Battery top cover and battery with same

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a battery. The battery top cover comprises a cover plate, a riveting block and a connecting pin, a through hole is formed in the cover plate in a penetrating mode, the riveting block is installed on the cover plate, a riveting hole is formed in the riveting block in a penetrating mode, the riveting hole is oppositely formed in the through hole, the opening section of the through hole is gradually increased in the direction away from the cover plate, and a protruding part is arranged on the connecting pin. The protruding part sequentially penetrates through the through hole and the riveting hole and is riveted with the riveting block. According to the battery top cover, the protruding parts are used for replacing the pole columns, the structure of the pole columns and the assembling process of the pole columns are omitted while it is guaranteed that the riveting blocks can be electrically connected with the battery cell, the structure and the process of the whole battery top cover are simplified, the production and manufacturing cost is reduced, and the production efficiency is improved; and the risk that the connecting pins fall off can be reduced to zero, so that the production quality of the battery top cover and the use safety and reliability of the battery are effectively improved.

Description

Technical Field

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

[0002] At present, industries such as new energy vehicles, electrochemical energy storage, and power tools are developing rapidly, and the demand for power batteries is becoming increasingly strong. The battery top cover is an important component of the power battery, mainly including the pole, top cover sheet, rivet block and sealing ring. The traditional battery top cover processing technology is to preset the pole hole on the cover of the battery, add the various components of the pole into the pole hole in turn, and then assemble the pole and the top cover sheet by riveting the sealing ring through the rivet block. Due to the large number of structural parts, the assembly process is relatively cumbersome, which will lead to errors in the production process, resulting in low production efficiency and high production costs.

[0003] Based on the above, there is an urgent need for a battery top cover and a battery having the same to solve the technical problems existing in the prior art. Utility Model Content

[0004] One purpose of the utility model is to provide a battery top cover, which can reduce production costs and ensure production efficiency and quality.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A battery top cover comprises a cover plate, a rivet block and a connecting pin, wherein the cover plate is provided with a through hole, the rivet block is mounted on the cover plate, and the rivet block is provided with a rivet hole, the rivet hole is arranged relative to the through hole, and the opening cross-section of the through hole gradually increases in a direction away from the cover plate, and the connecting pin is provided with a protrusion, the protrusion is sequentially penetrated through the through hole and the rivet hole, and is riveted to the rivet block.

[0007] Preferably, the vertical cross-section of the riveting hole is in the shape of an inverted cone.

[0008] Preferably, the riveting hole includes a guide hole and a variable-section hole, the guide hole is closer to the cover plate than the variable-section hole, the vertical cross-section shape of the guide hole is a straight cylinder, the protrusion is limitedly inserted in the guide hole, and the opening cross-section of the variable-section hole gradually increases in the direction away from the cover plate.

[0009] Preferably, the riveting block is provided with the variable-section hole and the guide hole formed by stamping.

[0010] Preferably, the horizontal cross-sectional shapes of the riveting hole and the protrusion are both circular.

[0011] Preferably, the connecting pin is provided with the protrusion formed by stamping.

[0012] Preferably, the connecting pin is in an L-shaped structure and comprises a first connecting portion and a second connecting portion, wherein the first connecting portion is parallel to the cover plate, and the protrusion is protruding from the surface of the first connecting portion, and the second connecting portion is perpendicular to the cover plate.

[0013] Preferably, the connecting pin comprises a positive connecting pin and a negative connecting pin, and the positive connecting pin and the negative connecting pin are both provided with the protrusion, and the riveting block comprises a positive riveting block and a negative riveting block, and the positive riveting block and the negative riveting block are both provided with the riveting hole.

[0014] Preferably, the cover includes a cover body, an insulating lower plastic, an insulating upper plastic and a sealing ring, the lower side of the cover body is connected to the insulating lower plastic, the insulating upper plastic is sandwiched between the upper side of the cover body and the rivet block, the sealing ring is sleeved on the protrusion, and the protrusion is sequentially penetrated into the insulating lower plastic, the cover body and the insulating upper plastic, and then riveted to the rivet block.

[0015] Another object of the present invention is to provide a battery, which can reduce production costs and improve safety and reliability during use by using the above-mentioned battery top cover.

[0016] To achieve this purpose, the utility model adopts the following technical solutions:

[0017] A battery comprises a battery cell and the above-mentioned battery top cover, wherein the battery cell comprises a pole ear, the battery top cover is arranged on one end of the battery cell having the pole ear, and the connecting pin is connected to the pole ear.

