An electric core cover plate, a blade electric core, a battery module and a battery pack
By adding an extension to the cell cover insulation and either cutting or retaining it, the problem of cell gap control was solved, improving the production quality and long-term reliability of the battery module.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG GEELY HLDG GRP CO LTD
- Filing Date
- 2025-09-01
- Publication Date
- 2026-08-04
AI Technical Summary
Existing technologies struggle to control cell gaps efficiently, cost-effectively, and adaptably, which impacts battery cycle life and safety.
An extension beyond the long side of the main body of the cover plate is added to the insulating part of the cell cover plate, and it is cut or retained according to the design gap of the cell, combined with a weakening structure to control the cell gap.
This enables efficient and low-cost control of cell gaps, improving production efficiency and the long-term reliability of battery modules.
Smart Images
Figure CN224595634U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to a cell cover, a blade cell, a battery module, and a battery pack. Background Technology
[0002] In the production process of short-blade modules, the main problem in the stacking process is how to accurately control the gap between the cells. Due to the thickness tolerance of the cells themselves, coupled with the assembly errors of the production tooling, the actual gap between the stacked cells may exceed the design limit or result in zero adhesion, both of which will affect the cycle life and safety of the battery. Specifically, excessive gaps between cells will not only cause relative displacement of the cells under vibration or impact conditions, potentially causing stress concentration at the tab connection points and affecting the battery management system's accurate monitoring of individual cell voltages, but will also significantly increase the interface contact thermal resistance, leading to an imbalance in the temperature field distribution inside the module. Zero adhesion will cause the cells to be squeezed together during charging, potentially causing deformation of the internal separator and increased internal resistance. Long-term use may also cause the positive electrode material to crack and fall off, and at low temperatures, it may also easily tear the weld joints.
[0003] Existing solutions primarily rely on high-precision tooling or passive compensation materials, but these methods all have significant drawbacks. While high-precision tooling can control the gap to some extent, it is costly and lacks adaptability, making it difficult to meet the production needs of different cell models. Using elastic materials to fill the gap can alleviate tolerance issues initially, but after long-term use, the material will experience creep or fatigue failure, making it impossible to sustain the designed gap. Therefore, a more efficient, low-cost, and adaptable gap control solution is urgently needed to improve the production quality and long-term reliability of short-blade modules. Utility Model Content
[0004] In view of this, the purpose of this application is to provide a cell cover, a blade cell, a battery module, and a battery pack to solve at least one of the above-mentioned technical problems.
[0005] In a first aspect, this application provides a battery cell cover plate, including a cover plate body, a first insulating member, a riveting member, a second insulating member, and a terminal post; the cover plate body is rectangular; the first insulating member is disposed on the outer surface of the cover plate body, the first insulating member includes a connecting portion and at least two extension portions, the connecting portion is provided with at least one extension portion on both sides of the two long sides of the cover plate body corresponding to the connecting portion, one end of each extension portion is connected to the connecting portion, and the other end extends in the direction of the long side on the same side and extends beyond the long side; the second insulating member is disposed on the inner surface of the cover plate body; the terminal post is disposed on the inner surface of the second insulating member, and a portion thereof passes through the second insulating member, the cover plate body, and the connecting portion in sequence and is connected to the riveting member.
[0006] In conjunction with the first aspect, in some alternative embodiments, the portion of the extension that extends beyond the long side is used to be cut off or retained according to the cell design gap.
[0007] In conjunction with the first aspect, in some alternative embodiments, the extension lengths of each extension are the same.
[0008] In conjunction with the first aspect, in some alternative embodiments, the extensions on both sides of the connection are arranged symmetrically about the short side centerline of the cover body, and the extension lengths of the extensions on each side are not exactly the same, so as to meet different cell design gaps.
[0009] In conjunction with the first aspect, in some alternative embodiments, each extension has a weakening structure at one end, which is used to reduce the local structural strength at one end of the extension, making the extension easier to break or separate at that location.
