Battery cell, battery, battery module and electric equipment

Abstract

The utility model discloses a battery cell, battery, battery module and electric equipment, and relates to battery technical field, the battery cell includes: positive pole piece and negative pole piece, positive pole piece includes positive pole dressing area, positive pole tab is formed on at least one side of positive pole dressing area, negative pole piece includes negative pole dressing area, negative pole tab is formed on at least one side of negative pole dressing area. Wherein the positive pole pieces and the negative pole pieces are alternately stacked, the orthographic projection of the positive pole dressing area on the plane where the negative pole dressing area is located is completely located in the negative pole dressing area, and the projection of the positive pole lug and the projection of the negative pole lug on the plane where the negative pole dressing area is located are spaced. According to the battery cell, the maximum charging and discharging current of the battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a battery cell, a battery, a battery module and an electrical device using the same. Background Art

[0002] In the prior art, the electrode sheet needs to leave a blank on one side for dressing to form an electrode tab, and the electrode tab is cut, and the electrode tab is led out and connected to the conductive terminal of the battery. This easily leads to limited connection area between the conductive terminal and the electrode tab, and the current-carrying capacity of the electrode tab is low, which becomes an adverse factor restricting high-power charging and discharging of the battery. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery cell, which can increase the maximum charging and discharging current of the battery.

[0004] The utility model also provides a battery with the above battery cell.

[0005] The utility model also provides a battery module with the above battery.

[0006] The utility model also provides an electrical device with the above battery or battery module.

[0007] The battery cell according to the embodiment of the utility model includes: a positive electrode sheet, the positive electrode sheet includes a positive electrode dressing area, and at least one side of the positive electrode dressing area forms a positive electrode tab; a negative electrode sheet, the negative electrode sheet includes a negative electrode dressing area, and at least one side of the negative electrode dressing area forms a negative electrode tab; wherein, the positive electrode sheet and the negative electrode sheet are alternately stacked, and the orthographic projection of the positive electrode dressing area on the plane where the negative electrode dressing area is located is completely located within the negative electrode dressing area; the projections of the positive electrode tab and the negative electrode tab on the plane where the negative electrode dressing area is located are spaced apart.

[0008] The battery cell according to the embodiment of the utility model can reduce the blockage of the electrode tab led out in the circumferential direction by directly alternately stacking the positive electrode sheet and the negative electrode sheet. It is beneficial to increase the areas of the positive electrode tab and the negative electrode tab, thereby increasing the current-carrying area of the positive electrode tab and the negative electrode tab, increasing the maximum current that can pass through the positive electrode tab and the negative electrode tab, and improving the maximum charging and discharging current of the battery. At the same time, by setting the positive electrode dressing area and the negative electrode dressing area to face each other, and the area of the positive electrode dressing area is not larger than the area of the negative electrode dressing area, when the battery is charged, the phenomenon of cation precipitation in the negative electrode dressing area is reduced or avoided, and the charging current of the battery is increased.

[0009] In some embodiments, the positive electrode tabs are provided on both opposite sides of the positive electrode sheet, the arrangement direction of the two positive electrode tabs is the first direction, the negative electrode tabs are provided on both opposite sides of the negative electrode sheet, the arrangement direction of the two negative electrode tabs is the second direction, and the first direction is perpendicular to the second direction;

[0010] The size of the positive electrode coating area along the second direction is L1, the size of the positive electrode tab along the second direction is L3, and 0 ≤ L1 - L3 ≤ 2 cm; the size of the negative electrode coating area along the first direction is L2, the size of the negative electrode tab along the first direction is L4, and 0 ≤ L2 - L4 ≤ 2 cm.

[0011] Optionally, the size of the positive electrode coating area along the first direction is H1, satisfying 0.95 ≤ L1 / H1 ≤ 1.05; the size of the negative electrode coating area along the second direction is H2, satisfying 0.95 ≤ L2 / H2 ≤ 1.05.

[0012] Further, 0.01 mm ≤ L2 - L1 ≤ 50 mm, and / or, 0.01 mm ≤ H2 - H1 ≤ 50 mm.

[0013] Further, the arrangement direction of the positive electrode tab and the positive electrode coating area is the first direction, the arrangement direction of the negative electrode tab and the negative electrode coating area is the second direction, and the first direction is perpendicular to the second direction.

[0014] The edge of the positive electrode coating area includes opposite first positive edges, each of the first positive edges extends along the first direction, the edge of the positive electrode tab includes opposite second positive edges, each of the second positive edges extends along the first direction, and the distance between the second positive edge and the adjacent first positive edge is ΔL1, 0 ≤ ΔL1 ≤ 1 cm; the edge of the negative electrode coating area includes opposite first negative edges, each of the first negative edges extends along the second direction, the edge of the negative electrode tab includes opposite second negative edges, each of the second negative edges extends along the first direction, and the distances between the second negative edge and the adjacent first negative edge are ΔL2 respectively, 0 ≤ ΔL2 ≤ 1 cm.

