Active balanced battery management system

Abstract

The invention provides an active balanced battery management system, which comprises a host computer and a CAN communication module, wherein the host computer transmits a control instruction to the battery management system through the CAN communication module; the battery management system transmits data to the host computer through the CAN communication module and is connected with an on-board control system and a charger through the CAN communication module; and the battery management system is also connected with a voltage collection module, a current collection module and a temperature collection module through an RS232 and obtains AD sampled data of voltage, current and temperature of a battery. A novel SOC calculation mode is provided, so that the problem that the prior art is inaccurate in calculation accuracy of the battery capacity is solved. The parameters of an upper limit and a lower limit of the battery capacity, charging and discharging current, a battery temperature and the like are set through the host computer; and the battery is effectively protected. The invention provides a novel charging mode standard, so that the battery can be more effectively charged.

Description

technical field [0001] The invention relates to the field of lithium batteries for new energy electric vehicles, in particular to an active balancing battery management system, which is suitable for balancing processing of lithium batteries. Background technique [0002] More and more electric vehicles use lithium-ion batteries as the main power source, mainly because lithium-ion batteries have the advantages of small size, high energy density, no memory effect, high cycle life, and low self-discharge rate. [0003] The performance and safety of lithium batteries are controlled by the BMS battery management system. The BMS battery management system is the link between the electric vehicle and the battery pack. It is mainly used for battery parameter setting, battery charge and discharge management, battery balance and battery status display. [0004] Enterprises that make battery packs will consider parameters such as capacity, platform, internal resistance, and self-discha...

AI Technical Summary

Problems solved by technology

[0006] 1. The efficiency of passive battery equalization is relatively low, and the speed of battery equalization is slow. It takes repeated battery equalization to achieve the effect

[0007] 2. When the battery is balanced, the high-voltage battery module discharges, loses energy, heats up the resistor, and the battery heats up, causing damage to the battery and affecting battery life

That is to say, the battery management system using the above-mentioned battery balancing method is far from the theoretical value, and the system battery balancing still cannot achieve the desired effect, and the customer needs to use the lithium battery for a period of time before returning to the manufacturer for manual battery balancing.

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