Lithium battery system and overhead working truck

Abstract

The invention relates to the technical field of engineering machinery, and discloses a lithium battery system and an overhead working truck. The lithium battery system comprises a battery and a feedback current control device, wherein the feedback current control device comprises a plurality of current capture module groups, each module group comprises a heating module matched with the position ofa battery module and used for capturing feedback current, a first switch module used for conducting a current capture branch where the switch module is located, and a control module used for receiving a first voltage and a second voltage on a main circuit and the average temperature of the battery, controlling the first switch module in each current capture module group to switch on the current capture branch in which the first switch module is located when the difference between the first voltage and the second voltage is greater than a preset voltage and the average temperature of the battery is less than or equal to a preset temperature, and converting the feedback current into heat energy by the heating module to heat the corresponding module. According to the invention, the probability of lithium precipitation of the battery and the risk of thermal runaway of the battery can be greatly reduced.

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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