Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment, and belongs to the technical field of batteries. The battery cell includes: a first end cap assembly including a first electrode terminal; the electrode assembly comprises a main body part and a tab extending out of the main body part; an isolation member at least partially disposed between the first electrode terminal and the main body portion; wherein the first end cover assembly is provided with a first clamping structure, the isolation component is provided with a second clamping structure, one of the first clamping structure and the second clamping structure is provided with a buckling part, the other one of the first clamping structure and the second clamping structure is provided with a clamping groove part, the buckling part is clamped with the clamping groove part, the buckling part is provided with a first clamping surface, and the clamping groove part is provided with a second clamping surface. The sizes of the first clamping surface and the second clamping surface in the first direction are smaller than those in the second direction, the first direction is the length direction of the isolation component, and the second direction is the width direction of the isolation component. According to the technical scheme, the reliability of the single battery is improved.

Description

TECHNICAL FIELD

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

[0002] With the increasing environmental pollution, new energy industry is attracting more and more attention. In the new energy industry, battery technology is an important factor for its development.

[0003] The development of battery technology needs to consider many design factors, such as energy density, cycle life, reliability, etc., among which the structure of the battery monomer is crucial to the reliability of the battery. Therefore, how to provide a battery monomer to improve the reliability of the battery is an urgent technical problem to be solved. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery monomer, a battery device and an electric equipment, which can improve the reliability of the battery monomer.

[0005] In a first aspect, a battery monomer is provided, comprising: a first end cover assembly comprising a first electrode terminal; an electrode assembly accommodated in the shell, the electrode assembly comprising a main body portion and a tab extending from the main body portion; an isolation member at least partially disposed between the first electrode terminal and the main body portion; wherein the first end cover assembly is provided with a first clamping structure, the isolation member is provided with a second clamping structure, one of the first clamping structure and the second clamping structure has a clamping portion, and the other has a clamping groove portion, the clamping portion and the clamping groove portion are clamped, the clamping portion has a first clamping surface, the clamping groove portion has a second clamping surface, the first clamping surface and the second clamping surface have a size along a first direction smaller than a size along a second direction, the first direction is a length direction of the isolation member, and the second direction is a width direction of the isolation member.

[0006] In the embodiment of the present application, the isolation member is at least partially arranged between the first electrode terminal and the main body portion, so that at least part of the tab can be isolated from the main body portion of the electrode assembly, thereby reducing the risk of the tab being inserted into the main body portion and the risk of short circuit of the battery cell when the battery cell is impacted or the like. The first clamping structure of the first end cover assembly and the second clamping structure of the isolation member are clamped, one of the first clamping structure and the second clamping structure has a buckle portion, and the other has a clamping groove portion, the buckle portion and the clamping groove portion are clamped, thereby realizing the fixation between the first end cover assembly and the isolation member. The buckle portion has a first clamping surface, and the clamping groove portion has a second clamping surface, the size of the first clamping surface and the second clamping surface along the first direction is smaller than the size along the second direction, so that the area of the overlapping region between the buckle portion and the clamping groove portion can be increased, the risk of the buckle portion being separated from the clamping groove portion can be reduced, and the connection strength between the buckle portion and the clamping groove portion can be increased, thereby the risk of the isolation member moving in the battery cell can be reduced, and the risk of the tab being pulled and torn can be reduced. Therefore, the technical scheme of the embodiment of the present application is beneficial to improve the reliability of the battery cell.

[0007] In some embodiments, the first clamping structure is a protruding structure protruding towards the electrode assembly along a third direction, the protruding structure includes the buckle portion, and the second clamping structure is an opening structure corresponding to the protruding structure, the opening structure includes the clamping groove portion. In this way, the buckle portion of the protruding structure is clamped into the clamping groove portion of the opening structure, thereby realizing the connection between the first end cover assembly and the isolation member; in addition, the first clamping structure is a protruding structure, and the second clamping structure is an opening structure, which is beneficial to the processing of the first end cover assembly and the isolation member.

[0008] In some embodiments, the first clamping surface has a first profile including a first straight line segment extending along the second direction, and the second clamping surface has a second profile including a third straight line segment extending along the second direction, and the first profile and the second profile are perpendicular to the third direction.

[0009] In the above technical scheme, the first straight line segment and the third straight line segment extend along the second direction, which is beneficial to the processing of the buckle portion and the clamping groove portion, and is also beneficial to increasing the area of the overlapping region between the buckle portion and the clamping groove portion and improving the connection strength between the first end cover assembly and the isolation member.

[0010] In some embodiments, the length L1 of the first straight line segment satisfies: 0.5mm≤L1≤5mm, and / or the length L2 of the third straight line segment satisfies: 0.5mm≤L2≤5mm. In this way, L1 and L2 have a suitable size, the overlapping area between the first clamping surface of the buckle portion and the second clamping surface of the clamping groove portion has a larger area, the connection strength between the first end cover assembly and the isolation member is larger, which is beneficial to reduce the risk of movement of the isolation member in the battery monomer and tearing of the tab, and the buckle portion and the clamping groove portion have higher structural strength, and the battery monomer has higher reliability.

[0011] In some embodiments, 2mm≤L1≤4mm, and / or 2mm≤L2≤4mm. In this way, the buckle portion and the clamping groove portion have higher connection strength, and the buckle portion and the clamping groove portion have higher structural strength, and the battery monomer has higher reliability.

[0012] In some embodiments, the first profile includes a first arc segment and a second arc segment, and the first arc segment and the second arc segment are respectively connected to two ends of the first straight line segment. In this way, it is convenient for the buckle portion to enter the clamping groove portion.

[0013] In some embodiments, the radius R1 of the first arc segment and the second arc segment satisfies: 0.3mm≤R1≤2.5mm. In this way, the first arc segment and the second arc segment have a suitable size, which is convenient for processing of the buckle portion and smooth entry of the buckle portion into the clamping groove portion.

[0014] In some embodiments, 1.0mm≤R1≤2.1mm. In this way, the first arc segment and the second arc segment have a suitable size, which is convenient for processing of the buckle portion and smooth entry of the buckle portion into the clamping groove portion.

[0015] In some embodiments, the first profile includes a second straight line segment, the second straight line segment is parallel to the first direction, and two ends of the first arc segment are respectively connected to the first straight line segment and the second straight line segment. In this way, the area of the overlapping area between the clamping groove portion of the opening structure and the buckle portion of the protruding structure is larger, and the protruding structure is not easy to come out of the opening structure.

[0016] In some embodiments, the second profile includes a third arc segment and a fourth arc segment, and the third arc segment and the fourth arc segment are respectively connected to two ends of the third straight line segment. In this way, it is convenient for the buckle portion to enter the clamping groove portion.

[0017] In some embodiments, the radius R2 of the third arc segment and the fourth arc segment satisfies: 0.5mm≤R2≤2.7mm. In this way, the third arc segment and the fourth arc segment have a suitable size, which is convenient for processing of the clamping groove portion and smooth entry of the buckle portion into the clamping groove portion. In some embodiments, the first profile includes a first arc segment and a second arc segment, and the first arc segment and the second arc segment are respectively connected to two ends of the first straight line segment. In this way, it is convenient for the buckle portion to enter the clamping groove portion.

[0013] In some embodiments, the radius R1 of the first arc segment and the second arc segment satisfies: 0.3mm≤R1≤2.5mm. In this way, the first arc segment and the second arc segment have a suitable size, which is convenient for processing of the buckle portion and smooth entry of the buckle portion into the clamping groove portion.

[0014] In some embodiments, 1.0mm≤R1≤2.1mm. In this way, the first arc segment and the second arc segment have a suitable size, which is convenient for processing of the buckle portion and smooth entry of the buckle portion into the clamping groove portion.

[0015] In some embodiments, the first profile includes a second straight line segment, the second straight line segment is parallel to the first direction, and two ends of the first arc segment are respectively connected to the first straight line segment and the second straight line segment. In this way, the area of the overlapping area between the clamping groove portion of the opening structure and the buckle portion of the protruding structure is larger, and the protruding structure is not easy to come out of the opening structure.

[0016] In some embodiments, the second profile includes a third arc segment and a fourth arc segment, and the third arc segment and the fourth arc segment are respectively connected to two ends of the third straight line segment. In this way, it is convenient for the buckle portion to enter the clamping groove portion.

[0017] In some embodiments, the radius R2 of the third arc segment and the fourth arc segment satisfies: 0.5mm≤R2≤2.7mm. In this way, the third arc segment and the fourth arc segment have a suitable size, which is convenient for processing of the clamping groove portion and smooth entry of the buckle portion into the clamping groove portion.

[0018] In some embodiments, 1.2mm≤R2≤2.3mm. In this way, the third arc segment and the fourth arc segment have a suitable size, facilitating the processing of the clamping groove portion and the smooth entry of the clamping portion into the clamping groove portion.

