Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle, and belongs to the technical field of batteries. The battery pack comprises a plurality of battery columns and at least one connecting assembly, the plurality of battery columns are distributed at intervals in the first direction, a gap is formed between every two adjacent battery columns, and the connecting assembly is arranged in the first gap; the battery column comprises a plurality of battery monomers, the plurality of battery monomers are distributed along a second direction, the connecting assembly comprises a connecting piece and a bonding piece, the bonding piece is arranged between the connecting assembly and the battery monomers and is connected with the connecting assembly and the battery monomers, and the connecting piece is provided with a through hole; the through hole penetrates through the connecting piece in the first direction. The bonding piece covers the through hole, or the through hole penetrates through the bonding piece; the first direction intersects the second direction.

Description

Technical Field

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

[0002] With the development of science and technology, electric vehicles are being used more and more widely. Usually, electric vehicles are equipped with battery packs, which provide power to the vehicle so that the vehicle can travel. In the related art, before installing the battery pack in the vehicle, the battery pack must be assembled first. However, the existing battery packs have low energy density and structural strength after assembly, which cannot meet the increasingly stringent safety requirements of electric vehicles. However, in the related art, the efficiency of assembling the battery pack is low. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a battery pack and a vehicle that can solve the problems of low volume utilization and low structural strength of the assembled battery pack.

[0004] In a first aspect, an embodiment of the present application provides a battery pack, the battery pack comprising: a plurality of battery columns and at least one connection assembly;

[0005] The plurality of battery columns are spaced apart along a first direction, and there is a gap between two adjacent battery columns along the first direction, and at least one connecting component is disposed in the gap;

[0006] The battery column includes a plurality of battery cells, and the plurality of battery cells are distributed along the second direction. The connecting assembly includes a connecting member and an adhesive member, and the adhesive member is arranged between the connecting member and the battery cells and connects the connecting member and the battery cells. The connecting member is provided with a through hole; the through hole penetrates the connecting member along the first direction; the adhesive member covers the through hole, or the through hole penetrates the adhesive member; and the first direction intersects with the second direction.

[0007] Optionally, the connecting component further includes a glue limiting component, which is arranged on the side of the connecting component close to the battery cell and defines a glue containing space with the connecting component, and the adhesive component is arranged in the glue containing space; the glue limiting component and the through hole are spaced apart along a third direction, and the first direction, the second direction and the third direction intersect each other.

[0008] Optionally, the average size of the battery cells is D1 mm, and the average size of the connecting components is D2 mm, satisfying: 0<D2 / D1≤0.1. Preferably, the battery pack satisfies: 0.015<D2 / D1≤0.038.

[0009] Optionally, the battery pack satisfies: 120≤D1≤300, and / or, 1≤D2≤10.

[0010] Optionally, along the second direction, the average size of the battery cells is D3 mm, and along the third direction, the average size of the battery cells is D4 mm, satisfying: D3<D4, and D4<D1, and the first direction, the second direction and the third direction are perpendicular to each other.

[0011] Optionally, the connecting member has a first surface and a second surface relative to each other along the first direction, and the adhesive member includes multiple first adhesive layers and multiple second adhesive layers, the multiple first adhesive layers are arranged at intervals on the first surface, and the multiple second adhesive layers are arranged at intervals on the second surface, and the first adhesive layers and the second adhesive layers are respectively connected to the battery columns on both sides of the connecting member along the first direction.

[0012] Optionally, the connecting member comprises a connecting plate and a functional layer, the functional layer is arranged on at least one side of the connecting plate along the first direction, and the adhesive is arranged on a side of the functional layer away from the connecting plate; the thermal conductivity of the functional layer is τW / (m·K), and τ satisfies: 0<τ≤1, and / or the volume resistivity of the functional layer is PΩ·m, which satisfies 10 6 ≤P≤10 19 .

[0013] Optionally, the adhesive member includes a plurality of adhesive portions, the plurality of adhesive portions are arranged at intervals along the second direction, and along the first direction on a plane perpendicular to the first direction, a projection of one of the battery cells covers a projection of at least one of the adhesive portions.

[0014] Optionally, there are multiple through holes distributed on the connecting member along the first direction and the second direction, and along the second direction on a plane perpendicular to the second direction, the projection of the through holes is a polygonal structure.

