Battery roll core convenient for rapid liquid injection and winding manufacturing method thereof
By dividing and cutting the pole ear zones of the electrode sheets to form the central and peripheral liquid injection zones, the problem of low injection efficiency of the traditional battery core electrolyte is solved, and the effect of rapid liquid injection and reduced production costs is achieved.
Patent Information
- Application Number
- CN202411103590.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2024-12-10
AI Technical Summary
The full coverage of traditional battery coil cores leads to inefficient electrolyte injection, requiring expensive precision liquid injection equipment, and long liquid injection time.
The pole ear area of the pole piece is divided into section A, section B and section C. Section A is cut, section B is set up to set up a cut groove, section C is retained to form the central liquid injection area and the peripheral liquid injection area, simplifying the pole ear structure for convenience The electrolyte is injected and a welding zone is formed on the end surface to ensure the use of the battery.
It realizes rapid injection of electrolyte, shortens the injection time, improves the injection efficiency, reduces production costs, and does not require the use of expensive precision injection equipment, ensuring the normal use of the battery.
Smart Images
Figure CN119108588A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a battery roll core, in particular to a battery roll core which is convenient for rapid liquid injection and a winding manufacturing method thereof. Background Art
[0002] At present, battery cores are formed by stacking two long strips of electrode sheets and a separator paper between the two electrode sheets, and then winding them in the same winding direction to form a columnar structure. The surface of each electrode sheet is provided with a coating area and a pole ear area. After the battery core is wound into shape, the pole ear areas of the two electrode sheets just extend from the two ends of the columnar structure respectively, and are formed into positive and negative pole ears by flattening or cutting and stacking. The positive and negative pole ears are then welded to the positive and negative current collectors respectively arranged at the two ends of the battery core, so as to output positive and negative current respectively. However, conventional positive or negative pole ears are all flattened or cut and stacked to cover the two ends of the battery core. In actual use, it is found that these fully covered pole ears will greatly affect the injection of electrolyte into the battery core, which not only requires the use of expensive precision injection equipment, but also the injection time of the electrolyte is long and the injection efficiency is extremely low. Summary of the invention
[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a battery coil core and a winding method thereof that facilitates rapid injection of electrolyte.
[0004] The technical problem of the present invention is achieved through the following technical solutions: A battery winding core that is convenient for rapid liquid injection is a columnar structure formed by stacking two long strips of pole pieces and a separator paper spaced between the two pole pieces, and winding them in layers along the same winding direction. The surface of each pole piece is provided with a coating area and a pole ear area, and the pole ear areas of the two pole pieces extend from the two ends of the columnar structure respectively. The pole ear area of each pole piece 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 pole ear area of section A is cut off, and after the battery winding core is wound and formed, a middle section is formed on the two end surfaces of the columnar structure respectively. The electrode ear area of the B section is provided with a plurality of spaced cutting grooves and electrode ears along the winding direction of the electrode sheet, and the plurality of cutting grooves overlap with each other after the battery core is wound and formed, and form peripheral liquid injection areas at both end surfaces of the columnar structure respectively, and the plurality of electrode ears overlap with each other and flatten with each other after the battery core is wound and formed, and form welding areas at both end surfaces of the columnar structure respectively; the electrode ear area of the C section is retained to form the electrode ears, and after the battery core is wound and formed, peripheral electrode ear areas are respectively formed at the periphery of the two end surfaces of the columnar structure, and the electrode ears in the peripheral electrode ear areas are also flattened together.
[0005] The middle liquid injection area and the peripheral liquid injection area are connected as one; the welding area and the peripheral pole ear area are connected as one.
[0006] The positions of the peripheral liquid injection areas at the two end surfaces of the columnar structure are exactly opposite to each other, and the positions of the welding areas at the two end surfaces of the columnar structure are also exactly opposite to each other.
[0007] An axially penetrating core rod hole is arranged at the center of the middle liquid injection area.
[0008] Each of the cutting grooves and the adjacent tabs together form a set of winding circumferences, and the winding circumference increases accordingly as the diameter of the battery winding core increases.
[0009] The tab area of the A section is cut off by die cutting or laser cutting, and the cutting groove of the B section is cut by die cutting or laser cutting.
