Control method, device and system for obtaining temperature of battery cell in battery pack and vehicle

Abstract

The invention provides a control method, device and system for obtaining the temperature of a battery cell in a battery pack and a vehicle. The method comprises the steps that the first space position of a target battery cell in the battery pack and a temperature correction coefficient corresponding to the target battery cell are obtained; acquiring a reference temperature of at least one reference temperature sensor corresponding to the target battery cell according to the first spatial position; and obtaining the cell temperature of the target cell according to the temperature correction coefficient and the reference temperature. According to the embodiment of the invention, the battery cell temperature is obtained according to the spatial position of the battery cell in the battery pack and the at least one reference temperature sensor, and the influence of the position of the battery cell on the battery cell temperature is fully considered, so that the accuracy of the obtained battery cell temperature is improved, the situation of false triggering of a fault is avoided, and the safety of the battery pack is improved. The charging and discharging capability of each battery cell is fully exerted, and the product competitiveness is improved; meanwhile, the number of temperature sensors and hardware acquisition channels does not need to be increased.

Description

technical field [0001] The present invention relates to the technical field of battery thermal management, and in particular, to a control method, device, system and vehicle for obtaining the temperature of cells in a battery pack. Background technique [0002] As a power source, the safety of the battery pack has attracted the attention of the majority of users and developers. Due to the different relative positions of the cells in the battery pack and the limitations of the thermal management system, the temperature of the cells inside the battery is quite different, and the maximum temperature difference can be Up to 10°C, and at different temperatures, the charge and discharge voltages and power limit thresholds of the cells are quite different. However, due to the limitation of the number of temperature acquisition channels, cost and space, temperature acquisition cannot be performed for each cell. Therefore, the maximum temperature of the entire battery pack is curren...

AI Technical Summary

Problems solved by technology

[0003] The technical purpose to be achieved by the embodiments of the present invention is to provide a control method, device, system and vehicle for obtaining the temperature of the battery cells in the battery pack, so as to solve the problem of inability to accurately identify the temperature of the battery cells, which may easily lead to failure of some batteries False triggering, charging and discharging capacity cannot be fully released, etc.

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