Battery cell, electrode assembly, pressure roller, battery, and electric device

Abstract

The utility model provides a battery monomer, an electrode assembly, a pressure roller, a battery and an electric device. The battery monomer comprises a shell, an end cover assembly, the electrode assembly and electrolyte. A containing cavity is defined by the shell, the end cover assembly covers the shell and seals the containing cavity, the electrode assembly is located in the containing cavity and comprises an electrode pole piece, the electrode pole piece comprises a first part and a second part which are arranged in the first direction, the first part comprises a plurality of first units arranged in a stacked mode, and the second part comprises a plurality of second units arranged in a stacked mode. In the arrangement direction of the first units, the maximum vertical distance between every two adjacent first units is D1, in the arrangement direction of the second units, the maximum vertical distance between every two adjacent second units is D2, and D1 is larger than D2. The electrolyte is located in the containing cavity and infiltrates the first part and the second part. The structural arrangement of the electrode assembly of the battery monomer provided by the embodiment of the utility model is beneficial to keeping the uniformity of electrolyte infiltration of the electrode assembly in work.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, an electrode assembly, a battery, 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] However, in the related art, the electrolyte infiltrated at different positions of the electrode assembly of the battery cell during operation is often not uniform. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, an electrode assembly, a battery and an electrical device. The battery cell provided in the embodiments of the present application improves the uniformity of the electrolyte infiltration of the electrode assembly.

[0005] The embodiment of the present application provides a battery cell, which includes a shell, an end cap assembly, an electrode assembly, and an electrolyte. The shell is enclosed to form a receiving cavity, the end cap assembly is covered on the shell and closes the receiving cavity, the electrode assembly is located in the receiving cavity, the electrode assembly includes an electrode plate, the electrode plate includes a first part and a second part arranged along a first direction, the first part is arranged close to the end cap assembly relative to the second part, the electrolyte is located in the receiving cavity and infiltrates the first part and the second part, the first part includes a plurality of stacked first units, along the arrangement direction of the first units, the maximum vertical distance between each two adjacent first units is D1, the second part includes a plurality of stacked second units, along the arrangement direction of the second units, the maximum vertical distance between each two adjacent second units is D2, and D1 is greater than D2.

[0006] A battery cell provided by an embodiment of the present application is configured such that an electrode plate includes a first portion and a second portion arranged along a first direction, the first portion is arranged close to the end cap assembly relative to the second portion, and the first portion includes a plurality of stacked first units, along the arrangement direction of the first units, the maximum vertical distance between each two adjacent first units is D1, and the second portion includes a plurality of stacked second units, along the arrangement direction of the second units, the maximum vertical distance between each two adjacent second units is D2, D1 is greater than D2, so that more electrolyte can be stored between the first units arranged close to the end cap assembly, thereby alleviating the problem that it is difficult for the electrolyte to infiltrate the first portion, and improving the uniformity of the electrolyte infiltration into the electrode plate.

[0007] In some embodiments, along the arrangement direction of the first units, at least a portion of each first unit is disposed to protrude toward the direction where another first unit is located.

[0008] A battery cell provided in an embodiment of the present application has at least a partially protruding arrangement on each first unit, and the protruding first unit can abut against an isolation member arranged beside the electrode plate, thereby increasing the maximum vertical distance between adjacent first units, effectively adjusting the distance between the first units, and the implementation method is simple.

[0009] In some embodiments, each first unit includes a plurality of first protrusions, and along the arrangement direction of the first units, the first protrusions are recessed from one side of the first unit and protrude from the other side. Each second unit includes a plurality of second protrusions, and along the arrangement direction of the second units, the second protrusions are recessed from one side of the second unit and protrude from the other side. The height dimension of the first protrusion is greater than the height dimension of the second protrusion.

[0010] A battery cell provided in an embodiment of the present application can increase the maximum vertical distance between adjacent first cells by setting a first protrusion and utilizing the supporting effect of the first protrusion, thereby better improving the storage performance of the electrolyte between the first cells. Furthermore, the setting of the second protrusion can also improve the storage performance of the electrolyte between the second cells, thereby improving the charging and discharging reliability of the battery cell.

[0011] In some embodiments, the heights of the first protrusions are equal, and the heights of the second protrusions are equal.

[0012] A battery cell provided in an embodiment of the present application is beneficial to improving the consistency of the maximum vertical distance between adjacent first units, thereby promoting the working reliability and stability of the first part of the electrode plate, and is beneficial to improving the consistency of the maximum vertical distance between adjacent second units, thereby promoting the working reliability and stability of the second part of the electrode plate.

[0013] In some embodiments, along the protruding direction, the outer contour shape of the orthographic projection of the first protrusion includes a curve, and / or the outer contour shape of the orthographic projection of the second protrusion includes a curve, and the first direction coincides with or intersects with the protruding direction.

