Battery monomer, battery pack and electric equipment
By placing a groove structure on the pole ear of the battery cell to form a groove channel, the problems of difficulty in filling the electrolyte and poor wetting uniformity are solved, and the battery consistency and electrical performance are improved.
Patent Information
- Application Number
- CN202421341457.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-12
AI Technical Summary
In the existing battery technology, the dense conductive end makes it difficult to inject the electrolyte, resulting in long wetting time and poor uniformity, affecting the consistency and electrical performance of the battery.
By placing a groove structure on the positive electrode ear and the negative electrode ear, the positive electrode sheet and the negative electrode sheet are wound to form a groove channel, thereby achieving rapid conduction and uniform immersion of the electrolyte.
The rapid conduction and uniform soaking of the electrolyte inside the battery cell is achieved, which improves the battery consistency and electrical performance, and at the same time improves the interface effect of the battery cell.
Smart Images
Figure CN222749529U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery pack and an electrical device. Background Art
[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.
[0003] In the related technology, the two end ears of the battery are set into dense conductive ends by flattening, and then electrically connected by welding with the current collector. However, the dense conductive ends make it difficult to inject liquid into the entire battery, and the internal infiltration time after injection is long and the uniformity is poor, which has a negative impact on the battery consistency and electrical performance. Utility Model Content
[0004] The purpose of the embodiments of the present application is to provide a battery cell, a battery pack and an electrical device, which can achieve rapid conduction of electrolyte inside the battery cell, accelerate the injection process, achieve rapid and good electrolyte infiltration, and have good uniformity, which is beneficial to the consistency of the battery cell and the performance of electrical performance.
[0005] In the first aspect, an embodiment of the present application provides a battery cell, comprising: a positive electrode plate, comprising a positive electrode tab and a positive electrode coating, wherein a positive electrode insulating layer is disposed on a side of the positive electrode tab close to the positive electrode coating, so that the positive electrode tab forms a positive electrode flattening area and a positive electrode insulating coating area, and the positive electrode flattening area is located outside the positive electrode insulating coating area and away from the positive electrode coating side; a negative electrode plate, comprising a negative electrode tab and a negative electrode coating, wherein a negative electrode insulating layer is disposed on a side of the negative electrode tab close to the negative electrode coating, so that the negative electrode tab forms a negative electrode flattening area and a negative electrode insulating coating area, and the negative electrode flattening area is located outside the negative electrode insulating coating area and away from the negative electrode coating side; a groove structure, which is disposed on the positive electrode tab and / or the negative electrode tab, so that the positive electrode plate and the negative electrode plate are wound to form a groove channel.
[0006] In the above-mentioned implementation process, the positive electrode sheet is configured with a positive electrode ear and a positive electrode coating, the positive electrode ear includes a positive electrode flattened area and a positive electrode insulating coating area, the negative electrode sheet is configured with a negative electrode ear and a negative electrode coating, the negative electrode ear includes a negative electrode flattened area and a negative electrode insulating coating area, and the groove structure is configured on the positive electrode ear and / or the negative electrode ear, so that after the positive electrode sheet and the negative electrode sheet are wound, and the positive electrode flattened area and the negative electrode flattened area are squeezed and kneaded into a dense conductive end, a groove channel can still be formed, so that when the electrolyte is injected into the battery cell, the electrolyte can be quickly conducted inside the battery cell through the groove channel, the injection process is accelerated, and fast and good electrolyte infiltration is achieved with good uniformity, which is beneficial to the consistency of the battery cell and the performance of electrical performance.
[0007] In some embodiments, a plurality of the groove structures are arranged at intervals along the length direction of the positive electrode sheet, and after the positive electrode sheet is wound, the positions of the plurality of the groove structures overlap with each other.
