CN111722133A - Power battery detection equipment for electric automobile - Google Patents
Power battery detection equipment for electric automobile Download PDFInfo
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- G—PHYSICS
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- 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
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Abstract
The embodiment of the invention discloses electric automobile power battery detection equipment, which comprises a cabinet body, and an upper computer, a middle computer, a lower computer and a direct current charging gun which are arranged in the cabinet body; the upper computer is used for receiving a battery performance detection instruction, issuing the battery performance detection instruction to the middle computer and the lower computer, setting battery performance detection related parameters and determining a battery performance detection result according to a battery performance test value; the lower computer is respectively connected with the direct current charging gun and the alternating current power grid, is used for executing a charging mode or a discharging mode, and sends acquired current value information and voltage value information to the upper computer; the middle computer is used for receiving the battery data information sent by the BMS and sending the battery data information to the upper computer; the direct current charging gun is connected with a first charging seat of the electric automobile. The detection device can be used for directly detecting the power battery in the electric automobile conveniently, quickly and accurately, so that the user can be helped to effectively evaluate the transport capacity of the electric automobile.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to power battery detection equipment for an electric automobile.
Background
The power battery is used as a power source of the electric automobile, and the performance of the power battery directly influences the dynamic property, comfort and safety of the whole automobile. Before the electric automobile leaves a factory, all performances and safety regulations of the power battery need to pass detection, and the electric automobile can leave the factory after being qualified. However, as the electric vehicle runs, various performances of the power battery are changed or attenuated to different degrees. Therefore, after the electric vehicle is put into use, various performances of the power battery of the electric vehicle need to be detected conveniently and quickly at regular intervals, so that the user can be helped to effectively evaluate the transport capacity of the electric vehicle.
However, most of the devices which can directly detect the power battery installed in the electric automobile are complex in the market at present, and the detection device is connected with the electric automobile in a troublesome manner.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides power battery detection equipment for an electric vehicle, which aims to realize convenient and rapid detection of a power battery installed in the electric vehicle, thereby being beneficial to effective evaluation of the transportation capacity of the electric vehicle by a user.
The embodiment of the invention provides a detection device for a power battery of an electric automobile, which comprises a cabinet body, and an upper computer, a middle computer, a lower computer and a direct-current charging gun which are arranged in the cabinet body;
the upper computer, the middle computer and the lower computer are connected with each other;
the upper computer is used for receiving a battery performance detection instruction and sending the battery performance detection instruction to the middle computer and the lower computer, and is also used for setting battery performance detection related parameters and sending the battery performance detection related parameters to the lower computer, determining a battery performance detection result according to current value information and voltage value information sent by the lower computer and displaying the battery performance detection result; the lower computer is respectively connected with the direct current charging gun and the alternating current power grid, and is used for executing a charging mode or a discharging mode according to the battery performance detection instruction and the battery performance detection related parameters and sending the acquired current value information and the acquired voltage value information to the upper computer;
the middle computer is in communication connection with a battery management system of the electric automobile through the direct-current charging gun, and is used for receiving battery data information sent by the battery management system and sending the battery data information to the upper computer;
the direct current charging gun is connected with a first charging seat of the electric automobile and used for transmitting a first direct current obtained by converting the lower computer to a power battery of the electric automobile and transmitting a second direct current released by the power battery to the lower computer.
In some embodiments, the lower computer comprises a microprocessor, a charge-discharge module, a voltage acquisition module and a current acquisition module, the microprocessor is connected with the charge-discharge module, the voltage acquisition module is respectively connected with the microprocessor and the charge-discharge module, and the current acquisition module is respectively connected with the microprocessor and the charge-discharge module;
the microprocessor is used for controlling the charge and discharge module to execute a charge mode or a discharge mode according to the battery performance detection instruction and the battery performance detection related parameters;
the voltage acquisition module is used for acquiring voltage value information of the output end of the charge and discharge module, and the current acquisition module is used for acquiring current value information of the output end of the charge and discharge module;
the microprocessor is used for sending the voltage value information and the current value information to the upper computer.
In some embodiments, the microprocessor includes a first microprocessor and a second microprocessor, the charging and discharging module includes a rectification and inversion module and a DC/DC conversion module,
in a charging mode, the first microprocessor controls the rectification inversion module to execute a rectification mode, and the second microprocessor controls the DC/DC conversion module to execute a voltage reduction mode;
in the discharging mode, the first microprocessor controls the rectification inversion module to execute an inversion mode, and the second microprocessor controls the DC/DC conversion module to execute a boosting mode.
In some embodiments, the detection apparatus further comprises: an AC charging gun and an AC electric meter,
the alternating current charging gun is respectively connected with the alternating current power grid, a second charging seat of the electric automobile, the central computer and the upper computer, and the alternating current charging gun is used for transmitting alternating current provided by the alternating current power grid to the power battery;
the alternating current meter is used for detecting first alternating current electric quantity input by the direct current side of the electric vehicle power battery detection equipment and second alternating current electric quantity input by the alternating current side.
In some embodiments, the detection apparatus further comprises: the insulation resistance detection device is respectively connected with the upper computer and the direct current charging gun;
the insulation resistance detection device is used for detecting insulation resistance on a direct current side.
In some embodiments, the detection device further comprises an isolation transformer, which is disposed between the ac power grid and the lower computer, for electrical isolation.
In some embodiments, the detection device further comprises a switch, and the middle computer and the lower computer are connected with the upper computer through the switch.
In some embodiments, the detection apparatus further comprises at least one of an ac circuit breaker, an ac contactor, a dc contactor, and a fuse;
the alternating current circuit breaker is arranged between the alternating current power grid and the lower computer;
the alternating current contactor is arranged between the alternating current meter and the alternating current charging gun;
the direct current contactor is arranged between the lower computer and the direct current charging gun;
the fuse is arranged between the lower computer and the direct current charging gun.
