Battery cell packaging structure and battery

Abstract

The utility model provides a kind of electric core packaging structure and battery, including insulating film and electric core, electric core includes outer circumferential surface and the end face at the both ends of outer circumferential surface, end face is provided with tab, insulating film includes cladding part and extension, cladding part cladding in the outer circumferential surface of electric core, the extension is extended by the edge of cladding part to the position away from cladding part, and the extension is folded to the end face of electric core, the position of the extension is formed with avoidance area, and the tab is placed in the avoidance area.The electric core packaging structure provided by the utility model uses the avoidance area formed by extension to position and protect tab, and at the same time, it is beneficial to the cladding part to cladding the outer circumferential surface of electric core, to realize insulation effect, further avoid the complex assembly process in traditional insulation structure, i.e. the electric core packaging structure provided by the present application can also realize multiple technical effects of simplifying process, improving battery energy density and reducing cost on the basis of playing an insulating role.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cell packaging structure and a battery. Background Technology

[0002] The design of the battery cell structure must ensure safety, guarantee the energy density of the cell, and also consider the cost, manufacturing feasibility, and manufacturing efficiency of the cell.

[0003] Traditional battery cells with terminals on both sides typically have an insulating protective structure consisting of an insulating spacer, an insulating side plate, and adhesive applied to the large surface of the core. Alternatively, the insulating spacer can be combined with a Mylar film (the Mylar film is heat-fused onto the spacer). While these components can achieve insulation, the structure is complex, which is not conducive to cost savings. Furthermore, the insulating protective structure composed of multiple components occupies too much space, further affecting the improvement of battery energy density. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the assembly process of multiple structural components in the existing battery cell insulation protection structure is complicated and cumbersome, which affects the energy density of the battery. This utility model provides a battery cell packaging structure and a battery.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A battery cell packaging structure is provided, including an insulating film and a battery cell. The battery cell includes an outer peripheral surface and end faces located at both ends of the outer peripheral surface. The end faces are provided with tabs. The insulating film includes a covering portion and an extension portion. The covering portion covers the outer peripheral surface of the battery cell. The extension portion extends from the edge of the covering portion to a position away from the covering portion, and the extension portion is folded to the end face of the battery cell. A clearance area is formed at the position of the extension portion, and the tabs are placed in the clearance area.

[0007] Optionally, the electrode includes a first electrode and a second electrode, which are respectively disposed on two end faces of the battery cell. The number of extensions is two, and the first electrode and the second electrode are respectively located in the avoidance areas of the two extensions.

[0008] Optionally, the covering portion is provided with two first crease lines and two second crease lines, the two first crease lines and the two second crease lines are parallel to each other, and the two first crease lines are located between the two second crease lines. The covering portion forms a first covering surface between the two first crease lines, a second covering surface between the first crease lines and the second crease lines, and a third covering surface between the second crease lines and the edge of the covering portion.

[0009] The outer peripheral surface includes a first surface, a second surface, and two side surfaces. The first surface and the second surface are the largest surfaces of the battery cell. The side surfaces are respectively connected to the first surface and the second surface. The first covering surface covers the first surface of the battery cell. The two second covering surfaces are folded along the two first fold lines and then cover the two side surfaces respectively. The two third covering surfaces are folded along the second fold lines and then abut against each other to cover the second surface.

[0010] Optionally, the extension extends from the edge of the first covering surface and folds over to the end face of the battery cell, and the edge of the extension abuts against the edge of the second covering surface and the edge of the third covering surface, respectively.

[0011] Optionally, the cell packaging structure further includes adhesive, which is applied at the junction of the extension and the second covering surface, the junction of the extension and the third covering surface, and the junction of the two third covering surfaces for fixation.

[0012] Optionally, a third crease line is provided at the junction of the extension and the covering part, and the extension is folded over at the position of the third crease line.

[0013] Optionally, the extension includes a first extension and a second extension, the first extension and the second extension being spaced apart at the edge of the covering portion, and the avoidance area being formed between the first extension and the second extension.

[0014] Optionally, the insulating film is selected from PP film or PET film.

[0015] Optionally, the thickness of the insulating film is 0.01-1 mm.

[0016] On the other hand, this application provides a battery including a cover plate, a housing, and the aforementioned cell packaging structure, wherein the cell packaging structure is placed in the housing, and the cover plate seals the housing.

[0017] The beneficial effects of this application are as follows:

[0018] The battery cell packaging structure provided in this application includes an insulating film and a battery cell. The insulating film includes a covering portion and an extension portion. The extension portion forms a clearance area to position and protect the tabs. At the same time, the covering portion covers the outer periphery of the battery cell to achieve an insulation effect. This application uses an insulating film to replace the combination of multiple structural components such as insulating spacers and insulating side plates in traditional insulation structures, reducing the space occupied inside the battery and improving the energy density of the battery. In addition, the use of an insulating film to cover the battery cell in this application further avoids the complex assembly process in traditional insulation structures and can also reduce production costs. That is, the insulating film in the battery cell packaging structure provided in this application can achieve multiple technical effects such as simplifying the process, improving battery energy density, and reducing costs, while playing an insulating role. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the battery cell packaging structure provided by this utility model;

[0020] Figure 2 This is a schematic diagram of the insulating film structure provided by this utility model;

[0021] Figure 3 This is a schematic diagram of the battery cell structure provided by this utility model;

[0022] Figure 4 This is a schematic diagram of the battery structure provided by this utility model.

[0023] The reference numerals in the accompanying drawings are as follows:

[0024] 1. Insulating film; 11. Covering part; 111. First covering surface; 112. Second covering surface; 113. Third covering surface; 12. Extension part; 121. First extension part; 122. Second extension part; 2. Battery cell; 21. Outer peripheral surface; 211. First surface; 212. Second surface; 213. Side surface; 22. End face; 3. Tab; 31. First tab; 32. Second tab; 4. Clearance area; 5. First crease line; 6. Second crease line; 7. Adhesive; 8. Third crease line; 9. Cover plate; 10. Housing. Detailed Implementation

[0025] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Reference Figure 1 This utility model provides a battery cell packaging structure, including an insulating film 1 and a battery cell 2. The battery cell 2 includes an outer peripheral surface 21 and end faces 22 located at both ends of the outer peripheral surface 21. The end faces 22 are provided with tabs 3. The insulating film 1 includes a covering portion 11 and an extension portion 12. The covering portion 11 covers the outer peripheral surface 21 of the battery cell 2. The extension portion 12 extends from the edge of the covering portion 11 to a position away from the covering portion 11, and the extension portion 12 is folded to the end face 22 of the battery cell 2. A clearance area 4 is formed at the position of the extension portion 12, and the tabs 3 are placed in the clearance area 4.

[0029] Specifically, in the battery cell packaging structure provided in this application, the covering portion 11 of the insulating film 1 is tightly attached to the outer peripheral surface 21 of the battery cell 2, and the extension portion 12 extends from the edge of the covering portion 11 in a distance direction and is folded to the end face 22 of the battery cell 2. A clearance area 4 for avoiding the tab 3 is formed in the extension portion 12. This arrangement, on the one hand, ensures the insulation isolation between the tab 3 and the battery cell body and the external environment by covering the outer peripheral surface 21 and the end face 22 of the battery cell 2 with the insulating film 1. On the other hand, the structure of the extension portion 12 folded to the end face 22 reduces the use of excess insulating material in traditional packaging. The connection between the clearance area 4 and the tab 3 does not require much extra space, thereby maximizing the effective space for the battery cell 2 within a limited volume, reducing the encroachment of the packaging material on the volume of the battery cell 2, and thus improving the overall energy density.

[0030] Referring to 2-3, in one embodiment, the tab 3 includes a first tab 31 and a second tab 32, the first tab 31 and the second tab 32 are respectively disposed on the end faces 22 at both ends of the battery cell 2, and the number of extensions 12 is two, the first tab 31 and the second tab 32 are respectively located in the avoidance areas 4 of the two extensions 12.

[0031] Specifically, the two extensions 12 are folded to the end faces 22 at both ends of the battery cell 2. The avoidance areas 4 of the two extensions 12 provide accommodating space for the first tab 31 and the second tab 32, respectively, to prevent the tab 3 from short-circuiting with other components of the end face 22. At the same time, the dispersed arrangement of the tabs 3 on the end faces 22 at both ends can reduce the space occupied by the stacking of tabs 3 on the same end face 22.

