CN109991547A

CN109991547A - The maximum allowable charging and discharging currents estimation method of lithium ion battery packet and device

Info

Publication number: CN109991547A
Application number: CN201910251827.2A
Authority: CN
Inventors: 吴明; 舒星
Original assignee: Shenzhen Mammoth Electric Technology Co Ltd
Current assignee: Shenzhen Mammoth Electric Technology Co Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2019-07-09
Anticipated expiration: 2039-03-29
Also published as: CN109991547B

Abstract

The present invention is suitable for technical field of lithium ion, provide the maximum allowable charging and discharging currents estimation method of lithium ion battery packet, device and terminal device, method includes: to obtain first maximum allowable charging and discharging currents threshold value of any single battery under actual temperature in lithium ion battery packet, obtain second maximum allowable charging and discharging currents threshold value of any single battery under different remaining capacities in lithium ion battery packet, obtain the maximum allowable charging and discharging currents threshold value of third of any single battery under charge and discharge blanking voltage in lithium ion battery packet, according to preset rules to first, second and the maximum allowable charging and discharging currents threshold value of third be compared, it obtains the maximum allowable charging and discharging currents threshold value of lithium ion battery packet single battery and is calculated, obtain the maximum allowable charging and discharging currents threshold value of lithium ion battery packet, combine temperature, remaining electricity Amount and voltage limit the charging and discharging currents variation of lower battery, improve the accuracy to lithium ion battery packet charging and discharging currents threshold calculations.

Description

The maximum allowable charging and discharging currents estimation method of lithium ion battery packet and device

Technical field

The invention belongs to lithium ion battery charging technique field more particularly to a kind of maximum allowable charge and discharges of lithium ion battery packet Electric current estimation method, apparatus and terminal device.

Background technique

The peak point current of preestimating battery can assess power battery pack charge and discharge current limitation energy under different state-of-charges Relationship between power and optimal match battery group and vehicles dynamic performance, to meet acceleration and the grade climbing performance of vehicle, most The performance motor regenerating braking energy of limits recycles function；Also, predict battery peak electric current for reasonable employment battery, keep away Exempt from battery occur overcharging/over-discharge phenomenon, extend battery and have important theory significance and practical value.

Traditional peak point current estimation method usually as a whole by power battery pack leads to estimated result mistake High or too low, error is larger.

Also, conventional method hardly results in accurate estimated result only using remaining capacity as the limitation of electric current, and It will lead to partial power single battery to occur overcharging or over-discharge phenomenon, or even cause safety problem.

Summary of the invention

In view of this, the embodiment of the invention provides a kind of maximum allowable charging and discharging currents estimation sides of lithium ion battery packet Method, device and terminal device, to solve problems of the prior art.

The first aspect of the embodiment of the present invention provides a kind of maximum allowable charging and discharging currents estimation side of lithium ion battery packet Method, comprising:

The actual temperature for obtaining any single battery in lithium ion battery packet, to the actual temperature of the ion battery packet into Row calculates, and obtains first maximum allowable charging and discharging currents threshold of any single battery under actual temperature in lithium ion battery packet Value；Wherein, the lithium ion battery packet includes two and more than two series, parallel or series-parallel single battery；Maximum permits Perhaps charging and discharging currents threshold value includes maximum allowable charging current threshold value and maximum allowable discharging current threshold；

The limitation of charging highest remaining capacity, discharge minimum remaining capacity limitation, any monomer electricity to lithium ion battery packet The residual electric quantity and maximum discharge capacity in pond are calculated, and obtain in the lithium ion battery packet any single battery in difference The second maximum allowable charging and discharging currents threshold value under remaining capacity；

To end voltage, charge cutoff voltage and the discharge cut-off voltage of any single battery in the lithium ion battery packet into Row calculates, and obtains the maximum allowable charge and discharge of third of any single battery under charge and discharge blanking voltage in the lithium ion battery packet Electric current threshold；

According to preset rules to the described first maximum allowable charging and discharging currents threshold value, the second maximum allowable charging and discharging currents threshold Value and the maximum allowable charging and discharging currents threshold value of third are compared, and obtain the maximum allowable charge and discharge of lithium ion battery packet single battery Electric current threshold；

The maximum allowable charging and discharging currents threshold value of the lithium ion battery packet single battery is calculated, lithium ion is obtained The maximum allowable charging and discharging currents threshold value of battery pack.

Optionally, the actual temperature for obtaining any single battery in lithium ion battery packet, to the ion battery packet Actual temperature calculated, obtain first maximum allowable the filling under actual temperature of any single battery in lithium ion battery packet Discharging current threshold, comprising:

Obtain the maximum allowable charging and discharging currents threshold value of the lithium ion battery packet at different temperatures as defined in producer；

The maximum allowable charging and discharging currents threshold value under the different temperatures range is carried out by the first preset algorithm smooth Transition obtains the maximum allowable charging and discharging currents threshold calculations expression formula under updated different temperatures；Wherein, described first is pre- Imputation method is linear smoothing transition algorithm；

Obtain the actual temperature of all single batteries in the lithium ion battery packet；

According to the maximum allowable charging and discharging currents threshold calculations expression formula under the updated different temperatures to all lists The actual temperature of body battery is calculated, and is obtained in the lithium ion battery packet corresponding to the actual temperature of all single batteries Maximum allowable charging and discharging currents threshold value；

Obtain maximum allowable charge and discharge electricity corresponding to the actual temperature of all single batteries in the lithium ion battery packet Flow threshold value in, meet the maximum allowable charging and discharging currents threshold value of any single battery of the preset rules, as the lithium from First maximum allowable charging and discharging currents threshold value of the sub- battery pack under actual temperature range.

Optionally, maximum allowable corresponding to the actual temperature of all single batteries in the lithium ion battery packet fill is obtained In discharging current threshold, meet the maximum allowable charging and discharging currents threshold value of any single battery of the preset rules, as institute State first maximum allowable charging and discharging currents threshold value of the lithium ion battery packet under actual temperature range, comprising:

If the preset rules are that charging current direction is negative, discharge current direction is positive, then obtains the lithium-ion electric The maximum of the maximum allowable the smallest single battery of charging current threshold value corresponding to the actual temperature of all single batteries in the packet of pond Allow charging current threshold value, as the first maximum allowable charging current threshold value；

Obtain maximum allowable discharge current corresponding to the actual temperature of all single batteries in the lithium ion battery packet The maximum allowable discharging current threshold of the maximum single battery of threshold value, as the first maximum allowable discharging current threshold.

Optionally, the charging highest remaining capacity to lithium ion battery packet limits, the minimum remaining capacity that discharges limits, The residual electric quantity and maximum discharge capacity of any single battery are calculated, and any monomer in the lithium ion battery packet is obtained Second maximum allowable charging and discharging currents threshold value of the battery under different remaining capacities, comprising:

Obtain the charging highest remaining capacity limitation of the lithium ion battery packet, the minimum remaining capacity that discharges limits, is any The residual electric quantity and maximum discharge capacity of single battery；

The charging highest remaining capacity is limited according to current integration method, residual electric quantity in the lithium ion battery packet The residual electric quantity and maximum discharge capacity of maximum single battery are calculated, and the maximum monomer of the residual electric quantity is obtained Second maximum charging current threshold value of battery；

According to the current integration method to remaining electricity in the minimum remaining capacity limitation of the electric discharge, the lithium ion battery packet The residual electric quantity and maximum discharge capacity of the smallest single battery of magnitude are calculated, and it is the smallest to obtain the residual electric quantity Second maximum discharge current threshold value of single battery.

