Lithium-manganese battery processing method and lithium-manganese battery

Abstract

The invention relates to the technical field of battery production, and discloses a lithium-manganese battery processing method and a lithium-manganese battery. The lithium-manganese battery processing method can simplify the battery processing technology, reduce the potential quality hazard of the battery and improve the performance of the battery. Comprising the steps that S1, powder is attached to an aluminum net, a positive electrode coiled material in a regular stripe shape is formed after film combination, the positive electrode coiled material is provided with a plurality of strip-shaped aluminum net areas and a plurality of strip-shaped positive electrode areas which are arranged at intervals, the positive electrode areas contain the powder, and the aluminum net areas do not contain the powder; s2, cutting the positive electrode coiled material into a plurality of positive electrode plates, wherein each positive electrode plate is provided with a first aluminum mesh area and a first positive electrode plate; s3, after the positive plate is dried, the positive plate, the diaphragm and the lithium strip are jointly wound to form a battery cell, and in the axial direction of the battery cell, the first positive electrode area exceeds the lithium strip, and the first aluminum net area exceeds the diaphragm to serve as a positive tab of the battery cell; and S4, loading the battery cell into the shell, welding the negative tab arranged on the lithium strip with the shell, sealing and pressing the cover group at the opening of the shell, and abutting the metal net of the cover group against the positive tab.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a lithium manganese battery processing method and a lithium manganese battery. Background Technology

[0002] While all-tab batteries offer numerous performance improvements, their manufacturing processes still require improvement. Firstly, the processes of flattening, cutting, and welding the current collectors in all-tab batteries are complex and have low production efficiency. Secondly, the flattening process can easily deform the separator, leading to micro-short circuits and causing metal debris to fall into the battery, thus reducing its lifespan and potentially causing safety issues such as short circuits. Furthermore, existing all-tab patents are all applied to lithium-ion batteries, with no known applications in primary lithium batteries.

[0003] Therefore, there is an urgent need for a lithium manganese battery processing method and a lithium manganese battery to solve the above problems. Summary of the Invention

[0004] One objective of this invention is to provide a lithium manganese battery processing method that simplifies the battery processing technology, reduces potential battery quality issues, and improves battery performance.

[0005] Based on the above concept, the technical solution adopted by this invention is as follows:

[0006] A method for processing lithium manganese batteries is provided, comprising the following steps:

[0007] S1. Powder is attached to an aluminum mesh, and after lamination, a positive electrode roll with regular stripes is formed. The positive electrode roll has multiple aluminum mesh areas and multiple positive electrode areas that are spaced apart and in strip shape. The positive electrode areas contain powder, while the aluminum mesh areas do not contain powder.

[0008] S2. Cut the positive electrode roll into multiple positive electrode sheets, each of the positive electrode sheets having a first aluminum mesh area and a first positive electrode area;

[0009] S3. After the positive electrode sheet is dried, it is wound together with the separator and lithium strip to form a battery cell. In the axial direction of the battery cell, the first positive electrode area extends beyond the lithium strip, and the first aluminum mesh area extends beyond the separator as the positive electrode tab of the battery cell.

[0010] S4. The battery cell is installed into the housing. The negative electrode tab on the lithium strip is welded to the housing. The cover assembly is sealed and pressed against the opening of the housing. The metal mesh of the cover assembly abuts against the positive electrode tab.

[0011] Optionally, step S2 further includes attaching powder to the aluminum mesh, the powder being irregularly striped on the aluminum mesh, and removing excess powder by cleaning the powder to make the irregular stripes become regular stripes.

[0012] Optionally, the positive electrode roll includes N+1 aluminum mesh areas and N positive electrode areas spaced apart, with both ends of the positive electrode roll in the width direction being the aluminum mesh areas.

[0013] Optionally, all N positive electrode regions are second positive electrode regions, and the N+1 aluminum mesh regions include N-1 second aluminum mesh regions and 2 third aluminum mesh regions. The second aluminum mesh regions are located between two adjacent second positive electrode regions, and the third aluminum mesh regions are located at both ends of the width direction of the positive electrode roll.

[0014] The width of the second positive electrode region is a1, the width of the second aluminum mesh region is a2, the width of the third aluminum mesh region is a3, the width of the first positive electrode region is b1, the width of the first aluminum mesh region is b2, 2b1=a1, 2b2=a2=2a3.

