partitions 220 are spaced apart along a third direction Y within the second receiving cavity 21a of the main body 210 and connected to the main body 210. Relying on the reinforcing structure formed by the partitions 220 and the main body 210, the bending stiffness and torsional stiffness of the main body 210 can be improved, thereby enhancing the support strength of the main body 210 for the battery cell assembly 300 and its ability to suppress the expansion tendency of the battery cell assembly 300 towards the crossbeam 200. Based on this, the multiple partitions 220 divide the second receiving cavity 21a into multiple independent third receiving cavities 21b. Connectors 430 pass through the third receiving cavities 21b. With the spatial limiting effect of the third receiving cavities 21b, not only is dedicated installation space provided for the connectors 430, enabling their orderly arrangement, but interference between multiple connectors 430 is also avoided, ensuring the stability of the connection structure.

[0075] Specifically, the crossbeam 200 includes a main body 210, which can be manufactured by processes such as die casting or extrusion. The main body 210 has a second receiving cavity 21a extending along a third direction Y. The crossbeam 200 also includes multiple partitions 220, which can be perpendicular to the third direction Y or at an angle to it. The multiple partitions 220 are spaced apart along the third direction Y. The shape of the partitions 220 can be plate-like or rib-like, etc. The cross-sectional shape of the partitions 220 perpendicular to the third direction Y matches the cross-sectional shape of the inner wall of the main body 210 perpendicular to the third direction Y. The partitions 220 are connected to the main body 210. Relative to the main body 210, the partitions 220 can be integral reinforcing rib partitions or detachable partition partitions, etc.

[0076] Multiple partitions 220 divide the second receiving cavity 21a into multiple third receiving cavities 21b. A portion of the third receiving cavities 21b is provided with a connector 430, while another portion of the third receiving cavities 21b is not provided with a connector 430. Each third receiving cavity 21b provided with a connector 430 is provided with a connector 430.

[0077] Furthermore, such as Figure 11 As shown, along the second direction Z, the main body 210 has a first opening on the side near the first heat exchanger 410, and a second opening on the side away from the first heat exchanger 410. The first connector 431 passes through the first opening and is located inside the main body 210, and the second connector 432 passes through the second opening and is located inside the main body 210.

[0078] Furthermore, such as Figure 11 As shown, the partition 220 has a platform section on the side near the first heat exchanger 410. The platform section is used to connect other components in the battery pack except for the cell assembly 300. The platform section can improve the integration of the battery pack.

[0079] Furthermore, such as Figure 15 As shown, the battery pack also includes an electrical component 500, which may include a battery management system (BMS) for monitoring and managing battery status, and fuses and relays for ensuring circuit safety. Along the first direction X, the electrical component 500 is connected to the end of the crossbeam 200 away from the cell assembly 300. Specifically, the electrical component 500 has a mounting portion connected to the platform portion of the partition 220.

[0080] Optionally, such as Figure 12 As shown, the battery pack also has a first direction X, the first direction X and the second direction Z are perpendicular to each other, the crossbeam 200 includes a main body 210 and a plurality of reinforcing parts 230; the main body 210 is disposed in the housing 100 and connected to the housing 100, the main body 210 and the housing 100 enclose a first receiving cavity 10a, the battery cell assembly 300 and the main body 210 are arranged along the first direction X; the main body 210 has a second receiving cavity 21a, the plurality of reinforcing parts 230 are spaced apart along the second direction Z in the second receiving cavity 21a and connected to the main body 210, and the connector 430 passes through the plurality of reinforcing parts 230.

[0081] In the embodiments of this application, multiple reinforcing portions 230 are spaced apart along the second direction Z within the second receiving cavity 21a of the main body 210 and connected to the main body 210. The reinforcing structure formed by the reinforcing portions 230 and the main body 210 enhances the bending and torsional stiffness of the main body 210, thereby strengthening the support of the main body 210 for the battery cell assembly 300 and suppressing the expansion tendency of the battery cell assembly 300 towards the crossbeam 200. Furthermore, connectors 430 pass through the multiple reinforcing portions 230. The spatial limiting effect of the reinforcing portions 230 prevents interference between the multiple connectors 430, ensuring the stability of the connection structure.

[0082] The structure of the reinforcing part 230 can be understood by referring to the structure of the partition part 220, and will not be described again here.

[0083] Furthermore, the main body 210 has a first opening on the side near the first heat exchanger 410, a second opening on the side away from the first heat exchanger 410, a third opening on the reinforcing part 230, a first connector 431 passing through the first opening and located inside the main body 210, a second connector 432 passing through the second opening and located inside the main body 210, and at least one of the first connector 431, the second connector 432, and the third connector 433 passing through the third opening.

