Constant temperature device for testing cycle life of battery

Abstract

The utility model provides a battery cycle life test constant temperature device, which comprises a temperature detection module, a voltage comparison module, a polarity overturning module and a Peltier thermoelectric module, and is characterized in that the temperature detection module is used for detecting the temperature in a box; the voltage comparison module is electrically connected with the temperature detection module and is used for detecting whether the temperature exceeds a threshold value or not; the input end of the polarity overturning module is electrically connected with the output end of the voltage comparison module, the output end of the polarity overturning module is electrically connected with the input end of the Peltier thermoelectric module, and the polarity overturning module is used for switching the working state of the Peltier thermoelectric module; the temperature in the box is detected through the temperature detection module and transmitted to the voltage comparison module, the voltage comparison module is compared with a preset temperature threshold value, when it is detected that the temperature in the box exceeds the temperature threshold value, a voltage signal is output to the polarity overturning module, the working state of the Peltier thermoelectric module is changed, the temperature in the box is constant, and the environment temperature test is facilitated. Therefore, the purpose of constant-temperature control is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to a constant temperature device for battery cycle life testing. Background Art

[0002] With the rapid development of technology and the wide application of clean energy, lithium batteries have been widely used in various fields such as electric vehicles, smart phones, and laptop computers due to their high energy density, long life, and environmental protection characteristics. However, the performance and safety of lithium batteries are greatly affected by the ambient temperature, and there are significant differences in the battery cycle life under different temperature conditions. Therefore, it is particularly important to conduct strict ambient temperature tests on lithium batteries during the R & D and trial production stages of battery products to determine the performance under different ambient temperatures and discover potential problems before the batteries are put into use, ensuring that the performance and safety of the batteries meet the requirements.

[0003] A lithium battery constant temperature detection box with the publication number of CN211979151U includes a constant temperature box. A box cover is movably installed on the top of the constant temperature box. A rectangular groove is provided on the inner bottom surface of the constant temperature box. A return frame is slidably clamped in the rectangular groove. Seats are provided at the bottoms of the inner walls around the return frame. A lithium battery block is placed on the top of the seats. A groove is provided at the center of the inner bottom surface of the rectangular groove. A first elastic member is connected to the inner bottom surface of the groove. The first elastic member is connected to a first slider. A first metal plate is provided on the side of the first slider facing away from the first elastic member. A first conductive block is fixedly provided on the side of the first metal plate facing away from the first slider. A second elastic member is fixedly connected to the inner top surface of the installation box. The free end of the second elastic member is fixedly connected to a second slider. A second metal plate is fixedly provided on the side of the second slider facing away from the second elastic member. A second conductive block is fixedly provided on the side of the second metal plate facing away from the second slider. The second metal plate is electrically connected to an indicator light fixedly installed on the top of the installation box through a connecting wire.

[0004] At present, the design of the constant temperature circuit part of the lithium battery constant temperature detection box is relatively complex, and it is unable to effectively control and adjust the temperature inside the box, thus affecting the ambient temperature test. Content of the Utility Model

[0005] In view of this, the utility model provides a constant temperature device for battery cycle life testing, which can effectively control and adjust the temperature inside the box for ambient temperature testing, thus achieving the purpose of constant temperature control.

[0006] The technical solution of the utility model is realized as follows: The utility model provides a constant temperature device for battery cycle life testing, including a temperature detection module, a voltage comparison module, a polarity inversion module, and a Peltier thermoelectric module. Among them,

[0007] The temperature detection module is used to detect the temperature inside the box;

[0008] The voltage comparison module is electrically connected to the temperature detection module and is used to detect whether the temperature exceeds the threshold value;

[0009] The input end of the polarity inversion module is electrically connected to the output end of the voltage comparison module, the output end of the polarity inversion module is electrically connected to the input end of the Peltier thermoelectric module, and the polarity inversion module is used to switch the working state of the Peltier thermoelectric module.

[0010] Based on the above technical solutions, preferably, the voltage comparison module includes a first voltage comparison unit and a second voltage comparison unit. Among them, the input ends of the first voltage comparison unit and the second voltage comparison unit are both electrically connected to the temperature detection module, and the output ends of the first voltage comparison unit and the second voltage comparison unit are both electrically connected to the input end of the polarity inversion module. The first voltage comparison unit is used to detect whether the temperature inside the box is lower than the lower threshold value, and the second voltage comparison unit is used to detect whether the temperature inside the box is higher than the upper threshold value and selectively conduct with the polarity inversion module.

