Sectional type full-tab naked battery cell of power battery

Abstract

The utility model discloses a sectional type full-tab naked cell of a power battery, which comprises a negative plate, an isolating membrane and a positive plate which are sequentially laminated, the negative plate comprises a negative electrode coating area and a negative tab area, the positive plate comprises a positive electrode coating area and a positive tab area, the positive tab area and the negative tab area are distributed at two ends of the full-tab naked cell, and the isolating membrane is arranged on the negative electrode coating area. A first hollow-out area and a second hollow-out area are arranged on one of the positive tab area and the negative tab area in a staggered manner, and the first hollow-out area and the second hollow-out area are respectively positioned in the inner side area and the outer side area of one of the positive tab area and the negative tab area. The first hollow-out area and the second hollow-out area are arranged in a staggered manner and are respectively arranged in the inner side area and the outer side area; the conditions that when the negative tab area and the positive tab area are rubbed by the pressing head of the rubbing equipment, the overall thickness and thickness violent resonance occurs, and a large number of metal filings are generated when the notch edges of the first hollowed-out area and the second hollowed-out area are impacted can be avoided, so that the battery safety problem caused by a large number of metal filings is solved.

Description

Technical Field

[0001] The utility model relates to the field of power batteries, in particular to a segmented full-pole lug bare battery cell of a power battery. Background Art

[0002] With the increasingly serious crisis of non-renewable energy and the strong guidance of national policies, electric vehicles have become the main trend of the future development of the automobile industry. As an important component of electric vehicles, power batteries have the highest installed capacity in the field of electric vehicles due to their advantages such as small size, high energy density and green environmental protection. At present, large cylindrical lithium-ion / sodium-ion batteries with full-pole ears have gradually become the mainstream products in the new energy industry due to their high energy density, good capacity consistency, and support for high-rate charging and discharging. Conventional full-pole ear cylindrical batteries are flattened or flattened after winding, and then welded to the collector plate to connect the internal and external circuits. Its common defects are: 1. In order to ensure the effect of laser penetration welding collector plate, the surface of the copper / aluminum foil full-pole ears of cylindrical batteries is generally dense after flattening or flattening, resulting in a long electrolyte injection time during production due to slow electrolyte infiltration, which significantly affects the production capacity of cylindrical batteries; 2. The surface of the copper / aluminum foil full-pole ears of cylindrical batteries is relatively dense after flattening or flattening, which is easy to cause poor consistency of electrolyte absorption by positive and negative electrodes, thus affecting the battery cycle life. Summary of the invention

[0003] The utility model aims to provide a segmented full-tab bare battery cell of a power battery, so as to reduce the electrolyte injection time and improve the production capacity of the battery.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a segmented full-pole lug bare cell of a power battery, comprising a negative electrode sheet, a separator and a positive electrode sheet stacked in sequence, the negative electrode sheet comprising a negative electrode coating area and a negative electrode lug area, the positive electrode sheet comprising a positive electrode coating area and a positive electrode lug area, the positive electrode lug area and the negative electrode lug area are distributed at both ends of the full-pole lug bare cell, and a first hollow area and a second hollow area are staggeredly arranged on one of the positive electrode lug area and the negative electrode lug area, the first hollow area and the second hollow area are respectively located in the inner area and the outer area of ​​one of the positive electrode lug area and the negative electrode lug area.

[0005] Preferably, a third hollow area is also arranged on one of the positive electrode ear area and the negative electrode ear area, and the third hollow area is staggered with the first hollow area and the second hollow area. The third hollow area is located in the middle area between the inner area and the outer area on one of the positive electrode ear area and the negative electrode ear area.

[0006] Preferably, a fourth hollow area and a fifth hollow area are staggeredly arranged on the positive electrode lug area and the other one of the negative electrode lug areas, and the fourth hollow area and the fifth hollow area are respectively located in the inner area and the outer area of ​​the positive electrode lug area and the other one of the negative electrode lug area.

