CN219350461U

CN219350461U - Battery pack

Info

Publication number: CN219350461U
Application number: CN202223249713.0U
Authority: CN
Inventors: 蔡华俭; 张波; 程志刚
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2022-12-01
Filing date: 2022-12-01
Publication date: 2023-07-14
Anticipated expiration: 2032-12-01

Abstract

The utility model relates to the technical field of batteries and discloses a battery pack which comprises a box body and at least one battery cell unit arranged in the box body, wherein the battery cell unit comprises a plurality of battery cells which are sequentially stacked along the thickness direction, a connecting plate is arranged on at least one side of the battery cell unit along the length direction, an adhesive layer is arranged between the connecting plate and the battery cell unit, and the battery cells are all connected with the connecting plate through the adhesive layer. Meanwhile, the weight of the adhesive layer is N g, the weight of the battery cell unit is M kg, and the following relation is satisfied: N/M is more than or equal to 0.2 and less than or equal to 5; one side of the battery unit along the thickness direction is a first side, one side of the battery unit along the length direction is a second side, and the area of the first side is smaller than that of the second side. Under the same condition of electric core unit weight, the battery package that this embodiment provided bonds a plurality of first faces through connecting plate, glue film, realizes the bonding of electric core unit and fixes, and with glue volume little, is favorable to subtracting heavy and reduce cost to make the whole energy density of battery package higher.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

Generally, a battery Pack equipped on an electric vehicle is assembled into a Module (Module) from battery cells, and then the Module is mounted in the battery Pack (Pack) to form a three-stage assembly mode of battery cell-Module-battery Pack; the assembly is convenient and the strength is high. However, when the module is assembled, the energy density is reduced due to excessive structural members, and the cost is increased.

Along with the increasing requirement of the electric automobile on the light weight, the CTP technology is widely applied To the requirements of energy density and grouping efficiency of the battery Pack, and the CTP technology (Cell To Pack; battery-battery Pack) is To directly integrate battery monomers into the battery Pack, so that a middle module architecture is omitted, the structure of the PACK is simplified, and the space utilization rate is improved.

In the existing CTP technology, a plurality of battery cells are assembled into a battery cell unit firstly and then packaged in a box body, and the battery cell unit is assembled by bonding all battery cells directly through glue, so that the problem of excessive glue consumption exists, the assembly process is complicated, and the assembly difficulty is high; in addition, the mounting strength of the battery cell unit formed by directly bonding through glue is low, and the overall safety performance of the battery pack is affected.

Disclosure of Invention

The utility model aims to provide a battery pack which reduces the glue coating amount, realizes weight and cost reduction, improves the energy density, and is simple to assemble and high in strength.

In order to achieve the above object, the present utility model provides a battery pack comprising: the battery cell comprises a box body and at least one battery cell unit arranged in the box body; the battery cell unit comprises a plurality of battery cells which are sequentially stacked along a first direction; a kind of electronic device with high-pressure air-conditioning system

A connection assembly including a connection plate;

the connecting plate is arranged on at least one side of the battery cell unit along the second direction, a glue layer is arranged between the connecting plate and the battery cell, and a plurality of battery cells are connected with the connecting plate through the glue layer; the weight of the adhesive layer is N g, the weight of the battery cell unit is M kg, and the following relation is satisfied: N/M is more than or equal to 0.2 and less than or equal to 5;

the first direction is the thickness direction of the battery cell, and the second direction is the length direction of the battery cell.

Preferably, the thickness of the connecting plate along the second direction is T mm, and the mass of the battery cell is G kg;

the following relationship is satisfied: T/G is more than or equal to 0.2 and less than or equal to 5.

Preferably, the number of the battery cells is a plurality, the connecting plates comprise a first connecting plate and a second connecting plate, and the plurality of the battery cells are arranged side by side along the second direction; the second connecting plates are arranged between every two adjacent electric core units and are connected with the two adjacent electric core units through the adhesive layers; the plurality of battery cell units are arranged side by side, and then are connected with the first connecting plate through the adhesive layer along the two sides of the second direction.

Preferably, the connecting plate is provided with a first positioning part, and the first positioning part is arranged at one side of the connecting plate along the third direction.

Preferably, the connection plate is an integral structure crossing each battery cell in the battery cell unit in the first direction; or (b)

The connecting plate is of a split type structure, the connecting plate comprises a plurality of plate bodies which are arranged at intervals along the first direction, the glue layers are arranged between the plate bodies and the battery cells, and the plate bodies are connected with the two battery cells which are arranged adjacently along the first direction through the glue layers.