Optionally, the end voltage of any single battery, charge cutoff voltage and electric discharge in the lithium ion battery packet are cut Only voltage is calculated, and it is maximum to obtain third of any single battery under charge and discharge blanking voltage in the lithium ion battery packet Allow charging and discharging currents threshold value, comprising:

Obtain the charge cutoff voltage of the lithium ion battery packet, the end electricity of discharge cut-off voltage and any single battery Pressure；

Establish the battery single order equivalent-circuit model of lithium ion battery packet；

According to the remaining capacity and actual temperature of any single battery in the lithium ion battery packet, the lithium ion is obtained The open-circuit voltage of any single battery in battery pack；

Battery single order equivalent-circuit model based on the lithium ion battery packet according to the second preset algorithm to the lithium from The open-circuit voltage of the smallest single battery of open-circuit voltage, actual temperature and end voltage are recognized in sub- battery pack, described in acquisition The identified parameters of the smallest single battery of open-circuit voltage；Wherein, the identified parameters include ohmic internal resistance, polarization resistance and polarization Capacitor；Second preset algorithm is the Identification of parameter of the least square method with forgetting factor；

Battery single order equivalent-circuit model based on the lithium ion battery packet is according to second preset algorithm to described The open-circuit voltage of the maximum single battery of open-circuit voltage, actual temperature and end voltage are recognized in lithium ion battery packet, are obtained The identified parameters of the maximum single battery of open-circuit voltage；

To the charge cutoff voltage, discharge cut-off voltage, the identified parameters of the smallest single battery of the open-circuit voltage It is calculated, obtains the maximum allowable discharging current threshold of third of the smallest single battery of the open-circuit voltage；

To the charge cutoff voltage, discharge cut-off voltage, the identified parameters of the maximum single battery of the open-circuit voltage It is calculated, obtains the maximum allowable charging current threshold value of third of the maximum single battery of the open-circuit voltage.

Optionally, it is described according to preset rules to the described first maximum allowable charging and discharging currents threshold value, second maximum allowable Charging and discharging currents threshold value and the maximum allowable charging and discharging currents threshold value of third are compared, and obtain lithium ion battery packet single battery Maximum allowable charging and discharging currents threshold value, comprising:

If the preset rules are that charging current direction is negative, discharge current direction is positive, then it is maximum to obtain described first Allow discharging current threshold, absolute value is most in the second maximum allowable discharging current threshold and the maximum allowable discharging current threshold of third The maximum allowable discharging current threshold of small single battery is put as the maximum allowable of single battery in the lithium ion battery packet Electric current threshold；

The described first maximum allowable charging current threshold value, the second maximum allowable charging current threshold value and third maximum is obtained to permit Perhaps in charging current threshold value the smallest single battery of absolute value maximum allowable charging current threshold value, as the lithium ion battery The maximum allowable charging current threshold value of single battery in packet.

Optionally, the maximum allowable charging and discharging currents threshold value of the lithium ion battery packet single battery is calculated, is obtained Take the maximum allowable charging and discharging currents threshold value of lithium ion battery packet, comprising:

Calculate the maximum allowable charging and discharging currents threshold value of single battery and the lithium-ion electric in the lithium ion battery packet Wrap the product of single battery number in parallel, the maximum allowable charging and discharging currents threshold value as the lithium ion battery packet in pond.

The second aspect of the embodiment of the present invention provides a kind of maximum allowable charging and discharging currents estimation dress of lithium ion battery packet It sets, comprising:

First computing module, for obtaining the actual temperature of any single battery in lithium ion battery packet, to the ion The actual temperature of battery pack is calculated, and first maximum of any single battery under actual temperature in lithium ion battery packet is obtained Allow charging and discharging currents threshold value；Wherein, the lithium ion battery packet includes two and more than two series, parallel or series-parallel Single battery；Maximum allowable charging and discharging currents threshold value includes maximum allowable charging current threshold value and maximum allowable discharge current threshold Value；

Second computing module, it is electric for the charging highest remaining capacity limitation to lithium ion battery packet, minimum residue of discharging Amount limitation, the residual electric quantity of any single battery and maximum discharge capacity are calculated, and are obtained in the lithium ion battery packet Second maximum allowable charging and discharging currents threshold value of any single battery under different remaining capacities；

Third computing module, for the end voltage of any single battery, charge cutoff electricity in the lithium ion battery packet Pressure and discharge cut-off voltage are calculated, and obtain in the lithium ion battery packet any single battery under charge and discharge blanking voltage The maximum allowable charging and discharging currents threshold value of third；

Comparison module, for being permitted according to preset rules the described first maximum allowable charging and discharging currents threshold value, the second maximum Perhaps charging and discharging currents threshold value and the maximum allowable charging and discharging currents threshold value of third are compared, and obtain lithium ion battery packet single battery Maximum allowable charging and discharging currents threshold value；

Obtain module, carry out by the maximum allowable charging and discharging currents threshold value to the lithium ion battery packet single battery based on It calculates, obtains the maximum allowable charging and discharging currents threshold value of lithium ion battery packet.

The third aspect of the embodiment of the present invention provides a kind of terminal device, comprising: memory, processor and is stored in In the memory and the computer program that can run on the processor, when the processor executes the computer program It realizes such as the step of the above method.

The fourth aspect of the embodiment of the present invention provides a kind of computer readable storage medium, the computer-readable storage Media storage has computer program, realizes when the computer program is executed by processor such as the step of the above method.

What the embodiment of the present invention was limited by current threshold under the different temperatures as defined in the producer, by highest and lowest SOC Single battery in current threshold and the three direction calculating lithium ion battery packets of current threshold limited by charge and discharge blanking voltage Maximum charging and discharging currents threshold value, and the maximum charging and discharging currents threshold value obtained according to three constraint condition is compared, is counted It calculates, obtains the maximum charging and discharging currents threshold value of lithium ion battery packet.It considers remaining capacity and voltage limits lower lithium-ion electric The charging and discharging currents in pond change, while current break caused by avoiding because of temperature change, reduce temperature to calculated result It influences, improves the accuracy to lithium ion battery packet maximum charging and discharging currents threshold calculations.

Detailed description of the invention

It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these Attached drawing obtains other attached drawings.

Fig. 1 is the process for the maximum allowable charging and discharging currents estimation method of lithium ion battery packet that the embodiment of the present invention one provides Schematic diagram；

Fig. 2 is the process of the maximum allowable charging and discharging currents estimation method of lithium ion battery packet provided by Embodiment 2 of the present invention Schematic diagram；

Fig. 3 is the process for the maximum allowable charging and discharging currents estimation method of lithium ion battery packet that the embodiment of the present invention three provides Schematic diagram；

Fig. 4 is the process for the maximum allowable charging and discharging currents estimation method of lithium ion battery packet that the embodiment of the present invention four provides Schematic diagram；

Fig. 5 is the single order RC model schematic for the lithium ion battery that the embodiment of the present invention four provides；

Fig. 6 is the curve graph of the open-circuit voltage of the lithium ion battery of the offer of the embodiment of the present invention four at different temperatures；

Fig. 7 is the structure for the maximum allowable charging and discharging currents estimation device of lithium ion battery packet that the embodiment of the present invention five provides Schematic diagram；

Fig. 8 is the schematic diagram for the terminal device that the embodiment of the present invention six provides.

Specific embodiment

In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention Attached drawing, technical solution in the embodiment of the present invention are explicitly described, it is clear that described embodiment is the present invention one The embodiment divided, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing Every other embodiment obtained under the premise of creative work out, should fall within the scope of the present invention.

Description and claims of this specification and term " includes " and their any deformations in above-mentioned attached drawing, meaning Figure, which is to cover, non-exclusive includes.Such as process, method or system comprising a series of steps or units, product or equipment do not have It is defined in listed step or unit, but optionally further comprising the step of not listing or unit, or optionally also wrap Include the other step or units intrinsic for these process, methods, product or equipment.In addition, term " first ", " second " and " third " etc. is for distinguishing different objects, not for description particular order.

In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.

