Unlock instant, AI-driven research and patent intelligence for your innovation.

Battery balancer using multi-winding transformer

A multi-winding transformer and battery equalization technology, which is applied to charge equalization circuits, multiple synchronous battery arrangements, battery circuit devices, etc., can solve the problems of leakage inductance energy waste, poor reliability, and increased voltage and current stress of switching devices, etc., to achieve The effect of reducing cost and volume, halving the quantity, and reducing design difficulty

Inactive Publication Date: 2018-12-07
CENT SOUTH UNIV
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The equalizer topology proposed in [1] requires an additional reset circuit to increase the overall cost and volume, and the reset circuit needs to be precisely configured to achieve the desired effect.
In addition, this structure cannot be modularized. For a series battery pack with a large number of single cells, a particularly large number of windings is required, making the equalizer bulky and poor in reliability.
[0013] [2] It is proposed that the leakage inductance of the equalizer cannot be utilized, and the energy of the leakage inductance will be wasted. At the same time, the voltage and current stress of the switching device will be increased to endanger the safety of the switching device. In order to reduce the leakage inductance, the difficulty of transformer design will increase

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Battery balancer using multi-winding transformer
  • Battery balancer using multi-winding transformer
  • Battery balancer using multi-winding transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1: The transformer used for single-module equalization is to wind a coil with the same number of turns on a magnetic core. Every two batteries share one winding, and the direction of the same terminal is the same. Each battery uses a MOSFET switching device, using complementary and A switching signal with a duty cycle of 0.5 drives all MOSFETs.

Embodiment 2

[0051] Embodiment 2: Module equalization includes multi-module equalization; multi-module equalization can achieve common equalization of multiple modules by adding an extra winding to the transformer and connecting the extra windings of different modules in parallel.

[0052] The windings of the transformer are shared between two adjacent units and the leakage inductance is used efficiently; all MOSFETs are driven by a pair of complementary control signals and energy can be transferred automatically from the higher voltage unit to the lower voltage unit without Use any sampling circuit; moreover, the number of batteries (odd number or even number, single module or multi-module) and the state of the battery string (charge and discharge state, idle state) will not affect the work of the equalizer, so it has wide applicability ; in short, the proposed equalizer is very suitable for long series battery packs.

[0053] like Figure 5 and Image 6 , showing the equalization resul...

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

No PUM Login to View More

Abstract

The invention relates to the technical field of battery balancers, in particular to a battery balancer using a multi-winding transformer. The battery balancer using the multi-winding transformer comprises a transformer of the battery balancer, and the battery balancer is used for adapting to the application of a series battery pack with more single battery numbers through a module balancer; the module balancer comprises a single-module balancer; the single-module balancer adopts a transformer which is a coil with the same number of turns wound on a magnetic core, one winding is shared by everytwo batteries, the same-name ends are consistent in direction, and each battery uses one MOSFET switch device, and all the MOSFETs are driven by switch signals which are complementary and have a dutyratio of 0.5. According to the invention, automatic transformer magnetic core resetting can be realized, and no extra reset circuit is needed; the overall efficiency is improved, the risk of the switch device is reduced, and meanwhile, the requirements for leakage inductance and excitation inductance are reduced, and the design difficulty of the transformer is reduced.

Description

technical field [0001] The invention relates to the technical field of battery equalizers, in particular to a battery equalizer utilizing a multi-winding transformer. Background technique [0002] 1. Lithium-ion batteries have become one of the most common rechargeable batteries due to their advantages such as low self-discharge rate, high energy density, high battery voltage and no memory effect. In order to meet the requirements of high voltage and large capacity, a large number of lithium-ion battery cells are connected in series and parallel to form a battery pack. However, manufacturing tolerances and environments can cause variations in the capacity and internal resistance of battery cells. Worse, this inconsistency amplifies with repeated charging and discharging. Once any cell reaches the charge / discharge cut-off voltage, the entire battery pack stops functioning, which leaves the other cells underutilized. Therefore, a battery equalizer is required to fully utili...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0019
Inventor 粟梅刘福临孙尧刘永露王辉
Owner CENT SOUTH UNIV