Improvement Method of Battery Life Attenuation of Lithium Battery Forklift Used in Low Temperature Environment

Influence of Low Temperature Environment on Battery Life of Lithium Battery Forklift

The low temperature environment will significantly affect the electrochemical activity of lithium batteries. The viscosity of the electrolyte increases with the decrease of temperature, and the ion conduction efficiency decreases, resulting in the shrinkage of the available capacity of the battery. At the same time, the internal resistance of the battery will increase with the decrease of temperature, and more power will be consumed to overcome the internal resistance during operation, further exacerbating the battery life attenuation. In addition, low temperature will also affect the operating efficiency of the power system, and the working load of the motor and controller will also indirectly lead to the shortening of battery life.

Improvement Method of Low Temperature Battery Life Attenuation of Lithium Battery Forklift

Optimize battery warm-up strategy

Before low temperature operation, the battery can be preheated by the on-board preheating system to raise the battery temperature to a suitable working range, usually between 10 ° C and 30 ° C. The preheating process can be heated by low power constant temperature to avoid damage to the battery structure caused by rapid heating. For long-term parking forklifts, they can be placed in a warehouse with thermal insulation conditions to reduce the temperature loss of the battery itself.

Adjust power system parameters

According to the characteristics of low temperature environment, optimize the operation logic of the motor and controller, adjust the torque output curve, and avoid the appearance of high current discharge scenarios. For example, when starting and heavy-duty operations, appropriately reduce the instantaneous torque peak to reduce unnecessary power consumption. At the same time, the energy recovery system can be adjusted to improve the energy recovery efficiency during braking, and further supplement the battery life.

Strengthen daily maintenance

Regularly check the state of the lithium battery to clean the oxides on the surface of the battery pole to ensure smooth current conduction. Check whether the insulation layer of the battery pack is in good condition. If it is damaged, repair or replace it in time to reduce heat loss in low temperature environments. In addition, the battery should be regularly calibrated according to the specifications to ensure that the battery management system can accurately identify the remaining capacity and avoid abnormal battery life caused by misjudgment of capacity.

Rational planning of the operation process

In the low temperature operation scenario, rationally plan the operation route to reduce unnecessary round-trip driving and reduce ineffective energy consumption. Try to avoid frequent starts and stops, sudden acceleration, sudden braking and other operations, maintain a stable operation rhythm, and reduce the load fluctuation of the power system. At the same time, the rest time of the forklift can be reasonably arranged according to the operation needs, so that the battery can maintain a suitable temperature during the intermittent period to avoid the performance degradation caused by continuous low temperature operation.