Cover assembly and battery containing it
The cover assembly with a heat dissipation material at the connection point between electrode and conductive members in batteries addresses temperature rise, weight, and cost issues, enhancing safety and reliability by increasing contact area and improving heat dissipation.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- ENVISION DYNAMICS TECH (JIANGSU) CO LTD
- Filing Date
- 2023-12-07
- Publication Date
- 2026-07-24
AI Technical Summary
Existing battery designs face challenges in managing temperature rise, weight, and cost due to the use of thick poles for electrical connections, which compromise safety and reliability.
A cover assembly comprising an electrode lead member, external conductive member, and heat dissipation material, where the heat dissipation material is installed at the connection point between the two, increasing contact area and preventing excessive temperature rise while reducing weight and cost.
The proposed structure effectively controls temperature rise, saves material, reduces weight, and ensures reliability by using a heat dissipation material to increase contact area and improve heat dissipation, while also addressing welding challenges between different metal materials.
Smart Images
Figure 2026524851000001_ABST
Abstract
Description
Technical Field
[0004] , , , , , ,
[0001] The present disclosure relates to the field of batteries, and particularly to a cover assembly and a battery including the same.
Background Art
[0002] Currently, in a rectangular battery, an electrode member usually installed on a cover body and a pole are electrically connected via a connecting member. A tab is installed on the electrode member. The connecting member includes a pole connection region and a tab connection region. The tab connection region and the tab are electrically connected, and the whole after assembly is electrically connected to the pole through the pole connection region, completing the extraction and assembly of the electrode. In the prior art, a method without using a connecting member for the pole is adopted. By forming a bottom plate on the bottom surface of the pole, the pole extends out and is electrically connected to a cover plate through hole on the cover body and an external conductive member. The bottom plate is located on the side close to the electrode member of the cover body, and an insulating member is provided between the bottom plate and the cover body. The bottom plate and the tab drawn out on the electrode member are electrically connected.
[0003] In order to ensure the current passing area of the cell and control the temperature rise, the industry adopts a solid pole, and ensures that the dimensions of the pole are sufficiently large and have a certain thickness. However, this will greatly increase the weight and cost of the pole. On this basis, in order to reduce the weight and cost of the pole, usually, methods such as partially rolling and thinning the pole or removing the connecting member are adopted to reduce the weight of the pole. However, these weight reduction means will lead to a decrease in the current passing area of the cell and a higher temperature rise, affecting the safety and reliability of the cell.
Summary of the Invention
Problems to be Solved by the Invention
[0004] The technical problem to be solved by the present disclosure is to provide a cover assembly and a battery including the same in order to overcome the defects of the prior art.
Means for Solving the Problems
[0005] This disclosure addresses the aforementioned technical challenges through the following proposed technologies. A cover assembly comprising a cover body, an electrode lead member, an external conductive member, and a heat dissipation material, wherein the external conductive member is provided with a through-connection hole, the electrode lead member has a connecting portion, the electrode lead member is provided through the cover body and is connected to the external conductive member at the connecting hole via the connecting portion of the electrode lead member, and the heat dissipation material is installed in the connecting hole and in contact with the connecting portion.
[0006] The cover assembly is formed by the combination of an electrode lead member and an external conductive member installed on the cover body, and a heat dissipation material is installed at the connection point between the two, simultaneously absorbing the heat from both the electrode lead member and the external conductive member. The heat dissipation material simultaneously contacts both the electrode lead member and the external conductive member, indirectly increasing the contact area between them and preventing excessive localized temperature rise. Therefore, the proposed structure allows the cover assembly to effectively control temperature rise, achieve material savings while ensuring reliability, and reduce weight and cost.
[0007] Preferably, the heat dissipation material covers the connection hole.
[0008] By installing heat dissipation material to cover the entire connection hole, the heat dissipation effect is improved.
[0009] Preferably, the cover assembly further includes a positioning member, which is installed in the connection hole and covers the surface of the heat dissipation material away from the connection.
[0010] By installing a positioning member and covering the heat dissipation material, the objective of positioning the heat dissipation material is achieved, and the heat dissipation material is held to be located within the connection hole.