[0015] In some embodiments, the positive electrode tabs symmetrically arranged are provided on both opposite sides of the positive electrode coating area; the negative electrode tabs symmetrically arranged are provided on both opposite sides of the negative electrode coating area.

[0016] In some embodiments, the distance between the outer edge of the orthographic projection of the positive electrode coating area on the plane where the negative electrode coating area is located and the outer edge of the negative electrode coating area is X1, 0.5 mm ≤ X1 ≤ 10 mm.

[0017] In some embodiments, the battery cell further includes a separator disposed between the positive electrode tab and the negative electrode tab, and the positive projection of the negative electrode coating area on the plane where the separator is located is completely within the separator.

[0018] Further, the distance between the outer edge of the positive projection of the negative electrode coating area on the plane where the separator is located and the outer edge of the separator is X2, and 0.5 mm ≤ X2 ≤ 10 mm.

[0019] In some embodiments, the positive electrode tab further includes a positive electrode insulating coating provided at least on the edge of the positive electrode coating area. The covering area of the positive electrode insulating coating on the positive electrode coating area is an insulating area, and the insulating area is an annular shape extending along the edge of the positive electrode coating area. The width of the insulating area is W1, and 0.01 cm ≤ W1 ≤ 1 cm.

[0020] Further, a part of the positive electrode insulating coating is provided on the positive electrode tab at the edge of the positive electrode coating area, and the width of the positive electrode insulating coating on the positive electrode tab is W2, and 0.1 cm ≤ W1 + W2 ≤ 5 cm.

[0021] Further, the thickness of the positive electrode insulating coating is D1, and 1 μm ≤ D1 ≤ 200 μm.

[0022] The battery according to an embodiment of the present invention includes: a housing in which a receiving cavity is formed; the battery cell described in the above embodiment, and the battery cell is disposed in the receiving cavity; a positive terminal passing through the housing and electrically connected to the positive electrode tab; a negative terminal passing through the housing and electrically connected to the negative electrode tab; wherein, the positive terminal and the negative terminal are in a plate-like structure.

[0023] The battery according to an embodiment of the present invention, by adopting the battery cell of the above embodiment, can increase the maximum current at the positive electrode tab and the negative electrode tab. The positive terminal and the negative terminal are provided in a plate-like structure, so that there can be a large contact area between the positive terminal and the positive electrode tab, and a large contact area between the negative terminal and the negative electrode tab. Moreover, the positive terminal and the negative terminal themselves can have a large current-carrying area, thereby increasing the load capacity of the positive terminal and the negative terminal, and improving the maximum output current of the battery and the safety of the battery.

[0024] In some embodiments, the area of the part of the positive terminal located outside the housing is larger than the area of the part of the negative terminal located outside the housing; or, the area of the part of the positive terminal located outside the housing is smaller than the area of the part of the negative terminal located outside the housing.

[0025] A battery module according to an embodiment of the present utility model includes: at least two batteries as described in the above embodiments, and at least two of the batteries are stacked; an electrical connector, and the electrical connector is adapted to electrically connect two adjacent batteries along the stacking direction.

[0026] The battery module according to an embodiment of the present utility model, by using the battery of the above embodiment, can increase the maximum current at the positive electrode tab and the negative electrode tab, and the positive terminal and the negative terminal are arranged in a plate shape, so that there can be a large contact area between the positive terminal and the positive electrode tab, and there is a large contact area between the negative terminal and the negative electrode tab, and the positive terminal and the negative terminal themselves can have a large current-carrying area, thereby increasing the load capacity of the positive terminal and the negative terminal, improving the maximum output current and safety of the battery, and further improving the maximum output current and safety of the battery module.

[0027] In some embodiments, the projections of the positive terminals of at least two of the batteries along the stacking direction at least partially overlap, and the projections of the negative terminals of at least two of the batteries along the stacking direction at least partially overlap, and the electrical connector connects two adjacent positive terminals or two adjacent negative terminals along the stacking direction.

[0028] In some embodiments, the positive terminals and the negative terminals of different batteries among at least two of the batteries are arranged at intervals along the stacking direction, and the projections of the positive terminals and the negative terminals of different batteries along the stacking direction at least partially overlap, and the electrical connector is between the positive terminal and the negative terminal adjacent along the stacking direction; wherein, the positive terminal and the negative terminal of each battery are electrically connected to different batteries.

[0029] An electrical device according to an embodiment of the present utility model includes the battery as described in the above embodiment, or includes the battery module as described in the above embodiment.

[0030] The electrical device according to an embodiment of the present utility model, by using the battery of the above embodiment, or the battery module of the above embodiment, can increase the maximum current at the positive electrode tab and the negative electrode tab, and the positive terminal and the negative terminal are arranged in a plate shape, so that there can be a large contact area between the positive terminal and the positive electrode tab, and there is a large contact area between the negative terminal and the negative electrode tab, and the positive terminal and the negative terminal themselves can have a large current-carrying area, thereby increasing the load capacity of the positive terminal and the negative terminal, improving the maximum output current and safety of the battery, and further improving the maximum output current and safety of the electrical device.

