CN104569836A - Method and device for measuring heat generation power of batteries in condition of variable current - Google Patents
Method and device for measuring heat generation power of batteries in condition of variable current Download PDFInfo
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Abstract
Embodiments of the invention provide a method and device for measuring heat generation power of batteries in condition of variable current. The method comprises the following steps: measuring charging and/or discharging temperature rise data of a battery at different rates, and calculating charging and/or discharging heat generation powers of the battery at different rate according to the charging and/or discharging temperature rise data; generating a relation between the charging and/or discharging heat generation powers of the battery and the current values through curve fitting according to the current values corresponding to the charging and/or discharging heat generation powers at different rates. According to the embodiment of the invention, the relation among the heat generation powers as well as the current and time in condition of variable working current of the battery can be obtained by simply testing the temperature rise data of the battery at a fixed rate and then performing theoretical calculation according to the test result; the test equipment is simple, convenient to implement, and low in cost; a solution for effectively measuring the heat generation power of the battery in the process of charging and discharging in condition of variable current is provided.
Description
Technical field
The present invention relates to power battery technology field, particularly relate to a kind of method and apparatus measuring the heat-dissipating power of battery under time-dependent current operating mode.
Background technology
Along with new forms of energy industry requires more and more higher to the performance of lithium battery group and cycle life, the thermal management scheme of lithium battery group is subject to increasing attention, and thermal management scheme needs to design according to the thermal value of ion battery.The thermal value majority of current lithium battery is described with temperature rise curve, and what this method obtained is temperature gap, can not obtain concrete heat-dissipating power and thermal.
At present, prior art is generally tested by the thermal value of accelerating calorimeter to lithium battery, but testing apparatus and somewhat expensive, most enterprise does not possess corresponding financial resources.And what in most cases test obtained is lithium battery at the temperature rise curve of constant-current charge or electric discharge, and the operating mode that this electric current changed under actual working state with lithium battery, discharge and recharge hocket does not conform to.
Therefore, developing a kind of scheme effectively measuring the heat-dissipating power of battery under time-dependent current operating mode is a problem demanding prompt solution.
Summary of the invention
The embodiment provides a kind of method and apparatus measuring the heat-dissipating power of battery under time-dependent current operating mode, to realize effectively measuring the heat-dissipating power of battery under time-dependent current operating mode.
According to an aspect of the present invention, provide a kind of method measuring the heat-dissipating power of battery under time-dependent current operating mode, comprising:
Measure the charging of battery under different multiplying and/or the temperature rise data of electric discharge, calculate according to the temperature rise data of described charging and/or electric discharge the heat-dissipating power that described battery charges and/or discharge under different multiplying;
The current value corresponding according to the heat-dissipating power of charging and/or electric discharge under described different multiplying, generates the charging of described battery and/or the relational expression between the heat-dissipating power of electric discharge and current value by curve.
Preferably, the charging of described measurement battery under different multiplying and/or the temperature rise data of electric discharge, calculate according to the temperature rise data of described charging and/or electric discharge the heat-dissipating power that described battery charges and/or discharge under different multiplying, comprising:
Measure the charging of battery under physical environment under different multiplying and/or the temperature rise data of electric discharge;
If the discharge time that described battery is discharged to cut-off voltage under discharge-rate V is t
v, then the average heat-dissipating power P of battery under this electric discharge operating mode
vbe calculated as follows formula:
If the discharge time that described battery charges to cut-off voltage under rate of charge U is t
u, then the average heat-dissipating power P of battery under this charging operating mode
ube calculated as follows formula:
Wherein, Q
conbattery outside surface and natural convection air heat exchange amount Q
surf, upper surface and natural convection air heat exchange amount Q
upsum, Q
radbattery surface Radiant exothermicity to external world, Q
stoit is the heat that battery self stores;
Calculate the average heat-dissipating power of described battery under different discharge-rate and/or rate of charge.
