Upper plastic structure for battery and battery

Abstract

The invention relates to the technical field of battery structures, in particular to an upper plastic structure for a battery and the battery. The upper plastic structure comprises a positive electrode plastic part, a negative electrode plastic part, a first connecting part and a second connecting part, a second connecting part is arranged at one end of the negative electrode plastic part; the first connecting part comprises a convex column, the second connecting part comprises a through hole, and the convex column has a first form in which the convex column can be conveniently inserted into the through hole and a second form in which the convex column is riveted with the through hole; and hot melting treatment needs to be carried out on the convex column for connection and matching of the positive electrode plastic part and the negative electrode plastic part, so that the convex column is converted into a second form from a first form. According to the invention, the positive electrode plastic part and the negative electrode plastic part are connected through the hot melting structure, so that the connection strength of the first connection part and the second connection part can be improved, a seam protruding out of the surface can be prevented from being formed at the connection part, and the surface flatness of the upper plastic structure is improved.

Description

Technical Field

[0001] This invention relates to the field of battery structure technology, and in particular to an upper plastic structure for a battery and the battery itself. Background Technology

[0002] Currently, power batteries typically consist of cells and modules (PACks). The cell is the smallest functional unit, directly converting chemical energy into electrical energy. The terminals are located on the top surface of the cell, representing its highest point. To prevent stress on the terminals, protrusions are provided on the top surface of the cell. On one hand, these protrusions support the load on the module pack, serving as part of the module pack structure and enhancing the overall strength of the product. Simultaneously, the protrusions separate the terminals from the explosion-proof valve, achieving thermal and electrical separation and further improving product safety. However, on the other hand, the protrusions make the top surface of the cell uneven, affecting the fit between the upper plastic structure and the top surface of the cell, which can lead to a decrease in the battery's insulation performance.

[0003] To improve the fit between the upper plastic structure and the top surface of the battery cell, the upper plastic structure is designed as two interconnected components based on the positive and negative electrodes. However, to avoid the explosion-proof valve, stress concentration occurs at the connection point between the two components, causing the upper plastic structure to easily warp at the connection point when it is fitted to the top surface of the battery cell. Summary of the Invention

[0004] This invention aims to solve the technical problems existing in related technologies. Therefore, this invention proposes an upper plastic structure for a battery and a battery in general, to solve the problem that existing upper plastic structures tend to peel up when attached to the battery casing.

[0005] This invention provides an upper plastic structure for a battery, comprising: A positive electrode plastic component, wherein a first connecting portion is provided at the first end of the positive electrode plastic component; A negative electrode plastic component, wherein a second connecting portion is provided at the first end of the negative electrode plastic component; The first connecting part includes a protruding post, and the second connecting part includes a through hole. The protruding post has a first form that facilitates insertion into the through hole and a second form that is riveted to the through hole. The connection and mating of the positive electrode plastic component and the negative electrode plastic component requires the protrusion to undergo a heat-melting process to transform the protrusion from a first form to a second form.

[0006] According to the present invention, a plastic structure for a battery is provided, wherein a countersunk platform is provided at one end of the through hole, and when the protrusion is transformed into a second form by hot melting treatment, the end of the protrusion extends toward the countersunk platform to form a rib, and the rib engages with the countersunk platform.

[0007] According to the upper plastic structure for the battery provided by the application, the depth H of the sink is 0.2mm≤H≤0.5mm, the width W of the sink is 0.25mm≤W≤3.0mm, and the diameter D of the convex column is 0.4mm≤D≤10mm.

[0008] According to the upper plastic structure for the battery provided by the application, the first connecting part further comprises a flange seat, and the convex column is vertically arranged on the flange seat.

[0009] According to the upper plastic structure for the battery provided by the application, the second connecting part further comprises a groove, the groove is arranged on the bottom surface of the negative plastic part, and the flange seat is embedded in the groove. The through hole extends from the top surface of the negative plastic part to the bottom surface of the groove, the convex column is connected with the through hole, and the sink is located on the top surface of the negative plastic part.

