Battery cell pole piece, battery cell, battery, battery pack and electric equipment

Abstract

The utility model discloses a battery cell pole piece, a battery cell, a battery, a battery pack and electric equipment, the battery cell pole piece comprises: a current collector, the current collector comprises a coating area, at least one surface of the coating area is covered with an active material coating; wherein in the active material coating layer on at least one surface of the coating area: a plurality of wire grooves extending in a plurality of different directions are formed; or a plurality of micropore areas and a plurality of wire slots are formed, and a plurality of micropores are formed in each micropore area; or a plurality of wire ducts which are not communicated with each other and have lengths smaller than a preset length are formed. According to the scheme, low-tortuosity channels can be constructed in the thickness direction and the surface direction of the battery cell pole piece at the same time, the infiltration speed and the diffusion speed of an electrolyte are increased, the diffusion impedance of ions is reduced, and the power and the dynamic performance of a battery where the battery cell pole piece is located are improved; and meanwhile, the loss of the active material in the active material coating can be reduced, so that the waste of the capacity and the cost of the battery cell can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly to an electrode sheet of an electric cell, an electric cell, a battery, a battery pack, and an electrical device using the same. Background Art

[0002] With the continuous development of technology, users have put forward higher requirements for the energy density and charging speed of batteries. Taking lithium-ion batteries as an example, in order to meet the above requirements, the electrode sheets of conventional lithium-ion batteries are developed towards larger sizes and higher areal densities.

[0003] However, the large-size and high-areal-density electrode sheets of electric cells are likely to cause poor electrolyte infiltration and uneven infiltration, and will also result in a long diffusion distance of the electrolyte. There is a risk of lithium deposition in the middle position of the electrode sheet of the electric cell during charge and discharge cycles. In addition, the high tortuosity of the electrode sheet of the electric cell will also deteriorate the diffusion ability of the electrolyte, thereby resulting in the inability to fully exert the power and kinetic performance of the battery where the electrode sheet of the electric cell is located. Summary of the Utility Model

[0004] A series of simplified concepts are introduced in the Summary of the Utility Model section, which will be further elaborated in detail in the Detailed Description section. The Summary of the Utility Model section of the present utility model does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0005] In view of the existing problems, on the one hand, the present utility model provides an electrode sheet of an electric cell, comprising:

[0006] A current collector, comprising a coating area, and an active material coating is covered on at least one surface of the coating area;

[0007] Wherein, a plurality of wire grooves extending in a plurality of different directions are formed in the active material coating on at least one surface of the coating area, and the plurality of wire grooves divide the surface of the active material coating into a plurality of partitions; or,

[0008] A plurality of micro-porous areas and a plurality of wire grooves are formed in the active material coating on at least one surface of the coating area, and a plurality of micropores are formed in each of the micro-porous areas; or,

[0009] A plurality of wire grooves with lengths less than a preset length and not communicating with each other are formed in the active material coating on at least one surface of the coating area.

[0010] Exemplarily, the bottom width of the wire groove is less than or equal to the top width of the wire groove, and the bottom width of the micropore is less than or equal to the top width of the micropore.

[0011] Exemplarily, the cross-section of the wire groove and the micro-hole in the depth direction is rectangular, trapezoidal or triangular.

[0012] Exemplarily, the width range of the wire groove is 1 μm to 200 μm, and the pore diameter range of the micro-hole is 1 μm to 200 μm.

[0013] Exemplarily, the depth range of both the micro-hole and the wire groove is 5 μm to 200 μm.

[0014] Exemplarily, when multiple wire grooves extending in multiple different directions or multiple wire grooves with lengths less than the preset length and not communicating with each other are formed in the active material coating on at least one surface of the coating area, the spacing range between adjacent wire grooves extending in the same direction is 30 μm to 40000 μm.

[0015] Exemplarily, when multiple micro-hole areas and multiple wire grooves are formed in the active material coating on at least one surface of the coating area, the spacing range between adjacent micro-holes and wire grooves is 30 μm to 40000 μm, and the spacing range between adjacent wire grooves extending in the same direction is 30 μm to 40000 μm.

[0016] Exemplarily, when multiple wire grooves extending in multiple different directions are formed in the active material coating on at least one surface of the coating area, the multiple wire grooves divide the surface of the active material coating into multiple rectangular partitions along the length direction and the width direction of the cell pole piece, or the multiple wire grooves divide the surface of the active material coating into multiple hexagonal partitions.