Preferably, the described current value corresponding according to the heat-dissipating power of charging and/or electric discharge under described different multiplying, generates the charging of described battery and/or the relational expression between the heat-dissipating power of electric discharge and current value by curve, comprising:
According to the temperature rise data of described battery under different rate of charge, obtain the current value that each average heat-dissipating power under different rate of charge is corresponding, using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding rate of charge and current value corresponding to average heat-dissipating power, generate the relational expression of described battery under charging operating mode between heat-dissipating power and charging current value according to described multiple point by curve;
And/or,
According to the temperature rise data of described battery under different discharge-rate, obtain the current value that each average heat-dissipating power under different discharge-rate is corresponding, using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding discharge-rate and current value corresponding to average heat-dissipating power, generate the relational expression of described battery under electric discharge operating mode between heat-dissipating power and discharge current value according to described multiple point by curve fitting algorithm.
Preferably, described method also comprises:
The discharge time point corresponding according to the actual discharge current value of described battery under actual discharge operating mode, and the relational expression of described battery under electric discharge operating mode between heat-dissipating power and discharge current value, obtain described battery heat-dissipating power and the relational expression between discharge time under described actual discharge operating mode;
And/or,
The duration of charging point corresponding according to the actual charge current value of described battery under reality charging operating mode, and the relational expression of described battery under charging operating mode between heat-dissipating power and charging current value, obtain described battery heat-dissipating power and the relational expression between the duration of charging under described reality charging operating mode.
Preferably, described method also comprises:
By the actual discharge electric current of described battery under actual discharge operating mode, substitute into the relational expression of described battery heat-dissipating power and discharge current value under electric discharge operating mode, calculate the heat-dissipating power that actual discharge electric current under described actual discharge operating mode is corresponding;
And/or,
By the actual charge current of described battery under reality charging operating mode, substitute into the relation curve of described battery heat-dissipating power and discharge current value under charging operating mode, calculate the heat-dissipating power that actual charge current under described actual operating mode of charging is corresponding.
According to another aspect of the present invention, a kind of device measuring the heat-dissipating power of battery under time-dependent current operating mode, comprising:
Different multiplying temperature rise data measurement module, for measuring the charging of battery under different multiplying and/or the temperature rise data of electric discharge;
Different multiplying heat-dissipating power computation module, the temperature rise data for obtaining according to described different multiplying temperature rise data measurement module calculate the heat-dissipating power that described battery charges and/or discharges under different multiplying;
Heat-dissipating power and current value relational expression acquisition module, for the current value that the heat-dissipating power of charging and/or electric discharge under the different multiplying that obtains according to described different multiplying heat-dissipating power computation module is corresponding, generate the charging of described battery and/or the relational expression between the heat-dissipating power of electric discharge and current value by curve.
Preferably, described different multiplying temperature rise data measurement module, for measuring the charging of battery under different multiplying under physical environment and/or the temperature rise data of electric discharge;
Described different multiplying heat-dissipating power computation module, is discharged to the discharge time of cut-off voltage as t for setting described battery under discharge-rate V
v, then the average heat-dissipating power P of battery under this electric discharge operating mode
vbe calculated as follows formula:
If the discharge time that described battery charges to cut-off voltage under rate of charge U is t
u, then the average heat-dissipating power P of battery under this charging operating mode
ube calculated as follows formula:
Wherein, Q
conbattery outside surface and natural convection air heat exchange amount Q
surf, upper surface and natural convection air heat exchange amount Q
upsum, Q
radbattery surface Radiant exothermicity to external world, Q
stoit is the heat that battery self stores;
Calculate the average heat-dissipating power of described battery under different discharge-rate and/or rate of charge.
Preferably, described heat-dissipating power and current value relational expression acquisition module, for according to the temperature rise data of described battery under different rate of charge, obtain the current value that each average heat-dissipating power under different rate of charge is corresponding, using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding rate of charge and current value corresponding to average heat-dissipating power, the relational expression of described battery under charging operating mode between heat-dissipating power and charging current value is generated by curve according to described multiple point,
And/or,
According to the temperature rise data of described battery under different discharge-rate, obtain the current value that each average heat-dissipating power under different discharge-rate is corresponding, using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding discharge-rate and current value corresponding to average heat-dissipating power, generate the relational expression of described battery under electric discharge operating mode between heat-dissipating power and discharge current value according to described multiple point by curve fitting algorithm.
