Lower plastic plate, top cover assembly, and battery

Abstract

A lower plastic plate, a top cover assembly, and a battery. The lower plastic plate comprises a plastic plate body (1) and a connecting unit. The plastic plate body (1) comprises a first plastic sub-plate (11) and a second plastic sub-plate (12) which are separated. The first plastic sub-plate (11) is provided with a first pole hole (111), and the second plastic sub-plate (12) is provided with a second pole hole (121). The connecting unit comprises a connecting plate (21) and a snap-fitting member (22). The connecting plate (21) is connected to one of the first plastic sub-plate (11) and the second plastic sub-plate (12), and the snap-fitting member (22) is connected to the other one of the first plastic sub-plate (11) and the second plastic sub-plate (12). The connecting plate (21) is provided with a limiting hole (211), and the snap-fitting member (22) is slidably snap-fitted into the limiting hole (211) in the length direction of the plastic plate body (1).

Description

Lower plastic plate, top cover assembly and battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 12, 2024, with application number 202420077856.8, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of power batteries, for example, to a lower plastic plate, a top cover assembly and a battery. Background Art

[0003] Currently, green and efficient secondary batteries are being vigorously developed. As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and environmental protection. They have broad application prospects in portable appliances, power tools, large-scale energy storage, and electric transportation power supply. Power batteries generally include a top cover, battery cells, shell, and lower plastic structure. The battery cells are fixed in the shell. The electrode sheets extend from the top of the battery cells and connect to the poles fixed on the top cover. The lower plastic is installed under the top cover, and the top cover and battery cells are insulated by the lower plastic. During assembly, the positive and negative electrode tabs are first welded to the poles, and then the battery cells are placed in the shell and the battery top cover is installed.

[0004] The lower plastic is provided with through-holes corresponding to the top cover, for the positive and negative terminals to pass through. The lower plastic and top cover are fixedly connected by riveting or encapsulating the terminals. However, the lower plastic shrinks during cooling and solidification. Furthermore, the temperature rise during the injection molding or riveting of the terminal structure also causes thermal contraction. Both of these factors reduce the spacing between the two through-holes in the lower plastic, making it impossible to assemble with the top cover, thus affecting the production efficiency of the entire battery.

[0005] Summary of the Invention

[0006] The present application provides a lower plastic plate that can avoid the technical problem of being unable to be assembled with the top cover due to shrinkage generated during the production process.

[0007] The present embodiment provides a lower plastic plate, comprising:

[0008] A plastic plate body, the plastic plate body comprising a first plastic sub-plate and a second plastic sub-plate, the first plastic sub-plate and the second plastic sub-plate being sequentially arranged along the length direction of the lower plastic plate, and the first plastic sub-plate being provided with a first pole hole, the second plastic sub-plate being provided with a second pole hole, two poles being able to pass through the first pole hole and the second pole hole, respectively, and being fixedly connected to the top cover;

[0009] A connecting unit, comprising a connecting plate and a clip, wherein the connecting plate is connected to one of the first plastic sub-plate and the second plastic sub-plate, and the clip is connected to the other of the first plastic sub-plate and the second plastic sub-plate. The connecting plate is provided with a limiting hole, and the clip can be slidably clamped in the limiting hole along the length direction of the plastic plate body.

[0010] In one embodiment, the limiting hole has a first limiting wall and a second limiting wall oppositely arranged along the width direction of the plastic plate, and opposite sides of the clamping member can respectively abut against the first limiting wall and the second limiting wall.

[0011] In one embodiment, the limiting hole has a first positioning wall and a second positioning wall that are oppositely arranged along the length direction of the plastic plate, and opposite sides of the clamping member can be spaced apart from the first positioning wall and the second positioning wall respectively.

[0012] In one embodiment, the clamping member includes a limiting protrusion, which is connected to the lower end surface of the first plastic sub-plate or the lower end surface of the second plastic sub-plate, and extends away from the plastic plate body.

[0013] In one embodiment, the clamping member includes at least two limiting protrusions spaced apart along the width direction of the plastic plate body, the limiting protrusions are connected to the lower end surface of the first plastic sub-plate or the lower end surface of the second plastic sub-plate, and the limiting protrusions extend away from the plastic plate body.

[0014] In one embodiment, the connecting plate is connected to one end of the first plastic split panel close to the second plastic split panel, and the limiting protrusion is connected to one end of the second plastic split panel close to the first plastic split panel; or, the connecting plate is connected to one end of the second plastic split panel close to the second plastic split panel, and the limiting protrusion is connected to one end of the first plastic split panel close to the second plastic split panel.

[0015] In one embodiment, the first plastic sub-plate or the second plastic sub-plate is provided with a liquid injection hole, and the liquid injection hole is spaced apart from the first pole hole and the second pole hole.

