Battery cell structure, secondary battery and electric equipment

Abstract

The invention belongs to the technical field of battery cell pole pieces, and particularly relates to a battery cell structure, a secondary battery and electric equipment. The battery cell structure comprises a naked battery cell body and at least one tab body, the tab body comprises a first tab piece and at least two second tab pieces which have the same polarity; one side end of the first tab piece is connected to the naked battery cell body; one side end of each second tab piece is connected to the naked battery cell body; the first tab and all the second tabs are arranged side by side along the thickness direction of the naked battery cell body; and the length of the first tab piece and the lengths of all the second tab pieces are sequentially increased along the thickness direction of the naked battery cell body. According to the invention, the stability of welding assembly can be improved, so that the stability and smoothness of production and processing of the cell structure are guaranteed; and the use safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field, and in particular relates to a battery cell structure, a secondary battery and an electrical device. Background Art

[0002] Competition in the new energy market is becoming increasingly fierce. Power lithium batteries and energy storage batteries are developing rapidly, and they will compete in price wars in the future. In order to survive in the price war, companies pay more attention to the manufacturing process and manufacturing costs of battery cells. At present, in the manufacturing process of bare battery cells, companies generally design the tabs to be the same length as the exposed tabs.

[0003] However, the same length of the ear will be folded after super welding, and the length of each layer will be different, resulting in layer misalignment; it may even cause the ear to be incompletely welded during super welding and exceed the weld mark; thus reducing the stability of the overall assembly and affecting the safety of use. Summary of the invention

[0004] The purpose of the present invention is to provide a battery core structure to solve the technical problem of poor stability of the overall assembly in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A battery cell structure comprises a bare battery cell body and at least one pole ear body; the pole ear body comprises a first pole ear sheet and at least one second pole ear sheet with the same polarity; one side end of the first pole ear sheet is connected to the bare battery cell body; one side end of each second pole ear sheet is connected to the bare battery cell body; the first pole ear sheet and all the second pole ear sheets are arranged side by side along the thickness direction of the bare battery cell body; and the length of the first pole ear sheet and the length of all the second pole ear sheets increase successively along the thickness direction of the bare battery cell body.

[0007] Preferably, when all the second pole tab sheets are folded toward the first pole tab sheet, one side end of each second pole tab sheet away from the bare cell body is aligned with one side end of the first pole tab sheet away from the bare cell body.

[0008] Preferably, each of the second pole tabs comprises a folded section and a horizontal section connected to each other; the folded section is connected to the bare cell body;

[0009] When all the second pole tabs are folded toward the first pole tab, each folded segment is folded obliquely toward the first pole tab; all the horizontal segments are stacked on one side surface of the first pole tab; and all the horizontal segments are aligned away from one side end of the folded segment; all the horizontal segments are aligned close to one side end of the folded segment.

[0010] Preferably, the first pole ear sheet includes a welding section and a connecting section; the connecting section is connected to the bare battery cell body; the welding section and the connecting section are horizontally connected; and all the folding sections are inclined toward one side surface of the connecting section; all the horizontal sections are stacked on one side surface of the welding section.

[0011] Preferably, the bare cell body comprises an isolation film, a first pole piece and a second pole piece; the isolation film is arranged between the first pole piece and the second pole piece; and the polarity of the first pole piece is opposite to the polarity of the second pole piece;

[0012] The electrode tab body includes a positive electrode tab and a negative electrode tab; the negative electrode tab is connected to the first electrode sheet; and the positive electrode tab is connected to the second electrode sheet.

[0013] Preferably, in the negative electrode ear, the relationship between the length L1 of the first electrode ear sheet, the length c of the horizontal section, the length d of the folded section in the positive projection direction, the thickness H3 of the separator and the thickness H4 of a single active material layer in the second electrode sheet satisfies:

[0014] And / or, the relationship between the length of the second pole tab of the nth layer Ln, the length of the horizontal segment c, the length of the folded segment in the positive projection direction d, the thickness b of the first pole piece, the thickness H3 of the isolation film and the thickness H4 of a single active material layer in the second pole piece satisfies:

[0015]

[0016] Preferably, in the positive electrode tab, the relationship between the length M1 of the first electrode tab sheet, the length c of the horizontal segment, the length d of the folded segment in the positive projection direction, the thickness H3 of the separator and the thickness H5 of a single active material layer in the first electrode sheet satisfies:

[0017] And / or, the relationship between the length of the first pole tab of the nth layer Mn, the length of the horizontal segment c, the length of the folded segment in the positive projection direction d, the thickness of the second pole piece a, the thickness of the isolation film H3 and the thickness of a single active material layer H4 in the first pole piece satisfies:

[0018]

[0019] Preferably, the battery cell structure further includes a transition component; the transition component is connected to the first pole tab sheet; or the transition component is connected to the second pole tab sheet.

[0020] The invention also discloses a secondary battery, comprising the battery core structure described above.

[0021] The invention also discloses an electric device, comprising the secondary battery.

[0022] The beneficial effect of the present invention is that the technical solution can solve the problem of excessive misalignment between the first pole ear sheet and the second pole ear sheet during the pole ear welding process by setting the pole ear body at the side end of the bare battery cell body as an incremental gradient structure, thereby helping to improve the stability of the welding assembly between the first pole ear sheet and the second pole ear sheet, thereby ensuring the stability and smoothness of the production and processing of the battery cell structure; and improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following will refer to the attached Figures 1 to 5 To describe the features, advantages and technical effects of exemplary embodiments of the present invention.

[0024] Figure 1 It is a structural schematic diagram of a battery cell structure according to an embodiment of the present invention;

[0025] Figure 2 A partial cross-sectional view of a battery cell structure according to an embodiment of the present invention;

[0026] Figure 3 A schematic structural diagram of a tab body of a battery cell structure according to an embodiment of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the assembled state of the battery cell structure of one embodiment of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the assembled state of a battery cell structure according to another embodiment of the present invention.

[0029] In the figure: 1-bare cell body; 101-isolation film; 102-first pole piece; 103-second pole piece; 2-ear body; 21-first pole ear piece; 201-positive pole ear; 202-negative pole ear; 211-welding section; 212-connecting section; 22-second pole ear piece; 221-folding section; 222-horizontal section; 4-transfer component; 41-assembly section; 42-splicing section. DETAILED DESCRIPTION

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and multiple situations exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] The following is combined with Figure 1 to Figure 5 The present invention is further described in detail, but is not intended to limit the present invention.

[0036] like Figure 1 and 2 As shown, in one embodiment of the present invention, the battery cell structure comprises a bare battery cell body 1 and at least one tab body 2; the tab body 2 comprises a first tab sheet 21 and at least two second tab sheets 22 with the same polarity; one side end of the first tab sheet 21 is connected to the bare battery cell body 1; one side end of each second tab sheet 22 is connected to the bare battery cell body 1; the first tab sheet 21 and all the second tab sheets 22 are arranged side by side along the thickness direction of the bare battery cell body 1; and the length of the first tab sheet 21 and the length of all the second tab sheets 22 increase successively along the thickness direction of the bare battery cell body 1. Among them, the bare battery cell body 1 can be a laminated battery cell or a wound battery cell.

[0037] The technical solution of the present invention can help solve the problem of excessive misalignment between the first pole ear sheet and the second pole ear sheet during the pole ear welding process by setting the pole ear body at the side end of the bare battery cell body 1 as an incremental gradual structure, thereby helping to improve the stability of the welding assembly between the first pole ear sheet and the second pole ear sheet, thereby ensuring the stability and smoothness of the production and processing of the battery cell structure; and improving the safety of use.

[0038] Specifically, in some embodiments, Figure 1 and 2 As shown, when all the second pole tabs 22 are folded toward the first pole tab 21, the side end of each second pole tab 22 away from the bare cell body 1 is aligned with the side end of the first pole tab 21 away from the bare cell body 1. That is to say, by increasing the first pole tab and the second pole tab of the gradual structure, and aligning the outer ends of the second pole tab 22 and the first pole tab 21 during assembly, it is possible to avoid the waste of raw materials caused by the exposed part of the folded second pole tab 22, and avoid the assembly blank area of ​​the exposed second pole tab 22, resulting in poor laser welding with external connection components and poles; thereby improving the stability of the welding assembly between the first pole tab and the second pole tab.

