Battery cell and battery pack

Abstract

The utility model relates to battery technical field discloses a kind of battery cell and battery pack, including, insulating film, it is wrapped in shell and cover plate, the first face of insulating film is attached to first large face, second face is attached to first narrow side, third face is attached to second large face, first flanging on the first face and second flanging on the third face are attached to second narrow side;Fourth face and fifth face are respectively attached to the cover plate surface of shell upper and lower two ends, third flanging on the fourth face and fourth flanging on the fifth face are attached on first large face or second large face;Interruption structure is equipped on the fourth face.The utility model divides insulating film as a whole into multiple faces, to reduce the splicing of insulating film, and fold flanging again, insulating film is bonded on shell and cover plate, improve insulating film wrapping efficiency and insulation reliability, and insulating film is not easy to make and rise, ensure the external insulation performance of battery cell.And interruption structure makes that pressure relief valve normal exhaust, and reduce cover plate exposed area, improve battery cell insulation reliability.

Description

Technical Field

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

[0002] Battery cells, such as lithium-ion cells, are widely used in various fields such as transportation power supply, power storage, new energy storage power supply, aerospace and military industries due to their advantages such as large capacity, high operating voltage, strong charge retention capability and long cycle life.

[0003] Currently, the common practice is to cover the outside of the battery cell casing with an insulating film as an insulating protective structure. In related technologies, such as blade batteries, the insulating film is wrapped around the outer surface of the casing, and then a top cover patch is installed. The insulating protective structure of the battery cell is formed by the cooperation between the top cover patch and the insulating film. However, the adhesion between the top cover patch and the insulating film has poor durability and is prone to peeling, resulting in insulation failure. Moreover, the overall assembly of blade batteries is relatively complex, affecting the assembly efficiency. Utility Model Content

[0004] In view of this, the present invention provides a battery cell and battery pack to solve the problems of insulation failure caused by insulation film peeling and low battery cell assembly efficiency.

[0005] In a first aspect, this utility model provides a battery cell, comprising: The housing has a first large surface and a second large surface disposed opposite to each other, and a first narrow side surface and a second narrow side surface disposed opposite to each other. A cover plate is installed at the upper and lower ends of the housing along the X direction; An insulating film includes a first side attached to a first large surface, the first side having a first flange attached to a second narrow side surface; a second side extending from the side of the first surface along the Y direction and attached to the first narrow side surface; a third side extending from the side of the second surface along the Y direction and attached to the second large surface, the third side having a second flange attached to the second narrow side surface; a fourth side extending from the top edge of the first surface along the X direction and attached to the surface of the cover plate at the upper end of the housing, the fourth side having a third flange attached to the second large surface; and a fifth side extending from the bottom edge of one of the first, second, and third surfaces along the X direction and attached to the surface of the cover plate at the lower end of the housing, the fifth side having a fourth flange attached to either the first large surface or the second large surface. The fourth surface is provided with an intermittent structure, which corresponds to the pressure relief valve on the cover plate.

[0006] Beneficial effects: The insulating film is divided into multiple independent surfaces, each with a specific shape, size, and folding direction. These surfaces correspond to different parts of the battery cell, allowing the insulating film to be applied to the outer surface of the cell. Folding and turning the edges completes the application, ensuring a firm bond between the insulating film and the cell casing and cover plate. The folding action also prevents the insulating film from lifting, thus ensuring the external insulation performance of the battery cell. The integrated foldable structure reduces the number of splices in the insulating film, improving wrapping efficiency and insulation reliability. Furthermore, the elimination of the top cover patch reduces the steps involved in top cover application and the connection between the insulating film and the top cover patch, optimizing the assembly process and improving battery cell assembly efficiency. A discontinuous structure on the fourth surface ensures proper venting of the pressure relief valve and reduces the exposed area of ​​the cover plate, further improving the insulation reliability of the battery cell.

[0007] In one optional implementation, the width W of the first flange, the second flange, the third flange, and the fourth flange satisfies 2mm ≤ W ≤ 10mm.

