Full-tab battery structure and cylindrical battery
By placing the current collector between the core and the tab layer in the full tab battery structure, and bending and welding the tab onto the current collector, the problem of welding metal shavings entering the core is solved, the risk of short circuit is reduced, and the welding stability and electrical connection reliability are improved.
Patent Information
- Application Number
- CN202422981324.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2034-12-03
AI Technical Summary
During the welding process of traditional all-tab batteries, metal shavings can easily fall into the core, leading to a short circuit risk. Furthermore, laser over-welding may burn through the separator, creating a short circuit point.
The collector plate is placed between the core section and the tab layer, and the tab is bent and pressure welded to the collector plate to prevent welding metal shavings from entering the core and eliminate the risk of diaphragm burn-through caused by laser over-welding.
It effectively prevents welding metal shavings from entering the core, reduces the risk of short circuits, and improves welding stability and electrical connection reliability.
Smart Images
Figure CN223871461U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to new energy field especially relates to the full tab structure of battery. BACKGROUND
[0002] At present, full tab battery is praised by the market for the advantages of low finished product internal resistance, small working heat generation, uniform current distribution of pole piece, higher core roundness etc. Figure 1 The traditional tab battery includes battery steel shell 11, battery core 12, tab layer 13, current collecting disc 14 and end cover, the battery core 12 is installed in the battery steel shell 11, the tab layer 13 is formed at the end of the battery core 12, the current collecting disc 14 is covered and welded on the tab layer 13, the end cover closes the opening of the battery steel shell 11, and the middle of the battery core 12 is provided with a center hole 121.However, since the tab layer 13 is formed by rubbing or die cutting the protruding tab of the battery core and then flattening, the tab layer is composed of multiple layers of thin single small tabs stacked together, and the thickness is very thin, when the current collecting disc 14 is welded on the tab layer 13, due to the limited laser precision, the thin single small tab is easy to overweld, weld through and form metal chips that are easy to fall into the core, and after overwelding, it is possible to burn through the diaphragm to form a short circuit point, and the metal chips pollute the winding to cause short circuit risk.
[0003] Therefore, there is an urgent need for a full tab battery structure and a cylindrical battery that can solve the above problems. CONTENT
[0004] The utility model aims at providing a full tab battery structure and a cylindrical battery, which sets the current collecting disc between the core cross section and the tab layer, so that the welding metal chips cannot fall into the core during assembly and welding, and the possibility of laser overwelding causing the diaphragm to burn through is eliminated, greatly reducing the risk of short circuit.
[0005] In order to achieve the above purpose, the utility model provides a full tab battery structure, which comprises a battery core with a center hole, a tab layer and a current collecting disc, the end of the battery core has a first area with protruding small tabs and a second area without protruding small tabs, the first area and the second area are continuously arranged at the end of the battery core, the current collecting disc is installed and carried on the second area of the battery core and exposes the first area, and the small tabs are bent towards the current collecting disc and pressure welded on the current collecting disc to form the tab layer.
[0006] Preferably, the small tabs are pressure welded and cover part of the area of the current collecting disc, so that part of the area of the current collecting disc is exposed outside the tab layer to form a welding area, and the welding area is used for welding an electrical connecting piece to electrically connect the battery terminal.
[0007] Preferably, the tab layer comprises a first tab layer portion, the first region is a first annular region, the second region is a second annular region, the first annular region and the second annular region are sequentially arranged along the radial direction of the battery roll core on the end surface of the battery roll core, the first tab layer portion is bent and pressed from the first annular region to the second annular region on the current collector of the battery roll core and is welded with the current collector.
[0008] More preferably, the full-tab battery structure further comprises a third annular region provided with protruding small tabs, the first annular region, the second annular region and the third annular region sequentially extend along the radial direction from the center outward on the end surface of the battery roll core, the tab layer further comprises a second tab layer portion protruding from the third annular region, the first tab layer portion is bent and pressed from the first annular region to the current collector of the second annular region, and the second tab layer portion is bent and pressed from the third annular region to the current collector of the second annular region. The tab layer is bent and pressed from both sides to the current collector, so that the connection between the current collector and the tab layer is stable, and the current collector is not easy to shake.
