Battery cover plate structure and square battery

Abstract

The utility model provides a battery cover plate structure and a square battery. The battery cover plate structure comprises a cover plate, a pole assembly, lower plastic cement and a connecting piece, the cover plate is provided with a mounting hole, the pole assembly is located in the mounting hole and connected with the cover plate, the lower plastic cement is connected to the inner side of the cover plate, the lower plastic cement is provided with a receding hole, the receding hole is communicated with the mounting hole, and the connecting piece is connected with the mounting hole. A part of the structure of the pole assembly penetrates through the receding hole and then is connected with the connecting piece, a positioning column is arranged on the side face, away from the cover plate, of the lower plastic, a positioning groove is formed in the connecting piece, and the positioning column is located in the positioning groove so that the connecting piece can abut against the lower plastic. An embossed pattern layer is arranged on the side face, away from the lower plastic, of the connecting piece. The connecting piece is matched with the lower plastic, the connecting piece is prevented from deviating during welding, and meanwhile one side face of the connecting piece is provided with the embossed pattern layer so that the two side faces of the connecting piece can be distinguished.

Description

Technical Field

[0001] The present disclosure relates to the field of battery covers, and in particular to a battery cover structure and a square battery. Background Art

[0002] In the battery structure, a connecting piece is usually required to connect the pole ear of the pole core with the pole column to achieve electrical connection so that the power supply circuit of the battery structure is connected. At present, the connecting piece is generally welded to the pole column on the cover plate first, but there is a problem of displacement of the connecting piece during the welding process, which affects the effective welding area between the connecting piece and the pole column, thereby resulting in poor overload capacity of the battery.

[0003] In order to solve the above problems, a Chinese patent with application number CN202120601245.5 discloses a lithium battery cover structure and a lithium battery, including a cover body, a lower plastic and a connecting plate. The cover body is provided with a pole, and the lower plastic is provided on one side of the cover body close to the battery cell. One of the connecting plate and the lower plastic is provided with a positioning column, and the other is provided with a positioning hole. When the connecting plate is in contact with the lower plastic, the positioning column penetrates the positioning hole to make the connecting plate abut against the pole.

[0004] However, the design of the above lithium battery cover structure has the following problems during use:

[0005] The above-mentioned lithium battery cover structure is provided with a positioning column on one of the lower plastic or the connecting sheet, and a positioning hole on the other. When the connecting sheet is attached to the lower plastic, the positioning column and the positioning hole cooperate to achieve a positioning effect, thereby preventing the connecting sheet from shifting. However, since the connecting sheet and the pole need to be welded to the welding point using equipment (such as a vibration plate), the front and back sides of the connecting sheet need to be confirmed during welding, and the connecting sheet of the above-mentioned lithium battery cover structure has the problem of being difficult to distinguish the front and back sides, which results in additional steps during welding and reduces production efficiency.

[0006] Therefore, there is an urgent need for a battery assembly that can prevent the connection piece from shifting during welding and that can easily identify the front and back sides of the connection piece. Utility Model Content

[0007] The purpose of the present disclosure is to overcome the deficiencies in the prior art and to provide a battery cover structure and a square battery that prevent the connection piece from shifting during welding and facilitates identification of the front and back sides of the connection piece.

[0008] The purpose of this disclosure is achieved through the following technical solutions:

[0009] A battery cover structure, comprising:

[0010] A cover plate, a pole assembly, a lower plastic and a connecting piece, wherein the cover plate is provided with a mounting hole, the pole assembly is located in the mounting hole and connected to the cover plate, the lower plastic is connected to the inner side of the cover plate, the lower plastic is provided with an avoidance hole, the avoidance hole is connected to the mounting hole, a partial structure of the pole assembly passes through the avoidance hole and is connected to the connecting piece, and one side of the connecting piece is arranged adjacent to the middle of the lower plastic,

[0011] A positioning column is provided on one side of the lower plastic away from the cover plate, and a positioning groove is provided on the connecting piece. The positioning column is located in the positioning groove so that the connecting piece abuts against the lower plastic, and an embossed layer is provided on one side of the connecting piece away from the lower plastic.

