CN111162288A - Process for manufacturing lithium-manganese button cell by dry method, production line and application - Google Patents
Process for manufacturing lithium-manganese button cell by dry method, production line and application Download PDFInfo
- Publication number
- CN111162288A CN111162288A CN202010051655.7A CN202010051655A CN111162288A CN 111162288 A CN111162288 A CN 111162288A CN 202010051655 A CN202010051655 A CN 202010051655A CN 111162288 A CN111162288 A CN 111162288A
- Authority
- CN
- China
- Prior art keywords
- electrolyte
- lithium
- negative electrode
- shell
- diaphragm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/04—Cells with aqueous electrolyte
- H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
- H01M6/10—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with wound or folded electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Primary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a process for manufacturing a lithium-manganese button cell by a dry method, a production line and application, wherein the process flow comprises the following steps: preparing a negative electrode shell → filling a lithium sheet → inserting a diaphragm → injecting electrolyte for the first time → inserting a positive electrode sheet → injecting electrolyte for the second time → filling a positive electrode cover → sealing. The invention realizes the process of manufacturing the lithium-manganese button cell by the dry method by respectively injecting the electrolyte before and after inserting the positive electrode cover and reasonably controlling the amount of the electrolyte injected twice, avoids all troubles caused by soaking the positive electrode plate outside the shell, and ensures that the discharge performance of the cell manufactured by the process of manufacturing the lithium-manganese button cell by the dry method is equivalent to that of the cell manufactured by the existing wet method, meanwhile, the production efficiency is high, and unnecessary waste is avoided.
Description
Technical Field
The invention belongs to the field of lithium manganese button cell production, and particularly relates to a process for manufacturing a lithium manganese button cell by a dry method, a production line and application.
Background
Lithium manganese button cells are increasingly used and demanded in industrial and daily life products. The application fields of lithium-manganese button cells are more and more extensive from medical military equipment to computers, automobile industry, power grid industry, various electronic products and the like.
The existing lithium manganese button cell automatic production line generally comprises: the production line comprises a negative electrode shell feeding machine → a lithium sheet shell feeding device → a diaphragm shell feeding machine → a positive electrode sheet shell feeding device → positive electrode cover mounting equipment → a sealing machine, and the production line corresponds to the following process flows: placing the cathode casing (with the sealing ring nested on the opening edge of the cathode casing) with the opening facing upward at the position to be processed → placing the lithium sheet inside the cathode casing → placing the cylindrical diaphragm with only the upper end open on the lithium sheet → inserting the anode sheet soaked with the electrolyte into the diaphragm → placing the anode cap opening facing downward outside the cathode casing and the sealing ring → sealing, wherein the step of inserting the anode sheet soaked with the electrolyte into the diaphragm is usually: thousands of dry manganese sheets are placed into a large container filled with electrolyte together for normal-pressure soaking or vacuum soaking, so that the positive plates can fully absorb the electrolyte, however, in order to ensure that all the positive plates can fully absorb the electrolyte, the positive plates are usually soaked for more than twenty hours under normal pressure or for more than ten hours under vacuum, and then the wet positive plates soaked with the electrolyte are inserted into the diaphragm. The existing process for manufacturing the lithium-manganese button cell by the wet method has a plurality of defects: the electrolyte is long in soaking time, the electrolyte is seriously volatilized and wasted in the soaking process, the manufacturing cost of the battery is high, the electrolyte belongs to an inflammable product, and a large amount of electrolyte is intensively placed for a long time to cause the fire hidden danger; secondly, the waste electrolyte soaked in the positive plate is discharged to seriously pollute the environment; and thirdly, the wet positive plate has longer waiting time in the process of adding the negative electrode shell, the wet plate is exposed for a long time, and electrolyte in the wet plate is volatilized to influence the performance of the battery.