The electric vehicle power battery detection device of claim 1, wherein the upper computer is further configured to generate a battery performance detection report and output the battery performance detection report.
In some embodiments, the mid-bit engine comprises an ARM.
In some embodiments, the battery performance detection instructions include: at least one of a charging voltage allowable range value detection instruction, a direct current charging test current value detection instruction, a direct current charging test voltage value detection instruction, a battery internal resistance value DCIR detection instruction, a leakage current value detection instruction, a battery monomer maximum temperature value detection instruction, a battery monomer minimum temperature value detection instruction, a rapid test capacity retention value detection instruction, a direct current charging gun and first charging seat contact impedance value detection instruction, a charging and discharging conversion efficiency value detection instruction, a battery rated total capacity detection instruction, a static voltage precision value detection instruction and a dynamic current precision value detection instruction. The detection equipment for the power battery of the electric automobile comprises a cabinet body, and an upper computer, a middle computer, a lower computer and a direct-current charging gun which are arranged in the cabinet body; the upper computer, the middle computer and the lower computer are connected with each other; the upper computer is used for receiving a battery performance detection instruction and sending the battery performance detection instruction to the middle computer and the lower computer, and is also used for setting battery performance detection related parameters and sending the battery performance detection related parameters to the lower computer, determining a battery performance detection result according to current value information and voltage value information sent by the lower computer and displaying the battery performance detection result; the lower computer is respectively connected with the direct current charging gun and the alternating current power grid, and is used for executing a charging mode or a discharging mode according to the battery performance detection instruction and the battery performance detection related parameters and sending the acquired current value information and the acquired voltage value information to the upper computer; the middle computer is in communication connection with a battery management system of the electric automobile through the direct-current charging gun, and is used for receiving battery data information sent by the battery management system and sending the battery data information to the upper computer; the direct current charging gun is connected with a first charging seat of the electric automobile and used for transmitting a first direct current obtained by converting the lower computer to a power battery of the electric automobile and transmitting a second direct current released by the power battery to the lower computer. The detection device can be used for directly detecting the power battery in the electric automobile conveniently, quickly and accurately, so that the user can be helped to effectively evaluate the transport capacity of the electric automobile.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a schematic structural diagram of an electric vehicle power battery detection apparatus provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lower computer in the electric vehicle power battery detection equipment provided by the embodiment of the invention;
fig. 3 is a schematic structural diagram of a charge-discharge module of a lower computer in the electric vehicle power battery detection device according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of an upper computer in the electric vehicle power battery detection equipment provided by the embodiment of the invention;
fig. 5 is a schematic structural diagram of an electric vehicle power battery detection apparatus according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a detection device for a power battery of an electric automobile, which comprises a cabinet body, and an upper computer, a middle computer, a lower computer and a direct-current charging gun which are arranged in the cabinet body; the upper computer, the middle computer and the lower computer are connected with each other; the upper computer is used for receiving a battery performance detection instruction and sending the battery performance detection instruction to the middle computer and the lower computer, and is also used for setting battery performance detection related parameters and sending the battery performance detection related parameters to the lower computer, determining a battery performance detection result according to current value information and voltage value information sent by the lower computer and displaying the battery performance detection result; the lower computer is respectively connected with the direct current charging gun and the alternating current power grid, and is used for executing a charging mode or a discharging mode according to the battery performance detection instruction and the battery performance detection related parameters and sending the acquired current value information and the acquired voltage value information to the upper computer; the middle computer is in communication connection with a battery management system of the electric automobile through the direct-current charging gun, and is used for receiving battery data information sent by the battery management system and sending the battery data information to the upper computer; the direct current charging gun is connected with a first charging seat of the electric automobile and used for transmitting a first direct current obtained by converting the lower computer to a power battery of the electric automobile and transmitting a second direct current released by the power battery to the lower computer. The detection equipment for the power battery of the electric vehicle provided by the embodiment of the invention can realize convenient and quick detection of the power battery in the electric vehicle, thereby being beneficial to effective evaluation of the transport capacity of the electric vehicle by a user.
Fig. 1 is a schematic structural diagram of an electric vehicle power battery detection device provided in an embodiment of the present invention, and as shown in the figure, the electric vehicle power battery detection device includes a cabinet body, and an upper computer, a middle computer, a lower computer and a dc charging gun which are arranged in the cabinet body; the upper computer, the middle computer and the lower computer are connected with each other; the upper computer is used for receiving a battery performance detection instruction and sending the battery performance detection instruction to the middle computer and the lower computer, and is also used for setting battery performance detection related parameters and sending the battery performance detection related parameters to the lower computer, determining a battery performance detection result according to current value information and voltage value information sent by the lower computer and displaying the battery performance detection result; the lower computer is respectively connected with the direct current charging gun and the alternating current power grid and is used for executing a charging mode or a discharging mode according to the battery performance detection instruction; the middle computer is in communication connection with a battery management system of the electric automobile through the direct-current charging gun, and is used for receiving battery data information sent by the battery management system and sending the battery data information to the upper computer; the direct current charging gun is connected with a first charging seat of the electric automobile and used for transmitting a first direct current obtained by converting the lower computer to a power battery of the electric automobile and transmitting a second direct current released by the power battery to the lower computer.
Specifically, the one end and the alternating current electric wire netting of next machine are connected, the other end of next machine pass through direct current BUS BUS with direct current rifle one end that charges is connected, the other end and the first charging seat of electric automobile of direct current rifle that charges are connected. The lower computer can convert alternating current into direct current and charge a power battery of the electric automobile through a direct current BUS BUS, a direct current charging gun and a first charging seat; the discharging current of the power battery of the electric automobile can be converted into alternating current to feed back to an alternating current power grid, or other loads are supplied with power. As shown in fig. 2, further, the lower computer includes: the charging and discharging device comprises a microprocessor, a charging and discharging module, a voltage acquisition module and a current acquisition module, wherein the microprocessor is connected with the charging and discharging module, the voltage acquisition module is respectively connected with the microprocessor and the charging and discharging module, and the current acquisition module is respectively connected with the microprocessor and the charging and discharging module; the microprocessor is used for controlling the charge and discharge module to execute a charge mode, a discharge mode or a standing mode according to the battery performance detection instruction and the battery performance detection related parameters; the voltage acquisition module is used for acquiring voltage value information of the output end of the charge and discharge module, and the current acquisition module is used for acquiring current value information of the output end of the charge and discharge module; the microprocessor is used for sending the voltage value information and the current value information to the upper computer.