[0012] In one embodiment, the embossed layer has a circular or polygonal structure.

[0013] In one embodiment, the number of the positioning posts is two, the number of the positioning slots is two, and each positioning post is located in a corresponding positioning slot.

[0014] In one embodiment, the lower plastic is provided with reinforcing ribs along the edge of the length direction.

[0015] In one of the embodiments, the battery cover structure also includes an explosion-proof valve, the cover is provided with an explosion-proof hole, the explosion-proof valve is located in the explosion-proof hole and connected to the cover, the lower plastic is provided with a plurality of exhaust holes, and the plurality of exhaust holes are evenly spaced and distributed in the middle of the lower plastic.

[0016] In one embodiment, each of the exhaust holes is elliptical in shape.

[0017] In one embodiment, the pole assembly includes a pole, an insulating plastic part and a sealing ring, the insulating plastic part is connected to the cover plate, the insulating plastic part is provided with a mounting groove, the mounting groove is communicated with the mounting hole, one end of the pole is connected to the connecting piece, the other end of the pole passes through the avoidance hole, the mounting hole and the mounting groove in sequence and is connected to the insulating plastic part, the sealing ring is located in the mounting hole and abuts against the pole.

[0018] In one of the embodiments, the lower plastic is further provided with an observation hole, the observation hole is communicated with the avoidance hole, and the observation hole is arranged corresponding to the sealing ring.

[0019] In one of the embodiments, the battery cover structure further includes a sealing nail, the cover is provided with a liquid injection hole, the sealing nail is located in the liquid injection hole and connected to the cover.

[0020] A square battery comprises the battery cover structure described in any one of the above embodiments.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] 1. In the above-mentioned battery cover structure, the lower plastic is connected to the inner side of the cover, the pole assembly is connected to the connecting piece through the avoidance hole, a positioning column is provided on the side of the lower plastic facing away from the cover, and a positioning groove is provided on the connecting piece. When the connecting piece is welded to the pole assembly, the positioning column is located in the positioning groove to achieve positioning and anti-rotation effects, thereby avoiding displacement of the connecting piece during welding.

[0023] 2. In the above-mentioned battery cover structure, an embossed layer is provided on the side of the connecting piece away from the lower plastic to distinguish the two sides of the connecting piece, so as to facilitate identification of the front and back sides of the connecting piece, thereby preventing the connecting piece from being installed upside down during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic structural diagram of a battery cover structure according to an embodiment;

[0026] Figure 2 for Figure 1 Another structural schematic diagram of the battery cover structure shown;

[0027] Figure 3 for Figure 1 A schematic structural diagram of a connecting piece of a battery cover structure shown;

[0028] Figure 4 for Figure 1 A schematic diagram of the structure of the lower plastic of the battery cover structure shown;

[0029] Figure 5 for Figure 1 A schematic structural diagram of the pole assembly of the battery cover structure shown. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] The present invention provides a battery cover structure, including a cover, a pole assembly, a lower plastic and a connecting piece, the cover is provided with a mounting hole, the pole assembly is located in the mounting hole and connected to the cover, the lower plastic is connected to the inner side of the cover, the lower plastic is provided with an avoidance hole, the avoidance hole is communicated with the mounting hole, a partial structure of the pole assembly is connected to the connecting piece after passing through the avoidance hole, one side edge of the connecting piece is arranged adjacent to the middle part of the lower plastic, a positioning column is provided on a side of the lower plastic facing away from the cover, the connecting piece is provided with a positioning groove, the positioning column is located in the positioning groove, so that the connecting piece is in contact with the lower plastic, and an embossed layer is provided on a side of the connecting piece facing away from the lower plastic.

