CN205081508U - A balanced device of charge -discharge for group battery - Google Patents
A balanced device of charge -discharge for group battery Download PDFInfo
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- CN205081508U CN205081508U CN201520820271.1U CN201520820271U CN205081508U CN 205081508 U CN205081508 U CN 205081508U CN 201520820271 U CN201520820271 U CN 201520820271U CN 205081508 U CN205081508 U CN 205081508U
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- bus bar
- battery
- relay
- equalizing
- equalizing bus
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Abstract
The utility model provides a balanced device of charge -discharge for group battery. The utility model discloses a balanced device of charge -discharge includes: balanced power module, balanced bus, equalizing resistance, relay group, protection circuit. To need balanced battery to insert balanced bus through the node relay group. Through balanced bus, for the battery monomer charges when discharging, discharge for the battery monomer when charging to reach the electric quantity equilibrium. The utility model discloses a group battery balancing equipment only need to adopt an equalizing resistance, and the balancing equipment among the prior art all need be equipped with corresponding equalizing resistance for every economize on electricity pond when charging to the group battery. Therefore, the utility model discloses a space has been practiced thrift to the device, can select less resistance to come faster equilibrium, and the sampling chip is kept away from to the resistance that generates heat moreover, does not influence the sampling. Furthermore, the utility model discloses a group battery balancing equipment can increase the electric quantity that whole group battery was emitted, can realize the more high -efficient utilization to the group battery.
Description
Technical field
The utility model relates to field of electrical control, is specifically related to a kind of device for carrying out charge and discharge balancing to the battery pack of electric motor car.
Background technology
Along with improving constantly of people's environmental consciousness, electric motor car is more and more subject to the favor of people.The Main Bottleneck of electric motor car development is battery, and lithium battery is then the main development direction of present stage electric motor car.
Because lithium battery in use exists with the form of battery pack often, different lithium battery can produce the difference in performance, and then the arrival maximum voltage value causing the battery cell of poor-performing more Zao than other battery cells when charging, simultaneously more Zao than other battery cells when discharging arrival minimum voltage value.It is that the mode of too high cell electric discharge is to guarantee that other battery cells can be filled with more electric charge that existing battery management system (BMS) adopts when charging more, this mode is discharged often through the resistance at battery node place or MOSFET, the collection of voltage data can be affected, and cannot play a role when discharging.
Figure 1 shows that a kind of mode battery pack balancing mode conventional at present, it, by the coupling resistance of multi-channel sampling chip, utilizes the switching function that acquisition chip is built-in, and when charging, the battery cell the highest to voltage discharges, to reach balanced object.
But this battery pack balancing mode has such shortcoming: 1, power loss is excessive, heat generating spot distance acquisition chip is comparatively near, can affect voltage sample; 2, cannot work during electric discharge; 3, more consuming time, cannot play a role than time very fast at charging rate.
It is undertaken by multichannel coupling coil that another kind realizes battery balanced scheme, by coil by the energy trasfer of ceiling voltage monomer to minimum voltage monomer.But this scheme has following shortcoming: 1, rate of energy transfer is too low; 2, the speed of energy trasfer is too slow.
Therefore, the existing problem that all there is himself for carrying out balanced mode to battery pack, cannot realize the most efficiency utilization to battery pack.
Utility model content
For the problems referred to above, the utility model can make all batteries discharge electricity as far as possible when discharging desirable to provide one, realizes battery equalizing equipment and the correlation method of battery pack optimal charge situation when charging.
Specifically, the utility model provides a kind of charging and discharging balance device for battery pack, it is characterized in that, described charging and discharging balance device comprises: balanced power module, equalizing bus bar, equalizing resistance, relay group, protective circuit, described battery pack is series battery, and total positive and negative electrode of described series battery is connected respectively to two inputs of described balanced power module;
Described equalizing bus bar comprises the first equalizing bus bar and the second equalizing bus bar;
Described relay group comprises node relay and odd even relay, in described battery pack, the two ends of every batteries connect a node relay, a node relay is shared between two batteries of arbitrary neighborhood, the node relay of odd number is connected to the first equalizing bus bar, and the node relay of even number is connected to the second equalizing bus bar;
The positive and negative output of described balanced power module connects two stiff ends of described odd even relay respectively, two movable ends of described odd even relay can order be connected with described first equalizing bus bar, described second equalizing bus bar, or order is connected with described second equalizing bus bar, the first equalizing bus bar;
Also be connected with described equalizing resistance between described first equalizing bus bar and described second equalizing bus bar, between described equalizing resistance and the described first or second equalizing bus bar, be provided with equalization discharge switch;
Charge balancing switch is provided with between described balanced power supply and total both positive and negative polarity of described battery pack;
Described protective circuit connects two stiff ends of described odd even relay respectively, and based on two stiff ends of described odd even relay voltage control described in the opening and closing of charge balancing switch.
