Battery cell and battery module
By improving the design of the coating film, adopting a three-layer overlapping area and a slit limit, the problems of poor insulation and low energy density caused by aluminum-cased cell coating were solved, achieving higher battery module energy density and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-04-07
AI Technical Summary
The current method of encapsulating aluminum-cased battery cells results in excessive thickness in the bottom opening or side wall folding area of the casing, affecting insulation performance and battery module energy density.
The first covering structure, the extended covering structure, and the second covering structure of the coating film are adopted. Through the design of slits and creases, three overlapping areas are formed to reduce the thickness of the folded area, and the distance at the slits is limited to reduce gaps and improve the bonding strength.
It effectively reduces the thickness and area of the overlapping area of the coating film, improves the energy density and insulation performance of the battery module, and reduces the possibility of coating film cracking.
Smart Images
Figure CN224096796U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and battery module. Background Technology
[0002] The outer shell of aluminum-cased battery cells is covered with an insulating film to achieve insulation. Currently, a single insulating film is typically used, and the outer shell of the battery cell is covered using a U-shaped or spiral-shaped wrapping method.
[0003] However, if a U-shaped wrapping method is used, an opening will be formed at the bottom of the cell's outer casing after wrapping. These openings will cause the bottom of the cell's outer casing to be exposed, resulting in poor insulation. If a U-shaped wrapping method is used, several folded areas will be formed on the side wall of the cell's outer casing. These folded areas have up to five overlapping layers of wrapping film, which is too thick. The folded areas are also large, and there is no adhesive layer on the back of the folded areas, making them prone to cracking when the cell is scratched. In addition, the excessively thick folded areas will occupy a certain amount of space on the outside of the battery, thereby reducing the energy density of the battery module.
[0004] Therefore, there is an urgent need for a type of battery cell and battery module to solve the above problems. Utility Model Content
[0005] According to one aspect of the present invention, the objective is to provide a battery cell that can reduce the possibility of the coating film cracking when subjected to scratches, and effectively reduce the space occupied by the overlapping area of the coating film on the outside of the battery cell, thereby improving the energy density of the battery module.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] Battery cells, including:
[0008] A housing, the housing comprising a bottom surface, two opposing first side surfaces, and two opposing second side surfaces;
[0009] A covering film, comprising a first covering structure, covering the bottom surface and the two first side surfaces;
[0010] The second covering structure is connected to the first covering structure and covers the second side;
[0011] An extended covering structure is connected between the second covering structure and the first covering structure, covering the outer side of the second covering structure and the second side, and partially overlapping with the second covering structure;
[0012] The extended covering structure has a slit, and the depth of the slit and the distance between the slit and the bottom surface are both less than the width of the extended covering structure.
[0013] As a preferred embodiment of the battery cell provided by this utility model, the extended covering structure, the second covering structure and the first covering structure form an intersection point, and a first crease is formed between the end of the cut and the intersection point;
[0014] The extended covering structure is divided by the cut and the first crease into a part covering the second side and a corner area. The corner area connects to the second covering structure and forms a third crease between the second covering structure and the second covering structure. The third crease corresponds to the side edge between the second side and the first side.
[0015] As a preferred embodiment of the battery cell provided by this utility model, the vertical distance between the cut and the third crease is 2-5 mm.
[0016] As a preferred embodiment of the battery cell provided by this utility model, the first covering structure includes a bottom covering portion and two first side portions, the second covering structure is connected to the bottom covering portion, the bottom covering portion covers the bottom surface, the two first side portions respectively cover the two first side portions, and a second crease is formed between the first side portions and the extended covering structure corresponding to the side edge between the first side portion and the second side portion.
[0017] As a preferred embodiment of the battery cell provided by this utility model, the vertical distance between the end of the cut and the second crease is 2-4 mm.
[0018] As a preferred embodiment of the battery cell provided by this utility model, the vertical distance between the end of the cut and the second crease is equal to the vertical distance between the cut and the third crease.
[0019] As a preferred embodiment of the battery cell provided by this utility model, the extended covering structures on both sides of the second covering structure partially overlap to form an extended overlapping area.
[0020] As a preferred embodiment of the battery cell provided by this utility model, the width of the extended overlapping area is 5 to 20 mm.
[0021] As a preferred embodiment of the battery cell provided by this utility model, the first covering structure includes a bottom covering part and two first side parts. The bottom covering part covers the bottom surface, and the two first side parts cover the two first side parts respectively. The first side parts protrude from the top of the shell and are folded and connected to the top of the battery cell.
[0022] According to another aspect of the present invention, the objective is to provide a battery module comprising a plurality of battery cells as described in any of the above embodiments, wherein the plurality of battery cells are arranged sequentially along a direction perpendicular to the first side surface.
[0023] The beneficial effects of this utility model are:
[0024] The battery cell provided by this utility model includes a housing and a coating film. The coating film includes a first coating structure, an extended coating structure, and a second coating structure. The first coating structure covers the bottom surface of the housing and the two first side surfaces of the housing. That is, through the first coating structure, the bottom and the two first side surfaces of the housing can be wrapped in a single layer.
[0025] The second covering structure is connected to the first covering structure and corresponds to the second side of the casing. Extended covering structures are respectively provided between the two sides of the second covering structure and the first covering structure. The extended covering structure and the second covering structure partially overlap, and the second side covers both the extended covering structure and the second covering structure. Through this arrangement, the overlapping area of the extended covering structure and the second covering structure forms a three-layer overlapping film. Compared to the five-layer overlapping area in the prior art, this effectively reduces the thickness of the overlapping area, thereby effectively reducing the space occupied by the overlapping area of the covering film on the outside of the battery cell and improving the energy density of the battery module.
[0026] The extended covering structure has a slit, the depth of which and the distance between the slit and the bottom surface are both less than the width of the extended covering structure. By limiting the length and location of the slit, the area of the non-adhesive overlapping region of the covering film on the second side of the shell can be minimized while ensuring the covering effect of the second side of the shell, thus reducing the possibility of the covering film cracking when subjected to scratches.
[0027] The battery module provided by this utility model includes several of the above-mentioned battery cells, which have high energy density and strong reliability. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0029] Figure 1 This is a schematic diagram of the housing and top cover provided in an embodiment of the present utility model;
[0030] Figure 2 This is a schematic diagram of the unfolded coating film provided in an embodiment of the present invention;
[0031] Figure 3 This is a schematic diagram of the side portion of the coating film covering the shell provided in this embodiment of the utility model. Figure 1 ;
[0032] Figure 4 This is a schematic diagram of the side portion of the coating film covering the shell provided in this embodiment of the utility model. Figure 2 ;
[0033] Figure 5 This is a side view of the shell completely covered by the coating film provided in this embodiment of the utility model.
[0034] In the picture:
[0035] 1. Intersection point; 2. Cut; 3. First crease; 4. Second crease; 5. Third crease; 6. Extended overlapping area; 7. Corner overlapping area;
[0036] 100. Shell; 110. Bottom surface; 120. First side surface; 130. Second side surface;
[0037] 200. Covering film; 210. First covering structure; 211. Bottom covering portion; 212. First side portion; 220. Extended covering structure; 221. Corner area; 230. Second covering structure;
[0038] 300. Top cover. Detailed Implementation
[0039] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0043] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0044] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connect," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0046] In this embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0047] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0048] Reference Figure 1This embodiment provides a battery cell. The battery cell includes a core and a housing 100. The core is disposed within the housing 100. The housing 100 includes a bottom surface 110, two opposing first side surfaces 120, and two opposing second side surfaces 130. The battery cell also includes a top cover 300, which covers the upper opening of the housing 100 directly opposite the bottom surface 110.
[0049] Reference Figures 2-5 The battery cell also includes a coating film 200, which wraps around the housing 100 and partially wraps around the top cover 300. Specifically, the coating film 200 can wrap the bottom surface 110, two opposing first side surfaces 120, and two opposing second side surfaces 130.
