Soft package battery and electric equipment

Abstract

The utility model discloses a soft package battery and electric equipment. The soft package battery comprises a soft package shell and a battery cell, the soft package shell comprises a packaging main body and a side sealing edge, the battery cell is located in the packaging main body, the packaging main body comprises a side wall, a bottom wall and a top wall of the soft package battery, the side wall and the bottom wall are smoothly connected through a smooth arc-shaped wall, and the side sealing edge comprises a first rectangular sealing area and a first corner sealing area; the first corner sealing area is located between the first rectangular sealing area and the smooth arc-shaped wall, the side sealing edge comprises a first end face closer to the bottom wall, the first end face extends to the first corner sealing area, and the first end face does not protrude out of the bottom wall in the direction from the top wall to the bottom wall. The part, protruding out of the bottom wall of the packaging main body, of the side sealing edge is cut or folded, so that the first end face of the side sealing edge does not protrude out of the bottom wall of the packaging main body, the length of the soft package battery is reduced, and the energy density of the soft package battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a soft-pack battery and an electrical device. Background Technology

[0002] In existing soft-pack lithium-ion battery manufacturing technology, due to the extensibility of aluminum-plastic film, after side sealing, the two sealing edges will bulge out at the bottom along the length of the soft-pack battery, forming a bottom protrusion. Since the sealing area of ​​the sealing structure in the existing technology is usually a first rectangular sealing area extending along the length of the sealing structure itself, and there is also an unsealed area between the sealing area and the packaging body, it is not possible to directly cut off the bottom protrusion. Based on this, some technologies fold the bottom protrusion towards the side sealing edge. However, since the folding crease will be located in the unsealed area, the unsealed area is easily damaged at this point, reducing the sealing performance of the soft-pack battery. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pouch battery that can achieve high sealing performance while maintaining high energy density.

[0004] This application also provides an electrical device including the aforementioned pouch battery.

[0005] The soft-pack battery according to the first embodiment of the present invention includes: a soft-pack casing and a battery cell.

[0006] The soft-pack battery casing includes a packaging body and side seals. The packaging body has a receiving cavity. The packaging body includes two side walls in the width direction of the soft-pack battery, and a bottom wall and a top wall in the length direction of the soft-pack battery. The side seals are connected to the side walls. A smooth arc-shaped wall curved away from the receiving cavity is provided between the side walls and the bottom wall. The side walls and the bottom wall are smoothly connected via the smooth arc-shaped wall. The side seals include a first rectangular sealing area and a first corner sealing area. The first rectangular sealing area extends along the length direction of the side seals. The first corner sealing area is located between the first rectangular sealing area and the smooth arc-shaped wall. The side seals include a first end face closer to the bottom wall. The first end face extends to the first corner sealing area. In the direction from the top wall to the bottom wall, the first end face does not protrude from the bottom wall. The battery cell includes a cell body and tabs. The cell body is located in the receiving cavity. The tabs are connected to the cell body and extend from the top wall.

[0007] The soft-pack battery according to the embodiments of the present invention has at least the following beneficial effects:

[0008] In this embodiment, a first corner sealing area is also provided between the first rectangular sealing area and the smooth arc-shaped wall, thereby increasing the sealing width of the soft-pack outer shell at the bottom corner (the position of the side seal corresponding to the smooth arc-shaped wall). Therefore, by cutting or folding the portion of the side seal protruding from the bottom wall (the bottom protrusion), the first end face of the side seal does not protrude from the bottom wall of the encapsulation body, and the sealing effect at the cut or folded point is guaranteed. Thus, in this embodiment, by providing a first corner sealing area between the first rectangular sealing area and the smooth arc-shaped wall, the portion of the side seal protruding from the bottom wall of the encapsulation body can be cut or folded while ensuring the airtightness of the soft-pack battery, so that the first end face of the side seal does not protrude from the bottom wall of the encapsulation body, thereby reducing the length of the soft-pack battery and increasing its energy density.

[0009] According to some embodiments of this application, in the width direction of the side seal, the first corner sealing area has a first boundary close to the smooth arc-shaped wall, the first boundary being an arc curve, and the first rectangular sealing area has a second boundary close to the side wall, the first boundary and the second boundary being smoothly connected.

[0010] According to some embodiments of this application, the side sealing edge includes a second end face facing away from the encapsulation body along its own width direction, and the side sealing edge also includes a first cutting surface, one end of the first cutting surface is connected to the second end face and is inclined relative to the second end face, and the first cutting surface extends to the edge of the first corner being the sealing area, the soft package shell is made of an encapsulation film, the encapsulation film includes a metal foil layer, and the metal foil layer is exposed from the first cutting surface.