Embodiment one

As shown in Figure 1, the present embodiment provides a kind of maximum allowable charging and discharging currents estimation method of lithium ion battery packet, the party Method can be applied to such as battery-operated motor cycle charging unit, lithium ion battery packet intelligent charger terminal device.The present embodiment The provided maximum allowable charging and discharging currents estimation method of lithium ion battery packet, comprising:

S101, the actual temperature for obtaining any single battery in lithium ion battery packet, to the reality of the ion battery packet Temperature is calculated, and first maximum allowable charge and discharge electricity of any single battery under actual temperature in lithium ion battery packet is obtained Flow threshold value；Wherein, the lithium ion battery packet includes two and more than two series, parallel or series-parallel single battery；Most It is big that charging and discharging currents threshold value is allowed to include maximum allowable charging current threshold value and maximum allowable discharging current threshold.

In a particular application, the maximum of single battery at different temperatures in lithium ion battery packet as defined in producer is obtained Allow charging and discharging currents threshold value table, by linear smoothing transition algorithm to the single battery in lithium ion battery packet as defined in producer Maximum allowable charging and discharging currents threshold value at different temperatures is seamlessly transitted, in the lithium ion battery packet after obtaining transition The maximum allowable charging and discharging currents threshold value table of single battery at different temperatures reads any single battery in lithium ion battery packet Actual temperature, according to maximum allowable charge and discharge of the single battery in the lithium ion battery packet after above-mentioned transition under actual temperature Electric current threshold table obtains the corresponding first maximum allowable charging and discharging currents threshold value of actual temperature of single battery.

S102, the charging highest remaining capacity limitation to lithium ion battery packet, discharge minimum remaining capacity limitation, Ren Yidan The residual electric quantity and maximum discharge capacity of body battery are calculated, and are obtained any single battery in the lithium ion battery packet and are existed The second maximum allowable charging and discharging currents threshold value under different remaining capacities.

In a particular application, the charging highest remaining capacity limitation for obtaining the lithium ion battery packet, minimum residue of discharging Electricity limitation, the residual electric quantity of any single battery and maximum discharge capacity simultaneously calculate it according to current integration method, Obtain the second maximum allowable charging current threshold value and the smallest monomer of residual electric quantity of the maximum single battery of residual electric quantity The maximum allowable discharging current threshold of the second of battery.

S103, the end voltage of any single battery, charge cutoff voltage and electric discharge in the lithium ion battery packet are ended Voltage is calculated, and is obtained third maximum of any single battery under charge and discharge blanking voltage in the lithium ion battery packet and is permitted Perhaps charging and discharging currents threshold value.

In a particular application, the battery single order equivalent-circuit model of lithium ion battery packet is established, and obtains lithium ion battery The open-circuit voltage of any single battery in packet, based on the battery single order equivalent-circuit model of lithium ion battery packet according to based on minimum The Identification of parameter of square law is to the open-circuit voltage of any single battery, end voltage, charge cutoff electricity in lithium ion battery packet Pressure and discharge cut-off voltage are calculated, and it is maximum to obtain third of the smallest single battery of open-circuit voltage under discharge cut-off voltage The third maximum charging current threshold value of discharging current threshold and the maximum single battery of open-circuit voltage under charge cutoff voltage.

S104, according to preset rules to the described first maximum allowable charging and discharging currents threshold value, the second maximum allowable charge and discharge Current threshold and the maximum allowable charging and discharging currents threshold value of third are compared, and the maximum for obtaining lithium ion battery packet single battery permits Perhaps charging and discharging currents threshold value.

In a particular application, if preset rules are that charging current direction is negative, discharge current direction is positive, then obtains first In maximum allowable discharging current threshold, the second maximum allowable discharging current threshold and the maximum allowable discharging current threshold of third absolutely It is worth the maximum allowable discharging current threshold of the smallest single battery, is put as the maximum allowable of single battery in lithium ion battery packet Electric current threshold；

It obtains the first maximum allowable charging current threshold value, the second maximum allowable charging current threshold value and third is maximum allowable fills The maximum allowable charging current threshold value of the smallest single battery of absolute value in electric current threshold, as monomer in lithium ion battery packet The maximum allowable charging current threshold value of battery；That is:

Wherein, i_maxFor the first maximum discharge current threshold value,It is Three maximum discharge current threshold values,For the second maximum discharge current threshold value, i_minFor the first maximum charging current threshold value,For Third maximum charging current threshold value,For the second maximum charging current threshold value, when k indicates the charge and discharge of lithium ion battery packet Between.

It should be noted that if preset rules are that charging current direction is positive, discharge current direction is negative, then obtains first In maximum allowable discharging current threshold, the second maximum allowable discharging current threshold and the maximum allowable discharging current threshold of third absolutely It is worth the maximum allowable discharging current threshold of maximum single battery, is put as the maximum allowable of single battery in lithium ion battery packet Electric current threshold；The first maximum allowable charging current threshold value, the second maximum allowable charging current threshold value and third maximum is obtained to permit Perhaps in charging current threshold value the single battery of maximum absolute value maximum allowable charging current threshold value, as in lithium ion battery packet The maximum allowable charging current threshold value of single battery.

S105, the maximum allowable charging and discharging currents threshold value of the lithium ion battery packet single battery is calculated, is obtained The maximum allowable charging and discharging currents threshold value of lithium ion battery packet.

In a particular application, calculate lithium ion battery packet in single battery maximum allowable charging and discharging currents threshold value and lithium from The product of sub- battery pack parallel connection single battery number, the maximum allowable charging and discharging currents threshold value as lithium ion battery packet, it may be assumed that

Wherein, N_pFor monomer electricity in parallel in lithium ion battery packet The number in pond.

In one embodiment, the step S104 includes:

Current threshold under the present embodiment different temperatures as defined in the producer, the current threshold limited by highest and lowest SOC, And the maximum of single battery is filled in three direction calculating lithium ion battery packets of the current threshold limited by charge and discharge blanking voltage Discharging current threshold, and the maximum charging and discharging currents threshold value obtained according to three constraint condition is compared, is calculated, obtain lithium The maximum charging and discharging currents threshold value of ion battery packet.It considers remaining capacity and voltage limits the charge and discharge of lower lithium ion battery Curent change, while current break caused by avoiding because of temperature change, reduce influence of the temperature to calculated result, improve Accuracy to lithium ion battery packet maximum charging and discharging currents threshold calculations.

Embodiment two

As shown in Fig. 2, the present embodiment is the further explanation to the method and step in embodiment one.In the present embodiment, Step S101, comprising:

S1011, the maximum allowable charging and discharging currents of the lithium ion battery packet at different temperatures as defined in producer are obtained Threshold value.

In a particular application, the maximum of single battery at different temperatures in lithium ion battery packet as defined in producer is obtained Allow charging and discharging currents threshold value table (for example, the maximum allowable electric discharge of lithium ion battery as defined in a certain producer at different temperatures Current threshold table is as shown in table 1, the maximum allowable charging current threshold of lithium ion battery as defined in a certain producer at different temperatures It is worth table as shown in table 2, under normal circumstances, single battery in lithium ion battery packet as defined in same producer is at different temperatures Maximum allowable charging and discharging currents threshold value is identical):

Table 1:

Table 2:

S1012, by the first preset algorithm to the maximum allowable charging and discharging currents threshold value under the different temperatures range into Row smooth transition, obtains the maximum allowable charging and discharging currents threshold calculations expression formula under updated different temperatures；Wherein, described First preset algorithm is linear smoothing transition algorithm.

