Lithium battery system and aerial work vehicle

Abstract

The invention relates to the technical field of engineering machinery, and discloses a lithium battery system and an aerial work vehicle. Lithium battery system includes: battery and feedback current control device. The feedback current control device includes: a plurality of current capture module groups, each module group includes: a heating module, which is set in accordance with the position of the battery module, to capture the feedback current; and a first switch module, which is used to conduct the The current capture branch and the control module are used to: receive the first voltage and the second voltage on the main circuit and the average temperature of the battery; when the difference between the first voltage and the second voltage is greater than the preset voltage and the battery When the average temperature is less than or equal to the preset temperature, by controlling the first switch module in each current capture module group, the current capture branch it is in is turned on, so that the feedback current is converted into heat energy by the heating module Heat the corresponding modules. The invention can greatly reduce the probability of lithium precipitation in the battery and the risk of thermal runaway of the battery.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a lithium battery system and an aerial work vehicle. Background technique [0002] Since electric drive aerial work vehicles (self-propelled) usually do not have mechanical friction brakes, the deceleration and parking of the aerial work vehicles rely on energy feedback regenerative braking technology. However, the regenerative braking technology has the following two characteristics: 1. The travel motor driver is both an inverter and a rectifier. When the aerial work vehicle decelerates or goes downhill, it converts kinetic energy into electrical energy, and then feeds the converted electrical energy back to the power Battery; 2. The deceleration and braking time of aerial work vehicles is usually short, and the maximum speed is usually about 6KM / H, and the instantaneous pulse feedback current generated by braking is usually relatively large. Therefore, for the op...

AI Technical Summary

Problems solved by technology

However, the power of the heating device is limited by various factors, and the temperature rise rate is usually around 10°C / h

When the temperature is low, the time required for heating is longer, which affects the use of equipment by customers

In addition, since aerial work vehicles usually work intermittently, the shutdown interval is long, and the battery temperature is difficult to maintain (the battery temperature cannot be guaranteed to be kept above 0°C during discharge), so this method is not effective and the user experience is poor. Existing technologies have very limited effect on reducing the risks of pulse charging at low temperatures

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