Battery cell, battery module and battery pack

Abstract

The utility model discloses a battery cell, a battery module and a battery pack, which comprise a battery cell body and a liquid cooling plate positioned below the battery cell body, and are characterized in that heat conduction structural adhesive is arranged between the battery cell body and the liquid cooling plate, the battery cell body comprises a battery cell aluminum shell, and a plurality of concave parts or convex parts are arranged at the bottom of the battery cell aluminum shell. According to the utility model, the concave or convex characteristics are processed at the bottom of the battery cell aluminum shell to increase the contact area of the battery cell and the heat-conducting structural adhesive, so that compared with the traditional mode that the battery cell and the heat-conducting structural adhesive are only in plane contact, the effect of shearing force is increased, the reliability of connection between the battery cell and the liquid cooling plate is improved, and the safety of the battery pack is improved; according to the utility model, the aluminum shell is coated with the insulating coating, so that the characteristics of the surface of the bottom of the aluminum shell of the battery cell can be reserved to the greatest extent compared with the traditional mode that the surface of the battery cell is coated with a blue film.

Description

A battery cell, battery module and battery pack Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically to a battery cell, battery module, and battery pack. Background Technology

[0002] Cell-to-pack (CTP) assembly technology offers advantages such as higher energy density and lower cost compared to traditional cell-to-module (CTM) assembly technology. However, in CTP battery packs, the cells are primarily secured by bonding the bottom of the cell to the liquid cooling plate using thermally conductive structural adhesive. Since the bottom of the cell is a flat surface covered with a blue film, the adhesion between the cell and the liquid cooling plate can be reduced, posing a risk of delamination and potentially affecting the safety of the battery pack.

[0003] Currently, the common method to increase the adhesion between the cell and the liquid cooling plate is to cut out a section of the blue film at the bottom of the cell (i.e., to expose the aluminum shell directly). However, this method poses a risk of insulation failure due to the direct exposure of the aluminum shell. How to improve the adhesion between the cell and the liquid cooling plate, so that the cell can be stably and reliably fixed in the battery pack, is an urgent problem to be solved. Summary of the Invention

[0004] The technical problem to be solved by this utility model is: how to improve the adhesion between the battery cell and the liquid cooling plate.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A battery cell includes a battery cell body and a liquid cooling plate located below the battery cell body, characterized in that a thermally conductive structural adhesive is provided between the battery cell body and the liquid cooling plate, the battery cell body includes a battery cell aluminum shell, and the bottom of the battery cell aluminum shell is provided with a plurality of recesses or protrusions.

[0007] This invention utilizes recessed or raised features machined into the bottom of the aluminum casing of the battery cell to increase the contact area between the battery cell and the thermally conductive structural adhesive. Compared to the traditional method where the battery cell and the thermally conductive structural adhesive only have a planar contact, this method increases the shear force, improves the connection reliability between the battery cell and the liquid cooling plate, and enhances the safety of the battery pack.

[0008] As a further embodiment of this utility model, the outer surface of the aluminum shell of the battery cell is covered with an insulating coating.

[0009] This invention uses an insulating coating to cover the aluminum shell, which, compared with the traditional method of covering the surface of the battery cell with a blue film, can preserve the characteristics of the bottom surface of the aluminum shell of the battery cell to the greatest extent.

[0010] As a further embodiment of this utility model: the insulating coating covers the four sides and the bottom of the aluminum shell of the battery cell.

[0011] The insulating coating of this invention is applied to the entire outer side of the aluminum casing of the battery cell, providing insulation and protection for the aluminum casing.

[0012] As a further embodiment of this invention, the insulating coating is a UV coating.

[0013] As a further embodiment of this utility model: a winding core is installed inside the aluminum shell of the battery cell, and a top cover plate connected to the winding core is provided on the top of the aluminum shell of the battery cell.

[0014] As a further embodiment of this utility model: several recesses or protrusions located at the bottom of the aluminum shell of the battery cell are arranged in a matrix.

[0015] The present invention employs a matrix arrangement of several recessed or protruding portions, which facilitates the forming of the aluminum shell of the battery cell.

[0016] As a further embodiment of this utility model, the recessed portion or the protruding portion may be in the shape of a rectangle, triangle, circle or polygon.

[0017] As a further embodiment of this utility model: the recessed portion or the protruding portion may be a combination of several shapes such as rectangle, triangle, circle or polygon.

[0018] This utility model also discloses a battery module, including several battery cell bodies, with a liquid cooling plate integrally arranged below the several battery cell bodies.

