Battery cell and battery

Abstract

The utility model discloses a kind of electric core and battery, the electric core includes: roll core, including mutually laminated winding setting first pole piece, diaphragm and second pole piece, the second pole piece and the first pole piece polarity is opposite;Wherein, the current collector of the first pole piece is set with coating area in its thickness direction one surface, the coating area is coated with adhesive layer, the adhesive layer is exposed to the outside of the roll core after the first pole piece winding, to adhere battery shell.The utility model electric core is placed in battery shell, directly through the adhesive layer of outside side and battery shell adhesion, compared with traditional double-sided adhesive paste mode, avoid additional thickness space occupation, under the condition that battery overall volume is limited, more effective space is released for electric core, to directly improve the energy density of electric core, help to improve battery performance.

Description

Technical Field

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

[0002] Lithium-ion batteries, which contain lithium elements (including metallic lithium, lithium alloys, lithium ions, lithium polymers, etc.) in an electrochemical system, are widely used in consumer electronics and other fields due to their outstanding advantages such as high energy density, long cycle life and low self-discharge rate.

[0003] Lithium batteries typically consist of a battery casing and battery cells located inside the casing. In related technologies, to effectively reduce the relative movement between the battery cells and the battery casing and improve the reliability and stability of the battery under external forces such as drops and collisions, the industry generally adopts the method of attaching double-sided tape to the surface of the battery cells to achieve bonding and fixation between the battery cells and the inner wall of the battery casing.

[0004] However, the double-sided tape attached to the outside of the battery cell takes up extra space due to the thickness of the battery. Given the limited overall volume of the battery, this undoubtedly compresses the effective space of the battery cell, which in turn reduces the energy density of the battery cell and affects battery performance. Utility Model Content

[0005] The main purpose of this utility model is to propose a battery cell that aims to solve the technical problem of low energy density caused by the current use of double-sided adhesive to fix the battery cell and battery casing, which occupies extra thickness space.

[0006] To achieve the above objectives, this utility model proposes a battery cell, which includes: The core includes a first electrode, a diaphragm, and a second electrode arranged in a stacked and wound manner, wherein the second electrode has the opposite polarity to the first electrode. In this embodiment, the current collector of the first electrode has a coating area on one surface in its thickness direction. The coating area is coated with an adhesive layer, which is exposed on the outer side of the winding core after the first electrode is wound, and is used to bond the battery casing.

[0007] Optionally, the coating area is further coated with an insulating layer, which is located on at least one side of the adhesive layer in the circumferential direction.

[0008] Optionally, the insulating layer includes a first insulating layer and a second insulating layer; In the width or length direction of the first electrode, the first insulating layer and the second insulating layer are respectively disposed on opposite sides of the adhesive layer.

[0009] Optionally, the insulating layer includes a third insulating layer; In the circumferential direction of the adhesive layer, the third insulating layer surrounds the adhesive layer.

[0010] Optionally, the insulating layer includes a fourth insulating layer, and the number of the fourth insulating layer and the adhesive layer are both multiple; In the width or length direction of the first electrode, a plurality of the fourth insulating layers and a plurality of the adhesive layers are arranged alternately.

[0011] Optionally, the area ratio of the adhesive layer to the outer surface is A1, and the area ratio of the insulating layer to the outer surface is A2, wherein A1 and A2 satisfy: 3 / 7 ≤ A1 / A2 ≤ 7 / 3.

[0012] Optionally, the thickness of the adhesive layer is H1, and the thickness of the insulating layer is H2, wherein H1 and H2 satisfy: 2μm≤H1≤6μm, 1μm≤H2≤3μm.

[0013] Optionally, the thickness difference between the thickness H1 of the adhesive layer and the thickness H2 of the insulating layer is H0, wherein H0 satisfies: 0μm≤H0≤4μm; The area of ​​the adhesive layer is S1, the area of ​​the insulating layer is S2, and H0, S1 and S2 satisfy: 0.043≤H0 / (S2 / S1)≤9.

[0014] Optionally, the insulating layer is a ceramic layer.

[0015] Optionally, the width of the core is W2, and the width of the adhesive layer is W1 in the width or length direction of the first electrode sheet, wherein W1 and W2 satisfy: 0.3≤W1 / W2≤0.7.

