CN112540312A - Lithium ion battery testing device - Google Patents
Lithium ion battery testing device Download PDFInfo
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- CN112540312A CN112540312A CN202011594366.8A CN202011594366A CN112540312A CN 112540312 A CN112540312 A CN 112540312A CN 202011594366 A CN202011594366 A CN 202011594366A CN 112540312 A CN112540312 A CN 112540312A
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- 238000012360 testing method Methods 0.000 title claims abstract description 70
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 30
- 239000000110 cooling liquid Substances 0.000 claims abstract description 54
- 238000007599 discharging Methods 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims description 34
- 238000001816 cooling Methods 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000009413 insulation Methods 0.000 claims description 20
- 239000000919 ceramic Substances 0.000 claims description 18
- 239000004065 semiconductor Substances 0.000 claims description 18
- 238000005057 refrigeration Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000009529 body temperature measurement Methods 0.000 abstract description 4
- 239000002826 coolant Substances 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000004321 preservation Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 239000004519 grease Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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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
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Abstract
本发明涉及一种锂离子电池测试装置，所述锂离子电池测试装置包括：保温箱，保温箱中盛放有冷却液，冷却液中浸没被测电池；输入单元，用于接收工作人员输入的电池测试工况和温度阈值；充放电单元，用于为被测电池提供电能；充放电控制单元，用于根据电池测试工况产生充放电控制指令，以控制充放电单元输出电能；温度测量单元，用于测量被测电池的表面温度以及被测电池浸没在冷却液中的环境温度；温度控制单元，分别与输入单元以及温度测量单元连接，且与保温箱连通，用于根据表面温度、环境温度以及温度阈值，控制电池充放电过程中冷却液的温度。实现对锂离子电池进行充放电测试，并保证被测电池在测试过程中维持所期望的测试温度。
The invention relates to a lithium ion battery testing device. The lithium ion battery testing device comprises: an incubator, in which a cooling liquid is contained, and a battery under test is immersed in the cooling liquid; an input unit is used for receiving input from a staff member. Battery test conditions and temperature thresholds; charge and discharge unit, used to provide electrical energy for the battery under test; charge and discharge control unit, used to generate charge and discharge control instructions according to battery test conditions to control the charge and discharge unit to output electrical energy; temperature measurement unit , used to measure the surface temperature of the battery under test and the ambient temperature of the battery under test immersed in the cooling liquid; the temperature control unit is connected to the input unit and the temperature measurement unit respectively, and communicated with the incubator, and is used to measure the surface temperature, environment Temperature and temperature threshold, control the temperature of the coolant during battery charging and discharging. Realize the charging and discharging test of lithium-ion battery, and ensure that the battery under test maintains the desired test temperature during the test.
Description
Technical Field
The invention relates to the field of battery testing, in particular to a lithium ion battery testing device.
Background
The lithium ion battery is an important power source of a new energy automobile, and in order to research the working characteristics of the lithium ion battery, a charge and discharge test of the battery is often required. In order to obtain the operating characteristics of the battery at different operating temperatures, the temperature of the battery needs to be controlled, and the charging and discharging tests of the battery at different battery temperatures are realized. At present, the charging and discharging tests of the lithium ion battery at different temperatures are mainly realized by an independent charging and discharging test system and an independent temperature control box. However, during actual testing, the variation of the battery test current may cause the fluctuation of the heat generation amount of the battery, and thus the variation of the battery temperature. The traditional battery temperature control mode through an independent temperature control box belongs to a passive temperature control mode, and the battery temperature is maintained by blowing air with constant temperature to the surface of the battery. If the air volume is too large, the temperature of the battery can be maintained to be stable, but when the heating power of the battery is small, energy is wasted; on the other hand, if the air volume is too small, although energy consumption can be reduced, the stability of the battery operating temperature cannot be ensured when the temperature of the battery is raised quickly.
Disclosure of Invention
The invention aims to provide a lithium ion battery testing device which can realize the charge and discharge test of a lithium ion battery and ensure that the tested battery maintains an expected testing temperature in the testing process.
In order to achieve the purpose, the invention provides the following scheme:
a lithium ion battery testing device, comprising:
the insulation box is filled with cooling liquid, and the battery to be tested is immersed in the cooling liquid;
the input unit is used for receiving the battery test working condition and the temperature threshold value input by a worker; the battery test working condition is battery charge-discharge voltage and charge-discharge current;
the charging and discharging unit is connected with the tested battery and used for providing electric energy for the tested battery;
the charging and discharging control unit is respectively connected with the charging and discharging unit and the input unit and used for generating a charging and discharging control instruction according to the battery test working condition so as to control the charging and discharging unit to output electric energy;
the temperature measuring unit is used for measuring the surface temperature of the measured battery and the ambient temperature of the measured battery immersed in the cooling liquid;
and the temperature control unit is respectively connected with the input unit and the temperature measuring unit, is communicated with the heat insulation box and is used for controlling the temperature of cooling liquid in the charging and discharging process of the battery according to the surface temperature, the environment temperature and the temperature threshold.
Optionally, the charge and discharge unit includes:
and the power supply module is respectively connected with the charging and discharging control unit and the tested battery and is used for providing electric energy for the tested battery according to the charging and discharging control instruction.
Optionally, the charge and discharge unit further includes:
the positive electrode and the negative electrode of the battery to be tested are respectively connected to the battery support, and the battery support is connected with the power supply module; the power supply module provides electric energy for the tested battery through the battery support.
Optionally, the charge and discharge unit further includes:
and the voltage input module is respectively connected with an external power supply, the charge and discharge control unit and the power supply module and is used for providing constant voltage for the power supply module.
Optionally, the temperature control unit comprises:
the temperature control board is respectively connected with the temperature measuring unit and the input unit and is used for generating a heating instruction or a refrigerating instruction according to the surface temperature, the environment temperature and the temperature threshold value;
the semiconductor refrigeration piece is connected with the temperature control board and used for starting operation according to the refrigeration instruction;
the ceramic heating sheet is connected with the temperature control board and used for starting operation according to the heating instruction;
the semiconductor refrigeration piece and the ceramic heating piece are respectively and tightly attached to two opposite surfaces of the liquid cooling plate, and a liquid outlet of the liquid cooling plate is communicated with the heat insulation box.
Optionally, the temperature control unit further comprises:
and the circulating water pump is placed in the heat insulation box, is immersed in the cooling liquid, is communicated with the liquid inlet of the liquid cooling plate, and is used for pushing the cooling liquid into the liquid cooling plate so that the cooling liquid flows in the liquid cooling plate.
Optionally, the temperature control unit further comprises:
the first relay is respectively connected with the temperature control plate and the semiconductor chilling plate, and the temperature control plate controls the semiconductor chilling plate to operate through the first relay;
and the second relay is respectively connected with the temperature control board and the ceramic heating sheet, and the temperature control board controls the operation of the ceramic heating sheet through the second relay.
Optionally, the temperature control unit further comprises:
the power controller is respectively connected with the temperature control plate, the first relay and the second relay; the temperature control board is also used for generating a power control instruction according to the surface temperature, the environment temperature and the temperature threshold value, and the power controller is used for controlling the output power of the first relay and the second relay according to the power control instruction.
Optionally, the temperature measuring unit comprises:
the first temperature sensor is adhered to the cylindrical surface of the battery to be tested, is connected with the temperature control unit, and is used for measuring the surface temperature of the battery to be tested and transmitting the temperature information of the battery to the temperature control unit;
and the second temperature sensor is placed in the heat insulation box, is immersed in the cooling liquid, is connected with the temperature control unit, and is used for measuring the temperature of the cooling liquid and sending the temperature of the cooling liquid to the temperature control unit.
