Method for quickly forming soft power lithium-ion cell

A formation method, lithium-ion technology, which is applied in the field of rapid formation of soft-pack power lithium-ion batteries, can solve the problem that the data size of constant current is not representative, the batteries cannot activate active materials well, and it is unfavorable for large-scale production and Promotion and other issues to achieve the effect of shortening the formation time, avoiding premature failure, and facilitating large-scale production

Active Publication Date: 2018-01-12
CAMEL GRP NEW ENERGY BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese Patent No.: CN 104362374 A discloses a method for forming and dividing small-capacity batteries, including the following steps: (1) connecting several small-capacity batteries in parallel, so that the positive tabs of the small-capacity batteries are connected to each other, and the negative tabs are connected to each other : (2) clamp the positive poles of the parallel small-capacity electric cores on the positive pole clips of the formation cabinet, and clamp the negative poles on the negative pole clips of the formation cabinets: (3) the formation cabinets carry out chemical formation treatment on the parallel small-capacity electric cores; the patent The application documents can only complete the formation of small-capacity batteries. For the huge lithium-ion battery market, this method has great limitations and is not conducive to mass production and promotion.
The size of the constant current data used in the patent application document is not representative, and the formed battery cells cannot activate the active material in the battery cells well, and the formed SEI film is not uniform, and then the batteries are assembled into lithium-ion batteries. The poor performance of the battery will cause problems such as premature failure of the lithium-ion battery during the cycle and rapid decay of the volume rate.

Method used

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  • Method for quickly forming soft power lithium-ion cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for rapidly forming a soft-pack power lithium-ion battery cell, comprising the following steps:

[0031] S1: Use a heating plate to provide a heat source to heat the cell;

[0032] S2: Use the servo motor to drive the pressure plate to pressurize the cell;

[0033] S3: Carry out step-by-step charging for the battery cell;

[0034] S4: Charge the battery to a high state of charge.

[0035] The temperature for heating the cell is: 30°C.

[0036] The pressurization pressure of the cell is: 0.3MPa.

[0037] The battery cell is charged stepwise, and the specific steps are:

[0038] The first stage: constant current charging, charging to 10% SOC of reversible capacity, charging current 0.05C;

[0039] The second stage: constant current charging, charging to 20% SOC of reversible capacity, charging current 0.2C;

[0040] The third stage: constant current charging, charging to 40% SOC of reversible capacity, charging current 0.4C.

[0041] The final charging cut...

Embodiment 2

[0045] A method for rapidly forming a soft-pack power lithium-ion battery cell, comprising the following steps:

[0046] S1: Use a heating plate to provide a heat source to heat the cell;

[0047] S2: Use the servo motor to drive the pressure plate to pressurize the cell;

[0048] S3: Carry out step-by-step charging for the battery cell;

[0049] S4: Charge the battery to a high state of charge.

[0050] The temperature for heating the cell is: 45°C.

[0051] The pressurization pressure of the cell is: 0.5MPa.

[0052] The battery cell is charged stepwise, and the specific steps are:

[0053] The first stage: constant current charging, charging to 10% SOC of reversible capacity, charging current 0.1C;

[0054] The second stage: constant current charging, charging to 30% SOC of reversible capacity, charging current 0.3C;

[0055] The third stage: constant current charging, charging to 50% SOC of the reversible capacity, charging current 0.5C.

[0056] The final charging ...

Embodiment 3

[0060] A method for rapidly forming a soft-pack power lithium-ion battery cell, comprising the following steps:

[0061] S1: Use a heating plate to provide a heat source to heat the cell;

[0062] S2: Use the servo motor to drive the pressure plate to pressurize the cell;

[0063] S3: Carry out step-by-step charging for the battery cell;

[0064] S4: Charge the battery to a high state of charge.

[0065] The temperature for heating the cell is: 80°C.

[0066] The pressurization pressure of the cell is: 1MPa.

[0067] The battery cell is charged stepwise, and the specific steps are:

[0068] The first stage: constant current charging, charging to 10% SOC of reversible capacity, charging current 0.2C;

[0069] The second stage: constant current charging, charging to 40% SOC of reversible capacity, charging current 0.4C;

[0070] The third stage: constant current charging, charging to 40% SOC of reversible capacity, charging current 0.8C.

[0071] The final charging cut-off ...

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Abstract

The invention discloses a method for quickly forming a soft power lithium-ion cell. The method comprises the following steps: (S1) supplying a heat source for heating a cell by using a heating plate;(S2) driving a pressurizing plate to pressurize the cell by using a servo motor; (S3) performing gradient charging on the cell; and (S4) charging the cell till reaching high charge state. According tothe invention, a stable, compact and uniform SEI film is formed on a cathode surface, the performance of the lithium-ion cell is greatly promoted, the early failure of the lithium-ion cell in the circulating process is avoided, the yield of the cell is increased, the cell quality is optimized, the forming time of the cell is shortened, the large-scale production of the cell is realized and the method has wide application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a rapid formation method for soft-pack power lithium-ion batteries. Background technique [0002] New energy technology is recognized as a high-tech in the 21st century. As an important part of the new energy field, the battery industry has become a new hot spot in global economic development. At present, lithium-ion batteries are widely used in the fields of electronic communication and transportation because of their advantages such as long life, no memory effect, low self-discharge rate, wide operating temperature range, high voltage platform, and high specific energy. In particular, in recent years, the blowout growth of the automotive power lithium-ion battery market has caused more and more battery manufacturers to expand production and increase capacity. However, the cycleability, consistency, and safety of batteries have always been hotly debated. The topic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCY02E60/10
Inventor 李新华张巧灵娄勇刚张宝华程诚许晓婵高国兴
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD
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