[0010] A method for winding a battery core that is convenient for rapid liquid injection comprises the following steps: Step 1: Select two long strip-shaped pole pieces of the same size. A coating area and a tab area are provided on the surface of each pole piece. The tab area refers to a blank area on the surface of the pole piece that is not coated with a coating. Usually, the coating area occupies the lower or upper part of the pole piece surface, and the remaining part of the pole piece surface is used as the tab area. Step 2: Divide the pole lug area of each pole piece, that is, divide the pole lug area of each pole piece into section A, section B and section C in sequence from the winding start end to the winding end end of the pole piece, and cut off the pole lug area of section A, set a plurality of spaced cutting grooves and pole lugs in the pole lug area of section B along the winding direction of the pole piece, and retain the pole lug area of section C to form a pole lug; Step 3: stack the two pole pieces made according to step 2 and the separator paper between the two pole pieces, so that the pole ear area of one pole piece is exposed upward and the pole ear area of the other pole piece is exposed downward, and then stack and wind them into a columnar structure along the same winding direction, so that the pole ear areas of the two pole pieces extend from both ends of the columnar structure respectively; Step 4: After the battery core is wound and formed, section A will form a central liquid injection area on both end surfaces of the columnar structure, and an axially penetrating core rod hole is reserved at the center of the central liquid injection area; multiple cutting grooves of section B overlap with each other after the battery core is wound and formed, and peripheral liquid injection areas are formed on both end surfaces of the columnar structure, and multiple tabs of section B overlap and flatten with each other after the battery core is wound and formed, and welding areas are formed on both end surfaces of the columnar structure; after the battery core is wound and formed, section C will form peripheral tab areas on the periphery of both end surfaces of the columnar structure, and the tabs in the peripheral tab areas are also flattened together; Step 5: After the battery core is wound and formed, the positions of the peripheral liquid injection areas at both end surfaces of the columnar structure are exactly opposite to each other, and the positions of the welding areas at both end surfaces of the columnar structure are also exactly opposite to each other; Step 6: The middle injection area and the peripheral injection area are connected as one to facilitate rapid injection of electrolyte, and the welding area is connected as one with the peripheral tab area. After the current collector is configured at the end of the battery coil core, the current collector is directly welded to the welding area.
[0011] Compared with the prior art, the present invention mainly divides the pole ear area of each pole piece constituting the battery core winding into section A, section B and section C in sequence from the winding starting end to the winding ending end of the pole piece, and cuts off the pole ear area of section A, so that after the battery core is wound and formed, a middle liquid injection area can be formed on the two end surfaces of the battery core respectively; the pole ear area of section B is provided with a plurality of spaced cutting grooves and pole ears along the winding direction of the pole piece, and the plurality of cutting grooves are overlapped with each other after the battery core is wound and formed, so that peripheral liquid injection areas are formed on the two end surfaces of the battery core respectively, and the plurality of pole ears are overlapped and flattened with each other after the battery core is wound and formed, and welding areas are formed on the two end surfaces of the battery core respectively; the pole ear area of section C is retained to form pole ears, and after the battery core is wound and formed, peripheral pole ear areas are formed on the periphery of the two end surfaces of the battery core respectively, and the pole ears in the peripheral pole ear areas are also flattened together. In this way, since the middle injection area and the outer injection area on the end face of the battery core do not cover the pole ear, the electrolyte can be conveniently and quickly injected into the battery core through the middle injection area and the outer injection area, thereby shortening the electrolyte injection time and improving the injection efficiency. There is no need to use overly expensive precision injection equipment, saving the production cost of the product; at the same time, the remaining area of the end face of the battery core serves as the welding area for flattening the pole ear, 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 production method can further improve the production efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the structure of the battery core of the present invention that is wound and formed without flattening the pole ear.
[0013] Figure 2 for Figure 1 A-A section view.
[0014] Figure 3 for Figure 1 Top view of the .
[0015] Figure 4 for Figure 1 Stereoscopic diagram.
[0016] Figure 5 It is a schematic diagram of the structure of the battery core being wound and the tab being flattened according to the present invention.
[0017] Figure 6 for Figure 5 Top view of the .
[0018] Figure 7 It is a schematic diagram of the structure of two long strips of pole pieces constituting the battery coil core in an unfolded and separated state.
[0019] Figure 8 This is a schematic diagram of the structure of one of the pole pieces.
