Battery

Abstract

The utility model provides a battery which comprises a battery cell body and a packaging piece packaged in the battery cell body, and the packaging piece comprises a first sealing edge, a first connecting part and two second sealing edges; the first sealing edge is arranged at the top of the battery cell body, and the first sealing edge is bent from one end close to the battery cell body to the top surface of the battery cell body; the two second sealing edges are arranged on the two sides of the battery cell body, and the second sealing edges are bent from one end close to the battery cell body to the side surface direction of the battery cell body; the first connecting part is connected between the first sealing edge and the second sealing edge; a first notch is formed in the end, away from the first sealing edge and the second sealing edge, of the first connecting part and located on the extending face of the first end of the second sealing edge, and / or the first notch is located on the extending face of the end of the first sealing edge. According to the battery provided by the invention, the volume energy density of the battery can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to a battery. Background Art

[0002] At present, soft-pack lithium-ion batteries are packaged with aluminum-plastic film or steel-plastic film on bare cells (JR) to encapsulate the bare cell body and electrolyte, and lead out the tabs from the head of the JR for connection with other structures of electronic products. Usually, the aluminum-plastic film used to package the JR includes a pit area for holding the JR and the electrolyte, and a sealing edge located around the pit area and isolating the JR and the electrolyte from air and moisture. Among them, the packaging edge with positive and negative tabs extending out is called the top seal in the battery production process, and the two side seals perpendicular to the top seal and located on both sides of the battery body are called the two side seals. The top seal is parallel to the top surface of the battery body. However, the top seal occupies a large space, which will reduce the size of the battery body and reduce the unit volume capacity of the battery, thereby reducing the volume energy density (ED) of the battery.

[0003] To solve the above problems, the current main idea is to bend the top seal 90 degrees directly to fit the top surface of the battery cell body, and bend the side seal 90 degrees directly to fit the side of the battery cell body. The connection position of the bent top seal and the bent side seal forms two protruding sharp corners. Although the length and width of the battery cell are reduced compared to before the top seal and the side seal are bent, because the sharp corners protrude from the battery cell body, the protruding sharp corners also increase the overall length of the battery cell in the length direction of the battery cell, and increase the overall width of the battery cell in the width direction of the battery cell. The protruding sharp corners take up a lot of space, and the volume energy density of the battery is still low. Utility Model Content

[0004] The utility model provides a battery to solve the problem that the sharp corners protruding after the top seal and the side seal are bent in the existing battery occupy a large space and reduce the volume energy density of the battery.

[0005] The present application provides a battery, comprising a cell body and a package encapsulated in the cell body, the package comprising a first edge seal, a first connecting portion, and two second edge seals; the first edge seal is provided at the top of the cell body, and the first edge seal is bent from one end close to the cell body toward the top surface of the cell body; two second edge seals are provided on both sides of the cell body, and the second edge seals are bent from one end close to the cell body toward the side surface of the cell body; the first connecting portion is connected between the first edge seal and the second edge seal;

[0006] A first notch is provided at one end of the first connecting portion away from the first edge seal and the second edge seal, and the first notch is located on an extension surface of the first end of the second edge seal and / or the first notch is located on an extension surface of an end portion of the first edge seal.

[0007] Preferably, the total height of the first notch and the first connecting portion is h, the height of the first notch (23) is h1, and h1:h is (1 / 10~1 / 4):1;

[0008] The cross-sectional shape of the first notch is a figure formed by a combination of a polygon, an arc and a straight line.

[0009] Preferably, the first connecting portion is bent from the end of the first edge seal toward the side of the first edge seal away from the second edge seal; the angle α between the side of the first connecting portion facing the first edge seal and the side of the first edge seal away from the battery cell body is 10-80°.

[0010] Preferably, the battery further comprises a first adhesive member, and the first adhesive member is provided between a surface of the first connecting portion facing the first edge seal and a surface of the first edge seal away from the second edge seal and away from the battery cell body.

[0011] Preferably, the packaging component includes two first connecting portions, and the two first connecting portions are arranged at both ends of the first edge sealing;

[0012] The first connecting portion includes a first part and the first notch, the first side of the first part is connected to the first edge seal, and the second side of the first part is connected to the first end of the second edge seal; the first notch is set at an end of the first part away from the first edge seal and the second edge seal.

[0013] Preferably, the first connecting portion further includes a second portion, and the second portion is arranged at an end of the first portion away from the first edge seal and the second edge seal;

[0014] The second portion is bent toward the interior of the first portion to form the first notch; or, the second portion is bent toward the first surface of the first portion to form the first notch; or, the second portion is bent toward the second surface of the first portion to form the first notch; one side of the first surface is connected to the first edge seal, and one side of the second surface is connected to the second edge seal;

[0015] The side of the second part facing the first part is in contact with the first part.

[0016] Preferably, the first connecting portion further includes a second portion, which is arranged at an end of the first portion away from the first edge seal and the second edge seal; the first notch is formed by cutting off the second portion.

[0017] Preferably, a first sealing insulating layer is provided at the connection position between the first portion and the first notch.

