A compensation film, a battery cell, a battery, and an electric device

Abstract

The application discloses a compensation film, a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The compensation film comprises a compensation film body and a compensation convex part for compensating a thinned area of a pole piece, and the compensation convex part is protruded on the surface of the compensation film body; and the compensation convex part is provided with a slope area. By arranging the compensation convex part on the surface of the compensation film body, on one hand, the thickness of the thinned area of the pole piece can be effectively compensated, the adhesion degree of the thinned area of the pole piece and the diaphragm is improved, the stress received by the pole piece is homogenized, the wrinkles are reduced, the cycle performance of the battery cell is improved, and on the other hand, the problem that the compensation film body is prone to slipping after being packaged when the compensation convex part is not arranged is solved, and the structural stability of the battery cell is improved. The battery monomer and the battery containing the compensation film have better cycle performance, and the electric performance of the power utilization device is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a compensation film, a battery cell, a battery, and an electrical device. Background Technology

[0002] Cell design needs to consider the processing performance of the electrodes. For example, during the electrode coating process, the physicochemical properties of the slurry and the changes during the electrode baking process need to be taken into account, thus requiring the design of electrode thinning areas. After cell stacking or winding, the thickness difference between the edge and the middle area of ​​the cell can accumulate to several hundred micrometers. During the hot pressing stage of the cell, since the hot pressing equipment is basically flat plate hot pressing, the thinning area is subjected to less stress, and the positive electrode, negative electrode and separator cannot be effectively and tightly bonded. Some gas will remain here during the subsequent SEI film formation process. In addition, after lithium insertion into the negative electrode, the uncompressed part of the electrode is prone to greater expansion, resulting in uneven stress distribution on the electrode, which will cause wrinkles, lengthen the ion transport channel, easily cause local polarization, pose a risk of lithium plating, and lead to a decrease in cell cycle performance.

[0003] To address the above issues, most battery cell manufacturers currently employ methods such as improving hot pressing processes or equipment. However, some of these methods involve complex processes and are difficult to implement, while others can significantly increase costs.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] One of the objectives of this invention is to provide a compensation film that can effectively compensate for the thickness of the electrode thinning area under simple process operations, improve the adhesion between the electrode and the separator in the thinning area, and has a low cost.

[0006] The second objective of this invention is to provide a battery cell containing the aforementioned compensation film.

[0007] The third objective of this invention is to provide a battery containing the aforementioned battery cells.

[0008] The fourth objective of this invention is to provide an electrical device containing the aforementioned battery cell or battery.

[0009] This application can be implemented as follows:

[0010] In a first aspect, this application provides a compensation membrane, which includes a compensation membrane body and a compensation protrusion for compensating the thinned area of ​​the electrode sheet, the compensation protrusion being provided on the surface of the compensation membrane body; the compensation protrusion is provided with a slope area.

[0011] In an optional embodiment, the compensation protrusion has only one protrusion; the protrusion is disposed on the surface of the compensation membrane, and a sloped area is formed on the side of the protrusion away from the compensation membrane.

[0012] In an alternative implementation, the slope area is truncated.

[0013] In an optional embodiment, the compensation protrusion includes at least two protrusions, all of which are stacked sequentially on the surface of the compensation membrane, and a slope zone is formed between at least the two outermost protrusions.

[0014] In an alternative implementation, the slope area is stepped.

[0015] In an optional embodiment, the compensation membrane includes a main membrane surface, a side membrane surface, and a bottom membrane surface, wherein the side membrane surface and the bottom membrane surface are respectively connected to different sides of the main membrane surface, and the compensation protrusion is disposed on the main membrane surface.

[0016] The main film surface, side film surface, and bottom film surface work together to separate the electrode assembly from the housing.

[0017] Secondly, this application provides a battery cell, which includes a casing, an electrode assembly, and at least one compensation film of any of the foregoing embodiments; the electrode assembly is disposed inside the casing, and at least one compensation film is disposed between the electrode assembly and the casing;

[0018] The electrode assembly has a thinned area, and the compensation protrusion of the compensation film is provided corresponding to the thinned area. The thickness of the slope area of ​​the compensation protrusion is greater than or equal to the total thinning thickness of the electrode assembly.

