Battery cells, batteries, and power consumption devices

Abstract

The present invention provides a battery cell (30), a battery (40), and a power consumption device. The battery cell (30) is an electrode assembly (10) including a first polarity sheet (11), a second polarity sheet (12), and an isolating member (13), the first polarity sheet (11) and the second polarity sheet (12) having opposite polarities, the isolating member (13) being located between the first polarity sheet (11) and the second polarity sheet (12), the first polarity sheet (11), the second polarity sheet (12), and the isolating member (13) being wound along a winding direction to form a wound structure (100), the first polarity sheet (11) including a plurality of first tabs (11B) bent at an end of the wound structure (100) to form a first tab stack structure (111), and the second polarity sheet (11) (12) includes an electrode assembly (10) including a plurality of second tabs (12B) bent at an end of the wound structure (100) to form a second tab stack structure (121), a first conductive member (21) welded to the first tab stack structure (111), and a second conductive member (22) welded to the second tab stack structure (121), and in a first direction (d1) parallel to the extension direction of the winding axis of the wound structure (100), at least one of the bending positions (11f) of the plurality of first tabs (11B) and the bending positions (12f) of the plurality of second tabs (12B) has a gap between it and the isolation member (13) in the first direction (d1).

Description

[Technical Field]

[0001] Cross-reference of related applications This application claims priority to the Chinese patent application No. 202310955457.7, filed on 1 August 2023, and all disclosures of said Chinese patent application are incorporated into this application by reference.

[0002] This disclosure relates to the battery technology field, and more particularly to battery cells, batteries, and power consumption devices. [Background technology]

[0003] Rechargeable batteries, especially lithium-ion batteries, have advantages such as high voltage, high energy density, long cycle life, environmental friendliness and low pollution, a wide operating temperature range, and low self-discharge. They are widely used in the powertrains of portable electronic devices and large new energy electric vehicles, and are of great significance in solving humanity's environmental pollution and energy crises. As lithium-ion batteries are widely applied, safety in battery use is a matter of great concern to users. [Overview of the Initiative]

[0004] One aspect of the present disclosure provides an electrode assembly comprising a first polar sheet, a second polar sheet, and an isolation member, wherein the polarities of the first polar sheet and the second polar sheet are opposite, the isolation member is located between the first polar sheet and the second polar sheet, the first polar sheet, the second polar sheet, and the isolation member are wound along a winding direction to form a wound structure, the first polar sheet includes a plurality of first tabs bent at the end of the wound structure to form a first tab stacked structure, and the second polar sheet includes a plurality of second tabs bent at the end of the wound structure to form a second tab stacked structure; and a first conductive member welded to the first tab stacked structure and a second conductive member welded to the second tab stacked structure, wherein in a first direction parallel to the extension direction of the winding axis of the wound structure, at least one of the bending positions of the plurality of first tabs and the bending positions of the plurality of second tabs has a gap between it and the isolation member in the first direction.

[0005] Multiple first tabs and multiple second tabs are bent at the ends of the wound structure to form a first tab laminated structure and a second tab laminated structure, and at least one of the bending positions of the multiple first tabs and the multiple second tabs has a gap with the isolation member in the first direction, thereby reducing the risk of the isolation member becoming hot due to the heat released from the tabs being conducted to the isolation member during the welding process between the tab laminated structure and the conductive member, thereby improving product yield and safety of use.

[0006] In some embodiments, the minimum distance of the gap between the bending positions of the plurality of first tabs and the isolation member in the first direction is defined as the first minimum distance L1, the minimum distance of the gap between the bending positions of the plurality of second tabs and the isolation member in the first direction is defined as the second minimum distance L2, the melting point of the material of the plurality of first tabs is lower than the melting point of the material of the plurality of second tabs, and the first minimum distance L1 is less than or equal to the second minimum distance L2.

[0007] In the case of a battery cell embodiment in which the melting point of the first tab material is lower than that of the second tab material, the second tab material with the higher melting point requires a greater amount of welding heat to form a weld pool. Correspondingly, the amount of heat generated during welding of the second tab stacked structure is higher, and by further increasing the second minimum distance L2, it is possible to reduce the risk of the isolation member portion corresponding to the second tab stacked structure becoming hot, as well as the risk of the isolation member becoming hot due to heat radiation from being too close to the second tab stacked structure.

[0008] In some embodiments, the minimum distance of the gap between the bending positions of the plurality of first tabs and the isolation member in the first direction is defined as the first minimum distance L1, the minimum distance of the gap between the bending positions of the plurality of second tabs and the isolation member in the first direction is defined as the second minimum distance L2, the melting point of the material of the plurality of first tabs is higher than the melting point of the material of the plurality of second tabs, and the second minimum distance L2 is less than or equal to the first minimum distance L1.

[0009] In the case of a battery cell embodiment in which the melting point of the first tab material is higher than that of the second tab material, the first tab material with the higher melting point requires a greater amount of welding heat to form a weld pool. Correspondingly, the amount of heat generated during welding of the first tab stacked structure is higher, and by making the first minimum distance L1 greater than or equal to the second minimum distance L2, the isolation member portion corresponding to the first tab stacked structure becomes hotter, and the risk of the isolation member becoming hotter due to heat radiation from being too close to the first tab stacked structure can be reduced.

[0010] In some embodiments, the bending position of the plurality of first tabs is the cutting base of the plurality of first tabs, and / or the bending position of the plurality of second tabs is the cutting base of the plurality of second tabs.

[0011] The bending positions of the multiple first tabs may be cutting positions where the tabs are cut in a portion of the current collector substrate of the first polar sheet that is not covered by the active material layer, and correspondingly, the first minimum distance L1 is the distance between the cutting base of the multiple first tabs and the isolation member in the first direction. The bending positions of the multiple second tabs may be cutting positions where the tabs are cut in a portion of the current collector substrate of the second polar sheet that is not covered by the active material layer, and correspondingly, the second minimum distance L2 is the distance between the cutting base of the multiple second tabs and the isolation member in the first direction.

[0012] In some embodiments, in the first direction, there is a third minimum distance L3 between the folding position of the plurality of first tabs and the top of the tabs of the plurality of first tabs, there is a fourth minimum distance L4 between the folding position of the plurality of second tabs and the top of the tabs of the plurality of second tabs, the first thickness t1 of the plurality of first tabs in the thickness direction of the first tabs is smaller than the second thickness t2 of the plurality of second tabs in the thickness direction of the second tabs, and the third minimum distance L3 is greater than or equal to the fourth minimum distance L4.

[0013] The third minimum distance L3 and the fourth minimum distance L4 represent the lengths of the first and second tabs that are folded and involved in lamination, respectively. The longer the length of the tabs involved in lamination, the greater the degree of tab overlap. The first thickness t1 of the first tab represents the thickness of a single layer of the first tab, and the second thickness t2 of the second tab represents the thickness of a single layer of the second tab. The thicker the single layer tab, the thicker the laminated tab structure becomes after lamination. In the case of a battery cell embodiment where the first thickness t1 is smaller than the second thickness t2, by setting the third minimum distance L3 to be greater than or equal to the fourth minimum distance L4, the thicknesses of the first and second tab laminated structures can be brought closer together, which helps reduce the risk of the isolation member portion burning or becoming hot due to differences in welding heat when forming the weld pool.

[0014] In some embodiments, in the first direction, there is a third minimum distance L3 between the folding position of the plurality of first tabs and the top of the tabs of the plurality of first tabs, a fourth minimum distance L4 between the folding position of the plurality of second tabs and the top of the tabs of the plurality of second tabs, the first thickness t1 of the plurality of first tabs in the thickness direction of the first tabs is greater than the second thickness t2 of the plurality of second tabs in the thickness direction of the second tabs, and the third minimum distance L3 is less than or equal to the fourth minimum distance L4.

[0015] The third minimum distance L3 and the fourth minimum distance L4 represent the lengths of the first and second tabs that are folded and involved in lamination, respectively. The longer the length of the tabs involved in lamination, the greater the degree of tab overlap. The first thickness t1 of the first tab represents the thickness of a single layer of the first tab, and the second thickness t2 of the second tab represents the thickness of a single layer of the second tab. The thicker the single layer tab, the thicker the laminated tab structure becomes after lamination. In the case of a battery cell embodiment where the first thickness t1 is greater than the second thickness t2, by setting the third minimum distance L3 to less than or equal to the fourth minimum distance L4, the thicknesses of the first and second tab laminated structures can be brought closer together, which helps reduce the risk of the isolation member portion burning or becoming hot due to differences in welding heat when forming the weld pool.

[0016] In some embodiments, the ratio A / B of the product A of the first thickness t1 in the thickness direction of the first tab and the third minimum distance L3 of the plurality of first tabs, and the product B of the second thickness t2 in the thickness direction of the second tab and the fourth minimum distance L4 of the plurality of second tabs, satisfies 0.2 ≤ A / B ≤ 4, and the units of the first thickness t1, second thickness t2, third minimum distance L3, and fourth minimum distance L4 are the same.

