All-tab battery and assembly method thereof

Abstract

The invention discloses a full-tab battery and an assembling method thereof, and the assembling method comprises the following steps: arranging a small tab on a metal foil material in a first area on the upper / lower side of a pole piece, and not arranging the small tab in a second area; winding the pole piece to form a battery roll core with a central hole, wherein the first region and the second region are arranged around the central hole at the end part of the battery roll core and are distributed along the radial direction at the end part of the battery roll core; the current collecting disc is placed on the second area; bending and stacking the small tabs on the current collecting plate along the radial direction of the battery roll core to form a tab layer; laser penetrates from the upper part of the tab layer to the lower part of the tab layer to the collector plate, so that the tab layer and the collector plate are fused and welded together. Compared with the prior art, after the collector plate is assembled, the collector plate is positioned between the battery roll core and the tab layer, and the tab is welded above the collector plate on the structure, so that welding metal chips cannot fall into the roll core, the possibility that a diaphragm is burnt through due to laser over-welding is eliminated, and the risk of short circuit is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a full-tab battery and an assembly method thereof. Background Art

[0002] At present, full-ear batteries are highly praised by the market for their advantages such as low internal resistance, low working heat, uniform current distribution of pole pieces, and higher roundness of winding core. Traditional pole-ear batteries use metal strips welded on the current collector as pole pieces to concentrate the current and lead it to the battery steel shell cover. The full-ear battery (also known as the pole-free battery) abandons the metal strip and leaves blanks on both sides of the current collector in the width direction as the path for leading the current. The winding core of the full-ear battery flattens the pole piece after flattening or die-cutting the pole piece to form a pole piece layer, and then welds the pole piece layer to the positive and negative current collector plates respectively, and finally welds the current collector plate to the shell or cover plate. The die-cutting method refers to cutting the blank foil on both sides of the current collector in the width direction into multiple quadrilateral single small pole pieces with a laser. After the pole piece is wound, all the single small pole pieces are stacked and flattened to form a pole piece layer parallel to the end face of the winding core, and then the current collector plate is covered on the pole piece layer, and the current collector plate and the pole piece layer are welded by laser.

[0003] refer to Figure 1 The conventional battery with tabs includes a battery steel shell 11, a battery core 12, a tab layer 13, a current collecting plate 14 and an 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 plate 14 is covered and welded on the tab layer 13, the end cover closes the opening of the battery steel shell 11, and a center hole 121 is provided in the middle of the battery core 12. However, since the tab layer 13 is formed by flattening the protruding tabs of the battery core after flattening or die-cutting, the tab layer is composed of multiple layers of thin single small tabs stacked together, and its thickness is very thin. When the current collecting plate 14 is welded on the tab layer 13, due to the limited laser accuracy, the thin single small tabs are easy to be over-welded, welded through, and the metal chips formed by welding through are easy to fall into the core, and after over-welding, the diaphragm may be burned through to form a short-circuit point, and the metal chips contaminate the winding and cause a short-circuit risk.

[0004] Therefore, there is an urgent need for a full-tab battery and an assembly method thereof that can solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a full-tab battery and an assembly method thereof, so that the distribution of the tabs on the pole piece matches the current collecting plate. After the current collecting plate is assembled, the current collecting plate is located between the battery winding core and the tab layer. On this structure, the tabs are welded above the current collecting plate, so that welding metal chips cannot fall into the winding core, and the possibility of laser over-welding causing the diaphragm to burn through is eliminated, thereby greatly reducing the risk of short circuit.

[0006] In order to achieve the above-mentioned object, the present invention provides a method for assembling a full-tab battery, comprising: step 1, providing a pole piece, wherein the upper side and / or the lower side of the pole piece has a first area and a second area along its edge, a small pole ear is protruding from the first area, and no small pole ear is provided in the second area; step 2, winding the pole piece to form a battery roll core having a central hole, and the first area and the second area are arranged around the central hole at the end of the battery roll core, and the first area and the second area are continuously distributed in the radial direction at the end of the battery roll core; step 3, providing a collection Step 4: bend the small pole tabs in the first area along the radial direction of the battery core and stack them on the current collecting disk in the second area to form a pole tab layer; Step 5: use a laser to penetrate from the outer side of the pole tab layer away from the current collecting disk to the inner side of the current collecting disk where the pole tab layer adheres to the current collecting disk and reaches the current collecting disk, so that the pole tab layer and the current collecting disk are melted and welded together to form an assembly; Step 6: install the assembly in a shell and electrically connect the current collecting disk to the battery terminal.

