Lithium battery manufacturing process

The lithium battery production process:

The first step - the preparation of electrode coating

Mainly the electrode active material, binder and solvent are mixed together, after fully mixing dispersion, form a paste.

Step 2 - coated

Will be the first step in the preparation of stock to specify the thickness of coating to the collection of fluid (aluminum foil and copper foil, etc.), and drying solvent.

Step 3 - sheet cutting

Will be made on step plate cutting into the size of the specified shape.

Step 4 - laminated

Will is negative, the diaphragm assembly together, after finishing the rubberizing, form the very core.

Step 5 - assembly soft package battery

Will step on the production of the core loading has good pit aluminum-plastic film, and complete the top kill, side sealing mouth (and leave a note liquid), such as forming injection liquid soft package of the battery.

Step 6 - injection liquid

Previous quantitative electrolyte injection of soft package of batteries inside.Batteries will, of course, after baking, and under the environment of low humidity liquid injection operation, the moisture content is not too much.

Step 7 - sealed battery

Batteries in vacuum environment of internal gas extraction and complete sealing.

Lithium battery production process is complicated, the main production process mainly covers the electrode made of coated stage (front), batteries of synthetic winding injection liquid phase (middle), and turned to encapsulate the phase of testing (section), value (purchasing amount) accounted for about 35-40% () : (30 ~ 35) % (30 ~ 35) %.Differences mainly comes from the different equipment suppliers, the proportion of import/domestic differences, such as process flow, value deviation but overall than to have to meet the percentage.

Lithium electricity production in process of lithium electricity equipment mainly includes vacuum mixer, coating machine, rolling machine, etc.;The middle process mainly includes the die cutting machine, winding machine, lamination machine, liquid injection machine, etc.;After a process is included into machine, capacity testing equipment, the process of logistics automation, etc.In addition, the battery production need Pack automation equipment.

Lithium battery front-end process is the result of the lithium battery anode slice preparation is complete, the first process is stirring, the positive and negative solid-state batteries materials evenly mixed to join the solvent, through vacuum mixer to form a paste.Ingredients of the mixing is the basis of lithium electricity the follow-up process, high mixing quality is subsequent coating, rolling the basis of high quality to complete the process.

After coating and rolling process is cut, the coating for cutting process.If during the process of cutting burr subsequent assembly, such as electrolyte injection program, even in the process of using the battery safe hidden trouble.So the front-end equipment in the process of producing lithium electricity, such as mixer, coating machine, rolling machine, slitting machine, is the core of the battery manufacturing machines, such as about the quality of the whole production line, therefore the front-end equipment value (amount) of the lithium electricity automatic production line of the highest proportion, about 35%.

Lithium battery manufacturing process, the middle process is mainly to complete the battery of forming, the main technological process includes production, plate coiling, die-cutting, batteries, winding forming and laminated molding and so on, is the current domestic equipment manufacturers more competitive, a field value is about 30% of lithium battery production line.

At present, power lithium battery batteries manufacturing process of the main winding and laminated two kinds, the corresponding cell structure form for cylindrical and square, three kinds of soft package, cylindrical and square cells mainly adopts winding process, the soft package battery mainly USES the lamination process.Cylindrical mainly represented by 18650 and 26650 (Tesla developed 21700 batteries alone, are the industry promotion), the difference between the square and soft package is shell hard aluminum and aluminum composite membrane were used respectively to two kinds, mainly lamination process with soft package, aluminum shell is given priority to with winding process.

Soft package structure form is mainly for high-end digital market, higher margin per unit product, under the condition of same capacity, relatively higher than profit aluminum shell battery.Due to aluminum battery easy to form scale effect, the product qualified rate and the cost is easy to control, at present the two in their areas all have substantial profits, the market for the foreseeable future, both are difficult to be replaced completely.

Because of the winding process can speed the high-speed production of batteries, and laminated technology can improve the speed is limited, so the current domestic power lithium battery mainly adopts the winding process is given priority to, so the shipments of winding machine is greater than the lamination machine at present.

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