Battery roll core convenient for rapid liquid injection
By dividing and cutting the pole ear zones of the battery core electrode sheet to form the central and peripheral liquid injection zones, the problem of difficulty in injection of the traditional battery core electrolyte is solved, and the rapid injection and efficient production of the electrolyte are achieved.
Patent Information
- Application Number
- CN202421946711.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-13
AI Technical Summary
The full coverage of traditional battery coil cores makes it difficult to inject electrolyte, requiring expensive precision liquid injection equipment and low liquid injection efficiency.
The pole ear area of the pole sheet is divided into section A, section B and section C. Section A is cut off, and multiple cut grooves and pole ears are set up in section B. Section C is retained to form the pole ear, forming the central and peripheral liquid injection areas, simplifying the pole ear structure for electrolyte injection.
The rapid injection of electrolyte is achieved through the central and peripheral liquid injection areas, shortening the liquid injection time, improving the liquid injection efficiency, reducing dependence on precision liquid injection equipment, and reducing production costs.
Smart Images
Figure CN222995450U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a battery core, in particular to a battery core convenient for rapid liquid injection. Background Art
[0002] At present, a battery core is formed by laminating and winding two strip-shaped electrode plates and a separator paper spaced between the two electrode plates along the same winding direction into a columnar structure. A coating area and an ear area are provided on the surface of each electrode plate, and the ear areas of the two electrode plates respectively extend from both ends of the columnar structure after the battery core is wound and formed, and a positive ear and a negative ear are formed by flattening or cutting and overlapping, and then the positive and negative ears are welded to positive and negative current collectors respectively arranged at both ends of the battery core to output positive and negative currents respectively. However, the traditional positive ear or negative ear is all flattened or cut and overlapped to cover both ends of the battery core. It is found in actual use that these fully covered ears will greatly affect the injection of electrolyte into the battery core, which not only requires expensive precision liquid injection equipment, but also has a long injection time of the electrolyte and extremely low injection efficiency. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a battery core convenient for rapid injection of electrolyte.
[0004] The technical problem of the utility model is realized by the following technical solutions:
[0005] A battery core convenient for rapid liquid injection is formed by laminating and winding two strip-shaped electrode plates and a separator paper spaced between the two electrode plates along the same winding direction into a columnar structure. A coating area and an ear area are provided on the surface of each electrode plate, and the ear areas of the two electrode plates respectively extend from both ends of the columnar structure. The ear area of each electrode plate is sequentially divided into section A, section B, and section C from the winding start end to the winding end of the electrode plate; the ear area of section A is cut off, and after the battery core is wound and formed, middle liquid injection areas are respectively formed on both end faces of the columnar structure; a plurality of spaced slits and ears are arranged along the winding direction of the electrode plate in the ear area of section B, and the plurality of slits are overlapped with each other after the battery core is wound and formed, and peripheral liquid injection areas are respectively formed on both end faces of the columnar structure, and the plurality of ears are overlapped and flattened with each other after the battery core is wound and formed, and welding areas are respectively formed on both end faces of the columnar structure; the ear area of section C is reserved to form an ear, and after the battery core is wound and formed, peripheral ear areas are respectively formed on the peripheries of both end faces of the columnar structure, and the ears in the peripheral ear areas are also flattened together.
[0006] The middle liquid injection area and the peripheral liquid injection area are integrated; the welding area and the peripheral ear area are integrated.
[0007] The positions of the peripheral liquid injection areas at both ends of the columnar structure are exactly opposite, and the positions of the welding areas at both ends of the columnar structure are also exactly opposite.
[0008] A mandrel hole that penetrates axially is provided at the center of the middle liquid injection area.
[0009] Each of the slotted grooves and the adjacent tab together form a set of winding circumferences, and the winding circumferences increase correspondingly as the diameter of the battery core increases.
[0010] The tab area of the A section is cut off by die cutting or laser cutting, and the slotted grooves of the B section are cut by die cutting or laser cutting.