[0017] A product A of the first thickness t1 and the third minimum distance L3 represents the lamination thickness of the first tab laminated structure, and a product B of the second thickness t2 and the fourth minimum distance L4 represents the lamination thickness of the second tab laminated structure. The ratio of the product A to the product B represents the degree of difference between the lamination thicknesses of the first tab laminated structure and the second tab laminated structure. If the ratio A / B is too large, the first tab laminated structure is thick, so it is necessary to use high welding power during welding. When the welding heat is high, compared with the second tab laminated structure, the risk that the separator member portion corresponding to the first tab laminated structure is burned out or becomes heated increases. If the ratio A / B is too small, the second tab laminated structure is thick, so it is necessary to use high welding power during welding. When the welding heat is high, compared with the first tab laminated structure, the risk that the separator member portion corresponding to the second tab laminated structure is burned out or becomes heated increases. Therefore, by making the ratio A / B satisfy 0.2 ≤ A / B ≤ 4, the difference between the lamination thicknesses of the first tab laminated structure and the second tab laminated structure is reduced, thereby reducing the risk that the separator member portions corresponding to the first tab laminated structure and the second tab laminated structure are burned out or become heated.

[0018] In some embodiments, the ratio A / B satisfies 0.5 ≤ A / B ≤ 2.

[0019] By further restricting the ratio A / B to satisfy 0.5 ≤ A / B ≤ 2, the difference between the lamination thicknesses of the first tab laminated structure and the second tab laminated structure is further reduced, thereby effectively reducing the risk that the separator member portions corresponding to the first tab laminated structure and the second tab laminated structure are burned out or become heated.

[0020] In some embodiments, a ratio A / B of a product A of the first thickness t1 of the plurality of first tabs in the thickness direction of the first tabs and the third minimum distance L3 to a product B of the second thickness t2 of the plurality of second tabs in the thickness direction of the second tabs and the fourth minimum distance L4 satisfies A / B < 1, and a third thickness t3 of the first conductive member in the first direction is smaller than a fourth thickness t4 of the second conductive member in the first direction.

[0021] A product A of the first thickness t1 and the third minimum distance L3 represents the stacked thickness of the first tab stacked structure, and a product B of the second thickness t2 and the fourth minimum distance L4 represents the stacked thickness of the second tab stacked structure. In the embodiment of a battery cell where the product A is smaller than the product B, the second tab stacked structure with a larger stacked thickness needs to be welded using a higher welding output. When a higher laser output generates fluctuations, an excessively deep weld pool is likely to be formed, thereby increasing the risk that the isolation member is burned out or overheated. Therefore, using a thicker second conductive member increases the welding tolerance and reduces the possibility of forming an excessively deep weld pool, thereby reducing the risk that the isolation member portion corresponding to the second tab stacked structure is burned out or overheated. Alternatively, a thin first conductive member may be combined with a first tab stacked structure having a small stacked thickness, and welding may be performed with a low welding output. Correspondingly, a weld pool with an appropriate depth is likely to be formed, reducing the risk that the isolation member portion corresponding to the first tab stacked structure is burned out or overheated.

[0022] In some embodiments, a ratio A / B of a product A of a first thickness t1 of the plurality of first tabs in the thickness direction of the first tabs and the third minimum distance L3 to a product B of a second thickness t2 of the plurality of second tabs in the thickness direction of the second tabs and the fourth minimum distance L4 satisfies A / B > 1, the units of the first thickness t1, the second thickness t2, the third minimum distance L3, and the fourth minimum distance L4 are the same, and a third thickness t3 of the first conductive member in the first direction is larger than a fourth thickness t4 of the second conductive member in the first direction.

[0023] The product A of the first thickness t1 and the third minimum distance L3 represents the stacking thickness of the first tab stacked structure, and the product B of the second thickness t2 and the fourth minimum distance L4 represents the stacking thickness of the second tab stacked structure. In the case of a battery cell embodiment where product B is smaller than product A, the first tab stacked structure with a large stacking thickness requires welding using a higher welding power, and if the higher laser power generates waves, a weld pool that is too deep is likely to form, thereby increasing the risk of the isolation member burning out or overheating. Therefore, by using a thicker first conductive member, the welding tolerance is increased, reducing the possibility of a weld pool that is too deep, thereby reducing the risk of the isolation member portion corresponding to the first tab stacked structure burning out or overheating. Alternatively, a thin second conductive member can be combined with a second tab stacked structure with a small stacking thickness, and welding can be performed with a lower welding power, which in turn makes it easier to form a weld pool of appropriate depth, thereby reducing the risk of the isolation member portion corresponding to the second tab stacked structure burning out or overheating.

[0024] In some embodiments, in the first direction, both the first tab stacking structure and the second tab stacking structure are located at the same end of the winding structure.

[0025] Multiple first tabs and multiple second tabs may be arranged at the same end of the winding structure, and the folded and stacked first tab stacking structure and second tab stacking structure may be at different angular ranges of the end on that side, and correspondingly, the first conductive member and the second conductive member are both installed on the same side of the winding structure and welded to the first tab stacking structure and the second tab stacking structure, respectively.

[0026] In some embodiments, in the first direction, the first tab stacking structure and the second tab stacking structure are located at opposite ends of the wound structure, respectively.

[0027] Multiple first tabs and multiple second tabs may be positioned at opposite ends of the winding structure, and the folded and stacked multiple first tabs and multiple second tabs form a first tab stacking structure and a second tab stacking structure at both ends of the winding structure, respectively, and correspondingly, a first conductive member and a second conductive member are also installed on both sides of the winding structure and welded to the first tab stacking structure and the second tab stacking structure, respectively.

[0028] In some embodiments, the battery cell further includes an outer case having a cavity for housing the electrode assembly, the first conductive member, and the second conductive member, and electrode terminals mounted on the wall of the outer case and electrically connected to the first conductive member or the second conductive member.

[0029] The first and second tab stacked structures formed at the ends of the wound structure of the electrode assembly are welded to the first and second conductive members, respectively, and are electrically connected to the electrode terminals installed on the wall of the outer case via the first or second conductive member. Because the stacked multilayer tab structure has a greater thickness, it is less likely to burn through when welding to the conductive member, reducing the risk of the isolation member within the electrode assembly burning out or becoming overheated during welding, thereby improving the welding quality of the welded area and enhancing safety in use.

[0030] In some embodiments, the outer case includes a housing and an end cover, one end of the housing has an opening, the end cover covers the opening, the housing includes a side wall and a bottom wall, the side wall surrounds the outside of the electrode assembly, the bottom wall is positioned opposite the opening, and the wall portion of the outer case is either the end cover or the bottom wall.

[0031] The first and second tab stacked structures formed at the ends of the wound structure of the electrode assembly are welded to the first and second conductive members, respectively, and are electrically connected to electrode terminals installed on the bottom wall of the end cover or housing via the first or second conductive member. This effectively reduces the risk of isolation members within the electrode assembly burning out or becoming overheated during welding, improving the welding quality of the welded area and enhancing safety in use.

[0032] In some embodiments, the first polarity sheet further comprises a first current collector substrate, the plurality of first tabs connected to the first current collector substrate and spaced apart along the winding direction, and in the first direction, the bent positions of the plurality of first tabs are located on the side of the isolation member away from the first current collector substrate; the second polarity sheet further comprises a second current collector substrate, the plurality of second tabs connected to the second current collector substrate and spaced apart along the winding direction, and in the first direction, the bent positions of the plurality of second tabs are located on the side of the isolation member away from the second current collector substrate.

[0033] At least a portion of the plurality of first tabs, which are connected to the first current collector substrate and spaced apart along the winding direction, can be bent at the ends of the winding structure to form a tightly packed first tab laminated structure of a constant thickness, which can be welded to the first conductive member to achieve a reliable electrical connection. Similarly, at least a portion of the plurality of second tabs, which are connected to the second current collector substrate and spaced apart along the winding direction, can be bent at the ends of the winding structure to form a tightly packed second tab laminated structure of a constant thickness, which can be welded to the second conductive member to achieve a reliable electrical connection.

[0034] One aspect of this disclosure provides a battery including the battery cell.

[0035] A battery using the aforementioned battery cell can effectively improve safety during use.

[0036] One aspect of this disclosure provides a power consumption device including the battery.

[0037] The power consumption device using the aforementioned battery can effectively improve safety during use.

[0038] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings required for the embodiments of this disclosure are briefly described below. It should be understood that the drawings shown below represent only a few embodiments of this disclosure, and those skilled in the art can obtain further drawings based on these drawings without requiring any creative effort.

