Battery cover plate and battery

Abstract

The application provides a battery cover plate, which comprises a pole, a cover plate body, a connecting piece and a patch. The pole comprises four stepped portions, the second and third stepped portions pass through a through hole of the cover plate body and are welded with the connecting piece to form an integral body, the connecting piece is provided with a sunken groove, and the patch is provided with an interference fit on the outer periphery of the fourth stepped portion and covers the sunken groove to prevent welding slag. The axial centers of the stepped portions are collinear, and the conductivity efficiency is improved. The thickness of the patch and the diameter of the fourth stepped portion have a specific range, and the strength, protection, welding and connecting effects are considered. The battery cover plate is also provided with a sealing piece and first and second insulating pieces to improve the sealing performance and realize electrical insulation. Meanwhile, the application also provides a battery comprising the battery cover plate. Through the synergistic effect of the components, the battery cover plate can realize efficient current transmission, stable structure connection, reliable electrical insulation and good welding slag protection, improve the overall performance, safety and reliability of the battery, and meet the demand of high-power batteries.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery covers and batteries. Background Technology

[0002] In the field of battery technology, the battery cover, as a key component of a battery, undertakes multiple functions, including current transmission, encapsulating the internal structure of the battery, and realizing electrical connections. However, existing battery covers still face many technical challenges in design and practical application.

[0003] In terms of current transfer efficiency, traditional battery covers have unreasonable structural design, resulting in complex current transfer paths, increased resistance, and severe current loss, which cannot meet the high-efficiency current transfer requirements of high-power batteries.

[0004] In the manufacturing process of battery cover plates, the issue of weld slag protection also urgently needs to be addressed. If weld slag falls onto the surface of critical components, it will not only affect the connection effect but may also cause safety hazards such as short circuits. Therefore, how to design a battery cover plate with efficient current transmission capability, stable structural connection, reliable electrical insulation performance, and good weld slag protection effect has become a technical problem that urgently needs to be solved in the current battery technology field. Utility Model Content

[0005] Therefore, it is necessary to address the technical problems existing in current transmission efficiency, structural stability, electrical insulation performance, and slag protection during manufacturing of current battery covers by providing a battery cover and battery that can provide the battery cover with high current transmission capacity, stable structural connection, reliable electrical insulation performance, and good slag protection effect, thereby improving the overall performance, safety, and reliability of the battery containing the battery cover.

[0006] The first aspect of this utility model provides a battery cover plate, including a terminal post, a cover plate body, and a connector. The terminal post includes a first step, a second step, a third step, and a fourth step connected sequentially along the axial direction, with their cross-sectional areas decreasing sequentially. The cover plate body has a first through hole through which the second and third step portions pass. The second and third step portions pass through the first through hole, and the third step portion is inserted into a welding hole on the connector, forming an integral structure with the connector by welding. The end face of the connector away from the cover plate body has a recessed groove that expands outward from the welding hole, and the fourth step portion extends into the recessed groove. The design also includes a patch, which is interference-fitted onto the outer periphery of the fourth step portion and covers the recessed groove. This design, through the multi-step terminal post structure, achieves reasonable distribution and efficient transmission of current in different parts. The different diameters of the step portions meet the connection requirements with different components, improving the flexibility and stability of the connection. The design of the sink prevents welding protrusions from affecting the connection between the connector and the tab. The patch further optimizes the connection structure, achieving a tight connection with the fourth step while blocking the welding slag in the sink, preventing the welding slag from falling onto the surface of the connector and the tab and affecting the connection effect, thus improving the safety and reliability of the battery cover.

[0007] In other embodiments, the first, second, third, and fourth steps are all cylindrical, and their axes are collinear. This design significantly improves conductivity because the current travels more directly and smoothly through the collinear cylindrical structure, reducing current loss during transmission. The current transmitted through the tab can be rapidly transferred via the fourth step, third step, second step, and first step. Furthermore, due to the collinearity, the current transmission is more uniform, avoiding problems such as localized overheating caused by uneven current distribution, thus extending the lifespan of the battery cover. This uniform current transmission characteristic is crucial for the stable operation of the battery, effectively reducing safety hazards caused by current concentration and improving battery safety and reliability.