[0010] In conjunction with the first aspect, in some alternative implementations, the weakening structure is a groove, a through hole, a notch, or a combination thereof.
[0011] In conjunction with the first aspect, in some alternative embodiments, the connecting portion is also connected to the cover plate body and / or a riveting member.
[0012] Secondly, this application provides a blade battery cell, including the battery cell cover plate in any of the embodiments of the first aspect described above.
[0013] Thirdly, this application provides a battery module including the blade cell described in the second aspect above.
[0014] Fourthly, this application provides a battery pack including the battery module described in the third aspect above.
[0015] Based on the above technical solutions, the cell cover plate, blade cell, battery module, and battery pack provided in this application, by adding an extension portion beyond the long side of the cover plate body to the first insulating member of the cell cover plate, and by cutting or retaining the portion of the extension portion beyond the long side according to the required cell design gap, can conveniently and effectively control the cell gap when the blade cells are stacked. Combined with the low cost, easy processing, and sufficient structural strength of the first insulating member, this is a more efficient, low-cost, and highly adaptable cell gap control solution, suitable for the production of blade cells, battery modules, and battery packs, and can effectively improve production efficiency. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a front view of a battery cell cover provided in an embodiment of this application.
[0018] Figure 2 A front view of another cell cover provided in an embodiment of this application.
[0019] Figure 3 This is a schematic diagram of the structure of a blade battery cell provided in an embodiment of this application.
[0020] Figure 4 This is a schematic diagram of another blade battery cell provided in an embodiment of this application.
[0021] Figure 5 This is a schematic diagram of a stacked blade battery cell structure provided in an embodiment of this application.
[0022] Reference numerals: 100, cell cover plate; 10, cover plate body; 11, long side; 20, first insulating component; 21, connecting part; 22, extension part; 221, weakening structure; 30, riveting component; 40, pole post; 41, riveting component connecting part; 200, rectangular shell; 1000, blade cell. Detailed Implementation
[0023] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of them. Based on the description of this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.
[0024] In the description of this application, unless otherwise expressly specified and limited, the terms "connection," "setup," "installation," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0025] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “center,” “top,” “bottom,” “inner,” “outer,” “vertical,” “horizontal,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0026] The terms “first,” “second,” “third,” etc., are used only to distinguish elements with similar properties, and do not indicate or imply relative importance or a specific order, unless otherwise explicitly stated or limited.
[0027] The terms “comprising,” “including,” “having,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0028] The term "multiple" means two or more (including two).
[0029] The term "and / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone.
[0030] The terms "an embodiment," "as an example," and "in one implementation" refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which may be included in at least one embodiment or example of this application. These illustrative expressions do not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Where there is no conflict, the embodiments and features described in these embodiments can be combined in a suitable manner.
[0031] Figure 1 A front view of a cell cover 100 provided in an embodiment of this application, as shown below. Figure 1 As shown, this application provides a battery cell cover 100, including a cover body 10, a first insulating member 20, a riveting member 30, a second insulating member (not shown in the figure), and a terminal post 40.
[0032] The cover body 10 is used with the rectangular housing 200 of the blade cell 1000 (see...) Figure 3 The components are assembled to form a housing for the electrode assembly. A first insulating member 20 is disposed on the outer surface of the cover plate body 10, and a second insulating member is disposed on the inner surface of the cover plate body 10. An electrode post 40 is disposed on the inner surface of the second insulating member, and includes a riveting connection part 41 and an electrode assembly connection part (not shown in the figure). The riveting connection part 41 is columnar and passes through the second insulating member, the cover plate body 10, and the first insulating member 20 in sequence before connecting to the riveting member 30. The electrode assembly connection part is used to connect to the electrode assembly of the blade cell 1000.
