CN108780927A - Battery pack equalization methods, battery management system and battery system - Google Patents
Battery pack equalization methods, battery management system and battery system Download PDFInfo
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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Abstract
一种电池包均衡方法、电池管理系统及电池系统。所述均衡方法包括：通过检测磷酸铁锂电池包中各电池单元的电压数据，并根据各电池单元的电压数据，获取磷酸铁锂电池包的荷电状态(S101)，以及，获取电压数据中的最小电压值(S102)；从而，判断荷电状态是否位于10％～40％，并分别将磷酸铁锂电池包中各电池单元的电压数据与最小电压值之间的差值与预设的电压阈值进行比较(S103)；若判断出荷电状态位于10％～40％，且存在电压数据与最小电压值之间的差值大于或者等于电压阈值的电池单元，对该电池单元执行放电(S104)。通过所述均衡方法提高了磷酸铁锂电池包中各电池单元之间荷电状态的一致性，延长了磷酸铁锂电池包的使用寿命。
A battery pack balancing method, a battery management system and a battery system. The equalization method includes: by detecting the voltage data of each battery cell in the lithium iron phosphate battery pack, and according to the voltage data of each battery cell, obtaining the state of charge of the lithium iron phosphate battery pack (S101), and obtaining the voltage data in the voltage data The minimum voltage value (S102); thus, determine whether the state of charge is between 10% and 40%, and respectively compare the difference between the voltage data of each battery cell in the lithium iron phosphate battery pack and the minimum voltage value with the preset Comparing the voltage threshold (S103); if it is determined that the state of charge is between 10% and 40%, and there is a battery unit whose voltage data and the minimum voltage value are greater than or equal to the voltage threshold, discharge the battery unit (S104 ). The consistency of the state of charge among the battery cells in the lithium iron phosphate battery pack is improved by the balancing method, and the service life of the lithium iron phosphate battery pack is prolonged.
Description
The present invention relates to battery technology field more particularly to a kind of battery pack equalization methods, battery management system and battery system.
Ferric phosphate lithium cell packet (LiFePO4Battery Pack) there is typical charge and discharge platform, this excellent electrical property and the characteristic in high circulation service life, high security, so that the product is widely used in electric car and energy storage field.
Lithium iron phosphate battery system is made of ferric phosphate lithium cell packet and battery management system.Ferric phosphate lithium cell packet is concatenated by a fairly large number of battery unit or in parallel or mixed connection forms.Because there is variation in battery unit, thus the state-of-charge (State of Charge, SoC) between battery unit is not fully identical in raw material and manufacturing process.Thus lead to lithium iron phosphate battery system in use, by charge, discharge repeatedly and calendar storage, charged unbalanced degree between each battery unit is gradually increased, the power capability of lithium iron phosphate battery system and the performance of utilisable energy are directly affected, the service life of ferric phosphate lithium cell packet is reduced.
[summary of the invention]
In view of this, the present invention provides a kind of battery pack equalization methods, battery management system and battery system, the consistency of state-of-charge between each battery unit in ferric phosphate lithium cell packet is improved, the service life of ferric phosphate lithium cell packet is extended.
The one side of the embodiment of the present invention provides a kind of battery pack equalization methods, comprising:
The voltage data of each battery unit in ferric phosphate lithium cell packet is detected, and according to the voltage data of each battery unit, obtains the state-of-charge of the ferric phosphate lithium cell packet；
Obtain the minimum amount of voltage that in the voltage data；
Judge whether the state-of-charge is located at 10%~40%, and is respectively compared the difference in the ferric phosphate lithium cell packet between the voltage data of each battery unit and the minimum amount of voltage that with preset voltage threshold；
If judging, the state-of-charge is located at 10%~40%, and there are the battery unit that the difference between voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold, the battery unit for being more than or equal to the voltage threshold to the difference in the ferric phosphate lithium cell packet between voltage data and the minimum amount of voltage that executes electric discharge.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, the method also includes:
When the voltage data of the battery unit to discharge in ferric phosphate reason battery pack reaches specified requirements, stop the electric discharge for being more than or equal to the battery unit of the voltage threshold to the difference in ferric phosphate reason battery pack between voltage data and the minimum amount of voltage that.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, the specified requirements include: that the voltage data of the battery unit to discharge in the ferric phosphate reason battery pack is consistent with the minimum amount of voltage that.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation detects the voltage data of each battery unit in ferric phosphate lithium cell packet, comprising:
In the hibernation mode, the voltage data of each battery unit in ferric phosphate lithium cell packet is detected；
Wherein, the suspend mode includes that the ferric phosphate lithium cell packet does not have input energy or output energy.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, each battery unit includes a battery cell, alternatively, each battery unit includes at least two battery cells in parallel.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, each battery cell includes the lithium-ion battery monomer that solid content of the LiFePO4 in cathode active material is more than or equal to 90% in the ferric phosphate lithium cell packet.