[0011] Based on the above technical solutions, preferably, the first voltage comparison unit includes a resistor R5, a light-emitting diode LED2, a potentiometer VR2, a sliding resistor VR4, a thermistor R1, a comparator U2, a resistor R10, a resistor R7, a resistor R4, and a triode Q2. Among them, the power supply terminal of the power supply is electrically connected to the resistor R5, the potentiometer VR2, the sliding resistor VR4, the power supply terminal of the comparator U2, the resistor R4, and the emitter of the triode Q2 respectively; the other end of the resistor R5 is electrically connected to the positive electrode of the light-emitting diode LED2, the sliding end of the potentiometer VR2 is electrically connected to the non-inverting input terminal of the comparator U2 and the resistor R10 respectively, the other end of the sliding resistor VR4 is electrically connected to the inverting input terminal of the comparator U2 and the thermistor R1 respectively, the negative electrode of the light-emitting diode LED2 is commonly grounded with the other ends of the potentiometer VR2 and the thermistor R1, the output terminal of the comparator U2 is electrically connected to the other ends of the resistor R7 and the resistor R10 respectively, the other end of the resistor R7 is electrically connected to the other end of the resistor R4 and the base of the triode Q2, and the collector of the triode Q2 is electrically connected to the input end of the polarity inversion module 3.

[0012] Based on the above technical solutions, preferably, the second voltage comparison unit includes a resistor R2, a light-emitting diode LED1, a variable resistor VR3, a sliding resistor VR1, a thermistor R8, a comparator U3, a resistor R9, a resistor R6, a resistor R3, a triode Q1, a relay K1, and a diode D1. Among them, the power supply terminals are electrically connected to the resistor R2, the variable resistor VR3, the thermistor R8, the resistor R3, and the emitter of the triode Q1 respectively; the other end of the resistor R2 is electrically connected to the positive electrode of the light-emitting diode LED1, the sliding end of the variable resistor VR3 is electrically connected to the non-inverting input terminal of the comparator U3 and the resistor R9 respectively, the other end of the thermistor R8 is electrically connected to the sliding resistor VR1 and the inverting input terminal of the comparator U3, the negative electrode of the light-emitting diode LED1 is commonly grounded with the other ends of the variable resistor VR3 and the sliding resistor VR1, the output terminal of the comparator U3 is electrically connected to the other ends of the resistor R6 and the resistor R9 respectively, the other end of the resistor R6 is electrically connected to the other end of the resistor R3 and the base of the triode Q1 respectively, the collector of the triode Q1 is electrically connected to the coil of the relay K1 and the negative electrode of the diode D1 respectively, the positive electrode of the diode D1 is commonly grounded with the other end of the coil of the relay K1, one end of the contact of the relay K1 is connected to the power supply, and the other end of the contact is electrically connected to the input terminal of the polarity inversion module 3;

[0013] Both the thermistor R1 and the thermistor R8 are temperature detection modules.

[0014] Based on the above technical solutions, preferably, the polarity inversion module includes a relay K2, a diode D5, a double-pole double-throw switch S1, a terminal block P1, a TVS diode D6, a capacitor C1, and a Peltier thermoelectric module A1. Among them, the collector of the triode Q2 is electrically connected to one end of the coil of the relay K2 and the negative electrode of the diode D5 respectively, the other end of the coil of the relay K2 is commonly grounded with the positive electrode of the diode D5, the double-pole double-throw switch S1 serves as the contact of the relay K2, and the double-pole double-throw switch S1 has six connection terminals. The other end of the contact of the relay K1 is electrically connected to the first connection terminal of the double-pole double-throw switch S1, the second connection terminal is grounded, the third connection terminal is electrically connected to one end of the terminal block P1, the fourth connection terminal is electrically connected to one end of the TVS diode D6, the capacitor C1, and the Peltier thermoelectric module A1 respectively, the fifth connection terminal is grounded, the sixth connection terminal is electrically connected to the power supply terminal, the other end of the terminal block P1 is electrically connected to the other ends of the TVS diode D6, the capacitor C1, and the Peltier thermoelectric module A1 respectively, and the Peltier thermoelectric module A1 is a Peltier thermoelectric module.

[0015] Based on the above technical solutions, preferably, it further includes a timing module, where the timing module is electrically connected to the terminal block P1 and is used to set the turn-off time of the Peltier thermoelectric module.

