CN112698221B - Ternary lithium ion battery functional test bench and test method thereof - Google Patents
Ternary lithium ion battery functional test bench and test method thereof Download PDFInfo
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- CN112698221B CN112698221B CN202011473625.1A CN202011473625A CN112698221B CN 112698221 B CN112698221 B CN 112698221B CN 202011473625 A CN202011473625 A CN 202011473625A CN 112698221 B CN112698221 B CN 112698221B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a ternary lithium ion battery functionality test bench and a test method thereof, belonging to the technical field of lithium ion batteries and comprising the following steps: fill discharge cabinet, environment storehouse, water-cooling board, water-cooling machine, first temperature sensing monitoring point and second temperature sensing monitoring point, water-cooling machine and water-cooling board are through water piping connection, and the water-cooling board is placed in the environment storehouse, and the battery that awaits measuring is installed on the water-cooling board, and the battery that awaits measuring is connected with filling discharge cabinet, and the battery top that awaits measuring is provided with first temperature sensing monitoring point and second temperature sensing monitoring point respectively with the bottom. According to the invention, whether the battery cell can normally work under the condition that the temperature difference between the bottom and the top of the battery cell is more than 15K is tested by means of bottom cooling and environment heating of the battery cell, and the functionality of the battery cell is verified.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a ternary lithium ion battery functionality test bench and a test method thereof.
Background
With the popularization of new energy automobiles, the performance evaluation method of the electric automobile on the power battery is more and more comprehensive, and the concept of battery thermal management is derived in order to solve the problem of heat dissipation or thermal runaway caused by the fact that the battery works under the condition of overhigh or overlow temperature, so that the overall performance of the battery is improved. A large amount of heat management experiments can be carried out on the module and the battery pack layer, and the maximum temperature difference of the battery system during working is guaranteed to be lower than a certain temperature, so that the stable work of the battery system is guaranteed. If the battery runs in the environment with large temperature difference, the influence on the lithium ion battery can be generated, and no clear data result exists, so that a method for verifying the functionality of the battery running in the environment with large temperature difference is needed urgently.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned deficiencies in the background art for functional verification of cells operating in large temperature differential environments.
In order to realize the purpose, on one hand, the ternary lithium ion battery functional test bench comprises a charging and discharging cabinet, an environment bin, a water cooling plate, a water cooling machine, a first temperature-sensing monitoring point and a second temperature-sensing monitoring point, wherein the water cooling machine is connected with the water cooling plate through a water pipe, the water cooling plate is placed in the environment bin, a battery to be tested is installed on the water cooling plate, the battery to be tested is connected with the charging and discharging cabinet, and the top and the bottom of the battery to be tested are respectively provided with the first temperature-sensing monitoring point and the second temperature-sensing monitoring point.
Further, a heat conducting pad is arranged between the water cooling plate and the battery to be tested.
Further, the battery to be tested is a square aluminum shell battery cell.
On the other hand, the method for testing the functionality of the ternary lithium ion battery by using the battery functionality test bench comprises the following steps:
placing a battery to be tested in an environment bin of the battery functional test bench, and setting the temperature of the battery functional test bench so that the temperature difference between the bottom and the top of the battery to be tested is in a set condition;
when the temperature difference between the bottom and the top of the battery to be tested is in a set condition, the battery to be tested is subjected to charge and discharge tests, and the capacity of the battery to be tested and the temperature difference change between the bottom and the top are monitored in the test process so as to verify whether the battery to be tested can normally work.
Further, and it is right the temperature of battery functional test platform sets up and makes the battery bottom that awaits measuring and top difference in temperature be in the settlement condition, include:
setting the circulating water flow rate of the water cooling plate, the temperature of the water cooling machine and the temperature of the environmental chamber;
through be in the battery bottom of awaiting measuring add water-cooling with under the mode of environment storehouse heating, make the difference in temperature at battery bottom of awaiting measuring and top is in the settlement condition.
Further, the circulation water flow rate is set to be 1.5-2.5L/min, the temperature of the water cooling machine is set to be 2-5 ℃, and the temperature of the environmental chamber is set to be 35-40 ℃.
Further, before the placing the battery to be tested in the environmental chamber of the battery functionality test bench, the method further comprises:
and introducing compressed air into the water cooling plate to detect the air tightness of the water cooling plate and a liquid cooling system formed by the water cooler.