[0033] The structure of the first insulating member 20 is a key part of the cell cover plate 100. Specifically, the first insulating member 20 includes a connecting portion 21 and at least two extension portions 22. The outer surface of the connecting portion 21 (the surface facing away from the cover plate body 10) may have a groove for accommodating the riveting member 30, so that the connecting portion 21 can be connected to the connecting portion 21 by covering. At least one extension portion 22 is provided on both sides of the two long sides 11 of the cover plate body 10 corresponding to the connecting portion 21. One end of each extension portion 22 is connected to the connecting portion 21, and the other end extends in the direction of the long side 11 on the same side of the cover plate body 10 and exceeds the long side 11. The part of the extension portion 22 that exceeds the long side 11 is used to cut or retain according to the cell design gap of the blade cells 1000 group. The connecting portion 21 can also be connected to the cover plate body 10 by integral injection molding, fasteners or other connection methods.
[0034] As an example, such as Figure 1 As shown, the grooves of both the riveting part 30 and the connecting part 21 are rectangular. When the riveting part 30 is placed in the groove, the connecting part 21 covers the riveting part 30.
[0035] As an example, such as Figure 1 As shown, there are six extensions 22, and three extensions 22 are provided on both sides of the connecting part 21 at equal intervals.
[0036] The extension lengths of each extension 22 can be the same. For example, Figure 1 As shown, the six extensions 22 have the same extension length. In use, the portion of each extension 22 that extends beyond the long side 11 can be trimmed according to the required cell design gap.
[0037] The extension lengths of the various extensions 22 may not be exactly the same. For example, Figure 2As shown, the six extensions 22 on both sides of the connecting portion 21 are symmetrically arranged about the center line of the short side of the cover body 10, and the extension lengths of the three extensions 22 on each side are different. For example, the extension lengths of the three extensions 22 on each side are designed to meet the cell design gaps of 0.5mm, 1.0mm, and 1.5mm, respectively. Each extension 22 has a weakening structure 221 at the end connected to the connecting portion 21. The weakening structure 221 is used to reduce the local structural strength at one end of the extension 22, making the extension 22 easier to break or separate at that location. Furthermore, when a cell design gap of 0.5mm, 1.0mm, or 1.5mm is required, only the corresponding extension 22 needs to be retained; the remaining extensions 22 can be removed using their respective weakening structures 221. This simplifies or saves on the cutting process and improves processing efficiency.
[0038] The weakening structure 221 can be a groove, a through hole, a notch, or other structural forms suitable for local structural weakening, or a combination thereof.
[0039] As an example, such as Figure 2 and Figure 4 As shown in the enlarged view, each extension 22 has a groove on the surface of the cover plate body 10 that is in close contact with it and at one end of the opposite surface. The groove extends in a direction parallel to the short side of the cover plate body 10. The groove can reduce the structural strength of the end of the extension 22 that is connected to the connecting part 21, making the extension 22 easy to break or separate at that position.
[0040] The structure of the second insulating element and the pole post 40 is not particularly required. For example, the structure of the second insulating element and the pole post disclosed in patent document CN118738755A and the structure of the lower insulating element and the pole post disclosed in CN118983588A can be referred to, and will not be specifically described here.
[0041] It should be noted that the first insulating component 20 is usually referred to as the upper plastic or other similar name, and the second insulating component is usually referred to as the lower plastic or other similar name.
[0042] Figure 3 This is a schematic diagram of the structure of a blade battery cell 1000 provided in an embodiment of this application, as shown below. Figure 3As shown in the figure, this application embodiment also provides a blade battery cell 1000, which includes two battery cell cover plates 100 as described in any of the above embodiments, a rectangular housing 200, and an electrode group (not shown in the figure). The cover plate bodies 10 of the two battery cell cover plates 100 and the rectangular housing 200 form a complete outer shell, and the electrode group is disposed in the outer shell and connected to the electrode posts 40 of the two battery cell cover plates 100. In each cover plate body 10, the extension lengths of the first insulating members 20 are the same. Before the blade battery cells 1000 are stacked into a group, according to the battery cell design gap, for each first insulating member 20, the portion of the other end of each extension 22 that extends beyond the long side 11 is uniformly cut off or retained.
