Battery

Abstract

The utility model discloses a battery which comprises a battery cell main body, a bottom adhesive layer and a head adhesive layer, the battery cell main body comprises a top surface and a bottom surface, and a first side surface, a second side surface, a third side surface and a fourth side surface which are positioned between the top surface and the bottom surface and are sequentially connected end to end along the circumferential direction, the step face comprises a first side face area, a vertical face area and a second side face area which are sequentially connected, and the second side face area protrudes outwards relative to the first side face area. The bottom adhesive layer is positioned at the bottom of the battery cell main body, and a first notch is formed in a position close to or corresponding to the vertical surface area; the head adhesive layer is positioned at the top of the battery cell main body, and a second notch is formed in a position close to or corresponding to the vertical surface area. The battery can be matched with a battery compartment structure with a local bulge through the stepped surface, so that the space utilization rate of a complete machine end is improved, and the battery capacity is improved.

Description

Technical Field

[0001] This application relates to the field of electrochemical technologies, and particularly to a battery. Background Art

[0002] With the thinning and lightening of digital products, the installation space left for the battery is getting smaller and smaller. Moreover, due to the layout of motherboard components and other reasons, the bottom surface of the whole machine's battery compartment may have local protrusions. According to the conventional flat battery solution, the space beside the local protrusions cannot be effectively utilized, resulting in space waste. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery that can be adapted to a battery compartment structure with local protrusions.

[0004] To achieve the above purpose, this application provides the following technical solutions:

[0005] A battery includes a core body, and also includes a bottom glue layer and a head glue layer, where:

[0006] The core body includes a top surface and a bottom surface, and a first side surface, a second side surface, a third side surface, and a fourth side surface that are sequentially connected end to end in a circumferential direction between the top surface and the bottom surface, where:

[0007] The second side surface is provided with a stepped surface, the stepped surface includes a first side surface area, a vertical surface area, and a second side surface area that are sequentially connected, and the second side surface area protrudes outward relative to the first side surface area;

[0008] The bottom glue layer is located at the bottom of the core body, and a first notch is provided at a position close to or corresponding to the vertical surface area;

[0009] The head glue layer is located at the top of the core body, and a second notch is provided at a position close to or corresponding to the vertical surface area.

[0010] Optionally, in the above battery, the bottom glue layer includes a first glue layer main area covering the bottom surface, a first folding ear area folded from the first glue layer main area to the bottom of the first side surface area, and a second folding ear area folded from the first glue layer main area to the bottom of the second side surface area; the first notch is located between the first folding ear area and the second folding ear area.

[0011] Optionally, in the above battery, the second folding ear area covers the bottom of the vertical surface area, where:

[0012] The first notch is located in the first side surface area;

[0013] The interval distance between the first notch and the vertical surface area is L2, and the value range of L2 satisfies 2mm ≥ L2 > 0.2mm.

[0014] Optionally, in the above-mentioned battery, a third notch is provided in the first lug area and / or the second lug area, where:

[0015] In a first direction parallel to the length direction of the vertical surface area, the gap distance between the inner bottom side of the third notch and the bottom side of the first adhesive layer located on the second side of the battery cell body is L1, and the value range of L1 satisfies 6 mm ≥ L1 ≥ 0.5 mm;

[0016] And / or, in a second direction perpendicular to the length direction of the vertical surface area, the two sides of the third notch are respectively located outside the sides of the first adhesive layer and maintain a gap distance L4 greater than zero from it, and the value range of L4 satisfies 5 mm ≥ L4 ≥ 0.5 mm.

[0017] Optionally, in the above-mentioned battery, the first notch is a U-shaped notch, and its opening direction is parallel to the length direction of the vertical surface area;

[0018] Alternatively, the bottom of the first notch is a circular notch, an oval notch or a strip-shaped hole notch, and the top and the bottom of the first notch are connected by a slit, and the extending direction of the slit is parallel to the length direction of the vertical surface area.

[0019] Optionally, in the above-mentioned battery, the bottom adhesive layer includes a first adhesive layer main area covering the bottom surface, a fifth lug area folded from the first adhesive layer main area to the first side surface, and a sixth lug area folded from the first adhesive layer main area to the third side surface.

[0020] Optionally, in the above-mentioned battery, the head adhesive layer includes a second adhesive layer main area covering the top surface, a third lug area folded from the second adhesive layer main area to the top of the first side surface area, and a fourth lug area folded from the second adhesive layer main area to the top of the second side surface area; the second notch is located between the third lug area and the fourth lug area.

[0021] Optionally, in the above-mentioned battery, the width dimension of the second notch is W, and the value range of W satisfies 15 mm ≥ W ≥ 3 mm;

[0022] And / or, the spacing distance between any one of the third lug area and the fourth lug area and the vertical surface area is L3, and the value range of L3 satisfies 12 mm ≥ L3 > 0.

[0023] Optionally, in the above-mentioned battery, the battery cell body includes a first stacked core and a second stacked core stacked along the thickness direction of the battery cell:

[0024] In the second direction, the length dimension of the first stacked core is smaller than that of the second stacked core to form the stepped surface;

[0025] The first stacked core and the second stacked core are bonded through a second adhesive layer; in the second direction, both ends of the second adhesive layer respectively extend beyond both ends of the positive electrode sheet in the first stacked core, and the value range of the spacing distance L5 between the first notch located in the first side area and the second adhesive layer satisfies 2 mm ≥ L5 > 0.2 mm.

[0026] Optionally, in the above battery, it further includes a tab, and the tab extends from the outer end of the top sealing edge at the junction of the top surface and the fourth side surface connected by the second side area.

[0027] Optionally, in the above battery, a first side sealing edge is provided on the first side surface, and the first side sealing edge includes an outward-turned double-folded edge structure; a second side sealing edge is provided on the third side surface, and the second side sealing edge includes an inward-turned double-folded edge structure.

[0028] As can be seen from the above technical solutions, in the battery provided in the present application, since a stepped surface is provided on the side of the battery to form a stepped structure, in this stepped structure, the area with a thinner cell thickness can be adapted to the raised area on the bottom surface of the battery compartment, and other areas with a thicker cell thickness can be normally installed in the battery compartment. It can be seen that the battery provided in the present application can be adapted to the battery compartment structure with local protrusions, which is beneficial to improving the space utilization rate at the whole machine end and increasing the battery capacity. In addition, in the battery provided in the present application, since the bottom adhesive layer and the head adhesive layer are respectively provided with a first notch and a second notch, it can avoid the vertical surface area in the stepped surface, thereby avoiding problems such as the wrinkling of the adhesive layer at the battery step (i.e., the position where the vertical surface area is located) or the void caused by the slope wrapping, resulting in space occupation and interference with the whole machine. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is the front view of a cell main body provided by an embodiment of the present application.

[0031] Figure 2 It is Figure 1 The cross-sectional view at the F-F position in

[0032] Figure 3 It is the front view of a battery provided by an embodiment of the present application.

[0033] Figure 4 is Figure 3 a partial enlarged view of the area where the bottom of the battery is located in

[0034] Figure 5 and Figure 6 are respectively axonometric views of the bottom structure of a battery provided by an embodiment of the present application at different angles.

[0035] Figure 7 is Figure 5 or Figure 6 a schematic structural view of the position where the first notch is located in

[0036] Figure 8a , Figure 8b , Figure 8c , Figure 8d are schematic structural views of several different structural forms of the first notch provided by an embodiment of the present application.