[0011] Compared with the prior art, in the present utility model, the tab area of each electrode sheet that constitutes the winding and forming of the battery core is sequentially divided into section A, section B, and section C from the winding starting end to the winding ending end of the electrode sheet, and the tab area of section A is cut off. Thus, after the battery core is wound and formed, middle liquid injection areas can be respectively formed at both ends of the battery core; the tab area of section B is provided with a plurality of slotted grooves and tabs arranged at intervals along the winding direction of the electrode sheet, and the plurality of slotted grooves overlap each other after the battery core is wound and formed, so that peripheral liquid injection areas are respectively formed at both ends of the battery core. The plurality of tabs overlap and are flattened with each other after the battery core is wound and formed, and welding areas are respectively formed at both ends of the battery core; the tab area of section C is reserved to form tabs, and after the battery core is wound and formed, peripheral tab areas are respectively formed at the peripheries of both ends of the battery core, and the tabs in the peripheral tab areas are also flattened together. In this way, since the middle liquid injection area and the peripheral liquid injection area on the end face of the battery core do not cover the tabs, the electrolyte can be conveniently and quickly injected into the battery core through the middle liquid injection area and the peripheral liquid injection area, thereby shortening the injection time of the electrolyte and improving the injection efficiency, and there is no need to use overly expensive precision liquid injection equipment, saving the production cost of the product; at the same time, the remaining areas on the end face of the battery core serve as welding areas for flattening the tabs, and can also be welded to the current collector, ensuring the normal use of the battery core; therefore, the improved battery core combined with the corresponding winding manufacturing method can further improve the production efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic structural diagram of the battery core of the present utility model after being wound and formed without flattening the tabs.
[0013] Figure 2 It is Figure 1 the A - A cross-sectional view of
[0014] Figure 3 It is Figure 1 the top view of
[0015] Figure 4 is Figure 1 a perspective view of
[0016] Figure 5 a schematic structural view of the battery core of the present utility model after winding and flattening the tabs.
[0017] Figure 6 is Figure 5 a top view of
[0018] Figure 7 a schematic structural view of two strip-shaped electrode sheets constituting the battery core in an unfolded and separated state.
[0019] Figure 8 a schematic structural view of one of the electrode sheets.
[0020] Figure 9 is Figure 8 an enlarged view at position B of
[0021] Figure 10 is Figure 9 a schematic structural view of removing the indication marking line in Detailed implementation manners
[0022] The embodiments of the present utility model will be further described in detail with reference to the above-mentioned drawings.
[0023] As Figures 1 to 10 shown, 11. mandrel hole, 12. middle liquid injection area, 13. peripheral liquid injection area, 14. welding area, 15. peripheral tab area, 2. electrode sheet, 21. coating area, 22. tab area, 221. tab, 222. slotted groove.
[0024] A battery core facilitating rapid liquid injection, which is mainly applicable to lithium batteries. It is a columnar structure formed by laminating and winding two strip-shaped electrode sheets 2 and a separator paper spaced between the two electrode sheets 2 along the same winding direction, such as a cylindrical or square shape, etc. The two electrode sheets 2 mainly refer to the positive electrode sheet and the negative electrode sheet.
[0025] Among them, a coating area 21 and a tab area 22 are provided on the surface of each electrode sheet 2. The tab area refers to the blank area on the surface of the electrode sheet 2 where no coating is applied. Usually, the coating area 21 occupies the lower or upper part of the electrode sheet surface, and the remaining part of the electrode sheet surface serves as the tab area 22. And after the battery core is wound and formed, the tab areas 22 of the two electrode sheets 2 will respectively extend out from both ends of the columnar structure.
[0026] At the same time, the tab area 22 of each electrode sheet 2 is sequentially divided into section A, section B, and section C from the winding start end to the winding end of the electrode sheet.
[0027] The tab area 22 of the A section needs to be cut off, that is, cut off by means of die cutting or laser cutting, etc. The cut-off tab area 22 can be completely cut to the coating area 21, or cut to a blank area with a short part left from the coating area 21. After the battery core is wound and formed, middle liquid injection areas 12 are respectively formed on both end faces of the columnar structure.
[0028] For the B section, a plurality of spaced slits 222 and tabs 221 are arranged along the winding direction of the pole piece 2. Each slit can also be cut by means of die cutting or laser cutting, etc. The cut slits 222 can be completely cut to the coating area 21, or cut to a blank area with a short part left from the coating area 21. After the battery core is wound and formed, the plurality of slits 222 overlap each other, so that outer liquid injection areas 13 are respectively formed on both end faces of the columnar structure. And the plurality of tabs 221 overlap and are flattened with each other after the battery core is wound and formed, and welding areas 14 are respectively formed on both end faces of the columnar structure.
[0029] Each of the described slits 222 and the adjacent tab 221 together form a set of winding circumferences, such as Figure 9 X1, X2, X3, etc. shown, and this winding circumference will increase correspondingly as the diameter size of the battery core increases.
[0030] For the C section, the tab area 22 is retained to form tabs 221. After the battery core is wound and formed, outer tab areas 15 are respectively formed on the peripheries of both end faces of the columnar structure. The tabs 221 in the outer tab areas are also flattened together.
[0031] In this way, the middle liquid injection area 12 and the outer liquid injection area 13 are connected as a whole to facilitate the rapid injection of the electrolyte. And the welding area 14 and the outer tab area 15 are also connected as a whole. The welding area 14 can be used to weld a current collector (not shown in the figure), and the outer tab area 15 can be fixed by rolling grooves when the battery core is installed in the battery case, ensuring the reliability of the electrical conductivity.
[0032] At the center of the middle liquid injection area 12, there is an axially penetrating mandrel hole 11, that is, the mandrel hole 11 needs to be reserved before winding the A section, which is convenient for the installation of the battery mandrel.
[0033] In addition, the positions of the outer liquid injection areas 13 on both end faces of the columnar structure are exactly opposite, and the positions of the welding areas 14 on both end faces of the columnar structure are also exactly opposite. The purpose is to facilitate liquid injection and automated processing and manufacturing on the production line.
[0034] A winding manufacturing method for a battery core facilitating rapid liquid injection mainly includes the following steps:
[0035] Step 1: Select two strip-shaped electrode plates 2 with the same size. A coating area 21 and a tab area 22 are provided on the surface of each electrode plate.
[0036] Step 2: Divide the tab area 22 of each electrode plate 2. That is, the tab area 22 of each electrode plate 2 is sequentially divided into section A, section B, and section C from the winding start end to the winding end of the electrode plate. Cut off the tab area of section A, arrange a plurality of spaced slits 222 and tabs 221 along the winding direction of the electrode plate in the tab area of section B, and retain the tab area 22 of section C to form tabs 221.
[0037] Step 3: After laminating two electrode plates 2 made according to Step 2 and a separator paper spaced between the two electrode plates 2, expose the tab area 22 of one electrode plate 2 upward and the tab area 22 of the other electrode plate 2 downward, and then layer and wind them into a columnar structure along the same winding direction, so that the tab areas 22 of the two electrode plates 2 extend from both ends of the columnar structure respectively.
[0038] Step 4: After the battery core is wound and formed, middle liquid injection areas 12 will be formed on both end faces of the columnar structure respectively. A mandrel hole 11 that axially penetrates is reserved at the center of the middle liquid injection area. The plurality of slits 222 in section B overlap each other after the battery core is wound and formed, and peripheral liquid injection areas 13 are formed on both end faces of the columnar structure respectively. The plurality of tabs 221 in section B overlap and are flattened after the battery core is wound and formed, and welding areas 14 are formed on both end faces of the columnar structure respectively. After the battery core is wound and formed, peripheral tab areas 15 will be formed on the peripheries of both end faces of the columnar structure respectively, and the tabs 221 in the peripheral tab area are also flattened together.
[0039] Step 5: After the battery core is wound and formed, the positions of the peripheral liquid injection areas 13 on both end faces of the columnar structure are exactly opposite, and the positions of the welding areas 14 on both end faces of the columnar structure are also exactly opposite.
[0040] Step 6: The middle liquid injection area 12 and the peripheral liquid injection area 13 are connected into one body to facilitate rapid injection of electrolyte. The welding area 14 and the peripheral tab area 15 are connected into one body. After a current collector is arranged at the end of the battery core, the current collector is directly welded to the welding area 14.
[0041] Since neither the central liquid injection area 12 nor the peripheral liquid injection area 13 at the end face of the battery core covers the tab 221, the electrolyte can be conveniently and quickly injected into the battery core through the central liquid injection area 12 and the peripheral liquid injection area 13, thus shortening the electrolyte injection time and improving the liquid injection efficiency. There is no need to use expensive precision liquid injection equipment, saving the production cost of the product. Moreover, the remaining area of the end face of the battery core serves as the welding area 14 for flattening the tab, which can also be welded to the current collector, ensuring the normal use of the battery core. Therefore, the improved battery core combined with the corresponding winding manufacturing method can further improve the production efficiency of the battery.
[0042] The above are only specific embodiments of the present invention. Those skilled in the art should understand that any structural design equivalent to this embodiment should be included within the protection scope of the present invention.
Claims
1. A battery winding core that facilitates rapid liquid injection, comprising a columnar structure formed by stacking two long strips of pole pieces (2) and a separator paper spaced between the two pole pieces (2), and winding them in layers along the same winding direction, wherein a coating area (21) and a tab area (22) are provided on the surface of each pole piece (2), and the tab areas (22) of the two pole pieces (2) extend from both ends of the columnar structure, respectively, and characterized in that: The pole ear region (22) of each pole piece (2) is divided into section A, section B and section C in sequence from the winding start end to the winding end end of the pole piece; The tab area (22) of the A section is cut off, and after the battery core is wound and formed, middle liquid injection areas (12) are formed on both end surfaces of the columnar structure; The pole ear area (22) of the B section is provided with a plurality of spaced cutting grooves (222) and pole ears (221) along the winding direction of the pole piece (2); the plurality of cutting grooves (222) overlap with each other after the battery core is wound and formed, and form peripheral liquid injection areas (13) at both end surfaces of the columnar structure; the plurality of pole ears (221) overlap with each other and are flattened after the battery core is wound and formed, and form welding areas (14) at both end surfaces of the columnar structure; The pole ear area (22) of the C section is retained to form a pole ear (221), and after the battery core is wound and formed, peripheral pole ear areas (15) are respectively formed on the periphery of the two end surfaces of the columnar structure, and the pole ears (221) of the peripheral pole ear areas are also flattened together.
2. A battery roll core for quick liquid injection according to claim 1, characterized in that The central liquid injection area (12) and the peripheral liquid injection area (13) are connected as a whole; and the welding area (14) and the peripheral tab area (15) are connected as a whole.
3. A battery roll core for quick liquid injection according to claim 1, characterized in that The positions of the peripheral liquid injection areas (13) at both end surfaces of the columnar structure are exactly opposite to each other, and the positions of the welding areas (14) at both end surfaces of the columnar structure are also exactly opposite to each other.
4. A battery roll core for quick liquid injection according to claim 1, characterized in that An axially penetrating core rod hole (11) is provided at the center of the middle liquid injection area (12).
5. The battery roll core for quick liquid injection according to claim 1, characterized in that Each of the cutting grooves (222) and the adjacent pole ears (221) together form a set of winding circumferences, and the winding circumference increases accordingly as the diameter of the battery winding core increases.
6. A battery roll core for quick liquid injection according to claim 1, characterized in that The pole ear area (22) of the A section is cut off by die cutting or laser cutting, and the cutting groove (222) of the B section is cut by die cutting or laser cutting.