[0008] In one alternative embodiment, along the X direction, the fifth surface extends from the bottom edge of the first surface and is attached to the cover plate surface at the lower end of the housing. Along the Y direction, the first flange extends outward from the side of the first surface, and the second flange extends outward from the side of the third surface. The first flange and the second flange are attached to the second narrow side surface. Along the X direction, the third flange extends outward from the top edge of the fourth surface, and the fourth flange extends outward from the bottom edge of the fifth surface. The third flange and the fourth flange are attached to the second large surface.

[0009] In one alternative embodiment, along the X direction, the fifth surface extends from the bottom edge of the second surface and is attached to the surface of the cover plate at the lower end of the housing. Along the Y direction, the first flange extends outward from the side of the first surface, and the second flange extends outward from the side of the third surface. The first flange and the second flange are attached to the second narrow side surface. Along the X direction, the third flange extends outward from the top edge of the fourth surface and is attached to the second large surface; The fifth surface is also provided with a fifth flange. Along the Y direction, the fourth flange and the fifth flange extend outward from both sides of the fifth surface. The fourth flange is attached to the first large surface, and the fifth flange is attached to the second large surface.

[0010] In one alternative embodiment, along the X direction, the fifth surface extends from the bottom edge of the third surface and is attached to the cover plate surface at the lower end of the housing. Along the Y direction, the first flange extends outward from the side of the first surface, and the second flange extends outward from the side of the third surface. The first flange and the second flange are attached to the second narrow side surface. Along the X direction, the third flange extends outward from the top edge of the fourth surface and is attached to the second large surface; the fourth flange extends outward from the bottom edge of the fifth surface and is attached to the first large surface.

[0011] In one optional embodiment, a first pole post through hole is provided on the fourth surface, and a second pole post through hole is provided on the fifth surface.

[0012] In one optional embodiment, a first polarity marker is provided on the periphery of the first electrode via, and a second polarity marker is provided on the periphery of the second electrode via.

[0013] In one alternative embodiment, the first polarity identifier includes a first polarity identifier hole or a first printed identifier; the second polarity identifier includes a second polarity identifier hole or a second printed identifier.

[0014] In one alternative implementation, the first polarity marker is a positive polarity marker; the second polarity marker is a negative polarity marker.

[0015] Secondly, this utility model also provides a battery pack, comprising: Box; Multiple battery cells are housed within the housing.

[0016] Beneficial effects: The battery pack also includes a housing, which houses multiple battery cells. The housing prevents liquids or other foreign objects from affecting the charging or discharging of the cells. Moreover, placing multiple battery cells inside the battery pack's housing can increase the overall energy density of the battery pack and improve its performance. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the insulating film in a battery cell according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the insulating film in a battery cell according to another embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the insulating film in a battery cell according to another embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present utility model; Figure 5 for Figure 4 A top view of the battery cell shown; Figure 6 for Figure 5 Enlarged view of A in the middle; Figure 7 This is another structural schematic diagram of a battery cell according to an embodiment of the present utility model; Figure 8 for Figure 7 The image shows a top view of the battery cell.

[0019] Explanation of reference numerals in the attached figures: 10. Housing; 100. Insulating film; 110. First side; 111. First flange; 120. Second side; 130. Third side; 131. Second flange; 140. Fourth side; 141. Third flange; 142. First pole post through hole; 143. First polarity marker; 144. Discontinuous structure; 150. Fifth side; 151. Fourth flange; 152. Second pole post through hole; 153. Second polarity marker; 154. Fifth flange; 210. First pole post; 220. Second pole post. Detailed Implementation

[0020] 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, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Taking blade battery cells as an example, combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0022] According to embodiments of the present invention, on the one hand, in conjunction with reference to... Figures 1 to 6A battery cell is provided, comprising: a housing 10 having a first large surface and a second large surface disposed opposite to each other, and a first narrow side surface and a second narrow side surface disposed opposite to each other; a cover plate, mounted on the upper and lower ends of the housing 10 along the X direction; an insulating film 100 including a first surface 110 attached to the first large surface, the first surface 110 having a first flange 111 attached to the second narrow side surface; a second surface 120 extending from the side of the first surface 110 along the Y direction and attached to the first narrow side surface; and a third surface 130 extending from the side of the second surface 120 along the Y direction and attached to the second large surface, the third surface 130 having a second flange 111 attached to the second narrow side surface. Side 131 is attached to the second narrow side; fourth side 140 extends from the top edge of the first side 110 along the X direction and is attached to the cover surface of the upper end of the housing 10, and the fourth side 140 is provided with a third flange 141, which is attached to the second large side; fifth side 150 extends from the bottom edge of one of the first side 110, the second side 120 and the third side 130 along the X direction and is attached to the cover surface of the lower end of the housing 10, and the fifth side 150 is provided with a fourth flange 151, which is attached to the first large side or the second large side; the fourth side 140 is provided with an intermittent structure 144, which corresponds to the pressure relief valve on the cover.