[0031] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0033] Figure 1 is a schematic structural diagram of a battery cell according to an embodiment of the present utility model;

[0034] Figure 2 is a schematic structural diagram of a positive electrode tab according to an embodiment of the present utility model;

[0035] Figure 3 is a schematic structural diagram of a positive electrode tab according to another embodiment of the present utility model;

[0036] Figure 4 is a schematic structural diagram of a battery cell according to another embodiment of the present utility model;

[0037] Figure 5 is a three-dimensional structural diagram of a battery cell according to an embodiment of the present utility model;

[0038] Figure 6 is a schematic structural diagram of a battery according to an embodiment of the present utility model;

[0039] Figure 7 is a schematic structural diagram of a battery module according to an embodiment of the present utility model;

[0040] Figure 8 is a schematic structural diagram of a battery module according to another embodiment of the present utility model.

[0041] Reference numerals:

[0042] Battery module 2000,

[0043] Battery 1000,

[0044] Battery cell 100,

[0045] Positive electrode tab 10, positive electrode dressing area 11, first positive electrode side 111, positive electrode tab 12, second positive electrode side 121, positive electrode insulating coating 13,

[0046] Negative electrode tab 20, negative electrode dressing area 21, first negative electrode side 211, negative electrode tab 22, second negative electrode side 221,

[0047] Separator 30,

[0048] Positive terminal 200, negative terminal 300, housing 400, electrical connector 500. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals designate like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0050] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0051] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0052] The battery cell 100, battery 1000, battery module 2000 and electrical equipment according to embodiments of the utility model will be described below with reference to the accompanying drawings.

[0053] As Figure 1 shown, the battery cell 100 according to an embodiment of the present utility model includes a positive electrode tab 10 and a negative electrode tab 20. The positive electrode tab 10 includes a positive electrode coating area 11, and a positive electrode tab 12 is formed on at least one side of the positive electrode coating area 11. The negative electrode tab 20 includes a negative electrode coating area 21, and a negative electrode tab 22 is formed on at least one side of the negative electrode coating area 21.

[0054] It can be understood that when the battery 1000 is charged, cations are deintercalated from the positive electrode dressing area 11 and embedded into the negative electrode dressing area 21 through the electrolyte; when the battery 1000 is discharged, cations are deintercalated from the negative electrode dressing area 21 and embedded into the positive electrode dressing area 11 through the electrolyte. Among them, during the charging process of the battery 1000, cations are embedded into the negative electrode dressing area 21 under the drive of an external voltage, and they will encounter resistance when embedded into the negative electrode dressing area 21.

[0055] It should be noted that the part of the positive electrode plate 10 outside the positive electrode dressing area 11 forms a positive electrode tab 12, and the part of the negative electrode plate 20 outside the negative electrode dressing area 21 forms a negative electrode tab 22. In the preparation of the positive electrode plate 10 or the negative electrode plate 20, the dressing can be pre-set in the positive electrode dressing area 11 or the negative electrode dressing area 21 before cutting the positive electrode plate 10 or the negative electrode plate 20, so that the positive electrode tab 12 or the negative electrode tab 22 can be formed while cutting to obtain the positive electrode plate 10 or the negative electrode plate 20. This is beneficial to simplifying the cutting process of the positive electrode plate 10 or the negative electrode plate 20 and improving the material utilization rate.

[0056] Thus, the positive electrode plate 10 and the negative electrode plate 20 are alternately stacked, and the orthographic projection of the positive electrode dressing area 11 on the plane where the negative electrode dressing area 21 is located is completely located within the negative electrode dressing area 21, so that the positive electrode dressing area 11 can be directly opposite to the negative electrode dressing area 21, thereby reducing the resistance of cations moving from the positive electrode dressing area 11 and being embedded into the negative electrode dressing area 21, and reducing or avoiding the phenomenon of cation precipitation in the negative electrode dressing area 21.

[0057] Preferably, the area of the negative electrode dressing area 21 is larger than the area of the positive electrode dressing area 11, which can reduce the resistance encountered by cations when embedded into the negative electrode dressing area 21, and further reduce or avoid the phenomenon of cation precipitation in the negative electrode dressing area 21.

[0058] In addition, setting the projections of the positive electrode tab 12 and the negative electrode tab 22 on the plane where the negative electrode dressing area 21 is located to be spaced apart can reduce or avoid the contact between the positive electrode tab 12 and the negative electrode tab 22, thereby reducing or avoiding the risk of short circuit between the positive electrode plate 10 and the negative electrode plate 20.

[0059] For the cell 100 of the present application, by directly alternately stacking the positive electrode plate 10 and the negative electrode plate 20, the blockage of the tabs led out in the circumferential direction of the electrode plate can be reduced, which is beneficial to increasing the areas of the positive electrode tab 12 and the negative electrode tab 22, thereby increasing the over-current area of the current on the positive electrode tab 12 and the negative electrode tab 22, and increasing the maximum current that can pass through the positive electrode tab 12 and the negative electrode tab 22, so as to increase the maximum current of the battery 1000 during charging and discharging.

