Battery cell structure and lithium ion battery

Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a battery cell structure and a lithium ion battery. The battery cell body is composed of one or more electrode assemblies, each electrode assembly comprises a negative pole piece, a positive pole piece and a second isolating membrane between the negative pole piece and the positive pole piece, a first isolating membrane is arranged on the outer surface of the negative pole piece, and the inner surface of the positive pole piece is tightly attached to the adjacent first isolating membrane; each electrode assembly is provided with a pole piece function area, the pole piece function areas are located on the positive pole piece and / or the negative pole piece, the pole piece function areas are arranged in the length direction of the pole piece, and the pole piece function areas divide the pole piece into an upper pole piece area and a lower pole piece area. The functional area is arranged in the heat concentration area of the electrode assembly, so that heat can be effectively guided out in the heat production process of the battery, internal accumulated heat is reduced, the heat dissipation efficiency of the heat concentration area of the battery cell is improved, the temperature range of each area of the battery cell is reduced, the safety performance of the battery is improved, and the cycle life of the battery cell is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, in particular to a battery core structure and a lithium ion battery. Background Art

[0002] Lithium-ion batteries have many advantages, such as high volume and mass energy density, and are widely used in the fields of power and energy storage. However, with the development of lithium battery technology, large-scale energy storage electrical equipment has higher and higher energy requirements for single lithium-ion batteries. As the energy of the single cell increases and the size of the cell increases, the cell generates more heat during charging and discharging, and the heat dissipation becomes more and more difficult. The higher the accumulated temperature, the greater the impact once thermal runaway occurs.

[0003] Developing battery cells with higher heat dissipation capabilities through the design of battery cell structure, thereby improving the safety performance of single battery cells, has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problems existing in the prior art in the above-mentioned background technology, a functional area is set in the heat concentration area of ​​the electrode assembly, which can effectively dissipate heat during the heat generation process of the battery, reduce internal heat accumulation, and improve the heat dissipation efficiency of the heat concentration area of ​​the battery cell, so that the temperature distribution of the battery cell is more uniform. Battery structure and lithium-ion battery.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a battery cell structure, including a battery cell body, the battery cell body is composed of one or more electrode assemblies, each electrode assembly includes a negative electrode sheet and a positive electrode sheet, a second layer of separation film is provided between the negative electrode sheet and the positive electrode sheet, the outer surface of the negative electrode sheet is provided with a first layer of separation film, and the inner surface of the positive electrode sheet is closely attached to the first layer of separation film of the adjacent layer; Each electrode assembly is provided with a pole piece functional area, which is located on the positive pole piece and / or the negative pole piece, and is arranged along the length direction of the pole piece, and the pole piece functional area divides the pole piece into an upper pole piece area and a lower pole piece area.

[0006] Further, the positive electrode sheet includes a positive electrode current collector, and the electrode sheet functional region is located on the positive electrode current collector to form a positive electrode sheet functional region, and the positive electrode sheet functional region divides the positive electrode current collector into an upper positive electrode sheet region and a lower positive electrode sheet region; The positive electrode current collector is connected to a positive electrode, and both sides of the positive electrode current collector in the upper positive electrode plate region are coated with a first positive electrode active coating to form a first positive electrode active coating region; Both sides of the positive electrode current collector in the lower positive electrode plate region are coated with a second positive electrode active coating to form a second positive electrode active coating region; Both sides of the positive electrode collector in the positive electrode functional area are coated with a high thermal conductivity material coating with a thermal conductivity range of 200 to 5000 Wm -1 .K -1 .

[0007] Furthermore, the negative electrode plate includes a negative electrode current collector, on which a negative electrode is arranged, and both sides of the negative electrode current collector are coated with a first negative electrode active coating.

[0008] Furthermore, a negative electrode sheet functional region is provided on the negative electrode sheet, and the negative electrode sheet functional region is arranged along the length direction of the negative electrode sheet, and the negative electrode sheet functional region divides the negative electrode sheet into an upper negative electrode sheet region and a lower negative electrode sheet region; The negative electrode sheet includes a negative electrode current collector, and the electrode sheet functional area is located on the negative electrode current collector to form a negative electrode sheet functional area, and the negative electrode sheet functional area divides the negative electrode current collector into an upper negative electrode sheet area and a lower negative electrode sheet area; The negative electrode current collector is provided with a negative electrode, and both sides of the negative electrode current collector in the upper negative electrode plate area are coated with a first negative electrode active coating to form a first negative electrode active coating area; both sides of the negative electrode current collector in the lower negative electrode plate area are coated with a second negative electrode active coating to form a second negative electrode active coating area; Both sides of the positive electrode collector in the functional area of ​​the negative electrode are coated with a high thermal conductivity material coating with a thermal conductivity range of 200 to 5000 Wm -1 .K -1 .

