CN110380493A - A kind of serial lithium battery equalizer circuit - Google Patents
A kind of serial lithium battery equalizer circuit Download PDFInfo
- Publication number
- CN110380493A CN110380493A CN201910809193.8A CN201910809193A CN110380493A CN 110380493 A CN110380493 A CN 110380493A CN 201910809193 A CN201910809193 A CN 201910809193A CN 110380493 A CN110380493 A CN 110380493A
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- China
- Prior art keywords
- type switch
- switch tube
- battery pack
- battery
- inductance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims abstract description 18
- 230000005611 electricity Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 230000001939 inductive effect Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
Abstract
The invention discloses a kind of serial lithium battery equalizer circuits comprising the lithium battery group being sequentially connected in series by even number at battery pack, high frequency multiport transformer, primary side half-bridge circuit and several secondary side half-bridge circuits；Primary side half-bridge circuit includes N type switch tube SA, N type switch tube SADrain electrode be connected respectively with the anode of battery pack and one end of capacitor C1；N type switch tube SASource electrode respectively with inductance LP1One end and N type switch tube SBDrain electrode be connected；N type switch tube SBSource electrode be connected respectively with one end of the cathode of battery pack and capacitor C2；The other end of capacitor C1 respectively with first siding ring TPOne end be connected with the other end of capacitor C2；First siding ring TPThe other end and inductance LP1The other end be connected.Circuit structure of the present invention is simple, at low cost, and the minimum voltage for avoiding single battery in lithium battery group influences battery pack available capacity.
Description
Technical field
The present invention relates to lithium batteries to press field, and in particular to a kind of serial lithium battery equalizer circuit.
Background technique
With the progress of battery the relevant technologies, lithium battery is excellent with its high-energy density, environmentally protective, memory-less effect etc.
Point, using more next in the energy storage link of new energy distributed type minisize power generating network, the occasions such as New-energy electric vehicle on-vehicle battery
It is more extensive.
Because the monomer voltage of lithium ion battery is relatively low, in practical applications, it is not able to satisfy high-power grade
Burden requirement needs to be connected into battery pack to a certain number of batteries to meet actual cell voltage demand.But it is constrained to existing
The manufacturing process in stage, along with the influence of the environment such as operating temperature, lithium ion battery will appear battery in the actual work
The inconsistent problem of the parameters such as capacity, equivalent internal resistance.
The voltage and residual capacity of each battery are influenced by its battery parameter.So battery in battery pack parameter
The inconsistent inconsistent and residual capacity that can directly make the cell voltage in the same battery pack it is inconsistent.Battery pack has
Effect capacity depends primarily on the single battery of minimum voltage in battery pack, so the pressure difference of monomer voltage is excessive in same battery pack
It will affect the service life and service efficiency of battery pack.
Summary of the invention
For above-mentioned deficiency in the prior art, a kind of serial lithium battery equalizer circuit provided by the invention solves lithium electricity
The minimum voltage of Chi Zuzhong single battery influences the problem of battery pack available capacity.
In order to achieve the above object of the invention, the technical solution adopted by the present invention are as follows:
A kind of serial lithium battery equalizer circuit is provided comprising the lithium battery group being sequentially connected in series by even number at battery
Packet, high frequency multiport transformer, primary side half-bridge circuit and several secondary side half-bridge circuits；Primary side half-bridge circuit includes N
Type switching tube SA, N type switch tube SADrain electrode be connected respectively with the anode of battery pack and one end of capacitor C1；N type switch tube SA
Source electrode respectively with inductance LP1One end and N type switch tube SBDrain electrode be connected；N type switch tube SBSource electrode respectively with battery
The cathode of packet is connected with one end of capacitor C2；The other end of capacitor C1 respectively with first siding ring TPOne end and capacitor C2
The other end is connected；First siding ring TPThe other end and inductance LP1The other end be connected；
Every two adjacent lithium battery forms a battery pack and a corresponding secondary side half-bridge circuit, m-th of secondary side
Half-bridge circuit includes N type switch tube S2m-1, N type switch tube S2m-1Drain electrode be connected with the anode of corresponding battery pack；N
Type switching tube S2m-1Source electrode be separately connected N type switch tube S2mDrain electrode and inductance LsmOne end；Inductance LsmThe other end and two
Secondary lateral coil TsmOne end be connected；Second siding ring TsmThe other end be connected to the positive and negative of two corresponding lithium batteries
Pole series line；N type switch tube S2mSource electrode be connected with the cathode of corresponding battery pack.
Further, first siding ring TPWith inductance LP1The one end being connected is Same Name of Ends；Second siding ring TsmWith inductance
LsmThe one end being connected is Same Name of Ends.
The invention has the benefit that circuit structure of the present invention is simple, at low cost, control mode is convenient, it can be achieved that battery
Energy transmission and former secondary side energy transmission between the interior energy content of battery transmitting of group, battery pack, can be to the battery of complicated voltage's distribiuting
Group is pressed, and the minimum voltage for avoiding single battery in lithium battery group influences battery pack available capacity.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention；
Fig. 2 is the operation schematic diagram that the present invention carries out the transmitting of battery pack self-energy；
Fig. 3 is the operation schematic diagram that the present invention carries out energy transmission between battery pack；
Fig. 4 is the operation schematic diagram that the present invention carries out former secondary side energy transmission；
Fig. 5 is the equivalent waveform diagram of work of the invention；
Fig. 6 is the current mode schematic diagram of operation mode 1 of the invention；
Fig. 7 is the current mode schematic diagram of operation mode 2 of the invention；
Fig. 8 is the current mode schematic diagram of operation mode 3 of the invention.
Specific embodiment
A specific embodiment of the invention is described below, in order to facilitate understanding by those skilled in the art this hair
It is bright, it should be apparent that the present invention is not limited to the ranges of specific embodiment, for those skilled in the art,
As long as various change is in the spirit and scope of the present invention that the attached claims limit and determine, these variations are aobvious and easy
See, all are using the innovation and creation of present inventive concept in the column of protection.
As shown in Figure 1, the serial lithium battery equalizer circuit include the lithium battery group that is sequentially connected in series by even number at battery
Packet, high frequency multiport transformer, primary side half-bridge circuit and several secondary side half-bridge circuits；Primary side half-bridge circuit includes N
Type switching tube SA, N type switch tube SADrain electrode be connected respectively with the anode of battery pack and one end of capacitor C1；N type switch tube SA
Source electrode respectively with inductance LP1One end and N type switch tube SBDrain electrode be connected；N type switch tube SBSource electrode respectively with battery
The cathode of packet is connected with one end of capacitor C2；The other end of capacitor C1 respectively with first siding ring TPOne end and capacitor C2
The other end is connected；First siding ring TPThe other end and inductance LP1The other end be connected；
Every two adjacent lithium battery forms a battery pack and a corresponding secondary side half-bridge circuit, m-th of secondary side
Half-bridge circuit includes N type switch tube S2m-1, N type switch tube S2m-1Drain electrode be connected with the anode of corresponding battery pack；N
Type switching tube S2m-1Source electrode be separately connected N type switch tube S2mDrain electrode and inductance LsmOne end；Inductance LsmThe other end and two
Secondary lateral coil TsmOne end be connected；Second siding ring TsmThe other end be connected to the positive and negative of two corresponding lithium batteries
Pole series line；N type switch tube S2mSource electrode be connected with the cathode of corresponding battery pack.
First siding ring TPWith inductance LP1The one end being connected is Same Name of Ends；Second siding ring TsmWith inductance LsmIt is connected
One end be Same Name of Ends.
In the specific implementation process, the equivalent waveform diagram of work of the invention is as shown in figure 5, equalizer circuit of the invention is topological
Essence is single inductor balancing and multiport DC-DC converter transmission energy.In various working conditions, show as three kinds it is different
Energy transmission mode.
As shown in Fig. 2, the first working condition is the transmitting of battery pack self-energy, the voltage of battery (or capacitor) is detected, such as
Cell voltage is higher than lower cell voltage on fruit, then opens the upper corresponding switching tube of battery in duty cycle time, upper battery is logical at this time
Cross inductive discharge, inductance energy accumulation, inductive current afterflow after duty cycle time, energy is discharged into the low lower electricity of voltage
Pond.Wherein in each battery pack single lithium battery anode as the battery pack anode that battery be upper battery, often
The cathode of single lithium battery is lower battery as that battery of the cathode of the battery pack in a battery pack.With complete in Fig. 1
For the secondary side half-bridge circuit (Module 1) drawn, battery B in figure1For upper battery, corresponding switching tube is switch
Pipe S1, battery B in figure2For lower battery, corresponding switching tube is switching tube S2。
As shown in figure 3, second of working condition energy transmission between battery pack, secondary side half-bridge circuit passes through high frequency multiterminal
Mouth transformer forms connection, and constituting a ratio is 1:1: ...: 1 multiport DC-DC converter.Synchronization cell voltage is high
In Circuit Fault on Secondary Transformer voltage battery pack to transformer discharge, transformer is lower than the battery pack of transformer voltage to cell voltage
Charging.After multiple periods, the cell voltage of each battery pack tends to be equal.
As shown in figure 4, the third working condition is the balancing energy of monomer and entirety, secondary side half-bridge circuit and primary side
Half-bridge circuit is connected together by high frequency multiport transformer, composition n:1: ...: 1 multiport DC-DC converter,
This point is different from the second way.The electric current of secondary side half-bridge circuit remains unchanged more by the cell voltage and high frequency of each battery pack
Port transformer voltage swing determines that primary side current is then with the sum of all battery pack currents of secondary side through high frequency multiport transformation
It is identical that device converts later value.The electric current of primary side carries out charge and discharge, realization pair to integral battery packet by upper and lower two buses
The exchange of integral battery packet energy.
In one embodiment of the invention, all secondary when transformer voltage is lower than all battery cell voltages
Side half-bridge circuit discharges to high frequency multiport transformer, thus the electric current of primary side half-bridge circuit is exactly all secondary side half-bridges
The sum of circuital current.Under this mode, the current flowing direction of entire topology is single fixation, is conducive to analysis, therefore herein
For in this mode, analyzed in conjunction with voltage current waveform and circuit modal graph.In order to allow all electricity inside such mode
Chi Jun is pressed onto average voltage, so only opening switching tube corresponding higher than the battery of average voltage.
As shown in fig. 6, operation mode 1: the upper battery in each battery pack in secondary side is detected, in t0Moment makes battery electric
Pressure is higher than the secondary-side switch pipe in the preceding j battery pack of average voltage and opens.At this point, primary side is corresponding to turn on the switch pipe SA, energy
Amount is flowed out by upper battery all in preceding j battery pack, gives inductance L by corresponding switching tubes1…LsjCharging, ils1…
ilsjLinear rise, while primary side, i are given energy transmission by high frequency multiport transformerLpLinear rise passes through switching tube SA
Energy is transmitted to whole battery pack.Also there is induced voltage V on the rear k winding on high frequency multiport transformer pair sideTS, but by
In transformer voltage ratio setting so that VTS<VBk1+VD, so Sk1Body diode will not be opened.Therefore there is no current path.This
Stage realizes transmission of the single battery energy to integral battery packet.
As shown in fig. 7, operation mode 2:t1Moment, preceding j odd bits switching tube S1…S2j-1With switching tube SAIt closes simultaneously
Disconnected, the energy stored on high frequency multiport transformer inductance passes through S respectivelyAWith preceding j odd bits switching tube S1…S2j-1It is anti-simultaneously
Join diode continuousing flow, primary side side passes through switching tube SADiode be released to integral battery packet, secondary side is opened by preceding j even bit
Close pipe S1…S2j-1Diode be released to and lower battery in corresponding group of upper battery of a upper periodic discharging.This stage, secondary side
Realize single inductor balancing in secondary side half-bridge circuit, primary side realizes inductance energy to whole transmitting.Although each secondary side
Half-bridge circuit due to respective cell voltage difference and make inductive discharge speed have speed, but with the propulsion of time, respectively
A secondary side half-bridge circuit all can in dead time slowly afterflow complete, in t2Moment all secondary side half-bridge circuits are completed continuous
Stream, only exciting current is also present in circuit.This stage realizes that inductance stores release of the energy to A-battery, actually single electricity
Feel the second half step pressed.
As shown in figure 8, operation mode 3: this stage is the freewheeling period of exciting current, due to high frequency multiport transformer
Work is exited, exciting current can only pass through capacitor C2, switching tube SBBody diode and primary inductor LP1Afterflow.By switching tube
SBVoltage clamping to zero, realize switching tube S at the t3 momentBSofe Switch.Start high-voltage battery in the lower half period and gives entirety electricity
Pond group and the energy release for organizing interior A-battery.
At low cost in conclusion circuit structure of the present invention is simple, control mode is convenient, it can be achieved that battery energy in battery pack
Amount transmitting, energy transmission and former secondary side energy transmission between battery pack, can the battery pack to complicated voltage's distribiuting pressed,
The minimum voltage for avoiding single battery in lithium battery group influences battery pack available capacity.
Claims (2)
1. a kind of serial lithium battery equalizer circuit, which is characterized in that including the lithium battery group that is sequentially connected in series by even number at electricity
Chi Bao, high frequency multiport transformer, primary side half-bridge circuit and several secondary side half-bridge circuits；The primary side half-bridge circuit
Including N type switch tube SA, the N type switch tube SADrain electrode be connected respectively with the anode of battery pack and one end of capacitor C1；Institute
State N type switch tube SASource electrode respectively with inductance LP1One end and N type switch tube SBDrain electrode be connected；The N type switch tube SB
Source electrode be connected respectively with one end of the cathode of battery pack and capacitor C2；The other end of the capacitor C1 respectively with a side line
Enclose TPOne end be connected with the other end of capacitor C2；The first siding ring TPThe other end and inductance LP1The other end be connected
It connects；
Every two adjacent lithium battery forms a battery pack and a corresponding secondary side half-bridge circuit, m-th of secondary side half-bridge
Circuit includes N type switch tube S2m-1, the N type switch tube S2m-1Drain electrode be connected with the anode of corresponding battery pack；Institute
State N type switch tube S2m-1Source electrode be separately connected N type switch tube S2mDrain electrode and inductance LsmOne end；The inductance LsmIt is another
One end and second siding ring TsmOne end be connected；The second siding ring TsmThe other end be connected to corresponding two
The positive and negative anodes series line of lithium battery；The N type switch tube S2mSource electrode be connected with the cathode of corresponding battery pack.
2. serial lithium battery equalizer circuit according to claim 1, which is characterized in that the first siding ring TPWith inductance
LP1The one end being connected is Same Name of Ends；The second siding ring TsmWith inductance LsmThe one end being connected is Same Name of Ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910809193.8A CN110380493A (en) | 2019-08-29 | 2019-08-29 | A kind of serial lithium battery equalizer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910809193.8A CN110380493A (en) | 2019-08-29 | 2019-08-29 | A kind of serial lithium battery equalizer circuit |
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| CN110380493A true CN110380493A (en) | 2019-10-25 |
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| CN201910809193.8A Pending CN110380493A (en) | 2019-08-29 | 2019-08-29 | A kind of serial lithium battery equalizer circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113098115A (en) * | 2021-06-10 | 2021-07-09 | 西南交通大学 | Resonant series battery voltage-sharing circuit based on multi-port transformer and implementation method |
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