CN209434344U - The capacity-enlarging system of ferric phosphate lithium cell packet - Google Patents
The capacity-enlarging system of ferric phosphate lithium cell packet Download PDFInfo
- Publication number
- CN209434344U CN209434344U CN201920396795.0U CN201920396795U CN209434344U CN 209434344 U CN209434344 U CN 209434344U CN 201920396795 U CN201920396795 U CN 201920396795U CN 209434344 U CN209434344 U CN 209434344U
- Authority
- CN
- China
- Prior art keywords
- lithium cell
- ferric phosphate
- phosphate lithium
- cell packet
- unit
- 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.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to energy technology fields, and in particular to the capacity-enlarging system of ferric phosphate lithium cell packet, wherein system includes at least one variable resistance unit, has first switch device and first resistor in parallel；Wherein, variable resistance unit is connected with the first ferric phosphate lithium cell packet；Current detecting unit is electrically connected with control unit, the electric current of the charge or discharge for detecting the first ferric phosphate lithium cell packet, and electric current is sent to control unit；Control unit is electrically connected with first switch device and current detecting unit；Control unit is used to be based on current trigger first switch break-over of device or shutdown, to adjust the resistance value of variable resistance unit.It is detected using electric current of the current detecting unit to the charge and discharge of the first ferric phosphate lithium cell packet, cooperate again with the movement of variable resistance unit, the internal resistance for adjusting variable resistance unit at any time, to solve the problems, such as that the first ferric phosphate lithium cell packet and the second ferric phosphate lithium cell packet (i.e. new and old ferric phosphate lithium cell packet) are used in parallel.
Description
Technical field
The utility model relates to energy technology fields, and in particular to the capacity-enlarging system of ferric phosphate lithium cell packet.
Background technique
The ferric phosphate lithium cell packet of large capacity be widely applied with electric bus, low-speed electronic automobile, electri forklift and
The industries such as solar energy storage.Wherein, since ferric phosphate lithium cell packet safety is preferable, service life cycle is long and cost is more next
Lower, social required quantity is increasing.But when product uses for a long time, i.e., the battery pack capacity attenuation configured when factory arrives
80% and it is following when, user can obviously feel that battery pack shortens cruise duration, and the practicability of product reduces.
At this point, being easy for it is conceivable that by new LiFePO4 in parallel on the basis of this Geju City ferric phosphate lithium cell packet
Battery pack carry out dilatation, then after dilatation the cruise duration of battery pack be greater than the stylish battery pack of product export, and old phosphorus
It is 60% or so that the residual value of sour lithium iron battery packet, which uses SOH, be preferable battery core echelon by the way of.
However, in parallel cannot use in the new used batteries of battery industry is a well-known viewpoint.This is because when long
Between the battery core of ferric phosphate lithium cell packet after use be mainly shown as that internal resistance becomes larger, and internal resistance is pushed the speed difference；That is, after not
Know the internal resistance of old ferric phosphate lithium cell packet has become larger how many.
Utility model content
In view of this, the utility model embodiment provides a kind of capacity-enlarging system of ferric phosphate lithium cell packet, it is new to solve
The problem in parallel of old ferric phosphate lithium cell packet.
According in a first aspect, the utility model embodiment provides a kind of capacity-enlarging system of ferric phosphate lithium cell packet, comprising:
At least one variable resistance unit has first switch device and first resistor in parallel；Wherein, the variable resistance unit
It connects with the first ferric phosphate lithium cell packet；The first ferric phosphate lithium cell packet is in parallel with the second ferric phosphate lithium cell packet, and the
The internal resistance of one ferric phosphate lithium cell packet is less than the internal resistance of the second ferric phosphate lithium cell packet；
Current detecting unit is electrically connected with control unit, for detect the first ferric phosphate lithium cell packet charging or
The electric current of electric discharge, and the electric current is sent to described control unit；
Described control unit is electrically connected with the first switch device and the current detecting unit；The control is single
Member is for being based on first switch break-over of device or shutdown described in the current trigger, to adjust the resistance value of the variable resistance unit.
