Battery cover plate assembly and battery
By setting limiting parts and non-circular column segments at both ends of the terminal unit, the problem of increased battery cover height was solved, thereby improving battery energy density and enhancing stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU TIANHE ENERGY STORAGE CO LTD
- Filing Date
- 2025-04-03
- Publication Date
- 2026-05-19
AI Technical Summary
The existing riveting structure of the battery cover increases the height of the cover, which leads to compression of the internal space of the battery and affects the energy density.
By setting a first limiting part and a second limiting part at both ends of the pole unit, and using the clamping cavity to fix and connect each structural component, the riveting structure is eliminated. The combination of non-circular column segments and through holes restricts rotation and improves torque bearing capacity.
The height of the cover plate assembly was reduced, which improved the energy density of the battery and the stability of the terminal units, as well as enhanced sealing and structural rigidity.
Smart Images
Figure CN224264152U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically providing a battery cover assembly and a battery. Background Technology
[0002] The cover plate is an important component in battery assembly. It is usually composed of multiple structural components such as aluminum sheet, upper and lower plastics, and terminals. After the various structural components are fixed and assembled, they form an integral cover plate.
[0003] Currently, the various structural components of the cover plate are generally connected as one unit by riveting. That is, the terminal post is riveted and fixed to the aluminum sheet, upper and lower plastic components, etc. by using riveting pieces or riveting blocks. However, since the riveting structure such as riveting pieces or riveting blocks has a certain height, this will increase the overall height of the cover plate after assembly. The increased height of the cover plate will cause the internal space of the battery to be compressed, thereby affecting the battery energy density.
[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Utility Model Content
[0005] This application aims to solve the aforementioned technical problem, namely, how to reduce the height of the battery cover.
[0006] In a first aspect, this application provides a battery cover assembly comprising:
[0007] A first insulating component, a cover plate body, and a second insulating component are stacked together.
[0008] The pole unit includes a pole body, a first limiting part connected to one end of the pole body, and a second limiting part connected to the other end of the pole body. The pole body passes through the first insulating member, the cover plate body, and the second insulating member in sequence. The first limiting part abuts against the first insulating member, and the second limiting part abuts against the second insulating member to limit the axial displacement of the pole body.
[0009] In one technical solution of the aforementioned battery cover assembly, the column includes:
[0010] The first column segment has a non-circular cross-section, and the cover plate body has a through hole adapted to the cross-sectional shape of the first column segment to restrict the rotation of the column.
[0011] In one technical solution of the above-mentioned battery cover assembly, the first column segment has a first end near the first insulating member and a second end near the second insulating member, and the second limiting portion is arranged along the edge trajectory of the second end of the first column segment.
[0012] In one technical solution of the above-mentioned battery cover assembly, the second limiting part includes a plurality of units spaced apart along the edge trajectory of the second end of the first column segment, and a gap is formed between adjacent units.
[0013] In one technical solution of the above-mentioned battery cover assembly, the second insulating member is provided with a plurality of protrusions spaced apart along the circumferential direction, the number of the protrusions being the same as the number of the unit, and the protrusions filling the gap.
[0014] In one technical solution of the above-mentioned battery cover assembly, the surface of the second limiting part away from the second insulating member is located in the same plane as the end face of the second end of the first column segment.
[0015] In one technical solution of the aforementioned battery cover assembly, the second limiting part is a flanged structure.
[0016] In one technical solution of the aforementioned battery cover assembly, the second limiting part is integrally formed with the first column segment.
[0017] In one technical solution of the aforementioned battery cover assembly, the column further includes:
[0018] The second column segment is connected to the first column segment. The cross-section of the second column segment is circular. The second column segment has a third end and a fourth end opposite to each other. The fourth end is closer to the second insulating member than the third end. The second limiting part is annular in shape and is arranged along the edge trajectory of the fourth end of the second column segment.
[0019] In one technical solution of the above-mentioned battery cover assembly, the surface of the second limiting part away from the second insulating member and the end face of the fourth end of the second column segment are located in the same plane.
[0020] In one technical solution of the aforementioned battery cover assembly, the second limiting part is a flanged structure.
[0021] In one technical solution of the above-mentioned battery cover assembly, the second limiting part and the second column segment are integrally formed.
[0022] In one technical solution of the aforementioned battery cover assembly, the cross-section of the first column segment is a regular polygon.
[0023] In a second aspect, this application provides a battery that includes the cover assembly described in any one of the first aspects.
[0024] As described above, by providing a first limiting part and a second limiting part at both ends of the column, this application forms a clamping cavity between the first limiting part and the column to clamp and fix the first insulating component, the cover plate body and the second insulating component. During the assembly of the battery cover plate assembly, the second limiting part is used to realize the fixed connection between the pole post unit and other functional components, without the need to add riveting structures or other connecting parts in the cover plate assembly, thereby reducing the height of the cover plate assembly and increasing the energy density of the battery.