[0034] In the battery cover structure, the lower plastic is connected to the inner side of the cover, the pole assembly is connected to the connecting piece through the avoidance hole, a positioning column is provided on the side of the lower plastic away from the cover, and a positioning groove is provided on the connecting piece. When the connecting piece is welded to the pole assembly, the positioning column is located in the positioning groove to achieve positioning and anti-rotation effects, thereby avoiding the connection piece from being offset during welding. Furthermore, an embossed layer is provided on the side of the connecting piece away from the lower plastic to distinguish the two sides of the connecting piece, so as to facilitate identification of the front and back sides of the connecting piece, thereby avoiding the connecting piece from being installed upside down during welding.

[0035] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0036] like Figures 1 to 4As shown, a battery cover structure 10 of an embodiment includes a cover 100, a pole assembly 200, a lower plastic 300 and a connecting piece 400, the cover 100 is provided with a mounting hole 110, the pole assembly 200 is located in the mounting hole 110 and connected to the cover 100, the lower plastic 300 is connected to the inner side of the cover 100, the lower plastic 300 is provided with an avoidance hole 310, the avoidance hole 310 is communicated with the mounting hole 110, a partial structure of the pole assembly 200 passes through the avoidance hole 310 and is connected to the connecting piece 400, one side edge of the connecting piece 400 is arranged adjacent to the middle part of the lower plastic 100, that is, the connecting piece extends toward the middle part of the lower plastic 100 to increase the area of ​​the connecting piece, thereby improving the current flow capacity of the connecting piece.

[0037] Furthermore, a positioning column 320 is provided on a side of the lower plastic 300 facing away from the cover plate 100, and a positioning groove 410 is provided on the connecting piece 400. The positioning column 320 is located in the positioning groove 410 so that the connecting piece 400 is abutted against the lower plastic 300. An embossed layer 420 is provided on a side of the connecting piece 400 facing away from the lower plastic 300 to facilitate identification of the front and back sides of the connecting piece 400.

[0038] In this embodiment, there are two pole assemblies 200, which are respectively the positive pole assembly and the negative pole assembly, and there are also two connecting sheets 400, which are respectively the positive connecting sheet and the negative connecting sheet. There are also two mounting holes 110. The positive pole assembly is connected to the positive connecting sheet after passing through one of the mounting holes 110, and the negative pole assembly is connected to the negative connecting sheet after passing through the other mounting hole 110. In addition, positioning columns 320 are provided at both ends of the inner side surface of the lower plastic 300, which are respectively the first positioning column and the second positioning column. The first positioning column abuts against the positioning groove of the positive connecting sheet, and the second positioning column abuts against the positioning groove of the negative connecting sheet to prevent the positive connecting sheet and the negative connecting sheet from shifting during welding. Furthermore, one side of the positive connecting sheet and the negative connecting sheet are both provided with an embossed layer 420, and the other side of the positive connecting sheet and the negative connecting sheet are both planar structures. Specifically, one side provided with the embossed layer 420 is connected to the battery cell, and one side of the planar structure is connected to the pole assembly 200.

[0039] In the battery cover structure 10, the lower plastic 300 is connected to the inner side of the cover 100, the pole assembly 200 is connected to the connecting piece 400 through the avoidance hole 310, and a positioning column 320 is provided on the side of the lower plastic 300 away from the cover 100, and the connecting piece 400 is provided with a positioning groove 410. When the connecting piece 400 is welded with the pole assembly 200, the positioning column 320 is located in the positioning groove 410 to play a positioning and anti-rotation effect, thereby avoiding the displacement of the connecting piece 400 during welding. Furthermore, an embossed layer 420 is provided on the side of the connecting piece 400 away from the lower plastic 300 to distinguish the two sides of the connecting piece 400, so as to distinguish the front and back sides of the connecting piece 400, thereby avoiding the connecting piece 400 from being installed upside down during welding.

[0040] In one embodiment, the embossed layer 420 is a circular or polygonal structure. In this embodiment, the embossed layer 420 is a circular structure, that is, one side of the connecting piece 400 is a plane, and the other side is a circular embossed layer 420, so that the two sides of the connecting piece 400 are distinguished, so as to facilitate identification of the front and back sides of the connecting piece 400 during welding.

