Battery cells and electrical equipment

Abstract

This invention provides a battery cell and an electrical device, relating to the field of lithium-ion battery production technology, to improve the technical problem of low electrolyte penetration rate and slow heat dissipation caused by the close contact between the cores in existing multi-core batteries. The battery cell includes a casing, an electrode assembly, a separator, and a cover plate; wherein the electrode assembly includes multiple cores stacked together, with gaps formed between adjacent cores, and separators disposed within these gaps to separate adjacent cores; this invention, by providing expansion space for the cores through gaps and separators within these gaps, increases the heat dissipation rate of the cores and improves the electrolyte penetration rate between adjacent cores.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery production technology, and more specifically, to a battery cell and its electrical equipment. Background Technology

[0002] Currently, for multi-core batteries, the contact between the cores is too tight, resulting in a lower electrolyte penetration rate, slower heat dissipation, and less room for expansion in the later stages of battery life, posing certain safety hazards. Summary of the Invention

[0003] The present invention aims to provide a battery cell and an electrical device to improve the technical problems of low electrolyte penetration rate and slow heat dissipation caused by the close contact between the cores in existing multi-core batteries.

[0004] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a battery cell, comprising: A housing having an open accommodating cavity; An electrode assembly, comprising a plurality of cores disposed within the accommodating cavity, the plurality of cores being stacked together, with gaps formed between adjacent cores; A separator, wherein the separator is disposed within the gap to separate adjacent winding cores; A cover plate, which is connected to the housing and seals the accommodating cavity.

[0005] In an optional embodiment, the separator includes a first separator, a second separator, and a first support side plate; wherein the first separator and the second separator are spaced apart, and the first separator and the second separator are connected by a plurality of the first support side plates.

[0006] In an optional embodiment, the first separator has a plurality of first through holes, and the second separator has a plurality of second through holes, wherein the first through holes and the second through holes are arranged concentrically or alternately along the core stacking direction.

[0007] In an optional embodiment, the partition further includes a supporting inclined plate; the first partition has a first connecting end, and the second partition has a second connecting end on the side away from the first connecting end; one end of the supporting inclined plate is connected to the first connecting end, and the other end of the supporting inclined plate is connected to the second connecting end, so that the supporting inclined plate is inclinedly supported between the first partition and the second partition.

[0008] In an optional embodiment, the separator includes a third separator, a fourth separator, a first support base plate, and at least one foldable separator unit; The third and fourth separators are connected by the first support base plate. The third and fourth separators are disposed between the core and the shell to separate the core and the shell. The foldable divider unit includes a third support side plate and a fifth divider. The fifth divider is connected to the third divider through the third support side plate and is disposed in the gap to separate adjacent cores.

[0009] In an optional embodiment, the foldable partition unit is disposed on one side of the third partition; a second support side plate is disposed on the side of the third partition away from the foldable partition unit.

[0010] In an optional implementation, the number of cores is n, and the number of foldable divider units is n-1, where n>2; The foldable divider unit is disposed between adjacent cores to separate them.

[0011] In an optional embodiment, the number of the core is two, the number of the foldable divider units is two, and the two foldable divider units are disposed on both sides of the third divider along the length direction of the core. Two of the foldable divider units are disposed between the two cores to separate the two cores.

[0012] In an optional embodiment, the separator includes a sixth separator, a second separator base plate, a seventh separator, and at least one eighth separator, wherein the sixth separator is further provided with a fourth support side plate and a fifth support side plate on both sides along the length direction of the core. The sixth and seventh separators are connected by a second separator base plate, the eighth separator is disposed on the second separator base plate, and the sixth and seventh separators are disposed between the core and the housing to separate the core and the housing; The eighth separator is disposed in the gap to separate adjacent cores.

[0013] In an optional implementation, the number of winding cores is m, and the number of eighth separators is m-1, where m>2.

[0014] Secondly, the present invention provides an electrical device comprising a battery cell as described in any of the foregoing embodiments.