[0084] For example, when a single battery cell expands, the expansion in the middle of the cell is more significant than that at the edges. If the main body 210 comes into contact with the expanded area of ​​the cell during the process of suppressing cell expansion, it may cause stress zoning within the cell, resulting in uneven stress distribution. In severe cases, this can lead to indentations on the cell surface, affecting the cell's lifespan and safety.

[0085] Based on this, such as Figure 13 and Figure 14 As shown, a single battery cell has a geometric center 30a. The distance between the main body 210 and the first heat exchanger 410 (specifically, along the second direction Z, the distance between the highest point of the main body 210 and the surface of the first heat exchanger 410 that is in contact with the battery cell assembly 300) is a first distance d1, and the distance between the geometric center 30a and the first heat exchanger 410 (specifically, along the second direction Z, the distance between the geometric center 30a and the surface of the first heat exchanger 410 that is in contact with the surface of the battery cell assembly 300) is a second distance d2, such that d1 is less than or equal to d2. In this way, when the main body 210 suppresses the expansion of the single battery cell, the main body 210 can abut against the edge of the single battery cell, preventing indentations from appearing on the surface of the single battery cell, thereby improving the service life and safety of the single battery cell.

[0086] Optionally, such as Figure 2 , Figure 7 and Figure 8 As shown, the battery pack also has a first direction X and a third direction Y. The third direction Y, the first direction X, and the second direction Z are perpendicular to each other. Multiple first heat exchangers 410 are provided, and the multiple first heat exchangers 410 are arranged at intervals along the third direction Y. Multiple connectors 430 are provided, and the multiple connectors 430 are all inserted through the crossbeam 200 and arranged at intervals along the third direction Y. Each connector 430 is connected to one first heat exchanger 410. The multiple connectors 430 are all connected to the second heat exchanger 420.

[0087] In the embodiments of this application, a plurality of first heat exchange components 410 are arranged at intervals along the third direction Y, and a plurality of connectors 430 are configured so that each connector 430 connects to a first heat exchange component 410, thereby achieving uniform coverage of the battery cell assembly 300 by the first heat exchange components 410, and thus improving the heat exchange efficiency and temperature control consistency of the heat exchange assembly 400.

[0088] Furthermore, a second heat exchanger 420 is provided, and the second heat exchanger 420 has multiple connection ports, which are arranged at intervals along the third direction Y, and each connector 430 is connected to one connection port.

[0089] In some embodiments, the first heat exchanger 410 is thermally connected to the electrode post of the single cell, and the second heat exchanger 420 is thermally connected to the side of the single cell away from the electrode post.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack having a second orientation (Z), characterized in that, include: Housing (100), crossbeam (200), battery cell assembly (300) and heat exchange assembly (400); The crossbeam (200) is disposed inside the housing (100) and connected to the housing (100). The crossbeam (200) and the housing (100) enclose a first receiving cavity (10a). The battery cell assembly (300) is disposed inside the first receiving cavity (10a). The heat exchange assembly (400) includes a first heat exchanger (410), a second heat exchanger (420), and a connector (430). Along the second direction (Z), the first heat exchanger (410) is disposed on one side of the battery cell assembly (300) and is heat-connected to the battery cell assembly (300), and the second heat exchanger (420) is disposed on the other side of the battery cell assembly (300) and is heat-connected to the battery cell assembly (300). The connector (430) passes through the crossbeam (200) along the second direction (Z), with one end of the connector (430) connected to the first heat exchanger (410) and the other end of the connector (430) connected to the second heat exchanger (420).

2. The battery pack according to claim 1, characterized in that, The connector (430) includes: a first connector (431), a second connector (432) and a third connector (433); The third connector (433) passes through the crossbeam (200) along the second direction (Z). One end of the first connector (431) is connected to the first heat exchanger (410), and the other end of the first connector (431) passes through the crossbeam (200) and is connected to the third connector (433). One end of the second connector (432) is connected to the second heat exchanger (420), and the other end of the second connector (432) passes through the crossbeam (200) and is connected to the third connector (433).

3. The battery pack according to claim 2, characterized in that, The battery pack also has a first direction (X), which is perpendicular to a second direction (Z), and the third connector (433) includes a deformable portion (4333) configured to deform at least along the first direction (X).

