Cylindrical battery and battery pack

Abstract

The invention discloses a cylindrical battery and a battery pack, and belongs to the technical field of battery packs. The cylindrical battery comprises a battery cell; the shell surrounds the periphery of the battery cell, a cooling cavity is formed in the shell, and the cooling cavity is arranged in the circumferential direction of the shell; the partition columns are arranged in the cooling cavity so as to divide the cooling cavity into a plurality of sub-cooling cavities, at least one through hole is formed in each partition column, and every two adjacent sub-cooling cavities are communicated through the corresponding through hole.

Description

Technical Field

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

[0002] Cylindrical batteries, as an important form of battery packaging, have advantages such as high standardization and mature technology. A cylindrical battery consists of a cylindrical casing and cylindrical cells housed within the casing.

[0003] In related technologies, the casing of cylindrical batteries is usually a single-layer metal casing, which supports and encapsulates the battery cell.

[0004] However, the single-layer metal casing cannot effectively conduct heat inside the battery cell, resulting in uneven temperature distribution within the cell and affecting its lifespan and safety. Summary of the Invention

[0005] This application discloses a cylindrical battery and battery pack to solve, or at least partially solve, the problem in the prior art where a single-layer metal casing cannot effectively conduct heat inside the battery cell, resulting in uneven temperature distribution within the battery cell and affecting its lifespan and safety.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, this application discloses a cylindrical battery, the cylindrical battery comprising a cell; a housing surrounding the outer periphery of the cell, the housing having a cooling cavity disposed within the housing along the circumferential direction of the housing; and a partition post disposed within the cooling cavity to divide the cooling cavity into multiple sub-cooling cavities, the partition post having at least one through hole communicating with two adjacent sub-cooling cavities.

[0007] In some embodiments, the partition post is arranged circumferentially along the housing, and the through holes include a plurality of through holes, which are arranged at intervals on the partition post circumferentially along the housing.

[0008] In some embodiments, the partition posts include a plurality of partition posts, which are arranged at intervals along the radial and / or axial direction of the housing.

[0009] In some embodiments, the housing includes a first sub-shell and a second sub-shell, the first sub-shell being located on the side away from the battery cell, and the second sub-shell being located on the side closer to the battery cell, the first sub-shell and the second sub-shell forming the cooling cavity; the first sub-shell is provided with a liquid injection hole, the liquid injection hole being connected to the cooling cavity, and the liquid injection hole being used to inject coolant into the cooling cavity.

[0010] In some embodiments, the first sub-shell and / or the second sub-shell are provided with a drain hole, the drain hole being connected to the cooling chamber and used to drain the coolant in the cooling chamber.

[0011] In some embodiments, the drain hole includes a first drain hole disposed on the first sub-shell and communicating with the cooling cavity; the cylindrical battery further includes a first sealing plate detachably connected to the first drain hole.

[0012] In some embodiments, along the axial direction of the housing, the housing has a first end and a second end disposed opposite to each other, and the first drain hole includes a plurality of first drain holes, some of which are spaced apart at the position of the first end of the housing, and other portions of the first drain holes are spaced apart at the position of the sidewall of the housing near the first end of the housing.

[0013] In some embodiments, the first drain hole disposed on the side wall of the housing has a first opening away from the cooling chamber and a second opening close to the cooling chamber; along the axial direction of the housing, the height of the first opening is lower than the height of the second opening.

[0014] In some embodiments, the drain hole further includes a second drain hole, which is disposed on the second sub-shell and communicates with the cooling cavity; the cylindrical battery further includes a second sealing plate, which is detachably connected to the second drain hole, and the second sealing plate is a thermosensitive sealing plate.

[0015] In some embodiments, the thermosensitive sealing sheet includes at least one of a thermosensitive ceramic sealing sheet and a thermosensitive plastic sealing sheet.

[0016] Secondly, this application also discloses a battery pack, the battery pack including a housing; and the cylindrical battery described in the first aspect, the cylindrical battery being disposed within the housing.