Preferably, described device also comprises:
Heat-dissipating power and time history form acquisition module, for the discharge time point corresponding according to the actual discharge current value of described battery under actual discharge operating mode, and the relational expression of described battery under electric discharge operating mode between heat-dissipating power and discharge current value, obtain described battery heat-dissipating power and the relational expression between discharge time under described actual discharge operating mode;
And/or,
The duration of charging point corresponding according to the actual charge current value of described battery under reality charging operating mode, and the relational expression of described battery under charging operating mode between heat-dissipating power and charging current value, obtain described battery heat-dissipating power and the relational expression between the duration of charging under described reality charging operating mode.
Preferably, described device also comprises:
Actual condition heat-dissipating power computation module, for by the actual discharge electric current of described battery under actual discharge operating mode, substitute into the relational expression of described battery heat-dissipating power and discharge current value under electric discharge operating mode, calculate the heat-dissipating power that actual discharge electric current under described actual discharge operating mode is corresponding;
And/or,
By the actual charge current of described battery under reality charging operating mode, substitute into the relation curve of described battery heat-dissipating power and discharge current value under charging operating mode, calculate the heat-dissipating power that actual charge current under described actual operating mode of charging is corresponding.
The technical scheme provided as can be seen from the embodiment of the invention described above, the embodiment of the present invention is by measuring the temperature rise data of battery under different multiplying, and the heat-dissipating power under calculating different multiplying, and then obtain the relational expression between heat-dissipating power and current value.Achieve and only need to carry out the temperature rise data test of simple battery under fixed multiplying power, carry out theory calculate according to test result and just can obtain battery under the working current operating mode of change, heat-dissipating power and the relational expression between electric current and time, testing apparatus is simple, be convenient to implement, cost is low, provides a kind of scheme effectively measuring the heat-dissipating power of battery in charging under time-dependent current operating mode, discharge process.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of processing flow chart measuring the method for the heat-dissipating power of battery under time-dependent current operating mode that Fig. 1 provides for the embodiment of the present invention one;
The contour structures schematic diagram of a kind of lithium battery that Fig. 2 provides for the embodiment of the present invention one;
A kind of electric current of certain lithium battery monomer under actual condition schematic diagram over time that Fig. 3 provides for the embodiment of the present invention two;
Fig. 4 is a kind of heat-dissipating power P that the embodiment of the present invention two provides relation curve schematic diagram corresponding with the relational expression between discharge current I;
The heat-dissipating power curve synoptic diagram over time of a kind of certain lithium battery monomer finally calculated that Fig. 5 embodiment of the present invention two provides;
A kind of specific implementation structure measuring the device of the heat-dissipating power of battery under time-dependent current operating mode that Fig. 6 provides for the embodiment of the present invention three, wherein, different multiplying temperature rise data measurement module 61, different multiplying heat-dissipating power computation module 62, heat-dissipating power and current value relational expression acquisition module 63, heat-dissipating power and time history form acquisition module 64, actual condition heat-dissipating power computation module 65.
Embodiment
For ease of the understanding to the embodiment of the present invention, be further explained explanation below in conjunction with accompanying drawing for several specific embodiment, and each embodiment does not form the restriction to the embodiment of the present invention.
Embodiment one
In order to difficulties such as the deficiency and testing cost that overcome the electrokinetic cell thermal value computing method such as current lithium battery are expensive, the embodiment of the present invention proposes a kind of battery under the working current operating mode of constantly change, and heat-dissipating power is with the computing method of the change of measuring current, time.
Above-mentioned electrokinetic cell can be the electrokinetic cells such as lithium battery, lead-acid accumulator and cadmium-nickel storage cell, for lithium battery, the embodiment of the present invention is described below.
This embodiment offers a kind for the treatment of scheme measuring the method for the heat-dissipating power of battery under time-dependent current operating mode as shown in Figure 1, comprise following treatment step:
Step S110, the measurement charging of lithium battery under different multiplying and/or the temperature rise data of electric discharge.
Discharge-rate refers to that the current value required for its rated capacity released by battery in official hour, rate of charge refers to that battery is filled with the current value required for its rated capacity in official hour, discharge-rate and rate of charge equal the multiple of battery rated capacity on data value, usually represent with letter C.Nominal rating capacity as battery is 600mAh is 1C (1 multiplying power), 300mAh be then 0.5C, 6A (600mAh) for 10C. by that analogy.