[0019] In an optional embodiment, the compensation protrusion is located on the side of the compensation membrane facing or away from the electrode assembly.

[0020] Thirdly, this application provides a battery comprising a plurality of battery cells according to the aforementioned embodiments.

[0021] Fourthly, this application provides an electrical device that includes a battery cell or a battery as described in the aforementioned embodiments.

[0022] The beneficial effects of this application include:

[0023] This application, by providing compensation protrusions on the surface of the compensation film, can effectively compensate for the thickness of the electrode thinning area, improve the adhesion between the electrode and the separator in the thinned area, homogenize the stress on the electrode, reduce wrinkles, and improve the cycle performance of the cell. Furthermore, it can also improve the problem of slippage that easily occurs after encapsulation when the compensation film is not provided with compensation protrusions, thus improving the structural stability of the cell. Battery cells and batteries containing the above-mentioned compensation film can have better cycle performance, which is beneficial for improving or enhancing the electric performance of electrical devices. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the first structural embodiment of the compensation membrane provided in this application;

[0026] Figure 2 A schematic diagram of a second structural representation of the compensation membrane provided in this application;

[0027] Figure 3 A schematic diagram of the first structure of the compensation protrusion of the compensation membrane provided in this application;

[0028] Figure 4 This is a schematic diagram of a second structure of the compensation protrusion of the compensation membrane provided in this application.

[0029] Icons: 1-Compensation membrane; 11-Main membrane surface; 111-First main membrane surface; 112-Second main membrane surface; 121-First side membrane surface; 122-Second side membrane surface; 123-Third side membrane surface; 124-Fourth side membrane surface; 13-Bottom membrane surface; 2-Compensation protrusion; 21-Protrusion; 211-First protrusion; 212-Second protrusion; 213-First side surface; 214-Second side surface; 215-Third side surface; 216-Fourth side surface; 217-Fifth side surface; 22-Slope area; 221-Cut corner; 222-Step. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0031] The following is a detailed description of the compensation film, battery cell, battery, and power device provided in this application.

[0032] This application proposes a compensation membrane, which should be referred to in conjunction with the above. Figures 1 to 4 The compensation membrane includes a compensation membrane body 1 and a compensation protrusion 2 for compensating the thinned area of ​​the electrode sheet. The compensation protrusion 2 protrudes from the surface of the compensation membrane body 1.

[0033] Since the thinned area has a thickness slope from the side near the middle of the electrode to the side near the tab, the compensation protrusion 2 also needs to be provided with a corresponding slope to match the thinned area of ​​the corresponding electrode. Therefore, in this application, the compensation protrusion 2 is provided with a slope area 22.

[0034] For reference, the compensation film can be Mylar film (also known as "Mylar film", which is a type of polyester film). Alternatively, it can be other polymer insulating films used to protect the electrode assembly during the electrode assembly packaging process.

[0035] In practice, the compensation protrusion 2 can be integrally formed with the compensation membrane 1, or it can be formed in two stages (such as by connecting the finished compensation protrusion 2 and the finished compensation membrane 1 together). The material of the compensation protrusion 2 can be the same as that of the compensation membrane 1, or it can be different.

[0036] The compensation protrusion 2 can be positioned only in the direction facing the electrode assembly (i.e., away from the outer casing) of the compensation membrane 1, or only in the direction away from the electrode assembly (i.e., facing the outer casing) of the compensation membrane 1, or simultaneously in both the direction facing the electrode assembly and the direction away from the electrode assembly of the compensation membrane 1. In other words, the compensation protrusion 2 is located on the side of the compensation membrane 1 facing or away from the electrode assembly.

[0037] The aforementioned electrode assembly includes at least one bare cell. Understandably, each battery cell contains one electrode assembly, each electrode assembly includes at least one bare cell, and each bare cell may include multiple electrode plates.

[0038] In some embodiments, the surface of the compensating protrusion 2 that is in contact with the electrode assembly and / or the housing can be an adhesive surface or a non-adhesive surface.

