CN112180272A - Battery pack service life detection charging and discharging system - Google Patents
Battery pack service life detection charging and discharging system Download PDFInfo
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- CN112180272A CN112180272A CN202010968278.3A CN202010968278A CN112180272A CN 112180272 A CN112180272 A CN 112180272A CN 202010968278 A CN202010968278 A CN 202010968278A CN 112180272 A CN112180272 A CN 112180272A
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- battery pack
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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
- G01R31/387—Determining ampere-hour charge capacity or SoC
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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]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
Abstract
The invention discloses a battery pack service life detection charging and discharging system, which comprises: the charging and discharging device comprises a charging and discharging device, a switcher, a temperature adjusting device and a control computer; the control computer is in communication connection with the switcher, the temperature adjusting device and the charging and discharging equipment, and is used for controlling the switcher, the temperature adjusting device and the charging and discharging equipment; the charging and discharging equipment is electrically connected with the battery pack through the switcher and is used for charging and discharging the battery pack through the switcher; the switch is in communication connection with the BMS of the battery pack. The switching between the charging mode and the discharging mode of the battery pack is realized by controlling the computer control switcher, so that the BMS can start the balancing function timely according to a software strategy to ensure the voltage consistency of the battery pack, and can correct the SOC and the SOH at the same time; the battery pack temperature control system can also timely start a heat management function according to temperature information fed back by the BMS to adjust the temperature of the battery pack through the temperature adjusting device, so that the cycle life performance of the battery system on the whole vehicle can be really and effectively verified when the service life of the battery pack is detected, and the measurement result is more accurate.
Description
Technical Field
The invention relates to the field of battery detection, in particular to a battery pack service life detection charging and discharging system.
Background
The lithium ion battery system is applied to the electric automobile, and the service life of the lithium ion battery system influences the service life of the electric automobile; therefore, the cycle life test is carried out to predict the service life of the battery system, and the method is an important detection item and prediction means in the development process of the battery system. The existing cycle test is generally divided into a full-capacity cycle test (100% DOD) and an interval SOC cycle test, but no matter how many DODs are subjected to the cycle test, the working state of a battery system is always in a discharging mode in the current cycle process, the cycle life capability of the battery can only be basically verified, and a charging loop, a pre-charging loop and a contactor cannot participate in the cycle life test verification together; and because of the software strategy, most BMSs can not start the balancing function in the discharging mode, and the balancing function can effectively ensure the voltage/capacity consistency of the batteries in the battery system and prolong the service life of the battery system. Therefore, the cycle test is only performed in the discharge mode, and the cycle life capability of the battery system cannot be reflected truly and effectively. Therefore, the current cycle test method cannot truly and effectively verify the cycle life capacity of the battery system on the whole vehicle.
Disclosure of Invention
The invention mainly aims to provide a battery pack service life detection charging and discharging system, and aims to solve the technical problem that detection results are not accurate enough due to the fact that an equalization function is not started in the existing battery pack service life detection.
The invention provides a battery pack service life detection charging and discharging system, which comprises: the charging and discharging device comprises a charging and discharging device, a switcher, a temperature adjusting device and a control computer;
the control computer is in communication connection with the switcher, the temperature adjusting device and the charging and discharging equipment, and is used for controlling the switcher, the temperature adjusting device and the charging and discharging equipment;
the charging and discharging equipment is electrically connected with the battery pack through the switcher and is used for charging and discharging the battery pack through the switcher;
the switcher is in communication connection with the BMS of the battery pack;
the switcher receives the temperature information fed back by the BMS and forwards the temperature information to the control computer;
the switch controls the BMS to enter a "charging mode" or a "discharging mode" according to the flow requirement;
the temperature adjusting device is used for carrying out heat exchange on the battery pack according to control of the control computer.
Further, the switcher comprises a controller and a charging and discharging circuit;
the controller is in communication connection with the BMS and the control computer;
the charging and discharging circuit is connected with the battery pack and the charging and discharging equipment;
the charging and discharging circuit comprises a charging circuit, a discharging circuit and a plurality of control switches, the controller is connected with the control switches, the controller controls the on and off of the charging circuit and the discharging circuit through the on and off of the control switches, and only one of the charging circuit and the discharging circuit is in an on state.