[0016] This utility model also proposes a battery comprising a battery casing and a battery cell as described above, wherein the battery cell is disposed in the battery casing.

[0017] In this utility model of battery cell, the core is composed of a first electrode, a separator, and a second electrode arranged in a stacked and wound manner. By setting a coating area on one surface of the current collector of the first electrode in its thickness direction, and coating an adhesive layer on the coating area, the adhesive layer is exposed on the outer side of the core along its thickness direction after the first electrode is wound. When the battery cell is placed in the battery case, it is directly bonded to the battery case through the adhesive layer on the outer side. Compared with the traditional double-sided adhesive method, it avoids the occupation of additional thickness space. Under the condition of limited overall battery volume, it frees up more effective space for the battery cell, thereby directly improving the energy density of the battery cell and helping to improve battery performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the battery cell structure in one embodiment of the present invention; Figure 2This is a schematic diagram of the battery cell structure in another embodiment of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure of the first pole piece of the winding core in the embodiment; Figure 4 for Figure 3 A schematic diagram of the structure of the first pole piece of the winding core in the embodiment from another perspective; Figure 5 This is a schematic diagram of the battery cell structure in another embodiment of the present invention; Figure 6 for Figure 5 A schematic diagram of the structure of the first pole piece of the winding core in the embodiment; Figure 7 for Figure 6 A schematic diagram of the structure of the first pole piece of the winding core in the embodiment from another perspective; Figure 8 This is a schematic diagram of the battery cell structure in another embodiment of the present invention; Figure 9 This is a schematic diagram of the battery cell structure in another embodiment of the present invention; Explanation of icon numbers: 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

[0019] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0022] Furthermore, the use of terms such as "first" and "second" in this utility model is 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] This utility model embodiment proposes a battery cell, referring to... Figures 1 to 4 The battery cell includes: The core 100 includes a first electrode 110, a diaphragm 120, and a second electrode 130 that are stacked and wound together, wherein the second electrode 130 has the opposite polarity to the first electrode 110. In this embodiment, the current collector 1101 of the first electrode 110 has a coating area on one surface in the thickness direction, and the coating area is coated with an adhesive layer 111. The adhesive layer 111 is exposed on the outer side of the core 100 after the first electrode 110 is wound, and is used to bond the battery case.

[0024] The battery cell involved in this embodiment is used in a battery. The battery includes a battery casing, and the battery cell is disposed in the battery casing for encapsulation. The battery casing can be an aluminum-plastic film. The core 100, as the basic structure of the battery cell, is formed by stacking and winding a first electrode 110, a separator 120, and a second electrode 130 in a specific order. The second electrode 130 has the opposite polarity to the first electrode 110. Specifically, the first electrode 110 can be the anode electrode (i.e., the negative electrode), and the second electrode 130 can be the cathode electrode (i.e., the positive electrode), but is not limited to this. The anode electrode serves as the source of lithium ions during battery discharge, where lithium ion insertion and extraction reactions occur during charging and discharging. The cathode electrode is the storage location for lithium ions during charging and the receiving location for lithium ions during discharging. The separator 120 is located between the anode and cathode electrodes, playing a crucial role in isolating the positive and negative electrodes to prevent direct contact and short circuits, while simultaneously allowing lithium ions to pass through, ensuring the smooth progress of the electrochemical reaction. Both the first electrode 110 and the second electrode 130 include a current collector and an active material layer coated on the current collector, but the materials used for the current collector and the active material layer are different.

[0025] In the thickness direction of the current collector 1101 of the first electrode 110, the current collector 1101 has two opposing surfaces, one of which is provided with a coating area that extends along the width direction of the current collector 1101 to its two side edges. Specifically, the first electrode 110 includes a current collector 1101 and an active material layer 1102 disposed on the current collector 1101. The coating area is disposed independently of the area where the active material layer 1102 is located to coat the adhesive layer 111. In commonly used adhesive tape, the adhesive tape includes a substrate layer (i.e., a base) and an adhesive layer disposed on the substrate layer. The substrate layer serves to support the adhesive layer, while the adhesive layer is used for bonding with external objects. Optionally, the adhesive layer 111 used in this embodiment is the same material as the adhesive layer in the adhesive tape. The adhesive layer 111 can be made of reactive polyurethane, which is prepolymerized by reacting polyester polyol (20%~45%), polyether polyol (10%~30%), and diisocyanate (13%~25%). Alternatively, it can be replaced with modified polyolefin materials such as maleic anhydride-grafted polyolefin or ethylene-acrylic acid copolymer. The choice can be made according to actual needs, and this embodiment does not impose any restrictions on this.

[0026] like Figure 3 and Figure 4 As shown, one end of the first electrode 110 is the initial winding end located on the innermost ring of the winding core 100 after winding, and the other end is the final winding end located on the outermost ring of the winding core 100 after winding, wherein the adhesive layer 111 is disposed adjacent to the final winding end. Figure 2 As shown, when the first electrode 110, diaphragm 120, and second electrode 130 are stacked and wound into a core 100, the outermost ring of the core 100 exposes the first electrode 110, and the adhesive layer 111 on the current collector 1101 of the first electrode 110 is correspondingly exposed on the outer surface of the core 100. Specifically, the portion of the first electrode 110 at the outermost ring of the core 100 may be an uncoated foil area, and the coated area is located within this uncoated foil area and coated with the adhesive layer 111. Specifically, the outer surface of the core 100 is composed of multiple sides, including two straight sides opposite each other in the thickness direction of the core 100 and two corner sides opposite each other in the width direction of the core 100. The two corner sides and the two straight sides are alternately arranged along the winding direction of the core 100. The adhesive layer 111 can be exposed on one or more sides or all sides of the outer surface. For example, the adhesive layer 111 can be exposed on one straight side or two straight sides, or on one straight side and two corner sides, or on one corner side and two straight sides, etc., depending on actual needs. During the assembly of the battery cell into the casing, the core 100 is tightly bonded to the inner wall of the battery casing through the adhesive layer 111, ensuring that the battery cell is firmly fixed inside the battery casing. During the charging and discharging process of the battery, even if subjected to external forces, it can effectively limit the relative movement between the battery cell and the battery casing, ensuring the stability of the battery structure and thus ensuring the normal progress of the electrochemical reaction.

[0027] In this embodiment, the battery cell can be directly bonded to the battery casing via the adhesive layer 111 on the outer side. Compared with the traditional double-sided adhesive method, this avoids the additional thickness space occupation. Under the condition of limited overall battery volume, it frees up more effective space for the battery cell, thereby directly improving the energy density of the battery cell and helping to improve battery performance.

[0028] In some embodiments, refer to Figure 2 and Figure 3 The coating area is also coated with an insulating layer 112, which is located on at least one side of the adhesive layer 111 in the circumferential direction. Specifically, in the coating area on one surface of the first electrode 110 in the thickness direction, in addition to filling the adhesive layer 111, an insulating layer 112 is also provided. In the circumferential direction of the adhesive layer 111, the insulating layer 112 is located on one or more sides of the adhesive layer 111, and is coated together with the adhesive layer 111 in the coating area, and their projections in the thickness direction of the first electrode 110 do not overlap.

[0029] After the first electrode 110, separator 120, and second electrode 130 are stacked and wound together to form a core 100, the insulating layer 112 and the adhesive layer 111 are exposed on the outer surface of the core 100, and together they cover the outer surface area of ​​the core 100. The adhesive layer 111 is used to bond and fix the cell to the battery casing, while the insulating layer 112 performs a crucial insulating and protective function, working with other components of the cell to ensure stable battery operation. During the charging and discharging process of a lithium battery, potential differences exist between electrodes and between electrodes and other conductive components. Accidental contact between components can easily lead to abnormal current conduction, causing short-circuit faults. In this embodiment, by providing an insulating layer 112 on one or more sides of the adhesive layer 111, components with different potentials can be selectively isolated. For example, when the adhesive layer 111 firmly bonds the cell to the inner wall of the battery casing, the insulating layer 112 can effectively block direct contact between the current collector of the first electrode 110 and other conductive components, forming a reliable insulating barrier. Even when the battery is subjected to external forces such as squeezing or vibration, causing slight displacement of the internal structure, the insulating layer 112 can continue to play an isolating role, avoiding the risk of short circuit and greatly improving the electrical safety of the battery.