[0011] According to some embodiments of this application, the side sealing edge includes a second end face facing away from the encapsulation body along its own width direction, and two third end faces facing away from each other along its own thickness direction. The edge where the third end face intersects with the second end face is a first edge. The side sealing edge includes a main body portion and a first folded portion. The first folded portion is folded towards the main body portion and forms a first crease on the third end face. One end of the first crease is located at the first edge, and the other end is located at the edge of the first corner sealing area. Along the direction from the bottom wall to the top wall, the distance between the first crease and the first edge gradually decreases.

[0012] According to some embodiments of this application, the soft-pack shell further includes a top sealing edge, the side sealing edge includes a top corner, the top sealing edge protrudes from the top wall along the direction from the bottom wall to the top wall, the top corner is connected to the top sealing edge, the side sealing edge and the top sealing edge are both folded towards the encapsulation body, and the top corner forms a top protrusion protruding from the top wall.

[0013] According to some embodiments of this application, the top sealing edge includes a second rectangular sealing area, which extends along the length direction of the top sealing edge and connects with the first rectangular sealing area. The top corner also includes a second corner sealing area. In the width direction of the side sealing edge, the second corner seal is located on the side of the first rectangular sealing area closer to the packaging body. In the width direction of the top sealing edge, the second corner seal is located on the side of the second rectangular sealing area closer to the packaging body.

[0014] According to some embodiments of this application, the side sealing edge includes a second end face facing away from the encapsulation body along its own width direction, a fourth end face facing away from the first end face, and two third end faces facing away from each other along its own thickness direction. The edge of the third end face intersecting with the second end face is the first edge, and the edge of the third end face intersecting with the fourth end face is the second edge.

[0015] The top corner is folded to form the top protrusion, and a second crease and a third crease are formed on the third end face. One end of the second crease is located at the first edge, and the other end is located at the second edge.

[0016] The third crease intersects with the second crease, one end of the third crease is spaced apart from both the first edge and the second edge, and the other end is located at the edge of the third end face.

[0017] According to some embodiments of this application, the angle between the second crease and the second end face is α, α≤135°, and the projection of the second crease along the width direction of the soft-pack battery is located outside the sidewall.

[0018] According to some embodiments of this application, the two parts on both sides of the second crease of the side seal are defined as the main body and the second folded part, respectively. The main body is connected to the side wall, the top corner includes the second folded part, the edge connecting the fourth end face and the second end face is defined as the apex angle, the second folded part includes the apex angle, and the point in the main body that is symmetrical to the apex angle about the second crease is located at the second corner as the sealing area.

[0019] The electrical device according to the second aspect of this application includes the pouch battery of the first aspect embodiment.

[0020] The electrical equipment in this embodiment has at least the following beneficial effects;

[0021] The pouch battery using the first aspect embodiment further includes a first corner sealing area between the first rectangular sealing area and the smooth arc-shaped wall, thereby increasing the sealing width of the pouch casing at the bottom corner (the position of the side seal corresponding to the smooth arc-shaped wall). Therefore, by cutting or folding the portion of the side seal protruding from the bottom wall (the bottom protrusion), the first end face of the side seal can be kept from protruding from the bottom wall of the encapsulation body, ensuring a sealing effect at the cut or folded points. Thus, in this embodiment, by providing a first corner sealing area between the first rectangular sealing area and the smooth arc-shaped wall, the portion of the side seal protruding from the bottom wall of the encapsulation body can be cut or folded while ensuring the sealing performance of the pouch battery, so that the first end face of the side seal does not protrude from the bottom wall of the encapsulation body. This reduces the length of the pouch battery, increases its energy density, and consequently improves the battery life of the device in this embodiment.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of a common pouch battery in the prior art;

[0025] Figure 2 for Figure 1 A magnified view of area A in the middle;

[0026] Figure 3 This is a schematic diagram of the structure of the first type of soft-pack battery according to the first aspect of this utility model;

[0027] Figure 4 for Figure 3 A magnified view of area B in the middle;

[0028] Figure 5 This is a partially enlarged schematic diagram of the second type of soft-pack battery according to the first aspect of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of a third type of soft-pack battery according to the first aspect of this utility model;

[0030] Figure 7 for Figure 6 A magnified view of area C in the middle;

[0031] Figure 8 This is a schematic diagram of the structure of the fourth type of soft-pack battery according to the first aspect of this utility model;

[0032] Figure 9 for Figure 8 A magnified view of region D in the middle;

[0033] Figure 10 This is a schematic diagram of the structure of the fifth type of soft-pack battery according to the first aspect of this utility model;

[0034] Figure 11 for Figure 10 A magnified view of region E in the middle;

[0035] Figure 12 for Figure 10 A schematic diagram of the unfolded side and top seals of a soft-pack battery.