In a particular application, by the first preset algorithm, (in the present embodiment, the first preset algorithm is linear smoothing transition Algorithm) the maximum allowable charging and discharging currents threshold value under different temperatures range is seamlessly transitted, obtain updated not equality of temperature Maximum allowable charging and discharging currents threshold calculations expression formula under degree.In battery, (in the present embodiment, defaulting battery is lithium ion list Body battery) actual temperature when change by linear smoothing transition algorithm to maximum allowable charge and discharge as defined in producer Current threshold is seamlessly transitted, available that curent change process is made to include the slowly varying process of smooth transition.For example, In upper table 1, it is known that when temperature is higher than 5 DEG C, electric current is by I_{Dis_1}Slowly varying is I_{Dis_2}, I is reached according to electric current_{Dis_2}For end Current change rate can be calculated in the actual temperature of battery when point.Assuming that when the actual temperature of battery reaches 10 DEG C, electricity Stream rises to I_{Dis_2}, then battery maximum allowable discharge current variation in 5 DEG C to 10 DEG C sections are as follows:

Similarly, the maximum allowable charging and discharging currents of the producer such as table after the smooth transition obtained according to linear smoothing transition algorithm Shown in table 43, (in the present embodiment, set preset rules and be defined as charging current direction and be negative, discharge current direction is positive):

Maximum allowable discharging current threshold table under different temperatures as defined in producer after the smooth transition of table 3

Maximum allowable charging current threshold value table under different temperatures as defined in producer after the smooth transition of table 4

S1013, the actual temperature for obtaining all single batteries in the lithium ion battery packet.

S1014, according to the maximum allowable charging and discharging currents threshold calculations expression formula pair under the updated different temperatures The actual temperature of all single batteries is calculated, and the actual temperature institute of all single batteries in the lithium ion battery packet is obtained Corresponding maximum allowable charging and discharging currents threshold value.

In a particular application, according to the actual temperature of single batteries all in lithium ion battery packet, its actual temperature is determined Maximum allowable charging and discharging currents threshold calculations expression formula under corresponding updated different temperatures；And according to it is updated not Maximum allowable charging and discharging currents threshold calculations expression formula under synthermal calculates the actual temperature of all single batteries, obtains Take maximum allowable charging and discharging currents threshold value corresponding to the actual temperature of all single batteries in lithium ion battery packet.For example, if The actual temperature for getting a certain single battery in lithium ion battery packet is 6 DEG C, then can determine the actual temperature of the single battery Corresponding maximum allowable discharging current threshold calculation expression are as follows:Maximum allowable charging current threshold It is worth calculation expression are as follows:It is carried out according to actual temperature of above-mentioned two expression formula to the single battery It calculates, maximum allowable discharge current corresponding to the actual temperature of the single battery can be obtained.

S1015, maximum allowable corresponding to the actual temperature of all single batteries in the lithium ion battery packet fill is obtained In discharging current threshold, meet the maximum allowable charging and discharging currents threshold value of any single battery of the preset rules, as institute State first maximum allowable charging and discharging currents threshold value of the lithium ion battery packet under actual temperature range.

In a particular application, if preset rules be charging current direction be negative, discharge current direction is positive, then obtain lithium from The maximum allowable the smallest single battery of charging current threshold value corresponding to the actual temperature of all single batteries in sub- battery pack Maximum allowable charging current threshold value, the first maximum allowable charging as the maximum allowable the smallest single battery of charging current threshold value Current threshold；For example, maximum allowable charging current threshold corresponding to the actual temperature of all single batteries in lithium ion battery packet Value are as follows: { -1A, -1.5A, -2A }, then the smallest-the 2A of acquired value is the first maximum allowable charging current threshold value.

Obtain maximum allowable discharging current threshold corresponding to the actual temperature of all single batteries in lithium ion battery packet The maximum allowable discharging current threshold of maximum single battery exists as the maximum single battery of maximum allowable discharging current threshold The first maximum allowable discharging current threshold under actual temperature range.For example, in lithium ion battery packet all single batteries reality Maximum allowable discharging current threshold corresponding to the temperature of border are as follows: { 1A, 2A, 2.5A }, the maximum 2.5A of acquired value are first maximum Allow discharging current threshold.It should be noted that if preset rules regulation charging current direction is positive, discharge current direction is It is negative, then it obtains and obtains maximum allowable charging current threshold value corresponding to the actual temperature of all single batteries in lithium ion battery packet The maximum allowable charging current threshold value of maximum single battery, as the maximum allowable maximum single battery of charging current threshold value First maximum allowable charging current threshold value；Obtain maximum corresponding to the actual temperature of all single batteries in lithium ion battery packet The maximum allowable discharging current threshold for allowing the maximum single battery of discharging current threshold, as maximum allowable discharging current threshold First maximum allowable discharging current threshold of the maximum single battery under actual temperature range.

In one embodiment, the S1015, comprising:

If S10151, the preset rules are that charging current direction is negative, discharge current direction is positive, then obtains the lithium The maximum allowable the smallest single battery of charging current threshold value corresponding to the actual temperature of all single batteries in ion battery packet Maximum allowable charging current threshold value, as the first maximum allowable charging current threshold value；

S10152, maximum allowable corresponding to the actual temperature of all single batteries in the lithium ion battery packet put is obtained The maximum allowable discharging current threshold of the electric maximum single battery of current threshold, as the first maximum allowable discharging current threshold.

The present embodiment is gone forward side by side line smooth transition by obtaining as defined in producer current threshold under different temperatures, obtains lithium Maximum allowable charging and discharging currents threshold value of the ion battery packet under actual temperature range, electric current caused by avoiding because of temperature change Mutation, reduces influence of the temperature to calculated result, improves to lithium ion battery packet maximum charging and discharging currents threshold calculations Accuracy.

Embodiment three

As shown in figure 3, the present embodiment is the further explanation to the method and step in embodiment one.In the present embodiment, Step S102, comprising:

S1021, the charging highest remaining capacity limitation for obtaining the lithium ion battery packet, minimum remaining capacity limit of discharging System, the residual electric quantity of any single battery and maximum discharge capacity.

In a particular application, battery during the charging process, when close to highest SOC limits value, answer by the charging current of battery This is restricted.During discharge, when close to minimum SOC limits value, the discharge current of battery should be restricted.Cause This, the charging highest remaining capacity limitation for needing to obtain lithium ion battery packet is (availableIndicate), the minimum residue of electric discharge Electricity limitation is (availableIndicate), the residual electric quantity of all single batteries (can be indicated with SOC, in the formula of part, be It is concise to be indicated with s) and maximum discharge capacity (can be indicated with Ca).Wherein, the residual electric quantity of all single batteries can pass through peace When integration method obtain, specific formula are as follows:

Wherein, s_kFor k moment (i.e. current time) battery dump energy value, s_k-1For k-1 moment (i.e. last moment) lithium from The residual electric quantity of sub- battery, η are battery efficiency, and the value is 1 under normal circumstances；Δ t is the sampling interval, can be according to reality Border situation is specifically set, such as is set as 1s；C_nFor the nominal capacity of lithium ion battery.

S1022, the charging highest remaining capacity is limited according to current integration method, is remaining in the lithium ion battery packet The residual electric quantity and maximum discharge capacity of the maximum single battery of charge value are calculated, and it is maximum to obtain the residual electric quantity Single battery the second maximum charging current threshold value.

In a particular application, according to current integration method to remaining in the limitation of charging highest remaining capacity, lithium ion battery packet The residual electric quantity and maximum discharge capacity of the maximum single battery of charge value are calculated, and the maximum list of residual electric quantity is obtained Second maximum charging current threshold value of body battery, i.e., by formula 3, the battery calculated under charging highest remaining capacity limitation is filling Electricity continues preset time period Δ t_sMaximum charging current threshold value (wherein, the Δ t of interior permission_sIt, can be according to specific feelings for the sampling interval Condition is set, and sets Δ t under normal circumstances_sFor 1s):

S1023, the minimum remaining capacity of electric discharge is limited, in the lithium ion battery packet according to the current integration method The residual electric quantity and maximum discharge capacity of the smallest single battery of residual electric quantity are calculated, and the residual electric quantity is obtained Second maximum discharge current threshold value of the smallest single battery.

In a particular application, according to current integration method to remaining in minimum remaining capacity limitation of discharging, lithium ion battery packet The residual electric quantity and maximum discharge capacity of the smallest single battery of charge value are calculated, and the smallest list of residual electric quantity is obtained Second maximum discharge current threshold value of body battery calculates the battery to discharge under minimum remaining capacity limitation that is, by following formula 4 In discharge period section Δ t_sThe maximum discharge current threshold value of interior permission:

The present embodiment passes through the remaining capacity of current integration method step by step calculation lithium ion battery, and lithium ion battery is charging most Maximum charging and discharging currents under high remaining capacity limitation and minimum remaining capacity limitation of discharging under different remaining capacities, improve number According to accuracy.

