Battery pack and electric device
By designing the battery cells and housing cavity differently, the performance degradation and thermal management risks of the battery pack under high temperature environments are solved, thereby improving safety and economy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAOMI EV TECH CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-07-17
AI Technical Summary
The high temperatures generated by heat-generating components around the battery pack lead to reduced performance of individual battery cells and increased thermal management risks, which are difficult to effectively address with existing technologies.
The battery cells employ a differentiated design, with the first battery cell, which performs better in high-temperature environments, located near the heat-generating components, and the second battery cell located away from the heat-generating components. Through the housing cavity design and the separation of internal beams, independent sub-chambers are formed to block heat transfer and manage the battery cells.
It effectively reduces the performance risks caused by heat-generating components, improves safety and overall battery pack performance under high-temperature conditions, reduces the design requirements of thermal management and insulation systems, and improves the safety and economy of use.
Smart Images
Figure CN224520034U_ABST
Abstract
Claims
1. A battery pack, characterized in that, include: First battery cell; Second battery cell; as well as The housing has a clearance portion for adjacent to heat-generating components other than the battery pack. The housing has a receiving cavity with multiple receiving areas, including a first receiving area and a second receiving area. The first receiving area is arranged adjacent to the clearance portion, and the second receiving area is located on the side of the first receiving area away from the clearance portion. The first receiving area is used to house the first battery cell, and the second receiving area is used to house the second battery cell. The capacity retention rate and / or DCR growth rate of the first battery cell in the high-temperature cycling test are greater than the corresponding capacity retention rate and / or DCR growth rate of the second battery cell.
2. The battery pack of claim 1, wherein, The receiving cavity is divided into multiple sub-chambers by internal beams, and each receiving area corresponds to at least one of the sub-chambers.
3. The battery pack of claim 2, wherein, The plurality of sub-chambers includes a first sub-chamber corresponding to the first accommodating area and a second sub-chamber corresponding to the second accommodating area. Along a first direction, the first sub-chamber is located between the second sub-chamber and the clearance portion.
4. The battery pack of claim 3, wherein, The size of the first sub-chamber in the first direction is smaller than the size of the second sub-chamber in the first direction.
5. The battery pack of claim 3, wherein, The ratio of the volume of the first sub-chamber to the volume of the second sub-chamber is 0.33 to 3.
6. The battery pack of claim 3, wherein, The internal beam includes a middle beam separating the first sub-chamber and the second sub-chamber. The middle beam extends along a second direction. The sidewall with the largest area of the first battery cell is perpendicular to the first direction, and the sidewall with the largest area of the second battery cell is perpendicular to the first direction. The first battery cell and the second battery cell can directly or indirectly abut against the middle beam.
7. The battery pack of claim 3, wherein, Each of the first battery cells in the first sub-chamber is electrically connected to form a first battery pack, and / or each of the second battery cells in the second sub-chamber is electrically connected to form a second battery pack, wherein the first battery pack is connected in series or in parallel to the second battery pack.
8. The battery pack according to claim 7, characterized in that, The battery pack further includes a first heat exchange component that exchanges heat with the first battery pack and a second heat exchange component that exchanges heat with the second battery pack. The first heat exchange component has a first heat exchange channel and a first liquid inlet and a first liquid outlet that are both connected to the first heat exchange channel. The second heat exchange component has a second heat exchange channel and a second liquid inlet and a second liquid outlet that are both connected to the second heat exchange channel.
9. The battery pack according to claim 1, characterized in that, The area of the first accommodating region is smaller than the area of the second accommodating region; and / or, The number of first containment areas is at least one, the number of second containment areas is at least one, and the total area of each of the first containment areas is less than the total area of each of the second containment areas.
10. The battery pack of claim 1, wherein, The first battery cell and the second battery cell have different chemical systems.
11. The battery pack of claim 10, wherein, The first battery cell is one of the following: lithium iron phosphate cell, ternary lithium cell, high manganese lithium iron phosphate cell, quaternary lithium cell, cobalt-free cell, lithium manganese oxide cell, nickel-metal hydride cell, and lithium titanate cell. The second battery cell is another one of lithium iron phosphate cell, ternary lithium cell, high manganese lithium iron phosphate cell, quaternary lithium cell, cobalt-free cell, lithium manganese oxide cell, nickel-metal hydride cell, and lithium titanate cell.
12. The battery pack of claim 1, wherein, The housing includes a lower housing and an upper housing, which are connected to form the receiving cavity. One of the upper housing and the lower housing is provided with the clearance portion, which includes a main body and clearance grooves and / or clearance channels formed on the main body.
13. The battery pack of claim 12, wherein, The housing includes a second sidewall, the main body is connected to the second sidewall, the clearance groove and / or clearance channel extend in the same direction as the second sidewall, and the first accommodating area is arranged adjacent to the second sidewall.
14. An electrical device, characterized by Includes the battery pack described in any one of claims 1-13.
15. The powered device of claim 14, wherein, The electrical equipment includes a vehicle, the vehicle includes the heat-generating component, and the heat-generating component includes an exhaust pipe and / or oil pipe connected to the engine.