[0039] This disclosure can be better understood by referring to the drawings and the detailed description below. [Brief explanation of the drawing]

[0040] [Figure 1] This is a schematic diagram of the structure of several embodiments of a power consumption device based on this disclosure. [Figure 2] This is an exploded schematic diagram of several embodiments of a battery based on this disclosure. [Figure 3] This is a schematic diagram showing the connection of multiple battery cells in several embodiments of the battery based on this disclosure. [Figure 4] This is an exploded schematic diagram of several embodiments of a battery cell based on this disclosure. [Figure 5] This is a schematic longitudinal cross-sectional view passing through the winding axis CL of several embodiments of a battery cell according to the present disclosure. [Figure 6] This is a schematic cross-sectional view of a wound structure in several embodiments of an electrode assembly according to the present disclosure. [Figure 7] This is a schematic exploded view of electrode assemblies and conductive members in several embodiments of battery cells based on this disclosure. [Figure 8] This is an exploded schematic diagram of an electrode assembly and conductive member in yet another embodiment of a battery cell based on the present disclosure. [Figure 9] and [Figure 10]These are schematic diagrams of the assembly structure and cross-section of the conductive member in Figure 8. [Figure 11] This is a schematic diagram showing the unfolded state of the polarity sheet and tab in some embodiments of the electrode assembly according to this disclosure. [Figure 12] This is a schematic diagram showing the unfolded state of the polarity sheet and tab in yet another embodiment of the electrode assembly according to this disclosure. [Figure 13] This is a schematic cross-sectional view of a structure in which a tab-laminated structure and a conductive member are welded together in several embodiments of the electrode assembly based on this disclosure.

[0041] Please understand that the dimensions of each part shown in the drawings are not drawn according to actual proportions. Also, identical or similar reference numerals indicate identical or similar components. [Explanation of Symbols]

[0042] 10 Electrode Assembly 11. First polarity sheet 11A First current collector substrate 11B Tab 1 11C 1st active material layer 111 First Tab Laminated Structure 11f Folding position of the first tab 11r Cutting base of the first tab 11t Top of the first tab 12. Second polarity sheet 12B Second Tab 12C 2nd active material layer 121 Second Tab Laminated Structure 12f Folding position of the second tab 12r Cutting base of the second tab 12t Top of the tab on the second tab 13 Isolation member 100 winding structure 21 First conductive member 22 Second conductive member 23 Second insulating member 30 battery cells 31 Outer case 311 Housing 311B side wall 311C bottom wall 311A Aperture 311D through hole 312 End cover 32 Electrode terminal 33 First insulating member 34 Electrode extraction section 35 Pressure Reducing Member 40 batteries 41 cabinets 42. Case cover 43 Bus Bar 50 vehicles wd Winding direction CL winding shaft d1 1st direction d2 2nd direction [Modes for carrying out the invention]

[0043] Embodiments of the present disclosure will be described in more detail below with reference to the drawings and examples. The detailed description of the following embodiments and drawings are used to illustrate the principles of the present disclosure, but are not intended to limit the scope of the present disclosure, and the present disclosure is not limited to the embodiments described.

[0044] Unless otherwise stated, in this disclosure, “multiple” means two or more; terms such as “up,” “down,” “left,” “right,” “inside,” and “outside” refer to directions or positional relationships that are merely intended to facilitate and simplify the explanation of this disclosure, and do not indicate or imply that the devices or elements in question have a specific direction, or that they are composed of and should be operated in a specific direction, and therefore should not be understood as limiting this disclosure. Furthermore, terms such as “first,” “second,” and “third” are used solely for explanatory purposes and should not be understood as indicating or implying relative importance. “Perpendicular” does not mean perpendicular in the strict sense, but is within an acceptable margin of error. “Parallel” does not mean parallel in the strict sense, but is within an acceptable margin of error.

[0045] All directional expressions appearing in the following description refer to the directions shown in the figures and do not limit the specific structure of the disclosure. Further explanation is required in this disclosure that, unless otherwise explicitly provided and limited, the terms “attached,” “connected,” and “connected” should be understood broadly, for example, as fixed connections, removable connections, or integral connections. Connections may be direct or indirect, via an intermediate medium. Those skilled in the art will be able to understand the specific meaning of these terms in this disclosure depending on the specific circumstances.

[0046] Several embodiments of the present invention will be described in detail below with reference to the drawings. The features of the embodiments described below can be combined with each other, as long as they do not contradict each other.

[0047] In this disclosure, "multiple" refers to two or more (including two).

[0048] In the embodiments of this disclosure, the battery cell may be a secondary battery, which is a battery cell that can continue to be used by activating the active material through a method of charging after the battery cell has been discharged.

[0049] The battery cell may be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited thereto.

[0050] A battery cell includes an electrode assembly. The electrode assembly includes a first polarity sheet and a second polarity sheet with opposite polarities, and further includes an isolation member placed between the first and second polarity sheets. In some embodiments, the first polarity sheet is the positive electrode sheet and the second polarity sheet is the negative electrode sheet. In some other embodiments, the first polarity sheet is the negative electrode sheet and the second polarity sheet is the positive electrode sheet. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) reciprocate between the positive and negative electrode sheets for insertion and removal. The isolation member is placed between the positive and negative electrode sheets and serves to prevent short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0051] In some embodiments, the positive electrode sheet may include a positive electrode current collector substrate and a positive electrode active material layer placed on at least one surface of the positive electrode current collector substrate.

[0052] As an example, the positive electrode current collector substrate has two opposing surfaces in the thickness direction, and the positive electrode active material layer is provided on one or both of the two opposing surfaces of the positive electrode current collector substrate.

[0053] As an example, the positive electrode current collector substrate can be a metal foil or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The composite current collector may include a polymer substrate layer and a metal layer. The composite current collector can be formed by placing a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer material substrate (for example, a substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0054] As an example, the positive electrode active material may include at least one selected from the group consisting of lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, the present disclosure is not limited to these materials, and other conventional materials usable as a positive electrode active material layer of a battery may be used. Only one of these positive electrode active material layers may be used alone, or two or more of them may be used in combination. Examples of the lithium-containing phosphate include, but are not limited to, at least one selected from the group consisting of lithium ferrous phosphate (e.g., LiFePO₄, also referred to as LFP), composite materials of lithium ferrous phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO₄), composite materials of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and composite materials of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides include lithium cobalt oxide (e.g., LiCoO₂), lithium nickel oxide (e.g., LiNiO₂), lithium manganese oxide (e.g., LiMnO₂, LiMn₂O₄), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O₂ (also referred to as NCM 333 ) , 0.5 Co 0.2 Mn 0.3 O₂ (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O₂ (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O₂ (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O₂ (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (LiNi 0.85 Co 0.15 Al 0.05 O₂, etc.) and modified compounds thereof, but are not limited to at least one of these.

[0055] In some embodiments, the negative electrode sheet may include a negative electrode current collector substrate.

[0056] As an example, the negative electrode current collector substrate can be a metal foil, foamed metal, or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon. The composite current collector may include a polymer substrate layer and a metal layer. The composite current collector can be formed by placing a metal material (such as copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys) on a polymer material substrate (for example, a substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0057] In some embodiments, the negative electrode sheet may include a negative electrode current collector substrate and a negative electrode active material layer placed on at least one surface of the negative electrode current collector substrate.

[0058] As an example, the negative electrode current collector substrate has two opposing surfaces in its own thickness direction, and the negative electrode active material layer is provided on one or both of the two opposing surfaces of the negative electrode current collector substrate.

[0059] As an example, the negative electrode active material layer can be a negative electrode active material layer for battery cells known in the art. For example, the negative electrode active material layer may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. Silicon-based materials can be selected from at least one of elemental silicon, silicon oxide, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials can be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this disclosure is not limited to these materials, and other conventional materials that can be used as the negative electrode active material layer of a battery may be used. These negative electrode active material layers may be used individually or in combination of two or more types.

[0060] In some embodiments, the material of the positive electrode current collector substrate may be aluminum, and the material of the negative electrode current collector substrate may be copper.

[0061] In some embodiments, the separating member is a separator. The disclosure does not particularly limit the type of separator, and any known porous structure separator having good chemical and mechanical stability can be selected.

[0062] As an example, the main material of the separator can be selected from at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator may be a single-layer film or a multilayer composite film, and is not particularly limited. If the separator is a multilayer composite film, the materials of each layer may be the same or different, and is not particularly limited. The isolation member may be a single member positioned between the positive electrode sheet and the negative electrode sheet, or it may be positioned between the positive electrode sheet and the negative electrode sheet and at the same time attached to the surface of the positive electrode sheet and / or the surface of the negative electrode sheet.

[0063] In some embodiments, the isolation member is a solid electrolyte. The solid electrolyte is placed between the positive electrode sheet and the negative electrode sheet and simultaneously serves to transfer ions and isolate the positive and negative electrodes.

[0064] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The disclosure does not particularly limit the type of electrolyte, which can be selected as needed. The electrolyte may be liquid, gel-like, or solid.