[0060] Meanwhile, by arranging the positive electrode dressing area 11 and the negative electrode dressing area 21 to face each other, and the area of the positive electrode dressing area 11 is not larger than that of the negative electrode dressing area 21, when the battery 1000 is charged, the phenomenon of cation precipitation in the negative electrode dressing area 21 is reduced or avoided, and the charging current of the battery 1000 is increased.

[0061] In the present application, the active materials coated on the positive electrode dressing area 11 and the negative electrode dressing area 21 are not limited. For example, the active material of the positive electrode dressing area 11 is not limited to one of the following materials: lithium phosphate with olivine structure, lithium transition metal oxide and their respective modified compounds. The active materials of the negative electrode dressing area 21 include but are not limited to one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0062] Preferably, the battery cell 100 is used in a lithium-ion battery, and the charged current carriers in the electrolyte are lithium ions.

[0063] Preferably, the shapes of the positive electrode dressing area 11 and the negative electrode dressing area 21 are rectangular.

[0064] In some embodiments, as Figure 2 shown, both opposite sides of the positive electrode tab 10 are provided with positive electrode tabs 12, and the arrangement direction of the two positive electrode tabs 12 is the first direction. As Figure 1 shown, both opposite sides of the negative electrode tab 20 are provided with negative electrode tabs 22, and the arrangement direction of the two negative electrode tabs 22 is the second direction, and the first direction is perpendicular to the second direction.

[0065] Among them, as Figure 2 shown, the dimension of the positive electrode dressing area 11 along the second direction is L1, and the dimension along the first direction is H1, and 0.95 ≤ L1 / H1 ≤ 1.05. As Figure 1 shown, the dimension of the negative electrode dressing area 21 along the first direction is L2, and the dimension along the second direction is H2, and 0.95 ≤ L2 / H2 ≤ 1.05.

[0066] It should be noted that in the Figure 2 example, the dimensions and structure of the positive electrode tab 10 are shown. For the dimensions and structure of the negative electrode tab 20, by replacing L1 with L2 and H1 with H2 in Figure 2 , the structure and dimension relationship of the negative electrode tab 20 can be obtained.

[0067] Therefore, set 0.95 ≤ L1 / H1 ≤ 1.05 and 0.95 ≤ L2 / H2 ≤ 1.05, so that the shapes of the positive electrode dressing area 11 and the negative electrode dressing area 21 are close to squares, which can facilitate the opposite setting of the positive electrode dressing area 11 and the negative electrode dressing area 21. And make the sizes of the positive electrode tab 12 and the negative electrode tab 22 relatively close, so that the current carrying capacities of the positive electrode tab 12 and the negative electrode tab 22 can be more consistent.

[0068] In addition, the dimension of the negative electrode tab 22 in the first direction is equal to or less than the dimension of the negative electrode dressing area 21 in the first direction, which can reduce or avoid the negative electrode tab 22 contacting the positive electrode tab 12 in the first direction. The dimension of the positive electrode tab 12 in the second direction is equal to or less than the dimension of the positive electrode dressing area 11, which can reduce or avoid the positive electrode tab 12 contacting the negative electrode tab 22 in the second direction. Thus, the short-circuit risk caused by the contact between the positive electrode tab 12 and the negative electrode tab 22 is further reduced.

[0069] Optionally, the dimension of the positive electrode tab 12 in the second direction is L3, and 0 ≤ L1 - L3 ≤ 2 cm.

[0070] Optionally, the dimension of the negative electrode tab 22 in the first direction is L4, and 0 ≤ L2 - L4 ≤ 2 cm.

[0071] It can be understood that in the manufacturing process of the battery cell 100, the setting positions of the positive electrode plate 10 relative to the negative electrode plate 20, as well as the dimensions of the positive electrode plate 10 and the negative electrode plate 20, are prone to errors. Therefore, set 0 ≤ L1 - L3 ≤ 2 cm and 0 ≤ L2 - L4 ≤ 2 cm, so that the dimension of the positive electrode tab 12 in the second direction and the dimension of the negative electrode tab 22 in the first direction can have error redundancy, further reducing or avoiding the short-circuit risk caused by the contact between the positive electrode tab 12 and the negative electrode tab 22.

[0072] Preferably, the first direction and the second direction are perpendicular.

[0073] Furthermore, 0.01 mm ≤ L2 - L1 ≤ 50 mm, and / or, 0.01 mm ≤ H2 - H1 ≤ 50 mm. While ensuring the reduction or avoidance of the phenomenon of cation precipitation in the negative electrode dressing area 21, the area of the positive electrode dressing area 11 can be increased.

[0074] Preferably, 0.5 mm ≤ L2 - L1 ≤ 10 mm, and / or, 0.5 mm ≤ H2 - H1 ≤ 10 mm.

