Battery cover plate and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises a cover plate body, a conductive pole, a sealing element and a pressing ring, the cover plate body is provided with a pole through hole, a first coating part and a second coating part through punch forming, and the first coating part and the second coating part jointly form a containing groove. The conductive pole is accommodated in the accommodating groove in an insulating manner, the conductive pole comprises a pole main body and a connecting part, the sealing element is sleeved on the connecting part, the compression ring is sleeved on the connecting part and is connected with the cover plate body, and the sealing element is compressed between the compression ring and the conductive pole. The cover plate body is processed through a stamping process, the precision of the stamping process is more precise than that of an edge rolling process, so that the processing error is greatly reduced, the yield is improved, the pressing ring connected with the cover plate body is arranged on the connecting part of the conductive pole in a sleeving manner, the conductive pole can be fixed, and a sealing element can be compressed; the stability of the structure is ensured, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cover and a battery. Background Technology

[0002] As a crucial component of lithium batteries, the battery cover's structural design not only affects the battery's basic performance, such as capacity and charge / discharge efficiency, but also directly relates to its safety and long-term reliability. The main structural components of the battery cover include conductive electrode posts, a plain aluminum plate, insulating components, and sealing components.

[0003] To facilitate the fixed connection of the conductive electrode posts, insulating components, and sealing components to the aluminum plate, a rolling edge process is usually used to process the aluminum plate, thereby creating a hollow protruding structure on the aluminum plate. The insulating components, sealing components, and conductive electrode posts are all fixedly connected inside the protruding structure, thus facilitating the fixed connection of the conductive electrode posts, insulating components, and sealing components to the aluminum plate.

[0004] However, the inner and outer diameters of the raised structure produced by the rolling edge process are unstable, resulting in large processing errors, which leads to a low yield rate and poor product quality of the battery cover. Utility Model Content

[0005] The purpose of this utility model is to provide a battery cover and battery with high processing precision, high yield, and good product quality.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On one hand, a battery cover is provided, the battery cover comprising:

[0008] The cover plate body is stamped and formed with an electrode through hole, a first covering part and a second covering part. The first covering part is continuously arranged around the circumferential edge of the electrode through hole. The first covering part extends along the direction close to the central axis of the electrode through hole to form the second covering part. The first covering part and the second covering part together constitute a receiving groove.

[0009] A conductive electrode post is insulated and housed in the receiving groove. The conductive electrode post includes an electrode post body and a connecting part. The connecting part is connected to the side of the electrode post body away from the second covering part. The outer diameter of the electrode post body is larger than the outer diameter of the connecting part, so as to form a first limiting step surface at the junction of the electrode post body and the connecting part.

[0010] A sealing element, which is sleeved on the connecting portion and abuts against the first limiting step surface;

[0011] A pressure ring is fitted onto the connecting portion and connected to the cover plate body. The sealing element is compressed between the pressure ring and the first limiting step surface.

[0012] Optionally, the cover plate body is riveted to the edge of the pole post through hole and has a fixing part that is connected to the pressure ring.

[0013] Optionally, the pressure ring has a connecting groove near the edge of the pole through hole for accommodating the fixing part.

[0014] Optionally, the pressure when riveting the cover plate body to the pressure ring is F, and F > 1000N.

[0015] Optionally, the fixing part is welded to the pressure ring.

[0016] Optionally, the pole body includes a plug-in portion and a limiting portion, the limiting portion being connected between the plug-in portion and the connecting portion, the diameter of the plug-in portion being larger than that of the connecting portion and smaller than that of the limiting portion, a second limiting step surface being formed between the plug-in portion and the limiting portion, the second limiting step surface abutting against the second covering portion.

[0017] Optionally, the battery cover further includes an insulating member, which is sandwiched between the limiting portion and the first covering portion, and between the insertion portion and the second covering portion.

[0018] Optionally, the insulating member includes a first insulating part, a second insulating part, and a third insulating part. The first insulating part has a through hole and is sandwiched between the limiting part and the second covering part. The second insulating part is continuously disposed along the circumferential edge of the through hole and is sandwiched between the insertion part and the second covering part. The third insulating part is continuously disposed along the circumferential edge outside the first insulating part and is sandwiched between the limiting part and the first covering part.

