Battery

Abstract

The utility model discloses a battery. A battery cell main body of the battery comprises a first side surface, a second side surface, a third side surface and a fourth side surface which are sequentially connected end to end in the circumferential direction. A step surface is arranged on the second side surface of the battery cell main body and comprises a first side surface area, a vertical surface area and a second side surface area which are connected in sequence; the cell thickness of the area where the first side area is located is smaller than that of the area where the second side area is located; the first side surface of the battery cell main body is provided with a first side sealing edge with an outwards-turned double-edgefold structure, and the third side surface of the battery cell main body is provided with a second side sealing edge with an inwards-turned double-edgefold structure. Therefore, the side surface of the battery provided by the utility model is provided with the step structure which can be matched with a battery compartment structure with a local bulge, 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 electrochemistry technology, 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, and the bottom surface of the whole machine's battery compartment may have local protrusions due to the layout of main board components and other reasons. 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 the battery compartment structure with local protrusions.

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

[0005] A battery includes a battery core main body, tabs, and a protection board. The battery core main 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. Among them:

[0006] The second side surface is provided with a stepped surface, and the stepped surface includes a first side surface area, a vertical surface area, and a second side surface area that are sequentially connected; in a first direction perpendicular to the fourth side surface, the first battery core thickness of the area where the first side surface area is located is less than the second battery core thickness of the area where the second side surface area is located;

[0007] The first side surface is provided with a first side seal, and the first side seal includes an outward - turned double - folded edge structure;

[0008] The third side surface is provided with a second side seal, and the second side seal includes an inward - turned double - folded edge structure;

[0009] The tab extends from the top surface and is connected to the protection board.

[0010] Optionally, in the above - mentioned battery, the first side seal includes a first main body area and a first extended area, where:

[0011] The first main body area is adhesively connected to the first side surface;

[0012] In a second direction perpendicular to the top surface, the first extended area extends relative to the first main body area outside the top surface.

[0013] Optionally, in the above - mentioned battery, the second side seal includes a second main body area and a second extended area, where:

[0014] The second main body area is adhesively connected to the third side surface;

[0015] In a second direction perpendicular to the top surface, the second extended region extends relative to the second main body region outside the top surface.

[0016] Optionally, in the above battery, a first inner turned-up tab is provided in the first extended region, and in the first direction, the thickness dimension of the first inner turned-up tab is smaller than the thickness of the first battery cell.

[0017] Optionally, in the above battery, the first inner turned-up tab has a double-folded edge structure and is attached to the top surface of the battery cell main body.

[0018] Optionally, in the above battery, a second inner turned-up tab is provided in the second extended region, and in the first direction, the thickness dimension of the second inner turned-up tab is smaller than the thickness of the second battery cell.

[0019] Optionally, in the above battery, the second inner turned-up tab has a double-folded edge structure and is attached to the top surface of the battery cell main body.

[0020] Optionally, in the above battery, it further includes a top sealing edge:

[0021] The bottom end of the top sealing edge is located at the junction of the fourth side surface and the top surface;

[0022] The outer end of the tab is located outside the top end of the top sealing edge.

[0023] Optionally, in the above battery, it further includes a top sealing insulator;

[0024] The first extended region, the top sealing edge, and the second extended region are all attached and connected to the side surface of the top sealing insulator.

[0025] Optionally, in the above battery, the top sealing insulator is a flexible insulating paper, wherein:

[0026] A first combined inner turned-up tab is provided at one end of the first combined part formed by the top sealing insulator and the first extended region, which is far from the top sealing edge;

[0027] And / or, a first combined inner turned-up tab is provided at one end of the second combined part formed by the top sealing insulator and the second extended region, which is far from the top sealing edge.

[0028] Optionally, in the above battery, the first combined part is attached to the top surface;

[0029] And / or, the second combined part is attached to the top surface.

[0030] Optionally, in the above battery, the top surface includes:

[0031] A first top surface region, which is adjacent to the first side surface region;

[0032] A second top surface region, which is adjacent to the second side surface region;

[0033] At least a buffer pad is provided between at least the second top surface region and the protection plate.