[0019] In some embodiments, along the first direction, the size L3 of the overlapping area of the clamping portion and the clamping groove portion satisfies: 0.15mm≤L3≤0.5mm, the first direction being the length direction of the isolation member. In this way, the overlapping area between the clamping portion and the clamping groove portion has a larger area, the connection strength between the first end cover assembly and the isolation member is larger, the risk of the isolation member moving in the battery monomer and the risk of the tab tearing are lower, and the battery monomer has higher reliability.

[0020] In some embodiments, 0.2mm≤L3≤0.4mm. In this way, the overlapping area between the clamping portion and the clamping groove portion has a larger area, the connection strength between the first end cover assembly and the isolation member is larger, the risk of the isolation member moving in the battery monomer and the risk of the tab tearing are lower, and the battery monomer has higher reliability.

[0021] In some embodiments, the protruding structure includes a clamping portion, a connecting portion, and a transition portion, the two ends of the connecting portion along the third direction are respectively connected with the transition portion and the clamping portion; the opening structure includes the clamping groove portion, a limiting portion, and a guide portion, the two ends of the limiting portion along the third direction are respectively connected with the guide portion and the clamping groove portion.

[0022] In the above technical solution, the guide portion can guide the protruding structure to enter the opening structure, and the limiting portion can limit the movement of the clamping portion along the third direction after the clamping portion of the protruding structure enters the clamping groove portion, thereby reducing the risk of the clamping portion separating from the clamping groove portion.

[0023] In some embodiments, along the first direction, the size D1 of the limiting portion, the size D2 of the connecting portion, and the size D3 of the clamping portion satisfy: D2<D1<D3.

[0024] In the above technical solution, the movement of the clamping portion along the third direction can be limited after the clamping portion of the protruding structure enters the clamping groove portion, thereby reducing the risk of the clamping portion separating from the clamping groove portion, and the connecting portion can pass through the limiting portion and at least partially enter the clamping groove portion.

[0025] In some embodiments, 0.05mm≤D1-D2≤1mm. In this way, the limiting portion of the opening structure and the connecting portion of the protruding structure have a suitable size, which can make the connecting portion pass through the limiting portion and at least partially enter the clamping groove portion, and can reduce the risk of the clamping portion separating from the clamping groove portion.

[0026] In some embodiments, 0.4mm≤D1-D2≤0.6mm. In this way, the limiting portion of the opening structure and the connecting portion of the protruding structure have appropriate sizes, which can enable the connecting portion to enter the clamping groove portion through the limiting portion, and can reduce the risk of the clamping portion coming out of the clamping groove portion.

[0027] In some embodiments, the protruding structure comprises a deformation groove, the deformation groove penetrating through the clamping portion and at least part of the connecting portion along the third direction, and a width direction of the deformation groove being perpendicular to the second direction. In this way, the clamping portion and the connecting portion can be deformed along the first direction, which facilitates the clamping portion to be clamped into the clamping groove portion.

[0028] In some embodiments, along the first direction, a size D4 of the deformation groove satisfies: 0.3mm≤D4≤1.5mm. In this way, the deformation groove has appropriate sizes in the first direction, which facilitates the clamping portion to enter the clamping groove portion during assembly of the first end cover assembly and the isolation member, and the protruding structure has appropriate strength, which is conducive to assembly of the battery monomer and improvement of reliability of the battery monomer.

[0029] In some embodiments, 0.7mm≤D4≤1.1mm. In this way, the deformation groove has appropriate sizes in the first direction, which facilitates the clamping portion to be smoothly clamped into the clamping groove portion while the strength of the protruding structure is taken into account, which is conducive to assembly of the battery monomer and improvement of reliability of the battery monomer.

[0030] In some embodiments, the first end cover assembly is provided with two first clamping structures, and the two first clamping structures are respectively arranged at end regions of the first end cover assembly along the first direction; and the isolation member is provided with two second clamping structures, and the two second clamping structures are respectively arranged at end regions of the isolation member along the first direction.

[0031] In the above technical solution, the two first clamping structures and the two second clamping structures are arranged, which is conducive to increasing the connection strength between the first end cover assembly and the isolation member. In addition, the second clamping structure is arranged at the end region of the isolation member along the first direction, which facilitates the channel for the tab to pass through to be arranged at the middle region of the isolation member, so as to facilitate the tab to be electrically connected with the first electrode terminal.

[0032] In some embodiments, the isolation member is provided with a channel, the channel is arranged at a middle region of the isolation member along the first direction, and the tab passes through the channel and is electrically connected with the first electrode terminal.

[0033] In the above technical solution, the channel is arranged at the middle region of the isolation member along the first direction, and the channel corresponds to the tab, which facilitates the tab to pass through the channel and be electrically connected with the first electrode terminal.

[0034] In some embodiments, the first end cover assembly includes an end cover and an insulating piece, the end cover is configured to cover the first opening, and the insulating piece is provided with the first clamping structure.

[0035] In the technical solution described above, the end cover covers the first opening of the shell, and the first electrode terminal on the end cover is electrically connected with the tab, and the first clamping structure of the insulating piece is clamped with the second clamping structure of the isolation member. By providing the first end cover assembly, the connection of the first end cover assembly, the isolation member and the electrode assembly is facilitated.

[0036] In a second aspect, a battery device is provided, which includes the battery cell of the first aspect or any one of the embodiments of the first aspect.

[0037] In a third aspect, a use electric device is provided, which includes the battery device of the second aspect.

[0038] In the embodiments of the present application, the isolation member is at least partially arranged between the first electrode terminal and the main body part, so that at least part of the tab can be isolated from the main body part of the electrode assembly, thereby reducing the risk of the tab being inserted into the main body part and the risk of short circuit of the battery cell when the battery cell is impacted or the like. The first clamping structure of the first end cover assembly is clamped with the second clamping structure of the isolation member, one of the first clamping structure and the second clamping structure has a clamping portion, and the other has a clamping groove portion, the clamping portion is clamped with the clamping groove portion, thereby realizing the fixation between the first end cover assembly and the isolation member. The clamping portion has a first clamping surface, and the clamping groove portion has a second clamping surface, the size of the first clamping surface and the second clamping surface along the first direction is smaller than the size along the second direction, so that the area of the overlapping region between the clamping portion and the clamping groove portion can be increased, the risk of the clamping portion being separated from the clamping groove portion can be reduced, and the connection strength between the clamping portion and the clamping groove portion can be increased, thereby reducing the risk of the isolation member moving in the battery cell, and further reducing the risk of the tab being pulled and torn. Therefore, the technical solution of the embodiments of the present application is beneficial to improve the reliability of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A schematic view of a vehicle according to an embodiment of the present application;

[0040] Figure 2 A structural schematic view of a battery device according to an embodiment of the present application;

[0041] Figure 3 A structural schematic view of a battery cell according to an embodiment of the present application;

[0042] Figure 4 An exploded structural schematic view of a battery cell according to an embodiment of the present application;

[0043] Figure 5A top view of a battery cell according to an embodiment of the present application;

[0044] Figure 6 for Figure 5 A cross-sectional view of the battery cell along the AA direction;

[0045] Figure 7 for Figure 6 An enlarged schematic diagram of region C in FIG;

[0046] Figure 8 for Figure 7 A cross-sectional view of the battery cell along the BB direction;

[0047] Figure 9 for Figure 8 An enlarged schematic diagram of region D in FIG.

[0048] Figure 10 A schematic diagram of a first outline of an embodiment of the present application;

[0049] Figure 11 A schematic diagram of a second outline of an embodiment of the present application;

[0050] Figure 12 This is a schematic structural diagram of a first end cover assembly according to an embodiment of the present application;

[0051] Figure 13 for Figure 12 An enlarged schematic diagram of region E in FIG;

[0052] Figure 14 This is a schematic structural diagram of an isolation component according to an embodiment of the present application;

[0053] Figure 15 A top view of an isolation member according to an embodiment of the present application;

[0054] Figure 16 A schematic diagram of a protruding structure according to an embodiment of the present application;

[0055] Figure 17 FIG. 1 is a schematic diagram of an opening structure according to an embodiment of the present application.

[0056] In the drawings, the drawings are not drawn to scale.

[0057] Reference numerals:

[0058] 1: Vehicle; 10: Battery device; 30: Controller; 40: Motor;

[0059] 20: Battery cell; 11: Box; 111: First box portion; 112: Second box portion;

[0060] 21: housing; 22: electrode assembly; 23: isolation member; 24: first end cap assembly; 25: second end cap assembly; 230: side wall; 2301: first side wall; 2302: second side wall; 231: isolation plate; 232: reinforcing structure; 237: through hole; 2330: channel; 26: insulation film; 27: side support plate;

[0061] 211: first opening; 212: second opening; 240: first electrode terminal; 251: second electrode terminal; 221: main body portion; 222: tab; 241: end cap; 242: insulator; 5: first clamping structure; 6: second clamping structure;

[0062] 50: protruding structure; 501: clamping portion; 502: connecting portion; 503: transition portion; 504: deformation groove; 505: first fixing portion;

[0063] 60: opening structure; 601: clamping groove portion; 602: limiting portion; 603: guide portion; 604: second fixing portion;

[0064] 80: first profile; 81: first straight line segment; 82: first arc line segment; 83: second arc line segment; 84: second straight line segment;

[0065] 90: first profile; 91: third straight line segment; 92: third arc line segment; 93: fourth arc line segment. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0067] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing the particular embodiments only and is not intended to be limiting of the application; the use of the terms "including", "comprising" and "having" in the specification herein are meant to encompass the inclusion of one or more elements, not the exclusion of any other elements; the use of the terms "first", "second", and the like in the specification herein is intended to distinguish between similar objects, not to designate a particular order or priority of importance.

