Lower plastic structure

Abstract

The utility model provides a lower plastic cement structure, the lower plastic cement structure comprises a plastic cement body and a hot melting point, the plastic cement body is arranged in a flat plate shape, the plastic cement body is provided with a post terminal hole and a liquid injection hole, the post terminal hole and the liquid injection hole penetrate through two opposite surfaces of the plastic cement body, and the hot melting point is arranged at the end part of the plastic cement body. When it is ensured that the hot melting point and the Mylar film are subjected to hot melting to form assembly so as to ensure the safety of the battery cell, the utilization rate of the internal space of the battery cell is effectively improved by removing the convex hulls from the plastic body.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a lower plastic structure. Background Art

[0002] In power batteries, the lower plastic is an insulating component installed under the battery top cover. As one of the main structures of the top cover, it plays the important role of insulating connecting piece and smooth aluminum sheet to ensure the airtightness of the battery shell. Therefore, the lower plastic is related to the safety of the battery cell and the effective use of the internal space, which in turn affects the capacity of the battery.

[0003] In the conventional art, the existing lower plastic is generally provided with a convex bump to prevent the tab from being inserted in. However, the internal space of the battery cell is not fully utilized, resulting in space waste. Utility Model Content

[0004] The present disclosure provides a lower plastic structure to effectively improve the utilization rate of the internal space of the battery cell.

[0005] The present disclosure provides a lower plastic structure, comprising: a plastic body and a hot melting point, wherein the plastic body is arranged in a flat plate shape, and is provided with a pole hole and an injection hole, wherein the pole hole and the injection hole pass through two opposite surfaces of the plastic body, and the hot melting point is arranged at the end of the plastic body.

[0006] In some embodiments, the invention further comprises: a pole boss, wherein the pole boss is arranged on a surface of one side of the plastic body, and the pole boss and the pole hole are arranged coaxially.

[0007] In some embodiments, the hot melting point is protruded and disposed on a side of the plastic body facing away from the pole boss.

[0008] In some embodiments, there are multiple thermal melting points, and each thermal melting point is evenly distributed at both ends of the plastic body.

[0009] In some embodiments, the hot melting point includes a first hot melting point, a second hot melting point, a third hot melting point, a fourth hot melting point, a fifth hot melting point, and a sixth hot melting point, and the first hot melting point, the second hot melting point, the third hot melting point, the fourth hot melting point, the fifth hot melting point, and the sixth hot melting point are arranged at both ends of the plastic body along the length direction.

[0010] In some embodiments, the first thermal melting point, the second thermal melting point, and the third thermal melting point are spaced apart at the first end of the plastic body along the length direction, and the fourth thermal melting point, the fifth thermal melting point, and the sixth thermal melting point are spaced apart at the second end of the plastic body along the length direction.

[0011] In some embodiments, the first thermal melting point, the third thermal melting point, the fourth thermal melting point, and the sixth thermal melting point are disposed at corners of the plastic body.

[0012] In some embodiments, the first thermal melting point and the third thermal melting point are disposed on both sides of the first end of the plastic body, and the fourth thermal melting point and the sixth thermal melting point are disposed on both sides of the second end of the plastic body.

[0013] In some embodiments, the second melting point and the fifth melting point are oppositely disposed at two ends of the plastic body along the length direction.

[0014] In some embodiments, the material with a hot melting point is one of polyamide, polyester sulfonate, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer and thermoplastic polyurethane.

[0015] The present disclosure provides a lower plastic structure that effectively improves the utilization rate of the internal space of the battery cell by removing the convex part of the plastic body while ensuring the hot melting point and the assembly with the Mylar film to ensure the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Hereinafter, the present disclosure will be described in more detail based on embodiments and with reference to the accompanying drawings:

[0017] Figure 1 A schematic structural diagram of a lower plastic structure provided in an embodiment of the present disclosure;

[0018] Figure 2 FIG. 4 is a schematic plan view of the lower plastic structure in one embodiment. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, and to fully understand and implement how the present disclosure applies technical means to solve technical problems and achieve the corresponding technical effects, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. The embodiments of the present disclosure and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the scope of protection of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present disclosure.

[0020] It should be noted that the terms "first," "second," and the like in the specification and claims of the present disclosure and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in sequences other than those illustrated or described herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0021] Example 1

[0022] Figure 1 This is a schematic diagram of a lower plastic structure provided by an embodiment of the present disclosure. Figure 1 As shown, a lower plastic structure includes: a plastic body 100 and a hot melt point 200. The plastic body 100 is arranged in a flat plate shape. The plastic body 100 is provided with a pole hole 101 and a liquid injection hole 102. The pole hole 101 and the liquid injection hole 102 pass through two opposite surfaces of the plastic body 100. The hot melt point 200 is arranged at the end of the plastic body 100.

