Battery cell, battery, electric device, and packaging member

Abstract

The present application discloses a battery cell, a battery, an electric device, and a packaging member. The battery cell comprises a pouch, an electrode assembly, and electrode terminals. The pouch comprises a main body portion and a sealing portion; the electrode assembly is arranged in the main body portion; and the sealing portion comprises a first sealing portion, second sealing portions, and third sealing portions. The electrode terminals are connected to the electrode assembly and extend out of the first sealing portion. The second sealing portions are connected to the first sealing portion, the second sealing portions and the third sealing portions are arranged in a first direction, the third sealing portions are connected to the first sealing portion and the second sealing portions, and the third sealing portions are located in the intersection areas of the first sealing portion and the second sealing portions. The second sealing portions are bendably connected to the main body portion. Excessive cavities between the electrode assembly and the pouch form bulges which press the electrode assembly, such that the electrode assembly is prone to deformation, resulting in a risk of short circuit. In the present application, the formation of bulges of the pouch is reduced by means of the third sealing portions, and the damage to the electrode assembly due to pressing-induced deformation, or even the occurrence of decarbonization is reduced, thereby lowering the risk of short circuit in the battery cell.

Description

Cells, batteries, electrical equipment and packaging Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery cell, a battery, an electrical device, and a package. Background Art

[0002] Currently, soft-pack batteries are widely used in various electronic devices. Soft-pack batteries are packaged in packaging bags, and bare batteries are easily squeezed, deformed, and damaged, and may even cause a short circuit. Summary of the Invention

[0003] In view of this, it is necessary to provide a battery cell, a battery, an electrical device and a package to reduce the risk of battery cell short circuit.

[0004] An embodiment of the present application provides a battery cell, comprising a packaging bag, an electrode assembly and an electrode terminal. The packaging bag comprises a main body and a sealing portion, the electrode assembly is arranged in the main body, and the sealing portion comprises a first sealing portion, a second sealing portion and a third sealing portion. The electrode terminal is connected to the electrode assembly and extends from the first sealing portion. The second sealing portion is connected to the first sealing portion, the third sealing portion is connected to the first sealing portion and the second sealing portion, and the third sealing portion is located at the intersection of the first sealing portion and the second sealing portion, and the second sealing portion is bent to connect to the main body. When the second sealing portion is bent, the excess cavity between the electrode assembly and the packaging bag will form a bulge, and the bulge will squeeze the electrode assembly, which may easily cause the electrode assembly to deform and cause a short circuit risk. The present application reduces the generation of bulges in the packaging bag through the third sealing portion, reduces the occurrence of damage to the electrode assembly due to squeezing, deformation, or even decarbonization, and reduces the risk of short circuit in the battery cell.

[0005] In one or more of the above optional embodiments, the first sealing portion includes a first sealing edge. The third sealing portion includes a second sealing edge. The first sealing edge intersects the second sealing edge. At least a portion of the second sealing edge is configured as an arcuate edge away from the main body, which facilitates the third sealing portion being away from the main body, reducing the risk of crushing the electrode assembly during packaging, and further reducing the risk of damage to the main body during packaging of the third sealing portion.

[0006] In one or more of the above optional embodiments, the first sealing portion includes a first sealing edge. The third sealing portion includes a second sealing edge. The first sealing edge intersects the second sealing edge. At least a portion of the second sealing edge is configured as a straight edge. Configuring at least a portion of the second sealing edge as a straight edge increases the sealing area of ​​the third sealing portion, thereby reducing bulging of the packaging bag and lowering the risk of short circuiting of the battery cell.

[0007] In one or more of the above optional embodiments, a portion of the third sealing portion overlaps with the first sealing portion, which is beneficial to increasing the sealing strength and reducing the risk of leakage of the battery cell 100 .

[0008] In one or more optional embodiments above, along the first direction, the length of the third sealing portion is h1, satisfying 0.5mm≤h1≤15mm, and the first direction is the width direction of the battery cell. If h1 is less than 0.5mm, the length of the third sealing portion along the first direction is too short, which is not conducive to reducing the occurrence of bulging in the packaging bag and reducing the risk of damage to the electrode assembly due to extrusion and deformation. If h1 is greater than 15mm, the length of the third sealing portion along the first direction is too long, and the longer the distance the third sealing portion extends along the first direction, the closer the third sealing portion is to the main body, and when encapsulating the third sealing portion, it is easy to cause damage to the main body or the electrode assembly. The present application sets h1 to 0.5mm≤h1≤15mm, which is conducive to reducing the occurrence of bulging in the packaging bag, reducing the risk of damage to the electrode assembly due to extrusion and deformation, resulting in short circuit of the battery cell, and reducing the risk of damage to the main body.

