Battery structure with positive electrode and negative electrode on same side

Abstract

The utility model discloses a battery structure with a positive electrode and a negative electrode on the same side, which comprises a shell, a roll core, a combined collector plate, a combined cover plate and the like, a positive electrode lug and a negative electrode lug which are arranged on the same side are arranged at one end of the roll core, a positive electrode collector piece and a negative electrode collector piece which are insulated from each other are arranged on the combined collector plate, and a positive electrode collector column and a negative electrode collector column which are insulated from each other are arranged on the combined cover plate; therefore, only the combined current collecting disc needs to be installed at one end of the roll core provided with the positive pole lug and the negative pole lug, the combined cover plate is installed on the combined current collecting disc, the positive pole lug, the positive pole current collecting piece and the positive pole current collecting column are sequentially welded and conducted to lead out positive current, and the negative pole lug, the negative pole current collecting piece and the negative pole current collecting column are sequentially welded and conducted to lead out negative current. And then the roll core and the combined collector plate are arranged in the shell from the port of the shell and are covered and sealed by the combined cover plate to finish the assembly, so that the battery has the use advantages of simple structure and convenience in assembly, and the automatic production and manufacturing of the battery are greatly facilitated by combining with a corresponding manufacturing method.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically a battery structure with positive and negative electrodes on the same side. Background Technology

[0002] Existing batteries with positive and negative electrodes on the same side mainly refer to batteries where the positive and negative electrodes are set on the same end of the core, forming a same-side configuration. However, when components such as the core, current collector, and cover are sequentially installed into the casing, the positive electrode of the core is welded to the positive current collector at one end of the casing to conduct electricity and draw out the positive current. The negative electrode of the core, however, is still welded to the casing, drawing out the negative current at the other end. Therefore, in practical use, the manufactured battery still requires separate positive and negative current drawouts from both ends of the casing, and it is impossible to draw out positive and negative currents simultaneously from the same end of the casing. This imposes certain limitations on its use in certain special applications. Furthermore, existing battery structures have numerous components, in addition to… In addition to the necessary core, current collector, and cover plate, positive and negative current collectors and multiple insulating components for spacing and preventing internal short circuits are also required. The positive and negative current collectors and various insulating components need to be installed separately, which complicates the battery structure and makes the battery assembly process more troublesome, thus hindering automated battery production. Furthermore, the positive current collector is usually welded to the positive current collector post, and the negative current collector is usually welded to the casing to form conductivity. However, the direct welding between these two is a hard connection. Therefore, when the battery is under vibration, the weld point is prone to detachment, which greatly affects the reliability of the battery. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a battery structure with simple structure, convenient assembly, reliable use and easy automated production and manufacturing, in which the positive and negative electrodes are on the same side.

[0004] The technical problem of this utility model is solved by the following technical solution:

[0005] A battery structure with positive and negative electrodes on the same side includes a casing, a core, a combined current collector, and a combined cover plate. One end of the core has a positive electrode tab and a negative electrode tab arranged on the same side. The combined current collector has a positive current collector plate and a negative current collector plate, which are insulated from each other. The combined cover plate has a positive current collector post and a negative current collector post, which are insulated from each other. The combined current collector is installed at one end of the core with the positive and negative electrode tabs, and the combined cover plate is installed on the combined current collector. Both the core and the combined current collector are inserted into the casing through a port, and the combined cover plate seals the port. The positive electrode tab, positive current collector plate, and positive current collector post are sequentially electrically connected and lead out the positive current. The negative electrode tab, negative current collector plate, and negative current collector post are sequentially electrically connected and lead out the negative current.

[0006] The combined current collector includes a disc-shaped body with an inlet hole and two mounting slots symmetrically arranged around the core shaft. The positive current collector and the negative current collector are respectively positioned and installed in the two mounting slots.

[0007] The positive current collector includes a positive electrode body positioned and installed in one of the mounting slots, and a positive electrode section with one end connected to the positive electrode body and the other end suspended and extending on the disk; the negative current collector includes a negative electrode body positioned and installed in another mounting slot, and a negative electrode section with one end connected to the negative electrode body and the other end suspended and extending on the disk.

