Battery pack

Abstract

The utility model relates to a battery pack, the battery pack comprises a box body, a limiting structure and a plurality of battery cell groups, and the limiting structure is detachably connected to the box body and is used for installing and fixing the plurality of battery cell groups to the box body. Wherein the plurality of battery cell groups are arranged in the box body along a first direction X, each battery cell group comprises a plurality of battery cells arranged along a second direction Y, and the two sides of each battery cell along the first direction X are respectively provided with a first limiting step. The limiting structure comprises a first end plate, a second end plate and a plurality of limiting brackets, and the first end plate and the second end plate are distributed at intervals along the second direction Y and are used for clamping the battery cell group. In the first direction X, the limiting bracket is clamped between two adjacent rows of battery cell groups or clamped between the battery cell groups and the side wall of the box body, and in the third direction Z, the limiting bracket is pressed on the first limiting step; wherein the first direction X, the second direction Y and the third direction Z are perpendicular to one another. The battery pack provided by the utility model can effectively reduce shaking of the battery cells.

Description

Technical Field

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

[0002] The battery pack is an important part of the power battery system. There are a large number of cells inside a battery pack. Battery packs with different capacities are fixed together by different cells in different combinations. Currently, conventional cells are rectangular cells and cylindrical cells, which are often fixed in the box by complex mechanical structures or structural adhesives. The assembled cells are prone to shaking. Utility Model Content

[0003] Based on this, it is necessary to provide a battery pack to solve the problem that the assembled battery cells are prone to shaking in the box.

[0004] A battery pack includes a case, a limiting structure and a plurality of battery cell groups, wherein the limiting structure is detachably connected to the case and is used to install and fix the plurality of battery cell groups to the case. The plurality of battery cell groups are arranged along a first direction X in the case, each battery cell group includes a plurality of battery cells arranged along a second direction Y, and each battery cell is provided with a first limiting step on both sides along the first direction X. The limiting structure includes a first end plate, a second end plate and a plurality of limiting brackets, wherein the first end plate and the second end plate are spaced apart and used to clamp the battery cell groups along the second direction Y. Along the first direction X, the limiting bracket is clamped between two adjacent columns of battery cell groups or between the battery cell group and the side wall of the case, and along the third direction Z, the limiting bracket is crimped to the first limiting step; wherein the first direction X, the second direction Y and the third direction Z are arranged perpendicular to each other.

[0005] In one embodiment, the first end plate and the second end plate are respectively connected to the two ends of the limiting bracket along the second direction Y. It can be understood that, in this configuration, the first end plate, the second end plate and the limiting bracket are connected to form a more stable limiting structure, which is conducive to more firmly fixing the multiple battery cells.

[0006] In one embodiment, a plurality of first mounting positions are provided on the second end plate, and the plurality of first mounting positions are spaced apart along the first direction X, and a plurality of second mounting positions are provided on each limit bracket, and the plurality of second mounting positions are spaced apart along the second direction Y. The number of first mounting positions is the same as the number of limit brackets, and each first mounting position is used to install a limit bracket, and can switch between the plurality of second mounting positions on the limit bracket. It can be understood that such a configuration allows the spacing between the first end plate and the second end plate to be adjustable along the second direction Y, that is, the number of battery cells contained in each battery cell group can be freely adjusted according to demand. Therefore, the number of battery cells can be conveniently increased or decreased according to power demand.

[0007] In one embodiment, on each limiting bracket, a plurality of second mounting positions are evenly spaced along the second direction Y. It is understandable that such a configuration facilitates adjusting the spacing between the first end plate and the second end plate to match the thickness of a single battery cell.

[0008] In one of the embodiments, the battery pack further includes a plurality of connectors, the number of which is configured to be the same as the number of the first mounting positions, and the connectors are used to connect the first mounting positions to the corresponding second mounting positions.

[0009] In one embodiment, the battery pack further includes a fastener, and the connecting member includes a first connecting portion and a second connecting portion arranged at an angle. The first connecting portion is detachably connected to the first mounting position through the fastener, and the second connecting portion is detachably connected to the second mounting position by connecting to the second mounting position. It can be understood that such a configuration facilitates the connecting member to adapt to the relative position of the second end plate and the limiting bracket, and the second end plate and the limiting bracket are respectively connected through the first connecting portion and the second connecting portion.

[0010] In one embodiment, the first connection portion is parallel to the second end plate; along the third direction Z, the second connection portion is attached to the upper surface of the limit bracket. It is understandable that, in this arrangement, the connection member can be first installed on the limit bracket through the second connection portion, and then the first connection portion is connected to the second end plate, so as to facilitate the assembly of the limit bracket, the connection member and the second end plate.