[0009] Further, the width W343 of the positive electrode functional area is 2 to 10 mm; The thickness D343 of the positive electrode plate functional area is less than or equal to the thickness D342 of the first positive electrode active coating area and the thickness D344 of the second positive electrode active coating area; The width W342 of the first positive electrode active coating layer: the width W344 of the second positive electrode active coating layer is (2:8) to (5:5).

[0010] Furthermore, the width W323 of the negative electrode functional area is 2 to 10 mm; The thickness D323 of the negative electrode plate functional area is less than or equal to the thickness D322 of the first negative electrode active coating and the thickness D324 of the second negative electrode active coating; The width W323 of the negative electrode functional area is less than or equal to the width W343 of the positive electrode functional area; The width W342 of the first negative electrode active coating layer: the width W344 of the second negative electrode active coating layer is (2:8) to (5:5).

[0011] Furthermore, the length of the functional area of ​​the positive electrode sheet is less than or equal to the length of the positive electrode sheet.

[0012] Furthermore, the length of the functional area of ​​the negative electrode plate is less than or equal to the length of the negative electrode plate.

[0013] Furthermore, ceramic coatings are provided on both sides of the positive electrode, and the thickness of the ceramic coatings is less than or equal to the thickness D342 of the first positive electrode active coating and the thickness D344 of the second positive electrode active coating.

[0014] Furthermore, the electrode assembly is a winding structure with electrodes output from one side, a stacking structure with electrodes output from one side, a winding structure with electrodes output from both sides, or a stacking structure with electrodes output from both sides.

[0015] A lithium-ion battery comprises a shell, wherein a cover plate is provided on the shell to form a closed space, wherein a plurality of battery cell structures as described above are installed in the closed space, an insulating member is provided between the shell and the battery cell structure, and a connector is connected to the electrode in the battery cell structure, and the connector is connected to the pole piece connector on the battery cell structure.

[0016] Beneficial effects of the present invention: The present invention sets a functional area in the heat concentration area of ​​the electrode assembly, and the functional area is set in the heat concentration area of ​​the single cell. The area contains a high thermal conductivity material coating, such as a graphene coating, etc., and the thermal conductivity range is 200 to 5000 Wm -1 .K -1 (The thermal conductivity of lithium-ion batteries is generally around 0.2 Wm -1 .K -1 Up to 2.0 Wm -1 .K -1 The high thermal conductivity layer can transfer heat from the inside to the outside of the battery cell more quickly during normal charge and discharge of the battery cell through its own high thermal conductivity. Therefore, it can effectively export heat during the heat generation of the battery, reduce internal heat accumulation, and improve the heat dissipation efficiency of the heat-concentrated area of ​​the battery cell, making the temperature distribution of the battery cell more uniform, reducing the temperature difference between different areas of the battery cell, further reducing the temperature rise of the battery cell, and improving the safety performance of the battery and the cycle life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 The present invention Figure 1 AA cross-sectional view; Figure 3 is a schematic structural diagram of Embodiment 2 of the present invention; Figure 4 The present invention Figure 3 A cross-sectional view along the BB direction; Figure 5 is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 6 The present invention Figure 5 The cross-sectional view along CC direction; Figure 7 is a schematic structural diagram of Embodiment 4 of the present invention; Figure 8 The present invention Figure 7 DD-direction cross-sectional view; Fig. 9 is a schematic structural diagram of Embodiment 5 of the present invention; Fig.10 The present invention Fig. 9 EE-direction cross-sectional view; Fig.11 is a schematic diagram of the structure of Embodiment 6 of the present invention; Fig.12 The present invention Fig.11 FF-direction cross-sectional view; Fig.13 is a schematic diagram of the structure of Embodiment 7 of the present invention; Fig.14 The present invention Fig.13 The cross-sectional view along the GG direction; Fig.15 is a schematic diagram of the structure of Embodiment 8 of the present invention; Fig.16 The present invention Fig.15 A cross-sectional view taken along the HH direction; Fig.17 is a schematic structural diagram of Embodiment 9 of the present invention; Fig.18 The present invention Fig.17 A cross-sectional view taken along line II; Fig.19 is a schematic diagram of the structure of Embodiment 10 of the present invention; Fig. 20 The present invention Fig.19 A cross-sectional view taken along the JJ axis; Fig.21 is a schematic diagram of the structure of Embodiment 11 of the present invention; Fig. 22 The present invention Fig.21 A cross-sectional view taken along the KK axis; Fig.23 is a schematic diagram of the structure of Embodiment 12 of the present invention; Fig.24 The present invention Fig.23 LL-direction cross-sectional view; Fig.25 is a schematic diagram of the structure of Embodiment 13 of the present invention; Fig.26 The present invention Fig.25 MM-direction cross-sectional view; Fig. 27 is a schematic structural diagram of Embodiment 14 of the present invention; Fig.28 The present invention Fig. 27 NN-direction cross-sectional view; Fig.29 is an exploded view of the lithium ion battery of the present invention; In the figure: 1. Cover plate, 2. Connector, 21. Negative electrode connector, 22. Positive electrode connector, 3. Cell body, 3-1. Upper electrode area, 3-2. Lower electrode area, 4. Insulator, 5. Shell, 31. The first layer of isolation film, 32. The negative electrode sheet, 33. The second layer of isolation film, 34. The positive electrode sheet, 341. Positive electrode, 342. First positive electrode active coating, 343. Positive electrode sheet functional area, 344. Second positive electrode active coating, 345. Positive current collector, 346. Ceramic coating, 321. Negative electrode, 322. First negative electrode active coating, 323. Negative electrode sheet functional area, 324. Second negative electrode active coating, 325. Negative current collector. DETAILED DESCRIPTION