[0032] The extension portion 12 extends and folds along the edge of the covering portion 11, so that the insulating film 1 fits tightly against the end face 22 of the cell 2 without the need to increase the thickness of the insulating layer. In addition, the clearance area 4 is opened according to the shape of the first tab 31 and the second tab 32, so as to avoid reserving excessive volume space, thereby reducing the occupation of the encapsulation material on the internal space of the cell 2, so that the cell 2 can be filled with more active material in a limited volume, thereby increasing the energy density.

[0033] The corresponding arrangement of the two extensions 12 and the two tabs (first tab 31 and second tab 32) is conducive to the integrated integration of the insulation of the end faces 22 at both ends of the cell 2 and the connection of the tabs 3. Compared with the traditional cell with tabs on a single end face, the structure with tabs on both ends can shorten the connection path between the tabs 3 and the external circuit, reduce the space occupied by the connecting parts, further optimize the compactness of the overall structure, and create conditions for improving energy density.

[0034] Reference Figure 2 In one embodiment, the covering portion 11 is provided with two first crease lines 5 and two second crease lines 6, the two first crease lines 5 and the two second crease lines 6 are parallel to each other, and the two first crease lines 5 are located between the two second crease lines 6. The covering portion 11 forms a first covering surface 111 between the two first crease lines 5, a second covering surface 112 between the first crease lines 5 and the second crease lines 6, and a third covering surface 113 between the second crease lines 6 and the edge of the covering portion 11.

[0035] The outer peripheral surface 21 includes a first surface 211, a second surface 212, and two side surfaces 213. The first surface 211 and the second surface 212 are the largest surfaces of the battery cell 2. The side surfaces 213 are respectively connected to the first surface 211 and the second surface 212. The first covering surface 111 covers the first surface 211 of the battery cell 2. The two second covering surfaces 112 are folded along the two first fold lines 5 and then cover the two side surfaces 213 respectively. The two third covering surfaces 113 are folded along the second fold line 6 and then abut against each other to cover the second surface 212.

[0036] Specifically, the insulating film 1 covering part 11 achieves adhesion to the outer peripheral surface 21 of the battery cell 2 through two first fold lines 5 and two second fold lines 6, thereby improving energy density while ensuring insulation performance. Two first fold lines 5 and two second fold lines 6 are distributed in parallel, dividing the covering part 11 into a first covering surface 111, a second covering surface 112, and a third covering surface 113, which respectively correspond to the largest surface, side surface 213, and another largest surface of the battery cell 2. The first covering surface 111 directly covers the first surface 211 of the battery cell 2. The two second covering surfaces 112 are folded along the first fold line 5 to cover the two side surfaces 213. The third covering surface 113 is folded along the second fold line 6 and then abuts against each other to complete the covering of the second surface 212. This allows the insulating film 1 to fit tightly against the outer periphery of the battery cell 2, avoiding wrinkles and gaps, reducing the amount of encapsulation material used, maximizing the effective internal space of the battery cell 2 without increasing the overall volume, and improving the battery energy density. In a further preferred embodiment, micropores can be provided along the positions of the first fold line 5 and the second fold line 6. After being covered by the insulating film 1, heat dissipation can be achieved through the micropores on the first fold line 5 and the second fold line 6.

[0037] In one embodiment, the extension 12 extends from the edge of the first covering surface 111 and folds over to the end face 22 of the cell 2, and the edge of the extension 12 abuts against the edge of the second covering surface 112 and the edge of the third covering surface 113, respectively.

[0038] Specifically, the extension 12 extends from the edge of the first covering surface 111, folds over to the end face 22 of the cell 2, and its edge precisely abuts against the edges of the second and third covering surfaces to form a seamless insulating structure. This structure enhances the insulation protection between the end face 22 and the outer peripheral surface 21 through the tight fit of the edges of the first covering surface 111, the second covering surface 112, and the third covering surface 113 of the covering part 11. On the other hand, the integrated design of the extension 12 and the covering surface avoids the extra gaps and material stacking caused by splicing, so that the insulating film 1 can achieve all-round coverage of the cell 2 with the smallest volume.