[0014] A battery cell provided in an embodiment of the present application can reduce the probability of the first protrusion and / or the second protrusion causing scratches to the surrounding electrode plates by configuring the outer contour shape including curves, thereby improving the strength of the electrode assembly.

[0015] In some embodiments, along the protruding direction, the orthographic projection of the first protrusion includes a circle, and / or the orthographic projection of the second protrusion includes a circle, the first direction coincides with or intersects with the protruding direction, and the radial dimension of the orthographic projection of the first protrusion and the radial dimension of the orthographic projection of the second protrusion are between 0.5 mm and 5 mm.

[0016] A battery cell provided in an embodiment of the present application can meet the support requirements of the first protrusion and the second protrusion by setting the radial size of the orthographic projection of the first protrusion and the radial size of the orthographic projection of the second protrusion, and is also easy to prepare. The support requirements can be met without preparing too many, thereby simplifying the preparation process.

[0017] In some embodiments, along the first direction, a ratio of a height dimension of the first portion to a height dimension of the second portion is between 1:8 and 1:10.

[0018] A battery cell provided in an embodiment of the present application can expand the spacing between the isolation parts in the area of ​​the electrode assembly that is not easily wetted by the electrolyte to alleviate the phenomenon of insufficient electrolyte infiltration by setting the ratio of the height dimension of the first part to the height dimension of the second part. The above-mentioned size setting can meet the setting requirements of the first part and the second part dimensions of electrode assemblies of various sizes, thereby improving versatility.

[0019] In some embodiments, the difference between D1 and D2 is greater than 0 μm and less than or equal to 50 μm.

[0020] A battery cell provided in an embodiment of the present application improves the phenomenon that the electrolyte is not easy to penetrate the first part by setting the difference between D1 and D2, and the difference in distance is not too large to cause excessive storage of electrolyte between the first units, thereby better ensuring the uniformity of the electrolyte stored in the electrode assembly.

[0021] An embodiment of the present application also provides an electrode assembly, which includes an electrode plate, and the electrode plate includes a first part and a second part arranged along a first direction, the first part includes a plurality of stacked first units, and the second part includes a plurality of stacked second units, along the arrangement direction of the first units, the maximum vertical distance between each two adjacent first units is D1, and along the arrangement direction of the second units, the maximum vertical distance between each two adjacent second units is D2, and D1 is greater than D2.

[0022] An electrode assembly provided in an embodiment of the present application can alleviate the problem of the first part of the electrode plate being difficult to be wetted by the electrolyte by setting the maximum vertical distance D1 between each adjacent first unit and the maximum vertical distance D2 between each adjacent second unit, thereby improving the consistency of the electrolyte wetting the electrode assembly.

[0023] An embodiment of the present application also provides a pressure roller for preparing any of the electrode assemblies mentioned above, the pressure roller comprising a rolling body, the outer peripheral surface of the rolling body being provided with a plurality of protrusions, along the axial direction of the rolling body, the rolling body comprising a third part and a fourth part, along the radial direction of the rolling body, the height dimension of the plurality of protrusions located in the third part is greater than the height dimension of the plurality of protrusions located in the fourth part.

[0024] A pressure roller provided in an embodiment of the present application can produce protrusions with different depths in different areas of different electrode plates through the setting of the pressure roller structure, so that electrode assemblies in different areas have different abilities to store electrolyte, thereby improving the problem of uneven infiltration of electrolyte in the electrode assemblies.

[0025] An embodiment of the present application also provides a battery, comprising any of the above-mentioned battery cells.

[0026] A battery provided in an embodiment of the present application promotes the uniformity of electrolyte infiltration inside the battery through the structural arrangement of the electrode assembly in the battery cell, thereby improving the working stability and reliability of the battery.

[0027] An embodiment of the present application also provides an electrical device, comprising any of the above-mentioned batteries.

[0028] An electric device provided in an embodiment of the present application facilitates the smooth operation of the battery of the electric device and improves the user experience through the arrangement of the internal structure of the battery.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0031] Figure 1 It is a structural schematic diagram of a vehicle embodiment of the present application;

[0032] Figure 2 is an exploded schematic diagram of a battery embodiment of the present application;

[0033] Figure 3 is an exploded schematic diagram of an embodiment of a battery cell of the present application;

[0034] Figure 4 is a cross-sectional schematic diagram of an electrode assembly in an embodiment of a battery cell of the present application;

[0035] Figure 5 is a cross-sectional schematic diagram of an electrode assembly in another embodiment of a battery cell of the present application;

[0036] Figure 6 It is a cross-sectional schematic diagram of an embodiment of a pressure roller of the present application.

[0037] The reference numerals in the specific implementation manner are as follows:

[0038] 1 vehicle; 11 motor; 12 controller; 13 battery;

[0039] 10 battery cells;

[0040] 100 shell;

[0041] 200 end cap assembly;

[0042] 300 electrode assembly;

[0043] 310 electrode plate; X first direction;

[0044] 311 first part; 3111 first unit; A1 first protrusion;

[0045] 312 second part; 3121 second unit; A2 second protruding portion;

[0046] 320 isolation piece;

[0047] 20 box; 21 first box; 22 second box;

[0048] 30 pressure roller;

[0049] 31 rolling body; 31a third part; 31b fourth part;

[0050] 32 bulges. DETAILED DESCRIPTION

[0051] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0052] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0053] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0054] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0055] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0058] The electrode assembly is the component where electrochemical reactions occur in the battery cell. The electrolyte will infiltrate the electrode assembly. However, in the related art, the electrolyte is not easy to infiltrate along the height direction of the battery cell shell, especially the electrode assembly at a high position, which affects the reliability of the battery cell charging and discharging.

[0059] Based on the above considerations, in order to solve the above problems, it was found through research that the above problems can be solved by the structure of the battery cell, and specifically a battery cell including a shell, an end cover assembly, an electrode assembly and an electrolyte is proposed. The shell encloses a receiving cavity, the end cover assembly is covered on the shell and closes the receiving cavity, the electrode assembly is located in the receiving cavity, the electrode assembly includes an electrode plate, the electrode plate includes a first part and a second part arranged along a first direction, the first part includes a plurality of stacked first units, the second part includes a plurality of stacked second units, along the arrangement direction of the first units, the maximum vertical distance between each adjacent first unit is D1, along the arrangement direction of the second units, the maximum vertical distance between each adjacent second unit is D2, and D1 is greater than D2. The electrolyte is located in the receiving cavity and infiltrates the first part and the second part.

[0060] In a battery cell provided by an embodiment of the present application, the maximum vertical distance between each adjacent first unit is set to D1, and the maximum vertical distance between each adjacent second unit is set to D2. Although the first part of the electrode plate is difficult to be infiltrated by the electrolyte, the structural setting of D1 being greater than D2 allows more electrolyte to be stored between the first units, thereby alleviating the problem that the electrolyte is difficult to infiltrate the first part and improving the uniformity of the electrolyte infiltration into the electrode plate.

[0061] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0062] 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.

[0063] Please refer to Figure 1 As shown, Figure 11 is a schematic diagram of the structure of an embodiment of a vehicle 1 of the present application. The vehicle 1 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, etc. A battery 13 is provided inside the vehicle 1. The battery 13 may be provided at the bottom, head or tail of the vehicle 1. The battery 13 may be used to power the vehicle 1. For example, the battery 13 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 12 and a motor 11. The controller 12 is used to control the battery 13 to power the motor 11, for example, for starting, navigating and operating power requirements of the vehicle 1 during driving.

[0064] Please refer to Figure 2 As shown, Figure 2 It is an exploded schematic diagram of an embodiment of the battery 13 of the present application. In some embodiments of the present application, the battery 13 can not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0065] The battery 13 mentioned in the embodiment of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. When there are multiple battery cells 10, the multiple battery cells 10 are connected in series, in parallel or in hybrid connection through a busbar.

[0066] In some embodiments, the battery 13 may be a battery module; when there are multiple battery cells 10, the multiple battery cells 10 are arranged and fixed to form a battery module.

[0067] In some embodiments, the battery 13 may be a battery pack, which includes a case 20 and a battery cell 10 , wherein the battery cell 10 or the battery 13 module is accommodated in the case 20 .

[0068] The box 20 can adopt a variety of structures. In some embodiments, the box 20 can include a first box 21 and a second box 22, the first box 21 and the second box 22 cover each other, and the first box 21 and the second box 22 jointly define a storage space for accommodating the battery cell 10. The second box 22 can be a hollow structure with one end open, and the first box 21 can be a plate-like structure. The first box 21 covers the open side of the second box 22, so that the first box 21 and the second box 22 jointly define a storage space; the first box 21 and the second box 22 can also be hollow structures with one side open, and the open side of the first box 21 covers the open side of the second box 22. Of course, the box 20 formed by the first box 21 and the second box 22 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0069] In some embodiments, the box 20 may be a part of the chassis structure of the vehicle 1. For example, part of the box 20 may become at least a part of the floor of the vehicle 1, or part of the box 20 may become at least a part of the cross beam and longitudinal beam of the vehicle 1.