Optionally, the number of the second temperature sensors is plural.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: according to the invention, the tested battery is immersed in the cooling liquid, the charging and discharging unit is controlled to provide corresponding electric energy for the tested battery according to the test working condition, the temperatures of the tested battery and the cooling liquid are measured in real time, and the temperature control unit further controls the temperature of the cooling liquid according to the temperatures of the tested battery and the cooling liquid, so that the charging and discharging test of the lithium ion battery is realized, and the tested battery is ensured to maintain the expected test temperature in the test process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a module structure of a lithium ion battery testing device according to the present invention;
FIG. 2 is a schematic diagram of the internal module structure of the charge/discharge unit;
FIG. 3 is a schematic diagram of the internal module structure of the temperature control unit;
FIG. 4 is a schematic diagram of an internal module structure of a temperature control unit with a power controller;
fig. 5 is a schematic structural diagram of an internal module of the temperature measuring unit.
Description of the symbols:
1-cooling liquid, 2-heat preservation box, 3-input unit, 4-charge and discharge control unit, 5-charge and discharge unit, 51-power module, 52-battery support, 53-voltage output module, 6-temperature control unit, 61-temperature control board, 62-semiconductor refrigeration piece, 63-ceramic heating piece, 64-liquid cooling board, 65-circulating water pump, 66-first relay, 67-second relay, 68-power controller, 7-temperature measurement unit, 71-first temperature sensor, 72-second temperature sensor and 8-tested battery.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a lithium ion battery testing device, which is characterized in that a tested battery is immersed in cooling liquid, a charging and discharging unit is controlled to provide corresponding electric energy for the tested battery according to a testing working condition, the temperatures of the tested battery and the cooling liquid are detected in real time, a temperature control unit further controls the temperature of the cooling liquid according to the temperatures of the tested battery and the cooling liquid, the charging and discharging test of the lithium ion battery is realized, and the tested battery is ensured to maintain an expected testing temperature in the testing process.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the lithium ion battery test apparatus of the present invention includes: the cooling liquid 1, the heat preservation box 2, the input unit 3, the charging and discharging unit 5, the charging and discharging control unit 4, the temperature measuring unit 7 and the temperature control unit 6.
The cooling liquid 1 is contained in the heat insulation box 2; the cooling liquid 1 is immersed in the battery 8 to be tested; and placing the battery to be tested in the non-conductive cooling liquid, and further realizing the temperature control of the battery through the non-conductive cooling liquid.
The input unit 3 is used for receiving a battery test working condition and a temperature threshold value input by a worker; the battery test working condition is battery charge-discharge voltage and charge-discharge current.
The charging and discharging unit 5 is connected with the tested battery 8, and the charging and discharging unit 5 is used for providing electric energy for the tested battery 8.
The charging and discharging control unit 4 is respectively connected with the charging and discharging unit 5 and the input unit 3, and the charging and discharging control unit 4 is used for generating a charging and discharging control instruction according to the battery test working condition and controlling the charging and discharging unit 5 to output electric energy.
The temperature measuring unit 7 is used for measuring the surface temperature of the measured battery 8 and the temperature of the measured battery 8 immersed in the cooling liquid 1.
The temperature control unit 6 is connected with the input unit 3 and the temperature measuring unit 7 respectively and is communicated with the heat insulation box 2, and the temperature control unit 6 is used for controlling the temperature of the cooling liquid 1 in the battery charging and discharging process according to the surface temperature, the environment temperature and the temperature threshold value.
Specifically, as shown in fig. 2, the charge and discharge unit 5 includes: a power supply module 51. The power module 51 is respectively connected with the charging and discharging control unit 4 and the tested battery 8, and the power module 51 is used for providing electric energy for the tested battery 8 according to the charging and discharging control instruction.
Further, the charge and discharge unit 5 further includes: a battery holder 52. The positive electrode and the negative electrode of the battery 8 to be tested are respectively connected to the battery support 52, and the battery support 52 is connected with the power module 51; the power module 51 supplies electric power to the battery 8 to be tested through the battery support 52. And placing the battery 8 to be tested on the battery support 52, wherein two ends of the battery support 52 are respectively provided with a metal probe which is respectively contacted with the positive electrode and the negative electrode of the battery 8 to be tested. The battery support 52 is electrically connected with the power module 51 through a lead, so that an electric loop is formed between the power module 51 and the tested battery 8, and the charging and discharging of the tested battery 8 can be realized.
In order to improve the detection accuracy, the charge and discharge unit 5 further includes: a voltage output module 53. The voltage output module 53 is respectively connected to an external power supply, the charge and discharge control unit 4 and the power supply module 51, and the voltage output module 53 is configured to provide a constant voltage for the power supply module 51.
Preferably, as shown in fig. 3, the temperature control unit 6 includes: temperature control plate 61, semiconductor chilling plate 62, ceramic heating plate 63 and liquid cooling plate 64.
The temperature control board 61 is connected to the temperature measuring unit 7 and the input unit 3, respectively, and the temperature control board 61 is configured to generate a heating instruction or a cooling instruction according to the surface temperature, the ambient temperature, and the temperature threshold;
the semiconductor refrigeration piece 62 is connected with the temperature control plate 61, and the semiconductor refrigeration piece 62 is used for starting operation according to the refrigeration instruction;
the ceramic heating sheet 63 is connected with the temperature control board 61, and the ceramic heating sheet 63 is used for starting operation according to the heating instruction;
the semiconductor refrigerating sheet 62 and the ceramic heating sheet 63 are respectively and tightly attached to two opposite surfaces of the liquid cooling plate 64, and a liquid outlet of the liquid cooling plate 64 is communicated with the heat insulation box 2.
Further, the temperature control unit 6 further includes: a water circulation pump 65. The circulating water pump 65 is disposed in the incubator 2 and immersed in the cooling liquid 1, and is in communication with the liquid inlet of the liquid-cooling plate 64, and the circulating water pump 65 is configured to push the cooling liquid 1 into the liquid-cooling plate 64, so that the cooling liquid 1 flows in the liquid-cooling plate 64. In the present embodiment, the liquid inlet of the liquid cooling plate 64 is communicated with the circulating water pump 65 through a hose; the liquid outlet of the liquid cooling plate 64 is communicated with the heat preservation box 2 through a hose;
in order to improve the detection accuracy, the temperature control unit 6 further includes: a first relay 66 and a second relay 67.
Specifically, the first relay 66 is respectively connected with the temperature control board 61 and the semiconductor chilling plate 62, and the temperature control board 61 controls the semiconductor chilling plate 62 to operate through the first relay 66;
the second relay 67 respectively with temperature control board 61 reaches ceramic heater chip 63 is connected, temperature control board 61 passes through second relay 67 control ceramic heater chip 63 operates.
Further, as shown in fig. 4, the temperature control unit 6 further includes: a power controller 68. The power controller 68 is connected to the temperature control board 61, the first relay 66, and the second relay 67, respectively; the temperature control board 61 is further configured to generate a power control command according to the surface temperature, the ambient temperature, and the temperature threshold, and the power controller 68 is configured to control the output power of the first relay 66 and the second relay 67 according to the power control command. Specifically, the power control command includes an output current magnitude and an output voltage magnitude.
In order to improve the detection accuracy, as shown in fig. 5, the temperature measuring unit 7 includes: a first temperature sensor 71 and a second temperature sensor 72.
The first temperature sensor 71 is adhered to the cylindrical surface of the battery 8 to be tested, the first temperature sensor 71 is connected with the temperature control unit 6, and the first temperature sensor 71 is used for measuring the surface temperature of the battery to be tested and transmitting the battery temperature information to the temperature control unit 6;
the second temperature sensor 72 is placed in the heat insulation box 2 and immersed in the cooling liquid 1, the second temperature sensor 72 is connected with the temperature control unit 6, and the second temperature sensor 72 is used for measuring the temperature of the cooling liquid 1 and sending the temperature of the cooling liquid 1 to the temperature control unit 6.
Preferably, the number of the second temperature sensors 72 is plural.
