A kind of method that improves lithium-ion battery, lithium-ion battery pack cycle life
A lithium-ion battery pack and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of high cost, low utilization efficiency of unqualified lithium-ion batteries, and low utilization efficiency of unqualified lithium-ion batteries, so as to reduce internal resistance, to achieve full utilization, and to reduce the cost of components
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0039] The method for improving the cycle life of the lithium-ion battery pack of the present embodiment is aimed at cascade utilization of lithium-ion batteries, and the basic situation of cascade utilization of lithium-ion batteries is: the cascade utilization of lithium-ion batteries is the eliminated battery (lithium iron phosphate battery) for electric vehicle batteries ), the rated capacity is 40Ah, and the actual capacity is not higher than 32Ah. Include the following steps:
[0040] 1) Capacity screening: test the discharge capacity of the single batteries to be grouped, first use 0.2C to fully charge, then use 1C to discharge to the cut-off voltage of 2.5V, and screen out the single batteries whose capacity meets the requirements; the capacity meets the requirements: for the rated 75-80% of capacity.
[0041] 2) Internal resistance screening: test step 1) the internal resistance of the screened single cells, and sort out the single cells that meet the internal resist...
Embodiment 2
[0054] The method for improving the cycle life of lithium-ion battery packs in this embodiment, the situation of cascade utilization of lithium-ion batteries and the specific implementation steps are basically the same as those in Example 1, the only difference being:
[0055] In step 3), the single battery that does not meet the internal resistance requirement is discharged at a rate of 0.3C until the state of charge is 5%, and then the electrolyte is injected through the liquid injection port on the cover plate of the single battery (the injection amount is the battery standard note 5% of the liquid volume), then vacuumize the battery casing, and then feed the film-forming gas SO into the casing of the single battery 2 , SO 2 The inflow flow is 2.5m 3 / h, the case leading to the single battery is placed under 1.1 atmospheres and sealed, and then left to stand at a high temperature of 45°C for 72h.
Embodiment 3
[0057] The method for improving the cycle life of lithium-ion battery packs in this embodiment, the situation of cascade utilization of lithium-ion batteries and the specific implementation steps are basically the same as those in Example 1, the only difference being:
[0058] In step 3), the single battery that does not meet the internal resistance requirement is discharged at a rate of 0.3C until the state of charge is 10%, and then the electrolyte is injected through the liquid injection port on the cover plate of the single battery (the injection amount is the battery standard note 7% of the liquid volume), then vacuumize the battery casing, and then pass the film-forming gas NO into the casing of the single battery 2 , NO 2 The inflow flow is 2.5m 3 / h, the casing leading to the single battery is under 1.1 atmosphere pressure and sealed, and then left at 65°C for 24h.
[0059] In other embodiments of the method for improving the cycle life of lithium-ion battery packs o...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More