Cover plate assembly, battery and battery pack
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-24
Smart Images
Figure CN224554459U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of battery technology and relates to a cover plate assembly, a battery, and a battery pack. Background Technology
[0002] Lithium-ion batteries typically consist of a casing, electrode arrays within the casing, a battery cover that seals the casing, and electrolyte injected into the casing through injection holes in the cover. The battery cover is assembled from components such as the cover body, terminals, sealing rings, and insulating parts. To ensure assembly precision, yield, and efficiency, a certain assembly gap is usually left between the tightly fitted components. However, electrolyte residue may remain in these gaps during the cell manufacturing process, and this electrolyte may affect the overall reliability of the battery due to chemical reactions during subsequent operation. Utility Model Content
[0003] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a cover plate assembly, a battery, and a battery pack to improve battery safety.
[0004] To achieve the above and other related objectives, in a first aspect, this application provides a cover plate assembly, comprising:
[0005] The cover plate body has through holes;
[0006] An insulating component includes an insulating body having a through hole for a pole post. The insulating body has a raised structure on a surface away from the cover plate body, the raised structure surrounding the circumferential edge of the through hole for the pole post. At least a portion of the raised structure has a guide portion, the guide portion being near the wall of the through hole for the pole post, and inclined in the thickness direction of the cover plate body from the direction closest to the cover plate body away from the cover plate body.
[0007] The pole includes a base plate and a main body connected together. The base plate is embedded in the pole limiting groove formed by the protruding structure, and the main body passes through the pole through hole and the through hole in sequence.
[0008] In an optional embodiment, the insulating body has a first sidewall and a second sidewall on the side surface away from the cover plate body, and the first sidewall and the second sidewall are spaced apart on opposite sides of the pole through hole in the width direction of the cover plate body.
[0009] The insulating component has two first ribs on its surface away from the cover plate body, and the two first ribs are spaced apart on opposite sides of the through hole of the pole post along the length direction of the cover plate body. Each first rib is connected between the first sidewall and the second sidewall.
[0010] The two first ribs, the portion of the first sidewall located between the two first ribs, and the portion of the second sidewall located between the two first ribs form the protruding structure, and the guide portion is disposed in at least one of the first ribs.
[0011] In an optional embodiment, the first rib with the flow guide is further provided with a support portion. In the width direction of the cover plate body, the support portion is adjacent to the flow guide portion, and the first rib is an integral structure. The support portion has a support surface away from the cover plate body.
[0012] Along the length of the cover plate body, the width of the supporting surface is W1, where 0.6mm ≤ W1 ≤ 1.2mm.
[0013] In an optional embodiment, the inclined portion of the guide section constitutes a guide surface, wherein the width of the guide surface projected onto the thickness direction of the cover plate body along the length direction of the cover plate body is W2.
[0014] In an optional embodiment, a plurality of the flow guides are provided on the same first rib. In the width direction of the cover plate body, the length of the first rib is W3, and the sum of the lengths of the flow guides in the same first rib is W4.
[0015] In an optional embodiment, the flow guide is connected to the first sidewall, and / or the flow guide is connected to the second sidewall.
[0016] In an optional embodiment, the insulating member has at least one second rib and at least one third rib on the side surface away from the cover plate body, and the extension direction of the second rib is different from that of the third rib in the thickness direction perpendicular to the cover plate body.
[0017] In an optional embodiment, the side of the guide portion away from the cover plate body has a gap with the bottom plate.
[0018] In a second aspect, this application provides a battery including a cover assembly as described in the first aspect.
[0019] Thirdly, this application provides a battery pack including the battery as described in the second aspect.
[0020] As described above, the cover plate assembly of this application provides a flow guide on at least one side wall of the electrode limiting groove of the insulating component to guide the electrolyte remaining in the assembly gap between the electrode and the insulating component during the cell manufacturing process. This avoids the electrolyte from remaining in the assembly gap for a long time, reduces the possibility of lithium dendrite growth and reduces the risk of internal short circuit, thereby improving the safety and service life of the battery.
[0021] The battery of this application, due to the assembly of the aforementioned cover plate, exhibits improved safety and reliability. The battery pack of this application, due to the presence of the aforementioned battery, also exhibits improved safety and reliability. Attached Figure Description
[0022] Figure 1 This is a structural schematic diagram of a cover plate assembly in related technologies.
[0023] Figure 2 For along Figure 1 A cross-sectional view at point A-A'.
[0024] Figure 3 This is a bottom view of the cover plate assembly provided in an embodiment of this application.
