CN207398867U - A kind of battery pack balancing device - Google Patents
A kind of battery pack balancing device Download PDFInfo
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- CN207398867U CN207398867U CN201721234080.2U CN201721234080U CN207398867U CN 207398867 U CN207398867 U CN 207398867U CN 201721234080 U CN201721234080 U CN 201721234080U CN 207398867 U CN207398867 U CN 207398867U
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- battery pack
- discharge
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Abstract
The utility model is related to a kind of battery pack balancing device, including micro- converter unit, it is each be slightly variable change it is unit cascaded in groups, by setting bypass channel and charging and discharging passage to each micro- converter unit, realize that the power during battery set charge/discharge is lossless, save electric energy.Charging and discharging passage is in series by the battery port and at least two that are used to connect corresponding battery unit charge and discharge controllable switch in parallel, bypass channel is made of at least two bypass controllable switches in parallel, so as to reduce internal resistance, heating loss and heat dissipation pressure are reduced.The device is simple and reliable, during charging and discharging, makes each battery capacity of series connection tend to be balanced, is resistant to the situation of power energy-storage battery high current charge-discharge, plays the capacity of battery to greatest extent, extend the service life of battery pack.
Description
Technical field
The utility model belongs to energy-storage battery balancing technique field, and in particular to a kind of battery pack balancing device.
Background technology
With the popularization of new energy and the fast development of electric car and the application of energy-accumulating power station technology, capacity cell fills
Power technology becomes everybody concern the most.
Lithium ion single cell voltage is low, and to obtain high voltage just needs more piece single battery to connect, and single battery exists
Property difference is very big during the manufacturing and use.Through use after a while, battery status necessarily causes imbalance, into
And cause the parameters such as capacity, internal resistance, the terminal voltage of battery unequal, and the service life of battery pack follows Bucket Principle, i.e.,
The capacity of that minimum section single battery is equal to the capacity of whole group battery pack；The actual capacity for ultimately resulting in entire battery pack becomes
It is small, short life and cost increase.Battery charging and discharging controls the improper voltage that can cause battery and electricity inconsistency, and then causes
The short life of battery lacks security.
The Chinese patent application file of Application No. 201510355371.6 discloses a kind of balanced electricity of battery set charge/discharge
Road and charging/discharging thereof, the circuit include becoming piezoelectricity, N number of converting unit and corresponding N number of control module, N number of converting unit according to
Secondary cascade is used cooperatively, control module using bypass circuit with the sequence charge/discharge control method of the monomer battery voltage based on SOC
The active voltage balancing that real-time online is carried out by the difference of voltage or SOC controls, battery set charge/discharge is avoided to overcharge in the process,
Cross put, charge less the problems such as.Converting unit in the circuit is electrically controllable by least one bypass controllable switch and at least one charge and discharge
Switch is formed, when for it is multiple when, internal resistance is larger, and heating loss and heat dissipation pressure are larger, can not processing power electric current well
The heat dispersal situations in circuit.
Utility model content
The purpose of this utility model is to provide a kind of battery pack balancing device, to solve battery pack of the prior art
The problem of consume of discharging equalizing circuit and big heat dissipation pressure.
In order to solve the above technical problems, the technical solution of the utility model is：
A kind of battery pack balancing device of the utility model, including control module and micro- translation circuit；
Micro- translation circuit is made of at least two micro- converter units, and each micro- converter unit corresponds to a battery list
Member, each micro- converter unit have for changing unit cascaded cascade port with adjacent be slightly variable, and each micro- converter unit passes through cascade
Port cascades；Charging and discharging passage and bypass channel are parallel on the cascade port of each micro- converter unit, the charge and discharge are led to
Road is used for to be opened during battery unit charge or discharge, and the bypass channel is used for when not being battery unit charge or discharge
Battery unit is bypassed；
The charging and discharging passage is by being used to connect the battery port of corresponding battery unit and the charge and discharges of at least two parallel connections
Electrically controllable switch is in series, and the bypass channel is made of at least two bypass controllable switches in parallel；
Control module control connects micro- converter unit.
Further, the control module includes a controller and at least two measurement and control units, each measurement and control unit
Control connects corresponding micro- converter unit.
Further, the controller is interconnected by CAN bus and each measurement and control unit.
Further, the charge and discharge controllable switch is metal-oxide-semiconductor.
Further, the bypass controllable switch is metal-oxide-semiconductor.
Further, micro- converter unit is arranged on pcb board.
Further, the pcb board is 4 layers of pcb board, and is provided with to cover copper part for increase heat dissipation on pcb board.
Further, the battery port both ends are parallel with Support Capacitor.
Further, it is in series with fuse in the battery port.