Preferably, the connection assembly further comprises:

the at least two barrier strips are arranged on one side, facing the battery cell unit, of the connecting plate, the at least two barrier strips are arranged at intervals and enclose into a glue storage space, and the glue layer is positioned in the glue storage space.

Preferably, each barrier strip is arranged adjacent to each edge of the connecting plate, and the distance between the barrier strip and the adjacent edge of the connecting plate is 0-35mm;

preferably, the cell unit further comprises:

the end plate is arranged at least one end of the battery cell unit along the first direction;

and the elastic piece is connected between the battery cell unit and the end plate.

Preferably, the box body comprises a bottom plate, a frame and an upper cover:

the bottom plate, the frame and the upper cover are sequentially arranged along a third direction and jointly enclose into a containing cavity, and the battery cell unit is packaged in the containing cavity, wherein the third direction is the height direction of the battery cell;

the second positioning part is arranged on one side of the frame, which is close to the upper cover.

Preferably, the number of the battery cells is a plurality, and the plurality of battery cells are arranged side by side along the second direction; the battery pack further includes:

the isolating piece is arranged between the battery cell assembly and the bottom plate, and along a third direction, the projections of two adjacent battery cell units and the isolating piece are at least partially overlapped.

Compared with the prior art, the utility model provides a battery pack, which has the beneficial effects that:

the utility model arranges a plurality of battery monomers along the thickness direction to form a battery core unit;

the battery pack provided by the utility model comprises a box body and at least one battery cell unit arranged in the box body; the battery cell unit comprises at least one battery cell unit, the battery cell unit comprises a plurality of battery cells which are sequentially stacked along the thickness direction, the connecting plate is arranged on at least one side of the battery cell unit along the length direction, a glue layer is arranged between the connecting plate and the battery cell unit, and the battery cells are all connected with the connecting plate through the glue layer. Compared with the method that each battery monomer of the CTP battery pack is directly bonded through glue, the method and the device utilize the connecting plate to be bonded with the glue layer in a matched mode, can reduce the glue consumption for bonding the battery monomer in the battery pack, and improve the assembly strength; in addition, the structure can be used for firstly forming the battery cell unit by each battery cell and then integrally installing the battery cell unit into the box body, so that the assembly process is simplified, and the assembly difficulty is reduced.

Meanwhile, it should be noted that the opposite sides of the battery cell along the length direction are first sides, the opposite sides of the battery cell along the thickness direction are second sides, and the area of the first sides is smaller than that of the second sides. According to the embodiment, each connecting plate extends along the thickness direction of each battery cell, each connecting plate covers the first face of each battery cell, and through setting up the glue layer between the connecting plate and the battery cell unit, the bonding fixation of the battery cell and the connecting plate is realized, and then the contact area of the battery cell and the connecting plate is reduced, and the glue consumption is reduced.

Under the same condition of battery monomer weight, the battery package that this embodiment provided bonds a plurality of first faces through connecting plate, glue film, and the area of first face is obviously less than the second face, and the corresponding volume of using glue of unit weight's battery monomer promptly is less, is favorable to subtracting heavy and reduce cost for the weight ratio of electric core unit and glue film is in the preferred scope, thereby makes the whole energy density of battery package higher.

Drawings

Fig. 1 is a schematic diagram of a connection structure between a battery cell unit and a connection board according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of an arrangement structure of a battery cell according to an embodiment of the present utility model;

fig. 3 is an exploded view of a battery pack according to an embodiment of the present utility model;

FIG. 4 is a schematic structural view of a frame according to an embodiment of the present utility model;

FIG. 5 is an enlarged view of portion A of FIG. 4;

fig. 6 is a schematic diagram of a connection structure between a battery cell unit and a spacer provided in an embodiment of the present utility model;

fig. 7 is a schematic diagram of a connection structure between a battery cell unit and a frame according to an embodiment of the present utility model;

fig. 8 is an enlarged view of a portion B in fig. 7.