[0039] In some embodiments, the thickness of the thinned region is 0 (excluding) to 20 mm, and the thickness difference of the thinned region of each electrode is approximately 0 (excluding) to 30 μm. The thickness of the slope region 22 of the compensating protrusion 2 is greater than or equal to the total thinning thickness of the electrode assembly, that is, the sum of the thicknesses of the compensating protrusions 2 is greater than or equal to the sum of the thinning thicknesses of the thinned regions of the electrodes contained in the electrode assembly. This helps to ensure that the electrode is subjected to uniform stress after expansion, thereby reducing wrinkle formation and lowering the risk of lithium plating.

[0040] In some embodiments, the compensation protrusion 2 has only one protrusion 21; the protrusion 21 is disposed on the surface of the compensation membrane 1, and a slope area 22 is formed on the side of the protrusion 21 away from the compensation membrane 1.

[0041] The slope zone 22 mentioned above can be shaped like a tangent 221, and the angle of the tangent 221 can be set according to actual needs.

[0042] For example, the shape of the protrusion 21 can be referred to Figure 3 This can be understood as being obtained by cutting a pentahedron with a triangular cross-section from a hexahedron with a rectangular or square cross-section. The hexahedron includes a first side face 213, a second side face 214, a third side face 215, a fourth side face 216, a fifth side face 217, and a sixth side face (not shown). The first side face 213 and the third side face 215 are positioned opposite each other, the second side face 214 and the fourth side face 216 are positioned opposite each other, and the fifth side face 217 and the sixth side face are positioned opposite each other. The cut pentahedron is formed by the cut portions of the second side face 214, the third side face 215, the fifth side face 217, and the sixth side face of the hexahedron.

[0043] The angle of the chamfer 221 can be understood as being related to the cutting positions of the second side 214 and the third side 215. The cutting position of the second side 214 extends from its connection point with the surface of the compensation membrane 1 to its connection point with the third side 215. Similarly, the cutting position of the third side 215 extends from its connection point with the second side 214 to its connection point with the fourth side 216. That is, Figure 3 Position A can be moved to the left or right as needed, and position B can be moved up or down as needed.

[0044] In other embodiments, the compensation protrusion 2 includes at least two protrusions 21 (e.g., two, three or more protrusions 21), all of which are stacked sequentially on the surface of the compensation membrane 1, and a slope zone 22 is formed between at least the two outermost protrusions 21.

[0045] Please refer to Figure 4 Taking the compensation protrusion 2, which includes a first protrusion 211 and a second protrusion 212, as an example, the term "overlapping" can be understood as follows: the first protrusion 211 is disposed on the surface of the compensation membrane 1, and the second protrusion 212 is disposed on the side of the first protrusion 211 away from the compensation membrane 1. When the compensation protrusion 2 is provided with more than two protrusions 21, the placement of each protrusion 21 can be deduced by analogy to the case where there are two protrusions 21.

[0046] The aforementioned slope area 22 can be in the shape of a step 222. It should be noted that the step 222 can be a right-angle step 222 or a step 222 at other angles, and the specific angle of the step 222 can be set as needed.

[0047] In some embodiments, except for the two outermost protrusions 21, the projections of the remaining protrusions 21 on the same surface of the compensation membrane 1 completely overlap. In this case, only the two outermost protrusions 21 form a slope region 22. In other embodiments, based on the two outermost protrusions 21, the remaining parts or all of the protrusions 21 may each form a slope region 22 between themselves and their adjacent protrusions 21.

[0048] The slope of the aforementioned compensating protrusion 2 corresponds to the slope of the thickness of the thinned area of ​​the electrode sheet. The sum of the total thickness of the slope of the compensating protrusion 2 is greater than or equal to the sum of the thickness differences of the thinned areas of the electrode sheet. In other words, the sum of the thickness of the compensating protrusion 2 is greater than or equal to the sum of the thicknesses of the thinned areas of the electrode sheet contained in the electrode assembly.

[0049] Please continue to refer to this application. Figure 1 and Figure 2 The compensation membrane 1 may include a main membrane surface 11, a side membrane surface, and a bottom membrane surface 13. The side membrane surface and the bottom membrane surface 13 are respectively connected to different sides of the main membrane surface 11. The compensation protrusion 2 is disposed on the main membrane surface 11. The main membrane surface 11, the side membrane surface, and the bottom membrane surface 13 are used to cooperate to separate the electrode assembly from the housing.

[0050] The positions and quantities of the main film surface 11, side film surface, and bottom film surface 13 can be set according to the electrode tab arrangement. The compensation film can be finally encapsulated through the bottom film surface 13 or the side film surface, and the encapsulation methods include, but are not limited to, hot melt, adhesive bonding, or overlay encapsulation.

[0051] Micropores can be provided in each membrane area to increase the electrolyte wetting rate during injection and improve the wetting effect.

[0052] In some embodiments, taking the electrode assembly with bipolar tabs on the same side as an example, the positive electrode thinning area and the negative electrode thinning area are on the same side. Correspondingly, the compensation membrane 1 is provided with at least one compensation protrusion 2.

[0053] For example, refer to Figure 1 The compensation membrane 1 includes two main membrane surfaces 11 (the first main membrane surface 111 and the second main membrane surface 112, respectively), four side membrane surfaces (the first side membrane surface 121, the second side membrane surface 122, the third side membrane surface 123 and the fourth side membrane surface 124, respectively), and one bottom membrane surface 13. Each main membrane surface 11, side membrane surface and bottom membrane surface 13 has a first side, a second side, a third side and a fourth side that are connected end to end.

[0054] The first edge of the first main membrane surface 111 is connected to the first edge of the bottom membrane surface 13; the first edge of the second main membrane surface 112 is connected to the third edge of the bottom membrane surface 13; the first side membrane surface 121 is connected to the second edge of the first main membrane surface 111, and the second side membrane surface 122 is connected to the fourth edge of the first main membrane surface 111; the third side membrane surface 123 is connected to the second edge of the second main membrane surface 112, and the fourth side membrane surface 124 is connected to the fourth edge of the second main membrane surface 112; a compensation protrusion 2 is provided at the edge of the third edge of the first main membrane surface 111 and / or the edge of the third edge of the second main membrane surface 112.

[0055] The edge positions of the third side of the first main film surface 111 and the third side of the second main film surface 112 both correspond to the thinning area of ​​the electrode. Based on this, the compensation protrusion 2 can be provided only at the edge position of the third side of the first main film surface 111, the compensation protrusion 2 can be provided only at the edge position of the third side of the second main film surface 112, or the compensation protrusion 2 can be provided at both the edge positions of the third side of the first main film surface 111 and the edge positions of the third side of the second main film surface 112. When both the first main film surface 111 and the second main film surface 112 are provided with compensation protrusion 2, the projections of the two compensation protrusions 2 on the same surface of the electrode coincide.

[0056] Furthermore, when the electrode assembly adopts a bipolar tab on the same side, the main film surface 11 of the compensation film 1 may be only the first main film surface 111 or the second main film surface 112 mentioned above, and the compensation protrusion 2 is provided on the corresponding main film surface 11.

[0057] The number and form of the protrusions 21 on the compensation protrusion 2 can be referred to the above content, and will not be repeated here.

[0058] In other embodiments, taking the electrode assembly as an example of bipolar tabs on opposite sides, the positive electrode thinning area and the negative electrode thinning area are on opposite sides, and correspondingly, the compensation membrane 1 is provided with at least two compensation protrusions 2.

[0059] For details, please refer to Figure 2 The compensation membrane 1 includes two main membrane surfaces 11 (the first main membrane surface 111 and the second main membrane surface 112, respectively), two side membrane surfaces (the first side membrane surface 121 and the second side membrane surface 122, respectively), and one bottom membrane surface 13. Each main membrane surface 11, side membrane surface, and bottom membrane surface 13 has a first side, a second side, a third side, and a fourth side that are connected end to end.

[0060] The first side of the first main membrane surface 111 is connected to the first side of the bottom membrane surface 13; the first side of the second main membrane surface 112 is connected to the third side of the bottom membrane surface 13; the first side membrane surface 121 is connected to the third side of the first main membrane surface 111; the second side membrane surface 122 is connected to the third side of the second main membrane surface 112.

[0061] The edge positions of the second side and the fourth side of the first main film surface 111 correspond to the thinning area of ​​the electrode sheet at the opposite electrode tab, respectively. The edge positions of the second side and the fourth side of the second main film surface 112 also correspond to the thinning area of ​​the electrode sheet at the opposite electrode tab, respectively. The edge positions of the second side of the first main film surface 111 and the second side of the second main film surface 112 correspond to the thinning area of ​​the same electrode tab, and the edge positions of the fourth side of the first main film surface 111 and the fourth side of the second main film surface 112 correspond to the thinning area of ​​the same electrode tab.

[0062] Compensating protrusions 2 are provided at the edge positions of the second side of the first main film surface 111 and / or the edge positions of the second side of the second main film surface 112, and compensating protrusions 2 are also provided at the edge positions of the fourth side of the first main film surface 111 and / or the fourth edge positions of the second main film surface 112. Therefore, the provision of the compensating protrusions 2 can include the following methods:

[0063] Compensation protrusions 2 are provided only at the edge of the second side and the edge of the fourth side of the first main membrane surface 111;

[0064] Alternatively, the compensation protrusion 2 may be provided only at the edge of the second side of the second main membrane surface 112 and at the edge of the fourth side of the second main membrane surface 112;

[0065] Alternatively, the compensation protrusion 2 may be provided only at the edge of the second side of the first main membrane surface 111 and the edge of the fourth side of the second main membrane surface 112;

[0066] Alternatively, the compensation protrusion 2 may be provided only at the edge of the second side of the second main membrane surface 112 and at the edge of the fourth side of the first main membrane surface 111;

[0067] Alternatively, a compensation protrusion 2 may be provided at the edge of the second side of the first main membrane surface 111, the edge of the fourth side of the first main membrane surface 111, and the edge of the second side of the second main membrane surface 112.

[0068] Alternatively, a compensation protrusion 2 may be provided at the edge of the second side of the first main membrane surface 111, the edge of the second side of the second main membrane surface 112, and the edge of the fourth side of the second main membrane surface 112.

[0069] Alternatively, a compensation protrusion 2 may be provided at the edge of the fourth side of the first main membrane surface 111, the edge of the second side of the second main membrane surface 112, and the edge of the fourth side of the second main membrane surface 112.

[0070] Alternatively, a compensation protrusion 2 may be provided at the edge of the fourth side of the second main membrane surface 112, the edge of the second side of the first main membrane surface 111, and the edge of the fourth side of the first main membrane surface 111.

[0071] Alternatively, a compensation protrusion 2 may be provided at the edge of the second side of the first main membrane surface 111, the edge of the fourth side of the first main membrane surface 111, the edge of the second side of the second main membrane surface 112, and the edge of the fourth side of the second main membrane surface 112.

[0072] When compensation protrusions 2 are provided at the edges of the second side of the first main film surface 111 and the second side of the second main film surface 112, the projections of the two compensation protrusions 2 on the same surface of the electrode overlap. When compensation protrusions 2 are provided at the edges of the fourth side of the first main film surface 111 and the fourth side of the second main film surface 112, the projections of the two compensation protrusions 2 on the same surface of the electrode overlap. The number and form of the protrusions 21 on each compensation protrusion 2 can be referred to the foregoing content and will not be repeated here.

[0073] Continuing from the above, by providing compensation protrusions 2 on the surface of the compensation film 1, it can compensate for the thickness difference of the thinned electrode sheets, improve the contact and adhesion between the thinned electrode sheets (including positive and / or negative electrode sheets) and the separator during formation and cycling, prevent the generation of non-contact spaces in the thinned electrode sheets, and reduce the risk of lithium plating. In addition, due to the presence of compensation protrusions 2, the expansion stress of the negative electrode is uniform during the lithium ion insertion process, and the risk of wrinkles is small, which can also reduce the risk of lithium plating, improve the cell cycle performance, and homogenize the stress on the electrode sheets, reduce wrinkles, and improve the cell cycle performance.

[0074] It should be noted that existing Mylar films are prone to slippage after encapsulation and are not easy to fix. By providing adhesive compensation protrusions 2 on the surface of the compensation film 1, the Mylar film and the electrode assembly can be effectively fixed after encapsulation with the electrode assembly, preventing slippage and misalignment between the electrode assembly and the Mylar film, and avoiding affecting the cell performance due to slippage and misalignment.

[0075] Furthermore, this application also provides a battery cell, which includes a casing, an electrode assembly, and at least one layer of the aforementioned compensation film. Exemplarily, the number of layers of the compensation film can be set to 1, 2, 3, or more as needed.

[0076] The electrode assembly is housed within the housing, and at least one compensation film is provided between the electrode assembly and the housing to prevent scratches on the electrode assembly and to insulate the electrode assembly from the housing. The electrode sheet of the electrode assembly has a thinned area, and the compensation protrusion 2 of the compensation film is provided corresponding to the thinned area.

[0077] The aforementioned battery cell also includes a cover plate, on which at least one electrode post is disposed. After the electrode assembly and compensation membrane are assembled into the housing, the cover plate and the housing are assembled and sealed. An injection hole and an explosion-proof valve are optionally disposed on the surface of the cover plate and the housing.

[0078] It should be noted that the aforementioned battery cells can be directly assembled into a battery pack, or directly assembled into a battery module, or assembled into a battery module first and then assembled into a battery pack.

[0079] Furthermore, this application also provides a battery comprising a plurality of battery cells of the aforementioned embodiments.

[0080] By way of example, the battery can be a battery pack or a battery module.

[0081] In addition, this application also provides an electrical device that includes the aforementioned battery cell or battery.

[0082] For example, the metering device can be a car, an energy storage cabinet, or a power tool.

[0083] In summary, this application, by providing compensation protrusions 2 on the surface of the compensation film 1, can effectively compensate for the thickness of the electrode thinning area, improve the adhesion between the electrode and the separator in the thinned area, homogenize the stress on the electrode, reduce wrinkles, and improve the cycle performance of the cell. Furthermore, it can also improve the problem of slippage that easily occurs after encapsulation when the compensation film 1 is not provided with compensation protrusions 2, thereby improving the structural stability of the cell. Battery cells and batteries containing the above-mentioned compensation film can have better cycle performance, which is beneficial for improving or enhancing the electric performance of electrical devices.

[0084] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A compensation membrane, characterized in that, It includes a compensation membrane and a compensation protrusion for compensating the thinning area of ​​the electrode sheet, the compensation protrusion being provided on the surface of the compensation membrane and the compensation protrusion being integrally formed with the compensation membrane; The compensation protrusion is provided with a sloped area; The compensation membrane includes a main membrane surface, a side membrane surface, and a bottom membrane surface. The side membrane surface and the bottom membrane surface are respectively connected to different sides of the main membrane surface. The compensation protrusion is disposed on the main membrane surface. The main membrane surface, the side membrane surface, and the bottom membrane surface are used to cooperate to separate the electrode assembly from the housing. The thickness of the slope zone of the compensating protrusion is greater than or equal to the total thinning thickness of the electrode assembly; The compensation protrusion includes at least two protrusions, all of which are stacked sequentially on the surface of the compensation membrane, and the slope area is formed between at least the two outermost protrusions; the slope area is stepped.

2. A single battery cell, characterized in that, The device includes a housing, an electrode assembly, and at least one layer of the compensation film as described in claim 1; the electrode assembly is disposed within the housing, and at least one layer of the compensation film is disposed between the electrode assembly and the housing. The electrode assembly has an electrode thinning area, the compensation protrusion of the compensation film is correspondingly disposed to the electrode thinning area, and the thickness of the slope area of ​​the compensation protrusion is greater than or equal to the total thinning thickness of the electrode assembly.

3. The battery cell according to claim 2, characterized in that, The compensation protrusion is located on the side of the compensation membrane facing or away from the electrode assembly.

4. A battery, characterized in that, It includes multiple battery cells as described in claim 2 or 3.

5. An electrical device, characterized in that, Includes the battery cell as described in claim 2 or 3 or the battery as described in claim 4.

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