Example IV

As shown in figure 4, the present embodiment is the further explanation to the method and step in embodiment one.In the present embodiment, Step S103, comprising:

S1031, the charge cutoff voltage for obtaining the lithium ion battery packet, discharge cut-off voltage and any single battery Hold voltage.

S1032, the battery single order equivalent-circuit model for establishing lithium ion battery packet.

In a particular application, as shown in figure 5, E is end voltage, V_OCVFor open-circuit voltage, R₀For ohmic internal resistance, R₁C₁For retouching State polarization characteristic when battery charging and discharging, polarization resistance R₁The voltage at both ends is V₁, I is charging and discharging currents.R₀、R₁、C₁For wait distinguish Know parameter (i.e. Ohmic resistance, polarization resistance and polarization capacity).According to circuit theory, τ=R is enabled₁C₁, establish lithium ion battery packet Battery single order equivalent-circuit model, then cell electrical characteristic can be described as:

It can be obtained after carrying out discretization to above formula:

S1033, according to the remaining capacity and actual temperature of any single battery in the lithium ion battery packet, described in acquisition The open-circuit voltage of any single battery in lithium ion battery packet.

In a particular application, according in the remaining capacity of single battery any in lithium ion battery packet, lithium ion battery packet The actual temperature of any single battery obtains the open-circuit voltage of any single battery in lithium ion battery packet；

Specifically, obtaining the pass of the open-circuit voltage of the lithium ion battery of different remaining capacities at different temperatures by experiment System schemes (as shown in Figure 6), and remaining capacity-temperature-open-circuit voltage relation table of lithium ion battery is established according to above-mentioned Fig. 6. Above-mentioned relation table is inquired by the remaining capacity and temperature of lithium ion battery, the open circuit electricity of lithium ion battery can be got Pressure.

In one embodiment, repeatedly test can be carried out to obtain battery (in the present embodiment, in laboratory conditions Battery is lithium ion battery) open circuit voltage curve at different temperatures.

The specific test method is as follows:

1. setting temperature is constant by battery standing in a stationary temperature tester.By battery as defined in producer Charging method is fully charged, stands after charging enough for a long time so that cell voltage reaches temperature, and battery temperature with set Determine temperature to be consistent；

2. battery is then allowed to stand 2h with the remaining capacity SOC of 1C constant-current discharge 10%；

3. repeating step 2, after the remaining capacity SOC of battery is 0,2h is stood.Battery after record is stood every time Voltage (as open-circuit voltage of the battery in the remaining capacity)；

Change the temperature of temperature measuring device, repeat the above steps 1-3, in the section that temperature is -20~60 DEG C, with every It is primary every 10 DEG C of tests, obtain the remaining capacity of battery.

It is as shown in Figure 6 to obtain the open circuit voltage curve figure of lithium ion battery at different temperatures.

S1034, the battery single order equivalent-circuit model based on the lithium ion battery packet are according to the second preset algorithm to institute It states the open-circuit voltage of the smallest single battery of open-circuit voltage in lithium ion battery packet, actual temperature and end voltage to be recognized, obtain Take the identified parameters of the smallest single battery of the open-circuit voltage；Wherein, the identified parameters include ohmic internal resistance, polarization resistance And polarization capacity；Second preset algorithm is the Identification of parameter of the least square method with forgetting factor.

In a particular application, the transmission function of the single order RC model of the Identification of parameter based on least square method are as follows:

Enable V_d(s)=E (s)-V_ocv(s), then have:

V in formula_d=V_1,k+V_2,k+I_kR_0,k==V_OCV,k-E_k；

System is transformed into the mapping of z-plane using following formula from s plane:

Δ t is sampling interval, the equation based on z-plane are as follows:

a_iFor the relevant coefficient of model parameter, above formula can be converted into discrete time-domain, it may be assumed that

V_d,k=a₁V_d,k-1+a₂I_k+a₃I_k-1(formula 11)；

That is:

E_k-V_ocv,k=a₁(E_k-1-V_ocv,k-1)+a₂I_k+a₃I_k-1(formula 12)；

So:

E_k=(1-a₁)V_ocv,k+a₁E_k-1+a₂I_k+a₃I_k-1(formula 13)；

It defines system data matrix and parameter matrix is respectively as follows:

System equation can be written as:

y_k=φ_kθ_k(formula 15)；

y_kFor system output, the least square method of recursion calculation process with forgetting factor is as follows:

Wherein, μ is forgetting factor, and K is algorithm gain, and θ is system parameter matrix, and φ is system data matrix, and P-state is estimated The error co-variance matrix of evaluation, I are unit matrix；

The ohmic internal resistance for obtaining the smallest single battery of open-circuit voltage, polarization resistance and polarization electricity can be recognized according to above formula Hold.

S1035, the battery single order equivalent-circuit model based on the lithium ion battery packet are according to second preset algorithm The open-circuit voltage of the maximum single battery of open-circuit voltage, actual temperature and end voltage in the lithium ion battery packet are distinguished Know, obtains the identified parameters of the maximum single battery of the open-circuit voltage.

In a particular application, the reason discussed based on above-mentioned S1034 step, can be according to based on the lithium ion battery packet Battery single order equivalent-circuit model is according to second preset algorithm to the maximum monomer of open-circuit voltage in lithium ion battery packet Open-circuit voltage, actual temperature and the end voltage of battery are calculated, and real-time identification goes out the Europe of the maximum single battery of open-circuit voltage Nurse internal resistance, polarization resistance and polarization capacity

S1036, the charge cutoff voltage, discharge cut-off voltage, the smallest single battery of the open-circuit voltage are distinguished Know parameter to be calculated, obtains the maximum allowable discharging current threshold of third of the smallest single battery of the open-circuit voltage.

In a particular application, formula 5 and formula 6 are converted, can get following formula 17；

Electric current i of the lithium ion battery in the duration in Δ t sampling interval_kCalculation expression:

Wherein, Δ t is the sampling interval, can be set as the case may be, Δ t is set as 1s in the present embodiment；L is third The lasting prediction duration of maximum charging and discharging currents, j refer to the data sequence number that sampled data is obtained using Δ t as the sampling interval.

According to above-mentioned formula 17 to charge cutoff voltage, discharge cut-off voltage, the ohmic internal resistance of any single battery, polarization Internal resistance and polarization capacity are calculated, and electric current i of the single-cell battery in Δ t duration can be obtained_k；

It further, can be according to following formula 18 to charge cutoff voltage, discharge cut-off voltage, the smallest list of open-circuit voltage Ohmic internal resistance, polarization resistance and the polarization capacity of body battery are calculated, and the third of the smallest single battery of open-circuit voltage is obtained Maximum allowable discharging current threshold.

The maximum allowable charging and discharging currents of third of the battery within the Δ t period estimate equation are as follows:

S1037, the charge cutoff voltage, discharge cut-off voltage, the maximum single battery of the open-circuit voltage are distinguished Know parameter to be calculated, obtains the maximum allowable charging current threshold value of third of the maximum single battery of the open-circuit voltage.

In a particular application, based on step S1036 discuss reason, according to above-mentioned formula 18 to charge cutoff voltage, put Ohmic internal resistance, polarization resistance and the polarization capacity of the maximum single battery of electric blanking voltage, open-circuit voltage are calculated, and can be obtained The maximum allowable charging current threshold value of the third of the maximum single battery of open-circuit voltage.

The present embodiment obtains the open circuit electricity of lithium ion battery by calculating battery actual temperature, end voltage in real time Pressure, and the further maximum allowable charging current threshold value of the maximum single battery of open-circuit voltage, the smallest monomer electricity of open-circuit voltage The maximum allowable discharging current threshold in pond obtains the real-time maximum charging and discharging currents that voltage limits lower lithium ion battery, guarantees The authenticity and timeliness of data.