[0016] Based on the above technical solutions, preferably, the timing module includes a clock chip U1, a resistor R11, a potentiometer VR6, a diode D3, a potentiometer VR5, a diode D2, a voltage stabilizing capacitor C2, a capacitor C3, a resistor R12, a light-emitting diode LED3, a resistor R13, a diode LED4, a diode D4, and a relay K3. Among them, pin 2 of the clock chip U1 is electrically connected to pin 6 of the clock chip U1, the potentiometer VR6, the potentiometer VR5, and the positive electrode of the voltage stabilizing capacitor C2 respectively. The other end of the potentiometer VR5 is electrically connected to the sliding end of the potentiometer VR5 and the negative electrode of the diode D2 respectively. The other end of the potentiometer VR6 is electrically connected to the sliding end of the potentiometer VR6 and the positive electrode of the diode D3 respectively. Pin 7 of the clock chip U1 is electrically connected to the positive electrode of the diode D2, the negative electrode of the diode D3, and the resistor R11 respectively. Pin 8 of the clock chip U1 is electrically connected to pin 4 of the clock chip U1, the power supply terminal, the other end of the resistor R11, and the resistor R12 respectively. The other end of the resistor R12 is electrically connected to the positive electrode of the light-emitting diode LED3. Pin 3 of the clock chip U1 is electrically connected to the negative electrode of the light-emitting diode LED3, the resistor R13, the negative electrode of the diode D4, and one end of the coil of the relay K3 respectively. The other end of the resistor R13 is electrically connected to the positive electrode of the light-emitting diode LED4. The negative electrode of the voltage stabilizing capacitor C2 is commonly grounded to the other end of the capacitor C3, pin 1 of the clock chip U1, the negative electrode of the light-emitting diode LED4, the positive electrode of the diode D4, and the other end of the coil of the relay K3 respectively. The two ends of the contacts of the relay K3 are electrically connected to the two ends of the corresponding terminal block P1 respectively.

[0017] Based on the above technical solutions, preferably, it further includes a box body, a box cover, and a PCB control board. Among them,

[0018] The inside of the box body is hollow, and one side is closed while the other side is provided with an opening;

[0019] The box cover is hinged to the box body and is used to seal the opening of the box body;

[0020] An installation opening is provided on one side of the box body, and the Peltier thermoelectric module is fixed at the installation opening;

[0021] The PCB control board is arranged on the side of the box cover facing the box body. The temperature detection module, the voltage comparison module, the polarity inversion module, the Peltier thermoelectric module, and the timing module are all arranged on the PCB control board and are used to control the Peltier thermoelectric module to heat or cool to achieve constant temperature.

[0022] Based on the above technical solutions, preferably, it further includes a heat insulation layer. Among them, the heat insulation layer is arranged inside the box body, and the outer contour of the heat insulation layer matches the inner contour of the box body. The heat insulation layer is a ceramic heat insulation fiber cloth.

[0023] On the basis of the above technical solutions, preferably, it further includes a sealing plug and a plurality of test cables. Among them, a circular hole is provided on one side of the box body, and the sealing plug abuts in the circular hole for sealing the inside of the box body; a plurality of test cables penetrate through the sealing plug and extend into the box body for use in detecting the battery to be tested.

[0024] The battery cycle life test constant temperature device of the present utility model has the following beneficial effects compared with the prior art:

[0025] (1) The temperature in the test box is detected by the provided temperature detection module. The voltage comparison module receives the temperature signal from the temperature detection module, compares it with the preset temperature threshold. Once it detects that the temperature in the box exceeds the temperature threshold, it outputs a voltage signal to the polarity inversion module to switch the current direction of the Peltier thermoelectric module, thereby changing the working state of the Peltier thermoelectric module to make the temperature in the box constant for performing the ambient temperature test, thus achieving the purpose of constant temperature control;

[0026] (2) Through the provided timing module, by adjusting the resistance values of the potentiometer VR5 and the potentiometer VR6, the oscillation periods of charging and discharging are controlled, and then the relay K3 is driven to automatically switch the on-off state according to the preset period. By setting a certain switching period, while ensuring temperature stability, the overall power consumption is reduced and the service life of the Peltier thermoelectric module is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0028] Figure 1 It is the circuit block diagram of the battery cycle life test constant temperature device of the present utility model;

[0029] Figure 2 It is the three-dimensional view of the battery cycle life test constant temperature device of the present utility model;

[0030] Figure 3 It is the three-dimensional exploded view of the battery cycle life test constant temperature device of the present utility model;

[0031] Figure 4 It is the circuit diagram of the first voltage comparison unit of the battery cycle life test constant temperature device of the present utility model;

[0032] Figure 5 It is the circuit diagram of the second voltage comparison unit of the battery cycle life test constant temperature device of the present utility model;

[0033] Figure 6 It is the circuit diagram of the polarity inversion module of the constant temperature device for battery cycle life test of the present utility model;

[0034] Figure 7 It is the circuit diagram of the timing module of the constant temperature device for battery cycle life test of the present utility model. Specific embodiments

[0035] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0036] As Figure 1-7 shown, a constant temperature device for battery cycle life test of the present utility model includes a temperature detection module 1, a voltage comparison module 2, a polarity inversion module 3, and a Peltier thermoelectric module 4. Among them,

[0037] The temperature detection module 1 is used to detect the temperature inside the box;

[0038] The voltage comparison module 2 is electrically connected to the temperature detection module 1 and is used to detect whether the temperature exceeds the threshold;

[0039] The input end of the polarity inversion module 3 is electrically connected to the output end of the voltage comparison module 2, the output end of the polarity inversion module 3 is electrically connected to the input end of the Peltier thermoelectric module 4, and the polarity inversion module 3 is used to switch the working state of the Peltier thermoelectric module 4.

