Inbuilt Charging Circuit in Electrochemical Secondary Battery
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Solution Overview
Problem
Existing lithium-ion secondary batteries suffer from low energy density and capacity due to low space utilization in polymer battery cells, which is exacerbated by the need for separate packaging and connection with integrated circuit chips, leading to increased volume and cost.
Innovation Solution
An electrochemical secondary battery design with an inbuilt charging circuit, featuring a battery housing, circuit board module, and insulating washer, where the circuit board module is positioned between the battery cell and negative electrode cap, providing electromagnetic shielding, heat dissipation, and protection functions without welding, and utilizing a crimp shoulder structure to optimize space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate packaging of battery cell and integrated circuit chip is used, then manufacturing and assembly is simplified, but device volume increases and manufacturing cost increases
Solution Approach 1:
The patent merges the battery cell and integrated circuit chip into a single integrated package. The circuit board is positioned within the battery housing, with the charging circuit directly integrated into the battery structure. This eliminates the need for separate packaging and external connections, reducing overall device volume while maintaining manufacturing feasibility through a unified assembly process.
2Ease of manufacture
If separate packaging of battery cell and integrated circuit chip is used, then manufacturing and assembly is simplified, but manufacturing cost increases
Solution Approach 1:
The integration of the charging circuit directly into the battery structure eliminates the need for separate packaging, circuit boards, wires, and connectors. This reduction in component count and assembly steps decreases manufacturing complexity and cost, despite the increased integration density.
3Device complexity
If battery cell top seal of predefined height is used, then battery cell structure is simplified, but space utilization decreases
Solution Approach 1:
The patent repositions the integrated circuit chip and charging circuit from an external location to an internal position within the battery housing. By utilizing the vertical space above the battery cell and integrating components in three-dimensional space rather than external flat mounting, the design achieves improved space utilization without significantly complicating the battery cell structure.
4Quantity of substance
If larger space utilization of battery cell is achieved, then energy density and capacity increase, but structural design complexity increases
Solution Approach 1:
The integration of the charging circuit within the battery housing allows for optimized space utilization without requiring separate structural designs for the battery cell and circuit mounting. The unified structure enables larger active material volume while maintaining structural integrity through a single integrated design rather than multiple separate components.
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 space utilization within the battery cell, increasing energy density and capacity while reducing the need for external components, thereby improving the battery's performance and miniaturization potential.
Implementation Method 1
The negative electrode cap is arranged on the circuit board module to provide electromagnetic shielding, electrostatic shielding, and heat dissipation for the circuit
Implementation Method 2
The negative electrode cap is arranged on the circuit board module to provide electromagnetic shielding, electrostatic shielding, and heat dissipation for the circuit
Implementation Method 3
The insulating washer is arranged in a gap between both the battery housing and the circuit board module and the negative electrode cap, thus pressingly fixing the circuit board module between the crimp shoulder and the battery housing, and separating the battery housing from the negative electrode cap
Implementation Method 4
A recessed crimp shoulder structure is provided at an end of the battery housing in proximity to the negative electrode cap. The circuit board module is configured with the diameter thereof being sized between the inner diameter of a recess constituted by the crimp shoulder and the inner diameter of the battery housing, thus being engaged at either end of the crimp shoulder
Implementation Method 5
An electrically-conductive material is coated onto the inner surface of the through hole for enhancing the welding strength and increasing the electrical contact area and leading out the electrode connecting wires so as to be connected to the circuit board module
Data Source
Figure 1a~1b
Figure 1c
Figure 2a~2b
AI summary
An electrochemical secondary battery (100) having an inbuilt charging circuit comprises a battery housing (101), a battery cell (102), a positive electrode cap (105), a negative electrode cap (103), a circuit board module (104), and an insulating washer (106). A recessed loop line (107) structure is provided at an end of the battery housing (100) in proximity to the negative electrode cap (103). The battery cell (102) is arranged within the battery housing (101) and arranged between the positive electrode cap (105) and the loop line (107) structure. The positive electrode cap (105) is connected to the battery housing (101) to constitute the positive electrode of the secondary battery. The negative electrode cap (103) is arranged on the circuit board module (104). The circuit board module (104) is arranged between the loop line (107) and the negative electrode cap (103). The circuit board module (104) is configured with the diameter thereof being sized between the inner diameter of a recess constituted by the loop line (107) and the inner diameter of the battery housing (101), thus being engaged at either side of the loop line and separated from the battery cell (102). Electrode connecting wires (108a and 108b) are arranged on the battery cell (102). At least one through hole is provided on the circuit board module (104). An electrically-conductive material is coated onto the inner surface of the through hole. The insulating washer (106) is arranged in a gap between both the battery housing (101) and the circuit board module (104) and the negative electrode cap (103), thus pressingly fixing the circuit board module (104) between the loop line (107) and the battery housing (101), and separating the battery housing (101) from the negative electrode cap (103).