[0043] Figure 4 This is a schematic diagram of another blade battery cell 1000 provided in an embodiment of this application, as shown below. Figure 4 As shown, this application embodiment also provides another blade battery cell 1000, which differs from the blade battery cell 1000 described above in that: in each cover plate body 10, the extension lengths of each extension portion 22 are not exactly the same. For example, the extension lengths of some extension portions 22 are designed to meet a 0.5mm battery cell design gap, some extension portions 22 are designed to meet a 1.0mm battery cell design gap, and some extension portions 22 are designed to meet a 1.5mm battery cell design gap; each extension portion 22 has a weakening structure 221 at the end connected to the connecting portion 21. Before the blade battery cells 1000 are stacked into a group, according to the battery cell design gap, for each first insulating member 20, the extension portion 22 that meets the battery cell design gap is retained, and the remaining extension portions 22 are removed using the weakening structure 221.
[0044] This application also provides a battery module, which includes the blade cell 1000 in any of the above embodiments.
[0045] As an example, such as Figure 5 As shown, multiple blade cells 1000 are stacked to form a battery module. For each blade cell 1000, the other end of the extension 22 of the first insulating member 20 abuts against the other end of the corresponding extension 22 in the adjacent blade cell 1000. Since the extension 22 extends beyond the corresponding long side 21 (that is, the large surface of the blade cell 1000) in the cell stacking direction, a gap is maintained between adjacent blade cells 1000 and the gap conforms to the cell design gap.
[0046] This application also provides a battery pack, which includes the battery module described above.
[0047] In summary, the cell cover, blade cell, battery module, and battery pack provided in this application embodiment, by adding an extension portion beyond the long side of the cover body to the first insulating member of the cell cover, and by cutting or retaining the portion of the extension portion beyond the long side according to the required cell design gap, can conveniently and effectively control the cell gap when stacking blade cells. Combined with the low cost, easy processing, and sufficient structural strength of the first insulating member, this is a more efficient, low-cost, and highly adaptable cell gap control solution, suitable for the production of blade cells, battery modules, and battery packs, and can effectively improve production efficiency.
[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application.
Claims
1. A battery cell cover plate, characterized in that, The device includes a cover plate body, a first insulating component, a riveting component, a second insulating component, and a pole post; the cover plate body is rectangular; the first insulating component is disposed on the outer surface of the cover plate body, and the first insulating component includes a connecting portion and at least two extension portions. The connecting portion is provided with at least one of the extension portions on both sides of the two long sides of the cover plate body, one end of each extension portion is connected to the connecting portion, and the other end extends in the direction of the long side on the same side and extends beyond the long side. The second insulating element is disposed on the inner surface of the cover plate body; The pole is located on the inner surface of the second insulating member, and a portion of it passes through the second insulating member, the cover plate body and the connecting part in sequence before being connected to the riveting member.
2. The cell cover plate according to claim 1, characterized in that, The portion of the extension that extends beyond the long side is used to be cut or retained according to the cell design gap.
3. The cell cover plate according to claim 1 or 2, characterized in that, The extension lengths of each of the aforementioned extensions are the same.
4. The cell cover plate according to claim 1 or 2, characterized in that, The extensions on both sides of the connection are symmetrically arranged about the center line of the short side of the cover plate body, and the extension lengths of the extensions on each side are not exactly the same, so as to meet different cell design gaps.
5. The cell cover plate according to claim 4, characterized in that, Each of the extensions has a weakening structure at one end, which is used to reduce the local structural strength at one end of the extension, making the extension easy to break or separate at that location.
6. The cell cover plate according to claim 5, characterized in that, The weakening structure is a groove, a through hole, a notch, or a combination thereof.
7. The cell cover plate according to claim 1, characterized in that, The connecting part is also connected to the cover plate body and / or the riveting component.
8. A blade battery cell, characterized in that, Includes the cell cover plate as described in any one of claims 1 to 7.
9. A battery module, characterized in that, Including the blade cell as described in claim 8.
10. A battery pack, characterized in that, Includes the battery module as described in claim 9.