It should be understood that the size of the serial number of each step is not meant that the order of the execution order in above-described embodiment, each process Execution sequence should be determined by its function and internal logic, the implementation process without coping with the embodiment of the present invention constitutes any limit It is fixed.

Embodiment five

As shown in fig. 7, the present embodiment provides a kind of maximum allowable charging and discharging currents estimation device 100 of lithium ion battery packet, For executing the method and step in embodiment one.The maximum allowable charging and discharging currents estimation of lithium ion battery packet provided in this embodiment Device 100, comprising:

First computing module 101, for obtaining the actual temperature of any single battery in lithium ion battery packet, to it is described from The actual temperature of sub- battery pack is calculated, obtain any single battery in lithium ion battery packet under actual temperature first most It is big to allow charging and discharging currents threshold value；Wherein, the lithium ion battery packet includes two and more than two series, parallel or series-parallel Single battery；Maximum allowable charging and discharging currents threshold value includes maximum allowable charging current threshold value and maximum allowable discharge current threshold Value；

Second computing module 102, for the charging highest remaining capacity limitation to lithium ion battery packet, minimum residue of discharging Electricity limitation, the residual electric quantity of any single battery and maximum discharge capacity are calculated, and the lithium ion battery packet is obtained In second maximum allowable charging and discharging currents threshold value of any single battery under different remaining capacities；

Third computing module 103, for end voltage, the charge cutoff to any single battery in the lithium ion battery packet Voltage and discharge cut-off voltage are calculated, and obtain in the lithium ion battery packet any single battery in charge and discharge blanking voltage Under the maximum allowable charging and discharging currents threshold value of third；

Comparison module 104 is used for according to preset rules to the described first maximum allowable charging and discharging currents threshold value, the second maximum Allow charging and discharging currents threshold value and the maximum allowable charging and discharging currents threshold value of third to be compared, obtains lithium ion battery packet monomer electricity The maximum allowable charging and discharging currents threshold value in pond；

Obtain module 105, for the maximum allowable charging and discharging currents threshold value to the lithium ion battery packet single battery into Row calculates, and obtains the maximum allowable charging and discharging currents threshold value of lithium ion battery packet.

In one embodiment, first computing module 101, comprising:

First acquisition unit 1011, for obtaining the maximum of the lithium ion battery packet at different temperatures as defined in producer Allow charging and discharging currents threshold value；

Transition element 1012, for passing through the first preset algorithm to the maximum allowable charge and discharge under the different temperatures range Current threshold is seamlessly transitted, and the maximum allowable charging and discharging currents threshold calculations expression under updated different temperatures is obtained Formula；Wherein, first preset algorithm is linear smoothing transition algorithm；

Second acquisition unit 1013, for obtaining the actual temperature of all single batteries in the lithium ion battery packet；

First computing unit 1014, for according to the maximum allowable charging and discharging currents threshold under the updated different temperatures Value calculation expression calculates the actual temperature of all single batteries, obtains all monomer electricity in the lithium ion battery packet Maximum allowable charging and discharging currents threshold value corresponding to the actual temperature in pond；

Third acquiring unit 1015, the actual temperature institute for obtaining all single batteries in the lithium ion battery packet are right In the maximum allowable charging and discharging currents threshold value answered, meet the maximum allowable charge and discharge electricity of any single battery of the preset rules Threshold value is flowed, as first maximum allowable charging and discharging currents threshold value of the lithium ion battery packet under actual temperature range.

In one embodiment, third acquiring unit 1015, comprising:

First obtains subelement 10151, if being that charging current direction is negative for the preset rules, discharge current direction It is positive, then obtains maximum allowable charging current threshold corresponding to the actual temperature of all single batteries in the lithium ion battery packet It is worth the maximum allowable charging current threshold value of the smallest single battery, as the first maximum allowable charging current threshold value；

Second obtains subelement 10152, for obtaining the actual temperature of all single batteries in the lithium ion battery packet The maximum allowable discharging current threshold of the corresponding maximum single battery of maximum allowable discharging current threshold, as the first maximum Allow discharging current threshold.

In one embodiment, second computing module 102, comprising:

4th acquiring unit 1021, the charging highest remaining capacity for obtaining the lithium ion battery packet limit, discharge Minimum remaining capacity limitation, the residual electric quantity of any single battery and maximum discharge capacity；

Second computing unit 1022 is used to limit the charging highest remaining capacity according to current integration method, the lithium The residual electric quantity of the maximum single battery of residual electric quantity and maximum discharge capacity are calculated in ion battery packet, obtain institute State the second maximum charging current threshold value of the maximum single battery of residual electric quantity；

Third computing unit 1023 is used for according to the current integration method to the minimum remaining capacity limitation of the electric discharge, institute It states the residual electric quantity of the smallest single battery of residual electric quantity and maximum discharge capacity in lithium ion battery packet to be calculated, obtain Take the second maximum discharge current threshold value of the smallest single battery of the residual electric quantity.

In one embodiment, the third computing module 103, comprising:

5th acquiring unit 1031 obtains the charge cutoff voltage of the lithium ion battery packet, discharge cut-off voltage and appoints The end voltage of one single battery；

Unit 1032 is established, for establishing the battery single order equivalent-circuit model of lithium ion battery packet；

6th acquiring unit 1033, for the remaining capacity and reality according to any single battery in the lithium ion battery packet Border temperature obtains the open-circuit voltage of any single battery in the lithium ion battery packet；

7th acquiring unit 1034, for the battery single order equivalent-circuit model based on the lithium ion battery packet according to Two preset algorithms are to the open-circuit voltage of the smallest single battery of open-circuit voltage, actual temperature and end electricity in the lithium ion battery packet Pressure is recognized, and the identified parameters of the smallest single battery of the open-circuit voltage are obtained；Wherein, the identified parameters include ohm Internal resistance, polarization resistance and polarization capacity；Second preset algorithm is that the parameter identification of the least square method with forgetting factor is calculated Method；

4th computing unit 1035, for the battery single order equivalent-circuit model based on the lithium ion battery packet according to institute State the second preset algorithm to the open-circuit voltage of the maximum single battery of open-circuit voltage in the lithium ion battery packet, actual temperature and End voltage is recognized, and the identified parameters of the maximum single battery of the open-circuit voltage are obtained；

5th computing unit 1036, for minimum to the charge cutoff voltage, discharge cut-off voltage, the open-circuit voltage The identified parameters of single battery calculated, obtain the maximum allowable electric discharge of third of the smallest single battery of the open-circuit voltage Current threshold；

6th computing unit 1037, for maximum to the charge cutoff voltage, discharge cut-off voltage, the open-circuit voltage The identified parameters of single battery calculated, obtain the maximum allowable charging of third of the maximum single battery of the open-circuit voltage Current threshold.

In one embodiment, the comparison module 104, comprising:

8th acquiring unit 1041, if being that charging current direction is negative for the preset rules, discharge current direction is Just, then it is maximum allowable that the described first maximum allowable discharging current threshold, the second maximum allowable discharging current threshold and third are obtained The maximum allowable discharging current threshold of the smallest single battery of absolute value in discharging current threshold, as the lithium ion battery packet The maximum allowable discharging current threshold of middle single battery；

9th acquiring unit 1042, for obtaining the described first maximum allowable charging current threshold value, second maximum allowable filling The maximum allowable charging current of the smallest single battery of absolute value in electric current threshold and the maximum allowable charging current threshold value of third Threshold value, the maximum allowable charging current threshold value as single battery in the lithium ion battery packet.

In one embodiment, the acquisition module 105, comprising:

7th computing unit, for calculating the maximum allowable charging and discharging currents threshold of single battery in the lithium ion battery packet It is worth the product of single battery number in parallel with the lithium ion battery packet, the maximum allowable charge and discharge as the lithium ion battery packet Electric current threshold.