[0015] Optionally, in the axial direction of the battery cell, the width of the first positive electrode region is b1, the width of the first aluminum mesh region is b2, the width of the lithium strip is c, and the width of the separator is d, where c < b1, b1 < d, and d < b1 + b2.

[0016] Optionally, in the axial direction of the battery cell, the width of the first positive electrode region is b1, the width of the first aluminum mesh region is b2, and the width of the separator is d, where 2mm≤d-b1≤3mm and 3mm≤b1+b2-d≤3.5mm.

[0017] Optionally, the negative electrode tab is a nickel strip or a stainless steel strip.

[0018] Optionally, the negative electrode tab is riveted to the lithium strip.

[0019] Another objective of this invention is to provide a lithium manganese battery that can effectively reduce potential battery quality issues and improve battery performance.

[0020] A lithium-manganese battery is provided, wherein the lithium-manganese battery is manufactured using the above-described lithium-manganese battery processing method, and the lithium-manganese battery comprises:

[0021] A battery cell is formed by winding an overlapping first separator, a positive electrode plate, a second separator, and a lithium strip. The first aluminum mesh area of ​​the positive electrode plate is the positive tab of the battery cell, and the nickel strip or stainless steel strip disposed on the lithium strip is the negative tab of the battery cell.

[0022] The housing has an opening at only one end, through which the battery cell is placed inside the housing, and the negative electrode tab is welded to the housing.

[0023] A cover assembly with a sealing cover is provided at the opening. A metal mesh is provided on the side of the cover assembly facing the battery cell, and the metal mesh abuts against the positive electrode tab.

[0024] Optionally, the cover assembly includes a cover plate, a positive electrode post, a sealing element, and the metal mesh. The cover plate is provided with a mounting hole, one end of the positive electrode post passes through the mounting hole, the sealing element is sandwiched between the positive electrode post and the cover plate, and the metal mesh is welded to the other end of the positive electrode post away from the cover plate.

[0025] The beneficial effects of this invention are as follows:

[0026] The lithium manganese battery processing method proposed in this invention includes the following steps: S1, attaching powder to an aluminum mesh, and forming a positive electrode roll with regular stripes after lamination. The positive electrode roll has multiple aluminum mesh areas and multiple positive electrode areas spaced apart and in strip shape. The positive electrode areas contain powder, while the aluminum mesh areas do not. S2, cutting the positive electrode roll into multiple positive electrode sheets, each positive electrode sheet having a first aluminum mesh area and a first positive electrode sheet. S3, after drying, the positive electrode sheets are wound together with a separator and a lithium strip to form a battery cell. In the axial direction of the battery cell, the first positive electrode area extends beyond the lithium strip, and the first aluminum mesh area extends beyond the separator as the positive electrode tab of the battery cell. S4, installing the battery cell into a housing, welding the negative electrode tab on the lithium strip to the housing, and sealing the cover assembly at the opening of the housing. The metal mesh of the cover assembly abuts against the positive electrode tab.

[0027] This lithium-manganese battery processing method involves attaching powder to an aluminum mesh, forming multiple strip-shaped positive electrode regions on the mesh. These positive electrode regions are spaced apart to form multiple aluminum mesh regions without powder. The alternating strip-shaped aluminum mesh regions and positive electrode regions create a positive electrode roll with regular stripes. The positive electrode roll is then cut into multiple positive electrode sheets, each with a first aluminum mesh region and a first positive electrode region. After drying the positive electrode sheets, the positive electrode sheets, separator, and lithium strip are wound together to form a battery cell. The battery cell is then installed in a casing, with the first aluminum mesh region of the positive electrode sheet serving as the positive electrode tab, abutting against the metal mesh of the cover assembly. This full-tab structure using the first aluminum mesh region eliminates the complex processes of flattening, cutting, and laser welding required for full tabs in existing technologies, simplifying the operation and reducing safety hazards.

