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Battery management system and method for rapidly charging battery pack of electric bicycle

A battery management system, electric bicycle technology, applied in electric vehicles, battery circuit devices, safety/protection battery circuits, etc., can solve the problems of inability to control voltage and current, excessive charging current detection voltage, inapplicability, etc., to avoid high temperature damage Or burn out, prolong the service life, and ensure the effect of consistency

Inactive Publication Date: 2016-08-17
BEIJING FLASH CHARGE NETWORK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this approach is that since the charge and discharge detection share a current-sense resistor, when the charge current is much greater than the discharge current, it will not be possible to select a suitable resistance value
[0009] However, when this solution is applied to high-current and high-rate charging, there are often some inapplicable situations:
[0010] 1. Since the current detection method of this type of scheme is basically detected by the current detection resistor connected in series on the discharge circuit, when the charge and discharge current gap is too large, if the current detection resistor is set too large, the corresponding charge current detection voltage may be reduced. Exceeding the single-chip ADC range, or the discharge current cannot be accurately detected due to the setting of the current-sensing resistor is too small, and one of the main functions of this type of battery management system solution is to perform SOC calculation, and the detection error of the discharge current will greatly affect the SOC calculation
[0011] 2. Since this type of solution is the same as the solution described in the prior art 1, it uses a general-purpose switching power supply or a voltage-limiting and current-limiting power supply for charging, so the voltage and current during the charging process cannot be controlled according to the battery condition, and it is impossible to target different Optimized charging control based on battery characteristics
This method is more accurate when the battery condition is good, but when the battery condition declines, the actual capacity cannot reach the preset value after the battery is set to 100%, and the capacity calculation result will be larger than the actual value.

Method used

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  • Battery management system and method for rapidly charging battery pack of electric bicycle
  • Battery management system and method for rapidly charging battery pack of electric bicycle
  • Battery management system and method for rapidly charging battery pack of electric bicycle

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Embodiment Construction

[0054] The structural block diagram of the embodiment of the present invention is as figure 2 As shown, it mainly includes two parts: sampling and charging control module, and discharging control module. In this embodiment, an equalization module is added in order to balance the charge and discharge of the battery better. The three modules are implemented in the form of a circuit board, and are connected to the battery pack through each connecting pin. When the management system of the present invention is in use, it is first necessary to connect each node of the battery pack to each sampling point of the battery management system in sequence, and connect the discharge positive and negative poles of the battery pack to the wires that can adapt to the maximum charging and discharging current of the battery pack. The power node of the battery management system is connected to connect the power output node of the battery pack to the load or charger that needs the battery pack t...

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Abstract

The invention provides a battery management system for rapidly charging a battery pack of an electric bicycle. The battery management system is used for managing and controlling the battery pack and a charging machine for charging the battery pack. The battery management system comprises a sampling and charging control module and a discharging control module. The invention further provides a battery pack charging and discharging management method. The battery management system can manage battery charging and discharging more accurately and efficiently under the large current charging condition, and determination of the battery capacity can be more accurate. Besides, the battery management system designs a more reasonable charging process for high rate charging, the charging effect is better, and the charged electric quantity is more.

Description

technical field [0001] The invention relates to the field of electrical control, in particular to a management system and a corresponding method for BMS management of a battery pack of an electric vehicle. Background technique [0002] As the demand for mobile devices and energy storage power sources increases, the use of lithium batteries as energy sources is becoming more and more common. Due to the limitation of the electrolyte composition of the lithium battery, in order to maintain its service life and charging safety, the charging rate of the general lithium battery is controlled at about 0.3 ~ 1C. It takes about 1 to 3 hours to charge a fully discharged lithium battery at such a charging rate. The commonly used battery management system (BMS) often takes the charging rate of not more than 1C as the management target in the charging management link. [0003] The new lithium titanate battery breaks through the charging rate limit of traditional lithium batteries, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0013H02J7/0014H02J7/0019H02J7/0021H02J7/0026H02J7/0048H02J2007/0067Y02E60/10
Inventor 施亮井铁军张晖
Owner BEIJING FLASH CHARGE NETWORK TECH CO LTD
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