Lithium battery equipment industry and key enterprises

Battery classification

Lithium ion batteries are divided into soft pack lithium batteries, square lithium batteries, and cylindrical lithium batteries according to their appearance.

Soft pack battery: A liquid lithium-ion battery is covered with a polymer shell. The structure adopts aluminum-plastic film packaging, and in the event of safety hazards, the soft pack battery will only burst and crack. Square battery: usually refers to aluminum or steel shell square batteries. Cylindrical batteries: divided into lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, cobalt manganese mixture, and different ternary material systems. The shell is divided into two types: steel shell and polymer.

Soft pack, square, and cylindrical batteries each have their own advantages in different performance. Among them, in terms of product consistency, cylindrical batteries perform better than soft pack and square batteries. Soft pack batteries perform the best in terms of cell safety, setting flexibility, cycle life, and charge discharge rate performance, while cylindrical batteries perform weaker. Square batteries also perform better than cylindrical batteries in terms of pack efficiency performance.

Lithium battery equipment

According to the production process of lithium-ion batteries, it is generally divided into three steps: electrode fabrication, cell assembly, and post-processing (activating the cell), which are the first, middle, and last steps. The core equipment includes the mixer, coating machine, and roller separator in the front section, the winding machine, laminating machine, and welding machine in the middle section, and the chemical composition and separation equipment in the rear section.

The previous process is the production of polarizers, including homogenization, coating, drying, rolling, and slitting, among which coating, rolling, and slitting are the main processes. Coating: Evenly applying the stirred slurry onto the substrate copper foil (negative electrode carrier) and aluminum foil (positive electrode carrier) to produce positive and negative electrodes, is one of the key processes in the development and production of lithium-ion batteries. Rolling: Rolling and pressing the pre coated positive and negative electrode materials to better adhere to the aluminum and copper foils, improving the energy density of the battery. Splitting: Splitting refers to the continuous longitudinal cutting of a wider coil into several narrow pieces of the desired width. The main technical requirements for lithium-ion batteries for electrode plates are that the segmented electrode plates must not have wrinkles or powder shedding, and the segmented size accuracy is high. At the same time, it is required that the burrs on the edge of the electrode plates are small.

The intermediate process is the assembly of battery cells, including liquid injection, welding cap, welding, shell insertion, winding or stacking, among which winding or stacking is the main process. Winding: Making bare cells of lithium-ion batteries from the electrodes produced in the production process. Winding battery cells refer to battery cells with a layer of separator sandwiched between the positive and negative electrode coils or long sheets, which are wound together into a cylindrical or prismatic shape. It is one of the key processes in the manufacturing of lithium-ion batteries. Stacking: Stacking the die-cut positive and negative electrodes with the separator to form the bare battery cells.

The subsequent process is post-processing, with cell formation and capacitance separation as the main processes. Formation: Perform charging activation and measure capacity. Sorting: Classify the formed batteries according to their 1C discharge capacity to meet different capacity requirements. Detection: The charging and discharging motor records the relevant data and curve charts of the battery cell charging and discharging, which are used as the basis for calculating the capacitance of the battery cell and evaluating whether the battery cell is qualified and how to classify it. In addition to charging and discharging, the battery cell also needs to be tested by specialized testing equipment before and after being placed stationary to test the voltage and internal resistance of the battery cell.

In terms of production technology, the front section of the soft pack electricity

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