[0037] Figure 9 is Figure 3 a partial enlarged view of the position where the second notch located at the top of the battery is located in

[0038] Figure 10 is Figure 1 a partial enlarged view of the area where the top of the battery cell main body is located in

[0039] Figure 11 is Figure 10 an enlarged view of the M area in

[0040] Figure 12 is Figure 10 an enlarged view of the N area in

[0041] Wherein:

[0042] 10 - stepped surface, 101 - first side area, 102 - second side area, 103 - vertical surface area,

[0043] 11 - first side seal, 12 - second side seal, 13 - top seal, 14 - tab,

[0044] 15 - head glue layer, 16 - bottom glue layer, 17 - first bonding layer, 18 - protection plate,

[0045] 20 - top surface, 30 - bottom surface,

[0046] 41 - first stacked core, 42 - second stacked core, 43 - second bonding layer,

[0047] 150 - second glue layer main body area, 151 - third folding tab area, 152 - fourth folding tab area, 153 - second notch,

[0048] 160 - First adhesive layer main body area, 161 - First folding ear area, 162 - Second folding ear area, 163 - First notch

[0049] 164 - Third notch, 165 - Fifth folding ear area, 166 - Sixth folding ear area

[0050] 163A - U - shaped notch, 163B - Circular notch, 163C - Oval notch

[0051] 163D - Strip - shaped hole - like notch, Q - Slit Specific implementation mode

[0052] This application discloses a battery, on the side of which a stepped surface is provided, which can be adapted to a battery compartment structure with local protrusions.

[0053] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0054] Please refer to Figure 1 and Figure 2 The battery provided by the embodiment of this application includes a battery cell main body, where: the battery cell main body includes a top surface 20 and a bottom surface 30, and a first side surface, a second side surface, a third side surface, and a fourth side surface that are sequentially connected end to end in a circumferential direction between the top surface 20 and the bottom surface 30; a stepped surface 10 is provided on the second side surface, the stepped surface 10 includes a first side surface area 101, a vertical surface area 103, and a second side surface area 102 that are sequentially connected, and the second side surface area 102 protrudes outward relative to the first side surface area 101. Thus, in the battery cell thickness direction y perpendicular to the fourth side surface, if the battery cell thickness in the area where the first side surface area 101 is located is a, and the battery cell thickness in the area where the second side surface area 102 is located is b, then b > a.

[0055] Moreover, please refer to Figure 3 The battery provided by the embodiment of this application further includes a bottom adhesive layer 16 and a head adhesive layer 15, where: the bottom adhesive layer 16 is located at the bottom of the battery cell main body, and a first notch 163 is provided at a position close to or corresponding to the vertical surface area 103; the head adhesive layer 15 is located at the top of the battery cell main body, and a second notch 153 is provided at a position close to or corresponding to the vertical surface area 103.

[0056] It can be seen that in the battery provided by the present application, since a stepped surface 10 is provided on the side of the battery, a stepped structure is formed. In this stepped structure, the area with a thinner thickness of the battery cell can be adapted to the convex area on the bottom surface of the battery compartment, and other areas with a thicker thickness of the battery cell can be normally installed in the battery compartment. It can be seen that the battery provided by the present application can be adapted to the battery compartment structure with local protrusions, which is beneficial to improving the space utilization rate of the whole machine end and increasing the battery capacity. In addition, in the battery provided by the present application, since the bottom adhesive layer 16 and the head adhesive layer 15 are respectively provided with a first notch 163 and a second notch 153, the vertical surface area 103 in the stepped surface 10 can be avoided, so as to avoid the problem that the adhesive layers (i.e., the bottom adhesive layer 16 and the head adhesive layer 15, generally insulating adhesive paper) at the battery step (i.e., the position where the vertical surface area 103 is located) are wrinkled or have a ramp wrap void, resulting in space occupation and interference with the whole machine.

[0057] Please refer to Figures 3 to 7 , in some embodiments, the bottom adhesive layer 16 includes a first adhesive layer main body area 160 covering the bottom surface 30, a first folding ear area 161 folded from the first adhesive layer main body area 160 to the bottom of the first side area 101, and a second folding ear area 162 folded from the first adhesive layer main body area 160 to the bottom of the second side area 102; the first notch 163 is located between the first folding ear area 161 and the second folding ear area 162. Moreover, please refer to Figure 7 , in some embodiments, the second folding ear area 162 covers the bottom of the vertical surface area 103, so that the first notch 163 is located in the first side area 101. Moreover, the spacing distance between the first notch 163 and the vertical surface area 103 is L2, and preferably the value range of L2 satisfies 2mm ≥ L2 > 0.2mm. It can be seen that the first notch 163 does not overlap with the bottom of the vertical surface area 103, and the second folding ear area 162 of the bottom adhesive layer 16 protrudes towards the first side area 101 relative to the second side area 102 and the vertical surface area 103, and its protruding distance L2 is any value within the range of 0.2mm to 2mm, so that the bottom adhesive layer 16 can completely cover the bottom corner position of the stepped vertical surface area (i.e., the bottom of the vertical surface area 103 and its joints with the first side area 101 and the second side area 102), avoiding falling damage. More importantly, since the stacked cores inside the main body aluminum plastic film of the battery cell are prone to form corner positions at the stepped corners, and the stacked cores will expand regularly during the charge and discharge process, resulting in the stacked cores expanding in the battery cell thickness direction y and the battery cell width direction (i.e., Figure 2 the second direction x in), mainly the negative electrode will expand during charging, resulting in stress concentration at the corner positions, thus forming the "battery cell corner break" phenomenon. Therefore, in specific embodiments, it is preferably to make the second folding ear area 162 of the bottom adhesive layer 16 completely cover the bottom of the vertical surface area 103 and its joints with the first side area 101 and the second side area 102.

[0058] Please refer to Figure 3 ,Figure 4 and Figure 6 In some embodiments, a third notch 164 for avoiding the first adhesive layer 17 (specifically, double-sided tape) is provided in the first lug area 161 and / or the second lug area 162. Moreover, when the battery is installed in the battery compartment, the projection of the third notch 164 on the bottom surface of the battery compartment does not overlap with the area where the fixing glue is located in the battery compartment; and / or, as Figure 4 shown in Figure 4 in the first direction z parallel to the length direction of the vertical surface area 103 (i.e., the direction indicated by the z coordinate in

[0059] In addition, in some embodiments, as Figure 4 shown in Figure 4 in the second direction x perpendicular to the length direction of the vertical surface area 103 (i.e., the direction indicated by the z coordinate in

[0060] Please refer to Figure 7 and Figure 8a , Figure 8b , Figure 8c , Figure 8d , in some embodiments, the first notch 163 can be designed as a U-shaped notch 163A, and its opening direction is parallel to the length direction of the vertical surface area 103 (i.e., the direction indicated by the z coordinate in Figure 7 ). Alternatively, in other embodiments, the bottom of the first notch 163 can also be a circular notch 163B or an elliptical notch 163C or a strip-shaped hole notch 163D, and the top and bottom of the first notch 163 are connected by a slit Q, and the extending direction of the slit Q is parallel to the length direction of the vertical surface area 103. However, it is not limited thereto. In other embodiments, the first notch 163 can also be designed into any other shape as long as it can avoid the problem of glue layer wrinkling, offset stress to avoid the "corner break of the battery cell" problem, and play functions such as drop protection.

[0061] In some embodiments, in the second direction x, the length of the bottom glue layer 16 is designed to be longer than the width of the battery cell body, so that both sides of the bottom glue layer 16 can be folded over to wrap the bottoms of both sides of the battery cell body, avoiding the problem of aluminum leakage at the sealing edge. Specifically, please refer toFigure 4 and Figure 6 , the bottom glue layer 16 includes a first glue layer main body area 160 covering the bottom surface 30, a fifth folded ear area 165 folded from the first glue layer main body area 160 to the first side surface, and a sixth folded ear area 166 folded from the second glue layer main body area 150 to the third side surface. Among them, both the fifth folded ear area 165 and the sixth folded ear area 166 can adopt a double-folded edge structure.

[0062] Please refer to Figure 3 and Figure 9 , in some embodiments, the head glue layer 15 includes a second glue layer main body area 150 covering the top surface 20, a third folded ear area 151 folded from the second glue layer main body area 150 to the top of the first side surface area 101, and a fourth folded ear area 152 folded from the second glue layer main body area 150 to the top of the second side surface area 102; the second notch 153 is located between the third folded ear area 151 and the fourth folded ear area 152. Specifically, when implementing, it is preferably set that the width dimension of the second notch 153 is W, and the value range of W satisfies 15mm≥W≥3mm; and / or, the spacing distance between any one of the third folded ear area 151 and the fourth folded ear area 152 and the vertical surface area 103 is L3, and the value range of L3 satisfies 12mm≥L3>0. It can be seen that the head glue layer 15 is provided with an avoidance notch, that is, the second notch 153, at the position corresponding to the top of the cell step vertical surface area 103, which can ensure that the head glue layer 15 does not overlap with the corner of the stepped surface (i.e., the vertical surface area 103), thereby avoiding the problems of wrinkles or slope voids of the head glue layer 15 at this position, resulting in space occupation and interference with the whole machine.

[0063] Please refer to Figure 2, in some embodiments, the battery cell body includes a first stacked core 41 and a second stacked core 42 that are stacked along the thickness direction y of the battery cell. The first stacked core 41 and the second stacked core 42 are respectively stacked along the thickness direction y of the battery cell and are provided with a plurality of positive and negative electrode sheets at intervals. Moreover, in the first direction z, the length dimensions of the first stacked core 41 and the second stacked core 42 are equal; in the second direction x, the length dimension of the first stacked core 41 is smaller than the length dimension of the second stacked core 42, thereby forming a stepped surface 10 (including a first side area 101, a vertical area 103, and a second side area 102). Among them, the first stacked core 41 and the second stacked core 42 are bonded by a second bonding layer 43; in the second direction x, both ends of the second bonding layer 43 respectively extend beyond both ends of the positive electrode sheet in the first stacked core 41; and, the first notch 163 is located in the first side area 101 and the value range of the spacing distance L5 between the first notch 163 and the second bonding layer 43 satisfies 2mm ≥ L5 > 0.2mm. In other words: the second folded ear area 162 where the bottom adhesive layer 16 is folded to the bottom of the second side area 102 exceeds the side edge of the vertical area 103 as the first inner side edge J, and the side edge where the second bonding layer 43 extends beyond the positive electrode sheet 411 in the first stacked core 41 is the second inner side edge K, and the value range of the spacing distance L5 between the first inner side edge J and the second inner side edge satisfies 2mm ≥ L5 > 0.2mm. Specifically, the second bonding layer 43 can be a double-sided adhesive, or other materials or components that can fixedly connect the lowermost positive electrode sheet of the first stacked core 41 and the uppermost positive electrode sheet of the second stacked core 42.

[0064] It should be noted here that the reason for setting the above spacing distance L5 between the first notch 163 and the second bonding layer 43 at the bottom of the first stacked core 41 is to enable the surface adhesive tape attached to the outside of the battery cell body to cover the second bonding layer 43 located inside the battery cell body, to avoid wrinkles or protrusions on the aluminum plastic film at the position of the second bonding layer 43, so as to avoid damage to the battery during the battery installation process due to the wrinkles or protrusions, which may lead to battery leakage. Therefore, at least the above spacing distance L5 is kept greater than 0.2mm. In addition, the reason why the spacing distance L5 does not exceed 2mm is to avoid excessive adhesive layer covering, which may cause the battery to occupy too much space in the battery compartment.

