Energy storage device and electric equipment

Abstract

The utility model discloses an energy storage device and electric equipment, the energy storage device comprises a naked battery cell, a plurality of tabs, a first adhesive film and a second adhesive film, the naked battery cell comprises a first surface and a second surface which are opposite to each other in a first direction, and the first direction is the thickness direction of the naked battery cell; the plurality of tabs are sequentially arranged in the first direction and are connected with the end surface of the naked battery cell in the second direction, and the second direction is perpendicular to the first direction; the first adhesive film comprises a first area and a second area which are connected, the first area is attached to the first surface, and the second area is attached to the tab; the second adhesive film comprises a third area and a fourth area which are connected, the third area is attached to the second surface, and the fourth area is attached to the tab. Through the arrangement, dislocation movement of the pole piece relative to the diaphragm caused by pulling the pole piece by the pole lug can be reduced or even avoided, so that short circuit caused by contact of the positive pole piece and the negative pole piece in the naked battery cell can be avoided, abnormality of an overhang area of the naked battery cell can also be avoided, and the risk of lithium precipitation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to an energy storage device and electrical equipment. Background Art

[0002] The energy storage device usually includes a shell, bare battery cells, tabs, end cover assemblies, etc. During assembly, the tabs extended from the bare battery cells are bent and connected to the end cover assemblies to form a whole. The bare battery cells and tabs are then extended into the shell from the opening of the shell, and then the end cover assemblies are connected to the shell to close the space inside the shell.

[0003] The bending of the tabs during energy storage device assembly can cause the tabs to be pulled. The expansion of the bare cell during operation can also cause the tabs to be pulled. This can cause the tabs in the bare cell connected to the tabs to shift relative to the separator. This shifting of the tabs can cause the positive and negative tabs in the bare cell to short-circuit, or it can cause abnormalities in the overhang area of ​​the bare cell, posing a high risk of lithium deposition. Utility Model Content

[0004] The purpose of the utility model is to provide an energy storage device and an electrical device to solve the problem of pole piece misalignment caused by pole tabs pulling pole pieces.

[0005] In order to achieve the purpose of the present invention, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides an energy storage device, comprising:

[0007] A bare battery cell, comprising a first surface and a second surface opposite to each other in a first direction, wherein the first direction is a thickness direction of the bare battery cell;

[0008] A plurality of tabs are sequentially arranged in the first direction and connected to the end surface of the bare cell in the second direction, wherein the second direction is perpendicular to the first direction;

[0009] A first adhesive film includes a first region and a second region connected to each other, wherein the first region is attached to the first surface, and the second region is attached to the tab adjacent to the first surface;

[0010] The second adhesive film includes a third region and a fourth region connected to each other, wherein the third region is attached to the second surface, and the fourth region is attached to the tab adjacent to the second surface.

[0011] By setting a first adhesive film and a second adhesive film, the first area of ​​the first adhesive film is attached to the first surface of the bare battery cell, the second area is attached to the pole ear, the third area of ​​the second adhesive film is attached to the second surface of the bare battery cell, and the fourth area is attached to the pole ear. The bare battery cell and the pole ear can be relatively fixed, which can reduce or even avoid the pole ear pulling the pole piece, causing the pole piece to be dislocated and moved relative to the diaphragm, thereby avoiding the positive and negative pole pieces in the bare battery cell from contacting to form a short circuit, and also avoiding abnormalities in the overhang area of ​​the bare battery cell, thereby reducing the risk of lithium plating.

[0012] In one embodiment, a plurality of the tabs are connected to form a tab member, the tab member including a lead-out portion, a bend portion, and a connection portion. The lead-out portion is connected to the bare cell, the end of the lead-out portion away from the bare cell is connected to the bend portion, the end of the bend portion away from the lead-out portion is connected to the connection portion, the connection portion extends toward the second surface, and the first adhesive film and the second adhesive film are attached to the surface of the tab member; there are multiple bare cells, and the multiple bare cells are arranged in sequence along the first direction. The energy storage device also includes a connecting piece, the connecting piece is connected to the surface of the connection portion facing the bare cell, the tab member connected to two adjacent bare cells is connected to the same connecting piece, and the second surface of any bare cell connected to the same connecting piece is opposite to the other bare cell, and the fourth region is in contact with the connecting piece. The fourth region of the second adhesive film is in contact with the connecting piece, and the second adhesive film can protect the tab and prevent damage to the tab.

[0013] In one embodiment, the fourth region further extends beyond the side surface of the connecting piece. This configuration can enhance the protection capability of the tab.

[0014] In one embodiment, the second adhesive film is a high-temperature-resistant tape. The second adhesive film is used to contact the connecting tab. This means that the connecting tab is welded closer to the second adhesive film and therefore withstands higher temperatures. Therefore, using this type of tape ensures reliable bonding. Furthermore, the second adhesive film provides thermal insulation, preventing heat from welding the connecting tab from causing the separator to shrink, potentially leading to contact and a short circuit between the positive and negative electrodes.

[0015] In one embodiment, the first region has a dimension L1 from an end distal to the second region to an end connected to the second region, the second region has a dimension L2 from an end distal to the first region to an end connected to the first region, the third region has a dimension L3 from an end distal to the fourth region to an end connected to the fourth region, and the fourth region has a dimension L4 from an end distal to the third region to an end connected to the third region, satisfying the following: 1 / 4 ≤ L2 / L1 ≤ 4 / 5, and 1 / 4 ≤ L4 / L3 ≤ 4 / 5. In the direction of the tab lead-out, the dimensions of the first and second adhesive films attached to the surface of the bare cell are larger than those attached to the tab. This ensures a strong connection between the first and second adhesive films and the bare cell, while also ensuring a stable connection to the tab. It also prevents the first and second films from being too large on the tab, placing them too close to the welding area and potentially causing anomalies. In addition, the diaphragm will have an end position, which is located at the outermost side in the stacking direction of the electrodes in the laminated battery cell. When the adhesive film is attached to the diaphragm, it is also attached to the surface in the thickness direction of the bare battery cell. The adhesive film can play a role in reinforcing the end position of the diaphragm.

