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Energy-storing device with low internal resistance and production method thereof

A technology of low internal resistance and devices, which is applied in the field of low internal resistance energy storage devices and its manufacturing, can solve the problems of high manufacturing precision of circlips, many times of welding, poor contact, etc., and achieve volumetric power density and volumetric energy density. High, the effect of improving reliability

Active Publication Date: 2010-09-29
CHAOYANG LIYUAN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although there are some improvements in the lead-out method of the electrodes, there is little progress, such as: (1) welding the tabs to the positive and negative current collectors by means of ultrasonic or rivet riveting, and then welding the tabs to the end plates On the metal connection sheet, this connection method has many welding times, and it is necessary to reserve space for the tab and the connection piece inside the device; (2) Weld multiple tabs on the electrode sheet, and weld multiple tabs on a small metal plate , the metal plate is connected to the end plate through the circlip structure. This method requires high manufacturing precision of the circlip, and it is easy to cause poor contact; (3) Weld the tab on the electrode piece, leave a hole in the core part of the core package, use The spot welding machine welds one electrode lug of the core package to the bottom of the shell through the hole, and the other electrode uses a spot welding machine to weld the lug to the end plate. Resistance is still high

Method used

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  • Energy-storing device with low internal resistance and production method thereof
  • Energy-storing device with low internal resistance and production method thereof
  • Energy-storing device with low internal resistance and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Positive electrode slurry preparation (by weight): Lithium manganese oxide 95% for commercialized lithium ion batteries, conductive carbon black 2%, commercial lithium ion battery binder L135 (3%) and the total amount of the above solid sample 5 times the total amount of water was mixed in a vacuum planetary mixer for 8 hours to form a uniform slurry.

[0030] 2. Preparation of negative electrode slurry (by weight): 91% of artificial graphite for commercial lithium-ion batteries, 2% of conductive carbon black, binder SBR (5%), CMC (2%) and the total amount of the above solid sample 3.8 times the total amount of deionized water was mixed in a vacuum planetary mixer for 8 hours to form a uniform slurry.

[0031] ③ Slurry coating: Use a coating machine to evenly coat the above prepared positive electrode slurry on the aluminum foil current collector, and coat the negative electrode slurry on the copper foil current collector, and leave 10mm gaps on both sides of the cur...

Embodiment 2

[0053] 1. Positive electrode slurry preparation (by weight): 85% of activated carbon for commercialized organic supercapacitors, 8% of conductive carbon black, commercial lithium-ion battery binder L133 (7%) and the total amount are the total amount of the above solid samples 5 times water, mixed in a vacuum planetary mixer for 8 hours to form a uniform slurry.

[0054] ② Negative electrode slurry preparation: same as Step ① of Example 2.

[0055] ③ Slurry coating: same as the ③ step of embodiment 1.

[0056] ④ Pole sheet rolling: same as step ④ of Example 1.

[0057] 5. pole piece cutting: same as the 5th step of embodiment 1.

[0058] 6. Winding core pack, shell: the same as the 6th step of embodiment 1.

[0059] 7. Welding: same as the 7th step of embodiment 1.

[0060] 8. drying: same as the 8th step of embodiment 1.

[0061] ⑨ Electrolyte injection: Under vacuum, inject the organic supercapacitor commercial electrolyte (1M Et4NBF4 solvent is acetonitrile) into the dr...

Embodiment 3

[0077] ① Positive electrode slurry preparation (by weight): 85% lithium ferrous phosphate for commercial lithium-ion batteries, 7.5% activated carbon, 0.5% conductive carbon black, binder SBR (5%), CMC (2%) And the deionized water whose total amount is 3.8 times of the total amount of the above-mentioned solid sample was mixed in a vacuum planetary mixer for 8 hours to form a uniform slurry.

[0078] ② Negative electrode slurry preparation (by weight): 85% of mesocarbon microspheres for commercial lithium-ion batteries, 10% of conductive carbon black, 0.5% of commercial organic supercapacitor activated carbon, commercial lithium-ion battery binder L135 ( 4.5%) and a total amount of water that is 5 times the total amount of the above-mentioned solid samples were mixed in a vacuum planetary mixer for 8 hours to form a uniform slurry.

[0079] ③ Slurry coating: same as the ③ step of embodiment 1.

[0080] ④ Pole sheet rolling: same as step ④ of Example 1.

[0081] 5. pole piece...

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Abstract

The invention discloses an energy-storing device with low internal resistance and a production method thereof. A certain blank margin is reserved for a current collector when an electrode plate of the energy-storing device is produced; a core cladding consists of a positive electrode plate, a negative electrode plate and a diaphragm; current collectors of a positive electrode and a negative electrode respectively extend out of two ends of the core cladding; and the current collectors of the positive electrode and the negative electrode of the core cladding of the energy-storing device are respectively welded on a positive electrode end plate and a negative electrode end plate which are provided with lead-out binding posts by adopting a wall-viewing welding process. The energy-storing device suitable for the method comprises a device for storing energy by using an electrochemical principle and a device for storing energy by using a physical principle, such as lithium ion battery, a super capacitor, a double electric layer capacitor, a capacity battery, a high-power battery and the like. The invention can greatly reduce the lead-out resistance of an electrode lug of the energy-storing device, improve the power performance, does not use a transitional electrode lug, further improves the utilization rate of an inner space of the energy-storing device and ensures that the volume power density and the volume energy density of the energy-storing device are higher; and compared with the riveting and crimping, the laser welding is beneficial to further improving the reliability of the device.

Description

technical field [0001] The invention relates to the field of manufacturing energy storage devices, in particular to a low internal resistance energy storage device and a manufacturing method thereof. Background technique [0002] Power supply is an indispensable part of all kinds of circuits. In the absence of mains power, only by storing electric energy can the circuit be used. Therefore, various energy storage devices are an important part of the mobile power system, and their performance is directly related to the service life and power characteristics of mobile appliances. and other important indicators. [0003] At present, energy storage devices include primary batteries, secondary batteries, and supercapacitors. The primary battery is not rechargeable and cannot be used repeatedly, and the comprehensive use cost is high. Secondary batteries can be repeatedly charged and discharged, and are currently the preferred energy storage devices for many mobile appliances. A...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/058H01G9/155H01G11/70
CPCY02E60/122Y02E60/13Y02E60/10Y02P70/50
Inventor 李荐李国君
Owner CHAOYANG LIYUAN NEW ENERGY
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