The one side of the embodiment of the present invention provides a kind of battery management system, comprising:
Detection module, for detecting the voltage data of each battery unit in ferric phosphate lithium cell packet；
Electricity estimation block obtains the ferric phosphate lithium cell for the voltage data according to each battery unit
The state-of-charge of packet；
Balance module, for obtaining the minimum amount of voltage that in the voltage data；And judge whether the state-of-charge is located at 10%~40%, and be respectively compared the difference in the ferric phosphate lithium cell packet between the voltage data of each battery unit and the minimum amount of voltage that with preset voltage threshold；And, if judging, the state-of-charge is located at 10%~40%, and there are the battery unit that the difference between voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold, the battery unit for being more than or equal to the voltage threshold to the difference in the ferric phosphate lithium cell packet between voltage data and the minimum amount of voltage that executes electric discharge.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, the balance module are also used to:
When the voltage data of the battery unit to discharge in ferric phosphate reason battery pack reaches specified requirements, stop the electric discharge for being more than or equal to the battery unit of the voltage threshold to the difference in ferric phosphate reason battery pack between voltage data and the minimum amount of voltage that.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, the specified requirements include: that the voltage data of the battery unit to discharge in the ferric phosphate reason battery pack is consistent with the minimum amount of voltage that.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, the detection module are specifically used for: in the hibernation mode, detecting the voltage data of each battery unit in ferric phosphate lithium cell packet；
Wherein, the suspend mode includes that the ferric phosphate lithium cell packet does not have input energy or output energy.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, each battery unit includes a battery cell, alternatively, each battery unit includes at least two battery cells in parallel.
The one side of the embodiment of the present invention provides a kind of battery system, including ferric phosphate lithium cell packet and above-mentioned battery management system.
The aspect and any possible implementation manners as described above, it is further provided a kind of implementation includes the lithium-ion battery monomer that solid content of the LiFePO4 in cathode active material is more than or equal to 90% in the ferric phosphate lithium cell packet.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantages that
In technical solution provided by the embodiment of the present invention, pass through the difference between the voltage data and minimum amount of voltage that of each battery unit in the state-of-charge and ferric phosphate lithium cell packet according to ferric phosphate lithium cell packet, judge whether to meet balanced entry condition, if meeting balanced entry condition, i.e. state-of-charge is in low side (i.e. state-of-charge is located at 10%~40%), and there are the battery units that the difference between voltage data and minimum amount of voltage that is more than or equal to voltage threshold, then discharge the battery unit for meeting the equilibrium entry condition, to make the voltage of the higher battery unit of voltage data in ferric phosphate lithium cell packet reach unanimity with minimum amount of voltage that, reduce the charged unbalanced degree between each battery unit, effectively realize the charged equilibrium between battery unit, it is led so as to avoid charged unbalanced degree is larger The problem of performance of the power capability of the lithium iron phosphate battery system of cause and utilisable energy, extend the service life of ferric phosphate lithium cell packet.Moreover, can effectively improve the equalization efficiency of ferric phosphate lithium cell packet by low side equilibrium.
To describe the technical solutions in the embodiments of the present invention more clearly, the drawings to be used in the embodiments are briefly described below, apparently, drawings in the following description are only some embodiments of the invention, for those of ordinary skill in the art, without any creative labor, other attached drawings be can also be obtained according to these attached drawings.
Fig. 1 is the flow diagram of the embodiment one of battery pack equalization methods provided by the embodiment of the present invention；
Fig. 2 is the flow diagram of the embodiment two of battery pack equalization methods provided by the embodiment of the present invention；
Fig. 3 is the graph of relation of the state-of-charge of ferric phosphate lithium cell packet and voltage provided by the embodiment of the present invention；
Fig. 4 is the flow diagram of the embodiment three of battery pack equalization methods provided by the embodiment of the present invention；
Fig. 5 is the functional block diagram of the embodiment one of battery management system provided by the embodiment of the present invention；
Fig. 6 is the functional block diagram of the embodiment two of battery management system provided by the embodiment of the present invention；
Fig. 7 is the functional block diagram of battery system provided by the embodiment of the present invention.
For a better understanding of the technical solution of the present invention, the embodiment of the present invention is described in detail with reference to the accompanying drawing.
It will be appreciated that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, all other embodiment obtained by those of ordinary skill in the art without making creative efforts, shall fall within the protection scope of the present invention.
The term used in embodiments of the present invention is only to be not intended to limit the invention merely for for the purpose of describing particular embodiments.It is also intended to including most forms, unless the context clearly indicates other meaning in the embodiment of the present invention and the "an" of singular used in the attached claims, " described " and "the".
