Cell top cover and battery

Abstract

The present application relates to the technical field of lithium batteries, and provides a cell top cover and a battery. Specifically, the cell top cover comprises a cover plate, upper terminal posts and lower terminal posts. Terminal post holes for accommodating the upper terminal posts and the lower terminal posts are formed on the cover plate; a portion of each upper terminal post protrudes downwards to form a first recess, a portion of each lower terminal post protrudes upwards to form a second recess, and the bottom wall of the first recess is connected to the bottom wall of the corresponding second recess. On the basis of the described configuration of the first and second recesses, the weight of each upper terminal post and the weight of each lower terminal post are reduced respectively, resulting in material savings for the upper and lower terminal posts; thus, lightweight design of the cell top cover is achieved, and the manufacturing cost of the cell top cover is also reduced.

Description

A cell top cover and a battery

[0001] Cross-references to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 2024208445816, filed on April 22, 2024, entitled “A Cell Top Cover and a Battery”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of lithium battery technology, and more specifically, to a cell top cover and a battery. Background Technology

[0004] A power battery generally includes a casing and a top cover assembly that covers the top opening of the casing. The top cover assembly includes a top cover plate and terminals. The top cover plate has terminal mounting holes for the corresponding positive and negative terminals to be assembled.

[0005] However, in related technologies, the positive and negative terminals are generally solid structures, which are heavy and costly.

[0006] Utility Model Content

[0007] The purpose of this disclosure is to provide a cell top cover and a battery that can reduce the weight of the upper and lower terminals and save on the materials used for the upper and lower terminals.

[0008] The embodiments of this disclosure are implemented as follows:

[0009] In a first aspect, this disclosure provides a battery cell top cover, including a cover plate, an upper electrode post, and a lower electrode post; the cover plate has electrode post holes for accommodating the upper electrode post and the lower electrode post; the upper electrode post partially protrudes downward to form a first groove, and the lower electrode post partially protrudes upward to form a second groove, and the bottom wall of the first groove is connected to the bottom wall of the second groove.

[0010] In an optional embodiment, the opening end of the first groove faces opposite directions to the opening end of the second groove, and the outer side of the bottom wall of the first groove is connected to the outer side of the bottom wall of the second groove.

[0011] In an optional implementation, the bottom wall of the first groove has the same dimensions as the bottom wall of the second groove.

[0012] In an optional embodiment, the opening end of the first groove and the opening end of the second groove face the same direction, and the outer side of the bottom wall of the first groove is connected to the inner side of the bottom wall of the second groove.

[0013] In an optional embodiment, the bottom wall dimension of the first groove is smaller than that of the second groove, and the sidewalls of the first groove are connected to the sidewalls of the second groove.

[0014] In an optional embodiment, the sidewall of the first groove is provided with a first threaded portion, and the sidewall of the second groove is provided with a second threaded portion that mates with the first threaded portion.

[0015] In an optional embodiment, the bottom wall of the first groove is welded or bonded to the bottom wall of the second groove.

[0016] In an optional implementation, both the upper and lower poles are made of aluminum.

[0017] In an optional implementation, the upper electrode post is made of aluminum and the lower electrode post is made of copper-aluminum composite material.

[0018] In an optional embodiment, the top cover of the battery cell further includes an upper insulating member and a lower insulating member connected to the two sides opposite to the cover plate, respectively; the upper insulating member is configured to insulate the upper electrode post and the cover plate, and is also configured to insulate the upper electrode post and the outer metal; the lower insulating member is configured to insulate the lower electrode post and the cover plate, and is also configured to insulate the lower electrode post and the core.

[0019] In optional embodiments, the lower insulation element is designed as an integral or separate structure.

[0020] In an optional embodiment, the cell top cover further includes a seal disposed between the upper and lower insulating members.

[0021] In an optional embodiment, the cover plate has a pressure relief hole, and the top cover of the battery cell also includes an explosion-proof valve welded to the wall of the pressure relief hole, and a protective patch that cooperates with the explosion-proof valve.

[0022] In an optional implementation, the protective patch has a flat sheet structure.

[0023] Secondly, this disclosure provides a battery including a cell top cover as described in any of the foregoing embodiments.

