Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a battery monomer, a battery device and electric equipment, the battery monomer comprises an electrode unit and a bottom protection piece, the bottom protection piece is arranged on one side of the electrode unit along a first direction, and the first direction is the height direction of the bottom protection piece; the side, facing the electrode unit, of the bottom protection piece is provided with an avoiding area, the side, facing the bottom protection piece, of the electrode unit is provided with a convex structure, the convex structure protrudes towards the bottom protection piece and extends in the first direction, and the convex structure is contained in the avoiding area. The battery device comprises the battery monomer. The electric equipment comprises the battery. According to the battery monomer, the battery device and the electric equipment, on the basis of reducing corner lithium precipitation of the electrode unit, the internal space of the battery monomer can be fully utilized, the volume of the electrode unit is increased in a limited space, the energy density of the battery monomer is greatly improved, and the power supply performance of the battery monomer is favorably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] With the popularization and promotion of new energy vehicles, the charging and discharging performance, endurance capability and the like of new energy vehicles are increasingly attracting people's attention and attention. As the power energy of new energy vehicles, batteries are widely used.

[0003] In the existing power battery, an electrode assembly is generally packaged by a battery box body, and then electrolyte is injected to form a battery after top sealing. When the bottom of the electrode assembly lacks support, corner lithium precipitation is prone to occur. However, providing a support part at the bottom of the electrode assembly will occupy the internal height direction space of the battery cell, thereby hindering the energy density of the battery. Therefore, how to make the battery not prone to corner lithium precipitation and also consider high energy density is a problem to be solved urgently. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a battery monomer, a battery device and an electric equipment for solving the problem of how to make the battery not prone to corner lithium precipitation and also consider high energy density.

[0005] A battery monomer includes an electrode unit and a bottom guard piece. The bottom guard piece is arranged at one side of the electrode unit along a first direction, and the first direction is the height direction of the bottom guard piece. The side of the bottom guard piece facing the electrode unit is provided with a avoiding area, the side of the electrode unit facing the bottom guard piece is provided with a convex structure, the convex structure protrudes towards the bottom guard piece and extends along the first direction, and the convex structure is accommodated in the avoiding area. The battery monomer described above, the bottom guard piece is arranged at one side of the electrode unit along the first direction, and the convex structure of the electrode unit is accommodated in the avoiding area of the bottom guard piece. On the basis of reducing the case of corner lithium precipitation of the electrode unit, the internal space of the battery monomer can be fully utilized, the volume of the electrode unit can be increased in the limited space, and the energy density of the battery monomer can be greatly improved, thereby improving the power supply performance of the battery monomer.

[0006] In some embodiments, the avoiding area is configured as an avoiding slot penetrating through the bottom guard piece along the first direction, and the height of the convex structure is less than or equal to the depth of the avoiding slot. In this way, the height of the convex structure is less than or equal to the depth of the avoiding slot, so that the convex structure can be completely accommodated in the avoiding slot, the space utilization of the bottom guard piece can be improved, and the volume of the electrode unit can be increased as much as possible to improve the energy density.

[0007] In some embodiments, the side of the bottom guard facing the electrode unit further comprises a non-avoidance area, the non-avoidance area is arranged outside the avoidance area, and the non-avoidance area is at least partially stacked with the electrode unit. In this way, on the basis of reducing the corner lithium precipitation of the electrode unit, the space of the bottom guard can be fully utilized, and the volume of the electrode unit can be increased in the limited space to improve the energy density.

[0008] In some embodiments, the side of the electrode unit facing the bottom guard has a central part and a peripheral part arranged outside the central part, the peripheral part is at least partially stacked with the non-avoidance area, and the central part is configured as a convex structure. In this way, the volume of the electrode unit can be increased in the limited space, thereby improving the energy density.

[0009] In some embodiments, the electrode unit comprises at least one first electrode sheet unit and at least one second electrode sheet unit, the cathode electrode sheet, the anode electrode sheet and the separator of the first electrode sheet unit have a convex structure on the side facing the bottom guard, and the cathode electrode sheet, the anode electrode sheet and the separator of the second electrode sheet unit are flush arranged on the side facing the bottom guard. In this way, the first electrode sheet unit and the second electrode sheet unit can be flexibly arranged according to actual needs to meet different needs for the energy density and the electrode unit immersion degree of the battery cell.

[0010] In some embodiments, in each first electrode sheet unit, the outer edge of the cathode electrode sheet and the outer edge of the anode electrode sheet are arranged apart, and the outer edge of the cathode electrode sheet is surrounded by the outer edge of the anode electrode sheet. In this way, the area of the anode electrode sheet can be larger than that of the cathode electrode sheet, and lithium ions can be completely transferred from the cathode to the anode as much as possible during the charging and discharging process of the battery, so as to improve the cycle life and discharge performance of the battery.

[0011] In some embodiments, the outer edge of the cathode electrode sheet comprises a first edge and a fifth edge located in the peripheral part, and a third edge located in the central part; the outer edge of the anode electrode sheet comprises a first bottom edge and a fifth bottom edge located in the peripheral part, and a third bottom edge located in the central part; the first edge, the third edge, the fifth edge, the first bottom edge, the third bottom edge and the fifth bottom edge all extend along a second direction, the second direction being the length direction of the battery cell; the first bottom edge and the first edge are arranged apart along a first direction with a first interval, the third bottom edge and the third edge are arranged apart along the first direction with a third interval, and the fifth bottom edge and the fifth edge are arranged apart along the first direction with a fifth interval, the first interval, the third interval and the fifth interval being equal. In this way, the anode electrode sheet can be wider than the cathode electrode sheet in the first direction, and lithium ions can be completely transferred from the cathode to the anode as much as possible during the charging and discharging process of the battery, so as to improve the cycle life and discharge performance of the battery.

[0012] In some embodiments, the outer edge of the cathode tab further comprises a second edge and a fourth edge located at the central portion, and the outer edge of the anode tab further comprises a second bottom edge and a fourth bottom edge located at the central portion; the second edge, the fourth edge, the second bottom edge and the fourth bottom edge all extend along the first direction; the second bottom edge is spaced apart from the second edge by a second spacing along the second direction, and the fourth bottom edge is spaced apart from the fourth edge by a fourth spacing along the second direction, and the second spacing is equal to the fourth spacing. In this way, the anode tab can be wider than the cathode tab in the second direction, and the lithium ions can be completely transferred from the cathode to the anode during the charging and discharging process of the battery, so as to improve the cycle life and discharge performance of the battery.

[0013] In some embodiments, the second spacing is greater than or equal to the third spacing. In this way, the anode tab can be wider than the cathode tab in the first and second directions, and the lithium ions can be completely transferred from the cathode to the anode during the charging and discharging process of the battery, so as to improve the cycle life and discharge performance of the battery.

[0014] In some embodiments, in each first tab unit, the outer edge of the anode tab and the outer edge of the separator are spaced apart, and the outer edge of the anode tab is surrounded by the outer edge of the separator. In this way, the area of the separator can be larger than the area of the anode tab, and the separator can still cover the bottom of the anode and cathode tabs after being bent when the electrode unit is put into the shell, so that the bottom of the anode and cathode tabs can be effectively insulated.

[0015] In some embodiments, the outer edge of the separator comprises a first outer edge and a fifth outer edge located at the peripheral portion, and further comprises a third outer edge located at the central portion; the first outer edge, the third outer edge and the fifth outer edge all extend along the first direction; the first bottom edge is spaced apart from the first outer edge by a sixth spacing along the second direction, the third bottom edge is spaced apart from the third outer edge by an eighth spacing along the first direction, and the fifth bottom edge is spaced apart from the fifth outer edge by a tenth spacing along the first direction, and the sixth spacing, the eighth spacing and the tenth spacing are all equal. In this way, the separator can be wider than the anode tab in the first direction, and the separator can still cover the bottom of the anode and cathode tabs after being bent when the electrode unit is put into the shell, so that the bottom of the anode and cathode tabs can be effectively insulated.

[0016] In some embodiments, the outer edge of the separator further comprises a second outer edge and a fourth outer edge located at the central portion, and the second outer edge and the fourth outer edge both extend along the first direction; the second bottom edge is spaced apart from the second outer edge by a seventh spacing along the second direction, and the fourth bottom edge is spaced apart from the fourth outer edge by a ninth spacing along the second direction, and the seventh spacing is equal to the ninth spacing. In this way, the separator can be wider than the anode tab in the second direction, and the separator can still cover the bottom of the anode and cathode tabs after being bent when the electrode unit is put into the shell, so that the bottom of the anode and cathode tabs can be effectively insulated.

