Battery fixing assembly and vehicle

Abstract

The utility model provides a battery fixing assembly which comprises a middle plate and a cover body, and the cover body is located on the outer side of the middle plate. Wherein the cover body is provided with a plurality of concave parts, and the concave parts are formed in the mode that the outer side surface of the cover body protrudes inwards towards the middle plate; the middle plate is provided with a plurality of through holes, the through holes penetrate in the protruding direction of the concave parts, and the concave parts are clamped and fixed to the wall portions of the through holes in the through holes. According to the battery fixing assembly, the cover body is ingeniously and stably fixed, the production process and the installation process of components are extremely simple, and meanwhile effective water prevention can be achieved. The utility model further provides a vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery fixing assembly and a vehicle. Background Art

[0002] There are usually two types of upper covers for battery modules of existing electric vehicles: one is to use the upper cover and the insulating plate to be clamped and fixed by the bosses and protrusions facing each other, or to use a snap-on structure to clamp and fix, which has the disadvantages of occupying height space, reducing the energy density of the battery module, or causing the battery module to expand too much during the charge and discharge cycle, or causing the upper cover to be difficult to disassemble, and the component production cost is high; the other is to use additional snaps to connect the upper cover, which requires too many additional parts, and the installation process is complicated, which is not conducive to automated operation, the cost is high, and it is not waterproof. When water is splashed, water may enter the battery module and cause the high voltage short circuit of the battery module, thereby causing the risk of fire and explosion.

[0003] Therefore, it is necessary to provide an improved battery fixing assembly to overcome or reduce at least part of the disadvantages existing in the above-mentioned prior art. Utility Model Content

[0004] In the first aspect of the utility model, a battery fixing assembly is provided, which includes an intermediate plate and a cover body, wherein the cover body is located on the outer side of the intermediate plate; wherein the cover body has a plurality of recessed portions, and the recessed portions are formed by the outer surface of the cover body protruding inward toward the intermediate plate; the intermediate plate has a plurality of through holes, which pass through in the protruding direction of the recessed portions, and the recessed portions are clamped and fixed with the wall portions of the through holes in the through holes.

[0005] Optionally, the cover body is located above the middle plate, the recessed portion is formed by the top surface of the cover body protruding downward, and the through hole penetrates in the up and down directions.

[0006] Optionally, the middle plate is a bus bar support plate, the bus bar support plate covers the top surface of the battery cell, and the bus bar is arranged at the bus bar support plate to electrically connect the battery cell.

[0007] Optionally, the size of the outer opening of the through hole is smaller than the maximum cross-sectional size of the recessed portion; and / or

[0008] The inner side surface of the recessed portion does not extend beyond the inner side surface of the intermediate plate.

[0009] Optionally, the recessed portion includes a recessed bottom and a circumferential wall portion, wherein the circumferential wall portion extends obliquely outward from an edge of the recessed bottom and toward a central axis of the recessed portion.

[0010] Optionally, the wall of the through hole extends obliquely from outside to inside away from the central axis of the through hole.

[0011] Optionally, the angle between the circumferential wall portion and the central axis of the recessed portion is 1° to 3°; and / or

[0012] The angle between the wall of the through hole and the central axis of the through hole is 1° to 3°.

[0013] Optionally, the intersection of the recessed bottom and the circumferential wall portion is rounded; and / or

[0014] The wall of the through hole is rounded at the outer opening.

[0015] Optionally, the thickness of the cover does not exceed 0.5 mm.

[0016] In a second aspect of the present invention, a vehicle is provided, the vehicle comprising:

[0017] a plurality of battery cells; and

[0018] The battery fixing assembly mentioned above is located outside the plurality of battery cells.

[0019] The battery fixing assembly of the utility model forms a plurality of recessed portions on the cover body and a plurality of through holes on the middle plate, so that the recessed portions are clamped and fixed with the walls of the through holes in the through holes, thereby cleverly realizing the stable fixation of the cover body. The production process and the installation process of the components are extremely simple, which is convenient for automated production, and does not require additional fixing components, so the cost is low. At the same time, it can achieve effective waterproofing, and there will be no problem of water entering the battery cells covered by the cover body and causing fire and explosion.

[0020] Based on the detailed description of the specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Features, advantages and exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals indicate like elements, and in which:

[0022] Figure 1 It is a three-dimensional schematic diagram of a battery fixing assembly according to an embodiment of the utility model.

[0023] Figure 2 is along Figure 1 Partial cross-sectional view along line AA.

[0024] Figure 3 Is has Figure 1 Schematic diagram of the exploded view of the battery module with the battery fixing assembly.

[0025] Figure 4 is along Figure 3 Partial cross-sectional view along line BB.