First the embodiment of the present invention measures lithium battery under large space natural convection environment, difference is filled, temperature rise data under discharge-rate, the contour structures schematic diagram of a kind of lithium battery that the embodiment of the present invention one provides as shown in Figure 2, in test process, computational accuracy is reduced in order to prevent the heat of lithium battery electric core from conducting from battery core to experiment table, heat-barrier material will be used between lithium battery lower surface and experiment table to isolate, fill, discharge-rate needs according to lithium battery filling under actual condition, discharge current is formulated, lithium battery filling under actual condition, discharge current needs minimumly and maximum to fill tested, between discharge-rate.
Corresponding relation between a kind of charge and discharge multiplying power that the embodiment of the present invention provides and temperature rise data as described in Table 1, the charge and discharge multiplying power of test is not limited to the multiplying power in table, in the range of current covering lithium battery actual condition, choose many charge and discharge multiplying power tests as much as possible:
Step S120, to calculate the heat-dissipating power that described lithium battery charges and/or discharge under different multiplying according to the temperature rise data of described charging and/or electric discharge.
If the discharge time that described lithium battery is discharged to cut-off voltage under discharge-rate V is t
v, then the average heat-dissipating power P of lithium battery under this electric discharge operating mode
vbe calculated as follows formula:
formula 1
If the discharge time that described lithium battery charges to cut-off voltage under rate of charge U is t
u, then the average heat-dissipating power P of lithium battery under this charging operating mode
ube calculated as follows formula:
formula 2
Wherein, Q
conlithium battery outside surface and natural convection air heat exchange amount Q
surf, upper surface and natural convection air heat exchange amount Q
upsum,
Wherein, h
surfthe NATURAL CONVECTION COEFFICIENT OF HEAT of lithium battery outside surface to air, h
upbe the NATURAL CONVECTION COEFFICIENT OF HEAT of lithium battery upper surface to air, t is the battery testing time, A
surf, A
upthe area of lithium battery outside surface, upper surface respectively, T
wthe temperature on lithium battery surface, T
∞it is environment temperature.
Q
radlithium battery surface Radiant exothermicity to external world, Q
radcomputing formula as follows:
formula 4
Wherein, A
alwaysbe the total area on lithium battery surface, ε is the radiance of battery container, and σ is this formula fence-Boltzmann (Stefan-Boltzmann) constant.
Q
stothe heat that lithium battery self stores, Q
stocomputing formula as follows:
Q
sto=CpM Δ T=CpM (T
w-T
∞) formula 5
Wherein Cp is the specific heat capacity of lithium battery, and M is the quality of lithium battery.
According to above-mentioned formula 1-5, the average heat-dissipating power of described lithium battery under different discharge-rate and/or rate of charge can be calculated.
For 0.1C electric discharge, the average heat-dissipating power calculation algorithms under fixing charge and discharge multiplying power is described.Suppose that the discharge time that lithium battery 0.1C is discharged to cut-off voltage is t
0.1, the so average heat-dissipating power P of lithium battery under this electric discharge operating mode
0.1be calculated as follows formula:
Repeat above-mentioned processing procedure, utilize above-mentioned formula 1 and 2, the average heat-dissipating power P of lithium battery under different discharge-rate can be calculated
0.2, P
0.5, P
1..., the average heat-dissipating power P under different rate of charge
-0.1, P
-0.2, P
-0.5, P
-1,
Step S130, the current value corresponding according to the heat-dissipating power of charging and/or electric discharge under described different multiplying, generate the charging of described lithium battery and/or the relation curve between the heat-dissipating power of electric discharge and current value by curve.
According to the temperature rise data of described lithium battery under different rate of charge, obtain the current value that each average heat-dissipating power under different rate of charge is corresponding.Using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding rate of charge and current value corresponding to average heat-dissipating power, generate the relational expression of described lithium battery under charging operating mode between heat-dissipating power and charging current value according to described multiple point by curve, relation curve corresponding in coordinate system can be drawn out according to this relational expression;
And/or,
According to the temperature rise data of described lithium battery under different discharge-rate, obtain the current value that each average heat-dissipating power under different discharge-rate is corresponding.Using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding discharge-rate and current value corresponding to average heat-dissipating power, generate the relational expression of described lithium battery under electric discharge operating mode between heat-dissipating power and discharge current value according to described multiple point by curve fitting algorithm, relation curve corresponding in coordinate system can be drawn out according to this relational expression.
Above-mentioned curve fitting algorithm can comprise linear algorithm, multinomial algorithm, power function algorithm, exponential function algorithm or logarithmic function algorithm.But be not limited to this several function, as long as the mathematical form of energy correction birth thermal power and current relationship can.
Such as, the relational expression of lithium battery under charging operating mode between heat-dissipating power and charging current value can be expressed as:
P
cha＝f
cha(I)；
Relational expression under electric discharge operating mode between heat-dissipating power and charging current value can be expressed as::
P
dis＝f
dis(I)
In actual applications, the discharge time point corresponding according to the actual discharge current value of described lithium battery under actual discharge operating mode, and the relational expression of described lithium battery under electric discharge operating mode between heat-dissipating power and discharge current value, described lithium battery heat-dissipating power and the relational expression between discharge time under described actual discharge operating mode can be obtained;
And/or,
The duration of charging point corresponding according to the actual charge current value of described lithium battery under reality charging operating mode, and the relational expression of described lithium battery under charging operating mode between heat-dissipating power and charging current value, described lithium battery heat-dissipating power and the relational expression between the duration of charging under described reality charging operating mode can be obtained.
Step S140, by the actual discharge electric current of described lithium battery under actual discharge operating mode, substitute into the relational expression of described lithium battery heat-dissipating power and discharge current value under electric discharge operating mode, the heat-dissipating power that actual discharge electric current under described actual discharge operating mode is corresponding can be calculated;
And/or,
By the actual charge current of described lithium battery under reality charging operating mode, substitute into the relation curve of described lithium battery heat-dissipating power and discharge current value under charging operating mode, the heat-dissipating power that actual charge current under described actual operating mode of charging is corresponding can be calculated.
Embodiment two
Schematic diagram is as shown in Figure 3 over time for the electric current of certain lithium battery monomer a kind of under actual condition that this embodiment provides, calculate the heat-dissipating power of certain lithium battery above-mentioned at actual condition with the change of electric current, first can measure the electric discharge temperature rise data under the different multiplying of this lithium battery, measurement result as described in Table 1:
Table 1
| time(s) | 0.5C | 1C | 2C |
| 120 | 26.87 | 26.17 | 26.23 |
| 240 | 26.90 | 26.17 | 26.27 |
| 360 | 26.97 | 26.30 | 28.43 |
| 480 | 27.03 | 27.03 | 31.83 |
| 600 | 27.17 | 27.77 | 34.67 |
| 900 | 27.50 | 29.33 | 39.43 |
| 1200 | 27.83 | 30.23 | 42.60 |
| 1500 | 28.07 | 30.80 | 44.90 |
| 1800 | 28.20 | 31.40 | 45.67 |
| 2100 | 28.30 | 31.90 | 47.73 |
| 2400 | 28.40 | 32.17 | |
| 2700 | 28.47 | 32.47 | |
| 3000 | 28.53 | 32.90 | |
| 3300 | 28.47 | 33.40 | |
| 3600 | 28.43 | 34.03 | |
| 3900 | 28.33 | 35.00 | |
| 4200 | 28.30 | ||
| 4500 | 28.33 | ||
| 4800 | 28.27 | ||
| 5100 | 28.30 | ||
| 5400 | 28.37 | ||
| 5700 | 28.40 | ||
| 6000 | 28.50 | ||
| 6300 | 28.57 | ||
| 6600 | 28.77 |
| 6900 | 29.03 | ||
| 7200 | 29.43 |
Utilize the data in above-mentioned table 1, as shown in table 2 below according to the heat-dissipating power that the computing method in above-described embodiment one calculate under different multiplying:
Table 2
Utilize the data in above-mentioned table 2, the relational expression that can be obtained between the heat-dissipating power P of this lithium battery and discharge current I by curve is as follows:
P＝0.0232I
2+0.0421I+0.0032
The above-mentioned heat-dissipating power P relation curve corresponding with the relational expression between discharge current I as described in Figure 4.The electric current of this operating mode different time points in Fig. 3 is substituted into above-mentioned relation formula, and curve synoptic diagram is as shown in Figure 5 over time for the heat-dissipating power of certain lithium battery monomer that can finally be calculated.