The present embodiment passes through current threshold, the electric current limited by highest and lowest SOC under the different temperatures as defined in the producer Single battery is most in threshold value and the three direction calculating lithium ion battery packets of current threshold limited by charge and discharge blanking voltage Big charging and discharging currents threshold value, and the maximum charging and discharging currents threshold value obtained according to three constraint condition is compared, is calculated, it obtains Take the maximum charging and discharging currents threshold value of lithium ion battery packet.It considers remaining capacity and voltage limits filling for lower lithium ion battery Discharge current variation, while current break caused by avoiding because of temperature change, reduce influence of the temperature to calculated result, mention The high accuracy to lithium ion battery packet maximum charging and discharging currents threshold calculations.

Embodiment six

Fig. 8 is the schematic diagram of terminal device provided in this embodiment.As shown in figure 8, the terminal device 8 of the embodiment wraps It includes: processor 80, memory 81 and being stored in the computer that can be run in the memory 81 and on the processor 80 Program 82, such as the maximum allowable charging and discharging currents of lithium ion battery packet estimate program.The processor 80 executes the computer The step in the above-mentioned maximum allowable charging and discharging currents estimation method embodiment of each lithium ion battery packet is realized when program 82, such as Step S101 to S105 shown in FIG. 1.Alternatively, the processor 80 realizes above-mentioned each device when executing the computer program 82 The function of each module/unit in embodiment, such as the function of module 101 to 105 shown in Fig. 7.

Illustratively, the computer program 82 can be divided into one or more module/units, it is one or Multiple module/units are stored in the memory 81, and are executed by the processor 80, to complete the present invention.Described one A or multiple module/units can be the series of computation machine program instruction section that can complete specific function, which is used for Implementation procedure of the computer program 82 in the terminal device 8 is described.For example, the computer program 82 can be divided It is cut into the first computing module, the second computing module, third computing module, comparison module and obtains module, each module concrete function As described in embodiment five, details are not described herein.

The terminal device 8 can be the calculating such as desktop PC, notebook, palm PC and cloud server and set It is standby.The terminal device may include, but be not limited only to, processor 80, memory 81.It will be understood by those skilled in the art that Fig. 8 The only example of terminal device 8 does not constitute the restriction to terminal device 8, may include than illustrating more or fewer portions Part perhaps combines certain components or different components, such as the terminal device can also include input-output equipment, net Network access device, bus etc..

Alleged processor 80 can be central processing unit (Central Processing Unit, CPU), can also be Other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field- Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic, Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor Deng.

The memory 81 can be the internal storage unit of the terminal device 8, such as the hard disk or interior of terminal device 8 It deposits.The memory 81 is also possible to the External memory equipment of the terminal device 8, such as be equipped on the terminal device 8 Plug-in type hard disk, intelligent memory card (Smart Media Card, SMC), safe digital card (Secure Digital, SD) dodge Deposit card (Flash Card) etc..Further, the memory 81 can also both include the storage inside list of the terminal device 8 Member also includes External memory equipment.The memory 81 is for storing needed for the computer program and the terminal device Other programs and data.The memory 81 can be also used for temporarily storing the data that has exported or will export.

It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each function Can unit, module division progress for example, in practical application, can according to need and by above-mentioned function distribution by different Functional unit, module are completed, i.e., the internal structure of described device is divided into different functional unit or module, more than completing The all or part of function of description.Each functional unit in embodiment, module can integrate in one processing unit, can also To be that each unit physically exists alone, can also be integrated in one unit with two or more units, it is above-mentioned integrated Unit both can take the form of hardware realization, can also realize in the form of software functional units.In addition, each function list Member, the specific name of module are also only for convenience of distinguishing each other, the protection scope being not intended to limit this application.Above system The specific work process of middle unit, module, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.

In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment The part of load may refer to the associated description of other embodiments.

Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed The scope of the present invention.

In embodiment provided by the present invention, it should be understood that disclosed device/terminal device and method, it can be with It realizes by another way.For example, device described above/terminal device embodiment is only schematical, for example, institute The division of module or unit is stated, 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.Separately A bit, shown or discussed mutual coupling or direct-coupling or communication connection can be through some interfaces, device Or the INDIRECT COUPLING or communication connection of unit, it can be electrical property, mechanical or other forms.

The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme 's.

It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list Member both can take the form of hardware realization, can also realize in the form of software functional units.

If the integrated module/unit be realized in the form of SFU software functional unit and as independent product sale or In use, can store in a computer readable storage medium.Based on this understanding, the present invention realizes above-mentioned implementation All or part of the process in example method, can also instruct relevant hardware to complete, the meter by computer program Calculation machine program can be stored in a computer readable storage medium, the computer program when being executed by processor, it can be achieved that on The step of stating each embodiment of the method.Wherein, the computer program includes computer program code, the computer program generation Code can be source code form, object identification code form, executable file or certain intermediate forms etc..The computer-readable medium It may include: any entity or device, recording medium, USB flash disk, mobile hard disk, magnetic that can carry the computer program code Dish, CD, computer storage, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium etc..It should be noted that described The content that computer-readable medium includes can carry out increasing appropriate according to the requirement made laws in jurisdiction with patent practice Subtract, such as does not include electric carrier signal and electricity according to legislation and patent practice, computer-readable medium in certain jurisdictions Believe signal.

Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all It is included within protection scope of the present invention.

Claims

1. a kind of maximum allowable charging and discharging currents estimation method of lithium ion battery packet characterized by comprising

The actual temperature for obtaining any single battery in lithium ion battery packet, counts the actual temperature of the ion battery packet It calculates, obtains first maximum allowable charging and discharging currents threshold value of any single battery under actual temperature in lithium ion battery packet；Its In, the lithium ion battery packet includes two and more than two series, parallel or series-parallel single battery；Maximum allowable charge and discharge Electric current threshold includes maximum allowable charging current threshold value and maximum allowable discharging current threshold；

To the limitation of the charging highest remaining capacity of lithium ion battery packet, minimum remaining capacity limitation of discharging, any single battery Residual electric quantity and maximum discharge capacity are calculated, and obtain in the lithium ion battery packet any single battery in different residues The second maximum allowable charging and discharging currents threshold value under electricity；

End voltage, charge cutoff voltage and the discharge cut-off voltage of any single battery in the lithium ion battery packet are counted It calculates, obtains the maximum allowable charge and discharge electricity of third of any single battery under charge and discharge blanking voltage in the lithium ion battery packet Flow threshold value；

According to preset rules to the described first maximum allowable charging and discharging currents threshold value, the second maximum allowable charging and discharging currents threshold value and The maximum allowable charging and discharging currents threshold value of third is compared, and obtains the maximum allowable charge and discharge electricity of lithium ion battery packet single battery Flow threshold value；

The maximum allowable charging and discharging currents threshold value of the lithium ion battery packet single battery is calculated, lithium ion battery is obtained The maximum allowable charging and discharging currents threshold value of packet.

2. the maximum allowable charging and discharging currents estimation method of lithium ion battery packet as described in claim 1, which is characterized in that described The actual temperature for obtaining any single battery in lithium ion battery packet, calculates the actual temperature of the ion battery packet, Obtain first maximum allowable charging and discharging currents threshold value of any single battery under actual temperature in lithium ion battery packet, comprising:

The maximum allowable charging and discharging currents threshold value under the different temperatures range is seamlessly transitted by the first preset algorithm, Obtain the maximum allowable charging and discharging currents threshold calculations expression formula under updated different temperatures；Wherein, the described first pre- imputation Method is linear smoothing transition algorithm；

According to the maximum allowable charging and discharging currents threshold calculations expression formula under the updated different temperatures to all monomer electricity The actual temperature in pond is calculated, and maximum corresponding to the actual temperature of all single batteries in the lithium ion battery packet is obtained Allow charging and discharging currents threshold value；

Obtain maximum allowable charging and discharging currents threshold corresponding to the actual temperature of all single batteries in the lithium ion battery packet In value, meet the maximum allowable charging and discharging currents threshold value of any single battery of the preset rules, as the lithium-ion electric First maximum allowable charging and discharging currents threshold value of the Chi Bao under actual temperature range.

