Mixed-Chemistry Battery Cell Groups for Safer Energy Throughput
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Solution Overview
Problem
Existing secondary batteries face challenges in balancing energy output with safety performance, as increasing energy density through more cells or advanced materials like NCM leads to weight, volume, and safety issues, and existing solutions fail to fully utilize the energy potential of high-volume energy density cells due to internal resistance and heat management problems.
Innovation Solution
A battery configuration that combines first-type and second-type battery cells of different chemical systems, where the first-type cells have higher capacity and lower energy density, and the second-type cells have lower capacity and higher energy density, arranged in series to optimize energy release and safety, with specific ratios of capacity, heat conductivity, and density to manage stress and heat distribution effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the number of battery cells is increased to enhance the overall energy of the secondary battery, then the energy output is improved, but the weight and volume of the secondary battery will increase correspondingly
Solution Approach 1:
The patent changes the chemical system parameter of battery cells from conventional LFP to NCM ternary material, which has higher volume energy density. This allows achieving higher energy output without proportionally increasing weight and volume, as the NCM material provides more energy per unit volume compared to LFP material.
2Use of energy by moving object
If NCM ternary material is used as positive electrode material to achieve higher volume energy density, then the energy output is improved, but gas production increases and internal resistance increases, resulting in serious heating
Solution Approach 1:
The patent introduces a battery management system that acts as an intermediary to monitor and control the charging and discharging processes of NCM battery cells. This system prevents overcharging and excessive discharge rates that lead to overheating and gas production, thereby enabling safe utilization of the high energy density characteristics of NCM material.
3Reliability
If safety battery cells with lower heat diffusion are added to block heat runaway, then the safety performance is improved, but the energy output of the battery module cannot be fully released
Solution Approach 1:
The patent applies local quality by strategically placing thermal management components and safety battery cells at specific locations within the battery module where heat generation is highest. This localized approach provides safety protection precisely where needed without adding safety components throughout the entire module, thereby minimizing the impact on energy throughput.
Data Source
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AI summary
The present application provides a battery, an apparatus, and a method and device for manufacturing the battery. The battery includes: a first-type battery cell group and a second-type battery cell group which are connected in series, wherein the first-type battery cell group is composed of multiple first-type batteries connected in parallel, and the second type battery cell group is composed of at least one second type battery cell connected in parallel; the first-type battery cell and the second-type battery cell are battery cells of different chemical systems, and the volume energy density of the first-type battery cell is less than the volume energy density of the second-type battery cell; and the capacity Cap1 of the first-type battery cell group is greater than the capacity Cap2 of the second-type battery cell group, in which the capacity Capl of the first-type battery cell group is the sum of the capacities of the corresponding first-type battery cells, and the capacity Cap2 of the second-type battery cell group is the sum of the capacities of the corresponding second-type battery cells. While ensuring the safety performance of the battery, the service life and the energy throughput of the battery module are effectively improved.