Chinese patent with application publication number CN102629697A discloses a production process for preparing button cell by dry method, which comprises the following steps: (1) placing the opening of the positive electrode cover upwards at a position to be processed; (2) fixing the positive electrode ring in the positive electrode cover; (3) placing the positive plate into the positive ring and compacting; (4) adding electrolyte into the positive electrode cover; (5) moving the assembly filled with the electrolyte into a vacuum box to perform vacuum soaking on the positive plate; (6) assembling a separator on the positive electrode sheet; (7) and (4) opening the negative electrode cover filled with the negative electrode lithium, completely filling all the battery components into the positive electrode cover, and then sealing to finish battery assembly. However, in the assembly method based on the positive electrode cap, all battery modules are put into the positive electrode cap, and then the sealing is performed to complete the battery assembly, so that the existing wet process line equipment based on the negative electrode can needs to be replaced completely, and the input cost is huge.
Disclosure of Invention
One of the objectives of the present invention is to provide a dry process for manufacturing a lithium manganese button cell, which improves the existing wet process for manufacturing a lithium manganese button cell based on a negative electrode case, so as to overcome all the defects of the existing wet process for manufacturing the lithium manganese button cell, and improve the manufacturing efficiency of the cell.
A process for manufacturing a lithium-manganese button cell by a dry method comprises the following process flows:
1) preparing a negative electrode shell: placing the opening of the negative electrode shell upwards at a position to be processed, and nesting a sealing ring on the edge of the opening of the negative electrode shell;
2) loading a lithium sheet: a lithium sheet is filled in the negative electrode shell;
3) inserting a diaphragm: inserting a cylindrical separator having only an upper end opening into the negative electrode can;
4) injecting electrolyte for the first time: injecting electrolyte into the diaphragm in the negative electrode shell, wherein the minimum addition amount of the electrolyte is limited by the minimum amount of the electrolyte required by the positive electrode plate and the diaphragm to absorb the electrolyte to a saturated state, and the maximum addition amount of the electrolyte is limited by the fact that the electrolyte cannot overflow when the positive electrode plate is inserted, and the electrolyte is injected at one time in the step;
5) inserting a positive plate: directly inserting the dried positive plate into the electrolyte in the diaphragm;
6) and (3) secondary electrolyte injection: dropwise adding electrolyte to the upper surface of the positive plate in the negative shell, wherein the maximum addition amount is limited by immediately performing a step of installing a positive cover after the step of injecting the electrolyte for the second time and preventing the electrolyte from overflowing when the positive cover, the sealing ring and the negative shell are tightly pressed and sealed, and the electrolyte is dropwise added in one step in the step;
7) installing an anode cover: sleeving the anode cover with an opening downward outside the cathode shell and the sealing ring, and standing for more than 10 min;
8) and (3) sealing: and bending the opening edge of the positive electrode cover inwards to compress and seal the positive electrode cover, the sealing ring and the negative electrode shell to obtain the lithium-manganese button cell.
In the invention, the dry positive plate is directly inserted into the diaphragm in the negative electrode shell in the step of inserting the positive plate, meanwhile, if the step of injecting the electrolyte is performed after the step of inserting the positive plate and before the step of installing the positive cover according to the prior art (Chinese patent application publication No. CN 102629697A), because the electrolyte injector adds the electrolyte into the negative electrode shell from the central position right above the negative electrode shell, the electrolyte is directly dripped on the upper surface of the positive plate and is absorbed by unidirectional permeation from top to bottom, in order to avoid splashing of the electrolyte, the adding amount of the electrolyte injected at one time cannot be too large, and when the content of the electrolyte is not enough to fully suck the positive plate and the diaphragm, the content of the electrolyte at each height position of the positive plate is not uniform, but the electrolyte on the diaphragm is not enough, the discharge performance of the battery is seriously influenced; and limited by the liquid suction speed of the positive plate, the positive plate still needs to stand for more than 40min after liquid injection, so that the electrolyte on the upper surface of the positive plate is diffused downwards, the electrolyte on the upper part of the positive plate is prevented from overflowing when the positive cover is mounted in an oversaturated manner, the next steps of mounting the positive cover and sealing can be carried out, and the manufacturing time is long.