[0023] In this embodiment, the X direction is the height direction of the battery cell, the Y direction is the width direction of the battery cell, and the Z direction is the thickness direction of the battery cell. The housing 10 is the outer shell of the battery cell, having a receiving cavity and an opening, serving to house and protect internal components such as the electrode assembly. Simultaneously, the housing 10 provides mechanical support to prevent damage to the battery cell from external forces. The housing 10 has a first large surface, a second large surface, a first narrow side surface, and a second narrow side surface. The first and second large surfaces are arranged opposite each other, as are the first and second narrow side surfaces. The receiving cavity is formed by the sequential connection and cooperation of the first large surface, the first narrow side surface, the second large surface, and the second narrow side surface. The first and second large surfaces refer to one of the two largest side surfaces of the housing 10; the first and second narrow side surfaces refer to the smaller side surfaces of the housing 10, located on either side of the first and second large surfaces.

[0024] Both ends of the housing 10 have openings communicating with the receiving cavity. The electrode assembly can pass through either opening to be installed in the receiving cavity of the housing 10. The electrode assembly is provided with tabs to conduct current from the electrode assembly. The tabs include positive tabs and negative tabs. Two cover plates are provided, respectively installed at the upper and lower ends of the housing 10, to fix and seal the internal components such as the electrode assembly, enclosing them inside the housing 10 to prevent the entry of external impurities and moisture, while also preventing leakage of internal electrolyte, thus providing a stable working environment for the battery cell.

[0025] The insulating film 100 is divided into 5 independent surfaces, each with a specific shape, size and folding direction, so that the divided surfaces correspond to different parts of the battery cell, such as the large surface, narrow side and cover plate of the housing 10, so that the insulating film 100 is applied to the outer surface of the battery cell to achieve external insulation of the battery cell.

[0026] The insulating film 100 includes a first surface 110, a second surface 120, a third surface 130, a fourth surface 140, and a fifth surface 150. The first surface 110 is rectangular in shape, and its dimensions are adapted to the first large surface of the housing 10. When the insulating film 100 is used to wrap the battery cell, the first surface 110 is attached to the first large surface of the housing 10. A first flange 111 is provided on the side of the first surface 110. The first flange 111 extends from the side of the first surface 110 in a direction away from the first surface 110 and is attached to the second narrow side.

[0027] Along the Y direction, the second surface 120 extends from the side of the first surface 110 in a direction away from the first surface 110. The size of the second surface 120 is adapted to the second narrow side of the housing 10 and can be folded relative to the first surface 110. After the first surface 110 is attached to the first large surface of the housing 10, the second surface 120 is folded so that the second surface 120 is attached to the second narrow side of the housing 10.

[0028] Along the Y direction, the third surface 130 extends from the side of the second surface 120 in a direction away from the second surface 120. The third surface 130 is foldable relative to the second surface 120, and its dimensions are the same as those of the first surface 110. When the second surface 120 is attached to the first narrow side surface, the third surface 130 is folded so that it is attached to the second large surface of the housing 10, thus forming a complete wrap around the first and second large surfaces of the housing 10, thereby attaching the insulating film 100 to the two large surfaces and one of the narrow side surfaces of the housing 10. A second flange 131 is provided on the side of the third surface 130, extending from the side of the third surface 130 in a direction away from the third surface 130, and is attached to the second narrow side surface.

[0029] Along the X direction, the fourth surface 140 extends from the top edge of the first surface 110 in a direction away from the first surface 110, and the fourth surface 140 can be folded relative to the first surface 110. After the first surface 110, the second surface 120, and the third surface 130 are attached to the housing 10, the fourth surface 140 is folded so that the fourth surface 140 is attached to the surface of the cover plate at the upper end of the housing 10 to achieve insulation of the upper cover plate of the housing 10. A third flange 141 is provided on the side of the fourth surface 140, which extends from the top edge of the fourth surface 140 in a direction away from the fourth surface 140 and is attached to the second large surface.