[0007] Preferably, in step 1, the upper side and / or lower side of the pole piece further includes a third region, the second region is located between the first region and the third region, and a small pole ear is convexly provided in the third region; in step 2, when the pole piece is wound into a battery roll core, the third region surrounds the central hole, and the third region and the end of the battery roll core in the second region are continuously distributed in the radial direction; in step 4, the small pole ear of the first region is bent along the radial direction of the battery roll core and stacked on the current collecting disk of the second region to form the first part of the pole ear layer, and the small pole ear of the third region is bent inwardly along the radial direction of the battery roll core and stacked on the current collecting disk of the second region to form the second part of the pole ear layer, and the pole ear layer includes the first part of the pole ear layer and the second part of the pole ear layer. Of course, the fourth region, the fifth region, etc. can also be provided on the pole piece, and it is only necessary to alternately arrange the region where the pole ear layer is provided and the region where the pole ear layer is not provided.

[0008] Specifically, in step 2, the pole piece is wound so that the first area forms a first annular area, the second area forms a second annular area, and the third area forms a third annular area, and the first annular area, the second annular area and the third annular area are sequentially distributed from the inside to the outside at the end of the battery roll core. Among them, the ring shape of the present invention is a circular ring shape, a square ring shape, etc. Of course, the ring shape is not limited to a standard shape, but can also be a special shape, as long as the second annular area is arranged in the radial direction of the position with a small pole ear.

[0009] Specifically, the first part of the pole lug layer and the second part of the pole lug layer are both annular, and there is an annular welding area between the two that does not cover the current collecting plate. In step 6, the electrical connector is welded to the welding area instead of the pole lug layer, and the current collecting plate is connected to the battery terminal through the electrical connector. The annular welding area is large enough to stably connect the battery terminal electrically. The electrical connector is not welded to the pole lug layer to prevent the pole lug layer from being damaged during subsequent welding of the electrical connector. The battery terminal can be formed on an end cover assembly or on a shell. The end cover assembly generally includes a cover plate that closes the shell opening, a pole column that is insulated and sealed and installed on the cover plate, and other structures. 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 connector can be a battery terminal directly, or it can be a current collector, an electrical connector, or other structures.

[0010] Specifically, the first region and the third region extend to the upper and / or lower edges of the pole piece, respectively. This solution enables the small pole tabs to be arranged near the inner and outer sides of the wound battery core.

[0011] Preferably, the tab layer partially covers the top of the current collecting disk, and the current collecting disk also has a welding area not covered by the tab layer. In step 6, the electrical connector is welded to the welding area instead of the tab layer, and the current collecting disk is connected to the battery terminal through the electrical connector. In step 6, the electrical connector is welded to the welding area instead of the tab layer, and the current collecting disk is connected to the battery terminal through the electrical connector. The battery terminal can be formed on the end cover assembly or on the shell. The end cover assembly generally includes a cover plate that closes the shell opening, a pole installed on the cover plate in an insulating and sealing manner, and other structures. 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 connector can be a battery terminal directly, or it can be a current collector, an electrical connector, or other structures.

[0012] Preferably, in step 2, the pole piece is wound so that the first area forms a first annular area, the second area forms a second annular area, the first annular area and the second annular area are sequentially distributed at the end of the battery winding core, and the first annular area is located within the second annular area or the first annular area is located outside the second annular area. When winding the pole piece, it can be wound from the side adjacent to the first area or from the side away from the first area, and it is only necessary to keep the area with small pole ears and the area without small pole ears continuously arranged in the radial direction to facilitate the bending and stacking of the small pole ears.