The capacity-enlarging system of ferric phosphate lithium cell packet provided by the embodiment of the utility model, due to the second ferric phosphate lithium cell packet
It is in parallel with the first ferric phosphate lithium cell packet, that is, the output voltage of two ferric phosphate lithium cell packets is identical；And first LiFePO4 electricity
The internal resistance of Chi Bao less than the second ferric phosphate lithium cell packet internal resistance, then the second ferric phosphate lithium cell packet can undertake should hold than it
The electric current of load is small, and the first ferric phosphate lithium cell packet just needs to undertake bigger than the electric current that it should undertake, and this high current arrives greatly
It is sufficient to make the first ferric phosphate lithium cell packet that overcurrent protection occurs, therefore using current detecting unit to the first ferric phosphate lithium cell
The electric current of the charge and discharge of packet is detected, then is cooperated with the movement of variable resistance unit, adjusts the internal resistance of variable resistance unit at any time, avoids the
Overcurrent protection occurs for one ferric phosphate lithium cell packet, to solve the first ferric phosphate lithium cell packet and the second ferric phosphate lithium cell
Wrap (i.e. new and old ferric phosphate lithium cell packet) problem used in parallel.
With reference to first aspect, in first aspect first embodiment, the first switch device is field-effect tube, described
The grid of first switch device is connect with described control unit, it is in parallel between the source electrode and drain electrode of the first switch device described in
First resistor.
The capacity-enlarging system of ferric phosphate lithium cell packet provided by the embodiment of the utility model realizes variable resistance list using field-effect tube
The resistance value adjustment of member, has the advantages of simple structure and easy realization.
First embodiment with reference to first aspect, in first aspect second embodiment, further includes: with the variable resistance list
The concatenated second resistance of member.
With reference to first aspect, in first aspect third embodiment, further includes:
By-pass unit has concatenated second switch device and 3rd resistor；Wherein, the by-pass unit and described the
One ferric phosphate lithium cell packet is in parallel；
Temperature sensor is sent to institute for detecting the temperature of the first ferric phosphate lithium cell packet, and by the temperature
Control unit is stated, to trigger the on or off of the second switch device.
The capacity-enlarging system of ferric phosphate lithium cell packet provided by the embodiment of the utility model, after heavy-current discharge, electricity
The temperature of Chi Bao can increase；Using the temperature of temperature sensor real-time detection the first ferric phosphate lithium cell packet, then cooperate to bypass
The movement of second switch device in unit so that consuming in electric current when the temperature is excessively high from by-pass unit, and avoids the first phosphoric acid
Lithium iron battery packet mutually charges with the second ferric phosphate lithium cell packet, further ensures the first ferric phosphate lithium cell packet and the second phosphorus
The safety used in parallel of sour lithium iron battery packet.
Third embodiment with reference to first aspect, in the 4th embodiment of first aspect, described control unit is described
The battery management system of first ferric phosphate lithium cell packet.
The capacity-enlarging system of ferric phosphate lithium cell packet provided by the embodiment of the utility model utilizes the first ferric phosphate lithium cell packet
The battery management system of itself can reduce the volume of the capacity-enlarging system as control unit, to ensure that the capacity-enlarging system
With biggish power density.
4th embodiment with reference to first aspect, in the 5th embodiment of first aspect, the first LiFePO4 electricity
CAN communication is used between the battery management system of Chi Bao and the battery management system of the second ferric phosphate lithium cell packet.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram according to the capacity-enlarging system of the ferric phosphate lithium cell packet of the utility model embodiment；
Fig. 2 is the structural schematic diagram according to the capacity-enlarging system of the ferric phosphate lithium cell packet of the utility model embodiment；
Fig. 3 is the structural schematic diagram according to the capacity-enlarging system of the ferric phosphate lithium cell packet of the utility model embodiment；
Fig. 4 is the structural schematic diagram according to the capacity-enlarging system of the ferric phosphate lithium cell packet of the utility model embodiment；
Fig. 5 is the flow chart according to the expansion method of the ferric phosphate lithium cell packet of the utility model embodiment；
Fig. 6 is the flow chart according to the expansion method of the ferric phosphate lithium cell packet of the utility model embodiment；
Fig. 7 is the flow chart according to the expansion method of the ferric phosphate lithium cell packet of the utility model embodiment；
Fig. 8 is the flow chart according to the expansion method of the ferric phosphate lithium cell packet of the utility model embodiment；
Appended drawing reference:
10- variable resistance unit；Q1a, Q1b- first switch device；R1a, R1b- first resistor；R2- second resistance；
20- current detecting unit；
30- by-pass unit；Q2- second switch device；R3- 3rd resistor；
40- the first ferric phosphate lithium cell packet；50- the second ferric phosphate lithium cell packet；60a- control unit；60b- battery management
System.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, those skilled in the art's every other embodiment obtained without making creative work, belongs to this reality
With novel protected range.