[0026] Figure 5 is along Figure 3 Partial cross-sectional view along the CC line. DETAILED DESCRIPTION

[0027] The following is a detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. The description of the exemplary embodiments is merely exemplary and is by no means a limitation of the present invention and its application or usage. Moreover, the sizes and proportions of the components in the drawings are merely schematic and do not strictly correspond to the actual product.

[0028] The utility model provides a battery fixing assembly 100, which includes an intermediate plate 300 and a cover body 400, wherein the cover body 400 is located on the outer side of the intermediate plate 300; wherein the cover body 400 has a plurality of recessed portions 401, wherein the recessed portions 401 are formed by the outer surface of the cover body 400 protruding inwardly toward the intermediate plate 300; the intermediate plate 300 has a plurality of through holes 301, wherein the through holes 301 penetrate in the protruding direction of the recessed portions 401, and the recessed portions 401 are clamped and fixed with the wall of the through holes 301 in the through holes 301. The battery fixing assembly 100 of the embodiment of the utility model forms a plurality of recessed portions 401 on the cover 400 and a plurality of through holes 301 on the middle plate 300, so that the recessed portions 401 are fixedly engaged with the wall of the through hole 301 in the through hole 301, and the cover 400 can be fixed firmly. The production process and installation process of the components are extremely simple, which is convenient for automated production, and no additional fixing components are required, which is low in cost. At the same time, since the recessed portions 401 are directly formed by protruding the outer surface of the cover 400 inward, the cover 400 itself has no gaps, which can achieve effective waterproof and dustproof, and there will be no problem of water entering the battery cell 200 covered by the cover 400 and causing fire and explosion. When the cover 400 and the middle plate 300 need to be disassembled, only an outward pulling force needs to be applied to the cover 400, and the recessed portions 401 are removed from the through hole 301. This disassembly method will not damage the structure of the cover 400 or the middle plate 300, and the disassembly and assembly are convenient and simple.

[0029] The embodiment of the present invention further provides a vehicle, which has a plurality of battery cells 200 and the aforementioned battery fixing assembly 100, wherein the battery fixing assembly 100 is located outside the plurality of battery cells 200. The vehicle is generally an electric vehicle.

[0030] When the battery fixing assembly 100 of the embodiment of the utility model is used in a vehicle, it can be used in a conventional battery module, and multiple battery modules are assembled to form a battery pack, and the battery pack is installed in the vehicle; it can also be used for CTP (cell to package) and CTC (cell to chassis) instead of in a battery module. The structural composition of the battery cell 200 can be any structure of the battery cell 200 in the prior art, and can generally include a shell and a cell core, and the cell core is arranged inside the shell. The battery cell 200 can be a square battery cell or a cylindrical battery cell. The shell is usually a metal shell, such as an aluminum shell.

[0031] The battery fixing assembly 100 of the embodiment of the utility model has passed the 90G impact test, the 150G impact test, the vibration + 50G impact test, and the IPXXB test.

[0032] The composition of the battery fixing assembly 100 of the embodiment of the utility model will be described in more detail below in conjunction with the accompanying drawings. In the example, the battery fixing assembly 100 of the embodiment of the utility model is used in a battery module. In this article, "multiple" means two or more. In this article, "outside" and "inside" are relative to the position of the battery cell, and the one far away from the battery cell is outside, and the one close to the battery cell is inside.

[0033] The battery fixing assembly 100 of the embodiment of the utility model is usually placed above a plurality of battery cells 200 to cover the battery cells 200. Figure 3 As shown. Thus, the middle plate 300 is located above the plurality of battery cells 200, and the cover 400 is located above the middle plate 300; the recessed portion 401 is formed by the top surface of the cover 400 protruding downward; the through hole 301 penetrates in the up-down direction, and the recessed portion 401 is fixedly engaged with the wall of the through hole 301 in the through hole 301.

[0034] The cover body 400 of the battery module of the embodiment of the utility model has a plurality of recessed portions 401, for example, the cover body 400 may have 2 recessed portions 401, 4 recessed portions 401, or 9 recessed portions 401. The middle plate 300 has a plurality of through holes 301, for example, the middle plate 300 may have 2 through holes 301, 4 through holes 301, or 9 through holes 301. By providing a plurality of recessed portions 401 and a plurality of through holes 301 to be mutually engaged, a firm fixation of the cover body 400 can be achieved. Usually, the number of through holes 301 of the middle plate 300 is consistent with the number of recessed portions 401 of the cover body 400, that is, one recessed portion 401 corresponds to one through hole 301. Usually, the number of recessed portions 401 and through holes 301 does not exceed 9 to prevent excessive force required for disassembly. It can be understood that the number of through holes 301 may also be more than the number of recessed portions 401. For example Figures 1 to 3As shown, in the battery module of the embodiment of the utility model, the cover 400 has 9 recessed portions 401, which are roughly arranged in a grid and evenly distributed over the entire area of ​​the cover 400. Correspondingly, the middle plate 300 has 9 through holes 301, which are roughly arranged in a grid and evenly distributed over the entire area of ​​the middle plate 300.