In the figure: 100. a battery pack;

11. a cell unit; 111. a battery cell; 112. a gap;

2. a connection assembly; 21. a connecting plate; 211. a first connection plate; 212. a second connecting plate;

22. a first positioning portion; 23. a plate body; 24. a glue layer;

3. a barrier strip; 31. an adhesive tape; 32. a convex strip; 33. a glue storage space;

41. an elastic member; 42. an end plate; 421. grid grooves;

5. a case; 51. a bottom plate; 52. a frame; 521. a frame; 5211. an accommodating space; 522. a cross beam; 523. a unit space; 53. a receiving chamber;

54. a second positioning portion; 55. an upper cover; 561. a first seal ring; 562. a second seal ring;

6. a spacer; 7. BMS assembly; 8. CCS assembly.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application.

It should be understood that in the description of the present application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, i.e., features defining "first," "second," may explicitly or implicitly include one or more such features. Furthermore, unless otherwise indicated, the meaning of "a plurality" is two or more.

It should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The embodiment of the utility model provides a battery pack 100, which comprises a box body 5 and at least one battery cell unit 11 arranged in the box body 5, wherein the battery cell unit 11 comprises a plurality of battery cells 111 which are sequentially stacked along a first direction; the battery pack 100 further comprises a connecting assembly 2, the connecting assembly 2 comprises a connecting plate 21, the connecting plate 21 is arranged on at least one side of the battery cell 11 along the second direction, a glue layer 24 is arranged between the connecting plate 21 and the battery cell 11, and the battery cells 111 are connected with the connecting plate 21 through the glue layer 24. The first direction is a thickness direction of the battery cell 111, and the second direction is a length direction of the battery cell 111.

Meanwhile, the weight of the adhesive layer 24 is defined as N (g), and the weight of the battery cell unit 11 is defined as M (kg), satisfying the following relation: N/M is more than or equal to 0.2 and less than or equal to 5. Wherein, the value of the relation is related to the positive and negative electrode materials of the battery cell 111, the material of the adhesive layer 24, etc., when the value of the relation tends to be 0.2, the greater the overall energy density of the battery pack 100 is, the smaller the mounting strength of the battery cell 11 is, and when the value of the relation tends to be 5, the lesser the overall energy density of the battery pack 100 is, the greater the mounting strength of the battery cell 11 is; in this embodiment, it is preferable that: N/M is 0.5.ltoreq.N/M.ltoreq.3, so that the mounting strength of the battery cell 11 and the energy density of the battery pack 100 can be simultaneously considered.

The battery pack 100 provided in this embodiment includes at least one battery cell unit 11, the battery cell unit 11 includes a plurality of battery cells 111 stacked in sequence along a thickness direction, the connection board 21 is disposed on at least one side of the battery cell unit 11 along a length direction, a glue layer 24 is disposed between the connection board 21 and the battery cell unit 11, and the plurality of battery cells 111 are all connected with the connection board 21 through the glue layer 24.

The length direction of the battery cell 111 is larger than the dimension in the thickness direction, the opposite sides of the battery cell 111 in the length direction are first sides, the opposite sides of the battery cell 111 in the thickness direction are second sides, and the area of the first sides is smaller than the area of the second sides. Each connecting plate 21 provided in this embodiment extends along the thickness direction of the battery cell 111, each connecting plate 21 covers a plurality of first surfaces, and by disposing the adhesive layer 24 between the connecting plate 21 and the battery cell 11, the adhesion fixation of the battery cell 111 and the connecting plate 21 is realized, that is, the contact area between each battery cell 111 and the connecting plate 21 is smaller.

Under the condition that the weights of the battery cells 111 are the same, the battery pack 100 provided in this embodiment adheres to the plurality of first surfaces through the connecting plate 21 and the adhesive layer 24, and the area of the first surface is obviously smaller than that of the second surface, compared with the scheme that the battery cells 111 are stacked along the length direction and the connecting plate covers the plurality of second surfaces, the adhesive consumption of each battery cell 111 in this embodiment is small, that is, the weight relationship between the full adhesive layer 24 and the battery cell 11 satisfies 0.2N/M5, so that the overall energy density of the battery pack 100 is higher.

The connecting plate 21 in this embodiment is preferably made of plastic material, which has high strength and light weight, and can provide mounting support for each of the battery cells 11 without greatly affecting the overall energy density of the battery pack 100.

Specifically, when the number of the battery cells 11 is one, the connecting plate 21 includes a first connecting plate 211, the first connecting plate 211 is disposed on at least one side of the battery cells 11 along the second direction, preferably, the first connecting plate 211 has two sides disposed on two sides of the battery cells 11 along the second direction, the first connecting plate 211 extends along the first direction, and an adhesive layer 24 is disposed between the first connecting plate 211 and the battery cells 11, and the plurality of battery cells 111 are all connected with the connecting plate 21 through the adhesive layer 24, that is, the sides of the first connecting plate 211 adjacent to the battery cells 111 are bonded.

