Charging and discharging test system for truck starting lithium battery

Abstract

The invention relates to the technical field of lithium battery testing, and discloses a charging and discharging testing system for a truck starting lithium battery, which comprises a programmable power supply, a starting lithium battery pack and a low-voltage high-power electronic load, the positive pole and the negative pole of the programmable power supply are connected to the positive pole column and the negative pole column of the starting lithium battery pack through wires, a current sensor is further installed on the wire between the programmable power supply and the negative pole column of the starting lithium battery pack, and the positive pole column and the negative pole column of the starting lithium battery pack are connected with the positive pole and the negative pole of the low-voltage high-power electronic load through wires. Current sensors are installed on a wire between the low-voltage high-power electronic load and the negative pole of the starting lithium battery pack, and the output ends of the two current sensors are both connected to a power analyzer. According to the invention, a low-voltage high-power quick-response electronic load is integrated, current output exceeding 2000A when a truck starts a lithium battery to work can be simulated, the current rising and falling speed exceeds 2000A / ms, and the truck starting working condition can be completely and effectively simulated.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery testing, and in particular to a charging and discharging testing system for a truck starting lithium battery. Background Art

[0002] Trucks are also called cargo vehicles, generally referred to as trucks. They are vehicles that are mainly used to transport goods, and sometimes they also refer to vehicles that can tow other vehicles. They belong to the category of commercial vehicles. Generally, they can be divided into heavy and light types according to the weight of the vehicle. Most trucks use diesel engines as their power source, but some light trucks use gasoline, LPG or natural gas. With the development of technology, existing trucks are equipped with lithium batteries as their power source to achieve green and environmental protection.

[0003] The characteristics of truck starting lithium batteries when working are low voltage (12V / 24V), large current (up to 2000A or more), and instantaneousness (large current lasts for tens to hundreds of milliseconds). The current test system is unable to simulate such large current and rapid response. In addition, in the process of simulating such a large current test, the temperature and voltage of the battery system need to be monitored to ensure the safety of the battery, but the existing test system cannot effectively guarantee this: the test voltage range of the existing test system is a wide range of several hundred V, and for the voltage system below 36V such as the truck starter lithium battery, it is impossible to achieve targeted high-precision measurement and control; the current range effectively monitored by the existing test system is within 600A, and the 2000A current that the truck starter lithium battery will have during normal operation cannot be effectively measured and controlled; the lithium battery start-up test discharge requires a current of more than 2000A, which requires the test system to have a low-voltage and high-power load, otherwise it cannot simulate this test condition; the current greater than 2000A is highly destructive, and the safety of the test needs to be considered. The voltage and temperature of the test system and the lithium battery to be tested need to be monitored in real time, and effective protection is required, otherwise there will be a risk of thermal runaway. Therefore, we propose a charge and discharge test system for truck starter lithium batteries. Summary of the invention

[0004] The purpose of the present invention is to provide a charging and discharging test system for a truck starting lithium battery, which integrates a low-voltage, high-power, fast-response electronic load and can support a current output of more than 2000A when simulating the operation of a truck starting lithium battery, and the current rise and fall speed exceeds 2000A / ms, which can effectively simulate the truck starting condition and solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a charging and discharging test system for a truck starting lithium battery, comprising a programmable power supply, a starting lithium battery pack, a low-voltage high-power electronic load and an industrial computer; the positive electrode and the negative electrode of the programmable power supply are connected to the positive electrode column and the negative electrode column of the starting lithium battery pack through wires, and a current sensor is also installed on the wires between the programmable power supply and the negative electrode column of the starting lithium battery pack, the positive electrode column and the negative electrode column of the starting lithium battery pack are connected to the positive electrode and the negative electrode of the low-voltage high-power electronic load through wires, and the low-voltage high-power electronic load and the negative electrode column of the starting lithium battery pack are installed with a current sensor, and the output ends of the two current sensors are connected to a power analyzer;

[0006] It also includes a temperature acquisition card, and the temperature probes connected to the temperature acquisition card are respectively installed on the positive pole, the negative pole and the output wires connected to the positive pole and the negative pole of the starting lithium battery pack;

[0007] A CAN / RS485 / RS232 communication card is also provided, and the CAN / RS485 / RS232 communication card is connected to the communication interface of the starter lithium battery pack;

[0008] The industrial computer is respectively connected with a programmable power supply, a CAN / RS485 / RS232 communication card, a power analyzer, a temperature acquisition card and a low-voltage high-power electronic load.

[0009] As a preferred implementation mode of the present invention, the industrial computer is connected to the programmable power supply via RS232 / 485, LAN, USB or CAN.

[0010] As a preferred implementation mode of the present invention, the industrial computer is connected to the CAN / RS485 / RS232 communication card via PCI or USB.

[0011] As a preferred implementation manner of the present invention, the industrial computer is connected to the power analyzer via RS232 / 485, LAN, USB or CAN.

[0012] As a preferred implementation mode of the present invention, the industrial computer is connected to the temperature acquisition card via PCI or USB.

[0013] As a preferred implementation mode of the present invention, the industrial computer is connected to the low-voltage and high-power electronic load via RS232 / 485, LAN, USB or CAN.

[0014] As a preferred embodiment of the present invention, the positive electrode column and the negative electrode column of the starting lithium battery pack are connected to the charging wire and the discharging wire through a special clamp for truck starting lithium battery terminal posts.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The charging and discharging test system for truck starting lithium batteries of the present invention integrates a low-voltage, high-power, fast-response electronic load, which can support a current output of more than 2000A when simulating the operation of a truck starting lithium battery, and the current rise and fall speed exceeds 2000A / ms, which is fully capable of effectively simulating the truck starting condition.

[0017] 2. The charging and discharging test system for truck starting lithium batteries of the present invention uses a special clamp for truck starting lithium battery terminals, which is fully adapted to the lithium battery terminals to avoid safety hazards caused by false connection and heating when large current passes through.

[0018] 3. The charging and discharging test system for truck starting lithium batteries of the present invention integrates multiple temperature probes. During the test, the host computer of the test system will continuously monitor the temperatures of the positive wiring harness, positive pole terminal, negative wiring harness, negative pole terminal and other positions, and can provide timely protection when abnormal temperature occurs.

[0019] 4. The charging and discharging test system for truck starting lithium batteries of the present invention aims at the actual working condition that the charging current of the truck starting lithium battery is small (not more than 150A) but the discharging current is very large (more than 2000A). This test system adopts a dual current sensor sampling mode and sets two current sampling points to monitor the charging current and the discharging current respectively. A small-range Hall sensor is used to monitor the charging current, and a large-range Hall sensor is used to monitor the discharging current, thereby improving the current sampling accuracy of the system.

[0020] 5. The charging and discharging test system for the truck starting lithium battery of the present invention integrates multiple communication methods such as RS485, RS232, CAN communication, etc., and can establish communication with the starting lithium battery pack under test. The test host computer can read the communication data of the lithium battery under test, and can analyze and monitor the voltage, current, temperature and other data of the lithium battery pack under test in real time, and perform timely processing when an abnormal state occurs in the lithium battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of the charging and discharging test system for truck starting lithium batteries of the present invention; DETAILED DESCRIPTION

[0023] See also Figure 1The present invention provides a technical solution: a charging and discharging test system for a truck starting lithium battery, comprising a programmable power supply: a charging power supply for outputting a controllable voltage, a starting lithium battery pack, a low-voltage high-power electronic load and an industrial computer; the positive and negative electrodes of the programmable power supply are connected to the positive and negative electrodes of the starting lithium battery pack through wires. When working, the required charging voltage is selected by the programmable power supply, for example, a 12V starting lithium battery pack uses a normal charging voltage between 13.7V and 14.5V, or a 24V starting lithium battery pack uses a normal charging voltage between 26V and 28.8V. A higher voltage can also be used during testing to test the stability of charging.

[0024] The positive and negative poles of the starting lithium battery pack are connected to the positive and negative poles of the low-voltage high-power electronic load through wires. The discharge performance of the starting lithium battery pack at different powers is tested by the low-voltage high-power electronic load. The positive and negative poles of the starting lithium battery pack are connected to the charging and discharging wires with special clamps, which are fully adapted to the lithium battery poles to avoid safety hazards caused by heat due to false connection when large current passes through.

[0025] In order to test the charging power and discharging power, a current sensor is installed on the wire between the programmable power supply and the negative pole of the starting lithium battery pack. Similarly, a current sensor is installed on the wire between the low-voltage high-power electronic load and the negative pole of the starting lithium battery pack. The output ends of the two current sensors are connected to the power analyzer, which can analyze the charging and discharging currents. The charging and discharging voltages can be directly obtained from the programmable power supply and the low-voltage high-power electronic load, and accurate charging and discharging power can be obtained. The power analyzer is connected to the industrial computer to directly receive data. A small-range Hall sensor is used to monitor the charging current, and a large-range Hall sensor is used to monitor the discharging current, thereby improving the current sampling accuracy of the system.

[0026] In order to realize temperature monitoring during the charging and discharging process, a temperature acquisition card is also provided, and multiple temperature probes are provided at the same time. The temperature probes are connected to the temperature acquisition card, and multiple different temperature probes are respectively installed on the positive pole, negative pole and output wires connected to the positive pole and negative pole of the starting lithium battery pack. Therefore, when charging or discharging, the temperature of the positive pole, negative pole during charging and the wire during discharging can be detected, thereby ensuring the temperature of the charging and discharging test process is reliable. When there is an abnormality, it can be directly handled to avoid danger.

[0027] A CAN / RS485 / RS232 communication card is also provided, and the CAN / RS485 / RS232 communication card is connected to the communication interface of the starting lithium battery pack, and is used to obtain various data of the starting lithium battery pack during the charging and discharging process, including voltage, current, temperature, internal resistance and other data related to the starting lithium battery pack.

[0028] The industrial computer is respectively connected to a programmable power supply, a CAN / RS485 / RS232 communication card, a power analyzer, a temperature acquisition card and a low-voltage high-power electronic load; the industrial computer is connected to a programmable power supply via RS232 / 485, LAN, USB or CAN; the industrial computer is connected to a CAN / RS485 / RS232 communication card via PCI or USB; the industrial computer is connected to a power analyzer via RS232 / 485, LAN, USB or CAN; the industrial computer is connected to a temperature acquisition card via PCI or USB; the industrial computer is connected to a low-voltage high-power electronic load via RS232 / 485, LAN, USB or CAN, and the integrated multiple communication modes can establish communication with the starter lithium battery pack under test, the test host computer can read the communication data of the lithium battery under test, can analyze and monitor the voltage, current, temperature and other data of the lithium battery pack under test in real time, and perform timely processing when an abnormal state occurs in the lithium battery pack.

[0029] When in use, the starting lithium battery pack is charged with the output voltage to be tested through a programmable power supply. During the charging process, the charging power is obtained by using a current sensor in conjunction with a power analyzer, and the temperature during charging can be obtained through a temperature probe with a temperature acquisition card. The CAN / RS485 / RS232 communication card obtains various parameter data of the starting lithium battery pack and transmits them to the industrial control computer. During the discharge test, the starting lithium battery pack discharges to a low-voltage, high-power electronic load. During the discharge process, the current sensor is used in conjunction with a power analyzer to obtain the discharge power, and the temperature probe with a temperature acquisition card can be used to obtain the temperature of the electrode column and the discharge wire during discharge to ensure safety. During the discharge process, the CAN / RS485 / RS232 communication card obtains various parameter data of the starting lithium battery pack.

Claims

1. A charging and discharging test system for truck starting lithium batteries, characterized in that: It includes a programmable power supply, a starting lithium battery pack, a low-voltage high-power electronic load and an industrial computer; the positive and negative electrodes of the programmable power supply are connected to the positive and negative electrodes of the starting lithium battery pack through wires, and a current sensor is also installed on the wires between the programmable power supply and the negative electrode of the starting lithium battery pack, the positive and negative electrodes of the starting lithium battery pack are connected to the positive and negative electrodes of the low-voltage high-power electronic load through wires, and a current sensor is installed on the wires between the low-voltage high-power electronic load and the negative electrode of the starting lithium battery pack, and the output ends of the two current sensors are connected to a power analyzer; It also includes a temperature acquisition card, and the temperature probes connected to the temperature acquisition card are respectively installed on the positive pole, the negative pole and the output wires connected to the positive pole and the negative pole of the starting lithium battery pack; A CAN / RS485 / RS232 communication card is also provided, and the CAN / RS485 / RS232 communication card is connected to the communication interface of the starter lithium battery pack; The industrial computer is respectively connected with a programmable power supply, a CAN / RS485 / RS232 communication card, a power analyzer, a temperature acquisition card and a low-voltage high-power electronic load.

2. A charging and discharging test system for truck starting lithium batteries according to claim 1, characterized in that: The industrial computer is connected to the programmable power supply via RS232 / 485, LAN, USB or CAN.

3. A charging and discharging test system for truck starting lithium batteries according to claim 1, characterized in that: The industrial computer is connected to the CAN / RS485 / RS232 communication card via PCI or USB.

4. A charging and discharging test system for truck starting lithium batteries according to claim 1, characterized in that: The industrial computer is connected to the power analyzer via RS232 / 485, LAN, USB or CAN.

5. A charging and discharging test system for truck starting lithium batteries according to claim 1, characterized in that: The industrial computer is connected to the temperature acquisition card via PCI or USB.

6. A charging and discharging test system for truck starting lithium batteries according to claim 1, characterized in that: The industrial computer is connected to the low-voltage and high-power electronic load via RS232 / 485, LAN, USB or CAN.

7. A charging and discharging test system for truck starting lithium batteries according to claim 1, characterized in that: The positive pole and the negative pole of the starting lithium battery pack are connected to the charging wire and the discharging wire through a clamp specially used for the truck starting lithium battery terminal.

Images