[0023] In this embodiment, the plastic body 100 is arranged in a flat plate shape. The surface of the plastic body 100 is a whole plane except for the hot melt point 200, thereby improving the internal space utilization of the battery cell. The pole hole 101 is used for assembly with the pole. The center of the pole hole 101 and the center of the liquid injection hole 102 are on the same horizontal line. The horizontal line is set along the length direction of the plastic body 100, that is, the center of the pole hole 101 and the center of the liquid injection hole 102 are set along the length direction of the plastic body 100. Specifically, there are two pole holes 101, and the two pole holes 101 are respectively a first through hole and a second through hole. The first through hole is used for assembly with the positive electrode, and the second through hole is used for assembly with the negative electrode. The hot melt point 200 is used to form an assembly by hot melting with the Mylar film (also known as the insulating film). The number of hot melt points 200 can be one or more, and the multiple hot melt points 200 are spaced apart at the ends of the plastic body 100.

[0024] In some embodiments, the plastic body 100 is further provided with an exhaust hole 103 , which penetrates two opposite surfaces of the plastic body 100 . The exhaust hole 103 effectively maintains internal pressure balance and helps dissipate heat from the battery, reducing the internal temperature, thereby ensuring battery performance and service life.

[0025] In the above embodiment, while ensuring that the hot melt point 200 and the Mylar film are hot-melted to form an assembly to ensure the safety of the battery cell, the utilization rate of the internal space of the battery cell is effectively improved by removing the convex part of the plastic body 100.

[0026] In one embodiment, the lower plastic structure further includes: a pole boss 104 , which is disposed on a surface of one side of the plastic body 100 , and the pole boss 104 and the pole hole 101 are coaxially disposed.

[0027] In this embodiment, the pole boss 104 is disposed around the pole hole 101 and has a through hole. The through hole of the pole boss 104 is coaxial with the pole hole 101 so that the pole can pass through the pole hole 101 and the pole through hole. The pole boss 104 and the plastic body 100 are integrally molded to ensure the airtightness of the battery during assembly. In addition, an "L"-shaped step is provided on the side of the pole boss 104 away from the plastic body 100 to enhance the sealing between the lower plastic and the top cover. In some embodiments, there are two pole bosses 104, one for each of the positive pole and the other for the negative pole. In some embodiments, an injection boss is further provided around the injection hole 102. The injection boss is provided on the surface of one side of the plastic body 100. The injection boss and the pole boss 104 are located on the same side of the plastic body 100. The injection boss also has a through hole. The through hole of the injection boss is coaxially arranged with the injection hole 102 to facilitate the injection of electrolyte.

[0028] In one embodiment, the hot melting point 200 is protrudingly disposed on a side of the plastic body 100 away from the terminal boss 104 .

[0029] In this embodiment, the side of the plastic body 100 facing away from the terminal boss 104 is the assembly side with the Mylar film. The hot melt point 200 is protruding from the assembly side of the plastic body 100 to facilitate the assembly of the hot melt point 200 and the Mylar film during assembly, forming a sealed barrier, effectively preventing external impurities such as dust and moisture from entering the interior of the battery, thereby protecting the safety and performance of the battery cell.

[0030] In one embodiment, there are multiple thermal melting points 200 , and each thermal melting point 200 is evenly distributed at two ends of the plastic body 100 .

[0031] In this embodiment, the hot melt points 200 evenly distributed at both ends of the plastic body 100 are assembled with the Mylar film to effectively improve the safety of the battery cell and reduce the entry of external impurities such as dust and moisture into the battery.

[0032] Refer to it again Figure 2In one embodiment, the hot melting point 200 includes a first hot melting point 201, a second hot melting point 202, a third hot melting point 203, a fourth hot melting point 204, a fifth hot melting point 205 and a sixth hot melting point 206. The first hot melting point 201, the second hot melting point 202, the third hot melting point 203, the fourth hot melting point 204, the fifth hot melting point 205 and the sixth hot melting point 206 are arranged at both ends of the plastic body 100 along the length direction.

[0033] In this embodiment, there are six hot melt points 200, each located at either end of the plastic body 100 along its length. The hot melt points 200 at either end of the plastic body 100 are assembled with the corresponding ends of the Mylar film to form a sealed barrier, thereby enhancing protection for the battery cell. In one embodiment, the hot melt points 200 are made of one of polyamide, polyester sulfonate, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, and thermoplastic polyurethane.

[0034] In one embodiment, the first thermal melting point 201, the second thermal melting point 202, and the third thermal melting point 203 are spaced apart at the first end of the plastic body 100 along the length direction, and the fourth thermal melting point 204, the fifth thermal melting point 205, and the sixth thermal melting point 206 are spaced apart at the second end of the plastic body 100 along the length direction.

[0035] In this embodiment, the same number of thermal melting points 200 are evenly distributed at both ends of the plastic body 100, wherein the first thermal melting point 201, the second thermal melting point 202, and the third thermal melting point 203 are spaced apart at the first end of the plastic body 100 along the length direction, and the fourth thermal melting point 204, the fifth thermal melting point 205, and the sixth thermal melting point 206 are spaced apart at the second end of the plastic body 100 along the length direction. In this embodiment, the first spacing between the first thermal melting point 201, the second thermal melting point 202, and the third thermal melting point 203 is the same as the second spacing between the fourth thermal melting point 204, the fifth thermal melting point 205, and the sixth thermal melting point 206. In some embodiments, the first spacing and the second spacing may be different, that is, the two groups of thermal melting points 200 located at both ends of the plastic body 100 are staggered, thereby improving the safety of the battery cell.