4. The battery pack according to claim 2, characterized in that, The third connector (433) includes: a first connecting pipe (4331) and a second connecting pipe (4332); Along the second direction (Z), the end of the first connector (431) away from the first heat exchanger (410) is inserted into one end of the second connecting pipe (4332), and the end of the second connector (432) away from the second heat exchanger (420) is inserted into the other end of the second connecting pipe (4332). The first connecting pipe (4331) is sleeved on the outer periphery of the second connecting pipe (4332).

5. The battery pack according to claim 4, characterized in that, The hardness of the first connecting tube (4331) is greater than that of the second connecting tube (4332).

6. The battery pack according to claim 4, characterized in that, The second connecting pipe (4332) includes: a first guide part (43321), a second guide part (43322), and a connecting part (43323), wherein the connecting part (43323) passes through the crossbeam (200). Along the second direction (Z), the first guide portion (43321) is connected to the end of the connecting portion (43323) near the first connector (431), the first connector (431) passes through the first guide portion (43321) and is inserted into the connecting portion (43323), the second guide portion (43322) is connected to the end of the connecting portion (43323) near the second connector (432), the second connector (432) passes through the second guide portion (43322) and is inserted into the connecting portion (43323).

7. The battery pack according to claim 6, characterized in that, Along the second direction (Z), from the end of the first guide portion (43321) away from the connecting portion (43323) to the end of the first guide portion (43321) close to the connecting portion (43323), the flow cross-sectional area of ​​the first guide portion (43321) gradually decreases; And / or, along the second direction (Z), from the end of the second guide portion (43322) away from the connecting portion (43323) to the end of the second guide portion (43322) near the connecting portion (43323), the flow cross-sectional area of ​​the second guide portion (43322) gradually decreases.

8. The battery pack according to claim 4, characterized in that, The first connecting tube (4331) has a first limiting part (43a), and the second connecting tube (4332) has a second limiting part (43b). The first limiting part (43a) and the second limiting part (43b) are connected to limit the relative sliding of the first connecting tube (4331) and the second connecting tube (4332) along the second direction (Z).

9. The battery pack according to claim 2, characterized in that, The second connector (432) has a third limiting protrusion (43c), which protrudes from the outer periphery of the end of the second connector (432) away from the second heat exchanger (420); The third connector (433) abuts against the third limiting protrusion (43c) at one end near the second heat exchanger (420); And / or, the first connector (431) has a fourth limiting protrusion, the fourth limiting protrusion being provided on the outer periphery of the end of the first connector (431) away from the first heat exchanger (410), and the end of the third connector (433) near the first heat exchanger (410) abutting against the fourth limiting protrusion.

10. The battery pack according to any one of claims 1-9, characterized in that, The battery pack also has a first direction (X) and a third direction (Y), wherein the third direction (Y), the first direction (X) and the second direction (Z) are perpendicular to each other, and the crossbeam (200) includes a main body (210) and a plurality of partitions (220). The main body (210) is disposed inside the housing (100) and connected to the housing (100). The main body (210) and the housing (100) enclose the first receiving cavity (10a). The battery cell assembly (300) and the main body (210) are arranged along the first direction (X). The main body (210) has a second receiving cavity (21a), and a plurality of the partitions (220) are spaced apart in the second receiving cavity (21a) along the third direction (Y) and connected to the main body (210) to divide the second receiving cavity (21a) into a plurality of third receiving cavities (21b), and the connector (430) passes through the third receiving cavity (21b).

11. The battery pack according to any one of claims 1-9, characterized in that, The battery pack also has a first direction (X), which is perpendicular to the second direction (Z), and the crossbeam (200) includes a main body (210) and a plurality of reinforcing parts (230). The main body (210) is disposed inside the housing (100) and connected to the housing (100). The main body (210) and the housing (100) enclose the first receiving cavity (10a). The battery cell assembly (300) and the main body (210) are arranged along the first direction (X). The main body (210) has a second receiving cavity (21a), and a plurality of the reinforcing parts (230) are spaced apart in the second receiving cavity (21a) along the second direction (Z) and connected to the main body (210). The connecting member (430) passes through the plurality of the reinforcing parts (230).

12. The battery pack according to any one of claims 1-9, characterized in that, The battery pack also has a first direction (X) and a third direction (Y), the third direction (Y), the first direction (X) and the second direction (Z) are perpendicular to each other, and a plurality of first heat exchangers (410) are provided, the plurality of first heat exchangers (410) are arranged at intervals along the third direction (Y); The connector (430) is provided in multiple ways. The multiple connectors (430) are all passed through the crossbeam (200) and arranged at intervals along the third direction (Y). Each connector (430) is connected to a first heat exchanger (410); the multiple connectors (430) are all connected to the second heat exchanger (420).

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