[0017] Exemplarily, when multiple micro-hole areas and multiple wire grooves are formed in the active material coating on at least one surface of the coating area, the multiple wire grooves and the multiple micro-hole areas are arranged crosswise along the length direction or the width direction of the cell pole piece;

[0018] Among them, when the multiple wire grooves and the multiple micro-hole areas are arranged crosswise along the length direction of the cell pole piece, the multiple wire grooves extend along the width direction of the cell pole piece, and the multiple micro-holes in each micro-hole area are arranged along the width direction of the cell pole piece;

[0019] When the multiple wire grooves and the multiple micro-hole areas are arranged crosswise along the width direction of the cell pole piece, the multiple wire grooves extend along the length direction of the cell pole piece, and the multiple micro-holes in each micro-hole area are arranged along the length direction of the cell pole piece.

[0020] Exemplarily, when a plurality of wire grooves with lengths less than a preset length and not communicating with each other are formed in the active material coating on at least one surface of the coating area, the plurality of wire grooves extend along the width direction or the length direction of the electrode tab of the battery cell, and multiple columns of the wire grooves are arranged along the length direction and / or the width direction of the electrode tab of the battery cell, and each column of the multiple columns of wire grooves includes at least two of the wire grooves.

[0021] Exemplarily, when the wire grooves are formed in the active material coatings on both surfaces of the coating area, the wire grooves in the active material coatings on both surfaces of the coating area are correspondingly arranged; or

[0022] When the micropores are formed in the active material coatings on both surfaces of the coating area, the micropores in the active material coatings on both surfaces of the coating area are correspondingly arranged.

[0023] Exemplarily, the electrode tab of the battery cell is a positive electrode tab, the current collector is an aluminum foil material, and the active material coating is a positive electrode active material coating; or,

[0024] The electrode tab of the battery cell is a negative electrode tab, the current collector is a copper foil material, and the active material coating is a negative electrode active material coating.

[0025] On the other hand, the present application provides a battery cell, including a positive electrode tab, a negative electrode tab, and a separator layer, the separator layer is disposed between the positive electrode tab and the negative electrode tab, wherein at least one of the positive electrode tab and the negative electrode tab includes the above-mentioned electrode tab of the battery cell.

[0026] Exemplarily, the positive electrode tab, the negative electrode tab, and the separator layer are wound to form a wound battery cell; or,

[0027] The positive electrode tab, the negative electrode tab, and the separator layer are stacked to form a stacked battery cell.

[0028] On the other hand, the present application provides a battery, including a housing, a cover plate, and the above-mentioned battery cell, the housing and the cover plate enclose an accommodation space, and the battery cell is disposed in the accommodation space.

[0029] On the other hand, the present application provides a battery pack, including the above-mentioned battery.

[0030] On the other hand, the present application provides an electrical device, including the above-mentioned battery, or including the above-mentioned battery pack.

[0031] According to the electrode sheet of the battery cell, the battery cell, the battery, the battery pack and the electrical equipment of the present utility model, in the active material coating on at least one surface of the coating area of the current collector of the electrode sheet of the battery cell, wire grooves extending in a plurality of different directions are formed, or a plurality of microporous regions and a plurality of wire grooves are formed, or a plurality of wire grooves with lengths less than a preset length and not communicating with each other are formed, which can simultaneously construct low tortuosity channels in the thickness direction and the surface direction of the electrode sheet of the battery cell, effectively improving the infiltration speed and diffusion speed of the electrolyte, reducing the diffusion impedance of ions, and improving the power and kinetic performance of the battery where the electrode sheet of the battery cell is located; at the same time, it can also reduce the loss of the active material in the active material coating, and further reduce the waste of the battery cell capacity and cost. Description of the Drawings

[0032] By describing the embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features and advantages of the present application will become more obvious. The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation to the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0033] Figure 1 The top view shows that a plurality of wire grooves extending in a plurality of directions are formed in the active material coating of a specific embodiment of the present application;

[0034] Figure 2 The top view shows that a plurality of wire grooves extending in a plurality of directions are formed in the active material coating of another specific embodiment of the present application;

[0035] Figure 3 The top view shows that a plurality of microporous regions and a plurality of wire grooves are formed in the active material coating of a specific embodiment of the present application;

[0036] Figure 4 The top view shows that a plurality of microporous regions and a plurality of wire grooves are formed in the active material coating of another specific embodiment of the present application;

[0037] Figure 5 The top view shows that a plurality of wire grooves with lengths less than a preset length and not communicating with each other are formed in the active material coating of a specific embodiment of the present application;

[0038] Figure 6 The cross-sectional view shows that wire grooves or wire grooves and micropores are formed in the active material coating on one surface of the coating area of a specific embodiment of the present application;

[0039] Figure 7A cross-sectional view is shown of a current collector, an active material coating formed on two surfaces of a coating area in a specific embodiment of the present application, with a wire groove or both a wire groove and micropores formed in the active material coating.

