Battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery, which comprises a battery cell, the insulating film covers the outer surface of the battery cell, the insulating film is provided with a first edge part and a second edge part, orthographic projections of the first edge part and the second edge part on the first surface of the battery cell are at least partially overlapped, the first edge part is provided with a first hole body, the second edge part is provided with a second hole body, and the projections of the first hole body and the second hole body on the first surface are arranged in a staggered manner; the center distance between the projection of the first hole body on the first surface and the projection of the second hole body on the first surface is a, and a is larger than or equal to 5mm and smaller than or equal to 35mm. According to the utility model, the first hole body and the second hole body are staggered at the overlapped part, so that the insulation vacancy of the first hole body and the second hole body is made up, and the insulation effect of the battery cell is ensured; the distance between the first hole body and the second hole body is controlled, so that the positioning effect of the first hole body and the second hole body and the infiltration effect of the battery cell are ensured, and the situation that the first hole body and the second hole body coincide to affect the insulation effect is avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to batteries. Background Technology

[0002] In the manufacturing process of square lithium-ion batteries, a Mylar film is typically wrapped around the bare cell before it is installed in the casing. Wrapping the bare cell with a Mylar film prevents scratches on the casing during installation and provides insulation between the bare cell and the metal casing, preventing safety accidents. Usually, positioning holes are provided in the Mylar film to facilitate assembly and ensure the precise fit between the Mylar film and the bare cell. However, after the Mylar film is wrapped around the bare cell, the positioning holes can sometimes expose the bare cell, affecting its insulation performance. Utility Model Content

[0003] In view of this, the present invention provides a battery to solve the problem in the prior art where the opening of the positioning hole easily leads to the exposure of the bare battery cell, which affects the insulation effect of the battery cell.

[0004] This utility model provides a battery, comprising: a casing, including a cover and a casing body, the casing body having an opening, the cover being disposed in the opening and fixedly connected to the casing body; a battery cell disposed within the casing; and an insulating film covering the outer surface of the battery cell, the insulating film having a first side and a second side, the orthographic projections of the first side and the second side onto a first surface of the battery cell at least partially overlapping, the first side having a first hole, the second side having a second hole, the projections of the first hole and the second hole onto the first surface being staggered, and the center distance between the projections of the first hole onto the first surface and the projections of the second hole onto the first surface being a, satisfying 5mm≤a≤35mm.

[0005] Beneficial effects: By opening the first hole and the second hole respectively on the first and second sides, the position of the insulating film when covering the battery cell can be accurately guaranteed, and misalignment is less likely to occur, thereby improving production efficiency and insulation effect. Furthermore, by making the first and second sides overlap, and the first hole and the second hole are misaligned at the overlap, the insulation gap between the first hole and the second hole is filled, further ensuring the insulation effect of the battery cell and improving the safety performance of the battery. In addition, by controlling the distance between the first hole and the second hole, the positioning effect of the first hole and the second hole and the wetting effect of the battery cell are guaranteed, while avoiding overlap between the first hole and the second hole, which would affect the insulation effect. Attached Figure Description

[0006] 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.

[0007] Figure 1 This is a schematic diagram of the structure of the insulating film in the unfolded state according to an embodiment of the present invention;

[0008] Figure 2 for Figure 1 The front view of the insulating film shown;

[0009] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0010] Figure 4 for Figure 2 A magnified view of part B in the diagram;

[0011] Figure 5 This is a schematic diagram of the structure of the insulating film in the covered state according to an embodiment of the present invention;

[0012] Figure 6 for Figure 5 A perspective view of the insulating film shown;

[0013] Figure 7 for Figure 6 The front view of the insulating film shown;

[0014] Figure 8 for Figure 7 A magnified view of part of C;

[0015] Figure 9 for Figure 1 The diagram shows the fit between the insulating film and the battery cell.

[0016] Figure 10 for Figure 9 The front view of the insulating film and battery cell is shown.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Battery cell; 11. First surface; 2. Insulating film; 21. First side; 211. First hole; 22. Second side; 221. Second hole. Detailed Implementation

[0019] 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.