[0016] In one embodiment, L1 of the first adhesive film is different from L3 of the second adhesive film, so as to adapt to different pulling forces caused by different bending degrees at the end connected to the bare cell when the tab is welded together.

[0017] In one embodiment, in the first direction, the bent portion is closer to the first surface than the second surface, and L1 of the first adhesive film is greater than L3 of the second adhesive film. For multiple tabs on a bare cell, they are offset toward the first surface when welded together, resulting in a smaller curvature near the first surface and a larger curvature near the second surface. Combined with the above description, a larger L1 can prevent the outer tabs near the first surface from being severely pulled, thereby damaging the bare cell structure. This arrangement allows for stacking multiple bare cells while reducing the misalignment of the pole pieces caused by the pulling action between each tab and the pole piece.

[0018] In one embodiment, L2 of the first adhesive film is smaller than L4 of the second adhesive film, so that the fourth area of ​​the second adhesive film can contact the connecting sheet.

[0019] In one embodiment, the tab has a welding region. A distance d1 between the end of the second region distal to the first region and the welding region is greater than or equal to 3 mm. A distance d2 between the end of the fourth region distal to the third region and the welding region is greater than or equal to 3 mm. The first adhesive film should be positioned a certain distance from the welding region, i.e., a distance d1 between the end of the second region distal to the first region and the welding region is greater than or equal to 3 mm, to prevent the high temperature of welding from affecting the adhesive film's adhesive properties. The second adhesive film should be positioned similarly to the first adhesive film.

[0020] In one embodiment, the first and second adhesive films each extend along a third direction, perpendicular to both the first and second directions. In the third direction, the dimensions of the first and second adhesive films are both smaller than the dimensions of the tab, and the distance W between the ends of the first and second adhesive films and the end of the tab satisfies the following: 2mm≤W≤10mm. This arrangement provides a reference point when applying the first and second adhesive films. For example, the parallelism of the edges of the first and second adhesive films in the third direction Z with the edges of the tab can be visually inspected to prevent deviation in the adhesive film application and ensure that the films are applied correctly.

[0021] In one embodiment, a through hole is provided at the junction of the first and second regions, with a diameter D of 1 mm to 5 mm. This through hole allows gas to escape through it, preventing further expansion caused by gas being unable to escape. The diameter D of the through hole is between 1 mm and 5 mm, a suitable size that ensures sufficient gas venting while maintaining the structural strength of the film.

[0022] In one embodiment, the number of through holes is multiple, and the through holes are sequentially spaced apart, with a spacing d3 between adjacent through holes of 8 mm to 12 mm. When the spacing d3 between adjacent through holes is 8 mm to 12 mm, the spacing size is moderate, ensuring the structural strength of the film while also allowing for sufficient venting.

[0023] In one embodiment, the plurality of tabs include a positive tab and a negative tab. The positive tab is connected to one end of the bare cell in the second direction, and the negative tab is connected to the other end of the bare cell in the second direction. The first adhesive film is attached to the first surface and the positive tab, another first adhesive film is attached to the first surface and the negative tab, the second adhesive film is attached to the second surface and the positive tab, and another second adhesive film is attached to the second surface and the negative tab. In this way, the bare cell can be relatively fixed to the positive tab and the negative tab. A total of four adhesive films are attached between the bare cell and the positive tab and the negative tab, stably connecting and fixing the bare cell to the positive tab and the negative tab.

[0024] In a second aspect, the present invention further provides an electrical equipment, comprising an electrical device and an energy storage device according to any one of the various embodiments of the first aspect, wherein the energy storage device supplies power to the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation methods or the description of the prior art. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 is a partial structural perspective diagram of an energy storage device according to an embodiment;

[0027] Figure 2 This is a schematic structural diagram of a bare battery cell according to an embodiment;

[0028] Figure 3 is a plan view and a partially enlarged view of a structure of an energy storage device according to an embodiment;

[0029] Figure 4 is a side view of a partial structure of an energy storage device according to an embodiment;

[0030] Figure 5 yes Figure 4 A partial enlarged view of the M in the middle;

[0031] Figure 6 is a perspective view of a partial structure of an energy storage device in another state according to an embodiment;

[0032] Figure 7 A side view and a partially enlarged view of another state of a partial structure of an energy storage device according to an embodiment;

[0033] Figure 8 is a side view of stacked bare battery cells of an energy storage device according to an embodiment;

[0034] Figure 9 yes Figure 8 A local enlarged view of point N in the middle;

[0035] Figure 10 is an exploded diagram of an energy storage device according to an embodiment.

[0036] Description of reference numerals:

[0037] 10-bare cell, 11-first surface, 12-second surface, 13-pole sheet, 131-positive electrode sheet, 1311-positive electrode current collector, 1312-positive electrode active material layer, 132-negative electrode sheet, 1321-negative electrode current collector, 1322-negative electrode active material layer, 14-separator;

[0038] 20-pole ear, 21-positive pole ear, 22-negative pole ear, 23-welding area, 25-pole ear piece, 251-lead-out portion, 252-bending portion, 253-connecting portion;

[0039] 31 - first adhesive film, 311 - first region, 312 - second region, 32 - second adhesive film, 321 - third region, 322 - fourth region, 33 - through hole;

[0040] 40-connecting piece;

[0041] 50-end cover assembly, 51-pole, 52-explosion-proof valve;

[0042] 60-housing, 61-accommodating chamber. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0045] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meanings as commonly understood by those skilled in the art to which this utility model belongs. The terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more of the relevant listed items.

[0046] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0047] Please refer to Figure 1 and Figure 2 , Figure 1 It shows a three-dimensional view of the bare cell 10 and the tab 20 before they are welded together. Figure 2 The schematic diagram of the internal structure of a bare cell 10 according to an embodiment is shown. The embodiment of the present invention provides an energy storage device, including a bare cell 10, a plurality of tabs 20, a first adhesive film 31 and a second adhesive film 32.