[0020] Fig. 9 for Figure 8 Enlarged view of point B.
[0021] Fig.10 for Fig. 9 Schematic diagram of the structure without the indicator lines. DETAILED DESCRIPTION
[0022] The embodiments of the present invention will be described in detail below with reference to the above-mentioned drawings.
[0023] like Figure 1 to Figure 10 As shown, 11. core rod hole, 12. middle liquid injection area, 13. peripheral liquid injection area, 14. welding area, 15. peripheral pole ear area, 2. pole piece, 21. coating area, 22. pole ear area, 221. pole ear, 222. cutting groove.
[0024] A battery core that is easy to quickly inject liquid and a winding production method thereof, the battery core is mainly suitable for lithium batteries, it is a columnar structure formed by stacking and winding two long strips of pole pieces 2 and a diaphragm paper spaced between the two pole pieces 2 along the same winding direction, such as a cylindrical or square shape, etc. The two pole pieces 2 mainly refer to a positive pole piece and a negative pole piece.
[0025] Among them, the surface of each pole piece 2 is provided with a coating area 21 and a lug area 22. The lug area refers to the blank area on the surface of the pole piece 2 where no coating is applied. Usually, the coating area 21 occupies the lower or upper part of the pole piece surface, and the remaining part of the pole piece surface serves as the lug area 22. After the battery core is wound and formed, the lug areas 22 of the two pole pieces 2 will extend from the two ends of the columnar structure respectively.
[0026] At the same time, the pole ear area 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.
[0027] The lug area 22 of section A needs to be cut off, that is, it needs to be cut off by mold cutting or laser cutting. The cut lug area 22 can be completely cut to the coating area 21, or it can be cut to a blank area with a shorter portion between the coating area 21 and the coating area 21. After the battery core is wound into shape, a middle liquid injection area 12 is formed on the two end faces of the columnar structure.
[0028] The pole ear area 22 of the segment B is provided with a plurality of spaced cutting grooves 222 and pole ears 221 along the winding direction of the pole piece 2, and each cutting groove can also be cut by die cutting or laser cutting, and the cut cutting grooves 222 can be cut completely to the coating area 21, or can be cut to a blank area with a shorter portion between the coating area 21, and the plurality of cutting grooves 222 overlap with each other after the battery core is wound, thereby forming peripheral liquid injection areas 13 at both end faces of the columnar structure, and the plurality of pole ears 221 overlap and flatten with each other after the battery core is wound, and form welding areas 14 at both end faces of the columnar structure.
[0029] Each cutting groove 222 and the adjacent pole ear 221 together form a set of winding circumferences, such as Fig. 9 X1, X2, X3, etc. shown, and the winding circumference will increase accordingly as the diameter of the battery core increases.
[0030] 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.
[0031] In this way, the central liquid injection area 12 and the peripheral liquid injection area 13 will be connected as one to facilitate the rapid injection of electrolyte, and the welding area 14 and the peripheral pole ear area 15 will also be connected as one. The welding area 14 can be used for welding current collectors (not shown in the figure). The peripheral pole ear area 15 can be pressed and fixed by rolling grooves when the battery roll core is loaded into the battery shell, thereby ensuring the reliability of the conductive performance.
[0032] An axially penetrating core rod hole 11 is provided at the center of the middle liquid injection area 12, that is, the core rod hole 11 needs to be reserved before the A section is wound, so as to facilitate the loading of the battery core rod.
[0033] In addition, the positions of the peripheral 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, in order to facilitate injection and automated processing and manufacturing on the production line.
[0034] A method for winding a battery core that is convenient for rapid liquid injection mainly comprises the following steps: Step 1: Select two pole pieces 2 of the same size and in the shape of long strips, and provide a coating area 21 and a pole ear area 22 on the surface of each pole piece; Step 2, dividing the pole ear area 22 of each pole piece 2, that is, the pole ear area 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, and the pole ear area of section A is cut off, and the pole ear area of section B is provided with a plurality of cutting grooves 222 and pole ears 221 arranged at intervals along the winding direction of the pole piece, and the pole ear area 22 of section C is retained to form the pole ear 221; Step 3: stack the two pole pieces 2 manufactured according to step 2 and the separator paper spaced between the two pole pieces 2, so that the pole ear area 22 of one pole piece 2 is exposed upward and the pole ear area 22 of the other pole piece 2 is exposed downward, and then stack and wind them into a columnar structure along the same winding direction, so that the pole ear areas 22 of the two pole pieces 2 extend from both ends of the columnar structure respectively; Step 4: After the battery core is wound and formed, section A will form a middle liquid injection area 12 on both end surfaces of the columnar structure, and an axially through core rod hole 11 is reserved at the center of the middle liquid injection area; multiple cutting grooves 222 of section B overlap with each other after the battery core is wound and formed, and form peripheral liquid injection areas 13 on both end surfaces of the columnar structure, and multiple pole ears 221 of section B overlap with each other and flatten after the battery core is wound and formed, and form welding areas 14 on both end surfaces of the columnar structure; after the battery core is wound and formed, section C will form peripheral pole ear areas 15 on the periphery of both end surfaces of the columnar structure, and the pole ears 221 of the peripheral pole ear areas are also flattened together; Step 5: After the battery core is wound and formed, 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; Step six: the middle injection area 12 and the peripheral injection area 13 are connected as one to facilitate rapid injection of electrolyte, the welding area 14 is connected as one with the peripheral tab area 15 , and after the current collector is arranged at the end of the battery roll core, the current collector is directly welded to the welding area 14 .
[0035] In the present invention, since the middle injection area 12 and the outer injection area 13 of the end face of the battery core do not cover the pole ear 221, the electrolyte can be conveniently and quickly injected into the battery core through the middle injection area 12 and the outer injection area 13, thereby shortening the electrolyte injection time and improving the injection efficiency, and there is no need to use overly expensive precision injection equipment, thus 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 pole ear, which can also be welded to the collector, thereby ensuring the normal use of the battery core; therefore, the improved battery core combined with the corresponding winding production method can further improve the production efficiency of the battery.
[0036] The above description is only a specific embodiment of the present invention. Those skilled in the art should understand that any structural design equivalent to this embodiment should be included in 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.
7. A method for winding a battery core that is convenient for rapid liquid injection, characterized in that The preparation method comprises the following steps: Step 1, selecting two pole pieces (2) of the same size and in the shape of long strips, each pole piece having a coating area (21) and a pole lug area (22) on its surface, wherein the pole lug area refers to a blank area on the pole piece surface that is not coated with a coating, and the coating area (21) usually occupies the lower part or the upper part of the pole piece surface, and the remaining part of the pole piece surface serves as the pole lug area (22); Step 2, dividing the pole ear region (22) of each pole piece (2), that is, the pole ear region of each pole piece 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, and the pole ear region (22) of section A is cut off, and the pole ear region (22) of section B is provided with a plurality of cutting grooves (222) and pole ears (221) arranged at intervals along the winding direction of the pole piece, and the pole ear region (22) of section C is retained to form the pole ears (221); Step 3: stacking two electrode sheets (2) manufactured according to step 2 and the separator paper spaced between the two electrode sheets (2) so that the electrode ear region (22) of one electrode sheet (2) is exposed upward and the electrode ear region (22) of the other electrode sheet (2) is exposed downward, and then stacking and winding them in the same winding direction into a columnar structure so that the electrode ear regions (22) of the two electrode sheets (2) extend from both ends of the columnar structure respectively; Step 4: After the battery core is wound and formed, the A section will form a central injection area (12) on both end surfaces of the columnar structure, and a core rod hole (11) that runs axially through the central injection area is reserved at the center of the central injection area; after the battery core is wound and formed, the multiple cutting grooves (222) of the B section are overlapped with each other, and peripheral injection areas (13) are formed on both end surfaces of the columnar structure; after the battery core is wound and formed, the multiple pole ears (221) of the B section are overlapped with each other and flattened, and welding areas (14) are formed on both end surfaces of the columnar structure; after the battery core is wound and formed, the C section will form peripheral pole ear areas (15) on the periphery of both end surfaces of the columnar structure, and the pole ears (221) of the peripheral pole ear areas are also flattened together; Step 5: After the battery core is wound and formed, 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; Step 6: The middle liquid injection area (12) and the peripheral liquid injection area (13) are connected as one to facilitate rapid injection of electrolyte, and the welding area (14) and the peripheral tab area (15) are connected as one. After a current collector is arranged at the end of the battery coil core, the current collector is directly welded to the welding area (14).