Battery cell structure, battery and electric device

Abstract

The utility model discloses a kind of electric core structure, battery and electric equipment, electric core structure includes pole piece and tab. Pole piece has empty foil area. Tab includes exposed part and inner connecting part connected with each other, exposed part is suitable for connecting protection circuit, and inner connecting part connects empty foil area. Among them, inner connecting part includes first connecting part and second connecting part, first connecting part is welded with pole piece, second connecting part is bonded with pole piece, and second connecting part is located at the outside of first connecting part. The scheme can be auxiliary to improve the connection strength of tab and pole piece by bonding, reduce the welding strength requirement, effectively reduce the situation that base material is broken down by overwelding, avoid the situation that tab and pole piece welding tension cannot be met by less welding, guarantee the stability and reliability of tab and pole piece assembly connection, improve battery performance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell structure, battery, and electrical equipment. Background Technology

[0002] As the battery industry develops, the requirements for battery energy density are becoming increasingly stringent. Related technologies improve energy density by reducing the thickness of battery materials. However, as the substrate, especially copper-aluminum foil substrates, becomes thinner, the requirements for the consistency and tensile strength of battery welding also increase. For example, controlling the tensile strength of thin copper foil substrates (4μm or even 3μm in the future) presents significant challenges. To meet the existing tensile strength requirements, welding power needs to be increased; however, excessive welding power can damage the substrate. Reducing the welding power, on the other hand, fails to meet the corresponding tensile strength requirements, resulting in poor welding performance between the electrode tabs and the substrate in the battery cell. Utility Model Content

[0003] The main purpose of this utility model is to propose a cell structure, battery and electrical equipment, which aims to solve the technical problem of poor welding effect between the tab and the substrate in the cell.

[0004] To achieve the above objectives, a first aspect of this utility model provides a battery cell structure, comprising:

[0005] The electrode has an empty foil region;

[0006] The electrode includes an exposed portion and an internal portion connected to each other, the exposed portion being adapted to connect to a protection circuit, and the internal portion connecting to the empty foil area;

[0007] The inner connection portion includes a first connection portion and a second connection portion. The first connection portion is welded to the electrode sheet, and the second connection portion is bonded to the electrode sheet. The second connection portion is located outside the first connection portion.

[0008] In some embodiments, the cell structure includes conductive adhesive, which is adapted to be applied to the side of the second connection portion facing the electrode to bond the second connection portion to the electrode.

[0009] The second connecting portion is arranged around the first connecting portion, and the coating width of the conductive adhesive is D, wherein the conductive adhesive satisfies: 0.5mm≤D≤3mm.

[0010] In some embodiments, the tab includes a first side located on the outer side, the conductive adhesive extends beyond the first side, the extension length of the conductive adhesive beyond the first side is L1, and the conductive adhesive satisfies: 1mm≤L1≤2mm.

[0011] In some embodiments, the thickness of the inner connecting portion is H1, the thickness of the exposed portion is H2, the width of the inner connecting portion is K1, the width of the exposed portion is K2, and the tab satisfies: H1 < H2, and K1 > K2.

[0012] In some embodiments, the thickness of the inner connecting portion and the thickness of the exposed portion satisfy the following condition: 1 / 4 ≤ H1 / H2 ≤ 3 / 4;

[0013] The width of the inner connecting part and the width of the exposed part satisfy the condition: 1 / 4≤K2 / K1≤3 / 4.

[0014] In some embodiments, the connecting portion satisfies: 0.02mm≤H1≤0.4mm, 4mm≤K1≤8mm;

[0015] The exposed portion satisfies the following conditions: 0.08mm≤H2≤0.3mm, 1mm≤K2≤6mm.

[0016] In some embodiments, the tab includes an adapter portion, the adapter portion including a first end and a second end arranged opposite to each other, the first end being connected to the inner connection portion, the second end being connected to the exposed portion, and the width of the first end being greater than the width of the second end.