[0015] The beneficial effects of the battery cells and electrical devices provided in the embodiments of the present invention include: This invention provides a battery cell and an electrical device including the battery cell. The battery cell includes a housing, an electrode assembly, a separator, and a cover plate. The electrode assembly includes multiple cores stacked together, with gaps formed between adjacent cores. The separator is disposed within the gaps to separate adjacent cores. By providing gaps between adjacent cores and distributing separators within these gaps, this invention provides expansion space for the cores while increasing the heat dissipation rate of the cores and improving the electrolyte penetration rate between adjacent cores. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the separator in the secondary battery cell provided in this embodiment 1; Figure 2 This is a schematic diagram of the separator in the secondary battery cell provided in this embodiment 2; Figure 3 This is a schematic diagram of the planar unfolded structure of the separator in the secondary battery cell provided in Embodiment 3; Figure 4 This is a schematic diagram of the assembly structure of the separator in the secondary battery cell provided in Embodiment 3; Figure 5 This is a schematic diagram of the planar unfolded structure of the separator in the secondary battery cell provided in Embodiment 4; Figure 6 This is a schematic diagram of the planar unfolded structure of the separator in the secondary battery cell provided in Embodiment 5. Figure 7 This is a schematic diagram of the planar unfolded structure of the separator in the secondary battery cell provided in Embodiment Six. Figure 8 This is a schematic diagram of the assembly structure of the separator in the secondary battery cell provided in Embodiment Six. Figure 9 This is a schematic diagram of the planar unfolded structure of the separator in the secondary battery cell provided in Embodiment 7.

[0018] Icon: 100 - Shell; 200 - Separator; 210 - First separator; 210a - First connecting end; 211 - First through hole; 220 - Second separator; 220a - Second connecting end; 221 - Second through hole; 230 - First supporting side plate; 240 - Supporting inclined plate; 250 - Third separator; 251 - Second supporting side plate; 260 - Fourth separator; 270 - First supporting bottom plate; 280 - Foldable separator unit; 281 - Third supporting side plate; 282 - Fifth separator; 290 - Sixth separator; 291 - Fourth supporting side plate; 292 - Fifth supporting side plate; 2100 - Second separator bottom plate; 2110 - Seventh separator; 2120 - Eighth separator; 300-cover plate; 400 - Electrode assembly; 410 - Core; 420 - Gap. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0025] Existing multi-core batteries have relatively close contact between adjacent cores, resulting in a lower electrolyte penetration rate and slower heat dissipation. This also means that the battery has less room for expansion in the later stages of its lifespan, posing certain safety risks.

[0026] Based on this, the present invention provides a battery cell and an electrical device including the battery cell, in order to improve the technical problem that the close contact between the cores in existing multi-core batteries leads to a low electrolyte penetration rate and slow heat dissipation.

[0027] The electrical equipment mentioned in this invention can be vehicles, ships, spacecraft, power tools, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the aforementioned electrical equipment.

[0028] The battery cell provided by the present invention includes a housing, an electrode assembly, a separator, and a cover plate; the cell assembly is disposed in an accommodating cavity, and the cell assembly includes multiple cores, which are stacked and a gap is formed between adjacent cores.

[0029] The battery cell provided by the present invention, by setting a gap between adjacent cores and setting a separator in the gap, provides expansion space for the cores while increasing the heat dissipation speed of the cores and improving the electrolyte penetration rate between adjacent cores.

[0030] The following detailed description of the overall structure, working principle, and technical effects of the battery cell and electrical equipment provided by the present invention, through embodiments and in conjunction with the accompanying drawings, is a practical example.

[0031] Example 1: Please see Figure 1 This embodiment provides a battery cell, including a housing 100, an electrode assembly 400, a separator 200, and a cover plate 300; wherein, the housing 100 has an open accommodating cavity, and the cover plate 300 is disposed on the open end of the housing 100 and seals the accommodating cavity. The cell assembly 400 is disposed in the accommodating cavity and includes a plurality of cores 410, which are stacked and gaps are formed between adjacent cores 410.

[0032] In this embodiment, the separator 200 includes a first separator 210, a second separator 220, and a first support side plate 230; wherein the first separator 210 and the second separator 220 are arranged at intervals, and the first separator 210 and the second separator 220 are connected by a plurality of first support side plates 230.

[0033] Understandably, since the first separator 210 and the second separator 220 are connected by a plurality of first support side plates 230, the first separator 210, the second separator 220 and the plurality of first support side plates 230 form a compressible structure, thereby providing an expandable space for the electrode.

[0034] In one specific embodiment, two first support side plates 230 are provided; the first separator 210 and the second separator 220 each have a first end and a second end, one of the first support side plates 230 is used to connect the first ends of the first separator 210 and the second separator 220, and the other first support side plate 230 is used to connect the second ends of the first separator 210 and the second separator 220; the two ends of the first support side plate 230 connected to the first separator 210 and the second separator 220 are configured to allow movement so that the gap between the first separator 210 and the second separator 220 can be compressed when the core 410 expands in volume.

[0035] In other embodiments, the number of first support side plates 230 can be adjusted according to actual working needs. For example, the number of first support side plates 230 can also be 3, 4, 5, etc., which are not limited here.