For battery industry, new and old battery pack can not be used in parallel, mainly the internal resistance due to new and old battery pack
It is different.Specifically, with the use of time, the internal resistance of used batteries packet is increasing, and specifically increase how much, with which kind of rule
Increase, those skilled in the art are simultaneously unaware of.Based on this, the utility model provides a kind of dilatation system of ferric phosphate lithium cell packet
System, to realize the parallel connection of new and old battery pack, i.e., new and old battery pack is used with.
The first ferric phosphate lithium cell packet can be referred to as new ferric phosphate lithium cell packet again in the description of the present invention,
Second ferric phosphate lithium cell packet can be referred to as old ferric phosphate lithium cell packet again.The application scenarios of the capacity-enlarging system are the second phosphorus
Sour lithium iron battery packet use one section when after, due to its battery capacity reduce, it is difficult to meet using second LiFePO4 electricity
Therefore the demand of the product of Chi Bao on the basis of the second ferric phosphate lithium cell packet, passes through the first ferric phosphate lithium cell in parallel
Packet, to expand the battery capacity of battery pack entirety；It is i.e. that the first ferric phosphate lithium cell packet is in parallel with the second ferric phosphate lithium cell packet,
To realize that the echelon of the second ferric phosphate lithium cell packet utilizes.
Utility model people has found in the research process to new and old ferric phosphate lithium cell packet parallel connection, new and old ferric phosphate lithium cell
Wrap it is used in parallel, then the output voltage of new and old ferric phosphate lithium cell packet is identical, due to the internal resistance of new and old ferric phosphate lithium cell packet
Difference, then the charging and discharging currents of new and old ferric phosphate lithium cell packet are different.Therefore, ferric phosphate lithium cell packet provided by the utility model
Capacity-enlarging system from the charging and discharging currents angle of ferric phosphate lithium cell packet, by new ferric phosphate lithium cell packet charging and discharging currents
Real-time detection realizes the mixed of new and old ferric phosphate lithium cell packet.
The capacity-enlarging system of ferric phosphate lithium cell packet provided by the embodiment of the utility model, as shown in Figure 1, comprising: variable resistance list
Member 10, current detecting unit 20 and control unit 60a.
The capacity-enlarging system is to guarantee on the basis of original second ferric phosphate lithium cell packet 50 in the first ferric phosphate lithium cell
Packet 40 can be used in parallel with the second ferric phosphate lithium cell packet 50.The internal resistance of first ferric phosphate lithium cell packet 40 is less than the second phosphoric acid
The internal resistance of lithium iron battery packet 50, the i.e. second ferric phosphate lithium cell packet 50 are the old ferric phosphate lithium cell using a period of time
Packet, the first ferric phosphate lithium cell packet 40 are new ferric phosphate lithium cell packet.
Wherein, current detecting unit 20 is used to detect the charging and discharging currents of the first ferric phosphate lithium cell packet 40, can be
Current sensor, is also possible to other current detecting parts, does not do any restriction to its specific structure at this, need to only guarantee its energy
Enough detect the charging and discharging currents of the first ferric phosphate lithium cell packet 40.
Control unit 60a is electrically connected with current detecting unit 20 and all variable resistance units 20, which is used for
In charging and discharging currents triggering variable resistance unit 20 based on the first ferric phosphate lithium cell packet 40 detected by current detecting unit 20
First switch device on or off.Wherein, since ferric phosphate lithium cell packet during installation can be simultaneously equipped with cell tube
Reason system, then control unit 60a can be the corresponding battery management system of ferric phosphate lithium cell packet；Control unit 60a
It can be the circuit realized using hardware circuit and there is comparing function, realize charging and discharging currents and default electricity for example, by using comparator
Then the size of stream triggers the movement etc. of first switch device again, is not intended to limit the specific structure of control unit 60a herein.
Referring to Figure 1, two groups of concatenated variable resistance units 10 are shown in FIG. 1, every group of variable resistance unit 10 includes in parallel
First switch device Q1a and first resistor R1a.Specifically, first switch device Q1a can be MOSFET, first switch device
Part Q1a and current detecting unit 20 are electrically connected with control unit 60a, the first ferric phosphate that current detecting unit 20 will test
The charging and discharging currents of lithium battery pack 40 are sent to control unit 60a, control unit 60a charging and discharging currents based on the received
The on or off of size triggering first switch device Q1a.Wherein, charging and discharging currents are bigger, it is necessary to all variable resistance units 10
Resistance value it is bigger；Charging and discharging currents are smaller, it is necessary to which the resistance value of all variable resistance units 10 is smaller.