Further, before the placing the battery to be tested in the environmental chamber of the battery functionality test bench, the method further comprises:
at room temperature, adjusting the capacity of the battery to be tested in a stable performance state to 50% SOC in a discharging mode, and performing parameter test to obtain a first test parameter;
when the battery bottom that awaits measuring is in the settlement condition with the top difference in temperature, after carrying out the charge-discharge test to the battery that awaits measuring, still include:
at room temperature, adjusting the capacity of the battery to be tested after the charge and discharge test to 50% SOC in a discharge mode, and performing parameter test to obtain a second test parameter;
and comparing the first test parameter with the second test parameter, and verifying whether the performance of the battery to be tested is changed after the battery to be tested operates under the set condition of the temperature difference between the bottom and the top.
Further, at room temperature, adjusting the capacity of the battery to be tested in the stable performance state to 50% SOC, and before performing the parameter test, the method further includes:
and performing standard charge and discharge tests on the battery to be tested at room temperature to ensure that the battery to be tested is in a stable performance state.
Further, the parameter testing process includes:
a) standing the battery to be tested for 30min when the capacity of the battery to be tested is 50% SOC;
b) discharging the battery to be tested for 18s under 150A, and standing for 40 s;
c) and charging the battery to be tested for 10s under 100A, and standing for 40 s.
Compared with the prior art, the invention has the following technical effects: the battery cell is tested whether the battery cell can normally work under the condition of large temperature difference between the bottom and the top by means of bottom cooling and environment heating of the battery cell, so that the functionality of the battery cell is verified.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of a ternary lithium ion battery functionality test bench;
fig. 2 is a flow chart diagram of a method for testing functionality of a ternary lithium ion battery.
In the figure:
1-charging and discharging cabinet; 2-environmental chamber 3-battery to be tested; 4-water cooling plate; 5-a heat conducting pad; 6-a water cooling machine; 7-a first temperature-sensing monitoring point; 8-second temperature-sensing monitoring point.
Detailed Description
To further illustrate the features of the present invention, refer to the following detailed description of the invention and the accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.
As shown in fig. 1, this embodiment discloses a functional testboard of ternary lithium ion battery, including charge and discharge cabinet 1, environment storehouse 2, water-cooling board 4, water-cooling machine 6, first temperature sensing monitoring point 7 and second temperature sensing monitoring point 8, water-cooling machine 6 and water-cooling board 4 are through water piping connection, water-cooling board 4 is placed in environment storehouse 2, the battery 3 that awaits measuring is installed on water-cooling board 4, the battery 3 that awaits measuring is connected with charge and discharge cabinet 1, and the battery 3 top that awaits measuring is provided with first temperature sensing monitoring point 7 and second temperature sensing monitoring point 8 respectively with the bottom.
It should be noted that, in this embodiment, water-cooling machine 6 and water-cooling plate 4 are connected through suitable water piping, set up the temperature of water-cooling machine 6, incubator and environment storehouse 2, treat to set up the temperature through the mode of carrying out bottom cooling, environmental heating to electric core and reach the back, carry out the charge and discharge test to monomer electricity core to detect whether monomer electricity core can normally work under the great condition of bottom and top difference in temperature.
As a further preferable technical scheme, in order to ensure that the bottom has better heat conductivity, a heat conducting pad 5 is arranged between the water cooling plate 4 and the battery 3 to be tested.
As a further preferable technical scheme, the battery 3 to be tested is a square aluminum shell battery cell.
As shown in fig. 2, the present embodiment discloses a method for testing functionality of a ternary lithium ion battery, where the method for testing functionality of a battery in the foregoing embodiment includes the following steps S1 to S2:
s1, placing the battery 3 to be tested in the environment bin 2 of the battery functional test board, and setting the temperature of the battery functional test board to enable the temperature difference between the bottom and the top of the battery 3 to be tested to be in a set condition;
and S2, when the temperature difference between the bottom and the top of the battery 3 to be tested is in a set condition, performing charge and discharge test on the battery 3 to be tested, and monitoring the capacity of the battery 3 to be tested and the temperature difference change between the bottom and the top in the test process so as to verify whether the battery 3 to be tested can normally work.
It should be noted that, this embodiment is through the temperature that sets up battery functional test platform for 3 bottoms of the battery that awaits measuring and under the top difference in temperature was greater than 15K's the circumstances, carry out the charge-discharge test to the battery 3 that awaits measuring, in order to verify whether the battery 3 that awaits measuring can normally work, and in the test process, the battery 3 that awaits measuring is in free state.