[0017] In some embodiments, the width of the transition portion gradually decreases from the first end to the second end, the width of the first end is equal to the width of the inner connection portion, the width of the second end is equal to the width of the exposed portion, and the thickness of the transition portion is between the thickness of the inner connection portion and the thickness of the exposed portion.

[0018] A second aspect of this utility model provides a battery, which includes the cell structure described in the above embodiments.

[0019] A third aspect of this utility model provides an electrical device, which includes the battery described in the above embodiments.

[0020] Compared with the prior art, the beneficial effects of this utility model include:

[0021] In the technical solution of this utility model, the cell structure includes an electrode sheet and a tab. The electrode sheet has an empty foil area. The tab includes an exposed portion and an internal connecting portion that are interconnected. The exposed portion is used to connect to the protection circuit, and the internal connecting portion connects to the empty foil area. In the prior art, as the substrate, especially the copper-aluminum foil substrate, becomes thinner, the requirements for the consistency of battery welding and the welding pull force are also becoming increasingly stringent. For example, for thin copper foil substrates of 4μm or even 3μm thickness in the future, there is a great challenge in controlling the welding pull force. If the original welding pull force is to be met, the welding power needs to be increased. However, excessive welding power will break through the substrate, while reducing the welding power will not meet the corresponding welding pull force requirements, that is, the welding effect between the tab and the substrate of the cell is poor. The internal connection of this solution includes a first connection part and a second connection part. The first connection part is welded to the electrode sheet, and the second connection part is bonded to the electrode sheet. The second connection part is located outside the first connection part. That is, this solution can help improve the connection strength between the tab and the electrode sheet by bonding, reduce the welding strength requirement, effectively reduce the situation where the substrate is broken down due to over-welding, avoid the situation where the welding pull of the tab and the electrode sheet cannot be met due to insufficient welding, ensure the stability and reliability of the assembly connection between the tab and the electrode sheet, and improve battery performance. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a top view of the electrode tab in one embodiment of the present invention; wherein, the electrode tab is coated with conductive adhesive and electrode tab adhesive;

[0024] Figure 2 for Figure 1 A magnified view of a portion of point A; multiple solder joints are shown.

[0025] Figure 3 This is a side view of the electrode tab in one embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of a battery tab strip coated with conductive adhesive in one embodiment of the present invention; wherein the tab strip is not cut.

[0027] Explanation of icon numbers:

[0028] Electrode 10;

[0029] Exposed portion 100;

[0030] Internal connecting part 200; first connecting part 210; solder joint 211; second connecting part 220;

[0031] Adapter 300; First end 310; Second end 320;

[0032] First side 400;

[0033] Conductive adhesive 20;

[0034] Ear gel 30.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] The first aspect of this utility model provides a battery cell structure that ensures the stability and reliability of the assembly connection between the tab 10 and the electrode sheet. See below for reference. Figures 1 to 4 The following describes the cell structure according to an embodiment of this application. Specifically, the cell structure includes an electrode and a tab 10.

[0038] It is understood that in some embodiments, the electrode can be an anode plate, which serves as the negative electrode of the battery cell. In other embodiments, the electrode can be a cathode plate, which serves as the positive electrode of the battery cell. In still other embodiments, the electrode can include both an anode plate and a cathode plate. It should be noted that the foil materials of both the anode plate and the cathode plate can be coated with active materials, and the exposed metal foil areas on the electrode foil materials that are not coated with active materials are called bare foil areas (also known as blank foil areas or uncoated areas).

[0039] Reference Figure 1 and Figure 3 The tab 10 is used to electrically connect the electrode plate to an external circuit. The tab 10 can collect the current generated by the active material on the electrode plate and conduct the current to the electrode post, which in turn delivers it to the external circuit. The tab 10 includes an exposed portion 100 and an internal connection portion 200. The exposed portion 100 and the internal connection portion 200 are connected to each other. It should be noted that the exposed portion 100 can be connected to a protection circuit (PCM board, Protection Circuit Module Board). The internal connection portion 200 can be connected to an empty foil area.