[0008] In the above-mentioned implementation process, the positive electrode ear of the positive electrode sheet is configured with a plurality of groove structures, so that after the positive electrode sheet and the negative electrode sheet are connected in a winding manner, the positions of the plurality of groove structures can overlap with each other, so that when the positive electrode flattening area of the positive electrode sheet is flattened, a groove channel can still be formed on the positive electrode sheet, thereby realizing rapid conduction of the electrolyte inside the battery cell, accelerating the injection process, and realizing rapid and good electrolyte infiltration with good uniformity, which is beneficial to the consistency and electrical performance of the battery cell; at the same time, the gas generated during the formation process can also be smoothly discharged through the groove channel, which can improve the interface effect of the positive electrode sheet of the battery cell.
[0009] In some embodiments, the groove structure extends along the width direction of the positive electrode plate to the positive electrode insulation layer interval, and the depth of the groove structure is not greater than the width of the positive electrode tab.
[0010] In the above-mentioned implementation process, the groove structure extends to the positive electrode insulation layer area, which can avoid the generation of burrs in the area near the positive electrode coating area during the cutting process, and can enhance the strength of the positive electrode ear, avoid the stress of the positive electrode ear during the flattening process to pull and deform the collector in the positive electrode insulation coating area, and improve the reliability of the battery cell.
[0011] In some embodiments, a plurality of the groove structures are arranged at intervals along the length direction of the negative electrode sheet, and after the negative electrode sheet is wound, the positions of the plurality of groove structures overlap with each other.
[0012] In the above-mentioned implementation process, the negative electrode ear of the negative electrode sheet is configured with a plurality of groove structures, so that after the positive electrode sheet and the negative electrode sheet are connected in a winding manner, the positions of the plurality of groove structures can overlap with each other, so that when the negative electrode flattening area of the negative electrode sheet is flattened, a groove channel can still be formed on the negative electrode sheet, thereby realizing rapid conduction of the electrolyte inside the battery cell, accelerating the injection process, and realizing rapid and good electrolyte infiltration with good uniformity, which is beneficial to the consistency and electrical performance of the battery cell; at the same time, the gas generated during the formation process can also be smoothly discharged through the groove channel, which can improve the interface effect of the negative electrode sheet of the battery cell.
[0013] In some embodiments, the groove structure extends along the width direction of the negative electrode plate to within the negative electrode insulation layer interval, and the depth of the groove structure is not greater than the width of the negative electrode tab.
[0014] In the above-mentioned implementation process, the groove structure extends to the negative electrode insulation layer area, which can avoid the generation of burrs in the area near the negative electrode coating area during the cutting process, and can enhance the strength of the positive electrode ear, avoid the stress of the negative electrode ear flattening process to pull and deform the collector in the negative electrode insulation coating area, and improve the reliability of the battery cell.
[0015] In some embodiments, the battery cell further comprises a separator, which is disposed between the positive electrode sheet and the negative electrode sheet. By disposing the separator between the positive electrode sheet and the negative electrode sheet, the insulation between the positive electrode sheet and the negative electrode sheet is ensured after the positive electrode sheet and the negative electrode sheet are wound, thereby preventing a short circuit caused by contact between the two electrodes.
[0016] In some embodiments, the width of the separator is greater than that of the negative electrode coating, and the two edges of the separator in the width direction do not protrude from the edges of the positive electrode insulating coating area and the negative electrode insulating coating area. The flattening depth of the positive electrode tab is not greater than the width of the positive electrode flattening area, and the flattening depth of the negative electrode tab is not greater than the width of the negative electrode flattening area. This can avoid damage to the separator during the flattening process.
[0017] In some embodiments, the battery cell further includes a rolling pin hole, wherein the rolling pin hole is in communication with the groove channel.
[0018] In a second aspect, the present application also provides a battery pack, comprising a battery cell as described in any of the above items.
[0019] Since the battery pack provided in the second embodiment of the present application includes the battery cells described in the technical solution of the first aspect, it has all the technical effects of the above embodiments and will not be repeated here.
[0020] In a third aspect, the present application also provides an electrical device, comprising the battery pack as described above.
[0021] Since the electrical equipment provided in the third embodiment of the present application includes the battery pack described in the second technical solution, it has all the technical effects of the above embodiments and will not be repeated here.
[0022] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.