Further, the switch further comprises a power supply connected with the controller and the BMS for supplying power to the controller and the BMS.
Furthermore, the charging and discharging circuit also comprises a finished automobile simulation device which is used for simulating the resistance and the capacitance of a finished automobile high-voltage loop;
the whole vehicle simulation device is connected with a control switch in series and is connected between the positive electrode and the negative electrode of the charging circuit, and the whole vehicle simulation device is connected with a control switch in series and is connected between the positive electrode and the negative electrode of the discharging circuit.
Furthermore, the charging and discharging circuit comprises three control switches, wherein the three control switches are respectively a first control switch, a second control switch and a third control switch;
the first control switch is connected with the charging circuit, the second control switch is connected with the discharging circuit, and the third control switch is connected with the whole vehicle simulation device.
Further, the whole vehicle simulation device comprises a first resistor, a second resistor and a capacitor; the first resistor and the capacitor are connected in series to form a series structure, and one end of the capacitor is connected with the third control switch;
one end of the second resistor is connected with the third control switch, and the second resistor is connected with the series structure in parallel.
Further, the charge and discharge circuit includes:
the positive electrode bus is connected with the positive electrode of the charging and discharging equipment;
the negative electrode bus is connected with the negative electrode of the charge and discharge equipment;
the charging positive electrode line is connected with the positive electrode bus;
a charging negative electrode line connected with the negative electrode bus;
the discharging positive electrode wire is connected with the positive electrode bus;
the discharging negative electrode wire is connected with the negative electrode bus;
the charging circuit comprises a charging positive line, a charging negative line, a positive bus and a negative bus;
the discharge circuit comprises a discharge positive line, a discharge negative line, a positive bus and a negative bus.
Further, the battery pack service life detection charge-discharge system further comprises an environment box for containing the battery pack and adjusting the external temperature of the battery pack.
Further, the switcher is in communication connection with the charging and discharging equipment.
The invention has the beneficial effects that: the switching between the charging mode and the discharging mode of the battery pack is realized by controlling the computer control switcher, so that the BMS can start the balancing function timely according to a software strategy to ensure the voltage consistency of the battery pack and correct the SOC of the BMS; the battery pack temperature control system can also timely start a heat management function according to temperature information fed back by the BMS to adjust the temperature of the battery pack through the temperature adjusting device, is closer to the actual working condition of the battery pack, really and effectively verifies the cycle life of a battery system on the whole vehicle when the service life of the battery pack is detected, the measurement result is more accurate, and the technical problem that the detection result is not accurate enough due to the fact that the existing battery pack service life detection does not start an equalization function and the heat management function is solved.
Drawings
Fig. 1 is a schematic structural diagram of a battery pack life detection charge-discharge system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a switch in a battery pack life detection charging and discharging system according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-2, the present invention provides a battery pack life detection charging and discharging system, including: the charging and discharging device 3, the switcher 2, the temperature adjusting device 5 and the control computer 4; the control computer 4 is in communication connection with the switcher 2, the temperature adjusting device 5 and the charging and discharging equipment 3, and the control computer 4 is used for controlling the switcher 2, the temperature adjusting device 5 and the charging and discharging equipment 3; the charging and discharging equipment 3 is electrically connected with the battery pack 1 through the switcher 2, and the charging and discharging equipment 3 is used for charging and discharging the battery pack 1 through the switcher 2; the switch 2 is in communication connection with the BMS of the battery pack 1; the switcher 2 receives the temperature information fed back by the BMS and forwards the temperature information to the control computer 4; the temperature adjusting device 5 is used for performing heat exchange on the battery pack 1 under the control of the control computer 4, and the BMS belongs to the battery system of the battery pack 1.
Specifically, when the battery life is detected, the battery pack 1 needs to be charged and discharged circularly, and the circulating charging and discharging process comprises the following steps:
firstly, the switcher 2 controls the battery pack 1 to enter a charging mode;
secondly, the charging and discharging equipment 3 charges the battery pack 1 according to a charging request sent by the BMS, and in the process, when the battery pack 1 reaches a set high temperature value, the BMS sends a cooling request and the control computer 4 controls the temperature regulating device 5 to cool the battery pack 1;
thirdly, after the battery pack 1 is charged, the battery pack 1 is kept still, the temperature of the battery pack 1 can be continuously reduced in the process, and when the temperature of the battery pack 1 is lower than a set temperature low value, the control computer 4 is controlled to close the temperature adjusting device 5 and send a discharging instruction to the switcher 2;
fourthly, the switcher 2 controls the battery pack 1 to enter a discharging mode;
fifthly, the charging and discharging equipment 3 discharges the battery pack 1 according to a given working condition, in the process, when the battery pack 1 reaches a set high temperature value, the BMS sends a cooling request, and the control computer 4 controls the temperature regulating device 5 to cool the battery pack 1;
sixthly, after the battery pack 1 is discharged, the battery pack 1 is kept still, the temperature of the battery pack 1 can be continuously reduced in the process, and when the temperature of the battery pack 1 is lower than a set temperature low value, the control computer 4 is used for closing the temperature adjusting device 5 and sending a charging instruction to the switcher 2.
It should be noted that, in the present embodiment, the temperature adjusting device 5 is a water cooler. In some embodiments, the temperature control device 5 may not be operated when the battery pack 1 is air cooled.
Has the advantages that: the switching between the charging mode and the discharging mode of the battery pack 1 is realized by controlling the switcher 2 through the control computer 4, so that the BMS can start an equalizing function timely according to a software strategy to ensure the voltage consistency of the battery pack, and can correct the SOC and the SOH at the same time; can also carry out temperature adjustment to battery package 1 through attemperator 5 according to the timely start-up heat management function of the temperature information of BMS feedback, more be close to the actual behavior of battery package 1, carry out life-span detection to battery package 1, real effectual verification battery system is at the cycle life on the whole car, and measuring result is more accurate, solves current battery package life-span detection and does not start balanced function and heat management function and leads to the not accurate technical problem of testing result inadequately.
Further, in some embodiments, the switcher 2 includes a controller 21 and a charge and discharge circuit; the controller 21 is in communication connection with the BMS11 and the control computer 4; the charging and discharging circuit is connected with the battery pack 1 and the charging and discharging equipment 3; the charging and discharging circuit comprises a charging circuit, a discharging circuit and a plurality of control switches, the controller 21 is connected with the control switches, the controller 21 controls the on and off of the charging circuit and the discharging circuit through the on and off of the control switches, and only one of the charging circuit and the discharging circuit is in an on state.
Specifically, the controller 21 is connected with the control computer 4 through a communication line in a communication manner, the controller 21 is controlled by the control computer 4, the controller 21 can control the on-off of the control switch to control the on-off of the charging circuit and the discharging circuit, when the charging circuit is on, the charging and discharging equipment 3 charges the battery pack 1, and at the moment, the discharging circuit is off; when the discharging circuit is switched on, the charging and discharging equipment 3 discharges the battery pack 1, and the charging circuit is switched off; controller 21 communication connection BMS11 can receive 1 temperature information of battery package that BMS11 feedbacks, and then can start the thermal management function in good time according to the temperature condition of battery package 1 and carry out temperature adjustment to battery package 1 through attemperator 5, more is close to the actual behavior of battery package 1, and then can make the detection of battery package 1 life more accurate.
Further, in some embodiments, the switch 2 further includes a power supply 23, and the power supply 23 is connected to the controller 21 and the BMS11 for supplying power to the controller 21 and the BMS 11. The controller 21 and the BMS11 are supplied with power through a power supply 23, which is a 12V dc power supply in this embodiment.
Further, in some embodiments, the charging and discharging circuit further includes a whole vehicle simulation device 22 for simulating a resistance and a capacitance of a whole vehicle high-voltage loop; the whole vehicle simulation device 22 is connected in series with a control switch and is connected between the positive and negative poles of the charging circuit, and the whole vehicle simulation device 22 is connected in series with a control switch and is connected between the positive and negative poles of the discharging circuit. The whole vehicle simulation device 22 simulates the resistance and the capacitance of the whole vehicle high-voltage loop, the values of which need to be adjusted according to the actual whole vehicle condition, and the resistance and the capacitance are used for pre-charging the battery system of the battery pack 1 and are close to the working environment of the battery pack 1 in the whole vehicle, so that the service life of the battery pack 1 can be more accurately detected.
