CTP Battery Pack Cooling Plate Support for Cell Group Rigidity
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Solution Overview
Problem
The Cell to Pack (CTP) battery pack technology faces challenges with complex system design, high costs, difficulty in modularization, and low efficiency due to its module-less structure, which requires additional structural support and complicates thermal management.
Innovation Solution
A battery pack design that incorporates a housing with pressure relief assemblies and liquid cooling plates, featuring support members to stabilize adjacent cell groups, pressure relief pipes with weakened portions, and trigger channels to manage cyclic expansion forces and thermal safety, forming a fixed structure that optimizes mechanical integration and simplifies the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional structures are used to fix the cell group in module-less CTP battery pack, then the structural strength is improved, but the device complexity increases
Solution Approach 1:
The liquid cooling plate is merged with support members that directly support adjacent cell groups at their junctions. This integration eliminates the need for separate fixing structures, as the cooling plate simultaneously performs thermal management and structural support functions, thereby improving structural strength without increasing device complexity
Solution Approach 2:
The liquid cooling plate is designed to serve multiple functions: it provides thermal cooling to the cell groups while also acting as a structural support element through its support members. This multi-functionality allows the same component to address both thermal management and structural reinforcement needs, avoiding additional dedicated fixing structures
2Quantity of substance
If CTP technology is implemented with module-less structure, then the specific energy is improved, but the system design complexity increases
Solution Approach 1:
The liquid cooling plate integrates support members that directly support cell groups, merging thermal management and structural support functions into a single component. This reduces the number of separate systems needed, simplifying overall system design while maintaining high specific energy characteristics of CTP technology
3Temperature
If liquid cooling plate is used for thermal management, then the cooling efficiency is improved, but the plate deformation occurs under cell group pressure
Solution Approach 1:
Support members are strategically positioned at specific locations on the liquid cooling plate, namely at the junctions of adjacent cell groups. This localized reinforcement provides structural stability exactly where the cell groups exert pressure, preventing plate deformation in critical areas while maintaining overall cooling efficiency
4Reliability
If pressure relief assembly is pressed against cell groups, then the upward channeling is prevented, but the cyclic expansion force affects cell group stability
Solution Approach 1:
The liquid cooling plate with support members is merged with the pressure relief assembly to form an integrated fixed structure. This combination provides stable support to cell groups, counteracting cyclic expansion forces while maintaining proper pressure relief function, thereby preventing both upward channeling and stability issues
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
This design enhances the structural strength and thermal management of the battery pack, preventing deformation and upward channeling, while reducing production costs and improving efficiency by forming a combined mechanical structure that addresses thermal safety and rigidity issues.
Implementation Method 1
a liquid cooling plate connected to the housing and abutting against second sides of the cell groups
Implementation Method 2
a pressure relief assembly connected to the housing and opposite to an explosion-proof valve of each of the cells
Data Source
Figure 1
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AI summary
Disclosed is a battery pack according to the present disclosure. The battery pack includes a housing (1); a plurality of cell groups (3) including a plurality of cells (32); a pressure relief assembly (2) connected to the housing (1) and pressing against first sides (34) of the cell groups (3); and a liquid cooling plate (4) provided with a support member (42) located at a junction of two adjacent cell groups (3), and one side of the support member (42) supports a second side (35) of one of the two adjacent cell groups (3), another side of the support member (42) supports a second side (35) of another of the two adjacent cell groups (3).