CN217901980U

CN217901980U - Finished product battery pack charging and discharging test system based on Internet of things

Info

Publication number: CN217901980U
Application number: CN202221719504.5U
Authority: CN
Inventors: 杨贤宗
Original assignee: Zhejiang Leiming New Energy Technology Co ltd
Current assignee: Zhejiang Leiming New Energy Technology Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-11-25
Anticipated expiration: 2032-06-27

Abstract

The utility model relates to a finished product group battery measurement test system based on thing networking, a serial communication port, include: the intelligent power supply comprises a battery pack, a bidirectional DC-DC module, an MCU, a WIFI module, a temperature and humidity sensor and an electric quantity compensation module which are electrically connected, wherein a battery in the battery pack is connected to the bidirectional DC-DC module through an electronic switch, the bidirectional DC-DC module is connected to the electric quantity compensation module and then connected to a national network, the MCU acquires data of the bidirectional DC-DC module, the electric quantity compensation module and the temperature and humidity sensor through a serial port information receiving and transmitting line, and the data of the bidirectional DC-DC module, the electric quantity compensation module and the temperature and humidity sensor are packaged and then transmitted to a terminal through the WIFI module to be displayed. The battery to be tested is charged through the battery to be tested, the battery to be tested is charged when the self detects the discharge capacity, the charging and discharging overlapping between the two groups of batteries is realized, the time utilization rate is improved, the high-efficiency energy conversion between different batteries is realized, and the comprehensive energy regeneration utilization rate is improved.

Description

Finished product battery pack charging and discharging test system based on Internet of things

Technical Field

The utility model relates to a battery technology field, more specifically say, relate to a finished product group battery charge-discharge test system based on thing networking.

Background

In the field of the storage battery industry, a battery capacity tester designed based on battery performance test is generally used for testing the charge and discharge electrical performance of the product performance of the battery, and the battery has a charge and discharge test function, wherein the discharge is to convert the electrical energy of the battery into heat energy and completely consume the heat energy. The improved energy feedback type battery capacity tester is characterized in that discharge is upgraded to a grid-connected inversion technology on the basis of a conventional battery capacity tester, and part of electric energy which is originally completely lost as heat energy is merged into a power grid for reuse.

Conventional battery capacity tester: the charging efficiency is low (85% -90%), and the discharging mode discharges through a resistance wire or a power tube, and the energy is completely lost in the form of heat, so that the device has no comprehensive energy regeneration and energy saving function and generates regeneration economic benefit, and huge waste of energy is caused.

Energy feedback type battery capacity tester: the charging efficiency is high (90% -95%), and partial discharged energy is merged into the power grid by using the grid-connected inversion technology in the discharging mode, and the actual grid-connected efficiency is (70% -93%) due to the difference of the grid-connected energy feedback technology in the market. Because the equipment cannot ensure that the electric energy for controlling the discharging grid connection of the equipment is consumed and utilized by hundreds of internal loads, the economic benefit maximization of the utilization of the regenerated electric energy cannot be realized.

When two kinds of above battery capacity tester carried out capacity performance to the battery and detects, a set of battery can only be connected to a detection channel on the equipment, every detection is a set of needs to reset the detection parameter, and the different detection parameters of model of battery need correspond the setting, it changes a set of mode to detect a set of people, so need artifical complementary strong influence production efficiency when detecting, it leads to the transformer power demand surge or the dilatation of external electric network to increase equipment quantity because of the production demand is limited, it is also high to the line load requirement of inside simultaneously, the continuous increase of input hardware cost.

From the perspective of the cost of the existing equipment, the conventional battery capacity tester has low cost, but does not save energy and has no economic benefit, and can be finally eliminated in the future. The energy feedback type battery capacity tester has high cost and requires 380V voltage access in the city network, so that the market popularization is limited.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that solve lies in that conventional battery capacity tester power consumption, economic benefits are not good, to the foretell defect of prior art, provide a finished product group battery measurement test system based on thing networking, include:

the intelligent power supply comprises a battery pack, a bidirectional DC-DC module, an MCU, a WIFI module, a temperature and humidity sensor and an electric quantity compensation module which are electrically connected, wherein a battery in the battery pack is connected to the bidirectional DC-DC module through an electronic switch, the bidirectional DC-DC module is connected to the electric quantity compensation module and then connected to a national network, the MCU acquires data of the bidirectional DC-DC module, the electric quantity compensation module and the temperature and humidity sensor through a serial port information receiving and sending line, and the data of the bidirectional DC-DC module, the electric quantity compensation module and the temperature and humidity sensor are packaged and then sent to a terminal through the WIFI module to be displayed.

Preferably, the electric quantity compensation module comprises a first switch, a grid-connected inverter and a first rectification charging module, the grid-connected inverter is provided with a DC end and an AC end, the first rectification charging module is provided with a DC end and an AC end, the first switch is respectively connected with the DC end of the grid-connected inverter and the DC end of the first rectification charging module, and the AC end of the grid-connected inverter and the AC end of the first rectification charging module are respectively connected with a national grid.

Preferably, the electric quantity compensation module comprises a second switch and a second rectification charging module, the second rectification charging module is provided with a DC terminal and an AC terminal, the second switch is connected with the DC terminal of the second rectification charging module, and the AC terminal of the second rectification charging module is connected with a national grid.

Preferably, the electric quantity compensation module comprises a third switch and a bidirectional converter module, the bidirectional converter module is provided with a DC end and an AC end, the third switch is connected with the DC end of the bidirectional converter module, and the AC end of the bidirectional converter module is connected with a national grid.

Preferably, the first rectifying and charging module includes that pin 4 of inductor T1 is connected to the drain of fet Q1, the gate of fet Q2, the source of fet Q3, and the gate of fet Q4, the source of fet Q1 is connected to the source of fet Q2 and grounded, the drain of fet Q2 is connected to pin 3 of inductor T1, the source of fet Q4, and the gate of fet Q3, the drain of fet Q4 is connected to the drain of fet Q3 and the anode of diode D1, and the cathode of diode D1 is connected to one end of capacitor C5.

Preferably, the second rectifying and charging module includes that pin 4 of inductor T1 is connected to the drain of fet Q1, the gate of fet Q2, the source of fet Q3, and the gate of fet Q4, the source of fet Q1 is connected to the source of fet Q2 and grounded, the drain of fet Q2 is connected to pin 3 of inductor T1, the source of fet Q4, and the gate of fet Q3, the drain of fet Q4 is connected to the drain of fet Q3 and the anode of diode D1, and the cathode of diode D1 is connected to one end of capacitor C5.

Preferably, the front stage of the bidirectional converter module is a DC/DC direct current converter, a half-bridge bidirectional Buck-Boost circuit is adopted to Boost the voltage of the battery to the voltage of a direct current bus, and the bidirectional transmission of direct current power is realized according to the closed-loop control of a direct current side current/power instruction; the rear stage is a DC/AC inversion rectifier, and a three-phase full bridge circuit and an LCL filter are adopted to invert the DC bus voltage into a three-phase AC power grid voltage.

Preferably, the bidirectional DC-DC module includes: the unidirectional DC-DC circuit is connected with the driving circuit and comprises a battery pack, a battery pack data acquisition circuit and a DC-DC control chip, wherein the battery pack data acquisition circuit acquires battery pack data, the DC-DC control chip controls the battery pack data acquisition circuit, and the battery pack data acquisition circuit sends a data acquisition instruction to the battery pack through a serial port or wirelessly and receives the instruction from the DC-DC control chip; the DC-DC control chip controls the driving circuit.

Preferably, the temperature and humidity sensor is used for detecting the temperature and the humidity of the battery and the equipment, and when the temperature and the humidity exceed the normal threshold range, the MCU gives an alarm and cuts off the power supply to the finished product battery pack charge and discharge test system based on the Internet of things.

Preferably, the WIFI module includes: the main control esp32 chip integrates a Wi-Fi chip and a Bluetooth 4.0 dual-mode chip, the MCU sends a serial port instruction to the wifi chip, the wifi chip forwards data to the server through an MQTT protocol, and the wifi chip receives the instruction from the server.

Implement the utility model discloses a finished product group battery measurement test system based on thing networking has following beneficial effect: the batteries are charged and discharged through the bidirectional DC-DC module, so that the discharging mode is optimized, the problem of single discharging mode is solved, the electric energy which is originally converted into heat and is lost is utilized to support the capacity test of other batteries, the problem of energy recycling is solved, and the energy utilization rate is improved;

the battery to be tested is charged through the battery to be tested, the battery to be tested is charged while the discharge capacity is detected, the charging and discharging overlapping between the two groups of batteries is realized, the time utilization rate is improved, the high-efficiency energy conversion between the batteries with different types and different specifications is realized, and the comprehensive energy regeneration utilization rate is improved;

the WIFI module uploads or receives data, the WIFI module is connected with a front end such as a webpage or a WeChat applet, the test system can be directly controlled or the working state of the test system can be checked, the detected data can be recorded and reserved at a network end, the detection data can be checked and restored conveniently, data loss is avoided, early warning can be realized in time, the function of the Internet of things system is optimized, and remote intelligent control, early warning and technical support can be realized;

the bidirectional DC-DC module can adjust voltage width, stabilize output voltage, and boost or reduce the voltage of batteries with different specifications to a uniform value set by a user, the batteries are charged and discharged integrally, the energy utilization rate is more than 96%, the total charging and discharging time consumption is only 2/3 of the original time consumption, namely, the production efficiency is improved by more than 30%, the comprehensive energy-saving efficiency is improved by 15%, and the equipment cost is reduced by 25%; the intelligent energy transfer between batteries of different models and different specifications can be realized, the main control of the product can be automatically adjusted, and the use is not influenced.

The temperature and humidity sensor is used for acquiring information, the WIFI module is used for sending sensor data and receiving a front-end control signal, the function of internet of things is realized, data are transmitted in two ways, real-time accurate monitoring is carried out on a battery test state on line, real-time test data and hardware state data of the test system such as the protection voltage and the current voltage of a battery are uploaded, the current and the current are protected, the working temperature and the working humidity of each module, the input voltage/current and the output voltage/current of the bidirectional DC-DC module and the like are realized, remote intelligent control is carried out on the test system, the large data technology support, fault and safety early warning and the like are realized, and the fire safety hidden danger caused by thermal runaway caused by battery faults and overload heat generation of the test system line can be greatly avoided in a long-time test process. Thereby improving the safety and reliability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts. The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic structural view of a preferred embodiment of the finished battery pack charging and discharging test system based on the internet of things;

fig. 2 is a schematic structural diagram of another preferred embodiment of the finished battery pack charge and discharge test system based on the internet of things;

fig. 3 is a schematic structural diagram of another preferred embodiment of the finished battery pack charge and discharge testing system based on the internet of things;

fig. 4 is a schematic circuit diagram of a first rectifying charging module or a second rectifying charging module in the present application;

FIG. 5 is a schematic circuit diagram of a bi-directional DC-DC module of the present application;

fig. 6 is a schematic diagram of a bidirectional converter circuit in the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Example one

Please refer to fig. 1, which is a schematic structural diagram of a preferred embodiment of the finished battery pack charging and discharging test system based on the internet of things. As shown in fig. 1, the utility model discloses in the finished product group battery measurement test system based on thing networking that the first embodiment provided, at least, include, group battery through electrical connection, two-way DC-DC module, MCU, the WIFI module, temperature and humidity sensor, electric quantity compensation module, battery in the group battery is connected to two-way DC-DC module through electronic switch, two-way DC-DC module is connected to electric quantity compensation module and inserts the national network again, MCU acquires two-way DC-DC module through serial ports information transceiver line, electric quantity compensation module, temperature and humidity sensor's data, again with two-way DC-DC module, electric quantity compensation module, temperature and humidity sensor's data packing back, send the terminal to and show by the WIFI module through serial ports information transceiver line.

The electric quantity of each battery is firstly collected into a first battery through the bidirectional DC-DC module, the electric quantity compensation module automatically inverts redundant electric quantity or supplements and charges the battery, the electric quantity is controlled in a saturated state, then the first battery discharges other batteries through the bidirectional DC-DC module, the process preferentially discharges to a second battery until the electric quantity of the second battery is empty, the discharged electric quantity of the first battery is recorded at the moment, namely the discharge capacity of the first battery, all battery capacity detection is completed through secondary circulation, finally, the capacity of each battery is adjusted to be 20% -30% of the total capacity, and then the testing system automatically sleeps.

In this embodiment, the electric quantity compensation module includes a first switch, a grid-connected inverter, and a first rectifying and charging module, the grid-connected inverter is provided with a DC terminal and an AC terminal, the first rectifying and charging module is provided with a DC terminal and an AC terminal, the first switch is respectively connected to the DC terminal of the grid-connected inverter and the DC terminal of the first rectifying and charging module, and the AC terminal of the grid-connected inverter and the AC terminal of the first rectifying and charging module are respectively connected to a national grid.

When the MCU detects that the electric quantity of the battery to be detected is not full and the electric quantities of other batteries are insufficient, the first switch is controlled to be opened, the first rectifying and charging module is connected to the circuit, and the battery is charged to saturation after alternating current of a state network is rectified into direct current; when the tested battery discharges other batteries, if the other batteries are completely saturated, the MCU controls the first switch to be switched on, the grid-connected inverter is connected into the circuit, the excess electricity is inverted into alternating current, and the alternating current is connected into a power grid.

Fig. 4 is a circuit schematic diagram of a first rectifying and charging module or a first rectifying and charging module in the present application. The first rectifying charging module comprises: a pin 4 of the inductance coil T1 is connected with a drain electrode of the field-effect tube Q1, a grid electrode of the field-effect tube Q2, a source electrode of the field-effect tube Q3 and a grid electrode of the field-effect tube Q4 respectively, a source electrode of the field-effect tube Q1 is connected with a source electrode of the field-effect tube Q2 and is grounded, a drain electrode of the field-effect tube Q2 is connected with the pin 3 of the inductance coil T1, the source electrode of the field-effect tube Q4 and the grid electrode of the field-effect tube Q3 respectively, a drain electrode of the field-effect tube Q4 is connected with a drain electrode of the field-effect tube Q3 and an anode of the diode D1 respectively, and a cathode of the diode D1 is connected with one end of the capacitor C5.

According to the direction marked by the graphic L2, when the voltage is in the positive half cycle, the G pole (grid) level of the field effect transistor Q3 is low, the S pole (source) is connected with the output, the voltage of the S pole (source) is equal to the output voltage, the transistor is a P channel, and Vs is more than Vg; the fet Q3 is thus turned on. At this time, the G-pole (gate) level of the field effect transistor Q2 is about the output level, the S-pole (source) thereof is grounded (power supply is negative), the voltage applied to Vgs is positive, and the field effect transistor Q2 is turned on because the field effect transistor Q2 is an N-channel. Similarly, in the negative half cycle, the field effect transistor Q1 and the field effect transistor Q4 are conducted, so as to achieve the purpose of current rectification.

Fig. 5 is a circuit schematic diagram of a bi-directional DC-DC module in the present application. As shown in fig. 5, the bidirectional DC-DC module includes: the unidirectional DC-DC circuit is connected with the driving circuit and comprises a battery pack, a battery pack data acquisition circuit and a DC-DC control chip, wherein the battery pack data acquisition circuit acquires battery pack data, the DC-DC control chip controls the battery pack data acquisition circuit, and the battery pack data acquisition circuit sends a data acquisition instruction to the battery pack through a serial port or wirelessly and receives an instruction from the DC-DC control chip; the DC-DC control chip controls the driving circuit.

Through the switching control of the MOS, the bidirectional conversion of DC-DC is realized. The bidirectional DC-DC module in this application functions as: the output voltage is stabilized, so that the charging and discharging among the batteries can be stably carried out; during charging and discharging, the voltage width of the input/output voltage of the grid-connected inverter and the rectifying and charging module is adjusted, so that the grid-connected inverter and the battery can work safely. The bidirectional purpose is that the requirement for connecting the input/output end is reduced when the circuit is connected, the circuit is controlled by software, and the operation safety of a user is improved.

The DC-DC control chip may be, but is not limited to, LT03780. The working principle of the bidirectional DC-DC module is as follows: the circuit is provided with three modes in work: buck region (input voltage > output voltage), boost-buck region (input voltage ≈ output voltage), boost region (input voltage < output voltage).

Buck region (input voltage > output voltage): in this mode, switch S4 is always on and switch S3 is always off. At the beginning of each cycle, the synchronous switch S2 is first turned on. When S2 is turned on, the inductor continues to be sensed. After the sense inductor current falls below the reference voltage, the synchronous switch S2 is turned off and the switch S1 is turned on for the remainder of the cycle. The switches S1 and S2 are alternately turned on like a typical synchronous buck regulator.

Boost-buck region (input voltage ≈ output voltage): when the input voltage is close to the output voltage, the driving circuit is in a buck-boost mode. In each cycle, if the turning on of the switches S2 and S4 is taken as a start, the switches S1 and S3 are subsequently turned on. Finally, switches S1 and S4 are on for the remaining time. Switches S2 and S4 are subsequently turned on if the turning on of switches S1 and S3 is taken as a start. Finally, switches S1 and S4 are on for the remaining time.

Boost region (input voltage < output voltage): in boost mode, switch S1 is always on and synchronous switch S2 is always off. In each cycle, switch S3 is first turned on, and inductor current continues to be sensed while synchronous switch S3 is turned on. After the sense inductor current rises above the reference voltage, switch S3 is turned off and synchronous switch S4 is turned on for the remainder of the cycle. Switches S3 and S4 will be turned on alternately as a typical synchronous boost regulator.

Fig. 6 is a schematic diagram of a bidirectional converter circuit in the present application. As shown in fig. 6, the pre-stage of the bidirectional converter module is a DC/DC direct-current converter, a half-bridge bidirectional Buck-Boost circuit is used to Boost the battery voltage to the DC bus voltage, and the bidirectional transmission of the DC power is realized according to the closed-loop control of the current/power instruction at the DC side; the rear stage is a DC/AC inversion rectifier, and a three-phase full bridge circuit and an LCL filter are adopted to invert the DC bus voltage into a three-phase AC power grid voltage. Since the LCL filter attenuates at a 60dB/dec slope at or above the resonant frequency, high-frequency harmonics in the grid-connected current can be suppressed well. The post-stage converter adopts a double closed-loop control mode of a voltage outer loop and a current inner loop. The voltage outer loop controller generates a reference current signal by stabilizing the voltage of the direct current bus, and then realizes active and reactive power regulation on the alternating current side through the current inner loop controller so as to improve the dynamic performance of the system and realize current-limiting protection. The pre-stage converter is responsible for adjusting the charging and discharging current of the PCS direct current side and is connected with the post-stage grid-connected converter only through a direct current bus. In order to reduce direct current ripple, the front-stage DC/DC converter can adopt a multiple carrier phase-shifting method to carry out multiple groups of parallel connection.

The temperature and humidity sensor is used for detecting the temperature and the humidity of the battery and the equipment, and when the temperature and the humidity exceed the normal threshold range, the MCU gives an alarm and cuts off the power supply to the finished product battery pack charge and discharge test system based on the Internet of things. The temperature and humidity sensor may be, but is not limited to, DHT11 or the like in this embodiment.

The WIFI module includes: the master control esp32 chip integrates a Wi-Fi chip and a Bluetooth 4.0 dual-mode chip, the MCU sends a serial port instruction to the wifi chip, the wifi chip forwards data to the server through an MQTT protocol, and the wifi chip receives the instruction from the server.

In the embodiment, the discharge mode of the test system adopts a grid-connected inversion mode, and the batteries are charged and discharged through the bidirectional DC-DC module, so that the discharge mode is optimized, the problem of single discharge mode is solved, the electric energy which is originally converted into heat to be lost is utilized to support the capacity test of other batteries, the problem of energy recycling is solved, and the energy utilization rate is improved;

the battery to be tested is charged through the battery to be tested, the battery to be tested is charged while the discharge capacity is detected, the charging and discharging overlapping between the two groups of batteries is realized, the time utilization rate is improved, the high-efficiency energy conversion between the batteries with different types and specifications is realized, and the comprehensive energy regeneration utilization rate is improved;

data are uploaded or received through the WIFI module, and the WIFI module is connected with a front end such as a webpage or a WeChat applet, so that the test system can be directly controlled or the working state of the test system can be checked, early warning can be timely realized, the function of the Internet of things system is optimized, and remote intelligent control, early warning and technical support can be realized;

Information is acquired through a temperature and humidity sensor, a WIFI module sends sensor data and receives a front end control signal, the function of the Internet of things is realized, data are transmitted in two ways, the battery test state is accurately monitored in real time on line, real-time test data and hardware state data of the test system such as the protection voltage and the current voltage of a battery are uploaded, the protection current and the current are protected, the working temperature and the humidity of each module, the input voltage/current and the output voltage/current of a bidirectional DC-DC module and the like are realized, intelligent control is remotely carried out on the test system, the technical support of big data is realized, faults and safety early warning and the like are realized, and the problems of fire safety hidden dangers caused by out-of-control heat caused by battery faults and overload heat generation of a line of the test system can be greatly avoided in a long-time test process. Thereby improving the safety and reliability.

Example two

Fig. 2 is the utility model discloses finished product group battery charge-discharge test system's another preferred embodiment structure schematic diagram based on thing networking. As shown in fig. 2, the difference from the embodiment is that the electric quantity compensation module includes a second switch and a second rectifying and charging module, the second rectifying and charging module is provided with a DC terminal and an AC terminal, the second switch is connected to the DC terminal of the second rectifying and charging module, and the AC terminal of the second rectifying and charging module is connected to the national grid.

When the MCU detects that the electric quantity of the battery to be detected is not full and the electric quantities of other batteries are insufficient, the second switch is controlled to be opened, the second rectifying and charging module is connected into the circuit, and the battery is charged to saturation after the alternating current of the state network is rectified into direct current.

Fig. 4 is a circuit diagram of the first rectifying charging module or the second rectifying charging module in the present application. In this embodiment, the second rectifying and charging module includes: the pin 4 of the inductance coil T1 is respectively connected with the drain electrode of the field effect transistor Q1, the grid electrode of the field effect transistor Q2, the source electrode of the field effect transistor Q3 and the grid electrode of the field effect transistor Q4, the source electrode of the field effect transistor Q1 is connected with the source electrode of the field effect transistor Q2 and is grounded, the drain electrode of the field effect transistor Q2 is respectively connected with the pin 3 of the inductance coil T1, the source electrode of the field effect transistor Q4 and the grid electrode of the field effect transistor Q3, the drain electrode of the field effect transistor Q4 is respectively connected with the drain electrode of the field effect transistor Q3 and the anode of the diode D1, and the cathode of the diode D1 is connected with one end of the capacitor C5.

The embodiment adopts a mode of charging the freely selected energy storage batteries, so that the cost is saved, a new energy recovery mode is provided, the energy recovery efficiency can reach more than 95%, the batteries are charged and discharged through the bidirectional DC-DC module, the discharging mode is optimized, the problem of single discharging mode is solved, the electric energy which is originally converted into heat to be lost is utilized, the capacity test of other batteries is supported, the problem of energy regeneration and utilization is solved, and the energy utilization rate is improved;

data are uploaded or received through the WIFI module, and the WIFI module is connected with a front end such as a webpage or a WeChat applet and the like, so that the test system can be directly controlled or the working state of the test system can be checked, early warning can be timely realized, the function of the Internet of things system is optimized, and remote intelligent control, early warning and technical support can be realized;

the bidirectional DC-DC module can adjust voltage width, stabilize output voltage, and boost or reduce the voltage of batteries with different specifications to a uniform value set by a user, the batteries are charged and discharged integrally, the energy utilization rate is more than 96%, the total charging and discharging time consumption is only 2/3 of the original time consumption, namely, the production efficiency is improved by more than 30%, the comprehensive energy-saving efficiency is improved by 15%, and the equipment cost is reduced by 25%; the intelligent energy transfer between batteries of different types and specifications can be realized, the product master control can be automatically adjusted, and the use is not influenced.

EXAMPLE III

Fig. 3 is a schematic structural diagram of another preferred embodiment of the finished battery pack charging and discharging test system based on the internet of things. As shown in fig. 3, different from the first embodiment or the second embodiment, the electric quantity compensation module includes a third switch and a bidirectional converter module, the bidirectional converter module is provided with a DC terminal and an AC terminal, the third switch is connected to the DC terminal of the bidirectional converter module, and the AC terminal of the bidirectional converter module is connected to a national grid.

When the MCU detects that the electric quantity of the battery to be detected is not full and the electric quantities of other batteries are insufficient, the third switch is controlled to be opened, the bidirectional converter module is connected into the circuit, and the battery is charged to saturation after alternating current of a national grid is rectified into direct current; when the tested battery discharges other batteries, if the other batteries are completely saturated, the MCU controls the third switch to be opened, the bidirectional converter module is connected into the circuit, the direct current is inverted into alternating current, and the alternating current is connected into a power grid.

The embodiment integrates the rectification charging module and the grid-connected inverter, so that the unification of the power of the rectification charging module and the power of the grid-connected inverter is convenient to realize, the connection of circuits is reduced, the production cost is reduced under the condition that the original function is not changed, the active and reactive regulation of the alternating current side is realized through the current inner ring controller, the dynamic performance of the test system is improved, and the current-limiting protection is realized. And the direct current ripple can be effectively reduced by adopting a multiple carrier phase shifting method to carry out multiple groups of parallel connection. And the LCL filter can well restrain high-frequency harmonic waves in grid-connected current.

The embodiment of the utility model provides a, two or three finished product group battery charge-discharge test system work flows based on thing networking of embodiment are:

will the utility model discloses finished product group battery charge-discharge test system based on thing networking is connected with the commercial power earlier, carries out self-checking earlier, including the networking state, and trouble-free then display screen display shows normally, if show trouble prejudgement result information.

When the test system is started normally, the positive and negative electrodes of each battery are connected with the positive and negative electrodes of each channel of the test system, the test system can also be provided with a reverse connection prevention function, if the reverse connection occurs, the test system prompts reverse connection early warning information through a display screen, and when the positive and negative electrodes are in one-to-one correspondence, the working parameter setting of each channel can be entered.

And setting parameters such as charge-discharge protection voltage, current, time, capacity, charge-discharge cycle steps and the like according to different specifications of various batteries. After the set parameters are confirmed to be correct, the test system can be started.

The test system can realize the performance test data required by each group of batteries according to the parameters preset by the user and the charging point cycle steps. The specific process is that batteries of a plurality of channels of the test system are connected, energy conversion of the batteries of two channels is realized through a bidirectional DC-DC module and a bus type switch control circuit, and energy transfer is sequentially carried out from a large-energy battery to a small-energy battery.

The bidirectional DC-DC module firstly screens out the first battery, receives the electric quantity of other batteries to be tested, and then the electric quantity compensation module compensates the electric quantity of the first battery to saturation by using a power grid or inverts the excessive part of electric quantity and then merges the excessive part of electric quantity into the power grid. And then the saturated battery or the next battery to be tested is charged, the battery is discharged, the battery capacity of the first selected battery can be tested when the electric quantity of the battery is discharged, and the bidirectional DC-DC module supplies power stably in the process, so that the mutual charging and discharging among batteries of different models can be met. And sequentially circulating until the last battery to be tested discharges other batteries until the power of the battery is discharged, and finally, adjusting the power of all the batteries to be 20% of the capacity of the batteries by the power compensation module. The whole-process control of the Internet of things and the control system is used in the process, the charge and discharge capacity, the input/output voltage, the input/output current, the protection voltage, the temperature, the humidity and the charge and discharge voltage parameters of the single-string battery cell of the battery are collected and uploaded to the cloud server through WIFI, the test system can be controlled through the cloud server, and the data are transmitted in a two-way mode.

The utility model discloses a design of above embodiment, its beneficial effect is: the discharging mode is optimized, the problem of single discharging mode is solved, and the electric energy which is originally converted into heat and lost is utilized to support the capacity test of other batteries; the problem of energy recycling is solved, and the energy utilization rate is improved; the charging and discharging overlapping between the two groups of batteries is realized, and the time utilization rate is improved; high-efficiency energy conversion among batteries with different types and specifications is realized, and the comprehensive regeneration utilization rate of energy is improved; the functions of the Internet of things system are optimized, and remote intelligent control, early warning and technical support are realized; the battery is charged and discharged integrally, the energy utilization rate is more than 96%, the total charging and discharging time consumption is only 2/3 of the original time consumption, namely the production efficiency is improved by more than 30%, the comprehensive energy-saving efficiency is improved by 15%, and the equipment cost is reduced by 25%; the intelligent energy transfer between batteries of different models and different specifications can be realized, the main control of the product can be automatically adjusted, and the use is not influenced.

The intelligent control and big data technology support system realizes the functions of the Internet of things and the bidirectional data transmission, accurately monitors the battery test state in real time on line, uploads the real-time test data and the hardware state data of the test system, and remotely carries out intelligent control, big data technology support, fault and safety early warning on the test system. The potential fire safety hazard caused by thermal runaway caused by battery faults and overload heat of the test system line in a long-time test process can be greatly avoided. Thereby improving the safety and reliability.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. Furthermore, to adapt to the particular situation of the technology of the present invention, it is possible to make numerous modifications to the present invention without departing from its scope of protection. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides a finished product group battery measurement test system based on thing networking which characterized in that includes:

2. The finished battery pack charging and discharging test system based on the internet of things as claimed in claim 1, wherein the electric quantity compensation module comprises a first switch, a grid-connected inverter and a first rectification charging module, the grid-connected inverter is provided with a DC end and an AC end, the first rectification charging module is provided with a DC end and an AC end, the first switch is respectively connected with the DC end of the grid-connected inverter and the DC end of the first rectification charging module, and the AC end of the grid-connected inverter and the AC end of the first rectification charging module are respectively connected with the national grid.

3. The finished battery pack charging and discharging test system based on the internet of things as claimed in claim 1, wherein the electric quantity compensation module comprises a second switch and a second rectifying and charging module, the second rectifying and charging module is provided with a DC end and an AC end, the second switch is connected with the DC end of the second rectifying and charging module, and the AC end of the second rectifying and charging module is connected with a national grid.

4. The finished battery pack charging and discharging test system based on the internet of things as claimed in claim 1, wherein the electric quantity compensation module comprises a third switch and a bidirectional converter module, the bidirectional converter module is provided with a DC end and an AC end, the third switch is connected with the DC end of the bidirectional converter module, and the AC end of the bidirectional converter module is connected with a national grid.

5. The finished battery pack charging and discharging test system based on the internet of things as claimed in claim 2, wherein the first rectifying and charging module comprises:

the pin 4 of the inductance coil T1 is respectively connected with the drain electrode of the field effect transistor Q1, the grid electrode of the field effect transistor Q2, the source electrode of the field effect transistor Q3 and the grid electrode of the field effect transistor Q4, the source electrode of the field effect transistor Q1 is connected with the source electrode of the field effect transistor Q2 and is grounded, the drain electrode of the field effect transistor Q2 is respectively connected with the pin 3 of the inductance coil T1, the source electrode of the field effect transistor Q4 and the grid electrode of the field effect transistor Q3, the drain electrode of the field effect transistor Q4 is respectively connected with the drain electrode of the field effect transistor Q3 and the anode of the diode D1, and the cathode of the diode D1 is connected with one end of the capacitor C5.

6. The finished battery pack charging and discharging test system based on the internet of things as claimed in claim 3, wherein the second rectifying and charging module comprises:

7. The finished battery pack charging and discharging test system based on the Internet of things according to claim 4, wherein a DC/DC direct current converter is arranged at the front stage of the bidirectional converter module, a half-bridge bidirectional Buck-Boost circuit is adopted to Boost the battery voltage to the direct current bus voltage, and bidirectional transmission of direct current power is realized according to closed-loop control of direct current side current/power instructions; the rear stage is a DC/AC inversion rectifier, and a three-phase full bridge circuit and an LCL filter are adopted to invert the DC bus voltage into a three-phase AC power grid voltage.

8. The internet of things based finished battery pack charging and discharging test system according to any one of claims 1 to 7, wherein the bidirectional DC-DC module comprises:

the unidirectional DC-DC circuit is connected with the driving circuit and comprises a battery pack, a battery pack data acquisition circuit and a DC-DC control chip, wherein the battery pack data acquisition circuit acquires battery pack data, the DC-DC control chip controls the battery pack data acquisition circuit, and the battery pack data acquisition circuit sends a data acquisition instruction to the battery pack through a serial port or wirelessly and receives the instruction from the DC-DC control chip; the DC-DC control chip controls the driving circuit.

9. The finished battery pack charge-discharge testing system based on the internet of things as claimed in claim 8, wherein the temperature and humidity sensor is used for detecting the temperature and humidity of the battery and the equipment, and when the temperature and humidity exceed normal threshold ranges, the MCU gives an alarm and cuts off power supply to the finished battery pack charge-discharge testing system based on the internet of things.

10. The finished battery pack charge-discharge testing system based on the internet of things of claim 8, wherein the WIFI module comprises:

the master control esp32 chip integrates a Wi-Fi chip and a Bluetooth 4.0 dual-mode chip, the MCU sends a serial port instruction to the wifi chip, the wifi chip forwards data to the server through an MQTT protocol, and the wifi chip receives the instruction from the server.