[0018] Preferably, the battery further comprises a second thermally conductive adhesive member, and the second thermally conductive adhesive member is arranged between the first edge seal and the top surface of the battery cell body.

[0019] Preferably, the battery further comprises a third thermally conductive adhesive member, and the third thermally conductive adhesive member is arranged between the second edge seal and the side surface of the battery cell body.

[0020] Preferably, the battery further comprises a tab, which is arranged on the top surface of the battery cell body. The tab comprises a second connecting portion and an extension portion, the second connecting portion is connected to the battery cell body and is sealed with the first edge seal, the extension portion is arranged to extend from the second connecting portion in a direction away from the battery cell body and extends out of the first edge seal, and the extension portion is arranged in an extension area in the length direction of the battery cell body.

[0021] Preferably, the second edge seal includes a second end, the second end is arranged at an end of the second edge seal away from the first edge seal, the second end includes a third part and a second notch, one side of the third part is connected to the battery cell body, and the second notch is arranged on a side of the third part away from the battery cell body.

[0022] Preferably, the second end further includes a fourth portion, the fourth portion being provided on a side of the third portion away from the battery cell body, the fourth portion being bent toward the third portion to form the second notch, and a surface of the fourth portion facing the third portion abutting against the third portion;

[0023] Alternatively, the fourth portion is cut away to form the second gap.

[0024] In the battery provided in the present application, a first notch is provided at one end of the first connecting portion away from the first edge seal and the second edge seal, which reduces the space occupied by the first connecting portion in both the length and width directions of the battery cell body and improves the volume energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a battery provided by the present invention, in which the first sealing edge and the second sealing edge are not bent;

[0026] Figure 2This is a schematic diagram of the structure of a battery provided by the present invention - the second area is bent, the fourth area is bent, and the first and second edge seals are not bent;

[0027] Figure 3 This is a schematic structural diagram of a battery provided by one embodiment of the present invention - bending to form a first connecting portion;

[0028] Figure 4 This is a schematic structural diagram of a battery-first connecting portion after bending, provided by one embodiment of the present utility model;

[0029] Figure 5 This is a structural schematic diagram of a battery provided by an embodiment of the present invention, in which a first adhesive member is provided between the first connecting portion and the first sealing edge.

[0030] 1. Cell body; 2. Package; 21. First edge seal; 2121. First part; 22. Second edge seal; 221. Third part; 222. Fourth part; 23. First notch; 24. Second notch; 25. First connecting portion; 26. First area; 27. Second area; 3. First adhesive; 4. Tab; 41. Extension. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for description.

[0033] like Figure 2-Figure 5 As shown, an embodiment of the present application provides a battery, the battery comprising a cell body 1 and a package 2 packaged in the cell body 1, the package 2 comprising a first edge seal 21, a first connecting portion 25 and two second edge seals 22; the first edge seal 21 is provided at the top of the cell body 1, and the first edge seal 21 is bent from one end close to the cell body 1 toward the top surface of the cell body 1; two second edge seals 22 are provided on both sides of the cell body 1, and the second edge seals 22 are bent from one end close to the cell body 1 toward the side surface of the cell body 1; the first connecting portion 25 is connected between the first edge seal 21 and the second edge seal 22;

[0034] A first notch 23 is provided at one end of the first connecting portion 25 away from the first edge seal 21 and the second edge seal 22 . The first notch 23 is located on an extension surface of the second edge seal 22 and / or on an extension surface of an end portion of the first edge seal 21 .

[0035] Specifically, such as Figure 1 、 2 As shown, the packaging member 2 is a packaging bag comprising an aluminum-plastic film. The battery cell body 1 is packaged in the packaging member 2 to prevent battery leakage.

[0036] The package 2 includes a packaging edge, which refers to the structure formed by extending the periphery of the battery cell body 1 when the package 2 is sealed along the periphery of the battery cell body 1. The package 2 includes a first sealing edge 21 and two second sealing edges 22. The first sealing edge 21 is set at the top of the battery cell body 1. The first sealing edge 21 is the top sealing edge. The top sealing edge is the packaging edge formed on the outside of the top surface of the battery cell body 1. The two second sealing edges 22 are respectively set on both sides of the battery cell body 1, such as one second sealing edge 22 is set on the left side of the battery cell body 1 and the other second sealing edge 22 is set on the right side of the battery cell body 1; the two second sealing edges 22 are side sealing edges. Side sealing edges are packaging edges formed on opposite sides of the battery cell body 1, and the two side sealing edges are respectively located on opposite sides of the top sealing edge.

[0037] like Figure 3 As shown, the first edge seal 21 is bent from one end close to the battery cell body 1 toward the top surface of the battery cell body 1, that is, a top edge seal is formed on the outside of the top surface of the battery cell body 1. From one end of the battery cell body 1, that is, the side where the top edge seal abuts the battery cell body 1, it is bent toward the top surface of the battery cell body 1, and also bent in the direction of the thickness of the battery cell body 1. After bending, the top surface of the battery cell body 1 is in contact with the first edge seal 21, which has the effect of reducing the length of the battery, reducing the space occupied in the length direction of the battery, and improving the volume energy density of the battery. The angle between the first edge seal 21 and the top surface of the battery cell body 1 after bending is not limited in this application and can be set according to actual needs. Preferably, the first edge seal 21 is parallel to the top surface of the battery cell body 1, that is, the top edge seal is bent 90° from the side abutting the battery cell body 1 as the starting edge. After bending, the first edge seal 21 is in contact with the top surface of the battery cell body 1.