[0020] The following is combined Figures 1 to 10 The following describes embodiments of the present invention.

[0021] According to an embodiment of the present invention, a battery is provided, comprising: a casing, a battery cell 1, and an insulating film 2. The casing includes a cover and a casing body, the casing body having an opening, and the cover being disposed at the opening and fixedly connected to the casing body. The battery cell 1 is disposed within the casing, and the insulating film 2 covers the outer surface of the battery cell 1. The insulating film 2 has a first side 21 and a second side 22, the orthographic projections of the first side 21 and the second side 22 on the first surface 11 of the battery cell at least partially overlap. The first side 21 has a first hole 211, and the second side 22 has a second hole 221, the projections of the first hole 211 and the second hole 221 on the first surface 11 being misaligned. Figure 8 As shown, the center distance between the projection of the first hole 211 onto the first surface 11 and the projection of the second hole 221 onto the first surface 11 is a, which satisfies 5mm≤a≤35mm.

[0022] By opening a first hole 211 and a second hole 221 on the first side 21 and the second side 22 respectively, the position of the insulating film 2 when covering the battery cell 1 can be accurately guaranteed, and misalignment is less likely to occur, thereby improving production efficiency and insulation effect. Furthermore, by making the first side 21 and the second side 22 overlap, and the first hole 211 and the second hole 221 are misaligned at the overlap, the insulation gaps of the first hole 211 and the second hole 221 are filled, further ensuring the insulation effect of the battery cell 1 and improving the safety performance of the battery. In addition, by controlling the distance between the first hole 211 and the second hole 221, the positioning effect of the first hole 211 and the second hole 221 and the wetting effect of the battery cell 1 are guaranteed, while avoiding overlap of the first hole 211 and the second hole 221, which would affect the insulation effect.

[0023] It is worth noting that during the process of covering the outer surface of the battery cell 1 with the insulating film 2, the insulating film 2 is folded from one surface adjacent to the first surface 11 to form a first edge 21, and the insulating film 2 is folded from another surface adjacent to the first surface 11 to form a second edge 22. This ensures that the first edge 21 and the second edge 22 at least partially overlap, and both the first hole 211 and the second hole 221 are located in the overlapping area. In other words, the first edge 21 and the second edge 22 refer to the area located at the edge of the insulating film 2. The aforementioned "misaligned arrangement" means that the projections of the first hole 211 and the second hole 221 on the first surface 11 do not coincide; that is, the first hole 211 and the second hole 221 are not connected. Therefore, the first hole 211 is covered by the second edge 22, and the second hole 221 is covered by the first edge 21, ensuring the insulation effect of the battery cell 1.

[0024] It can be understood that "the center distance between the projections of the first hole 211 onto the first surface 11 and the projections of the second hole 221 onto the first surface 11" is the distance between the center of the projection of the first hole 211 onto the first surface 11 and the center of the projection of the second hole 221 onto the first surface 11. Furthermore, the "center" mentioned above refers to the geometric center of the projection. For example, please refer to... Figure 8 In this embodiment, both the first hole 211 and the second hole 221 are circular holes. That is, the projection of the first hole 211 onto the first surface 11 is circular, and the projection of the second hole 221 onto the first surface 11 is also circular. Therefore, the "center distance" is the distance between the centers of the two projections. Of course, in other alternative embodiments, the first hole 211 and / or the second hole 221 can also be other shapes, such as square, polygonal, elliptical, etc., and the center of their projection onto the first surface 11 can be determined according to their shape.

[0025] It should be noted that if a < 5mm, the distance between the first hole 211 and the second hole 221 is too close, and there is a risk of overlap between the first hole 211 and the second hole 221, which may affect the insulation effect of the battery cell 1; if a > 35mm, the distance between the first hole 211 and the second hole 221 is too far, and the first hole 211 and the second hole 221 are widely distributed on the insulating film 2, which may affect the positioning accuracy of the insulating film 2, and thus affect the stacking positioning accuracy of the insulating film 2 itself during manufacturing and the positioning accuracy when covering the battery cell 1.

