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Liquid injection method for lithium ion battery
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A lithium-ion battery and liquid injection technology, which is applied in the direction of battery pack parts, circuits, electrical components, etc., can solve the problems of affecting the penetration speed of the electrolyte into the cell, affecting the electrochemical performance of the battery, and slow infiltration speed, etc., to achieve suitable Large-scale industrial production, improved injection and infiltration efficiency, good infiltration effect
Active Publication Date: 2018-11-06
CALB CO LTD
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[0005] Although the above method promotes the absorption of the electrolyte to a certain extent, the inside of the battery is mostly in a negative pressure state during the standing process, which affects the penetration speed of the electrolyte into the battery cell, resulting in a slow infiltration speed. If the standing time is short, leakage will occur. The unevenness of the liquid affects the electrochemical performance of the battery
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Embodiment 1
[0035] The liquid injection method of the lithium ion battery of the present embodiment, as figure 1 shown, including the following steps:
[0036] 1) Vacuumize the inside of the battery case to a vacuum degree of -95KPa, and the time for vacuuming is T 1 = 40s;
[0037] 2) Maintain a high vacuum degree inside the battery case at -95KPa, and hold the pressure for a time T 2 = 1s;
[0038] 3) Inject the electrolyte solution into the battery case, the injection process time T 3 =55s, the liquid injection process time is slightly shorter than the time of vacuuming in step 1);
[0039] 4) Introduce dry air into the battery case to release the pressure to atmospheric pressure, and the pressure release time is T 4 = 2s;
[0040] 5) Take the following pressurization, pressure relief, vacuuming, and pressure relief as a cycle, and carry out cyclical standing:
[0041] Fill the inside of the battery case with nitrogen with a pressure of 0.020MPa to pressurize for 80s, ventilate ...
Embodiment 2
[0053] The liquid injection method of the lithium ion battery of the present embodiment, as figure 1 shown, including the following steps:
[0054] 1) Vacuumize the inside of the battery case until the vacuum degree is -90KPa, and the time for vacuuming is T 1 = 40s;
[0055] 2) Maintain a high vacuum degree inside the battery case at -90KPa, and hold the pressure for a time T 2 = 2s;
[0056] 3) Inject the electrolyte solution into the battery case, the injection process time T 3 =35s, the liquid injection process time is slightly shorter than the time of vacuuming in step 1);
[0057] 4) Introduce dry air into the battery case to release the pressure to atmospheric pressure, and the pressure release time is T 4 = 1s;
[0058] 5) Take the following pressurization, pressure relief, vacuuming, and pressure relief as a cycle, and carry out cyclical standing:
[0059] Fill the inside of the battery case with nitrogen with a pressure of 0.035MPa to pressurize for 60s, venti...
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Abstract
The invention discloses a liquid injection method for a lithium ion battery, which comprises the following steps: 1) vacuumizing the inside of the battery case; 2) keeping the pressure; 3) injecting electrolyte; 4) releasing the pressure; Pressurization, pressure release, vacuum pumping, and pressure release are a cycle, and the cycle is static: fill in nitrogen with a pressure of 0.020-0.035MPa to pressurize for 60-80s, release the pressure, and evacuate until the vacuum degree is -65KPa~ ‑90KPa, release the pressure; 6) Inflate nitrogen and keep it for 30-80s; 7) Release the pressure, that is, the liquid injection is completed. The method optimizes the parameters of the liquid injection process, selects an effective liquid injection process and adjusts the liquid injection parameters, and alternates positive and negative pressures to cycle and stand still, which reduces the frequency of liquid spraying at the battery liquid injection hole and greatly improves the battery life. The injection and infiltration efficiency of the electrolyte is improved; the infiltration effect of the electrolyte on the cell is good, which ensures the electrochemical performance and safety of the lithium-ion battery.
Description
technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a liquid injection method for lithium ion batteries. Background technique [0002] Lithium-ion batteries generally include a battery case and a battery cell and an electrolyte contained in the battery case. The battery cell includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode; It plays the role of conducting electrons, and acts as a lithium-ion current transmission medium in the process of battery charging and discharging, which is the guarantee for lithium-ion batteries to obtain the advantages of high voltage and high specific energy. Therefore, in the production process of lithium-ion batteries, liquid injection and standing are very important process operations. After the battery assembly is completed, the electrolytic solution is injected into the plating cell, and the batter...
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