[0040] It should be noted that the temperature detection module 1 is responsible for real-time detection of the temperature inside the test box. The temperature data will be converted into an electrical signal. The voltage comparison module 2 receives the temperature signal from the temperature detection module 1 and compares it with a preset temperature threshold. This threshold can be set according to the highest and lowest temperature limits of the test requirements. Once it is detected that the temperature inside the box exceeds this range, the voltage comparison module will immediately output a signal. The polarity inversion module 3 receives the signal from the voltage comparison module and determines the current direction of the Peltier thermoelectric module 4 according to the signal content, thereby changing the working state of the Peltier thermoelectric module 4 to make the temperature inside the box constant for the ambient temperature test, thus achieving the purpose of constant temperature control.

[0041] The voltage comparison module 2 in this embodiment includes a first voltage comparison unit 21 and a second voltage comparison unit 22. Among them, the input ends of the first voltage comparison unit 21 and the second voltage comparison unit 22 are both electrically connected to the temperature detection module 1, and the output ends of the first voltage comparison unit 21 and the second voltage comparison unit 22 are both electrically connected to the input end of the polarity inversion module 3. The first voltage comparison unit 21 is used to detect whether the temperature inside the box is lower than the lower threshold, and the second voltage comparison unit 22 is used to detect whether the temperature inside the box is higher than the upper threshold and selectively conduct with the polarity inversion module 3.

[0042] It should be noted that when the temperature inside the box is within the range of the upper and lower thresholds, the main circuit is disconnected and the Peltier thermoelectric module 4 does not work. When the temperature inside the box is lower than the lower threshold, the first voltage comparison unit 21 drives the double-pole double-throw relay to achieve power supply polarity inversion, and the Peltier thermoelectric module 4 heats until the temperature inside the box rises to the preset temperature range; when the temperature inside the box is higher than the upper threshold, the second voltage comparison unit 22 drives the single-pole double-throw relay to connect the main circuit to the power supply, and the Peltier thermoelectric module 4 cools until the temperature inside the box drops to the preset temperature range.

[0043] As a preferred implementation manner, the first voltage comparison unit 21 in this embodiment includes a resistor R5, a light-emitting diode LED2, a potentiometer VR2, a sliding resistor VR4, a thermistor R1, a comparator U2, a resistor R10, a resistor R7, a resistor R4, and a triode Q2. Among them, the power supply terminals of the power supply are respectively electrically connected to the resistor R5, the potentiometer VR2, the sliding resistor VR4, the power supply terminal of the comparator U2, the resistor R4, and the emitter of the triode Q2; the other end of the resistor R5 is electrically connected to the positive electrode of the light-emitting diode LED2, the sliding end of the potentiometer VR2 is respectively electrically connected to the non-inverting input terminal of the comparator U2 and the resistor R10, the other end of the sliding resistor VR4 is respectively electrically connected to the inverting input terminal of the comparator U2 and the thermistor R1, the negative electrode of the light-emitting diode LED2 is commonly grounded with the other ends of the potentiometer VR2 and the thermistor R1, the output terminal of the comparator U2 is respectively electrically connected to the other ends of the resistor R7 and the resistor R10, the other end of the resistor R7 is connected to the other end of the resistor R4 and the base of the triode Q2, and the collector of the triode Q2 is electrically connected to the input end of the polarity inversion module 3.

[0044] It should be noted that an external power supply provides 12V voltage for the entire control board. The model of the thermistor R1 is 10D-5, which is used to collect the ambient temperature. This type of thermistor has high sensitivity and fast response. By adjusting the potentiometer VR2, if the temperature inside the box is within the preset range, the comparator U2 outputs a high level and the triode Q2 is not conducting. When the temperature inside the box is lower than the preset threshold, the voltage at the inverting input terminal increases, the comparator U2 outputs a low level, and the triode Q2 conducts. Since Q2 conducts, the output terminal of the first voltage comparison unit 21 obtains a voltage, which can drive the downstream relay K2 to switch states, activate the power polarity inversion, and the Peltier thermoelectric module 4 starts heating, thereby adjusting the temperature inside the box until the temperature inside the box rises to the preset temperature range.

