Battery cell and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell and a battery. The utility model provides a battery cell which comprises a current collecting disc, and a through hole penetrating through the current collecting disc in the thickness direction of the current collecting disc is formed in the current collecting disc; in the thickness direction of the current collecting plate, the current collecting plate is provided with a first groove area which is sunken towards one side, the through hole is formed in the range of the first groove area, a second sunken area which is sunken in the same direction as the first sunken area is arranged in the first groove area, a boss is formed on one side of the sunken direction of the second sunken area, and a first step is arranged on the edge of the first sunken area; the sealing plug can be inserted into the through hole so as to seal the through hole of the flow collecting disc; the edge of the cover plate is provided with a third step matched with the first step, the first step and the third step can be connected in a sealed mode, and the first sunken area is sunken towards the side away from the direction of the cover plate. According to the utility model, gas generated in the formation process can be exhausted in time, and adverse effects on the battery cell caused by excessive gas generated in the formation stage are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a kind of battery cell and battery. BACKGROUND

[0002] At present, cylindrical battery adopts the process of closed formation, that is, battery is injected liquid and completely sealed before formation, and the scheme of formation. The gas generated in the process of formation cannot be discharged in time. If the battery cell produces more gas in the formation stage and cannot be discharged in time, the internal pressure will rise to a certain extent, which will push the Vent (explosion-proof valve) to turn over. The turning of the Vent will generate a pulling force, which will act on the welding point of the CID (current interrupt device). The welding point will be pulled off, and the internal circuit will be cut off, thereby preventing the current from continuing to pass through, resulting in the battery cell being scrapped. SUMMARY

[0003] In view of the technical problem that the battery cell produces more gas in the formation stage and cannot be discharged in time in the prior art, the utility model provides a battery cell and battery, which can discharge the gas generated in the formation process in time and avoid the adverse effects of excessive gas production in the formation stage on the battery cell.

[0004] The utility model provides a kind of battery cell, including current collector plate, current collector plate is set with the through hole along the thickness direction of current collector plate and penetrates current collector plate;Along the thickness direction of current collector plate, current collector plate is provided with the first recessed groove area recessed to one side, the through hole is arranged in the range of the first recessed groove area, the first recessed groove area is provided with the second recessed area recessed in the same direction with the first recessed area, the side of the recessed direction of the second recessed area forms boss, and the edge of the first recessed area is provided with the first step;Sealing plug, sealing plug can be inserted in the through hole to seal the through hole of current collector plate;Cover plate, the edge of cover plate is provided with the third step matched with the first step, and the first step and the third step can be sealedly connected, and the side of the first recessed area away from cover plate is recessed.

[0005] Further, it further includes roll core, along the thickness direction of current collector plate, roll core is arranged on the side of current collector plate away from cover plate, and roll core is weldedly connected with current collector plate.

[0006] Further, it further includes shell, and the edge of current collector plate is provided with the second step matched with shell, and the second step is weldedly connected with shell.

[0007] Further, the through hole is arranged in the middle part of the current collector plate, and the number of the second recessed areas is multiple, and the second recessed areas are arranged in a circumferential array with the through hole as the center.

[0008] Further, the cover plate includes a cover plate main body and a cover plate thinning area, the cover plate thinning area is arranged in the middle part of the cover plate, the thickness of the cover plate thinning area is less than the thickness of the cover plate main body, and the cover plate thinning area is processed with a notch to form an explosion-proof valve.

[0009] Further, the third groove is arranged on the side of the cover plate thinning area away from the current collector plate.

[0010] Further, the third groove is arranged on the side of the cover plate thinning area away from the current collector plate.

[0011] Further, the third groove is arranged on the side of the cover plate thinning area away from the current collector plate.

[0012] Further, the third groove is arranged on the side of the cover plate thinning area away from the current collector plate.

[0013] The utility model provides still a kind of battery, including above-mentioned electric core.

[0014] The utility model has the advantages that:

[0015] The cooperation of the current collector plate and the sealing plug enables the electric core to be formed before being completely sealed, and after liquid injection of the electric core is completed, the sealing plug is placed before formation to ensure the sealing effect of the electric core, and after formation is completed, the sealing plug is removed, and the welding sealing of the cover plate and the current collector plate is carried out, so that the gas generated in the formation process is discharged in time, and the adverse effects of excessive gas generation in the formation stage on the electric core are avoided.

[0016] The design of the first recessed area and the second recessed area enables the current collector plate to be more fully contacted when being welded with the roll core, and reduces the phenomenon of virtual welding when being welded.The cooperation of the cover plate and the current collector plate enables the first step and the third step to be assembled to further form a groove, for injecting UV glue to carry out secondary sealing, and reduces the risk of liquid leakage of the electric core. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without creative labor on the premise of not paying creative labor.

[0018] Figure 1 It is a structure exploded view of one embodiment of the utility model;

[0019] Figure 2 It is a structure schematic view of one embodiment of the current collector plate;

[0020] Figure 3Structure schematic view of one embodiment of the current collector plate;

[0021] Figure 4 Structure schematic view of one embodiment of the cover plate;

[0022] Figure 5 Exploded view of one embodiment of the utility model;

[0023] Figure 6 Structure schematic view of one embodiment of the utility model.

[0024] Main figure mark explanation:

[0025] 1-current collector plate, 11-first groove area, 12-second groove area, 121-welding line, 13-through hole, 14-boss, 15-first step, 151-groove, 16-second step, 2-sealing plug, 21-connection part, 22-limiting part, 3-cover plate, 31-cover plate thinning area, 311-scarf, 32-explosion-proof valve patch, 331-third step, 332-third groove, 4-winding core, 5-housing. DETAILED DESCRIPTION

[0026] In order to make the person skilled in the art better understand the technical scheme in the utility model, the technical scheme in the utility model embodiment will be described clearly and completely in combination with the drawings in the utility model embodiment below. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0027] As shown in Figures 1-4 The utility model provides a kind of electric core, including current collector plate 1, sealing plug 2 and cover plate 3, current collector plate 1 is equipped with through hole 13 along the thickness direction of current collector plate 1 through current collector plate 1, through hole 13 is liquid injection hole, liquid is injected into electric core by through hole 13, after the liquid injection of electric core is completed, sealing plug 2 is placed before formation, to guarantee the sealing effect of electric core, after formation is completed, sealing plug 2 is removed, and the welding sealing of cover plate 3 and current collector plate 1 is carried out.

[0028] Along the thickness direction of the current collector plate 1, the current collector plate 1 is provided with a first recessed area 11 recessed to one side, specifically, the recessed direction of the first recessed area 11 is the direction of the current collector plate 1 away from the cover plate 3, the through hole 13 is arranged in the range of the first recessed area 11, in the preferred embodiment, the through hole 13 is arranged at the geometric center position of the current collector plate 1, the shape of the first recessed area 11 is a regular geometric shape, for example, a circular or square shape, the through hole 13 is also located in the middle area of the first recessed area 11, the number of the second recessed areas is multiple, and the second recessed areas are arranged in a circular peripheral array with the through hole 13 as the center. The first recessed area 11 is provided with a second recessed area recessed in the same direction as the first recessed area, specifically, the recessed direction of the second recessed area 12 is the direction of the current collector plate 1 away from the cover plate 3, as shown in Figure 1 and Figure 2 , the second recessed area is used for welding with the winding core 4, as shown in Figure 5 , the boss 14 can make the current collector plate 1 contact more fully when welding with the winding core 4, avoiding the occurrence of false welding. The edge of the first recessed area is provided with a first step 15, and the edge of the cover plate 3 is provided with a third step 331 matched with the first step 15. By the first step 15 and the third step 331, the cover plate 3 and the current collector plate 1 are assembled and then welded and connected, and at the same time, the sealing of the UV glue is carried out. The cover plate 3 is used in cooperation with the current collector plate 1. The depth of the first step 15 is greater than that of the third step 331. After the assembly of the first step 15 and the third step 331, a groove 151 is further formed, which is used for injecting the UV glue for secondary sealing, thereby reducing the risk of liquid leakage of the battery cell. Figures 5-6 As shown in , the battery cell further includes a shell 5, and the edge of the current collector plate 1 is provided with a second step 16 matched with the shell 5, and the second step 16 is welded and connected with the shell 5.

[0029] As shown in Figure 4 , the cover plate 3 includes a cover plate 3 main body and a cover plate thinning area 31. A circular thinning area is processed in the middle of the cover plate 3. The thickness of the cover plate thinning area 31 is less than that of the cover plate 3 main body. The cover plate thinning area 31 is processed with a notch 311 to form a pressure relief valve. The side of the cover plate thinning area 31 away from the current collector plate 1 thus forms a third recess 332. When the internal pressure increases due to abnormal or short circuit conditions inside the battery, the pressure relief valve breaks, releasing the pressure, and ensuring that the battery cell will not explode. A pressure relief valve patch 32 is placed above the cover plate thinning area 31. The material of the pressure relief valve patch 32 can be PET, PVC or other plastic materials. The pressure relief valve patch 32 is single-sidedly coated with adhesive and is installed in the third recess 332 of the cover plate thinning area 31 to protect the internal pressure relief valve from being easily contaminated or damaged.