When the number of the battery cells 11 is plural, the connection plate 21 includes a first connection plate 211 and a second connection plate 212, and the plural battery cells 11 are arranged side by side in the second direction; the second connection board 212 is disposed between two adjacent battery cell units 11, and the second connection board 212 is connected with two adjacent battery cell units 11 through the adhesive layer 24, that is, two adjacent battery cell units 11 share one second connection board 212; the plurality of battery cells 11 are arranged side by side, and then are connected with the first connecting plate 211 through the adhesive layer 24 on two sides along the second direction. Therefore, the connecting plates 21 are coated with adhesive layers on one side or two sides to bond the plurality of battery cell units 11, the assembled plurality of battery cell units 11 form a whole, then the whole battery cell units can be installed into the box body 5 of the battery pack, the assembly is simple, and the plurality of connecting plates 21 penetrate between the battery cell units 11 to provide a supporting effect for the battery cell units 11, so that the whole installation strength of the battery cell units 11 is improved.

In view of this, this embodiment provides a battery pack 100 with high grouping efficiency and less glue consumption, a plurality of battery cells 111 are firstly arranged along a first direction to form battery cells 11, then a plurality of battery cells 11 are sequentially arranged along a second direction, connecting plates 21 are respectively arranged on two sides along the second direction and between two adjacent battery cells 11, glue layers are respectively arranged on the surfaces of the connecting plates 21 opposite to each battery cell 11, and the glue layers are coated on one side or two sides of the connecting plates 21, so that the adhesion and fixation between the battery cells 111 and between the battery cells 11 are realized, the glue consumption is reduced, the weight and cost are reduced, the energy density is improved, and the assembly process is simple; meanwhile, the connecting plate 21 is made of plastic material, and can be used for insulating protection and enhancing the mounting strength of the battery cell unit 11.

Preferably, the thickness of the connection plate 21 in the second direction is defined as T mm, and the mass of the battery cell 111 is G kg; t, G in this embodiment satisfies the following relation: T/G is more than or equal to 0.2 and less than or equal to 5; thus, the strength requirement of the entire battery cell 11 can be satisfied, and the size of the connection plate 21 can be reduced as much as possible, thereby reducing the dead weight of the battery pack 100. Optionally, the thickness T mm of the connection plate 21 along the second direction is 0.2-5mm, wherein the specific value of T mm is determined according to the requirements of the specific material and the installation strength of the connection plate 21, and when the value of T mm tends to be 5mm, the installation strength of the battery cell 11 is higher, and when the value of T mm tends to be 0.2mm, the installation strength of the battery cell 11 is lower; tmm is preferably 0.3 to 3.5mm in this embodiment; the Tmm in this embodiment is further preferably 0.3 to 1.5mm.

Preferably, as shown in fig. 1 and 2, the connecting plate 21 is provided with a first positioning portion 22, and the first positioning portion 22 is provided on an outer side surface of the connecting plate 21, wherein the first positioning portion 22 is located at an edge position (an upper end in the third direction) of the outer side surface of the connecting plate 21, which is close to the top surface of the battery cell 111. On the one hand, in the bonding process of the connecting plate 21 and the battery cell 11, the first positioning part 22 helps to align and bond the connecting plate 21 and the battery cell 11; on the other hand, in the assembly process of the battery cell unit 11 and the box 5, the first positioning part 22 helps to clamp the fixture for positioning, so that the battery cell unit 11 and the box 5 are accurately installed. Further preferably, in this embodiment, the first connecting plate 211 and the second connecting plate 212 are both provided with a first positioning portion 22, and the first positioning portion 22 is a first positioning hole; in the present embodiment, two first positioning holes are provided at both ends of the connection plate 21 in the first direction. Specifically, the clamping tool is provided with a positioning pin, the positioning pin is matched with the first positioning hole, and when the battery cell unit 11 and the connecting plate 21 are assembled, the battery cell unit 11 is positioned and mounted to the box 5 through the first connecting plate 211 at the outermost side of the clamping tool, so that the mounting efficiency and the mounting accuracy can be improved.

The connection plate 21 spans the integral structure of each battery cell 111 in the battery cell 11 in the first direction, or is a split structure.