[0011] Preferably, the positioning member has a positioning portion on the surface facing away from the heat dissipation material, and the positioning portion is used for identification by a welding device.
[0012] By installing a positioning section on the surface of the positioning member, identification and positioning by the welding device is facilitated when welding to the end face of the external conductive member, improving the welding effect and meeting the requirements for high-precision welding.
[0013] Preferably, the external conductive member includes a second metal member and a first metal member, wherein the second metal member and the first metal member are made of different materials, the electrode lead member is connected to the connection hole located in the second metal member via the connection portion, and the second metal member and the first metal member are fitted together.
[0014] By installing a first metal component and a second metal component made of two different materials and combining them using a fitting method to form an external conductive component, the difficulty of welding between different metal materials is solved.
[0015] Preferably, the first metal member is provided with a plurality of insertion portions that protrude toward the second metal member, and the second metal member is provided with fitting portions that correspond one-to-one with the insertion portions, and the first metal member and the second metal member are fitted together through the insertion portions and the fitting portions.
[0016] By installing multiple corresponding insertion and fitting portions between the first and second metal members and fitting them together, it is possible to improve the connection reliability between the first and second metal members and simultaneously increase the current passage area.
[0017] Preferably, the first metal member and the second metal member sequentially define the connection hole along the axial direction of the connection hole, and the heat dissipation material is installed within the connection hole and in contact with the first metal member and the second metal member, respectively.
[0018] In a situation where the first and second metal members sequentially define the connection holes, the contact area between the heat dissipation material and the external conductive member is increased by maintaining contact between the heat dissipation material located within the connection holes and both the first and second metal members. At the same time, it is also possible to indirectly improve the contact area between the first and second metal members, thereby improving the heat dissipation effect.
[0019] Preferably, a first recess is provided on the surface of the wall of the connection hole, and the heat dissipation material is placed in the first recess.
[0020] By providing a first recess on the surface of the hole wall of the connection hole and placing the heat dissipation material within the first recess, a larger amount of heat dissipation material can be accommodated. At the same time, the contact area between the heat dissipation material and the external conductive member is increased, improving the heat dissipation effect.
[0021] Preferably, a second recess is provided on the surface of the region of the electrode extraction member located within the connection hole, and the heat dissipation material is placed within the second recess.
[0022] A second recess is provided on the surface of the region located within the connection hole of the electrode extraction member, and by placing the heat dissipation material in the second recess, more heat dissipation material can be accommodated. At the same time, the contact area between the heat dissipation material and the electrode extraction member is increased, improving the heat dissipation effect.
[0023] Preferably, the electrode extraction member and the external conductive member are welded together at the connection hole.
[0024] It is also possible to weld the electrode lead member and the external conductive member together to improve the strength of the connection between them and simultaneously increase the current passage area.
[0025] Preferably, the heat dissipation material is a phase change material.
[0026] Compared to using other materials, using phase-change materials allows for a relatively larger amount of heat absorption, and improves heat dissipation while maintaining weight reduction.
[0027] A battery comprising: the above-described cover assembly, a case, wherein the cover assembly covers an opening of the case and together with the case defines a housing chamber for housing cells.
Advantages of the Invention
[0028] The positive and progressive effects of the present disclosure are as follows. In the cover assembly and the battery containing the same, the cover assembly is formed as a whole by a method in which an electrode lead-out member and an external conductive member installed on a cover body are combined with each other, and a heat dissipation material is installed at a connection portion between the two to simultaneously absorb the heat amounts of the electrode lead-out member and the external conductive member through the heat dissipation material. The heat dissipation material simultaneously contacts the electrode lead-out member and the external conductive member, indirectly increases the contact area between the electrode lead-out member and the external conductive member, and avoids excessive local temperature rise. Therefore, with this structural installation solution, the cover assembly can effectively control the temperature rise, save the material usage amount on the premise of ensuring the use reliability, and achieve the purpose of reducing the weight and cost.