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0020] Example 1: Functional area of ​​a single negative electrode sheet in a wound structure battery cell with a single-side electrode output like Figures 1-2 A cell structure shown includes a cell body 3, the cell body 3 is composed of one or more electrode assemblies, the electrode assembly is a winding structure with electrodes on one side, each electrode assembly includes a negative electrode sheet 32 ​​and a positive electrode sheet 34, a second layer of separator 33 is provided between the negative electrode sheet 32 ​​and the positive electrode sheet 34, the outer surface of the negative electrode sheet 32 ​​is provided with a first layer of separator 31, and the inner surface of the positive electrode sheet 34 is in close contact with the first layer of separator 31 of the adjacent layer; Each electrode assembly is provided with a pole piece functional area, which is located on the positive pole piece 34, and is arranged along the length direction of the pole piece. The pole piece functional area divides the pole piece into an upper pole piece area 3-1 and a lower pole piece area 3-2. That is to say, the existence of the pole piece functional area physically divides the pole piece of the electrode assembly into two parts, namely the upper pole piece area 3-1 and the lower pole piece area 3-2, that is, the thermal center of the battery is changed from one to two thermal centers; local overheating is reduced, and the risk of thermal runaway of the battery cell can be further reduced.

[0021] The positive electrode sheet 34 includes a positive electrode current collector 345. The electrode sheet functional region is located on the positive electrode current collector 345 to form a positive electrode sheet functional region 343. The positive electrode sheet functional region 343 divides the positive electrode current collector 345 into an upper positive electrode sheet region and a lower positive electrode sheet region. The positive electrode 341 is connected to the positive current collector 345, and both sides of the positive current collector 345 in the upper positive electrode plate area are coated with a first positive active coating 342 to form a first positive active coating area; Both sides of the positive electrode current collector 345 in the lower positive electrode plate region are coated with a second positive electrode active coating 344 to form a second positive electrode active coating region; The positive electrode functional area 343 is arranged in a relatively heat concentrated area, and both sides of the positive electrode current collector 345 in the positive electrode functional area 343 are coated with a high thermal conductivity material coating, and the thermal conductivity range is 200 to 5000 Wm -1 .K -1 (The thermal conductivity of lithium-ion batteries is generally around 0.2 Wm -1 .K -1 Up to 2.0 Wm -1 .K -1 ), the high thermal conductivity material coating is selected from graphene coating, etc. The high thermal conductivity material coating can conduct heat from the inside to the outside of the battery body 3 more quickly through its own high thermal conductivity. Therefore, it can effectively conduct heat during the heat generation process of the battery, reduce internal heat accumulation, further reduce the temperature rise of the electrode assembly, and improve the safety performance of the battery.