[0075] Furthermore, as Figure 2 shown, the arrangement direction of the positive electrode tab 12 and the positive electrode dressing area 11 is the first direction, as Figure 1As shown, the arrangement direction of the negative electrode tab 22 and the negative electrode coating area 21 is the second direction, and the first direction is perpendicular to the second direction. The edge of the positive electrode coating area 11 includes opposite first positive electrode edges 111, each first positive electrode edge 111 extends along the first direction, the edge of the positive electrode tab 12 includes opposite second positive electrode edges 121, each second positive electrode edge 121 extends along the first direction, and the distance between the second positive electrode edge 121 and the adjacent first positive electrode edge 111 is ΔL1, where 0 ≤ ΔL1 ≤ 1 cm.

[0076] Thus, it is possible to reduce or avoid the second positive electrode edge 121 protruding from the positive electrode coating area 11 in the second direction, and the distance between the second positive electrode edge 121 and the adjacent first positive electrode edge 111 is ΔL1, where 0 ≤ ΔL1 ≤ 1 cm. An error redundancy can be formed at both ends of the positive electrode tab 12 in the second direction. While maximizing the current-carrying capacity of the positive electrode tab 12, the risk of contact between the positive electrode tab 12 and the negative electrode tab 22 caused by errors can be reduced or avoided.

[0077] Refer to Figure 1 , the edge of the negative electrode coating area 21 includes opposite first negative electrode edges 211, each first negative electrode edge 211 extends along the second direction, the edge of the negative electrode tab 22 includes opposite second negative electrode edges 221, each second negative electrode edge 221 extends along the second direction, and the distances between the second negative electrode edge 221 and the adjacent first negative electrode edges 211 are ΔL2, where 0 ≤ ΔL2 ≤ 1 cm.

[0078] Thus, it is possible to reduce or avoid the first negative electrode edge 211 protruding from the negative electrode coating area 21 in the first direction, and the distance between the first negative electrode edge 211 and the adjacent first negative electrode edge 211 is ΔL2, where 0 ≤ ΔL2 ≤ 1 cm. An error redundancy can be formed at both ends of the negative electrode tab 22 in the first direction. While maximizing the current-carrying capacity of the negative electrode tab 22, the risk of contact between the positive electrode tab 12 and the negative electrode tab 22 caused by errors can be reduced or avoided.

[0079] In some embodiments, as Figures 1-5 shown, symmetrically arranged positive electrode tabs 12 are provided on opposite sides of the positive electrode coating area 11. Symmetrically arranged negative electrode tabs 22 are provided on opposite sides of the negative electrode coating area 21. Thus, it is beneficial for the shapes of the two positive electrode tabs 12 to be consistent, and the shapes of the two negative electrode tabs 22 to be consistent, thereby improving the current consistency on the two positive electrode tabs 12 and the two negative electrode tabs 22.

[0080] In some embodiments, the positive electrode dressing area 11 is orthogonally projected onto the surface where the negative electrode dressing area 21 is located, and the distance between the outer edge of the projection and the outer edge of the negative electrode dressing area 21 is X1, where 0.5 mm ≤ X1 ≤ 10 mm. Thus, while reducing the resistance of cation insertion into the negative electrode dressing area 21, it is possible to ensure that there is sufficient facing area between the positive electrode dressing area 11 and the negative electrode dressing area 21, ensuring the speed of cation insertion or extraction from the positive electrode dressing area 11, and thus ensuring the magnitude of the charge and discharge current of the battery 1000.

[0081] In some embodiments, as Figure 4 shown, the battery cell 100 further includes a separator 30. The separator 30 can reduce or avoid contact between the positive electrode plate 10 and the negative electrode plate 20 while allowing charged current-carrying particles to pass through the separator 30.

[0082] Thus, the separator 30 is disposed between the positive electrode plate 10 and the negative electrode plate 20, and the orthogonal projection of the negative electrode dressing area 21 onto the surface where the separator 30 is located is completely within the separator 30, which can reduce or avoid the risk of short circuit caused by contact between the positive electrode plate 10 and the negative electrode plate 20.

[0083] Preferably, the surface of the separator 30 is provided with a PVDF adhesive coating or an alumina ceramic coating, etc.

[0084] Furthermore, the orthogonal projection of the negative electrode dressing area 21 onto the surface where the separator 30 is located, the distance between the outer edge of the projection and the outer edge of the separator 30 is X2, where 0.5 mm ≤ X2 ≤ 10 mm.

[0085] Thus, X2 ≤ 10 mm can reduce or avoid the influence of the separator 30 on the size of the battery cell 100, and 0.5 mm ≤ X2 allows for a certain error range in the setting position of the separator 30 relative to the negative electrode plate 20, simplifying the setting of the separator 30 in the battery cell 100.

