Pole piece assembly, full-tab battery cell, battery module, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a pole piece assembly, a full-tab battery cell, a battery module, a battery pack and electric equipment, the pole piece assembly comprises a positive pole piece, a negative pole piece and a diaphragm, the positive pole piece is provided with a positive coating area and an insulating layer area; the positive pole piece is provided with a positive pole coating area, the negative pole piece is provided with a negative pole coating area, the width of the negative pole coating area is larger than that of the positive pole coating area, the insulating layer area is arranged at the edge of the positive pole coating area, and the sum of the width of the insulating layer area and the width of the positive pole coating area is consistent with the width of the negative pole coating area; and the diaphragm is arranged between the positive pole piece and the negative pole piece. According to the scheme provided by the invention, a gap can be prevented from appearing in an overhang area between the positive pole piece and the negative pole piece when the pole piece is wound, so that metal scraps and the like can be prevented from entering the battery, and the application safety of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a pole piece assembly, a full-tab battery cell, a battery module, a battery pack, and electrical equipment. Background Art

[0002] In battery design, in order to ensure that the negative electrode has enough lithium insertion space to avoid lithium plating, the size of the negative electrode plate is generally larger than that of the positive electrode plate to form an overhang area; the same is true for full-ear cylindrical batteries, the negative electrode must have an area margin in both the length and width directions. In the production process of full-ear cylindrical batteries, the full-ear is usually processed by flattening the ears. During the flattening process of the winding core ears, by-products such as metal shavings may enter the overhang area, which can easily pierce the diaphragm and cause safety hazards. Utility Model Content

[0003] In order to overcome at least one disadvantage of the above-mentioned prior art, the purpose of the present application is to provide a pole piece assembly, a full-tab battery cell, a battery module, a battery pack and an electrical device.

[0004] The technical means adopted by this application to solve the above technical problems are:

[0005] On the one hand, an embodiment of the present application provides a pole piece assembly, comprising:

[0006] A positive electrode plate, wherein the positive electrode plate is provided with a positive electrode coating area and an insulating layer area;

[0007] A negative electrode plate, wherein a negative electrode coating area is provided on the negative electrode plate, the width of the negative electrode coating area is greater than the width of the positive electrode coating area, the insulating layer area is provided at the edge of the positive electrode coating area, and the sum of the widths of the insulating layer area and the positive electrode coating area is consistent with the width of the negative electrode coating area;

[0008] The diaphragm is arranged between the positive electrode sheet and the negative electrode sheet.

[0009] In the embodiment scheme of the present application, by setting the insulating layer area, the sum of the widths of the insulating layer area and the positive electrode coating area is consistent with the width of the negative electrode coating area, thereby avoiding the formation of gaps in the overhang area between the positive electrode sheet and the negative electrode sheet when the electrode sheet is wound, thereby avoiding the entry of metal debris and the like, thereby improving the application safety of the battery.

[0010] In some embodiments, a positive electrode tab region is further disposed on the positive electrode plate, and a negative electrode tab region is disposed on the negative electrode plate, and the positive electrode tab region and the negative electrode tab region are disposed in opposite directions.

[0011] In the embodiment of the present application, by arranging the positive electrode tab region and the negative electrode tab region to face in opposite directions, the winding application between the positive electrode sheet and the negative electrode sheet can be facilitated.

[0012] In some embodiments, the insulating layer region includes a first insulating region and a second insulating region, the first insulating region is arranged between the positive electrode coating region and the positive electrode tab region, and the second insulating region is arranged on a side of the positive electrode coating region away from the positive electrode tab region.

[0013] In the embodiment of the present application, by setting the first insulating region and the second insulating region, the reliability of the positive electrode sheet and the negative electrode sheet after winding can be improved.

[0014] In some embodiments, the thickness of the insulating layer region is adapted to the thickness of the positive electrode coating region.

[0015] In the embodiment of the present application, by designing the thickness of the insulating layer region, it is possible to improve the fit between the positive electrode sheet and the negative electrode sheet after winding.

[0016] In some embodiments, the width of the separator is greater than the width of the negative electrode coating region.

[0017] In some embodiments, the edge of the separator is 0.5-1 mm higher than the edge of the negative electrode coating area.

[0018] In the embodiment of the present application, by designing the width of the diaphragm, it is possible to facilitate full coverage of the negative electrode coating area by the diaphragm.

[0019] On the other hand, an embodiment of the present application provides a full-tab battery cell, in which the pole piece assembly as described above is arranged.

[0020] On the other hand, an embodiment of the present application provides a battery module, in which the full-tab battery cell as described above is arranged.

[0021] On the other hand, an embodiment of the present application provides a battery pack, in which the full-tab battery cell as described above is arranged;

[0022] Or, a battery module as described above is arranged therein.

[0023] On the other hand, an embodiment of the present application provides an electrical device, which is provided with a battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the assembly of an example lower pole piece assembly of the present application.

[0026] Figure 2 This is a schematic structural diagram of the positive electrode plate in one example of the present application.

[0027] Figure 3 This is a schematic diagram of the structure of the negative electrode plate in one example of the present application.

[0028] Marking Description:

[0029] 1-positive electrode plate, 11-positive electrode coating area, 12-insulating layer area, 121-first insulating area, 122-second insulating area, 13-positive electrode ear area;

[0030] 2-negative electrode sheet, 21-negative electrode coating area, 22-negative electrode ear area;

[0031] 3- diaphragm;

[0032] 4-overhang area. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention.

[0034] It should be noted that: unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0035] like Figure 1-3 As shown, this embodiment provides a pole piece assembly, including a positive pole piece 1, a negative pole piece 2 and a separator 3; wherein the separator 3 is arranged between the positive pole piece 1 and the negative pole piece 2, so as to facilitate the bonding and winding operations between the positive pole piece 1 and the negative pole piece 2.

[0036] In some embodiments, a positive electrode coating area 11 and an insulating layer area 12 are provided on the positive electrode plate 1, and a negative electrode coating area 21 is provided on the negative electrode plate 2; the width of the negative electrode coating area 21 is greater than the width of the positive electrode coating area 11, so that an overhang area 4 is formed after the positive electrode plate 1 and the negative electrode plate 2 are bonded together.

[0037] The insulating layer area 12 is arranged at the edge of the positive electrode coating area 11, and the sum of the widths of the insulating layer area 12 and the positive electrode coating area 11 is consistent with the width of the negative electrode coating area 21; so that the insulating layer area 12 can fill the formed overhang area 4.

[0038] In some embodiments, the insulating layer region 12 may be made of inorganic ceramic materials such as zirconia ceramics and alumina ceramics.

[0039] By setting the insulating layer area 12 and making the sum of the widths of the insulating layer area 12 and the positive electrode coating area 11 consistent with the width of the negative electrode coating area 21, it is possible to avoid the formation of gaps in the overhang area 4 between the positive electrode sheet 1 and the negative electrode sheet 2 when the electrodes are wound, thereby avoiding the entry of metal debris and the like, thereby improving the application safety of the battery.

[0040] As one application example, a positive electrode tab area 13 is further provided on the positive electrode plate 1, and the positive electrode coating area 11, the insulating layer area 12 and the positive electrode tab area 13 are all arranged along the length direction of the positive electrode plate 1. Figure 2 shown.

[0041] A negative electrode tab region 22 is disposed on the negative electrode plate 2. The negative electrode coating region 21 and the negative electrode tab region 22 are also disposed along the length direction of the negative electrode plate 2. Figure 3 shown.

[0042] In some embodiments, the positive electrode tab region 13 and the negative electrode tab region 22 are arranged in opposite directions. By arranging the positive electrode tab region 13 and the negative electrode tab region 22 in opposite directions, it is convenient to realize the winding application between the positive electrode sheet 1 and the negative electrode sheet 2, such as in a full-tab cylindrical battery cell.

[0043] As one application example, the insulating layer area 12 includes a first insulating area 121 and a second insulating area 122. The first insulating area 121 is arranged between the positive electrode coating area 11 and the positive electrode lug area 13, and the second insulating area 122 is arranged on the side of the positive electrode coating area 11 away from the positive electrode lug area 13.

[0044] By setting the first insulating area 121 and the second insulating area 122, the reliability of the positive electrode sheet 1 and the negative electrode sheet 2 after winding can be improved; at this time, the insulating layer area 12 can be formed on both the upper and lower sides of the positive electrode coating area 11, so as to avoid the falling of metal debris during the tab flattening operation, which may cause safety hazards.

[0045] In some embodiments, the thickness of the insulating layer region 12 is adapted to the thickness of the positive electrode coating region 11 ; for example, the thickness of the insulating layer region 12 and the thickness of the positive electrode coating region 11 may be set to be consistent.

[0046] By designing the thickness of the insulating layer region 12 , the degree of adhesion between the positive electrode sheet 1 and the negative electrode sheet 2 after winding can be improved.

[0047] In some embodiments, the width of the separator 3 is set to be greater than the width of the negative electrode coating area 21 ; for example, the edge of the separator 3 is 0.5-1 mm higher than the edge of the negative electrode coating area 21 .

[0048] By designing the width of the separator 3 , it is possible to facilitate full coverage of the negative electrode coating area 21 by the separator 3 , thereby improving application reliability.

[0049] On the other hand, this embodiment provides a full-tab battery cell, in which the pole piece assembly as described above is arranged.

[0050] By applying the pole piece assembly in the full-tab battery cell, it is possible to improve the safety protection level of the full-tab battery cell during the tab flattening operation, avoid metal debris that may be generated during the flattening process from falling into the overhang area 4 between the tabs, and avoid safety hazards caused by metal debris piercing the diaphragm 3, thereby improving the use effect of the full-tab battery cell.

[0051] On the other hand, this embodiment provides a battery module, in which the full-tab battery cell as described above is arranged.

[0052] By applying the full-tab battery cell in the battery module, the battery module can have better safety performance based on the anti-falling effect of metal debris.

[0053] On the other hand, the present embodiment provides a battery pack, in which the full-tab battery cell as described above is arranged; or, in which the battery module as described above is arranged.

[0054] By applying the full-tab battery cell or the battery module in the battery pack, the safety application performance of the battery pack can be improved.

[0055] On the other hand, this embodiment also provides an electrical device, such as an electric vehicle, etc., in which the battery pack as described above is arranged.

[0056] By applying the battery pack to the electrical equipment, the safety application performance of the electrical equipment can be improved and the market competitiveness can be enhanced.

[0057] The above description is only a specific implementation mode of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should also be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection of the claims.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A pole piece assembly, characterized in that: include: A positive electrode plate, wherein the positive electrode plate is provided with a positive electrode coating area and an insulating layer area; A negative electrode plate, wherein a negative electrode coating area is provided on the negative electrode plate, the width of the negative electrode coating area is greater than the width of the positive electrode coating area, the insulating layer area is provided at the edge of the positive electrode coating area, and the sum of the widths of the insulating layer area and the positive electrode coating area is consistent with the width of the negative electrode coating area; The diaphragm is arranged between the positive electrode sheet and the negative electrode sheet.

2. The pole piece assembly according to claim 1, characterized in that: The positive electrode plate is also provided with a positive electrode tab region, and the negative electrode plate is provided with a negative electrode tab region, and the positive electrode tab region and the negative electrode tab region are arranged in opposite directions.

3. The pole piece assembly according to claim 2, characterized in that: The insulating layer region includes a first insulating region and a second insulating region. The first insulating region is arranged between the positive electrode coating region and the positive electrode tab region, and the second insulating region is arranged on a side of the positive electrode coating region away from the positive electrode tab region.

4. The pole piece assembly according to any one of claims 1 to 3, characterized in that: The thickness of the insulating layer region is adapted to the thickness of the positive electrode coating region.

5. The pole piece assembly according to claim 4, characterized in that: The width of the separator is greater than the width of the negative electrode coating region.

6. The pole piece assembly according to claim 5, characterized in that: The edge of the separator is 0.5-1 mm higher than the edge of the negative electrode coating area.

7. A full-tab battery cell, characterized in that: A pole piece assembly as described in any one of claims 1 to 6 is arranged therein.

8. A battery module, characterized in that: A full-tab battery cell as described in claim 7 is arranged therein.

9. A battery pack, characterized in that: A full-tab battery cell as claimed in claim 7 is arranged therein; Or, a battery module as claimed in claim 8 is arranged therein.

10. An electrical device, characterized in that: A battery pack as claimed in claim 9 is arranged therein.

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