[0025] Furthermore, this application provides a first column segment with a non-circular cross-section on the column body, and simultaneously opens a through hole on the cover plate body that matches the cross-sectional shape of the first column segment. The rotation of the pole column unit is restricted by the mutual cooperation between the inner walls of the through hole of the first column segment and the cover plate body. In this way, the torque bearing capacity of the pole column unit is improved by utilizing the structural rigidity of the cover plate body itself to cope with external forces, thereby improving the stability of the cover plate assembly. Attached Figure Description
[0026] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:
[0027] Figure 1 This is an exploded view of a battery cover assembly according to an embodiment of this application;
[0028] Figure 2 This is a top view of a battery cover assembly according to an embodiment of this application;
[0029] Figure 3 It is along Figure 2 Sectional view of line AA in the middle;
[0030] Figure 4 This is a front view of a pole post unit according to an embodiment of this application;
[0031] Figure 5 yes Figure 2 A magnified view of the location of the central pole unit;
[0032] Figure 6 This is a front view of a pole unit according to another embodiment of this application.
[0033] In the figure, the reference numerals refer to the following:
[0034] 1. First insulating component; 2. Cover plate body; 3. Second insulating component; 31. Protrusion; 4. Pole post unit; 41. Post body; 411. First post segment; 412. Second post segment; 42. First limiting part; 43. Second limiting part; 5. Sealing ring. Detailed Implementation
[0035] Preferred embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.
[0036] It should be noted that in the description of this application, terms such as "upper," "lower," "left," "right," "inner," and "outer," which indicate direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. These terms are used merely for ease of description and do not indicate or imply that the relevant device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0037] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0038] Reference Figure 1 This is an exploded view of a battery cover assembly according to an embodiment of this application, which includes a first insulating member 1, a cover body 2, and a second insulating member 3 stacked sequentially from bottom to top, and an electrode post unit 4 connected to the first insulating member 1, the cover body 2, and the second insulating member 3. It should be noted that "bottom" in the figure refers to the side of the cover assembly facing the battery cell after battery assembly, and "top" refers to the side of the cover assembly away from the battery cell after battery assembly.
[0039] It should be understood that a battery includes positive and negative electrodes. Therefore, the aforementioned terminal unit 4 in this application naturally has two units in the battery cover assembly, namely a positive terminal unit and a negative terminal unit. Both units perform the same function, so they are collectively referred to as terminal unit 4 in this application. Adaptively, based on the structural composition of the cover assembly, a second insulating member 3 is also provided for each terminal unit 4.
[0040] The cover plate body 2 can be made of aluminum sheet or other metal material. The first insulating component 1 is the lower plastic as described in the art, and the second insulating component 3 is the upper plastic as described in the art. The function of the first insulating component 1 and the second insulating component 3 is to form insulation between the pole post unit 4 and the cover plate body 2. Therefore, the first insulating component 1 and the second insulating component 3 can also be other insulating materials.
[0041] Reference Figure 2 , Figure 3 and Figure 4 ,in, Figure 2 This is a top view of a battery cover assembly according to an embodiment of this application. Figure 3 For along Figure 2 Sectional view of line AA in the middle. Figure 4 This is a front view of a pole unit according to an embodiment of this application.
[0042] The pole post unit 4 includes a column 41, a first limiting part 42, and a second limiting part 43. The column 41 passes through the first insulating member 1, the cover plate body 2, and the second insulating member 3 in sequence. One end of the column 41 is connected to the first limiting part 42, and the other end is connected to the second limiting part 43. The first limiting part 42 is engaged with the lower edge of the first insulating member 1 and abuts against the first insulating member 1. The second limiting part 43 is engaged with the upper edge of the second insulating member 3 and abuts against the second insulating member 3. The axial displacement of the column 41 is restricted by the first limiting part 42 and the second limiting part 43, so that the first insulating member 1, the cover plate body 2, the second insulating member 3, and the pole post unit 4 are connected as one unit.
[0043] In actual processing, the first limiting part 42 can be integrally formed with the column 41. The first limiting part 42 is a convex edge extending outward along the circumference of the end of the column 41, which is engaged with the inner side of the first insulating member. Before the battery cover assembly is assembled, the second limiting part 43 is a cylindrical structure fixedly connected to the end of the column 41 opposite to the first limiting part 42. The cylindrical structure is coaxial with the column 41. After the column 41 passes through the first insulating member 1, the cover body 2 and the second insulating member 3 in sequence, the second limiting part 43 abuts against the first insulating member 1. Then, the above-mentioned cylindrical structure is folded outward along the circumference until it abuts against the upper edge of the second insulating member 3, at which point the second limiting part 43 is formed.
