Battery Box Binder Space Adjustment to Prevent Overflow
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Solution Overview
Problem
The existing battery manufacturing process faces issues with binder overflow during assembly, which compromises safety performance and energy density due to excessive binder usage.
Innovation Solution
A battery box design featuring a support member and an expansion member that adjusts the volumetric capacity of the accommodating space for binder, allowing for reduced binder injection and minimizing overflow, thereby enhancing safety and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If binder is injected to bind the support member and battery cell, then the binding strength is improved, but binder overflow occurs compromising safety and energy density
Solution Approach 1:
The support member transitions from a first state with a larger accommodating space for binder to a second state with a smaller accommodating space. The expansion member presses the support member to switch states, dynamically adjusting the binder accommodation capacity to prevent overflow while ensuring adequate binding space is available during the bonding process.
Solution Approach 2:
The volumetric capacity of the accommodating space is changed from a first volumetric capacity (when support member is in first state) to a second volumetric capacity (when support member is in second state). This parameter change allows the system to accommodate sufficient binder for strong bonding while preventing excessive binder accumulation that causes overflow.
2Reliability
If more binder is injected to ensure binding, then binding reliability is improved, but energy density decreases due to excessive binder
Solution Approach 1:
The support member's state changes dynamically to adjust the accommodating space volume. During binder injection, the support member is in the first state with larger capacity to ensure reliable binding. After bonding, the expansion member presses to switch to the second state with smaller capacity, reducing the space available for binder and thereby reducing the total quantity of binder needed while maintaining binding reliability.
3Manufacturing precision
If the accommodating space for binder is increased, then binding effectiveness is improved, but binder overflow risk increases
Solution Approach 1:
The accommodating space volumetric capacity is dynamically adjusted by pressing the support member from the first state to the second state using the expansion member. During the bonding process, the support member maintains the first state with larger accommodating space to ensure effective binding. After bonding completes, the support member transitions to the second state with smaller accommodating space, reducing overflow risk.
Solution Approach 2:
The expansion member is pre-configured to press the support member and switch its state. This preliminary action ensures that the accommodating space capacity is reduced after binder injection, preventing overflow before it occurs. The timing of the state switch is controlled to occur after binding but before any potential overflow scenario.
Data Source
AI summary
A battery box, a battery, an electric device, and a method and device for manufacturing battery are provided. The battery box includes a support member and an expansion member. The expansion member presses the support member so that the volumetric capacity of an accommodating space for accommodating binder between the support member and the battery cell changes. The volumetric capacity of the accommodating space can be adjusted. Therefore, under the condition that the accommodating space has a relatively large volumetric capacity, it is simple to inject an appropriate amount of binder; and after the binder is injected, the volumetric capacity of the accommodating space is reduced so that the binder spreads throughout the accommodating space. The foregoing box allows for binder injection reduction during battery assembly, thereby reducing the possibility of binder overflow, improving the safety performance of the battery, and also increasing the energy density of the battery.