[0008] Both the positive and negative electrode sections are arc-shaped sections, and the positive and negative electrode sections are circularly enclosed with the core axis as the center, and the positive and negative electrode sections do not make contact with each other.

[0009] The positive electrode body is provided with a positive electrode elastic sheet formed by cutting grooves, and one end of the positive electrode segment is fixed to the positive electrode elastic sheet to form an elastic connection; the negative electrode body is provided with a negative electrode elastic sheet formed by cutting grooves, and one end of the negative electrode segment is fixed to the negative electrode elastic sheet to form an elastic connection.

[0010] The combined cover plate includes a circular cover body with an injection hole, a positive current collector, a negative current collector, and an explosion-proof valve; the injection hole is equipped with an openable and closable cap.

[0011] The inner surface of the cover is provided with a positive electrode connecting piece that is conductively connected to the positive electrode current collector and a negative electrode connecting piece that is conductively connected to the negative electrode current collector. The combined cover is installed on the combined current collector plate. The positive electrode connecting piece is conductively connected to the positive electrode current collector, and the negative electrode connecting piece is conductively connected to the negative electrode current collector.

[0012] One end of the positive electrode connecting piece is provided with a positive electrode connecting hole for fitting and connecting the positive electrode current collector, and the other end of the positive electrode connecting piece is provided with an arc-shaped positive electrode bending section; one end of the negative electrode connecting piece is provided with a negative electrode connecting hole for fitting and connecting the negative electrode current collector, and the other end of the negative electrode connecting piece is provided with an arc-shaped negative electrode bending section.

[0013] The inner surface of the cover is provided with an insulating ring that is concentrically mounted with the core shaft. The positive and negative bending sections are circularly enclosed outside the insulating ring, and the positive and negative bending sections do not contact each other.

[0014] Compared with the prior art, the main feature of this invention is that a positive electrode tab and a negative electrode tab are arranged on the same side at one end of the winding core. A combined current collector plate is provided with a positive current collector and a negative current collector, which are insulated from each other. A combined cover plate is provided with a positive current collector post and a negative current collector post, which are also insulated from each other. Thus, it is only necessary to install the combined current collector plate on one end of the winding core with the positive and negative electrode tabs, weld the positive electrode tab to the positive current collector for conductivity, and weld the negative electrode tab to the negative current collector for conductivity. Then, install the combined cover plate on the combined current collector plate, weld the positive current collector to the positive current collector post for conductivity, and weld the negative current collector to the negative current collector post for conductivity. Finally, the winding core and the combined current collector plate are assembled. Assembly is completed by inserting the battery into the outer casing through the port, and then sealing the port with a combination cover. At this point, the positive electrode tab, positive current collector, and positive current collector post are connected in sequence to draw out the positive current, and the negative electrode tab, negative current collector, and negative current collector post are connected in sequence to draw out the negative current. Obviously, this simplification of the numerous components in the traditional battery structure to the outer casing, core, combination current collector, and combination cover makes the structure simpler and the assembly more convenient. In particular, the innovative design of positive and negative current collector posts on the same end of the battery allows for the simultaneous drawing out of positive and negative currents from the same end of the battery, thus meeting the needs of certain special applications. Moreover, the improved battery structure with positive and negative electrodes on the same side, combined with the corresponding manufacturing method, greatly facilitates the automated production of batteries. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the present invention.

[0016] Figure 2 for Figure 1 A three-dimensional sectional view of the battery head.

[0017] Figure 3 for Figure 1 Top view.

[0018] Figure 4 This is a schematic diagram of the combined collector disk structure.

[0019] Figure 5for Figure 4 A three-dimensional image.

[0020] Figure 6 for Figure 4 Rear view.

[0021] Figure 7 for Figure 6 A three-dimensional image.

[0022] Figure 8 This is a schematic diagram of the disk's structure.

[0023] Figure 9 for Figure 8 A three-dimensional image.

[0024] Figure 10 This is a schematic diagram of the positive current collector.

[0025] Figure 11 for Figure 10 A three-dimensional image.

[0026] Figure 12 This is a structural schematic diagram of the combined cover plate.