[0038] The second edge seal 22 is bent from one end close to the battery cell body 1 toward the side of the battery cell body 1, that is, a side edge seal is formed on the opposite sides of the battery cell body 1. From one end of the battery cell body 1, that is, the side where the side edge seal abuts the battery cell body 1, it is bent toward the side of the battery cell body 1, or bent toward the thickness direction of the battery cell body 1. After bending, the second edge seal 22 faces the surface of the battery cell body 1 and fits the side of the battery cell body 1, which has the effect of reducing the overall width of the battery, reducing the space occupied in the width direction of the battery, and improving the volume energy density of the battery. The angle between the second edge seal 22 and the side of the battery cell body 1 after bending is not limited in this application and can be set according to actual needs. Preferably, the angle between the second edge seal 22 and the side of the battery cell body 1 is 0°, that is, the side edge seal is bent 90° from the side abutting the battery cell body 1 as the starting edge.

[0039] like Figure 3 As shown, the first connecting portion 25 is connected between the first edge seal 21 and the second edge seal 22. It should be noted that the structure of the first connecting portion 25 is formed after the first edge seal 21 and the second edge seal 22 are both bent.

[0040] A first notch 23 is provided at one end of the first connecting portion 25 away from the first edge seal 21 and the second edge seal 22. Compared with the existing method in which the first notch 23 is not provided, the present application provides the first notch 23 in the first connecting portion 25, thereby reducing the width in the width direction of the battery cell body 1 and the length in the length direction of the battery cell body 1, reducing the space occupied by the first connecting portion 25 and improving the volume energy density of the battery.

[0041] The position of the first notch 23 is as follows: the first notch 23 is located on the extension surface of the first end of the second edge seal 22, or the first notch 23 is located on the extension surface of the end of the first edge seal 21, or the first notch 23 is located on the extension surface of the first end of the second edge seal 22 and the extension surface of the end of the first edge seal 21.

[0042] Due to the provision of the first notch 23 , after the first sealing edge 21 and the second sealing edge 22 are bent, compared to the prior art without the first notch 23 , the overall height of the first connecting portion 25 protruding from the battery cell body 1 is smaller, thereby reducing the space occupied.

[0043] It should be noted that the first edge seal 21 is bent toward the top surface of the battery cell body 1, and after bending, the first edge seal 21 exceeds the thickness of the battery cell body 1, or after bending, the first edge seal 21 does not exceed the thickness of the battery cell body 1; further preferably, the first edge seal 21 does not exceed the thickness of the battery cell body 1 after bending.

[0044] The second edge seal 22 is bent toward the side of the battery cell body 1 , and after bending, the second edge seal 22 exceeds the thickness of the battery cell body 1 , or after bending, the second edge seal 22 does not exceed the thickness of the battery cell body 1 ; further preferably, the second edge seal 22 does not exceed the thickness of the battery cell body 1 after bending.

[0045] In the battery provided in the present application, a first notch 23 is provided at one end of the first connecting portion 25 away from the first sealing edge 21 and the second sealing edge 22. This reduces the space occupied by the first connecting portion 25 in both the length and width directions of the battery cell body 1, thereby improving the volume energy density of the battery.

[0046] In some embodiments, the total height of the first connecting portion 25 and the first notch 23 is h, the height of the first notch 23 is h1, and h1:h is (1 / 10-1 / 4):1.

[0047] Specifically, h1:h is (1 / 10~1 / 4):1, which limits the height of the first notch 23, reduces the overall size of the battery, reduces the overall occupied space of the battery, and improves the volume energy density of the battery.

[0048] In some embodiments, h1 is 0.2-0.6 mm.

[0049] In some embodiments, the cross-sectional shape of the first notch 23 is a figure formed by a combination of a polygon, an arc, and a straight line.

[0050] The number of sides of a specific polygon is n, where n≥3, including triangles, quadrilaterals, etc. The figures formed by the combination of arcs and straight lines include figures formed by the combination of two straight lines and an arc, such as a sector, etc.; or figures formed by the combination of two or more straight lines and arcs, etc.

[0051] In some embodiments, the first connecting portion 25 is bent from the end of the first edge seal 21 toward the side of the first edge seal 21 away from the second edge seal 22; the angle α between the side of the first connecting portion 25 facing the first edge seal 21 and the side of the first edge seal 21 away from the battery cell body 1 is 10-80°.