[0024] The beneficial effects of the embodiments disclosed herein include:

[0025] This application provides a battery cell top cover and a battery. The battery cell top cover includes a cover plate, an upper electrode post, and a lower electrode post. The cover plate has electrode post holes for accommodating the upper and lower electrode posts. A portion of the upper electrode post protrudes downward to form a first groove, and a portion of the lower electrode post protrudes upward to form a second groove, with the bottom wall of the first groove connected to the bottom wall of the second groove. Based on the aforementioned first and second grooves, the weight of the upper and lower electrode posts is reduced, saving material and achieving a lightweight design for the battery cell top cover. This also reduces the manufacturing cost of the top cover; it reduces the number of components (e.g., rivet blocks), simplifying the structure; and it facilitates assembly, improving manufacturing efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 is a first-view schematic diagram of the battery cell top cover provided in an embodiment of this disclosure;

[0028] Figure 2 is a cross-sectional view of section AA in Figure 1 provided in an embodiment of this disclosure;

[0029] Figure 3 is another cross-sectional view of point AA in Figure 1 provided in an embodiment of this disclosure;

[0030] Figure 4 is a schematic diagram of the battery cell top cover from a second perspective provided in an embodiment of this disclosure;

[0031] Figure 5 is a schematic diagram of the top cover of the battery cell provided in an embodiment of this disclosure from a third-view perspective.

[0032] Icons: 10-Cell top cover; 100-Cover plate; 110-Terminal hole; 130-Pressure relief hole; 150-Injection hole; 200-Terminal; 300-Upper terminal; 310-First groove; 500-Lower terminal; 510-Second groove; 710-Upper insulation component; 730-Lower insulation component; 750-Sealing component; 810-Explosion-proof valve; 830-Protective patch. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely to illustrate selected embodiments of the disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this disclosure and simplifying the description, 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, and therefore should not be construed as a limitation of this disclosure. In addition, the terms "first," "second," and "third," etc., are only configured to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0039] Figure 1 is a first-view schematic diagram of the battery cell top cover 10 provided in an embodiment of the present disclosure, Figure 2 is a cross-sectional schematic diagram of section AA in Figure 1 provided in an embodiment of the present disclosure, and Figure 3 is another cross-sectional schematic diagram of section AA in Figure 1 provided in an embodiment of the present disclosure. Referring to Figures 1 to 3, the present disclosure provides a battery cell top cover 10, which includes a cover plate 100, an upper electrode post 300, and a lower electrode post 500.

[0040] The cover plate 100 has an electrode hole 110 for accommodating the upper electrode 300 and the lower electrode 500; the upper electrode 300 partially protrudes downward to form a first groove 310, and the lower electrode 500 partially protrudes upward to form a second groove 510, and the bottom wall of the first groove 310 is connected to the bottom wall of the second groove 510.

[0041] Based on the above-mentioned first groove 310 and second groove 510, the weight of the upper electrode post 300 and the lower electrode post 500 is reduced respectively, saving a certain amount of material for the upper electrode post 300 and the lower electrode post 500, thereby realizing the lightweight design of the cell top cover 10 and reducing the manufacturing cost of the cell top cover 10 at the same time.

[0042] Considering the production efficiency and product quality of the top cover 10 of the battery cell, both the upper electrode post 300 and the lower electrode post 500 can be formed by integral stamping. Furthermore, the first groove 310 and the second groove 510 can be welded or bonded together by the bottom wall of the first groove 310 and the bottom wall of the second groove 510.

[0043] In detail, when the welding process is used, the laser penetrates from the bottom wall of the first groove 310 to the bottom wall of the second groove 510 to solidify the weld; when the adhesive process is used, styrene-butadiene rubber or polyurethane can be selected as the adhesive material for bonding.

[0044] Referring to Figure 1, in this embodiment, the cover plate 100 can be provided with two electrode post holes 110, which serve as the positive electrode post hole 110 and the negative electrode post hole 110, respectively. Based on this, the electrode post 200 formed by the upper electrode post 300 and the lower electrode post 500 has different application scenarios. Therefore, both the upper electrode post 300 and the lower electrode post 500 are made of aluminum, or the upper electrode post 300 is made of aluminum and the lower electrode post 500 is made of copper-aluminum composite material.

[0045] In detail, when both the upper electrode 300 and the lower electrode 500 are used as positive electrodes, they are made of aluminum because a dense oxide film can form on the surface of aluminum, making it less susceptible to corrosion at high potentials. When both the upper electrode 300 and the lower electrode 500 are used as negative electrodes, the upper electrode 300 is made of aluminum, which has good weldability and is easier to weld with other components. The lower electrode 500 is made of copper-aluminum composite material, which has good electrical properties and does not undergo electrochemical corrosion, making it easier to conduct electricity in contact with the electrolyte.

[0046] Please refer to Figures 1 and 4. The top cover 10 of the battery cell also includes an upper insulating member 710 and a lower insulating member 730 connected to the two sides opposite to the cover plate 100, respectively. The upper insulating member 710 is configured to insulate the upper pole post 300 from the cover plate 100 and to insulate the upper pole post 300 from the external metal. The lower insulating member 730 is configured to insulate the lower pole post 500 from the cover plate 100 and to insulate the lower pole post 500 from the core.