In order to improve the testing precision, the lithium ion battery testing device of the invention further comprises: a first communication unit and a second communication unit.
Specifically, the charge and discharge control unit 4 is connected to the charge and discharge unit 5 through the first communication unit.
The temperature measuring unit 7 is connected with the temperature control unit 6 through the second communication unit.
Further, a first filling layer is arranged between the semiconductor chilling plate 62 and the liquid cooling plate 64. A second filling layer is arranged between the ceramic heating sheet 63 and the liquid cooling plate 64. The first filling layer and the second filling layer are both heat-conducting silicone grease. The heat conduction resistance can be effectively reduced by coating heat-conducting silicone grease between the semiconductor refrigeration sheet 62 and the liquid cooling plate 64 and between the ceramic heating sheet 63 and the liquid cooling plate 64.
Furthermore, when the circulating water pump 65 works, the cooling liquid 1 in the thermal insulation box 2 is pushed into the liquid cooling plate 64, flows out of the liquid cooling plate 64 after passing through the flow channel inside the liquid cooling plate 64, and flows back into the thermal insulation box 2 through the hose; the insulation can 2 is provided with a hose through hole, and the hose penetrates into the insulation can 2 through the through hole.
In addition, the working process of the lithium ion battery testing device is as follows:
step 1: the working personnel inputs test working conditions and temperature thresholds specified in the test through the input unit 3, the charge-discharge control unit 4 generates charge-discharge control instructions according to the test working conditions, the temperature control unit 6 obtains an initialized temperature control mode (heating or refrigerating) and temperature control power according to the temperature of the battery 8 to be tested, the temperature of the cooling liquid 1 and the temperature thresholds specified in the test, which are fed back by the temperature measurement unit 7 in real time and are measured by the first temperature sensor 71 and the second temperature sensor 72, and the temperature control unit 6 generates heating instructions or refrigerating instructions to control the temperature of the cooling liquid 1.
Step 2: the power module 51 in the charging and discharging unit 5 provides electric energy for the tested battery 8 according to the received charging and discharging control instruction;
the temperature control board 61 generates a heating instruction or a cooling instruction according to the temperature of the surface of the battery 8 to be measured, the temperature of the cooling liquid 1, and a temperature threshold, and controls the first relay 66 or the second relay 67 according to the cooling instruction or the heating instruction, so as to heat/cool the cooling liquid 1 at a specific power. Meanwhile, the circulating water pump 65 is always operated after the test system is started, so that the continuous circulation of the cooling liquid 1 in the heat preservation box 2 and the liquid cooling plate 64 is realized.
When the cooling liquid 1 flows through the liquid cooling plate 64, it is cooled by the semiconductor chilling plates 62 or heated by the ceramic heating plates 63. After the cooling liquid 1 flows back to the heat insulation box 2 from the liquid cooling plate 64, the cooling liquid 1 in the heat insulation box 2 is cooled or heated, and then the tested battery 8 is cooled or heated.
And step 3: as the testing process proceeds, the temperature control unit 6 calculates the heat generation characteristics of the battery 8 to be tested according to the historical temperature information and the historical testing condition information measured by the first temperature sensor 71 and the second temperature sensor 72, and generates a further temperature control command according to the calculated battery heat generation model in combination with the testing condition of the battery. The temperature control command comprises a heating command or a cooling command.
And 4, step 4: the temperature control board 61 further controls the power controller 68 and the first and second relays 66 and 67 in accordance with the received temperature control command, thereby stably maintaining the battery temperature.