[0015] Optionally, the projection of the through hole is a regular hexagonal structure.

[0016] Optionally, the connection assembly further includes a cover plate, which is disposed between the connection member and the adhesive member, the cover plate is fixedly connected to the connection member and covers the through hole, and the adhesive member connects the cover plate and the battery cell.

[0017] In a second aspect, an embodiment of the present application provides a vehicle, the vehicle comprising a vehicle body and a battery pack as described in any one of the first aspects above;

[0018] The battery pack is installed in the vehicle body.

[0019] In the embodiment of the present application, since there is a gap between two adjacent battery columns, the connecting assembly is arranged in the gap, and therefore, in the first direction, the two adjacent battery columns can be connected by the connecting assembly. Specifically, since the connecting assembly includes a connecting member and an adhesive member, the adhesive member is arranged between the connecting member and the battery cell, that is, the adhesive member is arranged between the connecting member and the battery cell, and the adhesive member will bond the connecting member to the battery cell, so that the battery cells in the two adjacent battery columns that are opposite to each other along the first direction are connected through the adhesive member and the connecting member, thereby improving the reliability of the battery column connection and improving the overall structural strength of the battery pack. In addition, the connecting member is provided with a through hole, and the through hole passes through the connecting member along the first direction. After the battery pack is charged and discharged for a cycle, even if the battery cells in the two battery columns adjacent to the connecting assembly along the first direction in the plurality of battery columns expand along the first direction, the expansion of the battery cells in the two adjacent battery columns in the first direction that are opposite to each other will be absorbed by the through hole in the connecting member, thereby improving the service life of the battery pack. In addition, the through hole is arranged on the connecting member, and the through hole can also reduce the weight of the connecting member, thereby reducing the weight of the battery pack. That is, in the embodiment of the present application, by providing a connector and an adhesive, the connector and the adhesive are located between two adjacent battery columns, so that the battery cells in the two adjacent battery columns that are opposite to each other along the first direction can be connected by the adhesive, which is equivalent to connecting the two adjacent battery columns through the connecting assembly, and then when assembling the battery pack, multiple battery columns can be directly installed, which can improve the assembly efficiency and structural strength of the battery pack, and through holes are provided on the connector, so that when the battery pack is working, the expansion of the battery cells in the two adjacent battery columns is absorbed, and the connector can reduce the weight of the connector, thereby reducing the weight of the battery pack. That is, using the battery pack provided in the embodiment of the present application can improve the assembly efficiency and structural strength of the battery pack on the one hand, and absorb the expansion force of the battery cells in the battery pack on the other hand, improve the safety of the battery pack, and reduce the weight of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram showing a battery cell provided in an embodiment of the present application;

[0021] Figure 2 One of the schematic diagrams showing a battery pack provided in an embodiment of the present application;

[0022] Figure 3 A second schematic diagram showing a battery pack provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram showing a connection component provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram showing a connecting plate provided in an embodiment of the present application;

[0025] Figure 6 A cross-sectional view showing a connector provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram showing a connector provided in an embodiment of the present application;

[0027] Figure 8 A schematic diagram showing a cover plate provided in an embodiment of the present application;

[0028] Fig. 9 A cross-sectional view showing a connection assembly provided in an embodiment of the present application;

[0029] Fig.10 A cross-sectional view showing a connection assembly provided between battery cells according to an embodiment of the present application.

[0030] Reference numerals:

[0031] 10: battery array; 20: connecting assembly; 11: battery cell; 21: connecting piece; 201: first surface; 202: second surface; 210: first adhesive layer; 220: second adhesive layer; 200: adhesive piece; 2001: adhesive portion; 211: connecting plate; 212: functional layer; 213: cover plate; 30: adhesive limiting piece; X: first direction; Y: second direction; Z: third direction; D: gap. DETAILED DESCRIPTION

[0032] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means 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 objects connected before and after are in an "or" relationship.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] The term "parallel" in this application includes not only the absolute parallel situation, but also the generally parallel situation conventionally recognized in engineering, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°; at the same time, "vertical" also includes not only the absolute vertical situation, but also the generally vertical situation conventionally recognized in engineering, such as "vertical" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only the absolute equal situation, but also the generally equal situation conventionally recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] like Figures 1 to 10 As shown, the battery pack includes: a box body, a plurality of battery columns 10 and at least one connecting assembly 20. The box body has a receiving cavity, and the plurality of battery columns 10 and the connecting assembly 20 are arranged in the receiving cavity of the box body.