[0052] Specifically, after the first and second side seals 21 and 22 are bent, the side surface connected to one end of the first side seal 21 in the portion between the first and second side seals 21 and 22 facing the cell body 1 is defined as the first side surface, and the side surface connected to one end of the second side seal 22 in the portion between the first and second side seals 21 and 22 facing the cell body 1 is defined as the second side surface. The second side surface is bent toward the first side surface, or the first side surface is bent toward the second side surface so that the first and second side surfaces are in contact with each other. The edge where the first and second side surfaces intersect is defined as the intersecting edge. After the first or second side surfaces are bent and contacted, the structure formed is the structure of the first connecting portion 25.

[0053] Preferably, it can be understood that the areas of the first side surface and the second side surface can be equal or different, and this application does not limit this. When the areas of the first side surface and the second side surface are equal, the first connecting portion 25 is obtained by folding the first side surface and the second side surface in half.

[0054] The cross-sectional shape of the first connecting portion 25 can be a polygon, a shape combining an arc and a straight line, an ellipse, a circle, etc. A shape combining an arc and a straight line, such as a sector, a shape combining a quadrilateral and an arc, etc.

[0055] The first connecting portion 25 is bent from the end of the first edge seal 21 to the side of the first edge seal 21 away from the second edge seal 22, and after the bending, the angle α between the side of the first connecting portion 25 facing the first edge seal 21 and the side of the first edge seal 21 away from the battery body is 10-80°. The folding method is optimized, the space of the first connecting portion 25 in the length direction of the battery is reduced, and the volume energy density of the battery is reduced. Limiting the angle α to the range of 10-80° can reduce wrinkles on the second edge seal 22 of the package 2, prevent damage to the material of the package 2, and cause battery corrosion and leakage, and facilitate production and operation; and solves the problem that pressing the sharp corners of the battery easily causes serious wrinkles of the aluminum-plastic film in the top side ridge area, resulting in corner corrosion and even battery leakage.

[0056] In some embodiments, the battery further includes a first adhesive member 3 , and the first adhesive member 3 is disposed between a surface of the first connecting portion 25 facing the first edge seal 21 and a surface of the first edge seal 21 facing away from the battery cell body 1 .

[0057] Specifically, the first adhesive member 3 is arranged between the first connecting portion 25 and the first sealing edge 21, and has the following functions: first, it plays a bonding role, bonding the first connecting portion 25 and the first sealing edge 21; second, it plays a supporting role, controlling the angle α within the range of 10-80°; third, it plays a heat conducting role, transferring the heat during the battery charging and discharging process to reduce the battery heat; fourth, it plays an insulating role, preventing the battery from short circuiting; fifth, it has high elasticity, waterproofness, and dustproofness.

[0058] In some preferred embodiments, the angle α is 30-60°.

[0059] More preferably, the angle α is 45°.

[0060] In some embodiments, the package 2 includes two first connecting portions 25, and the two first connecting portions 25 are arranged at both ends of the first edge seal 21; the first connecting portion 25 includes a first part 2121 and a first notch 23, the first side of the first part 2121 is connected to the first edge seal 21, and the second side of the first part 2121 is connected to the first end of the second edge seal 22; the first notch 23 is arranged at an end of the first part 2121 away from the first edge seal 21 and the second edge seal 22.

[0061] Specifically, the cell body 1 includes two second edge seals 22 and one first edge seal 21, and the two second edge seals 22 are arranged between the first edge seals 21. Figure 2 、 3 As shown, the two second edge seals 22 are respectively located on the left and right sides of the battery cell body 1, the first first connection portion 25 is connected between the second edge seal 22 and the first edge seal 21 on the left, and the second first connection portion 25 is connected between the second edge seal 22 and the first edge seal 21 on the right.

[0062] The first connecting portion 25 includes a first portion 2121, which is used to connect the first edge seal 21 and the second edge seal 22. A first notch 23 is provided at one end of the first portion 2121, away from the first and second edge seals 21 and 22. This reduces the space occupied by the first connecting portion 25 on the top surface of the battery, facilitating connection between the battery and other components.

[0063] Further preferably, the side surfaces of the cell body 1 include two oppositely disposed first side surfaces and two oppositely disposed second side surfaces, wherein the area of ​​the first side surfaces is greater than the area of ​​the second side surfaces. After being bent, the first edge seal 21 is perpendicular to the first side surfaces of the cell body 1, and the second edge seal 22 is perpendicular to the first side surfaces of the cell body 1 after being bent.

[0064] The first notch 23 can be formed by directly removing a portion of the packaging material of the first connecting portion 25 away from the first edge seal 21 and the second edge seal 22, or by bending a portion of the packaging material of the first connecting portion 25 away from the first edge seal 21 and the second edge seal 22 inward, or by bending a portion of the packaging material of the first connecting portion 25 away from the first edge seal 21 and the second edge seal 22 toward the first edge seal 21 or toward the second edge seal 22. In this case, the position of the portion of the packaging material away from the first edge seal 21 and the second edge seal 22 before bending is the formed first notch 23.

[0065] It should be noted that the bending angle of the portion of the packaging material away from the first edge seal 21 and the second edge seal 22 is preferably greater than 90°, so that after bending, the portion of the packaging material away from the first edge seal 21 and the second edge seal 22 can form a first notch 23 at the position before bending.