As a further preferable technical solution, the step S1 of setting the temperature of the battery functionality test platform so that the temperature difference between the bottom and the top of the battery to be tested is in a set condition includes:
setting the circulating water flow rate of the water cooling plate 4, the temperature of the water cooler 6 and the temperature of the environmental chamber 2;
through be in the battery bottom of awaiting measuring add water-cooling with under the mode of environment storehouse heating, make the difference in temperature at battery bottom of awaiting measuring and top is in the settlement condition.
Specifically, the circulation water flow rate is set to be 1.5-2.5L/min, the temperature of the water cooling machine 6 is set to be 2-5 ℃, and the temperature of the environmental chamber is set to be 35-40 ℃.
As a more preferable embodiment, in step S1: before placing the battery to be tested in the environmental chamber 2 of the battery functionality test bench, the method further comprises the following steps:
and introducing compressed air into the water cooling plate 4 to detect the air tightness of a liquid cooling system consisting of the water cooling plate 4 and the water cooler 6.
The method specifically comprises the following steps: the water cooling plate 4 and the water cooling machine 6 are connected through a proper water pipe, the air tightness of the liquid cooling system needs to be detected, compressed air with the gauge pressure of 2bar is introduced into the water cooling plate 4, the core body of the water cooling plate 4 is introduced with the compressed air within the pressure maintaining time of 60s, and whether bubbles exist or not is observed.
As a more preferable embodiment, in step S1: before placing the battery to be tested in the environmental chamber 2 of the battery functionality test bench, the method further comprises the following steps:
at room temperature, adjusting the capacity of the battery to be tested in a stable performance state to 50% SOC in a discharging mode, and performing parameter test to obtain a first test parameter;
when the battery bottom that awaits measuring is in the settlement condition with the top difference in temperature, after carrying out the charge-discharge test to the battery that awaits measuring, still include:
at room temperature, adjusting the capacity of the battery to be tested after the charge and discharge test to 50% SOC in a discharge mode, and performing parameter test to obtain a second test parameter;
and comparing the first test parameter with the second test parameter, and verifying whether the electrical property of the battery to be tested is changed after the battery to be tested operates under the set condition of the temperature difference between the bottom and the top.
It should be noted that, in the present embodiment, the same parameter testing method is used for the first testing parameter and the second testing parameter, and the main purpose is to determine the performance degradation of the sample through parameter inspection.
As a further preferable technical solution, before adjusting the capacity of the battery under test at the stable performance state to 50% SOC and performing the parameter test, the method further includes:
and performing standard charge and discharge tests on the battery to be tested at room temperature to ensure that the battery to be tested is in a stable performance state.
It should be noted that, the standard discharging and standard charging currents at room temperature (25 ± 2) ° C are (C/3) a, and the battery is in a stable performance state, and the comparative deviation of the three-cycle discharging capacity is less than 3% in any case.
As a further preferred technical solution, the parameter testing process includes:
a) standing the battery to be tested for 30min when the capacity of the battery to be tested is 50% SOC;
b) discharging the battery to be tested for 18s under 150A, and standing for 40 s;
c) and charging the battery to be tested for 10s under 100A, and standing for 40 s.
The following describes the process of verifying the battery functionality, taking the sample to be tested as an energy type ternary NCM811 lithium ion prismatic battery as an example:
1) standard discharging and standard charging are carried out for three circles at room temperature, so that the battery to be tested is ensured to be in a stable performance state;
2) adjusting the capacity of the battery to be tested to 50% SOC in a discharging mode, and performing parameter testing, wherein the parameter testing process comprises the following steps:
a) standing the battery to be tested for 30min when the capacity of the battery to be tested is 50% SOC;
b) discharging the battery to be tested for 18s under 150A, and standing for 40 s;
c) charging the battery to be tested for 10s under 100A, and standing for 40 s;
3) connecting the water cooling plate 4 and the water cooling machine 6 by a water pipe, setting the circulating water flow rate to be 1.5-2.5L/min, and setting the temperature of the water cooling machine 6 to be 2-5 ℃;
4) setting the temperature of the environmental chamber 2 to be 35-40 ℃;
5) after the set temperature is reached, connecting the whole battery functional test bench according to the figure 1, and carrying out charge and discharge test on the battery to be tested;
6) monitoring the capacity and the temperature change of the top and the bottom of the battery cell in the testing process;
7) and after the test is finished, repeating the operation of the step 2).