[0026] It is worth noting that the insulating film 2 is typically a Mylar film, while the electrolyte cannot permeate through the Mylar to enter the battery cell 1. Therefore, by creating a first pore 211 and a second pore 221 on the insulating film 2, the electrolyte can enter the battery cell 1 through the first pore 211 and the second pore 221, thus achieving wetting of the battery cell 1. Furthermore, the insulating film 2 is typically made of insulating materials such as PET polyester film, PI, or PBS.

[0027] It should be further explained that if the value of 'a' is too large (i.e., the distance between the first pore 211 and the second pore 221 is too great), the path for the electrolyte between the casing and the cell 1 to wet the cell 1 via the first pore 211 and the second pore 221 will be too long, affecting the wetting effect and efficiency of the cell 1. Therefore, by controlling the distance between the first pore 211 and the second pore 221, the electrolyte can be transported through the first pore 211 and the second pore 221, allowing the cell 1 to be fully wetted by the electrolyte and improving the cycle life of the battery charge and discharge.

[0028] Optionally, the value of 'a' can be any value among 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, and 35mm, as well as any value between any two values.

[0029] It is worth noting that the cover and the shell body can be fixedly connected by welding, riveting, or bonding. Laser welding is commonly used in these technologies. Furthermore, the shell body and cover are generally made of metal, such as aluminum, aluminum alloy, copper, copper alloy, nickel, steel, titanium alloy, or magnesium alloy. Understandably, the insulating film 2 is placed between the shell and the battery cell 1 to provide insulation.

[0030] In one embodiment, such as Figure 8 As shown, the shortest distance between the edge of the projection of the first hole 211 onto the first surface 11 and the edge of the projection of the second hole 221 onto the first surface 11 is g, satisfying 1mm≤g≤20mm. This configuration ensures the insulation effect of the insulating film 2 between the battery cell 1 and the housing, while also guaranteeing the positioning effect of the first hole 211 and the second hole 221, as well as the wetting effect of the battery cell 1.

[0031] It is worth noting that if g < 1 mm, the distance between the first hole 211 and the second hole 221 is too close, and metal shavings can easily overlap the cell 1 and the shell through the first hole 211 and the second hole 221, causing a short circuit between the cell 1 and the shell and affecting the safety performance of the battery. If g > 20 mm, the distance between the first hole 211 and the second hole 221 is too far, and the distribution range of the first hole 211 and the second hole 221 on the insulating film 2 is too wide, which can easily affect the positioning accuracy of the insulating film 2, thereby affecting the stacking positioning accuracy of the insulating film 2 itself during manufacturing and the positioning accuracy when covering the cell 1. Furthermore, the path for the electrolyte between the shell and the cell 1 to wet the cell 1 through the first hole 211 and the second hole 221 is too long, affecting the wetting effect and wetting efficiency of the cell 1.

[0032] It is understood that in this embodiment, the diameter of the first hole 211 is d1 and the diameter of the second hole 221 is d2, satisfying g = a - d1 / 2 - d2 / 2.

[0033] Optionally, the value of g can be any value among 1mm, 3mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, and 20mm, as well as any value between any two values.

[0034] In one embodiment, such as Figure 1 and Figure 6 As shown, the first side 21 and the second side 22 are respectively disposed on opposite sides of the insulating film 2. The insulating film 2 is disposed around the four peripheral surfaces of the battery cell 1, and one of the four peripheral surfaces is used as the first surface 11. The insulating film 2 covers the four peripheral surfaces of the battery cell 1, and the first and last sides of the insulating film 2 overlap on one of the four peripheral surfaces, which facilitates the coating process and improves the efficiency of the coating process.

[0035] In one embodiment, such as Figure 9 and Figure 10 As shown, the outer surface of the battery cell 1 also includes two end faces, which are arranged at intervals relative to each other. Each end face is connected to four peripheral faces, and electrodes are led out from the two end faces respectively. The electrodes are led out from the two end faces, and the remaining four peripheral faces are covered with insulating film 2. The covering process is not hindered by the electrodes or other structures, which makes the covering process easier and further improves the efficiency of the covering process.

[0036] It is worth noting that, please refer to Figure 9 After removing the electrodes (e.g., tabs), the battery cell 1 is basically a cuboid structure. The six sides of the cuboid structure are the four peripheral surfaces and two end surfaces mentioned above.

[0037] In one embodiment, such as Figure 5 and Figure 9 As shown, the first surface 11 is a surface formed by the length direction and thickness direction of the battery cell 1.

[0038] It is worth noting that among the four peripheral surfaces covered by the insulating film 2, two of them are surfaces formed by the length and width directions of the battery cell 1, i.e., the large surfaces of the battery cell 1; the other two peripheral surfaces are surfaces formed by the length and thickness directions of the battery cell 1, i.e., the small surfaces of the battery cell 1. The first surface 11 is a small surface of the battery cell 1, i.e., the first side 21 and the second side 22 overlap on a small surface of the battery cell 1.

[0039] It should be further explained that the two end faces are the surfaces formed by the width and thickness directions of cell 1.

[0040] In one embodiment, such as Figures 1 to 7 As shown, along the length of the battery cell 1, a plurality of first holes 211 are spaced apart on the first side 21, and correspondingly, a plurality of second holes 221 are spaced apart on the second side 22. The plurality of first holes 211 and the plurality of second holes 221 are arranged in a corresponding manner. Specifically, in this embodiment, two of each type of hole are provided. The two first holes 211 are positioned close to opposite ends of the first side 21 along the length of the battery cell 1, and the two second holes 221 are positioned close to opposite ends of the second side 22 along the length of the battery cell 1.

[0041] In one embodiment, such as Figure 6 and Figure 7 As shown, the first side 21 is located on the side of the second side 22 away from the first surface 11, and the diameter of the second hole 221 is d2, satisfying 1mm≤d2≤6mm. This configuration ensures the insulation effect of the battery cell 1 while improving the wetting efficiency of the battery cell 1.

[0042] Furthermore, in this embodiment, the second side portion 22 is fitted to the first surface 11.

[0043] It is worth noting that if d2 < 1 mm, the diameter of the second hole 221 is too small, that is, the opening range of the second hole 221 is too small, which makes it difficult for the electrolyte to pass through the second hole 221 and affects the wetting efficiency of the battery cell 1; if d2 > 6 mm, the diameter of the second hole 221 is too large, that is, the opening range of the second hole 221 is too large, and the battery cell 1 is easily exposed, which poses a risk of battery cell 1 overlapping with the shell, and the insulation effect of battery cell 1 is not easy to guarantee.

[0044] Optionally, the value of d2 can be any value among 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, and 6mm, as well as any value between any two values.

[0045] In one embodiment, such as Figure 6 and Figure 7 As shown, the first hole 211 is positioned near the center of the first surface 11 along its length relative to the second hole 221. This arrangement allows the electrolyte located in the middle of the housing to be guided to the edge of the battery cell 1 via the first hole 211 and the second hole 221, thereby improving the wetting effect of the electrolyte on the battery cell 1 while ensuring its insulation performance.

[0046] It is worth noting that, please refer to Figure 7 Along the length direction of the battery cell 1, in the first hole 211 and the second hole 221 near the upper end of the first surface 11, the first hole 211 is located below the second hole 221; along the length direction of the battery cell 1, in the first hole 211 and the second hole 221 near the lower end of the first surface 11, the first hole 211 is located above the second hole 221.

[0047] It should be noted that you should refer to [link / reference]. Figure 8 Along the length of the battery cell 1, the center of the first hole 211 and the center of the second hole 221 are not on the same straight line. Of course, the center of the first hole 211 and the center of the second hole 221 can also be on a straight line along the length of the battery cell 1.

[0048] In one embodiment, such as Figure 8 As shown, along the thickness direction of the battery cell 1, the width of the overlap between the first side 21 and the second side 22 is b, and the thickness of the battery cell 1 is c, satisfying 0.85≤b / c≤0.98. This configuration ensures the insulation effect of the battery cell 1 while avoiding waste of the insulating film 2 and increased costs.