[0086] In some embodiments, as Figure 3 shown, the positive electrode plate 10 further includes a positive electrode insulating coating 13. The positive electrode insulating coating 13 is at least provided on the edge of the positive electrode dressing area 11. The coverage area of the positive electrode insulating coating 13 on the positive electrode dressing area 11 is an insulating area, and the insulating area is an annular shape extending along the edge of the positive electrode dressing area 11. The width of the insulating area is W1, where 0.01 cm ≤ W1 ≤ 1 cm.

[0087] Thus, the positive electrode insulating coating 13 can further limit the area of the positive electrode dressing area 11 for inserting or extracting charged current-carrying particles, and is wrapped around the edge position of the positive electrode dressing area 11, which can reduce or avoid the insertion or extraction of charged current-carrying particles from the edge of the positive electrode dressing area 11 in a direction away from the negative electrode dressing area 21, and improve the efficiency of the movement of charged current-carrying particles between the positive electrode dressing area 11 and the negative electrode dressing area 21.

[0088] In this application, the material of the positive electrode insulating coating 13 is not limited, and it is preferably a material with high insulation and low dielectric constant. For example, the positive electrode insulating coating 13 is mainly composed of a ceramic material with high insulation and low dielectric constant, and a polymer material with high insulation and low dielectric constant is used as the binder. Among them, the ceramic material may include, but is not limited to, alumina, hydrated or modified oxides mainly composed of alumina, titanium oxide, hydrated or modified oxides mainly composed of titanium oxide. The binder may include, but is not limited to, at least one of vinylidene fluoride, polytetrafluoroethylene, vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, and fluorinated acrylate resin.

[0089] Further, a part of the positive electrode insulating coating 13 is provided on the positive electrode tab 12 at the edge of the positive electrode dressing area 11. The width of the positive electrode insulating coating 13 on the positive electrode tab 12 is W2, and 0.1 cm ≤ W1 + W2 ≤ 5 cm. Thus, when the area of the positive electrode dressing area 11 is smaller than the area of the negative electrode dressing area 21, the positive electrode tab 12 is opposite to the negative electrode dressing area 21 at a position close to the positive electrode dressing area 11, so that the positive electrode insulating coating 13 can protect the positive electrode tab 12 to isolate the positive electrode tab 12 from the negative electrode dressing area 21.

[0090] In addition, since there are multiple positive electrode tabs 12 stacked in the battery cell 100, the thickness of the positive electrode insulating coating 13 is set to D1 (not shown in the figure), and 1 μm ≤ D1 ≤ 200 μm. While ensuring that the positive electrode insulating coating 13 completely covers the edge of the positive electrode dressing area 11, it can maintain the thickness consistency of the positive electrode plate 10 and reduce or avoid the influence of the thickness of the positive electrode insulating coating 13 on the overall thickness of the battery cell 100.

[0091] As Figure 6 shown, the battery 1000 according to an embodiment of the present invention includes a housing 400, a battery cell 100, a positive terminal 200, and a negative terminal 300. A receiving cavity is formed in the housing 400. The battery cell 100 is the battery cell 100 of the above embodiment, and the battery cell 100 is disposed in the receiving cavity. The positive terminal 200 passes through the housing 400 and is electrically connected to the positive electrode tab 12, and the negative terminal 300 passes through the housing 400 and is electrically connected to the negative electrode tab 22. Among them, the positive terminal 200 and the negative terminal 300 are plate-like structures.

[0092] The battery 1000 of the present application can increase the maximum current at the positive electrode tab 12 and the negative electrode tab 22 by adopting the battery cell 100 of the above embodiment. The positive terminal 200 and the negative terminal 300 are arranged in a plate shape, so that a large contact area can be provided between the positive terminal 200 and the positive electrode tab 12, and a large contact area can be provided between the negative terminal 300 and the negative electrode tab 22. Moreover, the positive terminal 200 and the negative terminal 300 themselves can have a large current-carrying area, thereby increasing the load capacity of the positive terminal 200 and the negative terminal 300, improving the maximum output current of the battery 1000 and the safety of the battery 1000.

[0093] In some embodiments, as Figure 8 shown, the area of the part of the positive terminal 200 outside the housing 400 is larger than the area of the part of the negative terminal 300 outside the housing 400. Alternatively, the area of the part of the positive terminal 200 outside the housing 400 is smaller than the area of the part of the negative terminal 300 outside the housing 400.

[0094] Thus, the different areas of the parts of the positive terminal 200 and the negative terminal 300 outside the housing 400 can facilitate the distinction between the positive terminal 200 and the negative terminal 300, thereby facilitating the distinction between the positive terminal 200 and the negative terminal 300 and improving the accuracy during the electrical connection operation of the positive terminal 200 and the negative terminal 300.

[0095] As Figure 7 、 Figure 8 shown, the battery module 2000 according to an embodiment of the present invention includes: an electrical connector 500 and at least two batteries 1000 of the above embodiment. The at least two batteries 1000 are stacked, and among them, the electrical connector 500 electrically connects two adjacent batteries 1000 along the stacking direction.

[0096] The battery module 2000 of the present application can increase the maximum current at the positive electrode tab 12 and the negative electrode tab 22 by adopting the battery 1000 of the above embodiment. The positive terminal 200 and the negative terminal 300 are arranged in a plate shape, so that a large contact area can be provided between the positive terminal 200 and the positive electrode tab 12, and a large contact area can be provided between the negative terminal 300 and the negative electrode tab 22. Moreover, the positive terminal 200 and the negative terminal 300 themselves can have a large current-carrying area, thereby increasing the load capacity of the positive terminal 200 and the negative terminal 300, improving the maximum output current and safety of the battery 1000, and further improving the maximum output current and safety of the battery module 2000.

[0097] Preferably, the electrical connector 500 has a plate-like structure, enabling a large contact area between the electrical connector 500, the positive electrode electrons, and the negative terminal 300. Moreover, the electrical connector 500 itself can have a large current-carrying area, thereby increasing the load capacity of the electrical connector 500 and improving the maximum output current and safety of the battery module 2000.

[0098] In some embodiments, as Figure 7 shown, the projections of the positive terminals 200 of at least two batteries 1000 along the stacking direction coincide, and the projections of the negative terminals 300 of at least two batteries 1000 along the stacking direction coincide. The electrical connector 500 connects two adjacent positive terminals 200 or two adjacent negative terminals 300 along the stacking direction. It can be understood that the positive terminals 200 of at least two batteries 1000 are connected by the electrical connector 500, and the negative terminals 300 of at least two batteries 1000 are connected by the electrical connector 500, forming a parallel connection between at least two batteries 1000. Moreover, it can simplify the electrical connection paths between the positive terminals 200 and between the negative terminals 300, reducing the volume of the electrical connector 500.

[0099] In some embodiments, as Figure 8 shown, among at least two batteries 1000, the positive terminals 200 and negative terminals 300 of different batteries 1000 are arranged at intervals along the stacking direction, and the projections of the positive terminals 200 and negative terminals 300 of different batteries 1000 along the stacking direction at least partially coincide. The electrical connector 500 connects the positive terminal 200 and the negative terminal 300 adjacent along the stacking direction.

[0100] Among them, the positive terminal 200 and the negative terminal 300 of each battery 1000 are electrically connected to different batteries 1000, forming a series connection between at least two batteries 1000. At the same time, it can reduce the electrical connection path between the positive terminal 200 and the corresponding negative terminal 300, reducing the volume of the electrical connector 500.

[0101] In some embodiments, multiple battery modules 2000 are electrically connected. Among them, multiple battery modules 2000 are connected in series, or multiple battery modules 2000 are connected in parallel. Or multiple battery modules 2000 are connected in series to form a battery unit, and multiple battery units are connected in parallel. Or multiple battery modules 2000 are connected in parallel to form a battery unit, and multiple battery units are connected in series.

[0102] The electrical equipment according to the embodiment of the present invention includes the battery 1000 of the above embodiment, or includes the battery module 2000 of the above embodiment.

[0103] The electrical device of the present application can increase the maximum current at the positive electrode tab and the negative electrode tab by adopting the battery 1000 of the above embodiment or the battery module 2000 of the above embodiment. The positive terminal and the negative terminal are arranged in a plate shape, so that there can be a large contact area between the positive terminal and the positive electrode tab, and there can be a large contact area between the negative terminal and the negative electrode tab. Moreover, the positive terminal and the negative terminal themselves can have a large current-carrying area, thereby increasing the load capacity of the positive terminal and the negative terminal, improving the maximum output current and safety of the battery 1000, and further improving the maximum output current and safety of the electrical device.

[0104] For those of ordinary skill in the art, the other components and operations of the battery cell 100, the battery 1000, the battery module 2000 and the electrical device according to the embodiments of the present invention are known, and will not be described in detail here.

[0105] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0106] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A positive electrode sheet, the positive electrode sheet comprising a positive electrode dressing area, at least one side of the positive electrode dressing area forming a positive electrode ear; A negative electrode plate, the negative electrode plate comprising a negative electrode dressing area, at least one side of the negative electrode dressing area forming a negative electrode tab; The positive electrode sheets and the negative electrode sheets are alternately stacked, and the orthographic projection of the positive electrode dressing area on the surface where the negative electrode dressing area is located is completely located in the negative electrode dressing area; The projections of the positive electrode tab and the negative electrode tab on the surface where the negative electrode dressing area is located are spaced apart.

2. The battery cell according to claim 1, characterized in that: The positive electrode tabs are disposed on opposite sides of the positive electrode sheet, and the arrangement direction of the two positive electrode tabs is a first direction; the negative electrode tabs are disposed on opposite sides of the negative electrode sheet, and the arrangement direction of the two negative electrode tabs is a second direction, and the first direction is perpendicular to the second direction; The size of the positive electrode dressing area along the second direction is L1, the size of the positive electrode tab along the second direction is L3, and 0≤L1-L3≤2cm; The dimension of the negative electrode dressing area along the first direction is L2, the dimension of the negative electrode tab along the first direction is L4, and 0≤L2-L4≤2cm.