[0025] Figure 4 This is a top view of the cover plate assembly provided in an embodiment of this application.
[0026] Figure 5 This is a schematic diagram of the cross-section along point C-C' in the figure.
[0027] Figure 6 This is a schematic diagram of the overall structure of the insulating component provided in the embodiments of this application.
[0028] Figure 7 for Figure 6 The diagram shows a top view of the insulating component.
[0029] Figure 8 For along Figure 7 A cross-sectional view at point B-B'.
[0030] Figure 9 for Figure 8 Enlarged view of the dashed box P3.
[0031] Figure 10 for Figure 7 Enlarged view of the dashed box P2.
[0032] Figure 11 for Figure 10 A cross-sectional view of point P4 within the dashed box.
[0033] Explanation of reference numerals in the attached figures:
[0034] 101-Pole post, 102-Insulator, 103-Cover plate body;
[0035] 10-Insulating body, 11-Groove, 11a-First sidewall, 11b-Second sidewall, 111-Pole post limiting groove, 112-Pole post through hole, 12-First rib, 121-Guiding part, 1211-Guiding surface, 122-Supporting part, 13-Second rib, 14-Third rib; 20-Pole post, 21-Base plate, 22-Main body; 30-Cover plate body; 40-Riveting piece. Detailed Implementation
[0036] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application.
[0037] Please see Figures 1 to 11 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0038] Please see Figure 1 and Figure 2 ,in, Figure 1 A schematic diagram of the cover plate assembly in the related art is shown. Figure 2 It shows along Figure 1 A cross-sectional view at point A-A'. In related technologies, to ensure the positioning of the pole post 101, a limiting groove (not marked) is provided in the insulating member 102 located on one side of the cover plate body 103, so that the pole post 101 is embedded in the limiting groove for assembly with the insulating member 102. As described in the background art, in order to achieve the assembly and positioning of the pole post 101, a certain assembly gap (such as...) is usually reserved between the pole post 101 and the limiting groove. Figure 2 (As shown in the dashed box P1).
[0039] However, during the overall battery manufacturing process, some electrolyte may remain in the assembly gap. Furthermore, during battery operation, this residual electrolyte can react with the terminals, potentially causing corrosion of the terminals 101 and affecting performance. More importantly, the reaction can generate lithium dendrites, which may further contact the battery casing, leading to an internal short circuit and severely impacting battery safety and lifespan.
[0040] This application provides a cover plate assembly. By adjusting the structure of the insulating component in the cover plate assembly, electrolyte residue remaining in the assembly gap between the electrode and the insulating component can be guided, thereby avoiding reliability problems caused by electrolyte residue. Specific details are provided below. For illustrative purposes, the length direction of the cover plate body is defined as the X direction, the width direction as the Y direction, and the thickness direction as the Z direction. Furthermore, to avoid ambiguity, directions X and Z in the accompanying drawings refer to two sub-directions extending infinitely in that direction, and are not limited to just one sub-direction. For example, the Z direction includes both the +Z and -Z directions.
[0041] Please see Figures 3 to 5 This application provides a cover plate assembly, wherein... Figure 3 This is a bottom view of the cover plate assembly. Figure 4 This is a top view of the cover plate assembly. Figure 5 For along Figure 4 A cross-sectional view at point C-C'. The cover plate assembly includes a cover plate body 30, an insulating component, and a pole post 20.
[0042] Specifically, the cover plate body 30 has a through hole. Please refer to [link / reference]. Figure 3 , Figure 3 A schematic diagram of the overall structure of the insulating component is shown. The insulating component includes an insulating body 10, on which a pole-end through hole 112 is formed. A protruding structure is provided on the surface of the insulating body 10 away from the cover plate body 30, and the protruding structure surrounds the circumferential edge of the pole-end through hole 112. At least a portion of the protruding structure has a guide portion 121, which is located on the side wall near the pole-end through hole 112 and slopes in the thickness direction Z of the cover plate body 30 from near the cover plate body 30 to away from the cover plate body 30. The pole 20 includes a base plate 21 and a main body 22 connected together. The base plate 21 is embedded in the pole-end limiting groove 111 formed by the protruding structure, and the main body 22 passes sequentially through the pole-end through hole 112 and the through hole. (Please refer to the attached diagram for more details about the pole.) Figures 6 to 8 ,in, Figure 6 A top view of the insulating component is shown. Figure 7 It shows along Figure 6 A schematic cross-sectional view at point B-B'. Figure 8 It shows Figure 7 Enlarged view of the dashed box P3.