[0070] In some embodiments, the battery 13 may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0071] In the battery 13, there can be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 20; of course, the battery 13 can also be a battery 13 module formed by connecting multiple battery cells 10 in series, in parallel, or in mixed connection, and then the multiple battery 13 modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 20. The battery 13 can also include other structures, for example, the battery 13 can also include a converging component for realizing electrical connection between the multiple battery cells 10.

[0072] Please refer to Figures 3 to 5 As shown, Figure 3 is an exploded schematic diagram of an embodiment of a battery cell 10 of the present application, Figure 4 is a cross-sectional schematic diagram of an electrode assembly 300 in an embodiment of a battery cell 10 of the present application, Figure 5 1 is a cross-sectional schematic diagram of an electrode assembly 300 in another embodiment of a battery cell 10 of the present application.

[0073] In the embodiment of the present application, the battery cell 10 may be a secondary battery cell. A secondary battery cell refers to a battery cell 10 that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0074] The embodiment of the present application provides a battery cell 10, which includes a housing 100, an end cap assembly 200, an electrode assembly 300, and an electrolyte. The housing 100 encloses a receiving cavity, the end cap assembly 200 is covered on the housing 100 and closes the receiving cavity, the electrode assembly 300 is located in the receiving cavity, and the electrode assembly 300 includes an electrode plate 310, the electrode plate 310 includes a first portion 311 and a second portion 312 arranged along a first direction X, the first portion 311 includes a plurality of stacked first units 3111, the second portion 312 includes a plurality of stacked second units 3121, along the arrangement direction of the first units 3111, the maximum vertical distance between each adjacent two first units 3111 is D1, along the arrangement direction of the second units 3121, the maximum vertical distance between each adjacent two second units 3121 is D2, and D1 is greater than D2. The electrolyte is located in the receiving cavity and infiltrates the first portion 311 and the second portion 312.

[0075] During the charge and discharge process of the battery cell 10 , active ions (eg, lithium ions) are inserted and removed back and forth between the electrode plates 310 of the electrode assembly 300 .

[0076] The electrode sheet 310 may include a positive electrode sheet and a negative electrode sheet.

[0077] The positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

[0078] The end cap assembly 200 refers to a component that covers the opening of the shell 100 to isolate the internal environment of the battery cell 10 from the external environment. Optionally, the end cap assembly 200 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap assembly 200 is not easily deformed when squeezed or collided, so that the battery cell 10 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on the end cap assembly 200. The electrode terminal can be used to electrically connect to the electrode assembly 300 for outputting or inputting electrical energy of the battery cell 10.

[0079] The shell 100 is a component used to cooperate with the end cap assembly 200 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 300, the electrolyte and other components. The shell 100 and the end cap assembly 200 can be independent components, and an opening can be set on the shell 100, and the internal environment of the battery cell 10 is formed by covering the opening with the end cap assembly 200 at the opening. Without limitation, the end cap assembly 200 and the shell 100 can also be integrated. Specifically, the end cap assembly 200 and the shell 100 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 100, the end cap assembly 200 covers the shell 100. The shell 100 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 100 can be determined according to the specific shape and size of the electrode assembly 300. The shell 100 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special limitation on this.

[0080] Optionally, the first direction X includes a height direction of the housing 100 , and is directed from the end cover assembly 200 to one side of the housing 100 .

[0081] The electrode sheet 310 includes a positive electrode sheet and a negative electrode sheet, and the electrode assembly 300 includes a winding shape and a stacked shape.

[0082] If the electrode assembly 300 is wound, each first unit 3111 is wound, each second unit 3121 is wound, and the first unit 3111 is connected to the second unit 3121. The first direction X includes the axial direction of the wound electrode assembly 300.

[0083] If the electrode assembly 300 is formed by lamination, for example, each first unit 3111 of the electrode plate 310 can be arranged in a direction close to parallel with the end cap assembly 200, and each second unit 3121 of the electrode plate 310 can be arranged in a direction close to parallel with the end cap assembly 200. For example, each first unit 3111 of the electrode plate 310 can be arranged in a direction close to parallel with the large surface of the shell 100, and each second unit 3121 of the electrode plate 310 can be arranged in a direction close to parallel with the large surface of the shell 100. "Close to parallel" can be understood as that the two are arranged in parallel as a whole, and if there is an angle between the two, the angle can be ignored.

[0084] In some embodiments, the battery cell 10 further includes an isolating member 320 , and the isolating member 320 is disposed between the electrode plates 310 . The isolating member 320 is disposed between adjacent first cells 3111 and between adjacent second cells 3121 .

[0085] The structure that "the maximum vertical distance D1 between each two adjacent first units 3111 is greater than the maximum vertical distance D2 between each two adjacent second units 3121" may include providing a protrusion on the electrode plate 310. For example, a protrusion structure may be provided on the first unit 3111 and the protrusion structure may be abutted against the isolation member 320, thereby increasing the maximum vertical distance between the first unit 3111 and the isolation member 320. For example, a protrusion structure may be provided on both the first unit 3111 and the second unit 3121 and the protrusion structure may be abutted against the isolation member 320, and the protrusion height of the protrusion structure of the first unit 3111 is greater than the protrusion height of the second unit 3121. Of course, a groove may also be provided on the electrode plate 310. For example, a groove structure may be provided on the first unit 3111 to increase the value of D1 so that D1 is greater than D2.

[0086] In a battery cell 10 provided in an embodiment of the present application, the maximum vertical distance between each adjacent first unit 3111 is set to D1, and the maximum vertical distance between each adjacent second unit 3121 is set to D2. Although the first part 311 of the electrode plate 310 is difficult to be infiltrated by the electrolyte, by increasing the minimum vertical distance of the isolation member 320 that clamps the first unit 3111, more electrolyte can be stored between the isolation members 320 that clamp the first unit 3111, thereby alleviating the problem that it is difficult for the electrolyte to infiltrate the first part 311 and improving the uniformity of the electrolyte infiltration of the electrode plate 310.

[0087] In some embodiments, the separator 320 is a solid electrolyte. The solid electrolyte is disposed between the positive electrode sheet and the negative electrode sheet, and plays the role of transmitting ions and isolating the positive and negative electrodes.

[0088] In some embodiments, the separator 320 is a membrane. The present application has no particular limitation on the type of the membrane, and any known porous membrane with good chemical stability and mechanical stability can be selected.

[0089] In some embodiments, the electrode assembly 300 is provided with tabs, which can conduct current from the electrode assembly 300. The tabs include a positive tab and a negative tab.

[0090] In some embodiments, along the arrangement direction of the first units 3111 , at least a portion of each first unit 3111 is protruded toward the direction where another first unit 3111 is located.

[0091] At least a portion of each first unit 3111 is protruded toward the direction where another first unit 3111 is located, which means that at least a portion of each first unit 3111 is protruded toward the thickness direction of the first unit 3111 .

[0092] The at least partial protruding setting of the first unit 3111 may include a plurality of protrusions 32 structured on one surface of the first unit 3111 close to the isolation member 320 , or may include a protrusion 32 structure on one surface of the first unit 3111 that is recessed toward the other surface.

[0093] A battery cell 10 provided in an embodiment of the present application has at least a partially protruding arrangement on each first unit 3111, so that the protruding first unit 3111 can abut against an isolation member 320 arranged next to the electrode plate 310, thereby increasing the maximum vertical distance between adjacent first units 3111, effectively adjusting the distance between the first units 3111, and the implementation method is simple.

[0094] In some embodiments, each first unit 3111 includes a plurality of first protrusions A1, and along the arrangement direction of the first units 3111, the first protrusions A1 are recessed from one side of the first unit 3111 and protrude from the other side, and each second unit 3121 includes a plurality of second protrusions A2, and along the arrangement direction of the second units 3121, the second protrusions A2 are recessed from one side of the second unit 3121 and protrude from the other side, and the height dimension of the first protrusion A1 is greater than the height dimension of the second protrusion A2.

[0095] The shapes of the first protrusion A1 and the second protrusion A2 include but are not limited to columnar, triangular prism, or other special shapes, etc. The number of the first protrusion A1 may be the same as the number of the second protrusion A2, or may be different.

[0096] A battery cell 10 provided in an embodiment of the present application can increase the maximum vertical distance between adjacent first units 3111 by setting the first protrusion A1 and utilizing the supporting effect of the first protrusion A1, thereby better improving the storage performance of the electrolyte between the first units 3111. Furthermore, the setting of the second protrusion A2 can also improve the storage performance of the electrolyte between the second units 3121, thereby improving the charging and discharging reliability of the battery cell 10.

[0097] In some embodiments, the heights of the first protrusions A1 are equal, and the heights of the second protrusions A2 are equal.

[0098] Optionally, the height dimension of the first protrusion A1 is between 40 μm and 70 μm, and the height dimension of the second protrusion A2 is between 10 μm and 40 μm.

[0099] A battery cell 10 provided in an embodiment of the present application is beneficial to improving the consistency of the maximum vertical distance between adjacent first units 3111, thereby promoting the working reliability and stability of the first part 311 of the electrode plate 310, and is beneficial to improving the consistency of the maximum vertical distance between adjacent second units 3121, thereby promoting the working reliability and stability of the second part 312 of the electrode plate 310.

[0100] In some embodiments, along the protruding direction, the outer contour shape of the orthographic projection of the first protruding portion A1 includes a curve, and / or the outer contour shape of the orthographic projection of the second protruding portion A2 includes a curve, and the first direction X coincides with or intersects with the protruding direction.

[0101] If the shape of the electrode assembly 300 includes a wound shape, the protruding direction intersects with the first direction X.

[0102] If the shape of the electrode assembly 300 includes a laminated shape, the protruding direction coincides with or intersects with the first direction X.

[0103] The outer contour refers to the outer outline of an object or shape, that is, the outer edge outline of an object or shape.

[0104] The shape of the outer contour includes a curve. Exemplarily, the shape of the outer contour includes a circle, an ellipse, and the like.

[0105] A battery cell 10 provided in an embodiment of the present application can reduce the probability of the first protrusion A1 and / or the second protrusion A2 causing scratches to the surrounding electrode plates 310 by setting an outer contour shape including a curve, thereby improving the strength of the electrode assembly 300.

[0106] In some embodiments, along the protruding direction, the orthographic projection of the first protrusion A1 includes a circle, and / or the orthographic projection of the second protrusion A2 includes a circle, the first direction X coincides with or intersects with the protruding direction, and the radial dimension of the orthographic projection of the first protrusion A1 and the radial dimension of the orthographic projection of the second protrusion A2 are between 0.5 mm and 5 mm.

[0107] The radial dimension of the orthographic projection of the first protrusion A1 and the radial dimension of the orthographic projection of the second protrusion A2 include 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm.

[0108] The radial dimension of the orthographic projection of the first protrusion A1 and the radial dimension of the orthographic projection of the second protrusion A2 include 0.5mm, which is convenient for production, and the first protrusion A1 and the second protrusion A2 are not easy to collapse during use; the radial dimension of the orthographic projection of the first protrusion A1 and the radial dimension of the orthographic projection of the second protrusion A2 include 3mm, which is convenient for production, and the supporting strength of the first protrusion A1 and the second protrusion A2 is relatively high; the radial dimension of the orthographic projection of the first protrusion A1 and the radial dimension of the orthographic projection of the second protrusion A2 include 5mm, the supporting strength of the first protrusion A1 and the second protrusion A2 is relatively good, and the number of times the first protrusion A1 and the second protrusion A2 are produced can be adaptively reduced.

[0109] If the radial dimension of the orthographic projection of the first protrusion A1 and the radial dimension of the orthographic projection of the second protrusion A2 are less than 0.5 mm, a larger number of first protrusions A1 and second protrusions A2 are required to meet the support requirements of the isolation member 320 to adjust the spacing between adjacent first units 3111 and the spacing between adjacent second units 3121, and the production is more complicated; if the radial dimension of the orthographic projection of the first protrusion A1 and the radial dimension of the orthographic projection of the second protrusion A2 are greater than 5 mm, then during the operation of the electrode plate 310, the first protrusion A1 and the second protrusion A2 may have insufficient supporting force due to their excessive radial dimensions and may easily collapse.

[0110] A battery cell 10 provided in an embodiment of the present application can meet the support requirements of the first protrusion A1 and the second protrusion A2 by setting the radial size of the orthographic projection of the first protrusion A1 and the radial size of the orthographic projection of the second protrusion A2, and is also easy to prepare. The support requirements can be met without preparing too many, thereby simplifying the preparation process.

[0111] In some embodiments, along the first direction X, a ratio of a height dimension of the first portion 311 to a height dimension of the second portion 312 is between 1:8 and 1:10.

[0112] The ratio of the height dimension of the first portion 311 to the height dimension of the second portion 312 includes 1:8, 1:9, and 1:10.

[0113] If the ratio of the height dimension of the first part 311 to the height dimension of the second part 312 is 1:8, the area occupied by the first part 311 will not be too much to cause uneven distribution of the electrolyte between the electrode assemblies 300; if the ratio of the height dimension of the first part 311 to the height dimension of the second part 312 is 1:9, it is more conducive to ensuring that the storage amount of electrolyte between the first units 3111 and the second units 3121 is consistent; if the ratio of the height dimension of the first part 311 to the height dimension of the second part 312 is 1:10, the phenomenon of insufficient electrolyte infiltration between adjacent first units 3111 can be alleviated.

[0114] A battery cell 10 provided in an embodiment of the present application can expand the spacing between the first units 3111 in the area of ​​the electrode assembly 300 that is not easily infiltrated by the electrolyte to alleviate the phenomenon of insufficient electrolyte infiltration by setting the ratio of the height dimension of the first part 311 to the height dimension of the second part 312. The above-mentioned size setting can meet the size setting requirements of the first part 311 and the second part 312 of the electrode assemblies 300 of various sizes, thereby improving versatility.