[0069] Reference within this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0070] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0071] The term "and / or" in this application is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0072] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0073] "Multiple" appearing in this application means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0074] If not specifically stated, all embodiments and optional embodiments of the application can be combined with each other to form new technical solutions.

[0075] If not specifically stated, all technical features and optional technical features of the application can be combined with each other to form new technical solutions.

[0076] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, it is mentioned that the method may also include step (c), which means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0077] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0078] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0079] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator, which is positioned between the positive and negative electrodes. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are intercalated and released between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0080] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0081] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0082] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal may be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0083] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04 (which can also be referred to simply as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be referred to simply as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to simply as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to simply as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to simply as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to simply as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2), and modified compounds thereof, etc. The modified compound refers to a substance obtained by a modification means such as doping or coating on the basis of the above-mentioned substance.

[0084] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or a foam carbon, etc. When the foam metal is used as the positive electrode, the foam metal surface can not be provided with the positive electrode active material, or of course, the positive electrode active material can be provided. As an example, the positive electrode active material is filled or / and deposited in the foam metal.

[0085] In some embodiments, the negative electrode can be a negative electrode tab, and the negative electrode tab can include a negative electrode current collector.

[0086] As an example, the negative current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0087] As an example, the negative electrode tab can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0088] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0089] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery cell can also be used. These negative active materials can be used alone only one or in combination of two or more.

[0090] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as a negative electrode tab, the surface of the foamed metal can not be provided with a negative active material, and of course, can be provided with a negative active material.

[0091] As an example, the negative active material can be filled or / and deposited in the negative current collector.

[0092] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0093] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0094] In some embodiments, the separator is a separator film. The type of separator film is not particularly limited in the present application, and any known porous separator film having good chemical stability and mechanical stability can be used.

[0095] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can be applied to the surface of the separator film.

[0096] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0097] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0098] The liquid electrolyte includes an electrolyte salt and a solvent.

[0099] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro oxalate borate, lithium di-oxalate borate, lithium difluoro di-oxalate phosphate, and lithium tetrafluoro oxalate phosphate.

[0100] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl 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, butanedisulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether-based solvent. The ether-based solvent can 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, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0101] In some embodiments, the electrolyte can also optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, and an additive capable of improving certain performance of the battery cell, such as an additive capable of improving overcharge / fast charge performance of the battery cell, an additive capable of improving high-temperature performance of the battery cell, an additive capable of improving low-temperature performance of the battery cell, and the like.

[0102] In some embodiments, the gel-state electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0103] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0104] As an example, the polymer of the polymer solid-state electrolyte can include a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, and the like.

[0105] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0106] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0107] The technical solutions described in the embodiments of the present application are applicable to various power battery using devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0108] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of hydraulic, thermal, wind and solar power station, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, and electric transportation tools, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0109] The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, reliability, etc., among which the structure of the battery cell is crucial to the performance of the battery cell. The battery cell includes an electrode assembly, an end cover assembly, a separation member, and a housing, wherein the housing is used to accommodate the electrode assembly, the end cover assembly is used to cover the housing, and the separation member is at least partially arranged between the tab and the electrode assembly to facilitate the connection of the tab and the electrode terminal of the end cover assembly. During the use or transportation of the battery cell, when the battery cell is subjected to impact, extrusion, vibration, etc., the separation member is prone to move, thereby affecting the support effect on the tab and being not conducive to the improvement of the reliability of the battery cell.

[0110] In some processing modes, a first clamping structure is arranged on the end cover assembly, a second clamping structure is arranged on the separation member, and the first clamping structure and the second clamping structure are clamped to achieve fixed connection between the end cover assembly and the separation member. However, the area of the overlapping region between the first clamping structure and the second clamping structure is small, the first clamping structure is prone to be separated from the second clamping structure, the separation member is at high risk of moving in the battery cell, and the tab is at risk of tearing, which is not conducive to the improvement of the reliability of the battery cell.

[0111] Therefore, the present application provides a battery cell, which includes a first end cover assembly and a separation member, the first end cover assembly is provided with a first clamping structure, the separation member is provided with a second clamping structure, one of the first clamping structure and the second clamping structure has a clasp part, and the other has a clamping groove part, the clasp part and the clamping groove part are clamped, the clasp part has a first clamping surface, the clamping groove part has a second clamping surface, the size of the first clamping surface and the second clamping surface along a first direction is smaller than the size along a second direction, the first direction is the length direction of the separation member, and the second direction is the width direction of the separation member. In this way, compared with the case that the first clamping surface and the second clamping surface are the same in the first direction and the second direction, for example, the profiles of the first clamping surface and the second clamping surface are circular, the area of the overlapping region of the second clamping surface and the second clamping surface is larger, the risk of the clasp part being separated from the clamping groove part is lower, the connection strength between the first end cover assembly and the separation member is larger, the separation member is not prone to move and the risk of the tab tearing is lower, and the battery cell has higher reliability.

[0112] The technical solutions described in the embodiments of the present application are applicable to various electric equipment using battery devices.

[0113] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0114] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0115] Figure 1 This is a schematic diagram of the structure of a vehicle according to an embodiment of the present application. Figure 1 As shown, the vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery device 10 can be provided inside the vehicle 1, and the controller 30 is used to control the battery device 10 to power the motor 40. For example, a battery device 10 can be provided at the bottom, front or rear of the vehicle 1. The battery device 10 can be used to power the vehicle 1, for example, the battery device 10 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements of the vehicle 1 during startup, navigation and operation. In another embodiment of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0116] Figure 2 This is a schematic diagram of the structure of a battery device according to an embodiment of the present application. Figure 2 As shown, the battery device 10 of the embodiment of the present application may include a plurality of battery cells 20 to meet different power requirements. The shape of the battery cell 20 of the embodiment of the present application can be set according to the actual application. For example, the battery cell 20 can be as follows Figure 2 The rectangular parallelepiped shown, or it can be different from Figure 2 The cylindrical or other shapes shown are not limited to these embodiments of the present application.

[0117] It should be understood that Figure 2As shown, the battery device 10 of the embodiment of the present application may further include a box body 11, which may be used to accommodate a plurality of battery cells 20. The interior of the box body 11 of the embodiment of the present application is a hollow structure, and a plurality of battery cells 20 are accommodated in the box body 11. The box body 11 may include two parts, which are respectively referred to as a first box body part 111 and a second box body part 112, and the first box body part 111 and the second box body part 112 are buckled together. The shapes of the first box body part 111 and the second box body part 112 may be determined according to the shapes of the components accommodated therein. For example, they may be determined according to the shape of the combination of the plurality of battery cells 20 accommodated therein, and at least one of the first box body part 111 and the second box body part 112 may have an opening. For example, as Figure 2 As shown, the first box portion 111 and the second box portion 112 can both be hollow rectangular parallelepipeds, each with one open face. The opening of the first box portion 111 and the opening of the second box portion 112 are arranged opposite each other, and the first box portion 111 and the second box portion 112 are interlocked to form a box 11 having a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and then placed in the box 11 formed by the interlocking of the first box portion 111 and the second box portion 112.

[0118] For example, unlike Figure 2 As shown, only one of the first and second housing portions 111, 112 may be a hollow rectangular parallelepiped with an opening, while the other may be a plate-shaped structure to cover the opening. For example, if the second housing portion 112 is a hollow rectangular parallelepiped structure with an opening and the first housing portion 111 is a plate-shaped structure, the first housing portion 111 covers the opening of the second housing portion 112 to form the housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0119] Figure 3 This is a schematic structural diagram of a battery cell according to an embodiment of the present application. Figure 4 This is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application. Figure 5 This is a top view of a battery cell according to an embodiment of the present application. Figure 6 for Figure 5 The cross-section of the battery cell along the AA direction, Figure 7 for Figure 6 An enlarged schematic diagram of region C in FIG. Figure 8 for Figure 7 The cross-section of the battery cell along the BB direction, Figure 9 for Figure 8 An enlarged schematic diagram of area D in FIG.

[0120] The present application embodiment provides a battery cell 20, for example, referring to Figures 3 to 9As shown, the battery cell includes a first end cover assembly 24, an electrode assembly 22, and a separator member 23.

[0121] The battery cell 20 can further include a housing 21 having a first opening 211, and the first end cover assembly 24 is configured to cover the first opening 211.