[0016] In one embodiment, the upper end surface of the first plastic sub-panel and the upper end surface of the second plastic sub-panel are both provided with one of a limiting protrusion and a limiting groove, and cooperate with the other of the limiting protrusion and the limiting groove on the top cover.

[0017] An embodiment of the present application provides a top cover assembly, including a top cover and the above-mentioned lower plastic plate, wherein the lower plastic plate is connected to the lower end surface of the top cover.

[0018] An embodiment of the present application provides a battery, comprising a battery cell, a shell, and the above-mentioned top cover assembly, wherein one end of the shell has an opening, the battery cell is fixed in the shell, and the top cover assembly is circumferentially connected to the opening of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic structural diagram of a lower plastic plate provided in an embodiment of the present application;

[0020] FIG2 is a schematic diagram of the connection between the first plastic sub-plate and the connecting plate provided in an embodiment of the present application;

[0021] FIG3 is a schematic diagram of the connection between the second plastic sub-plate and the clamping member provided in an embodiment of the present application;

[0022] FIG4 is a left side view of the second plastic sub-plate and the clip-on component provided in an embodiment of the present application.

[0023] In the picture:

[0024] 1. Plastic plate; 101. Liquid injection hole; 102. Limiting protrusion; 11. First plastic sub-plate; 111. First pole hole; 12. Second plastic sub-plate; 121. Second pole hole; 21. Connecting plate; 211. Limiting hole; 2111. First limiting wall; 2112. Second limiting wall; 2113. First adjustment wall; 2114. Second adjustment wall; 22. Connector; 221. Limiting protrusion. DETAILED DESCRIPTION

[0025] The present application is described below with reference to the accompanying drawings and embodiments. The embodiments described herein are intended only to explain the present application and are not intended to limit the present application. For ease of description, the accompanying drawings only illustrate portions of the present application, not all of the structures.

[0026] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. A person of ordinary skill in the art will be able to understand the meaning of the above terms in this application according to the circumstances.

[0027] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature's horizontal height is higher than the second feature's horizontal height. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature's horizontal height is lower than the second feature's horizontal height.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0029] In the related art, the lower plastic will shrink in volume during the production process. On the one hand, this is because it undergoes a cooling and solidification process after injection molding is completed. On the other hand, it is due to thermal shrinkage caused by the increase in temperature during the injection molding of the pole or the welding of the riveted structure. The volume shrinkage of the lower plastic will shorten the hole spacing between the two pole holes on it. In the pre-design, the two pole holes on the lower plastic need to be aligned with the two pole holes on the cover plate to facilitate the installation of the pole. However, due to the volume shrinkage of the lower plastic, it cannot be assembled with the top cover, thereby affecting the production efficiency of the entire battery.

[0030] Therefore, the present application provides a lower plastic plate that can solve the problem of being unable to be assembled with the top cover due to volume shrinkage during the production process.

[0031] As shown in Figure 1, the lower plastic plate includes a plastic plate body 1 and a connecting unit. The plastic plate body 1 includes a separated first plastic sub-plate 11 and a second plastic sub-plate 12. The first plastic sub-plate 11 is provided with a first pole hole 111, and the second plastic sub-plate 12 is provided with a second pole hole 121. The two poles can pass through the first pole hole 111 and the second pole hole 121 respectively and be fixedly connected to the top cover. The connecting units are respectively provided on the first plastic sub-plate 11 and the second plastic sub-plate 12 to connect the first plastic sub-plate 11 and the second plastic sub-plate 12.

[0032] The lower plastic plate provided in this embodiment is designed to have a plastic plate body 1 as a first plastic sub-plate 11 and a second plastic sub-plate 12 that are separated, and the first pole hole 111 and the second pole hole 121 are respectively set on the first plastic sub-plate 11 and the second plastic sub-plate 12, and finally connected using a connecting unit. After the production is completed, the connecting unit can be used to compensate for the volume reduction of the first plastic sub-plate 11 and the second plastic sub-plate 12 to adjust the hole spacing between the first pole hole 111 and the second pole hole 121.

[0033] Optionally, the first plastic sub-plate 11 and the second plastic sub-plate 12 are sequentially arranged along the length direction of the lower plastic plate to facilitate adjustment of the hole distance between the first pole hole 111 and the second pole hole 121 .

[0034] Optionally, the first plastic sub-panel 11 or the second plastic sub-panel 12 is provided with an injection hole 101, which is spaced apart from the first terminal hole 111 and the second terminal hole 121 to facilitate injecting electrolyte into the battery. Optionally, since the lower plastic component is connected to the lower end surface of the top cover, the upper end surface of the first plastic sub-panel 11 and the upper end surface of the second plastic sub-panel 12 are both provided with one of a limiting protrusion 102 and a limiting groove, which can cooperate with the other of the limiting protrusion 102 and the limiting groove on the top cover to achieve assembly of the lower plastic panel and the top cover.

[0035] The connection unit includes a connecting plate 21 and a clip 22. The connecting plate 21 is connected to one of the first plastic sub-panel 11 and the second plastic sub-panel 12, and the clip 22 is connected to the other of the first plastic sub-panel 11 and the second plastic sub-panel 12. Optionally, the connecting plate 21 and the clip 22 are respectively connected to the side of the first plastic sub-panel 11 and the second plastic sub-panel 12 that is closer to each other, thereby improving the connection convenience between the connecting plate 21 and the clip 22. A limiting hole 211 is provided on the connecting plate 21. The clip 22 can be slidably and snapped into the limiting hole 211 along the length of the plastic plate body 1 to achieve connection between the first plastic sub-panel 11 and the second plastic sub-panel 12. The spacing between the first plastic sub-panel 11 and the second plastic sub-panel 12 is adjusted along the length of the plastic plate body 1, thereby adjusting the hole spacing between the first and second pole holes 111 and 121, thereby successfully completing assembly with the top cover.

[0036] As shown in Figures 2 and 3, in this embodiment, the connecting plate 21 is connected to the side of the first plastic sub-panel 11 near the second plastic sub-panel 12, and the clamping member 22 is connected to the side of the second plastic sub-panel 12 near the first plastic sub-panel 11. The connecting plate 21 and the first plastic sub-panel 11 are integrally formed, and the clamping member 22 is integrally formed with the second plastic sub-panel 12. In other feasible embodiments, the connecting plate 21 can also be connected to the side of the second plastic sub-panel 12 near the first plastic sub-panel 11, and the clamping member 22 is connected to the side of the first plastic sub-panel 11 near the second plastic sub-panel 12. The connecting plate 21 and the second plastic sub-panel 12 are integrally formed, and the clamping member 22 is integrally formed with the first plastic sub-panel 11.

[0037] For example, the limiting hole 211 has a first limiting wall 2111 and a second limiting wall 2112 disposed opposite each other along the width direction of the plastic plate 1. Opposite sides of the clip 22 can respectively abut against the first limiting wall 2111 and the second limiting wall 2112. Prior to molding, the injection mold is designed to allow for volumetric shrinkage of the limiting hole 211 and the clip 22, so that after completion, the opposite sides of the clip 22 abut against the first limiting wall 2111 and the second limiting wall 2112.

[0038] The limiting hole 211 has a first and second positioning walls 2113 and 2114 disposed opposite each other along the length of the plastic plate 1. The opposite sides of the clip 22 can be spaced apart by the first and second positioning walls 2113 and 2114, respectively. Prior to molding, the injection mold is designed to allow for volumetric shrinkage of the limiting hole 211 and the clip 22. This allows the opposite sides of the clip 22 to be spaced apart by the first and second positioning walls 2113 and 2114, respectively, after production. This allows the clip 22 to slide and snap into place within the limiting hole 211 along the length of the plastic plate 1, compensating for the volumetric shrinkage of the first and second plastic sub-panels 11 and 12, and adjusting the hole spacing between the first and second pole holes 111 and 121, thereby facilitating smooth assembly with the top cover.

[0039] In this embodiment, the two opposing sides of the clip 22 are respectively abutted against the first and second limiting walls 2111 and 2112, which are opposite to each other along the width of the limiting hole 211. The other opposing sides of the clip 22 are respectively spaced apart by the first and second adjustment walls 2113 and 2114, which are opposite to each other along the length of the limiting hole 211. This not only limits the position of the clip 22 in the width direction of the plastic plate 1, but also adjusts the relative positions of the first and second plastic sub-panels 11 and 12 in the length direction of the plastic plate 1, thereby ensuring smooth assembly with the top cover.

[0040] Optionally, the clamping member 22 includes a limiting protrusion 221, which is connected to the lower end surface of the first plastic sub-plate 11 or the lower end surface of the second plastic sub-plate 12, and extends away from the plastic plate body 1. The limiting protrusion 221 is inserted into the limiting hole 211 from top to bottom.

[0041] As shown in Figure 4, in this embodiment, the clamping member 22 includes at least two limiting protrusions 221 arranged at intervals along the width direction of the plastic plate body 1. The limiting protrusions 221 are connected to the lower end surface of the first plastic sub-plate 11 or the lower end surface of the second plastic sub-plate 12, and the limiting protrusions 221 extend away from the plastic plate body 1. The two limiting protrusions 221 located on the two side edges are respectively in contact with the first limiting wall and the second limiting wall.