[0041] Furthermore, in other embodiments, the embossed layer 420 may also be a special-shaped structure such as an arc or an irregular shape.

[0042] like Figure 3 and Figure 4 As shown, in one embodiment, the number of the positioning posts 320 is two, the number of the positioning grooves 410 is two, and each positioning post 320 is correspondingly located in a corresponding positioning groove 410. In this embodiment, the two positioning grooves 410 and the two positioning posts 320 cooperate with each other to achieve a better positioning effect between the connecting piece 400 and the lower plastic 300.

[0043] like Figure 4 As shown, in one embodiment, the lower plastic 300 is provided with a reinforcing rib 330 along the lengthwise edge. It is understood that when the battery is in thermal runaway, the internal air pressure and temperature are too high, and the reinforcing rib 330 is provided along the lengthwise edge of the lower plastic 300 to improve the structural strength of the lower plastic 300 and prevent the heat-melting surface of the lower plastic 300 from collapsing.

[0044] like Figure 1 and Figure 4As shown, in one embodiment, the battery cover structure 10 further includes an explosion-proof valve 500, the cover 100 is provided with an explosion-proof hole 120, the explosion-proof valve 500 is located in the explosion-proof hole 120 and connected to the cover 100, the lower plastic 300 is provided with a plurality of exhaust holes 340, and the plurality of exhaust holes 340 are evenly distributed in the middle of the lower plastic 300. It can be understood that when the battery is in thermal runaway, the internal air pressure and temperature are too high, and when the air pressure reaches a critical value, the gas passes through the exhaust holes 340 and the explosion-proof hole 120 to open the explosion-proof valve 500 to prevent the battery from exploding.

[0045] like Figure 4 As shown, in one embodiment, each of the exhaust holes 340 is elliptical. It can be understood that the exhaust holes 340 are elliptical so that the multiple exhaust holes 340 are distributed more reasonably in the middle of the lower plastic 300, thereby increasing the exhaust effect inside the battery.

[0046] like Figure 1 and Figure 5 As shown, in one embodiment, the pole assembly 200 includes a pole 210, an insulating plastic part 220 and a sealing ring 230, the insulating plastic part 220 is connected to the cover plate 100, the insulating plastic part 220 is provided with a mounting groove, the mounting groove is communicated with the mounting hole 110, one end of the pole 210 is connected to the connecting piece 400, the other end of the pole 210 passes through the avoidance hole 310, the mounting hole 110 and the mounting groove in sequence and is connected to the insulating plastic part 220, the sealing ring 230 is located in the mounting hole 110 and abuts against the pole 210. It can be understood that the pole 210 passes through the cover 100, the sealing ring 230 and the lower plastic 300 and is connected to the connecting piece 400, so that the pole 210 is connected to the battery cell through the connecting piece 400, the sealing ring 230 is located in the mounting hole 110 to play a sealing role, and the insulating plastic part 220 is located on the outside of the cover 100, and the insulating plastic part 220 is respectively connected to the pole 210 and the cover 100 to play an insulating and fixing role.

[0047] like Figure 4 As shown, in one embodiment, the lower plastic 300 is further provided with an observation hole 350, the observation hole 350 is connected to the avoidance hole 310, and the observation hole 350 is arranged corresponding to the sealing ring 230. It can be understood that the observation hole 350 is located below the sealing ring 230, and whether the sealing ring 230 is missing can be observed through the observation hole 350 to improve the product yield.

[0048] like Figure 1As shown, in one embodiment, the battery cover structure 10 further includes a sealing nail 600, and the cover 100 is provided with a liquid injection hole 130, and the sealing nail 600 is located in the liquid injection hole 130 and connected to the cover 100. It can be understood that after the battery is assembled, it is necessary to inject electrolyte into the battery through the liquid injection hole 130 so that the electrolyte infiltrates the battery cell. After the injection is completed, the sealing nail 600 is inserted into the liquid injection hole 130, and the sealing nail 600 is welded to the hole wall of the liquid injection hole 130 so that the sealing nail 600 is fixed to the cover 100.