[0037] A plurality of battery columns 10 are distributed at intervals along a first direction X. There is a gap D between two adjacent battery columns 10 along the first direction X. At least one connection assembly 20 is provided in the gap D. Preferably, one connection assembly 20 is provided in one gap D. The battery column 10 includes a plurality of battery cells 11. The plurality of battery cells 11 are distributed along a second direction Y. The connection assembly 20 includes a connector 21 and an adhesive 200. The adhesive 200 is provided between the connector 21 and the battery cell 11 and connects the connector 21 and the battery cell 11. The connector 21 is provided with a through hole. The through hole penetrates the connector 21 along the first direction X. The first direction X intersects with the second direction Y. Preferably, the first direction X is perpendicular to the second direction Y.

[0038] In the embodiment of the present application, since there is a gap D between two adjacent battery columns 10, and the connecting assembly 20 is disposed in the gap D, the two adjacent battery columns 10 can be connected by the connecting assembly 20 in the first direction X. Specifically, since the connecting assembly 20 includes a connecting member 21 and an adhesive member 200, the adhesive member 200 is disposed between the connecting member 21 and the battery cell 11, that is, the adhesive member 200 is disposed between the connecting member 21 and the battery cell 11, and the adhesive member 200 will bond the connecting member 21 to the battery cell 11, so that the battery cells 11 in the two adjacent battery columns 10 that are opposite to each other along the first direction X are connected by the adhesive member 200 and the connecting member 21, and the structural strength is relatively high. In addition, the connector 21 is provided with a through hole, and the through hole penetrates the connector 21 along the first direction X. When the battery pack is working, even if the battery cells 11 in two battery columns 10 adjacent to each other along the first direction X expand along the first direction X, the expansion deformation of the battery cells 11 in the two adjacent battery columns 10 in the first direction X will be absorbed by the connector 21, thereby improving the service life of the battery pack. In addition, the through hole is provided on the connector 21, and the through hole can also reduce the weight of the connector 21, thereby reducing the weight of the battery pack. That is, in the embodiment of the present application, by providing the connector 21 and the adhesive 200, the connector 21 and the adhesive 200 are located between two adjacent battery columns 10, so that the battery cells 11 in the two adjacent battery columns 10 that are opposite to each other along the first direction X can be connected by the adhesive 200, which is equivalent to connecting the two adjacent battery columns 10 through the connecting assembly 20, and then when assembling the battery pack, multiple battery columns 10 can be directly installed, which can improve the assembly efficiency and structural strength of the battery pack, and the through hole is provided on the connector 21, so that when the battery pack is working, the expansion deformation of the battery cells 11 in the two adjacent battery columns 10 is absorbed, and the connector 21 can reduce the weight of the connector 21, thereby reducing the weight of the battery pack. That is, using the battery pack provided in the embodiment of the present application can improve the assembly efficiency and structural strength of the battery pack on the one hand, and absorb the expansion force of the battery cells 11 in the battery pack on the other hand, improve the safety of the battery pack, and reduce the weight of the battery pack.

[0039] It should be noted that when the battery pack is working, the battery cells 11 in the battery pack will expand. In the embodiment of the present application, along the first direction X, when two adjacent battery columns 10 are working, the battery cells 11 in each battery column 10 will expand along the first direction X, and along the first direction X, a connecting assembly 20 is provided between the two adjacent battery columns 10, and the connecting member 21 in the connecting assembly 20 is connected to the battery cell 11 through the adhesive 200, and the connecting member 21 is provided with a through hole along the first direction X, and the through hole can make the connecting member 21 have a certain deformation amount, so that after the expansion force of the battery cell 11 is transmitted to the connecting member 21, the connecting member 21 will produce a certain deformation, absorb the expansion force, and improve the safety of the battery pack.

[0040] In some embodiments, other components (such as the cover plate 213 described below) are provided between the adhesive 200 and the connector 21. In this case, the adhesive 200 can cover the through hole 2111 to increase the bonding area between the connecting assembly 20 and the battery cell 11, thereby improving the connection reliability between the two.