[0013] Specifically, in step 1, small pole ears are provided along the edges of the upper and lower sides of the pole piece, and the small pole ears include a first small pole ear and a second small pole ear formed on the upper and lower sides of the pole piece respectively and having opposite polarities; the current collecting disc has two and includes a first current collecting disc welded to the first small pole ear, and a second current collecting disc welded to the second small pole ear. Wherein, when the first small pole ear is a positive pole ear, the second small pole ear is a negative pole ear, the first current collecting disc is a positive current collecting disc, and the second current collecting disc is a negative current collecting disc, and vice versa.

[0014] The step 6 specifically includes: the current collecting disc also has a welding area not covered by the tab layer, welding the electrical connection piece to the welding area of ​​the first current collecting disc, installing the assembly in the shell with the second current collecting disc facing downward, welding the welding area of ​​the second current collecting disc to the bottom wall of the shell, sealingly covering the upper opening of the shell with the end cover assembly, and welding the electrical connection piece to the end cover assembly. Of course, the method of connecting the current collecting disc to the battery terminal is not limited to this, and other methods can be used to electrically connect the current collecting disc to the battery terminal.

[0015] Specifically, the first small pole tab is an aluminum foil pole tab, and the second small pole tab is a copper foil pole tab.

[0016] Preferably, the thickness of the current collecting plate is 0.1-0.5 mm, and the thickness of the small pole ear is 6-10 um.

[0017] The present invention also provides a full-tab battery, which is manufactured by the above-mentioned full-tab battery assembly method and includes a shell, a battery roll core installed in the shell, a current collecting disk and an end cover assembly, wherein the battery roll core has a center hole in the middle, and the end of the battery roll core has a first area with a small pole ear protruding and a second area without a small pole ear, the second area and the first area are continuously arranged radially at the end of the battery roll core, the small pole ear is protruding at the end of the battery roll core around the center hole of the battery roll core, the current collecting disk is installed on the second part and exposes the first area, the small pole ear is bent and stacked on the current collecting disk along the radial direction of the battery roll core to form a pole ear layer, and the pole ear layer and the collector are melt-welded together, and the end cover assembly is installed to close the opening of the shell and is electrically connected to the current collecting disk.

[0018] Preferably, the end of the battery roll core further has a third region with a small pole lug protruding thereon, the second region is away from the center hole relative to the first region, and the third region and the second region are continuously arranged in the radial direction at the end of the battery roll core, the small pole lug on the first region is bent radially outward and stacked on the current collecting disk of the second region to form the first part of the pole lug layer, the small pole lug on the third region is bent radially inward at the end of the battery roll core and stacked on the current collecting disk of the second region to form the second part of the pole lug layer, and the pole lug layer includes the first part of the pole lug layer and the second part of the pole lug layer. This solution allows the pole lug layer to be welded to the current collecting disk from both sides, so that the current collecting disk and the pole lug layer are firmly formed on the battery roll core after welding, and the connection stability is high.

[0019] More preferably, the first region, the second region and the third region are annular regions arranged around the central hole and distributed sequentially from the inside to the outside at the end of the battery roll core. Of course, in contrast to this, the first region, the second region and the third region may also be arc-shaped regions or other shapes that are not closed into an annular shape, not limited to an annular shape, and the electrical connector is welded to the welding area and not to the tab layer. The annular welding area is large enough to stably electrically connect the battery terminal, and the electrical connector is not welded to the tab layer to prevent the tab layer from being damaged during subsequent welding of the electrical connector. The battery terminal may be formed on an end cap assembly or on a shell. The end cap assembly generally includes a cover plate that closes the shell opening, a pole installed on the cover plate in an insulating and sealing manner, and other structures. The structure of the end cap assembly is well known to those skilled in the art and will not be described in detail herein. The electrical connector may be a battery terminal directly, or it may be a current collector, an electrical connector sheet, or other structures.

[0020] Specifically, the current collecting disk is annular, the first portion of the pole tab layer and the second portion of the pole tab layer are annular, and there is also an annular welding area between the first portion of the pole tab layer and the second portion of the pole tab layer that is not covered by the pole tab layer, the welding area is used to weld an electrical connector to electrically connect the battery terminal, the electrical connector is welded to the welding area and not to the pole tab layer. The connector is not welded to the pole tab layer to prevent the pole tab layer from being damaged during subsequent welding of the electrical connector.