Embodiment three
This embodiment offers a kind of device measuring the heat-dissipating power of battery under time-dependent current operating mode, its specific implementation structure as shown in Figure 6, specifically can comprise following module:
Different multiplying temperature rise data measurement module 61, for measuring the charging of battery under different multiplying and/or the temperature rise data of electric discharge;
Different multiplying heat-dissipating power computation module 62, the temperature rise data for obtaining according to described different multiplying temperature rise data measurement module calculate the heat-dissipating power that described battery charges and/or discharges under different multiplying;
Heat-dissipating power and current value relational expression acquisition module 63, for the current value that the heat-dissipating power of charging and/or electric discharge under the different multiplying that obtains according to described different multiplying heat-dissipating power computation module is corresponding, generate the charging of described battery and/or the relational expression between the heat-dissipating power of electric discharge and current value by curve.
Preferably, described different multiplying temperature rise data measurement module 62, for measuring the charging of battery under different multiplying under physical environment and/or the temperature rise data of electric discharge;
Described different multiplying heat-dissipating power computation module, is discharged to the discharge time of cut-off voltage as t for setting described battery under discharge-rate V
v, then the average heat-dissipating power P of battery under this electric discharge operating mode
vbe calculated as follows formula:
If the discharge time that described battery charges to cut-off voltage under rate of charge U is t
u, then the average heat-dissipating power P of battery under this charging operating mode
ube calculated as follows formula:
Wherein, Q
conbattery outside surface and natural convection air heat exchange amount Q
surf, upper surface and natural convection air heat exchange amount Q
upsum, Q
radbattery surface Radiant exothermicity to external world, Q
stoit is the heat that battery self stores;
Calculate the average heat-dissipating power of described battery under different discharge-rate and/or rate of charge.
Preferably, described heat-dissipating power and current value relational expression acquisition module 33, for according to the temperature rise data of described battery under different rate of charge, obtain the current value that each average heat-dissipating power under different rate of charge is corresponding, using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding rate of charge and current value corresponding to average heat-dissipating power, the relational expression of described battery under charging operating mode between heat-dissipating power and charging current value is generated by curve according to described multiple point,
And/or,
According to the temperature rise data of described battery under different discharge-rate, obtain the current value that each average heat-dissipating power under different discharge-rate is corresponding, using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding discharge-rate and current value corresponding to average heat-dissipating power, generate the relational expression of described battery under electric discharge operating mode between heat-dissipating power and discharge current value according to described multiple point by curve fitting algorithm.
Further, described device also comprises:
Heat-dissipating power and time history form acquisition module 64, for the discharge time point corresponding according to the actual discharge current value of described battery under actual discharge operating mode, and the relational expression of described battery under electric discharge operating mode between heat-dissipating power and discharge current value, obtain described battery heat-dissipating power and the relational expression between discharge time under described actual discharge operating mode;
And/or,
The duration of charging point corresponding according to the actual charge current value of described battery under reality charging operating mode, and the relational expression of described battery under charging operating mode between heat-dissipating power and charging current value, obtain described battery heat-dissipating power and the relational expression between the duration of charging under described reality charging operating mode.
Actual condition heat-dissipating power computation module 65, for by the actual discharge electric current of described battery under actual discharge operating mode, substitute into the relational expression of described battery heat-dissipating power and discharge current value under electric discharge operating mode, calculate the heat-dissipating power that actual discharge electric current under described actual discharge operating mode is corresponding;
And/or,
By the actual charge current of described battery under reality charging operating mode, substitute into the relation curve of described battery heat-dissipating power and discharge current value under charging operating mode, calculate the heat-dissipating power that actual charge current under described actual operating mode of charging is corresponding.
Detailed process and the preceding method embodiment of carrying out measuring the heat-dissipating power of battery under time-dependent current operating mode with the device of the embodiment of the present invention are similar, repeat no more herein.
In sum, the embodiment of the present invention is by measuring the temperature rise data of battery under different multiplying, and the heat-dissipating power under calculating different multiplying, and then obtain the relational expression between heat-dissipating power and current value.Achieve and only need to carry out the temperature rise data test of simple battery under fixed multiplying power, carry out theory calculate according to test result and just can obtain battery under the working current operating mode of change, heat-dissipating power and the relational expression between electric current and time, testing apparatus is simple, be convenient to implement, cost is low, provides a kind of scheme effectively measuring the heat-dissipating power of battery in charging under time-dependent current operating mode, discharge process.