[0010] According to the upper plastic structure for the battery provided by the application, the positive plastic part further comprises: The first pole column hole is arranged at the second end of the positive plastic part opposite to the first connecting part. The first convex column is arranged on the top surface of the positive plastic part. The first convex column is located between the first pole column hole and the first connecting part.

[0011] According to the upper plastic structure for the battery provided by the application, the negative plastic part further comprises: The second pole column hole is arranged at the second end of the negative plastic part opposite to the second connecting part. The second convex column is arranged on the top surface of the negative plastic part. The second convex column is located between the second pole column hole and the second connecting part.

[0012] According to the upper plastic structure for the battery provided by the application, the positive plastic part further comprises a first notch, and the first notch is arranged between two first connecting parts. The negative plastic part further comprises a second notch, and the second notch is arranged between two second connecting parts. When the positive plastic part and the negative plastic part are connected, the first notch and the second notch are connected to form a through hole for avoiding the explosion-proof valve.

[0013] According to the upper plastic structure for the battery provided by the application, the second convex column is provided with a liquid injection avoiding hole, and the liquid injection avoiding hole penetrates through both sides of the negative plastic part.

[0014] The second aspect of the present application provides a battery, comprising a shell, a pole, a welding block, a lower plastic, and a sealing ring. The upper plastic structure for the battery of any one of the above is covered on the top surface of the shell.

[0015] The one or more technical solutions in the present application have at least one of the following technical effects: The positive plastic part and the negative plastic part are connected through the hot melt structure, which can improve the connection strength of the first connection part and the second connection part, and avoid forming a joint protruding from the surface at the connection part, thereby improving the surface flatness of the upper plastic structure.

[0016] In addition to the technical problems solved by the present application, the technical features of the technical solutions constituted by the present application, and the advantages brought by these technical features, other technical features of the present application and the advantages brought by these technical features will be further described with reference to the accompanying drawings, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 The split schematic diagram of the upper plastic structure for the battery provided by the embodiment of the present application.

[0019] Figure 2 The external schematic diagram of the battery provided by the embodiment of the present application.

[0020] Figure 3 The schematic diagram of the negative plastic part provided by the embodiment of the present application.

[0021] Figure 4 The Figure 3 The cross-sectional view of A-A section.

[0022] Figure 5 The Figure 4 The enlarged schematic diagram of B partial view.

[0023] Figure 6 The schematic diagram of the convex column in the first form connected with the through hole provided by the embodiment of the present application.

[0024] Figure 7 The schematic diagram of the convex column in the second form connected with the through hole provided by the embodiment of the present application.

[0025] Figure 8 Another schematic view of the upper plastic structure is provided for the embodiment of the present application.

[0026] Figure 9 For Figure 2 The cross-sectional view of the battery along the longitudinal symmetry plane.

[0027] Reference signs: 100, positive plastic part; 110, first connecting part; 111, protruding column; 112, rib edge; 113, flange seat; 120, first pole column hole; 130, first protruding column; 140, first notch; 200, negative plastic part; 210, second connecting part; 211, through hole; 212, sink; 213, groove; 220, second pole column hole; 230, second protruding column; 231, liquid injection avoiding hole; 240, second notch; 300, shell; 400, pole column; 500, welding block; 600, lower plastic; 700, sealing ring. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly described below with reference to the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0029] In the embodiments of the present application, an upper plastic structure for a battery is introduced.

[0030] As Figure 1 and Figure 2 The upper plastic structure mainly includes a positive plastic part 100 and a negative plastic part 200.

[0031] The first end of the positive plastic part 100 is provided with a first connecting part 110, and the second end of the positive plastic part 100 is provided with a first pole column hole 120.

[0032] The first end of the negative plastic part 200 is provided with a second connecting part 210, and the second end of the negative plastic part 200 is provided with a second pole column hole 220.

