In the rapid development of new energy vehicles, battery safety and performance have long been core concerns. The battery thermal management system acts like an "intelligent thermostat" for the battery pack. As one of the most common and fundamental mechanical components in daily life and industrial applications, our springs also play a critical role in new energy vehicle cooling systems.
That brings us to today's topic: cold plate springs in power battery cooling systems.
First, let's look at the core component of liquid cooling technology for power battery thermal management - the cold plate.
As a core thermal management solution, power battery liquid cooling and direct cooling technologies are designed to regulate the operating temperature of batteries. The cold plate is the key component enabling these two technologies, and is essential to ensuring the efficient and safe operation of power batteries.
For instance, the Liquid Cold Plate (LCP) serves as a key execution component of the liquid cooling management system. It makes direct contact with the heat source and dissipates heat generated by the battery through coolant circulation within its internal flow channels. Its core function is to establish an efficient heat transfer path from the battery cells to the external cooling circuit.
Cold Plate Spring in Power Battery Cooling System
In the power battery cooling system, the "cold plate spring" is not an internal component of the cold plate, but a supporting and buffering structure. It can be understood as the "shock-absorbing base" for the cold plate.
Its core functions are mainly reflected in two aspects:
- Absorb vibration and protect the cold plate: It absorbs and buffers the jolts and vibrations generated during vehicle operation, preventing the cold plate from deformation or coolant leakage caused by impact.
- Compensate for tolerances to ensure close fit: It can fill small gaps arising from manufacturing and assembly processes, enabling the cold plate to always closely attach to the battery surface, thus ensuring stable heat dissipation efficiency.
I. Structural Form
- Leaf Spring : A flat curved/bent elastic component made of single or multiple pieces of spring steel.
- Forms such as Spring Strip , Belleville Spring , or Coil Spring .
II. Installation Position
It is usually arranged below the Cold Plate and between the lower shell/mounting bracket of the battery pack, or between the Cold Plate and the battery module.
III. Working Principle
- Pre tightening force : When the battery pack is assembled, the cold plate spring is compressed and deformed, storing elastic potential energy.
- Continuous pressure : The spring generates an upward elastic restoring force, tightly pressing the cold plate against the bottom (or side) of the battery module.
- Thermal interface optimization :The clamping force ensures that the Silicon Pad between the cold plate and the battery cell/module is fully compressed.
- Completely eliminate air gaps (poor thermal conductivity of air), allowing heat to be efficiently conducted from the battery to the cold plate.
- Compensation tolerance : It can adaptively compensate for manufacturing/assembly tolerances of batteries, cold plates, structural components, as well as expansion and vibration displacement during battery operation.
IV. Key Role (Why Is It Necessary)
Enhanced heat dissipation : Ensure optimal thermal contact, minimize thermal resistance, and improve cooling efficiency by over 30%.
Uniform temperature : The pressure on the entire contact surface is uniform, avoiding local overheating and excessive temperature differences.
Buffer and vibration reduction : Absorb vehicle driving vibrations and protect the connection interface between the cold plate and the battery.
Long term stability : Provides constant compression force to prevent heat dissipation failure caused by aging and loosening of the thermal interface.
V. Relationship with Cold Plate
Cold Plate : A core heat dissipation component with internal channels for coolant circulation to remove heat.
Summary
Cold Plate Spring is an elastic compression component in the liquid cooling system of power batteries. Its core function is to provide continuous and uniform compression force between the Cold Plate and the battery module/cell, ensuring a tight fit of the thermal interface, eliminating gaps, and improving heat dissipation efficiency.