[0065] Please refer to Figure 1 and Figure 3 and Figures 10 to 12 , and when specifically implemented, the battery provided in the present application further includes a top sealing edge 13, a tab 14, a protection board 18, a first side sealing edge 11, and a second side sealing edge 12. Among them: the top sealing edge 13 is located at the junction of the top surface 20 and the fourth side surface; the tab 14 extends from the outer end of the top sealing edge 13 at the junction of the fourth side surface and the second top area 202 and is connected to the protection board 18, that is, the tab 14 extends from the top area with a thicker battery cell thickness, and there is no tab output from the top area with a thinner battery cell thickness; the head adhesive layer 15 covers the connection between the tab 14 and the protection board 18; the first side sealing edge 11 is located on the first side surface of the battery cell body (i.e.,Figure 1 (the left side in Figure 1 ), since the thickness of the battery cell on this side is relatively thin, the first side seal 11 preferably adopts an outward double-folded edge structure; the second side seal 12 is located on the third side of the battery cell body (i.e.,

[0066] Specifically, please refer to Figure 11 . In this article, the so-called "outward fold" means folding in the direction away from the battery cell body. This outward double-folded edge structure includes a first seal layer 111 and a second seal layer 112 arranged in layers, where: the first seal layer 111 is attached to the first side of the battery cell body; the first side of the first seal layer 111 is connected to the coating film layer on the fourth side of the battery cell body, and the second side of the first seal layer 111 opposite to the first side is connected to the second seal layer 112, and the second seal layer 112 is folded outward from the second side of the first seal layer 111 and attached to the outer surface of the first seal layer 111.

[0067] Moreover, please refer to Figure 12 . In this article, the so-called "inward fold" means folding in the direction close to the battery cell body. This inward double-folded edge structure includes a third seal layer 121 and a fourth seal layer 122 arranged in layers, where: the third seal layer 121 is located outside the third side of the battery cell body; the third side of the third seal layer 121 is connected to the coating film layer on the fourth side of the battery cell body, and the fourth side of the third seal layer 121 opposite to the third side is connected to the fourth seal layer 122, and the fourth seal layer 122 is folded inward from the fourth side of the third seal layer 121 and located between the inner surface of the third seal layer 121 and the third side of the battery cell body.

[0068] Here, it should be noted that the above-mentioned first side seal 11 and second side seal 12 adopt different folding processes respectively, aiming to ensure that the folded edge does not protrude from the battery cell body. Among them, the second side seal 12 with an inward double-folded edge structure is located on the second side with a relatively thick battery cell thickness, which can play an insulating role at this position, and can ensure the inner bending space and glue space required by the inward folding method, avoiding the problem of the seal edge protruding from the battery cell surface and causing excessive thickness due to the thin battery cell thickness. In addition, the first side seal 11 on the first side with a relatively thin battery cell thickness adopts an outward double-folded edge structure, which can solve the problem of the shallow pit step size required for the inner fold of the seal edge. Here, it should be noted that since the first side seal 11 is in a non-insulated state when folded outward, the first side seal 11 needs to be wrapped with insulating paper for insulation or spot UV glue (also known as shadowless glue or photosensitive glue) for insulation.

[0069] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0071] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery, comprising a battery cell main body, characterized in that, It further includes a bottom adhesive layer (16) and a head adhesive layer (15), wherein: The battery cell body includes a top surface (20) and a bottom surface (30), and a first side surface, a second side surface, a third side surface, and a fourth side surface that are sequentially connected end to end in a circumferential direction between the top surface (20) and the bottom surface (30), wherein: The second side surface is provided with a stepped surface (10), and the stepped surface (10) includes a first side surface area (101), a vertical surface area (103), and a second side surface area (102) that are sequentially connected. The second side surface area (102) protrudes outward relative to the first side surface area (101); The bottom adhesive layer (16) is located at the bottom of the battery cell body and is provided with a first notch (163) at a position close to or corresponding to the vertical surface area (103); The head adhesive layer (15) is located at the top of the battery cell body and is provided with a second notch (153) at a position close to or corresponding to the vertical surface area (103).

2. The battery according to claim 1, characterized in that, The bottom adhesive layer (16) includes a first adhesive layer main body area (160) covering the bottom surface (30), a first folded ear area (161) that is folded relative to the first adhesive layer main body area (160) to the bottom of the first side surface area (101), and a second folded ear area (162) that is folded relative to the first adhesive layer main body area (160) to the bottom of the second side surface area (102); the first notch (163) is located between the first folded ear area (161) and the second folded ear area (162).

