High-current power type lithium-manganese battery

Abstract

The utility model relates to the technical field of lithium-manganese batteries and provides a high-current power type lithium-manganese battery which comprises a shell, a battery cell is arranged on the inner side of the shell, the bottom of the battery cell is welded with the bottom wall of the shell, an electrode assembly is arranged at the top end of the battery cell, and the electrode assembly comprises a positive plate and a negative plate. The positive plate and the negative plate are fixedly connected to the two sides of the battery cell respectively, and the tops of the positive plate and the negative plate are welded with a positive tab and a negative tab respectively. According to the utility model, the welding flux is filled in the welding hole on the pole piece, and then the pole piece and the positive pole lug are fixed by spot welding through the welding flux, and the contact area of the welding flux and the welding hole is large, so that the firmness between the positive pole lug and a welding point is greatly improved, and the problem of poor stability of the welding point of plane spot welding in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium manganese batteries, and in particular to a high-current power type lithium manganese battery. Background Art

[0002] Lithium manganese battery is a typical organic electrolyte lithium battery. It was invented and successfully developed by Japan's Sanyo Electric Company in 1975 and was immediately launched on the market. The internal electrode structure of the battery can be designed and manufactured into carbon-wrapped, wound, and laminated types, and the battery shape can be designed and manufactured into coin-shaped, cylindrical, and square shapes to meet the use requirements of electrical appliances of different sizes and currents.

[0003] After searching, the Chinese patent publication number CN203596382U discloses "a lithium manganese battery, including a metal shell and a cover plate, wherein a box body formed by the metal shell and the cover plate is provided with a battery cell and filled with electrolyte, and a plurality of notched grooves are provided on the side of the metal shell; a positive terminal and a negative terminal are provided on the cover plate, and an explosion-proof valve is provided between the positive terminal and the negative terminal".

[0004] The positive electrode tab and negative electrode tab of this type of patent are connected to the corresponding positive electrode connecting sheet and negative electrode connecting sheet respectively, and the connection method adopts the welding method in the prior art, wherein the tab of the positive electrode sheet is directly welded to the current collector through plane spot welding. Due to the small welding fixing surface, the phenomenon of cold welding is very easy to occur, resulting in a very unstable welding point. Utility Model Content

[0005] The utility model provides a high-current power lithium-manganese battery, which solves the problem of poor stability of welding points in plane spot welding in the prior art.

[0006] The technical solution of the utility model is as follows: a high-current power lithium-manganese battery, comprising a shell, a battery cell is arranged on the inner side of the shell, the bottom of the battery cell is welded to the bottom wall of the shell, an electrode assembly is arranged on the top of the battery cell, the electrode assembly comprises a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and the negative electrode sheet are respectively fixedly connected to the two sides of the battery cell, and the tops of the positive electrode sheet and the negative electrode sheet are respectively welded with a positive electrode ear and a negative electrode ear.

[0007] Preferably, the positive electrode sheet comprises a pole sheet, the middle and both ends of the pole sheet are provided with welding holes, the inner wall of the welding hole in the middle of the pole sheet is spot welded to the positive electrode tab, and the inner walls of the welding holes at both ends of the pole sheet are welded with the same current collector.

[0008] Preferably, the current collector is an aluminum mesh with hexagonal mesh, and the surface density of the aluminum mesh is 200-300g / m2.

[0009] Preferably, the positive electrode tab comprises an aluminum strip, the aluminum strip is welded to the pole piece, and a stainless steel strip is welded to the top of the aluminum strip.

[0010] Preferably, the outermost circle of the battery core is wrapped with kraft paper, and the specifications of the kraft paper match the battery core.

[0011] Preferably, a cover plate is slidably connected to the top of the shell, and the two ends of the top of the cover plate are respectively fixedly connected to a positive terminal and a negative terminal, and the positive terminal and the negative terminal are respectively welded to the top of the positive electrode tab and the negative electrode tab.

[0012] Preferably, an explosion-proof valve is fixedly installed in the middle of the top of the cover plate.

[0013] Preferably, a pad plate 1 is fixedly connected to the bottom of the inner side of the shell, the top of the pad plate 1 is welded to the battery core, and a pad plate 2 is fixedly connected to the bottom of the cover plate.

[0014] Preferably, one end of the second pad is provided with a slot one that matches the positive electrode tab, and the other end of the second pad is provided with a slot two that matches the negative electrode tab.