[0030] Along the X direction, the fifth surface 150 can be formed by extending downward from the bottom edge of any one of the first surface 110, the second surface 120, or the third surface 130, and can be folded relative to the extending surface. For example, when the fifth surface 150 extends downward from the bottom edge of the first surface 110, the fifth surface 150 can be folded relative to the first surface 110; when the fifth surface 150 extends downward from the bottom edge of the second surface 120, the fifth surface 150 can be folded relative to the second surface 120; and when the fifth surface 150 extends downward from the bottom edge of the third surface 130, the fifth surface 150 can be folded relative to the third surface 130. The dimensions of the fifth surface 150 are the same as those of the fourth surface 140. After the first surface 110, the second surface 120, and the third surface 130 are attached to the housing 10, the fifth surface 150 is folded so that it is attached to the surface of the cover plate at the lower end of the housing 10, thereby achieving insulation of the lower end cover plate of the housing 10 and forming symmetrical insulation protection. A fourth flange 151 is provided on the side of the fifth surface 150. The fourth flange 151 extends from the bottom edge of the fifth surface 150 in a direction away from the fifth surface 150 and is attached to the first or second large surface.

[0031] The insulating film 100 is applied to the first large surface, the second large surface, the first narrow side surface, the second narrow side surface, the cover surface at the upper end of the housing 10, and the cover surface at the lower end of the housing 10. The first flange 111 and the second flange 131 are then applied to the second narrow side surface, so that the first flange 111 and the second flange 131 can wrap around the edge at the connection between the second narrow side surface and the first and second large surfaces. The third flange 141 is applied to the first large surface, and the fourth flange 151 is applied to either the first or second large surface, so that the third flange 141 and the fourth flange 151 can wrap around the edge at the connection between the cover and the housing 10. This completes the overall application of the insulating film 100, allowing it to wrap around the outer surface of the battery cell, thus achieving external insulation of the battery cell. The integrated design reduces the splicing of the insulating film 100, improving the wrapping efficiency and insulation reliability of the insulating film 100; moreover, it eliminates the need for a top cover patch, reducing the steps of applying the top cover patch and the connection steps between the insulating film 100 and the top cover patch, thus optimizing the assembly process and improving the efficiency of cell assembly.

[0032] The cover plate is equipped with terminals for connecting to external circuits to enable the charging and discharging of the battery cell. Additionally, the cover plate includes safety components such as explosion-proof plates and pressure relief valves. When the internal pressure of the battery cell is too high, the pressure relief valve automatically releases pressure to prevent the battery cell from exploding, ensuring safe use. Therefore, an intermittent structure 144 is provided on the fourth surface 140, so that the insulating film 100 wraps around the pressure relief valve, but does not completely cover the pressure relief valve patch. When the pressure relief valve releases gas, the pressure relief valve patch applies pressure to the intermittent structure 144, causing the intermittent structure 144 to break, thereby ensuring normal gas release of the pressure relief valve and preventing the insulating film 100 from completely covering the pressure relief valve and affecting its normal operation. By using the intermittent structure 144 instead of a perforated structure at the position of the insulating film 100 corresponding to the pressure relief valve, the exposed area of ​​the cover plate can be reduced, thereby improving the insulation reliability of the battery cell.

[0033] In one embodiment, the width W of the first flange 111, the second flange 131, the third flange 141 and the fourth flange 151 satisfies 2mm≤W≤10mm.

[0034] In this embodiment, the width W can specifically be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc. The widths of the first flange 111, the second flange 131, the third flange 141, and the fourth flange 151 can be the same or different, and can be set according to actual usage requirements without specific limitations. After the insulating film 100 is attached to the housing 10 and the cover plate, the first flange 111 and the second flange 131 are folded to wrap around the edge at the connection between the second narrow side of the housing 10 and the first large surface and the second large surface, and the third flange 141 and the fourth flange 151 are folded to wrap around the edge at the connection between the housing 10 and the cover plate, to prevent the edge from contacting the external structure and causing a short circuit. If W is too small, such as less than 2mm, the edge may curl up during cell use, exposing the edges at the junction of the narrow side and the large side, or the junction of the housing 10 and the cover plate. This could cause the edges to come into contact with the external structure, leading to a short circuit and affecting the normal use of the cell. If W is too large, such as greater than 10mm, it will increase material costs, and excessive overlap between the folded edge and the insulating film 100 may increase the overall thickness of the cell, affecting the space utilization of the cell module. By reasonably setting the width of the folded edge, the insulating film 100 can be properly wrapped around the surface of the housing 10 and the cover plate, thereby ensuring the insulation reliability of the cell.