[0043] In this embodiment, by providing a guide portion 121 on at least one side wall of the electrode limiting groove 111, during the placement of the battery equipped with the insulating component, the guide portion 121 with an inclined surface (which can be considered as the wall surface being inclined away from the central axis of the electrode through hole 112 in the thickness direction Z of the cover plate body 30) guides the electrolyte remaining in the assembly gap between the electrode 20 and the insulating component during the cell manufacturing process. This prevents the electrolyte from remaining in the assembly gap for a long time, reduces the possibility of lithium dendrite growth, and reduces the risk of internal short circuit, thereby improving the safety and service life of the battery. In a specific example, the insulating component can be the lower plastic in the cover plate assembly.
[0044] In some embodiments, such as Figure 6 As shown, the insulating body 10 has a first sidewall 11a and a second sidewall 11b on the surface away from the cover plate body 30. In the width direction Y of the cover plate body 30, the first sidewall 11a and the second sidewall 11b are spaced apart on opposite sides of the pole through hole 112. The insulating component also has two first ribs 12 on the surface away from the cover plate body 30. In the length direction X of the cover plate body 30, the two first ribs 12 are spaced apart on opposite sides of the pole through hole 112, and each first rib 12 is connected between the first sidewall 11a and the second sidewall 11b. The two first ribs 12, the portion of the first sidewall 11a located between the two first ribs 12, and the portion of the second sidewall 11b located between the two first ribs 12 form a protruding structure. A flow guide 121 is disposed in at least one of the first ribs 12. That is, at least one flow guide 121 can be provided in one of the first ribs 12, or at least one flow guide 121 can be provided in each of the first ribs 12. The location and number of flow guides 121 are selected based on actual needs. For example, when the conventional placement direction of the battery to which the insulating component is applied is fixed (related to the battery packaging method), the flow guide 121 provided in the lower first rib 12 can be used to guide the electrolyte when the battery is placed in a fixed direction. For example, a groove 11 can be provided on the side of the insulating body 10 away from the cover body 30, the first sidewall 11a and the second sidewall 11b are the two sidewalls of the groove 11 in the width direction Y of the cover body 30, and further, the first rib 12 is provided in the groove 11.
[0045] In this embodiment, the pole post limiting groove 111 is constructed from a protruding structure formed by the first sidewall 11a / second sidewall 11b and two first ribs 12. The flow guide 121 can be directly integrated based on the first ribs 12, achieving the integration of flow guidance and mechanical support functions without affecting the first ribs 12 themselves in constructing the pole post limiting groove 111 and effectively supporting the pole post 20. In the case of pole post limiting grooves 111 with other types of structures, the sidewalls of the pole post limiting groove 111 can be directly chamfered to form the flow guide 121.
[0046] In some embodiments, the flow guide 121 is connected to the first sidewall 11a, and / or the flow guide 121 is connected to the second sidewall 11b. That is, during the placement of the assembled battery (usually placed on its side, i.e., one of the outer surfaces of the insulating component in the length direction X of the cover plate body 30 is in contact with the placement area), the residual electrolyte will accumulate on the side wall of the terminal limiting groove 111 due to gravity, for example, on the side of one of the first ribs 12, and will also adhere to the angle formed by the first rib 12 and other side walls (e.g., the first side wall 11a or the second side wall 11b). The electrolyte located at the angle will not only adhere to the first rib 12, but will also partially adhere to other side walls. If the flow guide 121 is provided in the middle area of the first rib 12, most of the electrolyte near the area where the flow guide 121 is located will flow out of the assembly gap due to the flow guide effect of the flow guide 121, while the electrolyte located at the corner may continue to remain, causing subsequent internal short circuit problems. Therefore, in the width direction Y of the cover plate body 30, the flow guide 121 can be provided on both sides of the first rib 12 (i.e. connected to the first side wall 11a / second side wall 11b) to fully discharge the residual electrolyte.
[0047] In some embodiments, such as Figure 6 As shown, the first rib 12, which has a flow guide 121, also has a support 122. In the width direction Y of the cover body 30, the support 122 is adjacent to the flow guide 121, and the first rib 12 is an integral structure. The support 122 has a support surface away from the cover body 30. When the first rib 12 has the flow guide 121, the support 122 mainly provides a limiting effect for the electrode post 20 to meet the positioning and assembly requirements of the electrode post 20. From another perspective, for the first rib 12 with the flow guide 121, the entire first rib 12 cannot be chamfered to form the flow guide 121; otherwise, it will affect the limiting and supporting effect on the electrode post 20, and affect the overall structural reliability of the cover assembly and the battery.