Further, in the present embodiment, the charging and discharging circuit includes three control switches, which are a first control switch K1, a second control switch K2 and a third control switch K3; the first control switch K1 is connected to the charging circuit, the second control switch K2 is connected to the discharging circuit, and the third control switch K3 is connected to the entire vehicle simulation device 22. When charging is needed, the first control switch K1 and the third control switch K3 are firstly switched on to precharge the battery pack 1, and then the third control switch K3 is switched off to start to enter a charging state; when discharging is needed, the second control switch K2 and the third control switch K3 are firstly turned on to precharge the battery pack 1, and then the third control switch K3 is turned off to start to enter a discharging state.
Further, in the present embodiment, the entire vehicle simulation apparatus 22 includes a first resistor R1, a second resistor R2, and a capacitor C1; the first resistor R1 and the capacitor C1 are connected in series to form a series structure, and one end of the capacitor C1 is connected with the third control switch K3; one end of the second resistor R2 is connected with the third control switch K3, and the second resistor R2 is connected in parallel with the series structure. The values of the first resistor R1, the second resistor R2 and the capacitor C1 need to be adjusted according to the actual vehicle condition, and are used for pre-charging the battery system of the battery pack 1.
Further, in this embodiment, the charge and discharge circuit includes:
the positive electrode bus is connected with the positive electrode of the charging and discharging equipment 3;
a negative electrode bus connected to the negative electrode of the charge and discharge device 3;
the charging positive electrode line is connected with the positive electrode bus;
a charging negative electrode line connected with the negative electrode bus;
the discharging positive electrode wire is connected with the positive electrode bus;
the discharging negative electrode wire is connected with the negative electrode bus;
the charging circuit comprises a charging positive line, a charging negative line, a positive bus and a negative bus;
the discharge circuit comprises a discharge positive line, a discharge negative line, a positive bus and a negative bus.
Specifically, the first control switch K1 is connected to the positive charging line, the second control switch K2 is connected to the positive discharging line, and the charging circuit and the discharging circuit can be controlled to be switched on and off by switching on and off the first control switch K1 and the second control switch K2.
Further, in this embodiment, the battery pack life detection charging and discharging system further includes an environmental chamber 6 for accommodating the battery pack 1 and adjusting the external temperature of the battery pack 1. The working environment temperature of the battery pack 1 can be simulated through the environment box 6, and the service life of the battery pack 1 can be more accurately detected.
Further, in some embodiments, the switch 2 is communicatively connected to the charging and discharging device 3. Specifically, in the present embodiment, controller 21 and charging and discharging device 3 are connected through wire 4, and a current or power request fed back by BMS11 during charging may be directly transmitted to charging and discharging device 3 through switch 2, and charging and discharging device 3 adjusts the charging current according to the request. In some embodiments, the current or power request fed back by the BMS11 is forwarded to the control computer 4, and the control computer 4 controls the charging and discharging device 3 to realize charging.
In this embodiment, taking a water-cooled battery pack as an example, the specific working process of the battery pack life detection charge-discharge system is as follows:
step one, the switcher 2 controls the battery pack 1 to enter a charging mode; the step is a process of charging the battery pack 1 by simulating a direct current charging pile through the charging and discharging equipment 3:
the first step comprises the following steps: step 1.1: after the 12V power supply of the switch 2 supplies power to the battery pack 1 and the controller 21, the battery pack 1 will be in a sleep state, the controller 21 closes the K1 and K3 contactors, and the K2 contactor is opened.
Step 1.2: when the switch 2 receives a charging signal command sent by the control computer 4 according to the process flow setting, the controller 21 outputs a high level to the "a +", the "ON level" is a low level, the charging wakes up the BMS11 to enable the battery pack 1 to enter a charging mode, and simultaneously interacts with the BMS11 according to the communication protocol of GB-T-27930-2015, and a high voltage is applied to the charging loop of the battery pack 1 (the BMS11 automatically closes the total negative contactor first, then closes the pre-charging contactor, then closes the fast-charging contactor, and finally opens the pre-charging contactor).