[0030] In some embodiments, refer to Figure 2 and Figure 5 The insulating layer 112 includes a first insulating layer 1121 and a second insulating layer 1122; In the width or length direction of the first electrode 110, the first insulating layer 1121 and the second insulating layer 1122 are respectively disposed on opposite sides of the adhesive layer 111.

[0031] In this embodiment, as Figure 3 , Figure 4 , Figure 6and Figure 7 As shown, the insulating layer 112 specifically consists of a first insulating layer 1121 and a second insulating layer 1122, which are symmetrically distributed along the width or length direction of the first electrode 110 and respectively disposed on opposite sides of the adhesive layer 111. Within the coating area, the first insulating layer 1121, the adhesive layer 111, and the second insulating layer 1122 are coated sequentially, and their projections along the thickness direction of the first electrode 110 are independent and do not overlap. The dimensions of the first insulating layer 1121 and the second insulating layer 1122 can be the same or different, depending on actual requirements. Optionally, in the width direction of the first electrode 110, the width of the first electrode 110 is W1, and the width of the adhesive layer 111 is L1, satisfying: 0.3W1≤L1≤0.7W1.

[0032] In some embodiments, refer to Figure 8 The insulating layer 112 includes a third insulating layer 1123; In the circumferential direction of the adhesive layer 111, the third insulating layer 1123 surrounds the adhesive layer 111.

[0033] In this embodiment, the insulating layer 112 specifically includes a third insulating layer 1123. The third insulating layer 1123 is located in the circumferential direction of the adhesive layer 111, enclosing the adhesive layer 111 in a surrounding shape. Both are coated in the coating area. In the cross-section of the coating area, the third insulating layer 1123 forms an annular or frame-shaped structure, completely surrounding the adhesive layer 111. Furthermore, the projections of the two layers in the thickness direction of the first electrode 110 do not overlap, ensuring that the insulating layer 112 and the adhesive layer 111 are functionally independent. When the first electrode 110, the separator 120, and the second electrode 130 are stacked and wound into a core 100, the third insulating layer 1123 and the adhesive layer 111 are exposed on the outer surface of the core 100. The adhesive layer 111 is responsible for bonding and fixing to the battery casing, while the third insulating layer 1123 provides all-around insulation and protection.

[0034] In some embodiments, refer to Figure 9 The insulating layer 112 includes a fourth insulating layer 1124, and the number of the fourth insulating layer 1124 and the adhesive layer 111 are both multiple. In the width or length direction of the first electrode 110, a plurality of fourth insulating layers 1124 and a plurality of adhesive layers 111 are arranged alternately.

[0035] In this embodiment, the insulating layer 112 specifically includes a fourth insulating layer 1124, and there are multiple fourth insulating layers 1124. There are also multiple adhesive layers 111. The fourth insulating layers 1124 and adhesive layers 111 are arranged alternately in the width or length direction of the first electrode 110. That is, a fourth insulating layer 1124 is provided between any two adjacent adhesive layers 111, or an adhesive layer 111 is provided between any two adjacent fourth insulating layers 1124. The projections of the fourth insulating layers 1124 and adhesive layers 111 in the thickness direction of the first electrode 110 are independent of each other and do not overlap.

[0036] In some embodiments, the area ratio of the adhesive layer 111 to the outer surface is A1, and the area ratio of the insulating layer 112 to the outer surface is A2, wherein A1 and A2 satisfy: 3 / 7 ≤ A1 / A2 ≤ 7 / 3.