[0040] Reference numerals:

[0041] 110 - Current collector; 120 - Active material coating; 130 - Wire groove; 140 - Micropore. Specific embodiments

[0042] In the following description, numerous specific details are given to provide a more thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application may be practiced without one or more of these details. In other instances, well-known features of the art are not described in order to avoid obscuring the present application.

[0043] It should be understood that the present application can be implemented in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.

[0044] It should be understood that although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or section from another. Thus, a first element, component, region, layer, or section discussed below may be termed a second element, component, region, layer, or section without departing from the teachings of the present application.

[0045] Spatial relationship terms such as "under", "below", "beneath", "underneath", "above", "over", etc. may be used herein for convenience in describing the relationship of one element or feature shown in the figures to another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial relationship terms are intended to encompass different orientations of the device in use and operation.

[0046] The purpose of the terms used herein is only to describe specific embodiments and is not a limitation of the present application. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, identify the presence of the stated features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups. As used herein, the term "and / or" includes any and all combinations of the related listed items.

[0047] In the related art, the electrode sheet of an electric core includes a current collector and an active material coating located on the surface of the current collector. Pores for electrolyte diffusion are formed in the active material coating. In order to improve the problems that large-size and high areal density electrode sheets of electric cores are prone to cause full infiltration of the electrolyte, poor consistency of infiltration, long diffusion distance of the electrolyte, and the high tortuosity of the electrode sheet of the electric core makes the diffusion ability of the electrolyte poor, generally, a microporous structure or a groove structure is separately formed on the active material coating to construct a low-tortuosity channel to accelerate the infiltration speed and diffusion speed of the electrolyte.

[0048] However, the separate microporous structure can only reduce the tortuosity in the thickness direction of the electrode sheet of the electric core, that is, it can only accelerate the diffusion speed of the electrolyte in the thickness direction of the electrode sheet of the electric core, and cannot accelerate the diffusion speed of the electrolyte in the surface direction of the electrode sheet of the electric core; while the separate groove structure can accelerate the diffusion speed of the electrolyte in both the thickness direction and the surface direction of the electrode sheet of the electric core, but the spacing of the separate groove structure is small, which causes great damage to the active material in the active material coating and will result in waste of the electric core capacity and cost.

[0049] In view of the existence of the above technical problems, the present utility model provides an electrode sheet of an electric core, an electric core, a battery, a battery pack and an electrical device using the same to at least partially solve the above problems.

[0050] Refer to Figures 1 to 7 An exemplary description is given of the electrode sheet of an electric core according to a specific embodiment of the present application. As Figures 1 to 7 shown, the electrode sheet of the electric core of the present application includes a current collector 110 and an active material coating 120, wherein: the current collector 110 includes a coating area, and at least one surface of the coating area is covered with the active material coating 120. Among them, the current collector 110 further includes a tab, and the part of the current collector 110 not covered by the active material coating 120 is the tab.

[0051] In one example, as Figure 1 and Figure 2As shown, a plurality of wire grooves 130 extending in a plurality of different directions are formed in the active material coating 120 on at least one surface of the coating area. The plurality of wire grooves 130 divide the surface of the active material coating 120 into a plurality of partitions. Exemplarily, compared with the wire grooves extending in the same direction, the spacing of the wire grooves 130 extending in a plurality of different directions in the present application can be set larger, so that when ensuring the same improvement in the electrolyte infiltration speed and diffusion speed, the loss of the active material of the active material coating 120 can be effectively reduced, and thus the waste of the cell capacity and cost can be reduced. Exemplarily, the plurality of wire grooves 130 partition the surface of the active material coating 120, which can effectively improve the electrolyte infiltration speed and diffusion speed.