[0022] The width W343 of the positive electrode functional area 343 is 2 to 10 mm, which has little effect on the energy density of the product; The thickness D343 of the positive electrode sheet functional region 343 is less than or equal to the thickness D342 of the first positive electrode active coating region and the thickness D344 of the second positive electrode active coating region; The width W342 of the first positive electrode active coating layer 342 and the width W344 of the second positive electrode active coating layer 344 are in the range of 2:8 to 5:5.

[0023] The length of the positive electrode sheet functional area 343 is equal to the length of the positive electrode sheet 34 .

[0024] The negative electrode sheet 32 ​​includes a negative electrode collector 325 , on which a negative electrode 321 is disposed. Both sides of the negative electrode collector 325 are coated with a first negative electrode active coating 322 .

[0025] Example 2: Functional area of ​​a single positive electrode sheet of a wound structure battery cell with a single-side electrode containing a ceramic coating The difference from Example 1 is that: Figures 3-4 As shown, ceramic coatings 346 are provided on both sides of the positive electrode 341 , and the thickness of the ceramic coatings 346 is less than or equal to the thickness D342 of the first positive active coating 342 and the thickness D344 of the second positive active coating 344 .

[0026] Example 3: The positive electrode sheet functional area and the negative electrode sheet functional area of ​​the wound structure battery cell with a single-side electrode output like Figures 5-6 As shown, the difference from Example 1 is that: a negative electrode sheet functional area 323 is provided on the negative electrode sheet 32, and the negative electrode sheet functional area 323 is arranged along the length direction of the negative electrode sheet 32, and the negative electrode sheet functional area 323 divides the negative electrode sheet 32 ​​into an upper negative electrode sheet area and a lower negative electrode sheet area; The negative electrode sheet 32 ​​includes a negative electrode current collector 325, and the electrode sheet functional region is located on the negative electrode current collector 325 to form a negative electrode sheet functional region 323, and the negative electrode sheet functional region 323 divides the negative electrode current collector 325 into an upper negative electrode sheet region and a lower negative electrode sheet region; The negative electrode collector 325 is provided with a negative electrode 321, and both sides of the negative electrode collector 325 in the upper negative electrode plate area are coated with a first negative electrode active coating 322 to form a first negative electrode active coating area; both sides of the negative electrode collector 325 in the lower negative electrode plate area are coated with a second negative electrode active coating 324 to form a second negative electrode active coating area; Both sides of the positive electrode current collector 345 in the negative electrode functional area 323 are coated with a high thermal conductivity material coating with a thermal conductivity range of 200 to 5000 Wm -1 .K -1 .

[0027] The width W323 of the negative electrode functional area 323 is 2 to 10 mm, which has little effect on the energy density of the product; The thickness D323 of the negative electrode sheet functional region 323 is less than or equal to the thickness D322 of the first negative electrode active coating 322 and the thickness D324 of the second negative electrode active coating 324; The width W323 of the negative electrode sheet functional region 323 is less than or equal to the width W343 of the positive electrode sheet functional region 343; The ratio of the width W342 of the first negative electrode active coating layer 322 to the width W344 of the second negative electrode active coating layer 324 is 2:8 to 5:5.

[0028] The length of the negative electrode sheet functional region 323 is equal to the length of the negative electrode sheet 32 ​​.

[0029] Example 4: The positive electrode sheet functional area and the negative electrode sheet functional area of ​​the wound structure battery cell with a single-side electrode containing a ceramic coating The difference from Example 3 is that: Figures 7-8 As shown, ceramic coatings 346 are provided on both sides of the positive electrode 341 , and the thickness of the ceramic coatings 346 is less than or equal to the thickness D342 of the first positive active coating 342 and the thickness D344 of the second positive active coating 344 .

[0030] Example 5: Single positive electrode functional area of ​​a laminated structure with a single-side electrode The difference from Example 1 is that: Figures 9-10 As shown, the electrode assembly is a laminated structure with electrodes output on one side.

[0031] Example 6: Functional area of ​​a single positive electrode sheet with a laminated structure of a single-side electrode with a ceramic coating The difference from Example 5 is that: Figures 11-12 As shown, ceramic coatings 346 are provided on both sides of the positive electrode 341 , and the thickness of the ceramic coatings 346 is less than or equal to the thickness D342 of the first positive active coating 342 and the thickness D344 of the second positive active coating 344 .

