Lower plastic part, top cover assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a lower plastic part, a top cover assembly and a battery. The lower plastic part comprises a plurality of plastic split bodies which are sequentially connected in a lap joint mode. A first limiting part is arranged on one of the two adjacent plastic split bodies, a second limiting part is arranged on the other one of the two adjacent plastic split bodies, the first limiting part comprises a clamping groove extending in the first direction, the second limiting part comprises a clamping part extending in the first direction, and the clamping part is inserted into the clamping groove in a matched mode. According to the lower plastic part, the manufacturing difficulty is reduced, the requirement for manufacturing a longer and thinner lower plastic part is met, the lower plastic part is more convenient and reliable to install, and the manufacturability and the yield are higher.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lower plastic part, a top cover assembly and a battery. Background Art

[0002] Currently, the common lithium-ion battery cover consists of a pole, an upper plastic part, a plain aluminum sheet, a sealing ring, an explosion-proof valve, and a lower plastic part. The lower plastic part mainly plays the role of insulating the plain aluminum sheet and fixing the core package. The lower plastic part is assembled together with the pole and the plain aluminum sheet as part of the top cover assembly, and is usually an integral whole. With the development of new energy batteries, in order to improve the battery energy density and internal space utilization, it is necessary to continuously optimize the size of the lower plastic part, so that the lower plastic part is designed to be thinner and longer. However, due to the limitations of the injection molding process, the manufacturability and yield of the lower plastic part are difficult to meet the design requirements, and it is easy to warp and deform during installation. The split lower plastic in the existing technology is simply formed by dividing the lower plastic part into two or more parts and structures, and multiple parts are spliced ​​together to form a complete lower plastic part. However, the various components of such a lower plastic part will swing and rotate during use, and deviate from the original installation position, resulting in cumbersome installation steps and prone to deformation and swinging beyond the boundary, which is not conducive to improving the yield rate of the battery.

[0003] Therefore, there is an urgent need to provide a new lower plastic component, top cover assembly and battery to solve the above technical problems in the prior art. Utility Model Content

[0004] One purpose of the present invention is to provide a lower plastic part, which reduces the difficulty of manufacturing, meets the demand of manufacturing a longer and thinner lower plastic part, is more convenient and reliable to install, and has higher manufacturability and yield rate.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The lower plastic part includes multiple plastic splits, which are overlapped in sequence; one of the two adjacent plastic splits is provided with a first limiting portion, and the other is provided with a second limiting portion, the first limiting portion includes a clamping groove extending along the first direction, and the second limiting portion includes a clamping portion extending along the first direction, and the clamping portion is fitted and plugged into the clamping groove.

[0007] Optionally, the width of at least part of the above-mentioned snap-in groove gradually decreases along the above-mentioned first direction and toward the direction close to the above-mentioned second limiting portion to form a first groove portion, and the width of at least part of the above-mentioned snap-in portion gradually increases along the above-mentioned first direction and toward the direction close to the above-mentioned second limiting portion to form a first protrusion, and the above-mentioned first protrusion cooperates and snaps into the above-mentioned first groove portion.

[0008] Optionally, a second groove portion whose width gradually increases toward the second limiting portion is provided at one end of the first groove portion close to the second limiting portion, and a second protrusion portion whose width gradually decreases toward the first limiting portion is provided at one end of the first protrusion portion close to the first limiting portion, and the second protrusion is engaged and snap-fitted into the second groove portion.

[0009] Optionally, a plurality of the first limiting portions and the second limiting portions are provided in a one-to-one correspondence.

[0010] Optionally, the first limiting portion and the second limiting portion are connected with a clearance fit.

[0011] Optionally, two plastic split bodies are provided, including a first plastic split body and a second plastic split body that overlap each other, the first plastic split body is provided with a first pole hole, and the second plastic split body is provided with a second pole hole.

[0012] Optionally, the first plastic body is provided with a plurality of ventilation holes.

[0013] Another object of the present invention is to provide a top cover assembly that can reduce the difficulty of manufacturing the plastic parts thereunder, thereby improving manufacturability and yield.

[0014] To achieve this purpose, the present invention adopts the following technical solutions:

[0015] A top cover assembly comprises a top cover sheet and a lower plastic component as described in any of the above solutions, wherein the lower plastic component is fixed to the lower end surface of the top cover sheet.

[0016] Optionally, an anti-rotation column is provided on the top of the plastic split body, and an anti-rotation groove is provided on the bottom of the top cover sheet, and the anti-rotation column is inserted into the anti-rotation groove.

[0017] Another object of the present invention is to provide a battery with a top cover assembly having higher manufacturability and higher yield rate.

[0018] To achieve this purpose, the present invention adopts the following technical solutions:

[0019] A battery comprises a top cover assembly as described in any of the above solutions.

[0020] Beneficial effects:

[0021] The lower plastic part in the present invention shortens the length of each plastic split, which can reduce the aspect ratio of each plastic split and reduce the difficulty of making each plastic split during injection molding, and then the thickness of the lower plastic part can be made thinner and the total length can be made longer to meet the needs of different usage scenarios; at the same time, when making a longer and thinner lower plastic part, the split design makes the finished product yield higher and the manufacturing difficulty reduced, and the reduction of defective products reduces the manufacturing cost, which has good economic benefits; and since the plastic splits are connected by the cooperation between the first limiting part and the second limiting part, the first limiting part includes a clamping groove extending along the first direction, and the second limiting part includes a clamping part extending along the first direction, when the clamping part and the clamping groove are plugged into each other, the mutually connected plastic splits are limited in the second direction, avoiding the plastic splits from swinging left and right, thereby improving the stability of the lower plastic part installed on the top cover. The lower plastic part reduces the difficulty of manufacturing, meets the demand for manufacturing longer and thinner lower plastic parts, is more convenient and reliable to install, and has higher manufacturability and yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an axonometric view of the top cover assembly provided by a specific embodiment of the present utility model;

[0023] Figure 2 This is an axonometric view of the lower plastic part provided by the specific embodiment of the utility model;

[0024] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0025] In the picture:

[0026] 101. Anti-rotation column; 102. Air vent; 103. Reinforcing rib; 110. First plastic body; 111. First pole hole; 120. Second plastic body; 121. Second pole hole; 130. Top cover; 131. Positive pole; 132. Negative pole; 133. Explosion-proof valve; 140. Second limiting portion; 141. Clamping portion; 142. First protrusion; 143. Second protrusion; 150. First limiting portion; 151. Clamping groove; 152. First groove; 153. Second groove. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0028] In the description of this utility model, 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 connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] In the present invention, 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 may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0030] 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 the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0031] The first direction described in this embodiment is Figure 1 and Figure 2 The X direction shown in is the length direction of the plastic split and the lower plastic part, and the second direction is Figure 1 and Figure 2 The Y direction shown in , that is, the width direction of the plastic split body and the lower plastic part, the first direction and the second direction are perpendicular to each other.

[0032] like Figures 1 to 3 As shown, the lower plastic part includes multiple plastic splits, and the multiple plastic splits are overlapped in sequence; a first limiting portion 150 is provided on one of the two adjacent plastic splits, and a second limiting portion 140 is provided on the other. The first limiting portion 150 includes a clamping groove 151 extending along the first direction, and the second limiting portion 140 includes a clamping portion 141 extending along the first direction. The clamping portion 141 is fitted and plugged into the clamping groove 151.