[0015] Preferably, the structure of the positive electrode tab is exactly the same as that of the negative electrode tab.

[0016] The technical effects and advantages of the utility model are as follows: by filling the welding hole on the pole piece with solder, and then fixing the solder to the positive pole ear by spot welding, since the contact area between the solder and the welding hole is large, the firmness between the positive pole ear and the welding point is greatly improved, thereby greatly improving the welding stability between the positive pole ear and the pole piece, and at the same time, the spot welding time is short, which can realize the rapid fixation of the positive pole ear and the pole piece, greatly saving the assembly time of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a structural schematic diagram of a high-current power lithium-manganese battery.

[0018] Figure 2 The utility model is a schematic diagram of the internal structure of a high-current power lithium-manganese battery.

[0019] Figure 3 It is a schematic structural diagram of the electrode assembly of the utility model.

[0020] Figure 4 It is a structural schematic diagram of the positive electrode sheet of the utility model.

[0021] Figure 5 It is a schematic structural diagram of the current collector of the present utility model.

[0022] Figure 6 It is a schematic structural diagram of the positive electrode ear of the utility model.

[0023] Figure 7 It is a structural schematic diagram of the pad 2 of the utility model.

[0024] The accompanying drawings are marked as follows: 1. shell; 2. cover plate; 3. battery cell; 4. electrode assembly; 41. positive electrode sheet; 411. electrode sheet; 412. welding hole; 413. current collector; 42. positive electrode tab; 421. aluminum strip; 422. stainless steel strip; 43. negative electrode sheet; 44. negative electrode tab; 5. pad one; 6. pad two; 61. slot one; 62. slot two; 7. positive terminal; 8. negative terminal; 9. explosion-proof valve. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Reference Figure 1 - Figure 5 The utility model provides a high-current power lithium-manganese battery, including a shell 1, a battery cell 3 is arranged on the inner side of the shell 1, the bottom of the battery cell 3 is welded to the bottom wall of the shell 1, an electrode assembly 4 is arranged on the top of the battery cell 3, the electrode assembly 4 includes a positive electrode sheet 41 and a negative electrode sheet 43, the positive electrode sheet 41 and the negative electrode sheet 43 are respectively fixedly connected to the two sides of the battery cell 3, and the tops of the positive electrode sheet 41 and the negative electrode sheet 43 are respectively welded and connected with a positive electrode tab 42 and a negative electrode tab 44; the outermost circle of the battery cell 3 is wrapped with kraft paper, and the specifications of the kraft paper match the battery cell 3; the kraft paper can protect the battery cell 3 and effectively prevent the problem of circuit failure caused by moisture in the battery cell 3.

[0027] The positive electrode sheet 41 includes a pole piece 411, and welding holes 412 are opened in the middle and at both ends of the pole piece 411. The inner wall of the welding hole 412 in the middle of the pole piece 411 is spot-welded to the positive electrode ear 42, and the inner walls of the welding holes 412 at both ends of the pole piece 411 are welded with the same current collector 413, and the current collector 413 is an aluminum mesh with hexagonal mesh, and the surface density of the aluminum mesh is 200-300g / m2;

[0028] By filling the welding hole 412 on the pole piece 411 with solder and then spot-welding the solder to the positive pole tab 42, due to the large contact area between the solder and the welding hole 412, the firmness between the positive pole tab 42 and the welding point is greatly improved, thereby greatly improving the welding stability between the positive pole tab 42 and the pole piece 411. At the same time, the spot welding has a short welding time, which can achieve rapid fixation of the positive pole tab 42 and the pole piece 411, greatly saving the assembly time of the battery.

[0029] Reference Figure 6 The positive electrode tab 42 includes an aluminum strip 421 , which is welded to the electrode piece 411 , and a stainless steel strip 422 is welded to the top of the aluminum strip 421 .

[0030] Reference Figure 1 - Figure 7 The top of the shell 1 is slidably connected with a cover plate 2, and the two ends of the top of the cover plate 2 are respectively fixedly connected with a positive terminal 7 and a negative terminal 8, which are respectively welded to the top of the positive pole ear 42 and the negative pole ear 44. An explosion-proof valve 9 is fixedly installed in the middle of the top of the cover plate 2, and a pad 1 5 is fixedly connected to the bottom of the inner side of the shell 1. The top of the pad 1 5 is welded to the battery cell 3, and a pad 2 6 is fixedly connected to the bottom of the cover plate 2. A slot 1 61 matching the positive pole ear 42 is provided at one end of the pad 2 6, and a slot 2 62 matching the negative pole ear 44 is provided at the other end of the pad 2 6. The structures of the positive pole ear 42 and the negative pole ear 44 are exactly the same. The explosion-proof valve 9 can be used as a weak point of the sealed space formed by the cover plate 2 and the shell 1. When the heat inside the battery causes the gas to expand, the gas can be ruptured through the explosion-proof valve to prevent the overall explosion, which greatly improves the safety of the battery.