[0035] like Figure 1As shown, in one embodiment, along the X direction, the fifth surface 150 extends from the bottom edge of the first surface 110 and is attached to the cover surface at the lower end of the housing 10; along the Y direction, the first flange 111 extends outward from the side edge of the first surface 110, and the second flange 131 extends outward from the side edge of the third surface 130, with the first flange 111 and the second flange 131 being attached to the second narrow side surface; along the X direction, the third flange 141 extends outward from the top edge of the fourth surface 140, and the fourth flange 151 extends outward from the bottom edge of the fifth surface 150, with the third flange 141 and the fourth flange 151 being attached to the second large surface.

[0036] In this embodiment, along the X direction, the fifth surface 150 extends from the bottom edge of the first surface 110 in a direction away from the first surface 110, and the fifth surface 150 is foldable relative to the first surface 110. The fifth surface 150 is attached to the cover surface at the lower end of the housing 10. Along the Y direction, the first flange 111 extends from the side edge of the first surface 110 in a direction away from the first surface 110, and the second flange 131 extends from the side edge of the third surface 130 in a direction away from the third surface 130. Along the X direction, the third flange 141 extends from the top edge of the fourth surface 140 in a direction away from the fourth surface 140, and the fourth flange 151 extends from the bottom edge of the fifth surface 150 in a direction away from the fifth surface 150.

[0037] When it is necessary to attach the insulating film 100 to the outer surface of the battery cell, the first side 110 is attached to the first large surface of the housing 10, the second side 120 is folded so that the second side 120 is attached to the first narrow side of the housing 10; then the third side 130 is folded so that the third side 130 is attached to the second large surface of the housing 10, and the first flange 111 and the second flange 131 are further folded so that the first flange 111 and the second flange 131 are attached to the second narrow side of the housing 10 respectively, so that the insulating film 100 is wrapped around the outer surface of the housing 10, and the first flange 111 and the second flange 131 can wrap around the edge at the junction of the narrow side and the large surface. Then fold the fourth side 140 and the fifth side 150 so that the fourth side 140 and the fifth side 150 are respectively attached to the cover surfaces at the upper and lower ends of the cell along the X direction; then fold the third flange 141 and the fourth flange 151 and attach the third flange 141 and the fourth flange 151 to the second large surface of the housing 10 so that the third flange 141 and the fourth flange 151 wrap around the edge of the connection between the housing 10 and the cover plate, thereby completing the overall application of the insulating film 100, so that the insulating film 100 can wrap around the outer surface of the cell to achieve external insulation of the cell.

[0038] like Figure 2As shown, in one embodiment, along the X direction, the fifth surface 150 extends from the bottom edge of the second surface 120 and is attached to the cover surface at the lower end of the housing 10; along the Y direction, the first flange 111 extends outward from the side edge of the first surface 110, and the second flange 131 extends outward from the side edge of the third surface 130, with the first flange 111 and the second flange 131 being attached to the second narrow side surface respectively; along the X direction, the third flange 141 extends outward from the top edge of the fourth surface 140 and is attached to the second large surface; the fifth surface 150 is also provided with a fifth flange 154, and along the Y direction, the fourth flange 151 and the fifth flange 154 extend outward from both sides of the fifth surface 150, with the fourth flange 151 being attached to the first large surface and the fifth flange 154 being attached to the second large surface.

[0039] In this embodiment, along the X direction, the fifth surface 150 extends from the bottom edge of the second surface 120 in a direction away from the second surface 120, and the fifth surface 150 is foldable relative to the second surface 120. The fifth surface 150 is attached to the cover surface at the lower end of the housing 10. Along the Y direction, the first flange 111 extends from the side edge of the first surface 110 in a direction away from the first surface 110, and the second flange 131 extends from the side edge of the third surface 130 in a direction away from the third surface 130. Along the X direction, the third flange 141 extends from the top edge of the fourth surface 140 in a direction away from the fourth surface 140. Along the Y direction, the fourth flange 151 and the fifth flange 154 extend from both sides of the fifth surface 150 in a direction away from the fifth surface 150.