[0007] Preferably, a sixth hollow area is further arranged on the positive electrode ear area and the other electrode ear area of ​​the negative electrode ear area, and the sixth hollow area is staggered with the fourth hollow area and the fifth hollow area. The sixth hollow area is located in the middle area between the inner area and the outer area on the positive electrode ear area and the other electrode ear area of ​​the negative electrode ear area.

[0008] Preferably, a seventh hollow region is further arranged on the other one of the positive electrode lug region and the negative electrode lug region, and the seventh hollow region is located in the middle region of the other one of the positive electrode lug region and the negative electrode lug region.

[0009] Preferably, the inner region, the middle region and the outer region are continuously distributed, the first hollow region runs through the inner region, the third hollow region runs through the middle region and the second hollow region runs through the outer region.

[0010] Preferably, the inner area, the middle area and the outer area are distributed continuously, the first hollow area runs through the inner area, the second hollow area runs through the outer area, the third hollow area includes at least two sub-hollow areas arranged in a staggered manner, the middle area includes at least two sub-areas corresponding to the at least two sub-hollow areas, the at least two sub-areas are distributed continuously, and the at least two sub-hollow areas respectively run through the corresponding sub-areas.

[0011] Preferably, the full-tab bare cell is a cylindrical bare cell, the first hollow area and the second hollow area are located within the range of a first central angle, the third hollow area is located within the range of a second central angle diagonal to the first central angle, and the angle between the first central angle and the second central angle is greater than or equal to 30 degrees and less than or equal to 90 degrees.

[0012] Preferably, the included angle of the first hollow area is greater than or equal to 4 degrees and less than or equal to 6 degrees, the included angle of the third hollow area is greater than or equal to 3 degrees and less than or equal to 5 degrees, the included angle of the second hollow area is greater than or equal to 2 degrees and less than or equal to 4 degrees, the included angle of the second hollow area is smaller than the included angle of the third hollow area, and the included angle of the third hollow area is smaller than the included angle of the first hollow area.

[0013] Preferably, the full-tab bare cell has a first radius, the length of the first hollow area is greater than or equal to one-fifth of the first radius, the length of the second hollow area is greater than or equal to one-fifth of the first radius, the length of the third hollow area is greater than or equal to one-fifth of the first radius, and the sum of the length of the first hollow area, the length of the second hollow area and the length of the third hollow area is equal to the first radius.

[0014] Compared with the prior art, the utility model arranges the first hollow area and the second hollow area on the inner area and the outer area of ​​at least one of the positive ear area and the negative ear area. When the electrolyte is injected, the positive electrode coating area and the negative electrode coating area can quickly penetrate and absorb the electrolyte through the first hollow area and the second hollow area, which is beneficial to improve the consistency and speed of the positive electrode sheet and the negative electrode sheet to penetrate and absorb the electrolyte, improve the cycle life of the battery, reduce the electrolyte injection time during battery production, and improve the battery production capacity. In addition, the first hollow area and the second hollow area are staggered and arranged in the inner area and the outer area respectively, which can avoid and eliminate the violent resonance of the whole thickness when the pressure head of the flattening equipment flattens the negative ear area and the positive ear area, and the impact on the cut edges of the first hollow area and the second hollow area to produce a large amount of metal chips, thereby improving the battery safety problem caused by a large amount of metal chips when the full-ear bare battery cell is flattened. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a full-tab bare battery cell at one angle in Example 1 of the utility model.

[0016] Figure 2 This is a structural diagram from another angle of the full-tab bare battery cell in Example 1 of the utility model.

[0017] Figure 3 It is a schematic structural diagram of the positive electrode ear area in the first embodiment of the utility model.

[0018] Figure 4 This is a structural diagram after marking the angle of the first hollow area, the angle of the second hollow area, the angle of the third hollow area, the length of the second hollow area and the first radius on the positive electrode ear area in Example 1 of the utility model.

[0019] Figure 5 It is a structural schematic diagram of the third hollow area in the first embodiment of the utility model including the first sub-hollow area and the second sub-hollow area.

[0020] Figure 6 It is a schematic structural diagram of the positive electrode ear area in the second embodiment of the present utility model.

[0021] Figure 7 It is a schematic structural diagram of the negative electrode ear area in the second embodiment of the present utility model.