[0052] In another example, as Figure 3 and Figure 4 shown, a plurality of microporous regions and a plurality of wire grooves 130 are formed in the active material coating 120 on at least one surface of the coating area, and a plurality of micropores 140 are formed in each microporous region. Exemplarily, compared with simply forming wire grooves in the active material coating 120, the present application simultaneously forms wire grooves 130 and micropores 140 in the active material coating 120, which can effectively reduce the loss of the active material of the active material coating 120 while ensuring the improvement of the electrolyte infiltration speed and diffusion speed in the thickness direction and surface direction of the cell electrode, and thus can reduce the waste of the cell capacity and cost. Exemplarily, the microporous region is a region preset in the active material coating 120 for forming micropores 140 therein. The plurality of microporous regions are arranged at intervals, and wire grooves 130 are arranged between adjacent microporous regions.

[0053] In another example, as Figure 5 shown, a plurality of wire grooves 130 with lengths less than a preset length and not communicating with each other are formed in the active material coating 120 on at least one surface of the coating area. Exemplarily, compared with simply forming long wire grooves with longer lengths in the active material coating 120, the lengths of the wire grooves 130 in the present application are less than the preset length, so that the loss of the active material of the active material coating 120 can be effectively reduced, and thus the waste of the cell capacity and cost can be reduced. Exemplarily, the preset length should be reasonably set according to the actual situation, and the present application does not limit this.

[0054] In one example, as Figure 6 shown, the above-mentioned wire grooves 130 and / or micropores 140 may be formed only in the active material coating 120 on one surface of the coating area; or, as Figure 7 shown, the above-mentioned wire grooves 130 and / or micropores 140 may also be formed in the active material coatings 120 on both surfaces of the coating area. The present application does not limit this.

[0055] In one example, pores for electrolyte flow are formed in the active material coating 120, and ions in the electrolyte move in the pores to achieve current flow. However, the pores are irregularly distributed in the active material coating 120, and the tortuosity of the electrolyte flow in the pores is relatively high. The micro-pores 140 in the present application are equivalent to constructing a low-tortuosity channel for electrolyte flow in the thickness direction of the cell electrode tab; the wire grooves 130 in the present application can be regarded as structures obtained by extending the micro-pores 140 in a certain direction. The wire grooves 130 are equivalent to constructing a low-tortuosity channel for electrolyte flow in both the thickness direction and the surface direction of the cell electrode tab, thereby effectively reducing the diffusion barrier of ions and accelerating the infiltration speed and diffusion speed of the electrolyte. At the same time, the wire grooves and micro-pores can also increase the surface area of the active material coating 120, and further increase the contact area of the ions in the electrolyte with the active material coating 120, so that the reaction can be more sufficient.

[0056] Therefore, in the active material coating on at least one surface of the coating area of the current collector of the cell electrode tab of the present application, wire grooves extending in multiple different directions are formed, or multiple micro-pore regions and multiple wire grooves are formed, or multiple wire grooves with lengths less than a preset length and not communicating with each other are formed, which can simultaneously construct low-tortuosity channels in the thickness direction and the surface direction of the cell electrode tab, effectively improving the infiltration speed and diffusion speed of the electrolyte, reducing the diffusion impedance of ions, and improving the power and dynamic performance of the battery where the cell electrode tab is located; at the same time, it can also reduce the loss of the active material in the active material coating, and further reduce the waste of the cell capacity and cost.

[0057] In one example, the cell electrode tab can be a positive electrode tab or a negative electrode tab. When the cell electrode tab is a positive electrode tab, the current collector 110 is made of aluminum foil, and the active material coating 120 is a positive electrode active material coating; when the cell electrode tab is a negative electrode tab, the current collector 110 is made of copper foil, and the active material coating 120 is a negative electrode active material coating. Exemplarily, the current collector 110 can also be made of other suitable materials, and the present application does not limit this.

[0058] Specifically, the material of the positive electrode active material coating can be lithium-containing phosphate with an olivine structure, lithium transition metal oxide, and their respective modified compounds, but is not limited to the above examples. The lithium-containing phosphate with an olivine structure can include, but is not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon, but is not limited to the above examples. The material of the negative electrode active material coating can be at least one of artificial graphite, natural graphite, mesocarbon microbeads, hard carbon, soft carbon, silicon, silicon oxide, silicon carbide, and silicon alloy, but is not limited to the above examples. Exemplarily, the porosity range of the positive electrode active material coating is 20% to 45%, and the porosity range of the negative electrode active material coating is 25% to 50%.

[0059] In one example, as Figure 7 shown, when the wire grooves 130 are formed in the active material coatings 120 on both surfaces of the coating area, the wire grooves 130 in the active material coatings 120 on both surfaces of the coating area are correspondingly arranged; or, when the micropores 140 are formed in the active material coatings 120 on both surfaces of the coating area, the micropores 140 in the active material coatings 120 on both surfaces of the coating area are correspondingly arranged.

