Battery cover plate and battery

Abstract

The utility model relates to the technical field of new energy batteries, in particular to a battery cover plate and a battery, and aims to solve the problems that in the existing power battery production, an insulating part is limited to rotate relative to the side wall of a battery pole mounting hole by adopting a limiting mode of arranging a limiting clamping groove and a limiting bulge; and the use performance of the battery is reduced due to low limiting effect. The battery comprises a top cover piece, a battery pole piece and an insulating sleeve, the top cover sheet is provided with a pole hole and a pole cover edge arranged around the pole hole, and the inner side wall of the pole hole is provided with an annular step; the battery pole piece is arranged in the pole hole in a penetrating manner; one part of the battery pole piece is propped against the annular step and is insulated from the annular step; a polygonal limiting boss is arranged in an area, close to the pole hole, of the pole cover edge, and a limiting part is arranged on one side, far away from the pole hole, of the pole cover edge; the insulating sleeve is mounted on the outer side of the battery pole piece; and a polygonal limiting bulge is arranged on the insulating sleeve in a position corresponding to the limiting boss. The battery cover plate is high in strength, and the use performance of the battery is good.

Description

Technical Field

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

[0002] Power batteries are widely used in the field of battery vehicles. They have the characteristics of high power and high current, which put forward higher requirements on the safety and cost of batteries. At present, the reliability and safety of power batteries are also a technical difficulty and focus in the production process of large-capacity power batteries, especially the high insulation shoes and high sealing of the batteries during the production process. In order to avoid the short circuit between the battery pole and the battery cover, the prior art often adopts the use of insulating parts for insulation isolation. At the same time, the battery poles of existing power batteries mostly adopt a cylindrical structure. In order to improve the sealing between the battery pole and the battery cover, a limit slot is opened on the side wall of the battery mounting hole of the battery cover and a corresponding limit protrusion is set on the insulating part to achieve a stable connection between the insulating part and the side wall of the battery mounting hole.

[0003] Although this type of limiting process can improve the insulation and sealing of the battery to a certain extent, after the battery has been used for a certain period of time, the insulating part will appear due to the stress during use, resulting in a decrease in the limiting effect, causing the insulating part and the side wall of the battery mounting hole to rotate relative to each other, and even the battery pole to rotate, resulting in a decrease in the battery performance. The main reason is that due to the miniaturization production requirements of power batteries, the thickness of the side wall of the battery pole mounting hole needs to be reduced in adaptability. Therefore, when setting a limiting slot on the inner side of the side wall, in order not to affect the overall strength of the side wall of the battery pole mounting hole, the groove depth of the limiting slot and the protrusion height of the limiting protrusion need to be reduced in adaptability, thereby resulting in a decrease in the limiting effect between the insulating part and the side wall of the battery pole mounting hole. Therefore, a battery cover is needed to solve the problem that in the existing power battery production, the limiting method of setting a limiting slot and a limiting protrusion is used to limit the rotation of the insulating part relative to the side wall of the battery pole mounting hole, and the limiting effect is low, resulting in a decrease in the battery performance. Utility Model Content

[0004] The utility model aims to provide a battery cover and a battery, which can effectively solve the problem that the existing power battery adopts a limiting method of setting a limiting slot and a limiting protrusion to limit the rotation of the insulating part relative to the side wall of the battery pole mounting hole, and the limiting effect is low, resulting in a decrease in battery performance.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A battery cover plate comprises a top cover sheet, a battery pole piece and an insulating sleeve; the top cover sheet is provided with a pole hole and a pole cover edge arranged around the pole hole, and the inner side wall of the pole hole is provided with an annular step; the battery pole piece is inserted into the pole hole, and a part of the battery pole piece stops on the annular step and is insulated from the annular step; a polygonal limiting boss is provided in the area of ​​the pole cover edge adjacent to the pole hole, and a limiting portion is provided on the side of the pole cover edge away from the pole hole, which is used to limit the movement of the battery pole piece in a direction away from the pole hole; the insulating sleeve is installed on the outside of the battery pole piece, and a polygonal limiting protrusion is provided at a position on the insulating sleeve corresponding to the limiting boss, so as to limit the relative rotation of the insulating sleeve and the pole cover edge.

[0007] The limiting portion of the pole cover edge is a rolled limiting flange formed by bending the pole cover edge body inwardly and abutting against the battery pole piece.

[0008] Wherein, a limiting convex ring is provided at a position of the battery pole piece corresponding to the rolled limiting flange.

[0009] The insulating sleeve is provided with a mounting groove matched with the limiting convex ring, and the insulating sleeve is sleeved on the outer side of the limiting convex ring of the battery pole component through the mounting groove.

[0010] The insulating sleeve extends inwardly toward one side of the rolled limiting flange to form a flange insulating portion sandwiched between the rolled limiting flange and the limiting convex ring.

[0011] Among them, the battery cover is also provided with an insulating pad; the insulating pad is clamped between the limiting convex ring and the annular step.

[0012] Wherein, the insulating pad is provided with a sleeve portion which abuts against the inner side wall of the annular step.