[0039] In one embodiment, the battery cell packaging structure further includes adhesive 7, which is applied to the junction of the extension 12 and the second covering surface 112, the junction of the extension 12 and the third covering surface 113, and the junction of the two third covering surfaces 113 for fixation.

[0040] Specifically, adhesive 7 is applied at the junctions of the extension 12 with the second covering surface 112 and the third covering surface 113, as well as at the junctions of the two third covering surfaces 113. This effectively fixes each part of the insulating film 1, preventing the covering layer from shifting or loosening due to vibration and deformation during the use of the battery cell 2. This ensures that the tab 3 is always in the insulation protection of the avoidance zone 4, preventing short circuits. At the same time, the adhesive 7 tightly connects each area of ​​the insulating film 1, forming a tighter encapsulation structure and reducing the ineffective space caused by a loose structure. Compared with the traditional method of using a large area of ​​insulating material for reinforcement, the precise positioning of the adhesive 7 significantly reduces the amount of encapsulation material used, achieving efficient protection in a limited space, further improving energy density, and realizing insulation protection and overall electrical performance improvement for the battery.

[0041] In one embodiment, a third crease line 8 is provided at the junction of the extension portion 12 and the covering portion 11, and the extension portion 12 is folded over at the position of the third crease line 8.

[0042] Specifically, the third crease line 8 provides a basis for the folding of the extension 12, enabling the extension 12 to be folded at a regular angle to the end face 22 of the cell 2, ensuring the precise alignment of the avoidance area 4 and the tab 3, and improving the reliability of insulation protection.

[0043] In one embodiment, the extension 12 includes a first extension 121 and a second extension 122, the first extension 121 and the second extension 122 being spaced apart at the edge of the covering portion 11, and the avoidance area 4 being formed between the first extension 121 and the second extension 122.

[0044] Specifically, by setting the extension 12 as a first extension 121 and a second extension 122 spaced apart, and forming the avoidance area 4 between the first extension 121 and the second extension 122, the insulating film 1 can flexibly and precisely fit the tab 3 when covering the end face 22 of the battery cell 2, further optimizing the performance of the battery cell packaging structure, avoiding excessive compression or poor contact between the tab 3 and the insulating film 1, and ensuring the insulation effect.

[0045] In one embodiment, the insulating film 1 is selected from PP film or PET film.

[0046] Specifically, the PP film (polypropylene film) has excellent chemical stability and moisture resistance, effectively resisting the corrosion of chemicals such as electrolytes and preventing insulation failure. Its texture is flexible and its thickness is controllable, making it less prone to wrinkles when tightly fitting the outline of the battery cell 2, thus reducing ineffective space. At the same time, it has good electrical insulation properties, ensuring the safe operation of the battery cell 2. The PET film (polyethylene terephthalate film) has high mechanical strength and is not easily deformed under the thermal stress generated during the charging and discharging of the battery cell 2, maintaining the integrity of the encapsulation. Moreover, the PET film has a smooth surface and excellent insulation properties, effectively preventing the battery cell 2 from contacting external conductive materials. At the same time, its thin and light characteristics can reduce the weight and volume of the encapsulation, leaving more space inside the battery cell 2 for the filling of active materials. Both materials, while ensuring the insulation safety of the battery cell 2, optimize the encapsulation structure through their own characteristics, thereby improving the energy density and overall performance of the battery cell 2.

[0047] In one embodiment, the thickness of the insulating film 1 is 0.01-1 mm.

[0048] Specifically, in this application, the thickness of the insulating film 1 is set between 0.01-1mm. Within this thickness range, the insulating film 1 can effectively balance insulation performance and energy density. When the insulating film 1 is thin (e.g., 0.01mm), it has excellent flexibility, which allows it to fit tightly into the structure of the battery cell 2, reducing the redundancy of the packaging space and reducing the weight of the material. This leaves more space for the active material inside the battery cell 2, thereby increasing the energy density. When the insulating film 1 is thick (1mm), it can enhance physical protection and electrical insulation performance, effectively resisting external mechanical impacts and internal short-circuit risks, and ensuring the safe and stable operation of the battery cell 2. In other words, the insulating film 1 with a thickness range of 0.01-1mm can meet the requirements of the battery cell 2 for insulation, moisture protection, and corrosion protection, while avoiding material accumulation and space waste caused by excessive thickness. This improves safety while optimizing the utilization rate of the internal space of the battery cell 2, thereby effectively increasing the energy density.