[0011] In one embodiment, a plurality of avoidance notches are provided on the second end plate, and the avoidance notches are provided corresponding to the limit brackets and are used for the limit brackets to pass through. It can be understood that, in such a configuration, the second end plate avoids the limit brackets through the avoidance notches, so that the second end plate and the limit brackets are connected together more compactly, which is conducive to saving space in the box.

[0012] In one embodiment, the cross section of the limiting bracket is L-shaped or T-shaped. It is understandable that such a configuration can avoid a large gap between the limiting bracket located at the edge and the side wall of the box body, resulting in space waste.

[0013] In one embodiment, the battery cell is T-shaped.

[0014] Compared with the prior art, the battery pack provided in the present application installs multiple battery cells in a box body through a first end plate, a second end plate and a limiting bracket. Specifically, the first end plate cooperates with the second end plate to prevent the battery cells from shaking in the second direction Y, and the limiting bracket prevents the battery cells from shaking in the first direction X and the third direction Z, so that the multiple battery cells can be firmly installed and fixed in the box body, and by arranging a first limiting step on the battery cells, the limiting bracket can be conveniently crimped and matched with the battery cells along the third direction Z. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 An axonometric view of the battery pack provided for this application;

[0017] Figure 2 for Figure 1 An enlarged schematic diagram at A;

[0018] Figure 3 A schematic diagram of the structure of the battery cell provided in this application;

[0019] Figure 4 A schematic diagram of the structure of a limiting bracket according to an embodiment of the present application;

[0020] Figure 5 A schematic structural diagram of a position limiting bracket according to another embodiment of the present application;

[0021] Figure 6 A schematic diagram of the structure of the second end plate provided in this application;

[0022] Figure 7 A schematic diagram of the structure of the connector provided in this application.

[0023] Figure numerals: 100, battery pack; 10, box body; 20, limiting structure; 21, first end plate; 22, second end plate; 221, first mounting position; 23, limiting bracket; 231, second mounting position; 234, second limiting step; 235, beam; 236, limiting plate; 25, avoidance gap; 30, battery cell group; 31, battery cell; 311, first limiting step; 40, connector; 41, first connecting part; 411, connecting threaded hole; 42, second connecting part; 43, connector through hole; 50, fastener. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0029] See also Figure 1 and Figure 3The present application provides a battery pack 100, which includes a box body 10, a limiting structure 20 and a plurality of battery cell groups 30. The limiting structure 20 is detachably connected to the box body 10 and is used to install and fix the plurality of battery cell groups 30 to the box body 10. The plurality of battery cell groups 30 are arranged along a first direction X in the box body 10, each battery cell group 30 includes a plurality of battery cells 31 arranged along a second direction Y, and each battery cell 31 is provided with a first limiting step 311 on both sides along the first direction X. The limiting structure 20 includes a first end plate 21, a second end plate 22 and a plurality of limiting brackets 23. The first end plate 21 and the second end plate 22 are spaced apart and arranged along the second direction Y and are used to clamp the battery cell group 30. Along the first direction X, the limiting bracket 23 is sandwiched between two adjacent columns of battery cell groups 30 or between the battery cell group 30 and the side wall of the box body 10, and along the third direction Z, the limiting bracket 23 is crimped to the first limiting step 311. Among them, the first direction X, the second direction Y and the third direction Z are arranged perpendicular to each other. A plurality of battery cells 31 are installed in the box body 10 by means of the first end plate 21, the second end plate 22 and the limiting bracket 23. Specifically, the first end plate 21 cooperates with the second end plate 22 to prevent the battery cells 31 from shaking in the second direction Y. The limiting bracket 23 prevents the battery cells 31 from shaking in the first direction X and the third direction Z, so that the plurality of battery cells 31 can be firmly installed and fixed in the box body 10, and by setting the first limiting step 311 on the battery cells 31, it is convenient for the limiting bracket 23 to be crimped and matched with the battery cells 31 along the third direction Z.

[0030] Exemplarily, the second direction Y may be a thickness direction of the battery cell 31 , the second direction Y is a length direction of the battery cell 31 , and the third direction Z is a height direction of the battery cell 31 .

[0031] Optionally, in one embodiment, if Figure 3 As shown, the battery cell 31 is T-shaped. Thus, two first limiting steps 311 are formed at both ends of the short side of the T-shaped battery cell 31, that is, the two first limiting steps 311 of the battery cell 31 have the same height in the third direction Z. Of course, in other embodiments, the heights of the two first limiting steps 311 of the battery cell 31 in the third direction Z may also be different.

[0032] See also Figure 1 , Figure 4 and Figure 5 In one embodiment, the cross section of the limiting bracket 23 is L-shaped or T-shaped. Figure 4 As shown, the limiting bracket 23 with a T-shaped cross section is used to be installed between two adjacent columns of battery cell groups 30, and two second limiting steps 234 are formed on both sides along the first direction X. The two second limiting steps 234 are respectively used to press fit with the first limiting steps 311 of the two adjacent columns of battery cell groups 30. Figure 5As shown, the limiting bracket 23 with an L-shaped cross section is used to be installed between the battery cell group 30 located at the edge and the side wall of the box body 10, and a second limiting step 234 is formed on one side along the first direction X for crimping with the first limiting step 311 located at the edge; a plane is formed on the other side along the first direction X for abutting against the inner wall of the box body 10. In this way, a large gap can be avoided between the limiting bracket 23 located at the edge and the side wall of the box body 10, which causes space waste.

[0033] Optionally, the limiting bracket 23 includes a crossbeam 235 and a limiting plate 236, and the crossbeam 235 and the limiting plate 236 are detachably connected to form a limiting bracket 23 with an L-shaped or T-shaped cross section. The connection method may be a bolt connection or a clamping connection.

[0034] Please continue reading Figure 1 , along the second direction Y, the first end plate 21 and the second end plate 22 are respectively connected to the two ends of the limiting bracket 23. In this way, the first end plate 21, the second end plate 22 and the limiting bracket 23 are connected to form a more stable limiting structure 20, which is conducive to more firmly fixing the multiple battery cells 31.

[0035] Further, a plurality of first mounting positions 221 are provided on the second end plate 22, and the plurality of first mounting positions 221 are spaced apart along the first direction X, and a plurality of second mounting positions 231 are provided on each limit bracket 23, and the plurality of second mounting positions 231 are spaced apart along the second direction Y. The number of first mounting positions 221 is the same as the number of limit brackets 23, and each first mounting position 221 is used to install a limit bracket 23, and can switch between the plurality of second mounting positions 231 on the limit bracket 23. By setting the first mounting position 221 and the second mounting position 231, the spacing between the first end plate 21 and the second end plate 22 along the second direction Y can be adjusted, that is, the number of battery cells 31 contained in each battery cell group 30 can be freely adjusted according to demand. Therefore, the number of battery cells 31 can be conveniently increased or decreased according to power demand.

[0036] Optionally, on each limiting bracket 23, a plurality of second mounting positions 231 are evenly spaced and distributed along the second direction Y. Generally, in each battery cell group 30, the battery cells 31 have the same dimensions such as thickness, length and height. By setting a plurality of second mounting positions 231 evenly spaced and distributed along the second direction Y, the thickness of a single battery cell 31 can be matched to facilitate adjusting the spacing between the first end plate 21 and the second end plate 22.

[0037] See also Figure 1 and Figure 2 and Figure 7The battery pack further includes a plurality of connectors 40 , the number of which is configured to be the same as the number of the first mounting positions 221 , and the connectors 40 are used to connect the first mounting positions 221 to the corresponding second mounting positions 231 .

[0038] Furthermore, in one embodiment, the battery pack further includes a fastener 50, and the connector 40 has a first connector portion 41 and a second connector portion 42 disposed at an angle. The first connector portion 41 is detachably connected to the first mounting position 221 through the fastener 50, and the second connector portion 42 is detachably connected to the second mounting position 231 through the fastener 50. Since the second end plate 22 and the position limiting bracket 23 are disposed at an angle, the connector 40 is provided with the first connector portion 41 and the second connector portion 42 disposed at an angle, so that the connector 40 can adapt to the relative position of the second end plate 22 and the position limiting bracket 23, and the second end plate 22 and the position limiting bracket 23 are respectively connected through the first connector portion 41 and the second connector portion 42.

[0039] Alternatively, if Figure 5 As shown, along the third direction Z, the first connection portion 41 is arranged parallel to the second end plate 22. Along the third direction Z, the second connection portion 42 is attached to the upper surface of the limiting bracket 23. In this way, the connection member 40 can be first installed on the limiting bracket 23 through the second connection portion 42, and then the first connection portion 41 is connected to the second end plate 22, so as to facilitate the assembly of the limiting bracket 23, the connection member 40 and the second end plate 22.

[0040] For example, see Figure 2 , Figure 4 , Figure 6 and Figure 7 , the fastener 50 is configured as a fastening bolt, the second mounting position 231 is configured to include two threaded holes, two connecting member through holes 43 are provided on the second connecting portion 42 corresponding to the two threaded holes, and along the second direction Y, the two connecting member through holes 43 are respectively located on both sides of the first connecting portion 41, the fastening bolt is passed through the connecting member through holes 43 and is threadedly connected to the threaded holes to connect the second connecting portion 42 to the limiting bracket 23. The first mounting position 221 is configured as a mounting through hole, a connecting threaded hole 411 is provided on the first connecting portion 41 corresponding to the mounting through hole, the fastening bolt is passed through the mounting through hole and is threadedly connected to the connecting threaded hole 411 threaded hole to connect the first connecting portion 41 to the second end plate 22.

