Battery thermal management system, in short, battery thermal management is a key system to ensure the temperature stability of the battery, which is an integral part of the battery pack. Then we need to talk about the structure of the battery pack first, in order to understand the battery thermal management system

  Battery thermal management system in battery pack structure

  The battery pack of new energy vehicles is generally installed in the bottom position of the electric vehicle, the BMW i3 complete car and battery pack model, just as a warm-up at the beginning of the article.

1. Battery pack for new energy vehicles

  New energy vehicle battery pack system: battery module / electrical connection system / mechanical structure system / battery thermal management system / battery voltage management / battery management system (BMS).

  Battery Management System: Battery Sensor / Controller / Brake, etc., which ensures that the battery pack in a safe working condition, will provide the necessary information for vehicle control, however, abnormalities can be immediately responded to deal with the occurrence of sampling the ambient temperature, detecting the battery status, and then according to the vehicle demand to determine the battery charging and discharging power. Its main functions: battery parameter monitoring / battery status estimation / online fault diagnosis / charging control / automatic equalization / battery thermal management.

  Battery module consists of multiple single batteries connected in parallel or in series, mainly responsible for releasing and storing energy, and transforming the capacity into power for vehicle driving, the battery module is generally wrapped by an aluminum alloy shell and mounted on the inner side of the battery pack case.

  Mechanical structure system: battery pack case / various metal brackets / fixing bolts, its role in the battery module: support / anti-mechanical shock load / mechanical vibration load / waterproof and dustproof environmental protection.

  Electrical Connection System: High-voltage jumper / high-voltage wiring harness / low-voltage wiring harness / relay, which continuously conveys the electrical signals of the power battery system to each required component, and the low-voltage wiring harness plays the role of transmitting signals / detecting signals / controlling signals.

  Battery Thermal Management System: A system that takes away the heat generated by the battery through a reasonable cooling method, so that the battery works and operates within a reasonable temperature range to improve the life and reliability of the battery module.

2. Two types of battery pack structure

  a). "T" type battery pack: part of it is located in the center of the car body, far away from the car body shell, can effectively avoid the car body on both sides of the external forces on the battery pack extrusion damage, but most of the battery module is concentrated in the rear side of the car body, once the battery pack is subjected to rear collision, the safety of the battery pack is very easy to be threatened, on behalf of the models are Chevrolet Volt.

  b) Plate-type battery pack: it is installed under the whole car body, increasing the internal space of the car, but the area of the plate-type battery pack close to the ground is larger, and it is more likely to be affected by special road conditions, and the main models are Chevrolet Bolt, Nissan Leaf, and Tesla Model S.

3. Example of Battery Management System of Wilma Automobile

  Conventional electric vehicle battery pack heating is accomplished through battery heating, and due to the large amount of power consumed, electric vehicles lose more range when they are just driving, while Wilma's Battery Thermal Management 2.0 system heats the battery pack through diesel fuel and assists the PTC electric heating system, so that the battery packs of Wilma vehicles can quickly reach the temperature required by the usage environment even in cold weather, thus ensuring the electric cell's Use efficiency.

  Detailed heating method: Weimar's Battery Thermal Management 2.0 system, when the battery pack is below 0℃, diesel heating is used to raise the temperature, the principle of which is equivalent to that of a gas water heater, and when the temperature of the battery pack rises to 0℃, it immediately switches to the dual roles of electric heating and diesel heating. In the 0 ℃ below the temperature rise through the diesel heating is completed, this heating method minimizes the battery in the low temperature, its heating for the battery pack loss of power. And when the dual-mode heating system will keep the battery pack temperature at the optimal discharge, the diesel heating system will Weimar designed pipeline circuit of the heat into the passenger compartment, the advantage of this system that the air conditioning warm air does not need to be heated by the battery, by the diesel heating can be completed.

Last Article：2021 Marketing Conference Ends Successfully

Next Article：Energy Storage System Cooling Device Introduction to Common Cooling Methods