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Mixed mode battery equalization circuit
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A technology of battery equalization and mixed mode, which is applied in the direction of charge equalization circuit, battery circuit device, circuit device, etc. It can solve the problems of high power of DC converter and inflexible path of active equalization circuit, etc., so as to improve the equalization speed and equalization efficiency Effect
Active Publication Date: 2019-04-16
HARBIN INST OF TECH
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[0005] The invention provides a mixed-mode battery equalization circuit, which has the advantages of both the active equalization mode and the "smart" monomer mode. The equalization mode is flexible and changeable, and the equalization speed is fast, which overcomes the inflexibility of the existing active equalization circuit path. , "Intelligent" single-mode DC converter has the disadvantage of high power
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specific Embodiment approach 1
[0020] The "smart" monomer model, combined with figure 2 , taking 4 energy storage units as an example, by turning on or off the switching tube and bidirectional switch, the units can be in three states: direct connection, bypass, and power controllable. figure 2 , the bidirectional switch Q 4a , Q 4c always on, B 4 In direct connection state; bidirectional switch Q 3b , Q 3calways on, the switch tube S 3a , S 3b and inductance L 3 Form BuckBoost converter, B 3 In power controllable state, it can pass S 3a , S 3b Control B 3 The charge and discharge power of the switch tube S 2a , S 2b and a bidirectional switch Q 2c is always on, B 2 In bypass state; bidirectional switch Q 1a is always on, B 1 In direct connection state.
specific Embodiment approach 2
[0021] active equalization mode, combined with image 3 , taking 4 energy storage cells as an example, the switch tube S 1a , S 2a , S 3a , S 4a and a bidirectional switch Q 1a , Q 2a , Q 3a , Q 4a is always on, Q 4b is always in the off state, at this time the switch tube S 1b , S 2b , S 3b , S 4b sequentially connected in series. Inductance L 1 and a bidirectional switch Q 1b , Q 2c Consists of parts connected with S 1b drain and B 1 between positive electrodes, through Q 1b , Q 2c The on or off, can make the inductance L 1 In the state of access, short circuit, and disconnection, in order to form various forms of BuckBoost converters.
specific Embodiment approach 3
[0022] In the active balance mode, adjacent energy storage units perform energy balance, combining Figure 4 , when there are 4 energy storage cells, the cell B 1 with B 2 To balance, monomer B 3 and B 4 The situation of equalization is taken as an example to illustrate, and the unmentioned switch tubes and bidirectional switches are all in the off state.
[0023] Energy storage unit B 1 , B 2 , switch tube S 1a , S 1b , S 2a , S 2b , inductance L 1 and a bidirectional switch Q 1a , Q 1b , Q 2a , Q 3c Constitutes a BuckBoost converter, switching tubes and bidirectional switches except S 1b , S 2b outside are in the conduction state, by controlling the S 1b , S 2b The on-off of the monomer B can be realized 1 with B 2 Energy transfer between them, so as to achieve equilibrium. Similarly, energy storage unit B 3 , B 4 , switch tube S 3a , S 3b , S 4a , S 4b , inductance L 3 and a bidirectional switch Q 3a , Q 3b , Q 3c , Q 4a Constitute a BuckBoost...
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Abstract
The invention relates to a mixed mode battery equalization circuit and belongs to the technical field of power electronics. When the number of series energy storage units is n, the circuit includes ninductors, 2n switching tubes and (3n-1) bidirectional switches. The circuit has two modes of 'smart' unit and active equalization. In the 'smart' unit mode, each unit and a BuckBoost converter combination are connected in series, the charging and discharging power of the unit is controlled through the converter, therefore, the equalization is achieved, and the units can be directly connected or bypassed in the mode. In the active equalization mode, a part of the switching tubes and bidirectional switches are always turned on, other switching tubes and bidirectional switches can control the inductors to be in one of three states of open circuit, short circuit, and access, so BuckBoost converters are formed by a group formed by the unit and an adjacent unit, other adjacent units or groups and the inductors in a connected state, and the transfer of equalized energy is achieved. The equalization circuit can achieve more flexible and versatile equalization functions.
Description
technical field [0001] The invention relates to a mixed-mode battery equalization circuit, which belongs to the technical field of power electronics. Background technique [0002] The series energy storage group composed of energy storage units such as various batteries or supercapacitors is widely used in electric vehicles, new energy power generation and other fields. Due to the unavoidable differences among energy storage cells, it is very easy to overcharge or over-discharge one or some cells during series use. If the energy storage group is not balanced, the actual capacity will decrease, Therefore, the energy balance between energy storage bodies has always been one of the key technologies for the practical application of series energy storage. [0003] The most common approach is an active equalization method that uses a converter to transfer energy between series-connected energy storage bodies. In the active equalization method, most of them use inductance or coup...
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