Optionally, first switch device is field-effect tube, can be N-type MOSFET, wherein the grid of first switch device
It is connect with control unit 60a, first resistor in parallel between source electrode and drain electrode.The capacity-enlarging system realizes variable resistance list using field-effect tube
The resistance value adjustment of member 10, has the advantages of simple structure and easy realization.
The variable resistance principle of two groups of variable resistance units 10 is as follows in Fig. 1: when Q1a and Q1b are both turned on, first resistor R1a and R1b
It is short-circuited, that is, the resistance value of two groups of variable resistance units 10 is approximately 0；When Q1a conducting, Q1b cut-off, first resistor R1a is short-circuited,
That is, the resistance value of two groups of variable resistance units 10 is the resistance value of R1b；When Q1b conducting, Q1a cut-off, first resistor R1b is short-circuited, that is,
The resistance value of two groups of variable resistance units 10 is the resistance value of R1a；When Q1a and Q1b are turned off, the resistance value of two groups of variable resistance units 10 is R1a
The sum of with the resistance value of R1b.
It should be noted that variable resistance unit 10 is not limited to shown in Fig. 1 two groups, it can be 3 groups, 4 groups etc., specifically
The quantity of variable resistance unit 10 can be configured as the case may be.Wherein, the first switch device in variable resistance unit 10 is same
The MOSFET being also not necessarily limited in Fig. 1, or other kinds of switching device.
Further, be not limited to connect between variable resistance unit 10, can also in parallel or mixed connection, specific connection type take
Certainly in the resistance value of the first resistor in parallel with first switch device.Therefore, no matter being connected in which way between variable resistance unit 10,
Though first switch device why seed type, only need to guarantee the variable resistance unit 10 can under the control of control unit 60a in real time
Adjust the resistance value of resistance.
The capacity-enlarging system of ferric phosphate lithium cell packet provided in this embodiment, due to the second ferric phosphate lithium cell packet 50 and first
Ferric phosphate lithium cell packet 40 is in parallel, that is, the output voltage of two ferric phosphate lithium cell packets is identical；And the first ferric phosphate lithium cell packet
40 internal resistance less than the second ferric phosphate lithium cell packet 50 internal resistance, then can undertake should than it for the second ferric phosphate lithium cell packet 50
The electric current undertaken is small, and the first ferric phosphate lithium cell packet 40 is bigger than the electric current that it should undertake with regard to needing to undertake, and this high current
It is large enough so that overcurrent protection occurs for the first ferric phosphate lithium cell packet 40, therefore using current detecting unit 20 to the first phosphoric acid
The electric current of the charge and discharge of lithium iron battery packet 40 is detected, then is cooperated with the movement of variable resistance unit 10, adjusts variable resistance unit at any time
10 internal resistance avoids the first ferric phosphate lithium cell packet 40 that overcurrent protection occurs, to solve the first ferric phosphate lithium cell packet
40 and second ferric phosphate lithium cell packet 50 (the i.e. new and old ferric phosphate lithium cell packet) problem used in parallel.
In some optional embodiments of the present embodiment, as shown in Fig. 2, the capacity-enlarging system further includes having second resistance
R2, second resistance R2 connect with variable resistance unit 10.When first switch device is both turned in variable resistance unit 10, all variable resistance lists
The resistance of member 10 is 0, then can use second resistance R2 realizes the first ferric phosphate lithium cell packet 40 and the second LiFePO4 electricity
The current balance of pond packet 50.
The utility model implementation additionally provides a kind of capacity-enlarging system of ferric phosphate lithium cell packet, as shown in figure 3, including variable resistance
Unit 10, current detecting unit 20, by-pass unit 30, temperature sensor and control unit 60a.Wherein, about variable resistance unit
10, the specific structural details of current detecting unit 20 and control unit 60a, embodiment is detailed referring to fig. 1 to fig. 2
Description, details are not described herein.
Wherein, by-pass unit 30 is in parallel with the first ferric phosphate lithium cell packet 40, with concatenated second switch device Q2
And 3rd resistor R3.Wherein, second switch device Q2 is connect with control unit 60a, and described control unit 60a is for triggering the
The on or off of two switching device Q2.When second switch device Q2 conducting, 3rd resistor R3 and the first ferric phosphate lithium cell
Packet 40 is in parallel, forms bypass；When second switch device Q2 shutdown, by-pass unit 30 is equivalent to be disconnected from the capacity-enlarging system.