[0048] The bare cell 10 is roughly in the shape of a rectangular parallelepiped as a whole. For the convenience of explanation, a coordinate system XYZ is established, in which the first direction X, the second direction Y and the third direction Z are perpendicular to each other, wherein the first direction X is the thickness direction of the bare cell 10, one of the second direction Y and the third direction Z is the length direction of the bare cell 10, and the other is the width direction of the bare cell 10. In other words, the second direction Y can be either the length direction or the width direction, and the same is true for the third direction Z. In the following text, the first direction X is the thickness direction of the bare cell 10, the second direction Y is the length direction of the bare cell 10, and the third direction Z is the width direction of the bare cell 10 as an example for explanation. It should be understood that the solution of the embodiment of the present utility model is also applicable to the case where the first direction X is the thickness direction of the bare cell 10, the second direction Y is the width direction of the bare cell 10, and the third direction Z is the length direction of the bare cell 10.

[0049] The bare cell 10 can be a wound cell or a laminated cell, without limitation. Figure 2 Taking the embodiment shown as an example, the bare cell 10 is a laminated cell, which includes a diaphragm 14 and a pole piece 13. The pole piece 13 includes a current collector and an active material layer arranged on the current collector. There are multiple pole pieces 13, and the multiple pole pieces 13 are arranged in sequence along their own thickness direction. The diaphragm 14 can be one or more; when the diaphragm 14 is one, the diaphragm 14 extends in a serpentine shape (also called a Z shape) and separates multiple pole pieces 13. This type of laminated cell is also called a Z-type laminated cell; when there are multiple diaphragms 14, two adjacent pole pieces 13 are separated by a diaphragm 14. The outermost pole piece 13 is also covered with a diaphragm 14, and the edge of the outermost diaphragm 14 can be overlapped to the diaphragm 14 at another adjacent pole piece 13. The bare cell 10 includes a first surface 11 and a second surface 12 opposite to each other in a first direction X. The first direction is the thickness direction of the bare cell 10. The plurality of pole pieces 13 are sequentially arranged in the first direction X (thickness direction of the bare cell 10 ) of the bare cell 10 .

[0050] The plurality of electrode sheets 13 include a positive electrode sheet 131 and a negative electrode sheet 132. The positive electrode sheet 131 includes a positive electrode current collector 1311 and a positive electrode active material layer 1312 disposed on the positive electrode current collector 1311. The negative electrode sheet 132 includes a negative electrode current collector 1321 and a negative electrode active material layer 1322 disposed on the negative electrode current collector 1321. One of the two adjacent electrode sheets 13 is the positive electrode sheet 131, and the other is the negative electrode sheet 132. The length and / or width dimensions of the positive electrode sheet 131 are smaller than the corresponding length and / or width dimensions of the negative electrode sheet 132. Along the length and / or width direction of the electrode sheet 13, the area on the negative electrode sheet 132 that exceeds the positive electrode sheet 131 is the overhang area. The width of the overhang area needs to meet certain conditions. If the width is too large or too small, an abnormality will occur, which will lead to a higher risk of lithium plating in the bare battery cell 10.

[0051] A plurality of tabs 20 are connected to the end face of the bare cell 10 in the second direction Y. The tab 20 can be an integral structure formed integrally with the current collector, or can be connected and fixed to the current collector by welding, bonding, etc. The end of the tab 20 away from the current collector extends from the end face of the pole piece 13, diaphragm 14, etc., that is, the tab 20 is led out from the end face of the bare cell 10 along the second direction Y, that is, the tab 20 is connected to the end face of the bare cell 10 in the second direction Y. It should be noted that there are also multiple tabs 20 and they are arranged in sequence in the first direction X, and the multiple tabs 20 are connected to the current collectors of the multiple pole pieces 13 in a one-to-one correspondence. The plurality of tabs 20 also include a positive tab 21 and a negative tab 22. The positive tab 21 is connected to the positive electrode sheet 131, and the negative tab 22 is connected to the negative electrode sheet 132. The positive tab 21 is led out from one end of the bare cell 10 in the second direction Y, and the negative tab 22 is led out from the other end of the bare cell 10 in the second direction Y. The following description will mainly focus on the positive tab 21 led out from one end of the bare cell 10, and the negative tab 22 will be used as a reference.

[0052] refer to Figure 6 and Figure 8 , Figure 6 The figure shows a stereoscopic view of the plurality of tabs 20 after being gathered and welded. After the plurality of tabs 20 are led out from the bare cell 10, the plurality of tabs 20 are bent and gathered and welded to form a whole, and then connected to the connecting piece 40.

[0053] refer to Figure 1 、 Figure 4 and Figure 5Before the tab 20 is bent, gathered, and welded, that is, when the tab 20 is in a flattened and straightened state, the length direction of the tab 20 is the width direction of the bare cell 10, i.e., the third direction Z. The width direction of the tab 20 is the length direction of the bare cell 10, i.e., the second direction Y. The thickness direction of the tab 20 is the thickness direction of the bare cell 10, i.e., the first direction X. In the orthographic projection along the width direction (the third direction X) of the bare cell 10, the tab 20 is in the shape of a straight line parallel to the electrode sheet 13. In this state, the lead-out direction of the tab 20 is roughly parallel to the plane where the electrode sheet 13 is located (i.e., the plane formed by the second direction Y and the third direction Z).

[0054] refer to Figures 5 to 7 When the multiple tabs 20 are bent, gathered, and welded to form a whole, the multiple tabs 20 are gathered along the first direction X of the bare cell 10, so that at least part of the tabs 20 are curved, and the curvature of the tabs 20 is greater the closer they are to the edge of the bare cell 10 in the first direction X. In the orthographic projection of the third direction Z, the tabs 20 are curved. In this state, the extension direction of the tabs 20 is the extension direction of the curve. The extension direction of the tabs 20 is perpendicular to the width direction (third direction Z) of the bare cell 10, but not perpendicular to the length direction (second direction Y) and thickness direction (first direction X) of the bare cell 10.

[0055] refer to Figures 7 to 10 After the multiple tabs 20 are gathered and welded to form a whole, the tabs 20 need to be connected to the connecting piece 40. After the whole formed by the multiple tabs 20 is connected to the connecting piece 40, the tabs 20 are bent, and the connecting piece 40 is welded to the pole 51 of the end cover assembly 50, so that the bare battery cell 10, the tabs 20, the connecting piece 40 and the end cover assembly 50 form a whole and are installed in the accommodating cavity 61 of the shell 60 of the energy storage device.

[0056] refer to Figure 5 and Figure 6 ,as well as Figure 8 and Figure 9 During the welding of the tabs 20, the tabs 20 will pull on each other. During subsequent use of the energy storage device, the bare cell 10 will expand, which will also pull on the tabs 20, causing the pole piece 13 and the separator 14 to shift position. The shift position is mainly in the longitudinal direction of the bare cell 10 (the second direction Y). The shift position of the pole piece 13 may cause the positive and negative electrode sheets 131 and 132 in the bare cell 10 to contact and short-circuit. It may also cause abnormalities in the overhang area of ​​the bare cell 10, posing a high risk of lithium deposition.

[0057] refer to Figure 1 、 Figure 4 and Figure 5To prevent the electrode 13 from shifting, the energy storage device of this embodiment of the present invention further includes a first adhesive film 31 and a second adhesive film 32. The first adhesive film 31 includes a first region 311 and a second region 312 connected to each other. The first region 311 is attached to the first surface 11, and the second region 312 is attached to the electrode tab 20 adjacent to the first surface 11. The second adhesive film 32 includes a third region 321 and a fourth region 322 connected to each other. The third region 321 is attached to the second surface 12, and the fourth region 322 is attached to the electrode tab 20 adjacent to the second surface 12.

[0058] The first adhesive film 31 and the second adhesive film 32 are thin film structures with adhesive properties. Specifically, they can be adhesive tape, PET (polyethylene terephthalate) film, etc., without limitation. The first adhesive film 31 and the second adhesive film 32 can be roughly rectangular when flattened and straightened. Of course, they can also be other shapes without limitation. The subsequent description mainly uses the rectangle as an example. A portion of the first adhesive film 31 and the second adhesive film 32 is bonded to the outer surface of the bare battery cell 10 in the thickness direction (i.e., the first direction X), which is the first area 311 and the third area 321. The remaining portions of the first adhesive film 31 and the second adhesive film 32 are used to bond to the tab 20, which is the second area 312 and the fourth area 322. It should be understood that the tabs 20 adjacent to the first surface 11 and adjacent to the second surface 12 are the two outermost tabs in the first direction X. Since there is a certain distance between the outermost tabs 20 in the first direction X and the outer surface of the bare cell 10 in the thickness direction, the second region 312 and the fourth region 322 will be partially suspended or attached to the end surface of the bare cell 10 in the second direction Y, and the rest will be attached to the tabs 20. The first region 311 and the second region 312, as well as the third region 321 and the fourth region 322 are bounded by the edges of the ends of the bare cell 10 in the second direction Y.

[0059] refer to Figure 1 、 Figure 4 and Figure 5 Before the tabs 20 are welded together, the first and second adhesive films 31, 32 are bonded together. After bonding, the first and second regions 311, 312 of the first adhesive film 31 are approximately coplanar, as are the third and fourth regions 321, 322 of the second adhesive film 32. The first and second adhesive films 31, 32 are approximately parallel to each other, and are now approximately flattened and straightened. The length of the first and second adhesive films 31, 32 corresponds to the width of the bare cell 10, or the third direction Z. The width of the first and second adhesive films 31, 32 corresponds to the length of the bare cell 10, or the second direction Y. The thickness of the first and second adhesive films 31, 32 corresponds to the thickness of the bare cell 10, or the first direction X.

[0060] refer to Figure 1 、 Figure 4 and Figure 5 Multiple tabs 20 are arranged sequentially in the thickness direction (i.e., the first direction X) of the bare cell 10, and the first adhesive film 31 and the second adhesive film 32 are attached to the outermost tabs 20 in the thickness direction (i.e., the first direction X) of the multiple tabs 20. In this way, the first and second portions of the first adhesive film 31 and the third and fourth portions of the second adhesive film 32 are attached to two components (i.e., the separator 14 and the tab 20) that may move relative to each other, thereby connecting and fixing the two components.

[0061] refer to Figure 1 According to the above description, the multiple tabs 20 include multiple positive tabs 21 and multiple negative tabs 22. The multiple positive tabs 21 are connected to one end of the bare cell 10 in the second direction Y, and the multiple negative tabs 22 are connected to the other end of the bare cell 10 in the second direction Y. In this embodiment, both ends of the bare cell 10 in the second direction Y and the two surfaces in the first direction X are affixed with adhesive films, for a total of four adhesive films. Specifically, a first adhesive film 31 is affixed to the first surface 11 and the positive tab 21, another first adhesive film 31 is affixed to the first surface 11 and the negative tab 22, a second adhesive film 32 is affixed to the second surface 12 and the positive tab 21, and another second adhesive film 32 is affixed to the second surface 12 and the negative tab 22. In this way, the relative fixation between the bare battery cell 10 and the positive electrode tab 21 and the negative electrode tab 22 can be achieved. A total of four adhesive films are attached between the bare battery cell 10 and the positive electrode tab 21 and the negative electrode tab 22, which can stably connect and fix the bare battery cell 10 and the positive electrode tab 21 and the negative electrode tab 22.

[0062] refer to Figure 6 and Figure 7 After the multiple tabs 20 are gathered and welded together, they form a connected and fixed whole. Through the aforementioned adhesive film, the bare battery cell 10 and the tabs 20 can be connected and fixed.

[0063] Combine Figure 1 and Figure 2 Since the electrode 13 is sandwiched between the diaphragms 14 and the tabs 20 are connected to the electrode 13, after the adhesive film is attached to the bare cell 10 and the tabs 20, the electrode 13 and the diaphragm 14 are relatively fixed. When the tabs 20 are pulled on the electrode 13 during welding or when the bare cell 10 expands during operation, the electrode 13 pulls on the tabs 20. Due to the fixing effect of the adhesive film, the electrode 13 and the diaphragm 14 are not easily displaced and can basically maintain a relatively fixed state.

[0064] Therefore, the energy storage device provided by the embodiment of the present invention, by setting the first adhesive film 31 and the second adhesive film 32, the first area 311 of the first adhesive film 31 is attached to the first surface 11 of the bare battery cell 10, the second area 312 is attached to the pole ear 20, the third area 321 of the second adhesive film 32 is attached to the second surface 12 of the bare battery cell 10, and the fourth area 322 is attached to the pole ear 20, can relatively fix the bare battery cell 10 and the pole ear 20, and can reduce or even avoid the pole ear 20 pulling the pole piece 13, causing the pole piece 13 to be misaligned and moved relative to the diaphragm 14, thereby avoiding the positive electrode piece 131 and the negative electrode piece 132 in the bare battery cell 10 from contacting to form a short circuit, and can also avoid abnormalities in the overhang area of ​​the bare battery cell 10, thereby reducing the risk of lithium plating.

[0065] In one embodiment, reference Figure 3 、 Figure 6 and Figure 9 The tab 20 has a welding area 23 , and a distance d1 between an end of the second area 312 away from the first area 311 and the welding area 23 is greater than or equal to 3 mm.

[0066] According to the above description, multiple tabs 20 will be welded together. The structure after welding can be referred to Figure 6 , and then the tab 20 will be connected to the connecting piece 40, such as Figure 8 and Figure 9 As shown. A plurality of tabs 20 are welded together in the welding area 23. The welding will generate high temperature, and the position close to the welding area 23 will also be affected by the high temperature. Therefore, the first adhesive film 31 needs to be set to a certain distance from the welding area 23, that is, the distance d1 between the end of the second area 312 away from the first area 311 and the welding area 23 is greater than or equal to 3mm, so as to avoid the high temperature of welding affecting the bonding performance of the adhesive film. d1 can be specifically 3mm, 4mm, 5mm, 6mm, etc., without limitation. When d1 is greater than or equal to 3mm, the high temperature generated during welding in the welding area 23 has less effect on the adhesive film, which can avoid the adhesive film material being heated and causing the adhesive ability to weaken, and further avoid the adhesive film from entering the welding area 23 due to the weakening of the adhesive ability of the adhesive film, thereby causing welding explosion points.

[0067] The second adhesive film 32 can be configured similarly to the first adhesive film 31, i.e., a distance d2 (not shown) between the end of the fourth region 322 away from the third region 321 and the welding area 23 is greater than or equal to 3 mm. The effects of the configuration of the first adhesive film 31 are described above and will not be further elaborated here.

[0068] In one embodiment, reference Figure 1 and Figure 3A through hole 33 may also be provided at the junction of the first region 311 and the second region 312 of the first adhesive film 31. The through hole 33 runs through the thickness direction of the first adhesive film 31, and its shape can be any feasible shape and is not limited. During operation, the bare cell 10 may produce gas internally, and the gas needs to be discharged in a timely manner to avoid accumulation inside the bare cell 10 and accelerated expansion or even explosion. Therefore, a through hole 33 is provided at the junction of the first region 311 and the second region 312 of the first adhesive film 31. The position of the junction corresponds to one end edge of the bare cell 10 in the second direction, and also corresponds to the gap between the edge and the outermost tab 20 in the thickness direction (first direction X) of the bare cell 10. When the bare cell 10 produces gas, the gas can be discharged from this position. By providing the through hole 33, the gas can be discharged through the through hole 33, avoiding the inability of the gas to be discharged and aggravated expansion. It is understandable that a through hole 33 may also be provided at the junction of the third region 321 and the fourth region 322 of the second adhesive film 32.

[0069] In one embodiment, reference Figure 1 and Figure 3 , the diameter D of the through hole 33 is 1mm-5mm. In this embodiment, the through hole 33 can be a circular hole, a regular polygon hole, etc., and its diameter refers to the diameter of a circle or the diameter of an inscribed circle of a regular polygon. The diameter D of the through hole 33 can specifically be 1mm, 2mm, 3mm, 4mm, 5mm, etc., without limitation. The diameter D of the through hole 33 is between 1mm and 5mm, which is of moderate size. It can fully vent while ensuring the structural strength of the film. If the diameter D of the through hole 33 is less than 1mm, the size is too small, which may lead to poor venting. If the diameter D of the through hole 33 is greater than 5mm, the size is too large, the structural strength of the film may be insufficient, and it may be easy to break.

[0070] In one embodiment, reference Figure 1 and Figure 3The number of through holes 33 is multiple, and the multiple through holes 33 are arranged in sequence at intervals, and the spacing d3 between adjacent through holes 33 is 8mm-12mm. The multiple through holes 33 of the first adhesive film 31 are all arranged at the junction of the first area 311 and the second area 312, and the multiple through holes 33 of the second adhesive film 32 are all arranged at the junction of the third area 321 and the fourth area 322, that is, the multiple through holes 33 are arranged in sequence at intervals in the third direction Z. The spacing d3 between adjacent through holes 33 is the closest distance in the third direction Z, and the spacing d3 can be 8mm, 9mm, 10mm, 11mm, 12mm, etc., without limitation. When the spacing d3 between adjacent through holes 33 is 8mm-12mm, the spacing size is moderate, and sufficient air can be exhausted while ensuring the strength of the adhesive film structure. If the spacing d3 between adjacent through holes 33 is less than 8mm, the spacing is too small, and the size of the adhesive film between two adjacent through holes 33 is small, which may lead to insufficient strength and easy breakage. If the distance d3 between adjacent through holes 33 is greater than 12 mm, the distance is too large, and the size of the adhesive film between two adjacent through holes 33 is too large, which may cause poor air discharge.

[0071] In one embodiment, reference Figure 1 and Figure 3 , the first adhesive film 31 and the second adhesive film 32 both extend along the width direction of the bare cell 10, that is, the length direction of the first adhesive film 31 and the second adhesive film 32 are both the third direction Z. In the third direction Z, the size of the first adhesive film 31 and the second adhesive film 32 are both smaller than the size of the tab 20, and the distance between the end of the first adhesive film 31 and the end of the second adhesive film 32 and the end of the tab 20 is W, satisfying: 2mm≤W≤10mm. W can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., without limitation. Such a setting can provide a reference when pasting the first adhesive film 31 and the second adhesive film 32. For example, the parallelism of the edges of the first adhesive film 31 and the second adhesive film 32 in the third direction Z with the edges of the tab 20 can be visually detected to avoid deviation of the adhesive film and ensure that the film is pasted in the correct position.

[0072] In one embodiment, reference Figure 1 、 Figures 3 to 5 The size of the first area 311 from the end away from the second area 312 to the end connected to the second area 312 is L1, the size of the second area 312 from the end away from the first area 311 to the end connected to the first area 311 is L2, the size of the third area 321 from the end away from the fourth area 322 to the end connected to the fourth area 322 is L3, and the size of the fourth area 322 from the end away from the third area 321 to the end connected to the third area 321 is L4, satisfying: 1 / 4≤L2 / L1≤4 / 5, 1 / 4≤L4 / L3≤4 / 5.

[0073] When multiple tabs 20 have not been welded together, refer to Figure 5 The tab 20 is in a flattened and straightened state, with its lead-out direction being the lengthwise direction of the bare cell 10 (i.e., the second direction Y). The dimension L1 of the first region 311 of the first adhesive film 31 is larger than the dimension L2 of the second region 312, and satisfies 1 / 4 ≤ L2 / L1 ≤ 1 / 3. The dimension L3 of the third region 321 of the second adhesive film 32 is larger than the dimension L4 of the fourth region 322. L2 / L1 and L4 / L3 can be specifically 1 / 4, 1 / 3.5, 1 / 3, etc., without limitation. The values ​​of L1, L2, L3, and L4 are not specifically limited. According to the above description, four adhesive films are attached between the bare battery cell 10 and the positive electrode tab 21 and the negative electrode tab 22, namely two first adhesive films 31 and two second adhesive films 32. The sizes of the four adhesive films in the lead-out direction of the tab 20 (i.e., the width of the adhesive film) may be equal or unequal, the values ​​of L2 / L1 of the two first adhesive films 31 may be equal or unequal, and the values ​​of L4 / L3 of the two second adhesive films 32 may be equal or unequal, which can be set as needed and are not limited here.

[0074] In the embodiment of the present invention, the dimensions of L1, L2, L3, and L4 refer to the width of the film in its naturally stretched state. The naturally stretched state does not only refer to a state without external force, but also refers to a state where the film is stretched under very small external force but does not undergo elastic deformation. Figure 1 The illustrated state of the adhesive film before the tabs 20 are gathered and welded is based on the following: the width of the first region 311 is L1, the width of the second region 312 is L2, the width of the third region 321 is L3, and the width of the fourth region 322 is L4. After the tabs 20 are gathered and welded, the dimensions L1, L2, L3, and L4 of the first and second adhesive films 31 and 32 remain essentially unchanged, or may increase slightly due to the pulling action, but can generally be considered to maintain their original dimensions.

[0075] The size of the first adhesive film 31 and the second adhesive film 32 attached to the surface of the bare battery cell 10 is larger than the size attached to the tab 20, which can make the connection stability of the first adhesive film 31 and the second adhesive film 32 to the bare battery cell 10 strong, while ensuring the connection stability with the tab 20, and avoid the first adhesive film 31 and the second adhesive film 32 attached to the tab 20 being too large and too close to the welding area 23 (refer to Figure 3 ) and may cause abnormalities.

[0076] In addition, combined Figure 2 The diaphragm 14 will have an end position, which is located at the outermost side in the stacking direction (i.e., the first direction X) of the electrode 13 in the laminated battery cell. When the adhesive film is attached to the diaphragm 14, it is also attached to the surface of the bare battery cell 10 in the thickness direction. The adhesive film can play a role in reinforcing the end position of the diaphragm 14.

[0077] Combine Figure 6and Figure 7 、 Figure 10 When multiple tabs 20 are welded together, the welding position will deviate from the center line Q of the bare cell 10 in the thickness direction (first direction X). This is because the energy storage device usually needs to be equipped with multiple bare cells 10. The tabs 20 of two adjacent bare cells 10 will be connected through the connecting piece 40 and then connected as a whole to the pole 51 of the end cover assembly 50. In order to facilitate the connection with the connecting piece 40, the welding position of the multiple tabs 20 on the individual bare cell 10 will usually be adjusted to deviate from the center line Q of the thickness direction (first direction X) of the bare cell 10.

[0078] Since the first surface 11 is attached with the first adhesive film 31 and the second surface 12 is attached with the second adhesive film 32, and the welding of the multiple tabs 20 is performed after the adhesive films are attached, and the positions where the multiple tabs 20 are welded together deviate from the center line Q in the thickness direction of the bare battery cell 10, this results in the bending curvature of the multiple tabs 20 at one end connected to the bare battery cell 10 not being symmetrical with respect to the center line Q in the thickness direction of the bare battery cell 10, but the position where the multiple tabs 20 are welded together (that is, the bending portion 252 mentioned later) is more symmetrical. The smaller the curvature of the tab 20 at the end connected to the bare cell 10, the smaller the curvature of the tab 20 at the end connected to the bare cell 10. The larger the angle A between the tab 20 and the end face of the bare cell 10 in the length direction (i.e., the second direction Y) is, the greater the curvature of the tab 20 at the end connected to the bare cell 10 is, and the smaller the pulling force of the tab 20 on the electrode 13 is.

[0079] Since the bending degrees of the tab 20 at the end connected to the bare cell 10 near the first surface 11 and the second surface 12 are different, the pulling effect of the tab 20 is also different. Different values ​​of L1, L2, L3, and L4 can be set according to different pulling degrees.

[0080] Optional, reference Figure 4 and Figure 5 , L1 of the first adhesive film 31 is different from L3 of the second adhesive film 32. In this way, it can adapt to different pulling forces of different bending degrees at the end connected to the bare battery cell 10 when the tab 20 is gathered and welded.

[0081] Optional, reference Figure 4 and Figure 5 , L2 of the first adhesive film 31 is different from L4 of the second adhesive film 32. In this way, it can also adapt to different pulling forces of different bending degrees at the end connected to the bare battery cell 10 when the tab 20 is gathered and welded.

[0082] In addition, the total width of the first adhesive film 31 (ie, L1 + L2 ) and the total width of the second adhesive film 32 (ie, L3 + L4 ) may be different.

[0083] In one embodiment, reference Figures 8 to 10 , it is defined that the entirety of the multiple tabs 20 after being welded together, welded to the connecting piece 40, and bent is a tab member 25. The tab member 25 includes a lead portion 251, a bent portion 252, and a connecting portion 253. The lead portion 251 is led out from the bare cell 10, and the end of the lead portion 251 away from the bare cell 10 is connected to the bent portion 252. The end of the bent portion 252 away from the lead portion 251 is connected to the connecting portion 253. The connecting portion 253 extends toward the second surface 12, and the connecting piece 40 is connected to the connecting portion 253 facing the surface of the bare cell 10. The first adhesive film 31 and the second adhesive film 32 are attached to the surface of the tab member 25, specifically, they can be attached to the surface of the lead portion 251. Multiple bare battery cells 10 are arranged in sequence along the first direction X, the pole ear pieces 25 connecting two adjacent bare battery cells 10 are connected to the same connecting piece 40, and the second surface 12 of any bare battery cell 10 connected to the same connecting piece 40 is opposite to the other bare battery cell 10, and the fourth area 322 of the second adhesive film 32 is partially in contact with the connecting piece 40.

[0084] In combination with the above description, multiple tabs 20 are gathered and welded together and then welded to the connecting piece 40. Thereafter, the tab 20 is bent and placed into the accommodating cavity 61 of the shell 60. When the tab 20 is bent, the connecting piece 40 may contact and scratch the tab 20, thereby damaging the tab 20. Therefore, the fourth area 322 of the second adhesive film 32 is provided to contact the connecting piece 40. The second adhesive film 32 can protect the tab 20 and prevent damage to the tab 20.

[0085] Optionally, the fourth region 322 also extends beyond the side of the connecting piece 40. Specifically, the connecting piece 40 includes a bottom surface facing the bare cell 10, a top surface opposite to the bottom surface, and a side surface connecting the bottom surface and the top surface, which side surface is opposite to the tab. The fourth region 322 extends beyond the side of the connecting piece 40, that is, the outer side of the side of the connecting piece 40 also has at least part of the fourth region 322. In this way, when the connecting piece 40 is displaced due to possible shaking, loosening, etc., it is always in contact with the fourth region 322 without damaging the tab 20. Therefore, such a setting can enhance the protection capability of the tab 20.

[0086] Optionally, the L4 dimension of the second adhesive film 32 may be set to be larger than the L2 dimension of the first adhesive film 31 , so that the fourth region 322 of the second adhesive film 32 can contact the connecting piece 40 .

[0087] Optionally, the second adhesive film 32 is a high-temperature resistant tape. In conjunction with the foregoing description, the first adhesive film 31 and the second adhesive film 32 can be attached before the multiple tabs 20 are welded together. Furthermore, high temperatures will be generated when the multiple tabs 20, after being welded together, are connected to the connecting piece 40 through welding. After the multiple tabs 20 are bent, the second adhesive film 32 is used to contact the connecting piece 40. This means that the welding position of the connecting piece 40 is closer to the second adhesive film 32 and can withstand higher temperatures. Therefore, configuring the second adhesive film 32 as a high-temperature resistant tape ensures bonding reliability. Furthermore, the second adhesive film 32 is a high-temperature resistant tape that can act as a heat insulator, preventing the heat from the welding of the connecting piece 40 from causing the diaphragm 14 to shrink, which could result in contact between the positive and negative electrode sheets 131 and 132, leading to a short circuit.

[0088] In combination with the above description, after the bare cells 10 are sequentially arranged along the first direction X to form a stacked cell group, the tabs 20 on two adjacent bare cells 10 are connected to the same connecting piece 40, and the two bare cells 10 and the corresponding tabs 20 are arranged roughly symmetrically. In actual processing, the tabs 20 are usually bent first, and then the two bare cells 10 are stacked along the first direction X, and then the connecting piece 40 is connected to the tabs 20 of the two bare cells 10 by welding. Figure 8 and Figure 9 The bending structure of the tab 20 of one embodiment is shown. The embodiments of the present invention are not limited to this bending structure, and any feasible bending structure may be used.

[0089] refer to Figure 8 and Figure 9 In the first direction, the bent portion 252 is closer to the first surface 11 than the second surface 12 , and L1 of the first adhesive film 31 is greater than L3 of the second adhesive film 32 .

[0090] For multiple tabs 20 on a bare battery cell 10, they are offset toward the first surface 11 when they are gathered and welded, so that the bending degree of the multiple tabs 20 close to the first surface 11 is small, and the bending degree close to the second surface 12 is large. Combined with the above description, L1 is larger, which can avoid the outer tabs 20 close to the first surface 11 from being severely pulled, thereby damaging the structure of the bare battery cell 10.

[0091] Such an arrangement can realize the stacking arrangement of multiple bare cells 10 , and at the same time can reduce the misalignment movement of the pole piece 13 caused by the pulling effect between each pole ear 20 and the pole piece 13 .

[0092] Please refer to Figure 10 , Figure 10The first and second adhesive films in the embodiment of the present invention are not shown. In one embodiment, the energy storage device includes a shell 60, an end cover assembly 50, two bare cells 10, two connecting pieces 40 and four pole ear pieces 25. The shell 60 has a accommodating cavity 61 with an opening at one end. The two bare cells 10 are stacked, and each bare cell 10 is connected to two pole ear pieces 25. Each connecting piece 40 is connected to the two pole ear pieces 25 at both ends of the two bare cells 10. The end cover assembly 50 includes two poles 51, and the two poles 51 are connected to the two pole ear pieces 25 in a one-to-one correspondence. The connected poles 51 and the pole ear pieces 25 have the same polarity, that is, one of the two poles 51 is a positive pole and the other is a negative pole. The two pole ear pieces 25 at one end of the two bare cells 10 are both positive poles, and the two pole ears at the other end are both negative poles. The pole ear pieces 25 and the poles 51 with the same polarity are connected by the connecting piece 40. After the bare cell 10, the tab 25, the connecting piece 40 and the end cap assembly 50 are connected, the whole is then loaded into the housing cavity 61 of the shell 60 through the opening of the shell 60, and then the end cap assembly 50 is connected and fixed to the shell 60 to close the opening of the shell 60. In order to ensure airtightness and safety, an explosion-proof valve 52 can also be provided on the end cap assembly 50. During the operation of the energy storage device, the bare cell 10 may produce gas. When the gas accumulated in the housing cavity 61 reaches the air pressure threshold, it can be exhausted through the explosion-proof valve 52 to ensure safety. The detailed structure of each part of the energy storage device is not limited by this utility model, and any feasible one is acceptable.

[0093] The present invention also provides an electrical device, including an energy storage device according to any of the aforementioned embodiments, wherein the energy storage device supplies power to the electrical device. The electrical device may be a power generation-side device, a grid-side device, a base station-side device, a user-side device, or the like, and may specifically be any type of electrical load, without limitation.

[0094] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" is based on the orientation or positional relationship described in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0095] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An energy storage device, characterized in that: include: A bare battery core (10) comprising a first surface (11) and a second surface (12) facing each other in a first direction (X), wherein the first direction (X) is a thickness direction of the bare battery core (10); A plurality of tabs (20) are sequentially arranged in the first direction (X) and connected to the end face of the bare battery core (10) in the second direction (Y), wherein the second direction (Y) is perpendicular to the first direction (X); A first adhesive film (31) includes a first region (311) and a second region (312) connected to each other, wherein the first region (311) is attached to the first surface (11), and the second region (312) is attached to the tab (20) adjacent to the first surface (11); The second adhesive film (32) includes a third region (321) and a fourth region (322) connected to each other, wherein the third region (321) is attached to the second surface (12), and the fourth region (322) is attached to the tab (20) adjacent to the second surface (12).

2. The energy storage device according to claim 1, characterized in that A plurality of the pole ears (20) are connected to form a pole ear component (25), and the pole ear component (25) includes a lead-out portion (251), a bent portion (252) and a connecting portion (253), the lead-out portion (251) is connected to the bare battery core (10), an end of the lead-out portion (251) away from the bare battery core (10) is connected to the bent portion (252), an end of the bent portion (252) away from the lead-out portion (251) is connected to the connecting portion (253), and the connecting portion (253) extends toward the second surface (12), and the first adhesive film (31) and the second adhesive film (32) are attached to the surface of the pole ear component (25); There are a plurality of bare cells (10), and the plurality of bare cells (10) are arranged in sequence along the first direction (X). The energy storage device further comprises a connecting piece (40), wherein the connecting piece (40) is connected to the surface of the connecting portion (253) facing the bare cell (10), the pole ear pieces (25) connected to two adjacent bare cells (10) are connected to the same connecting piece (40), and the second surface (12) of any bare cell (10) connected to the same connecting piece (40) is opposite to the other bare cell (10), and the fourth region (322) is partially in contact with the connecting piece (40).

3. The energy storage device according to claim 2, characterized in that The fourth region (322) also extends beyond the side surface of the connecting piece (40).

4. The energy storage device according to claim 2, characterized in that The second adhesive film (32) is a high-temperature resistant adhesive tape.

5. The energy storage device according to claim 2, characterized in that The size of the first region (311) from the end away from the second region (312) to the end connected to the second region (312) is L1, the size of the second region (312) from the end away from the first region (311) to the end connected to the first region (311) is L2, the size of the third region (321) from the end away from the fourth region (322) to the end connected to the fourth region (322) is L3, and the size of the fourth region (322) from the end away from the third region (321) to the end connected to the third region (321) is L4, satisfying: 1 / 4≤L2 / L1≤4 / 5, 1 / 4≤L4 / L3≤4 / 5.

6. The energy storage device according to claim 5, characterized in that L1 of the first adhesive film (31) is different from L3 of the second adhesive film (32).

7. The energy storage device according to claim 6, characterized in that In the first direction (X), the bent portion (252) is closer to the first surface (11) than the second surface (12), and L1 of the first adhesive film (31) is greater than L3 of the second adhesive film (32).

8. The energy storage device according to claim 7, characterized in that L2 of the first adhesive film (31) is smaller than L4 of the second adhesive film (32).

9. The energy storage device according to claim 1, characterized in that The tab (20) has a welding area (23), a distance d1 between the end of the second area (312) away from the first area (311) and the welding area (23) is greater than or equal to 3 mm, and a distance d2 between the end of the fourth area (322) away from the third area (321) and the welding area (23) is greater than or equal to 3 mm.

10. The energy storage device according to claim 1, characterized in that The first adhesive film (31) and the second adhesive film (32) both extend along a third direction (Z), and the third direction (Z) is perpendicular to the first direction (X) and the second direction (Y). In the third direction (Z), the size of the first adhesive film (31) and the size of the second adhesive film (32) are both smaller than the size of the tab (20), and the distance between the end of the first adhesive film (31) and the end of the second adhesive film (32) and the end of the tab (20) is W, satisfying the following: 2mm≤W≤10mm.

11. The energy storage device according to claim 1, characterized in that A through hole (33) is provided at the junction of the first area (311) and the second area (312), and the diameter D of the through hole (33) is 1 mm to 5 mm.

12. The energy storage device according to claim 11, characterized in that There are a plurality of through holes (33), and the plurality of through holes (33) are sequentially spaced apart, with a spacing d3 between adjacent through holes (33) being 8 mm to 12 mm.

13. The energy storage device according to claim 1, characterized in that The plurality of tabs (20) include a positive tab (21) and a negative tab (22), wherein the positive tab (21) is connected to one end of the bare cell (10) in the second direction (Y), and the negative tab (22) is connected to the other end of the bare cell (10) in the second direction (Y), the first surface (11) and the positive tab (21) are attached with the first adhesive film (31), the first surface (11) and the negative tab (22) are attached with another first adhesive film (31), the second surface (12) and the positive tab (21) are attached with the second adhesive film (32), and the second surface (12) and the negative tab (22) are attached with another second adhesive film (32).

14. An electrical device, characterized in that: It comprises an electric device and an energy storage device according to any one of claims 1 to 13, wherein the energy storage device supplies power to the electric device.

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