[0018] Beneficial effects of the utility model:

[0019] The utility model provides a battery top cover, in which connecting pins are assembled from bottom to top, and a protrusion replaces the function of a traditional pole, while ensuring that a riveting block can be electrically connected to a battery cell, the pole structure and the process of assembling the pole are omitted, which not only simplifies the structure and process of the entire battery top cover, reduces the production cost, and improves the production efficiency, but also because the connecting pins are riveted to the riveting block, the risk of the connecting pins falling off can be reduced to zero, thereby effectively improving the production quality of the battery top cover.

[0020] The utility model also provides a battery, which is equipped with the above-mentioned battery top cover. Since the arrangement of the pole is omitted in the above-mentioned battery top cover, the rivet block is only riveted through the protrusion on the connecting pin, which not only simplifies the structure of the entire battery, saves production costs, and improves the efficiency of the battery production process, but also can significantly reduce the risk of the connecting pin falling off, making the use of the entire battery safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the battery top cover provided by an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the explosion structure of the battery top cover provided by the embodiment of the utility model;

[0023] Figure 3 It is a top view of the battery top cover provided by the embodiment of the utility model;

[0024] Figure 4 is a cross-sectional view of a battery top cover provided by an embodiment of the utility model;

[0025] Figure 5 yes Figure 4 A partial enlarged view of the middle A;

[0026] Figure 6 It is a structural cross-sectional view of a riveting block provided by an embodiment of the utility model.

[0027] In the figure:

[0028] 1. Cover plate; 11. Cover plate body; 12. Insulation lower plastic; 13. Insulation upper plastic; 14. Sealing ring;

[0029] 2. Riveting block; 201. Riveting hole; 2011. Guide hole; 2012. Variable cross-section hole; 21. Positive electrode riveting block; 22. Negative electrode riveting block;

[0030] 3. Connecting pin; 301. Protruding portion; 302. First connecting portion; 303. Second connecting portion; 31. Positive connecting pin; 32. Negative connecting pin. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] At present, the new energy vehicle, electrochemical energy storage, power tools and other industries are developing rapidly, and the demand for power batteries is becoming more and more vigorous. As one of the power batteries, lithium-ion power batteries have entered the stage of large-scale use. Square lithium-ion batteries include battery casings, battery top covers, battery cells and other components. Among them, the battery cell can be composed of pole pieces (including positive pole pieces and negative pole pieces) and current collectors. The pole pieces are provided with pole ears (including positive pole ears and negative pole ears). The battery cell is placed inside the battery casing, and the battery cell is connected to the battery top cover through the lead-out pole ears. The battery top cover is then sealed with the battery casing to form a battery.

[0036] The assembly of the battery top cover is as follows: the column of the pole (positive pole or negative pole) passes through the lower plastic, the cover plate and the upper plastic and then is riveted to the rivet block, which is provided to facilitate the electrical connection with the copper busbar. However, due to the large number of structural parts of the battery top cover currently produced, the assembly process is relatively cumbersome, which will lead to errors in the production process, resulting in low production efficiency and high production costs.

[0037] Based on the above problems, this embodiment provides a battery top cover, which can realize the connection between the riveting block 2 and the copper busbar without the need for a pole, thereby reducing some structural parts of the battery top cover, reducing production costs, and helping to improve production efficiency and quality.

[0038] Specifically, combined Figures 1 to 6 As shown, the battery top cover includes a cover plate 1, a riveting block 2 and a connecting pin 3. Among them, a through hole is formed on the cover plate 1, and the riveting block 2 is installed on the upper surface of the cover plate 1, and a riveting hole 201 is formed on the riveting block 2, and the riveting hole 201 is arranged relative to the through hole, and the opening cross-section of the through hole gradually increases along the direction away from the cover plate 1, and the connecting pin 3 is connected to the battery cell, and a protrusion 301 is protruding on the connecting pin 3, and the protrusion 301 is sequentially penetrated through the through hole and the riveting hole 201, and is riveted to the riveting block 2. The protrusion 301 can be formed by stamping, so that the forming efficiency of the protrusion 301 can be effectively improved, and the mass production of the above-mentioned connecting pin 3 can be achieved while reducing the production cost.

[0039] In this embodiment, the connecting pin 3 is assembled from bottom to top, and the protrusion 301 replaces the role of the traditional pole. While ensuring that the riveting block 2 can be electrically connected to the battery cell, the pole structure and the process of assembling the pole are omitted, which not only simplifies the structure and process of the entire battery top cover, reduces the production cost and improves the production efficiency, but also because the connecting pin 3 is riveted to the riveting block 2, the risk of the connecting pin 3 falling off can be reduced to zero, thereby effectively improving the production quality of the battery top cover.

[0040] Further, refer to Figure 6 As shown, the vertical cross-sectional shape of the riveting hole 201 is an inverted cone, that is, a cross-sectional shape that is wide at the top and narrow at the bottom. Since the opening of the inverted cone-shaped riveting hole 201 gradually decreases from top to bottom, the protrusion 301 can gradually fit tightly with the hole wall during the riveting process, thereby increasing the fit between the protrusion 301 and the riveting block 2 at the connection and reducing the gap.

[0041] Furthermore, combined with Figure 2 , Figure 3 As shown, the horizontal cross-sectional shapes of the rivet hole 201 and the protrusion 301 are both circular. The circular rivet hole 201 and the circular protrusion 301 are easier to process and manufacture than other shapes. In addition, during the riveting process, the protrusion 301 with a circular cross-sectional shape can be better deformed and fit closely with the rivet hole 201, further reducing the possibility of gap generation.

[0042] Specifically, in this embodiment, continue to refer to Figure 6As shown, the rivet hole 201 includes a guide hole 2011 and a variable-section hole 2012. The guide hole 2011 is closer to the cover plate 1 than the variable-section hole 2012. The vertical cross-sectional shape of the guide hole 2011 is a straight cylinder. The protrusion 301 is inserted into the guide hole 2011 in a limited position. In the direction away from the cover plate 1, the opening cross-sectional area of ​​the variable-section hole 2012 gradually increases. The rivet block 2 can be formed by stamping the above-mentioned variable-section hole 2012 and the guide hole 2011, so that the required shape and size of the variable-section hole 2012 and the guide hole 2011 can be accurately controlled according to the requirements, ensuring a good connection effect, and also ensuring the forming efficiency, so that the rivet block 2 can be mass-produced.

[0043] In this embodiment, when the protrusion 301 is inserted into the rivet block 2 from bottom to top, it will first pass through the guide hole 2011 closer to the cover plate 1. The inner wall of the guide hole 2011 is tightly connected to the outer wall of the protrusion 301, which can ensure that the protrusion 301 is inserted into the rivet hole 201 along the vertical direction.

[0044] In addition, it should be noted that if the inner side walls of the rivet hole 201 are all set as bevels, the opening edge of the rivet hole 201 at the bottom will be sharper. In the process of the protrusion 301 penetrating upward, the opening edge of the rivet hole 201 will be worn to produce metal chips. The metal chips may form an additional circuit path in the battery, causing unnecessary high voltage in the battery system, and may also change the circuit resistance, resulting in additional resistance during the flow of current, causing poor circuit resistance, and thus seriously affecting the performance of the battery. In this embodiment, by providing a guide hole 2011 with a straight edge segment, the possibility of the opening edge of the rivet hole 201 being worn can be eliminated, thereby effectively improving the safety performance of the battery.

[0045] Specifically, in this embodiment, the cover 1 includes a cover body 11, an insulating lower plastic 12, an insulating upper plastic 13 and a sealing ring 14, wherein the lower side of the cover body 11 is connected to the insulating lower plastic 12, the insulating upper plastic 13 is sandwiched between the upper side of the cover body 11 and the rivet block 2, and the sealing ring 14 is sleeved on the protrusion 301. The protrusion 301 penetrates the insulating lower plastic 12, the cover body 11 and the insulating upper plastic 13 in sequence, and is riveted to the rivet block 2. During the specific assembly, the cover body 11 and the insulating lower plastic 12 are first assembled, and the sealing ring 14 is sleeved in the through hole of the cover body 11, and then the riveting block 2 and the insulating upper plastic 13 are placed, and the connecting pin 3 connects the cover body 11, the insulating upper plastic 13, the insulating lower plastic 12, the sealing ring 14 and the riveting block 2 in series through the protrusion 301, and finally the upper surface of the protrusion 301 is pressed by a tool to form a riveted surface in the riveting hole 201 of the riveting block 2. The sealing ring 14 will be compressed at the same time during the riveting to form a sealing effect, ensuring the good airtightness of the battery top cover.

[0046] It is worth noting that, in the present embodiment, the connecting pin 3 includes a positive connecting pin 31 and a negative connecting pin 32. Correspondingly, the rivet block 2 includes a positive rivet block 21 and a negative rivet block 22. The assembly method between the positive connecting pin 31 and the positive rivet block 21, and between the negative connecting pin 32 and the negative rivet block 22 can all adopt the above-mentioned assembly method, which is conducive to better reducing the production cost of the battery top cover and improving production efficiency and quality.

[0047] Of course, in other embodiments, the protrusion 301 may be provided only on the positive electrode connection pin 31, or the protrusion 301 may be provided only on the negative electrode connection pin 32, so that the above-mentioned assembly method is provided only at the positive electrode or the negative electrode of the battery to meet the needs under specific working conditions, and the present invention is not limited to this.

[0048] Specifically, in this embodiment, taking the positive electrode connection pin 31 as an example, the positive electrode connection pin 31 is L-shaped and includes a first connection portion 302 and a second connection portion 303. The first connection portion 302 is parallel to the cover body 11, and a protrusion 301 is protruded on the surface of the first connection portion 302. The second connection portion 303 is perpendicular to the cover body 11 to ensure that a good connection effect can be achieved between the second connection portion 303 and the battery cell. It can be understood that the negative electrode connection pin 32 has the same structure as the positive electrode connection pin 31 and can play the same role as the positive electrode connection pin 31, so its structure will not be described in detail.

[0049] This embodiment also provides a battery, including a battery shell with an opening, a battery cell installed in the battery shell, and the above-mentioned battery top cover, wherein the battery top cover is arranged on the opening to seal the battery cell in the battery shell, and the connecting pin 3 in the battery top cover is connected to the pole ear on the battery cell. Since the battery is equipped with the above-mentioned battery top cover, and the pole is omitted in the above-mentioned battery top cover, the rivet block 2 is only riveted by the protrusion 301 on the connecting pin 3, which not only simplifies the structure of the entire battery, saves production costs, and improves the efficiency of the battery production process, but also can significantly reduce the risk of the connecting pin 3 falling off, making the use of the entire battery safer and more reliable.

[0050] In the description of this specification, the description of reference terms such as "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery cover, characterized in that: The invention comprises a cover plate (1), a rivet block (2) and a connecting pin (3), wherein the cover plate (1) is provided with a through hole, the rivet block (2) is mounted on the cover plate (1), and the rivet block (2) is provided with a rivet hole (201), the rivet hole (201) is arranged relative to the through hole, and the opening cross-section of the through hole gradually increases in a direction away from the cover plate (1), and the connecting pin (3) is provided with a protrusion (301), the protrusion (301) is sequentially penetrated through the through hole and the rivet hole (201), and is riveted to the rivet block (2).

2. The battery top cover according to claim 1, characterized in that: The vertical cross-section of the riveting hole (201) is in the shape of an inverted cone.

3. The battery top cover according to claim 2, characterized in that: The riveting hole (201) comprises a guide hole (2011) and a variable-section hole (2012); the guide hole (2011) is closer to the cover plate (1) than the variable-section hole (2012); the vertical cross-section of the guide hole (2011) is a straight cylinder; the protrusion (301) is inserted into the guide hole (2011) in a limited manner; and the opening cross-section of the variable-section hole (2012) gradually increases in a direction away from the cover plate (1).

4. The battery top cover according to claim 3, characterized in that: The riveting block (2) is provided with the variable-section hole (2012) and the guide hole (2011) formed by stamping.

5. The battery top cover according to claim 1, characterized in that: The horizontal cross-sectional shapes of the riveting hole (201) and the protruding portion (301) are both circular.

6. The battery top cover according to claim 1, characterized in that: The connecting pin (3) is provided with the protruding portion (301) formed by stamping.

7. The battery top cover according to claim 1, characterized in that: The connecting pin (3) has an L-shaped structure and comprises a first connecting portion (302) and a second connecting portion (303), wherein the first connecting portion (302) is parallel to the cover plate (1), and the protruding portion (301) is protrudingly provided on the surface of the first connecting portion (302), and the second connecting portion (303) is perpendicular to the cover plate (1).

8. The battery top cover according to any one of claims 1 to 7, characterized in that: The connecting pin (3) comprises a positive connecting pin (31) and a negative connecting pin (32), and the positive connecting pin (31) and the negative connecting pin (32) are both provided with the protruding portion (301). The riveting block (2) comprises a positive riveting block (21) and a negative riveting block (22), and the positive riveting block (21) and the negative riveting block (22) are both provided with the riveting hole (201).

9. The battery top cover according to any one of claims 1 to 7, characterized in that: The cover plate (1) comprises a cover plate body (11), an insulating lower plastic (12), an insulating upper plastic (13) and a sealing ring (14); the lower side of the cover plate body (11) is connected to the insulating lower plastic (12); the insulating upper plastic (13) is sandwiched between the upper side of the cover plate body (11) and the riveting block (2); the sealing ring (14) is sleeved on the protruding portion (301); the protruding portion (301) is inserted into the insulating lower plastic (12), the cover plate body (11) and the insulating upper plastic (13) in sequence, and then is riveted to the riveting block (2).

10. A battery, characterized in that It comprises a battery cell and a battery top cover as claimed in any one of claims 1 to 9, wherein the battery cell comprises a pole lug, the battery top cover is arranged on one end of the battery cell having the pole lug, and the connecting pin (3) is connected to the pole lug.

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