一种单体电池及电池包
By setting a cavity in the individual battery casing and controlling its volume ratio to the cell volume to be between 4% and 25%, the risk of bulging caused by insufficient gas storage space inside the casing is solved, the safety and energy density of the battery are improved, and the service life and assembly difficulty are optimized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-07-17
AI Technical Summary
With existing single-cell batteries, the internal gas storage space is compressed while the casing volume remains unchanged, resulting in a high risk of bulging, which may even lead to explosion in severe cases, affecting service life and safety.
An accommodating cavity is provided on the first wall of the casing. The accommodating cavity is connected to the inside of the casing and can expand outwards when subjected to internal forces, forming an expanded space. The ratio of the accommodating cavity to the cell volume is controlled between 4% and 25% to balance gas storage capacity and space occupation, thereby improving safety and energy density.
By rationally designing the volume ratio of the accommodating cavity, internal pressure can be effectively relieved, the risk of bulging can be reduced, service life and safety can be optimized, and the energy density and assembly efficiency of the battery pack can be improved at the same time.
Smart Images
Figure CN224519976U_ABST
Abstract
Claims
1. A single cell, characterized by, include: The housing (10) has an internal battery cell and a receiving cavity (20) on the first wall (110) of the housing (10). The receiving cavity (20) is connected to the internal area of the housing (10) and can expand towards the outside of the housing (10) when subjected to internal force. The volume of the fully expanded cavity (20) is V1, and the volume of the battery cell is V2. In the single battery cell, the ratio of the expanded volume of the cavity (20) to the volume of the battery cell, V1 / V2, is in the range of 4%-25%.
2. The unit cell of claim 1, wherein, An electrode post (120) is provided on the first wall (110). Along the length direction of the single cell, the accommodating cavity (20) faces the electrode post (120) on one side, and the distance D between the cavity (20) and the electrode post (120) is 18mm-70mm.
3. The unit cell of claim 2, wherein, The electrode (120) includes a positive electrode and a negative electrode, and the accommodating cavity (20) is centrally located between the positive electrode and the negative electrode.
4. The single-cell battery as described in claim 1, characterized in that, The accommodating cavity (20) includes at least a first accommodating cavity (210) and a second accommodating cavity (220) spaced apart. Along the length direction of the single cell, the interval H between the first accommodating cavity (210) and the second accommodating cavity (220) is 8mm-30mm.
5. The cell of claim 1 wherein, The accommodating cavity (20) is a protruding structure based on the first wall (110) in the non-expanded state, or the accommodating cavity (20) is flush with the first wall (110) in the non-expanded state.
6. The cell of claim 1 wherein, The accommodating cavity (20) includes a top plate (230) and a side connecting part (240). The side connecting part (240) is an elastic structure that can be deformed and restored and is circumferentially closed. The two ends of the side connecting part (240) on the normal line of the first wall (110) are respectively fixed to the first wall (110) and the top plate (230).
7. The unit cell of claim 6, wherein, The side connection portion (240) includes a flexible sealing layer (2410), which is a hollow structure in its thickness direction. Multiple springs (2420) are disposed within the hollow structure of the sealing layer (2410). The two ends of each spring (2420) are fixed to the first wall (110) and the top plate (230), respectively. The springs (2420) are normally in a contracted state, or... The side connection part (240) is an integral structure made of elastic material that can deform and recover.
8. The cell of claim 1 wherein, An explosion-proof valve (30) is provided on the accommodating cavity (20). The explosion-proof valve (30) is based on the recessed area of the top wall of the accommodating cavity (20) and is centrally located on the top wall of the accommodating cavity (20).
9. The cell of claim 1 wherein, An explosion-proof valve is provided on the first wall, and the distance M between the explosion-proof valve and the accommodating cavity (20) is 5mm-25mm.
10. The cell of claim 1 wherein, The accommodating cavity (20) is 3mm-30mm away from the edge of the first wall (110) in the width direction of the housing (10).
11. The single-cell battery as described in claim 1, characterized in that, The projection of the accommodating cavity (20) onto the first wall (110) is rectangular, circular, waist-shaped or trapezoidal.
12. A battery pack, characterized by It includes multiple single-cell batteries as described in any one of claims 1-11.
13. The battery pack of claim 12, wherein, The accommodating cavities (20) of the at least two single batteries are protruded towards the same direction.