[0032] Embodiment 7: Positive electrode sheet functional area and negative electrode sheet functional area of ​​the laminated structure with single-side output electrode The difference from Example 3 is that: Figures 13-14 As shown, the electrode assembly is a laminated structure with electrodes output on one side.

[0033] Example 8: Positive electrode sheet functional area and negative electrode sheet functional area of ​​a laminated structure of a single-side electrode with a ceramic coating The difference from Example 7 is that: Figures 15-16 As shown, ceramic coatings 346 are provided on both sides of the positive electrode 341 , and the thickness of the ceramic coatings 346 is less than or equal to the thickness D342 of the first positive active coating 342 and the thickness D344 of the second positive active coating 344 .

[0034] Example 9: Functional area of ​​a single positive electrode sheet with a wound structure of double-sided electrodes The difference from Example 5 is that: Figures 17-18 As shown, the electrode assembly is a winding structure with electrodes on both sides.

[0035] Embodiment 10: The winding structure of the double-sided electrode has a positive electrode sheet functional area and a negative electrode sheet functional area The difference from Example 8 is that: Figures 19-20 As shown, the electrode assembly is a laminated structure with electrodes on both sides.

[0036] Example 11: Functional area of ​​the positive electrode sheet of the laminated structure of the single-side electrode with ceramic coating The difference from Example 6 is that: Figures 21-22 As shown, the length of the positive electrode sheet functional area 343 is smaller than the length of the positive electrode sheet 34 .

[0037] Example 12: Part of the positive electrode sheet functional area and part of the negative electrode sheet functional area of ​​the laminated structure of the single-side output electrode containing ceramic coating The difference from Example 8 is that: Figures 21-22 As shown, the length of the positive electrode sheet functional area 343 is less than the length of the positive electrode sheet 34; The length of the negative electrode plate functional region 323 is smaller than the length of the negative electrode plate 32 .

[0038] Example 13: Functional area of ​​the positive electrode sheet of the laminated structure with double-sided electrodes The difference from Example 9 is that: Figures 23-24 As shown, the length of the positive electrode sheet functional area 343 is smaller than the length of the positive electrode sheet 34 .

[0039] Embodiment 14: Double-sided electrode stacking structure with partial positive electrode sheet functional area and partial negative electrode sheet functional area The difference from Example 10 is: Figures 25-26 As shown, the length of the positive electrode sheet functional area 343 is less than the length of the positive electrode sheet 34; The length of the negative electrode plate functional region 323 is smaller than the length of the negative electrode plate 32 .

[0040] Embodiment 14: Winding structure of double-side output electrodes The difference from Example 1 is that the electrode assembly is a winding structure with electrodes on both sides.

[0041] like Fig. 27 As shown, a lithium-ion battery comprises a shell 5, wherein the shell 5 is covered with a cover plate 1 to form a closed space, wherein a plurality of battery cell structures are installed in the closed space, an insulating member 4 is provided between the shell 5 and the battery cell structure, and a connector 2 is connected to the electrode in the battery cell structure, and the connector 2 is divided into a positive connector 21 and a negative connector 22, wherein the positive connector 21 is connected to the positive electrode 341 in the battery cell structure, and the negative connector 22 is connected to the negative electrode 321.