[0028] The lithium-manganese battery proposed in this invention is manufactured using the aforementioned lithium-manganese battery processing method. The lithium-manganese battery includes a cell, a casing, and a cover assembly. The cell is formed by winding an overlapping first separator, a positive electrode sheet, a second separator, and a lithium strip. The first aluminum mesh area of ​​the positive electrode sheet serves as the positive tab of the cell, and a nickel or stainless steel strip on the lithium strip serves as the negative tab. The casing has an opening at only one end, through which the cell is placed. The negative tab is welded to the casing. The cover assembly seals the opening, and a metal mesh is positioned on the side of the cover assembly facing the cell, abutting against the positive tab. This lithium-manganese battery uses a first aluminum mesh area to form a full tab structure, enabling the positive electrode to form a physical connection between the metal mesh and the metal mesh. This eliminates the complex processes of flattening, cutting, and laser welding required for full tabs in existing technologies. It also avoids the risk of separator deformation and micro-short circuits during flattening, which can lead to metal debris falling into the battery, reducing battery life, and in severe cases, causing short circuits and other safety issues. Attached Figure Description

[0029] Figure 1 This is a schematic flowchart of the lithium manganese battery processing method provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is a partial unfolded schematic diagram of the positive electrode roll material provided in Embodiment 1 of the present invention (irregular stripes before powder cleaning).

[0031] Figure 3 This is a partial unfolded schematic diagram of the positive electrode roll material provided in Embodiment 1 of the present invention (after cleaning, it has regular stripes).

[0032] Figure 4 This is a schematic diagram of the positive electrode sheet provided in Embodiment 1 of the present invention;

[0033] Figure 5 This is a partially unfolded schematic diagram of the battery cell provided in Embodiment 1 of the present invention;

[0034] Figure 6 This is a cross-sectional view of the cover assembly provided in Embodiment 2 of the present invention;

[0035] Figure 7 This is a cross-sectional view of the lithium manganese battery provided in Embodiment 2 of the present invention.

[0036] In the picture:

[0037] 1. Positive electrode plate; 11. First positive electrode region; 12. First aluminum mesh region;

[0038] 2. Lithium strip; 21. Negative electrode tab;

[0039] 3. First diaphragm;

[0040] 4. Second diaphragm;

[0041] 10. Positive electrode roll; 101. Second positive electrode region; 102. Second aluminum mesh region; 103. Third aluminum mesh region;

[0042] 20. Battery cell; 201. Positive electrode tab; 30. Housing; 40. Cover assembly; 401. Cover plate; 402. Positive electrode post; 403. Seal; 404. Metal mesh. Detailed Implementation

[0043] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0047] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0048] Example 1

[0049] like Figures 1 to 5 As shown, this embodiment provides a lithium manganese battery processing method, including the following steps: S1, attaching powder to an aluminum mesh, and forming a positive electrode roll 10 with regular stripes after lamination. The positive electrode roll 10 has multiple aluminum mesh areas and multiple positive electrode areas that are spaced apart and striped. The positive electrode areas contain powder, while the aluminum mesh areas do not contain powder; S2, cutting the positive electrode roll 10 into multiple positive electrode sheets 1, each positive electrode sheet 1 having a first aluminum mesh area 12 and a first positive electrode sheet 1. S3. After the positive electrode sheet 1 is dried, it is wound together with the separator and lithium strip 2 to form a battery cell 20. In the axial direction of the battery cell 20, the first positive electrode region 11 extends beyond the lithium strip 2, and the first aluminum mesh region 12 extends beyond the separator as the positive electrode tab 201 of the battery cell 20. S4. The battery cell 20 is installed into the housing 30. The negative electrode tab 21 provided on the lithium strip 2 is welded to the housing 30. The cover assembly 40 is sealed and pressed into the opening of the housing 30. The metal mesh 404 of the cover assembly 40 abuts against the positive electrode tab 201.

[0050] This lithium-manganese battery processing method involves attaching powder to an aluminum mesh to form multiple strip-shaped positive electrode regions. These positive electrode regions are spaced apart to form multiple aluminum mesh regions without powder. The aluminum mesh regions and positive electrode regions are spaced apart and are all strip-shaped, thus forming a positive electrode roll 10 with regular stripes. The positive electrode roll 10 is cut so that one positive electrode roll 10 can be cut into multiple positive electrode sheets 1, and each positive electrode sheet 1 has a first aluminum mesh region 12 and a first positive electrode region 11. After the positive electrode sheets 1 are dried, the positive electrode sheets 1, the separator, and the lithium strip 2 are wound together to form a battery cell 20. The battery cell 20 is installed in the housing 30, and the first aluminum mesh region 12 of the positive electrode sheet 1 serves as the positive electrode tab 201 of the battery cell 20, abutting against the metal mesh 404 of the cover assembly 40. The use of the first aluminum mesh area 12 to form a full tab structure allows the positive electrode of the battery to form a physical connection between the "metal mesh (first aluminum mesh area 12)" and the metal mesh 404. This eliminates the complex processes of flattening, cutting, and laser welding required for full tabs in existing technologies, simplifying the operation process and reducing safety hazards.

