Battery cover plate assembly and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate assembly and a battery monomer. The battery cover plate assembly comprises a cover plate sheet, lower plastic and a bracket assembly, the lower plastic cement is attached to one side, close to the battery cell, of the cover plate sheet; the bracket assembly is embedded in the lower plastic cement. The side, away from the battery cell, of the support assembly abuts against the cover plate piece, and the side, close to the battery cell, of the support assembly can abut against the battery cell. The lower plastic and the support assembly are made of insulating materials, the material melting point of the support assembly is larger than that of the lower plastic, the support assembly can support the battery cell after the lower plastic is softened and melted at high temperature, the battery cell is prevented from directly making contact with the cover plate piece after falling, and then the thermal runaway process of the battery cell is prevented from being aggravated. The single battery comprises a battery cell, a shell and the battery cover plate assembly, the battery cell is located in the shell, the cover plate assembly covers the opening of the shell, and the single battery is high in safety performance.

Description

Technical Field

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

[0002] Power batteries are widely used in electric vehicles, energy storage, aerospace, and other fields, and their safety is becoming increasingly prominent. To improve the safety of power batteries, inverted cell assembly technology is commonly used. For example, in the field of electric vehicles, inverted cell assembly technology allows the high-pressure, high-temperature gas flow generated by thermal runaway in a cell to quickly release heat and pressure downwards through a pressure relief valve along the bottom exhaust channel in extreme situations, thereby maximizing the safety of the upper passenger compartment.

[0003] However, in the actual assembly of power batteries, the lower insulating plastic inside the cell is generally made of PP material because it needs to be welded to the cell's protective film. But PP material has a low melting point. Before the cell experiences thermal runaway, the lower insulating plastic softens or even melts when heated. The inverted cell, due to gravity, falls and directly contacts the top cover, thus exacerbating the cell's runaway process and posing a certain safety risk.

[0004] Therefore, there is an urgent need to propose a battery cover assembly and a battery cell to solve the above problems. Utility Model Content

[0005] The first objective of this utility model is to provide a battery cover assembly, wherein the support component of the battery cover assembly can support the battery cell after the lower plastic has softened and melted at high temperature, so as to prevent the battery cell from falling and directly contacting the cover plate, thereby preventing the thermal runaway process of the battery cell from being aggravated.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Battery cover assembly, including:

[0008] Cover plate;

[0009] The lower plastic is attached to the cover plate on the side near the battery cell.

[0010] A bracket assembly is embedded in the lower plastic, and the side of the bracket assembly facing away from the battery cell abuts against the cover plate, while the side of the bracket assembly close to the battery cell abuts against the battery cell. The melting point of the material of the bracket assembly is greater than that of the material of the lower plastic.

[0011] As an optional technical solution for the battery cover assembly, the bracket assembly includes two bracket blocks, which are arranged opposite each other along the length direction of the lower plastic and extend along the width direction of the lower plastic.

[0012] As an optional technical solution for the battery cover assembly, the lower plastic has mounting grooves at both ends along its length, the shape of the mounting grooves being adapted to the shape of the bracket block, and the bracket block being able to be embedded in the mounting grooves.

[0013] As an optional technical solution for the battery cover assembly, the support block includes a block body and a surrounding edge. The surrounding edge extends circumferentially along the block body and is arranged in a closed loop. The mounting groove includes a first groove and a second groove that are connected vertically. The first groove is located on the side of the lower plastic away from the battery cell, and the second groove is located on the side of the lower plastic close to the battery cell. The surrounding edge is embedded in the first groove, and the block body is embedded in the second groove.

[0014] As an optional technical solution for the battery cover assembly, the block has a groove on the side opposite to the battery cell.

[0015] As an optional technical solution for the battery cover assembly, the bottom of the groove is provided with multiple through holes.

[0016] As an optional technical solution for the battery cover assembly, the plurality of through holes are evenly spaced at the bottom of the groove.

[0017] As an optional technical solution for the battery cover assembly, the lower plastic sheet has a locking post on the side near the cover plate, and the cover plate has a locking groove on the side near the lower plastic sheet, with the locking post locking into the locking groove.

[0018] As an optional technical solution for the battery cover assembly, there are multiple locking posts and multiple locking slots, with each locking post corresponding to a locking slot, and the multiple locking posts are spaced apart along the circumferential direction of the lower plastic.

[0019] The second objective of this invention is to provide a battery cell with high safety performance.

[0020] To achieve this objective, the present invention adopts the following technical solution:

[0021] A battery cell includes a battery cell, a housing, and the aforementioned battery cover assembly, wherein the battery cell is located inside the housing, and the cover assembly covers the opening of the housing.

[0022] The beneficial effects of this utility model are:

[0023] The battery cover assembly provided by this utility model includes a cover sheet, a lower plastic layer, and a support assembly. The lower plastic layer is attached to the cover sheet, insulating and isolating the cover sheet and the battery cell. The support assembly is embedded in the lower plastic layer and abuts against the cover sheet and the battery cell on both sides, insulating and isolating the cover sheet and the battery cell together with the lower plastic layer. The melting point of the material of the support assembly is higher than that of the material of the lower plastic layer. This allows the support assembly to still support the battery cell even after the lower plastic layer softens and melts due to high temperature before the inverted battery cell experiences thermal runaway, preventing the battery cell from directly contacting the cover sheet after falling, thereby preventing the thermal runaway process of the battery cell from being aggravated. Attached Figure Description

[0024] Figure 1 This is an exploded view of the battery cover assembly provided in this embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the assembly of the lower plastic and the support block in the battery cover assembly provided in this embodiment of the utility model. Figure 1 ;

[0026] Figure 3 This is a schematic diagram of the assembly of the lower plastic and the support block in the battery cover assembly provided in this embodiment of the utility model. Figure 2 ;

[0027] Figure 4 This is a schematic diagram of the support block in the battery cover assembly provided in this embodiment of the utility model.

[0028] In the picture:

[0029] 100, cover plate; 200, lower plastic; 210, mounting groove; 220, locking post; 300, bracket block; 310, block; 311, groove; 312, through hole; 320, edging. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] The battery cover assembly provided in this embodiment has a support assembly that can support the battery cell after the lower plastic has softened and melted at high temperature, so as to prevent the battery cell from falling and directly contacting the cover plate, thereby preventing the thermal runaway process of the battery cell from being aggravated.

[0035] Specifically, such as Figures 1 to 4 As shown, the battery cover assembly includes a cover plate 100, a lower plastic 200, and a support assembly. The lower plastic 200 is attached to the cover plate 100 near the battery cell, and the support assembly is embedded in the lower plastic 200. The support assembly abuts against the cover plate 100 on the side away from the battery cell, and the side of the support assembly near the battery cell can abut against the battery cell. Both the lower plastic 200 and the support assembly are made of insulating material, and the melting point of the material in the support assembly is greater than that of the material in the lower plastic 200. For example, the support assembly can be made of a high-temperature resistant insulating material such as ceramic.

[0036] Based on the above design, the lower plastic 200 is attached to the cover plate 100, insulating and isolating the cover plate 100 and the battery cell. The support assembly is embedded in the lower plastic 200, and its two sides abut against the cover plate 100 and the battery cell, working together with the lower plastic 200 to insulate and isolate the cover plate 100 and the battery cell. The melting point of the support assembly material is higher than that of the lower plastic 200 material, so that even after the lower plastic 200 softens and melts due to high temperature before the inverted battery cell experiences thermal runaway, the support assembly can still support the battery cell, preventing it from directly contacting the cover plate 100 after falling, thereby preventing the thermal runaway process from escalating.

[0037] Furthermore, the support assembly includes two support blocks 300, which are arranged opposite each other along the length of the lower plastic 200 and extend along the width of the lower plastic 200. The two support blocks 300 are located at both ends along the length of the lower plastic 200. In the case of an excessively long cover plate 100, this prevents the battery cell from contacting the cover plate 100 at a distance from the support assembly after the lower plastic 200 melts. The extension of the support blocks 300 along the width of the lower plastic 200 increases the support effect on the battery cell.

[0038] In order to better fix the bracket block 300, the lower plastic 200 is provided with mounting grooves 210 at both ends along the length direction. The shape of the mounting grooves 210 is adapted to the shape of the bracket block 300, and the bracket block 300 can be embedded in the mounting grooves 210.

[0039] It should be noted that the mounting slot 210 is positioned to avoid the area where the cell protective film is welded.

[0040] Optionally, continue as follows Figure 4 As shown, the bracket block 300 includes a block body 310 and a surrounding edge 320. The surrounding edge 320 extends circumferentially along the block body 310 and is arranged in a closed loop. The mounting groove 210 includes a first groove and a second groove that are connected vertically. The first groove is located on the side of the lower plastic 200 away from the battery cell, and the second groove is located on the side of the lower plastic 200 close to the battery cell. The surrounding edge 320 is embedded in the first groove, and the block body 310 is embedded in the second groove, which increases the connection strength between the bracket block 300 and the lower plastic 200.