It should be noted that, during the test in steps 1), 2), 7), steel clamping plate fixtures are required to be fixed and bound by a certain force; and 5)6), when testing, the battery cell is in a free state.
It should be noted that, in this embodiment, under the condition that water cooling and environmental heating are added to the bottom of the battery cell, it is ensured that the temperature difference between the top and the bottom of the battery cell is greater than 15K, whether the battery cell can normally operate is verified, and whether the basic electrical property of the battery cell changes is verified through parameter tests before and after the test. The method is novel, simple and feasible, and the battery cell functionality can be effectively evaluated through the test.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A ternary lithium ion battery functionality test method is characterized in that a battery functionality test bench is adopted for realizing, wherein the battery functionality test bench comprises a charging and discharging cabinet, an environment bin, a water cooling plate, a water cooling machine, a first temperature sensing monitoring point and a second temperature sensing monitoring point, the water cooling machine is connected with the water cooling plate through a water pipe, the water cooling plate is placed in the environment bin, a battery to be tested is arranged on the water cooling plate, the battery to be tested is connected with the charging and discharging cabinet, and the top and the bottom of the battery to be tested are respectively provided with the first temperature sensing monitoring point and the second temperature sensing monitoring point; a heat conducting pad is arranged between the water cooling plate and the battery to be tested;
the test method comprises the following steps:
placing a battery to be tested in an environment bin of the battery functional test bench, and setting the temperature of the battery functional test bench so that the temperature difference between the bottom and the top of the battery to be tested is in a set condition;
when the temperature difference between the bottom and the top of the battery to be tested is in a set condition, carrying out charge and discharge tests on the battery to be tested, and monitoring the capacity of the battery to be tested and the temperature difference change between the bottom and the top in the test process so as to verify whether the battery to be tested can normally work;
before the battery to be tested is placed in the environmental chamber of the battery functionality test bench, the method further comprises the following steps:
at room temperature, adjusting the capacity of the battery to be tested in a stable performance state to 50% SOC in a discharging mode, and performing parameter test to obtain a first test parameter;
when the battery bottom that awaits measuring is in the settlement condition with the top difference in temperature, after carrying out the charge-discharge test to the battery that awaits measuring, still include:
at room temperature, adjusting the capacity of the battery to be tested after the charge and discharge test to 50% SOC in a discharge mode, and performing parameter test to obtain a second test parameter;
and comparing the first test parameter with the second test parameter, and verifying whether the performance of the battery to be tested is changed after the battery to be tested operates under the set condition of the temperature difference between the bottom and the top.
2. The method for testing functionality of a ternary lithium ion battery of claim 1, wherein the setting the temperature of the battery functionality test stand so that the temperature difference between the bottom and the top of the battery to be tested is in a set condition comprises:
setting the circulating water flow rate of the water cooling plate, the temperature of the water cooling machine and the temperature of the environmental chamber;
through be in the battery bottom of awaiting measuring add water-cooling with under the mode of environment storehouse heating, make the difference in temperature at battery bottom of awaiting measuring and top is in the settlement condition.
3. The method for testing the functionality of the ternary lithium ion battery according to claim 2, wherein the circulating water flow rate is set to be 1.5-2.5L/min, the water-cooling machine temperature is set to be 2-5 ℃, and the environmental chamber temperature is set to be 35-40 ℃.
4. The method of claim 1, wherein prior to placing the battery under test in the environmental chamber of the battery functionality test station, further comprising:
and introducing compressed air into the water cooling plate to detect the air tightness of the water cooling plate and a liquid cooling system formed by the water cooler.
5. The method for functionally testing a ternary lithium ion battery according to claim 1, wherein before adjusting the capacity of the battery under test in a stable performance state to 50% SOC and performing the parametric test at room temperature, the method further comprises:
and performing standard charge and discharge tests on the battery to be tested at room temperature to ensure that the battery to be tested is in a stable performance state.
6. The method for testing functionality of a ternary lithium ion battery of claim 1, wherein the parametric test procedure comprises:
a) standing the battery to be tested for 30min when the capacity of the battery to be tested is 50% SOC;
b) discharging the battery to be tested for 18s under 150A, and standing for 40 s;
c) and charging the battery to be tested for 10s under 100A, and standing for 40 s.
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