As shown in fig. 1 and 2, in an embodiment, the connection plate 21 is in an integrated structure, the connection plate 21 extends along the first direction, and the single connection plate 21 covers all the battery cells 111 on the single battery cell 11, so that the single connection plate 21 can effectively improve the structural strength of the battery cell 11.

As shown in fig. 7, in another embodiment, the connecting plate 21 is of a split structure, the connecting plate 21 includes a plurality of plate bodies 23 arranged at intervals along the first direction, an adhesive layer 24 is disposed between each plate body 23 and each battery cell 111, and each plate body 23 is sequentially connected with two battery cells 111 arranged adjacently along the first direction through the adhesive layer 24, so that the weight of the connecting plate 21 can be further reduced, and the cost and weight can be reduced. Of course, in this embodiment, the first positioning portion 22 may be provided on the plate body 23 at the end in the first direction.

Wherein, the connecting plate 21 can be made of plastic or metal. The dead weight of the battery pack 100 can be effectively reduced by adopting plastic materials; by adopting the metal material, the strength of the battery cell unit 11 can be enhanced, and the heating or cooling can be performed by adopting a side heat conduction mode. In this embodiment, the connection plate 21 is preferably made of plastic.

Preferably, as shown in fig. 1 and 2, in this embodiment, the connecting assembly 2 further includes two barrier strips 3 disposed on a side of the connecting plate 21 facing the battery cell unit 11, at least two barrier strips 3 are disposed at intervals in a third direction and enclose a glue storage space 33, and the glue layer 24 is located in the glue storage space 33, so as to prevent the glue layer 24 from overflowing to affect the assembly and the flatness of the battery cell unit 11. It is further preferred that each barrier strip 3 is arranged adjacent to each edge of the connection plate 21, and that the distance between the barrier strip 3 and the edge of the adjacent connection plate 21 is 0-35mm, preferably 2-25mm, further preferably 5-15mm, to leave sufficient space to accommodate the glue layer 24. Of course, the barrier strips 3 may be four, two of which are arranged at intervals along the third direction, and the other two of which are arranged at intervals along the first direction and are respectively adjacent to the edges of the connecting plate 21, so that the glue layer 24 is limited in four directions, and the limiting effect on the glue layer 24 is better.

In other embodiments, when the connecting plate 21 is in a split structure, each plate body 23 should be provided with a corresponding barrier strip 3, where the number of barrier strips 3 is determined according to the number of plate bodies 23, which will not be described in detail herein.

In this embodiment, as shown in fig. 1 and 2, the barrier strip 3 is a rubber strip 31 adhered to the connecting plate 21, and a rubber strip 31 is disposed on a side wall of the connecting plate 21 provided with the rubber layer 24, that is, the rubber strip 31 is adhered and fixed to the connecting plate 21. The adhesive tape 31 is made of elastic medium or rigid medium, and preferably, the adhesive tape 31 is made of plastic material.

In other embodiments, the barrier strip 3 is integrally formed with the connecting plate 21.

As shown in fig. 7, the connecting plate 21 is of a split structure, each plate 23 is uniformly formed with a raised line 32, raised lines 32 are respectively provided at four side edges of the plate 23, and a glue storage space 33 of a groove structure is defined between the four raised lines 32 and the plate 23, so as to prevent the glue layer 24 from overflowing.

In some preferred embodiments, a gap 112 is provided between two adjacent battery cells 111 in the first direction or a filler layer is provided between two adjacent battery cells 111 in the first direction. The filling layer is a rigid medium and/or an elastic medium. Specifically, the battery cells 111 are stacked in a column along the first direction (thickness direction), and a rigid medium of a loop frame structure may be filled between two adjacent battery cells 111 along the first direction to reserve a gap 112, or an elastic aerogel or other material may be filled.

In some preferred embodiments, as shown in fig. 2, 3, 6, and 7, the cell unit 11 further includes: the elastic member 41 and the end plate 42, the end plate 42 is provided at least one end of the battery cell 11 in the first direction, and the elastic member 41 is connected between the battery cell 11 and the end plate 42. The elastic member 41 can absorb dimensional tolerances of the battery cell 11. In addition, the side of the end plate 42 remote from the elastic member 41 is provided with a grid groove 421, thereby providing a clamping jaw space for the clamping fixture when the cell unit 11 is assembled into the case 5.