[0030] In one embodiment, the through hole 13 is a circular hole, the number of the second recessed areas is six, and the second recessed areas are arranged in a circular peripheral array with the through hole 13 as the center; the sealing plug 2 comprises a connecting portion 21 and a limiting portion 22, the connecting portion 21 is in the shape of a circular truncated cone or a circular cone, and the size of the cross section of the connecting portion 21 gradually increases in the direction from the current collecting disc 1 to the cover plate 3; in the direction from the cover plate 3 to the current collecting disc 1, the projection of the limiting portion 22 on the current collecting disc 1 can cover the through hole 13. In one embodiment, the through hole 13 is a square hole, the number of the second recessed areas is six, and the second recessed areas are arranged in a circular peripheral array with the through hole 13 as the center; the sealing plug 2 comprises a connecting portion 21 and a limiting portion 22, the connecting portion 21 is in the shape of a prismatic truncated cone or a prismatic cone, and the size of the cross section of the connecting portion 21 gradually increases in the direction from the current collecting disc 1 to the cover plate 3; in the direction from the cover plate 3 to the current collecting disc 1, the projection of the limiting portion 22 on the current collecting disc 1 can cover the through hole 13. In other embodiments, the number of the second recessed areas can also be other numbers, such as three, four, five, seven, eight, etc. In the direction from the current collecting disc 1 to the cover plate 3, the size of the sealing plug 2 gradually increases, the sealing plug 2 is inserted into the through hole 13, the sealing plug 2 is in interference fit with the through hole 13 so that the sealing plug 2 seals the through hole 13, and the sealing plug 2 can be made of a material with sealing effect, such as fluororubber or EPDM (ethylene propylene diene rubber). The limiting portion 22 limits the limit position of the sealing plug 2, and the projection area of the limiting portion 22 in the direction of the current collecting disc 1 is greater than the area of the through hole 13, so as to play a limiting role.

[0031] An embodiment of the utility model also provides a battery which comprises the above-mentioned battery cell.

[0032] Although the utility model has been described in detail with reference to the drawings and in conjunction with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, those skilled in the art can make various equivalent modifications or replacements to the embodiments of the utility model, and these modifications or replacements should be within the scope of the utility model. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, and these changes or replacements should be within the protection scope of the utility model.

Claims

1. A battery cell, characterized in that, include The collector plate has a through hole extending through the collector plate along its thickness direction; along the thickness direction of the collector plate, the collector plate has a first recessed groove area recessed to one side, the through hole is located within the range of the first recessed groove area, a second recessed area recessed in the same direction as the first recessed area is provided in the first recessed area, a boss is formed on one side of the second recessed area in the recessed direction, and a first step is provided on the edge of the first recessed area; A sealing plug, which can be inserted into the through hole to seal the through hole of the manifold; The cover plate has a third step on its edge that is adapted to the first step and the first step and the third step can be sealed together. The first recessed area is recessed to the side away from the cover plate.

2. A battery cell as described in claim 1, characterized in that, It also includes a core, which is located on the side of the collector plate facing away from the cover plate along the thickness direction of the collector plate, and the core is welded to the collector plate.

3. A battery cell as described in claim 1, characterized in that, It also includes a housing, and the edge of the collector plate is provided with a second step that is adapted to the housing. The second step is welded to the housing.

4. A battery cell as described in claim 1, characterized in that, The through hole is located in the middle of the collector plate, and there are multiple second recessed areas arranged in a circular array with the through hole as the center.

5. A battery cell as described in claim 1, characterized in that, The cover plate includes a cover plate body and a cover plate thinning area. The cover plate thinning area is located in the middle of the cover plate. The thickness of the cover plate thinning area is less than the thickness of the cover plate body. The cover plate thinning area is machined with grooves to form an explosion-proof valve.

6. A battery cell as described in claim 5, characterized in that, A third groove is provided on the side of the cover plate thinning area facing away from the collector plate.

7. A battery cell as described in claim 6, characterized in that, An explosion-proof valve patch is fitted into the third groove.

8. A battery cell as described in claim 1, characterized in that, The through hole is a round hole, and the sealing plug includes a connecting part and a limiting part. The connecting part is in the shape of a frustum or a cone. The cross-sectional size of the connecting part gradually increases along the direction from the collector plate to the cover plate. Along the direction from the cover plate to the collector plate, the projection of the limiting part on the collector plate can cover the through hole.

9. A battery cell as described in claim 1, characterized in that, The through hole is a square hole, and the sealing plug includes a connecting part and a limiting part. The connecting part is in the shape of a frustum or a pyramid. Along the direction from the collector plate to the cover plate, the cross-sectional size of the connecting part gradually increases. Along the direction from the cover plate to the collector plate, the projection of the limiting part on the collector plate can cover the through hole.

10. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-9.

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