CN219123305U - Battery monomer, power battery and electric equipment - Google Patents

Abstract

The application provides a battery monomer, power battery and consumer relates to power battery technical field. The battery cell includes: the positive electrode plate component is provided with a positive electrode lug, and at least one positive electrode thinning area is arranged on the positive electrode plate component along the length direction of the positive electrode plate component; the negative electrode pole piece assembly is configured to be wound with the positive electrode pole piece assembly, and is provided with a negative electrode lug, and the negative electrode pole piece assembly is provided with a negative electrode thinning area corresponding to the positive electrode thinning area along the length direction of the negative electrode pole piece assembly. The positive pole piece component and the negative pole piece component are wound, the positive pole piece component forms a positive pole lug, the negative pole piece component forms a negative pole lug, the positive pole piece component is provided with a positive pole thinning area, the negative pole piece component is provided with a negative pole thinning area corresponding to the positive pole thinning area, and the battery cell has an expansion space through the arrangement of the positive pole thinning area and the negative pole thinning area, so that the performance and the service life of the battery cell can be improved.

Description

Battery monomer, power battery and electric equipment

Technical Field

The application relates to the technical field of power batteries, in particular to a battery monomer, a power battery and electric equipment.

Background

The existing ultra-long strip large-surface lithium ion battery is similar to a half-cutter battery and a blade which are all lithium iron phosphate systems; on the one hand, the ultra-long large-surface battery (the large-surface length is more than 500 mm) can be used as a mechanical structural member spandrel girder, the use of a box body supporting structural member can be reduced when the battery is integrated, and the advantages of the structure are obvious compared with those of a shell battery (the large-surface length is 100-300 mm), a soft package battery and a cylindrical battery; on the other hand, the lithium iron phosphate system has small expansion force in use cycle, can be directly clung to the ultra-long large-surface batteries when being stacked in groups, does not need to consider the expansion space of the batteries, and has good battery life.

However, if the ultra-long large-surface battery is matched with the ternary system, the edge area is subjected to excessive expansion force (the expansion force of the whole long large-surface battery is shared by the rectangular frame) due to the too large length of the rectangular frame, so that the battery performance and service life are different and water jump occurs.

Disclosure of Invention

An object of the application is to provide a battery monomer, power battery and consumer, can reserve the expansion space, can improve the performance and the life-span of battery.

In order to achieve the above purpose, the present application adopts the following technical scheme:

in a first aspect, the present application provides a battery cell comprising: the positive electrode plate component is provided with a positive electrode lug, and at least one positive electrode thinning area is arranged on the positive electrode plate component along the length direction of the positive electrode plate component; the negative electrode pole piece assembly is configured to be wound with the positive electrode pole piece assembly, and is provided with a negative electrode lug, and the negative electrode pole piece assembly is provided with a negative electrode thinning area corresponding to the positive electrode thinning area along the length direction of the negative electrode pole piece assembly.

In the process of the realization, the positive pole piece component and the negative pole piece component are wound, the positive pole piece component forms a positive pole lug, the negative pole piece component forms a negative pole lug, the positive pole piece component is provided with a positive pole thinning area, the negative pole piece component is provided with a negative pole thinning area corresponding to the positive pole thinning area, and the battery cell has an expansion space through the positive pole thinning area and the negative pole thinning area, so that the performance and the service life of the battery cell can be improved.

In some embodiments, the positive electrode thinning region includes a first positive electrode thinning region and a second positive electrode thinning region, the first positive electrode thinning region is located above the second positive electrode thinning region, and the first positive electrode thinning region and the second positive electrode thinning region are concavely disposed along a direction approaching to each other.

In the implementation process, the first positive pole thinning area is arranged above the second positive pole thinning area, and the first positive pole thinning area and the second positive pole thinning area are recessed along the direction close to each other, so that the positive pole piece component is provided with expansion spaces along the up-down direction, and the performance and the service life of the battery cell are improved.

In some embodiments, the negative electrode skiving region includes a first negative electrode skiving region and a second negative electrode skiving region, the first negative electrode skiving region is located above the second negative electrode skiving region, and the first negative electrode skiving region and the second negative electrode skiving region are concavely disposed along a direction approaching to each other.