[0066] In one embodiment, the first connecting portion 25 further includes a second portion, which is disposed at an end of the first portion 2121 away from the first edge seal 21 and the second edge seal 22. The second portion is bent toward the interior of the first portion 2121 to form the first notch 23; or, the second portion is bent toward the first surface of the first portion 2121 to form the first notch 23; or, the second portion is bent toward the second surface of the first portion 2121 to form the first notch 23; one side of the first surface is connected to the first edge seal 21, and one side of the second surface is connected to the second edge seal 22.

[0067] The side of the second portion facing the first portion 2121 is in contact with the first portion 2121. Specifically, the first connecting portion 25 is divided into a first portion 2121 and a second portion. The first portion 2121 includes a first surface and a second surface. One side edge of the first surface is connected to the first edge seal 21, and one side edge of the second surface is connected to the second edge seal 22. The second portion 2122 is disposed at an end of the first portion 2121 away from the first and second edge seals 21, 22. The first surface refers to the side surface of the first portion 2121 facing away from the battery cell body 1 and connected to the first edge seal 21. The second surface refers to the side surface of the first portion 2121 facing away from the battery cell body 1 and connected to the second edge seal 22.

[0068] There are at least four ways to form the first notch 23: one is to bend the second part toward the inner direction of the first part 2121, and after bending, the second part faces the side of the first part 2121 and fits with the first part 2121; the original position of the second part is the first notch 23.

[0069] The second is to bend the second portion toward the first surface of the first portion 2121 , so that the second portion faces the side surface of the first portion 2121 and fits the first portion 2121 ; the original position of the second portion is the first notch 23 .

[0070] The third step is to bend the second portion toward the second surface of the first portion 2121 . After bending, the second portion faces the side surface of the first portion 2121 and fits in with the first portion 2121 . The original position of the second portion is the first notch 23 .

[0071] In order to make the connection between the first part 2121 and the second part more stable, an adhesive layer may be provided on the surface of the first part 2121 facing the second part to bond the first part 2121 to the second part.

[0072] The fourth is as Figure 1 、 2 As shown, Figure 1 、 2 This is a schematic diagram of the structure where the first edge seal 21 and the second edge seal 22 are not bent. Figure 1 The connection position of the first edge seal 21 and the second edge seal 22 is divided into a first area 26 and a second area 27. One side of the first area 26 is connected to the first edge seal 21, and the other side of the first area 26 is connected to the second edge seal 22. The second area 27 is provided at the end of the first area 26 away from the first edge seal 21 and the second edge seal 22. Figure 2 As shown, the second surface 27 is bent toward the first surface 26 so that the surface of the first surface 26 facing the second surface 27 is in contact with the second surface 27; Figure 2 The dotted line indicates the location of the second surface 27 before bending. The first and second edge seals 21, 22 are then bent, and the first and second surfaces 26, 27 are folded in half to form the first connecting portion 25. The location of the second surface 27 after bending becomes the first notch 23. To further secure the connection between the first and second surfaces 26, 27, an adhesive layer can be applied to the surface of the first surface 26 facing the second surface 27 to bond the first and second surfaces 26, 27 together.

[0073] In some embodiments, the first connecting portion 25 further includes a second portion, which is disposed at an end of the first portion 2121 away from the first edge seal 21 and the second edge seal 22 ; the first notch 23 is formed by cutting off the second portion.

[0074] Specifically, there are at least two methods for forming the first notch 23. The first method is to directly cut off the second portion, forming the first notch 23 at the location of the original second portion. The second method is to directly cut off the second area 27, then bend the first and second edge seals 21, 22, and fold the first area 26 in half to form the first connecting portion 25.

[0075] In one embodiment, a first sealing insulating layer is provided at the connection position between the first portion 2121 and the first notch 23 .

[0076] Regardless of whether the first notch 23 is formed by directly cutting off the second part, or the first notch 23 is formed by bending the second part toward the first part 2121, or the second section surface 27 is bent toward the first section surface 26, or the second section surface 27 is directly cut off, serious wrinkles may occur at the connection between the first part 2121 and the second part 2122, and at the connection between the first section surface 26 and the second section surface 27, or the package 2 material may be damaged. Therefore, a first sealing insulating layer is provided at the connection position between the first part 2121 and the first notch 23. The first sealing insulating layer has the functions of bonding, sealing, insulation, and preventing aluminum leakage.

[0077] In one embodiment, the battery further includes a second thermally conductive adhesive member, which is disposed between the first edge seal 21 and the top surface of the battery cell body 1 .

[0078] Specifically, the second heat-conducting adhesive is arranged between the first edge seal 21 and the top surface of the battery cell body 1, and has the following functions: first, it bonds the first edge seal 21 and the battery cell body 1; second, it plays a heat-conducting role, transferring the heat during the battery charging and discharging process to reduce the battery heat; third, it plays an insulating role to prevent the battery from short circuiting; fourth, it has high elasticity, waterproofness and dustproofness.

