Power battery group management system with internal resistance monitoring function
A power battery pack and management system technology, applied in the field of power battery pack management system, can solve problems such as difficult to guarantee the accuracy of voltage measurement, complex load characteristics, and harmonics affecting the accuracy of voltage sampling, etc.
Pending Publication Date: 2016-07-13
赵建和
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Problems solved by technology
In this method, the engine of a hybrid vehicle is used as the discharge load during the battery internal resistance measurement process. The inverter and the engine in the discharge circuit cause the discharge circuit to include capacitive loads, switch loads, and motor inductive loads. The load characteristics are complex and unstable. , The harmonics generated by switching loads affect the accuracy of voltage sampling. Capacitive loads and inductive loads cause a phase difference between the voltage and current in the discharge circuit, which affects the corresponding relationship between voltage and current sampling in time, and the measurement of voltage and current Accuracy is difficult to guarantee
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[0050] In this embodiment, a power battery pack composed of 16 single lithium batteries connected in series is taken as an example to illustrate specific implementation steps of the present invention. The single lithium battery used has a capacity of 30Ah, a rated discharge current of 30A, a maximum discharge current of 60A, a charging current of less than 15A, a charging cut-off voltage of 4.2V, and a discharge cut-off voltage of 3.0V. Power battery pack output voltage: 48-67.2V. In this embodiment, 16 single cells are divided into 2 battery modules, see Figure 5 , Correspondingly set up 2 voltage detection modules, 2 temperature detection modules and 2 isolation modules.
[0051] Both voltage detection module A and voltage detection module B use the MAX11068 battery detection integrated circuit chip produced by MaximIntegrated, and the isolation module A and isolation module B use the ADuM1250 bidirectional I2C isolation interface integrated circuit produced by AnalogDevic...
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The invention discloses a power battery group management system with an internal resistance monitoring function. On the basis of real-time detection of a voltage, a current and a temperature of a battery group, voltages of all single batteries, and charging and discharging electric quantities, on-line rapid detection of direct-current internal resistances of all single batteries in the power battery group can be realized by using an instantaneous direct-current discharging measurement method; changing processes of internal resistances of all single batteries of the power battery group during the repeated charging and discharging usage processes are recorded; and security of the power battery group during the charging and discharging processes is guaranteed.
Description
technical field [0001] The invention relates to a power battery group management system with internal resistance monitoring function, which is used to detect the state of each single battery in the power battery group during charging and discharging, and is especially suitable for power batteries composed of lithium rechargeable batteries connected in series. Group management. Background technique [0002] Power battery packs are widely used in electric vehicles and energy storage systems for wind power generation and photovoltaic power generation. The battery management system, called BMS (Battery Management System) in the industry, is a comprehensive electronic control system that detects the working status of the battery during the charging and discharging process in real time, controls the charging and discharging process, and provides guarantee for the safe use of the battery. [0003] The well-known battery management system (BMS) detects the charging and discharging ...
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Login to View More IPC IPC(8): G01R31/36G01R27/02H01M10/42H01M10/48
CPCG01R27/02G01R31/382H01M10/425H01M10/48H01M10/486H01M2010/4271Y02E60/10
Inventor 赵建和
Owner 赵建和