[0009] Specifically, the first tab layer portion is welded with the current collector to form a first annular welding portion, the second tab layer portion is welded with the current collector to form a second annular welding portion, the first annular welding portion is located inside the second annular welding portion and has an annular spacing area between the second annular welding portion, the annular spacing area is provided with a welding area welded with an electrical connector, and the welding area is welded with the electrical connector to electrically connect the battery terminal. The annular welding area makes the connection between the current collector and the electrical connector stable. The electrical connector is welded with the tab layer portion.
[0010] Preferably, the tab layer is formed by bending and stacking a plurality of small tabs protruding from the roll core, the small tabs are metal foils cut from the edge of the tab, so that the small tabs are integrally formed with the battery roll core.
[0011] Preferably, the tab layer is formed on the first end surface and the second end surface of the battery roll core, the tab layer of the first end surface is a positive tab layer, the tab layer of the second end surface is a negative tab layer, and the current collector has two current collectors, i.e., a positive current collector mounted on the first end surface and a negative current collector mounted on the second end surface.
[0012] Preferably, the positive tab layer is an aluminum foil tab layer, and the negative tab layer is a copper foil tab layer.
[0013] Preferably, the thickness of the current collector is 0.1-0.5mm, and the thickness of the tab of the tab layer is 6-10um.
[0014] Preferably, the small tabs are bent along the radial direction of the end portion of the battery roll core and are welded on the current collecting plates to form the tab layer.
[0015] The utility model further provides a cylindrical battery, including casing, end cover subassembly and full tab battery structure as described above, the battery roll core is installed in the casing, the end cover subassembly seals the opening of casing.
[0016] Preferably, the tab layer is formed on the first end face and the second end face of the battery roll core, the tab layer of the first end face is a positive tab layer, the tab layer of the second end face is a negative tab layer, the current collecting plate has two and is a positive current collecting plate installed on the first end face and a negative current collecting plate installed on the second end face respectively, the positive current collecting plate is electrically connected with the end cover subassembly through the current collecting sheet, and the negative current collecting plate is electrically connected with the bottom of the casing.
[0017] Compared with the prior art, the utility model discloses that the current collecting plate is arranged in the annular shape and covers the partial area of the end portion of the battery roll core, then the tab is protruded on another partial area of the end portion of the battery roll core, so that the tab is bent and pressed on the current collecting plate and then laser welded, so that the welding metal scrap cannot fall into the roll core, and the possibility of burning through the diaphragm caused by laser overwelding is eliminated, and the short circuit risk is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is the structure diagram of the prior art tab battery.
[0019] Figure 2 It is the structure diagram of the cylindrical battery of the utility model.
[0020] Figure 3 It is the structure diagram of the positive current collecting plate of the utility model.
[0021] Figure 4 It is the structure diagram of the negative current collecting plate of the utility model.
[0022] Figure 5 It is the structure diagram of the battery roll core of the utility model. DETAILED DESCRIPTION
[0023] To make the technical content, structural features, achieved purposes and effects of the utility model more clear, the following will be described in detail in combination with the embodiments and the drawings.
[0024] REFERENCE Figure 2The utility model discloses a cylindrical battery, including shell 21, end cover subassembly and the battery roll core 22 of having center hole 221, the pole ear layer 24a, 24b and the current collector disc 23a, 23b, the battery roll core 22 is installed in the shell 21, the current collector disc 23a, 23b connects the pole ear layer 24a, 24b electricity to the battery terminal, the end cover subassembly seals the opening of shell 21.
[0025] Reference Figure 2 And Figure 5 The battery roll core 22, the pole ear layer (the positive pole ear layer 24a, the negative pole ear layer 24b) and the current collector disc (the positive current collector disc 23a, the negative current collector disc 24a) constitute full pole ear battery structure. The end of the battery roll core 22 has the first area of the convex small pole ear and the second area of not the convex small pole ear, the first area and the second area are connected together, the current collector disc (the positive current collector disc 23a, the negative current collector disc 24a) is installed and is borne on the second area of the battery roll core 22 and exposes the first area, the small pole ear is bent to the current collector disc (the positive current collector disc 23a, the negative current collector disc 24a) and is press-welded on the current collector disc 23a to form the pole ear layer (the positive pole ear layer 24a, the negative pole ear layer 24b).
[0026] Wherein, the pole ear layer (the positive pole ear layer 24a, the negative pole ear layer 24b) is formed on the first end face and the second end face of the battery roll core 22, and the pole ear layer of the first end face is the positive pole ear layer 24a, the pole ear layer of the second end face is the negative pole ear layer 24b, and the current collector disc has two and is the positive current collector disc 23a installed on the first end face and the negative current collector disc 23b installed on the second end face. The positive current collector disc 23a is electrically connected with the positive pole post on the end cover subassembly through the current collecting sheet 25, and the negative current collector disc 23b is electrically connected with the bottom of the shell 21. Wherein, the pole ear layer is bent and stacked by a plurality of small pole ears protruding on the battery roll core 22. The small pole ear is cut from the edge of the pole piece.
[0027] Wherein, the positive pole ear layer 24a is the aluminum foil pole ear layer, and the negative pole ear layer 24b is the copper foil pole ear layer 24b. In the embodiment, the thickness of the positive current collector disc 23a and the negative current collector disc 24a is 0.1-0.5mm, and the thickness of the small pole ear of the positive pole ear layer 24a and the negative pole ear layer 24b is 6-10um. The current collector disc is much thicker than the pole ear layer.
[0028] Reference Figure 2The positive tab layer 24a includes a tab layer first part 241a, and the negative tab layer 24b includes a tab layer first part 241b. The first area is the first annular area 31, and the second area is the second annular area 32. The battery roll core 22 has, on the end face, a first annular area 31 and a second annular area 32 in sequence from the center outward. The positive current collector 23a and the negative current collector 23b are annular and are located above the second annular area 32 of the corresponding end face of the battery roll core 22. The tab layer first part 241a, 241b is bent and pressed from the first annular area 31 of the corresponding end face of the battery roll core 22 to above the current collector 23a, 23b, so that the positive current collector 23a and the negative current collector 23b are annular and are installed on the corresponding end face of the battery roll core 22. The tab layer first part 241a is bent and pressed from the first end face of the battery roll core 22 to the positive current collector 23a and is welded with the positive current collector 23a. The tab layer first part 241b is bent and pressed from the second end face of the battery roll core 22 to the negative current collector 23b and is welded with the negative current collector 23b. Of course, the positive current collector 23a and the negative current collector 23b can also be located above the first annular area 31 of the first end face and the second end face of the battery roll core 22. At this time, the tab layer first part 241a, 241b is protruded upward from the second annular area 32 of the first end face and the second end face of the battery roll core 22 and is bent and pressed above the positive current collector 23a and the negative current collector 23b.
[0029] Of course, the first area can also be an arc-shaped area or an area of other shapes, and the second area can be an arc-shaped area or an area of other shapes. The small tabs are protruded from the first area and are bent and stacked on the second area, so as to be stacked on the current collector and welded and assembled together. The first area and the second area can be arranged along the radial direction or other directions, and the radial arrangement is preferred, so that the small tabs are bent and stacked on the current collector along the radial direction.
[0030] In this embodiment, the current collector is an annular disc, specifically a circular ring. Of course, the current collector can also be of other shapes, and can have a hollow structure avoiding the area where the small tabs are located.
[0031] Continuing to refer to Figure 2 and Figure 5The full-tab battery structure further comprises a third annular area 33 outside the second annular area 32, and the tab layer further comprises a tab layer second part 242a of the positive tab layer and a tab layer second part 242b of the negative tab layer, the tab layer first part 241a, 241b being radially (radially of the end face of the battery core 22) outwardly bent and press-welded on the positive current collector 23a and the negative current collector 23b of the second annular area 32 by the first annular area 31 of the first end face and the second end face of the battery core 22, and the tab layer second part 242a, 242b being radially inwardly bent and press-welded on the positive current collector 23a and the negative current collector 23b of the second annular area 32 by the third annular area 33 of the first end face and the second end face of the battery core 22.
[0032] Reference Figure 3 And Figure 4 The tab layer first part 241a and the positive current collector 23a are welded together to form a first annular welding part 231a, and the tab layer second part 231a and the positive current collector 23a are welded together to form a second annular welding part 233a. The tab layer first part 241b and the negative current collector 23b are welded together to form a first annular welding part 231b, and the tab layer second part 231b and the negative current collector 23b are welded together to form a second annular welding part 233b. The first annular welding part 231a, 231b is located inside the second annular welding part 233a, 233b and does not overlap with the second annular welding part 233a, 233b. Specifically, the first annular welding part 231a, 231b and the second annular welding part 233a, 233b have an annular spacing area 232a, 232b, and the annular spacing area 232a, 232b is provided with a welding area for welding an electrical connecting member, and the welding area is welded with the electrical connecting member to electrically connect the battery terminal. Wherein, the battery terminal can be formed on the end cover assembly or the shell, and the end cover assembly generally comprises a cover plate for closing the opening of the shell, a pole for insulating and sealingly mounting on the cover plate, and the like structure, and the structure of the end cover assembly is well known to those skilled in the art and will not be described in detail here. The electrical connecting member can be directly the battery terminal, or can be a current collector, a current collecting sheet 25 or the like structure.
[0033] The welding area of the end cover assembly welded on the shell 21.
[0034] The above only discloses preferred embodiments of the present application, and of course cannot limit the scope of the present application, and therefore equivalent changes made within the scope of the patent application of the present application still fall within the scope of the present application.
Claims
1. A full-tab battery structure, comprising a battery core with a central hole, a tab layer, and a current collector, characterized in that: The end of the battery core has a first region with protruding small tabs and a second region without protruding small tabs. The first region and the second region are continuously arranged at the end of the battery core. The current collector is mounted and supported on the second region of the battery core and exposes the first region. The small tabs are bent toward the current collector and pressure welded to the current collector to form a tab layer.
2. The all-tab battery structure as described in claim 1, characterized in that: The small tabs are pressure welded and cover a portion of the current collector, exposing a portion of the current collector outside the tab layer to form a welding area. The welding area is used to weld electrical connectors to electrically connect to the battery terminals.
3. The all-tab battery structure as described in claim 1, characterized in that: The tab layer includes a first part of the tab layer, the first region being a first annular region and the second region being a second annular region. The first annular region and the second annular region are arranged sequentially along the radial direction of the battery core on the end face of the battery core. The first part of the tab layer is bent and pressed onto the current collector plate of the second annular region at the end of the battery core, so that the first part of the tab layer is welded to the current collector plate.
4. The all-tab battery structure as described in claim 3, characterized in that: It also includes a third annular region with protruding small tabs. The first annular region, the second annular region and the third annular region extend radially outward from the center on the end face of the battery core. The tab layer also includes a second part of the tab layer protruding from the third annular region. The first part of the tab layer is bent radially outward from the first annular region and pressed onto the current collector of the second annular region. The second part of the tab layer is bent inward from the third annular region and pressed onto the current collector of the second annular region.
5. The all-tab battery structure as described in claim 4, characterized in that: The first part of the tab layer is welded to the current collector to form a first annular welded portion, and the second part of the tab layer is welded to the current collector to form a second annular welded portion. The first annular welded portion is located inside the second annular welded portion and has an annular gap area between it and the second annular welded portion. A welding area for welding electrical connectors is formed on the annular gap area, and electrical connectors are welded to the welding area to electrically connect to the battery terminals.
6. The all-tab battery structure as described in claim 1, characterized in that: The tab layer is formed by bending and stacking several small tabs protruding from the core, and the small tabs are metal foil sheets cut from the edge of the electrode sheet.
7. The all-tab battery structure as described in claim 1, characterized in that: The tab layer is formed on the first end face and the second end face of the battery core, and the tab layer on the first end face is a positive tab layer, the tab layer on the second end face is a negative tab layer, and there are two current collectors, which are respectively a positive current collector installed on the first end face and a negative current collector installed on the second end face.
8. The all-tab battery structure as described in claim 7, characterized in that: The positive electrode tab layer is an aluminum foil tab layer, and the negative electrode tab layer is a copper foil tab layer.
9. The all-tab battery structure as described in claim 1, characterized in that: The thickness of the current collector is 0.1-0.5 mm, and the thickness of the small tabs forming the tab layer is 6-10 μm.
10. The all-tab battery structure as described in claim 1, characterized in that: The small tab is bent radially toward the current collector along the end of the battery core and pressure welded to the current collector to form the tab layer.
11. A cylindrical battery, characterized in that: The battery includes a housing, an end cap assembly, and a full-tab battery structure as described in any one of claims 1-10, wherein the battery core is mounted in the housing, and the end cap assembly seals the opening of the housing.
12. The cylindrical battery as described in claim 11, characterized in that: The tab layer is formed on the first end face and the second end face of the battery core, and the tab layer on the first end face is a positive tab layer, and the tab layer on the second end face is a negative tab layer. There are two current collectors, a positive current collector installed on the first end face and a negative current collector installed on the second end face. The positive current collector is electrically connected to the end cover assembly through a current collector plate, and the negative current collector is electrically connected to the bottom of the housing.