[0021] Compared with the prior art, the present invention provides a new full-tab battery, including a new pole piece and tab distribution structure, a current collecting plate, and an assembly and welding method. The invention uses a special pole piece and tab distribution structure, and the geometric distribution position of the pole piece on the battery coil after winding matches the current collecting plate in the invention (the second area where the current collecting plate is located and the first area where the pole piece is located are distributed radially). After the battery coil and the current collecting plate are assembled, the pole piece layer is located above the current collecting plate, that is, the current collecting plate is between the coil body and the pole piece layer. Laser welding is performed on this structure to weld the pole piece above the current collecting plate, so that welding metal chips cannot fall into the coil, and the possibility of laser over-welding causing the diaphragm to burn through is eliminated, greatly reducing the risk of short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of a full-tab battery in the prior art.

[0023] Figure 2 It is a flow chart of a part of the full-tab battery assembly method of the present invention.

[0024] Figure 3 It is a flow chart of another part of the full-tab battery assembly method of the present invention.

[0025] Figure 4 yes Figure 2 Enlarged view of part a.

[0026] Figure 5 It is a partially enlarged view of the full-tab battery assembly method of the present invention.

[0027] Figure 6 It is a structural diagram of the full-tab battery of the present invention.

[0028] Figure 7 It is a structural diagram of the positive current collecting disk of the present invention.

[0029] Figure 8 It is a structural diagram of the negative current collecting plate of the present invention.

[0030] Fig. 9 It is a structural diagram of the invented battery coil core. DETAILED DESCRIPTION

[0031] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0032] refer to Figures 2 to 5 The present invention discloses a full-tab battery assembly method, comprising steps S1 to S6.

[0033] Step S1, reference Figure 2, providing a pole piece 22', wherein the first side of the pole piece 22' comprises a continuous first region 31' and a second region 32'. Figure 2 and Figure 4 The metal foil of the first region 31' is cut into small tabs (241a', 241b', 242a', 242b'), and the second region 32' has no small tabs. In this embodiment, the small tabs are formed by cutting, and of course, the formation method of the small tabs is not limited thereto.

[0034] In this embodiment, the first side of the pole piece 22 ′ is the upper side and the lower side of the pole piece 22 ′.

[0035] The better, reference Figure 2 and Figure 4 The first side further includes a third region 33', the second region 32' separates the first region 31' and the third region 33', and the metal foil of the third region 33' is cut into small tabs (242a', 242b').

[0036] Among them, reference Figure 2 , the first region 31' and the third region 33' extend to both end edges of the first side respectively. Of course, not limited thereto, one of the first region 31' and the third region 33' may also be located at the center of the pole piece.

[0037] The metal foil material protruding from the upper side of the pole piece 22' is aluminum foil, and the small pole ear (aluminum foil pole ear) cut out is the positive pole ear, and the metal foil material protruding from the lower side of the pole piece 22' is copper foil, and the small pole ear (copper foil pole ear) cut out is the negative pole ear. The small pole ear includes a positive pole ear 241a' located in the upper first area 31', a positive pole ear 242a' located in the upper third area 33', a negative pole ear 241b' located in the lower first area 31', and a negative pole ear 242a' located in the lower third area 33'.

[0038] Step S2, reference Figure 3 The pole piece 22' is wound to form a battery roll core 22 having a central hole 221, and the first side is formed at the end of the battery roll core 22, and the first region 31' and the second region 32' are wound into a first annular region 31 and a second annular region 32, which respectively surround the central hole 221 and are continuously arranged in the radial direction of the battery roll core 22.

[0039] When there is a third area 33', the third area 33' is surrounded as a third annular area 33, and the third annular area 33 surrounds the central hole 221. The first annular area 31, the second annular area 32 and the third annular area 33 surround the central hole 221 in sequence from the inside to the outside in the radial direction.