[0036] Figure 13 for Figure 12 A magnified view of area F in the middle;

[0037] Figure 14 This is a schematic diagram of the structure of the sixth type of soft-pack battery according to the first aspect of this utility model;

[0038] Figure 15 for Figure 14 A magnified view of the G region;

[0039] Figure 16 for Figure 14 A schematic diagram of the unfolded side and top seals of a soft-pack battery.

[0040] Figure 17 for Figure 16 A magnified view of region H in the middle.

[0041] Figure label:

[0042] Bottom protrusion 1000; Unsealed area 2000;

[0043] The package includes a soft outer shell 100, a main body 110, a side wall 111, a bottom wall 112, a top wall 113, a smooth arc-shaped wall 114, a side sealing edge 120, a bottom corner 1201, a top corner 1202, a main body 1203, a first folded portion 1204, a second folded portion 1205, a first rectangular sealing area 121, a first boundary 1221, a first corner sealing area 122, a second boundary 1211, a first end face 123, a second end face 124, a first cutting surface 125, a third end face 126, a first edge 1261, a second edge 1262, a first crease 1263, a second crease 1264, a third crease 1265, a fourth end face 127, a second cutting surface 128, a top sealing edge 130, a second rectangular sealing area 131, a second corner sealing area 140, a top protrusion 150, and a top corner 160.

[0044] Battery cell 200. Detailed Implementation

[0045] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0046] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0048] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0049] Reference Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a common pouch battery in the prior art. Figure 2 for Figure 1 In the enlarged view of area A, in existing soft-pack lithium-ion battery manufacturing technology, due to the extensibility of the aluminum-plastic film, after side sealing, the two sealing edges protrude along the length of the soft-pack battery at the bottom, forming a bottom protrusion 1000. Since the sealing area of ​​the existing sealing structure is typically a rectangular seal extending along the length of the sealing structure itself, and there is an unsealed area 2000 between the sealing area and the packaging body, the bottom protrusion 1000 cannot be directly cut off. Based on this, some technologies fold the bottom protrusion towards the side sealing edge. However, since the crease formed by the fold is located in the unsealed area, the unsealed area is easily damaged at that point, reducing the airtightness of the soft-pack battery.

[0050] In view of the above background, the first aspect of this utility model proposes a pouch battery that can achieve high energy density while maintaining high sealing performance. It should be noted that, for ease of explanation, Figures 1 to 17 The length direction refers to the length of the pouch cell, the width direction refers to the width of the pouch cell, the thickness direction refers to the thickness of the pouch cell, the width direction of the side seal corresponds to the width direction of the pouch cell when the side seal is not folded towards the main body, and the length direction of the side seal corresponds to the length direction of the pouch cell. Furthermore, to clearly illustrate the structure of the pouch cell, Figures 1 to 9 The side sealing edge 120 and top sealing edge 130 are both folded towards the encapsulation body 110, and cannot be interpreted as the final form of the actual product.

[0051] Reference Figures 3 to 5 , Figure 3 This is a schematic diagram of the structure of the first type of soft-pack battery according to the first aspect of this utility model. Figure 4 for Figure 3 A magnified view of area B in the middle. Figure 5 This is a partially enlarged schematic diagram of a second type of soft-pack battery according to the first aspect of this utility model. The soft-pack battery of this embodiment includes a soft-pack shell 100 and a battery cell 200. Specifically, the soft-pack shell 100 is made of a flexible film such as aluminum-plastic film or steel-plastic film. The soft-pack shell 100 includes an encapsulation body 110 and a side sealing edge 120. The encapsulation body 110 has a receiving cavity. The encapsulation body 110 includes two side walls 111 in the width direction of the soft-pack battery, and a bottom wall 112 and a top wall 113 in the length direction of the soft-pack battery. The side sealing edge 120 is connected to the side walls 111. A smooth arc-shaped wall 114 is provided between the side walls 111 and the bottom wall 112, which is curved away from the receiving cavity. The side walls 111 and the bottom wall 112 are smoothly connected via the smooth arc-shaped wall 114. The side seal 120 includes a first rectangular sealing area 121 and a first corner sealing area 122. The first rectangular sealing area 121 extends along the length of the side seal 120, and the first corner sealing area 122 is located between the first rectangular sealing area 121 and the smooth arc-shaped wall 114. The side seal 120 includes a first end face 123 closer to the bottom wall 112, which extends to the first corner sealing area 122. Along the direction from the top wall 113 to the bottom wall 112, the first end face 123 does not protrude from the bottom wall 112. For example, the first end face 123 is flush with the bottom wall 112, or the first end face 123 is located between the bottom wall 112 and the top wall 113, for example, by trimming the portion of the side seal 120 that protrudes from the bottom wall 112 (e.g., ...). Figure 4 (as shown) or folded (as shown) Figure 5The length of the pouch battery can be reduced as long as the first end face 123 does not protrude from the bottom wall 112 and occupy additional space. The cell 200 is, for example, a laminated cell 200 or a wound cell 200. The cell 200 is located in the receiving cavity, and the tabs are connected to the cell 200 and extend from the top wall 113.