[0040] When it is necessary to attach the insulating film 100 to the outer surface of the battery cell, the first side 110 is attached to one of the large surfaces of the housing 10, the second side 120 is folded so that the second side 120 is attached to the narrow side of the housing 10; then the third side 130 is folded so that the third side 130 is attached to another large surface of the housing 10, and the first flange 111 and the second flange 131 are further folded so that the first flange 111 and the second flange 131 are attached to the second narrow side of the housing 10, so that the insulating film 100 is wrapped around the outer surface of the housing 10, and the first flange 111 and the second flange 131 can wrap around the edge at the junction of the narrow side and the large surface. Then fold the fourth side 140 and the fifth side 150 so that the fourth side 140 and the fifth side 150 are respectively attached to the cover surfaces at the upper and lower ends of the cell along the X direction; then fold the third flange 141, the fourth flange 151 and the fifth flange 154, attach the third flange 141 to the second large surface of the housing 10, and attach the fourth flange 151 and the fifth flange 154 to the first large surface and the second large surface of the housing 10 so that the third flange 141, the fourth flange 151 and the fifth flange 154 wrap around the edge of the connection between the housing 10 and the cover plate, thereby completing the overall application of the insulating film 100, so that the insulating film 100 can wrap around the outer surface of the cell to achieve external insulation of the cell.

[0041] like Figure 3 As shown, in one embodiment, along the X direction, the fifth surface 150 extends from the bottom edge of the third surface 130 and is attached to the cover surface at the lower end of the housing 10; along the Y direction, the first flange 111 extends outward from the side edge of the first surface 110, and the second flange 131 extends outward from the side edge of the third surface 130, with the first flange 111 and the second flange 131 being attached to the second narrow side surface respectively; along the X direction, the third flange 141 extends outward from the top edge of the fourth surface 140 and is attached to the second large surface; the fourth flange 151 extends outward from the bottom edge of the fifth surface 150 and is attached to the first large surface.

[0042] In this embodiment, along the X direction, the fifth surface 150 extends from the bottom edge of the third surface 130 in a direction away from the third surface 130, and the fifth surface 150 is foldable relative to the third surface 130. The fifth surface 150 is attached to the cover surface at the lower end of the housing 10. Along the Y direction, the first flange 111 extends from the side edge of the first surface 110 in a direction away from the first surface 110, and the second flange 131 extends from the side edge of the third surface 130 in a direction away from the third surface 130. Along the X direction, the third flange 141 extends from the top edge of the fourth surface 140 in a direction away from the fourth surface 140, and the fourth flange 151 extends from the bottom edge of the fifth surface 150 in a direction away from the fifth surface 150.

[0043] When it is necessary to attach the insulating film 100 to the outer surface of the battery cell, the first side 110 is attached to one of the large surfaces of the housing 10, the second side 120 is folded so that the second side 120 is attached to the narrow side of the housing 10; then the third side 130 is folded so that the third side 130 is attached to another large surface of the housing 10, and the first flange 111 and the second flange 131 are further folded so that the first flange 111 and the second flange 131 are attached to another narrow side of the housing 10, so that the insulating film 100 is wrapped around the outer surface of the housing 10, and the first flange 111 and the second flange 131 can wrap around the edge at the junction of the narrow side and the large surface. Then fold the fourth side 140 and the fifth side 150 so that the fourth side 140 and the fifth side 150 are respectively attached to the cover plates at the upper and lower ends of the cell along the X direction; then fold the third flange 141 and the fourth flange 151, attach the third flange 141 to the second large surface of the housing 10, and attach the fourth flange 151 to the first large surface of the housing 10 so that the third flange 141 and the fourth flange 151 wrap around the edge of the connection between the housing 10 and the cover plate, thereby completing the overall application of the insulating film 100, so that the insulating film 100 can wrap around the outer surface of the cell to achieve external insulation of the cell.