[0009] In one or more of the above optional embodiments, h1 satisfies 0.5mm≤h1≤5mm, which is beneficial to reducing the occurrence of bulging in the packaging bag, reducing the risk of the electrode assembly being damaged by extrusion and deformation, resulting in short circuit of the battery cell, and further reducing the risk of damage to the main body.

[0010] In one or more of the above optional embodiments, h1 satisfies 1mm≤h1≤3mm, which is further beneficial to reducing the occurrence of bulging in the packaging bag, reducing the risk of the electrode assembly being damaged by extrusion and deformation, resulting in short circuit of the battery cell, and further reducing the risk of damage to the main body.

[0011] In one or more of the above optional embodiments, the main body includes a first side wall, the second sealing portion is connected to the first side wall, the battery cell includes an insulating part, the insulating part connects the electrode terminal and the packaging bag, and along the first direction, the distance from the first side wall to the insulating part is h2, h1≤0.6h2, which reduces the interference between the third sealing portion and the insulating part, and can reduce the risk of the electrode assembly being crushed during packaging while reducing the generation of bulging in the packaging bag.

[0012] In one or more of the above optional embodiments, the electrode assembly includes a first electrode piece, a separator, and a second electrode piece, the separator being disposed between the first electrode piece and the second electrode piece, the first electrode piece including a first section protruding from the second electrode piece, and the projection of the third sealing portion overlaps with the projection of the first section along a first direction. The third sealing portion reduces bulging, thereby reducing the risk of the first section of the bulge being damaged by extrusion, deformation, or even decarbonization, thereby reducing the risk of short circuiting of the battery cell.

[0013] In one or more of the above optional embodiments, the packaging bag is provided with a first receiving portion and a second receiving portion, and the electrode assembly is provided in the first receiving portion and the second receiving portion.

[0014] In one or more of the above optional embodiments, there is a gap between the third sealing portion and the electrode assembly, which reduces the risk of damage to the main body or the electrode assembly during the process of packaging the third sealing portion.

[0015] In one or more of the above optional embodiments, the sealing portion includes a fourth sealing portion, and the third sealing portion and the fourth sealing portion are arranged along the third direction.

[0016] An embodiment of the present application provides a battery, comprising the battery cell in any one of the above embodiments.

[0017] An embodiment of the present application provides an electrical device, comprising the battery in any one of the above embodiments.

[0018] An embodiment of the present application provides a package for packaging the battery cell in any of the above embodiments, including a first head and a second head. The first head includes a first packaging portion and a first convex portion, the first packaging portion includes a first packaging surface, the first convex portion includes a second packaging surface, and the first packaging surface and the second packaging surface are arranged coplanarly. The second head includes a second packaging portion and a second convex portion, the second packaging portion includes a third packaging surface, the second convex portion includes a fourth packaging surface, and the second packaging surface and the fourth packaging surface are arranged coplanarly. The first packaging surface and the third packaging surface are used to package the second sealing portion, and the second packaging surface and the fourth packaging surface are used to package the third sealing portion.

[0019] In one or more of the above optional embodiments, when observed in a direction perpendicular to the first packaging surface, the first protrusion is provided with a straight edge and an arc edge, and the straight edge connects the arc edge. The arc edge facilitates the first protrusion 420 to be away from the main body during packaging, thereby reducing the risk of damaging the main body.

[0020] In one or more of the above optional embodiments, the first packaging portion includes a first wall, and the first protrusion is provided on the first wall.

[0021] In one or more optional embodiments above, the first packaging portion is provided with a first recess, and the first protrusion is connected to the first recess and is located at the edge of the first wall, which is beneficial to reducing glue overflow.

[0022] In one or more optional embodiments above, the height h3 of the first protrusion protruding from the first wall satisfies 0.5mm≤h3≤15mm. If h3 is less than 0.5mm, the height of the protrusion of the first protrusion is too small, and the length of the third sealing part of the package along the first direction is too small, which is not conducive to reducing the occurrence of bulging of the packaging bag and reducing the risk of damage to the electrode assembly due to extrusion deformation. If h3 is greater than 15mm, the height of the protrusion of the first protrusion is too large, resulting in the length of the third sealing part of the package along the first direction being too long. The longer the distance the third sealing part extends along the first direction, the closer the third sealing part is to the main body, and when the third sealing part is encapsulated, it is easy to cause damage to the main body. The present application sets h3 to 0.5mm≤h3≤15mm, which is conducive to encapsulating the third sealing part, reducing the occurrence of bulging of the packaging bag, reducing the risk of damage to the electrode assembly due to extrusion deformation, resulting in short circuit of the battery cell, and reducing the risk of damage to the main body.

