Forklift power lithium battery solution



Forklift lithium battery design requirements

The forklift lithium battery is designed to be used in supporting logistics forklifts. It requires a small size and a relatively long working time. It can drive two motors: one is to drive the vehicle to run, and the other is to drive the lifting object. The appearance is moisture-proof, long cycle life, high-power, high-current discharge performance; the whole product adapts to the indoor environment, and the temperature rise should be low.

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Forklift lithium battery design scheme

1) Protection board: According to the chemical characteristics of the lithium battery pack and the working characteristics of the forklift, the protection circuit is specifically designed. In addition to the functions of overcharge, overdischarge, overcurrent, and short circuit protection, the protection board design also fully considers the The problem of power dissipation and the balance of the entire battery pack, the entire protection board uses aluminum alloy as the heat dissipation substrate, and the temperature rise is less than 20 degrees

2) Protection circuit: Imported ic and mos tubes are used to perform online real-time monitoring of overcharge, overdischarge, overcurrent, short circuit and other functions of the cell, so that the cell can work in a safe, stable and efficient range.

3) Overcurrent fuse: Mainly designed for the protection failure of the battery management system of the lithium battery itself. Because the battery pack uses high-power cells with a relatively large capacity, although the battery management system has over-current and short-circuit protection, if an abnormality occurs, the protection function will fail, and a very large current will be generated in the case of an output short circuit, causing danger Occurs, so an over-current fuse is added to the program. When an abnormal short circuit occurs, the fuse will disconnect the circuit and cannot be restored to achieve the purpose of abnormal protection.

4) Resistive equalization is used inside the battery pack, which can effectively compensate for the reduction in capacity caused by the difference of single cells during use, and maximize the service life of the battery

5) Battery parallel unit: Use ptc isolation to avoid inrush current safety problems caused by large capacity.

6) The high-current main circuit of the battery uses copper tape as the collector bar, and try to keep the discharge current of the single battery as close as possible.

7) The battery pack uses a plastic bracket to isolate and fix the cells, which is more conducive to the heat dissipation and safe use of the battery.