Battery pack

Abstract

The utility model discloses a kind of battery pack, the battery pack includes: shell;Battery module is located in shell, including respectively the end plate of the both ends of battery module and the several electric core of being set between end plate;Wherein, the bottom of end plate is provided with elastic member and recessed yielding area, the bottom of the inner side wall of shell is provided with recess, in the process of installing battery module to shell, elastic member occurs bending and is embedded into yielding area, until elastic member and recess are connected;When elastic member and recess are connected, the end plate main body face above the bending trajectory of elastic member is all with the inner side wall of shell abut. The battery pack can increase the contact area of end plate and shell, improve the stress area distribution of battery module, so as to improve the pre-tightening force size and uniformity of electric core.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] In existing technologies, after the battery module is inserted into the casing, it will slightly shift towards the top of the battery pack due to the escape space at the top, causing it to float upwards. To solve this problem, a snap-fit ​​structure is usually used to snap the battery module and the inner wall of the casing together. However, because the end plate and the inner wall of the casing only abut against each other in a localized area, the stress distribution of the battery module is uneven, resulting in uneven stress on the cells. Utility Model Content

[0003] In view of this, the present invention provides a battery pack to solve the technical problem of uneven stress on the battery cells.

[0004] To achieve the above objectives, this utility model provides a battery pack, including...

[0005] case;

[0006] The battery module, located inside the housing, includes end plates located at both ends of the battery module and a plurality of battery cells disposed between the end plates.

[0007] The end plate has an elastic element and a recessed relief area at its bottom, and the inner wall of the housing has a recess at its bottom. During the installation of the battery module into the housing, the elastic element bends and embeds itself into the relief area until the elastic element engages with the recess. When the elastic element engages with the recess, the main surface of the end plate along the bending trajectory of the elastic element abuts against the inner wall of the housing.

[0008] Optionally, during the installation of the battery module into the housing, the distance from the farthest end of the elastic member to the concave bottom surface of the relief area is greater than or equal to a preset distance along a direction perpendicular to the surface of the end plate.

[0009] Optionally, when the elastic element bends, the orthographic projection of the elastic element on the end plate is located within the yielding area.

[0010] Optionally, the area of ​​the orthographic projection is less than or equal to the area of ​​the setback region.

[0011] Optionally, the elastic element is disposed at the bottom edge of the end plate.

[0012] Optionally, the number of elastic elements is the same as the number of yielding areas, and each elastic element corresponds one-to-one with each yielding area.

[0013] Optionally, the end of the elastic element that connects to the end plate has a rounded corner.

[0014] Optionally, the center of the fillet is located away from the end plate.

[0015] This utility model embodiment can not only increase the contact area between the end plate and the shell, improve the force distribution of the battery module, thereby increasing the magnitude and uniformity of the pre-tightening force on the battery cell, but also reduce the resistance during the installation process and improve the assembly efficiency of the battery pack.

[0016] The further effects of the aforementioned unconventional alternative methods will be explained below in conjunction with specific implementation methods. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a longitudinal cross-sectional schematic diagram of a battery pack according to an embodiment of the present utility model;

[0019] Figure 2 This is a front view of the end plate according to an embodiment of the present utility model;

[0020] Figure 3 yes Figure 2 A schematic diagram of the cross-section along the AA direction;

[0021] Figure 4a and Figure 4b This is a longitudinal cross-sectional schematic diagram of an elastic member according to an embodiment of the present invention;

[0022] Figure 5 This is a longitudinal cross-sectional schematic diagram of an elastic member according to another embodiment of the present invention.

[0023] The attached figures are labeled as follows:

[0024] 10-Shell;

[0025] 11-Inner wall;

[0026] 12-Depression;

[0027] 20-Battery Module;

[0028] 21-End plate;

[0029] 22-cell;

[0030] 23-Elastic element;

[0031] 24 - Setback Zone;

[0032] 25 - Rounded corners. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] This utility model embodiment provides a battery pack, such as Figure 1-3As shown, the battery pack includes a housing 10 and a battery module 20 located inside the housing 10. The battery module 20 includes end plates 21 located at both ends of the battery module 20 and a plurality of battery cells 22 disposed between the end plates 21. The bottom of the end plate 21 is provided with an elastic element 23 and a recessed relief area 24. The bottom of the inner sidewall 11 of the housing 10 is provided with a recessed portion 12. During the process of installing the battery module 20 into the housing 10, the elastic element 23 bends and embeds into the relief area 24 until the elastic element 23 engages with the recessed portion 12. When the elastic element 23 engages with the recessed portion 12, the main surface of the end plate 21 above the bending trajectory of the elastic element 23 abuts against the inner sidewall 11 of the housing 10.

[0037] Because the end plate 21 has an elastic element 23 and a recessed relief area 24 at its bottom, during the installation of the battery module 20 onto the housing 10, the elastic element 23 is tightly attached to the inner wall 11 of the housing 10. The elastic element 23 is pressed into the relief area 24 by the inner wall 11 until it engages with the recessed portion 12. This reduces resistance during installation and improves the assembly efficiency of the battery pack. When the elastic element 23 engages with the recessed portion 12, it returns to its original shape and protrudes from the surface of the end plate 21. Moreover, when the elastic member 23 engages with the recessed portion 12, the main surface of the end plate 21 above the bending trajectory of the elastic member 23 abuts against the inner wall 11 of the housing 10. In other words, except for the relief area 24, the surface of the end plate 21 abuts against the inner wall 11 of the housing 10, which helps to increase the contact area between the end plate 21 and the housing 10, improve the force distribution of the battery module, and thus improve the magnitude and uniformity of the pre-tightening force on the cell 22.