Brief Description of the Drawings
[0029] [Figure 1] It is a structural explanatory diagram of the cover assembly of Example 1 of the present disclosure. [Figure 2] It is a cross-sectional view taken at the position A-A in FIG. 1. [Figure 3] It is a partially enlarged view of part B in FIG. 2. [Figure 4] It is a structural explanatory diagram of the external conductive member of Example 1 of the present disclosure. [Figure 5] ?[[ID=?39]]It is an exploded structural explanatory diagram of the external conductive member of Example?1 of the present disclosure. [Figure 6] It is a structural explanatory diagram of the external conductive member in another possible solution 1 in Example 1 of the present disclosure. [Figure 7] Note: There may be a small error in the original text at ID=38 where it says "<\(0000115?\)". It should probably be "<\(0000115\)>". And in the translation of ID=39, the "Example?" should be "Example 1" for better accuracy. But I translated it as it was provided.This is an exploded view illustrating the structure of an external conductive member in another possible solution 1 in Embodiment 1 of the present disclosure. [Figure 8] This is a diagram illustrating the structure of the second metal member in another possible solution 1 in Embodiment 1 of the present disclosure. [Figure 9] This diagram illustrates the structure of the external conductive member and insulating member in another possible solution 2 in Example 1 of the present disclosure. [Figure 10] This is a diagram illustrating the structure of an external conductive member in another implementable version 3 of Embodiment 1 of the present disclosure. [Figure 11] This is an exploded view illustrating the structure of an external conductive member in another possible solution 3 in Example 1 of the present disclosure. [Figure 12] This is a diagram illustrating the structure of the cover assembly of Embodiment 2 of the present disclosure. [Figure 13] This is a magnified view of section D in Figure 12. [Figure 14] This is a diagram illustrating the structure of the cover assembly of Embodiment 3 of the present disclosure. [Figure 15] This is a magnified view of section E in Figure 14. [Figure 16] This is an exploded view illustrating the structure of the heat dissipation material and positioning member in the cover assembly of Embodiment 3 of the present disclosure. [Modes for carrying out the invention]
[0030] Preferred embodiments are given below and, in conjunction with the accompanying drawings, will give a clearer and more complete explanation of this disclosure.
[0031] Example 1
[0032] This embodiment provides a battery comprising a case, a cover assembly, and cells. In this battery, the cover assembly covers an opening on the case and, together with the case, partitions a housing chamber, which is used to house the cells. Specifically, electrodes are provided on the cells and are electrically connected to electrode lead members in the cover assembly.
[0033] Specifically, as shown in Figures 1 to 4, the cover assembly 100 in this embodiment includes a cover body 1, an electrode pull-out member 2, an external conductive member 3, and a heat dissipation material 4. The external conductive member 3 is provided with a vertically penetrating connection hole 3a (see Figure 4), and the electrode pull-out member 2 has a connection portion 2a. After the electrode pull-out member 2 penetrates the cover body 1 upward, it is connected to the external conductive member 3 at the connection hole 3a via the connection portion 2a of the electrode pull-out member 2, thereby achieving an electrical connection between the electrode pull-out member 2 and the external conductive member 3. The heat dissipation material 4 is installed inside the connection hole 3a, and the lower surface of the heat dissipation material 4 is in contact with the connection portion 2a of the electrode pull-out member 2. Furthermore, in order to prevent the cover body 1 from becoming conductive to the electrode pull-out member 2 and the external conductive member 3, an insulating member 6 is installed on the outer circumference of the electrode pull-out member 2 and the external conductive member 3, as shown in Figure 3, and is isolated from the cover body 1 through the insulating member 6. In this embodiment, the insulating member 6 is formed through an injection molding process in the gap formed between the electrode lead member 2 and the external conductive member 3 after they have been attached to the cover body 1.
[0034] The cover assembly 100 is formed by the combination of an electrode lead member 2 and an external conductive member 3 installed on the cover body 1, and a heat dissipation material 4 is installed at the connection point between the two, simultaneously absorbing the heat from the electrode lead member 2 and the external conductive member 3 through the heat dissipation material 4. The heat dissipation material 4 is in contact with the electrode lead member 2 and the external conductive member 3 at the same time, indirectly increasing the contact area between the electrode lead member 2 and the external conductive member 3, thereby avoiding excessive localized temperature rise. Therefore, the proposed structure allows the cover assembly 100 to effectively control temperature rise, save material usage, and reduce weight and cost while ensuring reliability.