[0023] In one or more of the above optional embodiments, the package includes a first limiting portion and a second limiting portion. The first limiting portion and the second limiting portion are provided at both ends of the lengthwise direction of the first package portion, and the first limiting portion and the second limiting portion protrude from the first package surface. Alternatively, the first limiting portion and the second limiting portion are provided at both ends of the lengthwise direction of the second package portion, and the first limiting portion and the second limiting portion protrude from the third package surface, thereby facilitating reduction of adhesive overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic structural diagram of a battery cell in some embodiments.

[0025] FIG2 is a schematic structural diagram of the battery cell in another state shown in FIG1 .

[0026] FIG3 shows an exploded schematic diagram of a battery cell in some embodiments.

[0027] FIG4 shows a schematic structural diagram of an electrode assembly in some embodiments.

[0028] FIG5 shows schematic structural diagrams of battery cells in other embodiments.

[0029] FIG6 shows a schematic structural diagram of an electrical device in some embodiments.

[0030] FIG. 7 is a schematic structural diagram of a package in some embodiments.

[0031] FIG8 shows a schematic structural diagram of the first head in some embodiments.

[0032] FIG9 shows a schematic structural diagram of the second head in some embodiments.

[0033] FIG10 shows a schematic structural diagram of the first head from another perspective in some embodiments.

[0034] FIG11 shows a schematic structural diagram of the first head from another perspective in some embodiments.

[0035] FIG. 12 is a schematic diagram showing an enlarged structure of the first convex portion in FIG. 10 .

[0036] Description of the main component symbols: Battery cell 100 Packaging bag 10 Main body 11 Top wall 11a First side wall 11b First connecting wall 11c Bottom wall 11d Second connecting wall 11e First curved surface 110 Second curved surface 120 First shell 111 First receiving portion 111a Second shell 112 Second receiving portion 112a First extending edge 113 Second extending edge 114 Sealing portion 12 First sealing portion 121 First sealing edge 121a Second sealing portion 122 Third sealing portion 123 Second sealing edge 123a First sealing area 1231 Second sealing area 1232 Fourth sealing portion 124 Insulator 101 Electrode assembly 20 First pole piece 21 First section 211 Second section 212Separator 22 Second pole piece 23 Electrode terminal 30 Battery 200 Electrical device 300 Package 400 First sealing head 400a Second sealing head 400b First limiting portion 400c Second limiting portion 400d First packaging portion 410 First packaging surface 410a First recess 410b First wall 411 First protrusion 420 Second packaging surface 420a Straight edge 420b Arc edge 420c First arc segment 4201 Second arc segment 4202 Second packaging portion 430 Third packaging surface 430a Second recess 430b Second wall 431 Second protrusion 440 Fourth packaging surface 440a First connecting portion 450 Second connecting portion 460 First direction X Second direction Y Third directionZ

[0037] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0038] The following detailed description is illustrative and non-limiting. It is intended to provide a basic understanding of the present application and is not intended to identify the key or decisive elements of the present application or to limit the scope of protection. As long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any manner.

[0039] When a component is referred to as being “disposed on” another component, it can be directly disposed on the other component or there may be a component intervening therebetween. When a component is referred to as being “connected to” another component, it can be directly connected to the other component or there may be a component intervening therebetween.

[0040] It can be understood that the term "perpendicular" is used to describe the ideal state between two components. In actual production or use, there may be a state between the two components that is approximately perpendicular or equal. For example, combined with numerical descriptions, perpendicular can refer to the angle between two straight lines being in the range of 90°±10°, perpendicular can also refer to the dihedral angle between two planes being in the range of 90°±10°, and perpendicular can also refer to the angle between a straight line and a plane being in the range of 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0041] The terms “vertical,” “horizontal,” “left,” “right,” “top,” “bottom,” “front,” “back,” and similar expressions used herein are for illustrative purposes only and are not intended to limit this application.

[0042] Unless otherwise defined, the term "plurality" herein, when used to describe the number of components, specifically means that the components are two or more.

[0043] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features of the embodiments may be combined with each other.

[0044] 1, 2, and 3, an embodiment of the present application provides a battery cell 100, comprising a packaging bag 10, an electrode assembly 20, and an electrode terminal 30. The electrode assembly 20 is disposed within the packaging bag 10, and the electrode terminal 30 is connected to the electrode assembly 20 and extends from the packaging bag 10.