[0041] In other embodiments, other components (such as the cover plate 213 described below) may be provided between the adhesive 200 and the connecting member 21, or no other components may be provided. In this case, the through hole 2111 passes through the adhesive 200, that is, the position of the adhesive 200 corresponding to the through hole 2111 may also be empty, so as to reduce the amount of adhesive used and reduce the manufacturing cost.

[0042] In addition, in some embodiments, the connection assembly 20 may further include a glue limiting member 30, which is disposed on the side of the connection member 21 close to the battery cell 11, and defines a glue containing space with the connection member 21, and the adhesive member 200 is disposed in the glue containing space; the glue limiting member 30 and the through hole 2111 are spaced apart along the third direction Z. The first direction X, the second direction Y and the third direction Z intersect each other, and preferably, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0043] Since the adhesive limiting member 30 and the connecting member 21 define an adhesive space, when the adhesive 200 is set on the connecting member 21, the adhesive 200 can be set in the adhesive space, wherein the adhesive 200 can be a structural adhesive, a double-sided adhesive, etc., that is, in actual application, when the adhesive 200 needs to be set on the connecting member 21, the adhesive 200 can be directly set in the adhesive space, that is, the existence of the adhesive space is equivalent to the adhesive space having a guiding role when setting the adhesive 200, which is convenient for the operator to quickly identify the setting position of the adhesive 200, and setting the adhesive 200 in the sol space can prevent the adhesive from overflowing to other positions and affecting the subsequent assembly process of the battery pack. Among them, the adhesive limiting member 30 can extend along the second direction Y.

[0044] It should be noted that the battery pack may also have a third direction Z, which intersects with the first direction X and the second direction Y respectively. Preferably, the first direction X, the second direction Y and the third direction Z are perpendicular to each other. Along the third direction Z, the side of the connector 21 close to the battery cell 11 may be provided with adhesive limiting parts 30 spaced apart, so that along the third direction Z, the adhesive limiting parts 30 spaced apart and the side of the battery cell 11 may define an adhesive storage space, so that adhesive may be arranged in the adhesive storage space, and the adhesive 200 may be formed after the adhesive is solidified, and the adhesive limiting part 30 may block the adhesive in the third direction Z to prevent the adhesive from flowing to other positions after the adhesive is placed in the adhesive storage space.

[0045] In addition, in some embodiments, along the first direction X, the average size of the battery cells 11 is D1 mm, and the average size of the connecting assembly 20 is D2 mm, satisfying: 0<D2 / D1≤0.1.

[0046] Among them, if D2 / D1>0.1, the connection component 20 occupies too large a proportion in the battery pack, resulting in a smaller space occupied by the single cells inside the battery pack, which in turn leads to a lower volume utilization rate inside the battery pack. Therefore, in the embodiment of the present application, setting 0<D2 / D1≤0.1 can ensure that the volume utilization rate inside the battery pack meets the requirements, and the connection component 20 of appropriate size can also make the overall mode and strength of the battery pack meet the requirements.

[0047] It should be noted that, along the first direction X, the average size of the battery cell 11 may be the length of the battery cell 11, and along the first direction X, the average size of the connecting assembly 20 may be the thickness of the connecting assembly 20. The average size of the battery cell 11 and the average size of the connecting assembly 20 may be obtained by measuring different positions at least 3 times with a vernier caliper and taking the average value; the length of the battery cell 11 may range from 120 mm to 300 mm, and the thickness of the connecting assembly 20 may range from 1 m to 10 mm, so that a suitable thickness of the connecting assembly 20 may be selected, and battery cells 11 of different lengths may be used so that 0<D2 / D1≤0.1. For example, the length of the battery cell 11 is 150 mm, that is, D1 is 150 mm, and the thickness of the connecting component 20 is 10 mm, that is, D2 is 10 mm, then D2 / D1<0.1. For another example, the length of the battery cell 11 is 120 mm, that is, D1 is 120 mm, and the thickness of the connecting component 20 is 8 mm, that is, D2 is 8 mm, then D2 / D1<0.1. For another example, the length of the battery cell 11 is 300 mm, that is, D1 is 300 mm, and the thickness of the connecting component 20 is 10 mm, that is, D2 is 10 mm, then D2 / D1<0.1.

[0048] In other embodiments, the battery pack satisfies: 0.015<D2 / D1≤0.038, so as to better balance the volume utilization rate and the whole pack mode of the battery pack.