[0051] In this embodiment, the powder attached to the aluminum mesh is made by mixing manganese dioxide, graphite, carbon black, polytetrafluoroethylene, isopropanol, deionized water, etc. into a semi-dry material, and then preparing the semi-dry material into granular powder on a granulator. The ratio parameters of the semi-dry material can be configured according to the traditional positive electrode processing method of lithium manganese battery, and will not be described in detail here.

[0052] In this embodiment, after the cover assembly 40 is sealed and pressed into the opening of the housing 30, subsequent processes such as liquid injection, sealing, pre-discharge, and aging can be completed according to conventional procedures to form a lithium manganese battery.

[0053] Optionally, step S2 further includes attaching powder to an aluminum mesh. The edges of the strips formed by the powder on the aluminum mesh are not perfectly parallel straight lines. This causes the positive electrode roll 10 to initially exhibit an irregular stripe pattern after lamination. By removing excess powder through cleaning, the positive electrode roll 10 can then exhibit a regular stripe pattern. In specific implementation, when attaching granular powder to the aluminum mesh using a lithium manganese battery positive electrode lamination device, the powder is distributed in multiple spaced stripes on the aluminum mesh by controlling the feed port baffle, so that the positive electrode roll 10 after lamination has an irregular stripe pattern. Further, the positive electrode roll 10 after lamination is subjected to laser powder removal on a laser welding machine to make the positive electrode roll 10 exhibit a regular stripe pattern for subsequent preparation of the positive electrode sheet 1.

[0054] Optionally, the positive electrode roll 10 includes N+1 aluminum mesh areas and N positive electrode areas spaced apart, with both ends of the positive electrode roll 10 in the width direction being aluminum mesh areas. In a specific implementation, the aluminum mesh areas between two adjacent positive electrode areas are cut so that the positive electrode roll 10 with N+1 aluminum mesh areas and N positive electrode areas can form N positive electrode sheets 1 after cutting. One aluminum mesh area between two adjacent positive electrode areas is divided into two first aluminum mesh areas 12, and one first aluminum mesh area 12 is part of a positive electrode sheet 1. The two aluminum mesh areas located at both ends of the width direction of the positive electrode roll 10 do not need to be cut, and these aluminum mesh areas are directly used as part of a positive electrode sheet 1.

[0055] In this embodiment, to ensure that the dimensions of the multiple positive electrode sheets 1 formed by cutting the positive electrode roll 10 are consistent, N positive electrode regions are set as second positive electrode regions 101, and N aluminum mesh regions include N-1 second aluminum mesh regions 102 and 2 third aluminum mesh regions 103. The second aluminum mesh regions 102 are located between two adjacent second positive electrode regions 101, and the third aluminum mesh regions 103 are located at both ends of the width direction of the positive electrode roll 10. In addition, the dimensions of the positive electrode regions and aluminum mesh regions are set as follows: the width of the second positive electrode region 101 is a1, the width of the second aluminum mesh region 102 is a2, the width of the third aluminum mesh region 103 is a3, the width of the first positive electrode region 11 is b1, the width of the first aluminum mesh region 12 is b2, 2b1=a1, 2b2=a2=2a3. That is, the second positive electrode region 101 is cut, dividing each second positive electrode region 101 into two equal parts; the second aluminum mesh region 102 is cut, dividing each second aluminum mesh region 102 into two equal parts; and the third aluminum mesh region 103 does not need to be cut. Therefore, a positive electrode sheet 1 with N-1 second aluminum mesh regions 102, 2 third aluminum mesh regions 103, and N second positive electrode regions 101 can be cut to form 2N positive electrode sheets 1.