[0115] In some embodiments, the difference between D1 and D2 is greater than 0 μm and less than or equal to 50 μm.

[0116] The difference between D1 and D2 may include 1 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm.

[0117] When the difference between D1 and D2 is 10 μm, the ability to store electrolyte between the first units can be better improved; if the difference between D1 and D2 is 30 μm, the ability to store electrolyte between the first units 3111 is improved relative to that between the second units 3121, and the uniformity of electrolyte infiltration of the electrode assembly 300 is better improved; if the difference between D1 and D2 is 50 μm, the difference between the two is not so large that the amount of electrolyte stored between the first units 3111 is too large, thereby affecting the uniformity of electrolyte infiltration of the electrode assembly 300.

[0118] A battery cell 10 provided in an embodiment of the present application improves the phenomenon that the electrolyte is not easy to penetrate the first part 311 by setting the difference between D1 and D2, and the difference in distance is not too large to cause excessive storage of electrolyte between the first units 3111, thereby better ensuring the uniformity of the stored electrolyte in the electrode assembly 300.

[0119] An embodiment of the present application provides a battery cell 10, which includes a housing 100, an end cap assembly 200, an electrode assembly 300, and an electrolyte. The housing 100 encloses a receiving cavity, the end cap assembly 200 is covered on the housing 100 and closes the receiving cavity, the electrode assembly 300 is located in the receiving cavity, and the electrode assembly 300 includes an electrode plate 310, the electrode plate 310 includes a first portion 311 and a second portion 312 arranged along a first direction X, the first portion 311 includes a plurality of stacked first units 3111, the second portion 312 includes a plurality of stacked second units 3121, along the arrangement direction of the first units 3111, the maximum vertical distance between each adjacent two first units 3111 is D1, along the arrangement direction of the second units 3121, the maximum vertical distance between each adjacent two second units 3121 is D2, and D1 is greater than D2. The electrolyte is located in the receiving cavity and infiltrates the first portion 311 and the second portion 312. Each first unit 3111 includes a plurality of first protrusions A1, which are recessed from one side of the first unit 3111 and protrude from the other side. Each second unit 3121 includes a plurality of second protrusions A2, which are recessed from one side of the second unit 3121 and protrude from the other side. The height of the first protrusion A1 is greater than the height of the second protrusion A2. The height of each first protrusion A1 is equal, and the height of each second protrusion A2 is equal. Along the protruding direction, the orthographic projection of the first protrusion A1 includes a circle, and / or, the orthographic projection of the second protrusion A2 includes a circle, the first direction X coincides with or intersects with the protruding direction, and the radial dimension of the orthographic projection of the first protrusion A1 and the radial dimension of the orthographic projection of the second protrusion A2 are between 0.5 mm and 5 mm. Along the first direction X, the ratio of the height dimension of the first part 311 to the height dimension of the second part 312 is between 1:8 and 1:10.

[0120] The embodiment of the present application also provides an electrode assembly 300, which includes an electrode plate 310. The electrode plate 310 includes a first part 311 and a second part 312 arranged along a first direction X. The first part 311 includes a plurality of stacked first units 3111, and the second part 312 includes a plurality of stacked second units 3121. Along the arrangement direction of the first units 3111, the maximum vertical distance between each two adjacent first units 3111 is D1, and along the arrangement direction of the second units 3121, the maximum vertical distance between each two adjacent second units 3121 is D2, and D1 is greater than D2.

[0121] An electrode assembly 300 provided in an embodiment of the present application can alleviate the problem of the first part 311 of the electrode plate 310 not being easily wetted by the electrolyte by setting the maximum vertical distance D1 between each adjacent first unit 3111 and the maximum vertical distance D2 between each adjacent second unit 3121, thereby improving the consistency of the electrolyte infiltration of the electrode assembly 300.

[0122] Please refer to Figure 6 As shown, Figure 6 It is a cross-sectional schematic diagram of an embodiment of the pressure roller 30 of the present application.

[0123] The embodiment of the present application also provides a pressure roller 30 for preparing any of the electrode assemblies 300 described above. The pressure roller 30 includes a rolling body 31. The outer peripheral surface of the rolling body 31 is provided with a plurality of protrusions 32. Along the axial direction of the rolling body 31, the rolling body 31 includes a third part 31a and a fourth part 31b. Along the radial direction of the rolling body 31, the height dimension of the plurality of protrusions 32 located in the third part 31a is greater than the height dimension of the plurality of protrusions 32 located in the fourth part 31b.

[0124] The roller body 31 refers to a cylindrical rotatable object in a machine.