[0035] In some embodiments, the middle plate 300 is a busbar support plate 302, the busbar support plate 302 covers the top surface of the battery cell 200, and the busbar 303 is arranged at the busbar support plate 302 to electrically connect the battery cell 200. By using the busbar support plate 302 as the middle plate 300, it is not necessary to set up additional other plates, and at the same time, it can not affect the occupied height space of the battery module, and ensure the energy density of the battery module. In addition, the busbar support plate 302 of the battery module has high strength, which can press the NTC temperature sensor, etc., and there is no need to design additional components to press the NTC temperature sensor. Therefore, the utilization rate of the height space of the battery module is greatly improved, which can further improve the energy density of the battery module or improve the life of the battery module. Usually, the busbar support plate 302 is provided with a busbar hole (not shown in the figure) for connecting the busbar 303 and the battery cell 200 at a position close to the front and rear edges. Thus, the busbar 303 arranged above the busbar support plate 302 can be electrically connected to the battery cell 200 through the busbar hole. Figure 3 Only some components of the battery module are shown in the figure, and the busbar support plate 302 is a high-voltage busbar support plate 302 of the battery module. It can be understood that the battery module can also include other conventional components, such as end plates, side plates, bottom plates, etc.

[0036] The thickness of the cover 400 in the vertical direction may not exceed 0.5 mm. For example, the thickness of the cover 400 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. By using the ultra-thin cover 400, the height space occupied by the battery module can be reduced and the energy density of the battery module can be improved. The cover 400 is generally square in shape and may include a cover body and edges extending downward from four edges of the cover body. The cover 400 may also be other shapes.

[0037] The cover body 400 and the busbar support plate 302 can be produced by any process in the art that can produce the cover body 400 and the busbar support plate 302. Usually, the cover body 400 and the recessed portion 401 can be formed by a vacuum forming process, thereby making the production and processing of the cover body 400 and the recessed portion 401 simpler and convenient for automated production. The busbar support plate 302 can be formed by injection molding, thereby making the production and processing of the busbar support plate 302 and the through hole 301 simpler and convenient for automated production. The improved cover body 400 and busbar support plate 302 of the embodiment of the utility model will not affect the design of other components in the battery module.

[0038] In some embodiments, the size of the outer opening of the through hole 301 is smaller than the maximum cross-sectional size of the recessed portion 401. Figure 2 For example, in this cross-sectional view, the left-right width of the upper opening of the through hole 301 is smaller than the maximum left-right width of the recessed portion 401. By setting the size of the outer opening of the through hole 301 to be smaller than the maximum cross-sectional size of the recessed portion 401, after the recessed portion 401 is inserted into the through hole 301, the recessed portion 401 will not fall out of the through hole 301. Generally, the size of the outer opening of the through hole 301 is slightly smaller than the maximum cross-sectional size of the recessed portion 401, thereby ensuring that the clamping is stable and the clamping process is smooth and efficient.

[0039] The inner side surface of the recessed portion 401 may not exceed the inner side surface of the middle plate 300. Figure 2 For example, the bottom surface of the recessed portion 401 is not lower than the bottom surface of the middle plate 300. In other words, the upper and lower heights of the recessed portion 401 are not greater than the upper and lower heights of the through hole 301 of the middle plate 300. By setting the inner surface of the recessed portion 401 not to exceed the inner surface of the middle plate 300, the occupied space of the battery module is not affected while ensuring that the production process and the installation process are extremely simple, and the battery module has a high energy density. At the same time, the setting of the recessed portion 401 does not affect other components on the inner side of the middle plate 300. Usually, the inner surface of the recessed portion 401 is roughly flush with the inner surface of the middle plate 300, which can increase the contact area between the recessed portion 401 and the through hole 301 as much as possible without affecting the occupied space and other components, thereby further ensuring a stable clamping connection.