[0019] Optionally, the sealing element includes a first sealing part and a second sealing part. The first sealing part has an insertion through hole for the connection part to be inserted. The second sealing part is continuously arranged along the circumferential edge of the insertion through hole. The first sealing part is sandwiched between the pressure ring and the pole body, and the second sealing part is sandwiched between the connection part and the pressure ring.

[0020] On the other hand, a battery is also provided, the battery including a battery housing, an electrode assembly, and a battery cover as described in any of the preceding claims, the battery cover enclosing the battery housing to form a receiving cavity for accommodating the electrode assembly.

[0021] The beneficial effects of this utility model are:

[0022] This utility model provides a battery cover plate, which includes a cover plate body, conductive electrode posts, a sealing element, and a pressure ring. The electrode post through holes, a first covering part, and a second covering part are formed on the cover plate body by a stamping process. Since the stamping process is more precise than the rolling process, the processing error is greatly reduced and the yield rate is improved. Furthermore, the pressure ring connected to the cover plate body is sleeved on the connecting part of the conductive electrode post, which can fix the conductive electrode post and compress the sealing element, ensuring the stability of the structure and improving the product quality.

[0023] This utility model also provides a battery, which includes a battery casing, an electrode assembly, and a battery cover. By applying the aforementioned battery cover, the quality of the finished product after the battery cover and battery casing are assembled is effectively improved due to the increased precision of the battery cover, thus increasing the product yield. Attached Figure Description

[0024] Figure 1 This is a structural cross-sectional view of the battery cover provided by this utility model;

[0025] Figure 2 yes Figure 1 Enlarged view of the structure of section G in the middle;

[0026] Figure 3 This is a partial structural cross-sectional view of the cover body in the battery cover provided by this utility model;

[0027] Figure 4 This is a front view of the conductive electrode post in the battery cover provided by this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the sealing element in the battery cover provided by this utility model;

[0029] Figure 6 This is a cross-sectional view of the pressure ring in the battery cover provided by this utility model;

[0030] Figure 7 This utility model provides a cross-sectional view of the insulating component in the battery cover.

[0031] In the picture:

[0032] 1. Cover plate body; 11. Through hole of pole post; 12. First covering part; 13. Second covering part; 14. Receiving groove; 15. Fixing part;

[0033] 2. Conductive electrode post; 21. Electrode post body; 211. Insertion part; 212. Limiting part; 213. Second limiting step surface; 22. Connecting part; 23. First limiting step surface;

[0034] 3. Sealing element; 31. First sealing part; 32. Second sealing part; 33. Insertion through hole;

[0035] 4. Pressure ring; 41. Connecting groove;

[0036] 5. Insulating component; 51. First insulating part; 52. Second insulating part; 53. Third insulating part; 54. Through hole. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] As a crucial component of lithium batteries, the battery cover's structural design not only affects the battery's basic performance, such as capacity and charge / discharge efficiency, but also directly relates to its safety and long-term reliability. The main structural components of the battery cover include conductive electrode posts, a plain aluminum plate, insulating components, and sealing components.

[0042] To facilitate the fixed connection of the conductive electrode posts, insulating components, and sealing components to the aluminum plate, a rolling edge process is usually used to process the aluminum plate, thereby creating a hollow protruding structure on the aluminum plate. The insulating components, sealing components, and conductive electrode posts are all fixedly connected inside the protruding structure, thus facilitating the fixed connection of the conductive electrode posts, insulating components, and sealing components to the aluminum plate.

[0043] However, the inner and outer diameters of the raised structure produced by the rolling edge process are unstable, resulting in large processing errors, which leads to a low yield rate and poor product quality of the battery cover.

[0044] Therefore, in order to improve processing accuracy, increase product yield, and improve product quality, this embodiment provides a battery cover.