[0031] The working principle of the utility model is as follows: when assembling the battery, first, spot weld the current collector 413 in the middle and the head, and then stick glue after spot welding, wherein the negative current collector is attached to the upper right side of the negative electrode, and then the battery chip is wound into a battery core 3, with the positive current collector on one side and the negative current collector on the other side, the outermost circle of the battery core 3 is wrapped with kraft paper, the battery core 3 is put into the shell, and the bottom is spot welded, the negative current collector is spot welded to the bottom of the shell 1, the positive current collector is spot welded to the cover group, and the two current collectors are spot welded on the same cover group; then the peripheral welding is performed, the battery body is welded with a tungsten electrode, and a short-circuit test is performed on it after the welding is completed; finally, liquid is injected to seal, the battery body is weighed, and an appropriate amount of electrolyte is injected according to the weight of the battery body, and the battery is sealed with sealing nails.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high current power lithium manganese battery, comprising a housing (1), characterized in that: A battery cell (3) is arranged on the inner side of the shell (1), the bottom of the battery cell (3) is welded to the bottom wall of the shell (1), an electrode assembly (4) is arranged on the top of the battery cell (3), the electrode assembly (4) comprises a positive electrode sheet (41) and a negative electrode sheet (43), the positive electrode sheet (41) and the negative electrode sheet (43) are respectively fixedly connected to two sides of the battery cell (3), and the tops of the positive electrode sheet (41) and the negative electrode sheet (43) are respectively welded to a positive electrode tab (42) and a negative electrode tab (44).

2. A high current power type lithium manganese battery according to claim 1, characterized in that: The positive electrode sheet (41) comprises a pole sheet (411), the middle part and both ends of the pole sheet (411) are provided with welding holes (412), the inner wall of the welding hole (412) in the middle of the pole sheet (411) is spot-welded to the positive electrode tab (42), and the inner walls of the welding holes (412) at both ends of the pole sheet (411) are welded with the same current collector (413).

3. A high current power type lithium manganese battery according to claim 2, characterized in that: The current collector (413) is an aluminum mesh with hexagonal meshes, and the surface density of the aluminum mesh is 200-300g / m2.

4. A high current power type lithium manganese battery according to claim 2, characterized in that: The positive electrode tab (42) comprises an aluminum strip (421), the aluminum strip (421) is welded to the pole piece (411), and a stainless steel strip (422) is welded to the top of the aluminum strip (421).

5. A high current power type lithium manganese battery according to claim 1, characterized in that: The outermost circle of the battery core (3) is wrapped with kraft paper, and the specifications of the kraft paper match those of the battery core (3).

6. A high current power type lithium manganese battery according to claim 1, characterized in that: The top of the shell (1) is slidably connected to a cover plate (2), and the two ends of the top of the cover plate (2) are respectively fixedly connected to a positive terminal (7) and a negative terminal (8), and the positive terminal (7) and the negative terminal (8) are respectively welded to the top of the positive electrode tab (42) and the negative electrode tab (44).

7. A high current power type lithium manganese battery according to claim 6, characterized in that: An explosion-proof valve (9) is fixedly installed in the middle of the top of the cover plate (2).

8. A high current power type lithium manganese battery according to claim 6, characterized in that: A pad one (5) is fixedly connected to the bottom of the inner side of the shell (1), the top of the pad one (5) is welded to the battery core (3), and a pad two (6) is fixedly connected to the bottom of the cover plate (2).

9. A high current power type lithium manganese battery according to claim 8, characterized in that: One end of the second pad (6) is provided with a first slot (61) matching with the positive electrode tab (42), and the other end of the second pad (6) is provided with a second slot (62) matching with the negative electrode tab (44).

10. A high current power lithium manganese battery according to claim 9, characterized in that: The structures of the positive electrode tab (42) and the negative electrode tab (44) are completely the same.

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