Further, the microprocessor includes a first microprocessor and a second microprocessor, the charging and discharging module includes a rectification and inversion module and a DC/DC conversion module (as shown in fig. 3), in the charging mode, the first microprocessor controls the rectification and inversion module to execute a rectification mode, and the second microprocessor controls the DC/DC conversion module to execute a voltage reduction mode; in the discharging mode, the first microprocessor controls the rectification inversion module to execute an inversion mode, and the second microprocessor controls the DC/DC conversion module to execute a boosting mode.
In an embodiment of the present invention, the first microprocessor and the second microprocessor may be DSP processors, respectively. The rectification inversion module is a three-phase three-level AC/DC bidirectional converter, and can be used for rectification or inversion. The DC/DC conversion module is a step-up/step-down conversion module, and may perform a step-up mode or a step-down mode. In the charging mode, the first microprocessor controls the three-phase three-level AC/DC bidirectional converter to execute a rectification mode, provides stable DC BUS voltage and realizes unit power factor control, and the second microprocessor controls the voltage boosting/reducing conversion module to execute a voltage reducing mode to charge the power battery; under the discharging mode, the second microprocessor controls the voltage boosting/reducing conversion module to execute the voltage boosting mode, and the first microprocessor controls the three-phase three-level AC/DC bidirectional converter to execute the inversion mode, so that the discharging electric energy of the power battery is fed back to a power grid or supplied to other loads. The lower computer adopts voltage and current double closed-loop control, can respectively and accurately control output voltage and output current, also can manually set related parameters of battery performance detection by a user or automatically set related parameters of battery performance detection by the upper computer according to battery data information of a battery management system to control the operation and jump of the lower computer, and can realize the detection control of the battery performance by changing a closed-loop structure and reference given signals of voltage and current loops.
The direct current charging gun is connected with a first charging seat of the electric automobile, and the first charging seat is also a direct current charging socket or a quick charging socket. The direct current charging gun at least comprises a battery positive connecting terminal DC +, a battery negative connecting terminal DC-, a vehicle body ground connecting terminal PE, a data transmission terminal CC1, a detection state signal connecting terminal CC2, a CAN communication positive connecting terminal S +, a CAN communication negative connecting terminal S-, and further comprises a BMS auxiliary source positive connecting terminal A + and a BMS auxiliary source negative connecting terminal A-. In the detection equipment of the power battery of the electric automobile, a battery positive electrode connecting terminal DC + is connected with a positive electrode DC + of a charge-discharge module through a direct current BUS BUS +; the battery negative electrode connecting terminal DC-is connected with the negative electrode DC-of the charge and discharge module through a direct current BUS BUS-; the vehicle body ground connecting terminal PE is connected with the ground terminal of the electric vehicle power battery detection equipment; the data transmission terminal CC1, the detection state signal connection terminal CC2, the CAN communication positive connection terminal S + and the CAN communication negative connection terminal S-are respectively connected with an ARM processor of the middle-position machine; the BMS auxiliary source positive connecting terminal A + and the BMS auxiliary source negative connecting terminal A-are respectively connected with the BMS auxiliary source positive pole and the BMS auxiliary source negative pole through the ARM processor of the central computer. The direct current rifle that charges with electric automobile' S first charging seat is connected, the battery positive connecting terminal DC +, battery negative connecting terminal DC-, automobile body ground connecting terminal PE, data transmission terminal CC1, detection state signal connection terminal CC2, CAN communication positive connecting terminal S +, CAN communication negative connecting terminal S-, BMS auxiliary source positive connecting terminal A +, BMS auxiliary source negative connecting terminal A-of direct current rifle respectively with the positive connecting terminal that charges of first charging seat, the negative connecting terminal that charges, automobile body ground connecting terminal, data transmission terminal, the signal connection terminal is confirmed in charging, CAN communication positive connecting terminal, CAN communication negative connecting terminal, BMS auxiliary source positive connecting terminal, BMS auxiliary source negative connecting terminal one-to-one.
The upper computer, the middle computer and the lower computer are connected through a bus, and the bus is RS485, RS422, RS232, CAN, LIN or any other mode capable of achieving data communication. Further, the middle computer and the lower computer are connected with the upper computer through a switch. The upper computer may be a PC or other computer, as shown in fig. 4, the upper computer includes a processor and a display, and may further include a memory. The upper computer is used for receiving instructions, sending instructions, receiving parameter input, analyzing data, processing and displaying process information and result information. Specifically, the display is configured to receive a battery performance detection instruction, receive the battery performance detection related parameter input by the user, and display the battery performance detection result; the processor is used for issuing the battery performance detection instruction to the middle computer and the lower computer, setting battery performance detection related parameters, sending the battery performance detection related parameters to the lower computer, and determining a battery performance detection result according to current value information and voltage value information sent by the lower computer. In some embodiments, the display is also used for the battery performance detection process, statistical information, battery data information of the BMS.
The middle computer can be an ARM microprocessor and is used as a national standard charging and discharging controller. The central computer is in communication connection with the BMS CAN through the direct current charging gun and the first charging seat.