Meanwhile the conducting of second switch device Q2, or shutdown depend on collected first ferric phosphate of temperature sensor institute
The temperature of lithium battery pack 40.Specifically, the temperature for the first ferric phosphate lithium cell packet 40 that temperature sensor will test is sent to
Control unit 60a, control unit 60a determine whether to trigger the conducting of second switch device based on the size of measured temperature value
Or shutdown.
The working principle of by-pass unit 30 is as follows: when the first ferric phosphate that control unit 60a is detected based on temperature sensor
The temperature triggered second switch device Q1 of lithium battery pack 40 is connected, and 3rd resistor and the first ferric phosphate lithium cell packet 40 be simultaneously at this time
Connection, after the first ferric phosphate lithium cell packet 40 and the second ferric phosphate lithium cell packet 50 heavy-current discharge terminate, the first phosphoric acid
Lithium iron battery packet 40, the second ferric phosphate lithium cell packet 50 and by-pass unit 30 form closed circuit, two ferric phosphate lithium cells
Electric current caused by wrapping is back to ferric phosphate lithium cell packet by by-pass unit 30, is can be avoided at this time when temperature is higher, two
The mutual charging of a ferric phosphate lithium cell packet.
The capacity-enlarging system of ferric phosphate lithium cell packet provided in this embodiment utilizes the temperature of the first ferric phosphate lithium cell packet 40
The access state of adjustment by-pass unit 30 in real time, prevents the first ferric phosphate lithium cell packet 40 and the second LiFePO4 when the temperature is excessively high
The mutual charging of battery pack 50, to improve the first ferric phosphate lithium cell packet 40 and the second ferric phosphate lithium cell packet 50 (i.e. newly
Old ferric phosphate lithium cell packet) it is used in parallel when safety.
As a kind of optional embodiment of the present embodiment, second switch device Q2 can be identical as first switch device,
It can also be different from first switch device.Any restrictions are not done to the specific structure of second switch device Q2 at this, only need to protect
The state of its on or off can be adjusted under the triggering of control unit 60a by demonstrate,proving it.In Fig. 3, first switch device and
Two switching device Q2 are identical, are N-type MOSFET.
In some optional embodiments of the present embodiment, as shown in figure 4, control unit 60a is corresponding to the first lithium electricity
The battery management system 60b in pond 40.Since each ferric phosphate lithium cell packet can generally be corresponded to equipped with cell tube when in use
Reason system can reduce the volume of the capacity-enlarging system using the battery management system as the control unit of capacity-enlarging system, thus
It ensure that the capacity-enlarging system has biggish power density.
Still optionally further, the first ferric phosphate lithium cell packet 40 and the corresponding battery of the second ferric phosphate lithium cell packet 50
CAN communication is used between management system, mainly notifies the corresponding battery management system of the second ferric phosphate lithium cell packet 50, first
Ferric phosphate lithium cell packet 40 has shared the warning message of how many current information and the first ferric phosphate lithium cell packet 40.
The utility model embodiment additionally provides a kind of expansion method of ferric phosphate lithium cell packet, is used in control unit,
As shown in figure 5, this method comprises:
S11 obtains the electric current of the charge or discharge of the first ferric phosphate lithium cell packet.
Wherein, the first ferric phosphate lithium cell packet is in parallel with the second ferric phosphate lithium cell packet, and the first LiFePO4 electricity
Internal resistance of the internal resistance of Chi Bao less than the second ferric phosphate lithium cell packet.
Specifically, the first ferric phosphate lithium cell packet and the second ferric phosphate lithium cell packet, the first ferric phosphate lithium cell packet are compared
For new ferric phosphate lithium cell packet, the second ferric phosphate lithium cell packet is old ferric phosphate lithium cell packet.Control unit gets the first phosphorus
The electric current of the charge or discharge of sour lithium iron battery packet, the charging and discharging currents can be what current sensor detected, be also possible to
Detected by other current detecting parts.
S12, according to the on or off of current trigger first switch device, to adjust the resistance value of variable resistance unit.
The variable resistance unit is connected with the first ferric phosphate lithium cell packet, and variable resistance unit has first switch device in parallel
And first resistor.
Wherein, the detailed description about the specific structural details of variable resistance unit embodiment referring to fig. 1 to fig. 4,
This is with no restrictions.
Control unit determines triggering first switch device based on the size of the first ferric phosphate lithium cell packet charging and discharging currents
On or off, to realize the resistance value adjustment of variable resistance unit.For example, control unit can be charging and discharging currents and the first phosphorus
The overcurrent protection electric current of sour lithium iron battery packet is compared, and is also possible to be compared with a certain pre-set current value as defined in people,
When the conditions are met, the shutdown of a first switch device or two first switch device shutdowns in variable resistance unit are triggered, or more
A first switch device shutdown etc..Specifically triggering which first switch device shutdown is that control unit is based on charging and discharging currents
Size specifically determine.
The expansion method of ferric phosphate lithium cell packet provided by the embodiment of the utility model utilizes the first ferric phosphate lithium cell packet
Charging and discharging currents adjust the resistance value of variable resistance unit in real time, prevent the first ferric phosphate lithium cell packet from overcurrent protection occurs, thus
It solves the first ferric phosphate lithium cell packet and the second ferric phosphate lithium cell packet (i.e. new and old ferric phosphate lithium cell packet) is used in parallel
Problem.
The utility model embodiment additionally provides a kind of expansion method of ferric phosphate lithium cell packet, is used in control unit,
As shown in fig. 6, this method comprises:
S21 obtains the electric current of the charge or discharge of the first ferric phosphate lithium cell packet.
Wherein, the first ferric phosphate lithium cell packet is in parallel with the second ferric phosphate lithium cell packet, and the first LiFePO4 electricity
Internal resistance of the internal resistance of Chi Bao less than the second ferric phosphate lithium cell packet.The S11 of embodiment illustrated in fig. 5 is referred to, herein no longer
It repeats.
S22, according to the on or off of current trigger first switch device, to adjust the resistance value of variable resistance unit.
The variable resistance unit is connected with the first ferric phosphate lithium cell packet, and variable resistance unit has first switch device in parallel
And first resistor.
Specifically, which includes:
S221, judges whether electric current is greater than or equal to pre-set current value.
Control unit the charging and discharging currents for determining the first ferric phosphate lithium cell packet be greater than or equal to pre-set current value when,
Execute S222；Otherwise, it returns and executes S21, continue to test the charging and discharging currents of the first ferric phosphate lithium cell packet.
S222, triggering first switch device shutdown, to increase the resistance of variable resistance unit.
When the charging and discharging currents of the first ferric phosphate lithium cell packet are greater than or equal to pre-set current value, control unit triggering the
One switching device shutdown, to increase the resistance of variable resistance unit.
The expansion method of ferric phosphate lithium cell packet provided in this embodiment, when electric current is greater than or equal to pre-set current value,
Overcurrent protection may occur at this time for expression, by triggering first switch device shutdown, increase the resistance of variable resistance unit, with
The charging and discharging currents for reducing the first ferric phosphate lithium cell packet ensure that the first ferric phosphate lithium cell packet and the second ferric phosphate lithium cell
That wraps is used in parallel.
The utility model embodiment additionally provides a kind of expansion method of ferric phosphate lithium cell packet, as shown in fig. 7, comprises:
S31 obtains the electric current of the charge or discharge of the first ferric phosphate lithium cell packet.
Wherein, the first ferric phosphate lithium cell packet is in parallel with the second ferric phosphate lithium cell packet, and the first LiFePO4 electricity
Internal resistance of the internal resistance of Chi Bao less than the second ferric phosphate lithium cell packet.The S21 of embodiment illustrated in fig. 6 is referred to, herein no longer
It repeats.
S32, according to the on or off of current trigger first switch device, to adjust the resistance value of variable resistance unit.
The variable resistance unit is connected with the first ferric phosphate lithium cell packet, and variable resistance unit has first switch device in parallel
And first resistor.The S11 or S21 of Fig. 5 or embodiment illustrated in fig. 6 are referred to, details are not described herein.
S33 obtains the temperature of the first ferric phosphate lithium cell packet.
The temperature of first ferric phosphate lithium cell packet accessed by control unit can be what temperature sensor measurement arrived,
It can be what other temperature detection parts measured, only need to guarantee that it is able to detect that the temperature of the first ferric phosphate lithium cell packet i.e.
It can.
S34, according to the on or off of the second switch device in temperature triggered by-pass unit.
