Battery Pack Adhesive Member for Temperature Measurement
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Solution Overview
Problem
Existing battery packs face challenges in accurately measuring the temperature of Li-ion batteries during expansion and contraction, leading to inconsistent current control and potential damage due to the separation of the battery protection device from the cap plate.
Innovation Solution
The battery pack incorporates a first adhesive member that crosses the lengthwise direction of the battery protection device, ensuring it remains fixedly attached to the case and cap plate, even during expansion and contraction, using a polyimide tape for secure contact and a second adhesive member for additional support, along with a PTC device or temperature fuse for current control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the battery protection device is directly attached to the cap plate without adhesive members, then the structure is simple, but the temperature measurement accuracy deteriorates due to separation during expansion and contraction
Solution Approach 1:
The patent introduces adhesive members as intermediary elements between the battery protection device and the cap plate. These adhesive members maintain continuous contact during battery expansion and contraction, enabling accurate temperature measurement without requiring a complex rigid attachment structure.
Solution Approach 2:
The adhesive members function as flexible thin films that can accommodate the dimensional changes of the battery during charge-discharge cycles. This flexibility allows the battery protection device to maintain contact with the cap plate while the battery expands and contracts, solving the measurement accuracy problem without rigid constraints.
2Measurement precision
If adhesive members are added to fix the battery protection device, then temperature measurement accuracy improves, but device complexity increases
Solution Approach 1:
The adhesive members serve as simple intermediary components that bridge the battery protection device and cap plate. Rather than designing a complex mechanical attachment system, the patent uses these straightforward adhesive elements to achieve reliable temperature measurement while minimizing structural complexity.
3Ease of manufacture
If the battery protection device is loosely attached, then ease of assembly improves, but reliability deteriorates due to inconsistent contact during operation
Solution Approach 1:
The adhesive members act as mediators that provide reliable electrical and thermal contact between the battery protection device and cap plate throughout operation. This ensures consistent temperature measurement and current control while maintaining ease of assembly through simple adhesive application rather than complex fastening procedures.
4Reliability
If multiple adhesive members are used to secure the battery protection device, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The patent divides the adhesive attachment into multiple segments or zones, with adhesive members positioned at specific locations on the battery protection device. This segmentation ensures reliable contact at critical points while simplifying the overall manufacturing process by focusing adhesive application where it is most needed, rather than requiring complete surface coverage.
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 configuration allows for accurate temperature measurement and effective current control, preventing damage by maintaining consistent contact between the battery protection device and the cap plate, ensuring reliable operation of the Li-ion battery.
Implementation Method 1
a first adhesive member, at least a part of which is disposed on the case crosses a lengthwise direction of the battery protection device
Implementation Method 2
the battery protection device is a positive temperature coefficient (PTC) device that includes a first plate connected to the electrode terminal, a PTC main body connected to the first plate, and a second plate connected to the PTC main body and connected to the protection circuit board assembly
Data Source
AI summary
A battery pack includes a bare cell that includes an electrode assembly, a case for accommodating the electrode assembly, and a cap plate arranged at one side of the case, a protection circuit board assembly for controlling charge/discharge of the bare cell, a battery protection device electrically connected to the protection circuit board assembly, and a first adhesive member. At least a part of the first adhesive member is disposed on the case. The first adhesive member crosses the battery protection device in a lengthwise direction of the battery protection device.