[0049] Reference Figure 4 In another embodiment of this application, a battery is provided, including a cover plate 9, a housing 10 and the aforementioned cell packaging structure, wherein the cell packaging structure is placed in the housing 10 and the cover plate 9 covers the housing 10.

[0050] Specifically, the battery provided in this application includes the aforementioned cell packaging structure. The cell packaging structure, through the optimized arrangement of the insulating film 1 and the cell 2, achieves high energy density and reliable insulation within a limited space. After the cell packaging structure is placed in the housing 10, the housing 10 provides physical protection and mechanical support, which can resist external impacts and compression, protect the cell 2 from damage, and at the same time seal the internal environment to prevent the intrusion of moisture and dust from affecting the performance of the cell 2. The cover plate 9 seals the housing 10, and the battery with the cell packaging structure of this application is assembled, so that the battery can give full play to the advantages of high energy density and improve the overall performance of the battery while ensuring the safe operation of the cell 2.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electric cell packaging structure, characterized by comprising: The device includes an insulating film and a battery cell. The battery cell includes an outer peripheral surface and end faces located at both ends of the outer peripheral surface. The end faces are provided with tabs. The insulating film includes a covering portion and an extension portion. The covering portion covers the outer peripheral surface of the battery cell. The extension portion extends from the edge of the covering portion to a position away from the covering portion and is folded to the end face of the battery cell. A clearance area is formed at the position of the extension portion, and the tabs are placed in the clearance area.

2. The electric cell packaging structure according to claim 1, wherein, The electrode includes a first electrode and a second electrode, which are respectively disposed on two end faces of the battery cell. There are two extensions, and the first electrode and the second electrode are respectively located in the avoidance areas of the two extensions.

3. The cell packaging structure according to claim 1, characterized in that, The covering part is provided with two first crease lines and two second crease lines. The two first crease lines and the two second crease lines are parallel to each other, and the two first crease lines are located between the two second crease lines. The covering part forms a first covering surface between the two first crease lines, a second covering surface between the first crease lines and the second crease lines, and a third covering surface between the second crease lines and the edge of the covering part. The outer peripheral surface includes a first surface, a second surface, and two side surfaces. The first surface and the second surface are the largest surfaces of the battery cell. The side surfaces are respectively connected to the first surface and the second surface. The first covering surface covers the first surface of the battery cell. The two second covering surfaces are folded along the two first fold lines and then cover the two side surfaces respectively. The two third covering surfaces are folded along the second fold lines and then abut against each other to cover the second surface.

4. The cell packaging structure according to claim 3, characterized in that, The extension extends from the edge of the first covering surface and folds over to the end face of the battery cell, and the edges of the extension abut against the edges of the second covering surface and the third covering surface, respectively.

5. The cell packaging structure according to claim 4, characterized in that, The cell packaging structure also includes adhesive, which is applied to the junction of the extension and the second covering surface, the junction of the extension and the third covering surface, and the junction of the two third covering surfaces for fixation.

6. The cell packaging structure according to claim 1, characterized in that, A third crease line is provided at the junction of the extension and the covering part, and the extension is folded over at the position of the third crease line.

7. The cell packaging structure according to claim 1, characterized in that, The extension includes a first extension and a second extension, which are spaced apart at the edge of the covering portion, and the avoidance area is formed between the first extension and the second extension.

8. The cell packaging structure according to claim 1, characterized in that, The insulating film is selected from PP film or PET film.

9. The cell packaging structure according to claim 1, characterized in that, The thickness of the insulating film is 0.01-1mm.

10. A battery, characterized in that, The device includes a cover plate, a housing, and a cell packaging structure as described in any one of claims 1-9, wherein the cell packaging structure is placed in the housing, and the cover plate seals the housing.

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