The method comprises the steps of injecting the electrolyte for the first time before the positive electrode cover is inserted, injecting the electrolyte for the second time after the positive electrode cover is inserted, taking the step of injecting the electrolyte for the first time as the main supplement of the electrolyte, and obtaining the following results through experiments and empirical calculation by the applicant: the minimum amount of electrolyte required by the positive plate and the diaphragm to absorb the electrolyte to the saturation state is necessarily less than the non-overflow amount of the electrolyte during the primary electrolyte injection, so the minimum addition amount of the electrolyte is limited by the minimum amount of electrolyte required by the positive plate and the diaphragm to absorb the electrolyte to the saturation state, the maximum addition amount of the electrolyte is limited by the fact that the electrolyte cannot overflow when the positive plate is inserted, meanwhile, the secondary electrolyte injection step is used as a small amount of complement of the electrolyte, the two electrolyte injection steps are mutually matched, the process for manufacturing the lithium-manganese button cell by the dry method is realized, all troubles caused by soaking the positive plate outside the shell are avoided, in addition, the discharge performance of the cell manufactured by the dry method lithium-manganese button cell process is equivalent to that of the existing wet method lithium-manganese button cell, and simultaneously, the primary electrolyte injection step and the secondary electrolyte injection step of the invention are all completed at, avoid twice annotating the wait between the liquid, also avoid annotating electrolyte and adorning the positive plate and seal the wait between to the equal comprehensive electrolyte of contact of positive plate upper and lower surface, the positive plate can be quicker, more even absorption electrolyte, production efficiency is high. In addition, the manufacturing process is obtained by modifying the existing wet-process lithium manganese button cell manufacturing process, and can reserve the original wet-process lithium manganese button cell manufacturing production line as much as possible, thereby avoiding unnecessary waste.
Preferably, when the CR2032 lithium-manganese button cell is manufactured, the addition amount of the electrolyte in the step of injecting the electrolyte for the first time is 200-280 mg, and the addition amount of the electrolyte in the step of injecting the electrolyte for the second time is 40-100 mg, so that the overflow caused by the excessive addition amount of the electrolyte in the step of injecting the electrolyte for the first time when the positive plate is inserted can be effectively avoided; meanwhile, the adding amount of the electrolyte is controlled to be below 100mg in the secondary electrolyte injection step, so that the steps of installing the positive electrode cover and sealing are sequentially carried out immediately after the secondary electrolyte injection step, the overflow phenomenon in the sealing process is avoided, the electrolyte is effectively saved, the pollution is avoided, and compared with the manufacturing process of injecting the electrolyte once, the adding amount of the electrolyte can be increased, and the performance of the battery is effectively improved. Furthermore, when the CR2032 lithium-manganese button cell is manufactured, the total injection amount of the electrolyte in the primary electrolyte injection step and the secondary electrolyte injection step is controlled to be 280-300 mg, and at the moment, the large-current discharge effect of the manufactured CR2032 lithium-manganese button cell is better.
The invention also aims to provide a lithium-manganese button cell prepared by adopting the process for preparing the lithium-manganese button cell by adopting the dry method, which comprises a groove barrel-shaped negative electrode shell, a positive electrode plate and a positive electrode cover, wherein the bottom of the inner side of the negative electrode shell is provided with the lithium plate, the lithium plate is provided with a cylindrical diaphragm only with an opening at the upper end, a gap is formed between the side wall of the diaphragm and the side wall of the negative electrode shell, the positive electrode plate is embedded in a diaphragm cylinder, the positive electrode cover is buckled above the positive electrode plate and covers the edge of the top of the negative electrode shell, and further extends downwards to the outer side of the edge to form a gap with the edge of the negative electrode shell and the side wall, a sealing ring is used for filling the gap between the diaphragm and the negative electrode shell, and the inner end of the sealing ring extends downwards to the; the position of the side wall of the negative electrode shell below the inner end of the sealing ring is inwards shrunk to form a step structure, a gap is also reserved between the step surface of the step structure and the inner end surface of the sealing ring, and the outer side wall of the diaphragm is also seamlessly attached to the inner side wall of the negative electrode shell below the step structure and above the lithium sheet, so that an annular cavity for storing electrolyte is formed among the negative electrode shell, the diaphragm and the sealing ring. The process for manufacturing the lithium-manganese button cell by the dry method is matched with the structure of the lithium-manganese button cell, so that the performance of the cell can be further improved.
