Battery

Abstract

Provided in the present application is a battery, comprising a battery cell main body, a bottom adhesive layer and a head adhesive layer, wherein 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 located between the top surface and the bottom surface and are successively connected end to end in a circumferential direction; the second side surface has a stepped surface, the stepped surface comprising a first side surface region, a vertical surface region and a second side surface region which are successively connected, and the second side surface region protruding outwards with respect to the first side surface region; the bottom adhesive layer is located at the bottom of the battery cell main body and is provided with a first notch at a position close to or corresponding to the vertical surface region; the head adhesive layer is located at the top of the battery cell main body and is provided with a second notch at a position close to or corresponding to the vertical surface region. By means of the stepped surface, the battery can be adapted to a battery compartment structure having a local protrusion, thereby helping to improve the space utilization rate of entire devices and improve the battery capacity.

Description

A battery

[0001] The present application claims priority to the Chinese patent application No. 202422182630.7, filed on September 5, 2024, and entitled "A battery", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery energy, and more particularly, to a battery. BACKGROUND

[0003] With the light and thin of digital products, the installation space left for the battery is getting smaller and smaller, and the bottom surface of the battery compartment of the whole machine may have a local protrusion due to the layout of the mainboard device. According to the conventional flat battery scheme, the space beside the local protrusion cannot be effectively utilized, resulting in space waste. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a battery that can be adapted to a battery compartment structure with a local protrusion.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A battery includes a cell body, a bottom adhesive layer, and a head adhesive layer, wherein:

[0007] The cell 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 connected in sequence along the circumference between the top surface and the bottom surface, wherein:

[0008] The second side surface is provided with a stepped surface including a first side surface area, a vertical surface area, and a second side surface area connected in sequence, and the second side surface area protrudes outward relative to the first side surface area;

[0009] The bottom adhesive layer is located at the bottom of the cell body and is provided with a first gap at a position close to or corresponding to the vertical surface area;

[0010] The head adhesive layer is located at the top of the cell body and is provided with a second gap at a position close to or corresponding to the vertical surface area.

[0011] In some embodiments, in the above battery, the bottom adhesive layer includes a first adhesive layer main area covering the bottom surface, a first ear folding area folding to the bottom of the first side surface area relative to the first adhesive layer main area, and a second ear folding area folding to the bottom of the second side surface area relative to the first adhesive layer main area; and the first gap is located between the first ear folding area and the second ear folding area.

[0012] In some embodiments, in the battery described above, the second earfold region covers the bottom of the facade region, wherein:

[0013] The first notch is located on the first side region;

[0014] The interval distance between the first notch and the facade region is L2, and the value range of L2 satisfies 2mm≥L2>0.2mm.

[0015] In some embodiments, in the battery described above, the first earfold region and / or the second earfold region is provided with a third notch, wherein:

[0016] In a first direction parallel to the length direction of the facade region, 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 cell body is L1, and the value range of L1 satisfies 6mm≥L1≥0.5mm;

[0017] And / or, in a second direction perpendicular to the length direction of the facade region, the two side edges of the third notch are respectively located outside the side edges of the first adhesive layer and maintain a gap distance L4 greater than zero, and the value range of L4 satisfies 5mm≥L4≥0.5mm.

[0018] In some embodiments, in the battery described above, the first notch is a U-shaped notch, and the opening direction of the first notch is parallel to the length direction of the facade region;

[0019] Alternatively, the bottom of the first notch is a circular notch or an elliptical notch or a strip-shaped hole-shaped notch, the top of the first notch and the bottom are connected by a slit, and the extension direction of the slit is parallel to the length direction of the facade region.

[0020] In some embodiments, in the battery described above, the bottom adhesive layer includes a first adhesive layer main region covering the bottom surface, and a fifth earfold region folded to the first side with respect to the first adhesive layer main region and a sixth earfold region folded to the third side with respect to the first adhesive layer main region.

[0021] In some embodiments, in the battery described above, the head adhesive layer includes a second adhesive layer main region covering the top surface, and a third earfold region folded to the top of the first side region with respect to the second adhesive layer main region and a fourth earfold region folded to the top of the second side region with respect to the second adhesive layer main region; the second notch is located between the third earfold region and the fourth earfold region.

[0022] In some embodiments, in the battery described above, the width dimension of the second notch is W, and the value range of W satisfies 15mm≥W≥3mm;

[0023] And / or, the interval distance between any one of the third and fourth tab folding areas and the facade area is L3, the value range of L3 satisfies 12mm > L3 > 0.

[0024] In some embodiments, in the above-mentioned battery, the cell body comprises a first stack of cells and a second stack of cells arranged in a stacked manner along the thickness direction of the cell,

[0025] In the second direction, the length dimension of the first stack of cells is smaller than the length dimension of the second stack of cells to form the stepped surface;

[0026] The first stack of cells and the second stack of cells are bonded by a second bonding layer, and in the second direction, the two ends of the second bonding layer respectively extend beyond the two ends of the positive plate in the first stack of cells, and the first gap is located between the first side area and the second bonding layer with an interval distance L5, the value range of L5 satisfies 2mm > L5 > 0.2mm.

[0027] In some embodiments, in the above-mentioned battery, further comprising a tab, the tab extends from the outer end of the top sealing edge at the intersection of the top surface and the fourth side surface connected by the second side surface.

[0028] In some embodiments, in the above-mentioned battery, the first side surface is provided with a first side sealing edge, the first side sealing edge comprises an outwardly turned double folded edge structure; the third side surface is provided with a second side sealing edge, the second side sealing edge comprises an inwardly turned double folded edge structure.

[0029] As can be seen from the above technical solutions, in the battery provided by the present application, the stepped structure is formed due to the stepped surface provided on the side surface of the battery, so that the area with thinner cell thickness in the stepped structure can be adapted to the raised area of the battery compartment bottom surface, and the other area with thicker cell thickness 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 improve the utilization rate of the whole machine end space and improve the battery capacity. In addition, in the battery provided by the present application, the first gap and the second gap are respectively formed in the bottom adhesive layer and the head adhesive layer, which can avoid the stepped surface (i.e. the position of the facade area) of the battery, so as to avoid the problem of space occupation and interference with the whole machine caused by the wrinkling or slope of the adhesive layer at the battery step. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0031] Fig. 1 is a front view of a battery cell body according to an embodiment of the present application;

[0032] Fig. 2 is a sectional view of the position F-F in Fig. 1;

[0033] Fig. 3 is a front view of a battery according to an embodiment of the present application;

[0034] Fig. 4 is an enlarged view of the area at the bottom of the battery in Fig. 3;

[0035] Fig. 5 and Fig. 6 are axonometric views of the bottom structure of a battery according to an embodiment of the present application from different angles;

[0036] Fig. 7 is a structural schematic view of the position of the first notch in Fig. 5 or Fig. 6;

[0037] Fig. 8a, Fig. 8b, Fig. 8c and Fig. 8d are structural schematic views of the first notch in different structural forms according to an embodiment of the present application;

[0038] Fig. 9 is an enlarged view of the position of the second notch at the top of the battery in Fig. 3;

[0039] Fig. 10 is an enlarged view of the area at the top of the battery cell body in Fig. 1;

[0040] Fig. 11 is an enlarged view of the area M in Fig. 10;

[0041] Fig. 12 is an enlarged view of the area N in Fig. 10.

[0042] Wherein: 10 - stepped surface; 101 - first side surface area; 102 - second side surface area; 103 - vertical surface area; 11 - first side edge; 12 - second side edge; 13 - top edge; 14 - tab; 15 - head adhesive layer; 16 - bottom adhesive layer; 17 - first adhesive layer; 18 - protection plate; 20 - top surface; 30 - bottom surface; 41 - first stacked cell; 42 - second stacked cell; 43 - second adhesive layer; 150 - second adhesive layer main area; 151 - third tab area; 152 - fourth tab area; 153 - second notch; 160 - first adhesive layer main area; 161 - first tab area; 162 - second tab area; 163 - first notch; 164 - third notch; 165 - fifth tab area; 166 - sixth tab area; 163A - U-shaped notch; 163B - circular notch; 163C - oval notch; 163D - strip hole-shaped notch; Q - cut seam. DETAILED DESCRIPTION

[0043] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made with reference to the accompanying drawings in which like reference numerals refer to like elements. The following description of exemplary embodiments is not representative of all possible embodiments consistent with the present application. Rather, it is merely an example of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments represent only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0045] The present application discloses a battery, which is provided with a stepped surface on the side surface and can be adapted to a battery compartment structure with a local protrusion.