[0039] Specifically, in some embodiments, Figure 2 and 3 As shown, each of the second pole tabs 22 includes a folding section 221 and a horizontal section 222 connected to each other; the folding section 221 is connected to the bare cell body 1; when all the second pole tabs 22 are folded toward the first pole tab 21, each folding section 221 is tilted and folded toward the first pole tab 21; all the horizontal sections 222 are stacked on one side surface of the first pole tab 21; and all the horizontal sections 222 are aligned away from the side ends of the folding section 221; all the horizontal sections 222 are aligned close to the side ends of the folding section 221. In other words, the left and right ends of the horizontal section 222 are aligned to each other, so that the problem of the pole tab misalignment after the pole tab is super-welded and folded can be effectively solved; and the assembly flatness between all the horizontal sections 222 and the first pole tab 21 is achieved, thereby avoiding the horizontal section 222 from being exposed for a long time and wasting raw materials, and avoiding the assembly blank area of ​​the exposed horizontal section 222, which leads to poor laser welding with external connection components and poles; thus improving the stability of the welding assembly between the first pole tab and the second pole tab.

[0040] Specifically, in some embodiments, Figure 2 and 3As shown, the first electrode tab 21 includes a welding section 211 and a connecting section 212; the connecting section 212 is connected to the bare cell body 1; the welding section 211 and the connecting section 212 are horizontally connected; and all folding sections 221 are inclined toward one side surface of the connecting section 212; all horizontal sections 222 are stacked on one side surface of the welding section 211. Figure 2 As shown, when all the second pole tabs 22 are folded toward the first pole tab 21, the projection of each horizontal segment 222 toward the welding segment 211 is overlapped with the welding segment 211; and / or, the projection of each folding segment 221 toward the connecting segment 212 is overlapped with the connecting segment 212. That is to say, by aligning the welding segment 211 with the horizontal segment 222 and aligning the folding segment 221 with the connecting segment 212, the problem of misalignment of the pole tabs after the pole tabs are super-welded and folded can be further and better solved, and the assembly flatness between the first pole tab 21 and the second pole tab 22 can be guaranteed, thereby avoiding the horizontal segment 222 from being exposed for a long time and wasting raw materials, and avoiding the assembly blank area of ​​the exposed horizontal segment 222, which leads to poor laser welding with external connecting components and poles; thus, the stability of the welding assembly between the first pole tab and the second pole tab is improved.

[0041] Specifically, in some embodiments, Figure 1 and 2 As shown, the bare cell body 1 includes an isolation film 101, a first pole piece 102 and a second pole piece 103; the isolation film 101 is disposed between the first pole piece 102 and the second pole piece 103; and the polarity of the first pole piece 102 is opposite to the polarity of the second pole piece 103; the pole ear body 2 is connected to the first pole piece 102 and / or the second pole piece 103. Figure 2 and 4 As shown or Figure 2 and 5 As shown, there are two tab bodies 2, which are respectively a positive tab 201 and a negative tab 202; the positive tab 201 and the negative tab 202 each include a first tab sheet 21 and at least two second tab sheets 22 with the same polarity; and the negative tab 202 is connected to the first tab 102; and the positive tab 201 is connected to the second tab 103.

[0042] Specifically, in some embodiments, Figure 2 As shown, the relationship between the thickness a of the second pole piece 103 (negative electrode), the thickness H1 of the current collector in the second pole piece 103 (negative electrode), and the thickness H4 of a single active material layer in the second pole piece 103 (negative electrode) satisfies: a=H1+2*H4. The relationship between the thickness b of the first pole piece 102 (positive electrode), the thickness H2 of the current collector in the first pole piece 102 (positive electrode), and the thickness H5 of a single active material layer in the first pole piece 102 (positive electrode) satisfies: b=H2+2*H5.

[0043] Specifically, in some embodiments, Figure 2 As shown, when all the second pole tabs 22 are folded toward the first pole tab 21, the relationship between the length c of the welding section 211 or the horizontal section 222 and the length d in the positive projection direction of the folding section 221 or the connecting section 212 satisfies: c = (2-4) * d. Among them, it can be: c = 2 * d; c = 3 * d; c = 4 * d; c = 2.5 * d; c = 3.5 * d, etc. This structure can further improve the assembly stability between the external connectors through the appropriate size relationship between c and b, and ensure the folding length to avoid material waste.