[0045] In some embodiments, the packaging bag 10 includes a main body 11 and a sealing portion 12. The electrode assembly 20 is disposed on the main body 11. The sealing portion 12 includes a first sealing portion 121, a second sealing portion 122, and a third sealing portion 123. The electrode terminal 30 is connected to the electrode assembly 20 and extends from the first sealing portion 121.

[0046] In some embodiments, the sealing portion 12 includes a second sealing portion 122 and a third sealing portion 123. The second sealing portion 122 is connected to the first sealing portion 121, and the third sealing portion 123 connects the first sealing portion 121 and the second sealing portion 122, and the third sealing portion 123 is located at the intersection of the first sealing portion 121 and the second sealing portion 122.

[0047] In some embodiments, the second sealing portion 122 is bent and connected to the main body 11 , which helps to reduce the space occupied by the battery cell 100 in the first direction X. The first direction X is the width direction of the battery cell 100 .

[0048] When the second sealing portion 122 is bent, the excess space between the electrode assembly 20 and the packaging bag 10 forms a bulge, which squeezes the electrode assembly 20 and easily deforms it, creating a short-circuit risk. This application utilizes the third sealing portion 123 to reduce the bulge in the packaging bag 10, thus minimizing damage to the electrode assembly 20 from squeezing, deformation, and even decarbonization, thereby reducing the risk of short-circuiting the battery cell 100.

[0049] Referring to Figures 1, 2, and 3, in some embodiments, the main body 11 includes a first shell 111 and a second shell 112. The first shell 111 has a first receiving portion 111a, and the second shell 112 has a second receiving portion 112a. The first shell 111 connects to the second shell 112 to form a storage space. The electrode assembly 20 is partially located in the first receiving portion 111a and partially located in the second receiving portion 112a. The periphery of the first shell 111 extends outward to form a first extended edge 113, and the periphery of the second shell 112 extends outward to form a second extended edge 114. After the first shell 111 connects to the second shell 112, the sealing portion 12 refers to the area where the first shell 111 and the second shell 112 overlap and fuse. In this case, the packaging bag 10 can accommodate a thicker electrode assembly 20, which helps improve the energy density of the battery cell 100. The third sealing portion 123 can effectively reduce bulging and decarbonization problems that may occur in thick battery cells 100.

[0050] In some embodiments, the main body 11 includes a top wall 11 a , and the first sealing portion 121 is connected to the top wall 11 a .

[0051] In some embodiments, the main body 11 includes a first side wall 11 b , and the second sealing portion 122 is connected to the first side wall 11 b .

[0052] In some embodiments, along the first direction X, the main body 11 includes two first side walls 11 b , and each first side wall 11 b is connected to a second sealing portion 122 .

[0053] In some embodiments, the second sealing portion 122 is bent and connected to the first side wall 11 b , which helps to reduce the space occupied by the battery cell 100 in the first direction X.

[0054] In some embodiments, the sealing portion 12 includes two third sealing portions 123 and two second sealing portions 122, wherein one of the second sealing portions 122 and one of the third sealing portions 123 are arranged along the first direction X, and the third sealing portion 123 connects the first sealing portion 121 and the second sealing portion 122. Another third sealing portion 123 and another second sealing portion 122 are arranged along the first direction X, and another third sealing portion 123 connects the first sealing portion 121 and another second sealing portion 122.

[0055] In some embodiments, the third sealing portion 123 is spaced apart from the electrode assembly 20 , and during the process of packaging the third sealing portion 123 , the risk of the electrode assembly 20 being crushed during packaging is reduced.

[0056] In some embodiments, the first sealing portion 121 includes a first sealing edge 121a, and the third sealing portion 123 includes a second sealing edge 123a. The first sealing edge 121a intersects with the second sealing edge 123a. At least a portion of the second sealing edge 123a is set as an arc-shaped edge away from the electrode assembly 20, which is beneficial for the third sealing portion 123 to be away from the main body 11, reducing the risk of crushing the electrode assembly 20 during packaging, and further reducing the risk of damage to the main body 11 in the process of packaging the third sealing portion 123.

[0057] In some embodiments, at least a portion of the second sealing edge 123 a is configured as a straight edge, which increases the sealing area of ​​the third sealing portion 123 , thereby reducing bulging of the packaging bag 10 and lowering the risk of short circuiting of the battery cell 100 .

[0058] In some embodiments, the main body 11 includes a first connecting wall 11 c connecting the top wall 11 a and the first side wall 11 b .