Preferably, as shown in fig. 3, in this embodiment, the case 5 includes a bottom plate 51, a frame 52 and an upper cover 55, where the bottom plate 51, the frame 52 and the upper cover 55 are sequentially arranged along a third direction and jointly enclose a housing cavity 53, and the battery cell unit 11 is encapsulated in the housing cavity 53, and the third direction is a height direction of the battery cell 111.

The frame 52 is mounted on the base plate 51 by bolts, FDS or welding, and the cell unit 11 is adhered to the base plate 51 by an adhesive (a structural adhesive or a heat-conductive structural adhesive) and is accommodated in the accommodating cavity 53. The adhesive has heat conducting property, and is used for conducting heat of the battery cell 11 to the bottom plate 51, so that heat of the battery cell 11 is dissipated, and the battery cell 11 still has good heat dissipation performance in a closed environment. It should be noted that the case 5 may use a separate cooling plate or a bottom plate 51 to integrate the cooling system.

In an embodiment, as shown in fig. 3 and 4, the frame 52 includes a frame 521 and a beam 522, the frame 521 encloses a receiving space 5211, and the beam 522 is disposed in the receiving space 5211 and has two ends respectively connected to the frame 521 to divide the receiving space 5211 into two unit spaces 523; a plurality of battery cell units 11 are correspondingly arranged in each unit space 523; by providing the cross member 522, the housing chamber 53 can be partitioned into a plurality of unit spaces 523 to house a plurality of battery cells 11, and structural strength of the case 5 can be enhanced. The number of the cross beams 522 may be selected according to actual needs.

Preferably, as shown in fig. 4, 5, 7 and 8, the frame 52 further includes a second positioning portion, and the second positioning portion is disposed on a side of the frame 52 close to the upper cover 55, so as to facilitate positioning and alignment of the clamping fixture, facilitate assembly of the battery cell 11 into the case 5, and ensure dimensional accuracy. In this embodiment, the second positioning portion 54 is a second positioning hole.

Specifically, generally, a first positioning pin and a second positioning pin are provided on the clamping tool, and when the battery pack 100 is assembled, the clamping tool is matched with the first positioning hole in a positioning manner through the first positioning pin so as to align and clamp the battery cell unit 11, and the battery cell unit 11 is transported and assembled into the unit space 523; during the assembly process, the second positioning pin is matched with the second positioning hole in a positioning manner so as to ensure the dimensional accuracy of the assembly of the battery cell 11 and the cell space 523.

Preferably, as shown in fig. 6, the number of the battery cells 11 is plural, the plurality of battery cells 11 are arranged side by side along the second direction, the separator 6 is arranged between the battery cells 11 and the bottom plate 51, and the projections of the adjacent two battery cells 11 and the separator 6 at least partially coincide along the third direction, that is, the separator 6 separates the bottoms of the adjacent two battery cells 11; the spacer 6 serves to limit glue between the battery cells 111 and the bottom plate 51 from overflowing and to enhance the bottom insulation effect of the battery cell 11.

Further preferably, the spacer 6 is a split structure, and the spacer 6 includes a plurality of spacer bars arranged at intervals along the second direction; the number of the isolating strips is the same as that of the connecting plates, each isolating strip is arranged between the connecting plate 21 and the bottom plate 51 in a one-to-one correspondence manner so as to isolate the bottoms of the battery cells 11, and a gap for accommodating adhesive is reserved between two adjacent isolating strips; namely, a spacer is connected between each two adjacent battery cells 11, and the thickness of the spacer is 0.1-4mm, preferably 0.2-2.5mm, and more preferably 0.2-0.9mm, so as to avoid the undesirable heat dissipation effect caused by the overlarge heat transfer distance between the battery cells 111 and the bottom plate 51.

Further, as shown in fig. 3, the case 5 further includes a sealing assembly including a first sealing ring 561 and a second sealing ring 562, the first sealing ring 561 is disposed between the upper cover 55 and the frame 52, and the second sealing ring 562 is disposed between the frame 52 and the bottom plate 51.

Preferably, the battery pack 100 provided in this embodiment further includes a BMS assembly (battery management system) 7 and a CCS assembly (integrated busbar) 8, and as shown in fig. 3, the BMS assembly 7 and the CCS assembly 8 are disposed in the case 5. The battery pack 100 provided in this embodiment integrates the BMS assembly 7 and the CCS assembly 8, and has the advantages of small volume, good sealing performance and easy assembly.