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, indicate may exist three kinds of relationships, for example, A and/or B, can indicate: individualism A exists simultaneously A and B, these three situations of individualism B.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".
Depending on context, word as used in this " if " can be construed to " ... when " or " when ... " or " in response to determination " or " in response to detection ".Similarly, depending on context, phrase " if it is determined that " or " if detection (condition or event of statement) " can be construed to " when determining " or " in response to determination " or " when detection (condition or event of statement) " or " in response to detection (condition or event of statement) ".
Ferric phosphate lithium cell packet has typical charge and discharge platform, this excellent electrical property and the characteristic in high circulation service life, high security, and the product is made to be widely used in electric car and energy storage field.Lithium iron phosphate battery system is made of ferric phosphate lithium cell packet and battery management system.Ferric phosphate lithium cell packet is concatenated by a fairly large number of battery unit or in parallel or mixed connection forms.Because there is variation in battery unit, thus the state-of-charge between battery unit is not fully identical in raw material and manufacturing process.Thus lead to lithium iron phosphate battery system in use, by charging, discharging repeatedly and calendar stores, the charged unbalanced degree between each battery unit is gradually increased, directly affect the power capability of lithium iron phosphate battery system with
And the performance of utilisable energy, reduce the service life of ferric phosphate lithium cell packet.Therefore, it is quite necessary to be carried out to ferric phosphate lithium cell packet balanced.
Ferric phosphate lithium cell packet is carried out there are mainly two types of balanced methods, one is the method for high-end equilibrium, another kind is the method for low side equilibrium.It should be noted that low side equilibrium refers to starting equilibrium in the case where state-of-charge is located at 10%~40% and pressure difference meets balanced entry condition, high-end equilibrium refers to starting equilibrium in the case where state-of-charge is located at 90%~100% and pressure difference meets balanced entry condition.Before choosing equalization methods, if pair dry-eye disease has done different experiments, as shown in table 1, high-end equilibrium has used three ferric phosphate lithium cell sample packets to test, before high-end equilibrium, charged unbalanced degree is respectively 17.1%, 27.6%, 22.9%, and after high-end equilibrium, the charged unbalanced degree of three samples becomes 13.5%, 20.4%, 22.9% respectively.Average voltage and the difference between minimum amount of voltage that, i.e. pressure difference in table drop to 5mV, 4mV, 6mV respectively from 24mV, 29mV, 7mV.It can be understood that, charged unbalanced degree Δ SoC can have following two calculation, one is the difference between the average value of state-of-charge of each battery unit in ferric phosphate lithium cell packet and the minimum value of state-of-charge, another kind is the difference in ferric phosphate lithium cell packet between the maximum value of the state-of-charge of each battery unit and the minimum value of state-of-charge.The charged unbalanced degree mentioned in the present embodiment is the difference between the average value of state-of-charge and the minimum value of state-of-charge using each battery unit in ferric phosphate lithium cell packet.When carrying out balanced to ferric phosphate lithium cell packet using the method for low side equilibrium, five samples, and two of them sample are used, i.e. sample 2 and sample 3 is identical as the sample used when high-end equilibrium.As can be seen from Table 1, five samples are in such a way that low side is balanced, charged unbalanced degree is by 27.6%, 22.9%, 6.1%, 5.4%, 4.8%, 2.0%, 1.6%, 1.8%, 1.3%, 1.1% is dropped to respectively, pressure difference drops to 8mV, 8mV, 6mV, 4mV, 4mV by 16mV, 62mV, 26mV, 24mV, 18mV respectively.It can be seen that low side equilibrium compared with high-end equilibrium, becomes apparent the improvement of unbalanced degree charged between each battery unit in ferric phosphate lithium cell packet.Therefore the effective equalization methods that following embodiment is related to all are the methods of low side equilibrium.
Table 1
Embodiment one
The embodiment of the present invention provides a kind of battery pack equalization methods, referring to FIG. 1, its flow diagram for the embodiment one of battery pack equalization methods provided by the embodiment of the present invention, as shown, method includes the following steps:
S101 detects the voltage data of each battery unit in ferric phosphate lithium cell packet, and according to the voltage data of each battery unit, obtains the state-of-charge of the ferric phosphate lithium cell packet.
S102 obtains the minimum amount of voltage that in the voltage data.
S103, judges whether the state-of-charge is located at 10%~40%, and is respectively compared the difference in the ferric phosphate lithium cell packet between the voltage data of each battery unit and the minimum amount of voltage that with preset voltage threshold.
S104, if judging, the state-of-charge is located at 10%~40%, and there are the battery unit that the difference between voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold, the battery unit for being more than or equal to the voltage threshold to the difference in the ferric phosphate lithium cell packet between voltage data and the minimum amount of voltage that executes electric discharge.
