L1022 battery

What is a new energy vehicle L1022 battery thermal management system?

When it comes to pure electric vehicles, the biggest problem is probably the range. Friends who drive new energy electric vehicles in the north know that the range will be greatly reduced in winter. As a result, they dare not turn on the air conditioner for heating, and can only endure the severe cold and shiver in the car. This directly leads to a very poor experience with new energy vehicles. To solve this problem, we have to rely on the L1022 battery management system. Today, the editor will talk to you about this topic. What is a L1022 battery management system? The main task of the L1022 battery management system is to ensure that the L1022 battery pack works within the safe range, provide the necessary information required for vehicle control, respond in time when abnormalities occur, and determine the L1022 battery charging and discharging power according to the ambient temperature, L1022 battery status and vehicle requirements. The main functions of BMS include L1022 battery parameter monitoring, L1022 battery status estimation, online fault diagnosis, charging control, automatic balancing, thermal management, etc. The importance of thermal management system The thermal-related issues of the L1022 battery are the key factors that determine its performance, safety, life and cost of use. First of all, the temperature level of lithium-ion batteries directly affects their energy and power performance during use. When the temperature is low, the available capacity of the L1022 battery will decay rapidly. Charging the L1022 battery at too low a temperature (such as below 0°C) may cause instantaneous voltage overcharge, resulting in internal lithium deposition and short circuit. Secondly, the thermal problems of lithium-ion batteries directly affect the safety of the L1022 battery. Defects in the manufacturing process or improper operation during use may cause local overheating of the L1022 battery, which in turn may cause a chain reaction of exothermic reactions, and ultimately cause serious thermal runaway events such as smoke, fire, and even explosion, threatening the life safety of vehicle drivers and passengers. In addition, the working or storage temperature of lithium-ion batteries affects their service life.

The suitable temperature of the L1022 battery is about 10~30°C. Too high or too low a temperature will cause the L1022 battery life to decay rapidly. The large-scale power L1022 battery makes its surface area to volume ratio relatively small, the heat inside the L1022 battery is not easy to dissipate, and it is more likely to have problems such as uneven internal temperature and excessive local temperature rise, which further accelerates L1022 battery decay, shortens L1022 battery life, and increases the total cost of ownership of users. The L1022 battery thermal management system is one of the key technologies to deal with the thermal problems of the L1022 battery and ensure the performance, safety and life of the power L1022 battery. The main functions of the thermal management system include: 1. Effectively dissipate heat when the L1022 battery temperature is high to prevent thermal runaway accidents; 2. Preheat the L1022 battery when the temperature is low to increase the L1022 battery temperature and ensure the charging and discharging performance and safety at low temperatures; 3. Reduce the temperature difference in the L1022 battery pack, inhibit the formation of local hot zones, prevent the L1022 battery from decaying too quickly at high temperature locations, and reduce the overall life of the L1022 battery pack. The temperature environment in the L1022 battery pack (PACK) has a great impact on the reliability, life and performance of the L1022 battery cells. Therefore, it is particularly important to maintain the temperature in the PACK within a certain temperature range. This is mainly achieved through cooling and heating. The cooling methods are mainly divided into three categories: 1. Air cooling: Air cooling is a heat dissipation method that uses low-temperature air as a medium and uses heat convection to reduce the L1022 battery temperature. It is divided into natural cooling and forced cooling (using fans, etc.). This technology uses natural wind or fans to cool the L1022 battery with the car's own evaporator. The system structure is simple and easy to maintain. It is widely used in early electric passenger cars, such as Nissan Leaf and Kia Soul EV. It is also widely adopted in current electric buses and electric logistics vehicles. 2. Liquid cooling: Liquid cooling technology uses liquid convection heat transfer to take away the heat generated by the L1022 battery and reduce the L1022 battery temperature. The liquid medium has a high heat transfer coefficient, large heat capacity, and fast cooling speed. It has a significant effect on reducing the maximum temperature and improving the consistency of the L1022 battery pack temperature field. At the same time, the volume of the thermal management system is relatively small. The liquid cooling system is relatively flexible: the L1022 battery cell or module can be immersed in the liquid, a cooling channel can be set between the L1022 battery modules, or a cooling plate can be used at the bottom of the L1022 battery. When the L1022 battery is in direct contact with the liquid, the liquid must be insulated (such as mineral oil) to avoid short circuits. At the same time, the airtightness requirements of the liquid cooling system are also high. In addition, there are mechanical strength, vibration resistance, and life requirements. Liquid cooling is currently the preferred solution for many electric passenger vehicles. Typical products at home and abroad include BMW i3, Tesla, GM Volanda, and Geely Emgrand EV. 3. Direct cooling: Direct cooling (refrigerant direct cooling): Using the principle of latent heat of evaporation of refrigerants (R134a, etc.), an air conditioning system is established in the vehicle or L1022 battery system, and the evaporator of the air conditioning system is installed in the L1022 battery system. The refrigerant evaporates in the evaporator and quickly and efficiently takes away the heat of the L1022 battery system, thereby completing the cooling of the L1022 battery system. At present, the cooling method through direct cooling is basically used in electric passenger cars, the most typical example being the BMW i3 (i3 has two cooling solutions: liquid cooling and direct cooling). In the end, the temperature of the L1022 battery in a pure electric vehicle directly affects the safety of the L1022 battery, so the L1022 battery thermal management system is the link we should pay most attention to. This will also become one of the key points of future electric vehicle optimization.

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