Lower plastic and battery cover plate

Abstract

The utility model relates to a lower plastic cement and a battery cover plate, the lower plastic cement comprises a plurality of plastic cement parts and connecting parts, the plurality of plastic cement parts are arranged along the length direction of the lower plastic cement, two adjacent plastic cement parts are connected through the connecting parts, the width of the connecting parts is smaller than that of the plastic cement parts, and the width of the connecting parts is smaller than that of the plastic cement parts. Notches are formed in the two sides of the connecting part in the width direction. According to the utility model, the problem of hole position deviation when the lower plastic and the end cover are assembled due to bending deformation of the lower plastic is solved, and the assembly yield of the cover plate is improved.

Description

Technical Field

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

[0002] Lithium batteries have advantages such as high energy and many cycle times, and are widely used in various fields. A lithium battery usually consists of a housing, a battery cell and a cover plate. As an important part of the battery structure, the cover plate directly affects the battery performance and safety. The cover plate includes an end cover and a lower plastic installed under the end cover. The lower plastic separates the battery cell from the end cover to insulate the battery cell from the end cover. The lower plastic and the end cover of a riveted battery cover plate are usually fixed by ultrasonic welding, which requires a high assembly accuracy of the lower plastic and the end cover. However, at present, after the lower plastic is injection-molded, there may be large internal stresses inside, resulting in bending deformation, so that the hole positions deviate during the assembly of the lower plastic and the end cover, thus reducing the assembly yield rate of the cover plate. Summary of the Utility Model

[0003] Aiming at the above problems, the purpose of the utility model is to provide a lower plastic and a battery cover plate, solve the problem of hole position deviation during the assembly of the lower plastic and the end cover caused by the bending deformation of the lower plastic, and improve the assembly yield rate of the cover plate.

[0004] The purpose of the utility model is realized by the following technical solutions:

[0005] A lower plastic is provided, which includes a plurality of plastic parts and a connecting part. The plurality of plastic parts are arranged along the length direction of the lower plastic, and adjacent two plastic parts are connected by the connecting part. The width of the connecting part is smaller than the width of the plastic part, and notches are formed on both sides in the width direction of the connecting part.

[0006] The lower plastic designed by the utility model is composed of a plurality of plastic parts arranged. Adjacent two plastic parts are connected by a connecting part. The width of the connecting part is smaller than that of the plastic part, so notches are formed on both sides of the connecting part. When the lower plastic is injection-molded, the internal stress can be released through the notches to reduce the bending deformation of the lower plastic. Compared with the lower plastic with equal width, if deformation occurs, the lower plastic designed by the utility model changes from overall shrinkage deformation to shrinkage of the plastic parts and bending of the connecting part. Due to the high plasticity of the lower plastic material, under the action of external force, it can easily return to its original shape without damaging the lower plastic. Therefore, the assembly difficulty of the lower plastic and the end cover is reduced, and the assembly yield rate of the battery cover plate is improved.

[0007] Furthermore, the connecting part coincides with the central axis in the length direction of the lower plastic, and the notches are symmetrically distributed on both sides of the connecting part.

[0008] The axis position of the connecting part coincides with the axis of the rectangular lower plastic, and the notches are symmetrically distributed on both sides of the connecting part, enabling more balanced stress release during the injection molding of the lower plastic and reducing the possibility of deformation.

[0009] Further, the plastic part includes a supporting plastic part, and a first reinforcing rib is provided at the bottom of the supporting plastic part. Both ends of the first reinforcing rib are connected to the connecting parts at both ends of the supporting plastic part.

[0010] The supporting plastic part enhances the structural strength of the lower plastic. The first reinforcing rib is designed along the length direction of the lower plastic at the bottom of the supporting plastic part, and its both ends are connected to the connecting parts, forming an integral body, so that the strength of the lower plastic in the length direction is enhanced and it is not easy to deform.

[0011] Further, a plurality of second reinforcing ribs are provided at the bottom of the supporting plastic part. The second reinforcing ribs are arranged in parallel at intervals and are perpendicular to the first reinforcing rib.

[0012] A plurality of second reinforcing ribs are provided at the bottom of the supporting plastic part. The second reinforcing ribs are perpendicular to the first reinforcing rib, so that the strength of the lower plastic in the width direction is enhanced and it is not easy to deform.

[0013] A battery cover plate is provided, which includes the above-mentioned lower plastic, an end cover, and a pole post. The lower plastic is connected to the end cover, and the pole post passes through the lower plastic and the end cover.

[0014] The present utility model designs a battery cover plate including the above-mentioned lower plastic, and further includes an end cover and a pole post. The lower plastic is installed at the bottom of the end cover to separate the battery cell and the end cover, and the pole post passes through the lower plastic and is riveted to the end cover.

[0015] Further, a plurality of positioning posts are provided on the surface of the lower plastic facing the end cover, and the end cover is provided with positioning holes corresponding to the positioning posts one by one.