[0045] like Figures 1 to 7 As shown, the battery cover includes a cover body 1, conductive electrode posts 2, a sealing element 3, and a pressure ring 4. The cover body 1 is stamped with an electrode post through hole 11, a first covering part 12, and a second covering part 13. The first covering part 12 is continuously arranged around the circumferential edge of the electrode post through hole 11. The first covering part 12 extends along a direction close to the central axis of the electrode post through hole 11 to form the second covering part 13. The first covering part 12 and the second covering part 13 together constitute a receiving groove 14. The conductive electrode posts 2 are insulated and housed in the receiving groove 14. The electrode post 2 includes an electrode post body 21 and a connecting part 22. The connecting part 22 is connected to the side of the electrode post body 21 away from the second covering part 13. The outer diameter of the electrode post body 21 is larger than the outer diameter of the connecting part 22, so as to form a first limiting step surface 23 at the junction of the electrode post body 21 and the connecting part 22. The sealing member 3 is sleeved on the connecting part 22 and abuts against the first limiting step surface 23. The pressure ring 4 is sleeved on the connecting part 22 and connected to the cover plate body 1. The sealing member 3 is compressed between the pressure ring 4 and the first limiting step surface 23.

[0046] The battery cover includes a cover body 1, conductive electrode posts 2, a sealing element 3, and a pressure ring 4. Through-holes 11 for the electrode posts, a first covering part 12, and a second covering part 13 are formed on the cover body 1 by a stamping process. Since the stamping process is more precise than the rolling process, the processing error is greatly reduced and the yield rate is improved. Furthermore, the pressure ring 4, which is connected to the cover body 1, is sleeved on the connecting part 22 of the conductive electrode posts 2, which can fix the conductive electrode posts 2 and compress the sealing element 3, ensuring the stability of the structure and improving the product quality.

[0047] In this embodiment, the terminal through-hole 11, the first covering part 12, and the second covering part 13 are formed simultaneously during stamping. Depending on the battery type, the number of terminal through-holes 11, the first covering part 12, and the second covering part 13 formed on the cover plate body 1 is also different. When the battery type is a blade battery or a cylindrical battery, a set of terminal through-holes 11, the first covering part 12, and the second covering part 13 are formed on the cover plate body 1 through the stamping process. When the battery type is a prismatic battery, two sets of terminal through-holes 11, the first covering part 12, and the second covering part 13 are formed through the stamping process, corresponding to the positive electrode and the negative electrode, respectively.

[0048] Optionally, such as Figure 1 and Figure 2 As shown, the cover plate body 1 has a fixing part 15 riveted to the edge of the pole through hole 11, which is connected to the pressure ring 4. By riveting the edge of the pole through hole 11, the material of the cover plate body 1 located at the edge of the pole through hole 11 is squeezed, so that a part of the material is pressed onto the pressure ring 4 under pressure. This part of the material is the fixing part 15. The fixing part 15 formed by this riveting method can realize the connection and fixation between the pressure ring 4 and the cover plate body 1.

[0049] Optionally, the pressure when riveting the cover plate body 1 and the pressure ring 4 is F, and F > 1000N. By ensuring that the riveting pressure is greater than 1000N, it is possible to ensure that the fixing part 15 formed by riveting has sufficient material on the one hand, and to ensure the structural strength after the fixing part 15 and the pressure ring 4 are connected on the other hand.

[0050] Optionally, such as Figure 6 As shown, a connecting groove 41 for accommodating the fixing part 15 is provided on the edge of the pressure ring 4 near the through hole 11 of the pole post. By providing a connecting groove 41 for accommodating the fixing part 15 on the pressure ring 4, a part of the fixing part 15 can be more easily integrated into the pressure ring 4, thereby improving the connection strength after riveting and ensuring the strength of the connection between the pressure ring 4 and the cover plate body 1.

[0051] Optionally, the fixing part 15 is welded to the pressure ring 4. By welding the fixing part 15 to the pressure ring 4, the connection strength between the fixing part 15 and the pressure ring 4 is further improved on the basis of riveting, thereby preventing the fixing part 15 from separating from the pressure ring 4, which would prevent the pressure ring 4 from being unable to fix the remaining structure on the battery cover. If the riveting pressure between the cover body 1 and the pressure ring 4 is less than 1000N, welding must be used to assist in the connection and fixation between the fixing part 15 and the pressure ring 4.