[0052] Specifically, in this embodiment, a first corner sealing area 122 is also provided between the first rectangular sealing area 121 and the smooth arc-shaped wall 114, thereby increasing the sealing width of the soft-pack outer shell 100 at the bottom corner 1201 (corresponding to the position where the side wall 111 and the bottom wall 112 are connected), and thus increasing the sealing width of the soft-pack outer shell 100 at the bottom corner 1201 (the position where the side sealing edge 120 corresponds to the smooth arc-shaped wall 114). (Sealing width: the width of the area where the encapsulation film of the soft-pack battery is tightly bonded together by heat sealing, ultrasonic sealing or other encapsulation technologies). Therefore, the sealing performance of the sealing edge structure can be guaranteed by cutting or folding the portion of the side sealing edge 120 that protrudes from the bottom wall 112 to form the first end face 123. Specifically, taking cutting as an example, since the two layers of encapsulation film (such as aluminum-plastic film) at the first corner sealing area 122 are fused together by a PP layer, the first end face 123 extending to the first corner sealing area 122 can still ensure the sealing effect at the first end face 123, thereby preventing leakage of the soft-pack battery. Furthermore, taking folding as an example, the first end face 123 extends to the first corner sealing area 122, that is, the crease formed by folding (such as the first crease 1263 in the following embodiment) is located in the first corner sealing area 122. Since the two layers of encapsulation film in the first corner sealing area 122 are bonded together, the side sealing edge 120 has higher strength at this location, thereby reducing the risk of breakage and improving the sealing performance of the soft-pack battery. Therefore, in this embodiment, by having a first corner sealing area 122 between the first rectangular sealing area 121 and the smooth arc-shaped wall 114, the portion of the side sealing edge 120 that protrudes from the bottom wall 112 (bottom protrusion 1000) can be cut or folded so that the first end face 123 of the side sealing edge 120 does not protrude from the bottom wall 112 of the encapsulation body 110, thereby enabling the soft-pack battery of this embodiment to have a higher energy density while ensuring the sealing effect.

[0053] Furthermore, it should be noted that in this embodiment, the side wall 111 and the bottom wall 112 are smoothly connected by a smooth arc-shaped wall 114. That is, there is no groove at the connection between the side wall 111 and the bottom wall 112, so there is no need to form a protrusion inside the receiving cavity, and thus it does not occupy the internal space of the receiving cavity of the encapsulation body 110. Therefore, in this embodiment, the setting of the first corner sealing area 122 does not reduce the energy density of the soft-pack battery, and further makes the soft-pack battery of this embodiment have a higher energy density.

[0054] Reference Figure 4In some embodiments, in the width direction of the side seal 120, the first corner sealing area 122 has a first boundary 1221 near the smooth arc-shaped wall 114, the first boundary 1221 being an arc curve, and the first rectangular sealing area 121 has a second boundary 1211 near the side wall 111, the first boundary 1221 and the second boundary 1211 being smoothly connected. That is, the first corner sealing area 122 and the first rectangular sealing area 121 are smoothly connected, and the first boundary 1221 is an arc curve. In this example, the setting of the first corner sealing area 122 will not form a sharp sealing corner inside the side seal 120, thereby improving the strength of the side seal 120 and further reducing the risk of leakage of the soft-pack battery.

[0055] Reference Figure 6 and Figure 7 ,to Figure 9 , Figure 6 This is a schematic diagram of the structure of the third type of soft-pack battery according to the first aspect of this utility model. Figure 7 for Figure 6 An enlarged view of region C. In some embodiments, the side seal 120 includes a second end face 124 facing away from the encapsulation body 110 along its own width direction. The side seal 120 also includes a first cut surface 125, one end of which is connected to the first end face 123, and the other end is connected to the second end face 124. Along the direction from the bottom wall 112 to the top wall 113, the distance between the first cut surface 125 and the second end face 124 gradually decreases, and the first cut surface 125 extends to the edge where the first corner is the sealing area 122. The soft-pack shell 100 is made of an encapsulation film, which includes a metal foil layer exposed from the first cut surface 125. That is, the first cut surface 125 is formed by chamfering the side seal 120. The first cut surface 125 is, for example, an arcuate surface or a flat surface. Thus, the sharp corner (e.g., a 90° sharp corner) at the junction of the first end face 123 and the second end face 124 can be removed while removing the bottom protrusion 1000. Therefore, the pouch battery of this embodiment, while increasing the energy density, also reduces the risk of the encapsulation body 110 being punctured, further reducing the risk of leakage. Furthermore, when the pouch battery of this embodiment is used in electrical equipment, it reduces the risk of punctures to other external components or wires, thereby reducing the risk of short circuits and improving the safety of the electrical equipment.