[0046] Referring to FIG. 1 and FIG. 2, the battery provided by the embodiments of the present application comprises a battery core body, wherein: the battery core body comprises 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 connected in sequence along the circumference between the top surface 20 and the bottom surface 30; the second side surface is provided with a stepped surface 10, the stepped surface 10 comprises a first side surface area 101, a vertical surface area 103 and a second side surface area 102 connected in sequence, and the second side surface area 102 protrudes outward relative to the first side surface area 101, so that in the battery core thickness direction y perpendicular to the fourth side surface, if the battery core thickness of the area where the first side surface area 101 is located is a, and the battery core thickness of the area where the second side surface area 102 is located is b, then b > a.

[0047] Moreover, referring to FIG. 3, the battery provided by the embodiments of the present application further comprises a bottom adhesive layer 16 and a head adhesive layer 15, wherein: the bottom adhesive layer 16 is located at the bottom of the battery core 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 core body and is provided with a second notch 153 at a position close to or corresponding to the vertical surface area 103.

[0048] It can be seen that, in the battery provided in the application, the battery side is provided with a stepped surface 10, forming a step structure, so that the area with thinner thickness of the battery cell can be matched with the raised area of the bottom surface of the battery compartment, and other areas with thicker thickness of the battery cell can be normally installed in the battery compartment. It can be seen that the battery provided in the application can be matched with the battery compartment structure with a local protrusion, which is beneficial to improve the utilization rate of the whole machine end space and improve the battery capacity. In addition, in the battery provided in the application, the first gap 163 and the second gap 153 are respectively formed in the bottom adhesive layer 16 and the head adhesive layer 15, which can avoid the vertical surface area 103 in the stepped surface 10, so as to avoid the problem of space occupation and interference with the whole machine caused by the wrinkling or slope of the adhesive layer (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 of the vertical surface area 103).

[0049] Please refer to FIGS. 3 to 7, in some embodiments, the bottom adhesive layer 16 includes a first adhesive layer main area 160 covering the bottom surface 30, and a first ear folding area 161 opposite to the first adhesive layer main area 160 and folded to the bottom of the first side surface area 101, and a second ear folding area 162 opposite to the first adhesive layer main area 160 and folded to the bottom of the second side surface area 102; the first gap 163 is located between the first ear folding area 161 and the second ear folding area 162. Moreover, please refer to FIG. 7, in some embodiments, the second ear folding area 162 covers the bottom of the vertical surface area 103, so that the first gap 163 is located in the first side surface area 101, and the interval distance between the first gap 163 and the vertical surface area 103 is L2, the value range of L2 satisfies 2mm≥L2>0.2mm. It can be seen that the first gap 163 does not overlap with the bottom of the vertical surface area 103, and the second ear folding area 162 of the bottom adhesive layer 16 is protrudingly arranged relative to the second side surface area 102 and the vertical surface area 103 towards the direction close to the first side surface 101, and the protruding distance L2 is any value within the range of 0.2mm-2mm, so that the bottom adhesive layer 16 can completely cover the bottom corner position of the step vertical surface area (i.e. the bottom of the vertical surface area 103 and the joint thereof with the first side surface 101 and the second side surface area 102), avoiding damage caused by falling. More importantly, since the stacked cells inside the battery cell main body aluminum plastic film are prone to form a corner position at the step corner, the stacked cells will regularly expand in the thickness direction y and the width direction (i.e. the second direction x in FIG. 2) of the battery cell during charging and discharging, mainly the negative electrode will expand during charging, causing stress concentration at the corner position, thereby forming the phenomenon of "battery cell corner breakage", therefore in the specific embodiments, the second ear folding area 162 of the bottom adhesive layer 16 can completely cover the bottom of the vertical surface area 103 and the joint thereof with the first side surface 101 and the second side surface area 102.

[0050] Please refer to FIG. 3, FIG. 4 and FIG. 6, in some embodiments, the first ear folding area 161 and / or the second ear folding area 162 is provided with a third notch 164 for avoiding the first adhesive layer 17 (which can be double-sided tape in particular). Moreover, when the battery is installed into the battery compartment, the projection of the third notch 164 on the bottom surface of the battery compartment does not overlap the area where the fixing tape is located in the battery compartment; and / or, as shown in FIG. 4, in the first direction z parallel to the length direction of the facade area 103 (i.e. the direction indicated by the z coordinate in FIG. 4), the gap distance between the inner bottom side of the third notch 164 and the bottom side of the first adhesive layer 17 located on the second side of the battery cell body is L1, and the value of L1 satisfies 6mm≥L1≥0.5mm. Thus, the third notch 164 can help reduce the thickness space of the battery.