[0079] In one embodiment, the battery further includes a third thermally conductive adhesive member, which is disposed between the second edge seal 22 and the side surface of the battery cell body 1 .

[0080] Specifically, the third heat-conducting adhesive is arranged between the second edge seal 22 and the side of the battery cell body 1, and has the following functions: first, it bonds the second edge seal 22 to the battery cell body 1; second, it plays a heat-conducting role, transferring the heat during the battery charging and discharging process to reduce the battery heat; third, it plays an insulating role to prevent the battery from short circuiting; fourth, it has high elasticity, waterproof and dustproof effects.

[0081] In one embodiment, the battery further includes a tab 4, which is arranged on the top surface of the battery cell body 1. The tab 4 includes a second connecting portion and an extension portion 41. The second connecting portion is connected to the battery cell body 1 and is sealed with the first edge seal 21. The extension portion 41 extends from the second connecting portion in a direction away from the battery cell body 1 and extends out of the first edge seal 21. The extension portion 41 is arranged in an extended area in the length direction of the battery cell body 1.

[0082] Specifically, the second connection portion of the tab 4 is disposed inside the first edge seal 21 and is sealed to the first edge seal 21 to prevent battery leakage. The extension portion 41 extends beyond the first edge seal 21 for connection to the protective plate.

[0083] After the first edge seal 21 is bent, the extension portion 41 is bent away from the side of the cell body 1 , so that the extension portion 41 is arranged in the extension area in the length direction of the cell body 1 , which facilitates the connection between the extension portion 41 and the protection plate.

[0084] In one embodiment, the second edge seal 22 includes a second end, which is arranged at an end of the second edge seal 22 away from the first edge seal 21, and the second end includes a third portion 221 and a second notch 24. One side of the third portion 221 is connected to the battery cell body 1, and the second notch 24 is provided on the side of the third portion 221 away from the battery cell body 1.

[0085] Specifically, such as Figure 2 As shown, the second end of the second edge seal 22 is disposed at an end of the second edge seal 22 away from the first edge seal 21, or the second end of the second edge seal 22 is disposed on a side of the second edge seal 22 close to the bottom of the battery cell body 1. The second notch 24 disposed at the second end has the effect of reducing the size of the sharp corner protruding from the bottom of the finished battery cell, thereby increasing the overall energy density of the battery cell.

[0086] The present application does not limit the shape of the second notch 24. For example, the second notch 24 may be in the shape of a polygon, an ellipse, a circle, or a combination of arcs and straight lines. A polygon may be, for example, a triangle, a quadrilateral, a pentagon, or a hexagon. A combination of arcs and straight lines may be in the shape of a sector.

[0087] In one embodiment, the second end further includes a fourth portion 222, and the fourth portion 222 is provided on a side of the third portion 221 away from the battery cell body 1, and the fourth portion 222 is bent toward the third portion 221 to form the second notch 24, and a side surface of the fourth portion 222 facing the third portion 221 abuts against the third portion 221; or, the fourth portion 222 is cut off to form the second notch 24.

[0088] Specifically, such as Figure 1 As shown, before the second edge seal 22 is bent, the fourth portion 222 is arranged on the side of the third portion 221 away from the battery cell body 1, and the fourth portion 222 is bent toward the third portion 221, and a side surface of the fourth portion 222 facing the third portion 221 abuts against a side surface of the third portion 221 facing the fourth portion 222. The position of the fourth portion 222 before bending is the second notch 24, as shown in FIG. Figure 2 The dotted line position is the second notch 24 , and the position of the second notch 24 is also the original position of the fourth portion 222 before bending.

[0089] As for the formation method of the second notch 24 , the fourth portion 222 may be directly removed, and the original position of the fourth portion 222 becomes the second notch 24 .

[0090] In some embodiments, a second sealing insulation layer is provided at the connection position between the third portion 221 and the second notch 24 .

[0091] Regardless of whether the second notch 24 is formed by directly cutting off the third part 221 or by bending the third part 221 toward the fourth part 222 to form the second notch 24, serious wrinkles may occur at the connection between the third part 221 and the fourth part 222, or the material of the package 2 may be damaged. Therefore, a second sealing insulating layer is provided at the connection position between the third part 221 and the second notch 24. The second sealing insulating layer has the functions of bonding, sealing, insulating, and preventing aluminum leakage.

[0092] The first adhesive member 3, the second thermally conductive adhesive member, and the third thermally conductive adhesive member are double-sided adhesive tape, high-temperature adhesive tape, or glue with thermal conductivity, insulation, dustproofness, waterproofness, high elasticity, and high viscosity. The high-temperature adhesive tape is made of PI, PET, or PP.

[0093] The first sealing insulation layer and the second sealing insulation layer are made of UV glue, PI glue, PET glue or PP glue.

[0094] In order to distinguish the first area 26 and the second area 27, Figure 1 The dividing line of the first zone surface 26, the dividing line of the second zone surface 27, and the dividing line between the fourth part 222 and the third part 221 are drawn in the figure. It should be noted that in the actual production process, there is no dividing line between the first zone surface 26 and the second zone surface 27, and there is no dividing line between the fourth part 222 and the third part 221. Figure 2 One of the dotted lines represents the position of the second region 27 before bending, and the dotted line in the second notch 24 represents the position of the fourth portion 222 before bending; Figure 2 The dotted lines are supplemented for easier understanding. There are no dotted lines in the actual production process.