The production line comprises a negative electrode shell feeding machine, a lithium sheet shell feeding device, a diaphragm shell feeding machine, a first electrolyte injection machine, a positive electrode sheet shell feeding device, a second electrolyte injection machine, positive electrode cover mounting equipment and sealing machine equipment which are sequentially arranged along the direction of the production line, wherein adjacent equipment are connected through a negative electrode shell conveying device to realize forward conveying of the negative electrode shell along the direction of the production line.
Drawings
FIG. 1 is a schematic structural diagram of a production line for dry-process production of lithium manganese button cells according to the present invention;
fig. 2 is a cross-sectional structural view of the lithium manganese button cell prepared in embodiments 1 to 5;
FIG. 3 is a cross-sectional view of the lithium manganese button cell fabricated in example 6;
fig. 4 is a sectional view of the lithium manganese button cell manufactured in example 6 along the line a-a of fig. 3.
Detailed Description
Embodiments of the invention will now be described in detail:
with reference to fig. 1 and 2, a process for manufacturing a lithium manganese button cell by a dry method comprises the following process flows:
1) negative electrode can 10 is prepared: placing the opening of the negative electrode shell 10 upwards at a position to be processed, and nesting a sealing ring 70 on the edge of the opening of the negative electrode shell 10;
2) and (3) loading a lithium sheet 40: a lithium sheet 40 is filled in the negative electrode can 10;
3) insertion of the septum 60: a cylindrical separator 60 having only an upper end open is inserted into the negative electrode can 10;
4) injecting electrolyte for the first time: injecting electrolyte into the diaphragm 60 in the negative electrode shell 10, wherein the minimum addition amount of the electrolyte is limited by the minimum amount of the electrolyte required by the positive electrode plate 20 and the diaphragm 60 to absorb the electrolyte to a saturated state, the maximum addition amount of the electrolyte is limited by the fact that the electrolyte cannot overflow when the positive electrode plate 20 is inserted, and the electrolyte is injected at one time;
5) insertion of positive electrode sheet 20: inserting the dried positive electrode sheet 20 directly into the electrolyte in the separator 60;
6) and (3) secondary electrolyte injection: dropwise adding electrolyte on the upper surface of the positive plate 20 in the negative electrode shell 10, wherein the maximum addition amount of the electrolyte is limited by that the electrolyte does not overflow when the positive electrode cover 40 is immediately mounted and the positive electrode cover 40, the sealing ring 70 and the negative electrode shell 10 are tightly pressed and sealed after the step of injecting the electrolyte for the second time, and the electrolyte is dropwise added in one step in the step;
7) charging electrode cover 40: the anode cover 40 is sleeved outside the cathode shell 10 and the sealing ring 70 with an opening facing downwards and is kept stand for more than 10 min;
8) and (3) sealing: and bending the opening edge of the positive electrode cover 40 inwards to compress and seal the positive electrode cover 40, the sealing ring 70 and the negative electrode shell 10 to obtain the lithium-manganese button cell.
Preferably, when the CR2032 lithium-manganese button cell is manufactured, the addition amount of the electrolyte in the step of injecting the electrolyte for the first time is 200-280 mg, and the addition amount of the electrolyte in the step of injecting the electrolyte for the second time is 40-100 mg, so that the overflow caused by the excessive addition amount of the electrolyte in the step of injecting the electrolyte for the first time when the positive plate 20 is inserted can be effectively avoided; meanwhile, the adding amount of the electrolyte in the step of injecting the electrolyte for the second time is controlled to be below 100mg, so that the steps of installing the positive electrode cover 40 and sealing are sequentially carried out immediately after the step of injecting the electrolyte for the second time, the phenomenon of liquid overflow in the sealing process is avoided, the electrolyte is effectively saved, pollution is avoided, and compared with the manufacturing process of injecting the electrolyte for the first time, the adding amount of the electrolyte can be increased, and the performance of the battery is effectively improved. Furthermore, when the CR2032 lithium-manganese button cell is manufactured, the total injection amount of the electrolyte in the primary electrolyte injection step and the secondary electrolyte injection step is controlled to be 280-300 mg, and at the moment, the large-current discharge effect of the manufactured CR2032 lithium-manganese button cell is better.
As shown in fig. 1, a production line for manufacturing lithium manganese button cells by a dry method is specially used for implementing the above-mentioned process for manufacturing lithium manganese button cells by a dry method, and includes a negative electrode casing feeding machine 100, a lithium sheet casing entering device 200, a diaphragm casing entering device 300, a first electrolyte injection machine 400, a positive electrode sheet casing entering device 500, a second electrolyte injection machine 600, a positive electrode cover installation device 700, and a sealing machine 800, which are sequentially arranged along the production line direction, and adjacent devices are connected by a negative electrode casing conveying device (conventional structure, not shown) to realize forward conveying of the negative electrode casing along the production line direction.
To better illustrate the invention, the following description is made in conjunction with examples and comparative examples directed to CR2032 lithium manganese button cells.
TABLE 1
With reference to fig. 1 and fig. 2, the lithium manganese button cell structures prepared in examples 1 to 5 and comparative examples 1 to 7 are all as follows: including groove tubbiness negative pole shell 10, positive plate 20 and anodal lid 30, lithium piece 40 is installed to the inboard bottom of negative pole shell 10, places only upper end open-ended cylindric diaphragm 60 on the lithium piece 40 again, has the space between diaphragm 60 lateral wall and the negative pole shell 10 lateral wall, and positive plate 20 inlays in diaphragm 60 section of thick bamboo again, anodal lid 30 lock in positive plate 20 top and cover the top border of negative pole shell 10 and further all form the space to all between the border and the lateral wall of border outside, downwardly extending and negative pole shell, and a sealing washer 70 fills up the space between diaphragm 60, negative pole shell 10, anodal lid 30 three.
In addition, in examples 1 to 5 and comparative examples 1 to 7, the opening of the positive electrode cover is downwards sleeved on the negative electrode shell, and the positive electrode cover and the negative electrode shell are both kept still for 10min and then sealed. The batteries prepared in each example and each comparative example are divided into two groups, each group contains at least 10 batteries, and one group adopts 1K constant resistance discharge (the discharge cut-off voltage is 2.0V) and is subjected to discharge performance test in an environment of 23 +/-2 ℃; the other group adopts 10mA constant current discharge (5 s-on/55s-off, cut-off voltage is 1.8V), and the discharge performance is tested in the environment of 23 +/-2 ℃. Table 2 below is an average of the discharge time data.
TABLE 2
| Discharge time under 1K constant resistance discharge conditions (h） | Discharge time (h) under 10mA constant current discharge condition | Total time (min) required for electrolyte injection and electrolyte absorption | |
| Example 1 | 85.6 | 21.8 | 10 |
| Example 2 | 85.7 | 21.9 | 10 |
| Example 3 | 85.7 | 22.0 | 10 |
| Example 4 | 85.6 | 21.9 | 10 |
| Example 5 | 85.5 | 21.6 | 10 |
| Comparative example 1 | 85.2 | 21.6 | 16h |
| Comparative example 2 | 82.6 | 19.8 | 40 |
| Comparative example 3 | 79.5 | 19.2 | 10 |
| Comparative example 4 | 80.3 | 20.0 | 10 |
| Comparative example 5 | 84.5 | 20.8 | 10 |
| Comparative example 6 | 84.3 | 20.5 | 10 |
| Comparative example 7 | 82.5 | 19.9 | 10 |
In view of the fact that the electrolyte injection machine is used for one-time injection, the time is very short and is ignored.