[0033] The first connecting part 110 comprises a protruding column 111. The second connecting part 210 comprises a through hole 211. The protruding column 111 has a first form and a second form. In the first form, the protruding column 111 keeps the same cross section along its axial direction, so as to be inserted into the through hole 211. In the second form, the upper end cross section of the protruding column 111 is larger than the lower end cross section of the protruding column 111, so that the end of the protruding column 111 can be clamped with the through hole 211, and the riveting fixation of the first connecting part 110 and the second connecting part 210 is realized.

[0034] The connection and cooperation of the positive plastic part 100 and the negative plastic part 200 need to heat-melt the protruding column 111, so as to change the protruding column 111 from the first form to the second form, so that the positive plastic part 100 and the negative plastic part 200 can be heat-melt connected through the first connecting part 110 and the second connecting part 210.

[0035] In the embodiment, the positive plastic part 100 and the negative plastic part 200 are connected through the heat-melt structure, which can improve the connection strength of the first connecting part 110 and the second connecting part 210, and can avoid forming a joint protruding from the surface at the connection position, and improve the surface flatness of the upper plastic structure. The connection through the heat-melt treatment can be completed in a short time, which improves the production efficiency and assembly consistency, and can effectively prevent the connection from loosening due to vibration or temperature change.

[0036] On the basis of the above embodiment, another embodiment of the present application introduces an upper plastic structure for a battery.

[0037] As shown in Figures 3 to 5 One end of the through hole 211 is provided with a sink 212. When the protruding column 111 is changed to the second form through the heat-melt treatment, the end of the protruding column 111 extends to form a rib 112 to the sink 212. The rib 112 is clamped with the sink 212, which improves the reliability and anti-peeling ability of the connection, and can still stably connect when subjected to lateral force or expansion and contraction stress caused by temperature difference.

[0038] As shown in Figure 6 and Figure 7 The depth H of the sink 212 is in the range of 0.2mm≤H≤0.5mm. The width W of the sink 212 is in the range of 0.25mm≤W≤3.0mm. The diameter D of the protruding column 111 is in the range of 0.4mm≤D≤10mm. By controlling the size of the sink 212 and the protruding column 111, the heat-melt structure can have sufficient connection strength.

[0039] Further, the first connecting part 110 further comprises a flange seat 113. The convex column 111 is vertically arranged on the flange seat 113. The flange seat 113 can increase the connecting area of the first connecting part 110 and the positive plastic part 100, improve the structural rigidity of the first connecting part 110, and prevent the convex column 111 from being broken or deformed due to external force during assembly or use.

[0040] Correspondingly, the second connecting part 210 further comprises a recess 213. The notch of the recess 213 is located at the bottom surface of the negative plastic part 200. The flange seat 113 is embedded in the recess 213. This embedded structure not only realizes the preliminary positioning of the positive and negative plastic parts 200, facilitates subsequent hot melting operation, but also further limits the movement of the connecting part in the plane, improves the assembly accuracy and the centering of the overall structure.

[0041] The through hole 211 extends from the top surface of the negative plastic part 200 to the bottom surface of the recess 213.

[0042] The convex column 111 is connected with the through hole 211. The sink 212 is located at the top surface of the negative plastic part 200, so that the rib edge 112 formed on the convex column 111 after the hot melting treatment can be completely accommodated in the sink 212 and will not protrude from the surface of the plastic part, thereby ensuring the overall flatness of the upper plastic structure, avoiding poor adhesion with the battery shell 300 due to the protrusion of the connecting point, and affecting the insulation and sealing performance.

[0043] On the basis of the above embodiment, another embodiment of the present application introduces an upper plastic structure for a battery.

[0044] As shown in Figures 1 to 3 The positive plastic part 100 further comprises a first pole hole 120 and a first boss 130.

[0045] The first pole hole 120 is arranged at the second end of the positive plastic part 100 opposite to the first connecting part 110.

[0046] The first boss 130 is arranged at the top surface of the positive plastic part 100. The first boss 130 is located between the first pole hole 120 and the first connecting part 110.

[0047] Correspondingly, the negative plastic part 200 further comprises a second pole hole 220 and a second boss 230. The second pole hole 220 is arranged at the second end of the negative plastic part 200 opposite to the second connecting part 210.

[0048] The second boss 230 is arranged at the top surface of the negative plastic part 200. The second boss 230 is located between the second pole hole 220 and the second connecting part 210.

[0049] The first boss 130 and the second boss 230 are used to fit the bosses on the battery housing 300, ensuring that the upper plastic structure is completely fitted to the top surface of the battery housing 300, enhancing insulation protection and improving thermal management.

[0050] Furthermore, the positive electrode plastic component 100 also includes a first notch 140. The first notch 140 is disposed between the two first connecting portions 110.

[0051] The negative electrode plastic component 200 also includes a second notch 240. The second notch 240 is disposed between the two second connecting portions 210.

[0052] When the positive electrode plastic component 100 and the negative electrode plastic component 200 are connected, the first notch 140 and the second notch 240 align to form a through-hole for avoiding the explosion-proof valve. This through-hole not only provides the necessary operating and pressure relief space for the explosion-proof valve, but also avoids affecting its normal operation due to the plastic component covering it, significantly improving the battery's safety performance. At the same time, the notch design also reduces material usage and component weight, which is beneficial for improving battery energy density.

[0053] Furthermore, the second boss 230 is provided with a liquid injection clearance hole 231. The liquid injection clearance hole 231 extends through both sides of the negative electrode plastic component 200. The liquid injection clearance hole 231 provides a channel for the battery liquid injection process, avoiding repeated disassembly and re-plasticization, simplifying the production process, and improving packaging efficiency and quality consistency.

[0054] Based on the above embodiments, another embodiment of the present invention introduces an upper plastic structure for a battery.

[0055] like Figure 8 As shown, the upper plastic structure mainly includes a positive electrode plastic component 100 and a negative electrode plastic component 200.

[0056] One end of the positive electrode plastic component 100 is provided with a first electrode post hole 120, and the other end of the positive electrode plastic component 100 is provided with a first boss 130. A first connecting part 110 is provided on the first boss 130.

[0057] One end of the negative electrode plastic component 200 is provided with a second electrode post hole 220, and the other end of the negative electrode plastic component 200 is provided with a second boss 230. A second connecting part 210 is provided on the second boss 230.

[0058] And the first boss 130 and the second boss 230 are spliced with each other to form an integral boss between the first pole hole 120 and the second pole hole 220. The integrated boss structure enhances the overall rigidity and anti-deformation capability, provides more uniform support for the pole 400 area, and simplifies the mold structure and injection molding process, thereby reducing production costs.

[0059] The first connecting part 110 includes a protruding column 111. The second connecting part 210 includes a through hole 211. The protruding column 111 has a first form and a second form. In the first form, the protruding column 111 maintains the same cross section along its axial direction to facilitate the insertion of the through hole 211. In the second form, the upper end cross section of the protruding column 111 is larger than the lower end cross section of the protruding column 111, so that the end of the protruding column 111 can be clamped with the through hole 211, realizing the riveting fixation of the first connecting part 110 and the second connecting part 210.

[0060] In this embodiment, the first boss 130 and the second boss 230 are optimized as an integral whole, which can provide more space for the first connecting part 110 and the second connecting part 210. This not only simplifies the structure of the positive plastic part 100 and the negative plastic part 200, reduces the difficulty of production, but also increases the size of the first connecting part 110 and the second connecting part 210, thereby increasing the connection strength.

[0061] In addition, another embodiment of the present application introduces a battery. The battery includes the upper plastic structure described in any of the above embodiments.

[0062] As shown in Figure 9 , the battery further includes a shell 300, a pole 400, a welding block 500, a lower plastic 600, and a sealing ring 700.

[0063] Specifically, the shell 300 is provided with two bosses. The pole 400 is installed at the top end of the shell 300. The bosses can support the stress of the module Pack, thereby improving the overall strength of the battery. Moreover, the bosses can separate the pole 400 from the explosion-proof valve, thereby achieving thermal-electric separation and improving the safety of the battery.

[0064] In order to adapt to the bosses on the shell 300 and ensure the fit between the upper plastic structure and the shell 300, the upper plastic structure is designed in a split form composed of the positive plastic part 100 and the negative plastic part 200. The first boss 130 provided on the positive plastic part 100 and the second boss 230 provided on the negative plastic part 200 are adapted to the bosses on the shell 300. This adaptive design ensures the close contact between the upper plastic and the battery shell 300, eliminates the assembly gap, not only improves the mechanical stability, but also effectively improves the insulation level and dustproof and waterproof performance of the battery.

[0065] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0066] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or simply indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or simply indicate that the horizontal height of the first feature is less than that of the second feature.

[0068] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not limited to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0069] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A plastic upper structure for a battery, characterized in that, include: A positive electrode plastic component, wherein a first connecting portion is provided at the first end of the positive electrode plastic component; A negative electrode plastic component, wherein a second connecting portion is provided at the first end of the negative electrode plastic component; The first connecting part includes a protruding post, and the second connecting part includes a through hole. The protruding post has a first form that facilitates insertion into the through hole and a second form that is riveted to the through hole. The connection and mating of the positive electrode plastic component and the negative electrode plastic component requires the protrusion to undergo a heat-melting process to transform the protrusion from a first form to a second form.

2. The upper plastic structure for a battery according to claim 1, characterized in that, A countersunk platform is provided at one end of the through hole. When the protrusion is transformed into a second form through heat melting treatment, the end of the protrusion extends toward the countersunk platform to form a rib, and the rib engages with the countersunk platform.

3. The upper plastic structure for a battery according to claim 2, characterized in that, The depth H of the recessed platform is in the range of 0.2 mm ≤ H ≤ 0.5 mm, the width W of the recessed platform is in the range of 0.25 mm ≤ W ≤ 3.0 mm, and the diameter D of the protruding column is in the range of 0.4 mm ≤ D ≤ 10 mm.

4. The upper plastic structure for a battery according to any one of claims 1 to 3, characterized in that, The first connecting part also includes a flange seat, and the protrusion is vertically disposed on the flange seat.

5. The upper plastic structure for a battery according to claim 4, characterized in that, The second connecting part further includes a groove, the opening of which is located on the bottom surface of the negative electrode plastic part, and the flange seat is embedded in the groove; The through hole extends from the top surface of the negative electrode plastic part to the bottom surface of the groove, the protrusion is connected to the through hole, and the recess is located on the top surface of the negative electrode plastic part.

6. The upper plastic structure for a battery according to claim 5, characterized in that, The positive electrode plastic component also includes: The first electrode post hole is located at the second end of the positive electrode plastic part, which is opposite to the first connecting part; The first protrusion is disposed on the top surface of the positive electrode plastic part; The first boss is located between the first pole hole and the first connecting part.

7. The upper plastic structure for a battery according to claim 6, characterized in that, The negative electrode plastic component also includes: The second electrode post hole is provided at the second end of the negative electrode plastic part, which is opposite to the second connecting part; The second protrusion is provided on the top surface of the negative electrode plastic part; The second boss is located between the second pole hole and the second connecting part.

8. The upper plastic structure for a battery according to any one of claims 1 to 3, characterized in that, The positive electrode plastic component further includes a first notch, which is disposed between the two first connecting portions; The negative electrode plastic component also includes a second notch, which is disposed between the two second connecting portions; When the positive electrode plastic component and the negative electrode plastic component are connected, the first notch and the second notch are joined to form a through port for avoiding the explosion-proof valve.

9. The upper plastic structure for a battery according to claim 7, characterized in that, The second boss is provided with a liquid injection clearance hole, which extends through both sides of the negative electrode plastic part.

10. A battery, characterized in that, Includes housing, pole, welding block, lower plastic and sealing ring; The upper plastic structure for the battery as described in any one of claims 1 to 9 covers the top surface of the housing.

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