[0044] Specifically, in some embodiments, Figure 2 and 3 As shown, in the negative electrode 202, the length of the first electrode tab 21 is L1, the lengths of the second electrode tab 22 close to the first electrode tab 21 and all the second electrode tabs 22 far from the first electrode tab 21 are L2, L3, L4...Ln respectively; that is, the relationship between the length of the first electrode tab 21 is L1, the thickness H3 of the isolation film 101 and the thickness H4 of a single active material layer in the second electrode 103 (negative electrode) satisfies: The length of the second pole tab 22 of the nth layer is Ln, the thickness b of the first pole piece 102 (positive electrode), the thickness H3 of the isolation film 101 and the thickness H4 of a single active material layer in the second pole piece 103 (negative electrode) satisfy the following relationship:

[0045] That is to say, after the bare cell body 1 (including the core winding hot pressing) is formed, it is super-welded with the external connector. This design is based on the super-welding platform and the bottom of the core being at the same level, that is, the lower surface of the tab is flush with the lower surface of the core after the tab is super-welded and folded; and the tab folding inflection point is the outer edge of the adapter in the same vertical axis or on the edge of the super-welding mark.

[0046] Specifically, in some embodiments (not shown), in the positive electrode tab 201, the length of the first electrode tab 21 is M1, the lengths of the second electrode tab 22 close to the first electrode tab 21 and all the second electrode tabs 22 far from the first electrode tab 21 are M2, M3, M4, ..., Mn, respectively; that is, the relationship between the length of the first electrode tab 21 is M1, the thickness H3 of the isolation film 101 and the thickness H5 of a single active material layer in the first electrode sheet 102 (positive electrode) satisfies: The relationship between the length of the first pole tab 21 of the nth layer Mn, the thickness a of the second pole piece 103 (negative electrode), the thickness H3 of the isolation film 101 and the thickness H4 of a single active material layer in the first pole piece 102 (positive electrode) satisfies:

[0047] That is to say, after the bare cell body 1 (including the core winding hot pressing) is formed, it is super-welded with the external connector. This design is based on the super-welding platform and the bottom of the core being at the same level, that is, the lower surface of the tab is flush with the lower surface of the core after the tab is super-welded and folded; and the tab folding inflection point is the outer edge of the adapter in the same vertical axis or on the edge of the super-welding mark.

[0048] The material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon or silicon, etc. The material of the isolation film 101 may be PP (polypropylene) or PE (polyethylene), etc.

[0049] Specifically, in some embodiments, Figure 2 As shown, the cell structure further includes a transition component 4 ; the transition component 4 is connected to the first pole tab 21 ; or the transition component 4 is connected to the second pole tab 22 .

[0050] Among them, Figure 2 and 4 As shown, in some embodiments, the transition component 4 is connected to the first pole piece 21 (middle welding section 211); that is, the two side ends of the transition component 4 are respectively welded to the corresponding welding sections 211 in two different battery cell structures to realize the assembly of two different battery cell structures as a whole, so as to achieve assembly stability. Further, the transition component 4 includes an assembly portion 41 and a splicing portion 42 connected to the two side ends of the assembly portion 41; the other side end of the splicing portion 42 extends to the junction between the welding section 211 and the connecting section 212. This structure can ensure the welding coverage area, improve assembly stability, and reduce the impact of abutment damage on the folded part.

[0051] Among them, Figure 5 As shown, in some embodiments, the transition component 4 is connected to the second pole piece 22 (middle horizontal section 222). That is, the two side ends of the transition component 4 are respectively welded to the corresponding horizontal sections 222 in two different battery cell structures to realize the assembly of two different battery cell structures as a whole, so as to achieve the stability of the assembly. Further, the transition component 4 includes an assembly portion 41 and a splicing portion 42 connected to the two side ends of the assembly portion 41; the other side end of the splicing portion 42 extends to the junction between the horizontal section 222 and the folding section 221. This structure can ensure the welding coverage area, improve the assembly stability, and reduce the impact of abutment damage on the folding section 221.

[0052] The present invention further provides a secondary battery, which includes a cell structure. The specific structure of the cell structure refers to the above embodiments. Since the secondary battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0053] Among them, secondary battery (Rechargeable battery) is also called rechargeable battery or storage battery, which refers to a battery that can be used to activate the active material by charging after the battery is discharged. A new battery can be built by using the reversibility of chemical reactions, that is, after a chemical reaction is converted into electrical energy, the chemical system can be repaired by electrical energy, and then converted into electrical energy by chemical reaction again, so it is called a secondary battery (rechargeable battery). The main rechargeable batteries on the market are nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead storage) batteries, lithium-ion batteries, polymer lithium-ion batteries, etc. The most common secondary battery is the lead storage battery, which is composed of two groups of grid-shaped plates arranged alternately, the positive plate is covered with PbO2, the negative plate is covered with Pb, and the electrolyte is H2SO4 solution.

[0054] The present invention also proposes an electrical device, which includes a secondary battery. The specific structure of the secondary battery refers to the above embodiment. Since the electrical device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0055] Among them, the 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, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, 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 special restrictions on the above-mentioned electrical equipment.

[0056] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0057] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs can also change and modify the above embodiment. Therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present invention belongs to the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A battery cell structure, characterized in that: It includes a bare battery cell body and at least one pole ear body; the pole ear body includes a first pole ear sheet and at least one second pole ear sheet with the same polarity; one side end of the first pole ear sheet is connected to the bare battery cell body; one side end of each second pole ear sheet is connected to the bare battery cell body; the first pole ear sheet and all the second pole ear sheets are arranged side by side along the thickness direction of the bare battery cell body; and the length of the first pole ear sheet and the length of all the second pole ear sheets increase successively along the thickness direction of the bare battery cell body.

2. The battery cell structure according to claim 1, characterized in that: When all the second pole tab sheets are folded toward the first pole tab sheet, one side end of each second pole tab sheet away from the bare battery cell body is aligned with one side end of the first pole tab sheet away from the bare battery cell body.

3. The battery cell structure according to claim 1, characterized in that: Each of the second pole tabs comprises a folded section and a horizontal section connected to each other; the folded section is connected to the bare cell body; When all the second pole tabs are folded toward the first pole tab, each folded segment is folded obliquely toward the first pole tab; all the horizontal segments are stacked on one side surface of the first pole tab; and all the horizontal segments are aligned away from one side end of the folded segment; all the horizontal segments are aligned close to one side end of the folded segment.

4. The battery cell structure according to claim 3, characterized in that: The first pole ear sheet includes a welding section and a connecting section; the connecting section is connected to the bare battery cell body; the welding section and the connecting section are horizontally connected; and all the folding sections are inclined toward one side surface of the connecting section; all the horizontal sections are stacked on one side surface of the welding section.

5. The battery core structure according to claim 3 or 4, characterized in that: The bare cell body comprises an isolation film, a first pole piece and a second pole piece; the isolation film is arranged between the first pole piece and the second pole piece; and the polarity of the first pole piece is opposite to the polarity of the second pole piece; The electrode tab body includes a positive electrode tab and a negative electrode tab; the negative electrode tab is connected to the first electrode sheet; and the positive electrode tab is connected to the second electrode sheet.

6. The battery cell structure according to claim 5, characterized in that: In the negative electrode ear, the relationship between the length L1 of the first electrode ear sheet, the length c of the horizontal section, the length d of the folded section in the positive projection direction, the thickness H3 of the separator and the thickness H4 of a single active material layer in the second electrode sheet satisfies: And / or, the relationship between the length of the second pole tab of the nth layer Ln, the length of the horizontal segment c, the length of the folded segment d, the thickness b of the first pole piece, the thickness H3 of the isolation film and the thickness H4 of a single active material layer in the second pole piece satisfies:

7. The battery cell structure according to claim 5, characterized in that: In the positive electrode tab, the relationship between the length M1 of the first electrode tab sheet, the length c of the horizontal segment, the length d of the folded segment in the positive projection direction, the thickness H3 of the separator and the thickness H5 of a single active material layer in the first electrode sheet satisfies: And / or, the relationship between the length of the first pole tab of the nth layer Mn, the length of the horizontal segment c, the length of the folded segment in the positive projection direction d, the thickness of the second pole piece a, the thickness of the isolation film H3 and the thickness of a single active material layer H4 in the first pole piece satisfies:

8. The battery core structure according to claim 1, 2, 3 or 4, characterized in that: The battery cell structure further includes a transition component; the transition component is connected to the first pole tab sheet; or the transition component is connected to the second pole tab sheet.

9. A secondary battery, characterized in that: The battery cell structure comprises any one of claims 1 to 8.

10. An electrical equipment, characterized in that: A secondary battery comprising the secondary battery according to claim 9.

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