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Double-capacitor circuit design for active equalization of battery and equalization method thereof

A technology of active equalization and circuit design, which is applied in the direction of charge equalization circuit, battery circuit device, arrangement of multiple synchronous batteries, etc., can solve problems such as equalization current damage to circuit components, and achieve the effect of solving excessive equalization current

Active Publication Date: 2020-12-11
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention discloses a dual-capacitor circuit design method and its equalization method for battery active equalization, by limiting the equivalent resistance R of the circuit when capacitors are charged in parallel 1 And the equivalent resistance R of the capacitor series discharge circuit 2 The relationship between the two capacitors and the two capacitors satisfy the same electrical characteristics, and the peak current I of the capacitor charging and discharging after the circuit balance enters the steady state is obtained. max And the non-repetitive pulse maximum current I in the whole equalization process of the circuit ch_p1 The expression, through the I max and I ch_p1 The conditions that need to be met reverse the parameter values ​​of each component in the circuit and the initialization time of capacitors in series, thus solving the problem that the equalization current is too large to damage the circuit components during the equalization process of the dual-capacitor circuit

Method used

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  • Double-capacitor circuit design for active equalization of battery and equalization method thereof
  • Double-capacitor circuit design for active equalization of battery and equalization method thereof
  • Double-capacitor circuit design for active equalization of battery and equalization method thereof

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Embodiment 1

[0077] The dual-capacitor circuit design method for battery active balancing of the present invention corresponds to Embodiment 1 as follows: set the expected average value of the balancing current as Take ξ=0.5, then the maximum current Take the minimum rated current I of all components in the circuit N =3A, battery internal resistance R b =0.004Ω, the resistance R of the primary switch sw = 0.1Ω, capacitor C 1 and C 2 The equivalent resistance R c = 0.2Ω, capacitor C 1 and C 2 The capacitance C=47μF, the resistance R reg1 =0Ω, then R 1 =4.5R sw +R b +0.5R c +R reg1 =0.554Ω, according to V H =3.738V, V L = 3.547V calculated not satisfied max >I 0 requirements, below to adjust the switch resistor R sw Realize the design of a two-capacitor circuit:

[0078] Reselect switch R with smaller internal resistance sw =0.08Ω, then R 1 = 0.464Ω, I max =2.636A, satisfy I max >I 0 requirements;

[0079] At this time, I max N requirements are also met;

[0080...

Embodiment 2

[0086] Embodiment 2 corresponding to the dual-capacitor circuit design method for battery active balancing of the present invention is as follows: the initial parameters of the circuit components in Embodiment 2 and Embodiment 1 are consistent, and the difference is that Embodiment 2 adopts the method of adjusting the switch resistance R sw and resistance R reg1 Realize the circuit design.

[0087] Set the desired average value of the equalization current as Take ξ=0.5, then the maximum current Take the minimum rated current I of all components in the circuit N =3A, battery internal resistance R b =0.004Ω, the resistance R of the primary switch sw = 0.1Ω, capacitor C 1 and C 2 The equivalent resistance R c = 0.2Ω, capacitor C 1 and C 2 The capacitance C=47μF, the resistance R reg1 =0Ω, then R 1 =4.5R sw +R b +0.5R c +R reg1 =0.554Ω, according to V H =3.738V, V L = 3.547V calculated not satisfied max >I 0 requirements, adjust the switch resistor R below ...

Embodiment 3

[0095] The dual-capacitor circuit design method for battery active balancing of the present invention corresponds to Embodiment 3 as follows: The difference between Embodiment 3 and Embodiment 2 is that the expected average value of the equalizing current will be determined. The setting is smaller, and the initial parameters of other electrical components remain unchanged. In the third embodiment, the equivalent resistance of the capacitor is adjusted to realize the circuit design.

[0096] Set the desired average value of the equalization current as Take ξ=0.5, then the maximum current Take the minimum rated current I of all components in the circuit N =3A, battery internal resistance R b =0.004Ω, the resistance R of the primary switch sw = 0.1Ω, capacitor C 1 and C 2 The equivalent resistance R c = 0.2Ω, capacitor C 1 and C 2 The capacitance C=47μF, the resistance R reg1 =0Ω, then R 1 =4.5R sw +Rb +0.5R c +R reg1 =0.554Ω, according to V H =3.738V, V L = 3.5...

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Abstract

The invention discloses a double-capacitor circuit design for active equalization of a battery and an equalization method thereof, and the method comprises the following steps: S1, employing an equivalent resistor R1 of a circuit when capacitors are charged in parallel and an equivalent resistor R2 of the circuit when the capacitors are discharged in series to meet the condition that R2 = 2R1, andenabling the two capacitors to meet the same electrical characteristics, obtaining a peak current Imax of capacitor charging and discharging after the circuit equalization enters a steady state and an expression of a non-repetitive pulse type maximum current Ich_p1 in the whole equalization process of the circuit; S2, determining a resistance value of each circuit component according to the condition that the peak current Imax is greater than I0 and less than IN; and S3, limiting the capacitor series initialization time t before the circuit enters the equalization period to realize that the non-repetitive pulse type maximum current Ich_p1 meets the condition that Ich_p1 is less than k0IN. According to the invention, the parameter values of all components in the circuit and the capacitor series initialization time length are reversely deduced according to the conditions that Imax and Ich_p1 need to meet; therefore, the problem that circuit components are easily damaged due to overlargeequalization current in the equalization process of the double-capacitor circuit is solved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a dual-capacitor circuit design for battery active balancing and a balancing method thereof. Background technique [0002] In emerging fields such as new energy vehicles and power system energy storage, energy storage batteries are key components, which cannot be managed without a battery management system (BMS). The battery equalization circuit realizes the balance of the power between the internal cells of the battery, and undertakes a very important function. The existing equalization circuit structure can be divided into two categories: passive equalization and active equalization. The passive equalization method achieves equalization through the discharge of high-power cells through resistance, which is not conducive to energy saving. The active equalization method uses energy storage components such as inductors (transformers) and capacitors to realize energy transfer b...

Claims

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Application Information

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IPC IPC(8): H02J7/00B60L58/22
CPCH02J7/0014H02J7/0019H02J7/0024B60L58/22Y02T10/70
Inventor 陈海进刘明瑞
Owner NANTONG UNIVERSITY