[0040] The specific connection arrangement between the internal connection portion 200 and the electrode sheet is described below. Specifically, the internal connection portion 200 includes a first connection portion 210 and a second connection portion 220, with the second connection portion 220 located outside the first connection portion 210. (Refer to...) Figure 1 In terms of orientation, the first connecting part 210 can be located inside the electrode tab 10, and the second connecting part 220 can be located outside the electrode tab 10. It should be noted that the first connecting part 210 can be welded to the electrode sheet, and the second connecting part 220 can be bonded to the electrode sheet.

[0041] In the technical solution of this utility model, the cell structure includes an electrode sheet and a tab 10. The electrode sheet has an empty foil area. The tab 10 includes an exposed portion 100 and an internal connecting portion 200 connected to each other. The exposed portion 100 is used to connect a protection circuit, and the internal connecting portion 200 connects to the empty foil area. In the prior art, as the substrate, especially the copper-aluminum foil substrate, becomes thinner, the requirements for the consistency of battery welding and the welding pull force are also becoming higher. For example, for thin copper foil substrates of 4μm or even 3μm thickness in the future, there is a great challenge in controlling the welding pull force. If the original welding pull force is to be met, the welding power needs to be increased. However, excessive welding power will break through the substrate, while reducing the welding power will not meet the corresponding welding pull force requirements, that is, the welding effect between the tab and the substrate of the cell is poor. The internal connection portion 200 of this solution includes a first connection portion 210 and a second connection portion 220. The first connection portion 210 is welded to the electrode sheet, and the second connection portion 220 is bonded to the electrode sheet. The second connection portion 220 is located outside the first connection portion 210. That is, this solution can help improve the connection strength between the tab 10 and the electrode sheet by bonding, reduce the welding strength requirement, effectively reduce the situation where the substrate is broken down due to over-welding, avoid the situation where the welding pull force between the tab 10 and the electrode sheet cannot be met due to insufficient welding, ensure the stability and reliability of the assembly connection between the tab 10 and the electrode sheet, and improve battery performance.

[0042] Reference Figure 1 and Figure 3 The specific bonding arrangement between the tab 10 and the electrode sheet is described below. In some embodiments, the cell structure includes conductive adhesive 20, which can be applied to the side of the second connecting portion 220 facing the electrode sheet, so that the second connecting portion 220 can be bonded to the electrode sheet. It should be noted that the conductive adhesive 20 can be a modified epoxy resin-based conductive adhesive 20, with a curing temperature of around 80°C. The conductive adhesive 20 can effectively improve the overall conductivity of the tab 10.

[0043] The relative arrangement of the second connecting portion 220 and the first connecting portion 210 is described below. In some embodiments, the second connecting portion 220 can be arranged around the first connecting portion 210, which can further improve the stability of the connection between the tab 10 and the electrode. The coating width of the conductive adhesive 20 is D, wherein the conductive adhesive 20 satisfies: 0.5mm ≤ D ≤ 3mm. For example, D can be 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 2.7mm or 3mm, etc., and the specific coating width of the conductive adhesive 20 can be determined according to the actual situation. The conductive adhesive 20 of this solution adopts the above-mentioned coating width, which can avoid the problem of insufficient bonding effect provided by the conductive adhesive 20 due to the coating width being too narrow, and can also avoid the situation where the coating width is too wide affecting the welding of the tab 10 and the electrode. While reducing the welding strength requirements of the tab 10 and the electrode, it improves the reliability and stability of the connection between the tab 10 and the electrode, and reduces the welding difficulty.

[0044] The following describes the application position of the conductive adhesive 20 on the tab 10. In some embodiments, for ease of description and understanding, the structure of the tab 10 is first explained. Specifically, the tab 10 includes a first side 400 located on the outer side, as shown in the figure. Figure 1 The first side 400 can be the lower side of the tab 10, the left side of the tab 10, or the right side of the tab 10. This embodiment uses the lower side of the tab 10 as an example. The conductive adhesive 20 can extend beyond the first side 400, meaning it can be applied beyond the side of the tab 10. The extension length of the conductive adhesive 20 beyond the first side 400 is L1, and the conductive adhesive 20 satisfies the condition: 1mm ≤ L1 ≤ 2mm. For example, L1 can be 1mm, 1.2mm, 1.5mm, 1.7mm, 1.9mm, or 2mm, etc. This solution can further improve the stability and reliability of the assembly connection between the tab 10 and the electrode sheet.