As can be seen from the data of examples 1 to 5 and comparative example 1 in tables 1 and 2: the discharge performance of the CR2032 lithium-manganese button cell prepared by the dry-method lithium-manganese button cell manufacturing process under the conditions of 1K constant resistance discharge and 10mA constant current discharge is equivalent to that of the existing wet-method lithium-manganese button cell. As can be seen from the data for comparative example 2 in tables 1 and 2: when the battery is prepared by adopting the dry method of the cathode shell assembly process, if the electrolyte is injected only after the anode plate 20 is inserted, in order to avoid splashing of the electrolyte, the addition amount of the electrolyte can be only 220mg at most, and the standing is required for 40min after the injection is limited by the liquid absorption speed of the anode plate 20, so that the electrolyte on the upper surface of the anode plate 20 is diffused downwards, the overflow caused when the anode cover 30 is mounted in the supersaturation manner of the electrolyte on the upper part of the anode plate 20 is avoided, and then the next steps of mounting the anode cover 30 and sealing can be carried out, therefore, the total time required by the electrolyte injection and the electrolyte absorption in the process is longer (40 min), the production efficiency is low, and the discharge performance of the prepared CR2032 lithium manganese button battery under the conditions of 1K constant resistance discharge and 10mA constant current discharge is not equal to that. As can be seen from the data for comparative example 3 in tables 1 and 2: when the battery is prepared by adopting the cathode shell assembly process in a dry method, if the step of injecting the electrolyte is only carried out for one time and the step of injecting the electrolyte is not carried out for the second time, the discharge performance of the prepared CR2032 lithium-manganese button battery is reduced under the conditions of 1K constant resistance discharge and 10mA constant current discharge, and the discharge level of the existing wet-method prepared lithium-manganese button battery cannot be reached. As can be seen from the data for comparative examples 4-7 in tables 1 and 2: when the addition amount of the electrolyte in the step of injecting the electrolyte for the first time is less than 200mg or the addition amount of the electrolyte in the step of injecting the electrolyte for the second time is less than 40mg, other conditions meet the process of the invention, and the discharge performance of the prepared CR2032 lithium-manganese button cell under the conditions of 1K constant resistance discharge and 10mA constant current discharge still cannot reach the discharge level of the existing wet-process prepared lithium-manganese button cell.
In addition, the applicant also provides example 6, the CR2032 lithium manganese button cell prepared in example 6 is obtained by applying the dry process for preparing lithium manganese button cell of the above example 3 and further modifying the cell structure, and the CR2032 lithium manganese button cell prepared in example 6 is different from example 3 in the following points, in combination with fig. 3 and 4: a seal ring 70 fills the gap between the separator 60 and the negative electrode can 10, and the inner end of the seal ring 70 extends downwards towards the inner side of the edge of the negative electrode can 10 and seals the upper end of the gap between the separator 60 and the negative electrode can 10; the side wall of the negative electrode shell 10 below the inner end of the sealing ring 70 is inwardly contracted to form a stepped structure 12, a gap is also reserved between the stepped surface 121 of the stepped structure 12 and the inner end surface 71 of the sealing ring 70, and the outer side wall of the diaphragm 60 is also seamlessly attached to the inner side wall of the negative electrode shell 10 below the stepped structure 12 and above the lithium sheet 40, so that an annular cavity 80 for storing electrolyte is formed among the negative electrode shell 10, the diaphragm 60 and the sealing ring 70. The batteries prepared in the embodiment 6 are equally divided into two groups, each group at least comprises 10 batteries, and one group adopts 1K constant resistance discharge (the discharge cut-off voltage is 2.0V) and performs a discharge performance test in an environment of 23 +/-2 ℃; the other group adopts 10mA constant current discharge (5 s-on/55s-off, cut-off voltage is 1.8V), and the discharge performance is tested in the environment of 23 +/-2 ℃. The performance of CR2032 lithium manganese button cells prepared in example 3 and example 6 were compared as shown in table 3 below:
TABLE 3
| Discharge time (h) under 1K constant resistance discharge conditions | Discharge time (h) under 10mA constant current discharge condition | |
| Example 3 | 85.7 | 21.9 |
| Example 6 | 86.9 | 22.2 |
As can be seen from table 3: in embodiment 6, the process for manufacturing a lithium manganese button cell by a dry method of the present invention is used in combination with a specific lithium manganese button cell structure, so as to further improve the performance of the cell.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications should also fall into the protection scope of the present invention.