[0049] It is worth noting that if b / c < 0.85, the overlap width of the first side 21 and the second side 22 is too small, which is not convenient for setting the first hole 211 and the second hole 221, and it is easy to expose the surface of the battery cell 1, making it difficult to guarantee the insulation effect of the battery cell 1; if b / c > 0.98, the overlap width of the first side 21 and the second side 22 is too large, requiring more insulating film 2 to be consumed, which increases the production cost.

[0050] Optionally, b / c can be any value from 0.85, 0.88, 0.90, 0.93, 0.95, 0.98, or any value between any two values.

[0051] In one embodiment, the width b at the overlap of the first side 21 and the second side 22 satisfies 17mm≤b≤79mm; the thickness c of the battery cell 1 satisfies 20mm≤c≤80mm.

[0052] Optionally, the value of b can be any value among 17mm, 20mm, 25mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, and 79mm, as well as any value between any two values.

[0053] Optionally, the value of c can be any value among 20mm, 25mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, and 80mm, as well as any value between any two values.

[0054] In one embodiment, such as Figure 3 and Figure 8 As shown, along the length of the battery cell 1, the distance between the center of the first hole 211 and the edge of the first side 21 is e1, which satisfies 25mm≤e1≤75mm. This setting can both prevent damage to the insulating film 2 and ensure the positioning effect of the first hole 211.

[0055] It is worth noting that if e1 < 25mm, the first hole 211 is too close to the edge of the first side 21, making it difficult to open the first hole 211. After the first hole 211 is opened, the remaining part of the edge of the first side 21 is too small, which can easily lead to damage to the insulating film 2. If e1 > 75mm, the first hole 211 is too far from the edge of the first side 21, making it difficult to use the first hole 211 to position the insulating film 2, which affects the positioning accuracy of the insulating film 2.

[0056] Optionally, the value of e1 can be any value among 25mm, 28mm, 30mm, 35mm, 38mm, 40mm, 45mm, 48mm, 50mm, 55mm, 58mm, 60mm, 65mm, 68mm, 70mm, 72mm, and 75mm, as well as any value between any two values.

[0057] In one embodiment, such as Figure 3 and Figure 8 As shown, along the thickness direction of the battery cell 1, the distance between the center of the first hole 211 and the edge of the first side 21 is e2, and the thickness of the battery cell 1 is c, satisfying 1 / 3≤e2 / c≤1 / 2. This arrangement can both prevent damage to the insulating film 2 and ensure the insulation effect of the battery cell 1.

[0058] It is worth noting that if e2 / c < 1 / 3, the first hole 211 is too close to the edge of the first side 21, making it difficult to open the first hole 211. After the first hole 211 is opened, the remaining part of the edge of the first side 21 is too small, which can easily lead to damage to the insulating film 2. If e2 / c > 1 / 2, the first hole 211 is too far from the edge of the first side 21. The first hole 211 is likely to exceed the overlap of the first side 21 and the second side 22, and the insulation effect of the battery cell 1 is not easy to guarantee.

[0059] Optionally, the value of e2 / c can be any value among 1 / 3, 035, 0.38, 0.40, 0.42, 0.45, 0.48, and 0.50, as well as any value between any two values.

[0060] In one embodiment, such as Figure 4 and Figure 8 As shown, along the length of the battery cell 1, the distance between the center of the second hole 221 and the edge of the second side 22 is f1, which satisfies 25mm≤f1≤75mm. This setting can both prevent damage to the insulating film 2 and ensure the positioning effect of the second hole 221.

[0061] It is worth noting that if f1 < 25mm, the second hole 221 is too close to the edge of the second side 22, making it difficult to open the second hole 221. After the second hole 221 is opened, the remaining part of the edge of the second side 22 is too small, which can easily lead to damage to the insulating film 2. If f1 > 75mm, the second hole 221 is too far from the edge of the second side 22, making it difficult to use the second hole 221 to position the insulating film 2, which affects the positioning accuracy of the insulating film 2.