[0027] Figure 13 for Figure 12 Sectional view A-A (with the cap removed).

[0028] Figure 14 for Figure 12 A three-dimensional image.

[0029] Figure 15 for Figure 13 Rear view.

[0030] Figure 16 for Figure 15 A three-dimensional image.

[0031] Figure 17 This is a schematic diagram of the unfolded structure of the core. Detailed Implementation

[0032] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0033] like Figures 1 to 17As shown, 1. Outer shell, 2. Core, 21. Separator paper, 22. Negative electrode plate, 221. Negative electrode tab, 23. Positive electrode plate, 231. Positive electrode tab, 3. Combined current collector, 31. Plate body, 311. Liquid inlet hole, 312. Mounting notch, 313. Protrusion, 32. Positive current collector, 321. Positive electrode body, 322. Positive electrode segment, 323. Positive electrode elastic sheet, 33. Negative current collector, 331. Negative electrode body, 332. Negative electrode... 333. Negative electrode elastic sheet, 34. Cutting groove, 35. Mounting platform, 36. Small hole, 4. Combined cover plate, 41. Cover body, 411. Injection hole, 42. Positive electrode current collector, 43. Negative electrode current collector, 44. Sealing cap, 45. Explosion-proof valve, 46. Positive electrode connecting piece, 461. Positive electrode connecting hole, 462. Positive electrode bending section, 47. Negative electrode connecting piece, 471. Negative electrode connecting hole, 472. Negative electrode bending section, 48. Insulating ring.

[0034] A battery structure with positive and negative electrodes on the same side is widely applicable to the production of lithium or sodium batteries. The battery structure includes, for example... Figures 1-3 As shown, it is mainly composed of an outer shell 1, a core 2, a combined collector plate 3, and a combined cover plate 4. The outer shell 1 is a cylindrical shell that is closed at one end and has a port at the other end.

[0035] The winding core 2 has a positive electrode tab 231 and a negative electrode tab 221 arranged on the same side at one end, that is, the positive electrode tab and the negative electrode tab are located at the same end of the winding core 2. In this embodiment, the winding core is as follows: Figure 17 As shown, firstly, multiple positive electrode tabs 231 are cut along the length of the long side of a rectangular positive electrode plate 23, and multiple negative electrode tabs 221 are cut along the length of the long side of a rectangular negative electrode plate 22. Then, the separator paper 21, negative electrode plate 23, separator paper 21 and positive electrode plate 22 are stacked in sequence, with the positive electrode tabs and negative electrode tabs on the same side. Then, the positive electrode plate 22 is wound into a cylindrical core 2 with the outermost separator paper 21 on the outside of the winding. At this time, the positive electrode tabs 231 and negative electrode tabs 221 located at the same end of the core are flattened by upsetting.

[0036] The combined collector disk 3, as described above Figures 4-7 As shown, the device includes a disc-shaped body 31 made of an insulating material, such as plastic or ceramic with insulating properties. The disc 31 has a liquid inlet 311 and two mounting slots 312. The liquid inlet 311 is located at the center of the disc 31, and its center overlaps with the core axis. The two mounting slots 312 are symmetrically arranged around the core axis, i.e., around the liquid inlet 311. A positive current collector 32 and a negative current collector 33 are respectively positioned and installed within these two mounting slots. In this embodiment, the two mounting slots 312 are as follows... Figure 8As shown, it is fan-shaped, and the corresponding positive current collector 32 and negative current collector 33 are both fan-shaped plates.

[0037] The positive current collector 32 is as follows Figure 10 , Figure 11 As shown, it includes a positive electrode body 321 and a positive electrode segment 322. The positive electrode body 321 is fan-shaped and matches the shape of the mounting notch 312. Therefore, the positive electrode current collector 32 is fitted into the mounting notch 312 through the positive electrode body 321. Then, it is fixedly installed by three-point positioning through the mounting platform 35 at the two bottom corners and near the center corner of the positive electrode body 321. There are many ways to fix it. For example, if the disc body 31 in this embodiment is made of plastic, it can be fixed by directly inserting the protrusion 313 on the disc body 31 into the small hole 36 on the mounting platform 35 and then hot-melting the plastic.