[0017] In some embodiments, the seventh distance is greater than or equal to the eighth distance. In this way, the spacer is wider than the anode tab in the first and second directions, which facilitates the spacer completely covering the bottom of the cathode and anode tabs when the electrode unit enters the shell, thereby improving the insulation performance of the bottom of the cathode and anode tabs.

[0018] In some embodiments, when the electrode unit is a laminated structure, the first tab unit and the second tab unit are arranged in a stacked manner along a third direction, and the third direction is a width direction of the battery cell; the electrode unit has two peripheral portions and a central portion, the two peripheral portions are arranged opposite to each other along the third direction, and the central portion is located between the two peripheral portions. In this way, the first tab unit and the second tab unit can be flexibly arranged according to actual needs to meet different needs for the energy density and the infiltration degree of the electrode unit of the battery cell.

[0019] In some embodiments, all the second tab units are located in the peripheral portions, and all the first tab units are located in the central portion. In this way, when the electrode unit is a laminated structure, the central portion of the electrode unit is designed as a convex structure, which can avoid the central portion of the electrode unit from being arranged in the bottom protection member, thereby reducing the corner lithium precipitation of the electrode unit, fully utilizing the bottom space of the central region of the battery cell, and improving the energy density of the battery cell.

[0020] In some embodiments, part of the second tab units are located in the peripheral portions, and the other part of the second tab units and all the first tab units are arranged in the central portion in an alternating and stacked manner along the third direction. In this way, when the electrode unit is a laminated structure, the central portion of the electrode unit has both the design of the convex structure and the design without the convex structure, which can avoid the central portion of the electrode unit from being arranged in the bottom protection member, thereby reducing the corner lithium precipitation of the electrode unit, reserving sufficient space in the bottom of the central region of the battery cell, and making the electrode unit easy to be infiltrated by the electrolyte.

[0021] In some embodiments, when the electrode unit is a wound structure and includes one electrode assembly, the electrode assembly has an inner ring region and an outer ring region surrounding the outer periphery of the inner ring region, the inner ring region of the electrode assembly is configured as the central portion of the electrode unit, and the outer ring region of the electrode assembly is configured as the peripheral portion of the electrode unit; the electrode assembly includes at least one first tab unit and at least one second tab unit, all the second tab units are located in the outer ring region, and all the first tab units are located in the inner ring region. In this way, when the electrode unit is a wound structure and includes one electrode assembly, the central portion of the electrode unit is designed as a convex structure, which can avoid the central portion of the electrode unit from being arranged in the bottom protection member, thereby reducing the corner lithium precipitation of the electrode unit, fully utilizing the bottom space of the central region of the battery cell, and improving the energy density of the battery cell.

[0022] In some embodiments, when the electrode unit is in a wound structure and comprises at least two electrode assemblies stacked along a third direction, the third direction is the width direction of the battery monomer; any electrode assembly has an inner ring area and an outer ring area surrounding the inner ring area, the inner ring area of any electrode assembly is configured as the central part thereof, and the outer ring area of any electrode assembly is configured as the peripheral part thereof; any electrode assembly comprises at least one first tab unit and at least one second tab unit, all the second tab units of any electrode assembly are located in the central part thereof, and all the first tab units of any electrode assembly are located in the peripheral part thereof. In this way, when the electrode unit is in a wound structure and comprises at least two electrode assemblies, the outer ring area of any electrode assembly is designed as a convex structure, which can avoid the central part of the electrode unit from being in contact with the bottom protection piece, thereby reserving sufficient space at the bottom of the battery monomer, and making the electrode unit easy to be soaked by the electrolyte.

[0023] In some embodiments, when the electrode unit is in a wound structure and comprises at least two electrode assemblies stacked along a third direction, the third direction is the width direction of the battery monomer; each electrode assembly located at the two outer sides in the third direction is configured as the peripheral part of the electrode unit, and each electrode assembly located between the two peripheral parts is configured as the central part of the electrode unit; any electrode assembly has an inner ring area and an outer ring area surrounding the inner ring area; in each electrode assembly of the peripheral part, any electrode assembly comprises at least one first tab unit and at least one second tab unit, all the second tab units are located in the outer ring area, and all the first tab units are located in the inner ring area; in each electrode assembly of the central part, any electrode assembly comprises at least one first tab unit, and the outer ring area and the inner ring area are both the first tab unit. In this way, when the electrode unit is in a wound structure and comprises at least two electrode assemblies, the outer ring area of each electrode assembly located in the peripheral part is designed as a convex structure, the inner ring area of each electrode assembly located in the peripheral part is not designed as a convex structure, and the inner ring area and the outer ring area of each electrode assembly located in the central part are designed as convex structures, thereby fully utilizing the space at the bottom of the battery monomer and improving the energy density of the battery monomer.

[0024] In some embodiments, the bottom protection piece is further provided with an auxiliary hole penetrating through the bottom protection piece along the first direction. In this way, the auxiliary hole can accommodate the hot melt adhesive or the electrolyte, thereby assisting in fixing or improving the soaking effect of the electrode unit.

[0025] In some embodiments, the battery cell further includes a thin film and a housing. The thin film wraps around the periphery of the bottom protector and the electrode unit, which are housed within the housing. Thus, by wrapping the bottom protector and the electrode unit with the thin film and then encapsulating them within the housing, the electrode unit and the housing are insulated, and the probability of overvoltage damage to the electrode unit is reduced.

[0026] A battery device includes the aforementioned battery cell. In the aforementioned battery device, a bottom cover is disposed on one side of the electrode cell along a first direction, and the convex structure of the electrode cell is housed within the clearance area of ​​the bottom cover. This reduces the occurrence of lithium plating at corners of the electrode cell, fully utilizes the internal space of the battery cell, increases the volume of the electrode cell within a limited space, significantly improves the energy density of the battery cell, and enhances the battery's power supply performance.

[0027] An electrical device includes the aforementioned battery. In the aforementioned electrical device, a bottom cover is disposed on one side of the electrode unit along a first direction. The convex structure of the electrode unit is housed within the clearance area of ​​the bottom cover. This reduces the occurrence of lithium plating at corners of the electrode unit, fully utilizes the internal space of the battery cell, increases the volume of the electrode unit within a limited space, significantly improves the energy density of the battery cell, and helps extend the battery life of the electrical device. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the electrical equipment in some embodiments of this application.

[0029] Figure 2 This is a schematic diagram of a battery device in some embodiments of this application.

[0030] Figure 3 This is an exploded view of a single battery cell in some embodiments of this application.

[0031] Figure 4 This is a schematic diagram showing the unfolded thin film and bottom cover in a battery cell in some embodiments of this application.

[0032] Figure 5 This is a schematic diagram of the battery cell assembly in the first embodiment of this application.

[0033] Figure 6 for Figure 5 The diagram shows a cross-sectional view of a single battery cell.

[0034] Figure 7 for Figure 5 The diagram shows the first electrode unit in a single battery cell.

[0035] Figure 8 This is a cross-sectional schematic diagram of a single battery cell in the second embodiment of this application.

[0036] Figure 9 A schematic view of a combination of battery cells in the third embodiment of the present application.

[0037] Figure 10 A schematic view of a combination of battery cells in the third embodiment of the present application. Figure 9 A schematic view of a cross section of the battery cell shown.

[0038] Figure 11 A schematic view of a cross section of the battery cell shown.

[0039] Figure 12 A schematic view of a cross section of the battery cell shown. Figure 11 A schematic view of a cross section of the battery cell shown.

[0040] Figure 13 A schematic view of a cross section of the battery cell shown.

[0041] Reference signs:

[0042] 10, vehicle; 11, controller; 12, motor; 20, battery device; 21a, first portion; 21b, second portion; 21, battery case; 22, battery cell; 23, housing; 23a, opening; 25, end cap assembly;

[0043] 100, electrode unit; 100a, center portion; 100b, peripheral portion; 101, electrode assembly; 101a, inner ring region; 101b, outer ring region; 110, first tab unit; 111, cathode tab; 111a, first edge; 111b, second edge; 111c, third edge; 111d, fourth edge; 111e, fifth edge; 112, anode tab; 112a, first bottom edge; 112b, second bottom edge; 112c, third bottom edge; 112d, fourth bottom edge; 112e, fifth bottom edge; 113, separator; 113a, first outer edge; 113b, second outer edge; 113c, third outer edge; 113d, fourth outer edge; 113e, fifth outer edge; 120, second tab unit; 200, bottom guard; 201, avoidance region; 202, non-avoidance region; 210, auxiliary hole; 300, film. DETAILED DESCRIPTION

[0044] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0047] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0049] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application. The orientation or position of the device or element indicated, and therefore cannot be understood as limiting the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix", and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0052] With the popularization and promotion of new energy vehicles, the charging and discharging performance, endurance capability and the like of new energy vehicles are increasingly attracting people's attention and attention. The battery, as the power source of the new energy vehicle, is widely used.