Step 1.3: the controller 21 disconnects the K3 contactor, and the charging and discharging equipment 3 is connected with the quick charging loop of the battery pack 1; meanwhile, the controller 21 feeds back the relevant information (including the individual information, the charging demand information, the power information, etc.) of the BMS11 to the control computer 4 and the charging and discharging device 3.
And step two, the charging and discharging equipment 3 charges the battery pack 1 according to the charging request sent by the BMS 11.
The second step comprises the following steps: 2.1: the charging and discharging device 3 charges the battery pack 1 according to the current or power of the charging request of the BMS 11; in the charging mode, BMS11 will automatically initiate equalization management when the battery voltage differential is excessive.
2.2: in the charging process, when the temperature of the battery is higher than the thermal management threshold (for example, 35 ℃), the BMS11 sends out a thermal management cooling request, and after the control computer 4 receives the thermal management request from the controller 21, the control computer controls the water cooler to start a water cooling cycle and can set the flow rate and the temperature.
2.3: after receiving a charging ending request of the BMS11, the controller 21 sends a charging ending signal to the charging and discharging device 3 and the control computer 4, the charging and discharging device 3 outputs a stopping current to end charging, and jumps to the next standing, and the battery pack 1 automatically disconnects the quick charging contactor and the total negative contactor.
Step three: when the battery pack 1 is kept still, the water cooling machine continues water cooling circulation; when the temperature of the battery is lower than the set value, the control computer 4 turns off the water cooler and sends a discharge signal instruction to the controller 21 according to the setting of the process flow steps, and the switcher 2 can control the battery pack 1 to enter a discharge mode.
Step four, the switcher 2 controls the battery pack 1 to enter a discharging mode "
The fourth step comprises the following steps: 4.1: when the controller 21 receives the discharging signal command, the contactor K1 is turned off, the high level output of "a +" is turned off, and after the BMS11 is dormant, the high level output of "ON shift" is turned to wake up the battery pack 1.
4.2: the K2 and K3 contactors are closed, the controller 21 sends a high voltage command to the BMS11 that a high voltage is present on the discharge circuit of the battery pack 1 (the BMS11 will automatically close the main negative contactor first, then close the pre-charge contactor, then close the main positive contactor, and finally open the pre-charge contactor), and the battery pack 1 enters the "discharge mode".
4.3: the K3 contactor is opened, and the charging and discharging device 3 is connected to the discharging loop of the battery pack 1.
And step five, the charging and discharging equipment 3 discharges the battery pack 1 according to a given working condition.
The fifth step comprises the following steps: 5.1: after the control computer 4 receives that the battery pack 1 enters the discharging mode and the charging and discharging equipment 3 detects the total pressure, the charging and discharging equipment 3 can be controlled to be switched to the discharging step: the constant current discharge can be performed, and the road spectrum working condition can also be given.
5.2: in the discharging process, when the temperature of the battery is higher than the thermal management threshold (for example, 35 ℃), the BMS11 sends out a thermal management cooling request, and the control computer 4 controls the water cooling machine to start a water cooling cycle and can set the flow rate and the temperature after receiving the thermal management starting request from the controller 21.
5.3: when the cell voltage reaches the discharge cutoff condition or receives a discharge termination request of the BMS11, the controller 21 sends a discharge termination signal to the charging and discharging device 3 and the control computer 4, the charging and discharging device 3 outputs a stop current to terminate the discharge, and jumps to the next step of standing, and simultaneously sends a high voltage command to the BMS11 to disconnect the total positive and total negative contactors of the battery pack 1.
Step six: when the battery pack 1 is kept still, the water cooling machine continues water cooling circulation; when the temperature of the battery is lower than the set value, the control computer 4 turns off the water cooler and sends a charging signal instruction to the controller 21 according to the process flow setting of the equipment, and the switcher 2 can control the battery pack 1 to enter a charging mode.
The first step to the sixth step are one cycle of the cyclic charge and discharge process of the battery pack 1.