[0047] Based on the above configuration, it is explained that the pole post 200 formed by the interconnected upper pole post 300 and lower pole post 500 passes through the pole post hole 110 from top to bottom, and then passes through the upper insulating member 710 and the lower insulating member 730 in sequence. This ensures that the pole post 200 is insulated from the external metal, the cover plate 100 and the core, thereby preventing the battery from short-circuiting or corroding when the cell top cover 10 is configured into a battery, thus improving the safety of the battery and extending its service life.

[0048] Specifically, as shown in Figure 1, the upper insulating member 710 has a "U"-shaped structure design and is configured to wrap around the upper part of the pole post 200, so as to insulate it from the cover plate 100 or prevent it from being short-circuited to external metal. As shown in Figure 4, the lower insulating member 730 has an integrated or separate structure design and is configured to insulate the pole post 200 or the internal connectors and core of the cell from the cover plate 100.

[0049] Furthermore, referring to Figures 2 and 3, to ensure the sealing of the inner and outer sides of the cover plate 100 and the airtightness of the battery, the cell top cover 10 also includes a sealing element 750. This sealing element 750 is disposed between the upper insulating element 710 and the lower insulating element 730, and is used for the insertion of the terminal post 200. It should also be noted that the upper insulating element 710, the sealing element 750, and the lower insulating element 730 are all welded and fixed to the wall of the terminal post hole 110.

[0050] To prevent the battery from expanding or exploding when using the cell top cover 10 provided in this application, the cover plate 100 is provided with a pressure relief hole 130. The cell top cover 10 also includes an explosion-proof valve 810 welded to the hole wall of the pressure relief hole 130, and a protective patch 830 that cooperates with the explosion-proof valve 810.

[0051] Understandably, when the internal pressure of the battery exceeds the set safety threshold, the explosion-proof valve 810 allows gas to be released into the external environment through the pressure relief port 130, effectively reducing the internal pressure of the battery and minimizing the risk of explosion. Additionally, the protective patch 830 is designed as a flat plate to prevent electrolyte corrosion and the influence of the external environment.

[0052] Please refer to Figure 5. In addition to the pressure relief hole 130 and the terminal hole 110, the cover plate 100 also has a liquid injection hole 150 to facilitate battery maintenance and management by the user. Specifically, the user can inject electrolyte or other liquids through the liquid injection hole 150 to replenish the chemical substances in the battery, thereby extending battery life or improving battery performance.

[0053] Referring again to Figure 2, in some embodiments, the opening end of the first groove 310 and the opening end of the second groove 510 face opposite directions, and the outer side of the bottom wall of the first groove 310 is connected to the outer side of the bottom wall of the second groove 510. Based on the above configuration, the basic height requirement of the formed pole post 200 is ensured while saving materials, facilitating subsequent installation. Considering that an increased connection area can easily increase the stability of the connection between the upper pole post 300 and the lower pole post 500, the bottom wall dimensions of the first groove 310 and the second groove 510 are the same.

[0054] Referring again to Figure 3, in some embodiments, the opening end of the first groove 310 and the opening end of the second groove 510 face the same direction, and the outer side of the bottom wall of the first groove 310 is connected to the inner side of the bottom wall of the second groove 510. Based on this arrangement, it facilitates the positioning of the upper electrode post 300 and the lower electrode post 500, avoiding misalignment during connection. To further improve positioning accuracy, the bottom wall dimension of the first groove 310 is smaller than that of the second groove 510, and the sidewall of the first groove 310 is connected to the sidewall of the second groove 510.

[0055] It is understood that in the embodiment shown in Figure 3, since the upper electrode post 300 is embedded in the lower electrode post 500, the sidewall of the first groove 310 can be provided with threads that match the sidewall of the second groove 510, and the two are connected by threads. That is, the sidewall of the first groove 310 is provided with a first threaded portion, and the sidewall of the second groove 510 is provided with a second threaded portion that mates with the first threaded portion. Similarly, the lower electrode post 500 can also be embedded in the upper electrode post 300 and fixed by a threaded connection, which will not be described in detail here.

[0056] Furthermore, it should be noted that in the embodiment shown in Figure 2, the accuracy of positioning can be improved by adding a positioning part, such as by providing a snap-fit ​​structure on the bottom wall of the first groove 310 and the bottom wall of the second groove 510, or by providing a limiting structure circumferentially on the side wall of the first groove 310 or the second groove 510. In the embodiment shown in Figure 3, the basic height of the pole post 200 can be ensured by extending the protrusion height of the upper pole post 300 or the lower pole post 500.