[0019] This utility model also discloses a battery pack, including at least two sets of the aforementioned battery modules. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the structure of a battery cell according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the structure of the battery cell body according to an embodiment of the present invention;

[0022] Figure 3 is an exploded view of the battery cell body according to an embodiment of the present invention;

[0023] Figure 4 is a cross-sectional view of the battery cell body according to an embodiment of the present invention;

[0024] Figure 5 is an enlarged view of area A in Figure 4;

[0025] Figure 6 is a schematic diagram of the battery cell body before and after adhesive bonding in an embodiment of this utility model;

[0026] Figure 7 is a plan view of the insulating coating after it is applied to the aluminum shell of the battery cell according to an embodiment of the present invention;

[0027] Figure 8 is a schematic diagram of the bottom surface of the aluminum shell of the battery cell in an embodiment of this utility model;

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Battery cell body; 2. Thermally conductive structural adhesive; 3. Liquid cooling plate;

[0030] 101. Aluminum casing of battery cell; 102. Insulating coating; 103. Top cover plate; 104. Core. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] Example 1

[0033] Referring to Figure 1, a battery cell includes a battery cell body 1 and a liquid cooling plate 3 installed below the battery cell body 1. A thermally conductive structural adhesive 2 is provided between the battery cell body 1 and the liquid cooling plate 3, and the battery cell body 1 is bonded and fixed to the liquid cooling plate 3 by the thermally conductive structural adhesive 2.

[0034] Referring to Figures 2 and 3, the battery cell body 1 includes a battery cell aluminum shell 101, an insulating coating 102, an upper cover plate 103, and a core 104; the core 104 is installed inside the battery cell aluminum shell 101, the upper cover plate 103 is installed on the top of the battery cell aluminum shell 101, the upper cover plate 103 is connected to the core 104, and the insulating coating 102 is coated on the outside of the battery cell aluminum shell 101.

[0035] Referring to Figure 3, the aluminum shell 101 of the battery cell is a rectangular shell structure with an opening at the top. The upper cover plate 103 is installed at the top opening of the aluminum shell 101 of the battery cell and seals it. Several protrusions or recesses are provided at the bottom of the aluminum shell 101 of the battery cell.

[0036] Several protrusions or depressions are arranged in a matrix or in a circular pattern. The depressions or protrusions can be rectangular, triangular, circular or polygonal in shape.

[0037] Alternatively, the recessed or raised portion can be a combination of several shapes, such as rectangles, triangles, circles, or polygons.

[0038] It should be noted that this application does not limit the specific number, shape, or arrangement of the recesses or protrusions, but only provides optional methods, which shall be determined according to the actual situation.

[0039] Referring to Figures 5 and 7, the insulating coating 102 is applied to the outside and bottom of the aluminum shell 101 of the battery cell, and also completely covers the protrusions or depressions on the bottom. After the insulating coating is applied to the aluminum shell 101 of the battery cell, the depressions or protrusions on the bottom of the aluminum shell 101 of the battery cell are still clearly visible. The insulating coating 102 does not affect the characteristics of the bottom of the aluminum shell 101 of the battery cell.

[0040] Furthermore, the insulating coating 102 can be any coating that can produce insulation, such as UV coating; the insulating coating 102 is applied by spraying, impregnation or other methods, and this application does not limit the application, but only provides two possible implementation methods.

[0041] It should be noted that the concave or convex features at the bottom of the cell body 1 can increase the contact area between the cell body 1 and the thermally conductive structural adhesive 2. At the same time, when the battery pack is subjected to vibration or impact, horizontal pull-out force and vertical shear force can be generated between the cell body 1 and the thermally conductive structural adhesive 2, which improves the reliability of the bonding between the cell body 1 and the liquid cooling plate 3.

[0042] Example 2

[0043] A battery module includes several sets of battery cell bodies 1 as described in Embodiment 1. A liquid cooling plate 3 is integrally arranged below several battery cell bodies 1, which can realize that one liquid cooling plate can simultaneously exchange heat for all battery cell bodies 1.

[0044] Example 3

[0045] A battery pack includes at least two types of battery modules as described in Embodiment 2, all of which are installed inside the battery pack housing.

[0046] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell, comprising a cell body (1) and a liquid cooling plate (3) located below the cell body (1), characterized in that, A thermally conductive structural adhesive (2) is provided between the battery cell body (1) and the liquid cooling plate (3). The battery cell body (1) includes a battery cell aluminum shell (101), and the bottom of the battery cell aluminum shell (101) is provided with several recesses or protrusions.

2. The battery cell according to claim 1, characterized in that: The aluminum casing (101) of the battery cell is covered with an insulating coating (102).

3. A battery cell according to claim 2, characterized in that: The insulating coating (102) covers the four sides and bottom of the aluminum shell (101) of the battery cell.

4. A battery cell according to claim 2, characterized in that: The insulating coating (102) is a UV coating.

5. A battery cell according to claim 1, characterized in that: The battery cell aluminum shell (101) has a core (104) installed inside, and the top of the battery cell aluminum shell (101) is provided with an upper cover plate (103) connected to the core (104).

6. A battery cell according to claim 1, characterized in that: Several recesses or protrusions located at the bottom of the aluminum shell (101) of the battery cell are arranged in a matrix.

7. A battery cell according to claim 6, characterized in that: The recessed or protruding portion may be in one of the following shapes: rectangular, triangular, circular, or polygonal.

8. A battery cell according to claim 6, characterized in that: The recessed or protruding portion may be a combination of several shapes, such as rectangle, triangle, circle, or polygon.

9. A battery module, characterized in that, It includes several cell bodies (1) as described in any one of claims 1-8, and the liquid cooling plate (3) is integrally arranged below the several cell bodies (1).

10. A battery pack, characterized in that, It includes at least two sets of battery modules as described in claim 9.

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