[0095] Example 1

[0096] The packaging method for the secondary sealed battery is as follows:

[0097] The structure of the battery cell after secondary sealing is as follows Figure 1 As shown, Figure 2 As shown, the second area surface 27 is bent toward the first area surface 26 so that the second area surface 27 is in contact with the first area surface 26 . At the same time, an adhesive layer is provided on the surface of the first area surface 26 facing the second area surface 27 so that the first area surface 26 and the second area surface 27 are bonded.

[0098] The battery cell body 1 includes two first side surfaces and two second side surfaces that are opposite to each other, and the area of ​​the first side surfaces is larger than the area of ​​the second side surfaces. Figure 3 As shown, the second edge seal 22 is bent toward the side direction of the battery cell body 1. After bending, the second edge seal 22 is perpendicular to the first side of the battery cell body 1; a third heat-conducting adhesive is provided between the second edge seal 22 and the first side of the battery cell body 1. The first edge seal 21 is bent toward the top surface of the battery cell body 1. After bending, the first edge seal 21 is perpendicular to the first side of the battery cell; a second heat-conducting adhesive is provided between the first edge seal 21 and the top surface of the battery cell body 1. After bending the first edge seal 21 and the second edge seal 22, the first zone surface 26 and the second zone surface 27 are folded in half at the same time to form a first connecting portion 25. After bending, the position of the original second zone surface 27 is the first notch 23, and after bending, the first zone surface 26 is the first part 2121. A first sealing insulating layer is provided at the connection position between the first part 2121 and the first notch 23. As shown Figure 2 As shown, the fourth part 222 of the second end of the second sealing edge 22 is bent toward the third part 221, so that the third part 221 and the fourth part 222 are abutted. Before bending, the position of the fourth part 222 is the second notch 24; a second sealing insulation layer is provided at the connection position between the third part 221 and the second notch 24.

[0099] like Figure 4 As shown, the first connecting portion 25 is bent from the end of the top edge seal toward the side of the first edge seal 21 away from the second edge seal 22, and the angle α between the side of the first connecting portion 25 facing the first edge seal 21 and the side of the first edge seal 21 away from the second edge seal 22 is 30°. Figure 5 As shown, a first bonding member 3 is provided between the first connecting portion 25 and the first sealing edge 21 .

[0100] The extension portion 41 of the tab 4 is bent away from the side of the cell body 1 so that the extension portion 41 of the tab 4 is disposed within the extension region in the length direction of the cell body 1. The extension portion 41 of the tab 4 is then welded to the protection plate.

[0101] Comparative Example 1

[0102] The battery of Comparative Example 1 adopts a conventional single folding edge, that is, only the second edge seal 22 of the battery is bent, and the second edge seal 22 is bent toward the side of the battery cell body 1. The second edge seal 22 is perpendicular to the first side of the battery cell body 1; a third thermally conductive adhesive is arranged between the second edge seal 22 and the first side of the battery cell body 1.

[0103] Comparative Example 2

[0104] In the battery of Comparative Example 2, the second edge seal 22 is bent toward the side of the cell body 1, perpendicular to the first side of the cell body 1; a third thermally conductive adhesive is disposed between the second edge seal 22 and the first side of the cell body 1. The first edge seal 21 is bent toward the top surface of the cell body 1, perpendicular to the first side of the cell; a second thermally conductive adhesive is disposed between the first edge seal 21 and the top surface of the cell body 1. After the first and second edge seals 21, 22 are bent, a convex corner protrudes from the cell body 1. After the first and second edge seals 21, 22 are bent, the convex corner is not bent.

[0105] The batteries of Example 1 and Comparative Examples 1-2 were tested for thickness, width, length, capacity, and volumetric energy density. Based on the volumetric energy density of the battery of Comparative Example 1, the batteries of Example 1 and Comparative Example 2 were tested to determine the improvement in volumetric energy density relative to Comparative Example 1. The test results are shown in Table 1.

[0106] Table 1

[0107] Group

[0108] Battery size

[0109] Battery capacity / mAh

[0110] Battery volume energy density (Wh / L)

[0111] Battery volume energy density improvement / %

[0112] Thickness / mm

[0113] Width / mm

[0114] Length / mm

[0115] Example 1 5.93 32 31.8 1180 766.5 6.9

[0122] Comparative Example 1 5.93 32 34 1180 716.9 0.0

[0129] Comparative Example 2 5.93 32 32.5 1180 750.0 4.6

[0136] It can be seen from Table 1 that, by comparing Example 1 with Comparative Examples 1 and 2, the battery length in Example 1 is smaller, the volume energy density of the battery is higher, and the improvement in the volume energy density of the battery is larger, reaching 6.9%, indicating that the battery packaging structure provided in the present application can reduce the length of the battery and increase the volume energy density of the battery.

