CN118054096A - Production method for improving capacity of steel shell cylindrical lithium battery - Google Patents
Production method for improving capacity of steel shell cylindrical lithium battery Download PDFInfo
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- CN118054096A CN118054096A CN202410213112.9A CN202410213112A CN118054096A CN 118054096 A CN118054096 A CN 118054096A CN 202410213112 A CN202410213112 A CN 202410213112A CN 118054096 A CN118054096 A CN 118054096A
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- battery
- diaphragm
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- vacuum
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000007906 compression Methods 0.000 claims abstract description 17
- 230000006835 compression Effects 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims description 12
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 claims description 3
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 3
- BDKWOJYFHXPPPT-UHFFFAOYSA-N lithium dioxido(dioxo)manganese nickel(2+) Chemical compound [Mn](=O)(=O)([O-])[O-].[Ni+2].[Li+] BDKWOJYFHXPPPT-UHFFFAOYSA-N 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 3
- 230000001276 controlling effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 238000005086 pumping Methods 0.000 claims 1
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- Primary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to the technical field of lithium ion batteries, and relates to a production method for improving the capacity of a steel shell cylindrical lithium battery. According to the production method for improving the capacity of the steel shell cylindrical lithium battery, before the lithium battery pole piece and the diaphragm are wound, the diaphragm is sent into a vacuum rolling mechanism for rolling, a compression roller of the vacuum rolling mechanism is made of plastic, the pressure is designed to be 0.05-0.2 MPa, the vacuum rolling mechanism is vacuumized, then the diaphragm is flattened by the compression roller, and the thickness compression rate of the diaphragm can be controlled to be 10-20%; the pole piece and the diaphragm are wound around the battery core, then baked, the baking temperature of the battery core is 80-90 ℃, and the baking environment is vacuumized. The lithium battery separator is sent to a vacuum rolling mechanism for rolling before being wound, the battery core is compressible in size and easy to be put into a shell, and the actual filling rate of the battery core is improved, so that the battery capacity is improved. The battery core after being put into the shell is baked by the battery core, the compression state of the diaphragm is released, the pole piece is tightly attached to the diaphragm, and the vibration resistance of the battery is improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and relates to a production method for improving the capacity of a steel shell cylindrical lithium battery.
Background
The steel shell cylindrical lithium battery has the advantages of high safety performance, good consistency, good multiplying power performance, flexible grouping and the like, and has very wide application field, but the steel shell cylindrical lithium battery has small size, low weight specific energy and large-size square and soft package batteries, and the expansion of the steel shell cylindrical lithium battery in more fields is hindered. Currently 18650, 26650, 21700 and other types of steel-shell cylindrical battery enterprises improve the capacity of lithium batteries by improving the energy density of the positive electrode and the negative electrode, using thinner current collectors, diaphragms, supplementing lithium and other modes, but the lifting space is smaller and smaller.
18650. 26650, 21700 Etc. model steel shell cylinder battery production degree of automation is high, requires to roll up core external diameter size control in certain limit and just can guarantee full-automatic efficiency of going into the shell, and lithium cell cross section design filling rate generally controls below 96%, if improve the inside packing of lithium cell, and battery capacity can also continue to promote, can enlarge the application of steel shell cylinder battery in other fields like this, promotes lithium ion cell's high quality development.
Disclosure of Invention
The invention aims to provide a production method for improving the capacity of a steel shell cylindrical lithium battery, which improves the filling of the inside of the steel shell cylindrical lithium battery, thereby improving the capacity of the steel shell cylindrical lithium battery.
The invention relates to a production method for improving the capacity of a steel shell cylindrical lithium battery,
1) Before the lithium battery pole piece and the diaphragm are coiled, the diaphragm is sent into a vacuum rolling mechanism for rolling, the vacuum degree of the mechanism space is-0.08 MPa to-0.09 MPa, the pressure of the compression roller of the vacuum rolling mechanism is designed to be 0.05 to 0.2MPa, the vacuum rolling mechanism is vacuumized, the compression roller is flattened, the thickness compression rate of the diaphragm can be controlled to be 10 to 20 percent, and the diaphragm immediately enters the coiling;
2) The electrode plate and the diaphragm are wound on the battery core, the internal diaphragm is in a semi-compressed state, the wound battery core is installed, then the battery core is baked, the baking temperature of the battery core is 80-90 ℃, the vacuum degree of the baking environment is-0.08 MPa-0.09 MPa, and the vacuum time is 30-60S.
According to the production method for improving the capacity of the steel shell cylindrical lithium battery, the battery core is assembled, and is put into a lower gasket, a shell, a point bottom, an upper gasket and a rolling groove, and then is baked.
According to the production method for improving the capacity of the steel-shell cylindrical lithium battery, when the battery core is baked in a vacuum environment, the diameter of the inner winding core of the battery expands by 1.5% -3.5%,
Improving steel shell cylindrical lithium battery capacity according to the illustration
The lithium battery is used for lithium iron phosphate, lithium manganate, nickel cobalt lithium manganate and nickel lithium manganate positive electrode system lithium battery.