[0059] In some embodiments, the first connecting wall 11 c has a first arcuate surface 110 protruding toward the third sealing portion 123 , and the first arcuate surface 110 is spaced apart from the second sealing edge 123 a .

[0060] In some embodiments, a portion of the third sealing portion 123 overlaps with the first sealing portion 121 , which helps to increase the sealing strength and reduce the risk of leakage of the battery cell 100 .

[0061] In some embodiments, the third sealing portion 123 includes a first sealing area 1231 and a second sealing area 1232 , wherein the first sealing area 1231 connects the first sealing portion 121 and the second sealing portion 122 , and the second sealing area 1232 overlaps a portion of the first sealing portion 121 .

[0062] In some embodiments, along the first direction X, the length h1 of the third sealing portion 123 satisfies 0.5mm≤h1≤15mm. If h1 is less than 0.5mm, the length of the third sealing portion 123 along the first direction X is too short, which is not conducive to reducing the occurrence of bulging of the packaging bag 10 and reducing the risk of the electrode assembly 20 being damaged by extrusion and deformation. If h1 is greater than 15mm, the length of the third sealing portion 123 along the first direction X is too long. The longer the distance the third sealing portion 123 extends along the first direction X, the closer the third sealing portion 123 is to the main body 11. When encapsulating the third sealing portion 123, it is easy to cause damage to the main body 11 or the electrode assembly 20. The present application sets h1 to 0.5mm≤h1≤15mm, which is conducive to reducing the occurrence of bulging of the packaging bag 10, reducing the risk of the electrode assembly 20 being damaged by extrusion and deformation, resulting in a short circuit of the battery cell 100, and reducing the risk of damage to the main body 11.

[0063] Optionally, h1 can be any one of 0.5mm, 1mm, 1.5mm, 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, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, and 15mm.

[0064] In some embodiments, 0.5 mm ≤ h1 ≤ 5 mm, which is beneficial to reducing the occurrence of bulging in the packaging bag 10 , reducing the risk of the electrode assembly 20 being squeezed and deformed, causing damage to the battery cell 100 , and further reducing the risk of damage to the main body 11 .

[0065] In some embodiments, 1mm≤h1≤3mm, which is further beneficial to reducing the occurrence of bulging in the packaging bag 10, reducing the risk of the electrode assembly 20 being squeezed and deformed, causing damage to the battery cell 100, and further reducing the risk of damage to the main body 11.

[0066] In some embodiments, the battery cell 100 includes an insulating member 101, which covers the electrode terminal 30 along the second direction Y. The insulating member 101 is connected to the packaging bag 10 to insulate the electrode terminal 30 from the packaging bag 10. Optionally, the insulating member 101 includes insulating glue.

[0067] In some embodiments, along the second direction Y, the width of the insulating member 101 in the first direction X is greater than the width of the electrode terminal 30 . The first direction X is perpendicular to the second direction Y, and the second direction Y is the thickness direction of the battery cell 100 .

[0068] In some embodiments, along the first direction X, the distance from the first side wall 11b to the insulating member 101 is h2, h1≤0.6h2, which reduces the interference between the third sealing portion 123 and the insulating member 101, and can reduce the generation of bulging of the packaging bag 10 while reducing the risk of the electrode assembly 20 being crushed during packaging.

[0069] 1 and 4 , in some embodiments, the electrode assembly 20 includes a first electrode piece 21, a separator 22, and a second electrode piece 23, wherein the separator 22 is disposed between the first electrode piece 21 and the second electrode piece 23. Optionally, the first electrode piece 21, the separator 22, and the second electrode piece 23 are wound to form the electrode assembly 20.

[0070] In some embodiments, the first pole piece 21 includes a first section 211 that protrudes from the second pole piece 23. Along the first direction X, the projection of the third sealing portion 123 overlaps with the projection of the first section 211. The third sealing portion 123 reduces bulging, thereby reducing the risk of the bulged first section 211 being squeezed, deformed, damaged, or even decarbonized, thereby reducing the risk of short circuiting in the battery cell 100.

[0071] 4 and 5 , the sealing portion 12 includes a fourth sealing portion 124 . The third sealing portion 123 and the fourth sealing portion 124 are arranged along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0072] In some embodiments, the main body 11 includes a bottom wall 11 d , the top wall 11 a and the bottom wall 11 d are arranged along the third direction Z, and the bottom wall 11 d is connected to the first side wall 11 b .