[0036] Furthermore, in order to improve the penetration rate of the electrolyte, in this embodiment, the first separator 210 is provided with a plurality of first through holes 211 and the second separator 220 is provided with a plurality of second through holes 221. The plurality of first through holes 211 and second through holes 221 are arranged concentrically or staggered along the stacking direction of the core 410.

[0037] Specifically, multiple first through holes 211 and second through holes 221 are opened one-to-one. The first through holes 211 and second through holes 221 are concentrically arranged along the stacking direction of the core 410, meaning that the axes of the corresponding first through holes 211 and second through holes 221 coincide along the stacking direction of the core 410. The first through holes 211 and second through holes 221 are staggered along the stacking direction of the core 410, meaning that the axes of the corresponding first through holes 211 and second through holes 221 are not on the same line along the stacking direction of the core 410.

[0038] The battery cell provided in this embodiment has, on the one hand, a first separator 210, a second separator 220 and a first support side plate 230 arranged between adjacent cores 410, and a compressible space between the first separator 210 and the second separator 220, providing space for the core 410 to expand in volume; on the other hand, the first separator 210 and the second separator 220 are provided with a first through hole 211 and a second through hole 221, through which electrolyte can permeate, thereby improving the permeation rate of electrolyte between adjacent cores 410.

[0039] Example 2: Please see Figure 2 This embodiment provides a battery cell whose overall structure, working principle, and technical effect are similar to those of Embodiment 1. The difference from Embodiment 1 is that the separator 200 further includes a supporting inclined plate 240. The supporting inclined plate 240 can replace the first supporting side plate 230, or work together with the first supporting side plate 230 to form a compressible support structure between the first separator 210 and the second separator 220.

[0040] Specifically, the first partition 210 is provided with a first connecting end 210a, and the second partition 220 is provided with a second connecting end 220a on the side away from the first connecting end 210a; one end of the supporting inclined plate 240 is connected to the first connecting end 210a, and the other end of the supporting inclined plate 240 is connected to the second connecting end 220a, so that the first partition 210, the supporting inclined plate 240, and the second partition 220 form a compressible "Z"-shaped structure, and are inclinedly supported between the first partition 210 and the second partition 220.

[0041] The two ends of the support sloping plate 240 connected to the first separator 210 and the second separator 220 are configured to be movable so that the gap between the first separator 210 and the second separator 220 can be compressed when the core 410 expands in volume.

[0042] Example 3: Please see Figure 3 and Figure 4 This embodiment provides a battery cell, similar to Embodiment 1 and Embodiment 2, including a housing 100, an electrode assembly 400, a separator 200, and a cover plate 300; the difference from Embodiment 1 and Embodiment 2 is that the separator 200 includes a third separator 250, a fourth separator 260, a first support base plate 270, and at least one foldable separator unit 280.

[0043] In this embodiment, the third separator 250 and the fourth separator 260 are connected by the first support base plate 270. The third separator 250 and the fourth separator 260 are disposed between the core 410 and the housing 100 to separate the core 410 and the housing 100.

[0044] Specifically, the third separator 250 and the fourth separator 260 are disposed between the side of the core 410 with a relatively large area and the inner side of the housing 100 to separate the core 410 and the housing 100; the first support base plate 270 is disposed between the bottom surface of the core 410 and the inner side of the housing 100. The third separator 250, the fourth separator 270 and the first support base plate 270 are arranged to wrap around multiple cores 410 to separate the multiple cores 410 from the housing 100.

[0045] In this embodiment, the relatively small side of the core 410 is separated from the inner side of the housing 100, and adjacent cores 410 are separated by a foldable partition unit 280. The foldable partition unit 280 includes a third support side plate 281 and a fifth partition 282. The fifth partition 282 is connected to the third partition 250 through the third support side plate 281 and is disposed in the gap 420 to separate adjacent cores 410.

[0046] It is understandable that the third partition 250, the fourth partition 260, the third support side plate 281, the fifth partition 282, and the first support base plate 270 are allowed to be bent in order to facilitate the arrangement of the third partition 250, the fourth partition 260, the third support side plate 281, and the fifth partition 282.

[0047] Furthermore, the foldable partition unit 280 is disposed on one side of the third partition 250, and the third partition 250 is provided with a second support side plate 251 on the side away from the foldable partition unit 280.

[0048] Understandably, the core 410 has two relatively small sides, one of which is separated from the inside of the housing 100 by a third support side plate 281, and the other side is separated from the inside of the housing 100 by a second support side plate 251.

[0049] Example 4: Please see Figure 5 This embodiment provides a battery cell whose overall structure, working principle, and technical effect are similar to those of Embodiment 3. The difference between Embodiment 3 and Embodiment 3 is that the number of cores 410 is greater than two.

[0050] In this embodiment, the number of cores 410 is n, and the number of foldable divider units 280 is n-1, where n>2. The foldable divider units 280 are disposed between adjacent cores 410 to separate adjacent cores 410.

[0051] Figure 5 The diagram shows the planar unfolded structure of the divider 200 when there are 4 cores 410 (n=4). At this time, there are 3 foldable divider units 280, which are sequentially connected to one side of the third divider 250.

[0052] For ease of understanding and description, the four cores 410 are referred to as the first core A, the second core B, the third core C, and the fourth core D, and the three foldable divider units 280 are referred to as foldable divider unit E, foldable divider unit F, and foldable divider unit G. The first core A, the second core B, the third core C, and the fourth core D are stacked sequentially, with the first core A and the fourth core D set close to the inner side of the housing 100. As can be understood, the first core A is separated from the housing 100 by the third divider 250, the fourth core D is separated from the housing 100 by the fourth divider 260, the first core A is separated from the second core B by the foldable divider unit E, the second core B is separated from the third core C by the foldable divider unit F, the third core C is separated from the fourth core D by the foldable divider unit G, and the bottom surfaces of the four cores 410 are separated from the inner side of the housing 100 by the first support base plate 270.

[0053] It should be noted that, Figure 5 The dimensions of each component shown are for illustrative purposes only and are not actual dimensions. Users can adjust the dimensions of each component according to actual working needs. For example, as the number of core 410 facilities increases, the dimensions of the first support base plate 270 and the second support side plate 251 should be increased accordingly to completely separate the core 410 from the housing 100.

[0054] Example 5: Please see Figure 6 This embodiment provides a battery cell whose overall structure, working principle, and technical effect are similar to those of Embodiment 4. The difference from Embodiment 4 is that the number of winding cores 410 is two, the number of foldable dividing units 280 is also two, and the two foldable dividing units 280 are disposed on both sides of the third dividing member 250 along the length of the winding core.

[0055] In this embodiment, two foldable dividing units 280 are disposed on both sides of the third dividing member 250, and can be configured between two adjacent cores 410 when folded in opposite directions to isolate the two adjacent cores 410.

[0056] Compared to Embodiment 4, the battery cell provided in this embodiment has a reduced dimension of the separator 200 in the length direction.

[0057] Example 6: Please see Figure 7 and Figure 8 This embodiment provides a battery cell whose working principle and technical effect are similar to those of embodiments three to five. The difference is that the separator 200 includes a sixth separator 290, a second separator base plate 2100, a seventh separator 2110, and at least one eighth separator 2120. The sixth separator 290 is also provided with a fourth support side plate 291 and a fifth support side plate 292 on both sides along the length direction of the core 410.

[0058] In this embodiment, the eighth separator 2120 is disposed in the gap 420 between adjacent cores 410 to separate adjacent cores 410.

[0059] Specifically, when there are two cores 410, the sixth separator 260 and the seventh separator 2110 are disposed between the side of the core 410 with a relatively larger area and the inner side of the housing 100 to separate the core 410 and the housing 100; the second separator base plate 2100 is disposed between the bottom surface of the core 410 and the inner side of the housing 100. The sixth separator 260, the seventh separator 2110 and the second separator base plate 2100 are disposed to enclose multiple cores 410 to separate the multiple cores 410 from the housing 100.

[0060] In this embodiment, the side of the core 410 with a relatively small area is separated from the inner side of the housing 100 by the fourth support side plate 291 and the fifth support side plate 292; the eighth separator 2120 is disposed in the gap 420 to separate adjacent cores 410.

[0061] Example 7: This embodiment provides a battery cell whose overall structure, working principle, and technical effects are similar to those of Embodiment Six. The difference is that the number of winding cores 410 is greater than two.

[0062] In this embodiment, the number of cores 410 is n, and the number of eighth separators 2120 is n-1, where n>2. The eighth separators 2120 are disposed between adjacent cores 410 to separate adjacent cores 410.

[0063] For example, when the number of cores 410 is 4 (m=4), for ease of understanding and description, the 4 cores 410 are referred to as the first core A, the second core B, the third core C and the fourth core D, and the 3 eighth dividers 2120 are referred to as the eighth dividers E, the eighth dividers F and the eighth dividers G. The first core A and the fourth core D are set close to the inner side of the housing 100; understandably, the first core A is separated from the housing 100 by the sixth separator 290, the fourth core D is separated from the housing 100 by the seventh separator 2110, the first core A is separated from the second core B by the eighth separator E, the second core B is separated from the third core C by the eighth separator F, the third core C is separated from the fourth core D by the eighth separator G, and the bottom surfaces of the four cores 410 are separated from the inner side of the housing 100 by the second dividing bottom plate 2100.

[0064] It should be noted that, Figure 9 The dimensions of each component shown are for illustrative purposes only and are not actual dimensions. Users can adjust the dimensions of each component according to actual working needs. For example, as the number of core 410 facilities increases, the dimensions of the fourth support side plate 291, the fifth support side plate 292, and the second partition bottom plate 2100 should be increased accordingly to completely separate the core 410 from the housing 100.

[0065] The battery cell provided by the present invention provides expansion space for the core 410 by setting a gap 420 between adjacent cores 410 and setting a separator 200 in the gap 420, while increasing the heat dissipation speed of the core 410 and improving the electrolyte penetration rate between adjacent cores 410.

[0066] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A single battery cell, characterized in that, include: A housing (100) having an open receiving cavity; The electrode assembly (400) includes a plurality of cores (410), the plurality of cores (410) are disposed in the accommodating cavity, the plurality of cores (410) are stacked, and a gap (420) is formed between adjacent cores (410). A separator (200) is disposed within the gap (420) to separate adjacent cores (410). A cover plate (300) is connected to the housing (100) and covers the accommodating cavity.

2. The battery cell according to claim 1, characterized in that, The separator (200) includes a first separator (210), a second separator (220), and a first support side plate (230); wherein the first separator (210) and the second separator (220) are spaced apart, and the first separator (210) and the second separator (220) are connected by a plurality of the first support side plates (230).

3. The battery cell according to claim 2, characterized in that, The first separator (210) has a plurality of first through holes (211), and the second separator (220) has a plurality of second through holes (221). The first through holes (211) and the second through holes (221) are arranged concentrically or alternately along the stacking direction of the core (410).

4. The battery cell according to claim 2, characterized in that, The partition (200) further includes a support ramp (240); the first partition (210) is provided with a first connecting end (210a), and the second partition (220) is provided with a second connecting end (220a) on the side away from the first connecting end (210a); one end of the support ramp (240) is connected to the first connecting end (210a), and the other end of the support ramp (240) is connected to the second connecting end (220a), so that the support ramp (240) is inclinedly supported between the first partition (210) and the second partition (220).

5. The battery cell according to claim 1, characterized in that, The separator (200) includes a third separator (250), a fourth separator (260), a first support base plate (270), and at least one foldable separator unit (280). The third separator (250) and the fourth separator (260) are connected by the first support base plate (270). The third separator (250) and the fourth separator (260) are disposed between the core (410) and the shell (100) to separate the core (410) and the shell (100). The foldable divider unit (280) includes a third support side plate (281) and a fifth divider (282). The fifth divider (282) is connected to the third divider (250) through the third support side plate (281). The fifth divider (282) is disposed in the gap (420) to separate adjacent cores (410).

6. The battery cell according to claim 5, characterized in that, The foldable partition unit (280) is disposed on one side of the third partition (250); a second support side plate (251) is disposed on the side of the third partition (250) away from the foldable partition unit (280).

7. The battery cell according to claim 6, characterized in that, The number of the core (410) is n, and the number of the foldable divider units (280) is n-1, where n>2; The foldable divider unit (280) is disposed between adjacent cores (410) to separate adjacent cores (410).

8. The battery cell according to claim 5, characterized in that, The number of the core (410) is two, the number of the foldable divider unit (280) is two, and the two foldable divider units (280) are disposed on both sides of the third divider (250) along the length direction of the core (410). Two of the foldable divider units (280) are disposed between the two cores (410) to separate the two cores (410).

9. The battery cell according to claim 1, characterized in that, The separator (200) includes a sixth separator (290), a second separator base plate (2100), a seventh separator (2110), and at least one eighth separator (2120). The sixth separator (290) is further provided with a fourth support side plate (291) and a fifth support side plate (292) on both sides along the length direction of the core (410). The sixth separator (290) and the seventh separator (2110) are connected by the second separator base plate (2100), and the eighth separator (2120) is disposed on the second separator base plate (2100). The sixth separator (290) and the seventh separator (2110) are disposed between the core (410) and the shell (100) to separate the core (410) and the shell (100). The eighth separator (2120) is disposed in the gap (420) to separate adjacent cores (410).

10. The battery cell according to claim 9, characterized in that, The number of cores (410) is m, and the number of eighth separators (2120) is m-1, where m>2.

11. An electrical appliance, characterized in that, Includes the battery cell described in any one of claims 1-10.

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