According to the production method for improving the capacity of the steel shell cylindrical lithium battery, the diaphragm is used for PP, PE, PP ceramics and PE ceramics diaphragms.
According to the production method for improving the capacity of the steel-shell cylindrical lithium battery, a PE diaphragm is placed into a vacuum roll squeezer, the vacuum degree is regulated to be minus 0.085MPa, a press roller of a rolling mechanism is made of plastic, the pressure is designed to be 0.1MPa, the thickness of the diaphragm before rolling is 12 mu m plus or minus 1 mu m, the diaphragm is vacuumized and flattened by the press roller of the rolling mechanism, the thickness of the diaphragm is compressed to be 10 mu m plus or minus 1 mu m, a positive pole piece and a negative pole piece of the cylindrical lithium iron phosphate battery and the PE diaphragm are mounted on a feeding mechanism of a winding machine, the positive pole piece is designed to be 1696mm in length, the positive pole piece is 146 mu m in thickness, the negative pole piece is 1797mm in length, the negative pole piece is 98 mu m in thickness, winding is directly carried out, the diameter of the wound battery is controlled to be 24.6mm plus or minus 0.1mm, the diameter of the battery is 24.6mm plus or minus 0.1mm after winding, and the wound battery is assembled into the capacity, and the battery is prepared.
According to the production method for improving the capacity of the steel shell cylindrical lithium battery, the battery is baked after the battery is prepared, the baking temperature of the battery is 85 ℃, the vacuumizing degree is-0.085 MPa, the vacuumizing time is 30S, the battery is released in a diaphragm compression state in vacuumizing, vacuum breaking and pressurizing processes, and the diameter expansion of the coil core inside the battery is 25.2mm plus or minus 0.1mm.
The invention has the advantages and effects that:
1. Before the lithium battery pole piece and the diaphragm are wound, the diaphragm is sent to a vacuum rolling mechanism for rolling and then is wound, the battery core is compressible in size and easy to be put into a shell, and the actual filling rate of the battery core is improved, so that the battery capacity is improved.
2. The battery core after the battery is put into the shell is baked through the battery core, the compression state of the diaphragm is released, the pole piece is tightly attached to the diaphragm, the internal conductivity of the battery is better, the compactness of the winding core and the steel shell in the battery is better, and the vibration resistance of the battery is improved.
Drawings
Fig. 1 is a schematic diagram of a vacuum rolling mechanism.
Detailed Description
The following describes the details of the present invention:
The invention relates to a production method for improving the capacity of a steel shell cylindrical lithium battery, which comprises the following steps,
1) Before the lithium battery pole piece and the diaphragm are coiled, the diaphragm is sent into a vacuum rolling mechanism for rolling, the vacuum degree of the mechanism space is-0.08 MPa to-0.09 MPa, the pressure of the compression roller of the vacuum rolling mechanism is designed to be 0.05 to 0.2MPa, the vacuum rolling mechanism is vacuumized, the compression roller is flattened, the thickness compression rate of the diaphragm can be controlled to be 10 to 20 percent, and the diaphragm immediately enters the coiling;
2) The pole piece and the diaphragm are wound into the battery core, the diaphragm in the battery core is in a semi-compression state, the wound battery core is assembled, and when the battery core is assembled, the lower gasket, the shell, the bottom of the spot, the upper gasket and the rolling groove are placed in the Xinin. And then the battery core is baked, the baking temperature of the battery core is 80-90 ℃, the vacuum degree of the baking environment is-0.08 MPa-0.09 MPa, and the vacuum time is 30-60S.
When the battery core is baked in a vacuum environment, the diameter of the winding core inside the battery expands by 1.5% -3.5%,
The production method of the invention can be used for lithium batteries of positive electrode systems such as lithium iron phosphate, lithium manganate, lithium nickel cobalt manganate, lithium nickel manganate and the like.
The diaphragm applied in the invention can be PP, PE, PP ceramic or PE ceramic diaphragm.
The present invention is illustrated by the following specific examples:
Preparing 26650-4500-3.2V model lithium iron phosphate battery, firstly placing PE diaphragm into vacuum roller press, vacuum degree is regulated to-0.085 MPa, the pressure of the roller press mechanism is designed to be 0.1MPa, the thickness of diaphragm before rolling is 12 μm + -1 μm, after vacuuming the diaphragm, pressing the diaphragm with the roller press mechanism, the thickness of diaphragm is compressed to 10 μm + -1 μm,
The positive and negative pole pieces and the PE diaphragm of the lithium iron phosphate battery are arranged on a feeding mechanism of a winding machine, the length of the positive pole piece is 1696mm, the thickness of the positive pole piece is 146 mu m, the length of the negative pole piece is 1797mm, the thickness of the negative pole piece is 98 mu m, the winding is directly carried out, the diameter of a wound battery core is controlled to be 24.6mm plus or minus 0.1mm, the diameter of the wound battery core is 24.6mm plus or minus 0.1mm, and the wound battery core is assembled into components to complete battery preparation.
And baking the battery core after the preparation of the battery is finished, wherein the baking temperature of the battery core is 85 ℃, the vacuumizing degree is-0.085 MPa, the vacuumizing time is 30S, the compressed state of the diaphragm is released in the vacuumizing, vacuum breaking and pressurizing processes of the battery core, and the diameter expansion of the coil core inside the battery core is 25.2mm plus or minus 0.1mm.
The cylindrical lithium battery pole piece manufactured by the method disclosed by the invention is tightly attached to the diaphragm, the actual filling of the lithium battery is increased, the design capacity of the battery is 4700mAh, and the internal resistance of the battery is 14.1mΩ -14.4 mΩ.
The 26650-4500mAh-3.2V lithium iron phosphate battery prepared by the process is tested, the design capacity of the lithium iron phosphate battery is improved by about 2.62%, the internal resistance is reduced, the capacity and the conductivity of the steel shell cylindrical lithium battery are effectively improved, and the high-quality development of the steel shell cylindrical lithium battery is promoted.
Claims (7)
1. A production method for improving the capacity of a steel shell cylindrical lithium battery is characterized in that,
1) Before the lithium battery pole piece and the diaphragm are coiled, the diaphragm is sent into a vacuum rolling mechanism for rolling, the vacuum degree of the mechanism space is-0.08 MPa to-0.09 MPa, the pressure of the compression roller of the vacuum rolling mechanism is designed to be 0.05 to 0.2MPa, the vacuum rolling mechanism is vacuumized, the compression roller is flattened, the thickness compression rate of the diaphragm can be controlled to be 10 to 20 percent, and the diaphragm immediately enters the coiling;
2) The electrode plate and the diaphragm are wound on the battery core, the internal diaphragm is in a semi-compressed state, the wound battery core is installed, then the battery core is baked, the baking temperature of the battery core is 80-90 ℃, the vacuum degree of the baking environment is-0.08 MPa-0.09 MPa, and the vacuum time is 30-60S.
2. The method for improving the capacity of a steel-shell cylindrical lithium battery according to claim 1, wherein the battery cells are assembled by placing a lower gasket, placing a shell, placing a bottom, placing an upper gasket and rolling a groove, and then baking the battery cells.
3. The production method for improving the capacity of the steel-shell cylindrical lithium battery according to claim 1, wherein the diameter of the inner winding core of the battery expands by 1.5% -3.5% when the battery core is baked in a vacuum environment.
4. The production method for improving the capacity of the steel shell cylindrical lithium battery according to claim 1, wherein the production method is used for lithium iron phosphate, lithium manganate, lithium nickel cobalt manganate and lithium nickel manganate positive electrode system lithium batteries.
5. The production method for improving the capacity of the steel-shell cylindrical lithium battery according to claim 1, wherein the diaphragm is one of PP, PE, PP ceramic and PE ceramic diaphragms.
6. The production method for improving the capacity of a steel-shell cylindrical lithium battery according to claim 1, wherein,
Placing PE membrane into vacuum roller press, vacuum degree is regulated to-0.085 MPa, press roller of rolling mechanism is made of plastic material, pressure is designed to be 0.1MPa, membrane thickness before rolling is 12 micrometers + -1 micrometers, after vacuum pumping, using press roller of rolling mechanism to flatten membrane thickness, and compression is 10 micrometers + -1 micrometers,
And (3) mounting the positive and negative electrode plates and the PE diaphragm of the cylindrical lithium iron phosphate battery to a feeding mechanism of a winding machine, designing the length of the positive electrode plate to be 1696mm, the thickness of the positive electrode plate to be 146 mu m, the length of the negative electrode plate to be 1797mm, the thickness of the negative electrode plate to be 98 mu m, directly winding, controlling the diameter of a wound battery core to be 24.6mm plus or minus 0.1mm, and assembling the wound battery core to be divided into components after winding, thereby completing the preparation of the battery.
7. The production method for improving the capacity of the steel-shell cylindrical lithium battery according to claim 1, wherein the battery is baked after being prepared, the baking temperature of the battery is 85 ℃, the vacuumizing degree is-0.085 MPa, the vacuumizing time is 30S, the compressed state of a diaphragm of the battery is released in the vacuumizing, vacuumizing and pressurizing processes, and the diameter expansion of a coil core inside the battery is 25.2mm plus or minus 0.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410213112.9A CN118054096A (en) | 2024-02-27 | 2024-02-27 | Production method for improving capacity of steel shell cylindrical lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410213112.9A CN118054096A (en) | 2024-02-27 | 2024-02-27 | Production method for improving capacity of steel shell cylindrical lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118054096A true CN118054096A (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410213112.9A Pending CN118054096A (en) | 2024-02-27 | 2024-02-27 | Production method for improving capacity of steel shell cylindrical lithium battery |
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| Country | Link |
|---|---|
| CN (1) | CN118054096A (en) |
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- 2024-02-27 CN CN202410213112.9A patent/CN118054096A/en active Pending
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