A method for balancing battery cell voltage in a battery pack system
A technology for battery cells and battery packs, which is applied to charge balancing circuits, battery circuit devices, and arrangement of multiple synchronous batteries, etc., can solve the problems of small balancing current and cannot be supplemented with low-capacity cells, and achieve simple control. , good real-time performance, and the effect of improving the capacity of the whole group
Active Publication Date: 2020-10-09
JIANGSU ROTHWELL ELECTRIC
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] Passive equalization is to connect a switchable discharge resistor in parallel with each string of batteries. BMS controls the discharge resistor to discharge the cells with higher voltage, and the electric energy is dissipated in the form of heat. This method can only discharge cells with high voltage. , it is not possible to supplement the low-capacity monomers, and the balance current is generally small due to the power limit of the discharge resistor.
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] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0018] Such as figure 1 As shown, a battery pack system includes 6 battery cells B1 to B6, and each battery cell Bx (x is a number from 1 to 6) is provided with an insurance FUx and a controllable MOS switch one by one. The tube Sx and a balancing capacitor Cx, all the balancing capacitors Cx are capacitors of the same specification, are connected in series in the circuit to form a voltage d...
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 relates to a method for balancing the battery cell voltage of a battery pack system, comprising the following steps: step 1) pre-judgment; step 2) pre-charging; step 3) equalization; step 4) end; step 1) is: BMS judgment Whether it is necessary to equalize the voltage of each battery cell in the battery pack system, the default setting is to enable equalization when the power is turned on, or to enable equalization when Δu>=set threshold value; Δu represents the maximum value of the voltage value of each battery cell and The difference between the minimum values. The method for balancing the battery cell voltage of the battery pack system provided by the present invention adopts the inherent characteristics of the circuit to maintain the balance in a dynamic process. The whole process only needs to be fixed and turned on several thyristor switches at the beginning stage, which saves CPU resources, good real-time performance, simple control, safe and reliable, good stability, can stabilize all battery cells at the same time near the ideal value U / 6, maximize the capacity of the whole group, and can well meet the practical application needs.
Description
technical field [0001] The invention belongs to the technical field of battery pack system management, and in particular relates to a method for balancing the voltage of battery cells in a battery pack system. Background technique [0002] In a battery pack system connected in series, it is necessary to ensure that each battery cell in the battery pack has a certain service life, which requires the voltage of any single cell to be within a reasonable range. This actually reflects the capacity of the battery cell to a certain extent. When a battery cell with a small capacity is fully charged or discharged, its voltage will rise or fall sharply, exceeding the specified voltage range. BMS ( That is, the BATTERY MANAGEMENT SYSTEM, the battery management system) needs to cut off the high voltage and prohibit the charging and discharging of the system to ensure that the monomer will not be damaged. reduction in capacity. Therefore, the capacity of the entire battery pack system ...
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): H01M10/42H01M10/46H02J7/00
CPCH01M10/4207H01M10/4264H01M10/46H02J7/0019H01M2010/4271Y02E60/10
Inventor 周祥东黄雁王秋生
Owner JIANGSU ROTHWELL ELECTRIC