[0065] For example, a liquid electrolyte includes an electrolyte salt and a solvent.

[0066] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluoride phosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoride arsenate, lithium bisfluorosulfonylimide, lithium bistrifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bisoxalate borate, lithium difluorobisoxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0067] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, ethyl methyl sulfone, and diethyl sulfone. The solvent is selectively an ether-based solvent. The ether-based solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0068] For example, a gel-like electrolyte contains a polymer-based skeletal network and can be combined with an ionic liquid-lithium salt.

[0069] As an example, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0070] As an example, the polymer solid electrolyte may be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymer, polyionic liquid lithium salt, cellulose, etc.

[0071] As an example, the inorganic solid electrolyte may be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphate sulfur, silver sulfur germanium ore), amorphous sulfide), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0072] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0073] In some embodiments, the electrode assembly includes a wound structure. A positive electrode sheet, a negative electrode sheet, and an isolation member are wound together to form a wound structure. One or more positive electrode sheets and negative electrode sheets are installed. As an example, multiple positive electrode sheets and multiple negative electrode sheets are installed alternately along the thickness direction of the polarity sheets.

[0074] In some embodiments, the shape of the electrode assembly may be cylindrical, flattened, or polygonal prism-shaped, etc.

[0075] In some embodiments, the positive electrode sheet includes a positive electrode tab, and the negative electrode sheet includes a negative electrode tab, and the positive and negative electrode tabs are used to derive current from the electrode assembly. The positive and negative electrode tabs are connected to the positive and negative electrode current collector substrates, respectively. The tabs may be formed by splitting or cutting the current collector substrate, or they may be connected to the sides of the current collector substrate by welding.

[0076] In some embodiments, the battery cell may include an outer case. The outer case is used to enclose components such as the electrode assembly and electrolyte. The outer case may be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite case), or an aluminum-plastic film, etc.

[0077] For example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft pack battery cell, or a battery cell of other shape. A prismatic battery cell includes a rectangular battery cell, a blade-shaped battery cell, and a polygonal prismatic battery, and a polygonal prismatic battery is a hexagonal prismatic battery, etc.

[0078] The batteries referred to in the embodiments of this disclosure refer to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0079] In some embodiments, the battery may be a battery module, and if there are multiple battery cells, the multiple battery cells are arranged and fixed to form a single battery module. The battery module may include multiple battery cells connected in series, in parallel, or in series-parallel.

[0080] In some embodiments, the battery may be a battery pack, which includes a housing and battery cells, and the battery cells or battery module are housed within the housing.

[0081] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, the housing portion may be at least part of the vehicle's floor, or at least part of the vehicle's crossbeams and longitudinal beams.

[0082] In some embodiments, the battery may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0083] In some related technologies, the polarity sheet in an electrode assembly mainly consists of a current collector substrate and an active material layer placed on the surface of the current collector substrate, and in the width direction of the polarity sheet, the portion that extends beyond the active material layer of the current collector substrate is the current collection output region. This region is obtained by cutting to obtain multiple smaller tabs located on the side of the current collector substrate, with cut and broken portions provided between adjacent tabs, thereby making each tab independent of the others.

[0084] These small tabs are bent and flattened at the ends of the electrode assembly after winding to form a dense tab-laden structure. However, when the tab-laden structure and the current collector disk are welded using methods such as laser welding, the heat generated from the tab-laden structure can heat the isolation members that come into contact with the tabs through heat conduction, potentially leading to damage or defects in the isolation members and affecting product yield and safety of use.

[0085] In view of this, embodiments of the present disclosure provide a battery cell including an electrode assembly, a first conductive member, and a second conductive member. The electrode assembly includes a first polar sheet, a second polar sheet, and an isolation member, wherein the polarities of the first polar sheet and the second polar sheet are opposite, the isolation member is located between the first polar sheet and the second polar sheet, the first polar sheet, the second polar sheet, and the isolation member are wound along the winding direction to form a wound structure, the first polar sheet includes a plurality of first tabs bent along the end of the wound structure to form a first tab stacked structure, the second polar sheet includes a plurality of second tabs bent along the end of the wound structure to form a second tab stacked structure, the first conductive member is welded to the first tab stacked structure, and the second conductive member is welded to the second tab stacked structure, and in a first direction parallel to the extension direction of the winding axis of the wound structure, at least one of the bending positions of the plurality of first tabs and the bending positions of the plurality of second tabs has a gap between it and the isolation member in the first direction.

[0086] Multiple first tabs and multiple second tabs are bent at the ends of the wound structure to form a first tab laminated structure and a second tab laminated structure, and at least one of the bending positions of the multiple first tabs and the multiple second tabs has a gap with the isolation member in the first direction, thereby reducing the risk of the isolation member becoming hot due to the heat released from the tabs being conducted to the isolation member during the welding process between the tab laminated structure and the conductive member, thereby improving product yield and safety of use.

[0087] The battery cells of the embodiments of this disclosure can be applied to various types of batteries. A battery includes a housing that provides a space for housing a battery module, and a battery module that is mounted within the housing. The housing may be made of a metal material. The battery module may include a plurality of battery cells connected in series, in parallel, or in series-parallel. A battery cell is the smallest unit that makes up a battery. A battery cell includes an electrode assembly that can generate an electrochemical reaction.

[0088] The batteries in the embodiments of this disclosure are applicable to various power-consuming devices that use batteries. Power-consuming devices may include mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecraft, electric toys, and power tools. For example, spacecraft include aircraft, rockets, spaceplanes, and spacecraft; electric toys include stationary or mobile electric toys such as game consoles, electric toy cars, electric toy ships, and electric toy aircraft; and power tools include metal cutting power tools such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drivers, concrete vibrators, and electric planers, as well as polishing power tools, assembly power tools, and railway power tools. The embodiments of this disclosure are not particularly limited to the above power-consuming devices. The batteries are used to supply power to power-consuming devices such as vehicles, for example, to supply power for control or power for driving a vehicle.

[0089] Figure 1 is a schematic diagram of the structure of several embodiments of a power consumption device based on this disclosure. For convenience of explanation, a vehicle will be used as an example of a power consumption device. The vehicle 50 may be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, etc. The battery 40 can be installed at the bottom of the vehicle 50, or at the front or rear of the vehicle.

[0090] The battery 40 is used to supply power to the vehicle 50. For example, the battery 40 can be used as the operating power source for the vehicle 50's circuit system, meeting the power requirements for starting, navigation, and driving the vehicle 50. In addition to being an operating power source for the vehicle 50, the battery 40 can also be used as a drive power source for the vehicle 50, providing driving power to the vehicle 50 in place of or partially replacing fuel or natural gas.

[0091] Axles, wheels, a motor, and a controller can be installed inside the vehicle 50, and the controller is used to control the battery 40 and supply power to the motor. For example, if the vehicle 50 uses the battery 40 as its power source, the battery 40 supplies the motor with the power necessary for constant speed and acceleration, either in lieu of or partially substituting for fuel or natural gas. The motor is used to drive the rotation of the axles, thereby moving and rotating the wheels.

[0092] Figure 2 is an exploded schematic diagram of several embodiments of the battery according to the present disclosure. Figure 3 is a schematic diagram of the connections of multiple battery cells in several embodiments of the battery according to the present disclosure.

[0093] Referring to Figure 2, in some embodiments, the battery 40 includes a housing 41, a housing cover 42 that covers the opening side of the housing 41, and one or more battery cells 30 installed inside the housing 41. The housing 41 and housing cover 42 provide a housing space for the battery cells 30 and can provide functions such as cooling, sealing, and collision prevention, and can also prevent liquids or other foreign matter from adversely affecting the charging, discharging, or safety of the battery cells.

[0094] The housing 41 and housing cover 42 may have various shapes, such as a rectangular parallelepiped or a cylinder. The housing 41 may have a hollow structure with one side open, and the housing cover 42 may have a plate-like structure. The housing cover 42 covers the open side of the housing 41 and forms an internal storage space. In another embodiment, the housing 41 has a hollow structure with one side open, and the housing cover 42 also has a hollow structure with one side open, and the open side of the housing cover 42 covers the open side of the housing 41 and forms an internal storage space.

[0095] Referring to Figures 2 and 3, each battery cell 30 is electrically connected to the others by series connection, parallel connection, or series-parallel connection, thereby realizing the required electrical characteristic parameters of the battery 40. Series-parallel connection refers to the presence of both series and parallel connections among multiple battery cells 30. Adjacent battery cells 30 may be electrically connected via busbars 43. Multiple battery cells 30 are installed in rows, and one or more rows of battery cells 30 can be installed in the housing 41 as needed.

[0096] In some embodiments, each battery cell 30 of the battery 40 may be arranged along at least one of the longitudinal and width directions of the housing 41. Depending on the actual requirements, at least one row or one column of battery cells 30 may be installed. If necessary, an additional layer or multiple layers of battery cells 30 may be installed in the height direction of the battery 40.