[0057] In summary, this application provides a battery cell top cover 10, which includes a cover plate 100, an upper electrode post 300, and a lower electrode post 500. The cover plate 100 has electrode post holes 110 for accommodating the upper electrode post 300 and the lower electrode post 500. The upper electrode post 300 partially protrudes downward to form a first groove 310, and the lower electrode post 500 partially protrudes upward to form a second groove 510, with the bottom wall of the first groove 310 connected to the bottom wall of the second groove 510. Based on the aforementioned arrangement of the first groove 310 and the second groove 510, the weight of the upper electrode post 300 and the lower electrode post 500 is reduced, saving material for the upper electrode post 300 and the lower electrode post 500, thereby achieving a lightweight design for the battery cell top cover 10 and simultaneously reducing the manufacturing cost of the battery cell top cover 10.

[0058] In addition, this application also provides a battery that includes the cell top cover 10 in the above embodiments. Therefore, it also reduces the weight of the upper electrode post 300 and the lower electrode post 500, saves a certain amount of material of the upper electrode post 300 and the lower electrode post 500, thereby achieving a lightweight design and reducing manufacturing costs at the same time.

[0059] The above are merely preferred embodiments of this disclosure and are not intended to limit the scope of this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure. Industrial applicability

[0060] In summary, this disclosure provides a cell top cover and a battery that can reduce the weight of the upper and lower terminals and save on the materials used for the upper and lower terminals.

Claims

1. A battery cell top cover, characterized in that, It includes a cover plate (100), an upper electrode post (300), and a lower electrode post (500); the cover plate (100) has an electrode post hole (110) for accommodating the upper electrode post (300) and the lower electrode post (500); the upper electrode post (300) partially protrudes downward to form a first groove (310), and the lower electrode post (500) partially protrudes upward to form a second groove (510), and the bottom wall of the first groove (310) is connected to the bottom wall of the second groove (510).

2. The cell top cover according to claim 1, characterized in that, The opening end of the first groove (310) faces opposite directions to the opening end of the second groove (510), and the outer side of the bottom wall of the first groove (310) is connected to the outer side of the bottom wall of the second groove (510).

3. The cell top cover according to claim 2, characterized in that, The bottom wall of the first groove (310) has the same dimensions as the bottom wall of the second groove (510).

4. The cell top cover according to claim 1, characterized in that, The opening end of the first groove (310) and the opening end of the second groove (510) face the same direction, and the outer side of the bottom wall of the first groove (310) is connected to the inner side of the bottom wall of the second groove (510).

5. The cell top cover according to claim 4, characterized in that, The bottom wall dimension of the first groove (310) is smaller than the bottom wall dimension of the second groove (510), and the side wall of the first groove (310) is connected to the side wall of the second groove (510).

6. The cell top cover according to claim 5, characterized in that, The sidewall of the first groove (310) is provided with a first threaded portion, and the sidewall of the second groove (510) is provided with a second threaded portion that mates with the first threaded portion.

7. The cell top cover according to any one of claims 1-6, characterized in that, The bottom wall of the first groove (310) is welded or bonded to the bottom wall of the second groove (510).

8. The cell top cover according to any one of claims 1-7, characterized in that, Both the upper electrode post (300) and the lower electrode post (500) are made of aluminum.

9. The cell top cover according to any one of claims 1-7, characterized in that, The upper electrode post (300) is made of aluminum, and the lower electrode post (500) is made of copper-aluminum composite material.

10. The cell top cover according to any one of claims 1-9, characterized in that, The cell top cover (10) further includes an upper insulating member (710) and a lower insulating member (730) connected to the two sides opposite to the cover plate (100), respectively; the upper insulating member (710) is configured to insulate the upper pole (300) from the cover plate (100) and to insulate the upper pole (300) from external metal; the lower insulating member (730) is configured to insulate the lower pole (500) from the cover plate (100) and to insulate the lower pole (500) from the core.

11. The cell top cover according to claim 10, characterized in that, The lower insulating component (730) is designed as an integral or separate structure.

12. The cell top cover according to claim 10 or 11, characterized in that, The cell top cover (10) also includes a sealing element (750), which is disposed between the upper insulating element (710) and the lower insulating element (730).

13. The cell top cover according to any one of claims 1-12, characterized in that, The cover plate (100) has a pressure relief hole (130), and the top cover (10) of the battery cell also includes an explosion-proof valve (810) welded to the wall of the pressure relief hole (130), and a protective patch (830) that cooperates with the explosion-proof valve (810).

14. The cell top cover according to claim 13, characterized in that, The protective patch (830) has a flat structure.

15. A battery, characterized in that, Includes the cell top cover (10) as described in any one of claims 1-14.

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