[0044] like Figures 4 to 8 As shown, in one embodiment, a first pole post through hole 142 is provided on the fourth surface 140, and a second pole post through hole 152 is provided on the fifth surface 150.

[0045] In this embodiment, cover plates are connected to both ends of the housing 10 along the X direction. A first pole post 210 is provided on the top cover plate, and a second pole post 220 is provided on the bottom cover plate. Therefore, when the insulating film 100 is applied to the cover plate, a through hole for the pole post to pass through needs to be reserved. A first pole post through hole 142 is provided on the fourth surface 140, and a second pole post through hole 152 is provided on the fifth surface 150. When the fourth surface 140 and the fifth surface 150 need to be applied to the cover plate respectively, the fourth surface 140 and the fifth surface 150 are folded so that the first pole post 210 passes through the first pole post through hole 142 and the second pole post 220 passes through the second pole post through hole 152, thereby applying the fourth surface 140 and the fifth surface 150 to the cover plate. Then, the flange is folded so that the flange is applied to the large surface of the housing 10 to complete the application of the insulating film 100. By setting the first terminal through hole 142 and the second terminal through hole 152, the insulating film 100 can be smoothly attached to the outer surface of the housing 10 and the cover plate to achieve external insulation of the battery cell.

[0046] In one embodiment, a first polarity identifier 143 is provided on the periphery of the first electrode via 142, and a second polarity identifier 153 is provided on the periphery of the second electrode via 152. Further, the first polarity identifier 143 includes a first polarity identifier hole or a first printed identifier; the second polarity identifier 153 includes a second polarity identifier hole or a second printed identifier.

[0047] In this embodiment, to ensure the insulating film 100 is correctly attached to the outer surface of the battery cell, a first polarity marker 143 is provided around the first terminal through-hole 142, and a second polarity marker 153 is provided around the second terminal through-hole 152 to distinguish the polarity of the first terminal 210 and the second terminal 220, ensuring that the insulating film 100 can be correctly wrapped around the outer surface of the battery cell. The first polarity marker 143 is a positive polarity marker, and the second polarity marker 153 is a negative polarity marker; or the first polarity marker 143 is a negative polarity marker, and the second polarity marker 153 is a positive polarity marker.

[0048] Furthermore, the first polarity marker 143 can be configured as a first polarity marker hole or a first printed marker. Similarly, the second polarity marker 153 can be configured as a second polarity marker hole or a second printed marker. For example, the first polarity marker 143 can be a first polarity marker hole, and the second polarity marker 153 can be a second polarity marker hole; or the first polarity marker 143 can be a first printed marker, and the second polarity marker 153 can be a second printed marker; or the first polarity marker 143 can be a first polarity marker hole, and the second polarity marker 153 can be a second printed marker; or the first polarity marker 143 can be a first printed marker, and the second polarity marker 153 can be a second polarity marker hole. The specific type of the first polarity marker 143 and the second polarity marker 153 can be selected according to actual usage requirements. If the polarity marker is a polarity marker hole, it can be set simultaneously using the mold when setting the electrode through-hole. If the polarity marking is a printed marking, it can be set by printing ink or by attaching a patch. The first polarity marking 143 is the positive polarity marking; the second polarity marking 153 is the negative polarity marking.

[0049] In some implementations, the battery cell can be a rechargeable cell, which refers to a cell that can be reactivated by charging after discharge and continue to be used. The battery cell can be a lithium-ion cell, sodium-ion cell, sodium-lithium-ion cell, lithium-sulfur cell, magnesium-ion cell, nickel-metal hydride cell, nickel-cadmium cell, lead-acid cell, etc., and this utility model embodiment is not limited to this.

[0050] In some implementations, the battery cell in this utility model embodiment can be a metal battery cell. Specifically, the metal battery cell may include a lithium metal secondary battery cell, a sodium metal battery cell, or a magnesium metal battery cell, etc. This utility model embodiment does not limit this.

[0051] The electrode assembly of a battery cell includes a positive electrode, a negative electrode, and an insulating component. During the charging and discharging process, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The insulating component, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0052] In some implementations, the positive electrode can be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0053] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0054] In some implementations, the negative electrode can be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0055] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0056] In some implementations, the separator is a separator membrane. This invention does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0057] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0058] In some implementations, the separator is a solid electrolyte. The solid electrolyte is placed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0059] In some implementations, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This invention does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0060] According to an embodiment of this utility model, a battery pack is also provided, comprising: a housing; and multiple battery cells housed within the housing. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells; furthermore, placing multiple battery cells within the housing increases the overall energy density of the battery pack and improves its performance.