[0041] In one embodiment, if Figure 6As shown, a plurality of avoidance notches 25 are provided on the second end plate 22, and the avoidance notches 25 are arranged corresponding to the limit bracket 23 and are used for the limit bracket 23 to pass through. In this way, the second end plate 22 avoids the limit bracket 23 through the avoidance notches 25, so that the second end plate 22 and the limit bracket 23 are connected together more compactly, which is conducive to saving space in the box body 10.

[0042] When assembling the battery pack 100, first weld the first end plate 21 and the cross beam 235 to the bottom wall of the box body 10, then connect the limit plate 236 to the cross beam 235 by bolts to compress the battery cells 31 along the first direction Y and the third direction Z; then connect the connector 40 to different second mounting positions 231 by fastening bolts according to the number of battery cells 31; finally, pass the second end plate 22 through the limit bracket 23 and connect it to the connector 40 by fastening bolts to compress the battery cells along the first direction X.

[0043] The positions where the battery cell 31 , the first end plate 21 , the second end plate 22 , the limiting bracket 23 , the side wall of the box body 10 and the connecting piece 40 are connected to each other can be filled with foam to play an insulating and buffering role.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A battery pack, comprising a box (10), a limiting structure (20) and a plurality of battery cell groups (30), wherein the limiting structure (20) is detachably connected to the box (10) and is used to install and fix the plurality of battery cell groups (30) to the box (10); It is characterized in that A plurality of battery cell groups (30) are arranged in the box (10) along a first direction X, each of the battery cell groups (30) comprises a plurality of battery cells (31) arranged along a second direction Y, and each of the battery cells (31) is provided with first limiting steps (311) on both sides along the first direction X; The limiting structure (20) comprises a first end plate (21), a second end plate (22) and a plurality of limiting brackets (23); along the second direction Y, the first end plate (21) and the second end plate (22) are spaced apart and are used to clamp the battery cell group (30); along the first direction X, the limiting bracket (23) is clamped between two adjacent rows of the battery cell groups (30) or between the battery cell group (30) and the side wall of the box body (10); and along the third direction Z, the limiting bracket (23) is crimped to the first limiting step (311); wherein the first direction X, the second direction Y and the third direction Z are arranged perpendicular to each other.

2. The battery pack according to claim 1, characterized in that: Along the second direction Y, the first end plate (21) and the second end plate (22) are respectively connected to two ends of the limiting bracket (23).

3. The battery pack according to claim 2, characterized in that: The second end plate (22) is provided with a plurality of first mounting positions (221), and the plurality of first mounting positions (221) are distributed at intervals along the first direction X; each of the limiting brackets (23) is provided with a plurality of second mounting positions (231), and the plurality of second mounting positions (231) are distributed at intervals along the second direction Y; The number of the first mounting positions (221) is the same as the number of the limiting brackets (23); each of the first mounting positions (221) is used to mount a limiting bracket (23) and is capable of switching between a plurality of the second mounting positions (231) on the limiting bracket (23).

4. The battery pack according to claim 3, characterized in that: On each of the limiting brackets (23), a plurality of the second mounting positions (231) are evenly spaced and distributed along the second direction Y.

5. The battery pack according to claim 4, characterized in that: The battery pack further comprises a plurality of connectors (40), wherein the number of the connectors (40) is configured to be the same as the number of the first mounting positions (221), and the connectors (40) are used to connect the first mounting positions (221) to the corresponding second mounting positions (231).

6. The battery pack according to claim 5, characterized in that: The battery pack further comprises a fastener (50), wherein the connecting member (40) comprises a first connecting portion (41) and a second connecting portion (42) which are arranged at an angle; The first connection portion (41) is detachably connected to the first mounting position (221) via the fastener (50), and the second connection portion (42) is detachably connected to the second mounting position by connecting to the second mounting position (231).

7. The battery pack according to claim 6, characterized in that: The first connection portion (41) is parallel to the second end plate (22); along the third direction Z, the second connection portion (42) is attached to the upper surface of the limiting bracket (23).

8. The battery pack according to claim 4, characterized in that: The second end plate (22) is provided with a plurality of avoidance notches (25), the avoidance notches (25) being arranged corresponding to the limit bracket (23) and being used for the limit bracket (23) to pass through.

9. The battery pack according to claim 1, characterized in that: The cross section of the limiting bracket (23) is L-shaped or T-shaped.

10. The battery pack according to claim 1, characterized in that: The battery core (31) is T-shaped.

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