[0044] As described above, this application provides a first limiting part 42 and a second limiting part 43 at both ends of the column 41, so that the first limiting part 42 and the second limiting part 43 form a clamping cavity between the column 41 and the column 41 to clamp and fix the first insulating member 1, the cover plate body 2 and the second insulating member 3. During the assembly of the battery cover plate assembly, the second limiting part 43 is used to realize the fixed connection between the pole post unit 4 and other functional components, without the need to add riveting structures or other connecting parts in the cover plate assembly, thereby reducing the height of the cover plate assembly and increasing the energy density of the battery.
[0045] Reference Figure 1 and Figure 3 Optionally, a sealing ring 5 is also provided between the second insulating element 3 and the cover plate body 2, which further improves the sealing performance of the cover plate assembly.
[0046] It should be noted that during the actual operation of the battery, external environmental factors (such as vibration and torsional conditions) may generate a certain torque on the terminal unit 4. Therefore, the terminal unit 4 needs to have a certain torque bearing capacity to cope with external forces. To this end, in the embodiments of this application, the column 41 includes at least a first column segment 411 with a non-circular cross-sectional shape. For example, the cross-section of the first column segment 411 can be polygonal, elliptical, oblong, or other irregularly shaped. The cover plate body 2 has a through hole adapted to the cross-sectional shape of the first column segment 411, thereby restricting the rotation of the terminal unit 4 through the mutual cooperation between the first column segment 411 and the inner wall of the through hole in the cover plate body 2. In this way, the torque bearing capacity of the terminal unit 4 is improved by utilizing the structural rigidity of the cover plate body 2 itself, without the need for other fasteners. Of course, in some implementations, to further improve the torque bearing capacity of the terminal unit 4, through holes adapted to the cross-sectional shape of the first column segment 411 can also be formed on the first insulating member 1 and / or the second insulating member 3.
[0047] In this application, the cross-sectional shape of the first column segment 411 is a regular polygon (the attached figure shows a regular hexagon, but it can also be a regular pentagon, etc.) as an example for illustration.
[0048] Reference Figure 4 and Figure 5 In one embodiment of this application, the column 41 includes only a first column segment 411 (at this time, the first column segment 411 is the column 41), the first column segment 411 has a first end near the first insulating member 1 and a second end near the second insulating member 3, and the second limiting part 43 is arranged along the edge trajectory of the second end of the first column segment 411.
[0049] It should be noted that since the first column segment 411 is a regular polygon, stress concentration will occur at the connection of adjacent sides during the folding process of the second limiting part 43. Therefore, in one implementation of this application, the second limiting part 43 is set as multiple independent units distributed at intervals along the edge trajectory of the second end of the first column segment 411, and gaps are formed between adjacent units.
[0050] In this way, the tearing caused by stress concentration during the folding process of the second limiting part 43 can be effectively avoided, which would lead to the failure of the second limiting part 43. At the same time, the second limiting part 43 is set as multiple units, and the multiple units simultaneously play the role of limiting the axial displacement of the first column segment 411, which will not affect the installation effect of the pole column unit 4.
[0051] Optionally, the second insulating member 3 is further provided with a plurality of protrusions 31 spaced circumferentially, the positions of the protrusions 31 corresponding one-to-one with the positions of the aforementioned notches. The protrusions 31 can be integrally formed on the second insulating member 3, so that the protrusions 31 precisely fill the notches formed after the multiple units of the second limiting part 43 are folded. By providing protrusions 31 on the second insulating member 3 and filling the notches with the protrusions 31, the integrity of the portion of the pole post unit 4 located on the outside of the cover plate assembly is ensured. The protrusions 31 can protect the multiple units of the second limiting part 43, thereby improving the overall structural strength of the cover plate assembly and preventing the second limiting part 43 from failing due to excessive wear caused by vibration, collision, or other reasons during long-term use of the battery.
[0052] Optionally, in one implementation, the surface of the second limiting part 43 facing away from the second insulating member 3 is located in the same plane as the end face of the second end of the first column segment 411. This can minimize the height of the battery cover assembly. When multiple batteries are assembled to form a battery pack, the reduction in the height of the battery cover assembly can increase the energy density of the entire battery pack.
[0053] In the above embodiments, the second limiting part 43 and the first column segment 411 can be selected as an integral structure, which can be integrally formed during the processing. Then, during the assembly of the battery cover assembly, the second limiting part 43 is folded to form a flange structure.
[0054] Reference Figure 6 In another embodiment of this application, the column 41 includes a first column segment 411 and a second column segment 412. The first column segment 411 and the second column segment 412 are coaxially connected to form an integral structure. The cross-section of the second column segment 412 is circular. The second column segment 412 has a third end near the first insulating member 1 and a fourth end near the second insulating member 3. The second limiting part 43 is a closed annular shape and is arranged along the edge trajectory of the fourth end of the second column segment 412.
[0055] As described above, by dividing the column 41 into a second column segment 412 with a circular cross-section and a first column segment 411 with a non-circular cross-section, the first column segment 411 is responsible for bearing the torque, while the second column segment 412 is set as a cylinder. During the folding process, the second limiting part 43 will not experience a large area of stress concentration in its circumference, thus maintaining the integrity of the second limiting part 43. Therefore, there is no need to cut or remove material from the second limiting part 43, nor is it necessary to form a protrusion on the second insulating part 3. This simplifies the processing technology of the cover plate assembly and improves production efficiency.
[0056] It should be noted that the dimensional relationship between the second column segment 412 and the first column segment 411 can be set as follows: Figure 6In the horizontal plane shown, the orthographic projection of the first column segment 411 overlaps the orthographic projection of the second column segment 412, thereby preventing the second column segment 412 from interfering with the installation of the second limiting part 43. The second limiting part 43 is a cylindrical structure with a circular cross-section between the folds. Since the outer surfaces of both the second limiting part 43 and the second column segment 412 are smooth curved surfaces, after the second limiting part 43 is folded to form a flange structure, a smooth transition arc surface is formed between the outer surface of the second column segment 412 and the flange structure formed by the second limiting part 43. The aforementioned transition arc surface between the second column segment 412 and the second limiting part 43 is similar to a rounded chamfer, thereby dispersing stress within the aforementioned arc surface and preventing stress concentration.
[0057] In the above embodiments, the second limiting part 43 and the second column segment 412 can be selected as an integral structure, which can be integrally formed during the processing. Then, during the assembly of the battery cover assembly, the second limiting part 43 is folded to form a flange structure.
[0058] Similarly, when the column 41 adopts the above-described structural form, the surface of the second limiting part 43 facing away from the second insulating member 3 can be located in the same plane as the end face of the fourth end of the second column segment 412, thereby minimizing the overall height of the cover plate assembly. Its technical effect is similar to that of the above-described embodiment, and will not be described in detail here.
[0059] This application also discloses a battery including the battery cover assembly of any of the above embodiments. In one embodiment of this application, the battery may be a prismatic battery, including a housing and a battery cell disposed within the housing. One side of the housing has an opening, and the battery cover assembly is installed in the opening to secure the battery cell within the housing.
[0060] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.
Claims
1. A battery cover plate assembly, characterized by, include: A first insulating component, a cover plate body, and a second insulating component are stacked together. The pole unit includes a pole body, a first limiting part connected to one end of the pole body, and a second limiting part connected to the other end of the pole body. The pole body passes through the first insulating member, the cover plate body, and the second insulating member in sequence. The first limiting part abuts against the first insulating member, and the second limiting part abuts against the second insulating member to limit the axial displacement of the pole body.
2. The cover plate assembly of claim 1, wherein, The column includes: The first column segment has a non-circular cross-section, and the cover plate body has a through hole adapted to the cross-sectional shape of the first column segment to restrict the rotation of the column.
3. The cover plate assembly of claim 2, wherein, The first column segment has a first end near the first insulating member and a second end near the second insulating member, and the second limiting portion is disposed along the edge trajectory of the second end of the first column segment.
4. The cover plate assembly of claim 3, wherein, The second limiting part includes a plurality of units spaced apart along the edge trajectory of the second end of the first column segment, with gaps formed between adjacent units.
5. The cover plate assembly of claim 4, wherein, The second insulating member has a plurality of protrusions spaced apart along the circumference, the number of which is the same as the number of the unit, and the protrusions fill the gap.
6. The cover plate assembly of claim 3, wherein, The surface of the second limiting part that is away from the second insulating member is in the same plane as the end face of the second end of the first column segment.
7. The cover plate assembly of claim 3, wherein, The second limiting part is a flanged structure.
8. The cover plate assembly of claim 3, wherein, The second limiting part is integrally formed with the first column segment.
9. The cover plate assembly of claim 2, wherein, The column also includes: The second column segment is connected to the first column segment. The cross-section of the second column segment is circular. The second column segment has a third end and a fourth end opposite to each other. The fourth end is closer to the second insulating member than the third end. The second limiting part is annular in shape and is arranged along the edge trajectory of the fourth end of the second column segment.
10. The cover plate assembly of claim 9, wherein, The surface of the second limiting part that is away from the second insulating member is in the same plane as the end face of the fourth end of the second column segment.
11. The cover plate assembly of claim 9, wherein, The second limiting part is a flanged structure.
12. The cover plate assembly of claim 11, wherein, The second limiting part is integrally formed with the second column segment.
13. The cover plate assembly of any one of claims 2-12, wherein, The cross-section of the first column segment is a regular polygon.
14. A battery, characterized by Includes the cover plate assembly according to any one of claims 1 to 13.