Heat-dissipating power and the relational expression between electric current and time can be converted to relation curve by the embodiment of the present invention, and relation curve is shown in a coordinate system visually, can be that user to understand under time-dependent current operating mode the heat-dissipating power of battery and the variation relation between electric current and time in charging, discharge process better.
The method and apparatus of the embodiment of the present invention goes for the various electrokinetic cells such as lithium battery.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required general hardware platform by software and realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for device or system embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Apparatus and system embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. measure a method for the heat-dissipating power of battery under time-dependent current operating mode, it is characterized in that, comprising:
Measure the charging of battery under different multiplying and/or the temperature rise data of electric discharge, calculate according to the temperature rise data of described charging and/or electric discharge the heat-dissipating power that described battery charges and/or discharge under different multiplying;
The current value corresponding according to the heat-dissipating power of charging and/or electric discharge under described different multiplying, generates the charging of described battery and/or the relational expression between the heat-dissipating power of electric discharge and current value by curve.
2. the method for the heat-dissipating power of battery under measurement time-dependent current operating mode according to claim 1, it is characterized in that, the charging of described measurement battery under different multiplying and/or the temperature rise data of electric discharge, calculate according to the temperature rise data of described charging and/or electric discharge the heat-dissipating power that described battery charges and/or discharge under different multiplying, comprising:
Measure the charging of battery under physical environment under different multiplying and/or the temperature rise data of electric discharge;
If the discharge time that described battery is discharged to cut-off voltage under discharge-rate V is t
v, then the average heat-dissipating power P of battery under this electric discharge operating mode
vbe calculated as follows formula:
If the discharge time that described battery charges to cut-off voltage under rate of charge U is t
u, then the average heat-dissipating power P of battery under this charging operating mode
ube calculated as follows formula:
Wherein, Q
conbattery outside surface and natural convection air heat exchange amount Q
surf, upper surface and natural convection air heat exchange amount Q
upsum, Q
radbattery surface Radiant exothermicity to external world, Q
stoit is the heat that battery self stores;
Calculate the average heat-dissipating power of described battery under different discharge-rate and/or rate of charge.
3. the method for the heat-dissipating power of battery under measurement time-dependent current operating mode according to claim 1, it is characterized in that, the described current value corresponding according to the heat-dissipating power of charging and/or electric discharge under described different multiplying, generate the charging of described battery and/or the relational expression between the heat-dissipating power of electric discharge and current value by curve, comprising:
According to the temperature rise data of described battery under different rate of charge, obtain the current value that each average heat-dissipating power under different rate of charge is corresponding, using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding rate of charge and current value corresponding to average heat-dissipating power, generate the relational expression of described battery under charging operating mode between heat-dissipating power and charging current value according to described multiple point by curve;
And/or,
According to the temperature rise data of described battery under different discharge-rate, obtain the current value that each average heat-dissipating power under different discharge-rate is corresponding, using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding discharge-rate and current value corresponding to average heat-dissipating power, generate the relational expression of described battery under electric discharge operating mode between heat-dissipating power and discharge current value according to described multiple point by curve fitting algorithm.
4. the method for the heat-dissipating power of battery under measurement time-dependent current operating mode according to claim 3, it is characterized in that, described method also comprises:
The discharge time point corresponding according to the actual discharge current value of described battery under actual discharge operating mode, and the relational expression of described battery under electric discharge operating mode between heat-dissipating power and discharge current value, obtain described battery heat-dissipating power and the relational expression between discharge time under described actual discharge operating mode;
And/or,
The duration of charging point corresponding according to the actual charge current value of described battery under reality charging operating mode, and the relational expression of described battery under charging operating mode between heat-dissipating power and charging current value, obtain described battery heat-dissipating power and the relational expression between the duration of charging under described reality charging operating mode.
5. the method for the heat-dissipating power of battery under the measurement time-dependent current operating mode according to any one of Claims 1-4, it is characterized in that, described method also comprises:
By the actual discharge electric current of described battery under actual discharge operating mode, substitute into the relational expression of described battery heat-dissipating power and discharge current value under electric discharge operating mode, calculate the heat-dissipating power that actual discharge electric current under described actual discharge operating mode is corresponding;
And/or,
By the actual charge current of described battery under reality charging operating mode, substitute into the relation curve of described battery heat-dissipating power and discharge current value under charging operating mode, calculate the heat-dissipating power that actual charge current under described actual operating mode of charging is corresponding.