[0122] The housing 21 can be a hollow structure having an opening on one side, or a hollow structure having openings on both sides. For example, the housing 21 is provided with one opening, which is the first opening 211. For another example, the housing 21 can be further provided with an opening in addition to the first opening 211.

[0123] The housing 21 is configured to accommodate the electrode assembly 22, and the shape of the housing 21 can be determined according to the shape of the one or more electrode assemblies 22 combined, for example, as shown in Figure 4 As shown, the housing 21 is a hollow cuboid. Embodiments of the present application include but are not limited to this, and the housing 21 can also be a hollow cube, a hollow cylinder, or other shapes.

[0124] The material of the housing 21 can be various, such as steel shell, aluminum shell, plastic shell (such as polypropylene), composite metal shell (such as copper-aluminum composite shell), or aluminum plastic film, etc.

[0125] The first end cover assembly 24 includes a first electrode terminal 240, which is configured to electrically connect the electrode assembly 22 with the circuit outside the battery cell 20 to realize the charging and discharging of the electrode assembly 22. As an example, at least part of the first electrode terminal 240 is exposed to the outside of the battery cell 20 to facilitate connection with the busbar component, thereby leading out the electrical energy generated by the electrode assembly 22.

[0126] The electrode assembly 22 is accommodated in the housing 21, and the electrode assembly 22 includes a main body portion 221 and a tab 222 extending from the main body portion 221.

[0127] The electrode assembly 22 can be a wound structure, a laminated structure, or a hybrid structure of winding and lamination.

[0128] In some embodiments, the electrode assembly 22 is a wound structure. The positive electrode tab and the negative electrode tab are wound into a wound structure.

[0129] In some embodiments, the electrode assembly 22 is a laminated structure.

[0130] As an example, a plurality of positive electrode tabs and a plurality of negative electrode tabs can be respectively provided, and the plurality of positive electrode tabs and the plurality of negative electrode tabs are alternately and laminatedly arranged. As an example, a plurality of positive electrode tabs can be provided, and the negative electrode tab is folded to form a plurality of laminatedly arranged folded segments, and one positive electrode tab is clamped between adjacent folded segments.

[0131] As an example, the positive electrode tab and the negative electrode tab are each folded to form a plurality of folded segments arranged in a stack.

[0132] As an example, a plurality of isolation members can be provided, each provided between any adjacent positive electrode tab or negative electrode tab.

[0133] As an example, the isolation member can be continuously provided, and provided between any adjacent positive electrode tab or negative electrode tab by folding or winding.

[0134] In some embodiments, the electrode assembly 22 can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0135] The tab 222 can be directly connected to the first electrode terminal 240, or indirectly connected to the first electrode terminal 240 via other conductive structures.

[0136] The tab 222 can be provided in a plurality. The plurality of tabs 222 includes positive electrode tabs and negative electrode tabs, which can be drawn from the same end of the main body portion 221, or can be drawn from two ends of the main body portion 221 opposite in the thickness direction of the first end cover assembly 24, respectively.

[0137] The tab 222 can include a plurality of tab layers stacked together to form the tab 222. The tab 222 can include at least two parts, one part between the main body portion 221 and the isolation member 23, and the other part between the isolation member 23 and the first electrode terminal 240.

[0138] The isolation member 23 can insulate at least part of the tab 222 from the end surface of the main body portion 221, thereby reducing the risk of the tab 222 being inserted into the main body portion 221 when the battery cell 20 is affected by external impact, vibration, etc., and thus reducing the risk of short circuit of the battery cell 20, which is beneficial to improve the reliability of the battery cell 20.

[0139] The isolation member 23 can be partially provided between the first electrode terminal 240 and the main body portion 221, or can be entirely provided between the first electrode terminal 240 and the main body portion 221.

[0140] The isolation member 23 can be a one-piece structure, or can be a split structure. As an example, the isolation member 23 is connected by a plurality of independently formed parts. As another example, the isolation member 23 is integrally formed by stamping.

[0141] The first end cover assembly 24 is provided with a first clamping structure 5, and the isolation member 23 is provided with a second clamping structure 6. One of the first clamping structure 5 and the second clamping structure 6 has a clasp portion 501, and the other has a clamping groove portion 601. The clasp portion 501 and the clamping groove portion 601 are clamped. In this way, the isolation member 23 can be fixedly connected with the first end cover assembly 24, so as to reduce the risk of the isolation member 23 moving in the battery monomer 20, and further reduce the risk of the tab 222 being pulled and torn.

[0142] As an example, the first clamping structure 5 is a protruding structure protruding towards the electrode assembly 22 in the third direction, and the second clamping structure 6 is an opening structure corresponding to the protruding structure.

[0143] As another example, the second clamping structure 6 is a protruding structure protruding away from the electrode assembly 22 in the third direction, and the first clamping structure 5 is an opening structure corresponding to the protruding structure.

[0144] The third direction is the thickness direction of the first end cover assembly 24, for example, Figure 3 The z direction in the figure.

[0145] The clasp portion 501 has a first clamping surface, and the clamping groove portion 601 has a second clamping surface. The size of the first clamping surface and the second clamping surface along the first direction is smaller than the size along the second direction.

[0146] The clasp portion 501 and the clamping groove portion 601 are clamped by the cooperation of the first clamping surface and the second clamping surface. The first clamping surface and the second clamping surface are both perpendicular to the third direction.

[0147] The size of the first clamping surface and the second clamping surface along the first direction can be the maximum size of the first clamping surface and the second clamping surface along the first direction, and the size of the first clamping surface and the second clamping surface along the second direction can be the maximum size of the first clamping surface and the second clamping surface along the second direction.

[0148] As an example, the second clamping surface of the clamping groove portion 601 is in the shape of a waist circle, and the first clamping surface of the clasp portion 501 has a shape corresponding to the second clamping surface.

[0149] As another example, the second clamping surface of the clamping groove portion 601 is in the shape of a rectangle, and the first clamping surface of the clasp portion 501 has a shape corresponding to the second clamping surface.

[0150] In the embodiments of the present application, the size of the first clamping surface along the first direction is smaller than the size of the first clamping surface along the second direction, and the size of the second clamping surface along the first direction is smaller than the size of the second clamping surface along the second direction.

[0151] Compared with the first clamping surface and the second clamping surface being of the same size in the first direction and the second direction (for example, the first clamping surface and the second clamping surface are both circular in shape), the second direction of the first clamping surface and the second clamping surface is set to be larger than the first direction, which is conducive to increasing the overlapping area between the first clamping surface and the second clamping surface, and the connection between the buckle part 501 and the clamping groove part 601 is more firm.

[0152] In addition, in the case where the isolation member 23 is provided with a passage through which the tab 222 passes, since the space of the isolation member 23 in the second direction is more spacious than that in the first direction, the second clamping surface is set to be smaller in the first direction than in the second direction, which is also conducive to the processing of the clamping groove part 601.

[0153] In the embodiments of the present application, the isolation member 23 is at least partially arranged between the first electrode terminal 240 and the main body part 221, so as to isolate at least part of the tab 222 from the main body part 221 of the electrode assembly 22, thereby reducing the risk of the tab 222 being inserted into the main body part 221 when the battery monomer 20 is impacted or the like, and reducing the risk of short circuit of the battery monomer 20. One of the first clamping structure 5 and the second clamping structure 6 has a buckle part 501, and the other has a clamping groove part 601, the buckle part 501 is clamped with the clamping groove part 601, thereby realizing the fixation between the first end cover assembly 24 and the isolation member 23. The buckle part 501 has a first clamping surface, and the clamping groove part 601 has a second clamping surface, the size of the first clamping surface and the second clamping surface in the first direction is smaller than that in the second direction. In this way, it is conducive to increasing the overlapping area between the first clamping surface and the second clamping surface, and the connection between the buckle part 501 and the clamping groove part 601 is more firm, so as to reduce the risk of the isolation member 23 moving in the battery monomer 20, and thereby reduce the risk of the tab 222 being pulled and torn. Therefore, the technical scheme of the embodiments of the present application is conducive to improving the reliability of the battery monomer 20.

[0154] In some embodiments, the first clamping structure 5 is a protruding structure 50 protruding towards the electrode assembly 22 in a third direction, and the protruding structure 50 includes the buckle part 501; the second clamping structure 6 is an opening structure 60 corresponding to the protruding structure 50, and the opening structure 60 includes the clamping groove part 601, and the third direction is the thickness direction of the first end cover assembly 24.

[0155] As an example, the first end cap assembly 24 includes an end cap 241 and an insulating member 242. Along the third direction, the insulating member 242 is closer to the electrode assembly 22 relative to the end cap 241 and has a protruding structure 50. Along the third direction, the protruding structure 50 protrudes toward the electrode assembly 22 relative to the end cap 241, and the opening structure 60 is provided corresponding to the protruding structure 50. In this way, the first end cap assembly 24 is fixed and connected to the isolation member 23 through the cooperation of the protruding structure 50 and the opening structure 60.