[0137] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the aforementioned embodiments, or that some of the technical features may be replaced with equivalents. These modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention and are therefore intended to be included within the scope of protection of the present invention.

Claims

1. A battery, characterized in that: The battery comprises a cell body (1) and a package (2) packaged in the cell body (1), the package (2) comprising a first edge seal (21), a first connecting portion (25) and two second edge seals (22); the first edge seal (21) is arranged at the top of the cell body (1), and the first edge seal (21) is bent from one end close to the cell body (1) toward the top surface of the cell body (1); the two second edge seals (22) are arranged on both sides of the cell body (1), and the second edge seals (22) are bent from one end close to the cell body (1) toward the side surface of the cell body (1); the first connecting portion (25) is connected between the first edge seal (21) and the second edge seal (22); A first notch (23) is provided at one end of the first connecting portion (25) away from the first edge seal (21) and the second edge seal (22); the first notch (23) is located on an extension surface of the first end of the second edge seal (22), and / or the first notch (23) is located on an extension surface of the end of the first edge seal (21).

2. The battery according to claim 1, characterized in that The first connecting portion (25) is bent from the end of the first edge seal (21) toward a side of the first edge seal (21) away from the second edge seal (22); an angle α between a side of the first connecting portion (25) facing the first edge seal (21) and a side of the first edge seal (21) away from the battery cell body (1) is 10-80°.

3. The battery according to claim 1, characterized in that The total height of the first notch (23) and the first connecting portion (25) is h, the height of the first notch (23) is h1, and h1:h is (1 / 10~1 / 4):1; The cross-sectional shape of the first notch (23) is a figure formed by a combination of a polygon, an arc, and a straight line.

4. The battery according to claim 1, characterized in that The battery further comprises a first adhesive member (3), wherein the first adhesive member (3) is provided between a side of the first connecting portion (25) facing the first sealing edge (21) and a side of the first sealing edge (21) facing away from the battery cell body (1).

5. The battery according to claim 1, characterized in that The packaging component (2) comprises two first connecting portions (25), and the two first connecting portions (25) are arranged at two ends of the first sealing edge (21); The first connecting portion (25) comprises a first portion (2121) and the first notch (23); the first side edge of the first portion (2121) is connected to the first edge seal (21), and the second side edge of the first portion (2121) is connected to the first end of the second edge seal (22); the first notch (23) is provided at an end of the first portion (2121) away from the first edge seal (21) and the second edge seal (22).

6. The battery according to claim 5, characterized in that The first connecting portion (25) further comprises a second portion, the second portion being arranged at an end of the first portion (2121) away from the first edge seal (21) and the second edge seal (22); The second part is bent toward the inner direction of the first part (2121) to form the first notch (23); or, the second part is bent toward the first surface of the first part (2121) to form the first notch (23); or, the second part is bent toward the second surface of the first part (2121) to form the first notch (23); one side of the first surface is connected to the first edge seal (21), and one side of the second surface is connected to the second edge seal (22); The second part is in contact with the first part (2121) on the side facing the first part (2121).

7. The battery according to claim 5, characterized in that The first connecting portion (25) further comprises a second portion, the second portion being arranged at an end of the first portion (2121) away from the first edge seal (21) and the second edge seal (22); the second portion is cut away to form the first notch (23).

8. The battery according to claim 6 or 7, characterized in that A first sealing insulating layer is provided at the connection position between the first portion (2121) and the first notch (23).

9. The battery according to claim 5, characterized in that The battery further comprises a second heat-conducting adhesive component, which is arranged between the first sealing edge (21) and the top surface of the battery cell body (1).

10. The battery according to claim 1, characterized in that The battery further comprises a third heat-conducting adhesive component, and the third heat-conducting adhesive component is arranged between the second sealing edge (22) and the side surface of the battery cell body (1).

11. The battery according to claim 1, characterized in that The battery further comprises a tab (4), wherein the tab (4) is arranged on the top surface of the battery cell body (1), and the tab (4) comprises a second connecting portion and an extending portion (41), wherein the second connecting portion is connected to the battery cell body (1) and is sealed to the first edge seal (21), and the extending portion (41) extends from the second connecting portion in a direction away from the battery cell body (1) and extends out of the first edge seal (21), and the extending portion (41) is arranged in an extending region in the length direction of the battery cell body (1).

12. The battery according to claim 1, characterized in that The second edge seal (22) includes a second end, the second end being arranged at an end of the second edge seal (22) away from the first edge seal (21), the second end including a third portion (221) and a second notch (24), one side of the third portion (221) being connected to the battery cell body (1), and the second notch (24) being arranged at a side of the third portion (221) away from the battery cell body (1).

13. The battery according to claim 12, characterized in that The second end further comprises a fourth portion (222), the fourth portion (222) being provided on a side of the third portion (221) away from the battery cell body (1), the fourth portion (222) being bent toward the third portion (221) to form the second notch (24), and a surface of the fourth portion (222) facing the third portion (221) being in contact with the third portion (221); Alternatively, the fourth portion (222) is cut away to form the second notch (24).

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