[0097] In some embodiments, multiple battery cells 30 are first connected in series, in parallel, or in series-parallel to form a battery module, and then the multiple battery modules are further connected in series, in parallel, or in series-parallel to form an integrated unit which is then housed in the housing 41. In some other embodiments, all the battery cells 30 are directly connected in series, in parallel, or in series-parallel, and then the integrated unit composed of all the battery cells 30 is housed in the housing.

[0098] Figure 4 is an exploded schematic view of several embodiments of a battery cell according to the present disclosure. Figure 5 is a longitudinal schematic view of several embodiments of a battery cell according to the present disclosure, passing through the winding axis CL. Figure 6 is a cross-sectional schematic view of the winding structure in several embodiments of an electrode assembly according to the present disclosure. Figure 7 is an exploded schematic view of the electrode assembly and conductive members in several embodiments of a battery cell according to the present disclosure.

[0099] Referring to Figures 3 to 7, in some embodiments, the battery cell 30 includes an electrode assembly 10, a first conductive member 21, and a second conductive member 22. The electrode assembly 10 includes a first polarity sheet 11, a second polarity sheet 12, and an isolation member 13, wherein the polarities of the first polarity sheet 11 and the second polarity sheet 12 are opposite, the isolation member 13 is located between the first polarity sheet 11 and the second polarity sheet 12, and the first polarity sheet 11, the second polarity sheet 12, and the isolation member 13 are wound along the winding direction wd to form a wound structure 100.

[0100] In Figure 6, the polar sheet winding rings formed within the winding structure 100 of the first polar sheet 11 and the second polar sheet 12 may be arranged alternately from outside to inside, at least partially. The isolation member 13 can be in the form of a separator and can be installed between the first polar sheet 11 and the second polar sheet 12.

[0101] The first polarity sheet 11 may include a first current collector substrate 11A and a plurality of first tabs 11B, the plurality of first tabs 11B being connected to the first current collector substrate 11A and spaced apart along the winding direction wd, and at least a portion of the plurality of first tabs 11B being bent at the ends of the winding structure 100 to form a first tab stacking structure 111.

[0102] The second polarity sheet 12 may include a second current collector substrate 12A and a plurality of second tabs 12B, the plurality of second tabs 12B being connected to the second current collector substrate 12A and spaced apart along the winding direction wd, and at least a portion of the plurality of second tabs 12B being bent at the ends of the winding structure 100 to form a second tab laminated structure 121.

[0103] The first conductive member 21 is welded to the first tab stacked structure 111, and the second conductive member 22 is welded to the second tab stacked structure 121. The welding of the conductive members to the tab stacked structure may be performed using a laser or other method, and accordingly, the welded area shows a heated and molten liquid metal portion, i.e., a weld pool, which is a liquid metal portion that has been molten into a certain geometric shape.

[0104] Referring to Figures 4 and 5, in some embodiments, the battery cell 30 may further include an outer case 31 and electrode terminals 32. The outer case 31 comprises a cavity that houses the electrode assembly 10, the first conductive member 21, and the second conductive member 22. The electrode terminals 32 are mounted on the wall of the outer case 31 and are electrically connected to either the first conductive member 21 or the second conductive member 22.

[0105] The cavity of the outer case 31 can accommodate not only the electrode assembly 10 but also the electrolyte. The shape of the outer case 31 may be determined based on the shape of one or more electrode assemblies 10 housed in the cavity, for example, the shape of the outer case 31 may be a hollow rectangular parallelepiped, a hollow cube, or a hollow cylinder.

[0106] In Figures 4 and 5, the outer case 31 may include a housing 311 and an end cover 312. The housing 311 is a hollow structure with openings 311A ​​at one or both ends, and its material may be one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, or plastic. The end cover 312 can be made of a metallic or non-metallic material and can be fixedly connected to the housing 311 by welding, bonding, or fastening member connection.

[0107] One end of the housing 311 has an opening 311A, and the end cover 312 covers the opening 311A. In Figure 5, the housing 311 may include a side wall 311B and a bottom wall 311C. The side wall 311B surrounds the outside of the electrode assembly 10, and the bottom wall 311C is installed opposite the opening 311A. The wall portion of the outer case 31 is either the end cover 312 or the bottom wall 311C. Correspondingly, the electrode terminals 32 may be installed on the end cover 312 or on the bottom wall 311C.

[0108] In the case of a cylindrical battery cell, the housing 311 may be a cylindrical hollow structure having an opening 311A ​​at one end, and the end cover 312 may be a disc-shaped structure that fits the opening 311A. The electrode terminals 32 may be installed on the bottom wall 311C of the housing 311 on the side away from the end cover 312.

[0109] In Figure 4, a through hole 311D may be provided in the bottom wall 311C. Referring to Figure 5, the electrode terminal 32 may be installed in the through hole 311D via the electrode lead-out portion 34 and the first insulating member 33. At least a portion of the electrode lead-out portion 34 may protrude from the outer surface of the bottom wall 311C, thereby enabling electrical connection between different battery cells 30 via the busbar 43 (shown in Figure 3). The first insulating member 33 is used to provide insulation between the electrode lead-out portion 34 and the housing 311, and can be made of rubber or plastic. Preferably, openings are provided at both ends of the housing and both are covered by end covers, and the electrode lead-out portion and electrode terminal may be installed in the end covers.

[0110] Referring to Figures 4 and 5, a pressure reducing member 35 can be installed on the end cover 312. A pressure reducing member is an element or component that operates when the internal pressure or temperature of a battery cell reaches a predetermined threshold, thereby releasing the internal pressure or temperature. The design of the threshold varies depending on the design requirements. The threshold may depend on one or more materials among the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell. The pressure reducing member can take the form of an explosion-proof valve, air valve, pressure reducing valve, or safety valve, and specifically can use a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure reducing member performs an action or a weak structure provided in the pressure reducing member is destroyed, forming an opening or flow path that allows the internal pressure or temperature to escape.

[0111] The emissions from battery cells referred to herein include, but are not limited to, electrolyte, dissolved or fragmented positive and negative electrode sheets, separator fragments, high-temperature and high-pressure gases produced by the reaction (e.g., flammable gases such as CH4 and CO), and flames.

[0112] Referring to Figures 5 and 7, in some embodiments, in the first direction d1, the first tab stacking structure 111 and the second tab stacking structure 121 are located at opposite ends of the winding structure 100, respectively. In the case of a cylindrical winding structure 100, the first direction d1 and the extension direction of the winding axis CL of the winding structure 100 are parallel.

[0113] Accordingly, the first conductive member 21 and the second conductive member 22 are located on both sides of the electrode assembly 10 along the first direction d1 and are welded to the first tab stacked structure 111 and the second tab stacked structure 121 at both ends of the electrode assembly 10, respectively, and are also welded to the electrode lead-out portion 34 and the end cover 312, respectively. The first conductive member 21 and the second conductive member 22 can, as current collectors, realize electrical connections between the electrode assembly 10 and the electrode terminals 32, and also electrical connections between the electrode assembly 10 and structures such as the end cover 312, respectively.

[0114] At least one of the first conductive member 21 and the second conductive member 22 is a metal conductor, such as copper, iron, aluminum, steel, or an aluminum alloy. In some embodiments, at least one of the first conductive member 21 and the second conductive member 22 may include a current collector disk or other structures.

[0115] Figure 8 is an exploded schematic diagram of the electrode assembly and conductive members in yet another embodiment of a battery cell according to the present disclosure. Figures 9 and 10 are schematic diagrams of the assembled structure and cross-section of the conductive members in Figure 8, respectively.

[0116] Referring to Figures 8, 9, and 10, in some embodiments, in the first direction d1, both the first tab stacking structure 111 and the second tab stacking structure 121 are located at the same end of the winding structure 100. Correspondingly, the multiple first tabs 11B and the multiple second tabs 12B may be located at the same end of the winding structure 100, and the folded and stacked first tab stacking structure 111 and the second tab stacking structure 121 may be located at different angular ranges of that end. The first conductive member 21 and the second conductive member 22 are also located on the same side of the winding structure 100 and are welded to the first tab stacking structure 111 and the second tab stacking structure 121, respectively.

[0117] Referring to Figure 8, both the first conductive member 21 and the second conductive member 22 may be fan-shaped, and a second insulating member 23 may be installed at the end of the wound structure on that side in order to insulate the first conductive member 21 and the second conductive member 22 from each other, and both the first conductive member 21 and the second conductive member 22 are assembled with the second insulating member 23, and the assembled structure shown in Figure 8 is welded to the first tab laminated structure 111 and the second tab laminated structure 121.

[0118] Referring to Figures 9 and 10, the second insulating member 23 may be provided with a hollow portion and an opening that penetrate along the first direction d1, the opening being used to accommodate the first conductive member 21 and the hollow portion accommodating the second conductive member 22. The second insulating member 23 can be made of rubber or plastic.