[0156] In the above embodiment, the snap-fit ​​portion 501 of the protruding structure 50 is snapped into the slot portion 601 of the opening structure 60, thereby realizing the connection between the first end cover assembly 24 and the isolation member 23; in addition, the first snap-fit ​​structure 5 is a protruding structure 50, and the second snap-fit ​​structure 6 is an opening structure 60, which facilitates the processing of the first end cover assembly 24 and the isolation member 23.

[0157] Figure 10 A schematic diagram of a first outline of an embodiment of the present application; Figure 11 This is a schematic diagram of a second outline of an embodiment of the present application.

[0158] In some embodiments, reference Figure 10 and Figure 11 As shown, the first snap-fit ​​surface has a first profile 80, the second snap-fit ​​surface has a second profile 90, the first profile 80 includes a first straight line segment 81, the first straight line segment 81 extends along the second direction, the second profile 90 includes a third straight line segment 91, the third straight line segment 91 extends along the second direction, and the first profile 80 and the second profile 90 are perpendicular to the third direction.

[0159] As an example, the number of the first contours 80 is two, and the two first contours 80 of the first locking surface of the locking portion 501 are symmetrical along the second direction, and each first contour 80 includes a first straight line segment 81 .

[0160] As an example, the number of the second contours 90 is 1, and the second contour 90 includes two third straight line segments 91 .

[0161] As an example, the first outline 80 is a rectangle, and the second outline 90 is a rectangle. In this way, the overlapping area between the buckle portion 501 and the slot portion 601 is larger, and the engagement between the buckle portion 501 and the slot portion 601 is more secure.

[0162] As an example, the two first contours 80 define a waisted circular area, and the second contour 90 is waisted circular. In this way, the area of ​​the overlapping area between the buckle portion 501 and the slot portion 601 is more appropriate, and it also facilitates the assembly between the buckle portion 501 and the slot portion 601.

[0163] In the case where the isolation member 23 is provided with a passage 2330 through which the tab 222 passes in the middle region in the first direction, the space of the isolation member 23 in the second direction is more generous than the space in the first direction, and in the first profile 80 and the second profile 90, the provision of the first straight line segment 81 and the third straight line segment 91 extending in the second direction is more conducive to the processing of the buckle portion 501 and the clamping groove portion 601.

[0164] In the above embodiment, the first straight line segment 81 and the third straight line segment 91 extend in the second direction, which is conducive to the processing of the buckle portion 501 and the clamping groove portion 601, and also conducive to increasing the area of the overlapping region between the buckle portion 501 and the clamping groove portion 601, thereby improving the connection strength between the first end cover assembly 24 and the isolation member 23.

[0165] In some embodiments, the first profile 80 and the second profile 90 include at least one straight line segment.

[0166] The at least one straight line segment in the first profile 80 corresponds to the at least one straight line segment in the second profile 90, so that the first profile 80 and the second profile 90 have a longer coinciding length, the area of the overlapping region of the buckle portion 501 and the clamping groove portion 601 is larger, and the connection between the buckle portion 501 and the clamping groove portion 601 is more secure.

[0167] Compared with a circular profile, the first profile 80 and the second profile 90 include at least one straight line segment (for example, the length of the straight line segment is equal to the diameter of the circular profile), which is conducive to increasing the area of the overlapping region of the first clamping structure 5 and the second clamping structure 6, thereby the clamping between the first clamping structure 5 and the second clamping structure 6 is more secure, the first clamping structure 5 is less likely to be separated from the second clamping structure 6, and the connection between the first end cover assembly 24 and the isolation member 23 is more secure. When the battery monomer is affected by factors such as vibration and extrusion, the risk of movement of the isolation member 23 is lower, and the risk of pulling and tearing of the tab 222 is lower, and the battery monomer 20 has higher reliability.

[0168] In addition, compared with increasing the diameter of the circular profile, by providing at least one straight line segment in the first profile 80 and the second profile 90, it is also conducive to keeping the clamping groove portion 601 at a suitable size, and the clamping groove portion 601 has a more suitable strength.

[0169] The first profile 80 and the second profile 90 can be a waist circle, a rectangle, a square, or other irregular polygons.

[0170] As an example, the first profile 80 and the second profile 90 each include two straight line segments, and the two straight line segments are parallel. For example, the profile of the cross section of the slot portion 601 is a waist circle, and the shape of the cross section of the buckle portion 501 is a waist circle. For another example, in the case where the buckle portion 501 is provided with a deformation groove, the profile of the cross section of the buckle portion 501 is two independent profiles, and the two independent profiles are spliced to form a waist circle.

[0171] In some embodiments, the length L1 of the first straight line segment 81 satisfies: 0.5mm≤L1≤5mm, and / or the length L2 of the third straight line segment 91 satisfies: 0.5mm≤L2≤5mm.

[0172] L1 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, or any value within the above range; L2 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, or any value within the above range.

[0173] As an example, L1 and L2 are the same.

[0174] In the case where L1 and L2 are greater than or equal to 0.5mm, the length of the overlapping area of the buckle portion 501 and the slot portion 601 along the second direction is large, the overlapping area has a large area, the buckle portion 501 and the slot portion 601 have a strong clamping strength, and the buckle portion 501 has a high structural strength; in the case where L1 and L2 are less than or equal to 5mm, the slot portion 601 has a suitable size, which can reduce the adverse effects on the strength of the slot portion 601 due to the excessive size of the slot portion 601 along the second direction, and the slot portion 601 has a high structural strength.

[0175] In the above embodiments, 0.5mm≤L1≤5mm, and / or 0.5mm≤L2≤5mm, L1 and L2 have suitable sizes, the overlapping area between the buckle portion 501 and the slot portion 601 has a large area, the connection strength between the first end cover assembly 24 and the isolation member 23 is large, which is conducive to reducing the risk of movement of the isolation member 23 in the battery monomer 20 and tearing of the tab 222, and the buckle portion 501 and the slot portion 601 have a high structural strength, and the battery monomer 20 has high reliability.

[0176] In some embodiments, 2mm≤L1≤4mm, and / or 2mm≤L2≤4mm. In this way, the connection strength between the first end cover assembly 24 and the isolation member 23 is suitable, and the buckle portion 501 and the slot portion 601 have a high structural strength, and the battery monomer 20 has high reliability.

[0177] In some embodiments, the first profile 80 comprises a first arc segment 82 and a second arc segment 83, the first arc segment 82 and the second arc segment 83 are connected with two ends of the first straight segment 81 respectively.

[0178] As an example, the first profile 80 further comprises a second straight segment 84, the second straight segment 84 is perpendicular to the first straight segment 81, the first straight segment 81, the first arc segment 82, the second straight segment 84, the first arc segment 82, the first straight segment 81, the second arc segment 83, the second straight segment 84, and the second arc segment 83 are connected in sequence to form the first profile 80.

[0179] Compared with all straight segments in the first profile 80, the first arc segment 82 and the second arc segment 83 are beneficial to the processing of the buckle part 501 and facilitate the buckle part 501 to enter the clamping groove part 601.

[0180] In some embodiments, the radius R1 of the first arc segment 82 and the second arc segment 83 satisfies: 0.3mm≤R1≤2.5mm.

[0181] The first arc segment 82 and the second arc segment 83 can be the same arc segment.

[0182] R1 can be 0.3mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.1mm, 2.5mm or any value within the above range.

[0183] As an example, the first arc segment 82 and the second arc segment 83 are quarter circles. In this way, when R1 satisfies the above range, the first arc segment 82 and the second arc segment 83 can be well matched with the length of the first straight segment 81, which is beneficial to the processing of the buckle part 501.

[0184] In the above embodiments, 0.3mm≤R1≤2.5mm, the first arc segment 82 and the second arc segment 83 have a suitable size, which is beneficial to the processing of the buckle part 501 and the smooth entry of the buckle part 501 into the clamping groove part 601.

[0185] In some embodiments, 1.0mm≤R1≤2.1mm. In this way, the first arc segment 82 and the second arc segment 83 have a suitable size, which is beneficial to the processing of the buckle part 501 and the smooth entry of the buckle part 501 into the clamping groove part 601.

[0186] In some embodiments, the second profile 90 comprises a third arc segment 92 and a fourth arc segment 93, the third arc segment 92 and the fourth arc segment 93 are connected with two ends of the third straight segment 91 respectively.

[0187] As an example, the second contour 90 includes two third straight line segments 91, a third arc segment 92 and a fourth arc segment 93, wherein the third straight line segment 91, the third arc segment 92, the third straight line segment 91 and the fourth arc segment 93 are connected in sequence.

[0188] In the above embodiment, by providing the third arc segment 92 and the fourth arc segment 93 , it is convenient for processing the slot portion 601 and for the buckle portion 501 to enter the slot portion 601 .

[0189] In some embodiments, the radius R2 of the third arc segment 92 and the fourth arc segment 93 satisfies: 0.5 mm ≤ R2 ≤ 2.7 mm.