[0035] In this embodiment, the heat dissipation material 4 installed at the connection between the electrode extraction member 2 and the external conductive member 3 is a phase-change material. Compared to using other materials, the amount of heat that can be absorbed is relatively larger, and the heat dissipation effect can be improved while maintaining weight reduction. Naturally, in other embodiments, a heat dissipation material 4 other than a phase-change material may be installed at the connection between the electrode extraction member 2 and the external conductive member 3, enabling the cover assembly 100 to effectively control the temperature rise and achieve the objective of saving material usage and reducing weight and cost while ensuring reliability. Furthermore, to prevent the heat dissipation material 4 from falling out of the connection hole 3a, the heat dissipation material 4 can be fixed inside the connection hole 3a by an adhesive method.
[0036] Specifically, the specific structure of the connection between the electrode lead member 2 and the external conductive member 3 of the cover assembly 100 in this embodiment is shown in Figure 3. As can be seen from Figure 3, the heat dissipation material 4 covers the entire connection hole 3a, and the heat dissipation effect is further improved by increasing the area covered by the heat dissipation material 4 within the connection hole 3a. Also, as shown in Figure 3, in this embodiment, the electrode lead member 2 and the external conductive member 3 are connected by welding at the connection hole 3a. The welded connection between the electrode lead member 2 and the external conductive member 3 can improve the degree of connection strength between them and can also increase the current passage area. Furthermore, if a welded connection is made between the electrode lead member 2 and the external conductive member 3, a weld mark will be present in the connection hole 3a area, making oxidation and corrosion extremely easy to occur. At this time, covering the entire connection hole 3a with the heat dissipation material 4 provides a sealing effect to the welded area, preventing oxidation, corrosion, and other conditions from appearing in the welded area.
[0037] As shown in Figures 3 and 4, in this embodiment, the external conductive member 3 is not a single component, but is composed of a combination of a first metal member 31 and a second metal member 32. The second metal member 32 and the first metal member 31 are made of different materials, and specifically, a reliable connection and conductivity between them are achieved through a mating process. The electrode extraction member 2 connects to the connection hole 3a located in the second metal member 32 via the connection portion 2a, thereby achieving both a physical and electrical connection between the external conductive member 3 and the second metal member 32. In this invention, the problem of difficulty in welding between different metal materials is solved by installing a first metal member 31 and a second metal member 32 made of two different materials and combining them in a mating manner to form the external conductive member 3. Specifically, the material of the second metal member 32 connected to the electrode lead member 2 should be compatible with the material of the electrode lead member 2, and the material of the first metal member 31 connected to the external lead wire, busbar, etc. should be compatible with the material of the external lead wire, busbar, etc. This effectively solves problems such as the difficulty of welding between different metal materials and the unreliability of the connection strength after welding.
[0038] Specifically, as shown in Figures 4 and 5, in order to improve the mating connection strength between the first metal member 31 and the second metal member 32, the lower surface of the first metal member 31 has four downwardly extending insertion portions 311, and these four insertion portions 311 are fixed into the four mating portions 321 of the second metal member 32 through a mating method, thereby realizing a reliable connection between the first metal member 31 and the second metal member 32. To further improve the reliability of the connection between the two, welding can be performed at the joint surface in the basis of the mating connection, which can improve the degree of connection rigidity between the two and also increase the current passage area. Furthermore, this mating rivet process has a simpler structure and lower processing costs compared to other mating connection processes, which can further reduce the cost of manufacturing the external conductive member 3.