The beneficial effects of the utility model：
The battery pack balancing device of the utility model, including micro- converter unit, it is each be slightly variable change it is unit cascaded in groups, pass through
Bypass channel and charging and discharging passage are set to each micro- converter unit, realize that the power during battery set charge/discharge is lossless,
Save electric energy.Charging and discharging passage can by the battery port and at least two charge and discharge in parallel for being used to connect corresponding battery unit
Control switch is in series, and bypass channel is made of at least two bypass controllable switches in parallel, so as to reduce internal resistance, reduces
Heating loss and heat dissipation pressure.The device is simple and reliable, during charging and discharging, each battery capacity of series connection is made to become
In equilibrium, the situation of power energy-storage battery high current charge-discharge is resistant to, the capacity of battery is played to greatest extent, extends battery
The service life of group.
Further, the power amplifier board including controllable switch is designed as four layers of pcb board, internal layer outer layer large area covers copper, increases
Add heat-sinking capability, reduced internal resistance, accelerate radiating rate.
Description of the drawings
Fig. 1 is the battery pack balancing device circuit diagram of the utility model；
Fig. 2 is power amplifier board and heat spreader structures figure.
Specific embodiment
To make the purpose of this utility model, technical solution and advantage clearer, with reference to the accompanying drawings and embodiments, to this
Utility model is described in further detail.
In order to realize the equilibrium of battery pack in charge and discharge process, realized using battery pack balancing device as shown in Figure 1
The charge and discharge balancing of battery pack.
As shown in Figure 1, the device is used based on cascade micro- transformer configuration, N number of parallel operation that is slightly variable is cascaded up, it is N number of
It is slightly variable parallel operation and is equipped with 1 controller, the system can gather at least battery of three casees.
The device includes controller MMC11,3 measurement and control units and micro- converter unit corresponding with each measurement and control unit；
Each measurement and control unit control connects corresponding micro- converter unit.Micro- converter unit is responsible for during battery charging and discharging, over-pressed, deficient
The bypass of piezoelectric battery is acted with incision, does battery balanced specific action.The battery unit that controller MMC11 connects according to acquisition
Voltage, and judged, balancing actions instruction assigned to each micro- converter unit.Controller MMC11 changes list with each be slightly variable
Member is interconnected by CAN bus.
Each micro- converter unit has to change unit cascaded cascade port I+/I- with adjacent be slightly variable, and is respectively slightly variable and changes list
Member is cascaded by cascading port.Charging and discharging passage and bypass channel are parallel on the cascade port of each micro- converter unit；It fills
Discharge of electricity passage is used in the case where each battery case is charge or discharge state open；Bypass channel is used to not be that battery case charges
Or battery case is bypassed during electric discharge.Charging and discharging passage by be used to connect corresponding battery unit battery port B+/B- and two
Charge and discharge controllable switch M1, M2 in parallel is in series, and bypass channel is made of two bypass controllable switch M3, M4 in parallel.
Charge and discharge controllable switch M1, M2 and bypass controllable switch M3, M4 will not be simultaneously turned on, and the situation of aircraft bombing is avoided to occur.
The charging and discharging currents of energy-storage battery are larger, easily generate heat in the power device of circuit, in order to solve to control
The heat dissipation problem of power current part, charge and discharge electric channel, the controllable switch of bypass channel are with 2 low internal resistance high current metal-oxide-semiconductors
Parallel connection to reduce internal resistance, reduces heating loss and heat dissipation pressure, realizes high current, small space.Moreover, selection internal resistance and encapsulation
Suitable metal-oxide-semiconductor, internal resistance are resistant in 1.5 milliohms, TO-247 encapsulation, junction temperature between+170 DEG C.
This hardware unit is used in large power energy storage battery system, and electric current is resistance in order to enable the device to from 20A to 100A
By for a long time, within 100A electric current, it is necessary to the heat dissipation problem of processing power current loop well.In order to increase reliability, adopt
Use large-area heat radiator.It designs 4 layers of internal layer and outer layer and all spreads the power amplifier board of copper, as shown in Fig. 2, 4 metal-oxide-semiconductors are carried out
Independently installed, pin is all welded on power amplifier board, and is directly attached on bottom plate aluminum profile heat radiator, is reduced thermal resistance, is added
Fast radiating rate realizes the self-cold radiating of power device, is not accessed again on control panel directly while to be resistant to 100A electric currents
Bigbore conducting wire, instead of using the mode of thicker diameter wire between power amplifier board and control panel, to substantially reduce installation difficulty.Make
It obtains during actual high current charge-discharge, when guarantee works long hours, temperature rises control in than relatively low scope.
It is illustrated in figure 2 power amplifier board and heat spreader structures figure, the big rectangle of ragged edge is radiator, the small rectangle in the inside
For power amplifier board.M3, M4 points of charge and discharge controllable switch M1, M2 and bypass controllable switch are opened into patch on a heat sink and are screwed
It is good, it is separated between charge and discharge controllable switch M1, M2 and bypass controllable switch M3, M4 and radiator with insulation heat-proof silica gel pad, and
By screw tightening, so as to the metal back of the body of charge and discharge controllable switch M1, M2 and bypass controllable switch M3, M4 can held against heat sink, with
Just more effectively heat dissipation.
On the whole, the apparatus structure is simple, reliable, is resistant to the situation of power energy-storage battery high current charge-discharge.
Based on above device, following method can be used to realize battery pack balancing：
When battery pack is in charged state, the voltage that the controller of equalizing circuit actively gathers all battery cases is gone forward side by side
Row sequence, judges whether the highest battery case of voltage and the difference of the minimum battery case of voltage are more than the first voltage threshold set
Value, if more than the first voltage threshold value of setting, then the highest battery case of bypass voltage, charges to remaining battery case, is filling
After the first time of electricity setting, the battery case being bypassed is cut into charge circuit again and is charged, is continued to all batteries
Case charges.Then, controller can re-start acquisition to all battery cases and sort, and repeat the above process, until filling
Electricity is completed.
When battery pack is in discharge condition, the voltage that the controller of equalizing circuit actively gathers all battery cases is gone forward side by side
Row sequence, judges whether the highest battery case of voltage and the difference of the minimum battery case of voltage are more than the second voltage threshold set
Value, if more than the second voltage threshold value of setting, then the minimum battery case of bypass voltage, discharges to remaining battery case, is putting
After the first time of electricity setting, the battery case being bypassed is cut into discharge loop again and is discharged, is continued to all batteries
Case discharges.Then, controller can re-start acquisition to all battery cases and sort, and repeat the above process, until putting
Electricity is completed.
Although the content of the utility model is discussed in detail by above preferred embodiment, but it should be appreciated that on
The description stated is not considered as the limitation to the utility model.After those skilled in the art have read the above, for
A variety of modifications and substitutions of the utility model all will be apparent.Therefore, the scope of protection of the utility model should be by appended
Claim limit.
Claims (9)
1. a kind of battery pack balancing device, which is characterized in that including control module and micro- translation circuit；
Micro- translation circuit is made of at least two micro- converter units, and each micro- converter unit corresponds to a battery unit, often
A micro- converter unit has for changing unit cascaded cascade port with adjacent be slightly variable, and each micro- converter unit is by cascading port level
Connection；Charging and discharging passage and bypass channel are parallel on the cascade port of each micro- converter unit, the charge and discharge electric channel is used for
To be opened during battery unit charge or discharge, the bypass channel is used for battery when not being battery unit charge or discharge
Unit bypass；
The charging and discharging passage can by the battery port and at least two charge and discharge in parallel for being used to connect corresponding battery unit
Control switch is in series, and the bypass channel is made of at least two bypass controllable switches in parallel；
Control module control connects micro- converter unit.
2. battery pack balancing device according to claim 1, which is characterized in that the control module includes a controller
With at least two measurement and control units, each measurement and control unit control connects corresponding micro- converter unit.
3. battery pack balancing device according to claim 2, which is characterized in that the controller is by CAN bus and respectively
Measurement and control unit interconnects.
4. battery pack balancing device according to claim 1, which is characterized in that the charge and discharge controllable switch is metal-oxide-semiconductor.
5. battery pack balancing device according to claim 1, which is characterized in that the bypass controllable switch is metal-oxide-semiconductor.
6. battery pack balancing device according to claim 1, which is characterized in that micro- converter unit is arranged on pcb board
On.
7. battery pack balancing device according to claim 6, which is characterized in that the pcb board is 4 layers of pcb board, and PCB
It is provided with to cover copper part for increase heat dissipation on plate.
8. battery pack balancing device according to claim 1, which is characterized in that the battery port both ends are parallel with support
Capacitance.
9. battery pack balancing device according to claim 1, which is characterized in that insurance is in series in the battery port
Silk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721234080.2U CN207398867U (en) | 2017-09-25 | 2017-09-25 | A kind of battery pack balancing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721234080.2U CN207398867U (en) | 2017-09-25 | 2017-09-25 | A kind of battery pack balancing device |
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| Publication Number | Publication Date |
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| CN207398867U true CN207398867U (en) | 2018-05-22 |
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| CN201721234080.2U Active CN207398867U (en) | 2017-09-25 | 2017-09-25 | A kind of battery pack balancing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709362A (en) * | 2019-01-18 | 2019-05-03 | 南京优倍电气有限公司 | The circuit of artifical resistance is realized using DAC |
| CN116365650A (en) * | 2023-03-27 | 2023-06-30 | 深圳先阳新能源技术有限公司 | Battery bypass balance control system and method |
-
2017
- 2017-09-25 CN CN201721234080.2U patent/CN207398867U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709362A (en) * | 2019-01-18 | 2019-05-03 | 南京优倍电气有限公司 | The circuit of artifical resistance is realized using DAC |
| CN116365650A (en) * | 2023-03-27 | 2023-06-30 | 深圳先阳新能源技术有限公司 | Battery bypass balance control system and method |
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