[0045] As a preferred embodiment, the second voltage comparison unit 22 in this embodiment includes a resistor R2, a light-emitting diode LED1, a variable resistor VR3, a sliding resistor VR1, a thermistor R8, a comparator U3, a resistor R9, a resistor R6, a resistor R3, and a triode Q1, a relay K1, and a diode D1. Among them, the power supply terminals of the power supply are electrically connected to the resistor R2, the variable resistor VR3, the thermistor R8, the resistor R3, and the emitter of the triode Q1 respectively; the other end of the resistor R2 is electrically connected to the positive electrode of the light-emitting diode LED1, the sliding end of the variable resistor VR3 is electrically connected to the non-inverting input terminal of the comparator U3 and the resistor R9 respectively, the other end of the thermistor R8 is electrically connected to the sliding resistor VR1 and the inverting input terminal of the comparator U3, the negative electrode of the light-emitting diode LED1 is commonly grounded with the other ends of the variable resistor VR3 and the sliding resistor VR1, the output terminal of the comparator U3 is electrically connected to the other ends of the resistor R6 and the resistor R9 respectively, the other end of the resistor R6 is electrically connected to the other end of the resistor R3 and the base of the triode Q1 respectively, the collector of the triode Q1 is electrically connected to the coil of the relay K1 and the negative electrode of the diode D1 respectively, the positive electrode of the diode D1 is commonly grounded with the other end of the coil of the relay K1, and one end of the contact of the relay K1 is connected to the power supply, and the other end of the contact is electrically connected to the input terminal of the polarity inversion module 3;

[0046] Both the thermistor R1 and the thermistor R8 are the temperature detection module 1.

[0047] It should be noted that the principle of the second voltage comparison unit 22 is similar to that of the first voltage comparison unit 21. If the temperature inside the box is within the preset temperature range, the comparator U3 outputs a high level and the triode Q1 is not conducting. When the temperature inside the box is higher than the upper limit of the preset threshold, the comparator U3 outputs a low level and the triode Q1 conducts. The state of the double-pole double-throw switch S1 switches to the normally open contact, and the output terminal of the second voltage comparison unit 22 obtains a voltage, thereby providing power for the main circuit. Under the default polarity, the Peltier thermoelectric module 4 starts cooling, thereby adjusting the temperature inside the box until the temperature inside the box drops to the preset temperature range.

[0048] As a preferred embodiment, the polarity inversion module 3 in this embodiment includes a relay K2, a diode D5, a double-pole double-throw switch S1, a terminal block P1, a TVS diode D6, a capacitor C1, and a thermoelectric cooler A1. Among them, the collector of the triode Q2 is electrically connected to one end of the coil of the relay K2 and the negative pole of the diode D5 respectively. The other end of the coil of the relay K2 and the positive pole of the diode D5 are commonly grounded. The double-pole double-throw switch S1 serves as the contact of the relay K2, and the double-pole double-throw switch S1 has six connection terminals. The other end of the contact of the relay K1 is electrically connected to the first connection terminal of the double-pole double-throw switch S1. The second connection terminal is grounded. The third connection terminal is electrically connected to one end of the terminal block P1. The fourth connection terminal is electrically connected to one end of the TVS diode D6, the capacitor C1, and the thermoelectric cooler A1 respectively. The fifth connection terminal is grounded. The sixth connection terminal is electrically connected to the power supply terminal. The other end of the terminal block P1 is electrically connected to the other ends of the TVS diode D6, the capacitor C1, and the thermoelectric cooler A1 respectively. The thermoelectric cooler A1 is a Peltier thermoelectric module 4.

[0049] It should be noted that under normal circumstances, the output terminal voltages of the first voltage comparison unit 21 and the second voltage comparison unit 22 are both 0, and the main circuit is in an open state. When the temperature inside the box is lower than the lower limit of the preset threshold, the first voltage comparison unit 21 obtains a voltage, drives the double-pole double-throw switch S1 to switch states, the power supply polarity is inverted, and the Peltier thermoelectric module 4 starts to heat, thereby adjusting the temperature inside the box. When the temperature inside the box is higher than the upper limit of the preset threshold, the output terminal of the second voltage comparison unit 22 obtains a voltage. Under the default polarity, the Peltier thermoelectric module 4 starts to cool, thereby adjusting the temperature inside the box. Among them, the TVS diode D6 and the capacitor C1 are used to protect the circuit from voltage spikes.

[0050] This embodiment further includes a timing module 5. Among them, the timing module 5 is electrically connected to the terminal block P1 and is used to set the turn-off time of the Peltier thermoelectric module 4.

[0051] As a preferred embodiment, the timing module 5 in this embodiment includes a clock chip U1, a resistor R11, a potentiometer VR6, a diode D3, a potentiometer VR5, a diode D2, a voltage stabilizing capacitor C2, a capacitor C3, a resistor R12, a light-emitting diode LED3, a resistor R13, a diode LED4, a diode D4, and a relay K3. Among them, the pin 2 of the clock chip U1 is electrically connected to the pin 6 of the clock chip U1, the potentiometer VR6, the potentiometer VR5, and the positive electrode of the voltage stabilizing capacitor C2 respectively. The other end of the potentiometer VR5 is electrically connected to the sliding end of the potentiometer VR5 and the negative electrode of the diode D2 respectively. The other end of the potentiometer VR6 is electrically connected to the sliding end of the potentiometer VR6 and the positive electrode of the diode D3 respectively. The pin 7 of the clock chip U1 is electrically connected to the positive electrode of the diode D2, the negative electrode of the diode D3, and the resistor R11 respectively. The pin 8 of the clock chip U1 is electrically connected to the pin 4 of the clock chip U1, the power supply terminal, the other end of the resistor R11, and the resistor R12 respectively. The other end of the resistor R12 is electrically connected to the positive electrode of the light-emitting diode LED3. The pin 3 of the clock chip U1 is electrically connected to the negative electrode of the light-emitting diode LED3, the resistor R13, the negative electrode of the diode D4, and one end of the coil of the relay K3 respectively. The other end of the resistor R13 is electrically connected to the positive electrode of the light-emitting diode LED4. The negative electrode of the voltage stabilizing capacitor C2 is commonly grounded to the other end of the capacitor C3, the pin 1 of the clock chip U1, the negative electrode of the light-emitting diode LED4, the positive electrode of the diode D4, and the other end of the coil of the relay K3 respectively. The two ends of the contacts of the relay K3 are electrically connected to the two ends of the corresponding terminal block P1 respectively.

[0052] It should be noted that based on the clock chip U1 time-base integrated circuit, set to the astable mode, the resistance values of the potentiometer VR5 and the potentiometer VR6 are adjusted to control the oscillation period of charging and discharging, and then drive the relay K3 to automatically switch the on-off state according to the preset period. By setting a certain switching period, while ensuring temperature stability, the overall power consumption is reduced, and the service life of the Peltier thermoelectric module is improved.

[0053] This embodiment also includes a box body 61, a box cover 62, and a PCB control board 63. Among them, the interior of the box body 61 is hollow, and one side is closed while the other side is provided with an opening; the box cover 62 is hinged to the box body 61 for closing the opening of the box body 61; an installation opening is provided on one side of the box body 61, and the Peltier thermoelectric module 4 is fixed at the installation opening; the PCB control board 63 is arranged on the side of the box cover 62 facing the box body 61, and the temperature detection module 1, the voltage comparison module 2, the polarity inversion module 3, the Peltier thermoelectric module 4, and the timing module 5 are all arranged on the PCB control board 63 for controlling the Peltier thermoelectric module 4 to heat or cool to reach a constant temperature.

[0054] This embodiment further includes a heat insulation layer 64. The heat insulation layer 64 is disposed inside the box body 61, and the outer contour of the heat insulation layer 64 matches the inner contour of the box body 61. The heat insulation layer 64 is a ceramic heat insulation fiber cloth. The provided heat insulation layer 64 can achieve a heat preservation effect on the box body 61, further improving the constant temperature effect.

[0055] This embodiment further includes a sealing plug 65 and a plurality of test cables 66. A circular hole is formed in one side of the box body 61, and the sealing plug 65 abuts in the circular hole to seal the inside of the box body 61. The plurality of test cables 66 penetrate through the sealing plug 65 and extend into the box body 61 for use in detecting a battery to be tested. The provided sealing plug 65 enables the cables to extend into the box body 61 to achieve a sealing effect.

[0056] Working principle:

[0057] When the temperature inside the box is lower than the lower limit of the preset threshold, the comparator U2 outputs a low level, the triode Q2 conducts, the output terminal of the first voltage comparison unit 21 obtains a voltage, driving the double-pole double-throw switch S1 to switch states, the power supply polarity is reversed, and the Peltier thermoelectric module 4 starts to heat, thereby adjusting the temperature inside the box;

[0058] When the temperature inside the box is higher than the upper limit of the preset threshold, the comparator U3 outputs a low level, the triode Q1 conducts, the output terminal of the second voltage comparison unit 22 obtains a voltage, and under the default polarity, the Peltier thermoelectric module 4 starts to cool, thereby adjusting the temperature inside the box.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery cycle life test constant temperature device, characterized in that: It comprises a temperature detection module (1), a voltage comparison module (2), a polarity reversal module (3) and a Peltier thermoelectric module (4), wherein: The temperature detection module (1) is used to detect the temperature inside the box; The voltage comparison module (2) is electrically connected to the temperature detection module (1) and is used to detect whether the temperature exceeds a threshold value; The input end of the polarity reversal module (3) is electrically connected to the output end of the voltage comparison module (2), the output end of the polarity reversal module (3) is electrically connected to the input end of the Peltier thermoelectric module (4), and the polarity reversal module (3) is used to switch the working state of the Peltier thermoelectric module (4).

2. The battery cycle life test constant temperature device according to claim 1, characterized in that: The voltage comparison module (2) comprises a first voltage comparison unit (21) and a second voltage comparison unit (22), wherein the input ends of the first voltage comparison unit (21) and the second voltage comparison unit (22) are both electrically connected to the temperature detection module (1), and the output ends of the first voltage comparison unit (21) and the second voltage comparison unit (22) are both electrically connected to the input end of the polarity reversal module (3), the first voltage comparison unit (21) is used to detect whether the temperature inside the box is lower than a lower threshold, and the second voltage comparison unit (22) is used to detect whether the temperature inside the box is higher than an upper threshold, and is selectively connected to the polarity reversal module (3).

3. The battery cycle life test constant temperature device according to claim 2, characterized in that: The first voltage comparison unit (21) comprises a resistor R5, a light emitting diode LED2, a potentiometer VR2, a sliding resistor VR4, a thermistor R1, a comparator U2, a resistor R10, a resistor R7, a resistor R4 and a transistor Q2, wherein the power supply end of the power supply is electrically connected to the resistor R5, the potentiometer VR2, the sliding resistor VR4, the power supply end of the comparator U2, the resistor R4 and the emitter of the transistor Q2 respectively; the other end of the resistor R5 is electrically connected to the positive electrode of the light emitting diode LED2, and the sliding end of the potentiometer VR2 is electrically connected to the positive electrode of the light emitting diode LED2. The comparator U2 is electrically connected to the positive input terminal of the comparator U2 and the resistor R10, the other end of the sliding resistor VR4 is electrically connected to the negative input terminal of the comparator U2 and the thermistor R1 respectively, the cathode of the light emitting diode LED2 and the other end of the potentiometer VR2 and the thermistor R1 are commonly grounded, the output terminal of the comparator U2 is electrically connected to the other end of the resistor R7 and the resistor R10 respectively, the other end of the resistor R7 is electrically connected to the other end of the resistor R4 and the base of the transistor Q2, and the collector of the transistor Q2 is electrically connected to the input terminal of the polarity reversal module (3).

4. The battery cycle life test constant temperature device according to claim 3, characterized in that: The second voltage comparison unit (22) comprises a resistor R2, a light emitting diode LED1, a variable resistor VR3, a sliding resistor VR1, a thermistor R8, a comparator U3, a resistor R9, a resistor R6, a resistor R3 and a transistor Q1, a relay K1 and a diode D1, wherein the power supply end of the power supply is electrically connected to the resistor R2, the variable resistor VR3, the thermistor R8, the resistor R3 and the emitter of the transistor Q1 respectively; the other end of the resistor R2 is electrically connected to the positive electrode of the light emitting diode LED1, the sliding end of the variable resistor VR3 is electrically connected to the non-phase input end of the comparator U3 and the resistor R9 respectively, and the other end of the thermistor R8 is electrically connected to the sliding end The resistor VR1 is electrically connected to the inverting input end of the comparator U3, the cathode of the light emitting diode LED1 and the other end of the variable resistor VR3 and the sliding resistor VR1 are commonly grounded, the output end of the comparator U3 is electrically connected to the other end of the resistor R6 and the other end of the resistor R9 respectively, the other end of the resistor R6 is electrically connected to the other end of the resistor R3 and the base of the transistor Q1 respectively, the collector of the transistor Q1 is electrically connected to the coil of the relay K1 and the cathode of the diode D1 respectively, the anode of the diode D1 and the other end of the coil of the relay K1 are commonly grounded, one end of the contact of the relay K1 is connected to the power supply, and the other end of the contact is electrically connected to the input end of the polarity reversal module (3); The thermistor R1 and the thermistor R8 are both temperature detection modules (1).