[0062] Optionally, the value of f1 can be any value among 25mm, 28mm, 30mm, 35mm, 38mm, 40mm, 45mm, 48mm, 50mm, 55mm, 58mm, 60mm, 65mm, 68mm, 70mm, 72mm, and 75mm, as well as any value between any two values.

[0063] It should be noted that you should refer to [link / reference]. Figure 8 Since the first hole 211 is closer to the center of the first surface 11 along the length direction than the second hole 221, e1 > f1 is satisfied.

[0064] In one embodiment, such as Figure 4 and Figure 8 As shown, along the thickness direction of the battery cell 1, the distance between the center of the second hole 221 and the edge of the second side 22 is f2, and the thickness of the battery cell 1 is c, satisfying 1 / 3 ≤ f2 / c ≤ 1 / 2. This arrangement can both prevent damage to the insulating film 2 and ensure the insulation effect of the battery cell 1.

[0065] It is worth noting that if f2 / c < 1 / 3, the second hole 221 is too close to the edge of the second side 22, making it difficult to open the second hole 221. After the second hole 221 is opened, the remaining part of the edge of the second side 22 is too small, which can easily lead to damage to the insulating film 2. If f2 / c > 1 / 2, the second hole 221 is too far from the edge of the second side 22, and the second hole 221 is likely to exceed the overlap of the first side 21 and the second side 22, making it difficult to guarantee the insulation effect of the battery cell 1.

[0066] Optionally, the value of f2 / c can be any value from 1 / 3, 0.35, 0.38, 0.40, 0.42, 0.45, 0.48, 0.50, or any value between any two values.

[0067] In one embodiment, such as Figure 3 and Figure 8 As shown, the diameter of the first hole 211 is d1, and the thickness of the battery cell 1 is c, satisfying 0.2≤d1 / c≤0.35. This setting ensures the insulation effect of the battery cell 1 while improving the wetting efficiency of the battery cell 1.

[0068] It is worth noting that if d1 / c < 0.2, the diameter of the first hole 211 is too small, that is, the opening range of the first hole 211 is too small, which makes it difficult for the electrolyte to pass through the first hole 211 and affects the wetting efficiency of the battery cell 1; if d1 / c > 0.35, the diameter of the first hole 211 is too large, that is, the opening range of the first hole 211 is too large, and the battery cell 1 is easily exposed at the first hole 211, and the insulation effect of the battery cell 1 is not easy to guarantee.

[0069] Optionally, the value of d1 / c can be any value among 0.2, 0.23, 0.25, 0.28, 0.3, 0.32, and 0.35, as well as any value between any two values.

[0070] In one embodiment, such as Figure 4 and Figure 8 As shown, the diameter of the second hole 221 is d2, and the thickness of the battery cell 1 is c, satisfying 0.2≤d2 / c≤0.35. This configuration ensures the insulation effect of the battery cell 1 while improving its wetting efficiency.

[0071] It is worth noting that if d1 / c < 0.2, the diameter of the second hole 221 is too small, that is, the opening range of the second hole 221 is too small, which makes it difficult for the electrolyte to pass through the second hole 221 and affects the wetting efficiency of the cell 1; if d1 / c > 0.35, the diameter of the second hole 221 is too large, that is, the opening range of the second hole 221 is too large, and the cell 1 is easily exposed at the second hole 221, and the insulation effect of the cell 1 is not easy to guarantee.

[0072] Optionally, the value of d2 / c can be any value from 0.2, 0.23, 0.25, 0.28, 0.3, 0.32, 0.35, or any value between any two values.

[0073] In one embodiment, the battery has a bottom, which is adapted to be disposed close to the bottom plate of the battery pack housing, and the first surface 11 is disposed facing the bottom. That is, the first surface 11 serves as the bottom surface of the battery cell 1. Typically, a plate is disposed in the battery to support the battery cell 1. Therefore, in this embodiment, the plate is disposed corresponding to the first surface 11, and the plate can further ensure the insulation effect of the battery cell 1 on the first surface 11. Furthermore, the first hole 211 and the second hole 221 are both disposed corresponding to the bottom surface of the battery cell 1, which facilitates the electrolyte to enter the battery cell 1 through the first hole 211 and the second hole 221, thereby improving the wetting effect of the electrolyte on the battery cell 1.