[0036] In one embodiment, the first thermal melting point 201 , the third thermal melting point 203 , the fourth thermal melting point 204 , and the sixth thermal melting point 206 are disposed at corners of the plastic body 100 .

[0037] In this embodiment, the plastic body 100 is configured in a rectangular flat plate shape, and the first melting point 201, the third melting point 203, the fourth melting point 204, and the sixth melting point 206 are located at the four corners of the plastic body 100. This ensures that the forces at the melting points of the plastic body 100 and the Mylar film are balanced, thereby enhancing the airtightness of the barrier.

[0038] In one embodiment, the first melting point 201 and the third melting point 203 are located on both sides of the first end of the plastic body 100 , and the fourth melting point 204 and the sixth melting point 206 are located on both sides of the second end of the plastic body 100 .

[0039] In this embodiment, the first melting point 201 , the third melting point 203 , the fourth melting point 204 and the sixth melting point 206 are located on the long sides of the plastic body 100 to prevent the Mylar film and the melting points 200 from breaking due to large expansion of the battery cell during cycling.

[0040] In one embodiment, the second melting point 202 and the fifth melting point 205 are oppositely disposed at two ends of the plastic body 100 along the length direction.

[0041] In this embodiment, the second melting point 202 and the fifth melting point 205 are located on the two short sides of the plastic body 100. Preferably, the second melting point 202 and the fifth melting point 205 are located at the midpoints of the short sides, so that the forces at the melting points of the plastic body 100 and the Mylar film are balanced. In some embodiments, the second melting point 202 and the fifth melting point 205 can be staggered on the two short sides of the plastic body 100.

[0042] Example 2

[0043] In this embodiment, a lower plastic structure includes: the lower plastic is provided with a first hot melting point 201, a second hot melting point 202, a third hot melting point 203, a fourth hot melting point 204, a fifth hot melting point 205, and a sixth hot melting point 206, which are hot-melted to the Mylar film to form an assembly. In addition, the positions of the first hot melting point 201, the third hot melting point 203, the fourth hot melting point 204, and the sixth hot melting point 206 are not limited to the side, but can also be on the large surface. The advantage of such a distribution is that it prevents the Mylar film and the hot melting point 200 of the lower plastic from breaking due to the large-surface expansion of the battery cell during cycling.

[0044] The lower plastic is provided with a first through-hole and a second through-hole for assembling with the terminal. A step is provided around the through-hole, and the rest of the step is a flat surface, improving internal battery space utilization. The hot-melt location and the removal of bulges on the lower plastic improve cell space utilization.

[0045] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A lower plastic structure, characterized in that: include: The plastic body and the hot melting point are arranged in a flat plate shape and are provided with a pole hole and a liquid injection hole. The pole hole and the liquid injection hole penetrate two opposite surfaces of the plastic body, and the hot melting point is arranged at the end of the plastic body.

2. The lower plastic structure according to claim 1, characterized in that: Also includes: The pole boss is arranged on the surface of one side of the plastic body, and the pole boss and the pole hole are coaxially arranged.

3. The lower plastic structure according to claim 2, characterized in that: The hot melting point is protrudingly arranged on a side of the plastic body away from the pole boss.

4. The lower plastic structure according to claim 1, characterized in that: There are multiple thermal melting points, and each thermal melting point is evenly distributed at two ends of the plastic body.

5. The lower plastic structure according to claim 1, characterized in that: The thermal melting points include a first thermal melting point, a second thermal melting point, a third thermal melting point, a fourth thermal melting point, a fifth thermal melting point and a sixth thermal melting point, and the first thermal melting point, the second thermal melting point, the third thermal melting point, the fourth thermal melting point, the fifth thermal melting point and the sixth thermal melting point are arranged at both ends of the plastic body along the length direction.

6. The lower plastic structure according to claim 5, characterized in that: The first, second and third thermal melting points are spaced apart at the first end of the plastic body along the length direction, and the fourth, fifth and sixth thermal melting points are spaced apart at the second end of the plastic body along the length direction.

7. The lower plastic structure according to claim 5, characterized in that: The first thermal melting point, the third thermal melting point, the fourth thermal melting point, and the sixth thermal melting point are arranged at the corners of the plastic body.

8. The lower plastic structure according to claim 5, characterized in that: The first thermal melting point and the third thermal melting point are arranged on both sides of the first end of the plastic body, and the fourth thermal melting point and the sixth thermal melting point are arranged on both sides of the second end of the plastic body.

9. The lower plastic structure according to claim 5, characterized in that: The second thermal melting point and the fifth thermal melting point are oppositely arranged at two ends of the plastic body along the length direction.

10. The lower plastic structure according to claim 1, characterized in that: The material with the hot melting point is one of polyamide, polyester sulfonate, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer and thermoplastic polyurethane.

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