[0056] Reference Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the structure of the fourth type of soft-pack battery according to the first aspect of this utility model. Figure 9 for Figure 8An enlarged view of region D. In some embodiments, the side seal 120 includes a second end face 124 facing away from the encapsulation body 110 along its width direction, and two third end faces 126 facing away from each other along its thickness direction. The edge where the third end face 126 intersects with the second end face 124 is a first edge 1261. The side seal 120 includes a main body portion 1203 and a first folded portion 1204. The first folded portion 1204 is folded towards the main body portion 1203, and a first crease 1263 is formed on the third end face 126. One end of the first crease 1263 is located at the first edge 1261, and the other end is located at the edge of the first corner sealing area 121. The distance between the first crease 1263 and the first edge 1261 gradually decreases along the direction from the bottom wall 112 to the top wall 113. In this embodiment, the side sealing edge 120 is folded at an angle to remove the bottom protrusion 1000 (it should be noted that the removal of the bottom protrusion 1000 described here means that the bottom protrusion 1000 does not protrude from the bottom wall 112 by folding at an angle), without having to cut the side sealing edge 120. This can improve the sealing performance of the side sealing edge 120 on the first cutting surface 125, thereby reducing the risk of leakage of the soft-pack battery.

[0057] Specifically, in this embodiment, the distance between the first crease 1263 and the first edge 1261 gradually decreases, that is, the first crease 1263 is inclined towards the central region of the side sealing structure 120 to increase the size of the first folded portion 1204, thereby reducing the risk of the side sealing edge 120 springing back after folding, and improving the reliability of the soft-pack battery in this embodiment. Specifically, it is known that for the side sealing edge 120, when the size of the first folded portion 1204 is small, the bending radius at the fold (i.e., the radius of curvature at the fold) will be significantly reduced. The smaller the bending radius, the greater the local strain, resulting in more severe tensile and compressive deformation of the inner and outer layers of the side sealing edge 120 after folding. Greater strain will trigger stronger elastic recovery force, thus making it easier to spring back. Furthermore, the smaller the size of the first folded portion 1204, the more significant the stress concentration at the fold. Stress concentration in a narrow area leads to greater internal stress (elastic stress) inside the fold. Therefore, in this embodiment, the first crease 1263 is inclined toward the middle area of ​​the side seal 120, thereby increasing the size of the folded portion 1204, which not only reduces the risk of the side seal 120 springing back, but also makes folding simpler.

[0058] Furthermore, in some embodiments, the side sealing edge includes the first cutting surface 125 as in the above embodiment, and the first crease 1263 is formed by folding the corner as in the above embodiment. Therefore, in this embodiment, the sharp corner of the first folded portion 1204 can be removed by cutting to reduce the risk of the packaging body 110 being punctured, while ensuring the sealing width to improve the sealing effect of the side sealing edge.

[0059] Reference Figure 10 , Figure 10 This is a schematic diagram of the structure of a fifth type of soft-pack battery according to the first aspect of this utility model. In some embodiments, the soft-pack outer shell 100 further includes a top sealing edge 130, which is connected to the top wall 113 and the side sealing edge 120. The soft-pack battery has a top corner 1202 at the connection between the side sealing edge 120 and the top sealing edge 130. Both the side sealing edge 120 and the top sealing edge 130 are folded towards the encapsulation body 110, and the top corner 1202 forms a top protrusion 150 protruding from the top wall 113. Specifically, it can be understood that in this embodiment, the side sealing edge 120 and the top sealing edge 130 are folded towards the encapsulation body 110, so that the side sealing edge 120 and the top sealing edge 130 can respectively provide a certain degree of protection for the side wall 111 and the top wall 113, thereby reducing the risk of damage to the soft-pack battery. Furthermore, folding the side sealing edge 120 can reduce the width of the soft-pack battery, thereby increasing the energy density of the soft-pack battery in this embodiment.

