CN204118209U

CN204118209U - Series battery feasible type capacitive equalizer

Info

Publication number: CN204118209U
Application number: CN201420341562.8U
Authority: CN
Inventors: 茹世祥; 李勇
Original assignee: TAIYUAN AOSHENHUA ELECTRICAL EQUIPMENT MANUFACTURING Co Ltd
Current assignee: TAIYUAN AOSHENHUA ELECTRICAL EQUIPMENT MANUFACTURING Co Ltd
Priority date: 2014-06-25
Filing date: 2014-06-25
Publication date: 2015-01-21
Anticipated expiration: 2024-06-25

Abstract

The utility model relates to field of batteries, is a kind of feasible type capacitive equalizer.By inputting the efficient combination of connector, fuse, electronic switch, electrical energy transfer carrier electric capacity and external connection line, reduce the internal resistance in carrier capacitor charge and discharge loop as far as possible, with the equilibrium in the fastest velocity interpolation battery pack between each cell, to extend the useful life of battery pack.

Description

Series battery feasible type capacitive equalizer

Technical field

The utility model relates to field of batteries, is a kind of relevant safe balancing technique balanced to series battery.

Background technology

Conventional serial battery equalizer can be divided into resistance consumption, electric capacity transmission, transformer and inverse type four class substantially.Wherein simple with resistance consumption type, but it is cost with the energy storage of continuous high energy consumption battery, high energy battery dressed to low-yield battery, and reaches balanced object; And electric capacity transmission type is constantly delivered on low-yield battery by low consumption electric capacity by the energy storage of high energy battery, make the charge capacity of cell to mean value by cage, thus realize the equilibrium between series battery cell; Best from balanced general effect transformer type equalizer, but be difficult to control to the leakage inductance of manufactured transformer, cause portfolio effect not good enough; Drift energy between monomer can be fed back to some monomer in battery pack or group with prestissimo by inverse type equalizer, discharge and recharge dynamic equalization can be realized, it has higher researching value and use value, so far people should make great efforts to improve inversion efficiency, and reduce costs, but currently also there are some impassable difficulties at components and parts this respect.

Tradition capacitive equalizer schematic circuit only has switch, electric capacity and line internal resistance sum, principle exists a lot of defect: not containing input connector, when equalizer damages, and is difficult to block with battery open, also brings great trouble to maintenance; Not containing cell input insurance, when equalizer short circuit, because there is no open circuit protection, the cell of short circuit joint certainly will to be burnt; Not containing external connection line, make equalizer and battery pack can not be away from, cause operational inconvenience.

Summary of the invention

The utility model is to solve safety equilibrium in electric quantity balancing process between series battery cell, and a kind of series battery feasible type capacitive equalizer provided.

In order to solve the problem, the utility model in the following way:

Series battery feasible type capacitive equalizer, comprise the single-pole double-throw switch (SPDT) identical with cell quantity in series-connected cell electric power storage group and electric capacity, the two ends of single-pole double-throw switch (SPDT) are connected with the two ends of cell in batteries respectively, be connected with an electric capacity between the cutter of adjacent two single-pole double-throw switch (SPDT)s, in the middle of each battery and single-pole double-throw switch (SPDT), have a tandem compound inputting connector, fuse and external connection line.Main circuit adopts end to end closed loop, and outermost battery system is from the line of connector and fuse, and centre is switching tube and corresponding components and parts, and innermost layer is electrical energy transfer electric capacity.

The utility model is by the efficient combination of input connector, fuse, electronic switch, electrical energy transfer carrier electric capacity and external connection line, reduce the internal resistance in carrier capacitor charge and discharge loop as far as possible, with the equilibrium in the fastest velocity interpolation battery pack between each cell, this is very fruitful to the useful life of prolongation battery pack.

1) each cell input connector, can make equalizer and battery pack can disconnect rapidly when needed, greatly facilitates debugging, installs and maintenance.

2) each cell input fuse, burns series battery when can prevent equalizer from damaging, and when the genuine short circuit of equalizer, short circuit current, first by blowout, reaches the object disconnecting battery pack, and this just protects cell effectively.

3) each cell input connecting line, increases connecting line wire diameter, makes connecting line internal resistance as far as possible little.

Accompanying drawing explanation

Fig. 1 is conventional capacitive charging and discharging circuit internal resistance schematic diagram;

Fig. 2 adds internal resistance schematic diagram after connector, fuse and external connection line.

Embodiment

B ₁, B ₂, B ₃... B _nfor series battery, S ₁, S ₂, S ₃... S _nfor single-pole double throw electronic switch, its cutter is defined as node, connects n electrical energy transfer electric capacity C between two adjacent nodes of cutter in order respectively ₁₂, C ₂₃, C ₃₄... C _{(n-1) n}, and two ends are cross over n battery B respectively in order ₁, B ₂, B ₃... B _nnegative pole and positive pole on.When each switch is placed in " 1 " position, transmit electric capacity C ₁₂-C _{(n-1) n}fill battery B respectively with ₁-B _(n-1)voltage, when each switch is placed in " 2 " position, transmit electric capacity C ₁₂-C _{(n-1) n}respectively to battery B ₂-B _nelectric discharge, the electric energy completed between neighboring unit cell exchanges.As shown in the figure, the internal resistance of conventional capacitive charging and discharging circuit is , after adding connector, fuse and external connection line, internal resistance is .

Equivalent series resistance is mainly derived from electric capacity, therefore choosing of capacity type becomes crucial, CL electric capacity is selected at the balance tangent loss angle (can be equivalent to series resistance) of various electric capacity and the basis of cost, it is 0.01 comparatively suitable that tangent loss angle is less than, coordinate other components and parts again, form three ranks (seeing the following form) of capacitive equalizer.

Project	Electric capacity kind	Tangent loss angle	?	Equal series resistance	Equilibrium after three discharge and recharges is poor
						1 grade	CBB	0.001	?	50mΩ	20mV
2 grades	CL or low consumption electrolysis	0.01	?	100mΩ	50mV
						3 grades	General electrolysis	0.1	?	150mΩ	100mV

The tangent loss angle of the equalizer Main Basis electrical energy transfer electric capacity of three ranks divides as can be seen from the above table, namely loss determines balanced grade, 1-3 level is CBB, CL or low consumption electrolysis and general electrochemical capacitor respectively, and tangent loss angle is respectively 0.001,0.01 and 0.1; Equivalent series resistance is respectively 50m Ω, 100m Ω and 150m Ω; After three charge and discharge cycles, the balanced difference of cell is not less than 20mV, 50mV and 100mV.

Contrast tangent loss angle from rank and project less, equivalent series resistance is less, and the equilibrium difference of acquisition is also less, and this just means that series battery feasible type capacitive equalizer effectively can extend the useful life of series battery.

Embodiment one

Select 4 × 12V, the battery of electric bicycle of 10Ah, the basis of ideal circuit introduce input connector, fuse and external connection line:

1. connector: select 16 core 1050 type connectors, object is easy to install and maintain, and when accidents happened, can disconnect rapidly.

2. fuse: select 10A quick break fuse, when fault, fuse blows immediately, each cell of protection series battery.

External connection line: select 3mm ²line, reduce connection resistances as far as possible, improve equalization efficiency.

Claims

1. series battery feasible type capacitive equalizer, comprise the single-pole double-throw switch (SPDT) identical with cell quantity in series-connected cell electric power storage group and electric capacity, the two ends of single-pole double-throw switch (SPDT) are connected with the two ends of cell in batteries respectively, an electric capacity is connected with between the cutter of adjacent two single-pole double-throw switch (SPDT)s, it is characterized in that: in the middle of each battery and single-pole double-throw switch (SPDT), have one to input connector, fuse, with the tandem compound of external connection line, main circuit adopts end to end closed loop, outermost battery system is from the line of connector and fuse, centre is switching tube and corresponding components and parts, innermost layer is electrical energy transfer electric capacity.