[0074] 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, characterized by, The application relates to a battery shell. The battery shell comprises a shell body and a cover body, the shell body is provided with an opening, and the cover body is arranged on the opening and fixedly connected with the shell body. An insulating film (2) is arranged on the outer surface of the battery cell (1), the insulating film (2) has a first edge (21) and a second edge (22), the first edge (21) and the second edge (22) are at least partially overlapped in the orthographic projection on the first surface (11) of the battery cell (1), the first edge (21) is provided with a first hole body (211), the second edge (22) is provided with a second hole body (221), the first hole body (211) and the second hole body (221) are arranged in a staggered mode in the projection on the first surface (11), the center distance between the projection of the first hole body (211) on the first surface (11) and the projection of the second hole body (221) on the first surface (11) is a, and 5mm<=a<=35mm. The shortest distance between the edge of the projection of the first hole body (211) on the first surface (11) and the edge of the projection of the second hole body (221) on the first surface (11) is g, and 1mm<=g<=20mm.

2. The battery of claim 1, wherein, The first edge (21) and the second edge (22) are arranged on opposite sides of the insulating film (2), the insulating film (2) is arranged around four circumferential surfaces of the battery cell (1), and one of the four circumferential surfaces is the first surface (11).

3. The battery according to claim 1 or 2, characterized in that, The outer surface of the battery cell (1) further comprises two end surfaces, the two end surfaces are arranged in a spaced mode, each end surface is connected with the four circumferential surfaces, and the two end surfaces respectively lead out electrodes.

4. The battery of claim 3, wherein, The first surface (11) is a surface enclosed by the length direction and the thickness direction of the battery cell (1).

5. The battery according to claim 1 or 2, characterized by The first edge (21) is located on the side of the second edge (22) away from the first surface (11), the diameter of the second hole body (221) is d2, and 1mm<=d2<=6mm.

6. The battery according to claim 1 or 2, characterized by The first hole body (211) is arranged close to the center of the first surface (11) in the length direction relative to the second hole body (221).

7. The battery of claim 6, wherein, In the thickness direction of the battery cell (1), the width of the overlapping part of the first edge (21) and the second edge (22) is b, the thickness of the battery cell (1) is c, and 0.85<=b / c<=0.

98.

8. The battery of claim 5, wherein, The width b of the overlapping part of the first edge (21) and the second edge (22) satisfies 17mm<=b<=79mm, and the thickness c of the battery cell (1) satisfies 20mm<=c<=80mm.

9. The battery of claim 8, wherein, In the length direction of the battery cell (1), the distance between the center of the first hole body (211) and the edge of the first edge (21) is e1, and 25mm<=e1<=75mm; and / or, 10. The battery of claim 5, wherein, In the thickness direction of the battery cell (1), the distance between the center of the first hole body (211) and the edge of the first edge (21) is e2, the thickness of the battery cell (1) is c, and 1 / 3<=e2 / c<=1 / 2. ​ 11. The battery of claim 5, wherein, Along the length direction of the electric core (1), the distance between the center of the second hole body (221) and the edge of the second edge portion (22) is f1, and 25mm≤f1≤75mm is satisfied; and / or, Along the thickness direction of the electric core (1), the distance between the center of the second hole body (221) and the edge of the second edge portion (22) is f2, and the thickness of the electric core (1) is c, and 1 / 3≤f2 / c≤1 / 2 is satisfied.

12. The battery of claim 5, wherein, The diameter of the first hole body (211) is d1, the thickness of the electric core (1) is c, and 0.2≤d1 / c≤0.35 is satisfied; and / or, The diameter of the second hole body (221) is d2, the thickness of the electric core (1) is c, and 0.2≤d2 / c≤0.35 is satisfied.

13. The battery of claim 1 or 2, wherein, The battery has a bottom portion adapted to be disposed close to a bottom plate of a battery pack box body, and the first surface (11) is disposed towards the bottom portion.

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