A battery pack constant current constant voltage charging method
A charging method, a technology of constant current and constant voltage, applied in the direction of secondary battery charging/discharging, battery circuit device, secondary battery repair/maintenance, etc. The unbalance of the DC bus voltage and the effect of solving the reverse charging of the battery into the power grid
Active Publication Date: 2017-03-01
FOSHAN BAYKEE NEW ENERGY TECH INC
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
When the rectifier is bidirectionally controlled, the battery current may flow back into the power grid, resulting in a large current
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0017] A battery pack constant current constant voltage charging method, comprising the following steps:
[0018] S1, such as figure 1 As shown, the three-phase T-type three-level rectifier and the two battery packs BT1 and BT2 are connected in parallel between the positive and negative poles BUS+ and BUS- of the DC bus, and at the same time, the midpoint of the two battery packs BT1 and BT2 connected in series is grounded , so that the two battery packs BT1 and BT2 are respectively connected to the positive and negative poles BUS+ and BUS- of the DC bus through two static switches T4 and T5;
[0019] S2, close two static switches T4, T5;
[0020] S3. Use the Hall current sensors H4 and H5 to detect the charging current and the discharging current of the two battery packs BT1 and BT2 respectively, and select the voltage of a battery pack with a smaller battery voltage as the given voltage value of the DC bus;
[0021] S4. The three-phase T-type three-level rectifier detects ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for charging battery packs in a constant-current and constant-voltage manner. The method comprises the following steps of: S1, connecting a three-phase T-shaped triple-level rectifier and two battery packs between the positive pole and the negative pole of a DC bus in parallel in order that the two battery packs are connected with the positive pole and the negative pole of the DC bus through a static switch respectively; S2, switching off the two static switches; S3, selecting the voltage of the battery pack with lower voltage as a given voltage value of the DC bus; S4, adjusting a voltage value of the positive pole of the DC bus and a voltage value of the negative pole of the DC bus to be the same as the given voltage value of the DC bus; S5, switching on the two battery packs; S6, charging the batter pack with maximum charging current in a constant-current manner after slowly increasing the voltage values of positive pole and the negative pole of the DC bus; and S7, if the voltage value of the DC bus reaches a rated peak value, achieving constant-current charging of the two battery packs and then entering a constant-voltage charging state; if the voltage value of the DC bus does not reach the rated peak value, returning to the step S6. The method may charge the two battery packs in the case of balanced positive pole and the negative pole of the DC bus.
Description
technical field [0001] The invention relates to a charging method, in particular to a constant current and constant voltage charging method for a battery pack. Background technique [0002] Such as figure 1 As shown, the current online UPS power supply that uses two sets of positive and negative batteries is to use two sets of the same battery set in series, and the midpoint is grounded to provide backup power, so that the three-level IGBT bridge rectification method can be conveniently used The formed rectifier generates a DC bus voltage, and the battery packs BT1 and BT2 can be directly connected in parallel to the DC bus. One part of the DC bus is to provide the input of the back-end inverter, and the other part is to charge the battery pack. Usually, the control method of constant current and then constant voltage is adopted. [0003] In the above-mentioned UPS power supply, when charging the battery pack with a constant current, it is necessary to detect the charging ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/10H01M10/44
CPCY02E60/10
Inventor 潘成罗蜂潘世高
Owner FOSHAN BAYKEE NEW ENERGY TECH INC