[0053] In the existing power battery, the electrode assembly is generally packaged by the battery box body, and then the electrolyte is injected and formed by top sealing. When the bottom of the electrode assembly lacks support, corner lithium precipitation is prone to occur, but setting a support part at the bottom of the electrode assembly will occupy the internal height direction space of the battery cell, hindering the energy density of the battery. Therefore, how to make the battery not prone to corner lithium precipitation and also consider high energy density is a problem that needs to be solved urgently.

[0054] Based on the above considerations, after in-depth research, the present application designs a battery monomer, a battery and an electric device. In the battery monomer, the bottom protection piece is arranged on one side of the electrode unit along the first direction, and the convex structure of the electrode unit is accommodated in the empty area of the bottom protection piece. On the basis of reducing the occurrence of corner lithium precipitation of the electrode unit, the internal space of the battery monomer can be fully utilized, the volume of the electrode unit in the limited space is increased, and the energy density of the battery monomer is greatly improved, which is beneficial to improving the power supply performance of the battery monomer.

[0055] The battery box body disclosed in the embodiments of the present application can be used in electric devices such as vehicles, ships or aircraft, but is not limited to this.

[0056] In the present application, an electric device using a battery as a power source is provided. The electric device can be, but is not limited to, a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or an extended range automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc.

[0057] The following embodiments are described by taking a vehicle 10 as an example.

[0058] Please refer to Figure 1 , Figure 1 A structural schematic diagram of the vehicle 10 is provided for some embodiments of the present application. The vehicle 10 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 10 is internally provided with a battery device 20, which can be arranged at the bottom, head or tail of the vehicle 10. The battery device 20 can be used for power supply of the vehicle 10, for example, the battery device 20 can be used as an operating power source of the vehicle 10. The vehicle 10 can further include a controller 11 and a motor 12, the controller 11 is used to control the battery device 20 to supply power to the motor 12, for example, for the working power demand of the vehicle 10 during starting, navigation and driving.

[0059] In some embodiments of the present application, the battery device 20 can not only be used as an operating power source of the vehicle 10, but also be used as a driving power source of the vehicle 10, instead of or partially instead of fuel or natural gas to provide driving force for the vehicle 10.

[0060] Please refer to Figure 2 , Figure 2 An exploded view of the battery device 20 is provided for some embodiments of the present application. The battery device 20 includes a battery box 21 and a battery monomer 22, and the battery monomer 22 is contained in the battery box 21. Among them, the battery box 21 is used to provide a containing space for the battery monomer 22. In some embodiments, the number of battery boxes 21 is two, that is, a first part 21a and a second part 21b, the first part 21a and the second part 21b are covered with each other, and the first part 21a and the second part 21b jointly define a containing space for containing the battery monomer 22. Of course, the containing space formed by the first part 21a and the second part 21b can be various shapes, such as cylinder, cuboid, etc.

[0061] In the battery device 20, the battery cells 22 can be multiple, and the multiple battery cells 22 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 22 are connected in series and in parallel. The multiple battery cells 22 can be directly connected in series, in parallel, or in a mixed connection, and then the multiple battery cells 22 are accommodated in the battery box 21. Of course, the battery device 20 can also be that the multiple battery cells 22 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the battery box 21. Each battery cell 22 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 22 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of the present application are not limited thereto.

[0062] Please refer to Figures 2 to 6 In an embodiment, the battery cell 22 includes an electrode unit 100 and a bottom protection piece 200. The bottom protection piece 200 is arranged on one side of the electrode unit 100 along a first direction, and the first direction is the height direction of the battery cell 22. The bottom protection piece 200 is provided with a reserved area 201 on the side facing the electrode unit 100. The electrode unit 100 is provided with a convex structure on the side facing the bottom protection piece 200. The convex structure protrudes towards the bottom protection piece 200 and extends along the first direction. The convex structure is accommodated in the reserved area 201.

[0063] It should be noted that the first direction is the X direction shown in Figure 5 , that is, the height direction of the battery cell 22.

[0064] In the embodiments of the present application, the bottom protection piece 200 is arranged on one side of the electrode unit 100 along the first direction, that is, the bottom protection piece 200 is arranged on the bottom side of the electrode unit 100 and is used to protect the bottom of the electrode unit 100. The bottom protection piece 200 can be a flat plate structure or a cover body structure, and the structure of the bottom protection piece 200 is not limited herein.

[0065] In the embodiments of the present application, the electrode unit 100 is a component in the battery cell 22 where an electrochemical reaction occurs. The battery cell 22 further includes a shell 23 and an end cover assembly 25. The shell 23 is a hollow cuboid or a square, and one of the planes of the shell 23 has an opening 23a. The plane is configured to have no wall so that the inside and outside of the shell 23 are in communication. The end cover assembly 25 covers the opening 23a and is connected with the shell 23 to form a closed cavity for placing the electrode unit 100. The closed cavity is filled with an electrolyte, such as an electrolyte solution. The electrode unit 100 is mainly formed by winding or stacking a cathode sheet 111 and an anode sheet 112, and a separator 113 is usually arranged between the cathode sheet 111 and the anode sheet 112. The separator 113 is a diaphragm and serves to insulate and separate the cathode sheet 111 and the anode sheet 112.

[0066] In some embodiments of the present application, the bottom protection piece 200 is provided with a relief area 201 on the side facing the electrode unit 100. The relief area 201 is a relief space provided on the bottom protection piece 200 and has at least one opening facing the electrode unit 100 for accommodating the convex structure. The relief area 201 can have various structural forms. For example, the relief area 201 is a groove provided on the side of the bottom protection piece 200 facing the electrode unit 100. The groove can extend through the bottom protection piece 200 in the first direction (i.e., a through groove extending from top to bottom), or can not extend through the bottom protection piece 200 (i.e., a blind groove extending from top to bottom and not extending through the bottom).

[0067] In some embodiments of the present application, the relief area 201 is designed in a shape matching the convex structure, i.e., the shape of the relief area 201 matches the shape of the convex structure. For example, the convex structure is square, and correspondingly, the relief area 201 is also square.

[0068] In some embodiments of the present application, the electrode unit 100 is provided with a convex structure on the side facing the bottom protection piece 200. The convex structure can be integral or discontinuous. For example, the electrode unit 100 is provided with at least two convex portions on the side facing the bottom protection piece 200, and the two convex portions are distributed side by side and spaced apart to form a discontinuous convex structure. The convex structure can have a rectangular, elliptical or other shape. The above-mentioned battery monomer 22 is provided with the bottom protection piece 200 on one side of the electrode unit 100 in the first direction, and the convex structure is accommodated in the relief area 201. On the basis of reducing the corner lithium precipitation of the electrode unit 100, the internal space of the battery monomer 22 can be fully utilized, the volume of the electrode unit 100 can be increased in the limited space, and the energy density of the battery monomer 22 can be greatly improved, which is beneficial to improving the power supply performance of the battery monomer 22.

[0069] According to some embodiments of the present application, please refer to Figure 4 and Figure 5 The relief area 201 is configured as an empty slot extending through the bottom protection piece 200 in the first direction, and the height of the convex structure is less than or equal to the depth of the empty slot.

[0070] It should be noted that the height of the convex structure is the dimension of the convex structure in the X direction shown in Figure 3 and Figure 4 The depth of the empty slot is the dimension of the empty slot in the X direction shown in Figure 3 and Figure 4 , i.e., the thickness of the bottom protection piece 200.

[0071] In the embodiments of the present application, the bottom protection piece 200 has a top surface and a bottom surface arranged oppositely in the first direction, and the avoiding area 201 is an avoiding slot penetrating from the top surface to the bottom surface. The avoiding slot can be a square slot, a circular slot or other shapes, and the shape of the avoiding slot is not limited herein.

[0072] Through the above arrangement, the height of the convex structure is less than or equal to the depth of the avoiding slot, so that the convex structure can be completely accommodated in the avoiding slot, the space utilization of the bottom protection piece 200 is improved, and the volume of the electrode unit 100 is increased as much as possible to improve the energy density.

[0073] According to some embodiments of the present application, please refer to Figure 4 and Figure 5 , the side of the bottom protection piece 200 facing the electrode unit 100 further comprises a non-avoiding area 202, the non-avoiding area 202 is arranged around the periphery of the avoiding area 201, and the non-avoiding area 202 and the electrode unit 100 are at least partially stacked.