3. The battery according to claim 2, wherein The second folded ear area (162) covers the bottom of the vertical surface area (103), wherein: The first notch (163) is located in the first side surface area (101); The spacing distance between the first notch (163) and the vertical surface area (103) is L2, and the value range of L2 satisfies 2 mm ≥ L2 > 0.2 mm.

4. The battery according to claim 2, wherein The first folded ear area (161) and / or the second folded ear area (162) is provided with a third notch (164), wherein: In a first direction (z) parallel to the length direction of the vertical surface area (103), the gap distance between the inner bottom side edge of the third notch (164) and the bottom edge of the first adhesive layer (17) located on the second side surface of the battery cell body is L1, and the value range of L1 satisfies 6 mm ≥ L1 ≥ 0.5 mm; And / or, in a second direction (x) perpendicular to the length direction of the vertical surface area (103), the two side edges of the third notch (164) are respectively located outside the side edges of the first adhesive layer (17) and maintain a gap distance L4 greater than zero from it, and the value range of L4 satisfies 5 mm ≥ L4 ≥ 0.5 mm.

5. The battery according to claim 1, characterized in that, The first notch (163) is a U-shaped notch (163A), and its opening direction is parallel to the length direction of the vertical surface area (103); Alternatively, the bottom of the first notch (163) is a circular notch (163B), an oval notch (163C), or a strip-shaped hole notch (163D). The top and the bottom of the first notch (163) are connected by a slit (Q), and the extending direction of the slit (Q) is parallel to the length direction of the vertical surface area (103).

6. The battery according to claim 1, wherein The bottom adhesive layer (16) includes a first adhesive layer main body area (160) covering the bottom surface (30), a fifth folded ear area (165) folded from the first adhesive layer main body area (160) to the first side surface, and a sixth folded ear area (166) folded from the first adhesive layer main body area (160) to the third side surface.

7. The battery according to claim 1, characterized in that, The head adhesive layer (15) includes a second adhesive layer main body area (150) covering the top surface (20), a third folded ear area (151) folded from the second adhesive layer main body area (150) to the top of the first side surface area (101), and a fourth folded ear area (152) folded from the second adhesive layer main body area (150) to the top of the second side surface area (102); the second notch (153) is located between the third folded ear area (151) and the fourth folded ear area (152).

8. The battery according to claim 7, characterized in that, The width dimension of the second notch (153) is W, and the value range of W satisfies 15 mm ≥ W ≥ 3 mm. And / or, the spacing distance L3 between any one of the third folded ear area (151) and the fourth folded ear area (152) and the vertical surface area (103) satisfies 12 mm ≥ L3 > 0.

9. The battery according to claim 1, characterized in that, The battery cell body includes a first stacked core (41) and a second stacked core (42) stacked along the thickness direction (y) of the battery cell: In the second direction (x), the length dimension of the first stacked core (41) is smaller than the length dimension of the second stacked core (42) to form the stepped surface (10). The first stacked core (41) and the second stacked core (42) are bonded by a second bonding layer (43); in the second direction (x), both ends of the second bonding layer (43) respectively extend beyond both ends of the positive electrode sheet in the first stacked core (41), and the value range of the spacing distance L5 between the first notch (163) located in the first side surface area (101) and the second bonding layer (43) satisfies 2 mm ≥ L5 > 0.2 mm.

10. The battery according to claim 1, characterized in that, It further includes a tab (14), and the tab (14) extends out from the outer end of the top sealing edge (13) at the junction of the top surface and the fourth side surface connected by the second side surface area (102). And / or, the first side surface is provided with a first side sealing edge (11), and the first side sealing edge (11) includes an outwardly turned double-folded edge structure; the third side surface is provided with a second side sealing edge (12), and the second side sealing edge (12) includes an inwardly turned double-folded edge structure.

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