[0052] Optionally, such as Figure 4As shown, the pole body 21 includes a plug-in portion 211 and a limiting portion 212. The limiting portion 212 is connected between the plug-in portion 211 and the connecting portion 22. The diameter of the plug-in portion 211 is larger than that of the connecting portion 22 and smaller than that of the limiting portion 212. A second limiting step surface 213 is formed between the plug-in portion 211 and the limiting portion 212. The second limiting step surface 213 abuts against the second covering portion 13. The electrode body 21 is formed by the insertion part 211 and the limiting part 212. The diameter of the insertion part 211 is larger than that of the connecting part 22 and smaller than that of the limiting part 212. This makes the shape of the electrode body 21 more compatible with the space inside the receiving groove 14 formed by the first covering part 12 and the second covering part 13, which facilitates the insertion of the cover plate body 1 and the conductive electrode post 2. Since the diameter of the insertion part 211 is larger than that of the connecting part 22 and smaller than that of the limiting part 212, a second limiting step surface 213 is formed between the insertion part 211 and the limiting part 212. The second limiting step surface 213 abuts against the second covering part 13, thereby limiting the relative position between the conductive electrode post 2 and the cover plate body 1 and preventing the conductive electrode post 2 from shifting towards the second covering part 13.

[0053] In this embodiment, the conductive electrode post 2 is manufactured using an integral molding process, such as casting, to simultaneously form the insertion part 211, the limiting part 212, and the connecting part 22 of the conductive electrode post 2 of the electrode post body 21.

[0054] Optionally, such as Figure 1 and Figure 4 As shown, the battery cover also includes an insulating member 5. The insulating member 5 is sandwiched between the limiting portion 212 and the first covering portion 12, and between the insertion portion 211 and the second covering portion 13. By sandwiching the insulating member 5 between the limiting portion 212 and the first covering portion 12, and between the insertion portion 211 and the second covering portion 13, direct contact between the cover body 1 and the conductive electrode post 2, preventing a short circuit, and ensuring the insulation of the battery cover. In this embodiment, the insulating member 5 is a rubber sleeve made of rubber material, which provides insulation protection by covering the outside of the conductive electrode post 2.

[0055] Optionally, such as Figure 4 and Figure 7As shown, the insulating component 5 includes a first insulating portion 51, a second insulating portion 52, and a third insulating portion 53. The first insulating portion 51 has a through hole 54 and is sandwiched between the limiting portion 212 and the second covering portion 13. The second insulating portion 52 is continuously disposed along the circumferential edge of the through hole 54 and is sandwiched between the insertion portion 211 and the second covering portion 13. The third insulating portion 53 is continuously disposed along the outer circumferential edge of the first insulating portion 51 and is sandwiched between the limiting portion 212 and the first covering portion 12. By sandwiching the first insulating portion 51 between the limiting portion 212 and the second covering portion 13, the second insulating portion 52 between the insertion portion 211 and the second covering portion 13, and the third insulating portion 53 between the limiting portion 212 and the first covering portion 12, the insulating component 5 is ensured to have a large insulating area, avoiding direct contact between the conductive electrode post 2 and the cover plate body 1, thus preventing short circuits and providing high insulation protection performance. In this embodiment, the insulating component 5 can be manufactured by injection molding.

[0056] Optionally, such as Figure 5 As shown, the sealing element 3 includes a first sealing part 31 and a second sealing part 32. The first sealing part 31 has an insertion through hole 33 for the connection part 22 to be inserted. The second sealing part 32 is continuously arranged along the circumferential edge of the insertion through hole 33. The first sealing part 31 is sandwiched between the pressure ring 4 and the electrode body 21, and the second sealing part 32 is sandwiched between the connection part 22 and the pressure ring 4. By sandwiching the first sealing part 31 between the pressure ring 4 and the electrode body 21, and the second sealing part 32 between the connection part 22 and the pressure ring 4, a double sealing effect is achieved, expanding the sealing area. This allows the sealing element 3 to seal all gaps between the conductive electrode post 2 and the pressure ring 4, preventing electrolyte leakage from the cover plate body 1.