[0050] Specifically, the coating film 200 includes a first coating structure 210, an extended coating structure 220, and a second coating structure 230. The first coating structure 210 covers the bottom surface 110 and the two first side surfaces 120. The second coating structure 230 is connected to the first coating structure 210 and corresponds to the second side surface 130. The extended coating structures 220 are respectively disposed between the two sides of the second coating structure 230 and the first coating structure 210. The extended coating structures 220 and the second coating structure 230 partially overlap, and the second side surface 130 is covered within the extended coating structures 220 and the second coating structure 230.
[0051] More specifically, the first covering structure 210 includes a bottom covering portion 211 and two first side portions 212. The second covering structure 230 is connected to the bottom covering portion 211, which covers the bottom surface 110. The two first side portions 212 respectively cover the two first side surfaces 120. A second crease 4 is formed between the first side portions 212 and the extended covering structure 220 corresponding to the side edges between the first side surface 120 and the second side surface 130.
[0052] More specifically, the extended covering structure 220 is provided with a slit 2. In this embodiment, the extension direction of the slit 2 is parallel to the width direction of the extended covering structure 220. The extended covering structure 220, the second covering structure 230, and the first covering structure 210 form an intersection point 1. A first crease 3 is formed between the end of the slit 2 and the intersection point 1. The extended covering structure 220 is divided by the slit 2 and the first crease 3 into a portion covering the second side surface 130 and a corner area 221. The corner area 221 is connected to both sides of the second covering structure 230. A third crease 5 is formed between the second covering structure 230 and the corner area 221. The third crease 5 corresponds to the side edge between the second side surface 130 and the first side surface 120.
[0053] In other words, the aforementioned folded area 221 is formed between the cut 2, the first fold 3, and the third fold 5. This folded area 221 overlaps with the extended covering structure 220 and the second covering structure 230, forming a folded overlap area 7, as shown below. Figure 5 As shown. The second covering structure 230 and the extended covering structure 220 both cover the second side 130. The corner overlap area 7 is a part of the extended covering structure 220, the corner area 221 and a part of the second covering structure 230 stacked together. The corner overlap area 7 forms a three-layer overlap. Compared with the five-layer overlap in the prior art, it can effectively reduce the thickness of the corner overlap area 7, thereby effectively reducing the space occupied by the corner overlap area 7 on the outside of the cell and improving the energy density of the battery module.
[0054] Optionally, the depth of the slit 2 is less than the width of the extended covering structure 220. The distance between the slit 2 and the bottom surface 110 is also less than the width of the extended covering structure 220. By limiting the length and location of the slit 2 as described above, the area of the overlapping area 7 at the corner of the second side 130 can be minimized while ensuring the covering effect of the second side 130 of the housing 100, thereby reducing the possibility of the covering film cracking when subjected to scratches.
[0055] Specifically, in this embodiment, the vertical distance between the cut 2 and the third crease 5 is preferably 2 to 5 mm. The vertical distance between the end of the cut 2 and the second crease 4 is preferably 2 to 4 mm.
[0056] Since the second covering structure 230, after being covered by the second side surface 130, has no adhesiveness on the side facing away from the second side surface 130, and the corner overlap area 7 is formed by bonding the adhesive side of the corner area 221 to the adhesive side of the extended covering structure 220, the two sides of the resulting corner overlap area 7 are not adhesive. This results in a gap between the corner overlap area 7 and the second covering structure 230 after the corner overlap area 7 is covered by the second covering structure 230. This not only affects the bonding strength between the extended covering structure 220 and the second side surface 130 and the second covering structure 230, but also makes it easy for corrosive liquids or moisture to enter through the gap, affecting the overall insulation and corrosion protection of the shell 100. By setting the above distance, the area of the corner overlap area 7 can be minimized to reduce the size of the gap and solve the above problems.
[0057] More specifically, the vertical distance between the end of the cut 2 and the second fold 4 is equal to the vertical distance between the cut 2 and the third fold 5. With the above arrangement, after the covering film 200 is folded and wrapped, the second fold 4 can be aligned with the third fold 5, which facilitates wrapping and improves the neatness of the wrapped film 200.