[0074] It should be noted that the non-avoiding area 202 and the electrode unit 100 are at least partially stacked, which can be understood as: the electrode unit 100 and the bottom protection piece 200 are stacked in the first direction, and the non-avoiding area 202 and the bottom protection piece 200 are at least partially in contact.

[0075] In the embodiments of the present application, the non-avoiding area 202 is arranged around the periphery of the avoiding area 201, and in the first direction, the thickness of the avoiding area 201 is less than or equal to the thickness of the non-avoiding area 202. The non-avoiding area 202 and the avoiding area 201 can have various structural forms, for example, the avoiding area 201 is arranged in the middle region of the bottom protection piece 200, and the non-avoiding area 202 is coaxially arranged with the avoiding area 202, so that the non-avoiding area 202 can be uniformly stressed. The outer contour of the non-avoiding area 202 and the avoiding area 202 can be circular, square or other shapes.

[0076] Through the above arrangement, on the basis of reducing the corner lithium precipitation of the electrode unit 100, the space of the bottom protection piece 200 can be fully utilized, which is beneficial to increasing the volume of the electrode unit 100 in the limited space to improve the energy density.

[0077] According to some embodiments of the present application, please refer to Figure 6 and Figure 7 , the side of the electrode unit 100 facing the bottom protection piece 200 has a center part 100a and a peripheral part 100b arranged outside the center part 100a, the peripheral part 100b and the non-avoiding area 202 are at least partially stacked, and the center part 100a is configured as a convex structure.

[0078] In the embodiments of the present application, the center part 100a is configured as a convex structure, which can be understood as: the center part 100a is arranged convexly downward in the first direction.

[0079] In embodiments of the present application, the outer contour of the central portion 100a and the outer contour of the peripheral portion 100b can be circular, square or other shapes.

[0080] Through the above arrangement, the volume of the electrode unit 100 can be increased in a limited space, thereby improving the energy density.

[0081] According to some embodiments of the present application, please refer to Figure 6 and Figure 7 The electrode unit 100 includes at least one first tab unit 110 and at least one second tab unit 120. The cathode tab 111, the anode tab 112 and the separator 113 of the first tab unit 110 have a convex structure on the side facing the bottom guard 200. The cathode tab, the anode tab and the separator of the second tab unit 120 are flush on the side facing the bottom guard 200.

[0082] It can be understood that the cathode tab 111, the anode tab 112 and the separator 113 form each tab unit by winding or stacking. The part of the cathode tab 111 and the anode tab 112 having active material constitutes the main part of the battery cell assembly, and the part of the cathode tab 111 and the anode tab 112 not having active material respectively constitutes the tab. In the charging and discharging process of the battery device 20, the cathode active material and the anode active material react with the electrolyte, and the tab connects the electrode terminal to form a current loop.

[0083] In embodiments of the present application, the cathode tab 111, the anode tab 112 and the separator 113 of the first tab unit 110 have a convex structure on the side facing the bottom guard 200, that is, the bottom side of the first tab unit 110 has a central portion 100a and a peripheral portion 100b surrounding the central portion 100a, and the central portion 100a is configured as a convex structure protruding towards the bottom guard 200 and extending in the first direction. The design of the first tab unit 110 can make full use of the space at the bottom of the battery monomer 22, so that the energy density of the battery monomer 22 is improved.

[0084] In embodiments of the present application, the cathode tab, the anode tab and the separator of the second tab unit 120 are flush on the side facing the bottom guard 200, that is, the bottom side of the second tab unit 120 has a central portion 100a and a peripheral portion 100b surrounding the central portion 100a, and the central portion 100a and the peripheral portion 100b are not provided with a convex structure, and the bottom of the central portion 100a and the peripheral portion 100b are flush. The design of the second tab unit 120 can reserve enough space at the bottom of the battery monomer 22, so that the electrode unit 100 is easily soaked by the electrolyte.

[0085] In the embodiments of the present application, the number of the first tab unit 110 and the second tab unit 120 can be flexibly set according to actual needs, and the distribution mode of the first tab unit 110 and the second tab unit 120 can be flexibly set according to actual needs, so as to improve the practicability and application range of the electrode unit 100.

[0086] Through the above setting, the first tab unit 110 and the second tab unit 120 can be flexibly set according to actual needs to meet different needs of the battery monomer 22 in energy density and electrode unit 100 infiltration degree.

[0087] According to some embodiments of the present application, please refer to Figure 7 In each first tab unit 110, the outer edge of the cathode tab 111 and the outer edge of the anode tab 112 are arranged apart, and the outer edge of the cathode tab 111 is surrounded by the outer edge of the anode tab 112.

[0088] It should be noted that the arrangement apart can be understood as staggered distribution and mutual non-overlapping. The outer edge of the cathode tab 111 and the outer edge of the anode tab 112 are arranged apart, that is, the outer edge of the cathode tab 111 and the outer edge of the anode tab 112 are staggered by a certain distance and do not overlap.

[0089] In the embodiments of the present application, the outer edge of the cathode tab 111 is surrounded by the outer edge of the anode tab 112, that is, the outer edge of the anode tab 112 is wider than the outer edge of the cathode tab 111, so that the area of the anode tab 112 is larger than the area of the cathode tab 111. During the charging and discharging process of the battery device 20, lithium ions can be completely transferred from the cathode to the anode as much as possible when the lithium ions are deintercalated, so as to improve the cycle life and discharging performance of the battery device 20.

[0090] In the embodiments of the present application, the outer edge of the cathode tab 111 and the outer edge of the anode tab 112 are designed to be shaped, that is, the shape of the outer edge of the cathode tab 111 is the same as that of the outer edge of the anode tab 112. For example, the outer edge of the cathode tab 111 is in the shape of a convex character, and correspondingly, the outer edge of the anode tab 112 is also in the shape of a convex character.

[0091] Through the above setting, the area of the anode tab 112 can be larger than the area of the cathode tab 111, and during the charging and discharging process of the battery device 20, lithium ions can be completely transferred from the cathode to the anode as much as possible when the lithium ions are deintercalated, so as to improve the cycle life and discharging performance of the battery device 20.

[0092] According to some embodiments of the present application, please refer to Figure 7The outer edge of the cathode tab 111 includes a first edge 111a and a fifth edge 111e located on the peripheral portion 100b, and a third edge 111c located on the central portion 100a; the outer edge of the anode tab 112 includes a first bottom edge 112a and a fifth bottom edge 112e located on the peripheral portion 100b, and a third bottom edge 112c located on the central portion 100a; the first edge 111a, the third edge 111c, the fifth edge 111e, the first bottom edge 112a, the third bottom edge 112c and the fifth bottom edge 112e all extend along a second direction, which is the length direction of the battery cell 22; the first bottom edge 112a is spaced apart from the first edge 111a by a first interval along a first direction, the third bottom edge 112c is spaced apart from the third edge 111c by a third interval along the first direction, and the fifth bottom edge 112e is spaced apart from the fifth edge 111e by a fifth interval along the first direction; the first interval, the third interval and the fifth interval are equal.

[0093] It should be noted that the second direction is the Y direction shown in Figure 7 , that is, the length direction of the battery cell 22. The first interval is L1, the third interval is L3, and the fifth interval is L5.

[0094] In the embodiments of the present application, the first edge 111a, the third edge 111c and the fifth edge 111e all extend along the second direction (the Y direction shown in Figure 7 ), the first edge 111a and the fifth edge 111e are located on opposite sides of the third edge 111c along the second direction, the positions of the first edge 111a and the fifth edge 111e in the first direction (the X direction shown in Figure 7 ) are higher than that of the third edge 111c, and the positions of the first edge 111a and the fifth edge 111e in the first direction are flush, which facilitates uniform distribution of energy density.

[0095] In the embodiments of the present application, the first bottom edge 112a, the third bottom edge 112c and the fifth bottom edge 112e all extend along the second direction (the Y direction shown in Figure 6 ), the first bottom edge 112a and the fifth bottom edge 112e are located on opposite sides of the third bottom edge 112c along the second direction, the positions of the first bottom edge 112a and the fifth bottom edge 112e in the first direction (the X direction shown in Figure 6 ) are higher than that of the third bottom edge 112c, and the positions of the first bottom edge 112a and the fifth bottom edge 112e in the first direction are flush, which facilitates uniform distribution of energy density.

[0096] In the embodiments of this application, the first bottom edge 112a and the first edge 111a are separated by a first distance L1 along the first direction, the third bottom edge 112c and the third edge 111c are separated by a third distance L3 along the first direction, and the fifth bottom edge 112e and the fifth edge 111e are separated by a fifth distance L5 along the first direction, where L1=L3=L5>0.