[0060] Reference Figures 10 to 13 , Figure 11 for Figure 10 A magnified view of region E in the middle. Figure 12 for Figure 10 A schematic diagram of the unfolded side and top seals of a soft-pack battery. Figure 13 for Figure 12 A magnified view of region F in the middle. Figure 14 This is a schematic diagram of the structure of the sixth soft-pack battery according to the first aspect of this utility model. Figure 15 for Figure 14 An enlarged view of region G. In some embodiments, the top sealing edge 130 includes a second rectangular sealing area 131, which extends along the length of the top sealing edge 130 and connects with the first rectangular sealing area 121. The top corner 1202 also includes a second corner sealing area 140 (e.g., Figure 13 (As shown). In the width direction of the side sealing edge 120, the second corner sealing area 140 is located on the side of the first rectangular sealing area 121 near the encapsulation body 110. In the width direction of the top sealing edge 130, the second corner sealing area 140 is located on the side of the second rectangular sealing area 131 near the encapsulation body 110, thereby increasing the sealing effect of the top corner 1202 of the soft-pack battery. Specifically, it can be seen that after the top sealing edge 130 and the side sealing edge 120 are folded towards the encapsulation body 110, a crease extending away from the encapsulation body 110 (specifically the second crease 1264) will be formed at the top corner 1202. In this embodiment, the second corner sealing area 140 is provided at the part of the top corner 1202 near the encapsulation body 110, so that part of the second crease 1264 is located in the second corner sealing area 140, thereby reducing the risk of soft-pack battery breakage caused by crease, thereby improving the sealing performance of the soft-pack battery and reducing the risk of soft-pack battery leakage.

[0061] Reference Figures 10 to 13 It is understandable that in conventional technology, when both the top sealing edge 130 and the side sealing edge 120 are folded towards the encapsulation body 110, the top corner 1202 will form a top protrusion 150 protruding from the top wall. This top protrusion 150 occupies space along the length of the pouch battery, thus affecting its energy density. Therefore, to improve the energy density of the pouch battery, in some embodiments, the top corner 1202 also has a second cutting surface 128 (e.g., ...). Figure 11 and Figure 13 As shown, one end of the second cut surface 128 is connected to the second end face 124, and the other end is connected to the fourth end face 127. The metal foil layer inside the top corner 1202 is exposed from the second cut surface 128. That is, during the processing, the top corner 1202 is first cut to form the second cut surface 128. After the cutting is completed, the side seal 120 and the top edge seal 130 are folded towards the encapsulation body 110. At the same time, the top corner 1202 is folded in half to form the top protrusion 150. Since the top corner 1202 is cut in this embodiment, the size of the top protrusion 150 in the length direction of the soft pack battery can be reduced, thus improving the energy density of the soft pack battery.

[0062] It should be noted that the reason why the top corner 1202 can be chamfered in this embodiment is because the top corner 1202 is provided with a second corner sealing area 140. Therefore, even if the top corner 1202 is cut, it can still be ensured that the top corner 1202 has sufficient sealing width, thereby ensuring the sealing performance of the soft-pack battery at the second cut surface 128. In addition, chamfering the top corner 1202 to remove the sharp corner can avoid the risk of the sharp corner piercing the encapsulated body.

[0063] In addition, refer to Figures 14 to 17 , Figure 14 This is a schematic diagram of the structure of the sixth type of soft-pack battery according to the first aspect of this utility model. Figure 15 for Figure 14 A magnified view of the G region. Figure 16 for Figure 14 A schematic diagram of the unfolded side and top seals of a soft-pack battery. Figure 17 for Figure 16An enlarged view of the H region. In some embodiments, the side sealing edge 120 includes a second end face 124 facing away from the encapsulation body 110 along its own width direction, a fourth end face 127 facing away from the first end face 123, and two third end faces 126 facing away from each other along its own thickness direction. The edge of the third end face 126 intersecting with the second end face 124 is the first edge 1261, and the edge of the third end face 126 intersecting with the fourth end face 127 is the second edge 1262. The top corner is folded to form a top protrusion 1000 (e.g., Figure 15 ), and form a second crease 1264 and a third crease 1264 on the third end face 126 (as shown in the image). Figure 17 The second crease 1264 has one end located at the first edge 1261 and the other end located at the second edge 1262. The third crease 1265 intersects with the second crease 1264, and one end of the third crease 1265 is spaced apart from both the first edge 1261 and the second edge 1262. That is, one end of the third crease 1265 is located in the inner area of ​​the side sealing edge 120, and the other end is located at the edge of the top corner 1202. For example, the other end of the third crease 1265 may be located at the first edge 1261 or the second edge 1262, or at the endpoint where the first edge 1261 and the second edge 1262 intersect (e.g., ...). Figure 17 (As shown). The top corner 1202 is folded along the second crease 1264 and the third crease 1265 to form a top protrusion 150. That is, in this embodiment, the top corner 1202 is first folded, and then the side sealing edge 120 and the top sealing edge 130 are folded towards the packaging body 110. The function of the folding is the same as that of the chamfering described above, and will not be repeated here. This forms a smaller top protrusion 150 to improve the energy density of the pouch battery. In addition, compared with the chamfering, this embodiment does not require cutting the top corner by folding, which can maximize the sealing width at the top corner 1202, thereby giving the pouch battery better sealing performance.