[0038] The positive electrode segment 322 is connected at one end to the positive electrode body 321. Specifically, the positive electrode body has a positive electrode elastic sheet 323 formed by a cut groove 34, and one end of the positive electrode segment 322 is welded and fixed to the positive electrode elastic sheet 323 to form an elastic connection. The purpose is to prevent it from falling off when the battery is working in a vibration environment, thus ensuring the reliability of the structure. This embodiment is an example of... Figure 10 , Figure 11 As shown, the positive electrode elastic sheet 323 is cut by the cutting groove 34 to form a cantilever beam structure on the positive electrode body 321 with one end connected and the other end suspended. Then, one end of the positive electrode section 322 only needs to be welded and fixed to the most elastic suspended end, while the other end of the positive electrode section 322 is suspended and extends on the disc body 31. Of course, there are many other design structures for the positive electrode elastic sheet 323. Generally, as long as it has an elastic design, it can be applied to this utility model.

[0039] The negative current collector 33 and the positive current collector 32 have the same structure and shape. The negative current collector 331 is positioned and installed in another mounting slot 312 on the disk body 31, and the negative current collector segment 332 is elastically connected to the negative current collector 333 at one end and suspended and extended on the disk body 31 at the other end. The negative current collector 333 is also cut and hollowed out by a cutting groove with the same structure as the positive current collector 323. Therefore, in this utility model, the cutting grooves 34 designed on the positive current collector 321 and the negative current collector 331 respectively adopt the same component number.

[0040] Meanwhile, both the positive electrode section 322 and the negative electrode section 332 are arc-shaped sections, and the positive and negative electrode sections are circularly enclosed with the core axis, that is, the liquid inlet hole 311 as the center. The positive and negative electrode sections should not be in contact with each other so as to insulate the positive and negative current collectors from each other and avoid short circuits.

[0041] In this way, by combining the disk body 31, the positive current collector 32 and the negative current collector 33, the combined current collector 3 can be formed into a combined component. Therefore, the combined current collector 3 can be manufactured in advance for backup during the actual assembly process.

[0042] The combined cover plate 4, as described above Figures 12-16 As shown, the battery includes a circular cover 41 with an injection hole 411, a positive current collector 42, and a negative current collector 43. The injection hole 411 is located at the center of the cover 41, and the axis of the injection hole overlaps with the axis of the core. The positive current collector 42 and the negative current collector 43 are symmetrically installed with the axis of the core, i.e., with the injection hole 411 as the center. An explosion-proof valve 45 is also provided to ensure the safety of the battery. The injection hole 411 is provided with an openable and closable cap 44, which closes the injection hole 411 after the injection is completed.

[0043] The positive current collector 42 and the negative current collector 43 are as follows: Figure 2 The mounting holes on the cover 41 are fitted together as shown. The inner surface of the cover 31 is provided with a positive electrode connecting piece 46 that is conductively connected to the positive current collector 42 and a negative electrode connecting piece 47 that is conductively connected to the negative current collector 43. One end of the positive electrode connecting piece 46 is fitted to the positive current collector 42 through the positive electrode connecting hole 461 and welded to fix it. The other end of the positive electrode connecting piece 46 is provided with an arc-shaped positive electrode bending section 462. One end of the negative electrode connecting piece 47 is fitted to the negative current collector 43 through the negative electrode connecting hole 471 and welded to fix it. The other end of the negative electrode connecting piece 47 is provided with an arc-shaped negative electrode bending section 472.

[0044] Furthermore, the inner surface of the cover 41 is provided with an insulating ring 48 that is concentrically mounted with the core shaft, that is, with the liquid injection hole 411. The insulating ring is made of insulating material, such as a plastic ring or a ceramic ring with insulating properties. Then, the positive electrode bending section 462 and the negative electrode bending section 472 are exactly circularly enclosed outside the insulating ring 48. The positive and negative electrode bending sections should not be in contact with each other, so that the positive and negative electrode connecting pieces are insulated from each other to avoid short circuit.