[0119] Figure 11 is a schematic diagram of the polarity sheet and tabs in the unfolded state in several embodiments of the electrode assembly according to this disclosure. Figure 12 is a schematic diagram of the polarity sheet and tabs in the unfolded state in yet another embodiment of the electrode assembly according to this disclosure. Figure 13 is a schematic cross-sectional view of the structure in which the tab stacked structure and conductive member are welded in several embodiments of the electrode assembly according to this disclosure.

[0120] Figure 11 corresponds to an embodiment in which a plurality of first tabs 11B and a plurality of second tabs 12B are arranged at opposite ends of the winding structure 100, and Figure 12 corresponds to an embodiment in which a plurality of first tabs 11B and a plurality of second tabs 12B are arranged at the same end of the winding structure 100. In Figures 11 and 12, the second direction d2 is parallel to the longitudinal direction of the first polar sheet 11 or the second polar sheet 12 and corresponds to the winding direction wd after unfolding, the first direction d1 is parallel to the winding axis CL of the winding structure 100 and is also parallel to the width direction of the first polar sheet 11 or the second polar sheet 12.

[0121] Referring to Figures 11 and 12, in a first direction d1 parallel to the extension direction of the winding axis CL of the winding structure 100, the bending positions 11f of the plurality of first tabs 11B are located on the side of the isolation member 13 away from the first current collector base material 11A, and the bending positions 12f of the plurality of second tabs 12B are located on the side of the isolation member 13 away from the second current collector base material 12A.

[0122] In Figures 11 and 12, the bend positions of the first tab 11B and the second tab 12B are indicated by dashed lines. In an embodiment in which multiple tabs are cut on the current collector substrate by a laser or the like, the bend position 11f of the multiple first tabs 11B may be the cutting base 11r of the multiple first tabs 11B, or it may be a position closer to the upper part 11t of the first tab 11B than the cutting base 11r of the first tab 11B. Similarly, the bend position 12f of the multiple second tabs 12B may be the cutting base 12r of the multiple second tabs 12B, or it may be a position closer to the upper part 12t of the second tab 12B than the cutting base 12r of the second tab 12B.

[0123] Multiple first tabs 11B are bent at least partially at the ends of the wound structure 100 to form a first tab stacked structure 111, and multiple second tabs 12B are bent at least partially at the ends of the wound structure 100 to form a second tab stacked structure 121.

[0124] The bending positions 11f of the multiple first tabs 11B have gaps between them and the isolation member 13 in the first direction d1, thereby reducing the risk of heat released from the first tab laminated structure during welding being conducted to the isolation member 13 and causing the isolation member 13 to overheat. Accordingly, the minimum distance of the gap between the bending positions 11f of the multiple first tabs 11B and the isolation member 13 in the first direction d1 is defined as the first minimum distance L1.

[0125] The bending positions 12f of the multiple second tabs 12B have gaps between them and the isolation member 13 in the first direction d1, thereby reducing the risk of heat released from the second tab laminated structure during welding being conducted to the isolation member 13 and causing the isolation member 13 to overheat. Accordingly, the minimum distance of the gap between the bending positions 12f of the multiple second tabs 12B and the isolation member 13 in the first direction d1 is defined as the second minimum distance L2.

[0126] If the bending positions 11f of the multiple first tabs 11B are positions where the tabs are cut in a portion of the first current collector substrate 11A that is not covered by the first active material layer 11C, then the first minimum distance L1 is the minimum distance between the cutting base 11r of the multiple first tabs 11B and the isolation member 13 in the first direction d1. If the bending positions 12f of the multiple second tabs 12B are positions where the tabs are cut in a portion of the second current collector substrate 12A If the tab is cut in a portion not covered by the active material layer, the second minimum distance L2 is the minimum distance between the cutting base 12r of the multiple second tabs 12B and the isolation member 13 in the first direction d1.

[0127] In some embodiments, the melting points of the materials of the plurality of first tabs 11B are lower than the melting points of the materials of the plurality of second tabs 12B, and the first minimum distance L1 is less than or equal to the second minimum distance L2. For example, if metallic aluminum with a melting point of 660°C is used for the first tab 11B and metallic copper with a melting point of 1083°C is used for the second tab 12B, the first minimum distance L1 in this embodiment is set to be less than or equal to the second minimum distance L2.

[0128] In an embodiment of a battery cell where the melting point of the material of the first tab 11B is lower than the melting point of the material of the second tab 12B, the material of the second tab 12B, which has a higher melting point, requires a larger amount of welding heat to form a weld pool, and accordingly, the second tab laminated structure 121 generates a larger amount of heat during welding. If the amount of heat generated from the second tab laminated structure 121 is large, the isolation member 13 is at risk of burning out due to thermal radiation even if it is not in contact with the second tab laminated structure 121. Therefore, by making the second minimum distance L2 greater than or equal to the first minimum distance L1, the risk of the isolation member 13 corresponding to the second tab laminated structure 121 becoming partially hot, and the risk of the isolation member 13 burning out due to thermal radiation because it is too close to the second tab laminated structure 121 can be reduced.

[0129] In some embodiments, the melting points of the materials of the plurality of first tabs 11B are higher than the melting points of the materials of the plurality of second tabs 12B, and the second minimum distance L2 is less than or equal to the first minimum distance L1. For example, if metallic copper with a melting point of 1083°C is used for the first tab 11B and metallic aluminum with a melting point of 660°C is used for the second tab 12B, the second minimum distance L2 in this embodiment is set to be less than or equal to the first minimum distance L1.

[0130] In the case of an embodiment of a battery cell in which the melting point of the material of the first tab 11B is higher than the melting point of the material of the second tab 12B, the material of the first tab 11B with a higher melting point requires a larger amount of welding heat to form a weld pool, and accordingly, the first tab stacked structure 111 generates a larger amount of heat during welding. If the amount of heat generated from the first tab stacked structure 111 is large, the isolation member 13 is at risk of burning out due to thermal radiation even if it is not in contact with the first tab stacked structure 111. Therefore, by making the first minimum distance L1 greater than or equal to the second minimum distance L2, the risk of the isolation member corresponding to the first tab stacked structure 111 becoming partially hot, and the risk of the isolation member burning out due to thermal radiation because it is too close to the first tab stacked structure 111 can be reduced.

[0131] Referring to Figures 11 and 12, in the first direction d1, there is a third minimum distance L3 between the folding position 11f of the plurality of first tabs 11B and the upper tab portion 11t of the plurality of first tabs 11B, and a fourth minimum distance L4 between the folding position 12f of the plurality of second tabs 12B and the upper tab portion 12t of the plurality of second tabs 12B.

[0132] If the bending positions 11f of the multiple first tabs 11B are positions where the tabs are cut in a portion of the first current collector substrate 11A that is not covered by the first active material layer 11C, the third minimum distance L3 is the minimum distance between the cutting base 11r of the multiple first tabs 11B and the upper part 11t of the multiple first tabs 11B in the first direction d1, and corresponds to the height of the first tab 11B. If the bending positions 12f of the multiple second tabs 12B are positions where the tabs are cut in a portion of the current collector substrate that is not covered by the active material layer, the fourth minimum distance L4 is the minimum distance between the cutting base 12r of the multiple second tabs 12B and the upper part 12t of the multiple second tabs 12B in the first direction d1, and corresponds to the height of the second tab 12B.

[0133] Figure 13 is a schematic cross-sectional view of a structure in which a tab-laminated structure and conductive member are welded together in several embodiments of an electrode assembly according to the present disclosure.

[0134] Referring to Figures 11, 12, and 13, in some embodiments, the first thickness t1 in the thickness direction of the plurality of first tabs 11B is smaller than the second thickness t2 in the thickness direction of the plurality of second tabs 12B, and the third minimum distance L3 is greater than or equal to the fourth minimum distance L4.

[0135] The third minimum distance L3 and the fourth minimum distance L4 represent the lengths of the first tab 11B and the second tab 12B that are folded and involved in lamination, respectively. The longer the length of the tab involved in lamination, the greater the degree of tab overlap. The first thickness t1 of the first tab 11B represents the thickness of a single layer of the first tab 11B, and the second thickness t2 of the second tab 12B represents the thickness of a single layer of the second tab 12B. The thicker the single layer of tabs, the thicker the laminated tab structure becomes after lamination.

[0136] In the case of an embodiment of a battery cell 30 in which the first thickness t1 is smaller than the second thickness t2, by making the third minimum distance L3 greater than or equal to the fourth minimum distance L4, the thicknesses of the first tab stacked structure 111 and the second tab stacked structure 121 can be brought closer together, which helps to reduce the risk of the isolation member portion burning out or becoming hot due to the difference in welding heat when forming the weld pool mp.

[0137] In some other embodiments, the first thickness t1 in the thickness direction of the plurality of first tabs 11B is greater than the second thickness t2 in the thickness direction of the plurality of second tabs 12B, and the third minimum distance L3 is less than or equal to the fourth minimum distance L4.