[0016] The assembly between the lower plastic and the end cover is completed by ultrasonic welding. After the positioning posts on the surface of the lower plastic are inserted into the positioning holes of the end cover, the positioning posts are melted by ultrasonic welding, thereby fixing the two.

[0017] Further, two of the plastic parts are provided with first pole holes, the end cover is provided with second pole holes corresponding to the first pole holes, and the pole post passes through the first pole holes and the second pole holes.

[0018] First pole holes are respectively opened on the plastic parts at both ends of the lower plastic, second pole holes are opened at the corresponding positions of the end cover, and the pole post passes through the first pole holes and the second pole holes and is riveted to the end cover.

[0019] Furthermore, it further includes an explosion-proof valve assembly. An explosion-proof groove is provided in one of the plastic parts, and a plurality of explosion-proof through holes are provided at the bottom of the explosion-proof groove. The explosion-proof valve assembly is arranged corresponding to the explosion-proof through holes.

[0020] When the internal pressure of the battery exceeds the preset safety value during thermal runaway, the explosion-proof valve assembly automatically opens to release the pressure, and the gas inside the battery is released through the explosion-proof through holes, thereby preventing the battery from cracking and exploding.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] The lower plastic designed by the present utility model is composed of a plurality of plastic parts arranged. Adjacent two plastic parts are connected by a connecting part, and the width of the connecting part is smaller than that of the plastic part. Therefore, gaps are formed on both sides of the connecting part. When the lower plastic is injection-molded, the internal stress can be released through the gaps to reduce the bending deformation of the lower plastic. Compared with the lower plastic with equal width, if deformation occurs, the lower plastic designed by the present utility model changes from overall shrinkage deformation to shrinkage of the plastic part and bending of the connecting part. Due to the high plasticity of the lower plastic material, under the action of external force, it can easily return to its original shape without damaging the lower plastic. Therefore, the assembly difficulty between the lower plastic and the end cover is reduced, and the assembly yield rate of the battery cover plate is improved. Description of the Drawings

[0023] Figure 1 It is a structural diagram of the lower plastic in an embodiment of the present utility model.

[0024] Figure 2 It is a structural diagram of the bottom of the lower plastic in an embodiment of the present utility model.

[0025] Figure 3 It is an explosion diagram of the battery cover plate in an embodiment of the present utility model.

[0026] Figure 4 It is a structural diagram of the bottom of the end cover in an embodiment of the present utility model.

[0027] Illustration: 1. Lower plastic; 2. End cover; 3. Pole; 11. Plastic part; 12. Connecting part; 13. Gap; 21. Second pole hole; 22. Positioning hole; 23. Explosion-proof valve assembly; 111. Support plastic part; 112. First reinforcing rib; 113. Second reinforcing rib; 114. Positioning post; 115. First pole hole; 116. Explosion-proof groove; 117. Explosion-proof through hole. Detailed Embodiment

[0028] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0029] As shown Figure 1 in the figure, a lower plastic part 1 is provided, which includes a plurality of plastic parts 11 and a connecting part 12. The plurality of plastic parts 11 are arranged along the length direction of the lower plastic part 1, and adjacent two plastic parts 11 are connected by the connecting part 12. The width of the connecting part 12 is smaller than the width of the plastic part 11, and notches 13 are formed on both sides in the width direction of the connecting part 12.

[0030] The lower plastic part 1 designed by the utility model is composed of a plurality of plastic parts 11 arranged. Adjacent two plastic parts 11 are connected by the connecting part 12. The width of the connecting part 12 is smaller than that of the plastic part 11. Therefore, notches 13 are formed on both sides of the connecting part 12. After the lower plastic part 1 is injection-molded, the internal stress can be released through the notches 13 to reduce the bending deformation of the lower plastic part 1. Compared with the lower plastic part 1 with equal width, if deformation occurs, the lower plastic part 1 designed by the utility model is decomposed from the overall shrinkage deformation into the shrinkage of the plastic part 11 and the bending of the connecting part 12. Due to the high plasticity of the lower plastic material, under the action of external force, it can easily return to its original shape without damaging the lower plastic part 1. Therefore, the assembly difficulty of the lower plastic part 1 and the end cover 2 is reduced, and the assembly yield rate of the battery cover plate is improved.

[0031] As shown Figure 1 in the figure, the connecting part 12 coincides with the central axis in the length direction of the lower plastic part 1, and the notches 13 are symmetrically distributed on both sides of the connecting part 12. The connecting part 12 coincides with the axis position in the length direction of the lower plastic part 1. Therefore, the notches 13 are symmetrically distributed on both sides of the connecting part 12, and the stress release is more balanced, and the possibility of deformation is smaller.

[0032] As shown Figure 2 in the figure, the plastic part 11 includes a supporting plastic part 111. A first reinforcing rib 112 is provided at the bottom of the supporting plastic part 111, and both ends of the first reinforcing rib 112 are connected to the connecting part 12 at both ends of the supporting plastic part 111. A plurality of second reinforcing ribs 113 are provided at the bottom of the supporting plastic part 111. The second reinforcing ribs 113 are arranged in parallel at intervals and are perpendicular to the first reinforcing rib 112. The supporting plastic part 111 improves the structural strength of the lower plastic part 1. A first reinforcing rib 112 is designed along the length direction of the lower plastic part 1 at the bottom of the supporting plastic part 111, and both ends of it are connected to the connecting part 12 to form an integral body, so that the strength of the lower plastic part 1 in the length direction is enhanced and it is not easy to deform. A plurality of second reinforcing ribs 113 are provided at the bottom of the supporting plastic part 111. The second reinforcing ribs 113 are perpendicular to the first reinforcing rib 112, so that the strength of the lower plastic part 1 in the width direction is enhanced and it is not easy to deform.

[0033] As shown Figure 3 and Figure 4As shown in the figure, the present utility model also designs a battery cover plate, which includes the above-mentioned lower plastic 1, end cover 2, pole column 3 and explosion-proof valve assembly 23. The lower plastic 1 is connected to the end cover 2, and the pole column 3 passes through the lower plastic 1 and the end cover 2. The surface of the lower plastic 1 facing the end cover 2 is provided with a plurality of positioning posts 114, and the end cover 2 is provided with positioning holes 22 corresponding to the positioning posts 114 one by one. The plastic parts 11 at both ends of the lower plastic 1 are provided with first pole holes 115, and the end cover 2 is provided with second pole holes 21 corresponding to the first pole holes 115. The pole column 3 passes through the first pole hole 115 and the second pole hole 21. One of the plastic parts 11 of the lower plastic 1 is provided with an explosion-proof groove 116, and the bottom of the explosion-proof groove 116 is provided with a plurality of explosion-proof through holes 117. The explosion-proof valve assembly 23 is arranged corresponding to the explosion-proof through holes 117.

[0034] The battery cover plate designed by the present utility model, which includes the above-mentioned lower plastic 1, also includes an end cover 2, a pole column 3 and an explosion-proof valve assembly 23. The lower plastic 1 is installed at the bottom of the end cover 2 to separate the battery cell and the end cover 2. The assembly between the lower plastic 1 and the end cover 2 is completed by ultrasonic welding. After the positioning posts 114 on the surface of the lower plastic 1 are inserted into the positioning holes 22 of the end cover 2, the positioning posts 114 are melted by ultrasonic welding, so that the two are fixed. First pole holes 115 are respectively opened on the plastic parts 11 at both ends of the lower plastic 1, and second pole holes 21 are opened at the corresponding positions of the end cover 2. The pole column 3 passes through the first pole hole 115 and the second pole hole 21 and is riveted and connected to the end cover 2. The explosion-proof valve assembly 23 is an important component of the battery safety system. When the internal pressure of the battery exceeds the preset safety value during thermal runaway, the explosion-proof valve assembly 23 automatically opens to release the pressure, and the gas inside the battery is released through the explosion-proof through holes 117, thereby preventing the battery from bursting and exploding.

[0035] In the description of the present utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0036] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more unless otherwise specifically defined.

[0037] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A lower plastic, characterized in that, It includes a plurality of plastic parts and connecting parts. The plurality of plastic parts are arranged along the length direction of the lower plastic, and adjacent two plastic parts are connected by the connecting parts. The width of the connecting part is smaller than the width of the plastic part, and notches are formed on both sides in the width direction of the connecting part.

2. The lower plastic according to claim 1, characterized in that, The connecting part coincides with the central axis in the length direction of the lower plastic, and the notches are symmetrically distributed on both sides of the connecting part.

3. The lower plastic according to claim 1, characterized in that, The plastic part includes a support plastic part, and the bottom of the support plastic part is provided with a first reinforcing rib, and both ends of the first reinforcing rib are connected to the connecting parts at both ends of the support plastic part.

4. The lower plastic according to claim 3, characterized in that, The bottom of the support plastic part is provided with a plurality of second reinforcing ribs, the second reinforcing ribs are arranged in parallel at intervals and are perpendicular to the first reinforcing rib.

5. A battery cover plate, characterized in that, It includes the lower plastic, an end cover and a pole column according to any one of claims 1-4. The lower plastic is connected to the end cover, and the pole column penetrates through the lower plastic and the end cover.

6. The battery cover plate according to claim 5, characterized in that, A plurality of positioning posts are provided on the surface of the lower plastic facing the end cover, and the end cover is provided with positioning holes corresponding to the positioning posts one by one.

7. The battery cover plate according to claim 5, characterized in that Two of the plastic parts are provided with first pole holes, the end cover is provided with second pole holes corresponding to the first pole holes, and the pole column passes through the first pole holes and the second pole holes.

8. The battery cover plate according to claim 5, characterized in that, It further includes an explosion-proof valve assembly. An explosion-proof groove is provided on one of the plastic parts, and a plurality of explosion-proof through holes are provided at the bottom of the explosion-proof groove. The explosion-proof valve assembly is arranged corresponding to the explosion-proof through holes.

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