[0057] In this embodiment, a battery is also provided, comprising a battery casing, electrode assembly, and the aforementioned battery cover. The battery cover encloses the battery casing to form a cavity for accommodating the electrode assembly. By applying the aforementioned battery cover, the improved precision of the battery cover effectively enhances the quality of the finished product after assembly of the battery cover and battery casing, thereby increasing the product yield.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery cover, characterized in that, The battery cover includes: The cover plate body (1) is stamped with an pole post through hole (11), a first covering part (12) and a second covering part (13). The first covering part (12) is continuously arranged around the circumferential edge of the pole post through hole (11). The first covering part (12) extends along the direction close to the central axis of the pole post through hole (11) to form the second covering part (13). The first covering part (12) and the second covering part (13) together constitute a receiving groove (14). Conductive electrode post (2), the conductive electrode post (2) is insulatedly housed in the receiving groove (14), the conductive electrode post (2) includes an electrode post body (21) and a connecting part (22), the connecting part (22) is connected to the side of the electrode post body (21) away from the second covering part (13), the outer diameter of the electrode post body (21) is larger than the outer diameter of the connecting part (22) to form a first limiting step surface (23) at the junction of the electrode post body (21) and the connecting part (22); A sealing element (3) is sleeved on the connecting part (22) and abuts against the first limiting step surface (23); A pressure ring (4) is fitted onto the connecting part (22) and connected to the cover plate body (1). The sealing element (3) is compressed between the pressure ring (4) and the first limiting step surface (23).

2. The battery cover according to claim 1, characterized in that, The cover plate body (1) has a fixing part (15) riveted to the edge of the pole through hole (11) and connected to the pressure ring (4).

3. The battery cover according to claim 2, characterized in that, The pressure ring (4) has a connecting groove (41) near the edge of the pole through hole (11) for accommodating the fixing part (15).

4. The battery cover according to claim 2, characterized in that, The pressure when riveting the cover plate body (1) and the pressure ring (4) is F, and F > 1000N.

5. The battery cover according to claim 2, characterized in that, The fixing part (15) is welded to the pressure ring (4).

6. The battery cover according to claim 1, characterized in that, The pole body (21) includes a plug-in portion (211) and a limiting portion (212). The limiting portion (212) is connected between the plug-in portion (211) and the connecting portion (22). The diameter of the plug-in portion (211) is larger than that of the connecting portion (22) and smaller than that of the limiting portion (212). A second limiting step surface (213) is formed between the plug-in portion (211) and the limiting portion (212). The second limiting step surface (213) abuts against the second covering portion (13).

7. The battery cover according to claim 6, characterized in that, The battery cover also includes an insulating member (5), and the insulating member (5) is sandwiched between the limiting part (212) and the first covering part (12) and between the insertion part (211) and the second covering part (13).

8. The battery cover according to claim 7, characterized in that, The insulating member (5) includes a first insulating part (51), a second insulating part (52) and a third insulating part (53). The first insulating part (51) has a through hole (54) and is sandwiched between the limiting part (212) and the second covering part (13). The second insulating part (52) is continuously arranged along the circumferential edge of the through hole (54) and is sandwiched between the plug-in part (211) and the second covering part (13). The third insulating part (53) is continuously arranged along the circumferential edge outside the first insulating part (51) and is sandwiched between the limiting part (212) and the first covering part (12).

9. The battery cover according to claim 1, characterized in that, The sealing element (3) includes a first sealing part (31) and a second sealing part (32). The first sealing part (31) has an insertion through hole (33) for the connection part (22) to be inserted. The second sealing part (32) is continuously arranged along the circumferential edge of the insertion through hole (33). The first sealing part (31) is sandwiched between the pressure ring (4) and the pole body (21). The second sealing part (32) is sandwiched between the connection part (22) and the pressure ring (4).

10. A battery, characterized in that, The battery includes a battery casing, an electrode assembly, and a battery cover as described in any one of claims 1-9, wherein the battery cover closes the battery casing to form a receiving cavity for accommodating the electrode assembly.

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