And 5: and (5) circulating the step 3 and the step 4 until the test is completed.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A lithium ion battery testing device, characterized in that, the lithium ion battery testing device includes:
the insulation box is filled with cooling liquid, and the battery to be tested is immersed in the cooling liquid;
the input unit is used for receiving the battery test working condition and the temperature threshold value input by a worker; the battery test working condition is battery charge-discharge voltage and charge-discharge current;
the charging and discharging unit is connected with the tested battery and used for providing electric energy for the tested battery;
the charging and discharging control unit is respectively connected with the charging and discharging unit and the input unit and used for generating a charging and discharging control instruction according to the battery test working condition so as to control the charging and discharging unit to output electric energy;
the temperature measuring unit is used for measuring the surface temperature of the measured battery and the ambient temperature of the measured battery immersed in the cooling liquid;
and the temperature control unit is respectively connected with the input unit and the temperature measuring unit, is communicated with the heat insulation box and is used for controlling the temperature of cooling liquid in the charging and discharging process of the battery according to the surface temperature, the environment temperature and the temperature threshold.
2. The lithium ion battery testing device of claim 1, wherein the charge and discharge unit comprises:
and the power supply module is respectively connected with the charging and discharging control unit and the tested battery and is used for providing electric energy for the tested battery according to the charging and discharging control instruction.
3. The lithium ion battery testing device of claim 2, wherein the charge and discharge unit further comprises:
the positive electrode and the negative electrode of the battery to be tested are respectively connected to the battery support, and the battery support is connected with the power supply module; the power supply module provides electric energy for the tested battery through the battery support.
4. The lithium ion battery testing device of claim 2, wherein the charge and discharge unit further comprises:
and the voltage input module is respectively connected with an external power supply, the charge and discharge control unit and the power supply module and is used for providing constant voltage for the power supply module.
5. The lithium ion battery testing device of claim 1, wherein the temperature control unit comprises:
the temperature control board is respectively connected with the temperature measuring unit and the input unit and is used for generating a heating instruction or a refrigerating instruction according to the surface temperature, the environment temperature and the temperature threshold value;
the semiconductor refrigeration piece is connected with the temperature control board and used for starting operation according to the refrigeration instruction;
the ceramic heating sheet is connected with the temperature control board and used for starting operation according to the heating instruction;
the semiconductor refrigeration piece and the ceramic heating piece are respectively and tightly attached to two opposite surfaces of the liquid cooling plate, and a liquid outlet of the liquid cooling plate is communicated with the heat insulation box.
6. The lithium ion battery testing device of claim 5, wherein the temperature control unit further comprises:
and the circulating water pump is placed in the heat insulation box, is immersed in the cooling liquid, is communicated with the liquid inlet of the liquid cooling plate, and is used for pushing the cooling liquid into the liquid cooling plate so that the cooling liquid flows in the liquid cooling plate.
7. The lithium ion battery testing device of claim 5, wherein the temperature control unit further comprises:
the first relay is respectively connected with the temperature control plate and the semiconductor chilling plate, and the temperature control plate controls the semiconductor chilling plate to operate through the first relay;
and the second relay is respectively connected with the temperature control board and the ceramic heating sheet, and the temperature control board controls the operation of the ceramic heating sheet through the second relay.
8. The lithium ion battery testing device of claim 7, wherein the temperature control unit further comprises:
the power controller is respectively connected with the temperature control plate, the first relay and the second relay; the temperature control board is also used for generating a power control instruction according to the surface temperature, the environment temperature and the temperature threshold value, and the power controller is used for controlling the output power of the first relay and the second relay according to the power control instruction.
9. The lithium ion battery testing device of claim 1, wherein the temperature measuring unit comprises:
the first temperature sensor is adhered to the cylindrical surface of the battery to be tested, is connected with the temperature control unit, and is used for measuring the surface temperature of the battery to be tested and transmitting the temperature information of the battery to the temperature control unit;
and the second temperature sensor is placed in the heat insulation box, is immersed in the cooling liquid, is connected with the temperature control unit, and is used for measuring the temperature of the cooling liquid and sending the temperature of the cooling liquid to the temperature control unit.
10. The lithium ion battery testing device of claim 9, wherein the second temperature sensor is plural in number.
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| CN113764747A (en) * | 2021-08-12 | 2021-12-07 | 岚图汽车科技有限公司 | Method and device for detecting contact thermal resistance of battery thermal management system |
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