[0034] Optionally, in the above battery, the number of components in the region of the protection plate corresponding to the first top surface region is greater than the number of components in the region of the protection plate corresponding to the second top surface region.

[0035] Optionally, in the above battery, an adhesive material is further included;

[0036] At least a part of the region outside the temperature sensing region of the negative temperature coefficient thermistor provided in the protection plate is connected to the top surface through the adhesive material.

[0037] Optionally, in the above battery, the protection plate includes a flexible circuit board and a reinforcing plate.

[0038] Optionally, in the above battery, the protection plate is provided with a negative temperature coefficient thermistor, and the negative temperature coefficient thermistor is located at one end of the protection plate close to the first side seal.

[0039] Optionally, in the above battery, the output end of the protection plate is located at one end of the protection plate close to the second side seal.

[0040] It can be seen from the above technical solutions that the battery provided by the present application has a stepped structure on the side. The area with a thinner thickness of the battery cell in the stepped structure 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. Thus, 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 at the whole machine end and increasing the battery capacity. Description of the Drawings

[0041] 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 the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0042] Figure 1 It is a front view of a battery cell main body provided by an embodiment of the present application.

[0043] Figure 2 It is a schematic top view structure of a battery cell main body provided by an embodiment of the present application.

[0044] Figure 3 is Figure 2 an enlarged view of area M in

[0045] Figure 4 is Figure 2 an enlarged view of area N in

[0046] Figure 5 is a schematic exploded view of a cell main body and a top insulator provided by an embodiment of the present application.

[0047] Figure 6 is a schematic combined view of a cell main body and a top insulator provided by an embodiment of the present application.

[0048] Figure 7 is a schematic view of a structure of a first combined inwardly folded ear provided by an embodiment of the present application.

[0049] Figure 8 is a schematic view of a structure of a second combined inwardly folded ear provided by an embodiment of the present application.

[0050] Figure 9 is a schematic view of the installation position of an insulating pad on the top of a cell main body provided by an embodiment of the present application.

[0051] Figure 10 is a schematic view of the positional correspondence between a protection board and an adhesive material provided by an embodiment of the present application.

[0052] Figure 11 is a schematic exploded view of a battery provided by an embodiment of the present application.

[0053] Wherein:

[0054] 10 - stepped surface, 101 - first side region, 102 - second side region, 103 - vertical surface region,

[0055] 201 - first top region, 202 - second top region,

[0056] 11 - first side seal, 111 - first main body region, 112 - first extended region,

[0057] 1101 - first seal layer, 1102 - second seal layer,

[0058] 12 - second side seal, 121 - second main body region, 122 - second extended region,

[0059] 1201 - third seal layer, 1202 - fourth seal layer,

[0060] 13 - top seal, 14 - tab, 15 - top seal insulator,

[0061] 161 - The first combined inward - folding ear, 162 - The second combined inward - folding ear,

[0062] 17 - Adhesive material, 18 - Protective plate, 181 - Output terminal, 182 - Negative temperature coefficient thermistor,

[0063] 19 - Buffer pad, 20 - Bottom insulator, 21 - First side insulator, 22 - Second side insulator. Detailed implementation manners

[0064] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part 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 of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0065] The embodiment of the present application provides a battery with a stepped structure. Please refer to Figures 1 to 4 , the battery includes a battery cell main body, a tab 14, and a protective plate 18. The battery cell main 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. Among them, the second side surface is the side where the stepped surface 10 is located (that is, Figure 1 the large surface shown in), the first side surface and the third side surface are respectively located on the left and right sides of the second side surface, and the fourth side surface is located opposite to the second side surface. Moreover, the tab 14 extends from the top surface and is connected to the protective plate 18.

[0066] Specifically, please refer to Figure 2 , 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, that is, the second side surface area 102 is located on one side of the first side surface area 101 and is connected to it through the vertical surface area 103. Among them, the second side surface area 102 protrudes outward relative to the first side surface area 101. Thus, in the first direction y perpendicular to the fourth side surface, the first battery cell thickness a of the area where the first side surface area 101 is located is less than the second battery cell thickness b of the area where the second side surface area 102 is located. Here, it should be noted that: the first battery cell thickness a of the area where the first side surface area 101 is located means that in the direction perpendicular to the plane where the first side surface area 101 is located (that is, Figure 2 the first direction y shown in), the battery cell thickness of the area where the first side surface area 101 is located is the first battery cell thickness a; in the direction perpendicular to the plane where the second side surface area 102 is located (that is, Figure 2 the first direction y shown in), the battery cell thickness of the area where the second side surface area 102 is located is the second battery cell thickness b, and b > a.

[0067] Furthermore, please refer to Figure 3, the first side of the battery cell body is provided with a first side edge seal 11, and the first side edge seal 11 includes an outward-turned double-folded edge structure. Specifically, the "outward-turned" mentioned in this article refers to folding in the direction away from the battery cell body. The outward-turned double-folded edge structure includes a first edge seal layer 1101 and a second edge seal layer 1102 arranged in a stacked manner, wherein: the first edge seal layer 1101 is bonded to the first side of the battery cell body; the first side of the first edge seal layer 1101 is connected to the coating film layer on the fourth side of the battery cell body, the second side of the first edge seal layer 1101 opposite to the first side is connected to the second edge seal layer 1102, and the second edge seal layer 1102 is folded outward from the second side of the first edge seal layer 1101 and bonded to the outer side of the first edge seal layer 1101.

[0068] See also Figure 4 , the third side surface of the battery cell body is provided with a second side edge seal 12, and the second side edge seal 12 includes an inward-turned double-folded edge structure. Specifically, the "inward-turned" mentioned in this article refers to folding in the direction close to the battery cell body. The inward-turned double-folded edge structure includes a third edge seal layer 1201 and a fourth edge seal layer 1202 arranged in a stacked manner, wherein: the third edge seal layer 1201 is located outside the third side surface of the battery cell body; the third side of the third edge seal layer 1201 is connected to the coating film layer on the fourth side surface of the battery cell body, the fourth side of the third edge seal layer 1201 opposite to the third side is connected to the fourth edge seal layer 1202, and the fourth edge seal layer 1202 is folded inward from the fourth side of the third edge seal layer 1201 and is located between the inner side surface of the third edge seal layer 1201 and the third side surface of the battery cell body.

[0069] It should be noted that the first side edge seal 11 and the second side edge seal 12 respectively adopt different folding processes, in order to ensure that the folded edge does not protrude from the main body of the battery cell. Among them, the second side edge seal 12 adopts an inward-turned double-folded edge structure and is located on the second side of the battery cell where the thickness is thicker. This can insulate the position and ensure the inner bending space and glue space required for the inward-turned method, avoiding the problem of the thin thickness of the battery cell causing the edge seal to protrude from the surface of the battery cell and cause excessive thickness. In addition, the first side edge seal 11 located on the first side of the battery cell where the thickness is thinner adopts an outward-turned double-folded edge structure, which can solve the shallow pit step size that needs to be superimposed when the edge seal is folded inward. It should be noted that since the first side edge seal 11 is in a non-insulated state when turned outward, the first side edge seal 11 needs to be insulated by wrapping insulating paper or applying UV glue (also called shadowless glue or photosensitive glue) to insulate.

[0070] It can be seen that the battery provided by the present application has a step structure on the side, and the thinner area of the cell in the step structure can be adapted to the raised area on the bottom of the battery compartment, and the other thicker areas of the cell can be installed normally 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 a local protrusion, which is conducive to improving the space utilization of the whole machine end and increasing the battery capacity.

[0071] Please refer to Figure 1 and Figure 2 , in some embodiments, the top of the battery cell main body provided by the present application further includes a top sealing edge 13. The bottom end of the top sealing edge 13 is located at the junction of the fourth side and the top surface, and in the second direction z perpendicular to the top surface of the battery cell main body, the top sealing edge 13 extends relative to the fourth side of the battery cell main body outside the top surface of the battery cell main body; moreover, the outer end of the tab 14 is located outside the top end of the top sealing edge 13.

[0072] Moreover, please refer to Figure 3 , the first side sealing edge 11 includes a first main body area 111 and a first extended area 112. Among them, the first main body area 111 is adhesively connected to the first side of the battery cell main body; in the second direction z perpendicular to the top surface of the battery cell main body, the first extended area 112 extends relative to the first main body area 111 outside the top surface of the battery cell main body. Correspondingly, please refer to Figure 4 , the second side sealing edge 12 includes a second main body area 121 and a second extended area 122. Among them, the second main body area 121 is adhesively connected to the third side of the battery cell main body; in the second direction z perpendicular to the top surface of the battery cell main body, the second extended area 122 extends relative to the second main body area 121 outside the top surface of the battery cell main body.

[0073] Further, in some embodiments, to reduce the thickness of the battery head, a dog-ear structure formed by folding and pressing downward in a direction close to the center of the battery cell is provided at least on the first extended area 112 on the side where the battery cell is thinner. This dog-ear structure is hidden in the battery cell top sealing groove and is smaller than the battery cell thickness. That is, the above-mentioned first extended area 112 is provided with a first inward folding ear ( Figure 3 not shown in the figure, but its specific structure is the same as that of Figure 7 the first combined inward folding ear 161 shown in Figure 8 and the second combined inward folding ear 162 shown in

[0074] Similarly, in some embodiments, the above-mentioned second extended area 122 is provided with a second inward folding ear ( Figure 3 not shown in the figure, but its specific structure is the same as that of Figure 7 the first combined inward folding ear 161 shown in Figure 8The second combined inwardly folded ear 162 shown in [reference] is basically similar, and in the first direction y, the thickness dimension of the second inwardly folded ear is smaller than the second cell thickness b. Further, the second inwardly folded ear has a double-folded edge structure (i.e., an ear structure formed by two consecutive inward folding processes), and is attached to the top surface of the cell body.

[0075] Further, please refer to Figure 5 and Figure 6 , the first extended area 112 of the first side seal 11, the top seal 13, and the second extended area 122 of the second side seal 12 are all attached to and connected with the side surface of the top seal insulator 15, so as to be wrapped and insulated by the top seal insulator 15. In addition, please refer to Figure 11 , in the battery provided by the present application, the bottom of the cell body is wrapped and insulated by the bottom insulator 20, and both sides of the cell body (i.e., the first side surface and the third side surface) are respectively wrapped and insulated by the first side insulator 21 and the second side insulator 22.

[0076] During specific implementation, to avoid the above-mentioned first and second inwardly folded ears from having uncut edges, after wrapping and insulating them with the top seal insulator 15, the dog ears are pressed. At this time, the top seal insulator 15 can be made of flexible insulating paper. Specifically, after top-sealing and insulating the cell with the top seal insulator 15, to avoid the head from being too thick and reduce the head thickness, the dog ear of the first side seal 11 located outside the first side surface of the cell with a thinner thickness is folded, that is, the side dog ear of the first side seal 11 is pressed downward so that the dog ear is hidden in the top-sealing groove of the cell, and its height is less than the cell thickness. Further, the dog ear of the second side seal 12 can also be folded. Specifically, please refer to Figure 7 , at one end of the first combined part formed by the top seal insulator 15 and the first extended area 112 away from the top seal 13, a first combined inwardly folded ear 161 is provided, and after the first combined inwardly folded ear 161 is folded towards the cell, it is attached to the inner side surface of the first extended area 112. Similarly, a first combined inwardly folded ear 161 can also be provided at one end of the second combined part formed by the top seal insulator 15 and the second extended area 122 away from the top seal 13, and after the first combined inwardly folded ear 161 is folded towards the cell, it is attached to the inner side surface of the second extended area 122.

[0077] Further, please refer to Figure 8 , the first extended area 112 of the first side seal 11 and the second extended area 122 of the second side seal 12 are respectively provided with a dog ear structure with double-folded edges, that is, after the first combined inwardly folded ears 161 are respectively provided on the first extended area 112 of the first side seal 11 and the second extended area 122 of the second side seal 12, they are further folded twice towards the center of the cell. To avoid the outer-folded edge dog ears from having uncut edges, after wrapping and insulating the cell top seal 15 with insulating paper, the dog ears are pressed. Specifically, please refer toFigure 8 , the first side seal 11 is bent inwards at the junction of the first side surface and the top surface of the battery cell body, so that the first combination part formed by the top seal insulator 15 and the first extended area 112 is attached to the top surface of the battery cell body, thereby forming Figure 8 the second combined inner folding ear 162 shown in. Similarly, the second side seal 12 can also be bent inwards at the junction of the third side surface and the top surface of the battery cell body, so that the second combination part formed by the top seal insulator 15 and the second extended area 122 is attached to the top surface of the battery cell body, forming the second combined inner folding ear 162.

[0078] In some embodiments, in order to improve the reliability of the battery, a buffer pad 19 (such as a silica gel pad) is provided between the protection board 18 and the top surface of the battery cell body. Moreover, it is preferably to arrange the buffer pad 19 in the second top surface area 202 where the thickness of the battery cell is relatively large. Specifically, please refer to Figure 9 and Figure 11 , in the battery provided by the present application, the top surface of the battery cell body includes a first top surface area 201 and a second top surface area 202. Among them, the first top surface area 201 is located at the top of the first side surface area 101 and is connected thereto, and the second top surface area 202 is located at the top of the second side surface area 102 and is connected thereto. The buffer pad 19 is only located between the second top surface area 202 and the protection board 18. During specific implementation, the buffer pad 19 can be made of foam, silica gel or any other buffer material. It should be noted here that since the tabs 14 are all located at the side of the second top surface area 202, only the buffer pad 19 needs to be provided on the second top surface area 202 to avoid damage to the tabs 14 caused by impact, which affects the charging and discharging of the battery (when the tabs are severely damaged, it may even cause short circuit between the positive and negative tabs). Preferably, the length of the buffer pad 19 in the third length direction x is greater than the total length covered by the two tabs 14 in this direction.

[0079] During specific implementation, since the thickness of the battery cell in the area of the first side surface area 101 is relatively thin and the width of the first top surface area 201 in the first direction y is relatively narrow, in most products, the width of the buffer pad 19 that can be placed on the first top surface area 201 in the first direction y often does not meet 1.8 mm, so it is easy to cause the buffer pad 19 to protrude significantly from the top surface of the battery cell body and is difficult to attach. However, it is not limited thereto. In some other embodiments, the buffer pad 19 can also cover the first top surface area 201 and the second top surface area 202 of the top surface of the battery cell body. At this time, if the first top surface area 201 allows a buffer pad 19 with a width of 1.8 mm to be placed, the buffer pad 19 can also be set in an L shape, or even cover the entire top surface of the battery cell body.

[0080] Please refer to Figure 10 and Figure 11, in some embodiments, the battery provided by the present application further includes an adhesive material 17. Specifically, the adhesive material 17 may be a double-sided adhesive DuPont insulation paper (a type of double-sided tape) or other adhesive materials with similar functions. Preferably, the protection board 18 is fixed on the top of the battery cell through the adhesive material 17. Among them, the adhesive material 17 is provided in both the first top surface area 201 with a smaller battery cell thickness and the second top surface area 202 with a larger battery cell thickness. However, in order to improve the accuracy of the negative temperature coefficient thermistor 182, the temperature sensing area of the negative temperature coefficient thermistor 182 (i.e., NTC) provided in the protection board 18 is not covered by the adhesive material 17. That is to say, at least a part of the area outside the temperature sensing area of the negative temperature coefficient thermistor 182 provided in the protection board 18 is fixedly connected to the top surface of the battery cell body through the adhesive material 17, and the adhesive material 17 avoids the area where the negative temperature coefficient thermistor 182 (i.e., NTC, full English name Negative Temperature Coefficient) in the protection board 18 is located.

[0081] In some embodiments, in order to avoid the excessive thickness of the battery top, the protection board 18 adopts a structure form of a flexible circuit board + a reinforcing board. Among them, most of the components in the protection board 18 are located in the area corresponding to the first top surface area 201. Moreover, the protection board 18 is provided with a negative temperature coefficient thermistor 182 (i.e., NTC), and the negative temperature coefficient thermistor 182 is located at one end of the protection board 18 close to the first side seal 11; the FPC (full English name Flexible Printed Circuit, that is, a flexible circuit board, or also called a printed circuit board) output terminal 181 in the protection board 18 is located at one end of the protection board 18 close to the second side seal 12, away from the negative temperature coefficient thermistor 182.

[0082] Finally, it should also be noted that in this article, 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 such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0083] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0084] 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 apparent 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 these 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 battery cell main body, electrode tabs (14) and a protection board (18), characterized in that, The battery 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 that are sequentially connected end to end in a circumferential direction between the top surface and the bottom surface, where: 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; in a first direction (y) perpendicular to the fourth side surface, a first battery cell thickness (a) of the area where the first side surface area (101) is located is less than a second battery cell thickness (b) of the area where the second side surface area (102) is located; The first side surface is provided with a first side seal edge (11), and the first side seal edge (11) includes an outwardly turned double-folded edge structure; The third side surface is provided with a second side seal edge (12), and the second side seal edge (12) includes an inwardly turned double-folded edge structure; The tab (14) extends from the top surface and is connected to the protection plate (18).

2. The battery according to claim 1, wherein, The first side seal edge (11) includes a first main body area (111) and a first extended area (112), where: The first main body area (111) is adhesively connected to the first side surface; In a second direction (z) perpendicular to the top surface, the first extended area (112) extends relative to the first main body area (111) outside the top surface; and / or The second side seal edge (12) includes a second main body area (121) and a second extended area (122), where: The second main body area (121) is adhesively connected to the third side surface; In a second direction (z) perpendicular to the top surface, the second extended area (122) extends relative to the second main body area (121) outside the top surface.

3. The battery according to claim 2, wherein, The first extended area (112) is provided with a first inwardly turned folding ear, and in the first direction (y), a thickness dimension of the first inwardly turned folding ear is less than the first battery cell thickness (a); and / or The second extended area (122) is provided with a second inwardly turned folding ear, and in the first direction (y), a thickness dimension of the second inwardly turned folding ear is less than the second battery cell thickness (b).

4. The battery according to claim 3, wherein, The first inwardly turned folding ear is a double-folded edge structure and is in contact with the top surface of the battery cell body; and / or The second inwardly turned folding ear is a double-folded edge structure and is in contact with the top surface of the battery cell body.

5. The battery according to claim 2, characterized in that, It further includes a top seal edge (13): The bottom end of the top seal edge (13) is located at the junction of the fourth side surface and the top surface; The outer end of the tab (14) is located outside the top end of the top seal edge (13).

6. The battery according to claim 5, characterized in that, It further includes a top seal insulator (15); The first extended area (112), the top seal edge (13), and the second extended area (122) are all adhesively connected to the side surface of the top seal insulator (15).

7. The battery according to claim 6, characterized in that, The top seal insulator (15) is a flexible insulating paper, where: One end of a first combined part formed by the top seal insulator (15) and the first extended area (112) that is far from the top seal edge (13) is provided with a first combined inwardly turned folding ear (161); And / or, a first combined inner turned-over ear (161) is provided at one end of a second combined part formed by fitting the top-sealing insulator (15) and the second extended region (122), which is far from the top-sealing edge (13).

8. The battery according to claim 7, wherein, The first combined part is in contact with the top surface; And / or, the second combined part is in contact with the top surface.

9. The battery according to claim 1, characterized in that, The top surface includes: A first top surface region (201) connected to the first side surface region (101); A second top surface region (202) connected to the second side surface region (102); At least a buffer pad (19) is provided between at least the second top surface region (202) and the protection plate (18).

10. The battery according to claim 9, characterized in that, The number of components in the region of the protection plate (18) corresponding to the first top surface region (201) is greater than the number of components in the region of the protection plate (18) corresponding to the second top surface region (202).

11. The battery according to claim 1, characterized in that, A bonding material (17) is further included; At least a part of the region outside the temperature-sensing region of the negative temperature coefficient thermistor (182) provided in the protection plate (18) is connected to the top surface through the bonding material (17).

12. The battery according to any one of claims 1 to 11, characterized in that, The protection plate (18) includes a flexible circuit board and a reinforcing plate; And / or, the protection plate (18) is provided with a negative temperature coefficient thermistor (182), and the negative temperature coefficient thermistor (182) is located at one end of the protection plate (18) close to the first side-sealing edge (11); And / or, the output end (181) of the protection plate (18) is located at one end of the protection plate (18) close to the second side-sealing edge (12).

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