[0138] In the case of an embodiment of a battery cell 30 in which the first thickness t1 is greater than the second thickness t2, by making the third minimum distance L3 less than or equal to the fourth minimum distance L4, the thicknesses of the first tab stacked structure 111 and the second tab stacked structure 121 can be brought closer together, which helps to reduce the risk of the isolation member portion burning out or becoming hot due to the difference in welding heat when forming the weld pool mp.

[0139] In each of the above embodiments, the ratio A / B of the product A of the first thickness t1 in the thickness direction of the plurality of first tabs 11B and the third minimum distance L3, and the product B of the second thickness t2 in the thickness direction of the plurality of second tabs 12B and the fourth minimum distance L4, satisfies 0.2 ≤ A / B ≤ 4, and the units of the first thickness t1, second thickness t2, third minimum distance L3, and fourth minimum distance L4 are the same, for example, all of which are mm or cm.

[0140] The product A of the first thickness t1 and the third minimum distance L3 represents the stacking thickness of the first tab stacking structure 111, and the product B of the second thickness t2 and the fourth minimum distance L4 represents the stacking thickness of the second tab stacking structure 121. The ratio of product A to product B represents the degree of difference in stacking thickness between the first tab stacking structure 111 and the second tab stacking structure 121.

[0141] If the ratio A / B is too large, the first tab laminated structure 111 becomes thicker, requiring the use of high welding power during welding. High welding heat increases the risk of partial burning or overheating of the isolation member corresponding to the first tab laminated structure 111 compared to the second tab laminated structure 121.

[0142] If the ratio A / B is too small, the second tab laminated structure 121 becomes thicker, requiring the use of a high welding power during welding. If the welding heat is high, there is a higher risk of the isolation member corresponding to the second tab laminated structure 121 being partially burned or overheated compared to the first tab laminated structure 111.

[0143] Therefore, by ensuring that the ratio A / B satisfies 0.2 ≤ A / B ≤ 4, the difference in the lamination thickness between the first tab laminated structure 111 and the second tab laminated structure 121 is reduced, thereby decreasing the risk of the isolation member portions corresponding to the first tab laminated structure 111 and the second tab laminated structure 121 burning out or becoming overheated.

[0144] Furthermore, the ratio A / B may satisfy 0.5 ≤ A / B ≤ 2, for example, A / B may be equal to 0.5, 0.8, 1, 1.2, 1.6, or 2.

[0145] By further restricting the ratio A / B to satisfy 0.5 ≤ A / B ≤ 2, the difference in lamination thickness between the first tab laminated structure 111 and the second tab laminated structure 121 is further reduced, thereby effectively decreasing the risk of the isolation member portions corresponding to the first tab laminated structure 111 and the second tab laminated structure 121 burning out or becoming overheated.

[0146] Referring to Figure 13, in some embodiments, the ratio A / B of the product A of the first thickness t1 in the thickness direction of the plurality of first tabs 11B and the third minimum distance L3, and the product B of the second thickness t2 in the thickness direction of the plurality of second tabs 12B and the fourth minimum distance L4, satisfies A / B < 1, and the units of the first thickness t1, second thickness t2, third minimum distance L3, and fourth minimum distance L4 are the same, for example, all of which are mm or cm. Correspondingly, the third thickness t3 of the first conductive member 21 in the first direction d1 is smaller than the fourth thickness t4 of the second conductive member 22 in the first direction d1.

[0147] The product A of the first thickness t1 and the third minimum distance L3 represents the stacking thickness of the first tab stacked structure 111, and the product B of the second thickness t2 and the fourth minimum distance L4 represents the stacking thickness of the second tab stacked structure 121. In the case of a battery cell embodiment where product A is smaller than product B, the second tab stacked structure 121, which has a larger stacking thickness, needs to be welded using a higher welding power. If the higher laser power generates waves, it is more likely that a weld pool that is too deep will form, thereby increasing the risk of the isolation member burning out or overheating.

[0148] Therefore, by using a thicker second conductive member 22, the welding tolerance is increased, reducing the possibility of excessively deep weld pools being formed, thereby lowering the risk of the isolation member portion corresponding to the second tab laminated structure 121 burning out or becoming overheated. Alternatively, a thin first conductive member 21 and a first tab laminated structure 111 with a small laminate thickness can be combined and welded at a low welding power, which in turn makes it easier to form a weld pool of appropriate depth, lowering the risk of the isolation member portion corresponding to the first tab laminated structure 111 burning out or becoming overheated.

[0149] In some other embodiments, the ratio A / B of the product A of the first thickness t1 in the thickness direction of the plurality of first tabs 11B and the third minimum distance L3, and the product B of the second thickness t2 in the thickness direction of the plurality of second tabs 12B and the fourth minimum distance L4, satisfies A / B > 1, and the units of the first thickness t1, second thickness t2, third minimum distance L3, and fourth minimum distance L4 are the same, for example, all of which are mm or cm. Correspondingly, the third thickness t3 of the first conductive member 21 in the first direction d1 is greater than the fourth thickness t4 of the second conductive member 22 in the first direction d1.

[0150] The product A of the first thickness t1 and the third minimum distance L3 represents the stacking thickness of the first tab stacked structure 111, and the product B of the second thickness t2 and the fourth minimum distance L4 represents the stacking thickness of the second tab stacked structure 121. In the case of an embodiment of the battery cell 30 where product B is smaller than product A, the first tab stacked structure 111, which has a larger stacking thickness, needs to be welded using a higher welding power. If the higher laser power generates waves, it is more likely that a weld pool that is too deep will form, thereby increasing the risk of the isolation member burning out or becoming overheated.

[0151] Therefore, by using a thicker first conductive member 21, the welding tolerance is increased, reducing the possibility of excessively deep weld pools being formed, thereby lowering the risk of the isolation member portion corresponding to the first tab laminated structure 111 burning out or becoming overheated. Alternatively, a thin second conductive member 22 and a second tab laminated structure 121 with a small laminate thickness can be combined and welded at a lower welding power, which in turn makes it easier to form a weld pool of appropriate depth, thus lowering the risk of the isolation member portion corresponding to the second tab laminated structure 121 burning out or becoming overheated.

[0152] Referring to Figure 2, based on each embodiment of the battery cell described above, the embodiment of this disclosure provides a battery 40 including the battery cell 30 of any one of the embodiments described above. A battery using the battery cell can effectively improve safety in use.

[0153] Based on each embodiment of the battery cell, and with reference to Figure 1, the embodiments of this disclosure provide a power consumption device including a battery 40 of any one of the embodiments described above. The power consumption device using the battery can effectively improve safety of use.

[0154] In some specific embodiments, as shown in Figures 5 to 7 and Figure 11, for example, the battery cell 30 is cylindrical and includes an electrode assembly 10, a first conductive member 21, a second conductive member 22, an outer case 31, and electrode terminals 32. The outer case 31 has a cavity that houses the electrode assembly 10, the first conductive member 21, and the second conductive member 22. The outer case 31 may include a housing 311 and an end cover 312. One end of the housing 311 has an opening 311A, and the end cover 312 covers the opening 311A. The housing 311 includes a side wall 311B and a bottom wall 311C. The side wall 311B surrounds the outside of the electrode assembly 10, and the bottom wall 311C is installed opposite the opening 311A. A through hole 311D is provided in the bottom wall 311C. The electrode terminal 32 is installed in the through hole 311D via the electrode lead-out portion 34 and the first insulating member 33.

[0155] The battery cell 30 includes an electrode assembly 10, a first conductive member 21, and a second conductive member 22. The electrode assembly 10 includes a first polarity sheet 11, a second polarity sheet 12, and a separator member 13, the polarities of the first polarity sheet 11 and the second polarity sheet 12 being opposite, the separator member 13 being located between the first polarity sheet 11 and the second polarity sheet 12, and the first polarity sheet 11, the second polarity sheet 12, and the separator member 13 being wound along the winding direction wd to form a cylindrical wound structure 100. The separator member 13 is in the form of a separator and is installed between the first polarity sheet 11 and the second polarity sheet 12.

[0156] The first polarity sheet 11 includes a first current collector substrate 11A and a plurality of first tabs 11B, the plurality of first tabs 11B being connected to the first current collector substrate 11A and spaced apart along the winding direction wd, and at least a portion of the plurality of first tabs 11B being bent at the ends of the winding structure 100 to form a first tab stacked structure 111.

[0157] The second polar sheet 12 includes a second current collector substrate 12A and a plurality of second tabs 12B, the plurality of second tabs 12B being connected to the second current collector substrate 12A and spaced apart along the winding direction wd, and at least a portion of the plurality of second tabs 12B being bent at the ends of the winding structure 100 to form a second tab laminated structure 121.

