Dual Liquid-Cooling Battery Box for Uniform Cell Heat Exchange
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Solution Overview
Problem
Existing battery packs experience uneven heat dissipation due to coolant distribution, leading to premature aging and reduced capacity of cells away from the liquid inlet, which shortens the service life of the battery pack.
Innovation Solution
A battery box design with dual liquid-cooling plates on opposite sides of the accommodation cavity, featuring runners and immersion holes that distribute coolant uniformly across the battery module, ensuring each cell receives consistent heat exchange and reduces high-temperature coolant residence time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single liquid inlet is provided at one end of the battery box, then the structure is simple, but cells away from the liquid inlet cannot contact sufficient low-temperature coolant, resulting in poor heat exchange effect
Solution Approach 1:
The cooling system is segmented into two independent liquid-cooling plates (first and second cooling plates) positioned at opposite ends of the battery box. Each cooling plate has its own liquid inlet and outlet, creating multiple coolant flow paths that distribute low-temperature coolant to different regions of the battery module, ensuring all cells receive adequate cooling
Solution Approach 2:
Different regions of the battery module are provided with localized cooling solutions through the two cooling plates positioned at opposite ends. Each cooling plate serves its adjacent region, allowing the cooling system to adapt to the spatial distribution of heat generation in different cell groups, improving overall heat exchange effectiveness
2Device complexity
If coolant flows through the battery box from one end to the other, then the cooling path is simple, but high-temperature coolant remains in the cavity for too long, reducing heat dissipation efficiency
Solution Approach 1:
The coolant flow path is segmented into two separate circulation loops, with each cooling plate having independent inlet and outlet channels. This creates parallel coolant flow paths that reduce the residence time of high-temperature coolant in the battery cavity, as coolant is continuously refreshed from both ends simultaneously
Solution Approach 2:
The dual cooling plate configuration enables continuous introduction of low-temperature coolant from both ends of the battery box simultaneously. This maintains a continuous cooling action throughout the battery cavity, preventing high-temperature coolant from stagnating and reducing heat dissipation efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances heat dissipation uniformity, prolongs the service life of each cell, and optimizes space utilization by compactly arranging the liquid inlet and outlet, thereby improving the overall efficiency and longevity of the battery pack.
Implementation Method 1
a coolant is directly sent into the battery box to contact a housing of the multiple cells for heat exchange
Implementation Method 2
the coolant is cooled outside the battery box and then is delivered to the liquid inlet after cooling
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Provided are a battery box and a battery pack containing the battery box. The battery box (100) includes a box body (11), a first liquid-cooling plate (12), a second liquid-cooling plate (13), a liquid inlet (14), and a liquid outlet (15). Accommodation cavity (111) for accommodating battery module (200) is disposed within the box body (11). The first liquid-cooling plate (12) and the second liquid-cooling plate (13) are located on two sides of the accommodation cavity (111) in the first direction respectively. First runners (121) are distributed within the first liquid-cooling plate (12). Length of each first runner (121) extends in the third direction. The first liquid-cooling plate (12) is provided with first immersion holes (122) communicating with the first runners (121) and the accommodation cavity (111). Second runners (131) are distributed within the second liquid-cooling plate (13). Length of each second runner (131) extends in the third direction. The second liquid-cooling plate (13) is provided with second immersion holes (132) communicating with the second runners (131) and the accommodation cavity (111). The liquid inlet (14) and the liquid outlet (15) communicate with the first runners (121) and the second runners (131) respectively. The battery box in the present application can increase the probability of each cell contacting a coolant, improve the heat exchange uniformity and effects of all the cells, and prolong the service life of all the cells.