[0073] In some embodiments, the fourth sealing portion 124 is spaced apart from the electrode assembly 20 , thereby reducing the risk of damage to the electrode assembly 20 during the process of encapsulating the fourth sealing portion 124 .

[0074] In some embodiments, the first pole piece 21 includes a second section 212 that protrudes from the second pole piece 23 along the third direction Z. Along the first direction X, the projection of the fourth sealing portion 124 overlaps with the projection of the second section 212. The fourth sealing portion 124 reduces bulging, thereby reducing the risk of the bulged second section 212 being squeezed, deformed, damaged, or even decarbonized, thereby reducing the risk of short circuiting in the battery cell 100.

[0075] In some embodiments, the main body 11 includes a second connecting wall 11e, which connects the bottom wall 11d and the first side wall 11b. The fourth sealing portion 124 includes a third sealing edge 124a, at least a portion of which is disposed as an arcuate edge away from the main body 11. The second connecting wall 11e has a protruding second arcuate surface 120, and the third sealing edge 124a is spaced apart from the second arcuate surface 120, further reducing the risk of damage to the main body 11.

[0076] In some embodiments, at least a portion of the third sealing edge 124 a is configured as a straight edge, which increases the sealing area of ​​the fourth sealing portion 124 , thereby reducing bulging of the packaging bag 10 and lowering the risk of short circuiting of the battery cell 100 .

[0077] In some embodiments, the sealing portion 12 includes a fifth sealing portion (not shown), the fifth sealing portion is connected to the bottom wall 11 d , and the fourth sealing portion 124 connects the second sealing portion 122 and the fifth sealing portion.

[0078] Please refer to FIG. 6 , the present application also provides a battery 200 using the above-mentioned battery cell 100 .

[0079] 6 , the present application further provides an electrical device 300 using the battery 200. In one embodiment, the electrical device 300 of the present application may be, but is not limited to, electronic equipment, drones, backup power supplies, electric vehicles, electric motorcycles, electric power-assisted bicycles, power tools, and the like.

[0080] Referring to Figures 7, 8, and 9, one embodiment of the present application provides a packaging member 400 comprising a first sealing head 400a and a second sealing head 400b. The first sealing head 400a is connected to an external movable member, while the second sealing head 400b is fixed to a workbench. When packaging a battery cell 100, the external movable member moves the first sealing head 400a toward the second sealing head 400b, heat-sealing the second sealing portion 122 and the third sealing portion 123 between the first sealing head 400a and the second sealing head 400b.

[0081] In some embodiments, the first sealing head 400a includes a first packaging portion 410 and a first protrusion 420. The first packaging portion 410 includes a first packaging surface 410a, and the first protrusion 420 includes a second packaging surface 420a. The first packaging surface 410a and the second packaging surface 420a are coplanar.

[0082] In some embodiments, the second head 400b includes a second packaging portion 430 and a second protrusion 440. The second packaging portion 430 includes a third packaging surface 430a, and the second protrusion 440 includes a fourth packaging surface 440a. The third packaging surface 430a and the fourth packaging surface 440a are coplanar.

[0083] In some embodiments, the first packaging surface 410 a and the third packaging surface 430 a are used to encapsulate the second sealing portion 122 , and the second packaging surface 420 a and the fourth packaging surface 440 a are used to encapsulate the third sealing portion 123 .

[0084] In some embodiments, the first sealing head 400a includes a first connecting portion 450 , the first packaging portion 410 is connected to the first connecting portion 450 , and the first connecting portion 450 is connected to an external moving part.

[0085] Optionally, the first packaging portion 410 and the first connecting portion 450 are integrally formed.

[0086] Optionally, the first packaging portion 410 and the first connecting portion 450 are fixedly connected, for example, by fasteners such as bolts.

[0087] Optionally, the first packaging portion 410 and the first connecting portion 450 are connected by welding.

[0088] In some embodiments, the second sealing head 400 b includes a second connecting portion 460 , the second packaging portion 430 is connected to the second connecting portion 460 , and the second connecting portion 460 is fixedly connected to the workbench to fix the second packaging portion 430 .

[0089] Optionally, the second packaging portion 430 and the second connecting portion 460 are integrally formed.

[0090] Optionally, the second packaging portion 430 and the second connecting portion 460 are fixedly connected, for example, by fasteners such as bolts.

[0091] Optionally, the second packaging portion 430 and the second connecting portion 460 are connected by welding.