[0022] Figure 8 It is a schematic structural diagram of the positive electrode ear area in the third embodiment of the present utility model.

[0023] Fig. 9 It is a schematic structural diagram of the negative electrode ear area in the third embodiment of the present utility model.

[0024] Fig.10 It is a schematic structural diagram of the positive electrode sheet when it is not wound in the first embodiment of the present invention.

[0025] Fig.11 This is a schematic structural diagram of a positive electrode ear region of an unwound positive electrode sheet in the first embodiment of the present invention after a first slit is provided.

[0026] Fig.12 It is a schematic diagram of the structure of the negative electrode sheet when it is not wound in the first embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0028] Embodiment 1

[0029] like Figures 1 to 5 as well as Figures 10 to 12 As shown, an embodiment of the utility model provides a segmented full-pole lug bare cell 10 of a power battery, comprising a negative electrode sheet 2, a separator and a positive electrode sheet 1 which are stacked in sequence, the negative electrode sheet 2 comprising a negative electrode coating area 21 and a negative electrode lug area 22, the positive electrode sheet 1 comprising a positive electrode coating area 11 and a positive electrode lug area 12, the positive electrode lug area 12 and the negative electrode lug area 22 are distributed at both ends of the full-pole lug bare cell 10, and a first hollow area 121 and a second hollow area 122 are staggeredly arranged on one of the positive electrode lug area 12 and the negative electrode lug area 22, the first hollow area 121 and the second hollow area 122 are respectively located on the inner area and the outer area of ​​one of the positive electrode lug area 12 and the negative electrode lug area 22.

[0030] Specifically, the full-tab bare battery cell 10 is formed by stacking a negative electrode sheet 2, a separator and a positive electrode sheet 1, and the positive electrode tab area 12 and the negative electrode tab area 22 are respectively located at the two ends of the full-tab bare battery cell 10, and the positive electrode tab area 12 and the negative electrode tab area 22 are both in a multi-turn ring shape from the inside to the outside. The positive electrode tab area 12 and the negative electrode tab area 22 have an outer area close to the outside in the radial direction, an inner area close to the inside, and an intermediate area between the inner area and the outer area. The first hollow area 121 and the second hollow area 122 can be evenly distributed on the positive electrode tab area 12, or evenly distributed on the negative electrode tab area 22.

[0031] The utility model arranges the first hollow area 121 and the second hollow area 122 on the inner area and the outer area of ​​at least one of the positive electrode ear area 12 and the negative electrode ear area 22. When the electrolyte is injected, the positive electrode coating area 11 and the negative electrode coating area 21 can quickly penetrate and absorb the electrolyte through the first hollow area 121 and the second hollow area 122, which is beneficial to improve the consistency and speed of the positive electrode sheet 1 and the negative electrode sheet 2 to penetrate and absorb the electrolyte, improve the cycle life of the battery, and reduce the battery production. In addition, the first hollow area 121 and the second hollow area 122 are staggered and arranged in the inner area and the outer area respectively, which can avoid and eliminate the violent resonance of the overall thickness when the pressure head of the flattening equipment flattens the negative ear area 22 and the positive ear area 12, and the impact on the cut edges of the first hollow area 121 and the second hollow area 122 to produce a large amount of metal chips, thereby improving the battery safety problem caused by a large amount of metal chips when the full-ear bare battery cell 10 is flattened.

[0032] In the embodiment of the utility model, a third hollow area 123 is further arranged on one of the positive ear area 12 and the negative ear area 22, and the third hollow area 123 is staggered with the first hollow area 121 and the second hollow area 122, and the third hollow area 123 is located in the middle area between the inner area and the outer area on one of the positive ear area 12 and the negative ear area 22. Specifically, the third hollow area 123 and the first hollow area 121 and the second hollow area 122 are all arranged on the same side of the full-electrode ear bare battery cell 10, that is, the first hollow area 121, the second hollow area 122 and the third hollow area 123 are all arranged in the positive ear area 12, or the first hollow area 121, the second hollow area 122 and the third hollow area 123 are all arranged in the negative ear area 22, and by setting the third hollow area 123, the electrolyte seepage rate is further increased, and the battery production capacity is improved.