In addition, it should be noted that the space between the end plate 42 and the frame 521, the space between the connecting plate 21 and the frame 521, and the cross beam 522 may be filled with or not filled with a potting adhesive, which is not particularly limited herein.

The heat insulation materials are adhered to the two sides of the battery cell unit 11 along the first direction, so that the heat insulation performance is improved, and the overall performance of the battery pack is improved.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims

1. A battery pack, comprising: the battery pack comprises a box body (5) and at least one battery cell unit (11) arranged in the box body (5), wherein the battery cell unit (11) comprises a plurality of battery cells (111) which are sequentially stacked along a first direction; a kind of electronic device with high-pressure air-conditioning system

-a connection assembly (2), the connection assembly (2) comprising a connection plate (21);

the connecting plate (21) is arranged on at least one side of the battery cell unit (11) along the second direction, a glue layer (24) is arranged between the connecting plate (21) and the battery cell unit (11), and a plurality of battery cells (111) are connected with the connecting plate (21) through the glue layer (24); the weight of the adhesive layer (24) is N g, the weight of the battery cell unit (11) is M kg, and the following relation is satisfied: N/M is more than or equal to 0.2 and less than or equal to 5;

the first direction is the thickness direction of the battery cell (111), and the second direction is the length direction of the battery cell (111).

2. The battery pack according to claim 1, wherein the thickness of the connection plate (21) in the second direction is T mm, and the mass of the battery cell (111) is G kg;

3. The battery pack according to claim 1, wherein the number of the battery cells (11) is plural, the connection plate (21) includes a first connection plate (211) and a second connection plate (212), and the plural battery cells (11) are arranged side by side in the second direction; the second connecting plates (212) are arranged between two adjacent electric core units (11), and the second connecting plates (212) are connected with the two adjacent electric core units (11) through the adhesive layers (24); the plurality of battery cell units (11) are connected with the first connecting plate (211) through the adhesive layer (24) at two sides of the second direction after being arranged side by side.

4. The battery pack according to claim 1, wherein the connection plate (21) is provided with a first positioning portion (22), and the first positioning portion (22) is provided on one side of the connection plate (21) in a third direction, wherein the third direction is a height direction of the battery cell (111).

5. The battery pack according to claim 1, wherein the connection plate (21) is an integral structure that spans each battery cell (111) in the battery cell unit (11) in the first direction; or alternatively, the first and second heat exchangers may be,

the connecting plate (21) is of a split type structure, the connecting plate (21) comprises a plurality of plate bodies (23) which are arranged at intervals along the first direction, an adhesive layer (24) is arranged between each plate body (23) and each battery cell (111), and the two battery cells (111) which are adjacently arranged along the first direction are connected through the adhesive layer (24) by each plate body (23).

6. The battery pack according to claim 1, wherein the connection assembly (2) further comprises:

the at least two baffle strips (3) are arranged on one side of the connecting plate (21) facing the battery cell unit (11), the at least two baffle strips (3) are arranged at intervals and enclose a glue storage space (33), and the glue layer (24) is positioned in the glue storage space (33).

7. The battery pack according to claim 6, wherein each of the barrier ribs (3) is provided adjacent to each edge of the connection plate (21), and a distance between the barrier rib (3) and the adjacent edge of the connection plate (21) is 0-35mm.

8. The battery pack according to claim 1, wherein the cell unit (11) further comprises:

an end plate (42) provided at least one end of the battery cell unit (11) in the first direction;

and an elastic member (41) connected between the cell unit (11) and the end plate.

9. The battery pack according to claim 1, wherein the case (5) includes a bottom plate (51), a frame (52), and an upper cover (55);

the bottom plate (51), the frame (52) and the upper cover (55) are sequentially arranged along a third direction and jointly enclose to form a containing cavity (53), and the battery cell unit (11) is packaged in the containing cavity (53), wherein the third direction is the height direction of the battery cell (111);

and a second positioning part which is arranged on one side of the frame (52) close to the upper cover (55).

10. The battery pack according to claim 9, wherein the number of the battery cells (11) is plural, and a plurality of the battery cells (11) are arranged side by side in the second direction; the battery pack further includes:

the isolating pieces (6) are arranged between the battery cell units (11) and the bottom plate (51), and along a third direction, the space enclosed between two adjacent battery cell units (11) is at least partially overlapped with the projection of the isolating pieces (6).