In the preferred implementation of another kind, described protective circuit is used for providing feedback, to judge whether correctly accessed equalizing bus bar by balancing battery for described equalizing bus bar.
In the preferred implementation of another kind, described protective circuit comprises: the first operational amplifier and the second operational amplifier.
In the preferred implementation of another kind, the output of described protective circuit and predetermined threshold compare by described charging and discharging balance device, to judge describedly whether correctly accessed equalizing bus bar by balancing battery.
In the preferred implementation of another kind, described charging and discharging balance device comprises most difference battery identification module, and described most difference battery identification module judges the most difference battery in described battery pack based on the voltage in every batteries or transformation change.
Beneficial effect
Battery equalizing equipment of the present utility model and correlation method, when charging to battery pack, only need employing equalizing resistance, and balancing equipment of the prior art all need for every batteries is equipped with corresponding equalizing resistance.Therefore, by contrast, equipment of the present utility model has saved space, less resistance can be selected balanced faster, and heating resistor is away from sampling A/D chip, does not affect sampling.
Battery equalizing equipment of the present utility model is when discharging to battery pack, and carrying out the time that when equalization discharge makes electric discharge, minimum capacity monomer can discharge lengthens, and increases the electricity that whole battery pack is released.
In addition, the utility model, when carrying out charge and discharge balancing, adds balanced safety protective circuit, makes whole control procedure more reliable, and can not cause damage to balanced power supply.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of equalizing circuit used in the prior art;
The structural representation of the balancing equipment that Fig. 2 adopts for the utility model;
The principle schematic of the circuit of the balancing equipment that Fig. 3 adopts for the utility model;
The circuit diagram of protective circuit of Fig. 4 for adopting in the utility model embodiment.
Embodiment
The structural representation of the utility model balancing equipment as shown in Figure 2.As shown in the figure, the balancing equipment for battery pack of the present utility model comprises balanced relay group, equalizing bus bar, balanced power module, equalizing resistance, protective circuit.
In the present embodiment, battery pack comprises battery 1,2,3,4, the every batteries comprised in battery pack is one another in series, and the total both positive and negative polarity after battery pack series connection is connected to balanced power module (in order to make simple in circuits in figure, not drawing this part connection line).It will be appreciated by those skilled in the art that the number of battery in battery pack can increase and decrease arbitrarily, the utility model is understood for the ease of technical staff, only depicts four batteries.
Balanced relay group comprises node relay 7,8,9,10 and odd even relay 13, two stiff ends of odd even relay are connected to positive pole and the negative pole of balanced power supply respectively, the movable end of odd even relay can overlap with two terminals of terminal A side, also can overlap with two terminals of terminal B side.When the movable end of odd even relay and two terminals of terminal A side overlap, the first equalizing bus bar 11 is connected to the negative pole of balanced power supply, and the second equalizing bus bar 12 is connected to the positive pole of balanced power supply; Otherwise when the movable end of odd even relay and two terminals of terminal B side overlap, the first equalizing bus bar 11 is connected to the positive pole of balanced power supply, and the second equalizing bus bar 12 is connected to the negative pole of balanced power supply.
Here mentioned balanced power supply is mainly used in the both positive and negative polarity being connected to battery pack, and carries out the process such as voltage stabilizing, control to the output of battery pack.Balanced power supply is connected by charge balancing switch 6 with between battery anode, and the FEEDBACK CONTROL of charge balancing switch protected circuit.
Discharge resistance and discharge control switch 5 is also connected with between first equalizing bus bar 11 and the second equalizing bus bar 12, for when to batteries charging, the poorest battery cell (or can be described as the battery cell that charging voltage rises rapidly) is discharged.
In battery 1,2,3,4 arbitrary neighborhood two batteries between connect a node relay (battery also can have node relay with rearmost end foremost), the node relay of odd number is connected to first equalizing bus bar, and the node relay of even number is connected to second equalizing bus bar.Respective battery can be accessed odd even relay two ends after adjacent node relay adhesive.The controller of battery equalization device can drive odd even relay according to the node relay numbering of current adhesive, to select adhesive direction, guarantees that the both positive and negative polarity on equalizing bus bar can not mate with the both positive and negative polarity of balanced power supply.
The balancing equipment of the present embodiment can carry out Balance route to most difference battery monomer.Such as, if detect that battery 2 is the poorest cells that the utility model is thought, then the balanced flow process adopted when discharge and recharge is as follows:
(1) during charging:
1, relay 6 disconnects, and balanced power supply does not work, and odd even relay is to any direction adhesive.
2, by battery cell the highest for voltage, (being battery 2 in the present embodiment), node relay 7 and 8 adhesive at two ends.
3, relay 5 adhesive, the battery cell 2 the highest to voltage by discharge resistance discharges.
(2) during electric discharge:
1, relay 5 disconnects, and discharge resistance does not work.
2, by the node relay adhesive at battery cell two ends minimum for voltage, such as, present battery 2 voltage is minimum, then attracting electric relay 7,8.
3, by judging that the current odd even preparing balanced battery numbering determines the adhesive direction of odd even relay, such as, if current equalization battery 2, attracting electric relay 7,8, the bus be connected with relay 7 for just, another bus is negative, then odd even relay is to the adhesive of A direction; If current equalization battery 3, attracting electric relay 8,9, then the bus be connected with relay 8 for just, another is negative, odd even relay is to the adhesive of B direction.
4, relay 6 adhesive, battery pack always exports is charged to the battery cell that voltage is minimum by balanced power supply.
In addition, by one group of discharge circuit, the utility model determines that whether the voltage accessing equalizing bus bar is correct.This scheme can improve the reliability of bus balanced way, avoids the both positive and negative polarity of mistake to access balanced power supply.
Be illustrated in figure 4 the protective circuit that the utility model adopts.KA, KB are the input of this circuit, are connected to the output (in figure left side) of balanced power supply respectively.KA, KB meet inductance L 301 and L302 respectively, one end of inductance L 301 shunt-wound capacitance C311 and C312, and one end of contact resistance R317, the other end contact resistance R318 and electric capacity C313 respectively of R317, the other end of resistance R318 is connected to negative input end, the resistance R324 and electric capacity C316 of the first operational amplifier U301A (LM2904DR), resistance R324 and electric capacity C316 is connected in parallel to each other, and tie point in parallel is connected to the output of the first operational amplifier U301A.
The other end of inductance L 302 shunt-wound capacitance C311 and C312, and one end of contact resistance R319, the other end of R316 is connected to the positive input terminal of the first operational amplifier U301A and is connected to one end of resistance R325 and electric capacity C319, resistance R325 and electric capacity C319 is connected in parallel to each other, and other end ground connection.First operational amplifier is by the power voltage supply of positive and negative 5V.
The output of the first operational amplifier is connected to one end of resistance R333, the other end of resistance R333 is connected to the positive input terminal of the second operational amplifier U301B (model is LM2904DR), and be connected to+2.5V voltage via resistance R334, and via resistance R337 ground connection.The negative input end of the second operational amplifier U301B via resistance R332 ground connection, and is connected to one end of resistance R338, and the other end of resistance R338 is connected to the output of the second operational amplifier U301B.
The output of the second operational amplifier U301B is connected to again one end of resistance R339, and the other end of resistance R339 is connected to electric capacity C328, backward diode D321 (adopting MMSZ5227), and as the output of protective circuit.
This circuit is difference+summation operation circuit in the same way, because the voltage in KA, KB bus is positive and negative mutual voltage, so first adopt calculus of differences circuit counting to go out the relative voltage Va that two buses input, Va=(R324/ (R317+R318)) * (VkA-VkB), this voltage Va and reference voltage are sued for peace and are finally obtained desirable value Vb, Vb=(Rp/Rn) * R338* ((Va/R333)+(V2.5/R334)), wherein Rp=R333//R334//R337, Rn=R332//R338.Because the voltage range in KA, KB bus is given value, when equilibrium is closed, this circuit collection value Vb is a fixed value (value namely after voltage reference computing), therefore can according to the change of Vb value, by Vb value and a threshold value compare just can the connection of decision node relay whether correct, whether can open equilibrium, avoid balanced relay misoperation to cause battery short circuit.This protective circuit plays ring closure in equalizing circuit.
Balancing equipment of the present utility model can be incorporated in battery management system, carries out Row control by the MCU in battery management system.
Equipment of the present utility model will need balanced battery access equalizing bus bar by node relay group in use.By equalizing bus bar, be the charging of most difference battery monomer when discharging, is that most difference battery monomer discharges, to reach electric quantity balancing when charging.
By contrast, prior art adopts mostly discharges to cell when charging, and thinks that battery pack is filled with more electricity, but this mode can not solve the impact discharged total capacity when a battery capacity in battery pack produces deviation.Because the utility model can be battery cell charging when discharging, the short-board effect of battery pack can be overcome.Because the utility model adopts bus system balanced, only needing a discharge resistance when charging to during the poorest monomer electric discharge, the volume of discharge resistance and power consumption can be increased, to accelerate balancing speed.Therefore, equipment of the present utility model can improve the service efficiency of battery better.
Although be described in detail principle of the present utility model in conjunction with preferred embodiment of the present utility model above, those skilled in the art should understand that, above-described embodiment is only the explanation to exemplary implementation of the present utility model, not the utility model is comprised to the restriction of scope.Details in embodiment does not form the restriction to the utility model scope; when not deviating from spirit and scope of the present utility model; the apparent changes such as any equivalent transformation based on technical solutions of the utility model, simple replacement, all drop within the utility model protection range.
Claims (4)
1. for a charging and discharging balance device for battery pack, it is characterized in that, described charging and discharging balance device comprises: balanced power module, equalizing bus bar, equalizing resistance, relay group, protective circuit,
Described battery pack is series battery, and total positive and negative electrode of described series battery is connected respectively to two inputs of described balanced power module;
Described equalizing bus bar comprises the first equalizing bus bar and the second equalizing bus bar;
Described relay group comprises node relay and odd even relay, in described battery pack, the two ends of every batteries connect a node relay, a node relay is shared between two batteries of arbitrary neighborhood, the node relay of odd number is connected to the first equalizing bus bar, and the node relay of even number is connected to the second equalizing bus bar;
The positive and negative output of described balanced power module connects two stiff ends of described odd even relay respectively, two movable ends of described odd even relay can order be connected with described first equalizing bus bar, described second equalizing bus bar, or order is connected with described second equalizing bus bar, the first equalizing bus bar;
Also be connected with described equalizing resistance between described first equalizing bus bar and described second equalizing bus bar, between described equalizing resistance and the described first or second equalizing bus bar, be provided with equalization discharge switch;
Charge balancing switch is provided with between described balanced power supply and total both positive and negative polarity of described battery pack;
Described protective circuit connects two stiff ends of described odd even relay respectively, and based on two stiff ends of described odd even relay voltage control described in the opening and closing of charge balancing switch.
2. charging and discharging balance device according to claim 1, is characterized in that, described protective circuit is used for providing feedback, to judge whether correctly accessed equalizing bus bar by balancing battery for described equalizing bus bar.
3. charging and discharging balance device according to claim 1, is characterized in that, described protective circuit comprises: the first operational amplifier and the second operational amplifier.
4. charging and discharging balance device according to claim 1, it is characterized in that, described charging and discharging balance device comprises most difference battery identification module, and described most difference battery identification module judges the most difference battery in described battery pack based on the voltage in every batteries or transformation change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520820271.1U CN205081508U (en) | 2015-10-21 | 2015-10-21 | A balanced device of charge -discharge for group battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520820271.1U CN205081508U (en) | 2015-10-21 | 2015-10-21 | A balanced device of charge -discharge for group battery |
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| CN205081508U true CN205081508U (en) | 2016-03-09 |
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| CN201520820271.1U Active CN205081508U (en) | 2015-10-21 | 2015-10-21 | A balanced device of charge -discharge for group battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244957A (en) * | 2015-10-21 | 2016-01-13 | 北京小飞快充网络科技有限公司 | Charging and discharging equalization device for fast charging battery pack and corresponding equalization method |
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2015
- 2015-10-21 CN CN201520820271.1U patent/CN205081508U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244957A (en) * | 2015-10-21 | 2016-01-13 | 北京小飞快充网络科技有限公司 | Charging and discharging equalization device for fast charging battery pack and corresponding equalization method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200720 Address after: No.37, Fufa Road, Jingjin science and Technology Valley Industrial Park, Wuqing District, Tianjin Patentee after: Tianjin character Electric Technology Co., Ltd Address before: 100094 Beijing Haidian District City Yuan Zhi Village No. 2 flying Lixin building A block 3 layer 3068 Patentee before: BEIJING XIAOFEIKUAICHONG NETWORK TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |