A battery

Abstract

The application discloses a battery, which comprises a shell, an electric core and a buffer, the shell surrounds the electric core, the shell is provided with a heat exchange cavity, the heat exchange cavity is stored with heat exchange medium, the buffer is arranged in the heat exchange cavity and connected with the shell, and the buffer is used for buffering the impact when the heat exchange medium is injected into the heat exchange cavity. The shell is provided with the heat exchange cavity, the buffer is arranged in the heat exchange cavity, when the heat exchange medium is injected into the heat exchange cavity, the impact of the heat exchange medium on the shell when the heat exchange medium is injected into the heat exchange cavity can be buffered through the buffer, so that the deformation of the shell caused by the impact of the heat exchange medium is reduced, the impact of the shell caused by the heat exchange medium when the heat exchange medium is injected into the heat exchange cavity and the impact of the electric core caused by the possible inward deformation of the shell are reduced, and the influence of the heat exchange medium on the performance of the shell and the electric core when the heat exchange medium is injected is reduced.

Description

Technical Field

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

[0002] Cylindrical batteries are high-capacity batteries with long cycle life and a wide operating temperature range. They are mainly used in solar lamps, lawn lights, backup power sources, power tools, and toy models.

[0003] In related technologies, cylindrical batteries include a casing and battery cells installed inside the casing. Some casings have heat dissipation functions. During the heat dissipation process, the casing may be affected. For example, when the casing is cooled by coolant, the coolant may impact the casing or battery cells, affecting them and thus impacting the battery's lifespan. Utility Model Content

[0004] This application aims to provide a battery that can solve the problem that when the casing is cooled by coolant, the coolant may impact the casing or the battery cell, affecting the casing or the battery cell and thus affecting the battery's lifespan.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application provides a battery comprising a casing, a battery cell, and a buffer. The casing surrounds the battery cell and has a heat exchange cavity for storing a heat exchange medium. The buffer is disposed within the heat exchange cavity and connected to the casing, and is used to buffer the impact when the heat exchange medium is injected into the heat exchange cavity.

[0007] Optionally, the housing includes a bottom and a side, the height direction of the battery is a first direction, the side surrounds the bottom around the first direction and is connected to the bottom, the side and the bottom enclose to form a receiving cavity, the battery cell is disposed in the receiving cavity, and at least one of the bottom and the side is provided with the heat exchange cavity.

[0008] Optionally, the bottom has a radial direction and a first center line extending along the first direction, the radial direction being perpendicular to the first direction; the heat exchange cavity includes a first sub-cavity disposed in the bottom; and the buffer includes a first buffer disposed around the first center line within the first sub-cavity.

[0009] The first buffer is provided with a first connecting channel that extends through the first buffer along the radial direction to connect the first sub-cavities located on both sides of the first buffer along the radial direction.

[0010] Optionally, the first buffer includes a plurality of first segments, which are spaced apart around the first center line within the first sub-cavity, and the gap between two adjacent first segments forms the first connecting channel.

[0011] And / or, the number of the first buffers is at least two, the at least two first buffers are arranged at a radial distance, one of the first buffers is arranged around the outer periphery of the other first buffer, and the orthographic projections of the first connecting channels of adjacent first buffers in the radial direction overlap or do not overlap.

[0012] Optionally, the first buffer member is further provided with a first shock-absorbing hole, which extends circumferentially along the first buffer member.

[0013] Optionally, the side portion has a second centerline extending along the first direction, the heat exchange cavity includes a second sub-cavity disposed in the side portion, and the buffer includes a second buffer, which is disposed in the second sub-cavity around the second centerline;

[0014] The second buffer is provided with a second connecting channel, which extends through the second buffer along the first direction to connect the second sub-cavities located on both sides of the second buffer along the first direction.

[0015] Optionally, the second buffer includes a plurality of second segments, which are spaced apart around the second center line within the second sub-cavity, and the gap between two adjacent second segments forms the second connecting channel;

[0016] And / or, the number of the second buffer is at least two, and at least two second buffers are spaced apart along the first direction, and the orthographic projections of the second connection channels of two adjacent second buffers in the first direction overlap or do not overlap.

[0017] Optionally, the second buffer member is further provided with a second shock-absorbing hole, which extends circumferentially along the second buffer member.

[0018] Optionally, the housing further includes an end portion, wherein an opening is formed at one end of the side portion away from the bottom, the end portion is located at one end of the side portion away from the bottom, the end portion is connected to the side portion and partially covers the opening along the circumference of the side portion, the opening is in communication with the receiving cavity, and the heat exchange cavity extends into the end portion.

[0019] Optionally, it also includes a sealing portion, wherein at least part of the side portion is recessed into the receiving cavity to form a groove, the groove being circumferentially arranged around the side portion, the groove having an opening and a wall, the sealing portion covering the opening and connecting to the side portion, the wall of the groove having a connecting hole communicating with the groove and the heat exchange cavity.

[0020] In the embodiments of this application, a heat exchange cavity is provided in the housing. By setting a buffer in the heat exchange cavity, when the heat exchange medium is injected into the heat exchange cavity, the buffer can buffer the impact of the heat exchange medium on the housing, thereby reducing the deformation of the housing caused by the impact of the heat exchange medium, reducing the impact of the heat exchange medium on the housing when it is injected into the heat exchange cavity, and reducing the impact of the housing's possible inward deformation on the battery cell, thereby reducing the impact of the heat exchange medium injection on the performance of the housing and the battery cell.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below, wherein:

[0023] Figure 1 This is a schematic diagram of the exploded structure of a battery according to an embodiment of this application;

[0024] Figure 2 This is a cross-sectional view of the battery disconnected according to an embodiment of this application;

[0025] Figure 3 This is a three-dimensional structural diagram of the housing according to an embodiment of this application;

[0026] Figure 4 This is a cross-sectional view of the housing according to an embodiment of this application;

[0027] Figure 5 This is a cross-sectional view of the bottom of an embodiment of this application;

[0028] Figure 6 This is a cross-sectional view of another housing according to an embodiment of this application;

[0029] Figure 7 for Figure 6 A magnified view of a section at point A in the middle;

[0030] Figure 8 This is a cross-sectional view of the first buffer component according to an embodiment of this application;

[0031] Figure 9 This is a cross-sectional view of the second buffer component according to an embodiment of this application.

[0032] Figure label:

[0033] 10. Shell; 11. Receiving cavity; 12. Heat exchange cavity; 121. First sub-cavity; 122. Second sub-cavity; 123. Injection hole; 13. Bottom; 14. Side; 141. Groove; 142. Connecting hole; 15. End; 16. Seal; 20. Battery cell; 30. Buffer; 31. First buffer; 311. First connecting channel; 312. First segment; 313. First shock-absorbing hole; 32. Second buffer; 321. Second connecting channel; 322. Second segment; 323. Second shock-absorbing hole; 40. Sealing ring; 45. Washer; 50. Explosion-proof valve; 55. Orifice plate; 60. First gasket; 65. Second gasket; 70. Positive electrode connecting piece; 75. Negative electrode connecting piece; X, First direction; Y, Radial; B, First centerline. Detailed Implementation

[0034] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0036] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] The battery provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0039] like Figures 1 to 7 As shown, a battery according to some embodiments of this application includes a housing 10, a cell 20, and a buffer 30. The housing 10 surrounds the cell 20, that is, the housing 10 covers and seals the cell 20. The heat exchange chamber 12 is used to store the heat exchange medium. The buffer 30 is disposed in the heat exchange chamber 12 and connected to the housing 10. The buffer 30 is used to buffer the impact when the heat exchange medium is injected into the heat exchange chamber 12.

[0040] It is understood that the housing 10 surrounds the receiving cavity 11, the battery cell 20 is disposed in the receiving cavity 11, and the housing 10 is provided with a heat exchange cavity 12, which is not connected to the receiving cavity 11.

[0041] In the embodiments of this application, the housing 10 is provided with a heat exchange cavity 12. By providing a buffer 30 in the heat exchange cavity 12, when the heat exchange medium is injected into the heat exchange cavity 12, the buffer 30 can buffer the impact of the heat exchange medium on the housing 10 when the heat exchange medium is injected into the heat exchange cavity 12, thereby reducing the deformation of the housing 10 caused by the impact of the heat exchange medium, reducing the impact of the heat exchange medium on the housing 10 when the heat exchange medium is injected into the heat exchange cavity 12, and reducing the impact of the housing 10 on the battery cell 20 due to possible inward deformation, thereby reducing the impact of the heat exchange medium injection on the performance of the housing 10 and the battery cell 20.

[0042] In addition, the heat exchange chamber 12 and the buffer 30 in this embodiment are both disposed in the housing 10, and will not occupy the internal space enclosed by the housing 10 or the external space of the housing 10. Compared with the traditional cooling method of setting liquid cooling plates or laying cooling pipes outside the battery, the heat exchange method in this embodiment can realize the heat exchange of the cell 20 and the buffer during the injection of the heat exchange medium without occupying extra space of the battery, thereby improving the space utilization of the battery.

[0043] Among them, such as Figure 3As shown, the housing 10 is a component that houses and protects the battery cell 20. The housing 10 can be made of steel, aluminum, or other materials. The housing 10 encloses a receiving cavity 11, into which the battery cell 20 is installed.

[0044] like Figure 4 As shown, the housing 10 is provided with a heat exchange cavity 12, which means that the heat exchange cavity 12 is provided in the shell wall of the housing 10. It can also be understood that at the location where the heat exchange cavity 12 is provided, the housing 10 has a multi-layer structure, such as a double-shell structure, and the space between the two shells forms the heat exchange cavity 12. Of course, the housing 10 can also be a multi-layer structure with more than two layers. The specific structure of the housing 10 can be flexibly set according to the actual situation, and the embodiments of this application do not limit it in this way.

[0045] like Figure 6 and Figure 7 As shown, the buffer 30 is disposed in the heat exchange cavity 12 and connected to the housing 10. The buffer 30 can buffer the impact when the heat exchange medium is injected into the heat exchange cavity 12. For example, when the heat exchange medium is injected, it directly impacts the buffer 30, thereby reducing the impact on the housing 10 and the battery cell 20 when the heat exchange medium is injected. The buffer 30 plays a buffering role.

[0046] In some embodiments, the heat exchange chamber 12 can be a cooling chamber, and a cooling medium, such as cooling water or other coolant, is added to the heat exchange chamber 12. In some high-temperature working scenarios or when the battery itself heats up, the cooling medium can dissipate heat and cool down the battery, ensuring that the battery is at a good working temperature.

[0047] In other embodiments, the heat exchange chamber 12 can be a heating chamber, and a heat-conducting medium, such as a water-glycol solution, mineral liquid, or other heat-conducting liquid, is added to the heat exchange chamber 12. In some low-temperature working scenarios (such as cold outdoor environments), the heat-conducting medium can heat and raise the temperature of the battery, ensuring that the battery is at a good operating temperature.

[0048] Optionally, such as Figure 6 and Figure 7As shown, the casing 10 includes a bottom 13 and a side 14. The height direction of the battery is a first direction X. The side 14 surrounds the bottom 13 around the first direction X and is connected to the bottom 13. The side 14 and the bottom 13 together form a receiving cavity 11. The battery cell 20 is disposed in the receiving cavity 11. At least one of the bottom 13 and the side 14 is provided with a heat exchange cavity 12. It can be understood that the side 14 surrounding the bottom 13 around the first direction X means that the side 14 surrounds the bottom 13 circumferentially around the first direction X. The "around" refers to the circumference of the bottom 13. That is, the front view of the bottom 13 can be a polygon, a circle, or an irregular structure. The specific shape of the front view of the bottom 13 can be flexibly set according to the actual situation. This application embodiment does not limit this.

[0049] In the embodiments of this application, by providing a heat exchange cavity 12 in at least one of the bottom 13 and side 14 of the housing 10, the heat exchange cavity 12 stores a heat exchange medium, such as cooling water, so that the battery cell 20 can be cooled. Thus, the cooling of the battery cell 20 can be achieved from the bottom 13 of the battery, or from the side 14 of the battery, or simultaneously from the bottom 13 and side 14 of the battery.

[0050] Specifically, such as Figure 6 and Figure 7 As shown, the housing 10 includes a bottom 13 and a side 14. The side 14 surrounds the bottom 13 in a first direction X and is connected to the bottom 13. The side 14 and the bottom 13 together form a receiving cavity 11. Both the bottom 13 and the side 14 of the housing 10 can be provided with heat exchange cavities 12. The heat exchange cavities 12 store heat exchange media, such as cooling water, so that the battery cell 20 can be cooled from different parts.

[0051] For example, the side portion 14 surrounds the bottom portion 13 in the first direction X and connects to the bottom portion 13, thereby forming a cylindrical or square shell, which can be used to manufacture cylindrical or square batteries to suit different application scenarios. Cylindrical batteries have a more mature manufacturing process, higher product yield, and a relatively larger surface area to volume ratio, resulting in better heat dissipation. Square batteries can be placed side-by-side in a battery pack, with smaller gaps between adjacent batteries, leading to higher energy density for the entire battery pack. Of course, the shape of the shell 10 can be flexibly set according to actual conditions, and this embodiment does not limit this.

[0052] For example, the bottom 13, side 14, and buffer 30 can be a single-piece structure, which can be manufactured using 3D printing technology (additive manufacturing technology), facilitating the fabrication of the bottom 13, side 14, and buffer 30 and reducing manufacturing difficulty. Alternatively, the buffer 30 can be made of materials with high thermal conductivity, such as ceramics, thermally conductive silicone, and thermally conductive rubber, to improve its thermal conductivity and facilitate heat dissipation. Of course, the materials used to manufacture the bottom 13, side 14, and buffer 30 can be flexibly chosen according to actual conditions, and this embodiment does not limit this choice.

[0053] Optionally, such as Figure 4 and Figure 5 As shown, the bottom 13 has a radial direction Y and a first center line B extending along the first direction X. The radial direction Y is perpendicular to the first direction X. The heat exchange cavity 12 includes a first sub-cavity 121 disposed in the bottom 13. The buffer 30 includes a first buffer 31. The first buffer 31 is disposed in the first sub-cavity 121 around the first center line B. The first buffer 31 is provided with a first connecting channel 311. The first connecting channel 311 passes through the first buffer 31 along the radial direction Y to connect the first sub-cavities 121 located on both sides of the first buffer 31 along the radial direction Y.

[0054] In the embodiments of this application, the first buffer 31 is disposed in the first sub-cavity 121 around the first center line B, thereby dividing the first sub-cavity 121 into inner and outer parts. By providing a first connecting channel 311 along the radial Y on the first buffer 31, the first sub-cavities 121 located on both sides of the first buffer 31 are connected. Liquid injection can be achieved by providing a liquid injection hole 123 in the first sub-cavity 121.

[0055] Specifically, such as Figure 5 As shown, the bottom 13 can be circular, thus having a radial direction Y and a first center line B passing through the center of the circle. A first sub-cavity 121 is disposed within the bottom 13. The first sub-cavity 121 can be a circular cavity structure or an annular cavity structure. A first buffer member 31 is disposed within the first sub-cavity 121 around the first center line B, forming an annular buffer structure. The first buffer member 31 is connected to the upper and lower walls of the first sub-cavity 121, thereby connecting the first buffer member 31 to the bottom 13 and simultaneously dividing the first sub-cavity 121 into inner and outer parts. The two parts can be connected through the first connecting channel 311.

[0056] Optionally, such as Figure 8 As shown, the first buffer 31 includes a plurality of first segments 312, which are spaced apart around the first center line B in the first sub-cavity 121, and the gap between two adjacent first segments 312 forms a first connecting channel 311.

[0057] In the embodiments of this application, the first connecting channel 311 is formed by the gap between two adjacent first segments 312, so that there is no need to set the first segment 312 at the gap, which can reduce the length of the first segment 312, reduce the material used to manufacture the first segment 312, and thus reduce the manufacturing cost of the first buffer 31.

[0058] Specifically, such as Figure 8 As shown, the first buffer 31 includes a plurality of first segments 312. The plurality of first segments 312 are arranged at intervals around the first center line B in the first sub-cavity 121. The first segment 312 can be a fan-shaped annular structure. The gap between two adjacent first segments 312 forms a first connecting channel 311. That is, when setting two adjacent first segments 312, a gap is directly reserved to form the first connecting channel 311.

[0059] Optionally, such as Figure 5 and Figure 8 As shown, the number of first buffer members 31 is at least two, and at least two first buffer members 31 are arranged at intervals along the radial Y direction. One first buffer member 31 is arranged around the outer periphery of the other first buffer member 31. The orthographic projections of the first connecting channels 311 of adjacent first buffer members 31 in the radial Y direction overlap or do not overlap.

[0060] In the embodiments of this application, at least two first buffers 31 are arranged at radial Y intervals, so that the first buffers 31 can be located at different positions on the bottom 13 and can play a buffering role from different positions. When the orthographic projections of the first connecting channels 311 of two adjacent first buffers 31 in the radial Y direction overlap, the distance between the first connecting channels 311 of the two adjacent first buffers 31 in the circumferential direction of the first buffer 31 is small, and the heat exchange medium (e.g., cooling water) flows from the first connecting channel 311 of one first buffer 31 to the first connecting channel 311 of the other first buffer 31 in a shorter time, and can flow to the area with a higher local temperature of the cell 20 more quickly. When the orthographic projections of the first connecting channels 311 of two adjacent first buffers 31 in the radial Y direction do not overlap, the distance between the first connecting channels 311 of the two adjacent first buffers 31 in the circumferential direction of the first buffer 31 is large, and during liquid injection, the time for the heat exchange medium to flow from the first connecting channel 311 of one first buffer 31 to the first connecting channel 311 of the other first buffer 31 is longer, and the buffering time for the heat exchange medium is longer.

[0061] Specifically, such as Figure 5 and Figure 8As shown, there are at least two first buffer members 31, spaced apart radially Y. One first buffer member 31 is arranged around the outer periphery of the other first buffer member 31, thus forming a ring-shaped buffer structure. The orthographic projection of the first connecting channel 311 in the radial Y direction refers to the orthographic projection of the outline shape of the first connecting channel 311 in the radial Y direction. For example, if the first connecting channel 311 is a rectangular channel, then the orthographic projection in the radial Y direction is rectangular. If the orthographic projections of the first connecting channels 311 of two adjacent first buffer members 31 overlap in the radial Y direction, it indicates that the distance between the first connecting channels 311 of the two adjacent first buffer members 31 along the circumferential direction of the first buffer member 31 is small. If the orthographic projections of the first connecting channels 311 of two adjacent first buffer members 31 do not overlap in the radial Y direction, it indicates that the distance between the first connecting channels 311 of the two adjacent first buffer members 31 along the circumferential direction of the first buffer member 31 is large.

[0062] Optionally, such as Figure 7 As shown, the first buffer member 31 is also provided with a first shock-absorbing hole 313, which extends circumferentially along the first buffer member 31.

[0063] In the embodiments of this application, a first shock-absorbing hole 313 is provided in the first buffer 31, so that the first buffer 31 forms a cavity structure, and the first buffer 31 has a shock-absorbing effect, which can reduce the impact of collisions on the battery.

[0064] Specifically, a cavity is formed inside the first buffer member 31, thereby forming a first damping hole 313 in the first buffer member 31. The first buffer member 31 is annular, and the first damping hole 313 can extend along the circumference of the first buffer member 31. That is to say, the projection of the first damping hole 313 on the bottom 13 is also annular.

[0065] For example, after the first damping hole 313 is provided in the first buffer member 31, the cross section of the first buffer member 31 along the first direction X at the first damping hole 313 becomes annular, such as a rectangular ring, a circular ring, or a racetrack-shaped ring (uniform). Of course, the cross section of the first buffer member 31 at the first damping hole 313 can be flexibly set according to the actual situation, and the embodiments of this application do not limit it in this way.

[0066] It should be noted that the first damping hole 313 can be connected to the first connecting channel 311 of the first buffer member 31, allowing the heat exchange medium to enter the first damping hole 313 and store more heat exchange medium. Alternatively, the first damping hole 313 can be disconnected from the first connecting channel 311 of the first buffer member 31, meaning that the first damping hole 313 is an independent cavity, preventing the heat exchange medium from entering the first damping hole 313 and ensuring its damping effect.

[0067] Optionally, such as Figure 7 As shown, the side portion 14 has a second centerline extending along the first direction X. The heat exchange chamber 12 includes a second sub-cavity 122 disposed in the side portion 14. The buffer member 30 includes a second buffer member 32, which is disposed in the second sub-cavity 122 around the second centerline. The second buffer member 32 is provided with a second connecting channel 321, which penetrates the second buffer member 32 along the first direction X to connect the second sub-cavities 122 located on both sides of the second buffer member 32 along the first direction X.

[0068] In the embodiments of this application, the second buffer 32 is disposed in the second sub-cavity 122 around the second center line, thereby dividing the second sub-cavity 122 into upper and lower parts. By providing a second connecting channel 321 along the first direction X in the second buffer 32, the second sub-cavities 122 located on both sides of the second buffer 32 are connected. Liquid injection can be achieved by providing a liquid injection hole 123 in the second sub-cavity 122.

[0069] Specifically, such as Figure 6 and Figure 7 As shown, the side portion 14 can be cylindrical, thus having a second center line collinear with the central axis of the cylinder. This second center line can coincide with the first center line B. A second sub-cavity 122 is disposed within the side portion 14, and the second sub-cavity 122 can be an annular cavity structure. A second buffer member 32 is disposed within the second sub-cavity 122 around the second center line, forming an annular buffer structure. The second buffer member 32 is connected to the inner and outer walls of the second sub-cavity 122, thereby connecting the second buffer member 32 to the side portion 14 and simultaneously dividing the second sub-cavity 122 into upper and lower parts. The upper and lower parts can be connected via the second connecting channel 321.

[0070] It should be noted that the first sub-cavity 121 and the second sub-cavity 122 can be interconnected or independent of each other. Whether the first sub-cavity 121 and the second sub-cavity 122 are connected can be flexibly set according to the actual situation, and this application embodiment does not limit this.

[0071] Optionally, such as Figure 9 As shown, the second buffer 32 includes a plurality of second segments 322, which are spaced apart around the second center line in the second sub-cavity 122, and the gap between two adjacent second segments 322 forms a second connecting channel 321.

[0072] In the embodiments of this application, the second connecting channel 321 is formed by the gap between two adjacent second segments 322, so that there is no need to set the second segment 322 at the gap, which can reduce the length of the second segment 322, reduce the material used to manufacture the second segment 322, and thus reduce the manufacturing cost of the second buffer 32.

[0073] Specifically, such as Figure 9 As shown, the second buffer 32 includes a plurality of second segments 322, which are spaced apart around the second center line in the second sub-cavity 122. The second segments 322 can be fan-shaped ring structures, and the gap between two adjacent second segments 322 forms a second connecting channel 321. That is, when setting two adjacent second segments 322, a gap is directly reserved to form the second connecting channel 321.

[0074] Optionally, such as Figure 7 As shown, the number of second buffers 32 is at least two, and at least two second buffers 32 are arranged at intervals along the first direction X. The orthographic projections of the second connecting channels 321 of two adjacent second buffers 32 on the first direction X overlap or do not overlap.

[0075] In the embodiments of this application, at least two second buffers 32 are spaced apart along the first direction X, such that the second buffers 32 can be located at different positions on the side 14 and can provide buffering from different positions. When the orthographic projections of the second connecting channels 321 of two adjacent second buffers 32 in the first direction X overlap, the distance between the second connecting channels 321 of the two adjacent second buffers 32 along the circumferential direction of the second buffer 32 is small, and the heat exchange medium (e.g., cooling water) flows from the second connecting channel 321 of one second buffer 32 to the second connecting channel 321 of the other second buffer 32 in a shorter time, allowing it to flow more quickly to the area of ​​the cell 20 with a locally higher temperature. When the orthographic projections of the second connecting channels 321 of two adjacent second buffers 32 do not overlap in the first direction X, the distance between the second connecting channels 321 of the two adjacent second buffers 32 along the circumferential direction of the second buffer 32 is large, and during liquid injection, the time for the heat exchange medium to flow from the second connecting channel 321 of one second buffer 32 to the second connecting channel 321 of the other second buffer 32 is longer, resulting in a longer buffering time for the heat exchange medium.

[0076] Specifically, such as Figure 7As shown, the number of second buffer members 32 is at least two, and at least two second buffer members 32 are spaced apart along the first direction X. The orthographic projection of the second connecting channel 321 in the first direction X refers to the orthographic projection of the outline shape of the second connecting channel 321 in the first direction X. For example, if the second connecting channel 321 is a rectangular channel, then the orthographic projection in the first direction X is a rectangle. If the orthographic projections of the second connecting channels 321 of two adjacent second buffer members 32 overlap in the first direction X, it indicates that the distance between the second connecting channels 321 of the two adjacent second buffer members 32 along the circumferential direction of the second buffer member 32 is small. If the orthographic projections of the second connecting channels 321 of two adjacent second buffer members 32 do not overlap in the first direction X, it indicates that the distance between the second connecting channels 321 of the two adjacent second buffer members 32 along the circumferential direction of the second buffer member 32 is large.

[0077] Optionally, such as Figure 7 As shown, the second buffer 32 is also provided with a second shock-absorbing hole 323, which extends circumferentially along the second buffer 32.

[0078] In the embodiments of this application, a second shock-absorbing hole 323 is provided in the second buffer 32, so that the first buffer 31 forms a cavity structure, and the second buffer 32 has a shock-absorbing effect, which can reduce the impact of collisions on the battery.

[0079] Specifically, such as Figure 7 As shown, a cavity is formed inside the second buffer member 32, thereby forming a second damping hole 323 in the second buffer member 32. The second buffer member 32 is annular, and the second damping hole 323 can extend along the circumference of the second buffer member 32. That is to say, the projection of the second damping hole 323 on the bottom 13 is also annular.

[0080] For example, after the second damping hole 323 is provided, the cross-section of the second buffer 32 at the second damping hole 323 along the first direction X becomes annular, such as a rectangular ring, a circular ring, or a racetrack-shaped ring (uniform). Of course, the cross-section of the second buffer 32 at the second damping hole 323 can be flexibly set according to the actual situation, and this application embodiment does not limit it in this way.

[0081] It should be noted that the second damping hole 323 can be connected to the second connecting channel 321 of the second buffer 32, allowing the heat exchange medium to enter the second damping hole 323 and store more heat exchange medium. Alternatively, the second damping hole 323 can be disconnected from the second connecting channel 321 of the second buffer 32, meaning that the second damping hole 323 is an independent cavity, preventing the heat exchange medium from entering and ensuring the damping effect of the second damping hole 323.

[0082] Optionally, such as Figure 7 As shown, the housing 10 also includes an end portion 15, an opening is formed at one end of the side portion 14 away from the bottom 13, the end portion 15 is located at one end of the side portion 14 away from the bottom 13, the end portion 15 is connected to the side portion 14 and has an opening along the circumferential covering portion of the side portion 14, the opening communicates with the receiving cavity 11, and the heat exchange cavity 12 extends into the end portion 15.

[0083] In the embodiments of this application, by providing an end portion 15 at one end of the side portion 14, which covers a portion of the opening, the components installed inside the housing 10 can be covered and protected. The heat exchange chamber 12 extends into the end portion 15, which can increase the volume of the heat exchange chamber 12 and the volume of the heat exchange medium that the heat exchange chamber 12 can accommodate.

[0084] Specifically, such as Figure 7 As shown, the side portion 14 has an opening at one end opposite to the bottom 13, which communicates with the receiving cavity 11, allowing components inside the housing 10 to be inserted into the housing 10 through the opening. An end portion 15 is located at the end of the side portion 14 away from the bottom 13, and is connected to the side portion 14. An opening is formed along the circumferentially covered portion of the side portion 14, and the heat exchange cavity 12 extends into the end portion 15, thereby increasing the volume of the heat exchange cavity 12.

[0085] Optionally, such as Figure 7 As shown, it also includes a sealing portion 16, and a side portion 14 is recessed into the receiving cavity 11 at least partially to form a groove 141. The groove 141 is arranged circumferentially around the side portion 14. The groove 141 has a groove opening and a groove wall. The sealing portion 16 covers the groove opening and connects to the side portion 14. The groove wall is provided with a connecting hole 142, which connects the groove 141 and the heat exchange cavity 12.

[0086] In the embodiments of this application, a groove 141 is formed in the recess of the side portion 14. The groove 141 protrudes relative to the inner wall of the side portion 14, which can improve the structural strength of the side portion 14 and the overall structural strength of the housing 10 to a certain extent. The groove 141 is sealed by the sealing portion 16 to form a storage space for storing heat exchange medium. A connecting hole 142 is provided in the groove wall to achieve communication with the heat exchange chamber 12. The heat exchange medium stored in the groove 141 can enter the heat exchange chamber 12 to cool the battery cell 20.

[0087] Specifically, such as Figure 7As shown, at least a portion of the side portion 14 is recessed into the receiving cavity 11 to form a groove 141. The groove 141 is arranged circumferentially around the side portion 14 and protrudes towards the center of the side portion 14, acting as a stiffener to improve the structural strength of the side portion 14. The sealing portion 16 can cover the opening of the groove 141 to achieve a seal. The groove 141 can be used to store the heat exchange medium. The groove wall of the groove 141 is provided with a connecting hole 142, which communicates with the heat exchange cavity 12, allowing the heat exchange medium to enter the heat exchange cavity 12.

[0088] For example, the groove 141 can be made by a grooving machine. The pressure knife of the grooving machine presses the outer wall of the side 14, and the rotation mechanism of the grooving machine drives the side 14 to rotate, thereby making the groove 141.

[0089] like Figure 1 and Figure 2 As shown, the battery in this embodiment also includes a sealing ring 40, a gasket 45, an explosion-proof valve 50, a perforated plate 55, a first gasket 60, a second gasket 65, a positive electrode connecting piece 70, and a negative electrode connecting piece 75. The second gasket 65 and the negative electrode connecting piece 75 are installed at the bottom of the housing 10, with the battery cell 20 located above the second gasket 65. The second gasket 65 serves as insulation, positioning, and cushioning. The first gasket 60 and the positive electrode connecting piece 70 are installed above the battery cell 20. The first gasket 60 also serves as insulation, positioning, and cushioning. The positive electrode connecting piece 70 and the negative electrode connecting piece 75... 5. The current of the cell 20 is discharged. The orifice plate 55 is installed above the cell 20. The orifice plate 55 is equipped with a fuse protection unit, which can quickly melt and cut off the current when the circuit is overloaded or short-circuited, thus protecting the circuit from damage. The gasket 45 is installed on the outside of the orifice plate 55, which can play a positioning and buffering role. The explosion-proof valve 50 is installed above the gasket 45, which can rupture and release pressure when the internal pressure of the cell 20 is too high, and cut off the current in advance to prevent explosion. The sealing ring 40 is installed on the outside of the explosion-proof valve 50, which can play a sealing role, realizing the sealing of the entire battery casing 10.

[0090] like Figure 2 As shown, the groove 141 is recessed inward, causing the inner wall of the side 14 to deform inward as well. The deformed part can be protruding relative to the inner wall of the side 14, forming a protruding structure. The sealing ring 40 can be installed on the deformed part to realize the installation of the sealing ring 40.

[0091] It should be noted that, as Figure 2As shown, the groove 141 is located above the battery cell 20. The groove 141 is manufactured after the battery cell 20 and other components (the components located below the groove 141) are installed into the housing 10, so as not to affect the installation of the battery cell 20 and other components, and to facilitate the installation of the battery cell 20 and other components. The end 15 is located above the explosion-proof valve 50, sealing ring 40 and other components. The end 15 is manufactured after the explosion-proof valve 50, sealing ring 40 and other components are installed into the housing 10. For example, the upper end of the side 14 can be bent inward to form the end 15.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0093] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery, characterized in that, The device includes a housing (10), a battery cell (20), and a buffer (30). The housing (10) surrounds the battery cell (20). The housing (10) has a heat exchange chamber (12) for storing a heat exchange medium. The buffer (30) is located inside the heat exchange chamber (12) and connected to the housing (10). The buffer (30) is used to buffer the impact when the heat exchange medium is injected into the heat exchange chamber (12).

2. The battery according to claim 1, characterized in that, The housing (10) includes a bottom (13) and a side (14). The height direction of the battery is a first direction (X). The side (14) surrounds the bottom (13) around the first direction (X) and is connected to the bottom (13). The side (14) and the bottom (13) enclose a receiving cavity (11). The battery cell (20) is disposed in the receiving cavity (11). At least one of the bottom (13) and the side (14) is provided with the heat exchange cavity (12).

3. The battery according to claim 2, characterized in that, The bottom (13) has a radial (Y) and a first center line (B) extending along the first direction (X), the radial (Y) being perpendicular to the first direction (X), the heat exchange cavity (12) including a first sub-cavity (121) disposed in the bottom (13), and the buffer (30) including a first buffer (31) disposed around the first center line (B) in the first sub-cavity (121); The first buffer (31) is provided with a first connecting channel (311), which extends through the first buffer (31) along the radial direction (Y) to connect the first sub-cavities (121) located on both sides of the first buffer (31) along the radial direction (Y).

4. The battery according to claim 3, characterized in that, The first buffer (31) includes a plurality of first segments (312), which are spaced apart around the first center line (B) in the first sub-cavity (121), and the gap between two adjacent first segments (312) forms the first connecting channel (311); And / or, the number of the first buffer (31) is at least two, at least two of the first buffer (31) are arranged at intervals along the radial (Y) direction, one of the first buffer (31) is arranged around the outer periphery of the other first buffer (31), and the first connecting channels (311) of the two adjacent first buffers (31) overlap or do not overlap in the orthographic projection in the radial (Y) direction.

5. The battery according to claim 3, characterized in that, The first buffer (31) is further provided with a first shock-absorbing hole (313), which extends circumferentially along the first buffer (31).

6. The battery according to any one of claims 2 to 5, characterized in that, The side portion (14) has a second center line extending along the first direction (X), the heat exchange cavity (12) includes a second sub-cavity (122) disposed in the side portion (14), and the buffer (30) includes a second buffer (32) disposed in the second sub-cavity (122) around the second center line; The second buffer (32) is provided with a second connecting channel (321), which extends through the second buffer (32) along the first direction (X) to connect the second sub-cavities (122) located on both sides of the second buffer (32) along the first direction (X).

7. The battery according to claim 6, characterized in that, The second buffer (32) includes a plurality of second segments (322), which are spaced apart around the second center line in the second sub-cavity (122), and the gap between two adjacent second segments (322) forms the second connecting channel (321); And / or, the number of the second buffer (32) is at least two, and at least two second buffers (32) are spaced apart along the first direction (X), and the orthographic projections of the second connection channels (321) of two adjacent second buffers (32) in the first direction (X) overlap or do not overlap.

8. The battery according to claim 6, characterized in that, The second buffer (32) is further provided with a second shock-absorbing hole (323), which extends circumferentially along the second buffer (32).

9. The battery according to claim 2, characterized in that, The housing (10) further includes an end portion (15), the side portion (14) forming an opening at one end away from the bottom (13), the end portion (15) being located at one end of the side portion (14) away from the bottom (13), the end portion (15) being connected to the side portion (14) and partially covering the opening along the circumference of the side portion (14), the opening communicating with the receiving cavity (11), and the heat exchange cavity (12) extending into the end portion (15).

10. The battery according to claim 2, characterized in that, It also includes a sealing portion (16), wherein at least part of the side portion (14) is recessed into the receiving cavity (11) to form a groove (141), the groove (141) is arranged circumferentially around the side portion (14), the groove (141) has a groove opening and a groove wall, the sealing portion (16) covers the groove opening and is connected to the side portion (14), the groove wall is provided with a connecting hole (142), the connecting hole (142) communicates the groove (141) and the heat exchange cavity (12).

Images