[0097] With the above configuration, the anode electrode 112 can be wider than the cathode electrode 111 in the first direction, so that during the charging and discharging process of the battery device 20, lithium ions can be transferred from the cathode to the anode as completely as possible during deintercalation, thereby improving the cycle life and discharge performance of the battery device 20.

[0098] Please refer to some embodiments in this application. Figure 7 The outer edge of the cathode electrode 111 also includes a second edge 111b and a fourth edge 111d located in the central portion 100a, and the outer edge of the anode electrode 112 also includes a second bottom edge 112b and a fourth bottom edge 112d located in the central portion 100a; the second edge 111b, the fourth edge 111d, the second bottom edge 112b, and the fourth bottom edge 112d all extend along a first direction; the second bottom edge 112b and the second edge 111b are separated by a second distance along a second direction, and the fourth bottom edge 112d and the fourth edge 111d are separated by a fourth distance along a second direction, and the second distance is equal to the fourth distance.

[0099] It should be noted that the second spacing is L2 and the fourth spacing is L4.

[0100] In the embodiments of this application, the second edge 111b and the fourth edge 111d are both along the first direction ( Figure 7 Extending in the Y direction (as shown), the second edge 111b and the fourth edge 111d are located on opposite sides of the third edge 111c along the second direction, and the second edge 111b and the fourth edge 111d are both perpendicularly connected to the third edge 111c to facilitate the uniform distribution of energy density.

[0101] In the embodiments of this application, the second bottom edge 112b and the fourth bottom edge 112d are both along the first direction ( Figure 7 Extending in the Y direction (as shown), the second bottom edge 112b and the fourth bottom edge 112d are located on opposite sides of the third bottom edge 112c along the second direction, and the second bottom edge 112b and the fourth bottom edge 112d are both perpendicularly connected to the third bottom edge 112c to facilitate the uniform distribution of energy density.

[0102] In the embodiments of this application, the second bottom edge 112b and the second edge 111b are separated by a second distance L2 along the second direction, and the fourth bottom edge 112d and the fourth edge 111d are separated by a fourth distance L4 along the second direction, where L2=L4>0.

[0103] Through the above arrangement, the anode tab 112 is wider than the cathode tab 111 in the second direction, and during the charging and discharging process of the battery device 20, lithium ions can be completely transferred from the cathode to the anode when the lithium ions are deintercalated, so as to improve the cycle life and discharge performance of the battery device 20.

[0104] According to some embodiments of the present application, please refer to Figure 7 , the second distance is greater than or equal to the third distance.

[0105] It should be noted that when the second distance is greater than the third distance, L2=L4, L1=L3=L5, L2>L3; when the second distance is equal to the third distance, L2=L4=L1=L3=L5.

[0106] Through the above arrangement, the anode tab 112 is wider than the cathode tab 111 in the first and second directions, and during the charging and discharging process of the battery device 20, lithium ions can be completely transferred from the cathode to the anode when the lithium ions are deintercalated, so as to improve the cycle life and discharge performance of the battery device 20.

[0107] According to some embodiments of the present application, please refer to Figure 5 , in each first tab unit 110, the outer edge of the anode tab 112 and the outer edge of the isolation piece 113 are arranged apart, and the outer edge of the anode tab 112 is surrounded by the outer edge of the isolation piece 113.

[0108] It should be noted that the arrangement apart can be understood as staggered distribution and mutual non-overlapping. The outer edge of the anode tab 112 and the outer edge of the isolation piece 113 are arranged apart, that is, the outer edge of the anode tab 112 and the outer edge of the isolation piece 113 are staggered by a certain distance and do not overlap each other.

[0109] In the embodiments of the present application, the outer edge of the anode tab 112 is surrounded by the outer edge of the isolation piece 113, that is, the outer edge of the isolation piece 113 is wider than the outer edge of the anode tab 112, so that the area of the isolation piece 113 is larger than the area of the anode tab 112. When the electrode unit 100 is put into the shell, the isolation piece 113 can still hold the bottom of the anode and cathode tabs after being bent, so that the bottom of the anode and cathode tabs can be effectively insulated.

[0110] In the embodiments of the present application, the outer edge of the anode tab 112 and the outer edge of the isolation piece 113 are designed to be shaped, that is, the shape of the outer edge of the anode tab 112 is the same as that of the outer edge of the isolation piece 113. For example, the outer edge of the anode tab 112 is in the shape of a convex character, and correspondingly, the outer edge of the isolation piece 113 is also in the shape of a convex character.

[0111] With the above configuration, the area of ​​the insulating member 113 is larger than the area of ​​the anode plate 112. When the electrode unit 100 is inserted into the housing, the insulating member 113 can be bent to support the bottom of the anode and cathode plates, so that the bottom of the anode and cathode plates can be effectively insulated.

[0112] Please refer to some embodiments in this application. Figure 7 The outer edge of the separator 113 includes a first outer edge 113a and a fifth outer edge 113e located in the peripheral portion 100b, and a third outer edge 113c located in the central portion 100a; the first outer edge 113a, the third outer edge 113c, and the fifth outer edge 113e all extend along the second direction; the first bottom edge 112a and the first outer edge 113a are separated by a sixth spacing along the first direction, the third bottom edge 112c and the third outer edge 113c are separated by an eighth spacing along the first direction, and the fifth bottom edge 112e and the fifth outer edge 113e are separated by a tenth spacing along the first direction, and the sixth spacing, the eighth spacing, and the tenth spacing are all equal.

[0113] It should be noted that the sixth spacing is L6, the eighth spacing is L8, and the tenth spacing is L10.

[0114] In the embodiments of this application, the first outer edge 113a, the third outer edge 113c, and the fifth outer edge 113e are all along the second direction ( Figure 6 Extending in the Y direction (as shown), the first outer edge 113a and the fifth outer edge 113e are located on opposite sides of the third outer edge 113c along the second direction, and the first outer edge 113a and the fifth outer edge 113e in the first direction ( Figure 6 The position of the outer edge 113c in the X direction is higher than that of the third outer edge 113c, and the positions of the first outer edge 113a and the fifth outer edge 113e in the first direction are aligned to facilitate the uniform distribution of energy density.

[0115] In the embodiments of this application, the first bottom edge 112a and the first outer edge 113a are separated by a sixth spacing L6 along the first direction, the third bottom edge 112c and the third outer edge 113c are separated by an eighth spacing L8 along the first direction, and the fifth bottom edge 112e and the fifth outer edge 113e are separated by a tenth spacing L10 along the first direction, where L6=L8=L10>0.

[0116] With the above configuration, the insulating member 113 is wider than the anode plate 112 in the first direction. When the electrode unit 100 is inserted into the housing, the insulating member 113 can bend and cover the bottom of the anode and cathode plates, so that the bottom of the anode and cathode plates can be effectively insulated.

[0117] Please refer to some embodiments in this application. Figure 7The outer edge of the isolation piece 113 further comprises a second outer edge 113b and a fourth outer edge 113d located at the central portion 100a, the second outer edge 113b and the fourth outer edge 113d both extend along the first direction; the second bottom edge 112b is arranged apart from the second outer edge 113b along the second direction by a seventh interval, and the fourth bottom edge 112d is arranged apart from the fourth outer edge 113d along the second direction by a ninth interval, the seventh interval is equal to the ninth interval.

[0118] It should be noted that the seventh interval is L7, and the ninth interval is L9.

[0119] In the embodiments of the present application, the second outer edge 113b and the fourth outer edge 113d both extend along the first direction (Y direction shown) on the opposite sides of the third outer edge 113c along the second direction, and the second outer edge 113b and the fourth outer edge 113d are both connected to the third outer edge 113c perpendicularly, so as to facilitate uniform distribution of energy density. Figure 6

[0120] In the embodiments of the present application, the second bottom edge 112b is arranged apart from the second outer edge 113b along the second direction by a seventh interval L7, and the fourth bottom edge 112d is arranged apart from the fourth outer edge 113d along the second direction by a ninth interval L9, L7=L9>0.

[0121] Through the above arrangement, the isolation piece 113 is wider than the anode tab 112 in the second direction, and when the electrode unit 100 enters the shell, the isolation piece 113 can still cover the bottom of the cathode and anode tabs after being bent, so that the bottom of the cathode and anode tabs can be effectively insulated.

[0122] According to some embodiments of the present application, please refer to Figure 7 The seventh interval is greater than or equal to the eighth interval.

[0123] It should be noted that when the seventh interval is greater than the eighth interval, L7=L9, L6=L8=L10, L7>L8; when the seventh interval is equal to the eighth interval, L7=L9=L6=L8=L10.