[0158] The first conductive member 21 is welded to the first tab stacked structure 111 and to the electrode lead-out portion 34, thereby achieving electrical connection with the electrode terminal 32. The second conductive member 22 is welded to the second tab stacked structure 121 and to the end cover 312.

[0159] In the first direction d1, the first tab stacking structure 111 and the second tab stacking structure 121 are located at opposite ends of the winding structure 100, respectively. The first conductive member 21 and the second conductive member 22 are located on both sides of the electrode assembly 10 along the first direction d1.

[0160] The first polarity sheet 11 is a positive electrode sheet, and the material of the first tab 11B obtained by cutting the portion of the first current collector substrate 11A and the portion of the first current collector substrate 11A not covered by the first active material layer 11C is metallic aluminum. The second polarity sheet 12 is a negative electrode sheet, and the material of the second tab 12B obtained by cutting the portion of the second current collector substrate 12A and the portion of the second current collector substrate 12A not covered by the second active material layer 12C is metallic copper.

[0161] The melting point of metallic aluminum is lower than that of metallic copper, as shown in Figure 11. The first minimum distance L1 is smaller than the second minimum distance L2. The second thickness t2 of the second tab 12B is larger than the first thickness t1 of the first tab 11B, and the third minimum distance L3 is larger than the fourth minimum distance L4.

[0162] While this disclosure has been described with reference to preferred embodiments, various improvements and substitutions of components with equivalents can be made without departing from the scope of this disclosure. In particular, each technical feature mentioned in each embodiment can be combined in any way, provided that there is no structural inconsistency. This disclosure is not limited to the specific embodiments disclosed herein and includes all technical solutions included in the claims.

Claims

1. An electrode assembly (10) comprising a first polar sheet (11), a second polar sheet (12), and an isolation member (13), wherein the polarities of the first polar sheet (11) and the second polar sheet (12) are opposite, the isolation member (13) is located between the first polar sheet (11) and the second polar sheet (12), the first polar sheet (11), the second polar sheet (12), and the isolation member (13) are wound along a winding direction (wd) to form a wound structure (100), the first polar sheet (11) includes a plurality of first tabs (11B) that are bent at the end of the wound structure (100) to form a first tab stacked structure (111), and the second polar sheet (12) includes a plurality of second tabs (12B) that are bent at the end of the wound structure (100) to form a second tab stacked structure (121), A first conductive member (21) is welded to the first tab stacked structure (111), The second tab laminated structure (121) includes a second conductive member (22) welded to it, In a first direction (d1) parallel to the extension direction of the winding axis of the winding structure (100), at least one of the bending positions (11f) of the plurality of first tabs (11B) and the bending positions (12f) of the plurality of second tabs (12B) has a gap between it and the isolation member (13) in the first direction (d1). In the first direction (d1), the minimum distance of the gap between the folded position (11f) of the plurality of first tabs (11B) and the separating member (13) is defined as the first minimum distance (L1), and in the first direction (d1), the minimum distance of the gap between the folded position (12f) of the plurality of second tabs (12B) and the separating member (13) is defined as the second minimum distance (L2), A battery cell (30) wherein the melting point of the material of the plurality of first tabs (11B) is lower than the melting point of the material of the plurality of second tabs (12B), and the first minimum distance (L1) is less than or equal to the second minimum distance (L2), or the melting point of the material of the plurality of first tabs (11B) is higher than the melting point of the material of the plurality of second tabs (12B), and the second minimum distance (L2) is less than or equal to the first minimum distance (L1).

2. The battery cell (30) according to claim 1, wherein the bending position (11f) of the plurality of first tabs (11B) is the cutting base (11r) of the plurality of first tabs (11B), and / or the bending position (12f) of the plurality of second tabs (12B) is the cutting base (12r) of the plurality of second tabs (12B).

3. In the first direction (d1), there is a third minimum distance (L3) between the folding position (11f) of the plurality of first tabs (11B) and the upper part (11t) of the plurality of first tabs (11B), and there is a fourth minimum distance (L4) between the folding position (12f) of the plurality of second tabs (12B) and the upper part (12t) of the plurality of second tabs (12B), The battery cell (30) according to claim 1, wherein the first thickness (t1) of the plurality of first tabs (11B) in the thickness direction of the first tab (11B) is smaller than the second thickness (t2) of the plurality of second tabs (12B) in the thickness direction of the second tab (12B), and the third minimum distance (L3) is greater than or equal to the fourth minimum distance (L4).

4. In the first direction (d1), there is a third minimum distance (L3) between the folding position (11f) of the plurality of first tabs (11B) and the upper part (11t) of the plurality of first tabs (11B), and there is a fourth minimum distance (L4) between the folding position (12f) of the plurality of second tabs (12B) and the upper part (12t) of the plurality of second tabs (12B), The battery cell (30) according to claim 1, wherein the first thickness (t1) of the plurality of first tabs (11B) in the thickness direction of the first tab (11B) is greater than the second thickness (t2) of the plurality of second tabs (12B) in the thickness direction of the second tab (12B), and the third minimum distance (L3) is less than or equal to the fourth minimum distance (L4).

5. The battery cell (30) according to claim 3, wherein the ratio A / B of the product A of the first thickness (t1) in the thickness direction of the plurality of first tabs (11B) and the third minimum distance (L3) of the plurality of first tabs (11B) and the product B of the second thickness (t2) in the thickness direction of the plurality of second tabs (12B) and the fourth minimum distance (L4) of the plurality of second tabs (12B) satisfies 0.2 ≤ A / B ≤ 4, provided that the units of the first thickness (t1), second thickness (t2), third minimum distance (L3), and fourth minimum distance (L4) are the same.

6. The battery cell (30) according to claim 5, wherein the ratio A / B satisfies 0.5 ≤ A / B ≤ 2.

7. The battery cell (30) according to claim 3, wherein the ratio A / B of the product A of the first thickness (t1) in the thickness direction of the plurality of first tabs (11B) and the third minimum distance (L3) of the plurality of first tabs (11B) and the product B of the second thickness (t2) in the thickness direction of the plurality of second tabs (12B) and the fourth minimum distance (L4) of the plurality of second tabs (12B) satisfies A / B < 1, where the units of the first thickness (t1), second thickness (t2), third minimum distance (L3), and fourth minimum distance (L4) are the same, and the third thickness (t3) of the first conductive member (21) in the first direction (d1) is smaller than the fourth thickness (t4) of the second conductive member (22) in the first direction (d1).

8. The battery cell (30) according to claim 3, wherein the ratio A / B of the product A of the first thickness (t1) in the thickness direction of the plurality of first tabs (11B) and the third minimum distance (L3) of the plurality of first tabs (11B) and the product B of the second thickness (t2) in the thickness direction of the plurality of second tabs (12B) and the fourth minimum distance (L4) of the plurality of second tabs (12B) satisfies A / B > 1, where the units of the first thickness (t1), second thickness (t2), third minimum distance (L3), and fourth minimum distance (L4) are the same, and the third thickness (t3) of the first conductive member (21) in the first direction (d1) is greater than the fourth thickness (t4) of the second conductive member (22) in the first direction (d1).

9. The battery cell (30) according to claim 1, wherein in the first direction (d1), the first tab stacking structure (111) and the second tab stacking structure (121) are both located at the same end of the wound structure (100).

10. The battery cell (30) according to claim 1, wherein in the first direction (d1), the first tab stacking structure (111) and the second tab stacking structure (121) are both located at opposing ends of the wound structure (100).

11. The electrode assembly (10), the first conductive member (21), and the second conductive member (22) are housed in an outer case (31) having a cavity. The battery cell (30) according to claim 1, further comprising an electrode terminal (32) installed on the wall of the outer case (31) and electrically connected to the first conductive member (21) or the second conductive member (22).

12. The battery cell (30) according to claim 11, wherein the outer case (31) includes a housing (311) and an end cover (312), one end of the housing (311) has an opening (311A), the end cover (312) covers the opening (311A), the housing (311) includes a side wall (311B) and a bottom wall (311C), the side wall (311B) surrounds the outside of the electrode assembly (10), the bottom wall (311C) is installed opposite the opening (311A), and the wall portion of the outer case (31) is the end cover (312) or the bottom wall (311C).

13. The first polarity sheet (11) further includes a first current collector substrate (11A), the plurality of first tabs (11B) are connected to the first current collector substrate (11A) and are spaced apart along the winding direction (wd), and in the first direction (d1), the bent positions (11f) of the plurality of first tabs (11B) are located on the side of the isolation member (13). The battery cell (30) according to claim 1, wherein the second polarity sheet (12) further includes a second current collector substrate (12A), the plurality of second tabs (12B) are connected to the second current collector substrate (12A) and are spaced apart along the winding direction (wd), and in the first direction (d1), the bent positions (12f) of the plurality of second tabs (12B) are located on the side of the isolation member (13).

14. A battery (40) comprising a battery cell (30) according to any one of claims 1 to 13.

15. A power consumption device including the battery (40) according to claim 14.

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