battery

Abstract

The application discloses a battery, and relates to the technical field of batteries. The battery comprises a battery cell and a cooling piece. The battery cell has a flat area and two corner areas. The two corner areas are respectively located at two ends of the flat area along the width direction of the battery cell. The cooling piece comprises a first cooling component and a second cooling component which are connected with each other. The first cooling component is used for cooling the flat area, and the second cooling component is used for cooling at least one of the two corner areas. The temperature of the flat area is cooled by the first cooling component, and the temperature of the corner area is cooled by the second cooling component. The cooling efficiency of the battery cell is improved, and the equalization effect of the battery temperature is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery. Background Technology

[0002] During charging and discharging, uneven heat distribution can easily occur inside the battery, causing localized overheating. Localized high temperatures not only degrade battery performance and reduce charging and discharging efficiency, but also accelerate electrode material aging, reduce electrolyte stability, and shorten battery cycle life. In extreme cases, localized overheating may trigger thermal runaway, threatening battery safety. Currently, although built-in heat spreaders are used to balance the internal temperature of the battery, the balancing effect is unsatisfactory. Utility Model Content

[0003] Embodiments of this application provide a battery that at least partially solves the above-mentioned technical problems.

[0004] An embodiment of this application provides a battery including a cell and a cooling component. The cell has a flat region and two corner regions. Along the width direction of the cell, the two corner regions are located at opposite ends of the flat region. The cooling component includes a first cooling component and a second cooling component connected to each other. The first cooling component is used to cool the flat region, and the second cooling component is used to cool at least one of the two corner regions.

[0005] In one possible implementation, at least a portion of the second cooling component contacts the corner area; and / or, at least a portion of the first cooling component contacts the straight area.

[0006] In one possible implementation, the second cooling component contacts the corner area surface; and / or, the first cooling component contacts the straight area surface.

[0007] In one possible implementation, both the second cooling component and the first cooling component are plates, with the second cooling component perpendicular to the first cooling component.

[0008] In one possible implementation, the second cooling component is bent and connected to the first cooling component.

[0009] In one possible implementation, the second cooling component has a contoured surface corresponding to the corner area, the contoured surface being fitted to the corner area.

[0010] In one possible implementation, the first cooling component has a first cooling channel for the flow of cooling medium, and the second cooling component has a second cooling channel for the flow of cooling medium, with the first cooling channel and the second cooling channel in communication.

[0011] In one possible implementation, the battery further includes a baffle located between the first cooling channel and the second cooling channel, and configured to guide the cooling medium to flow between the first cooling channel and the second cooling channel.

[0012] In one possible implementation, the battery includes an adjacent first cell and a second cell, with the cooling element located between the first cell and the second cell.

[0013] In one possible implementation, the first cell includes a first flat area, a first corner area, and a second corner area, with the first corner area and the second corner area located at opposite ends of the first flat area along the width direction of the first cell.

[0014] The second battery cell includes a second straight area, a third corner area, and a fourth corner area. Along the width direction of the second battery cell, the third corner area and the fourth corner area are located at both ends of the second straight area.

[0015] The second cooling component includes a first sub-cooling component, a second sub-cooling component, a third sub-cooling component, and a fourth sub-cooling component. The first and second sub-cooling components are located at one end of the width direction of the first cooling component, and the third and fourth sub-cooling components are located at the other end of the width direction of the first cooling component. The first sub-cooling component is used to cool the first corner area, the third sub-cooling component is used to cool the second corner area, the second sub-cooling component is used to cool the third corner area, and the fourth sub-cooling component is used to cool the fourth corner area.

[0016] In one possible implementation, both the first sub-cooling component and the second sub-cooling component are bent and connected to the first cooling component;

[0017] And / or, both the third sub-cooling component and the fourth sub-cooling component are bent and connected to the first cooling component.

[0018] In one possible implementation, the cooling element covers the outer periphery of the battery cell.

[0019] The beneficial effects of the embodiments of this application are as follows:

[0020] In the embodiments of this application, by setting a first cooling component to cool the flat area and setting a second cooling component to cool the corner area, the cooling efficiency of the cell is improved, thereby improving the temperature balance of the battery. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 Schematic diagrams of the battery structure provided for some embodiments of this application;

[0023] Figure 2 Cross-sectional views of a battery provided for some embodiments of this application;

[0024] Figure 3 Cross-sectional views of a battery cell provided for some embodiments of this application;

[0025] Figure 4 Schematic diagrams of the cooling components provided for some embodiments of this application;

[0026] Figure 5 Exploded view of the battery structure provided for some embodiments of this application;

[0027] Figure 6 Schematic diagrams of the battery structure provided for other embodiments of this application;

[0028] Figure 7 Cross-sectional views of a battery provided for other embodiments of this application;

[0029] Figure 8 Schematic diagrams of the cooling components provided in other embodiments of this application;

[0030] Figure 9 for Figure 7 Enlarged view of part A in the middle.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100-battery;

[0033] 10-Battery cell; 11-Corner area; 12-Straight area;

[0034] 20 - Cooling component; 21 - First cooling component; 22 - Second cooling component; 221 - First sub-cooling component; 222 - Second sub-cooling component; 223 - Third sub-cooling component; 224 - Fourth sub-cooling component; 23 - First cooling channel; 24 - Second cooling channel;

[0035] 30 - First cell; 31 - First corner area; 32 - Second corner area; 33 - First straight area;

[0036] 40 - Second cell; 41 - Third corner area; 42 - Fourth corner area; 43 - Second straight area;

[0037] 50 - spoiler; X - width direction. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0039] The corner areas of wound-type battery cells are prone to uneven current distribution due to bending, easily forming localized hot spots. The heat from these hot spots cannot be dissipated in time, potentially leading to thermal runaway. Currently, the heat spreaders inside the battery do not cover the corner areas, resulting in ineffective cooling and poor temperature balance within the battery.

[0040] Therefore, embodiments of this application provide a battery 100.

[0041] Reference Figures 1 to 4 , Figure 1 Schematic diagrams of the structure of the battery 100 provided for some embodiments of this application; Figure 2 Cross-sectional views of a battery 100 provided for some embodiments of this application; Figure 3 Cross-sectional views of the battery cell 10 provided for some embodiments of this application; Figure 4 The diagram below illustrates the structure of a cooling element 20 according to some embodiments of this application. The battery 100 includes a cell 10 and a cooling element 20. The cell 10 has a flat region 12 and two corner regions 11. Along the width direction X of the cell 10, the two corner regions 11 are located at opposite ends of the flat region 12. The cooling element 20 includes a first cooling component 21 and a second cooling component 22 connected to each other. The first cooling component 21 cools the flat region 12, and the second cooling component 22 cools at least one of the two corner regions 11.

[0042] A wound battery cell is typically made by winding stacked positive and negative electrode sheets around a spool. The straight region 12 is the area where the electrode sheets are arranged in a straight line and have a regular and uniform structure. The straight region 12 is part of the main body of the battery cell 10. The corner region 11 is located at both ends of the straight region 12 and is the area where the electrode sheets bend and turn.

[0043] The first cooling component 21 corresponds to the position of the flat area 12 of the battery cell 10, thereby cooling the flat area 12; the second cooling component 22 corresponds to the position of the corner area 11 of the battery cell 10, thereby cooling the corner area 11.

[0044] For example, the second cooling component 22 is used to cool the two corner areas 11 of the battery cell 10.

[0045] For example, the cooling element 20 is clamped between two adjacent cells 10 so that it can cool the corner area 11 of the two cells 10 at the same time. This arrangement helps to reduce the number of cooling components.

[0046] For example, the battery cell 10 is flat.

[0047] In this embodiment, by setting a first cooling component 21 to cool the flat area 12 and setting a second cooling component 22 to cool the corner area 11, the cooling efficiency of the cell 10 is improved, thereby improving the temperature balance of the battery 100.

[0048] The cooling component 20 can indirectly cool the battery cell 10 by cooling the electrolyte around the battery cell 10, or it can directly cool the battery cell 10 by contacting it, thereby improving the cooling efficiency.

[0049] In some embodiments, at least a portion of the second cooling component 22 contacts the corner area 11.

[0050] In some embodiments, at least a portion of the first cooling component 21 contacts the flat region 12.

[0051] In some embodiments, in order to further improve the cooling efficiency of the corner area 11, the second cooling component 22 is in contact with the surface of the corner area 11.

[0052] In some embodiments, in order to further improve the cooling efficiency of the flat region 12, the first cooling component 21 is in contact with the surface of the flat region 12.

[0053] Reference Figure 5 , Figure 5 The exploded view of the battery 100 provided for some embodiments of this application shows that in some embodiments, the cooling element 20 covers the outer periphery of the cell 10, thereby achieving cooling of the straight area 12 and the corner area 11.

[0054] In some embodiments, refer to Figure 5 Along the height direction of the battery 100, the cooling component 20 has a first opening at the top and a second opening at the bottom. The second opening facilitates the assembly of the cooling component 20 with the battery cell 10, and the first opening is used to expose the tabs of the battery cell 10.

[0055] In other embodiments, the cooling element 20 has an opening at the top along the height direction of the battery 100, which allows the tabs of the battery cell 10 to be exposed, while the bottom is closed to achieve cooling of the bottom of the battery cell 10.

[0056] In some embodiments, the cooling element 20 is made of a flexible material so that the cooling element 20 fits tightly against the sidewall of the battery cell 10, thereby improving cooling efficiency.

[0057] In some embodiments, the base material of the cooling element 20 is copper. Because copper has high thermal conductivity and flexibility, the cooling element 20 prepared from it can effectively improve cooling efficiency.

[0058] Reference Figure 4 In some embodiments, both the second cooling component 22 and the first cooling component 21 are plates, with the second cooling component 22 perpendicular to the first cooling component 21.

[0059] In one example, the second cooling component 22 includes two sub-cooling components spaced apart along the width direction X of the battery 100. One end of the first cooling component 21 is connected to one of the two sub-cooling components, and the other end is connected to the other of the two sub-cooling components. Each sub-cooling component corresponds to a corner of the cell 10.

[0060] The first cooling component 21 can be integrally formed, or it can be prepared separately and then fixedly connected together.

[0061] For example, the first cooling component 21 is welded to the second cooling component 22.

[0062] In some embodiments, the second cooling component 22 is bent and connected to the first cooling component 21. This arrangement can alleviate stress concentration at the connection between the first cooling component 21 and the second cooling component 22, and can bring the connection between the first cooling component 21 and the second cooling component 22 closer to the battery cell 10, thereby improving cooling efficiency.

[0063] Reference Figures 6 to 8 , Figure 6 Schematic diagrams of the structure of the battery 100 provided for other embodiments of this application; Figure 7 A cross-sectional view of the battery 100 provided for other embodiments of this application; Figure 8 This is a schematic diagram of the structure of the cooling component 20 provided for other embodiments of this application. In some embodiments, the second cooling component 22 has a contoured surface corresponding to the corner area 11, and the contoured surface fits into the corner area 11.

[0064] In some embodiments, the second cooling component 22 is a contour patch. It can be understood that the second cooling component 22 is an arc-shaped plate adapted to the corner area 11.

[0065] In some embodiments, the first cooling component 21 is a flat plate, and the second cooling component 22 is an arc-shaped plate.

[0066] In some embodiments, the second cooling component 22 has the same thickness as the first cooling component 21.

[0067] In some embodiments, the cooling element 20 has a hollow cavity containing a cooling medium.

[0068] In some embodiments, the cooling element 20 is provided with a mesh material capable of capillary adsorption of the cooling medium. The cooling medium absorbs heat and vaporizes, thereby flowing rapidly within the cavity and equalizing the temperature of the battery 100.

[0069] In some embodiments, a support structure is provided inside the cooling component 20 to prevent deformation of the cooling component 20.

[0070] Reference Figure 9 , Figure 9 for Figure 7 In the enlarged view of part A, in some embodiments, the first cooling component 21 has a first cooling channel 23 for the flow of cooling medium, and the second cooling component 22 has a second cooling channel 24 for the flow of cooling medium. The first cooling channel 23 and the second cooling channel 24 are connected.

[0071] In this embodiment, connecting the first cooling channel 23 and the second cooling channel 24 can optimize the flow of the cooling medium, avoid poor flow and dead zones, improve the utilization rate of the cooling medium, and thus balance the temperature of the cooling component 20.

[0072] Reference Figure 9 In some embodiments, the battery 100 further includes a baffle 50 located between the first cooling channel 23 and the second cooling channel 24, configured to guide the flow of cooling medium between the first cooling channel 23 and the second cooling channel 24.

[0073] It is understood that the baffle 50 is used to guide the flow of the cooling medium between the first cooling channel 23 and the second cooling channel 24.

[0074] In some embodiments, the first cooling channel 23 and the second cooling channel 24 are connected by a transition channel, and a baffle 50 is disposed in the transition channel. Multiple baffles 50 are disposed at intervals, dividing the transition channel into multiple sub-channels, each sub-channel connecting the first cooling channel 23 and the second cooling channel 24.

[0075] For example, four spoilers 50 are provided, and the four spoilers 50 divide the transition channel into five sub-channels.

[0076] Since the cooling medium needs to turn between the first cooling channel 23 and the second cooling channel 24, eddies are prone to occur at the turning points, which reduces the fluidity of the cooling medium. In this embodiment, by setting the baffle 50, the eddies at the turning points can be reduced and the fluidity of the cooling medium can be increased.

[0077] In some embodiments, the baffle 50 is fixedly connected to the housing of the cooling component 20, and the baffle 50 can support the housing of the cooling component 20, reducing the risk of deformation of the cooling component 20.

[0078] Reference Figure 6 and Figure 7 In some embodiments, the battery 100 includes adjacent first cell 30 and second cell 40, with a cooling element 20 located between the first cell 30 and the second cell 40. It is understood that the cooling element 20 can simultaneously cool the first cell 30 and the second cell 40.

[0079] Specifically, the first cooling component 21 is located between the first battery cell 30 and the second battery cell 40, and the second cooling component 22 is located outside the corner area 11 of the battery cell 10.

[0080] In some embodiments, the first battery cell 30 includes a first flat region 33, a first corner region 31, and a second corner region 32. Along the width direction X of the first battery cell 30, the first corner region 31 and the second corner region 32 are located at the two ends of the first flat region 33, respectively.

[0081] The second battery cell 40 includes a second straight region 43, a third corner region 41, and a fourth corner region 42. Along the width direction X of the second battery cell 40, the third corner region 41 and the fourth corner region 42 are located at both ends of the second straight region 43, respectively.

[0082] The second cooling component 22 includes a first sub-cooling component 221, a second sub-cooling component 222, a third sub-cooling component 223, and a fourth sub-cooling component 224. The first sub-cooling component 221 and the second sub-cooling component 222 are located at one end of the width direction X of the first cooling component 21, and the third sub-cooling component 223 and the fourth sub-cooling component 224 are located at the other end of the width direction X of the first cooling component 21. The first sub-cooling component 221 is used to cool the first corner area 31, the third sub-cooling component 223 is used to cool the second corner area 32, the second sub-cooling component 222 is used to cool the third corner area 41, and the fourth sub-cooling component 224 is used to cool the fourth corner area 42.

[0083] Specifically, a first receiving space for accommodating the first battery cell 30 is defined between the first sub-cooling component 221 and the third sub-cooling component 223, and a second receiving space for accommodating the second battery cell 40 is defined between the second sub-cooling component 222 and the fourth sub-cooling component 224. The first battery cell 30 is sandwiched between the first sub-cooling component 221 and the third sub-cooling component 223, and the second battery cell 40 is sandwiched between the second sub-cooling component 222 and the fourth sub-cooling component 224. This arrangement can cool the corner areas 11 of the first battery cell 30 and the second battery cell 40, restrict the movement of the battery cell 10 along the width direction X of the battery 100, improve the structural stability of the battery 100, and reduce the risk of explosion caused by punctures to the corner areas 11 of the first battery cell 30 and the second battery cell 40.

[0084] In some embodiments, the first sub-cooling component 221 and the second sub-cooling component 222 are both bent and connected to the first cooling component 21;

[0085] In some embodiments, the third sub-cooling component 223 and the fourth sub-cooling component 224 are both bent and connected to the first cooling component 21.

[0086] In one example, the first sub-cooling component 221, the second sub-cooling component 222, the third sub-cooling component 223, and the fourth sub-cooling component 224 are all contoured patches.

[0087] In some embodiments, the battery 100 further includes a housing, in which the battery cell 10 and the cooling element 20 are disposed.

[0088] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0089] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0090] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0091] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery, characterized in that, include: The battery cell has a flat region and two corner regions, with the two corner regions located at opposite ends of the flat region along the width direction of the battery cell. The cooling component includes a first cooling component and a second cooling component connected to each other, the first cooling component being used to cool the straight area and the second cooling component being used to cool at least one of the two corner areas.

2. The battery according to claim 1, characterized in that, At least a portion of the second cooling component contacts the corner area; and / or, At least a portion of the first cooling component is in contact with the flat area.

3. The battery according to claim 1, characterized in that, The second cooling component is in contact with the corner area surface; and / or, The first cooling component is in contact with the flat area surface.

4. The battery according to claim 1, characterized in that, Both the second cooling component and the first cooling component are plates, with the second cooling component perpendicular to the first cooling component.

5. The battery according to claim 4, characterized in that, The second cooling component is bent and connected to the first cooling component.

6. The battery according to claim 1, characterized in that, The second cooling component has a contoured surface corresponding to the corner area, and the contoured surface fits the corner area.

7. The battery according to any one of claims 1-6, characterized in that, The first cooling component has a first cooling channel for the flow of cooling medium inside, and the second cooling component has a second cooling channel for the flow of cooling medium inside, with the first cooling channel and the second cooling channel connected together.

8. The battery according to claim 7, characterized in that, The battery also includes: A baffle plate is located between the first cooling channel and the second cooling channel and is configured to guide the cooling medium to flow between the first cooling channel and the second cooling channel.

9. The battery according to claim 1, characterized in that, The battery includes an adjacent first cell and a second cell, and the cooling element is located between the first cell and the second cell.

10. The battery according to claim 9, characterized in that, The first battery cell includes a first straight area, a first corner area, and a second corner area. Along the width direction of the first battery cell, the first corner area and the second corner area are located at both ends of the first straight area. The second battery cell includes a second straight area, a third corner area, and a fourth corner area. Along the width direction of the second battery cell, the third corner area and the fourth corner area are located at both ends of the second straight area. The second cooling component includes a first sub-cooling component, a second sub-cooling component, a third sub-cooling component, and a fourth sub-cooling component. The first and second sub-cooling components are located at one end of the width direction of the first cooling component, and the third and fourth sub-cooling components are located at the other end of the width direction of the first cooling component. The first sub-cooling component is used to cool the first corner area, the third sub-cooling component is used to cool the second corner area, the second sub-cooling component is used to cool the third corner area, and the fourth sub-cooling component is used to cool the fourth corner area.

11. The battery according to claim 10, characterized in that, Both the first sub-cooling component and the second sub-cooling component are bent and connected to the first cooling component; And / or, both the third sub-cooling component and the fourth sub-cooling component are bent and connected to the first cooling component.

12. The battery according to claim 1, characterized in that, The cooling element covers the outer periphery of the battery cell.

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