5. The battery cycle life test constant temperature device according to claim 4, characterized in that: The polarity reversal module (3) comprises a relay K2, a diode D5, a double-pole double-throw switch S1, a terminal row P1, a TVS tube D6, a capacitor C1 and a semiconductor cooling sheet A1, wherein the collector of the transistor Q2 is electrically connected to one end of the coil of the relay K2 and the negative electrode of the diode D5 respectively, the other end of the coil of the relay K2 and the positive electrode of the diode D5 are commonly grounded, the double-pole double-throw switch S1 serves as a contact of the relay K2, and the double-pole double-throw switch S1 has six connection terminals, and the relay K1 The other end of the contact is electrically connected to the first connection end of the double-pole double-throw switch S1, the second connection end is grounded, the third connection end is electrically connected to one end of the terminal row P1, the fourth connection end is electrically connected to the TVS tube D6, the capacitor C1 and one end of the semiconductor cooling sheet A1 respectively, the fifth connection end is grounded, the sixth connection end is electrically connected to the power supply end, the other end of the terminal row P1 is electrically connected to the TVS tube D6, the capacitor C1 and the other end of the semiconductor cooling sheet A1 respectively, and the semiconductor cooling sheet A1 is a Peltier thermoelectric module (4).

6. The battery cycle life test constant temperature device according to claim 5, characterized in that: It also comprises a timing module (5), wherein the timing module (5) is electrically connected to the end row P1 and is used to set the shut-off time of the Peltier thermoelectric module (4).

7. The battery cycle life test constant temperature device according to claim 6, characterized in that: The timing module (5) comprises a clock chip U1, a resistor R11, a potentiometer VR6, a diode D3, a potentiometer VR5, a diode D2, a voltage-stabilizing capacitor C2, a capacitor C3, a resistor R12, a light-emitting diode LED3, a resistor R13, a diode LED4, a diode D4 and a relay K3, wherein the pin 2 of the clock chip U1 is electrically connected to the pin 6 of the clock chip U1, the potentiometer VR6, the potentiometer VR5 and the positive electrode of the voltage-stabilizing capacitor C2 respectively, the other end of the potentiometer VR5 is electrically connected to the sliding end of the potentiometer VR5 and the negative electrode of the diode D2 respectively, the other end of the potentiometer VR6 is electrically connected to the sliding end of the potentiometer VR6 and the positive electrode of the diode D3 respectively, the pin 7 of the clock chip U1 is electrically connected to the positive electrode of the diode D2, the negative electrode of the diode D3 and the positive electrode of the diode D3 respectively The resistor R11 is electrically connected, the pin 8 of the clock chip U1 is electrically connected to the pin 4 of the clock chip U1, the power supply end, the other end of the resistor R11 and the resistor R12 respectively, the other end of the resistor R12 is electrically connected to the positive electrode of the light-emitting diode LED3, the pin 3 of the clock chip U1 is electrically connected to the negative electrode of the light-emitting diode LED3, the resistor R13, the negative electrode of the diode D4 and one end of the coil of the relay K3 respectively, the other end of the resistor R13 is electrically connected to the positive electrode of the light-emitting diode LED4, the negative electrode of the voltage-stabilizing capacitor C2 is commonly grounded with the other end of the capacitor C3, the pin 1 of the clock chip U1, the negative electrode of the light-emitting diode LED4, the positive electrode of the diode D4 and the other end of the coil of the relay K3 respectively, and the two ends of the contact of the relay K3 are electrically connected to the two ends of the corresponding terminal row P1 respectively.

8. The battery cycle life test constant temperature device according to claim 7, characterized in that: It also includes a box body (61), a box cover (62) and a PCB control board (63), wherein: The box body (61) is hollow inside, with one side being closed and the other side being open; The box cover (62) is hinged on the box body (61) and is used to seal the opening of the box body (61); A mounting opening is provided on one side of the box body (61), and the Peltier thermoelectric module (4) is fixed at the mounting opening; The PCB control board (63) is arranged on a side of the box cover (62) facing the box body (61); the temperature detection module (1), the voltage comparison module (2), the polarity reversal module (3), the Peltier thermoelectric module (4) and the timing module (5) are all arranged on the PCB control board (63) and are used to control the heating or cooling of the Peltier thermoelectric module (4) to achieve a constant temperature.

9. The battery cycle life test constant temperature device according to claim 8, characterized in that: It also includes a heat insulation layer (64), wherein the heat insulation layer (64) is arranged in the box body (61), and the outer contour of the heat insulation layer (64) matches the inner contour of the box body (61), and the heat insulation layer (64) is ceramic heat insulation fiber cloth.

10. The battery cycle life test constant temperature device according to claim 8, characterized in that: It also includes a sealing plug (65) and a plurality of test cables (66), wherein a round hole is opened on one side of the box body (61), and the sealing plug (65) abuts against the round hole to seal the inside of the box body (61); and the plurality of test cables (66) pass through the sealing plug (65) and extend into the box body (61) to be used for testing the battery to be tested.

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