[0190] The third arc segment 92 and the fourth arc segment 93 may be the same arc segment.

[0191] R2 can be 0.5 mm, 0.8 mm, 1 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm or any value within the above range.

[0192] As an example, the third arc segment 92 and the fourth arc segment 93 are semicircular arcs. In this way, the lengths of the third arc segment 92 and the fourth arc segment 93 can match the length of the third straight line segment 91 , facilitating the processing of the slot portion 601 .

[0193] The radii of the third arc segment 92 and the fourth arc segment 93 are larger than the radii of the first arc segment 82 and the second arc segment 83 , so that the buckle portion 501 can smoothly enter the slot portion 601 .

[0194] In the above embodiment, the third arc segment 92 and the fourth arc segment 93 have appropriate sizes, which facilitates the processing of the slot portion 601 and the smooth entry of the buckle portion 501 into the slot portion 601 .

[0195] In some embodiments, 1.2 mm ≤ R2 ≤ 2.3 mm. Thus, the third arc segment 92 and the fourth arc segment 93 have appropriate sizes, which facilitates the processing of the slot portion 601 and the smooth insertion of the buckle portion 501 into the slot portion 601 .

[0196] In some embodiments, along the first direction, a dimension L3 of an overlapping area between the locking portion 501 and the locking groove portion 601 satisfies: 0.15 mm≤L3≤0.5 mm, and the first direction is the length direction of the isolation member 23 .

[0197] For example, Figures 3 to 9 As shown, the first direction is the x direction.

[0198] L3 can be 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.4 mm, 0.5 mm or any value within the above range.

[0199] When L3 is greater than or equal to 0.15 mm, the overlapping area between the snap portion 501 and the slot portion 601 is longer in the first direction, and the area of ​​the overlapping area between the snap portion 501 and the slot portion 601 is larger, so the snap portion 501 is not easy to detach from the slot portion 601; when L3 is less than or equal to 0.5 mm, it is easy for the snap portion 501 to enter the slot portion 601.

[0200] In the above embodiment, 0.15mm≤L3≤0.5mm, the overlapping area between the snap portion 501 and the slot portion 601 has a large area, the connection strength between the first end cover assembly 24 and the isolation member 23 is large, the risk of the isolation member 23 moving in the battery cell 20 and the risk of the tab 222 tearing are low, and the battery cell 20 has high reliability; in addition, it is also convenient for the snap portion 501 to enter the slot portion 601.

[0201] In some embodiments, 0.2 mm ≤ L3 ≤ 0.4 mm. In this way, the overlapping area of ​​the buckle portion 501 and the slot portion 601 has a more appropriate size in the first direction, which makes it easier for the buckle portion 501 to fit into the slot portion 601 and prevents the buckle portion 501 from being easily separated from the slot portion 601.

[0202] Figure 12 This is a schematic structural diagram of a first end cover assembly according to an embodiment of the present application; Figure 13 for Figure 12 An enlarged schematic diagram of region E in FIG. Figure 14 This is a schematic structural diagram of an isolation component according to an embodiment of the present application;

[0203] Figure 15 A top view of an isolation member according to an embodiment of the present application; Figure 16 A schematic diagram of a protruding structure according to an embodiment of the present application; Figure 17 FIG. 1 is a schematic diagram of an opening structure according to an embodiment of the present application.

[0204] In some embodiments, combined Figures 7 to 17 As shown, the protruding structure 50 includes a snap-fit ​​portion 501, a connecting portion 502 and a transition portion 503, and the two ends of the connecting portion 502 along the third direction are respectively connected to the transition portion 503 and the snap-fit ​​portion 501; the opening structure 60 includes a slot portion 601, a guide portion 603 and a limiting portion 602, and the two ends of the limiting portion 602 along the third direction are respectively connected to the guide portion 603 and the slot portion 601.

[0205] As an example, the guiding portion 603 gradually decreases in size in the first direction along the third direction and towards the electrode assembly 22; correspondingly, the transition portion 503 gradually decreases in size in the first direction along the third direction and towards the electrode assembly 22. The guiding portion 603 and the transition portion 503 are matched, and the guiding portion 603 can guide the protruding structure 50 to enter the opening structure 60.

[0206] As an example, the limiting portion 602 is constant in size in the first direction along the third direction, and the connecting portion 502 is constant in size in the first direction. For example, the limiting portion 602 is a cylindrical through hole, and the connecting portion 502 is a cylindrical structure.

[0207] The buckling portion 501 is connected with the connecting portion 502, and the buckling portion 501 protrudes from the connecting portion 502 in the first direction. The first direction is the length direction of the isolation member 23, for example, the x direction in FIG. 6. In this way, the buckling portion 501 is facilitated to be limited in the clamping groove portion 601. Figures 3 to 8

[0208] In the above embodiment, the guiding portion 603 can guide the protruding structure 50 to enter the opening structure 60, and the limiting portion 602 can limit the movement of the buckling portion 501 of the protruding structure 50 along the third direction after the buckling portion 501 enters the clamping groove portion 601, thereby reducing the risk of the buckling portion 501 disengaging from the clamping groove portion 601.

[0209] In some embodiments, along the first direction, the size D1 of the limiting portion 602, the size D2 of the connecting portion 502, and the size D3 of the buckling portion 501 satisfy: D2 < D1 < D3.

[0210] D1 can be the maximum size of the limiting portion 602 in the first direction, D2 can be the maximum size of the connecting portion 502 in the first direction, and D3 can be the maximum size of the buckling portion 501 in the first direction.

[0211] Along the first direction, the size of the limiting portion 602 is smaller than the size D3 of the buckling portion 501 and larger than the size of the connecting portion 502, so that after the buckling portion 501 enters the clamping groove portion 601, the limiting portion 602 can limit the buckling portion 501 from disengaging from the clamping groove portion 601 along the third direction.

[0212] In the above embodiment, the guiding portion 603 can guide the protruding structure 50 to enter the opening structure 60, and the limiting portion 602 can limit the movement of the buckling portion 501 of the protruding structure 50 along the third direction after the buckling portion 501 enters the clamping groove portion 601, thereby reducing the risk of the buckling portion 501 disengaging from the clamping groove portion 601.

[0213] In some embodiments, 0.05 mm ≤ D1-D2 ≤ 1 mm.

[0214] ​D1-D2 can be 0.05 mm, 0.1 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm or any value within the above range.

[0215] When D1-D2 is greater than or equal to 0.05 mm, it is convenient for the connecting portion 502 to pass through the limiting portion 602; when D1-D2 is less than or equal to 1 mm, the size difference between the connecting portion 502 and the limiting portion 602 along the first direction has an appropriate range, which can reduce the size of the limiting portion 602 in the first direction and increase the structural strength of the opening structure 60. In addition, it is also beneficial to reduce the risk of the snap portion 501 detaching from the limiting portion 602 after being inserted into the slot portion 601.

[0216] In the above embodiment, 0.05mm≤D1-D2≤1mm, the limiting portion 602 of the opening structure 60 and the connecting portion 502 of the protruding structure 50 have appropriate sizes, which can not only enable the connecting portion 502 to enter the slot portion 601 through the limiting portion 602, but also reduce the risk of the snap portion 501 escaping from the slot portion 601.

[0217] In some embodiments, 0.4 mm ≤ D1 - D2 ≤ 0.6 mm. Thus, the limiting portion 602 of the opening structure 60 and the connecting portion 502 of the protruding structure 50 have appropriate sizes, which not only allows the connecting portion 502 to pass through the limiting portion 602 and enter the slot 601, but also reduces the risk of the buckle portion 501 falling out of the slot 601.

[0218] In some embodiments, the protruding structure 50 includes a deformation groove 504 , which penetrates the buckle portion 501 and at least a portion of the connecting portion 502 along the third direction, and a width direction of the deformation groove 504 is perpendicular to the second direction.

[0219] As an example, the deformation groove 504 is a groove opening toward the electrode assembly 22 . Along the third direction, the deformation groove 504 passes through the buckle portion 501 and the connecting portion 502 .

[0220] The side wall of the deformation groove 504 may have a certain angle with the third direction, or may be parallel to the third direction, or a portion of the side wall may be parallel to the third direction and another portion may have a certain angle with the third direction.

[0221] Through the setting of the deformation groove 504, the snap portion 501 and the connecting portion 502 can be deformed along the first direction. Specifically, the dimensions of the snap portion 501 and the connecting portion 502 in the first direction can be reduced, so that in the process of snapping the protruding structure 50 into the opening structure 60, the snap portion 501 passes through the limiting portion 602 and is snapped into the slot portion 601.

[0222] In some embodiments, the size D4 of the deformation groove 504 in the first direction satisfies: 0.3mm≤D4≤1.5mm.

[0223] D4 can be 0.3mm, 0.5mm, 0.6mm, 0.7mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.5mm, or any value within the above range.

[0224] As an example, the size D4 of the deformation groove 504 in the first direction can be the size of the deformation groove 504 in the first direction at a position where the buckle portion 501 and the connecting portion 502 are connected.