[0064] Based on the above embodiments, the two parts of the side seal 120 located on both sides of the second crease 1264 are defined as the main body 1203 and the second folded part 1205, respectively. The main body 1203 is connected to the side wall 111, and the top corner 1202 includes the second folded part 1205. The edge connecting the fourth end face 127 and the second end face 124 is defined as the apex angle 160. The second folded part 1205 includes the apex angle 160. The point in the main body 1203 that is symmetrical to the apex angle 160 with respect to the second crease 1264 is located at the second corner and is the sealing area 140. That is, when the second folded part 1205 is folded towards the main body 1203, the apex angle 160 is located in the second corner sealing area 140. Since the molten adhesive layer inside the second corner sealing area 140 is fused together, the second corner sealing area 140 has higher strength, thereby reducing the risk of the side seal 120 being punctured by the apex angle 160.

[0065] This reference Figure 14 and Figure 17 In some embodiments, the angle between the second crease 1264 and the second end face 124 is α, where α ≤ 135° (e.g., Figure 15 As shown), and the projection of the second crease 1264 along the width direction of the pouch battery is located outside the sidewall 111 (as shown). Figure 17 (As shown).

[0066] Specifically, it can be understood that after the top corner 1202 is folded along the second crease 1264 (i.e., flipped), the top corner 1202 will form a double-layer structure. For ease of explanation, the folded part is referred to as the second folded portion 1205. If the second folded portion 1205 is sandwiched between the side seal 120 and the side wall 111, the second folded portion 1205 will occupy additional space in the width direction of the soft-pack battery. In this embodiment, the angle between the second crease 1264 and the second end face 124 is α, α≤135°, and the projection of the second crease 1264 along the width direction of the soft-pack battery is located outside the side wall 111, thereby making the second folded portion 1205 located outside the side seal 120 and the side wall 111 (e.g., Figure 17 As shown, the second fold 1205 overlaps with the package body 110 in the width direction of the pouch battery, without having to occupy additional space in the width direction of the pouch battery, thereby reducing the width of the pouch battery and increasing the energy density of the pouch battery.

[0067] It should be noted that in some embodiments, the side seal 120 includes a second end face 124 facing away from the encapsulation body 110 along its own width direction. The side seal 120 also includes a first cutting surface 125, one end of which is connected to the first end face 123, and the other end is connected to the second end face 124. The soft-pack shell 100 is made of an encapsulation film, which includes a metal foil layer exposed from the first cutting surface 125. Meanwhile, the top corner 1202 is folded along the second crease 1264. The angle between the second crease 1264 and the second end face 124 is α, where α ≤ 135°. The projection of the second crease 1264 along the width direction of the soft-pack battery is located outside the side wall 111. That is, the formation of the second cutting surface 128 does not require additional space in the width of the soft-pack battery, thereby reducing the width of the soft-pack battery and increasing its energy density.

[0068] The second aspect of this application describes an electrical device, such as a mobile phone, watch, wristband, electric vehicle, or hybrid vehicle. The device includes the pouch battery from the first aspect embodiment. The pouch battery further has a first corner sealing area 122 between the first rectangular sealing area 121 and the smooth arc-shaped wall 114, thereby increasing the sealing width of the pouch casing 100 at the bottom corner 1201. Therefore, by cutting or folding the portion of the side sealing edge 120 that protrudes from the bottom wall 112 (the bottom protrusion), the first end face 123 of the side sealing edge 120 does not protrude from the bottom wall 112 of the encapsulation body 110, ensuring a sealing effect at the cut or folded points. Therefore, in this embodiment, a first corner sealing area 122 is provided between the first rectangular sealing area 121 and the smooth arc-shaped wall 114. This allows the portion of the side sealing edge 120 that protrudes from the bottom wall 112 of the encapsulation body 110 to be cut or folded while ensuring the sealing performance of the soft-pack battery. This prevents the first end face 123 of the side sealing edge 120 from protruding from the bottom wall 112 of the encapsulation body 110, thereby reducing the length of the soft-pack battery, increasing the energy density of the soft-pack battery, and thus improving the battery life of the electrical device in this embodiment.

[0069] It should be noted that since this embodiment adopts all the technical features of the soft-pack battery of the first aspect embodiment, this embodiment has all the beneficial effects brought by the first aspect embodiment, which will not be repeated here.

[0070] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, in the description of the present invention, the reference to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A pouch battery, characterized by, The soft package shell comprises a packaging body and a side sealing edge, the packaging body has a containing cavity, the packaging body comprises two side walls in the width direction of the soft package battery, a bottom wall and a top wall in the length direction of the soft package battery, the side sealing edge is connected to the side wall, the side wall and the bottom wall have a smooth arc wall which is arranged to be curved away from the containing cavity, the side wall and the bottom wall are smoothly connected via the smooth arc wall, the side sealing edge comprises a first sealing area, the first sealing area comprises a first rectangular sealing area and a first corner sealing area, the first rectangular sealing area extends along the length direction of the side sealing edge, the first corner sealing area is located between the first rectangular sealing area and the smooth arc wall, the side sealing edge comprises a first end face which is closer to the bottom wall, the first end face extends to the first corner sealing area, and the first end face does not protrude from the bottom wall in the direction from the top wall to the bottom wall. The electric core comprises an electric core body and a tab, the electric core body is located in the containing cavity, and the tab is connected to the electric core body and extends from the top wall. In the width direction of the side sealing edge, the first corner sealing area has a first boundary close to the smooth arc wall, the first boundary is in an arc curve, and the first rectangular sealing area has a second boundary close to the side wall, and the first boundary and the second boundary are smoothly connected.

2. The pouch battery of claim 1, wherein, The side sealing edge comprises a second end face which is away from the packaging body in the width direction of the side sealing edge, the side sealing edge further comprises a first cutting surface, one end of the first cutting surface is connected to the second end face and is arranged to be inclined relative to the second end face, and the first cutting surface extends to the edge of the first corner sealing area, the soft package shell is made of a packaging film, the packaging film comprises a metal foil layer, and the metal foil layer is exposed from the first cutting surface. 3.The pouch battery of claim 1, wherein, The side sealing edge comprises a second end face which is away from the packaging body in the width direction of the side sealing edge, and two third end faces which are arranged to be opposite to each other in the thickness direction of the side sealing edge, an edge where the third end face intersects with the second end face is a first edge, the side sealing edge comprises a main part and a first folding part, the first folding part is arranged to be folded towards the main part and forms a first crease at the third end face, one end of the first crease is located at the first edge, and the other end of the first crease is located at the edge of the first corner sealing area, and the distance between the first crease and the first edge gradually decreases in the direction from the bottom wall to the top wall. 4.The pouch battery according to claim 1 or 3, characterized by, The soft package shell further comprises a top sealing edge, the side sealing edge comprises a top corner, the top sealing edge part protrudes from the top wall in the direction from the bottom wall to the top wall, the top corner is connected to the top sealing edge, the side sealing edge and the top sealing edge are both arranged to be folded towards the packaging body, and the top corner forms a top protruding part which protrudes from the top wall. 5.The pouch battery of claim 1, wherein, ​ 6.The pouch battery of claim 5, wherein, The top sealing edge comprises a second rectangular sealing area extending along the length direction of the top sealing edge and connected with the first rectangular sealing area, and the top corner further comprises a second corner sealing area, in the width direction of the side sealing edge, the second corner sealing area is located on the side of the first rectangular sealing area close to the package body, and in the width direction of the top sealing edge, the second corner sealing area is located on the side of the second rectangular sealing area close to the package body.

7. The pouch battery of claim 6, wherein, The side sealing edge comprises a second end surface facing away from the package body in the width direction of the side sealing edge, a fourth end surface opposite to the first end surface, and two third end surfaces opposite to each other in the thickness direction of the side sealing edge, an edge of the third end surface intersecting with the second end surface is a first edge, and an edge of the third end surface intersecting with the fourth end surface is a second edge; The top corner is folded to form the top protruding part, and a second crease and a third crease are formed on the third end surface, one end of the second crease is located on the first edge, and the other end is located on the second edge; The third crease intersects with the second crease, one end of the third crease is spaced apart from the first edge and the second edge, and the other end is located on the edge of the third end surface.

8. The pouch battery of claim 7, wherein, An angle between the second crease and the second end surface is α, and α≤135°, and a projection of the second crease in the width direction of the soft package battery is located outside the side wall. 9.The pouch battery of claim 7, wherein, Two parts of the side sealing edge located on both sides of the second crease are defined as a main body part and a second folding part, respectively, the main body part is connected to the side wall, the top corner comprises the second folding part, an edge connecting the fourth end surface and the second end surface is defined as a top corner, the second folding part comprises the top corner, and a point in the main body part symmetric to the top corner about the second crease is located on the second corner sealing area.

10. An electrical device, characterized by The soft package battery comprises any one of claims 1 to 9. The soft package battery comprises any one of claims 1 to 9.

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