[0038] In some embodiments of this utility model, such as Figure 4a As shown, during the process of installing the battery module 20 into the housing 10, along the direction perpendicular to the surface of the end plate 21 (e.g. Figure 4a (As shown by the dotted line in the diagram), the distance (L) from the farthest end of the elastic element 23 to the concave bottom surface of the relief area 24 is greater than or equal to a preset distance. That is, during the installation of the battery module 20 into the housing 10, although the elastic element 23 is embedded within the relief area 24, the elastic element 23 maintains a certain distance (L) from the concave bottom surface of the relief area 24; they are not in close contact, to prevent the elastic element 23 from easily breaking due to large deformation. It should be noted that this invention does not limit the size of the preset distance and can be designed according to actual needs.

[0039] Optionally, when the elastic element 23 bends, such as Figure 4b As shown, the orthographic projection of the elastic element 23 onto the end plate 21 (e.g.) Figure 4bIf the projection in the direction indicated by the middle arrow is located within the recessed area 24, then during the process of installing the battery module 20 into the housing 10, the elastic element 23 can be fully embedded within the recessed area 24, thereby further reducing the resistance during the installation process.

[0040] Optionally, when the elastic element 23 bends, the area of ​​the orthographic projection of the elastic element 23 on the end plate 21 is less than or equal to the area of ​​the relief area 24. This can minimize the area of ​​the relief area 24, so as to ensure that the area of ​​the main surface of the end plate 21 that abuts against the inner sidewall 11 of the housing 10 is as large as possible. This helps to increase the contact area between the end plate 21 and the housing 10, improve the force distribution of the battery module, and thus improve the magnitude and uniformity of the pre-tightening force on the cell 22.

[0041] Optionally, such as Figure 1 and Figure 2 As shown, the elastic element 23 is disposed at the bottom edge of the end plate 21 to maximize the main surface of the end plate 21 above the bending trajectory of the elastic element 23, which helps to increase the contact area between the end plate 21 and the housing 10, improve the force distribution of the battery module, and thus improve the magnitude and uniformity of the pre-tightening force on the cell 22.

[0042] It should be noted that the number of elastic elements 23 can be one or more, and the number of relief areas 24 can be one or more, as long as all elastic elements 23 can be embedded in the relief areas 24.

[0043] In some embodiments of this utility model, there are multiple elastic elements 23 and multiple relief areas 24, and the number of elastic elements 23 is the same as the number of relief areas 24, with each elastic element 23 corresponding to each relief area 24. That is, during the process of installing the battery module 20 into the housing 10, each elastic element 23 is embedded in the corresponding relief area 24, and each relief area 24 only accommodates one elastic element 23. This ensures that the surface area of ​​the end plate 21 other than the relief area 24 is maximized, which helps to increase the contact area between the end plate 21 and the housing 10, improve the force distribution of the battery module 20, and thus improve the magnitude and uniformity of the preload force on the cell 22.

[0044] In some embodiments of this utility model, such as Figure 5 As shown, the end of the elastic member 23 connected to the end plate 21 has a rounded corner 25. When the elastic member 23 moves to the recess 12 of the housing 10, the rounded corner 25 at the end can quickly spring the elastic member 23 back into the recess 12, and make the elastic member 23 and the recess 12 firmly engaged. Optionally, the center of the rounded corner 25 is away from the end plate 21, so that the elastic member 23 can quickly spring back into the recess 12, and make the elastic member 23 and the recess 12 firmly engaged.

[0045] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A battery pack, characterized in that, include: case; The battery module, located inside the housing, includes end plates located at both ends of the battery module and a plurality of battery cells disposed between the end plates. The end plate has an elastic element and a recessed relief area at its bottom, and the inner wall of the housing has a recess at its bottom. During the installation of the battery module into the housing, the elastic element bends and embeds itself into the relief area until the elastic element engages with the recess. When the elastic element engages with the recess, the main surface of the end plate along the bending trajectory of the elastic element abuts against the inner wall of the housing.

2. The battery pack according to claim 1, characterized in that, During the installation of the battery module into the housing, along the direction perpendicular to the surface of the end plate, the distance from the farthest end of the elastic member to the concave bottom surface of the relief area is greater than or equal to a preset distance.

3. The battery pack according to claim 1, characterized in that, When the elastic element bends, the orthographic projection of the elastic element on the end plate lies within the yielding area.

4. The battery pack according to claim 3, characterized in that, The area of ​​the orthographic projection is less than or equal to the area of ​​the setback region.

5. The battery pack according to claim 1, characterized in that, The elastic element is disposed at the bottom edge of the end plate.

6. The battery pack according to claim 1, characterized in that, The number of elastic elements is the same as the number of yielding areas, and each elastic element corresponds one-to-one with each yielding area.

7. The battery pack according to any one of claims 1-6, characterized in that, The end of the elastic element that connects to the end plate has a rounded corner.

8. The battery pack according to claim 7, characterized in that, The center of the rounded corner is away from the end plate.

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