[0042] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A battery cell structure, characterized in that: The battery cell body (3) comprises one or more electrode assemblies, each electrode assembly comprises a negative electrode sheet (32) and a positive electrode sheet (34), a second layer of separation film (33) is provided between the negative electrode sheet (32) and the positive electrode sheet (34), a first layer of separation film (31) is provided on the outer surface of the negative electrode sheet (32), and the inner surface of the positive electrode sheet (34) is in close contact with the first layer of separation film (31) of the adjacent layer; Each electrode assembly is provided with a pole piece functional area, the pole piece functional area is located on the positive pole piece (34) and / or the negative pole piece (32), the pole piece functional area is arranged along the length direction of the pole piece, and the pole piece functional area divides the pole piece into an upper pole piece area (3-1) and a lower pole piece area (3-2); The positive electrode sheet (34) includes a positive electrode current collector (345), and the electrode sheet functional region is located on the positive electrode current collector (345) to form a positive electrode sheet functional region (343). The positive electrode sheet functional region (343) divides the positive electrode current collector (345) into an upper positive electrode sheet region and a lower positive electrode sheet region; The positive electrode collector (345) is connected to a positive electrode (341), and both sides of the positive electrode collector (345) in the upper positive electrode plate region are coated with a first positive electrode active coating (342) to form a first positive electrode active coating region; Both sides of the positive electrode current collector (345) in the lower positive electrode plate region are coated with a second positive electrode active coating (344) to form a second positive electrode active coating region; Both sides of the positive electrode current collector (345) in the positive electrode plate functional area (343) are coated with a high thermal conductivity material coating; The width W343 of the positive electrode plate functional area (343) is 2 to 10 mm; The thickness D343 of the positive electrode plate functional region (343) is less than or equal to the thickness D342 of the first positive electrode active coating region and the thickness D344 of the second positive electrode active coating region; The width W342 of the first positive electrode active coating layer (342) and the width W344 of the second positive electrode active coating layer (344) are (2:8) to (5:5).

2. A battery cell structure according to claim 1, characterized in that: The negative electrode sheet (32) comprises a negative electrode current collector (325), on which a negative electrode (321) is arranged, and both sides of the negative electrode current collector (325) are coated with a first negative electrode active coating (322).

3. A battery cell structure according to claim 1, characterized in that: The negative electrode sheet (32) is provided with a negative electrode sheet functional area (323), the negative electrode sheet functional area (323) is arranged along the length direction of the negative electrode sheet (32), and the negative electrode sheet functional area (323) divides the negative electrode sheet (32) into an upper negative electrode sheet area and a lower negative electrode sheet area; The negative electrode sheet (32) includes a negative electrode current collector (325), the electrode sheet functional region is located on the negative electrode current collector (325), forming a negative electrode sheet functional region (323), and the negative electrode sheet functional region (323) divides the negative electrode current collector (325) into an upper negative electrode sheet region and a lower negative electrode sheet region; The negative electrode current collector (325) is provided with a negative electrode (321), and both sides of the negative electrode current collector (325) in the upper negative electrode plate region are coated with a first negative electrode active coating (322) to form a first negative electrode active coating region; and both sides of the negative electrode current collector (325) in the lower negative electrode plate region are coated with a second negative electrode active coating (324) to form a second negative electrode active coating region; Both sides of the positive electrode current collector (345) in the negative electrode plate functional area (323) are coated with a high thermal conductivity material coating.

4. A battery cell structure according to claim 3, characterized in that: The width W323 of the negative electrode plate functional area (323) is 2 to 10 mm; The thickness D323 of the negative electrode plate functional region (323) is less than or equal to the thickness D322 of the first negative electrode active coating (322) and the thickness D324 of the second negative electrode active coating (324); The width W323 of the negative electrode plate functional region (323) is less than or equal to the width W343 of the positive electrode plate functional region (343); The width W342 of the first negative electrode active coating (322) and the width W344 of the second negative electrode active coating (324) are (2:8) to (5:5).

5. A battery cell structure according to claim 1, characterized in that: The length of the positive electrode plate functional area (343) is less than or equal to the length of the positive electrode plate (34).

6. A battery cell structure according to claim 3, characterized in that: The length of the negative electrode plate functional area (323) is less than or equal to the length of the negative electrode plate (32).

7. A battery cell structure according to claim 2, characterized in that: Ceramic coatings (346) are provided on both sides of the positive electrode (341), and the thickness of the ceramic coating (346) is less than or equal to the thickness D342 of the first positive electrode active coating (342) and the thickness D344 of the second positive electrode active coating (344).

8. A battery cell structure according to claim 1, characterized in that: The electrode assembly is a winding structure with electrodes output from one side, a stacking structure with electrodes output from one side, a winding structure with electrodes output from both sides, or a stacking structure with electrodes output from both sides.

9. A lithium ion battery, characterized in that: The invention comprises a shell (5), wherein a cover plate (1) is provided on the shell (5) to form a closed space, wherein a plurality of battery cell structures according to any one of claims 1 to 8 are installed in the closed space, an insulating member (4) is provided between the shell (5) and the battery cell structure, and a connecting member (2) is connected to an electrode in the battery cell structure, and the connecting member (2) is connected to a pole piece connecting member on the battery cell structure.

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