[0060] In one example, the wire grooves 130 and / or the micropores 140 penetrate through the active material coating 120. In other embodiments, the wire grooves 130 and / or the micropores 140 can further penetrate through the current collector 110. At this time, channels for the electrolyte to flow are also formed in the current collector 110 that originally did not participate in the electrolyte flow, which can effectively improve the infiltration speed and diffusion speed of the electrolyte between adjacent cell electrodes.

[0061] In one example, the bottom width of the wire groove 130 is less than or equal to the top width of the wire groove 130, and the bottom width of the micropore 140 is less than or equal to the top width of the micropore 140. More specifically, the cross-section of the wire groove 130 and the micropore 140 in the depth direction can be rectangular, trapezoidal, or triangular. Exemplarily, taking the wire groove 130 and the micropore 140 as frustum-shaped as an example, the bottom diameter of the wire groove 130 is less than the top diameter of the wire groove 130, and the bottom diameter of the micropore 140 is less than the top diameter of the micropore 140.

[0062] In one example, the width range of the wire groove 130 is 1 μm to 200 μm, and the pore diameter range of the micropore 140 is 1 μm to 200 μm.

[0063] In one example, the depth range of both the wire groove 130 and the micropore 140 is 5 μm to 200 μm.

[0064] In one example, the wire grooves 130 and the micro holes 140 are formed by means such as laser etching for hole formation, mechanical die processing, solvent pore-forming agent, or coating active material magnetic processing, etc., but are not limited to the above examples.

[0065] In one example, as Figure 1 and Figure 2 shown, when a plurality of wire grooves 130 extending in a plurality of different directions are formed in the active material coating 120 on at least one surface of the coating area, the plurality of wire grooves 130 divide the surface of the active material coating 120 into a plurality of rectangular partitions along the length direction and the width direction of the battery cell pole piece respectively, or the plurality of wire grooves 130 divide the surface of the active material coating 120 into a plurality of hexagonal partitions. Exemplarily, when the plurality of wire grooves 130 extend along the length direction and the width direction of the battery cell pole piece respectively, the length of the wire groove 130 is the shortest, the damage to the active material of the active material coating 120 by the wire groove 130 is the smallest, and the path of the electrolyte flow is shorter, and the infiltration speed and diffusion speed of the electrolyte are faster. In other embodiments, the plurality of wire grooves 130 may also divide the surface of the active material coating 120 into a plurality of partitions along a plurality of other directions, and the shape of the partitions may also be any other suitable shape, for example, the plurality of wire grooves 130 may divide the surface of the active material coating 120 into a regular pentagon or other regular polygon shapes, and the present application does not limit this.

[0066] In one example, when a plurality of micro hole areas and a plurality of wire grooves 130 are formed in the active material coating 120 on at least one surface of the coating area, the plurality of wire grooves 130 and the plurality of micro hole areas are arranged in a crosswise manner along the length direction or the width direction of the battery cell pole piece; wherein, as Figure 3 shown, when the plurality of wire grooves 130 and the plurality of micro hole areas are arranged in a crosswise manner along the length direction of the battery cell pole piece, the plurality of wire grooves 130 extend along the width direction of the battery cell pole piece, and the plurality of micro holes 140 in each micro hole area are arranged along the width direction of the battery cell pole piece; as Figure 4 shown, when the plurality of wire grooves 130 and the plurality of micro hole areas are arranged in a crosswise manner along the width direction of the battery cell pole piece, the plurality of wire grooves 130 extend along the length direction of the battery cell pole piece, and the plurality of micro holes 140 in each micro hole area are arranged along the length direction of the battery cell pole piece. In other embodiments, the plurality of wire grooves 130 and the plurality of micro hole areas may also be arranged in a crosswise manner along other directions, and the plurality of wire grooves 130 and the plurality of micro holes 140 in each micro hole area may also extend along other directions, and the present application does not limit this.

[0067] In one example, as Figure 5As shown, when a plurality of wire grooves 130 with lengths less than a preset length and not connected to each other are formed in the active material coating 120 on at least one surface of the coating area, the plurality of wire grooves 130 extend along the width direction or the length direction of the cell pole piece, and multiple columns of wire grooves 130 are arranged in the length direction and / or the width direction of the cell pole piece. Each column of the multiple columns of wire grooves 130 includes at least two wire grooves 130, and adjacent two wire grooves are spaced apart from each other. In other embodiments, the plurality of wire grooves 130 may also extend in other directions (i.e., other directions other than the length direction and the width direction), and multiple columns of wire grooves 130 may also be arranged in other directions of the cell pole piece. The present application does not limit this.

