Multiple step type battery control system in use for hybrid powered car

Abstract

The control system includes battery control module (BCM) and battery signal collection module (BSCM). BSCM collects signals of voltage and temperature of single battery, and implements data processing. The processed data are sent to BCM. Reducing wires for connecting single battery to the battery controller, the invention can monitor voltage and temperature of single battery precisely in all its aspects, and reduces workload of central processor in the battery control system.

Description

technical field [0001] The invention relates to a battery control system of an electric vehicle or a hybrid vehicle, which collects and processes signals such as voltage and temperature of the battery pack in real time. Background technique [0002] The power battery used in hybrid electric vehicles or pure electric vehicles consists of multiple battery cells connected in series. During the use of the battery, the battery control or control system must collect the voltage and temperature of the battery cells in real time. The traditional approach is to adopt a centralized control method, that is, the battery control system obtains the voltage and temperature values ​​of the battery cells through multiple signal harnesses. As the number of battery cells increases, the battery controller needs to provide more interface resources, and at the same time increase A large number of wiring harnesses also increases the difficulty of battery cell fault diagnosis. [0003] Hybrid bat...

AI Technical Summary

Problems solved by technology

[0003] Hybrid batteries generally use nickel-metal hydride batteries and lithium-ion batteries. Nickel-metal hydride batteries are more widely used, and their main advantages are low price, high safety, and mature technology; while lithium-ion batteries are mainly used in better environments such as laptops or mobile phones. For hybrid vehicles, the safety and economy of lithium-ion batteries must be improved. In order to improve the safety of lithium-ion batteries, the voltage and temperature of battery cells must be kept strictly consistent. Centralized control methods are used to control lithium-ion batteries for vehicles. Implementation management is technically difficult to guarantee,

[0004] The existing Ni-MH battery control system adopts a centralized scheme, as shown in Figure 1. The centralized scheme refers to the use of a controller to realize the acquisition of multiple signals and the prediction and control of battery performance. The centralized battery control controller adopts a scanning The AD signal processing of multi-channel analog signals cannot be realized at the same time, and when the voltage changes and fluctuates rapidly, the battery acquisition signals will have large inconsistencies, which will affect the performance of the battery. consistent forecast

[0005] During the charging and discharging process of the battery, the battery control system needs to collect the voltage of the battery cell and the temperature of the battery pack to monitor the balance of the battery cell and predict the battery performance and battery capacity. If these analog signals are input to the battery control controller, it will Consumes many hardware resources of the battery control controller and increases the load on the control chip

When a battery fails, it is not easy for maintenance personnel to locate and search; Figure 1 is the current centralized battery control system, the signal connection diagram between the battery management controller and the battery cell, as shown in Figure 1, the centralized battery control system The electrical interface requires a large number of wiring harnesses for connection. Setting too many voltage signal acquisition harnesses 2 and temperature signal acquisition harnesses 1 not only increases the difficulty of battery maintenance, but also increases the difficulty of battery air duct design. The increase in wiring harnesses will occupy the air duct Space

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