[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0025] Figure 1 A schematic diagram of the structure of the positive electrode sheet of a battery cell provided in an embodiment of the present application;
[0026] Figure 2 A schematic diagram of the structure of the negative electrode sheet of a battery cell provided in an embodiment of the present application;
[0027] Figure 3 A cross-sectional view of a single-layer positive and negative electrode sheet of a battery cell provided in an embodiment of the present application;
[0028] Figure 4 A schematic diagram of the structure of a battery cell before being flattened provided in an embodiment of the present application;
[0029] Figure 5 This is a cross-sectional view of a flattened battery cell provided in an embodiment of the present application.
[0030] Reference numerals
[0031] 100, positive electrode plate; 101, positive electrode flattening area; 102, positive electrode insulating coating area; 103, positive electrode coating; 200, negative electrode plate; 201, negative electrode flattening area; 202, negative electrode insulating coating area; 203, negative electrode coating; 300, groove structure; 400, groove channel; 500, diaphragm; 600, pinhole. DETAILED DESCRIPTION
[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.
[0033] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.
[0034] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.
[0035] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or a point connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0036] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.
[0037] Example
[0038] In the full-tab cylindrical battery, the full tabs at both ends of the positive and negative electrodes of the wound core are squeezed into a flat surface to facilitate the subsequent welding of the current collector. The full-tab cylindrical battery turns the entire current collector into a tab, and the conductive path is no longer completely dependent on the tab. The current is changed from being transmitted horizontally along the tab to the current collector disc to being transmitted longitudinally along the current collector, which can greatly reduce the internal resistance of the battery cell and achieve high-rate charge and discharge performance.
[0039] During the design process, the inventor discovered that the step of flattening the full-tab tabs in the full-tab tab cylindrical battery makes the two ends of the core become a dense whole, which greatly limits the electrolyte injection speed and electrolyte infiltration rate of the full-tab tab cylindrical battery. The electrolyte flow channel in the core is very limited. The full-tab tab cylindrical battery can only slowly infiltrate the electrolyte through the pinholes on the outside and center of the core, which seriously reduces the injection speed during the battery cell preparation process. At the same time, poor electrolyte infiltration will seriously affect the electrical performance of the full-tab tab battery.
[0040] like Figure 1-Figure 5 As shown, in the first aspect, the embodiment of the present application provides a battery cell, including: a positive electrode plate 100, including a positive electrode tab and a positive electrode coating 103, wherein a positive electrode tab is provided with a positive electrode insulating layer on a side close to the positive electrode coating 103, so that the positive electrode tab forms a positive electrode flattening area 101 and a positive electrode insulating coating area 102, wherein the positive electrode flattening area 101 is located outside the positive electrode insulating coating area 102 and away from the positive electrode coating 103; a negative electrode plate 200, including a negative electrode tab and a negative electrode coating Layer 203, a negative electrode insulation layer is configured on the side of the negative electrode tab close to the negative electrode coating 203, so that the negative electrode tab forms a negative electrode flattening area 201 and a negative electrode insulation coating area 202, and the negative electrode flattening area 201 is located outside the negative electrode insulation coating area 202 and away from the negative electrode coating 203; a groove structure 300, which is configured on the positive electrode tab and / or the negative electrode tab, so that the positive electrode plate 100 and the negative electrode plate 200 are wound to form a groove channel 400.
[0041] Exemplarily, the battery cell includes but is not limited to a cylindrical battery, the positive electrode insulating layer includes but is not limited to a ceramic insulating layer, the negative electrode insulating layer includes but is not limited to a ceramic insulating layer, the width of the groove structure 300 can be specifically designed according to the type of battery cell, and should meet the largest possible current capacity, and the number of the groove structures 300 can be specifically set according to design requirements, wherein when the groove channels 400 are two, each winding layer is provided with two groove structures 300, when the groove channels 400 are three, each winding layer is provided with three groove structures 300, when the groove channels 400 are four, each winding layer is provided with four groove structures 300, and so on.