3. The battery cell according to claim 2, characterized in that: The dimension of the positive electrode dressing area along the first direction is H1, satisfying 0.95≤L1 / H1≤1.05; The dimension of the negative electrode dressing area along the second direction is H2, satisfying 0.95≤L2 / H2≤1.

05.

4. The battery cell according to claim 2, characterized in that: 0.01mm≤L2-L1≤50mm, and / or, 0.01mm≤H2-H1≤50mm.

5. The battery cell according to claim 1, characterized in that: The arrangement direction of the positive electrode tab and the positive electrode dressing area is a first direction, the arrangement direction of the negative electrode tab and the negative electrode dressing area is a second direction, and the first direction is perpendicular to the second direction; The edge of the positive electrode dressing area includes opposite first positive electrode edges, each of which is extended along the first direction, and the edge of the positive electrode ear includes opposite second positive electrode edges, each of which is extended along the first direction, and the distance between the second positive electrode edge and the adjacent first positive electrode edge is ΔL1, 0≤ΔL1≤1cm; The edge of the negative electrode dressing area includes relative first negative electrode edges, each of which extends along the second direction. The edge of the negative electrode ear includes relative second negative electrode edges, each of which extends along the second direction. The distance between the second negative electrode edge and the adjacent first negative electrode edge is ΔL2, 0≤ΔL2≤1cm.

6. The battery cell according to claim 1, characterized in that: The positive electrode ears are symmetrically arranged on opposite sides of the positive electrode dressing area; The negative electrode tabs are symmetrically arranged on opposite sides of the negative electrode dressing area.

7. The battery cell according to claim 1, characterized in that: The distance between the outer edge of the orthographic projection of the positive electrode dressing area on the surface where the negative electrode dressing area is located and the outer edge of the negative electrode dressing area is X1, 0.5mm≤X1≤10mm.

8. The battery cell according to claim 1, characterized in that: It also includes a diaphragm, which is arranged between the positive electrode plate and the negative electrode plate, and the positive projection of the negative electrode dressing area on the surface where the diaphragm is located is completely located in the diaphragm.

9. The battery cell according to claim 8, characterized in that: The distance between the outer edge of the positive projection of the negative electrode dressing area on the surface where the diaphragm is located and the outer edge of the diaphragm is X2, 0.5mm≤X2≤10mm.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The positive electrode plate also includes a positive electrode insulating coating, which is at least arranged on the edge of the positive electrode dressing area. The covering area of ​​the positive electrode insulating coating on the positive electrode dressing area is an insulating area. The insulating area is a ring extending along the edge of the positive electrode dressing area. The width of the insulating area is W1, 0.01cm≤W1≤1cm.

11. The battery cell according to claim 10, characterized in that: A portion of the positive electrode insulating coating is disposed on the positive electrode tab at the edge of the positive electrode dressing area, and a width of the positive electrode insulating coating on the positive electrode tab is W2, 0.1 cm≤W1+W2≤5 cm.

12. The battery cell according to claim 11, characterized in that: The thickness of the positive electrode insulating coating is D1, 1 μm≤D1≤200 μm.

13. A battery, characterized in that: include: A housing, wherein a receiving cavity is formed in the housing; The battery cell according to any one of claims 1 to 12, wherein the battery cell is arranged in the accommodating cavity; A positive terminal, the positive terminal is disposed through the shell and is electrically connected to the positive electrode tab; A negative terminal, the negative terminal is passed through the shell and is electrically connected to the negative electrode tab; Wherein, the positive terminal and the negative terminal are plate-shaped structures.

14. The battery according to claim 13, characterized in that The area of ​​the positive terminal located outside the shell is larger than the area of ​​the negative terminal located outside the shell; Alternatively, the area of ​​the positive terminal located outside the shell is smaller than the area of ​​the negative terminal located outside the shell.

15. A battery module, characterized in that: include: At least two batteries according to any one of claims 13 to 14, at least two of the batteries being stacked; An electrical connector, wherein the electrical connector is suitable for electrically connecting two batteries adjacent to each other in a stacking direction.

16. The battery module according to claim 15, characterized in that: The projections of the positive terminals of at least two of the batteries along the stacking direction overlap, the projections of the negative terminals of at least two of the batteries along the stacking direction overlap, and the electrical connector connects two adjacent positive terminals or two adjacent negative terminals along the stacking direction.

17. The battery module according to claim 15, characterized in that: The positive terminals and the negative terminals of different batteries in at least two of the batteries are arranged at intervals along the stacking direction, the projections of the positive terminals and the negative terminals of different batteries along the stacking direction at least partially overlap, and the positive terminals and the negative terminals of the electrical connectors are adjacent to each other along the stacking direction; The positive terminal and the negative terminal of each battery are electrically connected to different batteries.

18. An electrical equipment, characterized in that: The method comprises a battery as claimed in any one of claims 13 to 14, or a battery module as claimed in any one of claims 15 to 17.

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