[0124] Through the above arrangement, the isolation piece 113 is wider than the anode tab 112 in the first and second directions, and when the electrode unit 100 enters the shell, the isolation piece 113 can completely cover the bottom of the cathode and anode tabs, so as to improve the insulation performance of the bottom of the cathode and anode tabs.

[0125] According to some embodiments of the present application, please refer to Figure 5 and Figure 6 ​In the electrode unit 100 is a laminated structure, the first electrode sheet unit 110 and the second electrode sheet unit 120 are arranged in a third direction, and the third direction is the width direction of the battery monomer 22; the electrode unit 100 has two peripheral parts 100b and one central part 100a, the two peripheral parts 100b are arranged opposite to each other in the third direction, and the central part 100a is located between the two peripheral parts 100b.

[0126] It should be noted that the third direction is the Z direction shown in Figure 6 , that is, the width direction of the battery monomer 22. Among them, in the third direction (Z direction shown in Figure 6 and Figure 4 ), the width W2 of each peripheral part 100b is greater than or equal to the width W1 of the non-avoidance area 202 of the bottom protection piece 200.

[0127] In the embodiment of the application, the first electrode sheet unit 110 and the second electrode sheet unit 120 are arranged in the third direction, the number of the first electrode sheet unit 110 and the second electrode sheet unit 120 can be flexibly set according to actual needs, and the distribution mode of the first electrode sheet unit 110 and the second electrode sheet unit 120 can be flexibly set according to actual needs, so as to improve the practicability and application range of the electrode unit 100.

[0128] Through the above setting, the first electrode sheet unit 110 and the second electrode sheet unit 120 can be flexibly set according to actual needs, so as to meet different needs of the battery monomer 22 in energy density and electrode unit 100 infiltration degree.

[0129] According to some embodiments of the application, please refer to Figure 6 , all the second electrode sheet units 120 are located in the peripheral part 100b, and all the first electrode sheet units 110 are located in the central part 100a.

[0130] It can be understood that when the electrode unit 100 is a laminated structure, the central part 100a of the electrode unit 100 is designed as a convex structure, and the peripheral part 100b of the electrode unit 100 is not designed as a convex structure.

[0131] In the embodiment of the application, the size and shape of all the second electrode sheet units 120 are completely the same, and the size and shape of all the first electrode sheet units 110 are completely the same, which is beneficial to the performance stability of the electrode unit 100.

[0132] Through the above setting, when the electrode unit 100 is a laminated structure, the central part 100a of the electrode unit 100 is designed as a convex structure, which can make the central part 100a of the electrode unit 100 avoid the bottom protection piece 200, on the basis of reducing the corner lithium precipitation of the electrode unit 100, the bottom space of the central area of the battery monomer 22 can be fully utilized, which is beneficial to improve the energy density of the battery monomer 22.

[0133] According to some embodiments of the present application, refer to Figure 8 , part of the second pole piece units 120 are located in the peripheral part 100b, and the other part of the second pole piece units 120 and all the first pole piece units 110 are alternately stacked in the third direction in the central part 100a.

[0134] It can be understood that when the electrode unit 100 is a stacked structure, the central part 100a of the electrode unit 100 is designed to have both a convex structure and no convex structure, and the peripheral part 100b of the electrode unit 100 is not designed to have a convex structure.

[0135] In the embodiments of the present application, all the second pole piece units 120 are completely the same in size and shape, and all the first pole piece units 110 are completely the same in size and shape, which is beneficial to the stable performance of the electrode unit 100.

[0136] Through the above setting, when the electrode unit 100 is a stacked structure, the central part 100a of the electrode unit 100 is designed to have both a convex structure and no convex structure, which can avoid the central part 100a of the electrode unit 100 and the bottom protection piece 200, on the basis of reducing the corner lithium precipitation of the electrode unit 100, can reserve enough space at the bottom of the central area of the battery monomer 22, so that the electrode unit 100 is easy to be soaked by the electrolyte.

[0137] According to some embodiments of the present application, refer to Figure 9 and Figure 10 When the electrode unit 100 is a wound structure and includes one electrode assembly 101, the electrode assembly 101 has an inner ring area 101a and an outer ring area 101b surrounding the outer periphery of the inner ring area 101a, the inner ring area 101a of the electrode assembly 101 is configured as the central part 100a of the electrode unit 100, and the outer ring area 101b of the electrode assembly 101 is configured as the peripheral part 100b of the electrode unit 100; the electrode assembly 101 includes at least one first pole piece unit 110 and at least one second pole piece unit 120, all the second pole piece units 120 are located in the outer ring area 101b, and all the first pole piece units 110 are located in the inner ring area 101a.

[0138] It can be understood that when the electrode unit 100 is a wound structure, the central part 100a of the electrode unit 100 is designed to have a convex structure, and the peripheral part 100b of the electrode unit 100 is not designed to have a convex structure.

[0139] In the embodiments of the present application, the inner ring area 101a of the electrode assembly 101 is configured as the central part 100a of the electrode unit 100, and the outer ring area 101b of the electrode assembly 101 is configured as the peripheral part 100b of the electrode unit 100. Among them, in the third directionFigure 10 The width W3 of the outer ring area 101b of the electrode assembly 101 is greater than or equal to the width W1 of the non-avoidance area 202 of the bottom guard 200 in the Z direction.

[0140] In the embodiments of the present application, the sizes and shapes of all the second tab units 120 are completely identical, and the sizes and shapes of all the first tab units 110 are completely identical, which is conducive to the stable performance of the electrode unit 100.

[0141] Through the above arrangement, when the electrode unit 100 is in a wound structure and includes one electrode assembly 101, the central part 100a of the electrode unit 100 is designed to have a convex structure, which can enable the central part 100a of the electrode unit 100 to be arranged to avoid the bottom guard 200, on the basis of reducing the occurrence of corner lithium precipitation of the electrode unit 100, the bottom space of the central region of the battery monomer 22 can be fully utilized, which is conducive to improving the energy density of the battery monomer 22.

[0142] According to some embodiments of the present application, please refer to Figure 11 and Figure 12 When the electrode unit 100 is in a wound structure and includes at least two electrode assemblies 101 stacked in the third direction, the third direction is the width direction of the battery monomer 22; any electrode assembly 101 has an inner ring area 101a and an outer ring area 101b surrounding the inner ring area 101a, the inner ring area 101a of any electrode assembly 101 is configured as the central part 100a thereof, and the outer ring area 101b of any electrode assembly 101 is configured as the peripheral part 100b thereof; any electrode assembly 101 includes at least one first tab unit 110 and at least one second tab unit 120, all the second tab units 120 of any electrode assembly 101 are located in the central part 100a thereof, and all the first tab units 110 of any electrode assembly 101 are located in the peripheral part 100b thereof.

[0143] It can be understood that when the electrode unit 100 is in a wound structure, the outer ring area 101b of any electrode assembly 101 is designed to have a convex structure, and the inner ring area 101a of any electrode assembly 101 is not designed to have a convex structure.

[0144] In the embodiments of the present application, the inner ring area 101a of any electrode assembly 101 is configured as the central part 100a thereof, and the outer ring area 101b of any electrode assembly 101 is configured as the peripheral part 100b thereof. Among them, in the third direction Figure 12 The width W4 of the outer ring area 101b of the outermost electrode assembly 101 is greater than or equal to the width W1 of the non-avoidance area 202 of the bottom guard 200 in the Z direction.

[0145] In the embodiments of the present application, the sizes and shapes of all the second tab units 120 are completely same, and the sizes and shapes of all the first tab units 110 are completely same, which is beneficial to the performance stability of the electrode unit 100.

[0146] Through the above setting, when the electrode unit 100 is in a wound structure and includes at least two electrode assemblies 101, the outer ring area 101b of any electrode assembly 101 is designed as a convex structure, which can avoid the center part 100a of the electrode unit 100 from being arranged in the bottom protection piece 200. On the basis of reducing the corner lithium precipitation of the electrode unit 100, sufficient space can be reserved at the bottom of the battery monomer 22, so that the electrode unit 100 is easy to be soaked by the electrolyte.