[0017] This application discloses a cylindrical battery and a battery pack. The cylindrical battery includes a cell; a housing surrounding the outer periphery of the cell, and a cooling cavity provided inside the housing, the cooling cavity being arranged circumferentially around the housing; and a partition post disposed within the cooling cavity to divide the cooling cavity into multiple sub-cooling cavities, the partition post having at least one through hole communicating with two adjacent sub-cooling cavities.

[0018] The cylindrical battery disclosed in this application includes a cell and a casing surrounding the cell. The casing supports and encapsulates the cell, thereby improving the reliability of the cylindrical battery. A cooling chamber is provided inside the casing, arranged circumferentially around the casing, to cool the cell with coolant within the cooling chamber, resulting in a more uniform temperature distribution within the cell and thus improving the cell's lifespan and safety.

[0019] Furthermore, in this application, a partition column is provided within the cooling chamber to divide it into multiple sub-cooling chambers. The partition column slows down the flow rate of the coolant, reduces the impact of the coolant on the battery cell, and improves the reliability of the cylindrical battery. Each partition column has at least one through-hole connecting two adjacent sub-cooling chambers, allowing the coolant to fill all sub-cooling chambers, ensuring effective cooling of all parts of the cylindrical battery and resulting in a more uniform cell temperature. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cylindrical battery structure described in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the housing described in the embodiments of this application; Figure 3 This is a cross-sectional view of the housing described in an embodiment of this application; Figure 4 express Figure 3 A magnified view of a portion of the image; Figure 5 express Figure 3 Enlarged view of part B; Figure 6 express Figure 3 A magnified view of a portion of the image, C; Figure 7 This is a schematic diagram of the structure of the housing described in another embodiment of this application; Figure 8 This represents a cross-sectional view of the housing described in another embodiment of this application; Figure 9 express Figure 8 A magnified view of part D; Figure 10 express Figure 8 A magnified view of a portion of the image, E.

[0021] Figure label: 10: Battery cells; 20: Shell; 21: Cooling chamber; 211: Sub-cooling chamber; 22: First sub-shell; 221: Injection hole; 222: First drain hole; 2221: First opening; 2222: Second opening; 23: Second sub-shell; 231: Second drain hole; 30: Separator column; 31: Through hole. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0024] This application discloses a cylindrical battery, which includes a cell 10; a housing 20 surrounding the outer periphery of the cell 10, and a cooling cavity 21 disposed within the housing 20 along the circumference of the housing 20; and a partition post 30 disposed within the cooling cavity 21 to divide the cooling cavity 21 into multiple sub-cooling cavities 211, with at least one through hole 31 on the partition post 30, the through hole 31 connecting two adjacent sub-cooling cavities 211.

[0025] like Figure 1 As shown in the illustration, this application discloses a cylindrical battery, which refers to a battery with a cylindrical structure. The cylindrical battery includes a cell 10 and a casing 20. The cell 10, as the core component of the cylindrical battery, stores and releases electrical energy through an electrochemical reaction. The cell 10 is also typically cylindrical. The cell 10 is disposed within the casing 20, meaning the casing 20 surrounds the outer periphery of the cell 10, supporting and encapsulating it to improve the reliability of the cylindrical battery. It should be noted that the casing 20 in this application embodiment can be an aluminum casing, a steel casing, or an alloy casing. In this application embodiment, no specific restrictions are placed on the material of the casing 20. In practical applications, those skilled in the art can select appropriate materials to form the casing 20 as needed.

[0026] like Figure 4 As shown, a cooling chamber 21 is provided within the housing 20, which is used to store coolant. This coolant includes, but is not limited to, ethylene glycol-based coolant, propylene glycol-based coolant, etc. In this embodiment, no particular restrictions are placed on the specific type of coolant stored in the cooling chamber 21. In practical applications, those skilled in the art can select according to their needs.

[0027] The cooling chamber 21 is arranged circumferentially around the housing 20, meaning it surrounds the outer periphery of the battery cell 10. The coolant within the cooling chamber 21 cools the battery cell 10, reducing its temperature and resulting in a more even temperature distribution, thereby improving its lifespan and safety. Figure 4 As shown, the cylindrical battery disclosed in this application embodiment also includes a separator 30, which is disposed within the cooling cavity 21 to divide the cooling cavity 21 into multiple sub-cooling cavities 211. This reduces the flow rate of the coolant in the cooling cavity 21, decreases the impact of the coolant on the cell 10, and improves the reliability of the cylindrical battery.

[0028] For example, the partition posts 30 include a plurality of partition posts 30 extending axially along the cylindrical battery and spaced apart circumferentially along the cylindrical battery to divide the cooling cavity 21 into a plurality of sub-cooling cavities 211 spaced apart circumferentially along the cylindrical battery. Alternatively, the partition posts 30 include a plurality of partition posts 30, each extending circumferentially along the cylindrical battery and spaced apart axially along the cylindrical battery to divide the cooling cavity 21 into a plurality of sub-cooling cavities 211 spaced apart axially along the cylindrical battery.

[0029] Of course, the above are merely individual examples of specific partitioning methods for the cooling chamber 21 and are not intended to limit this application. In practical applications, technicians can also configure the partitioning method of the cooling chamber 21 as needed.

[0030] It should be noted that the partition column 30 in this embodiment can be a cuboid, a cylinder, or a hexagon. In this embodiment, no specific restrictions are placed on the specific structure of the partition column 30. In practical applications, those skilled in the art can configure it as needed.

[0031] like Figure 4 As shown, the separator column 30 is provided with at least one through hole 31 to connect two adjacent sub-cooling chambers 211, allowing coolant in one sub-cooling chamber 211 to flow into the adjacent sub-cooling chamber 211 through the through hole 31. This allows the coolant to fill multiple sub-cooling chambers 211, ensuring a more balanced cooling effect across the various parts of the cell 10, resulting in a more uniform temperature of the cell 10, thereby improving the lifespan and safety of the cylindrical battery.

[0032] In this embodiment, a partition column 30 is provided within the cooling cavity 21, dividing the cooling cavity 21 into multiple sub-cooling cavities 211. The partition column 30 reduces the flow rate of the coolant in the cooling cavity 21, decreasing the impact of the coolant on the battery cell 10, thereby improving the reliability of the cylindrical battery. The partition column 30 is provided with at least one through hole 31, connecting two adjacent sub-cooling cavities 211. This allows the coolant to fill multiple sub-cooling cavities 211, ensuring a more balanced cooling effect across the battery cell 10 and a more uniform temperature throughout the battery cell 10, thus improving the lifespan and safety of the cylindrical battery.

[0033] In some embodiments, such as Figures 4 to 6 As shown, the partition column 30 is arranged along the circumference of the housing 20, and the through hole 31 includes a plurality of through holes 31, which are arranged at intervals along the circumference of the housing 20 on the partition column 30.

[0034] like Figures 4 to 6 As shown in the embodiment of this application, the separator 30 is arranged circumferentially around the housing 20. It can be understood that the separator 30 surrounds the outer periphery of the cell 10 in the circumferential direction, thereby dividing the cooling cavity 21 into a plurality of sub-cooling cavities 211 arranged at intervals in the axial direction and / or radial direction of the cell 10. The separator 30 reduces the flow rate of the coolant in the cooling cavity 21, thereby reducing the impact of the coolant on the cell 10 and improving the reliability of the cylindrical battery.

[0035] Each partition post 30 is provided with multiple through holes 31, which are spaced apart circumferentially on the housing 20. This allows coolant in one sub-cooling chamber 211 to flow into an adjacent sub-cooling chamber 211 through the multiple through holes 31. This ensures that the coolant can fill multiple sub-cooling chambers 211, guaranteeing a more balanced cooling effect across all parts of the cell 10, resulting in a more uniform temperature of the cell 10, thereby improving the lifespan and safety of the cylindrical battery.

[0036] For example, each partition post 30 is provided with two through holes 31, which are spaced apart circumferentially on the housing 20. Alternatively, each partition post 30 is provided with three through holes 31, which are spaced apart circumferentially on the housing 20. Or, each partition post 30 is provided with four through holes 31, which are spaced apart circumferentially on the housing 20. Of course, the above are only individual examples of the specific number of through holes 31 and are not intended to limit this application. In practical applications, those skilled in the art can determine the specific number of through holes 31 provided on each partition post 30 as needed.

[0037] In some embodiments, such as Figures 4 to 6 As shown, the partition column 30 includes a plurality of partition columns 30, which are arranged at intervals along the radial and / or axial direction of the housing 20.

[0038] like Figures 4 to 6 As shown in this embodiment, a plurality of partition columns 30 are provided within the cooling cavity 21, and the partition columns 30 are spaced apart in the radial and / or circumferential directions of the housing 20. Exemplarily, the plurality of partition columns 30 within the cooling cavity 21 are spaced apart in the radial direction of the housing 20 to divide the cooling cavity 21 into a plurality of sub-cooling cavities 211 spaced apart in the radial direction of the housing 20. Alternatively, the plurality of partition columns 30 within the cooling cavity 21 are spaced apart in the axial direction of the housing 20 to divide the cooling cavity 21 into a plurality of sub-cooling cavities 211 spaced apart in the axial direction of the housing 20. Alternatively, the partition columns 30 may comprise a plurality, with some partition columns 30 spaced apart in the radial direction of the housing 20 within the cooling cavity 21, and other partition columns 30 spaced apart in the axial direction of the housing 20 within the cooling cavity 21, to divide the cooling cavity 21 into a plurality of sub-cooling cavities 211 spaced apart in both the radial and axial directions of the housing 20.

[0039] In this embodiment, the cooling chamber 21 is divided into multiple sub-cooling chambers 211 spaced apart radially and / or axially in the housing 20 by the partition column 30. This reduces the flow rate of the coolant within the cooling chamber 21, thereby reducing the impact of the coolant on the battery cell 10 and improving the lifespan, safety, and reliability of the cylindrical battery.

[0040] In some embodiments, such as Figure 4 As shown, the housing 20 includes a first sub-housing 22 and a second sub-housing 23. The first sub-housing 22 is located on the side away from the battery cell 10, and the second sub-housing 23 is located on the side closer to the battery cell 10. The first sub-housing 22 and the second sub-housing 23 enclose each other to form a cooling cavity 21. A liquid injection hole 221 is provided on the first sub-housing 222, which is connected to the cooling cavity 21 and is used to inject coolant into the cooling cavity 21.

[0041] like Figure 4 As shown, the housing 20 in this embodiment includes a first sub-housing 22 and a second sub-housing 23. In the axial and / or radial direction of the cylindrical battery, the first sub-housing 22 is located on the side away from the cell 10, and the second sub-housing 23 is located on the side closer to the cell 10. The first sub-housing 22 and the second sub-housing 23 enclose and form a cooling cavity 21. It can be understood that the first sub-housing 22 is located on the outer side of the housing 20, and the second sub-housing 23 is located on the inner side of the housing 20.

[0042] The first sub-shell 22 is provided with a liquid injection hole 221, which penetrates the first sub-shell 22 in the thickness direction and communicates with the cooling cavity 21. That is, the liquid injection hole 221 is located on the outside of the shell 20 and communicates with the cooling cavity 21. Coolant is injected into the cooling cavity 21 through the liquid injection hole 21 to cool the battery cell 10, thereby reducing the temperature of the battery cell 10, making the temperature distribution of the battery cell 10 more uniform, and improving the service life and safety of the battery cell 10.

[0043] In some embodiments, the first sub-shell 22 and / or the second sub-shell 23 are provided with drain holes, which are connected to the cooling chamber 21 and are used to drain the coolant in the cooling chamber 21.

[0044] In this embodiment, a drain hole can be provided on the first sub-shell 22, and the drain hole communicates with the cooling cavity 21 so that the coolant in the cooling cavity 21 can be discharged from the drain hole. That is, the drain hole is provided on the outside of the shell 20 and communicates with the cooling cavity 21 so that the coolant in the cooling cavity 21 can be discharged from the outside of the shell 20.

[0045] In this embodiment, a drain hole can be provided on the second sub-shell 23, and the drain hole communicates with the cooling chamber 21 so that the coolant in the cooling chamber 21 can be discharged from the drain hole. That is, the drain hole is provided on the inner side of the shell 20 and communicates with the cooling chamber 21 so that the coolant in the cooling chamber 21 can be discharged from the inner side of the shell 20.

[0046] In this embodiment, a drain hole may also be provided on the first sub-shell 22, and a drain hole may also be provided on the second sub-shell 23. Both drain holes are connected to the cooling chamber 21 so that the coolant in the cooling chamber 21 can be discharged from the drain hole. That is, a drain hole is provided on the outer side of the shell 20, and a drain hole is also provided on the inner side of the shell 20 so that the coolant in the cooling chamber 21 can be discharged from either the inner or outer side of the shell 20.

[0047] In this embodiment, by providing drain holes on the first sub-shell 22 and / or the second sub-shell 23, and having the drain holes connected to the cooling chamber 21, the coolant with a high height in the cooling chamber 21 is discharged from the drain holes, thereby improving the safety and reliability of the cylindrical battery and preventing excessively hot coolant from remaining in the cooling chamber 21, making it difficult to cool the cell 10 in time and affecting the safety and reliability of the cylindrical battery.

[0048] In some embodiments, such as Figure 5 and Figure 6As shown, the drain hole includes a first drain hole 222, which is disposed on the first sub-shell 22 and is connected to the cooling cavity 21; the cylindrical battery also includes a first sealing plate, which is detachably connected to the first drain hole 222.

[0049] like Figure 5 and Figure 6 As shown, the drain hole in this embodiment includes a first drain hole 222, which is disposed on the first sub-shell 22 and communicates with the cooling cavity 21, so that the coolant in the cooling cavity 21 can be discharged from the first drain hole 222. That is, the first drain hole 222 is disposed on the outside of the outer shell 20 and communicates with the cooling cavity 21, so that the coolant in the cooling cavity 21 can be discharged from the first drain hole 222 to the outside of the shell 20, thereby improving the safety and reliability of the cylindrical battery and avoiding the coolant temperature from being too high, making it difficult to cool the cell 10 in time, thus affecting the safety and reliability of the cylindrical battery.

[0050] It should be noted that the cylindrical battery disclosed in this application embodiment also includes a first sealing plate, which is detachably connected to the first drain hole 222. When the temperature of the coolant in the cooling chamber 21 is lower than the preset temperature, the first sealing plate can be connected to the first drain hole 222 to block the first drain hole 222 and prevent the coolant in the cooling chamber 21 from draining out of the first drain hole 222. When the temperature of the coolant in the cooling chamber 21 is higher than the preset temperature, the first sealing plate can be removed from the first drain hole 222, allowing the coolant in the cooling chamber 21 to drain out of the first drain hole 222, thus preventing the coolant temperature in the cooling chamber 21 from becoming too high and affecting the safety and reliability of the cylindrical battery.

[0051] In this embodiment, the preset temperature of the coolant is not subject to excessive restrictions. In practical applications, technicians can set the preset temperature of the coolant as needed so that the coolant can be discharged from the cooling chamber 21 at a suitable temperature.

[0052] In some embodiments, along the axial direction of the housing 20, the housing 20 has a first end and a second end disposed opposite to each other, and the first drain hole 222 includes a plurality of first drain holes 222, some of which are spaced apart at the position of the first end of the housing 20, and other portions of the first drain holes 222 are spaced apart at the position of the sidewall of the housing 20 near the first end of the housing 20.

[0053] Along the axial direction of the housing 20, the housing 20 has a first end and a second end that are disposed opposite to each other. It can be understood that when the cylindrical battery is placed vertically, the first end is the bottom of the housing 20 and the second end is the top of the housing 20.

[0054] The cylindrical battery disclosed in this application embodiment is provided with a plurality of first drain holes 222. A portion of the plurality of first drain holes 222 is disposed at the first end of the housing 20, and the other portion of the plurality of first drain holes 222 is disposed on the side wall of the housing 20 near the first end of the housing 20. This is to drain the coolant in the cooling chamber 21 through the plurality of first drain holes 222, so as to avoid the coolant in the cooling chamber 21 becoming too hot, which would affect the safety and reliability of the cylindrical battery.

[0055] For example, there are four first drainage holes 222. Two first drainage holes 222 are arranged radially at the first end of the housing 20, and the other two first drainage holes 222 are arranged axially at the outer wall of the housing 20 near the first end of the housing 20.

[0056] It should be noted that the number of first drainage holes 222 in this embodiment can be 2, 3, 4, 5, 6, 7, 8, etc. In this embodiment, no particular limitation is placed on the specific number of first drainage holes 222. In practical applications, technicians can set the number as needed.

[0057] In some embodiments, such as Figure 5 As shown, the first drain hole 222 provided on the side wall of the housing 20 has a first opening 2221 away from the cooling chamber 21 and a second opening 2222 near the cooling chamber 21; along the axial direction of the housing 20, the height of the first opening 2221 is lower than the height of the second opening 2222.

[0058] like Figure 5 As shown, the first drain hole 222, located on the side wall of the housing 20, has a first opening 2221 and a second opening 2222. The first opening 2221 is located on the side away from the cooling chamber 21, and the second opening 2222 is located on the side closer to the cooling chamber 21. Axially, the height of the first opening 2221 is set lower than the height of the second opening 2222. When the temperature of the coolant in the cooling chamber 21 is higher than a preset temperature, the coolant in the cooling chamber 21 can flow from the second opening 2222 into the first drain hole 222, and then out through the first opening 2221. The lower height of the first opening 2221 compared to the first opening 2222 makes it easier for the coolant in the first drain hole 222 to flow from the second opening 2222 into the first opening 2221, thereby improving the coolant discharge efficiency.

[0059] In some embodiments, such as Figure 9 As shown, the drain hole also includes a second drain hole 231, which is disposed on the second sub-shell 23 and is connected to the cooling cavity 21; the cylindrical battery also includes a second sealing plate, which is detachably connected to the second drain hole 231, and the second sealing plate is a heat-sensitive sealing plate.

[0060] like Figure 9 As shown in the embodiment of this application, the drain hole further includes a second drain hole 231. The second drain hole 231 is disposed on the second sub-shell 23 and communicates with the cooling cavity 21, so that the coolant in the cooling cavity 21 can be discharged from the second drain hole 231. That is, the second drain hole 231 is disposed on the inner side of the outer shell 20 and communicates with the cooling cavity 21, so that the coolant in the cooling cavity 21 can be discharged from the second drain hole 231 into the shell 20 to cool the cell 10, thereby improving the safety and reliability of the cylindrical battery and preventing the cell 10 from overheating, which would affect the safety and reliability of the cylindrical battery.

[0061] It should be noted that the cylindrical battery disclosed in this application embodiment also includes a second sealing sheet, which is detachably connected to the second drain hole 231, and the second sealing sheet is a thermosensitive sealing sheet. When the temperature of the cell 10 is higher than a preset temperature, the thermosensitive sealing sheet automatically melts upon heating, and the second drain hole 231 becomes connected to the cooling chamber 21. The coolant in the cooling chamber 21 can then drain from the second drain hole 231 to the cell 10 to cool the cell 10, thereby ensuring the safety and reliability of the cylindrical battery. When the temperature of the cell 10 is lower than the preset temperature, the thermosensitive sealing sheet will not melt upon heating, and it can block the second drain hole 231.

[0062] In some embodiments, the thermosensitive sealing sheet includes at least one of a thermosensitive ceramic sealing sheet and a thermosensitive plastic sealing sheet.

[0063] In this application embodiment, the thermosensitive sealing sheet can be either a thermosensitive ceramic sealing sheet or a thermosensitive plastic sealing sheet. Both thermosensitive ceramic and thermosensitive plastic sealing sheets are highly sensitive to temperature; they can melt when the temperature exceeds a preset temperature. Furthermore, thermosensitive ceramic and thermosensitive plastic sealing sheets are relatively inexpensive, which helps reduce the manufacturing cost of cylindrical batteries and enhances their product competitiveness.

[0064] Of course, the above are just individual examples of specific materials for heat-sensitive sealing sheets and are not intended to limit this application. In practical applications, technicians can also choose specific materials for heat-sensitive sealing sheets as needed.

[0065] This application also discloses a battery pack, which includes a housing; and a cylindrical battery as described in the above embodiments, wherein the cylindrical battery is disposed within the housing.

[0066] It should be noted that the cylindrical battery included in the battery pack disclosed in this application has the same structure as the cylindrical battery described in the above embodiments, and its beneficial effects are also the same or similar. Further details will not be repeated here.

[0067] The battery pack disclosed in this application includes a housing, in which cylindrical batteries are disposed. The housing encapsulates and protects the cylindrical batteries, thereby improving the reliability and safety of the battery pack. Exemplarily, multiple cylindrical batteries are arranged sequentially within the housing for encapsulation and protection.

[0068] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0069] Although alternative embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0070] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0071] The technical solution provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A cylindrical battery, characterized in that, include: Battery cell (10); A housing (20) surrounds the outer periphery of the battery cell (10), and a cooling cavity (21) is provided inside the housing (20) along the circumference of the housing (20); A partition column (30) is provided in the cooling chamber (21) to divide the cooling chamber (21) into multiple sub-cooling chambers (211). The partition column (30) is provided with at least one through hole (31) that connects two adjacent sub-cooling chambers (211).

2. The cylindrical battery according to claim 1, characterized in that, The partition column (30) is arranged circumferentially along the housing (20), and the through hole (31) includes a plurality of through holes (31), which are arranged at intervals on the partition column (30) circumferentially along the housing (20).

3. The cylindrical battery according to claim 2, characterized in that, The partition column (30) includes a plurality of partition columns (30) arranged at intervals along the radial and / or axial direction of the housing (20).

4. The cylindrical battery according to claim 1, characterized in that, The housing (20) includes a first sub-shell (22) and a second sub-shell (23). The first sub-shell (22) is located on the side away from the battery cell (10), and the second sub-shell (23) is located on the side close to the battery cell (10). The first sub-shell (22) and the second sub-shell (23) together form the cooling cavity (21). The first sub-shell (22) is provided with a liquid injection hole (221), which is connected to the cooling chamber (21) and is used to inject coolant into the cooling chamber (21).

5. The cylindrical battery according to claim 4, characterized in that, The first sub-shell (22) and / or the second sub-shell (23) are provided with drain holes, which are connected to the cooling chamber (21) and are used to drain the coolant in the cooling chamber (21).

6. The cylindrical battery according to claim 5, characterized in that, The drain hole includes a first drain hole (222), which is disposed on the first sub-shell (22) and is connected to the cooling chamber (21). The cylindrical battery also includes a first sealing plate, which is detachably connected to the first drain hole (222).

7. The cylindrical battery according to claim 6, characterized in that, Along the axial direction of the housing (20), the housing (20) has a first end and a second end disposed opposite to each other. The first drain hole (222) includes a plurality of holes. Some of the first drain holes (222) are spaced apart at the first end of the housing (20), and other parts of the first drain holes (222) are spaced apart at the side wall of the housing (20) near the first end of the housing (20).

8. The cylindrical battery according to claim 7, characterized in that, The first drain hole (222) provided on the side wall of the housing (20) has a first opening (2221) away from the cooling chamber (21) and a second opening (2222) close to the cooling chamber (21). Along the axial direction of the housing (20), the height of the first opening (2221) is lower than the height of the second opening (2222).

9. The cylindrical battery according to claim 5, characterized in that, The drain hole also includes a second drain hole (231), which is disposed on the second sub-shell (23) and is connected to the cooling chamber (21). The cylindrical battery also includes a second sealing sheet, which is detachably connected to the second drain hole (231). The second sealing sheet is a thermosensitive sealing sheet.

10. The cylindrical battery according to claim 9, characterized in that, The thermosensitive sealing sheet includes at least one of thermosensitive ceramic sealing sheet and thermosensitive plastic sealing sheet.

11. A battery pack, characterized in that, include: Box; The cylindrical battery according to any one of claims 1-10, wherein the cylindrical battery is disposed within the casing.

Images