Wherein, the by-pass unit is in parallel with the first ferric phosphate lithium cell packet, and by-pass unit has concatenated second to open
Close device and 3rd resistor.
Power supply is controlled based on accessed temperature, determines conducting or the pass of the second switch device in triggering by-pass unit
It is disconnected.When the shutdown of second switch device, by-pass unit is equivalent to open circuit；When second switch break-over of device, in by-pass unit
3rd resistor is in parallel with the first ferric phosphate lithium cell packet.
The expansion method of ferric phosphate lithium cell packet provided by the embodiment of the utility model utilizes the first ferric phosphate lithium cell packet
Temperature adjust the access state of by-pass unit in real time, prevent the first ferric phosphate lithium cell packet and the second ferric phosphate when the temperature is excessively high
The mutual charging of lithium battery pack, to improve the first ferric phosphate lithium cell packet and the second ferric phosphate lithium cell packet (i.e. new and old phosphorus
Sour lithium iron battery packet) it is used in parallel when safety.
The utility model embodiment additionally provides a kind of expansion method of ferric phosphate lithium cell packet, as shown in Figure 8, comprising:
S41 obtains the electric current of the charge or discharge of the first ferric phosphate lithium cell packet.
Wherein, the first ferric phosphate lithium cell packet is in parallel with the second ferric phosphate lithium cell packet, and the first LiFePO4 electricity
Internal resistance of the internal resistance of Chi Bao less than the second ferric phosphate lithium cell packet.The S31 of embodiment illustrated in fig. 7 is referred to, herein no longer
It repeats.
S42, according to the on or off of current trigger first switch device, to adjust the resistance value of variable resistance unit.
The variable resistance unit is connected with the first ferric phosphate lithium cell packet, and variable resistance unit has first switch device in parallel
And first resistor.The S32 of embodiment illustrated in fig. 7 is referred to, details are not described herein.
S43 obtains the temperature of the first ferric phosphate lithium cell packet.
The S33 of embodiment illustrated in fig. 7 is referred to, details are not described herein.
S44, according to the on or off of the second switch device in temperature triggered by-pass unit.
Wherein, the by-pass unit is in parallel with the first ferric phosphate lithium cell packet, and by-pass unit has concatenated second to open
Close device and 3rd resistor.
Specifically, which includes:
S441, judges whether temperature is greater than or equal to preset temperature value.
When control power supply determines the temperature of the first ferric phosphate lithium cell packet more than or equal to preset temperature value, execute
S442；Otherwise, it returns and executes S43, continue to test the temperature of the first ferric phosphate lithium cell packet.Wherein, optionally, for lithium battery
For, preset temperature value is 45 DEG C.
S442 triggers second switch break-over of device.
When second switch break-over of device, the 3rd resistor in by-pass unit is in parallel with the first ferric phosphate lithium cell packet.The
One ferric phosphate lithium cell packet, the second ferric phosphate lithium cell packet and by-pass unit form closed circuit, two ferric phosphate lithium cells
Electric current caused by wrapping is back to ferric phosphate lithium cell packet by by-pass unit 30, is can be avoided at this time when temperature is higher, two
The mutual charging of a ferric phosphate lithium cell packet.
The expansion method of ferric phosphate lithium cell packet provided in this embodiment triggers second switch when the temperature is excessively high in real time
Break-over of device can be avoided the first ferric phosphate lithium cell packet and the second ferric phosphate lithium cell packet so that electric current flows through by-pass unit
Mutually charging further ensures the first ferric phosphate lithium cell packet and the safety used in parallel of the second ferric phosphate lithium cell packet.
Although being described in conjunction with the accompanying the embodiments of the present invention, those skilled in the art can not depart from this
Various modifications and variations are made in the case where the spirit and scope of utility model, such modifications and variations are each fallen within by appended power
Benefit requires within limited range.
Claims (6)
1. a kind of capacity-enlarging system of ferric phosphate lithium cell packet characterized by comprising
At least one variable resistance unit has first switch device and first resistor in parallel；Wherein, the variable resistance unit and
The series connection of one ferric phosphate lithium cell packet；The first ferric phosphate lithium cell packet is in parallel with the second ferric phosphate lithium cell packet, and the first phosphorus
The internal resistance of sour lithium iron battery packet is less than the internal resistance of the second ferric phosphate lithium cell packet；
Current detecting unit is electrically connected with control unit, for detecting the charge or discharge of the first ferric phosphate lithium cell packet
Electric current, and the electric current is sent to described control unit；
Described control unit is electrically connected with the first switch device and the current detecting unit；Described control unit is used
In being based on first switch break-over of device or shutdown described in the current trigger, to adjust the resistance value of the variable resistance unit.
2. capacity-enlarging system according to claim 1, which is characterized in that the first switch device is field-effect tube, described
The grid of first switch device is connect with described control unit, it is in parallel between the source electrode and drain electrode of the first switch device described in
First resistor.
3. capacity-enlarging system according to claim 2, which is characterized in that further include: with the variable resistance unit concatenated second
Resistance.
4. capacity-enlarging system according to claim 1, which is characterized in that further include:
By-pass unit has concatenated second switch device and 3rd resistor；Wherein, the by-pass unit and first phosphorus
Sour lithium iron battery packet is in parallel；
Temperature sensor is sent to the control for detecting the temperature of the first ferric phosphate lithium cell packet, and by the temperature
Unit processed, to trigger the on or off of the second switch device.
5. capacity-enlarging system according to claim 4, which is characterized in that described control unit is the first LiFePO4 electricity
The battery management system of Chi Bao.
6. capacity-enlarging system according to claim 5, which is characterized in that the battery management of the first ferric phosphate lithium cell packet
CAN communication is used between system and the battery management system of the second ferric phosphate lithium cell packet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920396795.0U CN209434344U (en) | 2019-03-26 | 2019-03-26 | The capacity-enlarging system of ferric phosphate lithium cell packet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920396795.0U CN209434344U (en) | 2019-03-26 | 2019-03-26 | The capacity-enlarging system of ferric phosphate lithium cell packet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209434344U true CN209434344U (en) | 2019-09-24 |
Family
ID=67978980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920396795.0U Expired - Fee Related CN209434344U (en) | 2019-03-26 | 2019-03-26 | The capacity-enlarging system of ferric phosphate lithium cell packet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209434344U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802189A (en) * | 2019-03-26 | 2019-05-24 | 成都众希新能源科技有限公司 | The capacity-enlarging system and expansion method of ferric phosphate lithium cell packet |
-
2019
- 2019-03-26 CN CN201920396795.0U patent/CN209434344U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802189A (en) * | 2019-03-26 | 2019-05-24 | 成都众希新能源科技有限公司 | The capacity-enlarging system and expansion method of ferric phosphate lithium cell packet |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105122578A (en) | Balance correction device and electricity storage device | |
| CN104935051A (en) | A series battery equalization circuit | |
| CN216389527U (en) | Battery heating system, battery pack and electric device | |
| CN105305382A (en) | Charge and discharge protective circuit for battery | |
| CN104505905A (en) | Single-charged and series-discharged lithium battery pack | |
| CN107040021A (en) | A kind of battery modules series connection management circuit | |
| CN109802189A (en) | The capacity-enlarging system and expansion method of ferric phosphate lithium cell packet | |
| CN209434344U (en) | The capacity-enlarging system of ferric phosphate lithium cell packet | |
| CN109703369A (en) | A kind of electric vehicle lead-acid battery group protective module | |
| CN208782521U (en) | A kind of wake-up circuit and battery management system | |
| CN107154665A (en) | A kind of discharge and recharge combiner and electric power system | |
| CN205160049U (en) | Battery charge and discharge protection circuit | |
| CN201584798U (en) | Electric balance structure of lithium battery module | |
| CN108649646A (en) | Charging control circuit and its control method based on adjustable battery pack cascaded structure | |
| CN203456930U (en) | Compound energy system | |
| CN201667372U (en) | Circuit used for battery management system | |
| CN206259456U (en) | A kind of novel battery bag with communication function | |
| CN214798989U (en) | Multiplexing OVP control circuit for authenticating single charging fault through IEC62368 | |
| CN102957175B (en) | Multi-cell serially-connected lithium battery pack equalization and protection system | |
| CN210780179U (en) | Charge-discharge current-sharing circuit of BMS | |
| CN101521390A (en) | Battery pack charge balancing circuit | |
| CN204243798U (en) | Lithium battery group charging circuit | |
| CN208723568U (en) | A kind of lithium battery group charging and discharging protection device | |
| CN209938374U (en) | Lithium battery management protection circuit | |
| CN209642357U (en) | A kind of lithium battery voltage monitoring and protecting device based on electric resistance partial pressure type |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190924 Termination date: 20200326 |