[0056] In this embodiment, along the axial direction of the cell 20, the width of the first positive electrode region 11 is b1, the width of the first aluminum mesh region 12 is b2, the width of the lithium strip 2 is c, and the width of the separator is d, where c < b1, b1 < d, and d < b1 + b2. The width of the first positive electrode region 11 is greater than the width of the lithium strip 2 to ensure that when the positive electrode sheet 1, the separator, and the lithium strip 2 are overlapped, the first positive electrode region 11 can completely cover the lithium strip 2, preventing burrs on the first aluminum mesh region 12 from piercing the separator and short-circuiting with the lithium strip 2. Furthermore, the width of the positive electrode sheet 1 is greater than the width of the separator to ensure that after the positive electrode sheet 1, the separator, and the lithium strip 2 are overlapped and wound to form the cell 20, the first aluminum mesh region 12 can extend beyond the separator and be exposed. Furthermore, the width of the separator is greater than the width of the first positive electrode region 11, so that when the positive electrode plate 1 and the separator are overlapped, both ends of the separator can extend beyond the first positive electrode region 11 by (d-b1) / 2.

[0057] Preferably, along the axial direction of the cell 20, the width of the first positive electrode region 11 is b1, the width of the first aluminum mesh region 12 is b2, and the width of the separator is d, where 2mm ≤ d - b1 ≤ 3mm, and 3mm ≤ b1 + b2 - d ≤ 3.5mm. Specifically, 2.5mm ≤ d - b1 ≤ 3mm; if d - b1 = 3mm, then the two ends of the separator extend 1.5mm beyond the first positive electrode region 11. Furthermore, 4.5mm ≤ b1 + b2 - d ≤ 5mm; if b1 + b2 - d = 5mm, then the first aluminum mesh region 12 extends 3.5mm beyond the edge of the separator. In this embodiment, along the axial direction of the cell 20, the width of the first positive electrode region 11 of the positive electrode sheet 1 is 25mm, the width of the first aluminum mesh region 12 is 5mm, the width of the lithium strip 2 is 24mm, and the width of the separator is 28mm. Thus, the two ends of the separator extend 1.5mm beyond the first positive electrode region 11, and the first aluminum mesh region 12 extends 3.5mm beyond the edge of the separator.

[0058] Optionally, the negative electrode tab 21 disposed on the lithium strip 2 is a nickel strip or a stainless steel strip. The material selection of the negative electrode tab 21 meets the requirements for chemical stability under low potential environments.

[0059] Optionally, the negative electrode tab 21 is riveted to the lithium strip 2. Compared with the welding process to connect the negative electrode tab 21 and the lithium strip 2, the riveting process has a lower operating temperature, will not melt the lithium strip 2, and can seal the pre-punched hole on the negative electrode tab 21 at the same time as riveting, ensuring the sealing of the connection.

[0060] Example 2

[0061] like Figure 6 and Figure 7As shown, this embodiment also provides a lithium-manganese battery, manufactured using the aforementioned lithium-manganese battery processing method. The lithium-manganese battery includes a cell 20, a casing 30, and a cover assembly 40. The cell 20 is formed by winding an overlapping first separator 3, a positive electrode 1, a second separator 4, and a lithium strip 2. The first aluminum mesh area 12 of the positive electrode 1 serves as the positive electrode tab 201 of the cell 20, and the nickel or stainless steel strip on the lithium strip 2 serves as the negative electrode tab 21 of the cell 20. The casing 30 has an opening at only one end, through which the cell 20 is placed. The negative electrode tab 21 is welded to the casing 30. The cover assembly 40 seals the opening, and a metal mesh 404 is provided on the side of the cover assembly 40 facing the cell 20, abutting against the positive electrode tab 201. This lithium-manganese battery uses a first aluminum mesh area 12 to form a full tab structure, so that the positive electrode of the battery forms a physical connection between the "metal mesh (first aluminum mesh area 12)" and the metal mesh 404. This eliminates the complex processes of flattening, cutting, and laser welding required for full tabs in existing technologies. It also avoids the risk of the separator deforming and causing a micro-short circuit in the battery during the flattening process, and the risk of metal debris falling into the battery, which can reduce the battery's lifespan and even cause safety problems such as short circuits in severe cases.