[0092] Please refer to Figure 9. In some embodiments, the package 400 includes a first limiting portion 400c and a second limiting portion 400d. The first limiting portion 400c and the second limiting portion 400d are arranged at both ends of the length direction of the first packaging portion 410. The first limiting portion 400c and the second limiting portion 400d protrude from the first packaging surface 410a, which is beneficial to the thickness of the second sealing portion 122 and the third sealing portion 123, and is beneficial to reducing glue overflow.

[0093] In some embodiments, the first limiting portion 400c and the second limiting portion 400d are arranged at both ends of the second packaging portion 430 in the length direction. The first limiting portion 400c and the second limiting portion 400d protrude from the third packaging surface 430a, which is beneficial to the thickness of the second sealing portion 122 and the third sealing portion 123, and is beneficial to reducing glue overflow.

[0094] In some embodiments, the first limiting portion 400 c and the second limiting portion 400 d are disposed on the first packaging portion 410 , and the first limiting portion 400 c and the second limiting portion 400 d are also disposed on the second packaging portion 430 .

[0095] Referring to FIG. 7 , FIG. 8 , and FIG. 9 , in some embodiments, the first packaging portion 410 includes a first wall 411 , and the first protrusion 420 is disposed on the first wall 411 .

[0096] In some embodiments, the first packaging portion 410 has a first concave portion 410b, and the first convex portion 420 is connected to the first concave portion 410b and is located at the edge of the first wall 411. During packaging, the first concave portion 410b can accommodate part of the colloid to reduce glue overflow.

[0097] In some embodiments, the second packaging portion 430 includes a second wall 431 , and the second protrusion 440 is disposed on the second wall 431 .

[0098] In some embodiments, the second packaging portion 430 has a second recess 430b, and the second protrusion 440 is connected to the second recess 430b and is located at the edge of the second wall 431. During packaging, the second recess 430b can accommodate part of the glue to reduce glue overflow.

[0099] Referring to FIG. 10 to FIG. 12 , in some embodiments, when viewed along a direction perpendicular to the first packaging surface 410 a , the first protrusion 420 has a straight edge 420 b and a curved edge 420 c , and the straight edge 420 b connects the curved edge 420 c .

[0100] In some embodiments, the arc edge 420c includes a first arc segment 4201 , which is protruded toward the first packaging portion 410 , thereby facilitating the first protrusion 420 to be away from the main body 11 during packaging, thereby reducing the risk of damaging the main body 11 .

[0101] In some embodiments, the arc edge 420c includes a second arc segment 4202, and the first arc segment 4201 is protruded away from the first packaging portion 410, reducing the sharp structure of the first protrusion 420 and reducing the risk of damaging the main body 11 during packaging.

[0102] In some embodiments, the height h3 of the first protrusion 420 protruding from the first wall 411 satisfies 0.5 mm ≤ h3 ≤ 15 mm. If h3 is less than 0.5 mm, the height of the first protrusion 420 is too small, and the length of the encapsulated third sealing portion 123 along the first direction X is too short, which is not conducive to reducing the occurrence of bulging on the packaging bag 10 and is not conducive to reducing the risk of damage to the electrode assembly 20 due to compression deformation. If h3 is greater than 15 mm, the height of the first protrusion 420 is too large, resulting in the encapsulated third sealing portion 123 being too long along the first direction X. The longer the third sealing portion 123 extends along the first direction X, the closer the third sealing portion 123 is to the main body 11, which can easily cause damage to the main body 11 when the third sealing portion 123 is encapsulated. The present application sets h3 to 0.5 mm ≤ h3 ≤ 15 mm, which is conducive to encapsulating the third sealing portion 123, reducing the occurrence of bulging on the packaging bag 10, reducing the risk of damage to the electrode assembly 20 due to compression deformation, resulting in short circuits in the battery cells 100, and reducing the risk of damage to the main body 11.

[0103] Optionally, h3 can be any one of 0.5mm, 1mm, 1.5mm, 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, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, and 15mm.

[0104] In some embodiments, 0.5mm≤h3≤5mm is conducive to encapsulating the third sealing portion 123, reducing the generation of bulging in the packaging bag 10, reducing the risk of the electrode assembly 20 being squeezed and deformed to cause damage, resulting in a short circuit in the battery cell 100, and further reducing the risk of damage to the main body 11.

[0105] In some embodiments, 1mm≤h3≤3mm is further conducive to encapsulating the third sealing portion 123, reducing the generation of bulging in the packaging bag 10, reducing the risk of the electrode assembly 20 being squeezed and deformed to cause damage, resulting in a short circuit in the battery cell 100, and further reducing the risk of damage to the main body 11.

[0106] In some embodiments, the structure of the second protrusion 440 is the same as that of the first protrusion 420 .