[0048] Further, please refer to Figure 10 , Figure 10 It shows Figure 7Enlarged schematic diagram of the dashed frame P2. Along the length X of the cover plate body 30, the width of the support surface is W1, 0.6mm ≤ W1 ≤ 1.2mm. For example, W1 can be 0.6mm, 0.8mm, 1.0mm, or 1.2mm. If the width of the support surface is too small (e.g., less than 0.6mm), it may cause deformation of the first rib 12, affecting the assembly stability of the pole post 20. If the width of the support surface is too large (e.g., greater than 1.2mm), it will result in an additional increase in the thickness of the insulating parts and the cover plate assembly.
[0049] In some embodiments, such as Figure 10 As shown, in the guide portion 121, the portion inclined in the thickness direction Z of the cover plate body 30 from near the cover plate body 30 to away from the cover plate body 30 constitutes a guide surface 1211. The width of the orthographic projection of the guide surface 1211 onto the thickness direction Z of the cover plate body 30 in the length direction X is W2.
[0050] In a specific example, the flow guide 121 can be formed by chamfering a portion of the first rib 12. The width value of the flow guide surface 1211 corresponds to the width value of the portion of the flow guide 121 that is removed from the support portion 122. When W2 is too small (e.g., less than 0.3 mm), the chamfered structure is relatively small, and the flow guide surface 1211 is insufficient to achieve sufficient flow of residual electrolyte. Due to the adhesion of the electrolyte itself, some electrolyte may remain, leading to lithium dendrite growth. Conversely, when W2 is too large (e.g., greater than...), the flow guide surface 1211... In the case of [unclear context], the first rib 12 may be locally too thin due to the presence of the guide portion 121, resulting in insufficient mechanical strength. This could lead to deformation and breakage during the overall assembly of the cover plate assembly, affecting the mechanical structural stability and reliability of the electrode post 20 and the cover plate assembly. Therefore, setting W2 within the aforementioned range can balance the guiding effect on residual electrolyte with the overall structural strength of the first rib 12 (and even the insulating component and cover plate assembly), making it suitable for practical applications.
[0051] In some embodiments, such as Figure 6 As shown, the side of the flow guide 121 facing the electrode through hole 112 is inclined in the thickness direction Z of the cover plate body 30 from near the cover plate body 30 to away from the cover plate body 30. That is, the side of the flow guide 121 facing the electrode through hole 112 constitutes the flow guide surface 1211, which is conducive to the full flow of electrolyte and avoids electrolyte residue as much as possible. In fact, the electrolyte residue in the assembly gap is mainly in the area where the bottom wall of the electrode limiting groove 111 is located. If only the upper part of the flow guide 121 is chamfered, electrolyte residue may still exist and the expected effect cannot be achieved.
[0052] In some embodiments, such as Figure 10 As shown, the same first rib 12 is provided with multiple guide portions 121. In the width direction Y of the cover plate body 30, the length of the first rib 12 is W3, and the total length of the guide portions 121 in the same first rib 12 is W4. For example, such as Figure 10 As shown, two guide sections 121 are provided in the same first rib 12, and the length of the two guide sections 121 in the width direction Y of the cover plate body 30 is w, so W4 is 2w.
[0053] Furthermore, when multiple guide sections 121 are provided on the same first rib 12, the lengths w of the different guide sections 121 can be the same or different. Similarly, the inclination of the guide surfaces 1211 of the different guide sections 121 can also be the same or different; for example, the inclination angle can be set to a stepped change.
[0054] In some embodiments, the surface of the insulating member away from the cover plate body 30 is further provided with at least one second rib 13 and at least one third rib 14, and the extension direction of the second rib 13 and the extension direction of the third rib 14 are different in the thickness direction Z perpendicular to the cover plate body 30. To meet the assembly requirements of the terminal post 20 and the subsequent assembly requirements between the overall cover plate assembly and the battery casing, the first surface 10a of the insulating member is provided with a groove 11. Due to the groove 11, the area of the insulating member with the groove 11 is thinner than the area without the groove 11, which affects its mechanical strength. The provision of the second rib 13 and the third rib 14 enhances the overall mechanical structural stability of the insulating member.
[0055] Furthermore, such as Figure 6 and Figure 7 As shown, the insulating component includes a plurality of second ribs 13 and a plurality of third ribs 14. The plurality of second ribs 13 are spaced apart along the longitudinal direction X of the cover plate body 30, and each second rib 13 is connected between the first sidewall 11a and the second sidewall 11b. The third ribs 14 are connected between two adjacent second ribs 13, or the third ribs 14 are connected between the sidewall near the groove 11 and the first rib 12 (or the second rib 13). The second ribs 13 and the third ribs 14 (and the first ribs 12) form a reinforcing network to ensure the overall mechanical structural stability of the insulating component and the cover plate assembly.