[0008] In other embodiments, the thickness D of the patch satisfies: 0.2mm ≤ D ≤ 0.8mm. If the value is too small, the patch strength is low, and it may deform or be damaged during use due to external pressure, vibration, or other factors, thus affecting its connection with the fourth step and its protective effect against welding slag in the sink. If the value is too large, although the patch strength can be guaranteed, the patch thickness is too large when welding the tab to the base plate (which requires welding through the patch), making it difficult to weld through. This results in low welding strength between the tab and the base plate, and assembly is also more difficult. Insufficient welding strength may lead to an unstable connection between the tab and the base plate, which can easily cause problems such as poor contact and open circuits during battery use, affecting the normal operation of the battery. Therefore, this thickness range achieves a balance between ensuring patch strength, protective effect, and welding assembly effect.

[0009] In other embodiments, the patch, the fourth step, and the connector are all located on the same plane at their ends furthest from the cover plate body. That is, when the connector is fully soldered to the tab, the patch is circumferentially fitted onto the fourth step, allowing the fourth step to directly contact the tab, reducing internal resistance and improving current transmission efficiency. Because all three are on the same plane, current transmission does not require additional steps or protrusions, reducing obstacles in the current path and thus lowering internal resistance. Simultaneously, the connector also improves current transmission efficiency, and since the patch is made of conductive material, it can also transmit current, significantly improving overall current transmission efficiency. This multi-path current transmission method gives the battery cover plate higher performance in current transmission, meeting the requirements of high-power batteries.

[0010] In other embodiments, the patch is made of a conductive material, including either aluminum or copper. The choice of patch material is related to the positive and negative electrodes of the battery. On the positive electrode side, the tab is generally made of aluminum foil, with aluminum being the preferred material. Similarly, copper is preferred for the negative electrode. This is because aluminum and copper have good conductivity, which meets the requirements for current transmission, and they match the material of the tab, facilitating a stable electrical connection. Furthermore, the patch can also be made of other metals with good conductivity to meet the needs of different battery designs.

[0011] In other embodiments, the diameter L of the fourth step portion satisfies: 2mm ≤ L ≤ 10mm. Considering both the contact area between the fourth step portion and the tab, the connection effect between the fourth step portion and the patch also needs to be considered. A sufficiently large diameter of the fourth step portion results in a sufficiently large contact area with the tab, improving current transmission efficiency. This is because a larger contact area means less resistance during current transmission, allowing for smoother flow and thus improved efficiency. However, an excessively large diameter can affect the patch connection, as the patch needs to be interference-fitted onto the outer circumference of the fourth step portion; an excessively large diameter may lead to difficulties in patch installation or a loose connection. Conversely, a diameter that is too small, while facilitating patch connection, results in an insufficient contact area with the tab, affecting current transmission efficiency. Therefore, this diameter range strikes a balance between contact area and connection effect.

[0012] In other embodiments, a positioning groove is provided in the middle of the side of the first stepped portion away from the second stepped portion. The positioning groove serves a positioning function, facilitating subsequent assembly. During the manufacturing process of the battery cover, multiple components need to be assembled. The positioning groove can serve as a positioning reference, ensuring that the terminal post is accurately positioned on the cover body, thereby improving assembly efficiency and assembly quality.

[0013] In other embodiments, a sealing element is also included, which is press-fitted into the first through hole and sleeved on the outer periphery of the second stepped portion. The sealing element is also made of insulating material, which improves the overall sealing performance, prevents electrolyte leakage from inside the battery, and avoids corrosion and damage to the external environment and other components caused by the electrolyte. Furthermore, the sealing element, together with the first and second insulating elements, achieves isolation and insulation between the cover plate body and the terminal post, preventing electrical faults such as short circuits inside the battery and ensuring safe battery operation.

[0014] In other embodiments, a first insulating member and a second insulating member are also included. The first insulating member includes a side wall and a bottom wall, and a first stepped portion is disposed within an installation space enclosed by the side wall and the bottom wall. The bottom wall has a third through hole through which the second stepped portion passes. The second insulating member is disposed between the cover plate body and the connector, and has a fourth through hole through which the second stepped portion passes. The first insulating member effectively prevents electrical short circuits between the terminal and the cover plate body, ensuring the electrical safety of the battery. Simultaneously, the first stepped portion also has a stepped groove corresponding to the side wall of the first insulating member in its circumferential direction, increasing the connection stability between the terminal and the first insulating member and preventing the terminal from shaking or displacing during use. The second insulating member separates the terminal, connector, and cover plate body, further enhancing the electrical insulation performance of the battery cover and preventing electrical short circuits between different components. At the same time, the second insulating member also provides a certain buffering and protective function, reducing damage to the internal structure of the battery cover caused by vibration, impact, and other factors.