[0040] refer to Fig. 9 In step S2, the pole piece 22' is wound so that the first region 31' forms a first annular region 31, the second region 32' forms a second annular region 32, and the third region 33' forms a third annular region 33. The second annular region 32 and the third annular region 33 are continuously arranged in the radial direction of the battery roll core 22. Of course, the first annular region, the second annular region and the third annular region can also be replaced by unclosed arc regions or other shapes.

[0041] In which, after the electrode sheet 22' is wound in step S2, the positive electrode ear 241a' of the first region 31' forms a first annular positive electrode ear portion 241a', the positive electrode ear 242a' of the third region 33' forms a second annular positive electrode ear portion 242a', the negative electrode ear 241b' of the first region 31' forms a first annular negative electrode ear portion 241b', and the negative electrode ear 241b' of the third region 33' forms a second annular negative electrode ear portion 242b'. The positive electrode ears 241a' and 242a' are located on the upper end surface of the battery roll core 22, and the negative electrode ears 241b' and 242b' are located on the lower end surface of the battery roll core 22.

[0042] Step S3 and Figure 5 , provide a collecting plate, and place the collecting plate (positive collecting plate 23a, negative collecting plate 23b) on the second area 32'.

[0043] There are two current collecting plates, including a positive current collecting plate 23a welded to the positive electrode tabs 241a' and 242a', and a negative current collecting plate 23b welded to the negative electrode tabs 241b' and 242b'.

[0044] Step S4, reference Figure 3 and Figure 5 The small tabs are bent along the radial direction of the battery core 22 and stacked on the current collecting disks (positive current collecting disks 23a and negative current collecting disks 23b) to form tab layers (241a, 241b, 242a, 242b). The tab layers are divided into positive tab layers (241a, 242a) and negative tab layers (241b, 242b).

[0045] Specifically, the positive electrode ear 241a of the first positive electrode ear portion 241a" is bent radially outwardly of the battery roll core 22 and stacked on the positive current collecting disk 23a to form the first part 241a of the positive electrode ear layer, and the positive electrode ear 242a' of the second positive electrode ear portion 242a" is bent radially inwardly of the battery roll core 22 and stacked on the positive current collecting disk 23a to form the second part 242a of the positive electrode ear layer. The first negative electrode ear portion 241b" is bent radially outwardly of the battery roll core 22 and stacked on the negative current collecting disk 23b to form the first part 241b of the negative electrode ear layer, and the second negative electrode ear portion 242b" is bent radially inwardly of the battery roll core 22 and stacked on the negative current collecting disk 23b to form the second part 242b of the negative electrode ear layer.

[0046] Step S5, laser welding is performed from the outside of the pole lug layer (241a, 241b, 242a, 242b), and the laser penetrates from above the pole lug layer (241a, 241b, 242a, 242b) to below the pole lug layer (241a, 241b, 242a, 242b) to the current collecting plate (positive current collecting plate 23a, negative current collecting plate 23b), so that the pole lug layer (241a, 241b, 242a, 242b) and the current collecting plate (positive current collecting plate 23a, negative current collecting plate 23b) are melted and welded together to form an assembly.

[0047] refer to Figure 7 and Figure 8 The first part 241a of the positive electrode ear layer is melt-welded with the positive current collecting disk 23a to form a first annular weld 231a, and the second part 242a of the positive electrode ear layer is melt-welded with the positive current collecting disk 23a to form a second annular weld 233a. The first part 241b of the negative electrode ear layer is melt-welded with the negative current collecting disk 23b to form a first annular weld 231b, and the second part 242b of the negative electrode ear layer is melt-welded with the negative current collecting disk 23b to form a second annular weld 233b. The first annular welds 231a and 231b are located inside the second annular welds 233a and 233b and do not overlap with the second annular welds 233a and 233b. Specifically, an annular spacing area 232a, 232b is provided between the first annular welding portion 231a, 231b and the second annular welding portion 233a, 233b, and a welding area is formed on the annular spacing area 232a, 232b, and the welding area is used to weld electrical connectors to connect battery terminals.

[0048] Step S6, installing the assembly in the housing 21, and electrically connecting the current collecting plates (positive current collecting plate 23a, negative current collecting plate 23b) to the battery terminals.