Claims (5)
1. A process for manufacturing a lithium-manganese button cell by a dry method is characterized by comprising the following process flows:
1) preparing a negative electrode shell: placing the opening of the negative electrode shell upwards at a position to be processed, and nesting a sealing ring on the edge of the opening of the negative electrode shell;
2) loading a lithium sheet: a lithium sheet is filled in the negative electrode shell;
3) inserting a diaphragm: inserting a cylindrical separator having only an upper end opening into the negative electrode can;
4) injecting electrolyte for the first time: injecting electrolyte into the diaphragm in the negative electrode shell, wherein the minimum addition amount of the electrolyte is limited by the minimum amount of the electrolyte required by the positive electrode plate and the diaphragm to absorb the electrolyte to a saturated state, and the maximum addition amount of the electrolyte is limited by the fact that the electrolyte cannot overflow when the positive electrode plate is inserted, and the electrolyte is injected at one time in the step;
5) inserting a positive plate: directly inserting the dried positive plate into the electrolyte in the diaphragm;
6) and (3) secondary electrolyte injection: dropwise adding electrolyte to the upper surface of the positive plate in the negative shell, wherein the maximum addition amount is limited by immediately performing a step of installing a positive cover after the step of injecting the electrolyte for the second time and preventing the electrolyte from overflowing when the positive cover, the sealing ring and the negative shell are tightly pressed and sealed, and the electrolyte is dropwise added in one step in the step;
7) installing an anode cover: sleeving the anode cover with an opening downward outside the cathode shell and the sealing ring, and standing for more than 10 min;
8) and (3) sealing: and bending the opening edge of the positive electrode cover inwards to compress and seal the positive electrode cover, the sealing ring and the negative electrode shell to obtain the lithium-manganese button cell.
2. The process for manufacturing lithium manganese button cells by dry method according to claim 1, wherein the process comprises the following steps: when the CR2032 lithium-manganese button cell is manufactured, the addition amount of the electrolyte in the step of injecting the electrolyte for the first time is 200-280 mg, and the addition amount of the electrolyte in the step of injecting the electrolyte for the second time is 40-100 mg.
3. The process for manufacturing lithium manganese button cells by the dry method according to claim 2, wherein the dry method comprises the following steps: when the CR2032 lithium-manganese button cell is manufactured, the total injection amount of the electrolyte in the primary electrolyte injection step and the secondary electrolyte injection step is controlled to be 280-300 mg.
4. The lithium-manganese button cell prepared by adopting the process for preparing the lithium-manganese button cell by the dry method as claimed in any one of claims 1 to 3, which comprises a tub-shaped negative electrode shell, a positive electrode plate and a positive electrode cover, wherein the bottom of the inner side of the negative electrode shell is provided with the lithium plate, the lithium plate is provided with a cylindrical diaphragm only with an opening at the upper end, a gap is formed between the side wall of the diaphragm and the side wall of the negative electrode shell, the positive electrode plate is embedded in the diaphragm cylinder, the positive electrode cover is buckled above the positive electrode plate and covers the top edge of the negative electrode shell, and further extends outwards and downwards to form gaps with the edge and the side wall of the negative electrode shell, a sealing ring fills the gap between the diaphragm and the negative electrode shell, and the inner end of the sealing ring extends inwards and downwards to the edge of the negative electrode shell and seals the upper; the position of the side wall of the negative electrode shell below the inner end of the sealing ring is inwards shrunk to form a step structure, a gap is also reserved between the step surface of the step structure and the inner end surface of the sealing ring, and the outer side wall of the diaphragm is also seamlessly attached to the inner side wall of the negative electrode shell below the step structure and above the lithium sheet, so that an annular cavity for storing electrolyte is formed among the negative electrode shell, the diaphragm and the sealing ring.
