High-energy battery pack heating temperature control system and method

Abstract

The invention discloses a high-energy battery pack heating temperature control system. The high-energy battery pack heating temperature control system comprises a battery pack residual electric quantity detection system, a battery pack temperature detection system, a battery pack heating system, a battery pack temperature equalizing system and a controller, wherein the battery pack residual electric quantity detection system is used for detecting battery residual electric quantity, the battery pack temperature detection system is used for detecting the battery temperature, the battery pack heating system is used for heating batteries, the battery pack temperature equalizing system is used for equalizing the temperature of a battery pack, the controller is connected with and controls the battery pack residual electric quantity detection system, and a battery thermal management mode can be judged through the battery pack temperature detection system and the battery pack heating system. According to the high-energy battery pack heating temperature control system, the good charge and discharge performance of the batteries is ensured through the synergistic effect. The invention provides a high-energy battery pack heating temperature control method, through synergistic effect control of the temperature control system, the batteries can be rapidly heated to the target temperature, moreover, the consistency of the temperature of the battery individuals and the module temperature can be ensured, and then all the parts are all in a reasonable temperature range when the battery packworks.

Description

technical field [0001] The invention relates to the fields of battery thermal management and battery safety, in particular to a high-energy battery pack heating temperature control system and a control method thereof. Background technique [0002] As the only source of power for pure electric vehicles, the power battery directly affects the power performance, cruising range and vehicle performance of the vehicle. With the continuous increase of battery energy density, the demand for fast charging at low temperature and fast charging at room temperature continues to rise. Starting an electric vehicle quickly at low temperature or charging a battery pack with rapid heating will seriously affect work efficiency and safety, and cause damage to the battery, affecting the cycle life of the battery pack. [0003] Based on a series of problems of the battery at low temperature, in order to ensure the charging and discharging performance of the battery, avoid the reduction of the cy...

AI Technical Summary

Problems solved by technology

[0004] In order to improve the heating efficiency, the general heating strategy is to heat the battery to a specified temperature with a constant power of the heating device. Although this method can make the temperature of some parts of the battery reach the set target temperature, due to the thermal conductivity of the battery is The opposite sex leads to very uneven temperature distribution of the battery. For a square battery, the thermal conductivity perpendicular to the lamination direction is much smaller than the circumferential thermal conductivity; for a cylindrical battery, the axial thermal conductivity is also much smaller than the circumferential thermal conductivity. coefficient

During low-temperature start-up and low-temperature fast charging, the uneven temperature distribution of the battery is likely to cause safety problems in the battery

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