[0039] Furthermore, as shown in Figure 5, in this embodiment, the fitting portion 321 penetrates the second metal member 32 vertically, specifically, it penetrates the second metal member 32 along the downward insertion direction of the insertion portion 311 (i.e., the axial direction C of the connection hole 3a), allowing the insertion portion 311 to protrude from the lower surface of the second metal member 32. This structural configuration makes the resulting fitting structure more reliable. Based on this, as can be seen from Figure 5, along the downward insertion direction of the insertion portion 311, the fitting portion 321 has a change in cross-sectional shape, and the circumferential surface of the insertion portion 311 and the hole wall shape of the fitting portion 321 are matched, further improving the connection strength when the fitting portion 321 and the insertion portion 311 are fitted together. Specifically, each fitting portion 321 is composed of two through holes of different diameters, a first through hole 3211 and a second through hole 3212, respectively. The projection of the first through hole 3211 lies within the projection range of the second through hole 3212, creating a drop in the hole wall of the stepped through hole. This allows the insertion portion 311 to be fitted into it, improving the degree of tightness of the connection between the insertion portion 311 and the fitting portion 321 when riveted, making it difficult for the first metal member 31 to detach from the second metal member 32 even under external force. Specifically, the second through hole 3212, located at the lowest end of the fitting portion 321, is a convex portion with a constant cross-section. This structure provides stronger tensile strength when connecting and fitting with the insertion portion 311 compared to other concave shapes, resulting in a better connection effect.
[0040] Naturally, in other feasible designs, the insertion portion 311 and the fitting portion 321 can employ other structures to achieve riveted fitting and improve the reliability of the connection between the first metal member 31 and the second metal member 32. Here, we present three other feasible designs.
[0041] Feasible Option 1: The specific structure is as shown in Figures 6, 7, and 8. The fitting portion 321 installed on the second metal member 32 is similarly a through hole that penetrates vertically and is similarly a stepped through hole composed of a first through hole 3211 and a second through hole 3212. The difference is that the second through hole 3212, located at the lowest end of the fitting portion 321, is a through hole with a variable cross-section (see Figure 8 for details). Along the downward insertion direction of the insertion portion 311 (i.e., the axial direction C of the connection hole 3a), the recess of the variable cross-section takes on a trumpet shape, and its cross-sectional shape gradually changes from small to large. Through this structure, when the fitting connection between the insertion portion 311 and the fitting portion 321 is achieved through material deformation processes such as riveting and pressing, the material at the end of the insertion portion 311 is more easily filled into the trumpet-shaped fitting portion 321, and the riveting effect of the first metal member 31 and the second metal member 32 can be improved.
[0042] Feasible Option 2: The specific structure, as shown in Figure 9, is such that the fitting portion 321 installed on the second metal member 32 is also a through-hole extending vertically, and the insertion portion 311 on the first metal member 31 does not protrude completely from the fitting portion 321, and a recess exists on the lower surface of the second metal layer 32. Therefore, the surface of the insulating member 6 facing the second metal member 32 has a corresponding anti-rotation portion 61, and the insertion of the anti-rotation portion 61 into the fitting portion 321 of the second metal member 32 improves the connection positioning effect between the insulating member 6 and the second metal member 32, and better prevents the external conductive member 3 from rotating relative to the insulating member 6.
[0043] Naturally, in other embodiments, the anti-rotation portion 61 located within the insulating member 6 may be an inwardly concave recessed structure. In this case, the insertion portion 311 on the first metal member 31 can protrude from the surface of the second metal member 32, and the objective of preventing the external conductive member 3 from rotating relative to the insulating member 6 is achieved through the fitting of the insertion portion 311 and the anti-rotation portion 41.
[0044] Feasible Option 3: The specific structure, as shown in Figures 10 and 11, is not integrally molded, but rather a relative combined connection between the first metal member 31 and the insertion part 311. Specifically, as shown in Figure 10, the first metal member 31 has a vertically penetrating mounting part 313, which is used to accommodate the insertion part 311. Specifically, the mounting part 313 is a stepped through-hole composed of a third through-hole 3131 and a fourth through-hole 3132. In this configuration, the fourth through-hole 3132 penetrates the first through-hole 3131, and along the downward insertion direction of the insertion part 311, the projection of the fourth through-hole 3132 lies within the projection range of the third through-hole 3131. After the insertion part 311 is mounted downward to the mounting part 313, the mounting part 313 imposes a downward positional restriction on the insertion part 311, preventing the insertion part 311 from continuing to move downward.
[0045] Subsequently, as shown in Figure 11, the first metal member 31 is attached to the second metal member 32 below it, and fitting is performed through the fitting of the insertion portion 311 and the fitting portion 321 of the second metal member 32, thereby riveting and positioning the two. Furthermore, the insertion portion 311 and the second metal member 32 are similarly fitted and connected, thereby achieving a reliable connection between the first metal member 31 and the second metal member 32 through the insertion portion 311 which is independent of the first metal member 31.
[0046] This structural installation plan allows for convenient removal and replacement of the insertion part 311, and eliminates the need to rework the first metal member 31 when replacing the insertion part 311, resulting in better structural versatility and maintainability.
[0047] In this embodiment, the first metal member 31 and the second metal member 32 sequentially define the connection hole 3a along the axial direction C of the connection hole 3a, and the heat dissipation material 4 is installed within the connection hole 3a and in contact with the first metal member 31 and the second metal member 32, respectively. Specifically, as shown in Figure 4, in this embodiment, the first metal member 31 and the second metal member 32 have different diameters at the positions where they form the connection hole 3a, and in the situation where the heat dissipation material 4 is installed within the connection hole 3a, the heat dissipation material 4 can cover the boundary portion 3b between the first metal member 31 and the second metal member 32, thereby achieving the objective of sealing the boundary portion 3b between the first metal member 31 and the second metal member 32, which are made of different materials.
[0048] Example 2 This embodiment further provides a cover assembly 100 whose structure is substantially the same as the cover assembly 100 provided in Embodiment 1, with the following differences. In this embodiment, as shown in Figures 12 and 13, a first recess 3c is provided on the surface of the hole wall of the connection hole of the external conductive member 3, and the heat dissipation material 4 is further placed in the first recess 3c. By placing the heat dissipation material 4 in the first recess 3c, more heat dissipation material 4 can be accommodated. At the same time, this structural arrangement can increase the contact area between the heat dissipation material 4 and the external conductive member 3, further improving the heat dissipation effect.
[0049] Specifically, as shown in Figure 13, in this embodiment, the external conductive member 3 is similarly constructed by fitting together a first metal member 31 and a second metal member 32, and the first recess 3c is formed on the surface of the hole wall of the connecting hole corresponding to the first metal member 31.
[0050] Naturally, in other embodiments, a second recess (not shown) that is recessed downwards may be provided on the surface of the region where the electrode extraction member 2 is located within the connection hole 3a, thereby allowing the lower surface of the heat dissipation material 4 to be placed within the second recess, thereby achieving the objectives of accommodating more heat dissipation material 4, increasing the contact area between the heat dissipation material 4 and the electrode extraction member 2, and further improving the heat dissipation effect.
[0051] In more favorable circumstances, a first recess 3c may be formed in the external conductive member 3 and a second recess in the electrode extraction member 2 at the same time, further increasing the volume of heat dissipation material 4 that can be accommodated and increasing the contact area between the electrode extraction member 2 and the external conductive member 3.
[0052] Example 3
[0053] This embodiment further provides a cover assembly 100, the structure of which is substantially the same as the cover assembly 100 provided in Embodiment 1, with the following differences. In this embodiment, as shown in Figures 14 and 15, the cover assembly 100 further includes a positioning member 5, which is similarly installed in a connection hole 3a formed in the center of the external conductive member 3 and covers the surface of the heat dissipation material 4 away from the connection portion 2a. By installing the positioning member 5 and covering the heat dissipation material 4, the purpose of positioning the heat dissipation material 4 is achieved, and the heat dissipation material 4 is kept in position within the connection hole 3a. Specifically, if the material of the positioning member 5 is metal, it can be fixed in the connection hole 3a by adhesive, or it can be welded to the hole wall of the connection hole 3a. On the other hand, if the material of the positioning member 5 is plastic, it can be fixed in the connection hole 3a by adhesive.
[0054] Furthermore, as shown in Figures 15 and 16, a positioning portion 51 is installed on the surface of the positioning member 5 that is away from the heat dissipation material 4 (i.e., the upper surface of the positioning member 5), and the positioning portion 51 is used for identification by the welding device. By installing the positioning portion 51 on the surface of the positioning member 5, it is made easier for the welding device to identify and position it when welding to the end face of the external conductive member 3, thereby improving the welding effect and meeting the requirements for high-precision welding.
[0055] Specifically, the positioning portion 51 in this embodiment is a recess formed on the surface of the positioning member 5, specifically a circular hole-shaped recess (see Figure 15 for details), which satisfies the purpose of identification and positioning by an automatic welding device and further facilitates the execution of the welding process. To further reduce the difficulty of welding and positioning, the positioning portion 51 is preferentially formed at the central position of the positioning member 5.
[0056] Naturally, in other embodiments, the positioning portion 51 may employ a non-recessed structure to achieve the purpose of identification by an automatic welding device. For example, the positioning portion 51 may be a cylindrical or rectangular protrusion formed on the surface of the positioning member 5, and specific examples will not be described in detail here.
[0057] While specific implementations of the Disclosure have been described above, those skilled in the art should understand that these are merely illustrative descriptions and that the scope of protection of the Disclosure is limited by the attached claims. Those skilled in the art may make various changes or modifications to these implementations, provided they do not deviate from the principles and substance of the Disclosure, and all such changes and modifications are included within the scope of protection of the Disclosure. [Explanation of Symbols]
[0058] 100 Cover Assembly 1 Cover body 2 Electrode extraction member 2a Connection part 3. External conductive members 3a Connection hole 3b Boundary 3c First recess 31 First metal component 311 Insertion part 32 Second Metal Component 321 Fitting part 4 Heat dissipation material 5 Positioning member 51 Positioning section 6. Insulating material 61 Anti-rotation part
Claims
1. The cover body includes an electrode lead member, an external conductive member, and a heat dissipation material. The external conductive member is provided with a through-connection hole. The electrode extraction member has a connecting portion, The electrode extraction member is provided through the cover body and is connected to the external conductive member at the connection hole via the connection portion of the electrode extraction member. The heat dissipation material is installed in the connection hole and in contact with the connection portion. A cover assembly characterized by the following features.
2. The heat dissipation material covers the connection hole. The cover assembly according to claim 1.
3. The cover assembly further includes a positioning member, The positioning member is installed in the connection hole and covers the surface of the heat dissipation material that is away from the connection portion. The cover assembly according to claim 2.
4. The positioning member has a positioning portion on the surface that is away from the heat dissipation material, The positioning unit is used for identification by the welding device. The cover assembly according to claim 3.
5. The external conductive member includes a second metal member and a first metal member. The second metal member and the first metal member are made of different materials. The electrode extraction member is connected to the connection hole located in the second metal member via the connection portion. The second metal member and the first metal member are fitted together. The cover assembly according to claim 1.
6. The first metal member is provided with a plurality of insertion portions that protrude toward the second metal member. The second metal member is provided with a fitting portion that corresponds one-to-one with the insertion portion. The first metal member and the second metal member are fitted together through the insertion portion and the fitting portion. The cover assembly according to claim 5, characterized in that it is as described above.
7. Along the axial direction of the connection hole, the first metal member and the second metal member sequentially define the connection hole. The heat dissipation material is installed in the connection hole and is in contact with the first metal member and the second metal member, respectively. The cover assembly according to claim 5, characterized in that it is as described above.
8. A first recess is provided on the surface of the hole wall of the connection hole. The heat dissipation material is installed in the first recess, The cover assembly according to any one of claims 1 to 7, characterized by the features described herein.
9. A second recess is provided on the surface of the region of the electrode extraction member located within the connection hole. The heat dissipation material is installed in the second recess. The cover assembly according to any one of claims 1 to 7, characterized by the features described herein.
10. The electrode extraction member and the external conductive member are welded together in the connection hole. The cover assembly according to any one of claims 1 to 7, characterized by the features described herein.
11. The aforementioned heat dissipation material is a phase change material. The cover assembly according to any one of claims 1 to 7, characterized by the features described herein.
12. A cover assembly according to any one of claims 1 to 11, The case and Includes, The cover assembly covers the opening of the case and, together with the case, partitions the housing chamber, which is used to house the cell. A battery characterized by the following features.