[0033] In the embodiment of the utility model, the inner area, the middle area and the outer area are continuously distributed, the first hollow area 121 runs through the inner area, the third hollow area 123 runs through the middle area and the second hollow area 122 runs through the outer area. Specifically, the first hollow area 121 is located in the inner area, the second hollow area 122 is located in the outer area, and the third hollow area 123 is located in the middle area. The first hollow area 121, the second hollow area 122 and the third hollow area 123 respectively run through the inner area, the outer area and the middle area, thereby increasing the length of the first hollow area 121, the second hollow area 122 and the third hollow area 123, thereby further increasing the electrolyte seepage speed and improving the battery production capacity.

[0034] In some other specific implementations of this embodiment, the inner area, the middle area and the outer area are continuously distributed, the first hollow area 121 runs through the inner area, the second hollow area 122 runs through the outer area, the third hollow area 123 includes at least two sub-hollow areas arranged in a staggered manner, the middle area corresponds to at least two sub-hollow areas including at least two sub-areas, the at least two sub-areas are continuously distributed, and the at least two sub-hollow areas respectively run through the corresponding sub-areas. Figure 5 As shown, the third hollow area 123 includes a first sub-hollow area 1231 and a second sub-hollow area 1232. By further forming the third hollow area 123 into a plurality of sub-hollow areas, the battery safety problem caused by a large amount of metal chips appearing when the bare battery cell is flattened can be further improved.

[0035] In the embodiment of the utility model, Figure 3 and Figure 4 As shown, the full-tab bare cell 10 is a cylindrical bare cell. The wound full-tab bare cell 10 has a center hole 101, the first hollow area 121 and the second hollow area 122 are located within the range of a first central angle, and the third hollow area 123 is located within the range of a second central angle a diagonal to the first central angle. The angle between the first central angle and the second central angle a is greater than or equal to 30 degrees and less than or equal to 90 degrees. Specifically, the first hollow area 121 and the second hollow area 122 are concentrated within the range of the first central angle, and the third hollow area 123 is set within the range of the diagonal second central angle a. This design allows the first hollow area 121, the second hollow area 122 and the third hollow area 123 to be avoided when laser welding the positive ear area 12 and the negative ear area 22 with the corresponding current collecting plate, and the non-hollow area with stable thickness is used for welding, which solves the problem of laser damage to the full-ear bare battery cell 10 caused by the unstable thickness of the flattened layer, that is, while ensuring the laser welding quality and solving the metal chips problem, the electrolyte infiltration is further accelerated.

[0036] In the embodiment of the utility model, Figure 3 and Figure 4As shown, the angle d of the first hollow area 121 is greater than or equal to 4 degrees and less than or equal to 6 degrees, the angle c of the third hollow area 123 is greater than or equal to 3 degrees and less than or equal to 5 degrees, the angle b of the second hollow area 122 is greater than or equal to 2 degrees and less than or equal to 4 degrees, the angle of the second hollow area 122 is smaller than the angle of the third hollow area 123, and the angle of the third hollow area 123 is smaller than the angle of the first hollow area 121. Specifically, by setting the angle d of the inner first hollow area 121 to be larger and the angle b of the outer second hollow area 122 to be smaller, the electrolyte can be more evenly infiltrated. In addition, the smaller angles of the first hollow area 121, the second hollow area 122 and the third hollow area 123 can further avoid and eliminate the violent resonance of the overall thickness when the pressure head of the flattening equipment flattens the negative ear area 22 and the positive ear area 12, and the situation in which a large amount of metal chips are generated by colliding with the cut edges of the first hollow area 121, the second hollow area 122 and the third hollow area 123, thereby improving the battery safety problem caused by the large amount of metal chips generated when the full-ear bare battery cell 10 is flattened.

[0037] In the embodiment of the utility model, Figure 3 and Figure 4 As shown, the full-tab bare cell 10 has a first radius R, the length of the first hollow area 121 is greater than or equal to one-fifth of the first radius R, the length L of the second hollow area 122 is greater than or equal to one-fifth of the first radius R, the length of the third hollow area 123 is greater than or equal to one-fifth of the first radius R, and the sum of the length of the first hollow area 121, the length L of the second hollow area 122 and the length of the third hollow area 123 is equal to the first radius R.

