Battery voltage equalization device

A technology for equalizing equipment and battery voltage, applied in battery circuit devices, secondary battery repair/maintenance, collectors, etc., can solve problems such as inconvenient replacement, many fault points, increased loss of high-voltage batteries, etc., and shorten battery life Effect

Inactive Publication Date: 2019-05-17
BEIJING KINGLONG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] (3) There are many components, it is inconvenient to replace, and there are many fault points
[0014] In summary, the above two methods will consume the energy of the high-voltage battery, increase the loss of the high-voltage battery, and may cause the consumption of battery charge and discharge.

Method used

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Embodiment Construction

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of 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.

[0040] The invention provides a battery voltage equalization device, which is used for voltage equalization of batteries in a battery pack, such as image 3 Shown is the circuit schematic diagram of the battery voltage equalization equipment provided by the present invention, the battery pack includes N batteries connected in series, and the charge cut-off voltage U of each battery (the charge cut-off voltage refers to that the battery reaches The voltages in ...

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Abstract

A battery voltage equalization device is used for voltage equalization of batteries in a battery pack, and the respective batteries have an equal charge cutoff voltage U. The battery voltage equalization device comprises N+1 switches, an isolated bidirectional DCDC converter and a battery management system, wherein the isolated bidirectional DCDC converter has an energy storage unit, the input/output voltages of the isolated bidirectional DCDC converter are respectively N*U and U, and the battery management system is configured to monitor the voltage of each battery in real time, further determine whether the voltage of each battery is higher than "U-0.03V" when batteries with unbalanced voltages are detected, stops working if so, otherwise calculating the absolute value (FORMULA referred)of the difference between the voltage U' of each battery with unbalanced voltage and the average voltage (FORMULA referred) of N batteries, arranging all the batteries with unbalanced voltages into asequence S in the order of large to small, and charging or discharging the batteries to be equalized in the sequence S respectively by a battery management system according to the condition of under-voltage or over-voltage.

Description

technical field [0001] The invention relates to the field of battery voltage equalization, in particular to a battery voltage equalization device. Background technique [0002] Currently, there are two commonly used battery voltage equalization methods: [0003] (1) Static balance method of battery resistance energy consumption [0004] like figure 1 Shown is a circuit diagram of a static equalization method using battery resistor energy dissipation, which uses a resistor and a switch in parallel with each battery. When charging, if the BMS (Battery Management System, battery management system) detects that the voltage of a certain battery is too high, it will turn on the corresponding switch. By discharging the battery with high voltage, the rest of the batteries can be charged for time until all the batteries are fully charged. It can be seen that this method cannot supplement the consumption of the low-voltage battery, and can only prolong the charging time by dischar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42
CPCY02E60/10
Inventor 张跃平武迎春许鹏志崔大龙张丽丽
Owner BEIJING KINGLONG NEW ENERGY TECH
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