[0125] The height of the protrusion 32 located in the third part 31a and the height of the protrusion 32 located in the fourth part 31b can be adjusted according to actual conditions. The number of protrusions 32 located in the third part 31a and the number of protrusions 32 located in the fourth part 31b can be adjusted according to actual conditions. The shapes of the multiple protrusions 32 located in the third part 31a can be consistent or inconsistent. The shapes of the multiple protrusions 32 located in the fourth part 31b can be consistent or inconsistent.

[0126] The cross-sectional dimensions of the protrusion 32 include circular, square or other special shapes.

[0127] A pressure roller 30 provided in an embodiment of the present application can produce protrusions 32 with different depths in different areas of different electrode plates 310 through the setting of the pressure roller 30 structure, so that the electrode assemblies 300 in different areas have different abilities to store electrolyte, thereby improving the problem of uneven infiltration of the electrolyte in the electrode assemblies 300.

[0128] The embodiment of the present application further provides a battery 13 , comprising any one of the battery cells 10 described above.

[0129] The battery 13 provided in one embodiment of the present application promotes the uniformity of electrolyte infiltration inside the battery 13 through the structural arrangement of the electrode assembly 300 in the battery cell 10, thereby improving the working stability and reliability of the battery 13.

[0130] The embodiment of the present application further provides an electrical device, comprising any one of the batteries 13 described above.

[0131] An electric device provided in an embodiment of the present application facilitates the smooth operation of the battery 13 of the electric device and improves the user experience through the arrangement of the internal structure of the battery 13.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A shell, enclosing to form a receiving cavity; An end cover assembly, which is disposed on the shell and closes the accommodating cavity; An electrode assembly, located in the accommodating cavity, the electrode assembly comprising an electrode plate, the electrode plate comprising a first portion and a second portion arranged along a first direction, the first portion being arranged relative to the second portion and close to the end cap assembly; An electrolyte, located in the containing cavity and infiltrating the first part and the second part; Among them, the first part includes a plurality of stacked first units, and along the arrangement direction of the first units, the maximum vertical distance between each adjacent two first units is D1; ​​the second part includes a plurality of stacked second units, and along the arrangement direction of the second units, the maximum vertical distance between each adjacent two second units is D2, and D1 is greater than D2.

2. The battery cell according to claim 1, characterized in that: Along the arrangement direction of the first units, at least a portion of each of the first units protrudes toward a direction where another first unit is located.

3. The battery cell according to claim 1, characterized in that: Each of the first units includes a plurality of first protrusions, and along the arrangement direction of the first units, the first protrusions are recessed from one side of the first unit and protrude from the other side; Each of the second units includes a plurality of second protrusions. Along the arrangement direction of the second units, the second protrusions are recessed from one side of the second unit and protrude from the other side. The height dimension of the first protrusion is greater than the height dimension of the second protrusion.

4. The battery cell according to claim 3, characterized in that: The first protrusions have the same height, and the second protrusions have the same height.

5. The battery cell according to claim 3, characterized in that: Along the protruding direction, the outer contour shape of the orthographic projection of the first protruding portion includes a curve, and / or the outer contour shape of the orthographic projection of the second protruding portion includes a curve, and the first direction coincides with or intersects with the protruding direction.

6. The battery cell according to claim 3, characterized in that: Along the protruding direction, the orthographic projection of the first protrusion includes a circle, and / or the orthographic projection of the second protrusion includes a circle, the first direction coincides with or intersects with the protruding direction, and the radial dimension of the orthographic projection of the first protrusion and the radial dimension of the orthographic projection of the second protrusion are between 0.5 mm and 5 mm.

7. The battery cell according to claim 1, characterized in that: Along the first direction, a ratio of a height dimension of the first portion to a height dimension of the second portion ranges from 1:8 to 1:

10.

8. The battery cell according to claim 1, characterized in that: The difference between D1 and D2 is greater than 0 μm and less than or equal to 50 μm.

9. An electrode assembly, characterized in that: The electrode assembly includes an electrode plate, and the electrode plate includes a first part and a second part arranged along a first direction, the first part includes a plurality of stacked first units, and the second part includes a plurality of stacked second units, along the arrangement direction of the first units, the maximum vertical distance between each adjacent two first units is D1, and along the arrangement direction of the second units, the maximum vertical distance between each adjacent two second units is D2, and D1 is greater than D2.

10. A pressure roller, characterized in that: For preparing the electrode assembly according to claim 9, the pressure roller includes a rolling body, the outer peripheral surface of the rolling body is provided with a plurality of protrusions, along the axial direction of the rolling body, the rolling body includes a third part and a fourth part, along the radial direction of the rolling body, the height dimension of the plurality of protrusions located in the third part is greater than the height dimension of the plurality of protrusions located in the fourth part.

11. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 8.

12. An electrical device, characterized in that: Comprising the battery of claim 11.

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