[0062] Optionally, such as Figure 6 As shown, the cover assembly 40 includes a cover plate 401, a positive electrode post 402, a sealing element 403, and a metal mesh 404. The cover plate 401 has mounting holes, and one end of the positive electrode post 402 passes through these holes. The sealing element 403 is sandwiched between the positive electrode post 402 and the cover plate 401. The metal mesh 404 is welded to the other end of the positive electrode post 402 facing away from the cover plate 401. The metal mesh 404 has a circular structure. It is welded onto the positive electrode post 402 with one side facing the battery cell 20. When the cover assembly 40 is pressed against the housing 30, the metal mesh 404 of the cover assembly 40 can physically contact and conduct with the first aluminum mesh area 12 of the battery cell 20. In this embodiment, the metal mesh 404 can be made of stainless steel or aluminum.

[0063] In the lithium-manganese battery provided in this embodiment, the aluminum mesh roll width is selected as 380mm. The feeding baffle in the film-forming setting divides the positive electrode powder into 6 regions, forming a second positive electrode region 101 with a width of 50mm to 55mm, while the width of the second aluminum mesh region 102 without powder is 10mm to 12mm, and the width of the third aluminum mesh region 103 on both sides is 5mm to 6mm. After film-forming, the positive electrode roll 10 is laser-cleaned on a laser welding machine, so that the positive electrode presents a regular stripe pattern. The width of each second positive electrode region 101 after cleaning is 50mm. The positive electrode roll 10 is slit and cut into a suitable specific model of positive electrode sheet 1. The cut positive electrode sheet 1 has two parts: a first aluminum mesh region 12 and a first positive electrode region 11, wherein the width of the first positive electrode region 11 is 25mm, and the width of the first aluminum mesh region 12 is 5mm. After the positive electrode sheet 1 is vacuum dried to remove moisture, it is wound together with the lithium strip 2, the first separator 3, and the second separator 4 on an automatic winding machine to form a battery cell 20. The lithium strip 2 has a width of 24 mm, and the first separator 3 and the second separator 4 are both 28 mm wide. The edges of the first separator 3 and the second separator 4 extend 1.5 mm beyond each end of the first positive electrode region 11 of the positive electrode sheet 1. After the entire battery cell 20 is wound, one end has a negative electrode tab 21, and the other end has a positive electrode tab 201 formed by the first aluminum mesh region 12 exposed 3 mm to 3.5 mm. After the wound battery cell 20 is installed in the casing and bottomed, the negative electrode tab 21 is welded to the bottom of the battery casing 30. The cover assembly 40 includes a circular metal mesh 404 that is welded and fixed, with the side of the metal mesh 404 facing down. The cover assembly 40 is pressed together with the battery casing 30, and the metal mesh 404 of the cover assembly 40 is in physical contact with the first aluminum mesh region 12 of the battery cell 20. Finally, by completing the subsequent processes such as liquid injection, sealing, pre-discharge, and aging according to conventional procedures, the lithium manganese battery of the present invention can be obtained.

[0064] Table 1 below shows a performance comparison between the lithium manganese CR123A battery of the present invention and the conventional lithium manganese CR123A battery (both with a nominal capacity of 1600mAh). It can be directly concluded from Table 1 that the performance of the lithium manganese CR123A battery of the present invention is superior to that of the conventional lithium manganese CR123A battery.

[0065] Table 1

[0066] Battery AC 1KHz impedance At 25℃, 3A continuous discharge to a capacity of 2.0V. At -40℃, it can continuously discharge at 100mA to a capacity of 2.0V. This invention CR123A 106mΩ 1107mAh 683mAh Domestic Brand A CR123A 267mΩ 568mAh 15.7mAh Domestic Brand B CR123A 235mΩ 894mAh 332mAh Japanese brand C CR123A 238mΩ 682mAh 524mAh American brand D CR123A 319mΩ 378mAh 0.2mAh

[0067] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method of processing lithium-manganese batteries, characterized in that, The method comprises the following steps: S1, attaching powder on the aluminum mesh to form a positive electrode roll material (10) with regular stripe shape after film combination, the positive electrode roll material (10) having a plurality of aluminum mesh areas and a plurality of positive electrode areas arranged at intervals in stripe shape, the positive electrode areas having powder, and the aluminum mesh areas not having powder; S2, cutting the positive electrode roll material (10) into a plurality of positive electrode sheets (1), each of the positive electrode sheets (1) having a first aluminum mesh area (12) and a first positive electrode area (11); S3, after drying the positive electrode sheet (1), co-winding the positive electrode sheet (1), a separator and a lithium strip (2) to form a battery cell (20), in the axial direction of the battery cell (20), the first positive electrode area (11) exceeds the lithium strip (2), and the first aluminum mesh area (12) exceeds the separator to serve as a positive electrode tab (201) of the battery cell (20); S4, assembling the battery cell (20) into a shell (30), welding a negative electrode tab (21) provided on the lithium strip (2) to the shell (30), and sealing and pressing a cover group (40) to an opening of the shell (30), and the metal mesh (404) of the cover group (40) abuts against the positive electrode tab (201).

2. The lithium manganese battery processing method of claim 1, wherein, Step S2 further comprises the following steps: attaching powder on the aluminum mesh, the powder on the aluminum mesh being in irregular stripe shape, and removing excess powder by powder cleaning to change the irregular stripe shape into regular stripe shape.

3. The lithium-manganese battery processing method of claim 1, wherein, The positive electrode roll material (10) comprises N+1 aluminum mesh areas and N positive electrode areas arranged at intervals, and both ends of the positive electrode roll material (10) in the width direction are the aluminum mesh areas.

4. The lithium-manganese battery processing method according to claim 3, wherein, The N positive electrode areas are second positive electrode areas (101), and the N+1 aluminum mesh areas comprise N-1 second aluminum mesh areas (102) and 2 third aluminum mesh areas (103), the second aluminum mesh areas (102) being located between two adjacent second positive electrode areas (101), and the third aluminum mesh areas (103) being located at both ends of the positive electrode roll material (10) in the width direction. The width of the second positive electrode area (101) is a1, the width of the second aluminum mesh area (102) is a2, the width of the third aluminum mesh area (103) is a3, the width of the first positive electrode area (11) is b1, and the width of the first aluminum mesh area (12) is b2, 2b1=a1, 2b2=a2=2a3.

5. The lithium-manganese battery processing method of claim 1, wherein, In the axial direction of the battery cell (20), the width of the first positive electrode area (11) is b1, the width of the first aluminum mesh area (12) is b2, the width of the lithium strip (2) is c, and the width of the separator is d, c 6. The lithium-manganese battery processing method of claim 5, wherein, In the axial direction of the battery cell (20), the width of the first positive electrode area (11) is b1, the width of the first aluminum mesh area (12) is b2, and the width of the separator is d, 2mm≤d-b1≤3mm, and 3mm≤b1+b2-d≤3.5mm.

7. The lithium-manganese battery processing method of claim 1, wherein, The negative electrode tab (21) is a nickel strip or a stainless steel strip.

8. The lithium-manganese battery processing method of claim 7, wherein, The negative electrode tab (21) is riveted on the lithium strip (2).

9. A lithium manganese battery characterised in that, The lithium-manganese battery is manufactured by the lithium-manganese battery processing method in any one of claims 1 to 8, and comprises: The electric core (20) is formed by winding the first diaphragm (3), the positive pole sheet (1), the second diaphragm (4) and the lithium strip (2) in an overlapped manner, the first aluminum mesh area (12) of the positive pole sheet (1) is the positive pole lug (201) of the electric core (20), and the nickel strip or the stainless steel strip arranged on the lithium strip (2) is the negative pole lug (21) of the electric core (20); The shell (30) has an opening at one end only, the electric core (20) is placed in the shell (30) through the opening, and the negative pole lug (21) is welded to the shell (30); The cover group (40) is provided with a metal mesh (404) on the side facing the electric core (20), and the metal mesh (404) abuts against the positive pole lug (201).

10. The lithium-manganese battery of claim 9, wherein, The cover group (40) comprises a cover plate (401), a positive pole column (402), a sealing element (403) and the metal mesh (404), the cover plate (401) is provided with a mounting hole, one end of the positive pole column (402) is arranged in the mounting hole, the sealing element (403) is clamped between the positive pole column (402) and the cover plate (401), and the metal mesh (404) is welded to the other end of the positive pole column (402) away from the cover plate (401).

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