EV Battery Thermal Management System BTMS Solution

Short Description:

Battery Thermal Management Systems (BTMS) are a critical technology in fields such as electric vehicles and energy storage systems. They employ scientific temperature control methods to maintain battery packs within an optimal operating temperature range (typically 25°C to 40°C) and ensure temperature uniformity across the pack, thereby safeguarding battery safety, performance, and longevity, as well as the overall energy efficiency of the vehicle.

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Product Detail

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Product Description

Developed specifically for electric commercial vehicles, buses, and heavy-duty trucks, the BTMS solution utilizes a liquid-circulation thermal control architecture that integrates cooling, heating, and temperature equalization functions. The system precisely maintains the battery pack within its optimal operating temperature range and minimizes temperature differentials across cells, thereby enhancing safety, charging efficiency, and service life under extreme hot and cold operating conditions.

Core Functions

1. Cooling: Dissipates heat during fast charging and high-load operations, mitigating the risk of thermal runaway.
2. Heating (Preheating): Raises battery temperature in cold environments to ensure charging and discharging performance.
3. Temperature Uniformity: Minimizes temperature differences between cells to prevent localized hotspots.
4. Real-time Monitoring: Works with the BMS to collect temperature data and provide closed-loop control for pumps, valves, heaters, and compressors.

Product Parameter

NO.	Project	Parameter Specifications
1	Model	EHP6.0-1
2	Refrigeration capacity	7kW
3	Heating capacity	8kW
4	Rated voltage	600V DC
5	Low voltage power supply	18-32V DC
6	Overvoltage protection/recovery voltage	750/720V DC
7	Undervoltage protection/recovery	400/430V DC
8	Refrigerant carrier	50%/50%Ethylene Glycol/Water Solution
9	Refrigerant	R134a
10	Compressor displacement	34cc
11	working temperature	-40℃～50℃
12	Unit protection level	IP67
13	Outer diameter of water inlet pipe	Φ20mm
14	Outer diameter of water outlet pipe	Φ20mm
15	Total weight	＜55kg
16	Overall dimensions	See drawings
17	Installation method	M10 bolt installation
18	Installation dimensions	See drawings
19	Communication method	CAN2.0

Working Principle

The schematic diagram of our EHP battery thermal management system is shown in Figure 2-1. The solid red line in the figure represents the refrigeration cycle, and the dashed blue line represents the coolant cycle. This unit has three modes, including cooling mode, heating mode, and self-circulation mode. The unit switches between these three modes based on the parameters feedback from the battery pack BMS.

Working Principle

Application

Our BTMS solution is widely applied in electric buses, commercial trucks, off‑highway machinery, energy storage systems and rail transit vehicles. Under high‑rate charging, heavy‑load operation and extreme ambient temperature conditions, the system performs cooling, pre‑heating and temperature equalization for battery packs, ensuring battery safety, cycle life and system availability.