The invention has the beneficial effects that: the switching between the charging mode and the discharging mode of the battery pack 1 is realized by controlling the switcher 2 through the control computer 4, so that the BMS can start an equalizing function timely according to a software strategy to ensure the voltage consistency of the battery pack, and can correct the SOC and the SOH at the same time; can also carry out temperature adjustment to battery package 1 through attemperator 5 according to the timely start-up heat management function of the temperature information of BMS11 feedback, more be close to the actual behavior of battery package 1, carry out life-span detection time to battery package 1, the real effectual cycle life of verifying battery package 1 on the whole car, measuring result is more accurate, solves current battery package life-span detection and does not start balanced function and heat management function and lead to the not accurate technical problem of testing result inadequately.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A battery pack life detection charging and discharging system is characterized by comprising: the charging and discharging device comprises a charging and discharging device, a switcher, a temperature adjusting device and a control computer;
the control computer is in communication connection with the switcher, the temperature adjusting device and the charging and discharging equipment, and is used for controlling the switcher, the temperature adjusting device and the charging and discharging equipment;
the charging and discharging equipment is electrically connected with the battery pack through the switcher, and the charging and discharging equipment is used for charging and discharging the battery pack through the switcher;
the switcher is in communication connection with the BMS of the battery pack;
the switcher receives the temperature information fed back by the BMS and forwards the temperature information to the control computer;
the switch controls the BMS to enter a charging mode or a discharging mode according to a flow requirement;
the temperature adjusting device is used for controlling heat exchange of the battery pack according to the control computer.
2. The system of claim 1, wherein the switch comprises a controller and a charging and discharging circuit;
the controller is in communication connection with the BMS and the control computer;
the charging and discharging circuit is connected with the battery pack and the charging and discharging equipment;
the charging and discharging circuit comprises a charging circuit, a discharging circuit and a plurality of control switches, the controller is connected with the control switches, the controller controls the charging circuit and the discharging circuit to be switched on and off through the on-off of the control switches, and only one of the charging circuit and the discharging circuit is in a conducting state.
3. The system of claim 2, wherein the switch further comprises a power supply connected to the controller and the BMS for supplying power to the controller and the BMS.
4. The system for detecting the charge and discharge of the battery pack according to claim 2, wherein the charge and discharge circuit further comprises a vehicle simulation device for simulating a resistor and a capacitor of a high-voltage loop of a vehicle;
the whole vehicle simulation device is connected with the control switch in series and is connected between the positive electrode and the negative electrode of the charging circuit, and the whole vehicle simulation device is connected with the control switch in series and is connected between the positive electrode and the negative electrode of the discharging circuit.
5. The system for detecting charging and discharging of battery pack life according to claim 4, wherein the charging and discharging circuit includes three control switches, the three control switches being a first control switch, a second control switch and a third control switch;
the first control switch is connected with the charging circuit, the second control switch is connected with the discharging circuit, and the third control switch is connected with the whole vehicle simulation device.
6. The battery pack life detection charge-discharge system according to claim 5, wherein the entire vehicle simulation device includes a first resistor, a second resistor, and a capacitor; the first resistor and the capacitor are connected in series to form a series structure, and one end of the capacitor is connected with the third control switch;
one end of the second resistor is connected with the third control switch, and the second resistor is connected with the series structure in parallel.
7. The system for detecting charging and discharging of battery pack life according to claim 2, wherein the charging and discharging circuit comprises:
the positive electrode bus is connected with the positive electrode of the charging and discharging equipment;
the negative electrode bus is connected with the negative electrode of the charge and discharge equipment;
the charging positive electrode wire is connected with the positive electrode bus;
a charging negative electrode line connected to the negative electrode bus;
the discharging positive electrode wire is connected with the positive electrode bus;
the discharging negative electrode wire is connected with the negative electrode bus;
the charging circuit comprises a charging positive line, a charging negative line, a positive bus and a negative bus;
the discharge circuit comprises the discharge positive electrode wire, the discharge negative electrode wire, a positive electrode bus and a negative electrode bus.
8. The battery pack life detection charge and discharge system according to claim 1, further comprising an environmental chamber for accommodating the battery pack and adjusting an external temperature of the battery pack.
9. The system of claim 1, wherein the switch is communicatively coupled to the charging and discharging device.
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| CN202010968278.3A CN112180272B (en) | 2020-09-15 | 2020-09-15 | Battery pack service life detection charging and discharging system |
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| CN112180272B CN112180272B (en) | 2023-03-10 |
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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |