In the first quarter of 2015, the domestic new energy vehicle market accelerated with the stimulation of multiple favorable policies. In the first quarter alone, sales of new energy vehicle passenger vehicles reached 26,581 units. Of course, while electric vehicles are developing, they are inseparable from the construction of infrastructure that is compatible with them. As one of the key components of electric vehicles, the car charger plays a vital role in the popularity of electric vehicles. In terms of car charger test solutions, there are not many suppliers that can provide professional solutions. As a leading test and measurement solution provider in the field of new energy, Idex provides a test solution that not only fully meets the needs of different types of on-board charger testing, but also controls the test process and the charger itself through a set of software. Unique and important features not available in test solutions from other vendors.
Car charger and BMS battery management system
The charger is mainly used to charge the power battery on the electric car. According to whether it is installed in the car, the charger can be divided into a vehicle type (with the model) and a fixed type. The fixed charger is generally a large charger fixed in the charging station, mainly based on high power and fast charging. The car charger is installed inside the vehicle, and its advantage is that it can be charged at any time in the garage, roadside or residential area where AC power is supplied, and the power is relatively small.
At present, most of the on-board chargers use intelligent working methods to charge the power battery, which is directly related to the life of the power battery and the safety during charging and discharging. As the core power battery of an electric vehicle, it is a battery pack packaged by a plurality of single cells. Although the current through the single cells is the same, the depth of discharge will be different. Deep discharge is a kind of battery. Loss; and if the battery after deep discharge is also charged at a conventional current value, it is a further loss to the battery. Therefore, the BMS battery management system is an important part of electric vehicles to monitor and manage data such as power battery voltage and residual capacity (SOC). The diagram below shows the workflow between the car charger and the BMS battery management system. It can be seen that when the car charger is connected to the AC power, the power is not immediately output to the battery, but the BMS battery management system first collects and analyzes the state of the battery, and then adjusts the charging parameters of the charger.
For example, before charging, the BMS first detects the battery voltage. When the voltage is too low due to the detection of deep battery discharge, etc., it must first be repaired with a small current; if the battery voltage is within the normal range, it can jump. After this step, directly enter the constant current charging mode. The car charger and BMS battery management system all adopt CAN bus communication mode, and the current market application is more CAN2.0 protocol. In addition to the communication function, the on-board charger has a mechanism such as a fault alarm.
Idex car charger test solution
According to market research, the current demand for the charger industry should have the following functions: (1) testing of electrical performance and durability of the charger (2) simulation of the vehicle control system, which can control and monitor the fault status and operating parameters of the charger ( 3) Compatible with a variety of charger charging protocols, suitable for a variety of charger testing
In general, the on-board charger test system on the market can meet the requirements of (1), which is the most basic function that the solution should have. (2) The requirement is to complete the overall control and test requirements through a system of software in the test to achieve the most convenient test process and the best test results. (3) The demand is because many BMSs on the market today. It is designed and manufactured only for the battery of a certain type or even a certain type of vehicle. It is ideal for the specific battery effect, but it is lost to the battery of other models or brands, so the design and development of the car charger There are also specific models or BMS types. This means that the manufacturer of the car charger will have the test requirements of the car charger with different charging protocols. At this time, a test system that is compatible with the charging protocols of various chargers is very necessary. Looking at the entire automotive charger test solution market, the solution to meet these three needs can be rare, and how does Idex meet these test needs? The following will be analyzed one by one.
First of all, the configuration of the Aidex car charger test solution, the hardware has an electronic load to simulate the discharge of the battery, and the AC power supply is required to simulate the power supply to the charger. In addition, an oscilloscope and a power analyzer are required. In order to achieve the complete electrical performance of the charger test. Of course, for the entire charger test system, the test function that the PC software can achieve is particularly important and critical.
Test of electrical performance and durability of charger
The Edexx car charger test solution complies with the QC/T895-2011 standard (the standard is a standard test specification for car chargers for pure electric vehicles and hybrid electric vehicles that can be externally charged). The electrical performance test mainly includes tests such as starting surge current, power supply regulation rate, voltage ripple coefficient, overload test and charging efficiency. At present, some large measurement equipment manufacturers are involved in the vehicle charger test system, most of which are based on the development of power test systems, and can such test systems fully meet the test items of the car charger? Is it professional enough? Research shows that most of the on-board charger test systems on the market have defects such as unprofessional or complicated operation of the software interface, which requires the operator to have a strong language programming foundation to operate, and is not favored by charger manufacturers. And many software require users to edit the test process of each test item themselves, and the test efficiency is low.
The difference is that the host computer software of the Idex vehicle charger test system is more user-friendly and close to the requirements in the interface design. This system fully builds the electrical performance test items of the charger into the software, and the user only needs to drag and drop the required test items. And the flow of each test item has been built in the system by Aidex at the factory. The user only needs to open the corresponding test item interface, fill in the input AC value, simulate the load value and other parameters, when the test is completed. After that, the software will automatically determine the test results.
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