[0061] The battery pack mentioned in the embodiments of this utility model may include a single physical module of one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed through a busbar. Multiple battery cells can be directly assembled into a battery pack, or they can be first assembled into battery cell modules, and then the battery cell modules are assembled into a battery pack.

[0062] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0063] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, include: The housing has a first large surface and a second large surface disposed opposite to each other, and a first narrow side surface and a second narrow side surface disposed opposite to each other. A cover plate is installed at the upper and lower ends of the housing along the X direction; An insulating film includes a first side attached to a first large surface, the first side having a first flange attached to a second narrow side surface; a second side extending from the side of the first surface along the Y direction and attached to the first narrow side surface; a third side extending from the side of the second surface along the Y direction and attached to the second large surface, the third side having a second flange attached to the second narrow side surface; a fourth side extending from the top edge of the first surface along the X direction and attached to the cover surface of the upper end of the housing, the fourth side having a third flange attached to the second large surface; and a fifth side extending from the bottom edge of one of the first, second, and third sides along the X direction and attached to the cover surface of the lower end of the housing, the fifth side having a fourth flange attached to either the first large surface or the second large surface. The fourth surface is provided with an intermittent structure, which corresponds to the pressure relief valve on the cover plate.

2. The battery cell according to claim 1, characterized in that, The width W of the first flange, the second flange, the third flange, and the fourth flange satisfies 2mm≤W≤10mm.

3. The battery cell according to claim 1, characterized in that, Along the X direction, the fifth surface extends from the bottom edge of the first surface and is attached to the cover plate surface at the lower end of the housing; Along the Y direction, the first flange extends outward from the side of the first surface, and the second flange extends outward from the side of the third surface. The first flange and the second flange are attached to the second narrow side surface. Along the X direction, the third flange extends outward from the top edge of the fourth surface, and the fourth flange extends outward from the bottom edge of the fifth surface. The third flange and the fourth flange are attached to the second large surface.

4. The battery cell according to claim 1, characterized in that, Along the X direction, the fifth surface extends from the bottom edge of the second surface and is attached to the surface of the cover plate at the lower end of the housing; Along the Y direction, the first flange extends outward from the side of the first surface, and the second flange extends outward from the side of the third surface. The first flange and the second flange are attached to the second narrow side surface. Along the X direction, the third flange extends outward from the top edge of the fourth surface and is attached to the second large surface; The fifth surface is also provided with a fifth flange. Along the Y direction, the fourth flange and the fifth flange extend outward from both sides of the fifth surface. The fourth flange is attached to the first large surface, and the fifth flange is attached to the second large surface.

5. The battery cell according to claim 1, characterized in that, Along the X direction, the fifth surface extends from the bottom edge of the third surface and is attached to the surface of the cover plate at the lower end of the housing; Along the Y direction, the first flange extends outward from the side of the first surface, and the second flange extends outward from the side of the third surface. The first flange and the second flange are attached to the second narrow side surface. Along the X direction, the third flange extends outward from the top edge of the fourth surface and is attached to the second large surface; the fourth flange extends outward from the bottom edge of the fifth surface and is attached to the first large surface.

6. The battery cell according to claim 1, characterized in that, The fourth surface is provided with a first pole post through hole, and the fifth surface is provided with a second pole post through hole.

7. The battery cell according to claim 6, characterized in that, The first electrode through hole is provided with a first polarity marker on its periphery, and the second electrode through hole is provided with a second polarity marker on its periphery.

8. The battery cell according to claim 7, characterized in that, The first polarity identifier includes a first polarity identifier hole or a first printed identifier; the second polarity identifier includes a second polarity identifier hole or a second printed identifier.

9. The battery cell according to claim 7, characterized in that, The first polarity marker is a positive polarity marker; the second polarity marker is a negative polarity marker.

10. A battery pack, characterized in that, include: Box; The battery cells according to any one of claims 1-9, wherein the plurality of said battery cells are housed in said housing.

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