6. measure a device for the heat-dissipating power of battery under time-dependent current operating mode, it is characterized in that, comprising:
Different multiplying temperature rise data measurement module, for measuring the charging of battery under different multiplying and/or the temperature rise data of electric discharge;
Different multiplying heat-dissipating power computation module, the temperature rise data for obtaining according to described different multiplying temperature rise data measurement module calculate the heat-dissipating power that described battery charges and/or discharges under different multiplying;
Heat-dissipating power and current value relational expression acquisition module, for the current value that the heat-dissipating power of charging and/or electric discharge under the different multiplying that obtains according to described different multiplying heat-dissipating power computation module is corresponding, generate the charging of described battery and/or the relational expression between the heat-dissipating power of electric discharge and current value by curve.
7. the device of the heat-dissipating power of battery under measurement time-dependent current operating mode according to claim 6, is characterized in that:
Described different multiplying temperature rise data measurement module, for measuring the charging of battery under different multiplying under physical environment and/or the temperature rise data of electric discharge;
Described different multiplying heat-dissipating power computation module, is discharged to the discharge time of cut-off voltage as t for setting described battery under discharge-rate V
v, then the average heat-dissipating power P of battery under this electric discharge operating mode
vbe calculated as follows formula:
If the discharge time that described battery charges to cut-off voltage under rate of charge U is t
u, then the average heat-dissipating power P of battery under this charging operating mode
ube calculated as follows formula:
Wherein, Q
conbattery outside surface and natural convection air heat exchange amount Q
surf, upper surface and natural convection air heat exchange amount Q
upsum, Q
radbattery surface Radiant exothermicity to external world, Q
stoit is the heat that battery self stores;
Calculate the average heat-dissipating power of described battery under different discharge-rate and/or rate of charge.
8. the device of the heat-dissipating power of battery under measurement time-dependent current operating mode according to claim 7, is characterized in that:
Described heat-dissipating power and current value relational expression acquisition module, for according to the temperature rise data of described battery under different rate of charge, obtain the current value that each average heat-dissipating power under different rate of charge is corresponding, using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding rate of charge and current value corresponding to average heat-dissipating power, the relational expression of described battery under charging operating mode between heat-dissipating power and charging current value is generated by curve according to described multiple point,
And/or,
According to the temperature rise data of described battery under different discharge-rate, obtain the current value that each average heat-dissipating power under different discharge-rate is corresponding, using heat-dissipating power as ordinate, using current value as horizontal ordinate, multiple point is marked in the coordinate system that described ordinate and horizontal ordinate are formed, average heat-dissipating power under each respectively corresponding discharge-rate and current value corresponding to average heat-dissipating power, generate the relational expression of described battery under electric discharge operating mode between heat-dissipating power and discharge current value according to described multiple point by curve fitting algorithm.
9. the device of the heat-dissipating power of battery under measurement time-dependent current operating mode according to claim 8, it is characterized in that, described device also comprises:
Heat-dissipating power and time history form acquisition module, for the discharge time point corresponding according to the actual discharge current value of described battery under actual discharge operating mode, and the relational expression of described battery under electric discharge operating mode between heat-dissipating power and discharge current value, obtain described battery heat-dissipating power and the relational expression between discharge time under described actual discharge operating mode;
And/or,
The duration of charging point corresponding according to the actual charge current value of described battery under reality charging operating mode, and the relational expression of described battery under charging operating mode between heat-dissipating power and charging current value, obtain described battery heat-dissipating power and the relational expression between the duration of charging under described reality charging operating mode.
10. the device of the heat-dissipating power of battery under the measurement time-dependent current operating mode according to any one of claim 6 to 9, it is characterized in that, described device also comprises:
Actual condition heat-dissipating power computation module, for by the actual discharge electric current of described battery under actual discharge operating mode, substitute into the relational expression of described battery heat-dissipating power and discharge current value under electric discharge operating mode, calculate the heat-dissipating power that actual discharge electric current under described actual discharge operating mode is corresponding;
And/or,
By the actual charge current of described battery under reality charging operating mode, substitute into the relation curve of described battery heat-dissipating power and discharge current value under charging operating mode, calculate the heat-dissipating power that actual charge current under described actual operating mode of charging is corresponding.
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