[0147] According to some embodiments of the present application, please refer to Figure 11 and Figure 13 When the electrode unit 100 is in a wound structure and includes at least two electrode assemblies 101 arranged in a third direction, the third direction is the width direction of the battery monomer 22; each electrode assembly 101 located at the two outer sides of the third direction is configured as the two peripheral parts 100b of the electrode unit 100, and each electrode assembly 101 located between the two peripheral parts 100b is configured as the center part 100a of the electrode unit 100; any electrode assembly 101 has an inner ring area 101a and an outer ring area 101b surrounding the inner ring area 101a; in each electrode assembly 101 of the peripheral part 100b, any electrode assembly 101 includes at least one first tab unit 110 and at least one second tab unit 120, all the second tab units 120 are located in the outer ring area 101b, and all the first tab units 110 are located in the inner ring area 101a; in each electrode assembly 101 of the center part 100a, any electrode assembly 101 includes at least one first tab unit 110, and the outer ring area 101b and the inner ring area 101a are both the first tab unit 110.

[0148] It can be understood that when the electrode unit 100 is in a wound structure, the outer ring area 101b of each electrode assembly 101 located in the peripheral part 100b is designed as a convex structure, the inner ring area 101a of each electrode assembly 101 located in the peripheral part 100b is not designed as a convex structure, and the inner ring area 101a and the outer ring area 101b of each electrode assembly 101 located in the center part 100a are designed as a convex structure.

[0149] In the embodiments of the present application, each electrode assembly 101 located at the two outer sides of the third direction is configured as the two peripheral parts 100b of the electrode unit 100, and each electrode assembly 101 located between the two peripheral parts 100b is configured as the center part 100a of the electrode unit 100. Among them, in the third direction Figure 12The width W5 of the peripheral portion 100b of the electrode unit 100 is greater than or equal to the width W1 of the non-clearance area 202 of the bottom guard 200 in the Z direction.

[0150] In the embodiments of the present application, the sizes and shapes of all the second tab units 120 are completely the same, and the sizes and shapes of all the first tab units 110 are completely the same, which is conducive to the stable performance of the electrode unit 100.

[0151] Through the above arrangement, when the electrode unit 100 is in a winding structure and includes at least two electrode assemblies 101, the outer ring area 101b of each electrode assembly 101 located in the peripheral portion 100b is designed as a convex structure, the inner ring area 101a of each electrode assembly 101 located in the peripheral portion 100b is not designed as a convex structure, and the inner ring area 101a and the outer ring area 101b of each electrode assembly 101 located in the central portion 100a are designed as convex structures. On the basis of reducing the corner lithium precipitation of the electrode unit 100, the bottom space of the battery monomer 22 can be fully utilized, which is conducive to improving the energy density of the battery monomer 22.

[0152] According to some embodiments of the present application, please refer to Figure 4 The bottom guard 200 is also provided with an auxiliary hole 210, and the auxiliary hole 210 penetrates the bottom guard 200 along the first direction.

[0153] It should be noted that when assembling, the electrode unit 100 and the bottom guard 200 need to be fixed by hot melt adhesive. The arrangement of the auxiliary hole 210 can allow the hot melt adhesive to be accommodated in the auxiliary hole 210 or the electrolyte to be infiltrated in the auxiliary hole 210, thereby playing a role of auxiliary fixation or auxiliary improvement of the infiltration effect of the electrode unit 100.

[0154] In the embodiments of the present application, the number of auxiliary holes 210 is not limited to one, and the shape of the auxiliary hole 210 can be a round hole, a square hole or other shapes, and the number and shape of the auxiliary hole 210 are not limited here. When the number of auxiliary holes 210 is at least two, each auxiliary hole 210 can be distributed side by side or arranged in a matrix along the same direction or in other arrangement modes.

[0155] Through the above arrangement, the arrangement of the auxiliary hole 210 can allow the hot melt adhesive to be accommodated in the auxiliary hole 210 or the electrolyte to be infiltrated in the auxiliary hole 210, thereby playing a role of auxiliary fixation or auxiliary improvement of the infiltration effect of the electrode unit 100.

[0156] According to some embodiments of the present application, please refer to Figure 4 and Figure 5 The battery monomer 22 further includes a film 300 and a shell 23, the film 300 wraps the outer periphery of the bottom guard 200 and the electrode assembly 101, and the bottom guard 200 and the electrode assembly 101 are accommodated in the shell 23.

[0157] In the embodiments of the present application, the film 300 is wrapped around the outer periphery of the bottom guard 200 and the electrode assembly 101, and then the bottom guard 200 and the electrode assembly 101 are packaged in the shell 23, so that the electrode assembly 101 and the shell 23 are insulated, and the probability of overvoltage damage of the electrode assembly 101 is reduced. The film 300 is a Mylar film (a polyester film).

[0158] In the embodiments of the present application, the film 300 is wrapped around the outer periphery of the bottom guard 200 and the electrode unit 100, and the film 300, the bottom guard 200 and the electrode unit 100 can be further fixed by a hot melt adhesive bonding mode.

[0159] Through the above arrangement, the film 300 is wrapped around the outer periphery of the bottom guard 200 and the electrode unit 100, and then the bottom guard 200 and the electrode unit 100 are packaged in the shell 23, so that the electrode assembly 101 and the shell 23 are insulated, and the probability of overvoltage damage of the electrode unit 100 is reduced.

[0160] Please refer to Figure 2 The battery device 20 in an embodiment includes the battery cell 22 described above.

[0161] The battery device 20 described above, the bottom guard 200 is arranged on one side of the electrode unit 100 along the first direction, and the convex structure of the electrode unit 100 is accommodated in the void area 201 of the bottom guard 200. On the basis of reducing the corner lithium precipitation of the electrode unit 100, the internal space of the battery cell 22 can be fully utilized, the volume of the electrode unit 100 in the limited space is increased, the energy density of the battery cell 22 is greatly improved, and the power supply performance of the battery device 20 is improved.

[0162] Please refer to Figure 1 The power consuming device in an embodiment includes the battery device 20 described above.

[0163] The power consuming device described above, the bottom guard 200 is arranged on one side of the electrode unit 100 along the first direction, and the convex structure of the electrode unit 100 is accommodated in the void area 201 of the bottom guard 200. On the basis of reducing the corner lithium precipitation of the electrode unit 100, the internal space of the battery cell 22 can be fully utilized, the volume of the electrode unit 100 in the limited space is increased, the energy density of the battery cell 22 is greatly improved, and the power supply performance of the battery device 20 is improved.

[0164] According to some embodiments of the present application, please refer to Figures 2 to 13The application provides a battery monomer 22, the battery monomer 22 includes an electrode unit 100, a bottom guard 200, a film 300 and a shell 23, the bottom guard 200 is arranged at one side of the electrode unit 100 along a first direction, and the first direction is the height direction of the battery monomer 22; wherein the side of the bottom guard 200 towards the electrode unit 100 is provided with an avoiding area 201 and a non-avoiding area 202, the non-avoiding area 202 is surrounded outside the periphery of the avoiding area 201, the non-avoiding area 202 is at least partially stacked with the electrode unit 100, the side of the electrode unit 100 towards the bottom guard 200 is provided with a convex structure, the convex structure protrudes towards the bottom guard 200 and extends along the first direction, and the convex structure is accommodated in the avoiding area 201. The side of the electrode unit 100 towards the bottom guard 200 has a central part 100a and a peripheral part 100b arranged outside the central part 100a, the peripheral part 100b is at least partially stacked with the non-avoiding area 202, the central part 100a is configured as the convex structure, the film 300 is wrapped around the periphery of the bottom guard 200 and the electrode assembly 101, and the bottom guard 200 and the electrode assembly 101 are accommodated in the shell 23.

[0165] The electrode unit 100 includes at least one first pole piece unit 110 and at least one second pole piece unit 120, the cathode pole piece 111, the anode pole piece 112 and the separator 113 of the first pole piece unit 110 are all provided with convex structures on the side towards the bottom guard 200, and the cathode pole piece, the anode pole piece and the separator of the second pole piece unit 120 are flushly arranged on the side towards the bottom guard 200.

[0166] According to some embodiments of the application, referring to Figure 2 The application provides a battery device 20, which includes the battery monomer 22.

[0167] According to some embodiments of the application, referring to Figure 1 The application provides a power-consuming device, which includes the battery device 20.

[0168] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell (22), characterized in that, include: Electrode unit (100); A bottom protector (200) is provided on one side of the electrode unit (100) along a first direction, the first direction being the height direction of the battery cell (22); The bottom protector (200) has a clearance area (201) on the side facing the electrode unit (100), and the electrode unit (100) has a convex structure on the side facing the bottom protector (200). The convex structure protrudes towards the bottom protector (200) and extends along the first direction, and the convex structure is housed in the clearance area (201).

2. The battery cell (22) according to claim 1, characterized in that, The clearance area (201) is configured as a clearance groove penetrating the bottom guard (200) along the first direction, and the height of the convex structure is less than or equal to the depth of the clearance groove.

3. The battery cell (22) according to claim 1, characterized in that, The bottom protector (200) also includes a non-avoidance area (202) on the side facing the electrode unit (100). The non-avoidance area (202) surrounds the outer periphery of the avoidance area (201), and the non-avoidance area (202) is at least partially stacked with the electrode unit (100).

4. The battery cell (22) according to claim 3, characterized in that, The electrode unit (100) has a central portion (100a) and a peripheral portion (100b) located outside the central portion (100a) on the side facing the bottom protector (200). The peripheral portion (100b) is at least partially stacked with the non-avoidance area (202), and the central portion (100a) is configured as the convex structure.

5. The battery cell (22) according to claim 4, characterized in that, The electrode unit (100) includes at least one first electrode unit (110) and at least one second electrode unit (120). The cathode electrode (111), anode electrode (112), and separator (113) of the first electrode unit (110) all have the convex structure on the side facing the bottom cover (200). The cathode electrode, anode electrode, and separator of the second electrode unit (120) are flush with the side facing the bottom cover (200).

6. The battery cell (22) according to claim 5, characterized in that, In each of the first electrode units (110), the outer edge of the cathode electrode (111) and the outer edge of the anode electrode (112) are separated, and the outer edge of the cathode electrode (111) is surrounded by the outer edge of the anode electrode (112).

7. The battery cell (22) according to claim 6, characterized in that, The outer edge of the cathode electrode (111) includes a first edge (111a) and a fifth edge (111e) located in the peripheral portion (100b), and also includes a third edge (111c) located in the central portion (100a). The outer edge of the anode electrode (112) includes a first bottom edge (112a) and a fifth bottom edge (112e) located in the peripheral portion (100b), and also includes a third bottom edge (112c) located in the central portion (100a). The first edge (111a), the third edge (111c), the fifth edge (111e), the first bottom edge (112a), the third bottom edge (112c), and the fifth bottom edge (112e) all extend along a second direction, which is the length direction of the battery cell (22). The first bottom edge (112a) and the first edge (111a) are separated by a first spacing along the first direction, the third bottom edge (112c) and the third edge (111c) are separated by a third spacing along the first direction, and the fifth bottom edge (112e) and the fifth edge (111e) are separated by a fifth spacing along the first direction. The first spacing, the third spacing, and the fifth spacing are all equal.

8. The battery cell (22) according to claim 7, characterized in that, The outer edge of the cathode electrode (111) also includes a second edge (111b) and a fourth edge (111d) located in the central part (100a), and the outer edge of the anode electrode (112) also includes a second bottom edge (112b) and a fourth bottom edge (112d) located in the central part (100a). The second edge (111b), the fourth edge (111d), the second bottom edge (112b), and the fourth bottom edge (112d) all extend along the first direction; the second bottom edge (112b) and the second edge (111b) are separated by a second spacing along the second direction, and the fourth bottom edge (112d) and the fourth edge (111d) are separated by a fourth spacing along the second direction, wherein the second spacing is equal to the fourth spacing.

9. The battery cell (22) according to claim 8, characterized in that, The second spacing is greater than or equal to the third spacing.

10. The battery cell (22) according to claim 8, characterized in that, In each of the first electrode units (110), the outer edge of the anode electrode (112) and the outer edge of the separator (113) are separated, and the outer edge of the anode electrode (112) is surrounded by the outer edge of the separator (113).

11. The battery cell (22) according to claim 10, characterized in that, The outer edge of the isolation member (113) includes a first outer edge (113a) and a fifth outer edge (113e) located in the peripheral portion (100b), and also includes a third outer edge (113c) located in the central portion (100a). The first outer edge (113a), the third outer edge (113c), and the fifth outer edge (113e) all extend along the first direction; the first bottom edge (112a) and the first outer edge (113a) are separated by a sixth spacing along the second direction, the third bottom edge (112c) and the third outer edge (113c) are separated by an eighth spacing along the first direction, and the fifth bottom edge (112e) and the fifth outer edge (113e) are separated by a tenth spacing along the first direction, wherein the sixth spacing, the eighth spacing, and the tenth spacing are all equal.

12. The battery cell (22) according to claim 11, characterized in that, The outer edge of the isolation member (113) also includes a second outer edge (113b) and a fourth outer edge (113d) located at the center (100a), both of which extend along the first direction; The second bottom edge (112b) and the second outer edge (113b) are separated by a seventh spacing along the second direction, and the fourth bottom edge (112d) and the fourth outer edge (113d) are separated by a ninth spacing along the second direction, wherein the seventh spacing is equal to the ninth spacing.

13. The battery cell (22) according to claim 12, characterized in that, The seventh spacing is greater than or equal to the eighth spacing.

14. The battery cell (22) according to claim 5, characterized in that, When the electrode unit (100) is a stacked structure, the first electrode unit (110) and the second electrode unit (120) are stacked along a third direction, which is the width direction of the battery cell (22); The electrode unit (100) has two peripheral portions (100b) and a central portion (100a), the two peripheral portions (100b) are arranged opposite each other along a third direction, and the central portion (100a) is located between the two peripheral portions (100b).

15. The battery cell (22) according to claim 14, characterized in that, All the second electrode units (120) are located in the peripheral portion (100b), and all the first electrode units (110) are located in the central portion (100a).

16. The battery cell (22) according to claim 14, characterized in that, A portion of the second electrode unit (120) is located in the peripheral portion (100b), while another portion of the second electrode unit (120) and all of the first electrode unit (110) are alternately stacked in the central portion (100a) along the third direction.

17. The battery cell (22) according to claim 5, characterized in that, When the electrode unit (100) is a wound structure and includes an electrode assembly (101), the electrode assembly (101) has an inner ring region (101a) and an outer ring region (101b) surrounding the outer periphery of the inner ring region (101a). The inner ring region (101a) of the electrode assembly (101) is configured as the center portion (100a) of the electrode unit (100), and the outer ring region (101b) of the electrode assembly (101) is configured as the peripheral portion (100b) of the electrode unit (100). The electrode assembly (101) includes at least one first electrode unit (110) and at least one second electrode unit (120), with all second electrode units (120) located in the outer ring region (101b) and all first electrode units (110) located in the inner ring region (101a).

18. The battery cell (22) according to claim 5, characterized in that, When the electrode unit (100) is a wound structure and includes at least two electrode assemblies (101) stacked along a third direction, the third direction is the width direction of the battery cell (22); Each of the electrode components (101) has an inner ring region (101a) and an outer ring region (101b) surrounding the inner ring region (101a). The inner ring region (101a) of each of the electrode components (101) is configured as its own center (100a), and the outer ring region (101b) of each of the electrode components (101) is configured as its own periphery (100b). Each of the electrode assemblies (101) includes at least one first electrode unit (110) and at least one second electrode unit (120), all the second electrode units (120) of each of the electrode assemblies (101) are located at their center (100a), and all the first electrode units (110) of each of the electrode assemblies (101) are located at their periphery (100b).

19. The battery cell (22) according to claim 5, characterized in that, When the electrode unit (100) is a wound structure and includes at least two electrode assemblies (101) stacked along a third direction, the third direction is the width direction of the battery cell (22); Each of the electrode assemblies (101) located on the two outer sides of the third direction is configured as two peripheral portions (100b) of the electrode unit (100), and each of the electrode assemblies (101) located between the two peripheral portions (100b) is configured as the central portion (100a) of the electrode unit (100). Each of the electrode assemblies (101) has an inner ring region (101a) and an outer ring region (101b) surrounding the inner ring region (101a). In each of the electrode assemblies (101) in the peripheral portion (100b), any one of the electrode assemblies (101) includes at least one first electrode unit (110) and at least one second electrode unit (120), all of the second electrode units (120) are located in the outer ring region (101b), and all of the first electrode units (110) are located in the inner ring region (101a). In each of the electrode assemblies (101) in the central portion (100a), any one of the electrode assemblies (101) includes at least one first electrode unit (110), and both the outer ring region (101b) and the inner ring region (101a) are the first electrode units (110).

20. The battery cell (22) according to claim 3, characterized in that, The bottom protector (200) is also provided with an auxiliary hole (210), which penetrates the bottom protector (200) along the first direction.

21. The battery cell (22) according to claim 1, characterized in that, The battery cell (22) also includes a thin film (300) and a housing (23). The thin film (300) is wrapped around the outer periphery of the bottom protector (200) and the electrode unit (100). The bottom protector (200) and the electrode unit (100) are housed in the housing (23).

22. A battery device (20), characterized in that, Includes the battery cell (22) as described in any one of claims 1-21.

23. An electrical appliance, characterized in that, Includes the battery device (20) as described in claim 22.

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