[0037] In this embodiment, the area ratio of the adhesive layer 111 to the outer surface is A1, and the area ratio of the insulating layer 112 to the outer surface is A2. The ratio of A1 to A2 can be set in the range of 3 / 7 to 7 / 3. For example, the ratio of A1 to A2 can be set to 3 / 7, 2 / 3, 1 / 1, 3 / 2, 7 / 3, etc., depending on the actual needs. That is, the sum of the areas of the adhesive layer 111 and the insulating layer 112 is equal to the area of ​​the outer surface. Taking the area of ​​the outer surface as S as an example, the area S1 of the adhesive layer 111 can be 30%S and the area S2 of the insulating layer 112 can be 70%S; or, the area S1 of the adhesive layer 111 can be 40%S and the area S2 of the insulating layer 112 can be 60%S; or, the area S1 of the adhesive layer 111 and the area S2 of the insulating layer 112 can both be 50%S; or, the area S1 of the adhesive layer 111 can be 60%S and the area S2 of the insulating layer 112 can be 40%S; or, the area S1 of the adhesive layer 111 can be 70%S and the area S2 of the insulating layer 112 can be 30%S. This range ensures that the area distribution of the adhesive layer 111 and the insulating layer 112 on the outer side of the core 100 is within a reasonable range, which can ensure reliable bonding strength between the cell and the battery case, and achieve effective insulation protection, so that the two functions can work together.

[0038] In some embodiments, the thickness of the adhesive layer 111 is H1, and the thickness of the insulating layer 112 is H2, wherein H1 and H2 satisfy: 2μm≤H1≤6μm, 1μm≤H2≤3μm.

[0039] In this embodiment, the thickness H1 of the adhesive layer 111 can be set within the range of 2μm to 6μm. For example, the thickness H1 of the adhesive layer 111 can be set to 2μm, 4μm, 6μm, etc., selected according to actual needs. Similarly, the thickness H2 of the insulating layer 112 can be set within the range of 1μm to 3μm. For example, the thickness H2 of the insulating layer 112 can be set to 1μm, 2μm, 3μm, etc., selected according to actual needs. The limited thickness of the adhesive layer 111 and the insulating layer 112 in this embodiment ensures that while maintaining their respective functions, the overall structure of the battery cell is optimized. The thickness is kept substantially the same as the active material layer of the electrode, avoiding unnecessary additional thickness and maintaining the compactness and space utilization of the battery.

[0040] In some embodiments, the thickness difference between the thickness H1 of the adhesive layer 111 and the thickness H2 of the insulating layer 112 is H0, where H0 satisfies: 0 μm ≤ H0 ≤ 4 μm; The area of ​​the adhesive layer 111 is S1, the area of ​​the insulating layer 112 is S2, and H0, S1 and S2 satisfy: 0.43≤H0 / (S2 / S1)≤9.

[0041] In this embodiment, the thickness difference H0 between the thickness H1 of the adhesive layer 111 and the thickness H2 of the insulating layer 112 can be set within the range of 0μm to 4μm. For example, H0 can be set to 0μm, 2μm, 4μm, etc., selected according to actual needs. This embodiment does not impose any restrictions on this. By limiting the range of this thickness difference, reliable bonding between the cell and the battery casing can be achieved while effectively improving the consistency of the cell thickness and optimizing the overall structure of the cell. Preferably, 1μm≤H0≤3μm.

[0042] Furthermore, a correlation between the thickness difference and the area can be established. Specifically, the area of ​​the adhesive layer 111 is S1, and the area of ​​the insulating layer 112 is S2. H0, S1, and S2 must satisfy: 0.043≤H0 / (S2 / S1)≤9. That is, H0 / (S2 / S1) can be 0.043, 1, 3.5, 6, 8.5, 9, etc., selected according to actual needs. This embodiment does not impose any restrictions on this. During the coating process of the coating area of ​​the first electrode 110, the thickness difference and area between the adhesive layer 111 and the insulating layer 112 are controlled collaboratively to further optimize the distribution from the perspective of spatial proportion, ensuring the overall bonding effect. Preferably, 0.43≤H0 / (S2 / S1)≤7.

[0043] Specifically, the increase in the coating area of ​​the adhesive layer 111 and the increase in the thickness difference between the adhesive layer 111 and the insulating layer 112 have a positive effect on the bonding effect, while the increase in the coating area of ​​the insulating layer 112 has a negative effect on the bonding effect. To ensure the bonding effect, based on the thickness difference between the adhesive layer 111 and the insulating layer 112 in the embodiment, as well as the coating area of ​​the adhesive layer 111 and the insulating layer 112, the relationship between the thickness difference and the area between the adhesive layer 111 and the insulating layer 112 is controlled, namely H0*S1 / S2. For example, when H0 and S1 take the minimum value of 0.1μm and 30% of the outer surface area respectively, and S2 takes the maximum value of 70% of the outer surface area, the minimum endpoint value of the formula is 0.043. When H0 and S1 take the maximum value of 4μm and 70% of the outer surface area respectively, and S2 takes the maximum value of 30% of the outer surface area, the maximum endpoint value of the formula is 9. That is, 0.043≤H0 / (S2 / S1)≤9 is required.

[0044] In some embodiments, the insulating layer 112 is a ceramic layer. The ceramic slurry of the ceramic layer can be composed of PVDF and Al2O3 in a mass ratio of (10~5):(90~95), or the ceramic layer can be made of materials such as boehmite, aluminum nitride, and titanium oxide, which can be selected according to actual needs. This embodiment does not limit this. The ceramic layer has stable chemical properties and is not prone to chemical reactions with the electrolyte, active materials, etc. inside the battery cell. During long-term use of the battery, the use of a ceramic layer for the insulating layer 112 can effectively avoid the problem of decreased insulation performance or material damage caused by chemical corrosion, ensuring that the insulating layer 112 can function stably for a long time. In addition, the ceramic layer also has a microporous structure, which allows lithium ions to pass through smoothly, helping to improve battery performance.

[0045] This utility model embodiment also proposes a battery, which includes a battery casing and a battery cell as described in the foregoing embodiments, wherein the battery cell is disposed in the battery casing. The specific structure of the battery cell is the same as described in the foregoing embodiments. Since this battery adopts all the technical solutions of all the foregoing embodiments, it has at least all the technical effects brought about by the technical solutions of the foregoing embodiments, and will not be described in detail here. The battery can be a lithium battery.

[0046] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. An electric cell, characterized by, include: The core includes a first electrode, a diaphragm, and a second electrode arranged in a stacked and wound manner, wherein the second electrode has the opposite polarity to the first electrode. In this embodiment, the current collector of the first electrode has a coating area on one surface in its thickness direction. The coating area is coated with an adhesive layer, which is exposed on the outer side of the winding core after the first electrode is wound, and is used to bond the battery casing.

2. The electric cell of claim 1, wherein, The coating area is also coated with an insulating layer, which is located on at least one side of the adhesive layer in the circumferential direction.

3. The battery cell according to claim 2, characterized in that, The insulating layer includes a first insulating layer and a second insulating layer; In the width or length direction of the first electrode, the first insulating layer and the second insulating layer are respectively disposed on opposite sides of the adhesive layer.

4. The battery cell according to claim 2, characterized in that, The insulating layer includes a third insulating layer; In the circumferential direction of the adhesive layer, the third insulating layer surrounds the adhesive layer.

5. The battery cell according to claim 2, characterized in that, The insulating layer includes a fourth insulating layer, and there are multiple fourth insulating layers and multiple adhesive layers; In the width or length direction of the first electrode, a plurality of the fourth insulating layers and a plurality of the adhesive layers are arranged alternately.

6. The battery cell according to any one of claims 2 to 5, characterized in that, The area ratio of the adhesive layer to the outer surface is A1, and the area ratio of the insulating layer to the outer surface is A2. A1 and A2 satisfy: 3 / 7 ≤ A1 / A2 ≤ 7 / 3.

7. The battery cell according to claim 6, characterized in that, The thickness of the adhesive layer is H1, and the thickness of the insulating layer is H2. H1 and H2 satisfy: 2μm≤H1≤6μm, 1μm≤H2≤3μm.

8. The battery cell according to claim 6 or 7, characterized in that, The thickness difference between the thickness H1 of the adhesive layer and the thickness H2 of the insulating layer is H0, and H0 satisfies: 0μm≤H0≤4μm; The area of ​​the adhesive layer is S1, the area of ​​the insulating layer is S2, and H0, S1 and S2 satisfy: 0.043≤H0 / (S2 / S1)≤9.

9. The battery cell according to any one of claims 2 to 5, characterized in that, The insulating layer is a ceramic layer.

10. A battery, characterized in that, It includes a battery casing and a battery cell as described in any one of claims 1 to 9, wherein the battery cell is disposed in the battery casing.

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