In the implementation process, the first negative pole thinning area is arranged above the second negative pole thinning area, and the first negative pole thinning area and the second negative pole thinning area are sunken along the direction close to each other, so that the negative pole piece component is provided with expansion spaces along the upper and lower directions, and the performance and the service life of the battery cell are improved.

In some embodiments, the positive electrode sheet assembly further comprises a positive electrode flat region, at least one positive electrode skiving region being disposed between each adjacent two of the positive electrode flat regions. The positive electrode plate component is provided with the positive electrode flattening areas, and the positive electrode thinning areas are arranged between the two positive electrode flattening areas, so that the positive electrode plate component is ensured to be close to the negative electrode plate component in an initial state, and the service life of the battery cell is ensured not to be prolonged, and lithium is separated after electrolyte is squeezed out due to overlarge pressure.

In some embodiments, the length of the positive electrode leveling region is set to 200-300 mm. The method is favorable for ensuring the close connection of the positive pole piece assembly and the negative pole piece assembly, and simultaneously can reduce the expansion force of the battery cell.

In some embodiments, the negative electrode tab assembly further comprises a negative electrode planar region, the negative electrode planar region corresponds to the positive electrode planar region, and at least one negative electrode skiving region is disposed between each adjacent two of the negative electrode planar regions. The negative electrode plate component is provided with the negative electrode leveling area, and the negative electrode thinning area is arranged between the two negative electrode leveling areas, so that the negative electrode plate component is ensured to be close to the positive electrode plate component in an initial state, and the service life end of the battery cell is ensured not to be separated from lithium after the electrolyte is squeezed out due to overlarge pressure.

In some embodiments, the battery cell further comprises a separator assembly disposed between the positive electrode tab assembly and the negative electrode tab assembly. Through set up the diaphragm subassembly between anodal pole piece subassembly and negative pole piece subassembly, can guarantee the spacing of anodal pole piece subassembly and negative pole piece subassembly, guarantee the normal charge and discharge of battery monomer.

In some embodiments, the battery cell further includes a battery housing having a receiving cavity configured to receive the positive pole piece assembly and the negative pole piece assembly.

In some embodiments, the battery cell further includes a first elastic ring sleeved on the battery case, and the first elastic ring corresponds to the positive electrode skiving area and the negative electrode skiving area, respectively. Through set up first elastic ring on battery case, first elastic ring can divide into the battery monomer regional with the multistage, and first elastic ring is corresponding to anodal thinned region and negative pole thinned region, can increase the constraint of battery monomer anodal pole piece subassembly and negative pole piece subassembly, has solved the expansion that faces when the three system of battery monomer adaptation, has analyzed safety life problems such as lithium.

In some embodiments, the battery cell further comprises a second elastic ring sleeved at two ends of the battery shell. Through set up first elastic ring and second elastic ring on the battery monomer for the battery monomer is divided into multistage region, can reduce the expansion force at battery both ends and increase the constraint of the anodal pole piece subassembly in the middle of the battery monomer and negative pole piece subassembly, has solved the expansion that faces when the ternary system of battery monomer adaptation, the safety life problem such as lithium analysis, is favorable to increasing power battery's integrated energy density.

In some embodiments, the battery cell further includes a positive cap plate connected to the positive tab through a first tab.

In some embodiments, the battery cell further comprises a negative electrode cover plate connected with the negative electrode tab through a second switching piece, and at least one of the negative electrode cover plate and the positive electrode cover plate is provided with an explosion-proof valve.

In a second aspect, the present application also provides a power cell comprising a cell as defined in any one of the preceding claims.

The power battery provided in the second aspect of the present application includes the battery cell according to the first aspect, so that all the technical effects of the foregoing embodiments are achieved, and are not described herein.

In a third aspect, the present application also provides an electrical device comprising a power cell as described above.

Because the electric equipment provided by the embodiment of the third aspect of the present application includes the power battery in the technical scheme of the second aspect, all technical effects of the foregoing embodiments are provided, and are not described herein.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and that other related drawings can be obtained according to these drawings without inventive effort for the users of the art.

Fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present application.

Fig. 2 is a cross-sectional view of a battery cell disclosed in an embodiment of the present application.

Fig. 3 is a schematic view illustrating a partial structure of a battery cell according to an embodiment of the present application.

Fig. 4 is a cross-sectional view of fig. 3.

Fig. 5 is an enlarged partial schematic view of fig. 4.

Fig. 6 is another structural schematic diagram of a battery cell according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a first elastic ring or a second elastic ring of a battery cell according to an embodiment of the present disclosure.

Fig. 8 is a schematic view of a part of the structure of a power battery according to an embodiment of the present application.

Fig. 9 is a top view of a power cell disclosed in an embodiment of the present application.

Fig. 10 is a cross-sectional view of fig. 9.

Reference numerals

100. A positive pole piece assembly; 101. a positive electrode tab; 102. a first positive electrode skiving region; 103. a second positive electrode skiving region; 104. a positive electrode leveling region; 105. a first tab; 200. a negative pole piece assembly; 201. a negative electrode ear; 202. a first negative electrode skiving region; 203. a second negative electrode skiving region; 204. a negative electrode leveling region; 205. a second switching piece; 300. a diaphragm assembly; 301. aluminum foil; 302. copper foil; 400. a battery case; 401. a positive electrode cover plate; 402. a negative electrode cover plate; 500. a first elastic ring; 600. a second elastic ring; 700. an explosion-proof valve; 800. and (3) a battery cell.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person of ordinary skill in the art based on the embodiments herein, without inventive effort are intended to be within the scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships that are conventionally put in use of the inventive product, are merely for convenience of description of the present application and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood to be specific to the user of ordinary skill in the art.

Examples

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric automobiles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages, so that battery technology is an important factor related to the development of the electric automobiles.

If the expansion space is not reserved during stacking, the battery is locally pressed, electrolyte is squeezed out, lithium is separated during charging and discharging, capacity water jump and even safety accidents occur, so that the battery of the ternary system needs large-surface rectangular frame reserved expansion, and when the ultra-long large-surface battery is matched with the ternary system, the edge area is subjected to overlarge expansion force (the expansion force of the whole long large surface is shared by the rectangular frame), and the constraint of the middle area is insufficient (the clearance between pole pieces/diaphragm is overlarge and the resistance value is increased after expansion), so that the performance and the service life of the battery are different in water jump.

In view of this, as shown in fig. 1-7, in a first aspect, the present application provides a battery cell 800 comprising: the positive pole piece assembly 100 and the negative pole piece assembly 200, the positive pole piece assembly 100 is provided with a positive pole thinning area, and the negative pole piece assembly 200 is provided with a negative pole thinning area, so that when the positive pole piece assembly 100 and the negative pole piece assembly 200 are wound to form a pole coil, the positive pole thinning area corresponds to the negative pole thinning area, thereby forming an expansion space.

Specifically, the positive electrode plate assembly 100 is provided with a positive electrode lug 101, and the positive electrode plate assembly 100 is provided with at least one positive electrode thinning area along the length direction thereof; the negative electrode tab assembly 200 is configured to be wound with the positive electrode tab assembly 100, and the negative electrode tab assembly 200 has a negative electrode tab 201, and the negative electrode tab assembly 200 is provided with a negative electrode skiving area corresponding to the positive electrode skiving area along a length direction thereof.

For example, the positive electrode thinning region and the negative electrode thinning region may be formed by coating and thinning, and the dimensions of the positive electrode thinning region and the negative electrode thinning region may be set according to practical situations, for example, the dimensions are 10-30 mm; the positive electrode tab assembly 100 and the negative electrode tab assembly 200 are wound such that the lengths of the battery cells 800 are distributed along the left-right direction, and the positive electrode tab 101 is located at one side of the battery cells 800, for example, the positive electrode tab 101 is located at the left side of the battery cells 800, the negative electrode tab 201 is located at the other side of the battery cells 800, for example, the negative electrode tab 201 is located at the right side of the battery cells 800, etc.

In the present application, the battery cell 800 may include a lithium ion secondary battery cell 800, a lithium ion primary battery cell 800, a lithium sulfur battery cell 800, a sodium lithium ion battery cell 800, or the like, which is not limited in the embodiment of the present application.

The battery cell 800 includes an electrode structure including a positive electrode tab assembly 100, a negative electrode tab assembly 200, and a separator assembly 300, and an electrolyte. The battery cell 800 operates primarily by virtue of metal ions moving between the positive electrode tab assembly 100 and the negative electrode tab assembly 200. The positive electrode tab assembly 100 includes a positive electrode current collector and a positive electrode active material layer coated on a surface of the positive electrode current collector; the positive current collector comprises a positive current collecting part and a positive lug protruding out of the positive current collecting part, wherein the positive current collecting part is coated with a positive active material layer, and at least part of the positive lug is not coated with the positive active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode tab assembly 200 includes a negative electrode current collector and a negative electrode active material layer coated on a surface of the negative electrode current collector; the negative electrode current collector comprises a negative electrode current collecting part and a negative electrode tab protruding from the negative electrode current collecting part, wherein the negative electrode current collecting part is coated with a negative electrode active material layer, and at least part of the negative electrode tab is not coated with the negative electrode active material layer. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc.

In the above implementation process, the positive electrode plate assembly 100 and the negative electrode plate assembly 200 are wound, the positive electrode plate assembly 100 forms a positive electrode tab 101, the negative electrode plate assembly 200 forms a negative electrode tab 201, and the positive electrode plate assembly 100 is provided with a positive electrode thinning region, and the negative electrode plate assembly 200 is provided with a negative electrode thinning region corresponding to the positive electrode thinning region.

As shown in fig. 3 to 5, the positive electrode thinning area includes a first positive electrode thinning area 102 and a second positive electrode thinning area 103, the first positive electrode thinning area 102 is located above the second positive electrode thinning area 103, and the first positive electrode thinning area 102 and the second positive electrode thinning area 103 are concavely arranged along a direction approaching to each other. Specifically, the structural distribution of the battery cells 800 in the up-down direction is as follows: separator assembly 300, positive electrode tab assembly 100 (with first positive electrode skived zone 102), aluminum foil 301, positive electrode tab assembly 100 (with second positive electrode skived zone 103), separator assembly 300, negative electrode tab assembly 200 (with first negative electrode skived zone 202), copper foil 302, negative electrode tab assembly 200 (with second negative electrode skived zone 203), and separator assembly 300.

In the above implementation process, the first positive electrode thinning area 102 is disposed above the second positive electrode thinning area 103, and the first positive electrode thinning area 102 and the second positive electrode thinning area 103 are recessed along the directions close to each other, so that the positive electrode plate assembly 100 has expansion spaces along the up-down directions, which is beneficial to improving the performance and the service life of the battery cell 800.

Referring to fig. 3 to fig. 5, the negative electrode thinning region includes a first negative electrode thinning region 202 and a second negative electrode thinning region 203, the first negative electrode thinning region 202 is located below the second positive electrode thinning region 103, the first negative electrode thinning region 202 is located above the second negative electrode thinning region 203, and the first negative electrode thinning region 202 and the second negative electrode thinning region 203 are concavely arranged along a direction approaching to each other.

In the above implementation process, the first negative electrode skiving area 202 is disposed above the second negative electrode skiving area 203, and the first negative electrode skiving area 202 and the second negative electrode skiving area 203 are recessed along the directions close to each other, so that the negative electrode pole piece assembly 200 has expansion spaces along the up-down directions, which is beneficial to improving the performance and the service life of the battery cell 800.

Referring to fig. 3 to 5, the positive electrode sheet assembly 100 further includes a positive electrode leveling region 104, and at least one positive electrode thinning region is disposed between every two adjacent positive electrode leveling regions 104, that is, the positive electrode leveling regions 104 are located at the left and right sides of the positive electrode thinning region. By arranging the positive plate component with the positive leveling areas 104 and arranging the positive thinning areas between the two positive leveling areas 104, the approach of the positive plate component 100 and the negative plate component 200 in the initial state is ensured, and the lithium is not separated out after the electrolyte is squeezed out due to overlarge pressure at the service life end of the battery cell 800.

In some embodiments, the length of the positive electrode leveling region 104 is set to 200-300 mm. The positive electrode plate assembly 100 and the negative electrode plate assembly 200 are advantageously ensured to be close together, and simultaneously the expansion force of the battery cell 800 can be reduced.

In some embodiments, the negative electrode tab assembly 200 further includes a negative electrode flat region 204, where the negative electrode flat region 204 corresponds to the positive electrode flat region, and at least one negative electrode skiving region is disposed between every two adjacent negative electrode flat regions 204, that is, the negative electrode flat regions 204 are located on the left and right sides of the negative electrode skiving region. By arranging the anode plate component with the anode leveling area 204 and arranging the anode thinning area between the two anode leveling areas 204, the approach of the anode plate component 200 to the anode plate component 100 in the initial state is ensured, and the lithium is not separated out after the electrolyte is squeezed out due to overlarge pressure at the service life end of the battery cell 800.

In some embodiments, the battery cell 800 further includes a separator assembly 300, the separator assembly 300 being disposed between the positive electrode tab assembly 100 and the negative electrode tab assembly 200. By arranging the diaphragm assembly 300 between the positive electrode plate assembly 100 and the negative electrode plate assembly 200, the separation of the positive electrode plate assembly 100 and the negative electrode plate assembly 200 can be ensured, and the normal charge and discharge of the battery cell 800 can be ensured.

In some embodiments, the battery cell 800 further includes a battery housing 400, the battery housing 400 having a receiving cavity configured to receive the positive electrode tab assembly 100 and the negative electrode tab assembly 200.

In some embodiments, the battery unit 800 further includes a first elastic ring 500, the first elastic ring 500 is sleeved on the battery case 400, and the first elastic ring 500 corresponds to the positive electrode skiving area and the negative electrode skiving area, respectively, and illustratively, two first elastic rings 500 are provided, a distance between two first elastic rings 500 may be set to 200-300 mm, a matching manner between the first elastic ring 500 and the battery case 400 may be an interference fit or a local back glue manner, and the first elastic ring 500 includes but is not limited to silicon-based rubber. Through set up first elastic ring 500 on battery case 400, first elastic ring 500 can divide into the multistage region with battery cell 800, and first elastic ring 500 is corresponding to anodal thinned region and negative pole thinned region, can increase the constraint of anodal pole piece subassembly 100 and negative pole piece subassembly 200 of battery cell 800, has solved the expansion that faces when battery cell 800 adapts three systems, the life span problem such as lithium that separates.

In some embodiments, the battery unit 800 further includes a second elastic ring 600, where the second elastic ring 600 is sleeved at two ends of the battery case 400, and illustratively, two second elastic rings 600 are provided, one of the second elastic rings 600 is disposed at a left end of the battery case 400, the other second elastic ring 600 is disposed at a right end of the battery case 400, a distance between the second elastic ring 600 and the first elastic ring 500 may be set to be 200-300 mm, and a manner of matching the second elastic ring 600 and the battery case 400 may be an interference fit or a partial back adhesive, and the second elastic ring 600 includes but is not limited to silicon rubber. Through set up first elastic ring 500 and second elastic ring 600 on battery monomer 800 for battery monomer 800 is divided into the multistage region, can reduce the inflation power at battery both ends and increase the constraint of the anodal pole piece subassembly 100 in the middle of the battery monomer 800 and negative pole piece subassembly 200, has solved the expansion that faces when battery monomer 800 adapts the ternary system, and safety life problems such as lithium analysis are favorable to increasing power battery's integrated energy density.

In some embodiments, the battery cell 800 further includes a positive cap plate 401, the positive cap plate 401 being connected to the positive tab 101 by the first tab 105. Illustratively, the positive cover 401 includes a positive pole and a first pole, the positive pole is sleeved on the first pole, and the first pole is connected with the first switching piece 105, so that the positive pole is at the positive end.

In some embodiments, the battery cell 800 further comprises a negative cap plate 402, the negative cap plate 402 is connected to the negative tab 201 by a second switching piece 205, and at least one of the negative cap plate 402 and the positive cap plate 401 is provided with an explosion proof valve 700. Illustratively, the anode cover 402 includes an anode post and a second post, the anode post is sleeved on the second post, and the second post is connected to the second switching piece 205, so that the anode post is at the anode end.

As shown in fig. 8-10, in a second aspect, the present application also provides a power cell comprising a battery cell 800 as described in any one of the above. In the power battery, the number of battery cells 800 may be one or more. If there are multiple battery cells 800, the multiple battery cells 800 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to that there are both series connection and parallel connection among the multiple battery cells 800. The plurality of battery cells 800 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 800 is accommodated in the box body; of course, a plurality of battery units 800 may be connected in series or parallel or series-parallel to form a battery module, and then connected in series or parallel or series-parallel to form a whole and be accommodated in the case. It should be noted that, according to the self-safety performance of the ternary system (five-system, eight-system, etc.), the heat insulation protection pad is partially or fully added between the battery cells 800, and even the thickness of the heat insulation protection pad is increased by thickening the first elastic ring 500 and the second elastic ring 600, so as to improve the heat protection performance of the power battery.

The power battery provided in the second embodiment of the present application, because of including the battery cell 800 described in the first embodiment, has all the technical effects of the above embodiment, and is not described herein.

In a third aspect, the present application also provides an electrical device comprising a power cell as described above. The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric device in particular. Taking a vehicle as an example, the vehicle may further include a controller and a motor, the controller being configured to control the power battery to power the motor, for example, for operating power requirements during start-up, navigation, and travel of the vehicle.

Because the electric equipment provided by the embodiment of the third aspect of the present application includes the power battery in the technical scheme of the second aspect, all technical effects of the foregoing embodiments are provided, and are not described herein.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (14)

1. A battery cell, comprising:

the positive electrode plate component is provided with a positive electrode lug, and at least one positive electrode thinning area is arranged on the positive electrode plate component along the length direction of the positive electrode plate component;

the negative electrode pole piece assembly is configured to be wound with the positive electrode pole piece assembly, and is provided with a negative electrode lug, and the negative electrode pole piece assembly is provided with a negative electrode thinning area corresponding to the positive electrode thinning area along the length direction of the negative electrode pole piece assembly.

2. The battery cell of claim 1, wherein the positive electrode skiving region comprises a first positive electrode skiving region and a second positive electrode skiving region, the first positive electrode skiving region is located above the second positive electrode skiving region, and the first positive electrode skiving region and the second positive electrode skiving region are concavely disposed in a direction approaching each other.

3. The battery cell of claim 1, wherein the negative electrode skiving region comprises a first negative electrode skiving region and a second negative electrode skiving region, the first negative electrode skiving region is located above the second negative electrode skiving region, and the first negative electrode skiving region and the second negative electrode skiving region are concavely disposed along a direction approaching each other.

4. The battery cell of claim 1, wherein the positive electrode tab assembly further comprises a positive electrode planar region, at least one of the positive electrode skived regions being disposed between each adjacent two of the positive electrode planar regions.

5. The battery cell as recited in claim 4, wherein the length of the positive electrode flat region is set to 200-300 mm.

6. The battery cell of claim 4, wherein the negative electrode tab assembly further comprises a negative electrode planar region, the negative electrode planar region corresponds to the positive electrode planar region, and at least one negative electrode skived region is disposed between each adjacent two of the negative electrode planar regions.

7. The battery cell of claim 1, further comprising a separator assembly disposed between the positive electrode tab assembly and the negative electrode tab assembly.

8. The battery cell of claim 1, further comprising a battery housing having a receiving cavity configured to receive the positive pole piece assembly and the negative pole piece assembly.

9. The battery cell of claim 8, further comprising a first elastic ring sleeved on the battery housing, wherein the first elastic ring corresponds to the positive electrode skiving region and the negative electrode skiving region, respectively.

10. The battery cell of claim 9, further comprising a second elastic ring sleeved at both ends of the battery housing.

11. The battery cell of claim 1, further comprising a positive cover plate connected to the positive tab by a first tab.

12. The battery cell of claim 11, further comprising a negative cover plate connected to the negative electrode tab by a second tab, and at least one of the negative cover plate and the positive cover plate is provided with an explosion-proof valve.

13. A power cell comprising a cell according to any one of claims 1-12.

14. A powered device comprising the power cell of claim 13.

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