Specifically, the host computer is used for passing through direct current rifle and electric automobile's battery management system communication connection, the process of establishing communication connection includes: the middle computer executes and judges whether the physical connection of the direct current charging gun and the first charging seat is finished; performing BMS low voltage auxiliary power supply power-up; performing charge and discharge handshake with the BMS. After the communication connection is established, the middle position machine receives battery data information sent by the BMS, wherein the battery data information comprises battery charging parameter information such as charging required voltage, charging required current, rated total voltage and highest allowable charging voltage. The middle computer sends the battery data information to an upper computer; receiving battery performance detection related parameters returned by the upper computer and the maximum output capacity information of the lower computer; and sending the time synchronization information and the maximum output capacity information of the lower computer to the BMS. The maximum output capacity information of the lower computer comprises: a maximum output voltage, a minimum output voltage, a maximum output current, and a minimum output current.
The upper computer is used for receiving a battery performance detection instruction. Specifically, the battery performance detection instruction includes at least one instruction of a charging voltage allowable range value detection instruction, a direct current charging test current value detection instruction, a direct current charging test voltage value detection instruction, a battery internal resistance value DCIR detection instruction, a leakage current value detection instruction, a battery monomer maximum temperature value detection instruction, a battery monomer minimum temperature value detection instruction, a rapid test capacity retention value detection instruction, a direct current charging gun and first charging seat contact impedance value detection instruction, a charging and discharging conversion efficiency value detection instruction, a battery rated total capacity detection instruction, a static voltage precision value detection instruction, and a dynamic current precision value detection instruction. The upper computer is used for issuing the battery performance detection instruction to the middle computer and the lower computer; the upper computer is also used for setting relevant parameters of battery performance detection, and the relevant parameters of battery performance detection comprise parameters such as charging current, charging voltage, discharging current and discharging voltage; the upper computer is used for executing at least one detection item of detection of a charging voltage allowable range value, detection of a direct current charging test current value, detection of a direct current charging test voltage value, detection of a battery internal resistance value DCIR, detection of a leakage current value, detection of a battery monomer highest temperature value, detection of a battery monomer lowest temperature value, detection of a rapid test capacity retention value, detection of a contact impedance value of a direct current charging gun and a first charging seat, detection of a charging and discharging conversion efficiency value, detection of a battery rated total capacity, detection of a static voltage precision value and detection of a dynamic current precision value based on a discharging mode and a charging mode of the lower computer; the upper computer receives voltage value information and current value information fed back by the lower computer in the process of executing each detection project, determines a battery performance detection result according to the voltage value information and the current value information, and is used for displaying the battery performance detection result. Further, the determining, by the upper computer, the battery performance detection result according to the voltage value information and the current value information specifically includes: the upper computer calculates according to a preset calculation relationship among the current value information, the voltage value information and the battery performance detection related test value to obtain the battery performance detection related test value; and the upper computer compares the relevant test value and the relevant reference value of the battery performance detection to obtain the battery performance detection result.
The following description exemplifies a method for detecting a test value related to each battery performance detection detected by an electric vehicle power battery, and a method for determining a corresponding battery performance detection result.
The DCIR is used for detecting the internal resistance and the impedance of the battery of the whole electric vehicle, and comprises a direct current charging gun and a first charging seat, wherein the contact impedance of the direct current charging gun and the first charging seat is required to be less than 200m omega, the DCIR can be used for judging the heating condition of the battery and an electric circuit thereof in the charging process of the electric vehicle, the ignition problem in the charging process can be effectively prevented, and particularly the heating ignition problem caused by the conditions that the first charging seat port is connected with a large number of plugs or the battery pack is internally provided with a module and an electric core is loosened. The detection method of DCIR is as follows: the upper computer sets the first charging voltage according to a first voltage preset relation between the charging demand voltage in the battery data information of the BMS and the first charging voltage in the battery performance detection related parameters, sets the first charging current according to a first current preset relation between the charging demand current and the first charging current, and sets the current loading duration as a first preset duration; the lower computer carries out charging according to the first charging voltage and the first charging current, the charging time is a first preset time, current value information I2 and voltage value information V2 collected in the charging process are fed back to the upper computer, the upper computer calculates the value of the DCIR according to the preset relation between the DCIR and the current value information and the voltage value information, the upper computer judges whether the value of the DCIR is within the DCIR reference range value, if the value of the DCIR is within the DCIR reference range value, the DCIR detection result is determined to be passed, and if not, the DCIR detection result is determined to be not passed. Wherein the first voltage preset relationship may be: the charging requirement voltage is less than or equal to a first charging voltage and less than or equal to a, wherein the voltage value a is greater than the charging requirement voltage, and the value of a can be set as required; the first current preset relationship may be: b is less than or equal to the first charging current and less than or equal to the charging demand current, wherein the current value b is less than the charging demand current, and the value of b can be set as required; the preset relationship between the DCIR and the current value information and the voltage value information is as follows: the method comprises the following steps of (1) DCIR (DCIR) | V2-V1|/I2, wherein V1 is voltage value information collected in a standing stage; the DCIR reference range value is preset. In some embodiments, it is also desirable to preset the voltage range values for the DCIR evaluation. And detecting the leakage current value, wherein the leakage current value is less than or equal to 0.5mA, and the leakage current value is used for detecting the leakage current of the detection equipment to the automobile body in the process of charging the electric automobile by the electric automobile power battery detection equipment and avoiding people from contacting the automobile body to get an electric shock. After the second charging current and the second charging voltage are set, in a charging mode, the lower computer collects the current values of DC + and DC-of the direct current charging gun, the current values are leakage current values, the leakage current values are sent to the upper computer, the upper computer judges whether the leakage current values are less than or equal to 0.5mA, and if yes, the leakage current value detection result is determined to pass; otherwise, determining that the detection result of the leakage current value does not pass.
And (3) detecting a capacity retention value quickly, wherein after the electric automobile runs for a certain kilometer distance, the percentage value of the battery cycle charge and discharge to the initial capacity is reduced. The capacity retention rate is divided into a charge capacity retention rate and a discharge capacity retention rate, and the charge capacity retention rate test is carried out when the SOC of the battery is below 50%. And testing the discharge capacity retention rate of the battery SOC at more than 50%, judging the range of the retention rate according to the driving mileage of the electric automobile, and further judging whether the battery performance meets the requirements. Setting methods of a third charging current and a third charging voltage in a charging mode are respectively the same as the setting methods of the first charging current and the first charging voltage, and setting a charging and discharging time length to be a second preset time length, specifically setting according to needs, and setting a charging or discharging SOC value, for example, the charging or discharging SOC value is 10%; in the discharge mode, the setting of the first discharge voltage satisfies: c is less than or equal to the first discharge voltage and less than or equal to the rated total voltage, the voltage value c is less than the rated total voltage, and the voltage value c is specifically set as required; the setting of the first discharge current satisfies: b is less than or equal to the first discharging current and less than or equal to the charging demand current, wherein the current value b is less than the charging demand current, and the value of b can be set according to requirements. Charge available capacity retention value ═ Ct/C0100% of C, wherein0Capacity available for actual initial charging, Ct＝C1SOC value of charging or discharging, where C1When the electric automobile is charged in the change range of the charging or discharging SOC value, the charging capacity of the power battery is increased. The upper computer calculates a charging available capacity retention rate value according to the relation, compares the charging available capacity retention rate value with a preset capacity retention rate range value, and determines that the detection result of the charging available capacity retention rate value is passed if the charging available capacity retention rate value is within the preset capacity retention rate range value; otherwise, determining that the charging available capacity retention value detection result is failed. Method for detecting discharge available capacity retention value and chargingThe detection method of the electric available capacity retention value is the same, and is not described in detail herein.
The direct current charging gun and the first charging seat contact impedance value are detected, the direct current charging gun is continuously plugged and pulled in and out during charging of the electric automobile, the contact impedance of a terminal contact surface is increased due to friction, abrasion and oxidation in the process, the phenomenon that heating is generated at last due to the fact that the direct current charging gun and the first charging seat impedance are increased in the charging process is prevented, and the contact impedance is less than 5m omega. In the charging mode, the setting methods of the fourth charging current and the fourth charging voltage are respectively the same as the setting methods of the first charging current and the first charging voltage, and the charging time length is set to be a third preset time length which is specifically set according to needs. In the standing stage, the middle position machine collects the voltage values of a first voltage point and a second voltage point of the direct current charging gun, wherein the voltage values are V1 'and V2'; in the charging stage, the middle computer collects the voltage values of a first voltage point and a second voltage point of the direct-current charging gun again, the voltage values are respectively V1 and V2, the lower computer uploads the current value information I in the charging stage to the upper computer, the upper computer obtains a contact impedance value according to a preset calculation relation, wherein the contact impedance value R is [ (V2-V2 ') - (V1-V1') ]/I, and judges whether the contact impedance value is within a preset contact impedance reference range value, if so, the detection result of the contact impedance value is determined to be passed; otherwise, determining that the detection result of the contact resistance value is not passed.
The method comprises the following steps of detecting the charging and discharging conversion efficiency value, wherein the loss of the battery caused by a plurality of factors including leakage current between a positive electrode and a negative electrode, internal resistance of the battery, connection power lines, electrochemical efficiency of battery materials and the like in the charging and discharging process is detected, so that the battery cannot perfectly store and discharge all energy, the charging and discharging conversion efficiency comprises AH conversion efficiency and KWh conversion efficiency, and the conversion efficiency value is generally larger than 90%. And setting a fifth charging current and a fifth charging voltage in a charging mode, wherein the setting methods of the fifth charging current and the fifth charging voltage are respectively the same as the setting methods of the first charging current and the first charging voltage, and the charging time length is set to be a fourth preset time length which is specifically set according to needs. In the discharge mode, the setting of the second discharge voltage satisfies: c is less than or equal to the second discharge voltage and less than or equal to the rated total voltage, and the voltage value c is less than the rated total voltageThe voltage value c is specifically set according to needs; the setting of the second discharge current satisfies: b is less than or equal to the second discharging current and less than or equal to the charging demand current, wherein the current value b is less than the charging demand current, and the value of b can be set according to requirements. Obtaining a charging capacity C in a charging modeCharging deviceObtaining discharge capacity C in discharge modePutAccording to the relation, the charging-discharging conversion efficiency value is CPut/CCharging device100%, calculating to obtain a charge-discharge conversion efficiency value, judging whether the charge-discharge conversion efficiency value is within a preset charge-discharge conversion efficiency value range value, and if so, determining that the charge-discharge conversion efficiency value detection result is a pass; otherwise, determining that the charging and discharging conversion efficiency value detection result is failed.
And detecting the allowable range value of the charging voltage, setting a sixth charging current and a sixth charging voltage in a charging mode, setting the setting method of the sixth charging current and the sixth charging voltage to be the same as the setting method of the first charging current and the first charging voltage respectively, and setting the charging time length to be a fifth preset time length specifically according to the requirement. The lower computer is charged according to a sixth charging current and a sixth charging voltage, the BMS sends the charging voltage allowable range value information to the middle computer, the middle computer sends the charging voltage allowable range value information to the upper computer, the upper computer judges whether the charging voltage allowable range value is within a preset charging voltage allowable range value, and if yes, the charging voltage allowable range value detection result is determined to be passed; otherwise, determining that the detection result of the allowable range value of the charging voltage is failed.
Detecting the direct current charging test current value and the direct current charging test voltage value, and setting a seventh charging voltage and a seventh charging current in a charging mode, wherein the seventh charging voltage meets the following relationship: d is less than or equal to the seventh charging voltage and less than or equal to the highest allowable charging voltage, wherein the voltage value d is less than the charging demand voltage, and the value of d can be set according to the requirement; the seventh charging current satisfies the following relationship: b is less than or equal to the seventh charging current and less than or equal to the charging demand current, wherein the current value b is less than the charging demand current, and the value of b can be set according to requirements. The charging time length is required to be set to a sixth preset time length, and the charging time length is specifically set according to needs. And the lower computer is charged according to the seventh charging current and the seventh charging voltage, the BMS sends the charging voltage measured value information and the charging current measured value to the middle computer, the middle computer sends the charging voltage measured value information and the charging current measured value to the upper computer, and the upper computer judges whether the charging voltage measured value information is in a preset charging voltage value range value, if so, the detection result of the direct current charging test voltage value is determined to be passed, otherwise, the detection result of the direct current charging test voltage value is determined to be failed. Comparing the sampled current value fed back by the lower computer of the upper computer with the charging current measured value, if the difference range of the sampled current value and the charging current measured value meets the preset difference range, determining that the detection result of the direct current charging test current value passes, and otherwise, determining that the detection result of the direct current charging test current value does not pass.
The method for detecting the maximum temperature value of the battery monomer, the minimum temperature value of the battery monomer and the rated total capacity of the battery is the same as the method for detecting the direct-current charging test current value.
Detecting the precision value of static voltage, setting the standing time of the upper computer, and collecting the voltage V of the DC charging gun by the middle computer in the standing stageGunBMS feedback of charging voltage measurement value VBMSAccording to the formula: static voltage precision value ═ VGun-VBMS)/VGunAnd 100%, calculating to obtain a static voltage precision value, judging whether the static voltage precision value is within a preset static voltage precision value range value, if so, determining that the static voltage precision value detection result is passed, otherwise, determining that the static voltage precision value detection result is not passed.
Detecting the dynamic current precision value, and setting the eighth charging voltage and the eighth charging current I in the charging mode8The eighth charging voltage satisfies the relationship: the charging required voltage is less than or equal to the eighth charging voltage and less than or equal to a, wherein the voltage value a is greater than the charging required voltage, and the value of a can be set as required; the eighth charging current satisfies the relationship: b is less than or equal to eighth charging currentAnd the current value b is smaller than the charging demand current, and the value of b can be set according to requirements. In the charging mode, the BMS measures the charging current IBMSSending to a central computer, wherein the central computer sends IBMSSending the data to an upper computer, wherein the upper computer is used for: dynamic current precision value ═ I8-IBMS)/I8And 100%, calculating to obtain a dynamic current precision value, judging whether the dynamic current precision value is within a preset dynamic current precision value range value, if so, determining that the detection result of the dynamic current precision value is passed, otherwise, determining that the detection result of the dynamic current precision value is not passed.
The detection equipment for the power battery of the electric automobile comprises a cabinet body, and an upper computer, a middle computer, a lower computer and a direct-current charging gun which are arranged in the cabinet body; the upper computer, the middle computer and the lower computer are connected with each other; the upper computer is used for receiving a battery performance detection instruction and sending the battery performance detection instruction to the middle computer and the lower computer, and is also used for setting battery performance detection related parameters and sending the battery performance detection related parameters to the lower computer, determining a battery performance detection result according to current value information and voltage value information sent by the lower computer and displaying the battery performance detection result; the lower computer is respectively connected with the direct current charging gun and the alternating current power grid, and is used for executing a charging mode or a discharging mode according to the battery performance detection instruction and the battery performance detection related parameters and sending the acquired current value information and the acquired voltage value information to the upper computer; the middle computer is in communication connection with a battery management system of the electric automobile through the direct-current charging gun, and is used for receiving battery data information sent by the battery management system and sending the battery data information to the upper computer; the direct current charging gun is connected with a first charging seat of the electric automobile and used for transmitting a first direct current obtained by converting the lower computer to a power battery of the electric automobile and transmitting a second direct current released by the power battery to the lower computer. The detection device can be used for directly detecting the power battery in the electric automobile conveniently, quickly and accurately, so that the user can be helped to effectively evaluate the transport capacity of the electric automobile.
The above detection items can be detected independently, and all the detection items can be detected in sequence, namely, the detection is started from the first detection item until the last detection item is detected, when all the detection items are detected in sequence, a standing stage is set in every two detection items, and the standing time of the standing stage is set according to needs.
In some embodiments, the upper computer of the electric vehicle power battery detection device is further configured to generate a battery performance detection report and output the battery performance detection report.
Specifically, the battery performance detection report may detect information such as time, a detection number, vehicle basic information, a detection item, a test value, a reference range value, a detection result, and a reference standard. The battery performance detection report can be output in document formats such as Excel, Word, TXT and the like or other formats, so that a user can know the relevant information of the battery performance detection at a glance, and the decision efficiency of the user is improved.
As shown in fig. 5, in some embodiments, the electric vehicle power battery detection apparatus further includes: the alternating current charging gun is respectively connected with the alternating current power grid, the second charging seat of the electric automobile, the middle computer and the upper computer; the alternating current meter is used for detecting first alternating current electric quantity input by the direct current side of the electric vehicle power battery detection equipment and second alternating current electric quantity input by the alternating current side. Specifically, the input end of the ac charging gun is connected to the ac power grid, the output end of the ac charging gun is connected to a second charging seat of the electric vehicle, and the second charging seat is also an ac charging seat or a slow charging seat. The alternating current charging gun is also in communication connection with the central computer and the lower computer. The alternating current charging gun comprises a live wire connecting terminal L, a zero line connecting terminal N and a CP connecting terminal. One end of a live wire connecting terminal L of the alternating current charging gun is connected with a live wire of an alternating current power grid, and the other end of the live wire connecting terminal L of the alternating current charging gun is connected with a live wire connecting terminal of a second charging seat; one end of a zero line connecting terminal N of the alternating current charging gun is connected with a zero line of an alternating current power grid, and the other end of the zero line connecting terminal N of the alternating current charging gun is connected with a zero line connecting terminal of a second charging stand; one end of a CP connecting terminal of the alternating-current charging gun is connected with the middle position machine, and the other end of the CP connecting terminal of the second charging seat is connected. The central computer executes and judges whether the physical connection between the alternating current charging gun and the second charging seat is completed. The upper computer receives an alternating current charging test current value detection instruction and/or an alternating current charging test voltage value detection instruction, and issues the alternating current charging test current value detection instruction and/or the alternating current charging test voltage value detection instruction to the alternating current charging gun; the upper computer is used for setting relevant parameters of battery performance detection and sending the relevant parameters of the battery performance detection to the alternating current charging gun, and the alternating current charging gun executes an alternating current charging mode according to the relevant parameters of the battery performance detection; the upper computer is used for executing alternating current charging test current value detection and/or alternating current charging test voltage value detection based on the alternating current charging mode.
The alternating current meter is connected to the output end of the alternating current power grid and used for detecting first alternating current electric quantity input by the direct current side and second alternating current electric quantity input by the alternating current side of the electric vehicle power battery detection equipment. Through the alternating current meter, the second alternating current quantity, the alternating current charging test current value and/or the alternating current charging test voltage value, the detection of the charging protection logic of the vehicle-mounted charger OBC can be realized, the detection of the power limiting function is included, and the safety risks such as damage of the charger and the like caused by the fact that the charger OBC exceeds the capacity of an alternating current pile during operation are prevented.
The detection process of the AC charging test current value is illustrated as follows: taking down the direct current charging gun, inserting the alternating current charging gun into a second charging seat, setting alternating current by an upper computer, wherein the alternating current charging current can be 10A, 16A, 32A or 63A, and is specifically set according to requirements; and setting the alternating current charging time according to the requirement. In the alternating current charging stage, the upper computer controls the central computer to send PWM to an OBC (on-board diagnostics) of a self-contained charger of the electric automobile, and the OBC controls charging current I according to duty ratioCharging deviceReading the second AC electric quantity I by the AC electric meterWatch (A)And sending to an upper computer, and judging I by the upper computerCharging deviceAnd IWatch (A)If so, determining that the detection result of the alternating current charging test current value is passed, otherwise, determining that the detection result of the alternating current charging test current value is not passed.
In some embodiments, the electric vehicle power battery detection apparatus further includes: the insulation resistance detection device is respectively connected with the upper computer and the direct current charging gun; the insulation resistance detection device is used for detecting the insulation resistance of the direct current side.
Specifically, the positive electrode of the insulation resistance detection device is connected with the DC + of the direct current charging gun, and the negative electrode of the insulation resistance detection device is connected with the DC-of the direct current charging gun.
The resistance value detected at the direct current side is larger than 500 omega/V, loading voltage and setting duration time in relevant parameters of battery performance detection are set according to the maximum voltage Vbmax of the battery, the upper computer sends the loading voltage and the duration time to an insulation resistance detection device, the insulation resistance detection device can be an insulation detector on the market, the insulation resistance detection device adjusts output voltage according to the loading voltage, the insulation resistance detection device sends the measured insulation resistance value to the upper computer, the upper computer judges whether the insulation resistance value is within a preset resistance range value or not, if yes, the insulation resistance value detection result is determined to be passed, and if not, the insulation resistance value detection result is determined to be not passed. The insulation resistance detection aims to prevent the damage of leakage current to human bodies in the charging process.
In some embodiments, the detection of the insulation resistance may also be performed by an unbalanced bridge method to realize the detection of the insulation resistance value.
In some embodiments, the electric vehicle power battery detection device further includes an isolation transformer, where the isolation transformer is disposed between the ac power grid and the charge and discharge module, and is used for electrical isolation.
In some embodiments, the electric vehicle power battery detection apparatus further comprises at least one of an ac circuit breaker, an ac contactor, a dc contactor, and a fuse; the alternating current circuit breaker is arranged between the alternating current power grid and the charge-discharge module; the alternating current contactor is arranged between the alternating current meter and the alternating current charging gun; the direct current contactor is arranged between the charging and discharging module and the direct current charging gun; the fuse is arranged between the charging and discharging module and the direct current charging gun.
Specifically, the dc contactor and the ac contactor are respectively connected to the upper computer. The alternating current circuit breaker is used for controlling connection or disconnection of the alternating current power grid. The direct current contactor is used for controlling the on or off of the direct current charging gun. The alternating current contactor is used for controlling the on or off of an alternating current charging gun, and the fuse is used for controlling the open circuit of a direct current BUS BUS. The direct current contactor and the alternating current contactor can realize short circuit and overcurrent protection. Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (11)
1. The electric vehicle power battery detection equipment is characterized by comprising a cabinet body, and an upper computer, a middle computer, a lower computer and a direct current charging gun which are arranged in the cabinet body;
the upper computer, the middle computer and the lower computer are connected with each other;
the upper computer is used for receiving a battery performance detection instruction and sending the battery performance detection instruction to the middle computer and the lower computer, and is also used for setting battery performance detection related parameters and sending the battery performance detection related parameters to the lower computer, determining a battery performance detection result according to current value information and voltage value information sent by the lower computer and displaying the battery performance detection result;
the lower computer is respectively connected with the direct current charging gun and the alternating current power grid, and is used for executing a charging mode or a discharging mode according to the battery performance detection instruction and the battery performance detection related parameters and sending the acquired current value information and the acquired voltage value information to the upper computer;
the middle computer is in communication connection with a battery management system of the electric automobile through the direct-current charging gun, and is used for receiving battery data information sent by the battery management system and sending the battery data information to the upper computer;
the direct current charging gun is connected with a first charging seat of the electric automobile and used for transmitting a first direct current obtained by converting the lower computer to a power battery of the electric automobile and transmitting a second direct current released by the power battery to the lower computer.
2. The electric vehicle power battery detection device according to claim 1, wherein the lower computer comprises a microprocessor, a charge-discharge module, a voltage acquisition module and a current acquisition module, the microprocessor is connected with the charge-discharge module, the voltage acquisition module is respectively connected with the microprocessor and the charge-discharge module, and the current acquisition module is respectively connected with the microprocessor and the charge-discharge module;
the microprocessor is used for controlling the charge and discharge module to execute a charge mode or a discharge mode according to the battery performance detection instruction and the battery performance detection related parameters;
the voltage acquisition module is used for acquiring voltage value information of the output end of the charge and discharge module, and the current acquisition module is used for acquiring current value information of the output end of the charge and discharge module;
the microprocessor is used for sending the voltage value information and the current value information to the upper computer.
3. The electric vehicle power battery detection device according to claim 2, wherein the microprocessor comprises a first microprocessor and a second microprocessor, the charging and discharging module comprises a rectification and inversion module and a DC/DC conversion module,
in a charging mode, the first microprocessor controls the rectification inversion module to execute a rectification mode, and the second microprocessor controls the DC/DC conversion module to execute a voltage reduction mode;
in the discharging mode, the first microprocessor controls the rectification inversion module to execute an inversion mode, and the second microprocessor controls the DC/DC conversion module to execute a boosting mode.
4. The electric vehicle power battery detection apparatus according to claim 1, further comprising:
an AC charging gun and an AC electric meter,
the alternating current charging gun is respectively connected with the alternating current power grid, a second charging seat of the electric automobile, the central computer and the upper computer, and the alternating current charging gun is used for transmitting alternating current provided by the alternating current power grid to the power battery;
the alternating current meter is used for detecting first alternating current electric quantity input by the direct current side of the electric vehicle power battery detection equipment and second alternating current electric quantity input by the alternating current side.
5. The electric vehicle power battery detection apparatus according to claim 1, further comprising:
the insulation resistance detection device is respectively connected with the upper computer and the direct current charging gun;
the insulation resistance detection device is used for detecting insulation resistance on a direct current side.
6. The electric vehicle power battery detection device according to claim 1, further comprising an isolation transformer, wherein the isolation transformer is disposed between the ac power grid and the lower computer, and is configured to perform electrical isolation.
7. The electric vehicle power battery detection device according to claim 1, further comprising a switch, wherein the central computer and the lower computer are connected with the upper computer through the switch.
8. The electric vehicle power battery detection device according to claim 1, further comprising at least one of an ac circuit breaker, an ac contactor, a dc contactor, and a fuse;
the alternating current circuit breaker is arranged between the alternating current power grid and the lower computer;
the alternating current contactor is arranged between the alternating current meter and the alternating current charging gun;
the direct current contactor is arranged between the lower computer and the direct current charging gun;
the fuse is arranged between the lower computer and the direct current charging gun.
9. The electric vehicle power battery detection device of claim 1, wherein the upper computer is further configured to generate a battery performance detection report and output the battery performance detection report.
10. The electric vehicle power battery detection device as claimed in claim 1, wherein the central computer comprises an ARM.
11. The electric vehicle power battery detection device according to claim 1, wherein the battery performance detection instruction includes: at least one of a charging voltage allowable range value detection instruction, a direct current charging test current value detection instruction, a direct current charging test voltage value detection instruction, a battery internal resistance value DCIR detection instruction, a leakage current value detection instruction, a battery monomer maximum temperature value detection instruction, a battery monomer minimum temperature value detection instruction, a rapid test capacity retention value detection instruction, a direct current charging gun and first charging seat contact impedance value detection instruction, a charging and discharging conversion efficiency value detection instruction, a battery rated total capacity detection instruction, a static voltage precision value detection instruction and a dynamic current precision value detection instruction.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112310564A (en) * | 2020-10-26 | 2021-02-02 | 苏州万合电子有限公司 | Processing method of integrated module for battery |
| CN112462280A (en) * | 2020-11-20 | 2021-03-09 | 上海城建职业学院 | Battery formation and capacity grading system |
| CN112810492A (en) * | 2021-02-04 | 2021-05-18 | 深圳市瑞能时代科技有限公司 | Electric automobile assembled battery detecting system and battery test machine |
| CN113960481A (en) * | 2021-09-17 | 2022-01-21 | 珠海吉瓦科技有限公司 | Energy storage operation detection device, system, method and storage medium |
| CN113985288A (en) * | 2021-10-26 | 2022-01-28 | 广州小鹏汽车科技有限公司 | Method and device for reminding abnormality of component of vehicle battery, vehicle and storage medium |
| CN115648949A (en) * | 2022-12-28 | 2023-01-31 | 河北长征汽车制造有限公司 | Method for detecting DCIR (direct current infrared) of battery pack on line and electric automobile |
| WO2023050614A1 (en) * | 2021-09-30 | 2023-04-06 | 西安特来电领充新能源科技有限公司 | Charging detection method, apparatus and system of electric vehicle |
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- 2020-06-22 CN CN202010575914.6A patent/CN111722133A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310564A (en) * | 2020-10-26 | 2021-02-02 | 苏州万合电子有限公司 | Processing method of integrated module for battery |
| CN112462280A (en) * | 2020-11-20 | 2021-03-09 | 上海城建职业学院 | Battery formation and capacity grading system |
| CN112810492A (en) * | 2021-02-04 | 2021-05-18 | 深圳市瑞能时代科技有限公司 | Electric automobile assembled battery detecting system and battery test machine |
| CN113960481A (en) * | 2021-09-17 | 2022-01-21 | 珠海吉瓦科技有限公司 | Energy storage operation detection device, system, method and storage medium |
| WO2023050614A1 (en) * | 2021-09-30 | 2023-04-06 | 西安特来电领充新能源科技有限公司 | Charging detection method, apparatus and system of electric vehicle |
| CN113985288A (en) * | 2021-10-26 | 2022-01-28 | 广州小鹏汽车科技有限公司 | Method and device for reminding abnormality of component of vehicle battery, vehicle and storage medium |
| CN115648949A (en) * | 2022-12-28 | 2023-01-31 | 河北长征汽车制造有限公司 | Method for detecting DCIR (direct current infrared) of battery pack on line and electric automobile |
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