[0015] The second aspect of this utility model provides a battery including the aforementioned battery cover. Through the synergistic action of components such as the terminals, cover body, sealing element, first insulating element, and second insulating element, not only is the battery's sealing performance improved, but electrical insulation is also achieved, ensuring the battery's safe operation. Furthermore, the patch design in the battery cover effectively prevents welding slag from falling onto the connectors and electrode surfaces, ensuring connection effectiveness and improving the reliability of the battery's electrical connection. Simultaneously, the patch can also participate in current transmission, further improving the battery's current delivery efficiency. This multifunctional structural design makes the battery cover play a crucial role in the battery, contributing to the overall performance improvement of the battery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the battery cover plate in Embodiment 1 of this application.

[0017] Figure 2 This is a structural schematic diagram of the battery cover plate in Embodiment 1 of this application from another perspective.

[0018] Figure 3 This is a top view of the battery cover in Embodiment 1 of this application.

[0019] Figure 4 for Figure 3 A sectional view along line A.

[0020] Figure 5 for Figure 4 A magnified view of part B in the middle.

[0021] Figure 6 A schematic diagram of the structure of the electrode post and patch in Embodiment 1 of this application.

[0022] Figure label:

[0023] 100, pole post; 200, first insulating component; 300, cover plate body; 400, connector; 500, patch; 600, sealing component; 700, second insulating component;

[0024] 101. Positioning groove; 102. Step groove; 110. First step section; 120. Second step section; 130. Third step section; 140. Fourth step section;

[0025] 201. Side wall; 202. Bottom wall;

[0026] 301, First through hole;

[0027] 401. Welding hole; 402. Countersink;

[0028] 501, Second through hole. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] Example 1

[0036] This embodiment discloses a battery cover, which, as an important component of the battery, undertakes multiple functions such as current transmission, encapsulating the internal structure of the battery, and realizing electrical connections. The specific structure of the battery cover and its beneficial effects will be described in detail below.

[0037] A battery cover mainly comprises three parts: a terminal post 100, a cover body 300, and a connector 400. The connector 400, as a conductor structure, plays a crucial role in tightly connecting with the tabs to achieve efficient current transfer. The cover body 300 serves as the battery casing, encapsulating the internal structure of the battery and protecting internal components, preventing electrolyte leakage, and maintaining the overall structural stability of the battery. The terminal post 100 is connected to the tabs via the connector 400, and extends beyond the cover body 300 to conduct the current from inside the battery to the external circuit, enabling the battery to supply power. This structural design allows the battery cover to fully perform its functions of current transfer and encapsulation protection within the battery, improving the overall performance and reliability of the battery.

[0038] The terminal post 100 further includes a first step portion 110, a second step portion 120, a third step portion 130, and a fourth step portion 140 connected sequentially along the axial direction with progressively decreasing cross-sectional areas. This multi-step design has many advantages. On the one hand, the progressively decreasing cross-sectional area of ​​each step portion helps to achieve reasonable distribution and efficient transmission of current in different parts. On the other hand, step portions of different diameters can meet the connection requirements with different components, improving the flexibility and stability of the connection. Larger step portions can provide better mechanical support, while smaller step portions facilitate precise connection with other small components, thereby optimizing the structure and performance of the entire battery cover.

[0039] In this embodiment, the first step portion 110, the second step portion 120, the third step portion 130, and the fourth step portion 140 are all cylindrical, and their axes are collinear. This design significantly improves conductivity because the current travels more directly and smoothly through the collinear cylindrical structure, reducing current loss during transmission. The current transmitted through the tab can be rapidly transmitted via the fourth step portion 140-the third step portion 130-the second step portion 120-the first step portion 110, and due to the collinearity of the axes, the current transmission is more uniform, avoiding problems such as localized overheating caused by uneven current distribution, extending the service life of the battery cover. This uniform current transmission characteristic is crucial for the stable operation of the battery, effectively reducing safety hazards caused by current concentration, and improving the safety and reliability of the battery.

[0040] In another embodiment, the steps can also be staggered to match the tab mounting positions. This design demonstrates the flexibility of the battery cover structure, as the tab mounting positions may vary depending on factors such as battery model and design requirements. By staggering the steps, different tab mounting positions can be better accommodated, ensuring a stable and reliable connection between the terminal post 100 and the tab, thereby meeting diverse battery design needs.

[0041] The cover plate body 300 is provided with a first through hole 301 for the second step portion 120 and the third step portion 130 to pass through. After the second step portion 120 and the third step portion 130 pass through the first through hole 301, the third step portion 130 is inserted into the welding hole 401 opened on the connector 400, and forms an integral structure with the connector 400 by welding. This connection method realizes the rapid docking of the terminal post 100 and the connector 400, and the connector 400 is simultaneously connected to the second step portion 120 and the third step portion 130, which greatly improves the connection effect. The welded integral structure has the advantages of high connection strength and good stability, which can effectively prevent the terminal post 100 and the connector 400 from loosening or separating due to vibration, impact and other factors during battery use, ensuring the electrical connection reliability of the battery cover plate. This connection method is crucial for the long-term stable operation of the battery, reduces battery failures caused by connection problems, and improves the overall quality and reliability of the battery.

[0042] A recessed groove 402, extending outward from the welding hole 401, is provided on the end face of the connector 400 away from the cover plate body 300. Therefore, any protrusion formed in the welding area is also located within the recessed groove 402, rather than protruding directly to the lower end face of the connector 400. This design prevents the welding protrusion from affecting the connection between the connector 400 and the electrode. If the welding protrusion protruded to the lower end face of the connector 400, it might cause unevenness in the contact surface between the connector 400 and the electrode, increasing contact resistance and thus affecting current transmission efficiency. Simultaneously, the fourth step portion 140 extends into the recessed groove, further optimizing the connection structure, making the welding process more convenient, and ensuring good contact between the welded connector 400 and the electrode, thus improving the stability and efficiency of current transmission.

[0043] like Figure 2 , Figures 4-6 As shown, it also includes a patch 500, which is interference-fitted onto the outer periphery of the fourth step portion 140 and covers the groove. The interference fit between the patch 500 and the fourth step portion 140 achieves a tight connection. Simultaneously, other positions of the patch 500 also cover the groove, preventing welding slag from falling onto the surfaces of the connector 400 and the electrode tab, thus affecting the connection. If welding slag falls onto the surfaces of the connector 400 and the electrode tab, it may increase the contact resistance between them, or even cause a short circuit and other safety hazards. The patch 500 effectively solves this problem, improving the safety and reliability of the battery cover. The design of the patch 500 not only serves a connecting and protective function but also facilitates the manufacturing and use of the battery cover, reducing production defects and maintenance costs caused by welding slag issues.

[0044] like Figure 4and Figure 5 As shown, in this embodiment, the ends of the patch 500, the fourth step portion 140, and the connector 400 furthest from the cover plate body 300 are on the same plane. That is, when the connector 400 is fully soldered to the tab, the patch 500 is fitted around the fourth step portion 140, allowing the fourth step portion 140 to directly contact the tab, reducing internal resistance and improving current transmission efficiency. Because the three are on the same plane, current transmission does not require additional steps or protrusions, reducing obstacles in the current path and thus lowering internal resistance. Simultaneously, the connector 400 also improves transmission efficiency, and since the patch 500 is made of conductive material, current can also be transmitted through the patch 500, significantly improving overall current transmission efficiency. This multi-path current transmission method gives the battery cover plate higher performance in current transmission, meeting the needs of high-power batteries.

[0045] like Figure 5 As shown, in this embodiment, the thickness D of the patch 500 satisfies: 0.2mm ≤ D ≤ 0.8mm. If the value is too small, the patch 500 has low strength and may deform or be damaged during use due to external pressure, vibration, or other factors, thus affecting its connection with the fourth step 140 and its protective effect against welding slag in the settling tank. If the value is too large, although it ensures the strength of the patch 500, the thickness of the patch 500 is too large, making it difficult to weld through when welding the tab to the base plate of the terminal post 100 (which requires welding through the patch 500). This results in low welding strength between the tab and the base plate and makes assembly more difficult. Insufficient welding strength may lead to a weak connection between the tab and the terminal post 100, easily causing problems such as poor contact and open circuits during battery use, affecting the normal operation of the battery.

[0046] In this embodiment, patch 500 is made of a conductive material, including either aluminum or copper. The choice of material for patch 500 is related to the positive and negative electrodes of the battery. On the positive electrode side, the tab is generally made of aluminum foil, with aluminum being the preferred material. Similarly, copper is the preferred material for the negative electrode. This is because aluminum and copper have good conductivity, which can meet the requirements of current transmission, and they match the material of the tab, which is beneficial for achieving a stable electrical connection. In addition, patch 500 can also be made of other metal materials with good conductivity to meet the needs of different battery designs.

[0047] like Figure 5As shown, in this embodiment, the diameter L of the fourth step portion 140 satisfies: 2mm ≤ L ≤ 10mm. Considering the contact area between the fourth step portion 140 and the tab, the connection effect between the fourth step portion 140 and the patch 500 also needs to be considered. A sufficiently large diameter of the fourth step portion 140 results in a sufficiently large contact area with the tab, improving current transmission efficiency. This is because a larger contact area means less resistance during current transmission, allowing for smoother flow and thus improved current transmission efficiency. However, an excessively large diameter can affect the connection of the patch 500, as the patch 500 needs to be interference-fitted onto the outer circumference of the fourth step portion 140. An excessively large diameter may lead to difficulties in installing the patch 500 or a loose connection. Conversely, if the diameter of the fourth step portion 140 is too small, while facilitating the connection of the patch 500, the contact area with the tab will be too small, affecting current transmission efficiency.

[0048] like Figure 6 As shown, in this embodiment, the patch 500 is provided with a second through hole 501 that mates with the fourth step portion 140. The diameter of the second through hole 501 on the patch 500 is smaller than the diameter of the fourth step portion 140, mainly considering the stability and strength of the interference fit. The interference fit allows the patch 500 to be tightly fitted onto the fourth step portion 140, preventing the patch 500 from loosening or falling off during use, and ensuring the structural stability and electrical connection reliability of the battery cover.

[0049] like Figure 4 As shown, in this embodiment, a positioning groove 101 is provided in the middle of the side of the first step portion 110 away from the second step portion 120. The positioning groove 101 serves a positioning function, facilitating subsequent assembly. During the manufacturing process of the battery cover, multiple components need to be assembled. The positioning groove 101 can serve as a positioning reference to ensure that the terminal post 100 is accurately installed on the cover body 300, thereby improving assembly efficiency and assembly quality.

[0050] like Figure 4 As shown, this embodiment also includes a sealing element 600, which is press-fitted into the first through hole 301 and sleeved on the outer periphery of the second step portion 120. The sealing element 600 is also made of insulating material, which improves the overall sealing performance, prevents electrolyte leakage inside the battery, and avoids corrosion and damage to the external environment and other components caused by the electrolyte. On the other hand, the sealing element 600, together with the first insulating element 200 and the second insulating element 700, achieves isolation and insulation between the cover plate body 300 and the terminal post 100, preventing electrical faults such as short circuits inside the battery and ensuring the safe operation of the battery.

[0051] like Figure 4As shown, this embodiment also includes a first insulating member 200 and a second insulating member 700. The first insulating member 200 includes a side wall 201 and a bottom wall 202, and a first stepped portion 110 is disposed within the installation space enclosed by the side wall 201 and the bottom wall 202. The bottom wall 202 is provided with a third through hole for the second stepped portion 120 to pass through. Furthermore, the first stepped portion 110 is also provided with a stepped groove 102 in the circumferential direction corresponding to the side wall 201 of the first insulating member 200, which separates the terminal post 100 from the cover plate body 300. The provision of the first insulating member 200 effectively prevents electrical short circuits between the terminal post 100 and the cover plate body 300, ensuring the electrical safety of the battery. At the same time, the design of the stepped groove 102 increases the connection stability between the terminal post 100 and the first insulating member 200, preventing the terminal post 100 from shaking or shifting during use.

[0052] like Figure 4 As shown, the second insulating member 700 is disposed between the cover plate body 300 and the connector 400, and the second insulating member 700 is provided with a fourth through hole for the second step portion 120 to pass through. The second insulating member 700 separates the terminal post 100, the connector 400 and the cover plate body 300, further enhancing the electrical insulation performance of the battery cover and preventing electrical short circuits between different components. At the same time, the second insulating member 700 also plays a certain role in buffering and protection, reducing damage to the internal structure of the battery cover caused by vibration, impact and other factors.

[0053] Example 2

[0054] This embodiment discloses a battery that includes the battery cover plate described in detail in Embodiment 1 above. Because the battery cover plate possesses the numerous advantages and characteristics mentioned above, the battery including this cover plate exhibits excellent performance, safety, and reliability.

[0055] The battery employs the aforementioned battery cover, enabling it to achieve high efficiency and stability in current transmission. Through the coordinated action of components such as the terminal post 100, cover body 300, sealing element 600, first insulating element 200, and second insulating element 700, not only is the battery's sealing performance improved, but electrical insulation is also achieved, ensuring safe operation. Furthermore, the design of the patch 500 in the battery cover effectively prevents welding slag from falling onto the connector 400 and the electrode surface, ensuring a good connection and improving the reliability of the battery's electrical connection. Simultaneously, the patch 500 can also participate in current transmission, further enhancing the battery's current delivery efficiency. This multifunctional structural design makes the battery cover play a crucial role in the battery, contributing to the overall performance improvement of the battery.

[0056] In summary, batteries incorporating the aforementioned battery cover exhibit significant advantages in performance, safety, and reliability, meeting the demands of various application scenarios and possessing broad market application prospects. The design and manufacturing process of this battery cover fully considers the various characteristics and usage requirements of the battery. Through rational structural design and material selection, optimizations have been achieved in current transmission, encapsulation protection, and electrical insulation, providing strong support for the high-performance operation of the battery.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cover plate, characterized by, Includes pole, cover plate body and connectors; The pole post includes a first step portion, a second step portion, a third step portion, and a fourth step portion that are connected sequentially along the axial direction and whose cross-sectional areas decrease sequentially. The cover plate body is provided with a first through hole for the second step and the third step to pass through. The second step and the third step pass through the first through hole, and the third step is inserted into the welding hole opened on the connector and forms an integral structure with the connector by welding. The connector has a groove on its end face away from the cover plate body that expands outward for the welding hole, and the fourth step extends into the groove. It also includes a patch, which is interference-fitted onto the outer periphery of the fourth step and covers the sink.

2. The battery cover plate of claim 1, wherein, The first, second, third, and fourth steps are all cylindrical, and their axes are collinear.

3. A battery cover according to any one of claims 1-2, characterized in that, The thickness D of the patch satisfies: 0.2mm≤D≤0.8mm.

4. A battery cover according to claim 3, characterized in that, The patch, the fourth step, and the connector are all located on the same plane at the ends away from the cover plate body.

5. A battery cover according to claim 4, characterized in that, The patch is made of a conductive material, including either aluminum or copper.

6. A battery cover according to any one of claims 4-5, characterized in that, The diameter L of the fourth step portion satisfies: 2mm≤L≤10mm. The patch is provided with a second through hole that mates with the fourth step portion, and the diameter of the second through hole on the patch is smaller than the diameter of the fourth step portion.

7. A battery cover plate according to claim 6, wherein A positioning groove is provided in the middle of the side of the first step that is away from the second step.

8. A battery cover according to claim 6, characterized in that, It also includes a sealing element, which is press-fitted into the first through hole and sleeved on the outer periphery of the second step portion.

9. The battery cover plate of claim 8, wherein, It also includes a first insulating component and a second insulating component; The first insulating member includes a side wall and a bottom wall, the first stepped portion is disposed within the installation space enclosed by the side wall and the bottom wall, and the bottom wall is provided with a third through hole for the second stepped portion to pass through; The second insulating member is disposed between the cover plate body and the connector, and the second insulating member is provided with a fourth through hole for the second stepped portion to pass through.

10. A battery, characterized by It includes a battery cover as described in any one of claims 1-9.

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