[0051] In addition, in some embodiments, as shown in FIG. 4, in the second direction x perpendicular to the length direction of the facade area 103 (i.e. the direction indicated by the z coordinate in FIG. 4), the two side edges of the third notch 164 are located outside the side edges of the first adhesive layer 17 and maintain a gap distance L4 greater than zero, and the value of L4 satisfies 5mm≥L4≥0.5mm. Thus, the gap distance L4 can effectively prevent the first adhesive layer 17 from overlapping the first ear folding area 161 or the second ear folding area 162 protruding to the left and right of the bottom adhesive layer 16 after being attached askew, and occupying the thickness space.

[0052] Please refer to FIG. 7 and FIG. 8a, FIG. 8b, FIG. 8c, FIG. 8d, in some embodiments, the first notch 163 can be designed as a U-shaped notch 163A, and the opening direction of the U-shaped notch 163A is parallel to the length direction of the facade area 103 (i.e. the direction indicated by the z coordinate in FIG. 7). Alternatively, in other embodiments, the bottom of the first notch 163 can be a circular notch 163B or an elliptical notch 163C or a strip-shaped hole-like notch 163D, and the top and bottom of the first notch 163 are connected by a cut Q, and the extension direction of the cut Q is parallel to the length direction of the facade area 103. However, this is not limited thereto, and in other embodiments, the first notch 163 can also be designed as any other shape, as long as it can avoid adhesive wrinkling, offset stress, avoid the problem of "cell corner breakage" and play the function of drop protection, etc.

[0053] In some embodiments, in the second direction x, the length of the bottom adhesive layer 16 is designed to be longer than the width of the battery cell body, so that the two sides of the bottom adhesive layer 16 can be folded and wrapped around the two sides of the bottom of the battery cell body, thereby avoiding the problem of edge sealing aluminum leakage. As shown in FIG. 4 and FIG. 6, the bottom adhesive layer 16 includes a first adhesive layer body area 160 covering the bottom surface 30, and a fifth ear folding area 165 folded to the first side relative to the first adhesive layer body area 160 and a sixth ear folding area 166 folded to the third side relative to the second adhesive layer body area 150. The fifth ear folding area 165 and the sixth ear folding area 166 can both adopt a double-folded edge structure.

[0054] Please refer to FIG. 3 and FIG. 9, in some embodiments, the head adhesive layer 15 includes a second adhesive layer body area 150 covering the top surface 20, and a third folded ear area 151 folded to the top of the first side surface area 101 relative to the second adhesive layer body area 150, and a fourth folded ear area 152 folded to the top of the second side surface area 102 relative to the second adhesive layer body area 150; a second gap 153 is located between the third folded ear area 151 and the fourth folded ear area 152. In specific implementation, the width dimension of the second gap 153 can be W, and the value range of W satisfies 15mm≥W≥3mm; and / or, the interval 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 adhesive layer 15 is provided with a gap, i.e. the second gap 153, at the position corresponding to the top of the cell step vertical surface area 103, which can ensure that the head adhesive layer 15 does not overlap with the step corner (i.e. the vertical surface area 103), thereby avoiding the problems of wrinkles or slope emptying of the head adhesive layer 15 at this position, resulting in space occupation and interference with the whole machine.

[0055] Please refer to FIG. 2, in some embodiments, the cell main body includes a first stack of cells 41 and a second stack of cells 42 arranged in a stack along the cell thickness direction y, and the first stack of cells 41 and the second stack of cells 42 are respectively arranged with a plurality of positive and negative electrode sheets in a stack and spaced apart along the cell thickness direction y. Moreover, in the first direction z, the length dimensions of the first stack of cells 41 and the second stack of cells 42 are equal; in the second direction x, the length dimension of the first stack of cells 41 is smaller than the length dimension of the second stack of cells 42, thereby forming a step surface 10 (including the first side surface area 101, the vertical surface area 103 and the second side surface area 102). Wherein, the first stack of cells 41 and the second stack of cells 42 are bonded by a second bonding layer 43; in the second direction x, the two ends of the second bonding layer 43 respectively exceed the two ends of the positive electrode sheet in the first stack of cells 41; and the interval distance L5 between the first side surface area 101 and the second bonding layer 43 satisfies 2mm≥L5>0.2mm. In other words: the second folded ear area 162 of the bottom adhesive layer 16 folded to the bottom of the second side surface area 102 exceeds the first inner side edge J of the side edge of the vertical surface area 103, and the second bonding layer 43 exceeds the second inner side edge K of the side edge of the positive electrode sheet 411 in the first stack of cells 41, and the interval 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 double-sided adhesive tape, or other materials or components that can fixedly connect the lowermost positive electrode sheet of the first stack of cells 41 and the uppermost positive electrode sheet of the second stack of cells 42.

[0056] It should be noted that the first gap 163 and the second adhesive layer 43 at the bottom of the first core 41 are separated by a distance L5. The purpose of this is to cover the second adhesive layer 43 inside the battery body with the surface adhesive paper outside the battery body, so as to avoid wrinkles or protrusions of the aluminum plastic film at the second adhesive layer 43, thereby avoiding damage to the wrinkles or protrusions during battery installation and causing battery leakage. Therefore, the above-mentioned interval distance L5 is at least greater than 0.2mm. In addition, the interval distance L5 cannot exceed 2mm, because too much adhesive layer will cause the battery to occupy too much space in the battery compartment.

[0057] Please refer to FIG. 1 and FIG. 3, and FIG. 10 to FIG. 12, in the specific implementation, the battery provided by the application further includes a top sealing edge 13, a tab 14, a protection plate 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; the tab 14 is extended from the outer end of the top sealing edge 13 at the junction of the fourth side and the second top surface area 202, and is connected with the protection plate 18, that is, the tab 14 is extended from the top area with thicker thickness of the battery, and there is no tab output in the top area with thinner thickness of the battery; the head adhesive layer 15 covers the connection between the tab 14 and the protection plate 18; the first side sealing edge 11 is located at the first side (i.e. the left side in FIG. 1) of the battery body, because the thickness of the battery at this side is thinner, so the first side sealing edge 11 can adopt an outer turning double-folded edge structure; the second side sealing edge 12 is located at the third side (i.e. the right side in FIG. 1) of the battery body, because the thickness of the battery at this side is thicker, so the second side sealing edge 12 can adopt an inner turning double-folded edge structure.

[0058] Specifically, please refer to FIG. 11, the "outer turning" referred to in this paper means turning in the direction away from the battery body. The outer turning double-folded edge structure includes a first sealing edge layer 111 and a second sealing edge layer 112 arranged in layers, wherein: the first sealing edge layer 111 is attached to the first side of the battery body; the first side edge of the first sealing edge layer 111 is connected with the packaging film layer of the fourth side of the battery body, the second side edge opposite to the first side edge in the first sealing edge layer 111 is connected with the second sealing edge layer 112, and the second sealing edge layer 112 is turned outward from the second side edge of the first sealing edge layer 111 and attached to the outer side of the first sealing edge layer 111.

[0059] Furthermore, referring to FIG. 12, the "inward folding" referred to herein means folding towards the direction close to the main body of the battery cell. The inward folding double folding edge structure includes a third edge sealing layer 121 and a fourth edge sealing layer 122 arranged in layers, wherein: the third edge sealing layer 121 is located outside the third side of the main body of the battery cell; the third side of the third edge sealing layer 121 is connected to the wrapping film layer of the fourth side of the main body of the battery cell, the fourth side opposite to the third side in the third edge sealing layer 121 is connected to the fourth edge sealing layer 122, and the fourth edge sealing layer 122 is located between the inner side of the third edge sealing layer 121 and the third side of the main body of the battery cell after being folded inward from the fourth side of the third edge sealing layer 121.

[0060] It should be noted that the first side edge sealing 11 and the second side edge sealing 12 are respectively provided with different folding processes, which are aimed at ensuring that the folding edge does not protrude from the main body of the battery cell. The second side edge sealing 12 with the inward folding double folding edge structure is located at the second side of the battery cell with a relatively large thickness, which can play an insulating role at this position and ensure the inward bending space and the glue space required by the inward folding mode, thereby avoiding the problem of protruding from the surface of the battery cell due to the thin thickness of the battery cell. In addition, the first side edge sealing 11 located at the first side of the battery cell with a relatively small thickness is provided with an outward folding double folding edge structure, which can solve the problem of the shallow pit step size required by the inward folding of the edge sealing. It should be noted that since the first side edge sealing 11 is in a non-insulating state when it is folded outward, the first side edge sealing 11 needs to be wrapped with insulating paper or coated with UV glue (also known as shadowless glue or photosensitive glue) for insulation.

[0061] Finally, it should be noted that the relationship terms such as first and second in the present disclosure 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 the entities or operations. Furthermore, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0062] The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between various embodiments can be referred to each other.

[0063] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery comprising a cell body, characterized by, Also comprising a bottom adhesive layer (16) and a head adhesive layer (15), wherein: The cell body comprises 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 connected in sequence and end-to-end circumferentially 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) comprises a first side surface area (101), an elevation area (103), and a second side surface area (102) connected in sequence, and 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 cell body and is provided with a first notch (163) at a position close to or corresponding to the elevation area (103); The head adhesive layer (15) is located at the top of the cell body and is provided with a second notch (153) at a position close to or corresponding to the elevation area (103).

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

3. The battery of claim 2, wherein, The second ear folding area (162) covers the bottom of the elevation 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 elevation area (103) is L2, and the value range of L2 satisfies 2mm≥L2>0.2mm.

4. The battery according to claim 2 or 3, characterized in that, The first ear folding area (161) and / or the second ear folding area (162) are provided with a third notch (164), wherein: In a first direction (z) parallel to the length direction of the elevation area (103), the gap distance between the inner bottom side of the third notch (164) and the bottom side of the first adhesive layer (17) located on the second side surface of the cell body is L1, and the value range of L1 satisfies 6mm≥L1≥0.5mm; And / or, in a second direction (x) perpendicular to the length direction of the elevation 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, and the value range of L4 satisfies 5mm≥L4≥0.5mm.

5. The battery according to any one of claims 1 to 3, wherein The first notch (163) is a U-shaped notch (163A), and the opening direction of the U-shaped notch (163A) is parallel to the length direction of the elevation area (103); Alternatively, the bottom of the first notch (163) is a circular notch (163B) or an oval notch (163C) or a strip-shaped hole-shaped notch (163D), the top of the first notch (163) and the bottom are communicated by a cut seam (Q), and the extension direction of the cut seam (Q) is parallel to the length direction of the facade area (103).

6. The battery according to any one of claims 1 to 3, wherein The bottom adhesive layer (16) includes a first adhesive layer main area (160) covering the bottom surface (30), and a fifth ear folding area (165) folded to the first side surface with respect to the first adhesive layer main area (160) and a sixth ear folding area (166) folded to the third side surface with respect to the first adhesive layer main area (160).

7. The battery according to any one of claims 1 to 3, wherein The head adhesive layer (15) includes a second adhesive layer main area (150) covering the top surface (20), and a third ear folding area (151) folded to the top of the first side surface area (101) with respect to the second adhesive layer main area (150) and a fourth ear folding area (152) folded to the top of the second side surface area (102) with respect to the second adhesive layer main area (150); the second notch (153) is located between the third ear folding area (151) and the fourth ear folding area (152).

8. The battery of claim 7, wherein, 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 ear folding area (151) and the fourth ear folding area (152) and the facade area (103) is L3, and the value range of L3 satisfies 12mm≥L3>0.

9. The battery of any one of claims 1-3, wherein, The cell main body includes a first stacked core (41) and a second stacked core (42) arranged in a stacked manner along the cell thickness direction (y) inside, 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), so as to constitute 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), the two ends of the second bonding layer (43) respectively exceed the two ends of the positive electrode sheet in the first stacked core (41), and the first notch (163) is located between the first side surface area (101) and the second bonding layer (43) with a spacing distance L5, and the value range of L5 satisfies 2mm≥L5>0.2mm.

10. The battery of any one of claims 1-3, wherein, Further comprising a tab (14) extending from the outer end of the top sealing edge (13) at the intersection 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) including an outwardly folded double-folded edge structure; the third side surface is provided with a second side sealing edge (12) including an inwardly folded double-folded edge structure.

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