[0013] Among them, the limiting boss has a regular octagonal structure in cross section; the polygonal limiting protrusion on the insulating sleeve has a regular octagonal structure in cross section.

[0014] The battery pole piece is located at one end of the pole hole and extends toward the pole hole to form a connecting portion for connecting with the battery cell pole ear.

[0015] The present application also provides a battery, including a shell, a battery cell and a battery cover. One end of the shell is open, the battery cell is installed in the shell, and the battery cover is buckled on the open end of the shell.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] 1. The battery cover provided in the above technical solution adopts a pole hole and a pole cover edge arranged around the pole hole on the top cover sheet of the battery, wherein the pole hole is provided with an annular step and the pole cover edge is provided with a limiting portion. The battery pole is inserted into the pole hole, and the battery pole is fixed by limiting the upper part of the battery pole and stopping the bottom. In order to improve the insulation and sealing of the battery pole and the pole cover edge. The present application installs the outer side of the battery pole piece by first installing the insulating sleeve, and arranges a polygonal limiting boss on the pole cover edge, and at the same time arranges a polygonal limiting protrusion at a position corresponding to the limiting boss on the insulating sleeve to limit the relative rotation of the insulating sleeve and the pole cover edge. The present application is limited by the limiting boss on the pole cover edge and the limiting protrusion on the insulating sleeve, and is not subject to the existing power battery miniaturization production requirements, which leads to the reduction of the thickness of the side wall of the battery pole installation hole, that is, the pole cover edge of the present application, and does not need to be grooved on the pole cover edge, so it will not affect the strength of the pole cover edge. The friction between the insulating sleeve of the present application and the edge of the pole cover is large, and the connection stability is high.

[0018] 2. On the basis of the above, the present application adopts the method of bending the top area of ​​the pole cover edge inwards through the riveting process to abut against the rolled limit flange on the battery pole piece, and setting a limit convex ring at the position corresponding to the rolled limit flange of the battery pole piece, which is used to radially limit the battery pole, so as to improve the stable installation of the battery pole and the battery pole and the insulating sleeve. Considering the insulation problem between the rolled limit flange and the battery pole, the present application sets a mounting groove that cooperates with the limit convex ring through the insulating sleeve, and the insulating sleeve is sleeved on the outside of the limit convex ring of the battery pole piece through the mounting groove, and the insulating sleeve is extended inward toward one side of the rolled limit flange to form a flange insulation part sandwiched between the rolled limit flange and the limit convex ring, so as to improve the insulation and avoid short circuit between the battery pole piece and the pole cover edge.

[0019] 3. Based on the above, the present application provides an insulating pad; the insulating pad is clamped between the limiting convex ring and the annular step to achieve insulation between the battery pole and the annular step.

[0020] 4. Based on the above, the present application adopts a limiting boss and a limiting protrusion with a regular octagonal cross-section to improve the limiting performance while increasing the torque between the insulating sleeve and the edge of the pole cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an exploded view of the structure of the battery cover of this embodiment;

[0022] Figure 2 is a cross-sectional view of the rolling limit flange of the battery cover of this embodiment when it is not bent;

[0023] Figure 3 It is a cross-sectional view of the battery cover plate of this embodiment after the rolling limiting flange is bent. DETAILED DESCRIPTION

[0024] In order to make the purpose and advantages of the utility model more clear, the utility model is specifically described in combination with the following embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the utility model, and does not strictly limit the protection scope of the specific request of the utility model.

[0025] See also Figure 1-Figure 3 The technical solution adopted by the present application is shown in the figure, a battery cover plate, including a top cover sheet 9, a battery pole piece 1 and an insulating sleeve 4; the top cover sheet 9 is provided with a pole hole 5 and a pole cover edge 2 arranged around the pole hole, and the inner side wall of the pole hole is provided with an annular step; the battery pole piece 1 is passed through the pole hole 5, and a part of the battery pole piece stops on the annular step and is insulated from the annular step; a limiting boss 3 with a regular octagonal structure in cross section is provided in the area of ​​the pole cover edge 2 adjacent to the pole hole, and a limiting portion is provided on the side of the pole cover edge away from the pole hole, which is used to limit the movement of the battery pole piece in a direction away from the pole hole; the insulating sleeve 4 is installed on the outside of the battery pole piece, and a limiting protrusion with a regular octagonal structure in cross section is provided at a position on the insulating sleeve corresponding to the limiting boss to limit the relative rotation of the insulating sleeve and the pole cover edge.

[0026] The limiting portion of the pole cover edge 2 of this embodiment is a rolled limiting flange 7 on the battery pole member after the pole cover body is bent inward. A limiting convex ring 8 is provided at a position of the battery pole member 1 corresponding to the rolled limiting flange 7. In addition, the insulating sleeve 4 of the present application is provided with a mounting groove that cooperates with the limiting convex ring, and the insulating sleeve 4 is sleeved on the outside of the limiting convex ring 8 of the battery pole member through the mounting groove. The insulating sleeve extends inward toward one side of the rolled limiting flange to form a flange insulating portion sandwiched between the rolled limiting flange and the limiting convex ring.