[0049] In some embodiments, the battery pack satisfies: 120≤D1≤300, so as to control the whole pack mode of the battery pack.

[0050] In some embodiments, the battery pack satisfies: 1≤D2≤10, so as to control the volume utilization of the battery pack.

[0051] In other embodiments, the battery pack simultaneously satisfies: 120≤D1≤300, 1≤D2≤10, so as to control the volume utilization rate and the whole pack mode of the battery pack.

[0052] In addition, in some embodiments, along the second direction Y, the average size of the battery cell 11 is D3 mm, and along the third direction Z, the average size of the battery cell 11 is D4 mm, satisfying: D3<D4, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. Wherein, D3 and D4 are the width and height of the battery cell, respectively, which can be obtained by measuring different positions at least 3 times with a vernier caliper and taking the average value.

[0053] Through such a setting, it is equivalent to connecting the smaller side of the battery cell 11 to the adhesive 200 in the connecting assembly 20, which is conducive to setting fewer connecting assemblies 20 between the battery columns 10, reducing the number and weight of the connecting assemblies 20, further improving the energy density of the battery pack, and reducing the manufacturing cost. In addition, through such a setting, it can be ensured that when the battery cell 11 is connected to the connecting assembly 20, the surface of the battery cell 11 along the second direction Y is connected to the connecting assembly 20, so that the two adjacent battery columns 10 are connected more firmly through the connecting assembly 20.

[0054] In addition, in some embodiments, the connecting member 21 has a first surface 201 and a second surface 202 relative to each other along the first direction X, and the adhesive member 200 includes a plurality of first adhesive layers 210 and a plurality of second adhesive layers 220, the plurality of first adhesive layers 210 are arranged at intervals on the first surface 201, and the plurality of second adhesive layers 220 are arranged at intervals on the second surface 202, and the first adhesive layers 210 and the second adhesive layers 220 are respectively connected to the battery columns 10 on both sides of the connecting member 21 along the first direction X.

[0055] In some embodiments, the plurality of first adhesive layers 210 and the second adhesive layers 220 are arranged at intervals along the second direction Y. In some embodiments, the plurality of first adhesive layers 210 are arranged at intervals along the second direction Y, and the plurality of second adhesive layers 220 are arranged at intervals along the third direction Z. In other embodiments, the plurality of first adhesive layers 210 and the plurality of second adhesive layers 220 are arranged at intervals along the third direction Z.

[0056] Through such an arrangement, it is equivalent to that both opposite surfaces of the connector 21 are provided with adhesive layers, so that after the connector 20 is arranged in the gap D between two adjacent battery columns 10 along the first direction X, the two opposite surfaces of the connector 21 can be connected to the two adjacent battery columns 10 through the first adhesive layer 210 and the second adhesive layer 220 respectively, so that the two adjacent battery columns 10 are more firmly connected through the connector 20. In addition, the adhesive layers arranged at intervals can reduce the amount of adhesive used, thereby reducing the manufacturing cost of the battery pack while ensuring the connection effect.

[0057] In addition, in some embodiments, the connecting member 21 includes a connecting plate 211 and a functional layer 212, the functional layer 212 is arranged on at least one side of the connecting plate 211 along the first direction X, and the adhesive 200 is arranged on the side of the functional layer 212 away from the connecting plate 211; the thermal conductivity of the functional layer 212 is τW / (m·K), and τ satisfies: 0<τ≤1.

[0058] In some other embodiments, the volume resistivity of the functional layer 212 is PΩ·m, which satisfies 10 6 ≤P≤10 19 .

[0059] In another embodiment, both 0<τ≤1 and 10 are satisfied. 6 ≤P≤10 19 .

[0060] By setting the functional layer 212, if the thermal conductivity τ of the functional layer 212 satisfies 0<τ≤1, then the functional layer 212 is equivalent to having a heat insulation effect. Therefore, after the connecting component 20 is set in the gap D between two adjacent battery columns 10, the functional layer 212 can prevent the battery cells 11 between the two adjacent battery columns 10 from transferring heat to each other, that is, the functional layer 212 can isolate the heat between the two adjacent battery columns 10, thereby reducing the probability of heat spread in the battery pack. If the volume resistivity P of the functional layer 212 satisfies 10 6 ≤P≤10 19 , the functional layer 212 has an insulating effect, so that after the connection component 20 is arranged in the gap D between two adjacent battery columns 10, the functional layer 212 can prevent the battery cells 11 between the two adjacent battery columns 10 from transmitting current to each other, that is, the functional layer 212 can isolate the current transmission between the two adjacent battery columns 10, thereby improving the safety of the battery pack. That is, by arranging the functional layer 212, the connection component 20 can have a certain insulation and / or heat insulation effect, which is beneficial to improving the safety of the battery pack.

[0061] In some embodiments, the functional layer 212 may be made of materials such as epoxy resin, aerogel, mica, rock wool, etc.

[0062] In addition, in some embodiments, the adhesive 200 includes a plurality of adhesive portions 2001 , which are spaced apart along the second direction Y, and along the first direction X on a plane perpendicular to the first direction X, a projection of a battery cell 11 covers a projection of at least one adhesive portion 2001 .

[0063] Through such an arrangement, when forming the adhesive member 200, a plurality of adhesive portions 2001 can be formed on the connector 21, and one battery cell 11 can correspond to at least one adhesive portion 2001 along the first direction X, thereby ensuring that each battery cell 11 in the battery array 10 is bonded to the connector 21 through the adhesive portion 2001. In addition, the projection of one battery cell 11 covers at least one adhesive portion 2001, thereby reducing the amount of adhesive used to form the adhesive member 200 and reducing the cost of the battery pack.

[0064] In addition, in some embodiments, there are multiple through holes 2111 distributed on the connecting member 21 along the first direction X and the second direction Y, and along the second direction Y on a plane perpendicular to the second direction Y, the projection of the through holes is a polygonal structure.

[0065] Since there are multiple through holes and they are distributed in the connector 21 along the first direction X and the second direction Y, the existence of multiple through holes can make the connector 21 have a certain degree of deformability, so that when the connection assembly 20 is set between two adjacent battery columns 10, once the battery cell 11 expands, the connector 21 can easily absorb the expansion force of the battery cell 11. That is, by setting the number and distribution of through holes, it is convenient for the connector 21 to absorb the expansion force of the battery cell 11.

[0066] In addition, in some embodiments, the projection of the through hole is a regular hexagonal structure.

[0067] Among them, the regular hexagonal structure is more stable than structures of other shapes. For example, each honeycomb is composed of a plurality of cells, and each cell is a regular hexagonal structure. Therefore, in the embodiment of the present application, the projection of the through hole is set to a regular hexagonal structure, so that after the through hole is set on the connector 21, the structural strength of the connector 21 is improved, which is beneficial to improve the structural strength of the battery pack.

[0068] Of course, in the embodiment of the present application, the projection of the through hole can also be other structures, for example, the projection of the through hole is a quadrilateral structure, another example, the projection of the through hole is a pentagonal structure, and another example, the projection of the through hole is an octagonal structure. This embodiment of the present application is not limited here.

[0069] In addition, in some embodiments, the battery pack may further include a cover plate 213 , which is disposed between the connector 21 and the adhesive 200 , the cover plate 213 is fixedly connected to the connector 21 and covers the through hole, and the adhesive 200 connects the cover plate 213 and the battery cell 11 .

[0070] By setting the cover plate 213, and the cover plate 213 is located between the connector 21 and the adhesive 200, the cover plate 213 can cover the through hole. That is, in the process of processing the battery pack, the cover plate 213 can first cover the through hole, and then the adhesive 200 can be set on the cover plate 213. Therefore, the existence of the cover plate 213 can prevent the adhesive glue of the adhesive 200 from flowing into the through hole, that is, the cover plate 213 is equivalent to providing a carrier for the adhesive 200, which is convenient for setting the adhesive 200. In addition, the existence of the cover plate 213 can also improve the strength of the connecting component 20, which is conducive to improving the strength of the battery pack.

[0071] In some embodiments, the cover plate 213 and the connector 21 may be an integrally formed structure, thereby improving the connection reliability between the two, thereby improving the connection reliability between the battery column 10 and the connecting assembly 20 in the battery pack.

[0072] In addition, in some embodiments, when the connection member 21 includes a connection plate 211 and a functional layer 212 , the cover plate 213 may be disposed on the functional layer 212 .

[0073] In addition, in the embodiment of the present application, the material of the connector 21 can be a single material, for example, the connector 21 is resin, aluminum alloy, etc. Of course, the material of the connector 21 can also be a composite material, that is, other materials are added to the connector 21 of a single material, and the other materials include but are not limited to flame retardants, glass fibers, etc.

[0074] In the embodiment of the present application, since there is a gap D between two adjacent battery columns 10, and the connecting assembly 20 is disposed in the gap D, the two adjacent battery columns 10 can be connected by the connecting assembly 20 in the first direction X. Specifically, since the connecting assembly 20 includes a connecting member 21 and an adhesive member 200, the adhesive member 200 is disposed between the connecting assembly 20 and the battery cell 11, that is, the adhesive member 200 is disposed between the connecting member 21 and the battery cell 11, and the adhesive member 200 will bond the connecting member 21 to the battery cell 11, so that the battery cells 11 in the two adjacent battery columns 10 that are opposite to each other along the first direction X are connected through the adhesive member 200 and the connecting member 21. In addition, the connector 21 is provided with a through hole, and the through hole penetrates the connector 21 along the first direction X, so that the connector 21 has a certain deformation ability in the first direction X. Therefore, when the battery pack is working, even if the battery cells 11 in two battery columns 10 adjacent to each other along the first direction X expand along the first direction X, the expansion force of the battery cells 11 in the two battery columns 10 adjacent to each other in the first direction X will be absorbed by the connector 21. In addition, the through hole is provided on the connector 21, and the weight of the connector 21 can be reduced, thereby reducing the weight of the battery pack. That is, in the embodiment of the present application, by providing the connector 21 and the adhesive 200, the connector 21 and the adhesive 200 are located between two adjacent battery columns 10, so that the battery cells 11 in the two adjacent battery columns 10 that are opposite to each other along the first direction X can be connected by the adhesive 200, which is equivalent to connecting the two adjacent battery columns 10 through the connecting assembly 20, and then when assembling the battery pack, multiple battery columns 10 can be directly installed, which can improve the assembly efficiency of the battery pack, and the through hole is provided on the connector 21, so that when the battery pack is working, the expansion force of the battery cells 11 in the two adjacent battery columns 10 is absorbed, and the connector 21 can reduce the weight of the connector 21, thereby reducing the weight of the battery pack. That is, using the battery pack provided in the embodiment of the present application can improve the assembly efficiency of the battery pack on the one hand, and absorb the expansion force of the battery cells 11 in the battery pack on the other hand, improve the safety of the battery pack, and reduce the weight of the battery pack.

[0075] Test Example 1-18:

[0076] A battery pack includes a box, a plurality of battery columns 10 and a plurality of connecting assemblies 20, wherein the plurality of battery columns 10 and the plurality of connecting assemblies 20 are alternately arranged along a first direction X and arranged in the box; the battery columns 10 include a plurality of battery cells 11 distributed along a second direction Y, the connecting assemblies 20 include a connecting member 21 and an adhesive member 200, the adhesive member 200 is arranged between the connecting member 21 and the battery cells 11 and connects the battery cells 11 and the connecting member 21, the connecting member 21 is provided with a through hole 2111; the through hole 2111 penetrates the connecting member 21 along the first direction X; the adhesive member 200 covers the through hole 2111.

[0077] Along the first direction X, the average size of the battery cells 11 is D1 mm, and the average size of the connecting assembly 20 is D2 mm.

[0078] Test method:

[0079] 1) Modality:

[0080] Fix the battery pack on the test bench, arrange acceleration and amplitude sensors, and perform a sinusoidal frequency sweep of 5 to 250 Hz in the Z direction of the battery pack at an acceleration of 0.5 g in a 25°C environment. The sweep rate is 1.0 (oct / min). The frequency when the battery pack produces the maximum amplitude is recorded as the mode of the battery pack.

[0081] 2) Volume utilization:

[0082] a) Use a vernier caliper to measure the length, width and height of the battery cell 11 at least 3 times and take the average values ​​respectively;

[0083] b) calculating the volume V1 of the battery cell 11 using the average value of the length, width and height;

[0084] c) The volume of the energy body V2 = number of battery cells × V1;

[0085] d) Use a vernier caliper to measure the volume V3 of the containing cavity of the box at least three times;

[0086] e) Volume utilization = V2 / V3×%.