[0049] The present application also provides a square battery, comprising the battery cover structure 10 described in any of the above embodiments.

[0050] Compared with the prior art, the present invention has at least the following advantages:

[0051] 1. In the above-mentioned battery cover structure 10, the lower plastic 300 is connected to the inner side of the cover 100, the pole assembly 200 is connected to the connecting piece 400 through the avoidance hole 310, and a positioning column 320 is provided on the side of the lower plastic 300 away from the cover 100. The connecting piece 400 is provided with a positioning groove 410. When the connecting piece 400 is welded to the pole assembly 200, the positioning column 320 is located in the positioning groove 410 to achieve positioning and anti-rotation effects, thereby avoiding displacement of the connecting piece 400 during welding.

[0052] 2. In the battery cover structure 10, the side of the connecting piece 400 facing away from the lower plastic 300 is provided with an embossed layer 420 to differentiate the two sides of the connecting piece 400, so as to facilitate identification of the front and back sides of the connecting piece 400, thereby preventing the connecting piece 400 from being installed upside down during welding.

[0053] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be based on the attached claims.

Claims

1. A battery cover structure, comprising a cover, a pole assembly, a lower plastic and a connecting piece, wherein the cover is provided with a mounting hole, the pole assembly is located in the mounting hole and connected to the cover, the lower plastic is connected to the inner side of the cover, the lower plastic is provided with an avoidance hole, the avoidance hole is connected to the mounting hole, a part of the pole assembly structure passes through the avoidance hole and is connected to the connecting piece, one side of the connecting piece is arranged adjacent to the middle of the lower plastic, characterized in that: A positioning column is provided on one side of the lower plastic away from the cover plate, and a positioning groove is provided on the connecting piece. The positioning column is located in the positioning groove so that the connecting piece abuts against the lower plastic, and an embossed layer is provided on one side of the connecting piece away from the lower plastic.

2. The battery cover structure according to claim 1, characterized in that: The embossed layer has a circular or polygonal structure.

3. The battery cover structure according to claim 1, characterized in that: The number of the positioning posts is two, the number of the positioning slots is two, and each positioning post is located in a corresponding positioning slot.

4. The battery cover structure according to claim 1, characterized in that: The lower plastic is provided with reinforcing ribs along the edge of the length direction.

5. The battery cover structure according to claim 1, characterized in that: The battery cover structure also includes an explosion-proof valve. The cover is provided with an explosion-proof hole. The explosion-proof valve is located in the explosion-proof hole and connected to the cover. The lower plastic is provided with a plurality of exhaust holes, which are evenly distributed in the middle of the lower plastic.

6. The battery cover structure according to claim 5, characterized in that: Each of the exhaust holes is in an elliptical shape.

7. The battery cover structure according to claim 1, characterized in that: The pole assembly includes a pole, an insulating plastic part and a sealing ring. The insulating plastic part is connected to the cover plate. The insulating plastic part is provided with a mounting groove, and the mounting groove is communicated with the mounting hole. One end of the pole is connected to the connecting piece, and the other end of the pole passes through the avoidance hole, the mounting hole and the mounting groove in sequence and is connected to the insulating plastic part. The sealing ring is located in the mounting hole and abuts against the pole.

8. The battery cover structure according to claim 7, characterized in that: The lower plastic is also provided with an observation hole, the observation hole is communicated with the avoidance hole, and the observation hole is arranged corresponding to the sealing ring.

9. The battery cover structure according to claim 1, characterized in that: The battery cover structure also includes a sealing nail. The cover is provided with a liquid injection hole. The sealing nail is located in the liquid injection hole and connected to the cover.

10. A square battery, characterized in that: A battery cover structure comprising any one of claims 1 to 9.

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