[0045] In this way, by combining the cover 41, the positive electrode connecting piece 46, the positive electrode current collector 42, the negative electrode connecting piece 47, and the negative electrode current collector 43, the combined cover plate 4 can form a combined component. Therefore, the combined cover plate 4 can be manufactured in advance for backup during the actual assembly process.

[0046] The combined current collector 3 is installed at one end of the core 2 which has positive and negative electrodes. The positive electrode 231 is then welded to the positive electrode body 321 of the positive current collector 32 to form conductivity, and the negative electrode 221 is welded to the negative electrode body 331 of the negative current collector 33 to form conductivity. Moreover, for the convenience of welding, the positions of the positive electrode 231 and the positive electrode body 321, and the negative electrode 221 and the negative electrode body 331 are usually aligned when installing the combined current collector 3.

[0047] The combined cover plate 4 is installed on the combined collector plate 3, and the circle formed by the positive and negative electrode sections fits perfectly outside the circle formed by the positive and negative electrode bending sections. The positive electrode section 322 is in contact with the positive electrode bending section 462, and the negative electrode section 332 is in contact with the negative electrode bending section 472. The positive electrode section 322 and the positive electrode bending section 462 are not in contact with the negative electrode section 332 and the negative electrode bending section 372 and are mutually insulated. Therefore, it is only necessary to weld and fix the contacting positive electrode section 322 and the positive electrode bending section 462 from the side to form conductivity, and welding and fixing the contacting negative electrode section 332 and the negative electrode bending section 472 will also form conductivity.

[0048] Therefore, the structure can be assembled simply by inserting the core 2 and the combined current collector 3 into the outer shell through the port of the outer shell 1, and then sealing the port with the combined cover plate 4. Then, the positive electrode tab 231, the positive current collector 32 and the positive current collector column 42 will be connected in sequence to draw out the positive current. Similarly, the negative electrode tab 221, the negative current collector 33 and the negative current collector column 43 will also be connected in sequence to draw out the negative current.

[0049] The manufacturing method of this battery includes the following steps:

[0050] Step 1: Manufacturing the core, assembling the manifold and the cover plate.

[0051] Manufacturing cores

[0052] ① Multiple positive electrode tabs 231 are cut sequentially along the length direction on the long side of the positive electrode plate 23, and multiple negative electrode tabs 221 are cut sequentially along the length direction on the long side of the negative electrode plate 22.

[0053] ② The positive electrode 23, the negative electrode 22 and the separator paper 21 are stacked and wound into a core 2, so that the positive and negative electrode tabs are located at the same end of the core 2;

[0054] ③ The multiple positive electrode tabs 231 located at the same end of the core 2 are upset and flattened, and the multiple negative electrode tabs 221 are also upset and flattened. The so-called upset flattening method is different from the traditional winding and cutting method. It usually refers to using an upset head driven by an upset machine to flatten the multiple positive electrode tabs 231 and the multiple negative electrode tabs 221 at the same end of the core 2. Since it is not within the protection scope of this utility model, the upset flattening method will not be described in detail.

[0055] Manufacturing combined collector disk

[0056] ① The positive electrode body 321 of the positive electrode current collector 32 is positioned and installed in one of the mounting slots 312 of the disk body 31 by a three-point positioning method, and the negative electrode body 331 of the negative electrode current collector 33 is positioned and installed in the other mounting slot 312 of the disk body 31 by a three-point positioning method.

[0057] ② One end of the positive electrode segment 322 is elastically connected to the positive electrode elastic sheet 323 of the positive electrode body 321, and the other end of the positive electrode segment 322 is suspended and extends on the disk body 31. The positive electrode body 321, the positive electrode segment 322 and the positive electrode elastic sheet 323 can be integrally stamped. One end of the negative electrode segment 332 is elastically connected to the negative electrode elastic sheet 333 of the negative electrode body 331, and the other end of the negative electrode segment 332 is suspended and extends on the disk body 31. The negative electrode body 331, the negative electrode segment 332 and the negative electrode elastic sheet 333 can also be integrally stamped. The positive and negative electrode segments are then enclosed in a circle with the core axis as the center. The positive and negative electrode segments do not contact each other and are mutually insulated.