[0058] More specifically, the extended covering structures 220 on both sides of the second covering structure 230 partially overlap to form an extended overlapping area 6. The formation of the extended overlapping area 6 ensures a reliable connection between the two extended covering structures 220 and guarantees the reliability of the covering film 200 in wrapping the second side 130.
[0059] Preferably, in this embodiment, the width of the extended overlapping area 6 is 5 to 20 mm.
[0060] Continue to refer to Figures 3-5 The upper edge of the first side portion 212 is higher than the top of the housing 100, and a portion of the first side portion 212 protruding from the top of the housing 100 is folded and connected to the top of the battery cell. An insulating patch is provided on the top cover 300, and a portion of the first side portion 212 protruding from the top of the housing 100 is folded and sandwiched between the insulating patch and the top cover 300.
[0061] This embodiment also provides a battery module, which includes a plurality of battery cells as provided in this embodiment. The plurality of battery cells are arranged sequentially along a direction perpendicular to the first side surface 120. Through the above arrangement, multiple battery cells can avoid the second side surface 130 in the arrangement direction, thereby avoiding the corner overlap area 7 and the extended overlap area 6 on the second side surface 130, and preventing the large thickness at these two locations from occupying the space between two battery cells and affecting the compactness of the arrangement.
[0062] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A battery cell, characterized in that, include: The housing (100) includes a bottom surface (110), two opposing first side surfaces (120) and two opposing second side surfaces (130); A covering film (200) includes a first covering structure (210) covering the bottom surface (110) and the two first side surfaces (120); The second covering structure (230) is connected to the first covering structure (210) and covers the second side (130); An extended covering structure (220) is connected between the second covering structure (230) and the first covering structure (210), covering the outside of the second covering structure (230) and the second side (130), and partially overlapping with the second covering structure (230); The extended covering structure (220) is provided with a slit (2), the depth of the slit (2) and the distance between the slit (2) and the bottom surface (110) are both less than the width of the extended covering structure (220).
2. The battery cell according to claim 1, characterized in that, The extended covering structure (220), the second covering structure (230), and the first covering structure (210) form an intersection point (1), and a first crease (3) is formed between the end of the cut (2) and the intersection point (1); The extended covering structure (220) is divided by the cut (2) and the first crease (3) into a part covering the second side surface (130) and a corner area (221). The corner area (221) connects the second covering structure (230) and forms a third crease (5) with the second covering structure (230). The third crease (5) corresponds to the side edge between the second side surface (130) and the first side surface (120).
3. The battery cell according to claim 2, characterized in that, The vertical distance between the cut (2) and the third crease (5) is 2-5 mm.
4. The battery cell according to claim 2, characterized in that, The first covering structure (210) includes a bottom covering portion (211) and two first side portions (212). The second covering structure (230) is connected to the bottom covering portion (211). The bottom covering portion (211) covers the bottom surface (110). The two first side portions (212) respectively cover the two first side surfaces (120). A second crease (4) is formed between the first side portion (212) and the extended covering structure (220) corresponding to the side edge between the first side surface (120) and the second side surface (130).
5. The battery cell according to claim 4, characterized in that, The vertical distance between the end of the cut (2) and the second crease (4) is 2-4 mm.
6. The battery cell according to claim 4, characterized in that, The vertical distance between the end of the cut (2) and the second crease (4) is equal to the vertical distance between the cut (2) and the third crease (5).
7. The battery cell according to claim 1, characterized in that, The extended covering structures (220) on both sides of the second covering structure (230) partially overlap to form an extended overlapping area (6).
8. The battery cell according to claim 7, characterized in that, The width of the extended overlapping area (6) is 5 to 20 mm.
9. The battery cell according to any one of claims 1-8, characterized in that, The first covering structure (210) includes a bottom covering part (211) and two first side parts (212). The bottom covering part (211) covers the bottom surface (110), and the two first side parts (212) respectively cover the two first side surfaces (120). The first side parts (212) protrude from the top of the housing (100) and are folded and connected to the top of the battery cell.
10. A battery module, characterized in that, It includes a plurality of battery cells as described in any one of claims 1-9, wherein the plurality of battery cells are arranged sequentially in a direction perpendicular to the first side surface (120).