[0087] The above test method is used to test test cases 1-18, and the data obtained are as follows:

[0088]

[0089]

[0090] It can be seen from the above test examples that when D2 / D1 is greater than 0.1, although the mode can reach a higher level, the volume utilization rate will drop to a lower level. In addition, when the connecting component 20 exists, D2 / D1 cannot be 0. Therefore, when the battery pack satisfies 0<D2 / D1≤0.1, the mode and volume utilization rate of the entire pack can be taken into account.

[0091] An embodiment of the present application also provides a vehicle, which includes a vehicle body and a battery pack in any of the above embodiments; the battery pack is installed in the vehicle body.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0093] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: The battery pack includes: a plurality of battery columns and at least one connecting component; The plurality of battery columns are spaced apart and distributed along a first direction, and there is a gap between two adjacent battery columns, and at least one connecting component is disposed in the gap; The battery column includes a plurality of battery cells, and the plurality of battery cells are distributed along a second direction. The connecting assembly includes a connecting member and an adhesive member, and the adhesive member is arranged between the connecting member and the battery cells and connects the connecting member and the battery cells. The connecting member is provided with a through hole; the through hole penetrates the connecting member along the first direction; the adhesive member covers the through hole, or the through hole penetrates the adhesive member; and the first direction intersects with the second direction.

2. The battery pack according to claim 1, characterized in that: The connecting component also includes a glue limiting component, which is arranged on the side of the connecting component close to the battery cell and defines a glue containing space with the connecting component, and the adhesive component is arranged in the glue containing space; the glue limiting component and the through hole are arranged at intervals along the third direction, and the first direction, the second direction and the third direction intersect each other.

3. The battery pack according to claim 1, characterized in that: Along the first direction, the average size of the battery cells is D1 mm, and the average size of the connecting assembly is D2 mm, satisfying: 0<D2 / D1≤0.

1.

4. The battery pack according to claim 1, characterized in that: Along the second direction, the average size of the battery cells is D3 mm, and along the third direction, the average size of the battery cells is D4 mm, satisfying: D3<D4, and D4<D1, and the first direction, the second direction and the third direction intersect each other.

5. The battery pack according to claim 1, characterized in that: The connecting member has a first surface and a second surface opposite to each other along the first direction, the adhesive member includes a plurality of first adhesive layers and a plurality of second adhesive layers, the plurality of first adhesive layers are arranged at intervals on the first surface, the plurality of second adhesive layers are arranged at intervals on the second surface, and the first adhesive layers and the second adhesive layers are respectively connected to the battery columns on both sides of the connecting member along the first direction.

6. The battery pack according to claim 1, characterized in that: The connecting member comprises a connecting plate and a functional layer, wherein the functional layer is arranged on at least one side of the connecting plate along the first direction, and the adhesive is arranged on a side of the functional layer away from the connecting plate; the thermal conductivity of the functional layer is τW / (m·K), wherein τ satisfies: 0<τ≤1, and / or the volume resistivity of the functional layer is PΩ·m, which satisfies 10 6 ≤P≤10 19 .

7. The battery pack according to claim 1, characterized in that: The adhesive member includes a plurality of adhesive portions, the plurality of adhesive portions are arranged at intervals along the second direction, and along the first direction on a plane perpendicular to the first direction, a projection of one of the battery cells covers a projection of at least one of the adhesive portions.

8. The battery pack according to claim 1, characterized in that: There are multiple through holes distributed on the connecting member along the first direction and the second direction. Along the second direction on a plane perpendicular to the second direction, the projection of the through holes is a polygon or a regular hexagon.

9. The battery pack according to claim 1, characterized in that: The connection assembly further includes a cover plate, which is disposed between the connection member and the adhesive member, the cover plate is fixedly connected to the connection member and covers the through hole, and the adhesive member connects the cover plate and the battery cell.

10. The battery pack according to claim 3, characterized in that: The battery pack satisfies: 0.015<D2 / D1≤0.

038.

11. The battery pack according to claim 3, characterized in that: The battery pack satisfies: 120≤D1≤300, and / or, 1≤D2≤10.

12. A vehicle, characterized in that: The vehicle comprises a vehicle body and a battery pack according to any one of claims 1 to 11; The battery pack is installed in the vehicle body.

Images