[0041] Furthermore, the block 310 has a groove 311 on the side opposite to the battery cell, which can save materials and reduce the weight of the support assembly.

[0042] To further save materials and reduce weight, the bottom of the groove 311 is provided with multiple through holes 312.

[0043] Continue as Figure 3 and Figure 4 As shown, multiple through holes 312 are evenly spaced at the bottom of the groove 311.

[0044] To increase the connection strength between the cover plate 100 and the lower plastic 200, the lower plastic 200 is provided with a locking post 220 on the side near the cover plate 100, and the cover plate 100 is provided with a locking groove on the side near the lower plastic 200, with the locking post 220 locked in the locking groove.

[0045] Furthermore, there are multiple card posts 220 and card slots, with each card post 220 corresponding to a card slot, and multiple card posts 220 are spaced apart circumferentially along the lower plastic 200.

[0046] The battery cover assembly also includes a positive terminal and a negative terminal, which are arranged opposite to each other along the length of the cover plate 100 and are connected to the cover plate 100 and the lower plastic 200.

[0047] It should be noted that in this embodiment, the two support blocks 300 are located on the outer side of the positive and negative terminals along the length of the lower plastic 200, respectively.

[0048] This embodiment also provides a battery cell with high safety performance.

[0049] The battery cell includes a battery cell, a casing, and the aforementioned battery cover assembly. The battery cell is located inside the casing, and the cover assembly covers the opening in the casing. Because the battery cover assembly of the battery cell includes a support assembly, even after the plastic 200 softens and melts before the inverted battery cell experiences thermal runaway, the support assembly can still support the battery cell, preventing the battery cell from directly contacting the cover plate 100 after it falls. This avoids exacerbating the thermal runaway process of the battery cell and improves the safety performance of the battery cell.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery cover assembly, characterized in that, include: Cover plate (100); The lower plastic (200) is attached to the cover plate (100) on the side near the battery cell; A bracket assembly is embedded in the lower plastic (200), and the bracket assembly abuts against the cover plate (100) on the side away from the battery cell, and the bracket assembly can abut against the battery cell on the side close to the battery cell. The melting point of the material of the bracket assembly is greater than the melting point of the material of the lower plastic (200).

2. The battery cover assembly according to claim 1, characterized in that, The bracket assembly includes two bracket blocks (300), which are arranged opposite each other along the length direction of the lower plastic (200) and extend along the width direction of the lower plastic (200).

3. The battery cover assembly according to claim 2, characterized in that, The lower plastic (200) has mounting grooves (210) at both ends along its length. The shape of the mounting grooves (210) is adapted to the shape of the bracket block (300), and the bracket block (300) can be embedded in the mounting grooves (210).

4. The battery cover assembly according to claim 3, characterized in that, The support block (300) includes a block (310) and a surrounding edge (320). The surrounding edge (320) extends circumferentially along the block (310) and is arranged in a closed loop. The mounting groove (210) includes a first groove and a second groove that are connected vertically. The first groove is located on the side of the lower plastic (200) away from the battery cell, and the second groove is located on the side of the lower plastic (200) close to the battery cell. The surrounding edge (320) is embedded in the first groove, and the block (310) is embedded in the second groove.

5. The battery cover assembly according to claim 4, characterized in that, The block (310) has a groove (311) on the side opposite to the battery cell.

6. The battery cover assembly according to claim 5, characterized in that, The bottom of the groove (311) is provided with multiple through holes (312).

7. The battery cover assembly according to claim 6, characterized in that, The plurality of through holes (312) are evenly spaced at the bottom of the groove (311).

8. The battery cover assembly according to claim 1, characterized in that, The lower plastic (200) has a locking post (220) on the side near the cover plate (100), and the cover plate (100) has a locking groove on the side near the lower plastic (200), and the locking post (220) is locked in the locking groove.

9. The battery cover assembly according to claim 8, characterized in that, There are multiple card posts (220) and multiple card slots. Each card post (220) corresponds to a card slot. Multiple card posts (220) are spaced apart around the lower plastic (200).

10. A single battery cell, characterized in that, The battery includes a battery cell, a housing, and a battery cover assembly as described in any one of claims 1-9, wherein the battery cell is located inside the housing, and the cover assembly covers the opening of the housing.

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