[0038] In the embodiment of the utility model, Figure 1 to Figure 2 As shown, at least one side surface of the first hollow area 121 is inclined or arc-shaped, and / or at least one side surface of the second hollow area 122 is inclined or arc-shaped, and / or at least one side surface of the third hollow area 123 is inclined or arc-shaped.

[0039] In the embodiment of the utility model, Figures 10 to 12As shown, the positive electrode sheet 1 and the negative electrode sheet 2 are in the shape of long strips when not wound, and a first foil area 3 is reserved on one side of the positive electrode coating area 11, and a second foil area 4 is reserved on one side of the negative electrode coating area 21. In the case where only the first hollow area 121, the second hollow area 122 and the third hollow area 123 are provided in the positive ear area 12, the die-cutting size and specification design of the first foil area 33 can be calculated according to design requirements, such as the diameter of the full-ear bare battery cell 10, the angle and length position of the first hollow area 121, the angle and length position of the second hollow area 122, and the angle and length position of the third hollow area 123, including the size and surface shape of the first foil grooves 31 arranged at intervals on the first foil area 3, and specific features of the first foil area 3, such as whether there is a first gap 32, etc. The first foil groove 31 includes a first sub-groove corresponding to the first hollow area 121, a second sub-groove corresponding to the second hollow area 122, and a third sub-groove corresponding to the third hollow area 123; then according to the design, the first foil area 3 is processed by a laser die-cutting process, and then the positive electrode sheet 1, the negative electrode sheet 2 and the isolation film are wound and combined to form a cylindrical bare battery cell. At this time, the first sub-grooves are superimposed in sequence to form the first hollow area 121, the second sub-grooves are superimposed in sequence to form the second hollow area 122, and the third sub-grooves are superimposed in sequence to form the third hollow area 123, and the copper / aluminum full-pole ears at the ends are flattened or patted; then avoiding or perpendicular to the hollow area, the dense parts of the copper / aluminum full-pole ears of the cylindrical bare battery cell are flattened or patted and welded with the corresponding collector plate. When the first hollow area 121, the second hollow area 122 and the third hollow area 123 are arranged in the negative electrode ear area 22, the design and manufacturing principles of the positive electrode sheet 1 and the negative electrode sheet 2 are similar, the difference is that the second foil area 4 of the negative electrode sheet 2 is die-cut according to the design requirements.

[0040] Embodiment 2

[0041] The difference between this embodiment and the first embodiment is that the fourth hollow area 221 and the fifth hollow area 222 are staggeredly arranged on the other of the positive and negative electrode ear areas 12 and 22, and the fourth hollow area 221 and the fifth hollow area 222 are respectively located in the inner area and the outer area of ​​the other of the positive and negative electrode ear areas 12 and 22. Figure 6 to Figure 7 As shown, by providing the fourth hollow area 221 and the fifth hollow area 222, the electrolyte seepage rate is further increased, thereby improving the battery's production capacity.

[0042] Further, such as Figure 6 to Figure 7 As shown, a sixth hollow area 223 is also arranged on the other pole ear area in the positive pole ear area 12 and the negative pole ear area 22. The sixth hollow area 223 is staggered with the fourth hollow area 221 and the fifth hollow area 222. The sixth hollow area 223 is located in the middle area between the inner area and the outer area on the other pole ear area in the positive pole ear area 12 and the negative pole ear area 22.

[0043] Specifically, the fourth hollow area 221, the fifth hollow area 222 and the sixth hollow area 223 in the present embodiment have the same structure and production process as the first hollow area 121, the second hollow area 122 and the third hollow area 123, respectively. The arrangement, structure and production process of the first hollow area 121, the second hollow area 122 and the third hollow area 123 in the present embodiment are the same as the arrangement, structure and production process of the first hollow area 121, the second hollow area 122 and the third hollow area 123 in Example 1, and are not repeated here. Of course, the specific structure of the fourth hollow area 221, the fifth hollow area 222 and the sixth hollow area 223 can also be adjusted according to actual needs.

[0044] Embodiment 3

[0045] like Figures 8 to 9 As shown, an embodiment of the utility model provides a segmented full-pole lug bare cell 10 of a power battery, comprising a negative electrode sheet 2, a separator and a positive electrode sheet 1 which are stacked in sequence, the negative electrode sheet 2 comprising a negative electrode coating area 21 and a negative electrode lug area 22, the positive electrode sheet 1 comprising a positive electrode coating area 11 and a positive electrode lug area 12, the positive electrode lug area 12 and the negative electrode lug area 22 are distributed at both ends of the full-pole lug bare cell 10, and a first hollow area 121 and a second hollow area 122 are staggeredly arranged on one of the positive electrode lug area 12 and the negative electrode lug area 22, the first hollow area 121 and the second hollow area 122 are respectively located on the inner area and the outer area of ​​one of the positive electrode lug area 12 and the negative electrode lug area 22.

[0046] Specifically, the full-pole lug bare cell 10 is formed by stacking a negative electrode sheet 2, an isolation film and a positive electrode sheet 1, and after winding, the positive lug area 12 and the negative lug area 22 are respectively located at the two ends of the full-pole lug bare cell 10, and the positive lug area 12 and the negative lug area 22 are both in a multi-turn ring shape from the inside to the outside, and the positive lug area 12 and the negative lug area 22 have an outer area close to the outside in the radial direction, an inner area close to the inside, and an intermediate area between the inner area and the outer area, and the first hollow area 121 and the second hollow area 122 can be evenly distributed on the positive lug area 12, or evenly distributed on the negative lug area 22.

[0047] In this embodiment, the first hollow area 121 and the second hollow area 122 are arranged on the inner area and the outer area of ​​at least one of the positive ear area 12 and the negative ear area 22. When the electrolyte is injected, the positive electrode coating area 11 and the negative electrode coating area 21 can quickly penetrate and absorb the electrolyte through the first hollow area 121 and the second hollow area 122, which is beneficial to improve the consistency and speed of the positive electrode sheet 1 and the negative electrode sheet 2 to penetrate and absorb the electrolyte, improve the cycle life of the battery, reduce the electrolyte injection time during battery production, and improve the battery production capacity. In addition, the first hollow area 121 and the second hollow area 122 are staggered and arranged in the inner area and the outer area respectively, which can avoid and eliminate the violent resonance of the overall thickness when the pressure head of the flattening equipment flattens the negative ear area 22 and the positive ear area 12, and the situation that a large amount of metal chips are generated by impacting the cut edges of the first hollow area 121 and the second hollow area 122, thereby improving the battery safety problem caused by a large amount of metal chips when the bare battery cell is flattened.

[0048] In the embodiment of the utility model, a seventh hollow area 224 is further arranged on the other of the positive and negative lug areas 12 and 22, and the seventh hollow area 224 is located in the middle area of ​​the other of the positive and negative lug areas 12 and 22. Specifically, in the present embodiment, the first hollow area 121 and the second hollow area 122 are arranged on one of the positive and negative lug areas 12 and 22, and the seventh hollow area 224 is arranged on the other of the positive and negative lug areas 12 and 22, that is, the seventh hollow area 224 and the first hollow area 121 and the second hollow area 122 are arranged at both ends of the full lug bare battery cell 10, and this design can also increase the electrolyte seepage rate and improve the battery production capacity.

[0049] Specifically, the first hollow area 121 and the second hollow area 122 in the present embodiment are respectively the same in structure and production process as the first hollow area 121 and the second hollow area 122 in the first embodiment, which will not be repeated here. The seventh hollow area 224 in the present embodiment is arranged at both ends of the full-pole tab bare battery cell 10 with the first hollow area 121 and the second hollow area 122, and the structure of the seventh hollow area 224 is the same as the structure of the third hollow area 123 in the first embodiment. Of course, the specific structure of the seventh hollow area 224 in the present embodiment can be adjusted according to actual needs.

[0050] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A segmented full-tab bare cell for a power battery, characterized in that: It includes a negative electrode sheet, a separator and a positive electrode sheet stacked in sequence, the negative electrode sheet includes a negative electrode coating area and a negative electrode ear area, the positive electrode sheet includes a positive electrode coating area and a positive electrode ear area, the positive electrode ear area and the negative electrode ear area are distributed at both ends of the full-electrode ear bare battery cell, and a first hollow area and a second hollow area are staggeredly arranged on one of the positive electrode ear area and the negative electrode ear area, and the first hollow area and the second hollow area are respectively located in the inner area and the outer area of ​​one of the positive electrode ear area and the negative electrode ear area.

2. The segmented full-tab bare cell of the power battery according to claim 1, characterized in that: A third hollow area is also arranged on one of the positive electrode ear area and the negative electrode ear area, and the third hollow area is staggered with the first hollow area and the second hollow area. The third hollow area is located in the middle area between the inner area and the outer area on one of the positive electrode ear area and the negative electrode ear area.

3. The segmented full-tab bare cell of the power battery according to claim 2, characterized in that: A fourth hollow area and a fifth hollow area are staggeredly arranged on the positive electrode lug area and the other one of the negative electrode lug areas. The fourth hollow area and the fifth hollow area are respectively located in the inner area and the outer area of ​​the positive electrode lug area and the other one of the negative electrode lug area.

4. The segmented full-tab bare cell of the power battery according to claim 3, characterized in that: A sixth hollow area is also arranged on the other one of the positive pole ear area and the negative pole ear area. The sixth hollow area is staggered with the fourth hollow area and the fifth hollow area. The sixth hollow area is located in the middle area between the inner area and the outer area on the other one of the positive pole ear area and the negative pole ear area.

5. The segmented full-tab bare cell of the power battery according to claim 1, characterized in that: A seventh hollow region is further arranged on the other one of the positive electrode lug region and the negative electrode lug region, and the seventh hollow region is located in the middle region of the other one of the positive electrode lug region and the negative electrode lug region.

6. The segmented full-tab bare cell of the power battery according to claim 2, characterized in that: The inner region, the middle region, and the outer region are continuously distributed, the first hollow region runs through the inner region, the third hollow region runs through the middle region, and the second hollow region runs through the outer region.

7. The segmented full-tab bare cell of the power battery according to claim 2, characterized in that: The inner area, the middle area and the outer area are distributed continuously, the first hollow area runs through the inner area, the second hollow area runs through the outer area, the third hollow area includes at least two sub-hollow areas arranged in a staggered manner, the middle area includes at least two sub-areas corresponding to the at least two sub-hollow areas, the at least two sub-areas are distributed continuously, and the at least two sub-hollow areas respectively run through the corresponding sub-areas.

8. The segmented full-tab bare cell of the power battery according to claim 2, characterized in that: The full-tab bare battery cell is a cylindrical bare battery cell, the first hollow area and the second hollow area are located within the range of a first central angle, the third hollow area is located within the range of a second central angle diagonal to the first central angle, and the angle between the first central angle and the second central angle is greater than or equal to 30 degrees and less than or equal to 90 degrees.

9. The segmented full-tab bare cell of the power battery according to claim 2, characterized in that: The included angle of the first hollow area is greater than or equal to 4 degrees and less than or equal to 6 degrees, the included angle of the third hollow area is greater than or equal to 3 degrees and less than or equal to 5 degrees, the included angle of the second hollow area is greater than or equal to 2 degrees and less than or equal to 4 degrees, the included angle of the second hollow area is smaller than the included angle of the third hollow area, and the included angle of the third hollow area is smaller than the included angle of the first hollow area.

10. The segmented full-tab bare cell of the power battery according to claim 9, characterized in that: The full-tab bare cell has a first radius, the length of the first hollow area is greater than or equal to one-fifth of the first radius, the length of the second hollow area is greater than or equal to one-fifth of the first radius, the length of the third hollow area is greater than or equal to one-fifth of the first radius, and the sum of the length of the first hollow area, the length of the second hollow area and the length of the third hollow area is equal to the first radius.

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