[0225] In the case where D4 is greater than or equal to 0.3mm, during the process of the buckle portion 501 being inserted into the card slot portion 601, the size of the buckle portion 501 in the first direction can be reduced within a certain range, facilitating the buckle portion 501 to pass through the limiting portion 602 and then enter the card slot portion 601; in the case where D4 is less than or equal to 1.5mm, the deformation groove 504 has a suitable size in the first direction, which can reduce the reduction of the strength of the connecting portion 502 and the buckle portion 501 due to the size of the deformation groove 504 in the first direction being too large, and the protruding structure 50 has a suitable strength.

[0226] In the above embodiments, the deformation groove 504 has a suitable size in the first direction, which facilitates the buckle portion 501 to enter the card slot portion 601 during the assembly of the first end cover assembly 24 and the isolation member 23, and the protruding structure 50 has a relatively suitable strength, which is beneficial to the assembly of the battery monomer 20 and the improvement of the reliability of the battery monomer 20.

[0227] In some embodiments, 0.7mm≤D4≤1.1mm. In this way, the deformation groove 504 has a suitable size in the first direction, which facilitates the buckle portion 501 to be smoothly inserted into the card slot portion 601 while taking into account the strength of the protruding structure 50, and is beneficial to the assembly of the battery monomer 20 and the improvement of the reliability of the battery monomer 20.

[0228] In some embodiments, the second contour 90 is a waist-round shape.

[0229] In this way, the overlapping area between the card slot portion 601 and the buckle portion 501 has a relatively large area and facilitates the protruding structure 50 to be inserted into the opening structure 60, thereby facilitating the assembly between the first end cover assembly 24 and the isolation member 23 and the improvement of the connecting strength therebetween.

[0230] In some embodiments, the protruding structure 50 includes a first fixing portion 505, which is connected to the transition portion 503 and is spaced away from the electrode assembly 22 relative to the transition portion 503 along the third direction. The opening structure 60 includes a second fixing portion 604, which is connected to the guide portion 603 and is spaced away from the electrode assembly 22 relative to the guide portion 603 along the third direction. The first fixing portion 505 abuts against the second fixing portion 604. In this way, the abutment between the first fixing portion 505 and the second fixing portion 604 can achieve fixation of the protruding structure 50 and the opening structure 60 in the first direction.

[0231] In some embodiments, the first end cover assembly 24 is provided with two first clip structures 5, and the two first clip structures 5 are respectively arranged in the end areas of the first end cover assembly 24 along the first direction, and the first direction is the length direction of the isolation member 23; the isolation member 23 is provided with two second clip structures 6, and the two second clip structures 6 are respectively arranged in the end areas of the isolation member 23 along the first direction.

[0232] In the above technical solution, the provision of two first clamping structures 5 and two second clamping structures 6 facilitates increasing the connection strength between the first end cap assembly 24 and the isolation member 23. Furthermore, the provision of the second clamping structures 6 at the end region of the isolation member 23 in the first direction facilitates providing a passage for the tab 222 to pass through in the central region of the isolation member 23, thereby facilitating connection between the tab 222 and the first electrode terminal 240.

[0233] In some embodiments, the isolation member 23 is provided with a channel 2330 . The channel 2330 is provided in a middle region of the isolation member 23 along the first direction. The tab 222 passes through the channel and is electrically connected to the first electrode terminal 240 .

[0234] In the above technical solution, the channel 2330 is provided in the middle area of ​​the isolation member 23 along the first direction. The channel 2330 is convenient for corresponding to the tab 222 , so that the tab 222 passes through the channel 2330 and is electrically connected to the first electrode terminal 240 .

[0235] In some embodiments, the first end cover assembly 24 includes an end cover 241 and an insulating member 242 . The end cover 241 is used to cover the first opening 211 , and the insulating member 242 is provided with a first clamping structure 5 .

[0236] The insulating member 242 is used to isolate the end cover 241 from the electrode assembly 22 . The insulating member 242 and the first clamping structure 5 may be integrally formed.

[0237] The first electrode terminal 240 may be disposed on the end cap 241 , and the tab 222 of the electrode assembly 22 passes through the channel 2330 of the isolation member 23 and is connected to the first electrode terminal 240 .

[0238] The end cap 241 may be made of metal and be conductive, and the insulating member 242 may be made of plastic.

[0239] In the above embodiment, the end cap 241 covers the first opening 211 of the housing 21, and the first electrode terminal 240 on the end cap is electrically connected to the electrode tab 222. The first engaging structure 5 of the insulating member is engaged with the second engaging structure 6 of the isolation member 23. The provision of the first end cap assembly 24 facilitates the connection of the first end cap assembly 24, the isolation member 23, and the electrode assembly 22.

[0240] In some embodiments, the battery cell 20 further includes a second end cover assembly 25 , which is used to cover an opening at the other end of the housing 21 .

[0241] The shell 21 may be a hollow structure with openings at both ends, and the first end cover assembly 24 and the second end cover assembly 25 respectively cover the openings at both ends of the shell 21 .

[0242] Specifically, the first end cap assembly 24 and the second end cap assembly 25 are disposed opposite each other along the thickness direction of the first end cap assembly 24. The housing 21 is provided with a first opening 211 and a second opening 212 that are disposed opposite each other along the thickness direction of the isolation plate 231. The first opening 211 is provided at one end of the first end cap assembly 24 that is closer to the isolation member 23 along the thickness direction, and the second opening 212 is provided at one end of the first end cap assembly 24 that is farther from the isolation member 23 along the thickness direction. The first end cap assembly 24 is used to cover the first opening 211, and the second end cap assembly 25 is used to cover the second opening 212. As an example, the second end cap assembly 25 is further provided with a second electrode terminal 251, which has an opposite polarity to the first electrode terminal 240 provided on the first end cap assembly 24.

[0243] As an example, the second end cover assembly 25 has a different structure from the first end cover assembly 24 , and the second end cover assembly 25 is not provided with a protrusion that cooperates with the opening structure 60 .

[0244] In some embodiments, the isolation member 23 includes a side wall 230 and an isolation plate 231 . The side wall 230 includes a first side wall 2301 and a second side wall 2302 . The first side wall 2301 extends along a first direction, and the second side wall 2302 extends along a second direction. The opening structure 60 is protruded from the isolation plate 231 .

[0245] In some embodiments, the channel 2330 is disposed on the isolation plate 231 .

[0246] In some embodiments, the isolation member 23 further comprises a reinforcing structure 232 connected to the outer sidewall of the opening structure 60 and the sidewall 230. As an example, the reinforcing structure 232 is connected to the outer sidewall of the opening structure 60 and the first sidewall 2301. By providing the reinforcing structure 232, the strength of the opening structure 60 can be enhanced, and the risk of deformation of the opening structure 60 and the risk of the protrusion structure 50 being detached from the opening structure 60 can be reduced.

[0247] In some embodiments, the isolation plate 231 is provided with a through hole 237. For example, the end region of the isolation plate 231 is provided with the through hole 237 along the second direction. By providing the through hole 237, the accumulation of electrolyte in the isolation member 23 can be reduced.

[0248] In some embodiments, the battery cell 20 further comprises an insulating film 26, which is sleeved on the outer surface of the electrode assembly 22 and is arranged on the inner side of the casing 21. In this way, the electrode assembly 22 can be isolated from the casing 21, and the risk of short circuit caused by contact between the electrode assembly 22 and the casing 21 can be reduced. In addition, the isolation member 23 can be connected to the electrode assembly 22 through the insulating film 26, thereby facilitating the assembly of the battery cell 20.

[0249] As an example, the insulating film 26 is an insulating thermoplastic isolation film, such as a mylar film.

[0250] In some embodiments, the battery cell 20 further comprises a side support plate 27 arranged between the electrode assembly 22 and the inner side of the casing 21. The side support plate 27 can support the electrode assembly 22, and the electrode assembly 22 and the isolation member 23 can be connected through the side support plate 27, thereby facilitating the assembly of the battery cell 20.

[0251] In some embodiments, the battery cell 20 comprises a pressure relief mechanism. The pressure relief mechanism can be arranged on the casing 21, the first end cover assembly 24, or the second end cover assembly 25. The pressure relief mechanism is used to discharge the internal discharge of the battery cell, which includes but is not limited to electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gas generated by reaction, flames, etc.

[0252] As an example, the internal pressure or temperature of the battery cell 20 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is different according to different design requirements. The threshold value can depend on the material of one or more of the positive electrode plate, the negative electrode plate, the electrolyte, and the separator in the battery cell.

[0253] According to some embodiments of the present application, the present application also provides a battery apparatus comprising the battery cell 20 of any of the above aspects.

[0254] The battery apparatus referred to in the embodiments of the present application can comprise one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can comprise a plurality of battery cells 20 connected in series, in parallel or in a mixed connection through a busbar component.

[0255] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells 20.

[0256] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into a separate module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0257] In some embodiments, the battery apparatus can be a battery pack comprising a housing and one or more battery cell assemblies housed in the housing.