[0027] Furthermore, the battery cover of this embodiment is further provided with an insulating pad 6, which is sandwiched between the limiting protruding ring 8 and the annular step, and the insulating pad 6 is provided with a sleeve portion that abuts against the inner side wall 10 of the annular step.

[0028] The battery pole piece of the present embodiment is located at one end of the pole hole and extends toward the pole hole to form a connecting portion for connecting with the battery cell pole ear.

[0029] This embodiment also provides a battery, including a shell, a battery cell and a battery cover. One end of the shell is open, the battery cell is installed in the shell, and the battery cover is buckled on the open end of the shell.

[0030] Working principle: The battery of this embodiment has the aforementioned battery cover plate, and the pole hole opened on the top cover plate of the battery cover plate is used to penetrate the battery pole. The upper end of the pole cover edge surrounding the pole hole is rolled and bent inwards by the rotary riveting process to form a rolled limit flange abutting against the battery pole piece. A limit convex ring is provided at the position of the battery pole piece corresponding to the rolled limit flange, and an annular step is provided at the bottom of the pole hole. The battery pole piece is installed in the pole hole by the limit of the rolled limit flange and the annular step. The stable installation of the battery pole can be ensured. At the same time, in order to avoid the short circuit between the battery pole piece and the pole cover edge, the present embodiment is provided with an insulating sleeve sleeved on the outer side of the limit convex ring of the battery pole piece for insulation treatment, wherein the insulating sleeve extends inwards toward one side of the rolled limit flange to form a flange insulation part sandwiched between the rolled limit flange and the limit convex ring to improve the insulation. In addition, the battery cover of this embodiment is also provided with an insulating pad, and a sleeve portion is provided on the insulating pad to achieve insulation between the battery pole piece and the annular step. The battery of this embodiment can effectively reduce the relative rotation between the insulating sleeve, the battery pole piece and the pole cover edge, and reduce the short circuit between the battery pole piece and the pole cover edge, thereby improving the insulation and sealing of the battery and improving the reliability of the battery.

[0031] The implementation methods of the present application are described in detail above in conjunction with the embodiments, but the present application is not limited to the above-mentioned implementation methods. For ordinary technicians in this technical field, after knowing the contents recorded in the present application, they can make several equivalent changes and substitutions thereto without departing from the principles of the present application, and these equivalent changes and substitutions should also be regarded as belonging to the protection scope of the present application.

Claims

1. A battery cover, comprising a top cover, a battery pole piece and an insulating sleeve; characterized in that: The top cover sheet is provided with a pole hole and a pole cover edge arranged around the pole hole, and the inner side wall of the pole hole is provided with an annular step; the battery pole piece is inserted into the pole hole, and a part of the battery pole piece stops on the annular step and is insulated from the annular step; a polygonal limiting boss is provided in the area of ​​the pole cover edge adjacent to the pole hole, and a limiting portion is provided on the side of the pole cover edge away from the pole hole, which is used to limit the movement of the battery pole piece in the direction away from the pole hole; the insulating sleeve is installed on the outside of the battery pole piece, and a polygonal limiting protrusion is provided at a position on the insulating sleeve corresponding to the limiting boss to limit the relative rotation of the insulating sleeve and the pole cover edge.

2. A battery cover according to claim 1, characterized in that: The limiting portion of the pole cover edge is a rolling limiting flange that is formed by bending the pole cover edge body inwards and abutting against the battery pole piece.

3. A battery cover according to claim 2, characterized in that: A limiting convex ring is provided at a position of the battery pole piece corresponding to the rolled limiting flange.

4. A battery cover according to claim 3, characterized in that: The insulating sleeve is provided with a mounting groove matched with the limiting convex ring, and the insulating sleeve is sleeved on the outer side of the limiting convex ring of the battery pole member through the mounting groove.

5. A battery cover according to claim 4, characterized in that: The insulating sleeve extends inwardly toward one side of the rolled limiting flange to form a flange insulating portion sandwiched between the rolled limiting flange and the limiting convex ring.

6. A battery cover according to claim 3, characterized in that: The battery cover is also provided with an insulating pad; the insulating pad is clamped between the limiting convex ring and the annular step.

7. A battery cover according to claim 6, characterized in that: The insulating pad is provided with a sleeve portion abutting against the inner side wall of the annular step.

8. The battery cover according to claim 1, characterized in that: The limiting boss has a regular octagonal cross section; the polygonal limiting protrusion on the insulating sleeve has a regular octagonal cross section.

9. The battery cover according to claim 1, characterized in that: The battery pole piece is located at one end of the pole hole and extends toward the pole hole to form a connecting portion for connecting with the battery cell pole ear.

10. A battery, comprising a housing, a battery cell and a battery cover as claimed in any one of claims 1 to 9, characterized in that: One end of the shell is open, the battery core is installed in the shell, and the battery cover is buckled on the open end of the shell.

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