Series Battery Pack Layout for High-Voltage Fast Charging
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Solution Overview
Problem
The demand for rapid charging in batteries has increased due to higher power consumption in devices, but existing polymer lithium ion batteries face limitations in charging speed due to material constraints and high-current charging inefficiencies.
Innovation Solution
A battery pack configuration that includes a first cell set, a second cell set juxtaposed in a specific direction, and a third cell connected in series, allowing for increased maximum withstand voltage and enabling rapid charging in a high voltage and low current state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-current charging of a single cell is used to increase charging speed, then charging current is improved, but the coating weight of active substance must be reduced, thereby reducing energy density
Solution Approach 1:
The battery pack is divided into multiple cells (first cell, second cell, third cell) connected in series. This segmentation allows the total charging power to be distributed across multiple cells, enabling high current charging without requiring each individual cell to handle the full current, thus maintaining higher coating weights and energy density.
2Productivity
If high-current charging is used, then charging speed is improved, but the charging process quickly reaches limiting voltage and transitions to dropping current charging, reducing the duration of effective high-current charging
Solution Approach 1:
By dividing the battery into multiple series-connected cells, each cell operates at a lower voltage level during charging. This extends the duration each cell can maintain optimal charging current before reaching its voltage limit, thereby prolonging the effective high-current charging period for the entire battery pack.
3Reliability
If a single cell is used with limited voltage (less than 4.48V), then material structure constraints are satisfied, but high-power charging with high voltage and low current cannot be realized, limiting charging speed
Solution Approach 1:
Multiple cells are connected in series to achieve the desired total voltage while keeping individual cell voltages within the safe operating range (less than 4.48V). This configuration enables high-power charging by distributing the voltage across multiple cells, allowing the system to operate at high voltage without exceeding material structure constraints of individual cells.
4Power
If multiple cells are arranged in series to increase voltage, then maximum withstand voltage is improved, but device complexity increases
Solution Approach 1:
The first cell and second cell are juxtaposed with their positive and negative electrodes aligned, allowing the third cell to be positioned between them in a compact arrangement. This merging of spatial configurations reduces overall structural complexity compared to traditional series connections, while still achieving the desired high voltage through series connection of all three cells.
Data Source
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AI summary
The present application relates to a battery pack and terminal, comprising: a first cell set comprising at least one first cell; a second cell set juxtaposed with the first cell set in a first direction and comprising at least one second cell; a third cell juxtaposed with the first cell set and the second cell set in a second direction. A positive pole lug of the third cell and a negative pole lug of the third cell are located at an end of the third cell facing toward the first cell and the second cell. The first cell set, the third cell and the second cell set are sequentially connected in series; the first direction is perpendicular to the second direction.