[0040] refer to Figure 2 and Figure 4 The recessed portion 401 includes a recessed bottom 411 and a circumferential wall portion 412, and the circumferential wall portion 412 extends outward from the edge of the recessed bottom 411 and obliquely toward the central axis of the recessed portion 401. The longitudinal section of the recessed portion 401 may have a substantially trapezoidal shape. Figure 4 The central axis of the recessed portion 401 is also shown. The inclination angle of the circumferential wall portion 412 of the recessed portion 401 mainly depends on the processing capability of the manufacturer of the blister processing cover body 400. The inclination angle of the circumferential wall portion 412 needs to ensure normal demolding during blister processing. In some embodiments, the angle α between the circumferential wall portion 412 and the central axis of the recessed portion 401 can be 1° to 3°. For example, the angle α between the circumferential wall portion 412 and the central axis of the recessed portion 401 is 1°, 2°, or 3°.

[0041] In some embodiments, the wall of the through hole 301 extends obliquely from the outside to the inside away from the central axis of the through hole 301. Figure 2 and Figure 5 , the wall of the through hole 301 extends obliquely from top to bottom away from the central axis of the through hole 301. The longitudinal section of the through hole 301 may have a substantially trapezoidal shape. Figure 5 The central axis of the through hole 301 is also shown. By setting the wall of the through hole 301 to extend obliquely from the outside to the inside away from the central axis of the through hole 301, the clamping of the recessed portion 401 and the through hole 301 is more stable, and the recessed portion 401 is not easy to escape from the through hole 301. The angle β between the wall of the through hole 301 and the central axis of the through hole 301 can be 1° to 3°. For example, the angle β between the wall of the through hole 301 and the central axis of the through hole 301 is 1°, 2°, and 3°. The inclination angle of the wall of the through hole 301 is usually slightly larger than the inclination angle of the circumferential wall 412, so as to ensure that the clamping process is smooth and efficient while ensuring a stable clamping.

[0042] Continue to refer Figure 4 and Figure 5 The intersection of the recessed bottom 411 and the circumferential wall 412 forms a rounded shape 500, and the wall of the through hole 301 forms a rounded shape 500 at the outer opening. By forming the rounded shape 500 at the intersection of the recessed bottom 411 and the circumferential wall 412 and the outer opening of the wall of the through hole 301, the recessed portion 401 can be smoothly inserted into the through hole 301. The intersection of the circumferential wall 412 and the portion of the cover 400 surrounding the recessed portion 401 can also form a rounded shape 500.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "an example", "some examples", or "preferred embodiments" etc. 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 utility model. 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.

[0044] The embodiments of the present invention are described in detail above. However, aspects of the present invention are not limited to the above embodiments. Various modifications and substitutions may be applied to the above embodiments without departing from the scope of the present invention.

Claims

1. A battery fixing assembly, characterized in that: The battery fixing assembly includes an intermediate plate and a cover body, wherein the cover body is located on the outer side of the intermediate plate; wherein the cover body has a plurality of recessed portions, wherein the recessed portions are formed by the outer surface of the cover body protruding inward toward the intermediate plate; the intermediate plate has a plurality of through holes, wherein the through holes pass through in the protruding direction of the recessed portions, and the recessed portions are clamped and fixed to the wall portions of the through holes in the through holes.

2. The battery fixing assembly according to claim 1, characterized in that: The cover body is located above the middle plate, the recessed portion is formed by the top surface of the cover body protruding downward, and the through hole penetrates in the up-down direction.

3. The battery fixing assembly according to claim 2, characterized in that: The intermediate plate is a bus bar support plate that covers the top surface of the battery cells, and bus bars are disposed at the bus bar support plate to electrically connect the battery cells.

4. The battery fixing assembly according to claim 1 or 2, characterized in that: The size of the outer opening of the through hole is smaller than the maximum cross-sectional size of the recessed portion; and / or An inner side surface of the recessed portion does not extend beyond an inner side surface of the middle plate.

5. The battery fixing assembly according to claim 1 or 2, characterized in that: The recessed portion includes a recessed bottom and a circumferential wall portion, wherein the circumferential wall portion extends obliquely outward from an edge of the recessed bottom and toward a central axis of the recessed portion.

6. The battery fixing assembly according to claim 5, characterized in that: The wall of the through hole extends obliquely from outside to inside away from the central axis of the through hole.

7. The battery fixing assembly according to claim 6, characterized in that: The angle between the circumferential wall and the central axis of the recessed portion is 1° to 3°; and / or The angle between the wall of the through hole and the central axis of the through hole is 1° to 3°.

8. The battery fixing assembly according to claim 5, characterized in that: The intersection of the recessed bottom and the circumferential wall portion is rounded; and / or The wall portion of the through hole is rounded at the outer opening.

9. The battery fixing assembly according to claim 1 or 2, characterized in that: The thickness of the cover body does not exceed 0.5 mm.

10. A vehicle, characterized in that: The vehicle comprises: a plurality of battery cells; and The battery fixing assembly according to any one of claims 1-9, wherein the battery fixing assembly is located outside the plurality of battery cells.

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