[0258] As an example, the battery cell assembly can be a battery module, which can be housed in the housing by fixing the battery module in the housing.

[0259] As an example, the battery cell assembly can also be housed in the housing by directly fixing a plurality of battery cells in the housing.

[0260] As an example, the housing can comprise a first housing and a second housing. The first housing and the second housing are fastened so that an enclosed space is formed inside the housing to accommodate the battery cell assembly. The enclosed here means covered or closed, which can be sealed or unsealed. The first housing can be a top cover or a bottom plate.

[0261] As an example, the housing can comprise a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that an enclosed space is formed inside the housing to accommodate the battery cell assembly.

[0262] In some embodiments, the housing can be part of the chassis structure of a vehicle. For example, part of the housing can be at least part of the floor of the vehicle, or part of the housing can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0263] According to some embodiments of the present application, the present application also provides a battery device, comprising the battery device according to any one of the preceding embodiments.

[0264] The battery device can be used in any of the devices or systems mentioned above.

[0265] According to some embodiments of the present application, referring to Figures 3 to 16 As shown in the drawings, the present application provides a battery cell 20, which comprises a shell 21, a first end cover assembly 24, an electrode assembly 22 and a separation member 23. The separation member 23 is at least partially arranged between the first electrode terminal 240 and the main body part 221, so as to separate at least part of the tab 222 from the main body part 221 of the electrode assembly 22, thereby reducing the risk of the tab 222 being inserted into the main body part 221 and reducing the risk of short circuit of the battery cell 20 when the battery cell 20 is impacted or the like. The first end cover assembly 24 is provided with a protruding structure 50 protruding towards the electrode assembly 22, and the separation member 23 is provided with an opening structure 60 corresponding to the protruding structure 50. The protruding structure 50 comprises a buckle part 501, and the opening structure 60 comprises a clamping groove part 601. The buckle part 501 is clamped into the clamping groove part 601 to fix the first end cover assembly 24 and the separation member 23. The cross section of the clamping groove part 601 is a waist circle, and the number of the cross section profile of the buckle part 501 is two, and the two profiles are symmetrically arranged along the width direction of the separation member 23, and the two profiles are spliced into a waist circle, wherein the cross section is perpendicular to the thickness direction of the first end cover assembly 24. In this way, the area of the overlapping area between the first clamping structure 5 and the second clamping structure 6 can be increased, the risk of the first clamping structure 5 being separated from the second clamping structure 6 can be reduced, and the connection strength between the first clamping structure 5 and the second clamping structure 6 can be increased, thereby the risk of the separation member 23 moving in the battery cell 20 can be reduced, and the risk of the tab 222 being pulled and torn can be reduced.

[0266] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a first end cap assembly (24), the first end cap assembly (24) including a first electrode terminal (240); An electrode assembly (22), the electrode assembly (22) comprising a main body (221) and a tab (222) extending from the main body (221); an isolation member (23), the isolation member (23) being at least partially disposed between the first electrode terminal (240) and the main body (221); The first end cover assembly (24) is provided with a first clamping structure (5), and the isolation member (23) is provided with a second clamping structure (6). One of the first clamping structure (5) and the second clamping structure (6) has a clamping portion (501), and the other has a clamping slot portion (601). The clamping portion (501) is clamped with the clamping slot portion (601). The clamping portion (501) has a first clamping surface, and the clamping slot portion (601) has a second clamping surface. The dimensions of the first clamping surface and the second clamping surface along the first direction are smaller than the dimensions along the second direction. The first direction is the length direction of the isolation member (23), and the second direction is the width direction of the isolation member (23).

2. The battery cell according to claim 1, wherein: The first clamping structure (5) is a protruding structure (50) protruding toward the electrode assembly (22) along a third direction, the protruding structure (50) including the buckle portion (501), the second clamping structure (6) is an opening structure (60) corresponding to the protruding structure (50), the opening structure (60) including the slot portion (601), and the third direction is the thickness direction of the first end cover assembly (24).

3. The battery cell according to claim 2, characterized in that: The first engaging surface has a first profile (80), the first profile (80) includes a first straight line segment (81), and the first straight line segment (81) extends along the second direction; The second engaging surface has a second profile (90), the second profile (90) includes a third straight line segment (91), and the third straight line segment (91) extends along the second direction; The first profile (80) and the second profile (90) are perpendicular to the third direction.

4. The battery cell according to claim 3, characterized in that The length L1 of the first straight line segment (81) satisfies: 0.5 mm ≤ L1 ≤ 5 mm, and / or the length L2 of the third straight line segment (91) satisfies: 0.5 mm ≤ L2 ≤ 5 mm.

5. The battery cell according to claim 4, characterized in that 2mm≤L1≤4mm, and / or, 2mm≤L2≤4mm.

6. The battery cell according to claim 3, characterized in that The first contour (80) includes a first arc segment (82) and a second arc segment (83), and the first arc segment (82) and the second arc segment (83) are respectively connected to two ends of the first straight line segment (81).

7. The battery cell according to claim 6, characterized in that The radius R1 of the first arc segment (82) and the second arc segment (83) satisfies: 0.3 mm ≤ R1 ≤ 2.5 mm.

8. The battery cell according to claim 7, characterized in that 1.0mm≤R1≤2.1mm.

9. The battery cell according to claim 6, characterized in that: The first contour (80) includes a second straight line segment (84), the second straight line segment (84) is parallel to the first direction, and the two ends of the first arc segment (82) are respectively connected to the first straight line segment (81) and the second straight line segment (84).

10. The battery cell according to claim 3, characterized in that The second contour (90) includes a third arc segment (92) and a fourth arc segment (93), and the third arc segment (92) and the fourth arc segment (93) are respectively connected to two ends of the third straight line segment (91).

11. The battery cell according to claim 10, characterized in that The radius R2 of the third arc segment (92) and the fourth arc segment (93) satisfies: 0.5 mm ≤ R2 ≤ 2.7 mm.

12. The battery cell according to claim 11, characterized in that 1.2mm≤R2≤2.3mm.

13. The battery cell according to claim 1, characterized in that Along the first direction, a dimension L3 of an overlapping area between the buckle portion (501) and the slot portion (601) satisfies the following relationship: 0.15 mm ≤ L3 ≤ 0.5 mm.

14. The battery cell according to claim 13, characterized in that 0.2mm≤L3≤0.4mm.

15. The battery cell according to claim 2, characterized in that The protruding structure (50) comprises the buckle portion (501), a connecting portion (502) and a transition portion (503), and the connecting portion (502) is connected to the transition portion (503) and the buckle portion (501) at two ends along the third direction respectively; The opening structure (60) comprises the slot portion (601), a limiting portion (602) and a guide portion (603), and the limiting portion (602) is connected to the guide portion (603) and the slot portion (601) at two ends along the third direction.

16. The battery cell according to claim 15, characterized in that Along the first direction, the size D1 of the limiting portion (602), the size D2 of the connecting portion (502), and the size D3 of the buckle portion (501) satisfy: D2 <D1<D3。 17. The battery cell according to claim 16, characterized in that 0.05mm≤D1-D2≤1mm.

18. The battery cell according to claim 17, characterized in that 0.4mm≤D1-D2≤0.6mm.

19. The battery cell according to claim 15, characterized in that The protruding structure (50) comprises a deformation groove (504), the deformation groove (504) passing through the buckle portion (501) and at least a portion of the connecting portion (502) along the third direction, and the width direction of the deformation groove (504) is perpendicular to the second direction.

20. The battery cell according to claim 19, characterized in that Along the first direction, a dimension D4 of the deformation groove satisfies: 0.3 mm ≤ D4 ≤ 1.5 mm.

21. The battery cell according to claim 20, characterized in that 0.7mm≤D4≤1.1mm.

22. The battery cell according to claim 1, characterized in that The first end cover assembly (24) is provided with two first clamping structures (5), and the two first clamping structures (5) are respectively provided at the end areas of the first end cover assembly (24) along the first direction; The isolation member (23) is provided with two second clamping structures (6), and the two second clamping structures (6) are respectively provided at end regions of the isolation member (23) along the first direction.

23. The battery cell according to claim 1, characterized in that The isolation member (23) is provided with a channel (2330), the channel (2330) is provided in a middle area of ​​the isolation member (23) along a first direction, the tab passes through the channel (2330) and is electrically connected to the first electrode terminal (240).

24. The battery cell according to any one of claims 1 to 23, characterized in that: The battery cell comprises a housing (21), wherein the housing (21) has a first opening (211); The first end cover assembly (24) comprises an end cover and an insulating member (242), the end cover is used to cover the first opening (211), and the insulating member (242) is provided with the first clamping structure (5).

25. A battery device, characterized in that: include: A plurality of battery cells according to any one of claims 1-24.

26. An electrical device, characterized in that: include: The battery device according to claim 25 or the plurality of battery cells according to any one of claims 1 to 24, wherein the battery cells or the battery device are used to provide electrical energy.

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