种基于电流预测的动力电池组均衡控制方法

• Format: Patent
• Language: Chinese
• Published: 10.07.2018
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; VEHICLES IN GENERAL

本发明公开了种基于电流预测的动力电池组均衡控制方法，包括以下步骤：建立电池的等效电路模型以及选择均衡拓扑结构；根据电池组输出电流的变化趋势，预测出输出电流的变化方向；计算各单体电池将产生的热量、老化率、SOC和温度不平衡度，并由此可得各单体电池总的不平衡度；根据约束条件，求得不平衡度的最大值与最小值，以此得到开关组合决策，并计算开关占空比。本发明主要应用于电动车辆的电池管理系统上，用于改善电池组的不致性问题，延长电池组的使用寿命，大幅度提高电池组的整体性能，保证电池组使用的安全性和可靠性。 The invention discloses a power battery pack balance control method based on current prediction. The method comprises the following steps: an equivalent circuit model for the battery is built and a balance topology structure is selected; according to the change trend of the output current of the battery pack, the output current change direction is predicted; a heat unbalance degree, an aging rate unbalance degree, an SOC unbalance degree and a temperature unbalance degree of each single battery can be calculated, and the total unbalance degree of each single battery is obtained; and according to constraint conditions, the maximum and minimum values for the unbalance degrees are obtained, a switch combination decision is thus obtained, and a switch duty cycle is calc