[0058] Manufacturing composite cover plate

[0059] ①The cover 41 is provided with a liquid injection hole 411, a positive current collector 42, a negative current collector 43 and an explosion-proof valve 45;

[0060] ② The inner surface of the cover 41 is provided with a positive electrode connecting piece 46, a negative electrode connecting piece 47, and an insulating ring 48 that is concentrically installed with the core shaft. One end of the positive electrode connecting piece 46 is fitted to the positive electrode current collector 42 through the positive electrode connecting hole 461 and forms conductivity. The other end of the positive electrode connecting piece 46 is provided with an arc-shaped positive electrode bending section 462. One end of the negative electrode connecting piece 47 is fitted to the negative electrode current collector 43 through the negative electrode connecting hole 471 and forms conductivity. The other end of the negative electrode connecting piece 47 is provided with an arc-shaped negative electrode bending section 472.

[0061] ③ The positive electrode bending section 462 and the negative electrode bending section 472 are arranged in a circle around the insulating ring 48, and the positive and negative electrode bending sections are not in contact with each other and are mutually insulated.

[0062] Step 2: Installation between the combined collector plate and the winding core

[0063] The combined current collector 3 is installed on one end of the core 2 with positive and negative electrodes on the same side, and the positive electrode 231 of the core end is welded and fixed to the positive current collector 32 of the combined current collector 3 to form conductivity, and the negative electrode 221 is welded and fixed to the negative current collector 33 of the combined current collector 3 to form conductivity.

[0064] Step 3: Installation between the combined cover plate and the combined manifold

[0065] ① The combined cover plate 4 is installed on the combined current collector plate 3. Through the unique design that both the positive electrode section 322 and the negative electrode section 332 are arc-shaped sections, the circle formed by the positive electrode section 322 and the negative electrode section 332 fits perfectly outside the circle formed by the positive and negative electrode bending sections. The positive electrode section 322 is in contact with the positive electrode bending section 462, and the negative electrode section 332 is in contact with the negative electrode bending section 472. The positive electrode section 322 and the positive electrode bending section 462 are not in contact with the negative electrode section 332 and the negative electrode bending section 472 and are mutually insulated.

[0066] ② The positive electrode section 322 and the positive electrode bending section 462 that are in contact with each other are welded and fixed to form a conductive structure, and the negative electrode section 332 and the negative electrode bending section 472 that are in contact with each other are welded and fixed to form a conductive structure.

[0067] Step 4: Assembly of the core, combined manifold, combined cover plate, and outer shell.

[0068] The welded and assembled core 2, combined collector plate 3 and combined cover plate 4 are sequentially inserted into the outer shell 1 from the port of the outer shell 1. The combined cover plate 4 is circumferentially welded to cover and seal the port.

[0069] Step 5: Injecting fluid and sealing the well.

[0070] After injecting electrolyte into the core through the injection hole and the inlet hole in sequence, the injection hole is sealed with a cap to complete the battery manufacturing process.

[0071] This utility model simplifies the numerous components of a traditional battery structure into a shell 1, a core 2, a combined current collector 3, and a combined cover plate 4. This results in a simpler structure, easier assembly, improved flexibility, and reduced manufacturing costs. In particular, the innovative design of a positive current collector 42 and a negative current collector 43 at the same end of the battery allows for the simultaneous extraction of positive and negative currents from the same end, thus meeting the needs of certain special applications.

[0072] In addition, the improved battery structure with positive and negative electrodes on the same side, combined with the corresponding manufacturing method, greatly facilitates the automated production of batteries, thus possessing broad market and economic value.