[0107] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present application and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments fall within the scope disclosed in the present application.

Claims

1. A battery cell comprising a packaging bag, an electrode assembly and an electrode terminal, characterized in that: The packaging bag includes a main body and a sealing portion, the electrode assembly is provided in the main body, the sealing portion includes a first sealing portion, and the electrode terminal is connected to the electrode assembly and extends from the first sealing portion; The sealing portion also includes a second sealing portion and a third sealing portion, the second sealing portion is connected to the first sealing portion, the second sealing portion is bent and connected to the main body portion, the third sealing portion connects the first sealing portion and the second sealing portion, and the third sealing portion is located in the intersection area of ​​the first sealing portion and the second sealing portion.

2. The battery cell according to claim 1, wherein: The first sealing portion includes a first sealing edge, the third sealing portion includes a second sealing edge, the first sealing edge intersects with the second sealing edge, and at least a portion of the second sealing edge is configured as a straight edge or an arcuate edge away from the electrode assembly.

3. The battery cell according to claim 1, wherein: A portion of the third sealing portion overlaps with the first sealing portion.

4. The battery cell according to any one of claims 1 to 3, characterized in that: Along a first direction, a length of the third sealing portion is h1, satisfying 0.5 mm ≤ h1 ≤ 15 mm, and the first direction is a width direction of the battery cell.

5. The battery cell according to claim 4, wherein: h1 satisfies 0.5mm≤h1≤5mm.

6. The battery cell according to claim 4, wherein: h1 satisfies 1mm≤h1≤3mm.

7. The battery cell according to claim 4, wherein: The main body includes a first side wall, the second sealing portion is connected to the first side wall, the battery cell includes an insulating member, the insulating member connects the electrode terminal and the packaging bag, and along the first direction, the distance from the first side wall to the insulating member is h2, h1≤0.6h2.

8. The battery cell according to claim 4, wherein: The electrode assembly includes a first electrode piece, an isolation membrane and a second electrode piece. The isolation membrane is arranged between the first electrode piece and the second electrode piece. The first electrode piece includes a first section protruding from the second electrode piece. Along the first direction, the projection of the third sealing portion overlaps with the projection of the first section.

9. The battery cell according to any one of claims 1 to 3, characterized in that: The packaging bag is provided with a first receiving portion and a second receiving portion, and the electrode assembly is provided in the first receiving portion and the second receiving portion.

10. The battery cell according to any one of claims 1 to 3, characterized in that: A gap is defined between the third sealing portion and the electrode assembly.

11. The battery cell according to any one of claims 1 to 3, characterized in that: The sealing portion includes a fourth sealing portion, and the third sealing portion and the fourth sealing portion are arranged along a third direction.

12. A battery, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 11.

13. An electrical device, characterized in that: Comprising the battery of claim 12.

14. A package for packaging the battery cell according to any one of claims 1 to 11, characterized in that: include: a first sealing head, the first sealing head comprising a first packaging portion and a first convex portion, the first packaging portion comprising a first packaging surface, the first convex portion comprising a second packaging surface, the first packaging surface and the second packaging surface being coplanar; a second sealing head, the second sealing head comprising a second packaging portion and a second convex portion, the second packaging portion comprising a third packaging surface, the second convex portion comprising a fourth packaging surface, the second packaging surface and the fourth packaging surface being coplanar; The first packaging surface and the third packaging surface are used to package the second sealing portion, and the second packaging surface and the fourth packaging surface are used to package the third sealing portion.

15. The package according to claim 14, wherein When viewed in a direction perpendicular to the first packaging surface, the first protrusion is provided with a straight edge and an arc edge, and the straight edge connects the arc edge.

16. The package according to claim 14, wherein The first packaging portion includes a first wall, and the first protrusion is provided on the first wall.

17. The package according to claim 16, wherein: The first packaging portion is provided with a first concave portion, and the first convex portion is connected to the first concave portion and is located at an edge of the first wall.

18. The package according to claim 16, wherein A height h3 of the first protrusion protruding from the first wall satisfies 0.5 mm ≤ h3 ≤ 15 mm.

19. The package according to any one of claims 14 to 18, wherein: The packaging component includes a first limiting portion and a second limiting portion; The first limiting portion and the second limiting portion are provided at both ends of the first packaging portion in a length direction, and the first limiting portion and the second limiting portion protrude from the first packaging surface; And or, the first limiting portion and the second limiting portion are provided at both ends of the second packaging portion in the length direction, and the first limiting portion and the second limiting portion protrude from the third packaging surface.

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