[0056] In some embodiments, the side of the guide portion 121 away from the cover plate body 30 has a gap with the bottom plate 21. For example... Figure 11 As shown, the electrolyte remaining in the assembly gap between the electrode post 20 and the insulating component can flow out of the assembly space through the gap (along...). Figure 11(In the direction indicated by the dashed arrow in the middle), thereby improving the problem of residual electrolyte at the assembly gap causing subsequent lithium dendrite growth, reducing the risk of internal short circuits in the battery, and improving the reliability of the cover plate assembly.
[0057] In some embodiments, the cover plate assembly further includes a riveting member 40, which is located on the side of the cover plate body 30 away from the insulating member in the thickness direction Z of the cover plate body 30, and the pole post 20 is also connected to the riveting member 40.
[0058] The cover plate assembly of this application provides a flow guide 121 on at least one side wall of the electrode limiting groove 111 to guide the electrolyte remaining in the assembly gap between the electrode 20 and the insulating component during the cell manufacturing process. This prevents the electrolyte from remaining in the assembly gap for a long time, reduces the possibility of lithium dendrite growth and reduces the risk of internal short circuit, thereby improving the safety and service life of the battery.
[0059] This application also provides a battery, including the cover assembly described above.
[0060] The battery in this embodiment has improved safety and reliability due to the assembly of the aforementioned cover plate.
[0061] This application also provides a battery pack, including the battery as described above.
[0062] The battery pack of this application embodiment has improved safety and reliability due to the presence of the aforementioned battery.
[0063] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.
Claims
1. A cover plate assembly, characterized in that, include: The cover plate body has through holes; An insulating component includes an insulating body having a through hole for a pole post, and a raised structure on a side surface of the insulating body away from the cover plate body, the raised structure surrounding the circumferential edge of the through hole for the pole post; wherein at least a portion of the raised structure has a guide portion, the guide portion being inclined in the thickness direction of the cover plate body from the direction close to the cover plate body to the direction away from the cover plate body; The pole includes a base plate and a main body connected together. The base plate is embedded in the pole limiting groove formed by the protruding structure, and the main body passes through the pole through hole and the through hole in sequence.
2. The cover plate assembly according to claim 1, characterized in that: The insulating body has a first sidewall and a second sidewall on the surface away from the cover plate body. In the width direction of the cover plate body, the first sidewall and the second sidewall are spaced apart on opposite sides of the pole through hole. The insulating component has two first ribs on its surface away from the cover plate body, and the two first ribs are spaced apart on opposite sides of the through hole of the pole post along the length direction of the cover plate body. Each first rib is connected between the first sidewall and the second sidewall. The two first ribs, the portion of the first sidewall located between the two first ribs, and the portion of the second sidewall located between the two first ribs form the protruding structure, and the guide portion is disposed in at least one of the first ribs.
3. The cover plate assembly according to claim 2, characterized in that: The first rib, which has the flow guide portion, also has a support portion. In the width direction of the cover plate body, the support portion is adjacent to the flow guide portion, and the first rib is an integral structure. The support portion has a support surface away from the cover plate body; wherein... Along the length of the cover plate body, the width of the supporting surface is W1, where 0.6mm ≤ W1 ≤ 1.2mm.
4. The cover plate assembly according to claim 3, characterized in that: The inclined portion of the guide section constitutes a guide surface, wherein the width of the guide surface projected onto the thickness direction of the cover plate body along the length direction is W2.
5. The cover plate assembly according to claim 2, characterized in that: The same first rib has multiple flow guides. In the width direction of the cover plate body, the length of the first rib is W3, and the sum of the lengths of the flow guides in the same first rib is W4.
6. The cover plate assembly according to claim 2, characterized in that: The flow guide is connected to the first sidewall, and / or the flow guide is connected to the second sidewall.
7. The cover plate assembly according to claim 2, characterized in that: The insulating member has at least one second rib and at least one third rib on the side surface away from the cover plate body, and the extension direction of the second rib is different from that of the third rib in the thickness direction perpendicular to the cover plate body.
8. The cover plate assembly according to claim 1, characterized in that: There is a gap between the side of the guide portion away from the cover plate body and the bottom plate.
9. A battery, characterized in that: Includes the cover plate assembly as described in any one of claims 1 to 8.
10. A battery pack, characterized in that: Includes the battery as described in claim 9.