5. A production line for manufacturing lithium-manganese button cells by a dry method is specially used for implementing the process for manufacturing lithium-manganese button cells by the dry method as claimed in any one of claims 1 to 3, and comprises a negative electrode shell feeding machine, a lithium piece shell feeding device, a diaphragm shell feeding machine, a first electrolyte injection machine, a positive electrode piece shell feeding device, a second electrolyte injection machine, a positive electrode cover mounting device and a sealing machine which are sequentially arranged along the direction of the production line, wherein the adjacent devices are connected through a negative electrode shell conveying device to realize forward conveying of a negative electrode shell along the direction of the production line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010051655.7A CN111162288A (en) | 2020-01-17 | 2020-01-17 | Process for manufacturing lithium-manganese button cell by dry method, production line and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010051655.7A CN111162288A (en) | 2020-01-17 | 2020-01-17 | Process for manufacturing lithium-manganese button cell by dry method, production line and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111162288A true CN111162288A (en) | 2020-05-15 |
Family
ID=70564082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010051655.7A Pending CN111162288A (en) | 2020-01-17 | 2020-01-17 | Process for manufacturing lithium-manganese button cell by dry method, production line and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111162288A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112151741A (en) * | 2020-09-14 | 2020-12-29 | 常州纽捷电池科技有限公司 | Online battery sheet-making and assembling process |
| CN112886107A (en) * | 2020-12-31 | 2021-06-01 | 天津国安盟固利新材料科技股份有限公司 | Optimized button cell assembling method |
| CN113540483A (en) * | 2021-07-19 | 2021-10-22 | 宜昌力佳科技有限公司 | Battery assembly method with on-line sheet-making molding rapid permeation imbibition |
-
2020
- 2020-01-17 CN CN202010051655.7A patent/CN111162288A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112151741A (en) * | 2020-09-14 | 2020-12-29 | 常州纽捷电池科技有限公司 | Online battery sheet-making and assembling process |
| CN112886107A (en) * | 2020-12-31 | 2021-06-01 | 天津国安盟固利新材料科技股份有限公司 | Optimized button cell assembling method |
| CN112886107B (en) * | 2020-12-31 | 2022-08-26 | 天津国安盟固利新材料科技股份有限公司 | Optimized button cell assembling method |
| CN113540483A (en) * | 2021-07-19 | 2021-10-22 | 宜昌力佳科技有限公司 | Battery assembly method with on-line sheet-making molding rapid permeation imbibition |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111162288A (en) | Process for manufacturing lithium-manganese button cell by dry method, production line and application | |
| CN104064717B (en) | A kind of lead-acid accumulator and apply the electric motor car of this accumulator | |
| CN1314139C (en) | Secondary cell including improved cover component and plug for secondary cell | |
| CN102959763A (en) | Separator for lead acid battery | |
| CN208848999U (en) | Plastic cement part flow arrangement under a kind of lithium battery structure part | |
| CN110718669A (en) | Manufacturing process of soft package lithium ion battery | |
| CN106133951A (en) | For manufacturing method and the secondary cell of secondary cell | |
| CN210984855U (en) | Production line for manufacturing lithium-manganese button cell by dry method | |
| CN105655505A (en) | Maintainable cylindrical lithium-ion battery | |
| EP3748761A1 (en) | Bipolar lead acid storage battery | |
| CN103296318A (en) | Lead-acid storage battery quantitative closed intermittent container formation device and process | |
| CN204156031U (en) | With the flexible packing lithium ion battery of liquid capsule and fixation device | |
| CN1879248A (en) | A gasket, a bipolar battery and a method for manufacturing a bipolar battery with such a gasket | |
| CN210200770U (en) | Secondary battery top cap with exhausting and liquid supplementing functions | |
| CN208315622U (en) | A kind of start stop system AGM battery exhaust structure | |
| CN205385084U (en) | Heat dissipation type lead -acid accumulator | |
| KR101775341B1 (en) | Lead acid battery | |
| CN201289884Y (en) | Acid mist filtering acid receiver for charging 6-DGA-120 accumulator | |
| CN203589165U (en) | Bipolar lead-acid storage battery with high efficiency | |
| JPH0373988B2 (en) | ||
| CN203026562U (en) | Storage battery liquid injection hole cover plate and storage battery cover | |
| CN204464330U (en) | A kind of Plumbic acid accumulator container lid reducing acid mist pollution | |
| CN202076387U (en) | Dynamic zinc-air battery | |
| CN212062480U (en) | Alkaline battery with liquid leakage treatment capacity | |
| CN207265111U (en) | A kind of lead-acid battery lid of high intensity acid-proof overflow |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |