A method for rapid temperature rise and temperature control of lithium batteries

Abstract

The invention discloses a rapid heating and temperature control method for a lithium battery. The method includes the following steps that the lithium battery is placed on a heating plate directly orthrough a special battery tray, a drying oven sealing door is closed, and the vacuum degree of a drying oven is kept, wherein the vacuum degree of the drying oven is in a weak vacuum state or a normalpressure state, the weak vacuum range is 0.95*10<5>-0.2*10<2> Pa, and the normal pressure vacuum degree is 1.01*10<5>-0.95*10<5> Pa; electrifying and heating are carried out, so that the drying ovenenters a rapid heating stage; when the temperature of the bottom of the lithium battery is close to a set value, a vacuum pump is used for rapidly vacuumizing the drying oven step by step. The batterycan be quickly heated by using the rapid heating and temperature control method for the lithium battery, the temperature uniformity of the battery is remarkably improved, and the heating speed is greatly increased. Compared with air heating, the temperature uniformity of the battery is reduced from + / -10 DEG C or above to + / -3 DEG C, the heating speed is shortened from 2 h to 1 h, and better application prospects are brought.

Description

technical field [0001] The invention relates to the field of vacuum drying, in particular to a method for rapid temperature rise and temperature control of lithium batteries. Background technique [0002] Lithium batteries refer to lithium batteries containing lithium (including metal lithium, lithium alloys, lithium ions, and lithium polymers) in the electrochemical system. Lithium batteries can be roughly divided into two types, lithium metal lithium batteries and lithium ion lithium batteries. Lithium ion batteries Lithium batteries do not contain metallic lithium and are rechargeable; [0003] The existing polymer coating film connection method has certain disadvantages in use. During the drying process of the lithium battery, the lithium battery must first be heated, and the moisture in the lithium battery is quickly evaporated in a vacuum environment and sucked away, thereby To achieve the purpose of rapid drying of lithium batteries, but the traditional oven adopts t...

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Problems solved by technology

[0003] The existing polymer coating film connection method has certain disadvantages in use. During the drying process of the lithium battery, the lithium battery must first be heated, and the moisture in the lithium battery is quickly evaporated in a vacuum environment and sucked away, thereby To achieve the purpose of rapid drying of lithium batteries, but the traditional oven adopts the air-driven heating method, the heating speed of lithium batteries is slow, the heating is uneven, and the temperature difference of lithium batteries in different positions is very large. Generally, the peripheral lithium batteries are heated first and the temperature It is relatively high, and the lithium battery inside is difficult to quickly absorb heat from the hot air, and the heating time is very long, which seriously affects the drying efficiency of the lithium battery. Another heating method is to clamp a lithium battery with two heating plates. Heating by contact conduction heating, the lithium battery heats up quickly

However, the structure is very complicated. When a large number of lithium batteries are heated at the same time, the temperature control structure is very complicated. The power of the heating plate and the clamping force of the lithium battery are different, which will cause uneven heating of the lithium battery, resulting in high overall cost and easy damage. , high maintenance cost, for this reason, we propose a method for rapid temperature rise and temperature control of lithium batteries

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