CN202471930U - Temperature and volume test system for battery system - Google Patents

Abstract

The utility model relates to a battery system temperature and capacity testing system, which comprises a battery management system, monitoring equipment and a constant temperature and humidity test chamber for simulating different ambient temperatures and humidity. The battery management system acquires the capacity parameters of the batteries placed in the constant temperature and humidity test chamber, and the monitoring device processes and displays the capacity parameters. The battery system temperature and capacity test system of the utility model simulates different ambient temperatures and humidity through a constant temperature and humidity test chamber, and calculates the capacity of the battery in various states, which is the state of charge (State of Charge, SOC) of the battery in practical applications. Estimates are backed by accurate data.

Description

Battery system temperature and capacity test system

technical field

The utility model relates to a battery test system, in particular to a battery system temperature and capacity test system.

Background technique

At present, most batteries and battery management systems are mainly used in electric vehicles, and the working environment and status of electric vehicles are uncertain. This brings greater difficulty to the measurement of the capacity of the battery pack. However, the existing battery testing schemes all verify the charging and discharging process of the battery pack, the state of full capacity, and the state of complete discharge at room temperature. This scheme does not consider the influence of temperature on battery capacity. At present, most electric vehicles use lithium iron phosphate batteries. The ambient temperature has a great influence on the concentration of lithium ions Li﹢, iron ions Fe2﹢, and phosphate PO4 ³ - ions inside the battery, thus affecting the battery capacity. In addition, this solution estimates the remaining battery power too ideally. At present, the remaining power of electric vehicle batteries is calculated according to constant voltage charging and constant current discharge. When the car is in use, it is impossible to discharge at a constant current. The discharge power is different in the process of starting, driving, parking, etc., and it is impossible to use constant current discharge. to calculate the remaining power.

The above deficiencies lead to the lack of grasp of the performance of the battery pack in the existing test system, inaccurate estimation of the remaining power of the battery, and large test errors, which are not suitable for mass production.

Contents of the invention

Based on this, it is necessary to provide a battery system temperature and capacity test system for studying the capacity of the battery at different temperatures, so as to estimate the battery capacity more accurately.

A battery system temperature and capacity testing system includes a battery management system, monitoring equipment and a constant temperature and humidity test chamber for simulating different ambient temperatures and humidity. The battery management system obtains the capacity parameters of the batteries placed in the constant temperature and humidity test chamber, and the monitoring device processes and displays the capacity parameters.

In a preferred embodiment, the battery system temperature and capacity testing system further includes a charging and discharging testing cabinet connected with the battery management system and the battery, and capable of controlling the charging current and discharging current of the battery.

In a preferred embodiment, the monitoring device outputs a three-dimensional curve including temperature, charge-discharge rate and capacity of the battery pack.

In a preferred embodiment, the monitoring device is connected to the battery management system through a CAN card.

The temperature and capacity test system of the battery system of the utility model simulates different ambient temperatures and humidity through a constant temperature and humidity test chamber, and counts the capacity of the battery in various states, which is the State of Charge (SOC) of the battery in practical applications. ) estimates provide accurate data support.

Description of drawings

FIG. 1 is a structural schematic diagram of a battery system temperature and capacity testing system in an embodiment.

Detailed ways

The battery system temperature and capacity testing system of the present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

As shown in FIG. 1 , in an embodiment, the battery system temperature and capacity testing system mainly includes a battery management system 10 , a monitoring device 20 , a constant temperature and humidity test chamber 30 and a charge and discharge test cabinet 40 .

Wherein, the battery management system 10 is connected with the monitoring equipment 20 , the charge and discharge test cabinet 40 and the battery 50 . Wherein, the monitoring device 20 is connected to the battery management system 10 through a CAN card, and is used to display the data detected by the battery management system 10 . In this embodiment, the battery 50 is a battery pack connected to the load 60 .

The constant temperature and humidity test chamber 30 is used to simulate different ambient temperatures and humidity, and the battery 50 is placed therein. The charging and discharging test cabinet 40 is used to control the charging current and discharging current of the battery 50 . The monitoring device 20 can display parameters such as output temperature and humidity of the constant temperature and humidity test chamber 30 , and display parameters such as output current, voltage, and electric quantity of the charge and discharge test cabinet 40 . The battery management system 10 monitors the parameter changes of the battery 50 in real time, especially the capacity change and transmits it to the monitoring device 20 .

Utilize the utility model test system, can realize three kinds of battery capacity test schemes:

(1) The scheme of simulating the battery capacity under various ambient temperatures: use the constant temperature and humidity test chamber 30 to simulate different ambient temperatures, such as -30°C, -20°C, -10°C, 0°C, 10°C, 20°C , 45°C, 55°C, etc., verify the capacity change of the battery 50 through the battery management system 10;

(2) Schemes for simulating battery capacity testing under various charging and discharging powers: adjust the charging and discharging current of the charging and discharging test cabinet 40, for example, discharge at rates of 1C, 3C, and 5C, and use rates of 0.3C, 1C, and 3C Rate charging (C represents battery capacity), changing the output power of the battery 50, verifying the capacity of the battery 50 in these states;

(3) A plan for simulating various environmental files and testing battery capacity under different charging and discharging powers: Simultaneously use the constant temperature and humidity test chamber 30 to simulate different ambient temperatures, and adjust the charging and discharging current of the charging and discharging test cabinet 40 at the same time, through The battery management system 10 verifies the capacity change of the battery 50 .

Using the above solution to test batteries from different manufacturers, the monitoring device 20 can output a three-dimensional curve including temperature, charge-discharge rate, and battery capacity. The three-dimensional curve accurately reflects the real performance of the battery, can detect and judge the battery performance more accurately, and provides accurate data support for the estimation of the battery state of charge (State of Charge, SOC) in practical applications. Since this test system measures the battery capacity under simulated working conditions, its test data can be used as the basis for SOC correction in the actual driving of the vehicle.

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (4)

1. battery system temperature and volume test system; Comprise battery management system and watch-dog; It is characterized in that; Comprise that also one is used to simulate the constant temperature humidity chamber of varying environment temperature and humidity, said battery management system obtains the capacity parameter that is placed on the battery in the constant temperature humidity chamber, and said watch-dog processing also shows said capacity parameter.

2. battery system temperature according to claim 1 and volume test system is characterized in that, also comprise charge-discharge test cabinet that link to each other with battery with battery management system, may command battery charge and discharge current size.

3. battery system temperature according to claim 2 and volume test system is characterized in that, said watch-dog output comprises the three-dimensional curve of temperature, charge-discharge magnification and battery capacity.

4. battery system temperature according to claim 1 and volume test system is characterized in that, said watch-dog links to each other with battery management system through the CAN card.

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