[0033] The lower plastic part in this embodiment shortens the length of each plastic part, reduces the aspect ratio of each plastic part, and reduces the difficulty of manufacturing each plastic part during injection molding. As a result, the thickness of the lower plastic part can be made thinner and the total length can be made longer to meet the needs of different usage scenarios. At the same time, when manufacturing a longer and thinner lower plastic part, the split design makes its finished product yield higher and the manufacturing difficulty reduced. At the same time, the reduction in defective products reduces the manufacturing cost, which has good economic benefits. In addition, since the plastic parts are connected by the cooperation between the first limiting portion 150 and the second limiting portion 140, the first limiting portion 150 includes a clamping groove 151 extending along the first direction, and the second limiting portion 140 includes a clamping portion 141 extending along the first direction, when the clamping portion 141 and the clamping groove 151 are plugged into each other, the mutually connected plastic parts are limited in the second direction, preventing the plastic parts from swinging left and right, thereby improving the stability of the lower plastic part installed on the top cover 130. The lower plastic part reduces the difficulty of manufacturing, meets the demand for manufacturing longer and thinner lower plastic parts, is more convenient and reliable to install, and has higher manufacturability and yield rate.

[0034] Furthermore, the width of at least a portion of the engaging groove 151 gradually decreases along the first direction toward the second limiting portion 140 to form a first groove 152, while the width of at least a portion of the engaging portion 141 gradually increases along the first direction toward the second limiting portion 140 to form a first protrusion 142. The first protrusion 142 engages with the first groove 152. The aforementioned widths refer to the dimensions in the second direction. This arrangement enables the first groove 152 to limit the first protrusion 142 in the first direction, preventing the two plastic parts from moving away from each other in the first direction and improving the connection stability between the plastic parts of the chain.

[0035] Optionally, a second groove 153 is provided at one end of the first groove 152 near the second limiting portion 140, the width of which gradually increases toward the second limiting portion 140. A second protrusion 143 is provided at one end of the first protrusion 142 near the first limiting portion 150, the width of which gradually decreases toward the first limiting portion 150. The second protrusion 143 engages with the second groove 153. When the first groove 152 and the first protrusion 142 engage, the second groove 153 also engages with the second protrusion 143. The second groove 153 further limits the second protrusion 143 in the first direction, preventing the two connected plastic parts from approaching each other in the first direction, thereby improving the reliability and stability of the connection between the two connected plastic parts.

[0036] Please continue to refer to Figure 2The first limiting portion 150 and the second limiting portion 140 are provided in a one-to-one correspondence. In this embodiment, the first limiting portion 150 and the second limiting portion 140 are provided in a plurality of intervals along the second direction, which can improve the connection reliability between the plastic parts.

[0037] In this embodiment, the first limiting portion 150 is connected with the second limiting portion 140 with a clearance fit. The use of the first limiting portion 150 and the second limiting portion 140 with a clearance fit can reduce the difficulty of installation of the first limiting portion 150 and the second limiting portion 140 while ensuring a stable connection between the first limiting portion 150 and the second limiting portion 140, thereby improving production efficiency.

[0038] Furthermore, two plastic parts are provided, including a first plastic part 110 and a second plastic part 120 that overlap each other. The first plastic part 110 is provided with a first pole hole 111, and the second plastic part 120 is provided with a second pole hole 121. The first pole hole 111 corresponds to the positive pole 131 on the top cover plate 130, and the second pole hole 121 corresponds to the negative pole 132 on the top cover plate 130. This simplifies the structure of the lower plastic part, facilitates the assembly of the first plastic part 110 and the second plastic part 120, and then installs them on the bottom of the top cover plate 130. This ensures that the lower plastic part is more securely assembled and fixed in the top cover assembly. At the same time, the aspect ratio of each plastic part can be reduced, which facilitates production and reduces manufacturing difficulty.

[0039] Optionally, the first plastic body 110 is provided with a plurality of vents 102. In this embodiment, the vents 102 are provided on the second plastic body 120, corresponding to the explosion-proof valve 133 provided on the top cover 130. This prevents the lower plastic component from blocking the pressure relief path of the explosion-proof valve 133, and also provides ventilation and prevents electrolyte accumulation, thereby improving the safety of the top cover assembly after molding.

[0040] As a preferred embodiment, reinforcing ribs 103 are protruded on the wall surface of the plastic split. The reinforcing ribs 103 are arranged in a cross shape, presenting a grid shape, which can improve the mechanical strength of each plastic split and prevent each plastic split from deformation, rupture, etc. when subjected to force.

[0041] Please continue to refer to Figure 1 This embodiment also provides a top cover assembly that reduces the difficulty of manufacturing the lower plastic part, thereby improving manufacturability and yield. The top cover assembly includes a top cover sheet 130 and a lower plastic part as described in any of the above solutions, the lower plastic part being fixed to the lower end surface of the top cover sheet 130.

[0042] Furthermore, an anti-rotation post 101 is provided on the top of the plastic body, and an anti-rotation groove is provided on the bottom of the top cover 130. The anti-rotation post 101 is inserted into the anti-rotation groove. This arrangement prevents the plastic body from rotating relative to the top cover 130 after the lower plastic component is installed on the top cover 130, thereby improving the installation stability between the plastic body and the top cover 130, preventing the plastic body from interfering with the installation between the top cover assembly and the battery housing, and improving safety and reliability.

[0043] The present invention further provides a battery having a top cover assembly with improved manufacturability and yield. The battery includes a top cover assembly as described in any of the above-mentioned solutions. Specifically, the battery can be used in electric vehicles, electric bicycles, energy storage devices, and ships, as long as the battery is used for power supply, and no further details are given here.

[0044] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. The lower plastic part is characterized by: The invention comprises a plurality of plastic splits, which are overlapped in sequence; a first limiting portion (150) is provided on one of two adjacent plastic splits, and a second limiting portion (140) is provided on the other; the first limiting portion (150) comprises a clamping groove (151) extending along a first direction; the second limiting portion (140) comprises a clamping portion (141) extending along the first direction; the clamping portion (141) is plugged into the clamping groove (151).

2. The lower plastic part according to claim 1, characterized in that: The width of at least part of the engaging groove (151) gradually decreases along the first direction and toward the direction close to the second limiting portion (140) to form a first groove portion (152), and the width of at least part of the engaging portion (141) gradually increases along the first direction and toward the direction close to the second limiting portion (140) to form a first convex portion (142), and the first convex portion (142) is engaged with the first groove portion (152).

3. The lower plastic part according to claim 2, characterized in that: A second groove portion (153) whose width gradually increases in a direction approaching the second limiting portion (140) is provided at one end of the first groove portion (152) close to the second limiting portion (140); a second convex portion (143) whose width gradually decreases in a direction approaching the first limiting portion (150) is provided at one end of the first convex portion (142) close to the first limiting portion (150); and the second convex portion (143) is engaged with and snapped into the second groove portion (153).

4. The lower plastic part according to claim 3, characterized in that: A plurality of the first limiting portions (150) and the second limiting portions (140) are provided in a one-to-one correspondence.

5. The lower plastic part according to claim 1, characterized in that: The first limiting portion (150) and the second limiting portion (140) are connected in a clearance fit.

6. The lower plastic part according to any one of claims 1 to 5, characterized in that: The plastic split body is provided with two, including a first plastic split body (110) and a second plastic split body (120) overlapped with each other, the first plastic split body (110) is provided with a first pole hole (111), and the second plastic split body (120) is provided with a second pole hole (121).

7. The lower plastic part according to claim 6, characterized in that: The first plastic body (110) is provided with a plurality of ventilation holes (102).

8. Top cover assembly, characterized in that, It comprises a top cover sheet (130) and a lower plastic part according to any one of claims 1 to 7, wherein the lower plastic part is fixed on the lower end surface of the top cover sheet (130).

9. The top cover assembly according to claim 8, wherein: An anti-rotation column (101) is provided on the top of the plastic body, and an anti-rotation groove is provided on the bottom of the top cover sheet (130), and the anti-rotation column (101) is inserted into the anti-rotation groove.

10. A battery, characterized in that Comprising a top cover assembly as claimed in claim 8 or 9.

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