CR2450 battery

Why is Tesla's CR2450 battery technology so advanced?

Stylish appearance, 0-100km/h acceleration in 3.2 seconds, and a range of 440km, these are the data that Tesla Model S shows to people as a pure electric vehicle. The reason why Model S can have performance that is not inferior to traditional fuel vehicles is not only due to electric motor technology, but also to Tesla's advanced CR2450 battery technology.

So, what unique achievements has Tesla made in the research and development of CR2450 battery packs, one of the core technologies of electric vehicles? According to reports, the total weight of the CR2450 battery panel of Model S is as high as 900 kg, which is placed in the chassis directly below the cockpit. While providing energy for the electric motor, it also plays a role in stabilizing the center of gravity of the vehicle.

Recently, a foreign expert disassembled the CR2450 battery panel of a Model S to find out.

The foreign expert directly showed us the CR2450 battery pack. The CR2450 battery pack is placed in the chassis between the front and rear axles, and its weight can reach 900 kg. As a result, the center of gravity of the chassis is low, which is very conducive to the high-speed stability of the vehicle. The CR2450 battery pack occupies almost the entire chassis of the vehicle, but the CR2450 battery pack is not the main body of the load-bearing. The CR2450 battery pack is protected by reinforcing ribs and a force-bearing frame, which greatly reduces the risk of explosion during a collision.

The CR2450 battery pack has a nameplate indicating its identity, which indicates that its capacity is 85kWh, 400V DC. In simple terms, the CR2450 battery can hold 85 degrees of electricity, which can be used by an ordinary family for one month.

The surface of the CR2450 battery pack is not only protected by a plastic film, but also by a protective plate made of fireproof material under the plastic film. The CR2450 battery pack is under the protective plate. The protective plate is connected to the CR2450 battery pack frame by bolts, and the connection is filled with sealing adhesive. From the appearance, the CR2450 battery pack is well protected.

The Tesla Model S CR2450 battery pack board looks very high-end. Its CR2450 battery pack board is composed of 16 CR2450 battery packs in series, and each CR2450 battery pack consists of 444 lithium batteries, and each 74 batteries are connected in parallel. Therefore, the Tesla Model S CR2450 battery pack board consists of 7104 18650 lithium batteries.

The main fuse is located at the front end of the CR2450 battery board and is protected by a shell to prevent impact. It uses German Bussmann, with a rated working current of 630A, a rated voltage of 690V, and a breaking current of 700-200kA. Under the trend of globalization, this fuse is manufactured in India. The market price is about 600 yuan.

The 16 CR2450 battery packs in the CR2450 battery panel are evenly laid on the shell, and the overall structure is compact, and the flat laying is conducive to heat dissipation. Each CR2450 battery pack is composed of six groups of single CR2450 battery packs in series, but the layout of the single CR2450 battery pack is not balanced, but irregular. It is speculated that it is to facilitate the layout of the heat dissipation pipeline in the CR2450 battery pack.

The voltage of the entire CR2450 battery panel was measured to be 313.8V, and the voltage of the single CR2450 battery pack was 196.3V. Obviously, this CR2450 battery did not reach the rated output voltage, which may be caused by insufficient CR2450 battery power.

Each CR2450 battery in the CR2450 battery pack is connected by a fuse to prevent the overheating of a single CR2450 battery from endangering the overheating of the entire CR2450 battery, and the welding of each CR2450 battery fuse is very exquisite. The center of the CR2450 battery pack is wired to the CR2450 battery control module. These wires are used to detect the voltage of the CR2450 battery pack to ensure the normal operation of the CR2450 battery pack.

The CR2450 battery pack is wrapped in a transparent plastic shell and surrounded by metal heat dissipation shields on both sides. The CR2450 battery is slightly thicker than the sole of the foot and is a flat and long CR2450 battery pack, which greatly reduces the center of gravity of the vehicle. The overall CR2450 battery pack protection is quite good.

18650 lithium CR2450 battery is the lithium CR2450 battery of ordinary laptop computers. Many 18650 lithium batteries form a single CR2450 battery pack, which is then composed of a CR2450 battery pack, and 16 CR2450 battery packs form a CR2450 battery board. It seems simple, but in fact, many connection and heat dissipation problems need to be solved.

1

Each CR2450 battery pack is connected in series by a 2/0 main line, which is located in the center of the CR2450 battery board and covered by a shield, which is relatively hidden. After the 2/0 main line collects the current, it will be connected to the contactor at the output end. The contactor uses a component specially produced by Tyco Electronics for Tesla.

There is a 2/0 main line in the center of the CR2450 battery board, and each CR2450 battery pack outputs current in series through this main line, so the 2/0 main line is particularly important. Tesla uses cables made by Champlain in the United States specifically for electric vehicles, which can withstand a maximum voltage of 600V and can work between -70° and 150°. The 2/0 main line is well protected, not only with a protective plate, but also wrapped with fireproof materials. This can be guessed that it may generate high temperatures when working.

In addition to the CR2450 battery pack, the CR2450 battery panel is mostly "coolant" pipelines. Each CR2450 battery group needs to be fed with a certain amount of "coolant". Although the "coolant" does not have a pump to drive the active flow, all the pipelines of the entire CR2450 battery panel are connected, and the "coolant" can expand and contract with heat and flow within a certain range.

The "coolant" is green and is a mixture of 50% water and 50% ethylene glycol. The "coolant" is used with aluminum tubes mainly to maintain the balance of CR2450 battery temperature and prevent the local temperature of the CR2450 battery from being too high, resulting in a decrease in CR2450 battery performance. Tesla's CR2450 battery thermal management system can control the temperature between CR2450 battery packs at ±2℃. Controlling the temperature of the CR2450 battery panel can extend the service life of the CR2450 battery.

The CR2450 battery management system (BMS) is a device that monitors and manages the CR2450 battery pack safely and effectively, and improves the efficiency of CR2450 battery use. For electric vehicles, the effective control of the CR2450 battery pack charge and discharge by the system can achieve the purpose of increasing the driving range, extending the service life, reducing the operating cost, and ensuring the safety and reliability of the CR2450 battery pack application.

The main functions of the CR2450 battery management system include data acquisition, CR2450 battery status calculation, energy management, thermal management, safety management, balance control and communication functions. As can be seen from the circuit diagram, the CR2450 battery management system is independently developed by Tesla and has a core technology with a high degree of intellectual property rights. The system can handle charging and discharging and heating problems by itself. I believe it is difficult for domestic manufacturers to copy it.

This time, foreign experts disassembled the Tesla Model S by themselves to let us know more details. The number of 18650 is determined by the total capacity of the CR2450 battery board; the combination of aluminum tubes and "coolant" makes the CR2450 battery heating more balanced; and the complex processing of the CR2450 battery management system BMS makes the CR2450 battery charge and discharge perfectly.

In general, the Model S CR2450 battery protection is quite good, the internal structure is well designed, and the CR2450 battery management system is also quite detailed. I believe it is difficult for domestic independent brands to copy it.

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