Embodiment two
Referring to FIG. 2, its flow diagram for the embodiment two of battery pack equalization methods provided by the embodiment of the present invention, the present embodiment is a kind of concrete methods of realizing of embodiment one.As shown, method includes the following steps:
S201 detects the voltage data of each battery unit in ferric phosphate lithium cell packet, and according to each battery list
The voltage data of member, obtains the state-of-charge of the ferric phosphate lithium cell packet.
Specifically, in the embodiment of the present invention voltage data of each battery unit in ferric phosphate lithium cell packet can be detected in the hibernation mode.
It should be noted that the suspend mode refers to that ferric phosphate lithium cell packet does not have input energy or output energy.
It should be noted that being usually concatenated by a fairly large number of battery unit in the embodiment of the present invention, in ferric phosphate lithium cell packet or in parallel or mixed connection forms.It wherein, may include a battery cell in each battery unit, alternatively, also may include at least two battery cells in parallel in each battery unit, that is, each battery unit can be and be composed in parallel by multiple battery cells.
In embodiments of the present invention, each battery cell of ferric phosphate lithium cell packet includes the lithium-ion battery monomer that solid content of the LiFePO4 in cathode active material is more than or equal to 90%.
During the present invention is implemented, before the voltage data for the battery unit that can be discharged in the ferric phosphate lithium cell packet reaches preset condition, discharge process can be completed intermittently, namely, it discharges after continuing preset duration 1, ferric phosphate reason battery pack enters suspend mode, and the duration of suspend mode is maintained to reach preset duration 2, it is then wake up battery management system, re-executes the balancing procedure of S201~S207.Wherein, preset duration 1 and preset duration 2 can comprehensively consider and be configured according to the hardware feature of the executing subject of equalization operation and equalization efficiency, such as, it can make 5 minutes, 10 minutes, 1 hour or 3 hours etc., preset duration 1 can also be different identical or in this way with preset duration 2.
When ferric phosphate lithium cell packet in the hibernation mode when, the state-of-charge data of each battery unit in ferric phosphate lithium cell packet are detected, what state-of-charge indicated is the ratio of the capacity of the residual capacity and its fully charged state after battery is lain idle using a period of time or for a long time, can be indicated using percentage.
In the embodiment of the present invention, the voltage data of each battery unit in ferric phosphate lithium cell packet can be detected and be recorded, the voltage data of such as each battery unit can successively be denoted as U1、U2、......、UN, wherein N indicates the quantity of battery unit in ferric phosphate lithium cell packet.
In the embodiment of the present invention, in detecting ferric phosphate lithium cell packet after the voltage data of each battery unit, ferric phosphate can be got according to the voltage data of battery unit each in ferric phosphate lithium cell packet quickly
The state-of-charge of lithium battery pack.
It should be noted that state-of-charge refer to ferric phosphate lithium cell packet using a period of time or for a long time lay up after, remaining capacity and it is fully charged after electricity ratio, can use percentage expression.
S202 obtains the minimum amount of voltage that in the voltage data.
For example, can be ranked up according to voltage data of the descending sequence to each battery unit, to obtain wherein minimum amount of voltage that.Alternatively, can also be ranked up according to voltage data of the ascending sequence to each battery unit, to obtain wherein minimum amount of voltage that.
S203, judges whether the state-of-charge is located at 10%~40%, and is respectively compared the difference in the ferric phosphate lithium cell packet between the voltage data of each battery unit and the minimum amount of voltage that with preset voltage threshold.If judging, the state-of-charge is located at 10%~40%, and there are the battery unit that the difference between voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold, executes S204, conversely, executing S207.
Specifically, after the state-of-charge for getting ferric phosphate lithium cell packet, further judge whether the state-of-charge is located at 10%~40%, simultaneously, the difference between the voltage data and minimum amount of voltage that of each battery unit is calculated separately, the pressure difference of such as each battery unit is expressed as Δ U=Ui-min{U1, U2, U3..., UN, wherein i=1,2,3 ..., N；Then calculated each difference is compared with preset voltage threshold respectively.
If state-of-charge is located at 10%~40%, and there are the battery units that the difference between at least one voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold, illustrate that the state-of-charge of ferric phosphate lithium cell packet is in low side, meet balanced entry condition, and illustrate that the difference between the voltage data of at least one battery unit and minimum amount of voltage that is larger, it needs to execute electric discharge to the battery unit in ferric phosphate lithium cell packet, so continuing to execute S204.Conversely, executing S207 in the case of other.
Wherein, other situations include: that state-of-charge is located at 10%~40%, but there is no the battery units that the difference between voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold.Alternatively, state-of-charge is not located at 10%~40%, but there are the battery units that the difference between voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold.Alternatively, state-of-charge is not located at 10%~40%, and there is no the differences between voltage data and the minimum amount of voltage that be more than or equal to the voltage threshold
Battery unit.
It should be noted that, difference between the voltage data of all battery units and the minimum amount of voltage that is both less than the voltage threshold, illustrate that the difference between the voltage data of the battery unit and minimum amount of voltage that is smaller, does not need to execute charged equilibrium, therefore execute S207.And, if state-of-charge is not located at 10%~40%, illustrate that the state-of-charge of ferric phosphate lithium cell packet is not on low side, it is likely to be at other charged sections (such as 0~10% or 40%~100%), it is unsatisfactory for balanced entry condition, it does not need to execute electric discharge to the battery unit in ferric phosphate lithium cell packet, so executing S207.
Wherein, preset voltage threshold can be determined by testing.For example, preset voltage threshold can be equal to 8mV.
It should be noted that, in the embodiment of the present invention, pass through the difference between the voltage data and minimum amount of voltage that of each battery unit in ferric phosphate lithium cell packet, and the state-of-charge of ferric phosphate lithium cell packet, to determine whether meeting balanced entry condition, if meeting balanced entry condition, the equalization operation of battery unit is carried out.Conversely, if being unsatisfactory for balanced entry condition, alternatively, just terminating current process without the equalization operation of battery unit.
Referring to FIG. 3, it is the state-of-charge of ferric phosphate lithium cell packet and the graph of relation of voltage provided by the embodiment of the present invention, which can be tested to obtain by charging/discharging apparatus to the battery unit in ferric phosphate lithium cell packet.As shown in Figure 3, the state-of-charge of ferric phosphate lithium cell packet is at 10%~40% section, state-of-charge and voltage have strong correlation, therefore, in this section, this mode of state-of-charge is estimated and corrected according to the voltage data of each battery unit, and the accuracy of calculated state-of-charge can be improved, thus portfolio effect is good.In 10%~40% section, it is preferred that state-of-charge section can be 15%~35%.
It should be noted that, the state-of-charge of ferric phosphate lithium cell packet is at 90%~100%, the section is relatively narrow, and the otherness in the polarization characteristic and ferric phosphate lithium cell packet due to LiFePO 4 material between battery unit, voltage is down to platform area, pressure difference is smaller, it is not easy to which implementation result is bad after triggering equilibrium or triggering are balanced.In platform area 40%~90%, state-of-charge and voltage almost non-correlation, cannot trigger equilibrium or can cause accidentally balanced state-of-charge in the area.State-of-charge is at 0~10%, to prevent battery unit over-discharge in ferric phosphate lithium cell packet, it is not possible to which therefore being used as Equilibrium Interval will use low
Balanced method is held to carry out equilibrium to the battery unit in ferric phosphate lithium cell packet it is necessary to carry out when the state-of-charge of ferric phosphate lithium cell packet is 10%~40%.
S204, the battery unit for being more than or equal to the voltage threshold to the difference in the ferric phosphate lithium cell packet between voltage data and the minimum amount of voltage that execute electric discharge.
Specifically, in the embodiment of the present invention, it is located at 10%~40% in the state-of-charge for judging ferric phosphate lithium cell packet, and there are when the battery unit that the difference in ferric phosphate lithium cell packet between voltage data and minimum amount of voltage that is more than or equal to voltage threshold, the battery unit for being more than or equal to voltage threshold to the difference in the ferric phosphate lithium cell packet between voltage data and minimum amount of voltage that executes electric discharge, so as to pass through electric discharge, so that the higher battery unit of voltage is carried out after discharge in ferric phosphate lithium cell packet Central Plains, the voltage of voltage data and the smallest battery unit of voltage data in ferric phosphate lithium cell packet reaches unanimity, realize the equilibrium of ferric phosphate lithium cell packet, reduce the charged unbalanced degree of ferric phosphate lithium cell packet.
S205, judges whether the voltage data of the battery unit to discharge in the ferric phosphate reason battery pack reaches specified requirements, if so, S206 is executed, if not, executing S201.
Specifically, in the embodiment of the present invention, the battery unit that difference in ferric phosphate lithium cell packet between voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold executes after electric discharge, also need to judge whether the voltage data of the battery unit to discharge in the ferric phosphate reason battery pack reaches specified requirements, if it is judged that the voltage data of the battery unit to discharge in the ferric phosphate reason battery pack reaches specified requirements, S206 is executed., whereas if judging that the voltage data of the battery unit to discharge in the ferric phosphate reason battery pack does not reach specified requirements, S201 is executed, that is, re-starting the operation such as detection, estimation, judgement and equilibrium.
During a concrete implementation, the specified requirements may include: that the voltage data of the battery unit to discharge in the ferric phosphate reason battery pack is consistent with the minimum amount of voltage that.
S206 stops the electric discharge for being more than or equal to the battery unit of the voltage threshold to the difference in ferric phosphate reason battery pack between voltage data and the minimum amount of voltage that.
Specifically, in the embodiment of the present invention, the battery unit that difference in ferric phosphate lithium cell packet between voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold executes after electric discharge, when the voltage data of the battery unit to discharge in determining ferric phosphate reason battery pack also being needed to reach specified requirements, stopping pair
The electric discharge for the battery unit that difference in the ferric phosphate reason battery pack between voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold realizes the charged equilibrium of ferric phosphate lithium cell packet after stopping to the electric discharge of the battery unit.
S207 does not execute electric discharge to the battery unit in the ferric phosphate lithium cell packet, terminates process.
Embodiment three
Referring to FIG. 4, its flow diagram for the embodiment three of battery pack equalization methods provided by the embodiment of the present invention, the present embodiment is another concrete methods of realizing of embodiment one.As shown, method includes the following steps:
S401, ferric phosphate lithium cell packet is fully charged, and the state-of-charge for being then discharged to ferric phosphate lithium cell packet is located at 20%~25%.
S402 detects and records the voltage data of concatenated 100 economize on electricity pool unit in ferric phosphate lithium cell packet, be denoted as U in the hibernation modeN, N is equal to 1,2,3 ..., 100.
S403 calculates the difference in ferric phosphate lithium cell packet between the voltage data and minimum amount of voltage that of each battery unit.
S404, the battery unit to the difference in ferric phosphate lithium cell packet between voltage data and minimum amount of voltage that greater than 8mV discharge.
S405, balanced at interval of the low side for re-executing a ferric phosphate lithium cell packet for a period of time, i.e., execution S401~S405 completes the equilibrium of ferric phosphate lithium cell packet when the voltage data and voltage minimum of the higher battery unit of voltage data reach unanimity.
The embodiment of the present invention, which further provides, realizes the Installation practice of each step and method in above method embodiment.
Referring to FIG. 5, its functional block diagram for the embodiment one of battery management system provided by the embodiment of the present invention.As shown, the battery management system includes:
Detection module 51, for detecting the voltage data of each battery unit in ferric phosphate lithium cell packet；
Electricity estimation block 52 obtains the state-of-charge of the ferric phosphate lithium cell packet for the voltage data according to each battery unit；
Balance module 53, for obtaining the minimum amount of voltage that in the voltage data；And judge the lotus
Whether electricity condition is located at 10%~40%, and is respectively compared the difference in the ferric phosphate lithium cell packet between the voltage data of each battery unit and the minimum amount of voltage that with preset voltage threshold；And, if judging, the state-of-charge is located at 10%~40%, and there are the battery unit that the difference between voltage data and the minimum amount of voltage that is more than or equal to the voltage threshold, the battery unit for being more than or equal to the voltage threshold to the difference in the ferric phosphate lithium cell packet between voltage data and the minimum amount of voltage that executes electric discharge.
Optionally, the balance module 53, is also used to:
When the voltage data of the battery unit to discharge in ferric phosphate reason battery pack reaches specified requirements, stop the electric discharge for being more than or equal to the battery unit of the voltage threshold to the difference in ferric phosphate reason battery pack between voltage data and the minimum amount of voltage that.
Preferably, the specified requirements includes: that the voltage data of the battery unit to discharge in the ferric phosphate reason battery pack is consistent with the minimum amount of voltage that.
Preferably, the detection module 51, is specifically used for: in the hibernation mode, detecting the voltage data of each battery unit in ferric phosphate lithium cell packet；Wherein, the suspend mode includes that the ferric phosphate lithium cell packet does not have input energy or output energy.
Preferably, each battery unit includes a battery cell, alternatively, each battery unit includes at least two battery cells in parallel.
Preferably, each battery cell includes lithium-ion battery monomer of solid content of the LiFePO4 in cathode active material more than or equal to 90% in the ferric phosphate lithium cell packet.
Fig. 1, Fig. 2 or method shown in Fig. 4 are able to carry out by each unit in this present embodiment, the part that the present embodiment is not described in detail can refer to the related description to Fig. 1, Fig. 2 or Fig. 4.
Referring to FIG. 6, its functional block diagram for the embodiment two of battery management system provided by the embodiment of the present invention.As shown, the battery management system can also include: charging module 54, for ferric phosphate lithium cell packet is fully charged, the state-of-charge for being then discharged to ferric phosphate lithium cell packet is located at 10%~40%.
Referring to FIG. 7, its functional block diagram for battery system provided by the embodiment of the present invention.As shown in fig. 7, the battery system includes: ferric phosphate lithium cell packet 70 and above-mentioned battery management system 71.
It is understood that including LiFePO4 in the ferric phosphate lithium cell packet in cathode active material
Solid content be more than or equal to 90% lithium-ion battery monomer.
The technical solution of the embodiment of the present invention has the advantages that
In technical solution provided by the embodiment of the present invention, pass through the difference between the voltage data and minimum amount of voltage that of each battery unit in the state-of-charge and ferric phosphate lithium cell packet according to ferric phosphate lithium cell packet, judge whether to meet balanced entry condition, if meeting equilibrium asks condition, i.e. state-of-charge is in low side (state-of-charge is located at 10%~40%), and there are the battery units that the difference between voltage data and minimum amount of voltage that is more than or equal to voltage threshold, then discharge the battery unit for meeting the equilibrium entry condition, to make the voltage of the higher battery unit of voltage data in ferric phosphate lithium cell packet reach unanimity with minimum amount of voltage that, reduce the charged unbalanced degree between each battery unit, effectively realize the charged equilibrium between battery unit, so as to avoid it is charged it is unbalanced degree it is larger caused by The problem of performance of the power capability of lithium iron phosphate battery system and utilisable energy, extend the service life of ferric phosphate lithium cell packet.Moreover, can effectively improve the equalization efficiency of ferric phosphate lithium cell packet by low side equilibrium.
In addition, technical solution provided by the embodiment of the present invention in the prior art in other state-of-charges (state-of-charge is located at 40%~100%) starting equilibriums compared with, charged portfolio effect is more preferable, and it can prevent accidentally balanced, improve portfolio effect, the charged unbalanced degree between battery unit is reduced to the full extent, improves the inconsistency between battery unit, to extend the service life of ferric phosphate lithium cell packet.
It is apparent to those skilled in the art that for convenience and simplicity of description, the specific work process of the system, apparatus, and unit of foregoing description can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided by the present invention, it should be understood that disclosed system, device and method may be implemented in other ways.Such as, the apparatus embodiments described above are merely exemplary, such as, the division of the unit, only a kind of logical function partition, there may be another division manner in actual implementation, such as, multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed mutual coupling, direct-coupling or communication connection can be through some interfaces, the indirect coupling or communication connection of device or unit, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, and component shown as a unit may or may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
In addition, the functional units in various embodiments of the present invention may be integrated into one processing unit, it is also possible to each unit and physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated unit both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit being realized in the form of SFU software functional unit, can store in a computer readable storage medium.Above-mentioned SFU software functional unit is stored in a storage medium, it uses including some instructions so that a computer installation (can be personal computer, server or network equipment etc.) or processor (Processor) execute the part steps of each embodiment the method for the present invention.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), the various media that can store program code such as random access memory (Random Access Memory, RAM), magnetic or disk.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, and all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included within the scope of the present invention.
Claims (13)
Applications Claiming Priority (1)
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| PCT/CN2016/074116 WO2017139967A1 (en) | 2016-02-19 | 2016-02-19 | Battery pack balancing method, battery management system and battery system |
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| CN108780927A true CN108780927A (en) | 2018-11-09 |
| CN108780927B CN108780927B (en) | 2021-06-25 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995102A (en) * | 2019-03-01 | 2019-07-09 | 中国第一汽车股份有限公司 | A power battery balancing system and control method for electric vehicles |
| CN115236536A (en) * | 2021-04-23 | 2022-10-25 | 北汽福田汽车股份有限公司 | Method for evaluating voltage consistency after lithium iron phosphate battery is installed on vehicle and vehicle |
| CN115603351A (en) * | 2022-12-13 | 2023-01-13 | 麦田能源有限公司（Cn） | Energy storage system processing method and device, processor and electronic equipment |
| CN115972976A (en) * | 2023-01-30 | 2023-04-18 | 北京新能源汽车股份有限公司 | A method and device for matching a battery system equalization scheme |
| FR3154879A1 (en) | 2023-10-30 | 2025-05-02 | Renault S.A.S | Device for balancing the charge of cells in a battery, motor vehicle and associated method |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111490304B (en) * | 2020-05-18 | 2021-09-07 | 重庆金康动力新能源有限公司 | Battery equalization enabling method and device, storage medium and battery pack |
| CN115117483B (en) * | 2021-03-23 | 2024-12-31 | 宁德新能源科技有限公司 | Method for extending battery life, electric device and storage medium |
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| CN113839439B (en) * | 2021-08-27 | 2024-05-31 | 北京机械设备研究所 | Full-period battery pack balance control method, device and storage medium |
| CN115372855A (en) * | 2022-09-01 | 2022-11-22 | 奇瑞新能源汽车股份有限公司 | Consistency testing method and device for power battery |
| CN118399463B (en) * | 2024-06-28 | 2024-11-26 | 上海思格源智能科技有限公司 | Energy storage system control method, energy storage system control device and energy storage system |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040135544A1 (en) * | 2002-11-25 | 2004-07-15 | Tiax, Llc | System and method for determining and balancing state of charge among series connected electrical energy storage units |
| US20110156641A1 (en) * | 2009-12-31 | 2011-06-30 | Tesla Motors, Inc. | State of charge range |
| CN201956725U (en) * | 2011-03-18 | 2011-08-31 | 广东国光电子有限公司 | Equalizing device of power iron phosphate lithium battery pack |
| CN102355031A (en) * | 2011-10-29 | 2012-02-15 | 重庆大学 | Active equalizing charging method and device for LiFePO4 power battery packs |
| CN103048626A (en) * | 2012-12-17 | 2013-04-17 | 惠州市亿能电子有限公司 | Method for accurately estimating SOC (State of Charge) |
| CN103081281A (en) * | 2010-10-15 | 2013-05-01 | 三洋电机株式会社 | Power management system |
| CN103633384A (en) * | 2012-08-30 | 2014-03-12 | 石家庄杰泰特动力能源有限公司 | Method for continuous passive balance of operation battery cores in battery pack |
| CN103683403A (en) * | 2013-12-04 | 2014-03-26 | 奇瑞汽车股份有限公司 | Method and device for balancing battery capacity of battery system and electric automobile |
| CN104505550A (en) * | 2014-12-25 | 2015-04-08 | 宁德时代新能源科技有限公司 | Passive equalizing method and system for lithium iron phosphate battery pack |
| CN104600387A (en) * | 2015-02-05 | 2015-05-06 | 青海时代新能源科技有限公司 | Active equalization method and active equalization system of lithium iron phosphate battery pack |
| CN105162206A (en) * | 2015-09-30 | 2015-12-16 | 环旭电子股份有限公司 | Rechargeable battery charging control method |
-
2016
- 2016-02-19 WO PCT/CN2016/074116 patent/WO2017139967A1/en active Application Filing
- 2016-02-19 CN CN201680081297.6A patent/CN108780927B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040135544A1 (en) * | 2002-11-25 | 2004-07-15 | Tiax, Llc | System and method for determining and balancing state of charge among series connected electrical energy storage units |
| US20110156641A1 (en) * | 2009-12-31 | 2011-06-30 | Tesla Motors, Inc. | State of charge range |
| CN103081281A (en) * | 2010-10-15 | 2013-05-01 | 三洋电机株式会社 | Power management system |
| CN201956725U (en) * | 2011-03-18 | 2011-08-31 | 广东国光电子有限公司 | Equalizing device of power iron phosphate lithium battery pack |
| CN102355031A (en) * | 2011-10-29 | 2012-02-15 | 重庆大学 | Active equalizing charging method and device for LiFePO4 power battery packs |
| CN103633384A (en) * | 2012-08-30 | 2014-03-12 | 石家庄杰泰特动力能源有限公司 | Method for continuous passive balance of operation battery cores in battery pack |
| CN103048626A (en) * | 2012-12-17 | 2013-04-17 | 惠州市亿能电子有限公司 | Method for accurately estimating SOC (State of Charge) |
| CN103683403A (en) * | 2013-12-04 | 2014-03-26 | 奇瑞汽车股份有限公司 | Method and device for balancing battery capacity of battery system and electric automobile |
| CN104505550A (en) * | 2014-12-25 | 2015-04-08 | 宁德时代新能源科技有限公司 | Passive equalizing method and system for lithium iron phosphate battery pack |
| CN104600387A (en) * | 2015-02-05 | 2015-05-06 | 青海时代新能源科技有限公司 | Active equalization method and active equalization system of lithium iron phosphate battery pack |
| CN105162206A (en) * | 2015-09-30 | 2015-12-16 | 环旭电子股份有限公司 | Rechargeable battery charging control method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995102A (en) * | 2019-03-01 | 2019-07-09 | 中国第一汽车股份有限公司 | A power battery balancing system and control method for electric vehicles |
| CN109995102B (en) * | 2019-03-01 | 2022-04-01 | 中国第一汽车股份有限公司 | Power battery equalization system for electric automobile and control method |
| CN115236536A (en) * | 2021-04-23 | 2022-10-25 | 北汽福田汽车股份有限公司 | Method for evaluating voltage consistency after lithium iron phosphate battery is installed on vehicle and vehicle |
| CN115603351A (en) * | 2022-12-13 | 2023-01-13 | 麦田能源有限公司（Cn） | Energy storage system processing method and device, processor and electronic equipment |
| CN115972976A (en) * | 2023-01-30 | 2023-04-18 | 北京新能源汽车股份有限公司 | A method and device for matching a battery system equalization scheme |
| FR3154879A1 (en) | 2023-10-30 | 2025-05-02 | Renault S.A.S | Device for balancing the charge of cells in a battery, motor vehicle and associated method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108780927B (en) | 2021-06-25 |
| WO2017139967A1 (en) | 2017-08-24 |
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