[0073] The embodiments described above are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the teachings of this utility model, those skilled in the art can make various alterations or modifications to it, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A battery structure with positive and negative electrodes on the same side, comprising a casing (1), a winding core (2), a combined current collector (3), and a combined cover plate (4), characterized in that, The winding core (2) has a positive electrode tab (231) and a negative electrode tab (221) arranged on the same side at one end; the combined current collector (3) has a positive current collector plate (32) and a negative current collector plate (33), and the positive and negative current collector plates are insulated from each other; the combined cover plate (4) has a positive current collector column (42) and a negative current collector column (43), and the positive and negative current collector columns are insulated from each other; The combined current collector (3) is installed at one end of the core (2) which has positive and negative pole tabs. The combined cover plate (4) is installed on the combined current collector (3). Both the core (2) and the combined current collector (3) are inserted into the outer shell through the port of the outer shell (1) and the port is covered and sealed by the combined cover plate (4). The positive electrode tab (231), positive current collector (32) and positive current collector column (42) are sequentially connected to conduct electricity and lead out the positive current; the negative electrode tab (221), negative current collector (33) and negative current collector column (43) are sequentially connected to conduct electricity and lead out the negative current.

2. The battery structure with positive and negative electrodes on the same side according to claim 1, characterized in that... The combined current collector (3) includes a disc-shaped disc body (31) with an inlet hole (311) and two mounting slots (312) symmetrically arranged with the core shaft as the center. The positive current collector (32) and the negative current collector (33) are respectively positioned and installed in the two mounting slots (312).

3. The battery structure with positive and negative electrodes on the same side according to claim 2, characterized in that... The positive current collector (32) includes a positive electrode body (321) positioned and installed in one of the mounting slots (312), and a positive electrode section (322) with one end connected to the positive electrode body and the other end suspended and extending on the disk (31); the negative current collector (33) includes a negative electrode body (331) positioned and installed in another mounting slot (312), and a negative electrode section (332) with one end connected to the negative electrode body and the other end suspended and extending on the disk (31).

4. A battery structure with positive and negative electrodes on the same side according to claim 3, characterized in that... The positive electrode section (322) and the negative electrode section (332) are both arc-shaped sections, and the positive and negative electrode sections are enclosed in a circle with the core axis as the center, and the positive and negative electrode sections do not make contact with each other.

5. A battery structure with positive and negative electrodes on the same side according to claim 3, characterized in that... The positive electrode body (321) is provided with a positive electrode elastic sheet (323) formed by cutting groove (34), and one end of the positive electrode segment (322) is fixed on the positive electrode elastic sheet (323) to form an elastic connection; the negative electrode body (331) is provided with a negative electrode elastic sheet (333) formed by cutting groove (34), and one end of the negative electrode segment (332) is fixed on the negative electrode elastic sheet (333) to form an elastic connection.

6. A battery structure with positive and negative electrodes on the same side according to claim 1, characterized in that... The combined cover plate (4) includes a circular cover body (41) with an injection hole (411), a positive current collector (42), a negative current collector (43) and an explosion-proof valve (45) on it; the injection hole (411) is provided with an openable and closable cap (44).

7. A battery structure with positive and negative electrodes on the same side according to claim 6, characterized in that... The inner surface of the cover (41) is provided with a positive electrode connecting piece (46) that is conductively connected to the positive electrode current collector (42) and a negative electrode connecting piece (47) that is conductively connected to the negative electrode current collector (43). The combined cover plate (4) is installed on the combined current collector plate (3). The positive electrode connecting piece (46) is conductively connected to the positive electrode current collector (32) and the negative electrode connecting piece (47) is conductively connected to the negative electrode current collector (33).

8. A battery structure with positive and negative electrodes on the same side according to claim 7, characterized in that... One end of the positive electrode connecting piece (46) is provided with a positive electrode connecting hole (461) for fitting and connecting the positive electrode current collector (42), and the other end of the positive electrode connecting piece (46) is provided with an arc-shaped positive electrode bending section (462); one end of the negative electrode connecting piece (47) is provided with a negative electrode connecting hole (471) for fitting and connecting the negative electrode current collector (43), and the other end of the negative electrode connecting piece (47) is provided with an arc-shaped negative electrode bending section (472).

9. A battery structure with positive and negative electrodes on the same side according to claim 8, characterized in that... The inner surface of the cover (41) is provided with an insulating ring (48) that is concentrically mounted with the core shaft. The positive electrode bending section (462) and the negative electrode bending section (472) are circularly enclosed outside the insulating ring (48), and the positive and negative electrode bending sections do not contact each other.

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