[0042] In summary, the upper plastic part provided in this embodiment is slidably clamped in the limiting hole 211 along the length direction of the plastic plate body 1 by setting the clamping part 22, which can compensate for the volume reduction of the first plastic sub-plate 11 and the second plastic sub-plate 12, and adjust the hole distance between the first pole hole 111 and the second pole hole 121 so as to be smoothly assembled with the top cover.

[0043] This embodiment further provides a top cover assembly, including a top cover and the above-mentioned lower plastic plate, wherein the lower plastic plate is connected to the lower end surface of the top cover. The top cover assembly provided by this embodiment has a high assembly success rate.

[0044] This embodiment also provides a battery, including a battery cell, a shell and the above-mentioned top cover assembly, wherein an opening is provided at one end of the shell, the battery cell is placed inside the shell through the opening and is fixed to the shell, and the top cover assembly is circumferentially connected to the opening of the shell. The battery provided by this embodiment has high production efficiency.

Claims

1. A lower plastic plate, comprising: A plastic plate body (1), the plastic plate body (1) comprising a first plastic sub-plate (11) and a second plastic sub-plate (12) which are separated, the first plastic sub-plate (11) and the second plastic sub-plate (12) being arranged in sequence along the length direction of the lower plastic plate, and the first plastic sub-plate (11) being provided with a first pole hole (111), and the second plastic sub-plate (12) being provided with a second pole hole (121), and two poles being able to respectively pass through the first pole hole (111) and the second pole hole (121) and being fixedly connected to the top cover; A connecting unit, the connecting unit comprising a connecting plate (21) and a clamping piece (22), the connecting plate (21) being connected to one of the first plastic sub-plate (11) and the second plastic sub-plate (12), the clamping piece (22) being connected to the other of the first plastic sub-plate (11) and the second plastic sub-plate (12), the connecting plate (21) being provided with a limiting hole (211), the clamping piece (22) being able to be slidably clamped in the limiting hole (211) along the length direction of the plastic plate body (1).

2. The lower plastic plate according to claim 1, wherein The limiting hole (211) has a first limiting wall (2111) and a second limiting wall (2112) which are arranged opposite to each other along the width direction of the plastic plate body (1), and the opposite two sides of the clamping member (22) can respectively abut against the first limiting wall (2111) and the second limiting wall (2112).

3. The lower plastic plate according to claim 1, wherein, The limiting hole (211) has a first positioning wall (2113) and a second positioning wall (2114) which are arranged opposite to each other along the length direction of the plastic plate body (1), and the opposite sides of the clamping member (22) can be spaced apart from the first positioning wall (2113) and the second positioning wall (2114) respectively.

4. The lower plastic plate according to claim 1, wherein, The clamping member (22) comprises a limiting protrusion (221), the limiting protrusion (221) is connected to the lower end surface of the first plastic sub-plate (11) or the lower end surface of the second plastic sub-plate (12), and the limiting protrusion (221) extends away from the plastic plate body (1).

5. The lower plastic plate according to claim 4, wherein, The clamping member (22) comprises at least two limiting protrusions (221) arranged at intervals along the width direction of the plastic plate body (1); the limiting protrusions (221) are connected to the lower end surface of the first plastic sub-plate (11) or the lower end surface of the second plastic sub-plate (12), and the limiting protrusions (221) extend away from the plastic plate body (1).

6. The lower plastic plate according to claim 4, wherein, The connecting plate (21) is connected to one end of the first plastic sub-plate (11) close to the second plastic sub-plate (12), and the limiting protrusion (221) is connected to one end of the second plastic sub-plate (12) close to the first plastic sub-plate (11); or, the connecting plate (21) is connected to one end of the second plastic sub-plate (12) close to the second plastic sub-plate (12), and the limiting protrusion (221) is connected to one end of the first plastic sub-plate (11) close to the second plastic sub-plate (12).

7. The lower plastic plate according to any one of claims 1-6, wherein, The first plastic sub-board (11) or the second plastic sub-board (12) is provided with a liquid injection hole (101), and the liquid injection hole (101) is spaced from the first pole hole (111) and the second pole hole (121).

8. The lower plastic plate according to any one of claims 1-6, wherein, One of a limiting convex (102) and a limiting groove is provided on the upper end surface of the first plastic sub-board (11) and the upper end surface of the second plastic sub-board (12), and is matched with the other of the limiting convex (102) and the limiting groove on the top cover.

9. A top cover assembly, comprising a top cover and the lower plastic board according to any one of claims 1-8, wherein the lower plastic board is connected to the lower end surface of the top cover.

10. A battery, comprising an electric core, a housing and the top cover assembly according to claim 9, wherein one end of the housing has an opening, the electric core is fixed in the housing, and the top cover assembly is circumferentially connected to the opening of the housing.

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