[0068] In one example, when a plurality of wire grooves 130 extending in a plurality of different directions are formed in the active material coating 120 on at least one surface of the coating area, or when a plurality of wire grooves 130 with lengths less than a preset length and not connected to each other are formed, the spacing range between adjacent wire grooves 130 extending in the same direction is 30 μm to 40000 μm. For example, the spacing may be 30 μm, 100 μm, 2000 μm, 4000 μm, etc.

[0069] In one example, when a plurality of micro-porous regions and a plurality of wire grooves 130 are formed in the active material coating 120 on at least one surface of the coating area, the spacing range between adjacent micropores 140 and wire grooves 130 is 30 μm to 40000 μm, and the spacing range between adjacent wire grooves 130 extending in the same direction is 30 μm to 40000 μm. For example, the spacing may be 30 μm, 100 μm, 2000 μm, 4000 μm, etc.

[0070] So far, the introduction of the structure of the cell pole piece of the present utility model has been completed. For a complete cell pole piece, there may be other component structures, which will not be elaborated one by one here.

[0071] In summary, for the cell pole piece of the present utility model, wire grooves extending in a plurality of different directions are formed in the active material coating on at least one surface of the coating area of the current collector of the cell pole piece, or a plurality of micro-porous regions and a plurality of wire grooves are formed, or a plurality of wire grooves with lengths less than a preset length and not connected to each other are formed, which can simultaneously construct low tortuosity channels in the thickness direction and the surface direction of the cell pole piece, effectively improving the infiltration speed and diffusion speed of the electrolyte, reducing the diffusion impedance of ions, and improving the power and kinetic performance of the battery where the cell pole piece is located; at the same time, it can also reduce the loss of the active material in the active material coating, and further reduce the waste of the cell capacity and cost.

[0072] An embodiment of the present application further provides an electric core, which includes a positive electrode tab, a negative electrode tab, and a separator. At least one of the positive electrode tab and the negative electrode tab includes the above-mentioned electric core tab. The separator is disposed between the positive electrode tab and the negative electrode tab to prevent the positive electrode tab and the negative electrode tab from directly contacting and causing a short circuit. Exemplarily, pores for ion movement are formed in the separator, the active material coating of the positive electrode tab, and the active material coating of the negative electrode tab.

[0073] In one example, the electrolyte in the electric core includes an electrolyte salt and a solvent. The electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro(bis(oxalato))phosphate, and lithium tetrafluoro(oxalato)phosphate, but is not limited to the above examples.

[0074] In one example, the positive electrode tab, the negative electrode tab, and the separator are wound to form a wound electric core; alternatively, the positive electrode tab, the negative electrode tab, and the separator are stacked to form a stacked electric core.

[0075] In one example, the electric core of the present application including the above-mentioned electric core tab can be prepared through the following steps: by formulating the active material materials, different active material materials are respectively coated on the aluminum foil material and the copper foil material to form a positive electrode tab coil and a negative electrode tab coil, and after baking and rolling, the positive electrode tab coil and the negative electrode tab coil have a certain compaction density; then, taking the laser engraving process as an example, along with the unwinding and rewinding speeds of the positive electrode tab coil and the negative electrode tab coil, the micro-holes and wire grooves are synchronously processed by controlling the energy, pulse width, dust removal air speed, and processing frequency of the laser to form the electric core tab described above. During the processing, a dust removal fan is used to remove the generated dust; then, the positive electrode tab coil and the negative electrode tab coil after the micro-hole and wire groove processing are subjected to slitting processing; finally, the slit positive electrode tab coil and negative electrode tab coil are made into an electric core through a stacking process or a winding process, and hot pressing is performed at 90 °C for forming.

[0076] In one example, the shape of the electric core can specifically be a short electric core or a long electric core with a relatively thin thickness, or a rectangular block-shaped electric core with a slightly thicker thickness. The rectangular block-shaped electric core can specifically be, for example but not limited to, a square aluminum shell electric core, etc. The shape of the electric core can also be a cylindrical electric core.

[0077] Thus, the introduction of the structure of the electric core of the present utility model is completed. For a complete electric core, there may be other constituent structures, which will not be elaborated one by one here.

[0078] In summary, the battery cell of the present utility model includes the above-mentioned battery cell electrode plate. In the active material coating on at least one surface of the current collector coating area of the battery cell electrode plate, wire grooves extending in multiple different directions are formed, or multiple microporous areas and multiple wire grooves are formed, or multiple wire grooves with lengths less than a preset length and not communicating with each other are formed. It can simultaneously construct low tortuosity channels in the thickness direction and the surface direction of the battery cell electrode plate, effectively improving the infiltration speed and diffusion speed of the electrolyte, reducing the diffusion impedance of ions, and improving the power and dynamic performance of the battery where the battery cell electrode plate is located. At the same time, it can also reduce the loss of the active material in the active material coating, and thus can reduce the waste of the battery cell capacity and cost.

[0079] The embodiment of the present application also provides a battery, which includes a housing, a cover plate, and the above-mentioned battery cell. The housing and the cover plate enclose an accommodation space, and the battery cell is arranged in the accommodation space.

[0080] In one example, multiple layers of battery cells are arranged in the battery, and an exhaust channel is arranged between any adjacent layers of battery cells. Exemplarily, the exhaust channel can be used to prevent the gas inside the battery from accumulating between the battery cells, thereby avoiding safety problems such as the battery swelling, bursting, or even exploding. Exemplarily, the exhaust channel is arranged in the cross beam or longitudinal beam between adjacent layers of battery cells.

[0081] In one example, a cold plate is further arranged at the top and / or bottom of the battery cell. The cold plate is bonded to the battery cell through a thermally conductive structural adhesive to control the temperature of the battery cell.

[0082] So far, the introduction of the structure of the battery of the present utility model has been completed. For a complete battery, there may be other component structures, which will not be elaborated one by one here.

[0083] The embodiment of the present application also provides a battery pack, which includes the above-mentioned battery. Exemplarily, for a complete battery pack, there may be other component structures, which will not be elaborated one by one here.

[0084] The embodiment of the present application also provides an electrical device, which includes the above-mentioned battery, or includes the above-mentioned battery pack. The electrical device includes electric vehicles, hybrid vehicles, and industrial equipment, etc., all within the protection scope of the present utility model.

[0085] Although the exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely exemplary and are not intended to limit the scope of the present application. Those of ordinary skill in the art can make various changes and modifications therein without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as claimed in the appended claims.

[0086] In the specification provided herein, a large number of specific details are set forth. However, it will be understood that embodiments of the present application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail so as not to obscure the understanding of this description.

[0087] Similarly, it should be understood that, in order to streamline the present application and assist in understanding one or more of the various utility model aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together in a single embodiment, figure, or description thereof. However, the method of the present application should not be construed as reflecting an intention that the claimed present application requires more features than are expressly recited in each claim. Rather, as reflected by the corresponding claims, the inventive point lies in that the corresponding technical problem can be solved by features less than all the features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, where each claim itself serves as a separate embodiment of the present application.

[0088] Those skilled in the art will understand that, except where features are mutually exclusive, any combination can be used for all the features disclosed in this specification (including the accompanying claims, abstract and drawings) and for all the processes or units of any method or apparatus so disclosed. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract and drawings) can be replaced by alternative features providing the same, equivalent or similar purpose.

[0089] In addition, those skilled in the art will be able to understand that, although some of the embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0090] It should be noted that the above embodiments illustrate rather than limit the present application, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims.

Claims

1. A battery cell electrode, characterized in that: include: A current collector including a coating region, at least one surface of the coating region being covered with an active material coating; wherein a plurality of linear grooves extending in a plurality of different directions are formed in the active material coating on at least one surface of the coating area, and the plurality of linear grooves divide the surface of the active material coating into a plurality of partitions; or, A plurality of microporous regions and a plurality of linear grooves are formed in the active material coating on at least one surface of the coating region, and a plurality of micropores are formed in each of the microporous regions; or A plurality of linear grooves having a length less than a preset length and not connected to each other are formed in the active material coating on at least one surface of the coating area.

2. The battery cell electrode according to claim 1, characterized in that: The bottom width of the wire groove is smaller than or equal to the top width of the wire groove, and the bottom width of the micro hole is smaller than or equal to the top width of the micro hole.

3. The battery cell electrode according to claim 2, characterized in that: The cross-sections of the wire groove and the microhole along the depth direction are rectangular, trapezoidal or triangular.

4. The battery cell electrode according to claim 1, characterized in that: The width of the wire groove ranges from 1 μm to 200 μm, and the pore size of the micropore ranges from 1 μm to 200 μm.

5. The battery cell electrode according to claim 1, characterized in that: The depths of the microholes and the wire grooves are both in the range of 5 μm to 200 μm.

6. The battery cell electrode according to any one of claims 1 to 5, characterized in that: When a plurality of the linear grooves extending in a plurality of different directions or a plurality of the linear grooves having a length less than the preset length and not interconnected are formed in the active material coating on at least one surface of the coating area, the spacing between adjacent linear grooves extending in the same direction ranges from 30 μm to 40,000 μm.

7. The battery cell electrode according to any one of claims 1 to 5, characterized in that: When a plurality of the micropore areas and a plurality of the linear grooves are formed in the active material coating on at least one surface of the coating area, the spacing between adjacent micropores and the linear grooves ranges from 30 μm to 40,000 μm, and the spacing between adjacent linear grooves extending in the same direction ranges from 30 μm to 40,000 μm.

8. The battery cell electrode according to any one of claims 1 to 5, characterized in that: When a plurality of the wire grooves extending along a plurality of different directions are formed in the active material coating on at least one surface of the coating area, the plurality of the wire grooves divide the surface of the active material coating into a plurality of rectangular partitions along the length direction and the width direction of the battery cell electrode respectively, or the plurality of the wire grooves divide the surface of the active material coating into a plurality of hexagonal partitions.

9. The battery cell electrode according to any one of claims 1 to 5, characterized in that: When a plurality of the microporous regions and a plurality of the wire grooves are formed in the active material coating on at least one surface of the coating area, the plurality of the wire grooves and the plurality of the microporous regions are cross-arranged along the length direction or the width direction of the battery cell electrode sheet; Wherein, when the plurality of wire grooves and the plurality of microporous areas are cross-arranged along the length direction of the battery cell electrode sheet, the plurality of wire grooves extend along the width direction of the battery cell electrode sheet, and the plurality of micropores in each microporous area are arranged along the width direction of the battery cell electrode sheet; When the plurality of wire grooves and the plurality of microporous areas are cross-arranged along the width direction of the battery cell pole piece, the plurality of wire grooves extend along the length direction of the battery cell pole piece, and the plurality of micropores in each microporous area are arranged along the length direction of the battery cell pole piece.

10. The battery cell electrode according to any one of claims 1 to 5, characterized in that: When a plurality of wire grooves having a length less than a preset length and not interconnected are formed in the active material coating on at least one surface of the coating area, the plurality of wire grooves extend along the width direction or the length direction of the battery cell pole piece, and a plurality of columns of the wire grooves are arranged along the length direction and / or the width direction of the battery cell pole piece, and each of the plurality of columns of the wire grooves includes at least two wire grooves.

11. The battery cell electrode according to any one of claims 1 to 5, characterized in that: When the wire grooves are formed in the active material coatings on both surfaces of the coating area, the wire grooves in the active material coatings on both surfaces of the coating area are arranged correspondingly; or When the micropores are formed in the active material coatings on both surfaces of the coating region, the micropores in the active material coatings on both surfaces of the coating region are arranged correspondingly.

12. The battery cell electrode according to claim 1, characterized in that: The battery core electrode is a positive electrode, the current collector is an aluminum foil, and the active material coating is a positive electrode active material coating; or, The battery cell pole piece is a negative pole piece, the current collector is a copper foil material, and the active material coating is a negative electrode active material coating.

13. A battery cell, characterized in that: It comprises a positive electrode sheet, a negative electrode sheet and an isolation layer, wherein the isolation layer is arranged between the positive electrode sheet and the negative electrode sheet, wherein at least one of the positive electrode sheet and the negative electrode sheet comprises the battery cell sheet according to any one of claims 1-12.

14. The battery cell according to claim 13, characterized in that: The positive electrode sheet, the negative electrode sheet and the isolation layer are wound to form a wound battery cell; or, The positive electrode sheet, the negative electrode sheet and the isolation layer stack are arranged to form a stacked battery cell.

15. A battery, characterized in that: The invention comprises a shell, a cover plate and the battery cell according to any one of claims 13 to 14, wherein the shell and the cover plate enclose a containing space, and the battery cell is arranged in the containing space.

16. A battery pack, characterized in that: Comprising the battery of claim 15.

17. An electrical equipment, characterized in that: Includes the battery as claimed in claim 15, or includes the battery pack as claimed in claim 16.

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