[0045] The relative dimensions of the internal connection portion 200 and the exposed portion 100 are described below. In some embodiments, the thickness of the internal connection portion 200 is H1, and the thickness of the exposed portion 100 is H2. The tab 10 satisfies the condition that H1 < H2, meaning that the thickness of the internal connection portion 200 in this solution is less than the thickness of the exposed portion 100. Compared to solutions where both have the same thickness, this solution can effectively reduce the volume of internal battery materials by reducing the thickness of the internal connection portion 200, and can accommodate more active materials within the same volume, thereby increasing the battery energy density.

[0046] In some embodiments, the width of the inner connection portion 200 is K1, the width of the exposed portion 100 is K2, and the tab 10 satisfies: K1 > K2, that is, in this solution, the width of the inner connection portion 200 is greater than that of the exposed portion 100. Compared with solutions where both widths are the same, this solution can ensure the connection strength between the tab 10 and the electrode by increasing the width of the inner connection portion 200, thus ensuring the conductivity and mechanical strength of the battery cell structure.

[0047] The relative thickness settings of the inner connecting portion 200 and the exposed portion 100 in the tab 10 are described below. In some embodiments, the thickness of the inner connecting portion 200 and the thickness of the exposed portion 100 satisfy the condition: 1 / 4 ≤ H1 / H2 ≤ 3 / 4. For example, H1 / H2 can be 1 / 4, 3 / 8, 1 / 2, 5 / 8, or 3 / 4, etc. In this solution, the thickness of the inner connecting portion 200 and the exposed portion 100 meets the above-mentioned size range, which can take into account both the requirements of cell energy density and the connection strength between the tab 10 and the electrode, thereby improving cell performance.

[0048] The relative width settings of the inner connecting portion 200 and the exposed portion 100 in the tab 10 are described below. In some embodiments, the thickness of the inner connecting portion 200 and the width of the exposed portion 100 satisfy the condition: 1 / 4 ≤ K2 / K1 ≤ 3 / 4. For example, K2 / K1 can be 1 / 4, 3 / 8, 1 / 2, 5 / 8, or 3 / 4, etc. In this solution, the widths of the inner connecting portion 200 and the exposed portion 100 satisfy the above-mentioned size range, which can take into account both the requirements of cell energy density and the connection strength between the tab 10 and the electrode sheet, thereby improving cell performance.

[0049] Reference Figure 1 and Figure 3 The specific dimensions of the connecting portion 200 are described below. In some embodiments, the thickness of the connecting portion 200 satisfies the following condition: 0.02mm ≤ H1 ≤ 0.4mm. For example, H1 can be 0.02mm, 0.05mm, 0.08mm, 0.1mm, 0.14mm, 0.2mm, 0.25mm, 0.33mm, 0.37mm, or 0.4mm, etc. The width of the connecting portion 200 satisfies the following condition: 4mm ≤ K1 ≤ 8mm. For example, K1 can be 4mm, 4.2mm, 4.5mm, 5mm, 5.6mm, 5.8mm, 6mm, 6.5mm, 7mm, 7.7mm, or 8mm, etc.

[0050] Reference Figure 1 and Figure 3The specific dimensions of the exposed portion 100 are described below. In some embodiments, the thickness of the exposed portion 100 satisfies the following condition: 0.08mm ≤ H2 ≤ 0.3mm. For example, H2 can be 0.08mm, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.21mm, 0.24mm, or 0.3mm, etc. The width of the exposed portion 100 satisfies the following condition: 1mm ≤ K2 ≤ 6mm. For example, K2 can be 1mm, 1.5mm, 1.8mm, 2.3mm, 2.5mm, 3mm, 3.3mm, 3.7mm, 4mm, 4.5mm, 5mm, 5.8mm, or 6mm, etc.

[0051] The specific configuration of the adapter 300 is described below. In some embodiments, the electrode 10 includes an adapter 300, which includes a first end 310 and a second end 320 arranged opposite to each other, as shown below. Figure 2 In terms of orientation, the first end 310 can be the lower end of the adapter 300, and the second end 320 can be the upper end of the adapter 300. The first end 310 is used to connect to the inner part 200, and the second end 320 is used to connect to the exposed part 100. The width of the first end 310 can be greater than the width of the second end 320. The adapter 300 of this solution can effectively avoid right-angle stress concentration and realize stress buffering and current transition of the tab 10 structure.

[0052] The specific structural configuration of the adapter portion 300 is described below. Along the direction from the first end 310 to the second end 320, the width of the adapter portion 300 gradually decreases. Specifically, in some embodiments, the structure of the adapter portion 300 can have a trapezoidal transition. In other embodiments, the structure of the adapter portion 300 can have an arc-shaped transition. The specific structural configuration of the adapter portion 300 can be determined according to the actual situation; this application embodiment uses a trapezoidal transition as an example for explanation. It should be noted that the width of the first end 310 can be equal to the width of the inner connecting portion 200, the width of the second end 320 can be equal to the width of the exposed portion 100, and the thickness of the adapter portion 300 can be between the thickness of the inner connecting portion 200 and the thickness of the exposed portion 100.

[0053] Reference Figure 1 and Figure 2The specific configuration of the tab adhesive 30 is described below. In some embodiments, the battery cell structure includes tab adhesive 30, which is applied to the adapter portion 300. The coating thickness of the tab adhesive 30 is C, wherein the tab adhesive 30 satisfies: 0.1mm ≤ C ≤ 0.3mm. Exemplarily, C can be 0.1mm, 0.15mm, 0.17mm, 0.2mm, 0.23mm, 0.25mm, 0.28mm, or 0.3mm, etc. In this solution, the tab adhesive 30 can block the conductive path between the tab 10 and the steel shell or cover plate, and form a molecular-level bond with the aluminum-plastic film through hot pressing, absorbing the vibration stress of the tab 10, reducing the risk of metal fatigue fracture, and achieving insulation sealing, mechanical buffering, and thermal protection for the battery cell.

[0054] It should be noted that in some embodiments, the tab 10 can be a positive tab 10, the exposed portion 100 of the positive tab 10 can be made of aluminum or nickel, and the inner connecting portion 200 of the positive tab 10 can be made of aluminum. In other embodiments, the tab 10 can be a negative tab 10, the exposed portion 100 of the negative tab 10 can be made of nickel, and the inner connecting portion 200 of the negative tab 10 can be made of nickel or copper. In other embodiments, the height of the tab adhesive 30 can be G1, the height of the adapter portion 300 can be G2, and the tab adhesive 30 and the adapter portion 300 satisfy the condition: 0.8 ≤ G1 / G2 ≤ 1.5. For example, G1 / G2 can be 0.8, 0.95, 1, 1.2, 1.44, or 1.5, etc. The specific relative height setting of the tab adhesive 30 and the adapter portion 300 can be determined according to the actual situation.

[0055] The connection principle between the tab 10 and the electrode sheet according to an embodiment of this application is described below. After the tab 10 in the battery is welded to the electrode sheet, the conductive adhesive 20 does not immediately dissolve and bond with the substrate. It only dissolves and bonds with the substrate when the battery is baked at 85°C before electrolyte injection. After the battery is removed from the oven and placed at room temperature, the conductive adhesive 20 will cure again. After curing, the battery can be disassembled for an overall tensile strength test of the tab 10. This solution adopts the above-mentioned cell structure. For cells with thin substrate design, it is not necessary to consider excessive welding power to meet the corresponding welding tensile strength requirements. It is only necessary to meet 60% to 90% of the welding power (or 60% to 80% of the welding tensile strength). This ensures that the substrate is not welded through, avoiding over-welding when welding an excessively thin substrate. The remaining 10% to 40% of the welding tensile strength can be provided by the adhesive force of the conductive adhesive 20, and the conductive adhesive 20 itself is also conductive, which can greatly increase the overall conductivity of the tab 10.

[0056] A second aspect of this utility model provides a battery, which includes the cell structure described in the above embodiment. The internal connection portion 200 of this solution includes a first connection portion 210 and a second connection portion 220. The first connection portion 210 is welded to the electrode sheet, and the second connection portion 220 is bonded to the electrode sheet. The second connection portion 220 is located outside the first connection portion 210. That is, this solution, through bonding, can help improve the connection strength between the tab 10 and the electrode sheet, reduce the welding strength requirement, effectively reduce the situation where over-welding causes the substrate to be broken down, and avoid the situation where insufficient welding leads to insufficient welding pull force between the tab 10 and the electrode sheet. This ensures the stability and reliability of the assembly connection between the tab 10 and the electrode sheet, and improves battery performance.

[0057] A third aspect of this utility model provides an electrical device, which includes the battery described in the above embodiment. The battery is used to power the electrical device. It is understood that the electrical device can be a mobile phone, tablet computer, laptop computer, battery-powered toy, power tool, or electric vehicle, etc., and the specific application depends on the actual situation. The battery in this solution can ensure the stability and reliability of the electrical device's operation.

[0058] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0059] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where A and B are simultaneously satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0060] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A cell structure, characterized in that, include: The electrode has an empty foil region; The electrode includes an exposed portion and an internal portion connected to each other, the exposed portion being adapted to connect to a protection circuit, and the internal portion connecting to the empty foil area; The inner connection portion includes a first connection portion and a second connection portion. The first connection portion is welded to the electrode sheet, and the second connection portion is bonded to the electrode sheet. The second connection portion is located outside the first connection portion.

2. The cell structure as described in claim 1, characterized in that, The cell structure includes conductive adhesive, which is adapted to be coated on the side of the second connection portion facing the electrode to bond the second connection portion to the electrode. The second connecting portion is arranged around the first connecting portion, and the coating width of the conductive adhesive is D, wherein the conductive adhesive satisfies: 0.5mm≤D≤3mm.

3. The cell structure as described in claim 2, characterized in that, The tab includes a first side located on the outer side, and the conductive adhesive extends beyond the first side. The extension length of the conductive adhesive beyond the first side is L1, and the conductive adhesive satisfies the condition: 1mm≤L1≤2mm.

4. The cell structure as described in claim 1, characterized in that, The thickness of the inner connecting part is H1, the thickness of the exposed part is H2, the width of the inner connecting part is K1, the width of the exposed part is K2, and the tab satisfies: H1 < H2, and K1 > K2.

5. The cell structure as described in claim 4, characterized in that, The thickness of the inner connecting part and the thickness of the exposed part satisfy the following condition: 1 / 4 ≤ H1 / H2 ≤ 3 / 4; The width of the inner connecting part and the width of the exposed part satisfy the condition: 1 / 4≤K2 / K1≤3 / 4.

6. The cell structure as described in claim 4, characterized in that, The internal connection satisfies the following conditions: 0.02mm≤H1≤0.4mm, 4mm≤K1≤8mm; The exposed portion satisfies the following conditions: 0.08mm≤H2≤0.3mm, 1mm≤K2≤6mm.

7. The cell structure as described in claim 1, characterized in that, The electrode includes a connecting portion, which includes a first end and a second end arranged opposite to each other. The first end is connected to the inner connecting portion, and the second end is connected to the exposed portion. The width of the first end is greater than the width of the second end.

8. The cell structure as described in claim 7, characterized in that, Along the first end to the second end, the width of the transition portion gradually decreases. The width of the first end is equal to the width of the inner connecting portion, the width of the second end is equal to the width of the exposed portion, and the thickness of the transition portion is between the thickness of the inner connecting portion and the thickness of the exposed portion.

9. A battery, characterized in that, Includes the cell structure as described in any one of claims 1-8.

10. Electrical equipment, characterized in that, Includes the battery as described in claim 9.

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