[0042] In the above-mentioned implementation process, the positive electrode sheet 100 is provided with a positive electrode ear and a positive electrode coating 103, and the positive electrode ear includes a positive electrode flattened area 101 and a positive electrode insulating coating area 102. The negative electrode sheet 200 is provided with a negative electrode ear and a negative electrode coating 203, and the negative electrode ear includes a negative electrode flattened area 201 and a negative electrode insulating coating area 202. The groove structure 300 is provided on the positive electrode ear and / or the negative electrode ear, so that after the positive electrode sheet 100 and the negative electrode sheet 200 are wound, and the positive electrode flattened area 101 and the negative electrode flattened area 201 are squeezed into a dense conductive end, a groove channel 400 can still be formed, so that when the electrolyte is injected into the battery cell, the electrolyte can be quickly conducted inside the battery cell through the groove channel 400, thereby accelerating the injection process, realizing fast and good electrolyte infiltration, and having good uniformity, which is beneficial to the consistency of the battery cell and the performance of electrical performance.
[0043] like Figure 1 As shown, the groove structures 300 are arranged at intervals along the length direction of the positive electrode sheet 100. After the positive electrode sheet 100 is wound, the positions of the groove structures 300 overlap each other, so that the groove structures 300 in the winding core are linearly connected to the innermost layer and the outermost layer of the winding core. The sizes of the groove structures 300 are configured to be consistent.
[0044] In the above-mentioned implementation process, the positive electrode ear of the positive electrode sheet 100 is configured with a plurality of groove structures 300, so that after the positive electrode sheet 100 is connected with the negative electrode sheet 200 in a winding manner, the positions of the plurality of groove structures 300 can overlap with each other, so that when the positive electrode flattening area 101 of the positive electrode sheet 100 is flattened, a groove channel 400 can still be formed on the positive electrode sheet 100, thereby realizing rapid conduction of the electrolyte inside the battery cell, accelerating the injection process, and realizing rapid and good electrolyte infiltration with good uniformity, which is beneficial to the consistency and electrical performance of the battery cell; at the same time, the gas generated during the formation process can also be smoothly discharged through the groove channel 400, which can improve the interface effect of the positive electrode sheet 100 of the battery cell.
[0045] In some embodiments, the groove structure 300 extends along the width direction of the positive electrode plate 100 to the positive electrode insulation layer interval, and the depth of the groove structure 300 is not greater than the width of the positive electrode tab, that is, the bottom of the groove structure 300 needs to extend to the positive electrode insulation coating area 102 of the positive electrode tab, so that the depth of the groove structure 300 is greater than the width of the positive electrode flattening area 101 of the positive electrode tab, which enables the groove channel 400 to be formed after the flattening process.
[0046] In the above-mentioned implementation process, the groove structure 300 extends into the positive electrode insulation layer interval, so that the groove structure 300 can avoid generating burrs in the area near the positive electrode coating area 103 during the cutting process, and can enhance the strength of the positive electrode ear, avoid the stress in the process of flattening the positive electrode ear to pull and deform the collector in the positive electrode insulation coating area 102, and improve the reliability of the battery cell.
[0047] like Figure 2 As shown, the groove structures 300 are arranged at intervals along the length direction of the negative electrode sheet 200. After the negative electrode sheet 200 is wound, the positions of the groove structures 300 overlap each other, so that the groove structures 300 in the winding core are connected to the innermost layer and the outermost layer of the winding core in a straight line. The size configuration of the groove structures 300 is consistent, and the arrangement of the positions of the groove structures 300 needs to satisfy the following relationship, with two groove structures 300 in each layer:
[0048] The thickness of the positive electrode sheet 100 is d 正 , the thickness of the negative electrode sheet 200 is d 负 , the thickness of the diaphragm 500 is d 隔膜 , let d x =d 正 +d 负 +d 隔膜 , the diameter of the winding needle is D, taking the positive electrode sheet 100 as an example, the length of the positive electrode sheet 100 is L, there are n layers of positive electrodes in the winding core, and there are 2n groove structures 300 in total. The nth groove structure 300 is named Ln, and the position of the groove structure 300 in the innermost circle of the winding core is:
[0049] The first layer has a groove structure at position 300;
[0050] L1=1 / 4πD
[0051] L2=L1+1 / 2πD
[0052] The second circle of groove structure 300 position:
[0053] L3=L2+1 / 4π(D+1×2d x )
[0054] L4=L3+1 / 2π(D+1×2d x )
[0055] The third circle opens the groove structure at position 300;
[0056] L5=L4+1 / 4π(D+2×2d x )
[0057] L6=L5+1 / 2π(D+2×d x )
[0058] The 4th circle groove structure 300 position:
[0059] L7=L6+1 / 4π(D+3×2d x )
[0060] L8=L7+1 / 2π(D+3×2d x )
[0061] The 5th circle groove structure 300 position:
[0062] L9=L8+1 / 4π(D+4×2d x )
[0063] L 10 =L9+1 / 2π(D+4×2d x )
[0064] …and so on
[0065] The nth circle of groove structure 300 position;
[0066] L 2n-1 =L 2n-2 +1 / 4π(D+(2n-1)×2d x )
[0067] L 2n =L 2n-1 +1 / 2π(D+(2n-1)×2d x ).
[0068] In the above-mentioned implementation process, the negative electrode ear of the negative electrode sheet 200 is configured with a plurality of groove structures 300, so that after the positive electrode sheet 100 and the negative electrode sheet 200 are connected in a winding manner, the positions of the plurality of groove structures 300 can overlap with each other, so that when the negative electrode flattening area 201 of the negative electrode sheet 200 is flattened, a groove channel 400 can still be formed on the negative electrode sheet 200, thereby realizing rapid conduction of the electrolyte inside the battery cell, accelerating the injection process, and realizing rapid and good electrolyte infiltration with good uniformity, which is beneficial to the consistency and electrical performance of the battery cell; at the same time, the gas generated during the formation process can also be smoothly discharged through the groove channel 400, which can improve the interface effect of the negative electrode sheet 200 of the battery cell.
[0069] In some embodiments, the groove structure 300 extends along the width direction of the negative electrode plate 200 into the negative electrode insulation layer interval, and the depth of the groove structure 300 is not greater than the width of the negative electrode tab, that is, the bottom of the groove structure 300 needs to extend to the negative electrode insulation coating area 202 of the negative electrode tab, so that the depth of the groove structure 300 is greater than the width of the negative electrode flattening area 201 of the negative electrode tab.
[0070] In the above-mentioned implementation process, the groove structure 300 extends into the negative electrode insulation layer interval, so that the groove structure 300 can avoid generating burrs in the area near the positive electrode coating area 203 during the cutting process, and can enhance the strength of the negative electrode tab, avoid the stress of the negative electrode tab being pulled and deformed in the negative electrode insulation coating area 202 during the flattening process, and improve the reliability of the battery cell.
[0071] like Figure 3 As shown, the battery cell further includes a separator 500, and the separator 500 is disposed between the positive electrode sheet 100 and the negative electrode sheet 200. By disposing the separator 500 between the positive electrode sheet 100 and the negative electrode sheet 200, the insulation between the positive electrode sheet 100 and the negative electrode sheet 200 is ensured after the positive electrode sheet 100 and the negative electrode sheet 200 are wound, thereby preventing a short circuit caused by contact between the two electrodes.
[0072] Please refer to Figure 3 , the width of the separator 500 should be greater than the negative electrode coating, and the two edges of the separator 500 in the width direction should not protrude from the edges of the positive electrode insulation layer coating area 102 and the negative electrode insulation layer coating area 202. The flattening depth of the positive electrode tab is not greater than the width of the positive electrode flattening area 101, and the flattening depth of the negative electrode tab is not greater than the width of the negative electrode flattening area 201. It can avoid damage to the separator 500 during the flattening process.
[0073] In some embodiments, the battery cell further includes a rolling pin hole 600 , and the rolling pin hole 600 is communicated with the groove channel 400 .
[0074] In a second aspect, the present application also provides a battery pack, comprising the battery cell as described above.
[0075] Since the battery pack provided in the second embodiment of the present application includes the battery cells described in the technical solution of the first aspect, it has all the technical effects of the above embodiments and will not be repeated here.
[0076] In a third aspect, the present application also provides an electrical device, comprising the battery pack as described above.
[0077] The electrical equipment may be, but is not limited to, mobile phones, tablet computers, laptop computers, electric toys, electric tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Among them, the electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and the spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.
[0078] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.
[0079] The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. A battery pack is provided inside the vehicle, and the battery pack may be provided at the bottom, head or tail of the vehicle. The battery pack may be used to power the vehicle. For example, the battery pack may be used as an operating power source for the vehicle and for the circuit system of the vehicle, such as for the starting, navigation and operation of the vehicle.
[0080] The vehicle may also include a controller and a motor, wherein the controller is used to control the battery pack to provide power to the motor, for example, for starting, navigating, and operating power requirements of the vehicle during driving.
[0081] In some embodiments of the present application, the battery pack can be used not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.
[0082] Since the electrical equipment provided in the third embodiment of the present application includes the battery pack described in the second technical solution, it has all the technical effects of the above embodiments and will not be repeated here.
[0083] In all the embodiments of the present application, "big" and "small" are relative, "more" and "less" are relative, and "up" and "down" are relative. The expressions of such relative terms are not elaborated in the embodiments of the present application.
[0084] It should be understood that the "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.
[0085] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
[0086] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A battery cell, characterized in that: include: A positive electrode sheet, comprising a positive electrode tab and a positive electrode coating, wherein a positive electrode insulating layer is disposed on a side of the positive electrode tab close to the positive electrode coating, so that the positive electrode tab forms a positive electrode flattening area and a positive electrode insulating coating area, and the positive electrode flattening area is located outside the positive electrode insulating coating area and away from the positive electrode coating; A negative electrode sheet, comprising a negative electrode tab and a negative electrode coating, wherein a negative electrode insulating layer is disposed on a side of the negative electrode tab close to the negative electrode coating, so that the negative electrode tab forms a negative electrode flattening area and a negative electrode insulating coating area, and the negative electrode flattening area is located outside the negative electrode insulating coating area and away from the negative electrode coating; A groove structure is arranged on the positive electrode tab and / or the negative electrode tab so that the positive electrode sheet and the negative electrode sheet are wound to form a groove channel.
2. The battery cell according to claim 1, characterized in that: A plurality of the groove structures are arranged at intervals along the length direction of the positive electrode sheet, and after the positive electrode sheet is wound, the positions of the plurality of groove structures overlap with each other.
3. The battery cell according to claim 2, characterized in that: The groove structure extends along the width direction of the positive electrode plate to the positive electrode insulation layer interval, and the depth of the groove structure is not greater than the width of the positive electrode tab.
4. The battery cell according to claim 1 or 3, characterized in that: A plurality of the groove structures are arranged at intervals along the length direction of the negative electrode sheet, and after the negative electrode sheet is wound, the positions of the plurality of groove structures overlap with each other.
5. The battery cell according to claim 4, characterized in that: The groove structure extends along the width direction of the negative electrode plate to the negative electrode insulation layer interval, and the depth of the groove structure is not greater than the width of the negative electrode tab.
6. The battery cell according to claim 5, characterized in that: The battery cell further includes a separator, and the separator is disposed between the positive electrode sheet and the negative electrode sheet.
7. The battery cell according to claim 6, characterized in that: The separator has a width greater than that of the negative electrode coating, and two edges of the separator in a width direction do not protrude beyond the edges of the positive electrode insulating coating region and the negative electrode insulating coating region.
8. The battery cell according to claim 1, characterized in that: The flattening depth of the positive electrode tab is not greater than the width of the positive electrode flattening zone, and the flattening depth of the negative electrode tab is not greater than the width of the negative electrode flattening zone.
9. The battery cell according to claim 1, characterized in that: The battery cell further includes a winding pin hole, which is communicated with the groove channel.
10. A battery pack, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 9.
11. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 10.