WO2021134829A1

WO2021134829A1 - Battery testing system

Info

Publication number: WO2021134829A1
Application number: PCT/CN2020/071876
Authority: WO
Inventors: 王海涛; 邓波; 罗勇; 孟超; 刘卫强
Original assignee: 深圳市普兰德储能技术有限公司
Priority date: 2019-12-31
Filing date: 2020-01-14
Publication date: 2021-07-08
Also published as: CN111175667A; AU2020202736A1; SG11202003647SA; JP2022519956A

Abstract

A battery testing system. The system comprises: a data acquisition module (110), electrically connected to a battery of a vehicle chassis and configured to acquire state information of each single cell in a battery system of the vehicle chassis and current information of the battery system, wherein the state information comprises voltage information and temperature information; a communication conversion module (120), communicatively connected to the data acquisition module (110) and configured to transmit the state information and the current information acquired by the data acquisition module (110); and a main control module (130), communicatively connected to the communication conversion module (120), and configured to receive the state information of each single cell in the battery system of the vehicle chassis transmitted by the communication conversion module (120), analyze the information and determine usage condition of the battery system of the vehicle chassis according to a preset determining strategy. The system can be directly connected to the battery of the vehicle chassis to analyze the capacity, the voltage difference, the battery cell operation consistency and the like of the battery, modular design of the system is adopted, the integration level is high, the costs are saved, the space is saved, and the operation is convenient.

Description

Battery test system

Technical field

This application relates to the field of battery technology, and in particular to a battery testing system.

Background technique

In recent years, with the rapid development of new energy vehicles, the echelon utilization of power batteries has become a hot topic, because as time goes by, the batteries of electric vehicles will be retired from vehicles after a certain number of years or times of use. However, due to the different usage conditions of car users, there are many uncertainties in the replacement of the battery. Some of the batteries in the chassis may only be damaged by a few cells and cause the entire chassis to be unusable, and some may be one or two. The difference between the battery core and other batteries is quite large, resulting in the power of the entire chassis is not enough to support the corresponding mileage. Therefore, it is particularly important to conduct a comprehensive analysis of the decommissioned power battery.

technical problem

During the use of existing electric vehicles, the Battery Management System (BMS) is designed by the battery manufacturers themselves, and there are technical barriers. In addition to the authorization of the battery manufacturer, it is basically difficult to detect the information of the battery in the chassis by other means. Existing battery testing cabinet testing requires a lot of space and complicated wiring, or the battery of the chassis needs to be disassembled into battery cells or a battery module composed of several cells for testing, which has great impact on the entire chassis test. difficult.

It can be seen that how to design a test system that can quickly detect chassis battery information has become an urgent technical problem to be solved.

Technical solutions

Based on this, it is necessary to provide a battery test system in response to the above-mentioned problems.

A battery testing system, including:

The data collection module is electrically connected to the battery of the car chassis, and is used to collect the status information of each single cell in the battery system of the car chassis and the current information of the battery system; the status information includes voltage information and temperature information;

A communication conversion module, which is in communication connection with the data collection module, and is used to transmit the status information and the battery system current information collected by the data collection module;

The main control module is communicatively connected with the communication conversion module, and is used to receive the status information of each single cell in the battery system of the automobile chassis and the current information of the battery system transmitted by the communication conversion module. The status information and the current information of the battery system are analyzed, and the usage of the battery system of the automobile chassis is judged according to a preset judgment strategy.

Optionally, in one of the embodiments, it further includes a power conversion module, the power conversion module is communicatively connected to the communication conversion module, the power conversion module is electrically connected to the battery of the vehicle chassis and the power grid, the The power conversion module is configured to mutually convert the AC power output from the power grid and the DC power output from the battery;

The power conversion module is further configured to receive a control instruction sent by the main control module through the communication module, and change the magnitude of the converted power and the direction of power conversion according to the control instruction.

Optionally, in one of the embodiments, it further includes a battery control module that is electrically connected to the battery of the vehicle chassis, the power conversion module, and the data acquisition module, and the battery control module is used to control the The connection between the battery of the vehicle chassis and the power conversion module is on and off, and is used to cut off the connection between the battery and the outside when the battery is in an abnormal state.

Optionally, in one of the embodiments, the power conversion module includes an AC-DC converter, and the AC-DC converter is used to rectify the AC power output from the power grid into a DC power supply to charge the battery of the vehicle chassis , Fully charged to SOC100%; also used to invert the DC power output from the battery of the vehicle chassis to AC power to discharge the power grid to SOC 0%.

Optionally, in one of the embodiments, the data collection module includes a data collector master control and a data collector slave control, and the data collector slave control is electrically connected to the battery of the vehicle chassis for collecting The state information of each single cell in the battery of the automobile chassis and the current information of the battery system;

The master control of the data collector is electrically connected to the slave control and battery control module of the data collector, and is used to send the status information collected by the slave control of the data collector to the master control module, and is also used to When the battery is abnormal, the battery control module is controlled to cut off the connection between the battery of the vehicle chassis and the power conversion module.

Optionally, in one of the embodiments, after disconnecting the data acquisition connector and the main power line of the primary battery module, the data collector is connected to each of the batteries of the vehicle chassis through a sampling line. And calculate the state information of each single cell corresponding to the sampling line and the current information of the battery system according to the collected data of the sampling line.

Optionally, in one of the embodiments, the main control module is further configured to calculate the battery system of the automobile chassis according to the state information of each single cell in the automobile chassis and the current information of the battery system The capacity, charge and discharge temperature, charge and discharge efficiency and the internal resistance of each single cell;

Calculate the battery of each single cell according to the status information, the current information of the battery system and the capacity of the battery system of the car chassis, charge and discharge temperature, charge and discharge efficiency, and the internal resistance of each single cell Health

Judging the usage status of the battery of the automobile chassis according to the battery health of each single cell.

Optionally, in one of the embodiments, the main control module judging the usage of the battery of the vehicle chassis according to the battery health of each single cell includes:

When the battery health of each single cell is greater than or equal to the first threshold, determining that the battery of the vehicle chassis is in a normal use state;

When the battery health of a single cell is less than the second threshold, it is determined that the corresponding single cell is in a state to be repaired;

When there are more than a preset number of single cells whose battery health is less than the first threshold, it is determined that the battery of the vehicle chassis is in a state to be replaced.

Optionally, in one of the embodiments, it further includes a display module which is electrically connected to the main control module and is used to display the status information of each individual battery cell in the vehicle chassis, the The current information of the battery system and the usage of the battery of the vehicle chassis.

Optionally, in one of the embodiments, the communication conversion module includes a communication converter for connecting with the main control module through a network cable, connecting with the data acquisition module through a CAN bus or a 485 bus, and connecting with the main control module through a CAN bus or a 485 bus. The power conversion module is connected via the 485 bus.

Beneficial effect

Implementing the embodiments of this application will have the following beneficial effects:

The above battery test system is electrically connected to the battery of the vehicle chassis through the data acquisition module, and is used to collect the status information of each single cell in the battery of the vehicle chassis; and transmit all the information collected by the data acquisition module through the communication conversion module. The state information; the state information of each cell in the automobile chassis and the current information of the battery system transmitted by the communication conversion module are received by the main control module, and the information on the state information and the battery system The current information is analyzed, and the usage of the battery of the vehicle chassis is judged according to a preset judgment strategy. Through the above system, the battery of the car chassis can be directly connected to complete the analysis of the battery capacity, pressure difference, and battery cell operation consistency. The modular design of the system, high integration, save costs, save space, and facilitate operation.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

among them:

Fig. 1 is a structural block diagram of a battery test system in an embodiment of the application;

FIG. 2 is a structural block diagram of a battery test system in another embodiment of the present application;

Fig. 3 is a structural block diagram of a battery test system in another embodiment of the present application.

Embodiments of the present invention

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

In order to make the purpose, technical solutions, and advantages of this application clearer and clearer, the following further describes the application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

As shown in Fig. 1, in one embodiment, a battery test system is proposed. The battery test system can be used to test the battery of a car chassis. The car can be an electric car or a hybrid car. It can be a battery or a fuel cell, where the battery is suitable for pure electric vehicles, including lead-acid batteries, nickel-hydrogen batteries, sodium-sulfur batteries, secondary lithium batteries, air batteries, etc.; fuel cells are dedicated to fuel cell electric vehicles, including alkaline fuels Batteries, phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells, proton exchange membrane fuel cells, direct methanol fuel cells, etc. The battery can be used as the power source of the car drive system. The battery test system provided in this embodiment can quickly detect the battery of the automobile chassis, and the system has a high degree of integration, which can save costs, save space, and facilitate operation. As shown in FIG. 1, it is a structural block diagram of a battery test system in an embodiment. The system includes a data acquisition module 110, a communication conversion module 120, and a main control module 130. The data acquisition module 110 is electrically connected to the battery of the vehicle chassis, and the communication conversion The module 120 is in communication connection with the data acquisition module 110, and the main control module 130 is in communication connection with the communication conversion module 120.

The data collection module 110 is used to collect the status information of each single cell in the battery system of the automobile chassis and the current information of the battery system; the status information includes voltage information and temperature information. Specifically, the data collection module 110 can establish a connection with each single cell in the battery of the car chassis, for example, connect to each single cell through a sampling line; thereby collecting the status information of each single cell, such as collecting Data such as voltage and temperature of each single cell. Further, the data collection module 110 transmits the collected data to the main control module 130 through the communication conversion module 120, so that the main control module 130 can analyze the collected data.

The communication conversion module 120 is in communication connection with the data acquisition module 110, and is used to transmit the state information of the vehicle chassis battery collected by the data acquisition module 120 and the current information of the battery system. Specifically, the communication conversion module 120 is used to cooperate with the data transmission between the data acquisition module 110 and the main control module 130, and can send the state information of the vehicle chassis battery collected by the data acquisition module 120 to the main control module 130 for the main control module 130 analyzes the collected data, and may also transmit the control instruction sent by the main control module 130 to the data acquisition module 110 to control the work of the data acquisition module 110. For example, the communication conversion module 120 may be a communication interface converter that can realize data conversion between different communication interfaces, such as a communication converter, a serial port converter, and the like.

The main control module 130 is used to receive the status information of each single cell in the battery system of the automobile chassis and the current information of the battery system transmitted by the communication conversion module 120, and to compare the status information and the current information of the battery system. Analyze, and judge the usage of the battery of the vehicle chassis according to a preset judgment strategy. Specifically, the main control module 130 may receive data such as the voltage and temperature of each cell in the car chassis, calculate the battery health (State Of Health, SOH) of each cell according to the collected data, and calculate the state of health (SOH) of each cell according to the collected data. The battery health of each single battery cell judges the usage of the battery of the car chassis, so as to realize the rapid test of the battery of the car chassis.

The above-mentioned battery test system can be directly connected to the battery of the car chassis to complete the analysis of battery capacity, pressure difference, and battery cell operation consistency. The system's modular design, high integration, save costs, save space, and facilitate operation.

In one embodiment, as shown in FIG. 2, it is a structural block diagram of a battery test system in another embodiment. The battery test system further includes a power conversion module 230. The power conversion module 230 is communicatively connected with the communication conversion module 220, and the power conversion The module 230 is electrically connected to the battery of the vehicle chassis and the power grid, and the power conversion module 230 is used to mutually convert the AC power output from the power grid and the DC power output from the battery. The power conversion module 230 is further configured to receive a control instruction sent by the main control module 240 through the communication module 220, and change the magnitude of the converted power and the direction of power conversion according to the control instruction. Wherein, the power conversion module 230 can complete the conversion between AC power and DC power, for example, rectifying the AC power to a DC power, or inverting the DC power to an AC power. The power grid can be understood as a whole composed of various voltage substations and transmission and distribution lines in the power system, such as the 380V AC mains provided by the National Grid through the industrial park.

In one embodiment, the power conversion module includes an AC-DC converter. The AC-DC converter can be used to rectify the AC power output from the grid into a DC power supply to charge the battery of the car chassis, and it can also be used to charge the battery of the car chassis to 100% SOC; The DC power source output by the battery of the vehicle chassis is inverted into an AC power source to discharge the power grid to SOC 0%. Specifically, during charging, the AC power supply is rectified to a DC power supply above 0.5C, and when discharging, the output DC power supply is inverted to a 0.75C AC power supply. The AC-DC converter can pass thermoelectric conversion, electric system, and electrostatic AC/DC (AC/DC) conversion using methods such as system, electronic system, etc.

Use the power grid to charge the battery system above 0.5C, and then discharge to 0.75C after being fully charged to SOC 100%, and discharge to SOC 0% cut-off; carry out a complete charge and discharge cycle. As a result of a complete cycle, the data comes from the real data collected, without estimation, the data accuracy is very high.

In one embodiment, as shown in FIG. 3, it is a structural block diagram of a battery test system in another embodiment. The battery test system further includes a battery control module 320, the battery control module 320 and the vehicle chassis battery and power conversion module 340 And the data acquisition module 310 is electrically connected. The battery control module 320 is used to control the connection between the battery of the vehicle chassis and the power conversion module 340, and is used to cut off the connection between the battery and the outside when the battery is in an abnormal state. Specifically, the battery control module 320 includes battery control components. By controlling the on-off of the battery control components, the on-off of the connection between the battery and the outside can be controlled to protect the battery. For example, the battery control module 320 may be a battery connector or other components with a switch function, which is not limited in this embodiment.

In one embodiment, please continue to refer to FIG. 3, the data collection module 310 includes a data collector master 314 and a data collector slave controller 312. Wherein, the data collector slave control 312 is electrically connected to the battery of the car chassis, and is used to collect the status information of each single cell in the battery of the car chassis and the current information of the battery system. The data collector main control 314 is electrically connected to the data collector slave control 312 and the battery control module 320, and is used to send the status information collected by the data collector slave control 312 to the main control module 350, and is also used to collect the battery When an abnormal situation occurs, the battery control module 320 is controlled to cut off the connection between the battery of the vehicle chassis and the power conversion module 340.

Specifically, the data collector master control 312 receives the data collected by the data collector slave control 312 and sends it to the master control module 350. The data collector master control 312 is also used to control the battery control unit 320 according to the collected abnormal data, so that the car The connection between the battery of the chassis and the power conversion module 340 is cut off to protect the battery of the vehicle chassis. The slave control 312 of the data collector can collect the voltage information and temperature information of all the single cells in the chassis of the car.

In one embodiment, the communication conversion module includes a communication converter for connecting with the main control module through a network cable, connecting with the data acquisition module through a CAN bus or a 485 bus, and connecting with the power conversion module through a 485 bus.

In one embodiment, after disconnecting the data acquisition connector and the main power line of the primary battery module, the data collector slave is connected to each single cell in the battery of the vehicle chassis through a sampling line, and The state information of each single cell corresponding to the sampling line and the current information of the battery system are calculated according to the data collected from the sampling line. For example, the battery in a car chassis contains 95 single cells connected in series. The data collector slave control 312 is connected to each single cell through a sampling line, and each cell is calculated based on the data collected from the sampling line. The voltage and temperature of each cell corresponding to the sampling line. For example, if the voltage of the first cell is U1, the negative pole of the cell is connected to a sampling line B0, and the positive pole is connected to a sampling line B1, then the sampling line B0 The pressure difference between the sampling line B1 and the sampling line B1 is U1. The data collector slave control can also collect the temperature of each single cell corresponding to each sampling line through the temperature sampling line.

Connect the signal acquisition connector of the battery system package to the signal acquisition connector of this system, and collect information across the original BMS; use the system's own data acquisition control for data acquisition, which is out of the original battery system of electric vehicles The control box does not need to analyze the original CAN protocol, and uses the system’s own data acquisition control for data acquisition.

In an embodiment, the main control module is also used to analyze the collected data of the battery of the automobile chassis. The main control module calculates the capacity, charging and discharging temperature, charging and discharging efficiency, and charging and discharging efficiency of the battery system of the car chassis according to the status information of each single cell in the battery system of the car chassis and the current information of the battery system. The internal resistance of a single cell;

Among them, the battery health level can be used to characterize the battery capacity, health, and performance status of the battery, that is, the percentage of the battery's full charge capacity to the rated capacity. Normally, the new factory battery is 100%, and the completely scrapped battery is 0%. According to the battery health of each single battery cell, the battery usage of the car chassis can be judged, and the battery test results can be automatically analyzed directly to obtain intuitive battery usage analysis results, without the need for professional operation analysis. Cost saving, convenient operation, and convenient for maintenance personnel to manage the battery.

In one embodiment, the main control module can automatically analyze and determine the quality of the battery in the battery chassis and the consistency of all the cells in the battery chassis based on the voltage information, temperature information, and current information of the battery system tested. . Further, the main control module judges the usage of the battery of the automobile chassis according to the battery health of each single cell, including: when the battery health of each single cell is greater than or equal to the first Threshold, it is judged that the battery of the car chassis is in normal use; when the battery health degree of a single cell is less than the second threshold, it is judged that the corresponding single cell is in a state to be repaired; when there is more than a preset number When the battery health of the single cell is less than the first threshold, it is determined that the battery of the vehicle chassis is in a state to be replaced.

Specifically, for example, the operating curve of the new battery cell can be compared with the operating curve of all the battery cells of the test chassis to determine the quality of the battery cell. Compare the operating voltage data of the new battery cell to estimate each The battery health of the cell. Among them, the new cell refers to the cell when it leaves the factory. The voltage running curve of the new cell can be obtained, and the voltage running curve can be drawn according to the collected voltage data of the single cell. Further, when the overall SOH of the battery is higher than 85%, it can be used by carriage return; when the individual cell fails to meet the requirements, the corresponding cell can be determined and repaired or replaced; when the SOH of most of the cells is less than At 85%, cascade utilization can be considered. Batteries with SOH in the range of 70% to 85% can be used in the field of energy storage, and batteries with SOH in the range of 50% to 70% can be used in the field of power backup. When the SOH difference between a certain cell and other cells is large, even if it does not reach the critical value of SOH, it indicates that the cell decays too fast and needs to be dealt with accordingly. Through the above judgment strategy, the quality of the battery in the battery chassis can be judged, and the consistency of all the cells in the battery chassis can be judged.

In one embodiment, please continue to refer to FIG. 3, the battery testing system further includes a display module 360, which is electrically connected to the main control module 350, and is used to display the status of each single cell in the automobile chassis Information, and the usage of the battery in the chassis of the car.

The above battery test system is electrically connected to the battery of the vehicle chassis through the data acquisition module, and is used to collect the status information of each single cell in the battery of the vehicle chassis; and transmit all the information collected by the data acquisition module through the communication conversion module. The status information and the current information of the battery system; the status information of each single cell in the automobile chassis and the current information of the battery system transmitted by the communication conversion module are received by the main control module. The status information and the current information of the battery system are analyzed, and the usage of the battery of the vehicle chassis is judged according to a preset judgment strategy. Through the above system, the battery of the car chassis can be directly connected to complete the analysis of the battery capacity, pressure difference, and battery cell operation consistency. The modular design of the system, high integration, save costs, save space, and facilitate operation.

The above-mentioned embodiments only express several implementation manners of the present application, and their description is relatively specific and detailed, but they should not be understood as a limitation to the scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the scope of protection of the patent of this application shall be subject to the appended claims.

Claims

A battery testing system is characterized in that it comprises:

A data collection module, electrically connected to the battery of the car chassis, for collecting the status information of the single cells in the battery system of the car chassis and the current information of the battery system; the status information includes voltage information and temperature information;

A communication conversion module, which is in communication connection with the data collection module, and is used to transmit the status information collected by the data collection module and the current information of the battery system;

The main control module is communicatively connected with the communication conversion module, and is used to receive the status information of each single cell in the battery system of the automobile chassis and the current information of the battery system transmitted by the communication conversion module. The status information and the current information of the battery system are analyzed, and the usage of the battery system of the automobile chassis is judged according to a preset judgment strategy.
The system according to claim 1, further comprising a power conversion module, the power conversion module is communicatively connected with the communication conversion module, and the power conversion module is electrically connected with the battery of the vehicle chassis and the power grid, The power conversion module is configured to mutually convert the AC power output from the power grid and the DC power output from the battery;

The power conversion module is further configured to receive a control instruction sent by the main control module through the communication module, and change the magnitude of the converted power and the direction of power conversion according to the control instruction.
The system according to claim 2, further comprising a battery control module, the battery control module is electrically connected to the battery of the automobile chassis, the power conversion module, and the data acquisition module, and the battery control module is used to control The connection between the battery of the vehicle chassis and the power conversion module is on and off, and is used to cut off the connection between the battery and the outside when the battery is in an abnormal state.
The system according to claim 2 or 3, wherein the power conversion module comprises an AC-DC converter, and the AC-DC converter is used to rectify the AC power output from the grid into a DC power supply for the vehicle chassis The battery of the vehicle is charged and fully charged to SOC 100%; it is also used to invert the DC power output from the battery of the vehicle chassis to AC power to discharge the power grid to SOC 0%.
The system according to claim 3, wherein the data acquisition module comprises a data collector master control and a data collector slave control, and the data collector slave control is electrically connected to the battery of the vehicle chassis for Collecting state information of each single cell in the battery of the vehicle chassis;

The master control of the data collector is electrically connected to the slave control and battery control module of the data collector, and is used to send the status information collected by the slave control of the data collector to the master control module, and is also used to When the battery is abnormal, the battery control module is controlled to cut off the connection between the battery of the vehicle chassis and the power conversion module.
The system according to claim 5, wherein the data collector is connected to the battery of the vehicle chassis through a sampling line after disconnecting the data acquisition connector and the main power line of the primary battery module. And calculate the state information of each single cell corresponding to the sampling line and the current information of the battery system according to the data collected from the sampling line.
The system according to claim 1, wherein the main control module is further used to calculate the state information of each single cell in the battery system of the automobile chassis and the current information of the battery system. The capacity, charging and discharging temperature, charging and discharging efficiency of the battery system of the car chassis and the internal resistance of each single cell;

Calculate the battery of each single cell according to the status information, the current information of the battery system and the capacity of the battery system of the car chassis, charge and discharge temperature, charge and discharge efficiency, and the internal resistance of each single cell Health

Judging the usage status of the battery of the automobile chassis according to the battery health of each single cell.
The system according to claim 7, wherein the main control module judges the usage of the battery of the automobile chassis according to the battery health of each single cell, comprising:

When the battery health of each single cell is greater than or equal to the first threshold, determining that the battery of the vehicle chassis is in a normal use state;

When the battery health of a single cell is less than the second threshold, it is determined that the corresponding single cell is in a state to be repaired;

When there are more than a preset number of single cells whose battery health is less than the first threshold, it is determined that the battery of the vehicle chassis is in a state to be replaced.
The system according to claim 7 or 8, further comprising a display module, the display module is electrically connected to the main control module, and is used to display the status of each single cell in the automobile chassis Information, the current information of the battery system, and the usage of the battery of the vehicle chassis.
The system according to claim 2, wherein the communication conversion module comprises a communication converter, which is used to connect with the main control module through a network cable, connect with the data acquisition module through a CAN bus or a 485 bus, and connect with the main control module through a CAN bus or a 485 bus. The power conversion module is connected through a 485 bus.