[0049] Step 6 is specifically as follows: welding the electrical connection piece 25 to the area (annular spacing area 232a) on the positive collector disk that does not cover the tab layer, the electrical connection piece 25 is not welded to the tab layer, the assembly formed by welding the battery core 22 and the collector disk (positive collector disk 23a, negative collector disk 23b) together is installed in the shell 21, and the negative collector disk 23b faces downward, the area (annular spacing area 232b) on the negative collector disk 23b that does not cover the tab layer is welded to the bottom wall of the shell 21, the bottom wall of the shell 21 is not welded to the tab layer, the end cover assembly is sealed to cover the upper opening of the shell 21, and the electrical connection piece 25 is welded to the end cover assembly. Of course, the method of connecting the collector disk to the battery terminal is not limited to this, and other methods can be used to electrically connect the collector disk to the battery terminal. Among them, the electrical connector can be an electrical connection piece, an end cover assembly, an electrical connection piece 25, etc.

[0050] Wherein, the thickness of the current collecting plate is 0.1-0.5 mm, and the thickness of the tab of the tab layer is 6-10 um.

[0051] refer to Figure 6 The present invention also provides a full-tab battery, which is made by the above-mentioned full-tab battery assembly method. The full-tab battery includes a shell 32, a battery core 22 installed in the shell 32, and a current collecting plate (positive current collecting plate 23a, negative current collecting plate 23b), the battery core 22 is cylindrical and has a center hole 221 in the middle, and the end of the battery core 22 has a first annular area 31 with protruding small tabs (positive tab 241a' and negative tab 241b') and a second annular area 32 without small tabs, the second annular area 32 is continuously arranged with the first annular area 31 in the radial direction, and the small tabs surround the battery. The center hole 221 of the battery core 22 is protruding at the end of the battery core 22, and the current collecting disk (positive current collecting disk 23a, negative current collecting disk 23b) covers the second annular area 32 and exposes the first annular area 31. The small pole ears of the first annular area 31 are bent and stacked on the current collecting disk (positive current collecting disk 23a, negative current collecting disk 23b) along the radial direction of the battery core 2 to form a pole ear layer, and the pole ear layer is melted and welded with a partial area of ​​the current collecting disk (positive current collecting disk 23a, negative current collecting disk 23b).

[0052] refer to Figure 6 and Fig. 9The end of the battery roll core 22 also has a third annular area 33 with a small pole ear protruding thereon. The second annular area 32 is away from the central hole 221 relative to the first annular area 31. The third annular area 33 is located on the side of the second annular area 32 away from the first area 31'. The third annular area 33 is radially continuous with the second annular area 32. The small pole ears (positive pole ear 241a', negative pole ear 241b') on the first annular area 31 are bent radially outward and stacked on the current collecting plate ( A first portion of the pole lug layer (a first portion of the positive pole lug layer 241a, a first portion of the negative pole lug layer 241b) is formed on the positive current collecting disk 23a, a negative current collecting disk 23b), and the small pole lugs (a positive pole lug 242a', a negative pole lug 242b') on the third annular area 33 are bent radially inward and stacked on the current collecting disks (a positive current collecting disk 23a, a negative current collecting disk 23b) to form a second portion of the pole lug layer (a second portion of the positive pole lug layer 242a, a second portion of the negative pole lug layer 242b), and the pole lug layer includes a first portion of the pole lug layer and a second portion of the pole lug layer.

[0053] Specifically, the small tabs include positive tabs 241a', 242a' and negative tabs 241b', 242b'. The first tab layer includes the first positive tab layer 241a and the first negative tab layer 241b, and the second tab layer includes the second positive tab layer 242a and the second negative tab layer 242b.

[0054] refer to Figure 7 and Figure 8 The first part 241a of the positive electrode ear layer is melt-welded with the positive current collecting disk 23a to form a first annular weld 231a, and the second part 242a of the positive electrode ear layer is melt-welded with the positive current collecting disk 23a to form a second annular weld 233a. The first part 241b of the negative electrode ear layer is melt-welded with the negative current collecting disk 23b to form a first annular weld 231b, and the second part 242b of the negative electrode ear layer is melt-welded with the negative current collecting disk 23b to form a second annular weld 233b. The first annular welds 231a and 231b are located inside the second annular welds 233a and 233b and do not overlap with the second annular welds 233a and 233b. Specifically, an annular spacing area 232a, 232b is provided between the first annular welding portion 231a, 231b and the second annular welding portion 233a, 233b, and a welding area is formed on the annular spacing area 232a, 232b, and the welding area is used to weld electrical connectors to connect battery terminals, and the electrical connectors are not welded to the tab layer.

[0055] In this embodiment, after the pole piece 22' is wound, the first part 241a, 241b of the pole tab layer and the second part 242a, 242b of the pole tab layer are both annular parts, and the second part 242a, 242b of the pole tab layer and the first part 241a, 241b of the pole tab layer sequentially surround the central hole 221 and form an annular welding area (annular spacing area 232a, 232b) between each other. In this embodiment, the current collecting disk (positive current collecting disk 23a, negative current collecting disk 23b) is annular and only covers the second area 32'.

[0056] Of course, different from this, the first annular area 31, the second annular area 32 and the third annular area 33 can also be replaced by an unclosed arc structure or other special-shaped structures, and the first part 241a, 241b of the pole lug layer and the second part 242a, 242b of the pole lug layer can also be an unclosed arc area. At this time, the first part 241a, 241b of the pole lug layer and the second part 242a, 242b of the pole lug layer can overlap partially or completely in the radial direction, or they can be completely staggered.

[0057] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A method for assembling a full-tab battery, characterized in that: include: Step 1, providing a pole piece, wherein the upper side and / or the lower side of the pole piece has a first area and a second area along its edge, a small pole ear is protruding from the first area, and no small pole ear is provided in the second area; Step 2, winding the electrode sheet to form a battery roll core having a central hole, and the first region and the second region are arranged around the central hole at the end of the battery roll core, and the first region and the second region are continuously distributed in the radial direction at the end of the battery roll core; Step 3, providing a current collecting plate, and placing the current collecting plate on the second area of ​​the end of the battery coil core; Step 4, bending the small tabs in the first region along the radial direction of the battery coil core and stacking them on the current collecting disk in the second region to form a tab layer; Step 5, using a laser to penetrate from the outer side of the tab layer away from the current collecting plate to the inner side of the tab layer attached to the current collecting plate and reach the current collecting plate, so that the tab layer and the current collecting plate are melt-welded together to form an assembly; Step 6: Install the assembly in a housing and electrically connect the current collecting plate to the battery terminals.

2. The method for assembling a full-tab battery according to claim 1, characterized in that: In step 1, the upper side and / or the lower side of the pole piece further includes a third area, the second area is located between the first area and the third area, and a small pole ear is protruded from the third area; In step 2, when the electrode sheet is wound into a battery roll core, the third region surrounds the central hole, and the third region and the end of the battery roll core in the second region are continuously distributed in the radial direction; In step 4, the small pole tabs of the first region are bent radially along the battery roll core and stacked on the current collecting disk of the second region to form a first part of the pole tab layer, and the small pole tabs of the third region are bent radially inwardly along the battery roll core and stacked on the current collecting disk of the second region to form a second part of the pole tab layer. The pole tab layer includes the first part of the pole tab layer and the second part of the pole tab layer.

3. The method for assembling a full-tab battery according to claim 2, characterized in that: Step 2: Winding the electrode sheet so that the first area forms a first annular area, the second area forms a second annular area, and the third area forms a third annular area. The first annular area, the second annular area and the third annular area are distributed in sequence from the inside to the outside at the end of the battery roll core.

4. The method for assembling a full-tab battery according to claim 2, wherein: The first portion of the pole lug layer and the second portion of the pole lug layer are both annular, and there is an annular welding area between the two that does not cover the current collecting disk. In step 6, the electrical connector is welded to the welding area instead of to the pole lug layer, and the current collecting disk is connected to the battery terminal through the electrical connector.

5. The method for assembling a full-tab battery according to claim 2, wherein: The first region and the third region extend to both end edges of the upper side and / or the lower side of the pole piece respectively.

6. The method for assembling a full-tab battery according to claim 1, wherein: The tab layer partially covers the top of the current collecting plate, and the current collecting plate also has a welding area not covered by the tab layer. In step 6, the electrical connector is welded to the welding area instead of the tab layer, and the current collecting plate is connected to the battery terminal through the electrical connector.

7. The method for assembling a full-tab battery according to claim 1, wherein: Step 2, winding the electrode sheet so that the first area forms a first annular area, and the second area forms a second annular area, the first annular area and the second annular area are distributed in sequence at the end of the battery roll core, and the first annular area is located within the second annular area or the first annular area is located outside the second annular area.

8. The method for assembling a full-tab battery according to claim 1, wherein: In step 1, small pole ears are arranged along the edges of the upper and lower sides of the pole piece, and the small pole ears include a first small pole ear and a second small pole ear respectively formed on the upper and lower sides of the pole piece and having opposite polarities; the current collecting plate has two and includes a first current collecting plate welded to the first small pole ear, and a second current collecting plate welded to the second small pole ear.

9. The method for assembling a full-tab battery according to claim 8, characterized in that: The step 6 specifically includes: the current collecting disc also has a welding area not covered by the tab layer, welding the electrical connecting piece to the welding area of ​​the first current collecting disc, installing the assembly in the shell with the second current collecting disc facing downward, welding the welding area of ​​the second current collecting disc to the bottom wall of the shell, sealingly covering the upper opening of the shell with an end cover assembly, and welding the electrical connecting piece to the end cover assembly.

10. The method for assembling a full-tab battery according to claim 1, wherein: The thickness of the current collecting plate is 0.1-0.5 mm, and the thickness of the small pole ear is 6-10 um.

11. The method for assembling a full-tab battery according to claim 1, wherein: In step 1, the small pole ear is cut from the metal foil protruding from the pole piece.

12. A full-tab battery, characterized in that: A full-tab battery assembly method according to any one of claims 1 to 11, comprising a shell, a battery core installed in the shell, a current collecting disk and an end cover assembly, wherein the battery core has a center hole in the middle, and the end of the battery core has a first area with a small tab protruding and a second area without a small tab, the second area and the first area are radially continuous at the end of the battery core, the small tab is protruding at the end of the battery core around the center hole of the battery core, the current collecting disk is installed on the second part and the first area is exposed, the small tab is bent and stacked on the current collecting disk along the radial direction of the battery core to form a tab layer, and the tab layer is melt-welded to the collector, and the end cover assembly is installed to close the opening of the shell and is electrically connected to the current collecting disk.

13. The full-tab battery according to claim 12, characterized in that: The end of the battery roll core also has a third area with a small pole ear protruding therefrom, the second area is far away from the center hole relative to the first area, and the third area and the second area are radially continuously arranged at the end of the battery roll core, the small pole ears on the first area are bent radially outward and stacked on the collecting disk of the second area to form a first part of the pole ear layer, and the small pole ears on the third area are bent radially inward at the end of the battery roll core and stacked on the collecting disk of the second area to form a second part of the pole ear layer, and the pole ear layer includes the first part of the pole ear layer and the second part of the pole ear layer.

14. The full-tab battery according to claim 13, characterized in that: The first area, the second area and the third area are annular areas arranged around the central hole and distributed sequentially from the inside to the outside at the end of the battery roll core.

15. The full-tab battery according to claim 14, characterized in that: The current collecting plate is annular, the first part of the pole lug layer and the second part of the pole lug layer are annular, and there is also an annular welding area between the first part of the pole lug layer and the second part of the pole lug layer that is not covered by the pole lug layer, and the welding area is used to weld electrical connectors to electrically connect battery terminals, and the electrical connectors are welded to the welding area but not to the pole lug layer.

16. The full-tab battery according to claim 13, characterized in that: The current collecting disk has a welding area not covered by the tab layer, the welding area is used for welding an electrical connector to electrically connect the battery terminals, and the electrical connector is welded to the welding area but not to the tab layer.

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