3. the maximum allowable charging and discharging currents estimation method of lithium ion battery packet as claimed in claim 2, which is characterized in that obtain In the lithium ion battery packet in maximum allowable charging and discharging currents threshold value corresponding to the actual temperature of all single batteries, meet The maximum allowable charging and discharging currents threshold value of any single battery of the preset rules, as the lithium ion battery packet in reality The first maximum allowable charging and discharging currents threshold value under temperature range, comprising:

If the preset rules are that charging current direction is negative, discharge current direction is positive, then obtains the lithium ion battery packet In all single batteries actual temperature corresponding to the maximum allowable the smallest single battery of charging current threshold value it is maximum allowable Charging current threshold value, as the first maximum allowable charging current threshold value；

Obtain maximum allowable discharging current threshold corresponding to the actual temperature of all single batteries in the lithium ion battery packet The maximum allowable discharging current threshold of maximum single battery, as the first maximum allowable discharging current threshold.

4. the maximum allowable charging and discharging currents estimation method of lithium ion battery packet as described in claim 1, which is characterized in that described The charging highest remaining capacity limitation of lithium ion battery packet, the minimum remaining capacity that discharges are limited, the residue of any single battery Charge value and maximum discharge capacity are calculated, and obtain in the lithium ion battery packet any single battery in different remaining capacities Under the second maximum allowable charging and discharging currents threshold value, comprising:

Obtain the charging highest remaining capacity limitation of the lithium ion battery packet, discharge minimum remaining capacity limitation, any monomer The residual electric quantity and maximum discharge capacity of battery；

The charging highest remaining capacity is limited according to current integration method, residual electric quantity is maximum in the lithium ion battery packet Single battery residual electric quantity and maximum discharge capacity calculated, obtain the maximum single battery of the residual electric quantity The second maximum charging current threshold value；

According to the current integration method to residual electric quantity in the minimum remaining capacity limitation of the electric discharge, the lithium ion battery packet The residual electric quantity and maximum discharge capacity of the smallest single battery are calculated, and the smallest monomer of the residual electric quantity is obtained Second maximum discharge current threshold value of battery.

5. the maximum allowable charging and discharging currents estimation method of lithium ion battery packet as described in claim 1, which is characterized in that described End voltage, charge cutoff voltage and the discharge cut-off voltage of any single battery in the lithium ion battery packet are calculated, Obtain the maximum allowable charging and discharging currents of third of any single battery under charge and discharge blanking voltage in the lithium ion battery packet Threshold value, comprising:

Obtain the charge cutoff voltage of the lithium ion battery packet, the end voltage of discharge cut-off voltage and any single battery；

According to the remaining capacity and actual temperature of any single battery in the lithium ion battery packet, the lithium ion battery is obtained The open-circuit voltage of any single battery in packet；

Battery single order equivalent-circuit model based on the lithium ion battery packet is according to the second preset algorithm to the lithium-ion electric The open-circuit voltage of the smallest single battery of open-circuit voltage, actual temperature and end voltage are recognized in the packet of pond, obtain the open circuit The identified parameters of the smallest single battery of voltage；Wherein, the identified parameters include ohmic internal resistance, polarization resistance and polarization electricity Hold；Second preset algorithm is the Identification of parameter of the least square method with forgetting factor；

Battery single order equivalent-circuit model based on the lithium ion battery packet according to second preset algorithm to the lithium from The open-circuit voltage of the maximum single battery of open-circuit voltage, actual temperature and end voltage are recognized in sub- battery pack, described in acquisition The identified parameters of the maximum single battery of open-circuit voltage；

The identified parameters of the charge cutoff voltage, discharge cut-off voltage, the smallest single battery of the open-circuit voltage are carried out It calculates, obtains the maximum allowable discharging current threshold of third of the smallest single battery of the open-circuit voltage；

The identified parameters of the charge cutoff voltage, discharge cut-off voltage, the maximum single battery of the open-circuit voltage are carried out It calculates, obtains the maximum allowable charging current threshold value of third of the maximum single battery of the open-circuit voltage.

6. such as the maximum allowable charging and discharging currents estimation method of lithium ion battery packet described in any one of claim 1 to 5, feature Be, it is described according to preset rules to the described first maximum allowable charging and discharging currents threshold value, the second maximum allowable charging and discharging currents Threshold value and the maximum allowable charging and discharging currents threshold value of third are compared, and obtain maximum allowable the filling of lithium ion battery packet single battery Discharging current threshold, comprising:

If the preset rules are that charging current direction is negative, discharge current direction is positive, then it is maximum allowable to obtain described first Absolute value is the smallest in discharging current threshold, the second maximum allowable discharging current threshold and the maximum allowable discharging current threshold of third The maximum allowable discharging current threshold of single battery, the maximum allowable electric discharge electricity as single battery in the lithium ion battery packet Flow threshold value；

It obtains the described first maximum allowable charging current threshold value, the second maximum allowable charging current threshold value and third is maximum allowable fills The maximum allowable charging current threshold value of the smallest single battery of absolute value in electric current threshold, as in the lithium ion battery packet The maximum allowable charging current threshold value of single battery.

7. the maximum allowable charging and discharging currents estimation method of lithium ion battery packet as described in claim 1, which is characterized in that institute The maximum allowable charging and discharging currents threshold value for stating lithium ion battery packet single battery is calculated, and the maximum of lithium ion battery packet is obtained Allow charging and discharging currents threshold value, comprising:

Calculate the maximum allowable charging and discharging currents threshold value of single battery and the lithium ion battery packet in the lithium ion battery packet The product of single battery number in parallel, the maximum allowable charging and discharging currents threshold value as the lithium ion battery packet.

8. a kind of maximum allowable charging and discharging currents estimation device of lithium ion battery packet characterized by comprising

First computing module, for obtaining the actual temperature of any single battery in lithium ion battery packet, to the ion battery The actual temperature of packet is calculated, and it is first maximum allowable under actual temperature to obtain any single battery in lithium ion battery packet Charging and discharging currents threshold value；Wherein, the lithium ion battery packet includes two and more than two series, parallel or series-parallel monomer Battery；Maximum allowable charging and discharging currents threshold value includes maximum allowable charging current threshold value and maximum allowable discharging current threshold；

Second computing module, for the charging highest remaining capacity limitation to lithium ion battery packet, minimum remaining capacity limit of discharging System, the residual electric quantity of any single battery and maximum discharge capacity are calculated, and are obtained any in the lithium ion battery packet Second maximum allowable charging and discharging currents threshold value of the single battery under different remaining capacities；

Third computing module, for the end voltage of any single battery in the lithium ion battery packet, charge cutoff voltage and Discharge cut-off voltage is calculated, and of any single battery in the lithium ion battery packet under charge and discharge blanking voltage is obtained Three maximum allowable charging and discharging currents threshold values；

Comparison module, for maximum allowable being filled according to preset rules to the described first maximum allowable charging and discharging currents threshold value, second Discharging current threshold and the maximum allowable charging and discharging currents threshold value of third are compared, and obtain lithium ion battery packet single battery most It is big to allow charging and discharging currents threshold value；

Module is obtained, is calculated for the maximum allowable charging and discharging currents threshold value to the lithium ion battery packet single battery, Obtain the maximum allowable charging and discharging currents threshold value of lithium ion battery packet.

9. a kind of terminal device, including memory, processor and storage are in the memory and can be on the processor The computer program of operation, which is characterized in that the processor realizes such as claim 1 to 7 when executing the computer program The step of any one the method.

10. a kind of computer readable storage medium, the computer-readable recording medium storage has computer program, and feature exists In when the computer program is executed by processor the step of any one of such as claim 1 to 7 of realization the method.