A battery and an electric device

Abstract

This application discloses a battery and an electrical device. The battery includes a core, a heat sink, and a casing. The core includes a core body and a tab, with the tab connected to the core body. The heat sink is disposed on at least one side of the tab, and both the heat sink and the core are housed within the casing. By providing a heat sink on at least one side of the tab, the heat sink is configured to expand when the temperature exceeds a preset temperature, so that at least a portion of the heat sink abuts against the casing and / or increases the contact area between the heat sink and the casing. When the current of the core body flows through the tab, causing the tab to heat up, or when the heat of the core body is transferred to the tab, the heat on the tab is transferred to the heat sink. The heat sink expands when the temperature exceeds the preset temperature, causing the heat sink to contact the casing or increasing the contact area between the heat sink and the casing. The heat of the heat sink is transferred to the casing and dissipated through the casing, thereby improving the heat dissipation performance of the tab and enhancing the safety performance of the battery.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery and an electrical device. Background Technology

[0002] In existing technology, batteries gradually heat up during charging and discharging. When the charging and discharging time is long, the internal temperature of the battery will usually become too high. Excessive internal temperature will reduce battery safety and the battery may catch fire due to excessive internal temperature. Summary of the Invention

[0003] In order to solve at least one problem existing in the prior art, this application provides a battery and an electrical device.

[0004] This application provides a battery, including:

[0005] An electrode core includes an electrode core body and at least one electrode tab, wherein the electrode tab is connected to the electrode core body;

[0006] At least one heat dissipation element is disposed on at least one side of the electrode tab and is adapted to dissipate heat from the electrode tab;

[0007] The housing has a receiving cavity, in which the pole core and the heat sink are both housed;

[0008] The heat sink is configured to expand when the temperature exceeds a preset temperature so that at least a portion of the heat sink abuts against the housing, and / or to increase the contact area between the heat sink and the housing.

[0009] In some embodiments, at least a portion of the heat sink is connected to the tab.

[0010] In some embodiments, at least a portion of the heat sink is spaced apart from the housing before expansion and comes into contact with the housing after expansion.

[0011] In some embodiments, in a first direction, the housing includes opposing first and second inner walls, with a first distance L1 between the first and second inner walls in the first direction;

[0012] At least a portion of the heat sink has a second minimum distance L2 between itself and the housing in the first direction before expansion, and the value of L2 is in the range of 0.05L1≦L2≦0.2L1, where L1 and L2 are in the same unit.

[0013] In some embodiments, at least a portion of the heat sink is positioned in contact with the housing before expansion.

[0014] In some embodiments, the heat sink includes at least one fixed portion and at least one protrusion, the protrusion being connected to the fixed portion;

[0015] At least a portion of the fixing part is connected to the electrode tab, and the protrusion protrudes toward the housing.

[0016] In some embodiments, the protrusion is connected to the side of the fixing portion away from the tab.

[0017] In some embodiments, in the first direction, the orthographic projection of the fixing part at least partially overlaps with the orthographic projection of the tab, and the ratio of the orthographic projection area of ​​the tab to the orthographic projection area of ​​the overlapping fixing part is not greater than 10 / 6.

[0018] In some embodiments, the fixing portion includes two sub-surfaces facing away from each other along a first direction, and the protrusion is connected to both of the sub-surfaces.

[0019] In some embodiments, in the first direction, the orthographic projection of the fixing part at least partially overlaps with the orthographic projection of the tab, and the ratio of the orthographic projection area of ​​the tab to the orthographic projection area of ​​the overlapping fixing part is not greater than 10 / 3.

[0020] In some embodiments, the protrusion includes a convex top and at least one connecting portion, one end of the connecting portion being connected to the convex top and the other end of the connecting portion being connected to the fixing portion;

[0021] In the first direction, the convex top and the fixing part are spaced apart;

[0022] Before the heat sink expands, at least a portion of the convex top and the housing are spaced apart, and / or at least a portion of the convex top and the housing are in contact.

[0023] In some embodiments, the protrusion includes two connecting portions, one end of each connecting portion being connected to the top of the protrusion, and the other end of each connecting portion being connected to the fixing portion.

[0024] In some embodiments, the two connecting portions are at least partially spaced apart.

[0025] In some embodiments, the tab includes a second tab portion, and in the thickness direction of the second tab portion, the orthographic projection of the connector is at least partially within the orthographic projection of the convex top.

[0026] In some embodiments, the electrode tab includes a second electrode tab portion, wherein the orthographic projection of the convex top and the orthographic projection of the connecting portion are at least partially offset in the thickness direction of the second electrode tab portion.

[0027] In some embodiments, in the first direction, the side of the convex top near the housing is at least one of a plane, an arc surface, a curved surface, and a wavy surface.

[0028] In some embodiments, multiple protrusions are provided, and before the heat sink expands, at least a portion of the protrusions and the housing are spaced apart, and / or at least a portion of the protrusions and the housing are in contact.

[0029] In some embodiments, the plurality of protrusions are spaced apart.

[0030] In some embodiments, the electrode tab includes a plurality of sub-electrodes, which are welded together to form the electrode tab.

[0031] In some embodiments, the tab includes at least one solder mark, and at least a portion of the heat sink is connected to at least a portion of the solder mark.

[0032] In some embodiments, the tabs and the housing are electrically connected; and / or

[0033] The battery includes a polarity element, and the tabs are electrically connected to the polarity element.

[0034] In some embodiments, the battery further includes at least one reinforcing member, and both the electrode tabs and the housing are fixedly connected to the reinforcing member; and / or

[0035] Both the electrode tab and the polar component are fixedly connected to the reinforcing component.

[0036] In some embodiments, the electrode lug includes a second electrode lug portion, which has two opposing surfaces in the thickness direction of the second electrode lug portion, and the reinforcing member is fixedly connected to one of the said surfaces; and / or

[0037] There are two reinforcing members, and the two reinforcing members are respectively fixedly connected to the two surfaces.

[0038] In some embodiments, the heat sink is connected to the side of the reinforcement away from the tab, and / or the heat sink is connected to the side of the tab away from the reinforcement.

[0039] In some embodiments, there is one reinforcement member, which is fixedly connected to one of the surfaces; there are multiple heat sinks, at least some of which are connected to the side of the reinforcement member away from the tab, and at least some of which are connected to another surface.

[0040] In some embodiments, the electrode lug has a first electrode lug portion, a second electrode lug portion, and a third electrode lug portion connected in sequence, the third electrode lug portion being connected to the side of the second electrode lug portion away from the first electrode lug portion; the third electrode lug portion is adapted to be bent and connected to the housing and / or the polarity member.

[0041] In some embodiments, the heat sink is a thermally expanding material.

[0042] In some embodiments, the coefficient of thermal expansion of the heat sink is greater than or equal to 80*10-6 mm / ℃.

[0043] In some embodiments, the heat sink is at least one of polyimide, polyphenylene sulfide, polycarbonate, azodicarbonamide, carbonates, water glass, silicon carbide, carbon black, alkanes, fluorocarbons, sodium dodecyl sulfate, fatty alcohol polyoxyethylene, and sodium ethylene ether sulfate.

[0044] In some embodiments, the heat sink is a shape memory metal.

[0045] In some embodiments, the surface of the heat sink is provided with an insulating film.

[0046] In some embodiments, the insulating film is at least one of glass fiber, polyester varnish, epoxy resin, and silicone resin.

[0047] This application also provides an electrical device, characterized in that it includes the battery provided in this application.

[0048] The battery of this application includes an electrode core, a heat sink, and a housing. The electrode core includes an electrode core body and a tab, with the tab connected to the electrode core body. The heat sink is disposed on at least one side of the tab, and both the heat sink and the electrode core are housed within the housing. By distributing the heat sink on at least one side of the tab, the heat sink is configured to expand when the temperature exceeds a preset temperature, causing at least a portion of the heat sink to abut against the housing and / or increasing the contact area between the heat sink and the housing. When current flows through the tab of the electrode core body, causing the tab to heat up, or when heat from the electrode core body is transferred to the tab, the heat on the tab is transferred to the heat sink. The heat sink expands when the temperature exceeds the preset temperature, causing the heat sink to contact the housing or increasing the contact area between the heat sink and the housing, allowing the heat from the heat sink to be transferred to the housing. The heat can be quickly dissipated to the outside of the battery through the housing, improving the internal heat dissipation capacity of the battery. By improving the heat dissipation performance of the tab, the internal heat dissipation capacity of the battery is improved, thereby enhancing the safety performance of the battery.

[0049] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0050] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0051] Figure 1 This is a schematic cross-sectional view of a battery according to certain embodiments of this application;

[0052] Figure 2 This is a partial cross-sectional schematic diagram of a battery according to certain embodiments of this application;

[0053] Figure 3 This is a schematic diagram of a heat sink according to certain embodiments of this application;

[0054] Figure 4 This is a schematic diagram of a heat sink according to certain embodiments of this application.

[0055] Explanation of key component symbols:

[0056] 10-Heat sink; 11-First heat sink; 12-Second heat sink; 110-Fixing part; 120-Protrusion; 121-Protruding top; 122-Connecting part;

[0057] 20 - Electrode core; 21 - Electrode core body; 22 - Electrode tab; 221 - First electrode tab; 222 - Second electrode tab; 223 - Third electrode tab;

[0058] 30-Reinforcing component; 40-Shell; 41-Cover plate; 42-First inner wall; 43-Second inner wall; 50-Current-carrying component; 60-Electrical pole; 70-Insulating component. Detailed Implementation

[0059] The embodiments of this application are described in detail below. Examples of the embodiments are shown 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 the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0060] In existing technology, batteries gradually heat up during charging and discharging. When the charging and discharging time is long, the internal temperature of the battery will usually become too high. Excessive internal temperature will reduce battery safety and the battery may catch fire due to excessive internal temperature.

[0061] To address or improve the aforementioned problems, this patent proposes a battery comprising a core, a heat sink, and a casing. The core includes a core body and a tab, with the tab connected to the core body. The heat sink is disposed on at least one side of the tab, and both the heat sink and the core are housed within the casing. By providing a heat sink on at least one side of the tab, the heat sink is configured to expand when the temperature exceeds a preset temperature, causing at least a portion of the heat sink to abut against the casing and / or increasing the contact area between the heat sink and the casing. When current flows through the tab of the core body, causing the tab to heat up, or when heat from the core body is transferred to the tab, at least a portion of the heat sink is connected to the tab, thereby transferring heat from the tab to the heat sink. The heat sink expands when the temperature exceeds the preset temperature, causing the heat sink to contact the casing or increasing the contact area between the heat sink and the casing. Heat from the heat sink is transferred to the casing and dissipated through the casing. By improving the heat dissipation performance of the tab, the internal heat dissipation capacity of the battery is improved, thereby enhancing the battery's safety performance.

[0062] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0063] Please refer to Figure 1 The battery 1000 includes an electrode core 20, a heat sink 10, a reinforcing component 30, a housing 40, and a polar component 50. The electrode core 20, the heat sink 10, the reinforcing component 30, and the polar component 50 are all housed within the housing.

[0064] In some embodiments, the electrode core 20 includes an electrode core body 21 and a tab 22. The tab 22 is connected to the electrode core body 21, and the electrode core body 21 can output or input electrical energy through the tab 22. During the input or output process, the electrode core body generates heat, and the tab 22 also generates heat when electrical energy passes through it. During the charging and discharging process of the battery 1000, the temperature of the tab 22 will further increase, which will cause the internal temperature of the battery 1000 to become too high. The battery 1000 may pose a safety hazard due to its excessive internal temperature, such as catching fire or exploding. The battery 1000 of this application transfers the heat from the tab 22 to the casing 40 through the heat sink 10, and the heat is dissipated to the outside of the battery 1000 through the casing 40. That is, by improving the heat dissipation capacity of the tab 22, the heat dissipation capacity of the battery 1000 is improved, thus improving the safety performance of the battery 1000.

[0065] In some embodiments, the electrode core body 21 includes multiple electrode sheets, each electrode sheet having a sub-electrode tab of the same polarity. The electrode sheets are stacked so that the sub-electrode tabs of the same polarity are stacked, and multiple sub-electrode tabs are stacked to form an electrode tab 22. In some embodiments, the electrode core body 21 includes multiple electrode sheets, each electrode sheet having multiple sub-electrode tabs of the same polarity. The electrode sheets are stacked or wound so that the sub-electrode tabs of the same polarity are suitable for stacking, and multiple sub-electrode tabs of the same polarity are stacked to form an electrode tab 22.

[0066] As can be seen from the above, the electrode 22 includes multiple sub-electrodes, and the electrode 22 is formed by stacking multiple sub-electrodes.

[0067] Furthermore, multiple sub-tabs are stacked and welded together to form tab 22. Welding makes the connection between the multiple sub-tabs more robust, thereby increasing the reliability of tab 22.

[0068] In some embodiments, the tab 22 includes a positive tab and a negative tab, which are insulated from each other and spaced apart. The core body 21 includes a positive electrode plate and a negative electrode plate, and sub-tabs are provided on the positive electrode plate and the negative electrode plate respectively. Sub-tabs of the same polarity are stacked and formed by welding to form the tab 22.

[0069] In some embodiments, the housing 40 includes a cover plate 41 and a sub-housing 42. The sub-housing 42 has an opening, and the cover plate 41 closes the opening to close the sub-housing 42. The sub-housing 42 has a receiving cavity in which the pole core 20, the heat sink 10, the reinforcing member 30, and the polarity member 50 are all disposed.

[0070] In some embodiments, the housing 40 is composed of a middle frame and a top plate. The middle frame forms two openings, and the top plate is adapted to close the two openings formed by the middle frame. The middle frame includes multiple side walls. In this case, the tab 22 is connected to one of the side walls of the middle frame. The middle frame and one of the top plates can also be integrally formed by stamping. The composition of the housing 40 is not limited here. Any composition that can form the housing 40 is within the protection scope of this application.

[0071] In some embodiments, the electrode tab 22 includes a first electrode tab 221, a second electrode tab 222, and a third electrode tab 223. The two ends of the first electrode tab 221 are respectively connected to the electrode core body 21 and the end of the second electrode tab 222 near the electrode core body 21. The end of the second electrode tab 222 away from the electrode core body 21 is connected to the end of the third electrode tab 223 near the electrode core body 21.

[0072] It should be noted that when the tab 22 is located inside the housing 40, if the tab 22 is too long and extends beyond the outside of the housing 40, the tab 22 will be bent so that the excessively long tab 22 is completely contained within the housing 40. The third tab portion 223 refers to the portion of the tab 22 that is bent and contained within the housing 40. Please refer to [link / reference]. Figure 1The bent portion of the electrode tab 22 that avoids the housing 40 is the third electrode tab 223, and at least a portion of the third electrode tab 223 abuts against the polar member 50.

[0073] It should be noted that when the casing 40 of the battery 1000 is a polar component, the third electrode tab 223 can directly abut against the casing 40 to achieve electrical connection between the electrode tab and the casing.

[0074] Along the extension direction of the tab 22 extending from the core body 21, the second tab 222 is a portion disposed between the core body 21 and the housing and tightly stacked, and the second tab 222 is adapted to be provided with a heat sink 10.

[0075] To further explain, the welding point for welding multiple sub-electrodes into electrode 22 is located at the second electrode 222, or it can also be located at the third electrode 223.

[0076] The first tab 221 is the initial convergence point of the sub-tabs 22. Because the thickness of the electrode sheet and the sub-tab are not the same (the electrode sheet is usually thicker than the sub-tab), after the electrodes are stacked or wound, multiple sub-tabs will converge towards the center when stacked. (See also...) Figure 1 The first electrode tab 221 is wider at the bottom and narrower at the top, and at least some of the sub-tabs in the first electrode tab 221 have gaps between them. It should be noted that in some embodiments, if the housing itself can be charged, then the polarizing element 50 is not required, and the electrode tab 22 can directly contact the housing, that is, it can be electrically connected or welded to achieve the electrical connection between the housing 40 and the electrode tab 22. In this case, if the electrode tab 22 does not extend outside the housing 40, that is, the length of the electrode tab 22 is relatively short, then the electrode tab 22 only includes the first electrode tab 221 and the second electrode tab 222, and the second electrode tab 222 can be directly electrically connected to the housing or the polarizing element 50; or, the reinforcing element 30 can be made of conductive metal material, thereby achieving the electrical connection between the electrode tab and the polarizing element or the housing through the reinforcing element 30.

[0077] In some embodiments, when the casing is not charged, and the battery 1000 is provided with terminals 60 and electrically connected to external devices or circuits through terminals 60, the tab 22 can be directly electrically connected to the terminal 60. For example, the tab 22 and the terminal 60 can be welded together by laser welding or through-welding to achieve the electrical connection. As described above, the terminal 60 can be electrically connected through the second tab 222 or the third tab 223.

[0078] In some embodiments, the polarity element 50 is used to electrically connect the terminal post 60 and the tab 22. The tab 22 is welded to the side of the polarity element 50 away from the terminal post 60, and the side of the polarity element 50 away from the tab 22 is welded to the side of the terminal post closer to the current-carrying element. The polarity element 50 is used to weld the tab 22 and the terminal post 60. In this case, a fuse can be provided on the polarity element 50 to ensure the safety of the battery 1000. When the instantaneous current of the battery 1000 is too large, the fuse melts, thereby disconnecting the electrical connection between the terminal post 60 and the tab 22.

[0079] The second tab 222 formed during the bending process of the tab 22 is not necessarily as shown. Figure 1 As shown, the second electrode ear 222 may extend in a direction away from the electrode core body 21, and may be irregularly curled or bent in a direction away from the electrode core body 21. As a result, at least one curved portion or multiple curved portions bending in opposite directions may be generated on the second electrode ear 222. The specific shape of the second electrode ear 222 is not specifically limited here. The second electrode ear 222 disposed between the first electrode ear 221 and the third electrode ear 223 is within the protection scope of this application.

[0080] In some embodiments, the heat sink 10 is disposed on both opposite sides of the second electrode tab 222 and is fixedly connected to the second electrode tab 222 by adhesive or welding. The connection between the heat sink 10 and the second electrode tab 222 allows heat energy on the electrode tab 22 to be transferred to the heat sink 10 more quickly, thereby improving the heat dissipation speed of the electrode tab 22.

[0081] In some embodiments, the heat sink 10 may be disposed only on one side of the second electrode tab 222, or the heat sink 10 may be partially disposed on the first electrode tab 221 and the third electrode tab 223. All heat sinks 10 disposed on the electrode tab 22 are within the scope of protection of this application.

[0082] It should be noted that when the heat sink 10 is located on one side of the tab 22, the heat sink 10 may not be connected to or in contact with the tab 22. When assembling the battery, the heat sink can be placed next to the tab. When the internal temperature of the housing 40 is high, the temperature near the tab 22 will also rise. The temperature is transferred to the heat sink 10. After the heat sink 10 expands, it can come into contact with the housing 40 or the contact area with the housing 40 will increase. During the expansion process, the heat sink 10 may also come into contact with the tab 22. At this time, the heat sink 10 can also improve the heat dissipation speed inside the housing.

[0083] In some embodiments, if the heat sink 10 and the tab 22 are fixedly connected, the weight of the heat sink 10 may loosen the fixed connection between the tab 22 and the polarity 50, the housing 40, or the pole 60, thus reducing its reliability. Applying the weight of the heat sink 10 to the tab 22 for a long time may cause the welding between the tab 22 and the polarity 50, the housing 40, or the pole 60 to desolder.

[0084] Therefore, in some embodiments, the battery 1000 further includes a reinforcing member 30. The reinforcing member 30 is disposed on at least one side of the tab 22. While the reinforcing member 30 is fixedly connected to the tab 22, the reinforcing member 30 can also be fixedly connected to the polarity member 50, the housing 40, or the terminal post 60. The fixed connection can be made by welding or bonding.

[0085] It should be noted that the bending direction of the electrode tab 22 is away from the reinforcing member 30. That is, the third electrode tab 223 extends in a direction away from the reinforcing member 30. The bending direction of the electrode tab 22 needs to avoid the fixed connection area between the reinforcing member 30 and the housing or polar member 50.

[0086] In some embodiments, the reinforcing member 30 is metal, and the reinforcing member 30 and the tab can be welded. The side of the reinforcing member 30 away from the core body 22 is welded to the polar member 50 or the shell. In this case, the reinforcing member 30 can undertake part of the power extraction function, share the power on the tab 22, and prevent the temperature of the tab 22 from becoming too high.

[0087] It should be noted that if the reinforcing member 30 can serve as a source of electrical energy, then the tab 22 may not be electrically connected to the polarity member 50, the housing 40, or the pole 60. In this case, the reinforcing member 30 also serves as a source of electrical energy, meaning that the tab 22 may not have a third tab 223, and the length of the tab 22 may be relatively short.

[0088] The heat sink 10 can be positioned on the side of the tab 22 away from the reinforcing member 30, as shown in the reference. Figure 1 The heat sink 10 includes a second heat sink 12, which is located on the side of the tab 22 away from the reinforcing member 30. At this time, the reinforcing member 30 is connected to the tab 22 and the polarity member 50 respectively, and the reinforcing member 30 can support the second tab 222.

[0089] Of course, the heat sink 10 can also be positioned on the side of the reinforcing member 30 away from the tab 22, as shown in the reference. Figure 1 The heat sink 10 includes a first heat sink 11, which is disposed on the side of the reinforcing member 30 away from the tab 22. Heat on the reinforcing member 30 is transferred to the first heat sink 11. The first heat sink 11 expands at high temperature and comes into contact with the shell, thereby dissipating the heat on the reinforcing member 30.

[0090] The first heat sink 11 and the second heat sink 12 can be provided, or both can be provided, both of which can improve the heat dissipation performance of the tab 22 to a certain extent.

[0091] Furthermore, when the reinforcing member 30 is a metal part, the weld joint of the reinforcing member 30 and the tab 22 will also generate heat. At this time, the heat dissipation member 10 can also be partially connected to the weld joint formed by the reinforcing member 30 and the tab 22. The heat dissipation member 10 also has a heat dissipation effect on the reinforcing member 30.

[0092] It should be noted that the heat sink 10 is not limited to the second tab 222. The first tab 221 and the third tab 223 can also be equipped with the heat sink 10 if conditions permit, thereby further improving the heat dissipation capacity of the tab 22.

[0093] In some embodiments, the heat dissipation performance of the tab 22 can be improved even without the reinforcement 30 inside the battery 1000. For example, when the tab 22 and the housing 40 are directly welded, the tab 22 has a certain rigidity. In this case, placing the heat sink 10 on one or both sides of the tab 22 can also improve the heat dissipation capacity of the tab 22 and achieve electrical connection between the tab 22 and the housing 40 or the polarity component 50.

[0094] In some embodiments, the heat sink 10 includes a fixing portion 110 and a protrusion 120. The fixing portion 110 is fixedly connected to the tab 22 or the reinforcing member 30, and the protrusion 120 protrudes towards the side closest to the housing 40 so that the protrusion 120 can more easily contact the housing 40.

[0095] In some embodiments, the protrusion 120 is located on the side of the fixing portion 110 away from the tab 22, in which case the fixing portion 110 can be used for welding to the tab 22 or the reinforcing member 30 in more locations. Please refer to Figure 3 The protrusion 120 is provided on one side of the fixing part 110. At this time, the area of ​​the fixing part 110 that can be fixedly connected with the tab 22 or the reinforcing member 30 is larger, which can make the fixed connection of the heat sink 10 more secure.

[0096] The first direction X in this application refers to the width direction of the battery, see reference. Figure 1The thickness direction of the battery 1000 mentioned in this application is perpendicular to both the width and height directions of the battery. Of course, for the shape of the battery 1000, its width direction may also be its thickness direction. In short, the first direction X is close to the extension direction of the width of the tab 22. In some embodiments, in the first direction X, the orthographic projection of the fixing part 110 at least partially overlaps with the orthographic projection of the tab 22, and the ratio of the orthographic projection area of ​​the tab 120 to the overlapping orthographic projection area of ​​the fixing part 110 is not greater than 10 / 6, to ensure the stability of the heat sink 10 and the tab 22. If the area of ​​the fixed connection between the fixing part 110 and the second tab 222 is too small, the fixed connection may be unreliable, and the heat sink 110 may detach. If the area of ​​the fixed connection between the fixing part 110 and the second tab 222 is too large, the tab 22 may not be able to dissipate heat through contact with the air when the heat sink 10 cannot be close to the casing for heat dissipation.

[0097] Please refer to Figure 1 The extension direction of tab 22 can also be tilted relative to the height direction of battery 1000, and no specific restrictions are made here.

[0098] In some embodiments, the protrusion 120 may include only a connecting part 122. In this case, it is still possible to achieve contact between the heat sink 10 and the housing 40 after the heat sink 10 expands. No specific restrictions are placed on the various composition forms of the protrusion 120.

[0099] In some embodiments, the fixing member 110 includes two sub-surfaces facing away from each other along a first direction, and the protrusion 120 is connected to both sub-surfaces. In this case, the raw material used to manufacture the heat sink 10 can be a sheet-like object, with a portion of the sheet-like object protruding to form the protrusion 120, and the non-protruding portion forming the fixing member 110. In this case, the heat sink 10 is made using a sheet-like object, simplifying the manufacturing process. See also... Figure 4 At this time, the fixing part 110 is composed of multiple spaced sub-fixing parts. This reduces the number of fixable connection points between the fixing part 110 and the tab 22 or reinforcing member 30, but the tab 22 or reinforcing member 30, which does not cover the heat sink 10, is beneficial for its own heat dissipation. Of course, the sub-fixing parts can also be configured to be connected to each other; since this implementation is also common, no specific limitation is made here.

[0100] In some embodiments, the fixing part 110 is composed of multiple spaced or continuously arranged sub-fixing parts. In this case, the area of ​​the fixing part 110 is relatively small. In this situation, in the first direction X, the orthographic projection of the fixing part 110 and the tab 22 at least partially overlaps. The ratio of the orthographic projection area of ​​the tab 22 to the orthographic projection area of ​​the overlapping fixing part 110 is not greater than 10 / 3, so as to ensure the stability of the fixation of the heat sink 10 and the tab. If the area of ​​the fixing part 110 and the second tab 222 is too small, the fixing connection may be unreliable, and the heat sink 110 may fall off. If the area of ​​the fixing part 110 and the second tab 222 is too large, the tab 22 may not be able to dissipate heat through contact with the air when the heat sink 10 cannot be close to the housing for heat dissipation.

[0101] It should be noted that in some embodiments, the area of ​​the fixed connection between the fixing part 110 and the electrode tab 22 is not necessarily equal to the area of ​​the fixing part. For example, at least a portion of the reinforcing member 110 may extend beyond the edge of the second electrode tab 222 and be suspended on the side of the second electrode tab 222. This side refers to the two opposite sides along the width direction of the electrode tab 22. In this way, with part of the fixing part 110 extending beyond the side and being exposed to the air, more protrusions 120 can be appropriately provided, which can improve the heat dissipation speed of the electrode tab 22 to a certain extent.

[0102] In some embodiments, the fixing portion 110 and the protrusion 120 on the heat sink 10 may be integrally formed or separate, and no specific limitation is made here.

[0103] In some embodiments, the tab 22 is formed by stacking and welding multiple sub-tabs. In this case, the tab 22 has at least one weld seam, which is usually a location where heat is more concentrated. Therefore, at least a portion of the fixing part 110 needs to be connected to at least a portion of the weld seam so that the heat at the weld seam can be transferred away through the fixing part 110. Preferably, all weld seams on the tab 22 are covered by the fixing part 110 so that the heat at the weld seam can be transferred to the heat sink 10 in a timely manner, thereby improving the heat dissipation speed of the tab 22.

[0104] It should be noted that the weld may run through the tab 22 along the stacking direction of the sub-tabs so that all sub-tabs can be welded through the weld. In this case, the heat sink 10 may only cover the weld on one side of the tab 22.

[0105] In some embodiments, the protrusion 120 includes a convex top 121 and a connecting portion 122. One end of the connecting portion 122 is connected to one side of the fixing portion 110, and the other end of the connecting portion 122 is connected to the convex top. It should be noted that a protrusion 120 may include two connecting portions 122. One end of each connecting portion 122 is connected to both ends of the convex top, and the other end of each connecting portion 122 is connected to the fixing portion 110. The two connecting portions 122 are at least partially spaced apart, thereby creating a receiving space between the two connecting portions 122. The receiving space facilitates heat dissipation of the connecting portion 122, and since the connecting portion 122 expands when heated, the receiving space can also provide expansion space for the connecting portion 122.

[0106] It should be noted that, in the first direction X, the distance between the convex top 121 and the tab 22 is greater than the distance between the connecting part 122 and the tab 22.

[0107] In some embodiments, the surface of the convex top 121 away from the housing 40 is flat. As the connecting part 122 and the convex top 121 expand, the side of the convex top 121 near the housing 40 contacts the housing 40. At this time, the flat surface of the convex top 121 can increase the contact area with the housing 40 and improve the heat dissipation rate.

[0108] In some embodiments, in the thickness direction of the second electrode lug 222, the orthographic projection of the connector 122 is at least partially within the orthographic projection of the convex top 121. See also... Figure 4 At this point, the distance between the other ends of the two connecting portions 122 connected to the same convex top 121 is less than the width of the convex top 121 itself. It should be noted that the distance between the two connecting portions 122 and the width of the convex top 122 itself refer to the distance and width in the extending direction of the heat sink 10. This arrangement not only allows for a larger area of ​​the fixing portion, making the fixing connection of the heat sink 10 more secure, but also increases the area of ​​the convex top 121. When the larger convex top 121 contacts the housing 40, or, more preferably, makes close contact, the heat dissipation performance of the heat sink 10 can be further improved.

[0109] It should be noted that the side of the convex top 121 closest to the housing 40 may not be a flat surface, but an arc surface, a curved surface, or a wavy surface, or an arc-shaped bend naturally formed according to the material properties of the heat sink 10. As long as it can make contact with the housing 40 after expansion, it can be used as the convex top 121 of the heat sink 10 of this application. No specific restrictions are made here.

[0110] In some embodiments, the heat sink 110 includes a plurality of protrusions 120, please refer to Figures 1-4Multiple protrusions 120 are arranged at intervals. Increasing the number of protrusions 120 not only increases the contact area with the housing 40, but also increases the reliability of the heat sink 10 in normal operation. If some protrusions 120 cannot contact the housing 40, the remaining protrusions 120 can still achieve rapid heat dissipation through contact with the housing 40.

[0111] It should be noted that the multiple protrusions 120 can be arranged with intervals or without intervals. When arranged with intervals, the multiple protrusions 120 dissipate heat separately, resulting in better heat dissipation performance, and the intervals between the protrusions 120 facilitate their expansion. When the multiple protrusions 120 are located on the side of the fixing part 110 away from the tab 22, the protrusions 120 can also be arranged without intervals, but connected together. In this case, a larger number of protrusions 120 can be arranged, improving the heat dissipation capacity of the heat sink 10.

[0112] Before the heat sink 10 expands, the heat sink 10 and the housing 40 can be spaced apart, or the heat sink 10 and the housing 40 can be in contact.

[0113] When the heat sink 10 expands, if the heat sink 10 and the housing 40 are spaced apart, the expanded heat sink 10 and the housing will come into contact, and the heat on the heat sink 10 can be transferred to the housing 40, thereby realizing that the heat energy of the tab 22 is transferred to the housing 40 through the heat sink 10 and dissipated through the housing 40.

[0114] In the battery 1000, the protrusion 120 and the housing 40 may be spaced apart. In the first direction X, the housing 40 includes a first inner wall 42 and a second inner wall 43 opposite to each other, and the first inner wall 42 and the second inner wall 43 have a first distance L1 in the first direction X.

[0115] In the first direction X, the side of the convex top 121 near the housing 40 and the side of the housing 40 near the convex top 121 have a second distance L2. The value range of L2 is: 0.05L1≦L2≦0.2L1, where L1 and L2 are in the same unit. That is, the value range of L2 is determined by the value of L1. If the value of L2 is too small, the heat sink 10 will still not be able to contact the housing 40 after it expands, and the heat sink 10 will not be able to dissipate heat effectively. If the value of L2 is too large, the heat sink 10 will not be able to effectively move away from the housing 40 at low temperatures after it is heated and comes into contact with the housing, thus forcing the battery 1000 to dissipate heat at low temperatures, which is not conducive to the low temperature protection of the battery 1000.

[0116] The spaced arrangement between the heat sink 10 and the housing 40 allows the battery 1000 to maintain good heat insulation in low-temperature environments. When the battery 1000 is in a low-temperature environment, causing the core body 21 or the tab 22 to become too cold, resulting in degraded battery performance, internal heat insulation is crucial. When the heat sink 10 expands to contact the housing 40 at high temperatures, it retracts to a spaced-out position at low temperatures. In this state, heat from the tab 21 is transferred to the heat sink 10. Since the heat sink 10 is inside the housing 40 and not in contact with it, good internal heat insulation is achieved, preventing heat dissipation from the tab 22 through the housing 40.

[0117] In some embodiments, the heat sink 10 may also be in contact with the housing. When the heat sink 10 expands due to heat, the contact area between the heat sink 10 and the housing 40 increases. This is because during the expansion of the heat sink 10, the convex top 121 or the connecting portion 122 near the convex top 121 can abut against the inner wall of the housing 40 due to expansion. At this time, the contact area between the heat sink 10 and the housing 40 increases, and the heat of the heat sink 10 can be transferred to the housing 40 more quickly and dissipated through the housing 40, thereby improving the heat dissipation efficiency of the heat sink 10.

[0118] In some embodiments, the heat sink 10 includes a plurality of protrusions 120, some of which are in contact with the housing 40, while others are spaced apart from the housing 40. This ensures the functionality of the heat sink 10, preventing it from failing to dissipate heat through the housing 40 due to expansion failure, and also reduces the risk of heat dissipation through the tabs at low temperatures.

[0119] In some embodiments, the battery 1000 also includes a polarizing element, which can be a terminal post, a current collector, a current guide plate, a housing, or any other device used to collect the current from the electrode core and guide it to the outside of the housing so as to facilitate electrical connection between the electrode core and external devices.

[0120] When battery 1000 is a steel-cased battery, it usually has a positive terminal, and its casing is typically negatively charged. The tab 22 can be directly connected to the positive terminal or the casing to electrically connect the battery to external devices; in this case, the positive terminal and the casing are insulated from each other.

[0121] When the battery 1000 is another type of battery, it is usually equipped with two polarity components such as terminals or rivets as the power output components of the battery 1000, and no specific restrictions are made here.

[0122] In some embodiments, if the battery 1000 includes multiple tabs, regardless of whether the polarities of the tabs are the same or opposite, heat sinks 10 can be provided on each of the multiple tabs.

[0123] Please see Figure 1The housing has a through hole, through which the pole post 60 passes, so that part of it is inside the housing 40 and part of it is outside the housing. The side of the pole post 60 near the pole tab 22 and the side of the polarizing element 50 near the pole post 60 are electrically connected, and this electrical connection is usually welded. After the third pole tab 223 is bent, it at least partially abuts against the side of the polarizing element 50 away from the pole post 60. At this time, the third pole tab 223 and the polarizing element 50 can be fixedly connected by welding.

[0124] In some embodiments, the heat sink 10 is made of a thermally expanding material. The thermally expanding material can expand rapidly when heated, thereby allowing the heat sink 10 to contact the housing 40, or increasing the heat-receiving area of ​​the heat sink 10 and the housing 40.

[0125] In some embodiments, the coefficient of thermal expansion of the heat sink is greater than or equal to 80*10. -6 mm / ℃, which allows the heat sink to have good expansion and rebound effects, not only enabling good heat dissipation when the tab 22 is at a high temperature, but also preventing the battery 1000 from dissipating heat through the heat sink 10 in low-temperature environments.

[0126] It should be noted that the coefficient of thermal expansion refers to the degree of change in the length and volume of a material under temperature conditions. The unit in this article is mm / ℃, describing the change in length of the material per degree Celsius.

[0127] In some embodiments, the heat sink 10 is at least one of polyimide, polyphenylene sulfide, polycarbonate, azodicarbonamide, carbonates, water glass, silicon carbide, carbon black, alkanes, fluorocarbons, sodium dodecyl sulfate, fatty alcohol polyoxyethylene, and sodium ethylene ether sulfate. These materials can be used alone or in combination as the heat sink 10. These materials not only have resistance to electrolyte corrosion and insulation properties, but can also expand when heated to achieve the heat dissipation effect of the heat sink 10.

[0128] In some embodiments, the heat sink 10 can also be a shape memory metal. In this case, the surface of the heat sink 10 is provided with an insulating film. The insulating film can cover the heat sink 10 to insulate it from the housing 40 and the tabs 22. Although these shape memory metals are metallic, they also have excellent thermal expansion properties, so they can also be used as materials for the heat sink 10. When a metallic material is used to make the heat sink 10, insulation treatment is required. If insulation is not performed, it may lead to a short circuit or power loss.

[0129] The insulating film is at least one of glass fiber, polyester varnish, epoxy resin, and silicone resin. The insulating film needs to be resistant to electrolyte corrosion and have good insulation properties.

[0130] In some embodiments, the fixed connection between the heat sink 10 and the tab 22 or the reinforcing member 30 can be by bonding or welding. All connection methods that can achieve a fixed connection are within the protection scope of this application and are not specifically limited here.

[0131] This application also provides an electrical device, which includes the battery provided in this application. The improved heat dissipation capacity of the battery in this application further enhances the safety performance of the electrical device.

[0132] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an 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.

[0133] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery, characterized in that, include: An electrode core includes an electrode core body and at least one electrode tab, wherein the electrode tab is connected to the electrode core body; At least one heat dissipation element is disposed on at least one side of the electrode tab and is adapted to dissipate heat from the electrode tab; The housing has a receiving cavity, in which the pole core and the heat sink are both housed; The heat sink is configured to expand when the temperature exceeds a preset temperature so that at least a portion of the heat sink abuts against the housing, and / or to increase the contact area between the heat sink and the housing.

2. The battery according to claim 1, characterized in that, At least a portion of the heat sink is connected to the tab.

3. The battery according to claim 1, characterized in that, The heat sink is spaced apart from the housing before expansion and comes into contact with the housing after expansion.

4. The battery according to claim 3, characterized in that, In a first direction, the housing includes opposing first and second inner walls, with a first distance L1 between the first and second inner walls in the first direction; At least a portion of the heat sink has a second minimum distance L2 between itself and the housing in the first direction before expansion, and the value of L2 is in the range of 0.05L1≦L2≦0.2L1, where L1 and L2 are in the same unit.

5. The battery according to claim 1, characterized in that, At least a portion of the heat sink is positioned in contact with the housing before expansion.

6. The battery according to claim 1, characterized in that, The heat sink includes at least one fixed part and at least one protruding part, wherein the protruding part is connected to the fixed part; At least a portion of the fixing part is connected to the electrode tab, and the protrusion protrudes toward the housing.

7. The battery according to claim 6, characterized in that, The protrusion is connected to the side of the fixing part away from the electrode tab.

8. The battery according to claim 7, characterized in that, In the first direction, the orthographic projection of the fixing part at least partially overlaps with the orthographic projection of the electrode tab, and the ratio of the orthographic projection area of ​​the electrode tab to the orthographic projection area of ​​the overlapping fixing part is not greater than 10 / 6.

9. The battery according to claim 6, characterized in that, The fixing part includes two sub-surfaces that are opposite to each other along a first direction, and the protrusion is connected to both of the sub-surfaces.

10. The battery according to claim 9, characterized in that, In the first direction, the orthographic projection of the fixing part at least partially overlaps with the orthographic projection of the electrode tab, and the ratio of the orthographic projection area of ​​the electrode tab to the orthographic projection area of ​​the overlapping fixing part is not greater than 10 / 3.

11. The battery according to claim 6, characterized in that, The protrusion includes a protruding top and at least one connecting part, one end of the connecting part is connected to the protruding top, and the other end of the connecting part is connected to the fixing part; In the first direction, the convex top and the fixing part are spaced apart; Before the heat sink expands, at least a portion of the convex top and the housing are spaced apart, and / or at least a portion of the convex top and the housing are in contact.

12. The battery according to claim 11, characterized in that, The protrusion includes two connecting parts, one end of each connecting part is connected to the top of the protrusion, and the other end of each connecting part is connected to the fixing part.

13. The battery according to claim 12, characterized in that, The two connecting parts are at least partially spaced apart.

14. The battery according to claim 12, characterized in that, The electrode lug includes a second electrode lug portion, and in the thickness direction of the second electrode lug portion, the orthographic projection of the connecting portion is at least partially within the orthographic projection of the convex top.

15. The battery according to claim 12, characterized in that, The electrode lug includes a second electrode lug portion, and in the thickness direction of the second electrode lug portion, the orthographic projection of the convex top and the orthographic projection of the connecting portion are at least partially offset.

16. The battery according to claim 11, characterized in that, In the first direction, the side of the convex top near the housing is at least one of a plane, an arc surface, a curved surface, and a wavy surface.

17. The battery according to claim 6, characterized in that, The protrusions are provided in multiple ways. Before the heat sink expands, at least some of the protrusions are spaced apart from the housing, and / or at least some of the protrusions are in contact with the housing.

18. The battery according to claim 17, characterized in that, The protrusions are spaced apart.

19. The battery according to claims 1-18, characterized in that, The electrode tab includes multiple sub-electrodes, which are welded together to form the electrode tab.

20. The battery according to claim 19, characterized in that, The tab includes at least one solder mark, and at least a portion of the heat sink is connected to at least a portion of the solder mark.

21. The battery according to any one of claims 1-18, characterized in that, The electrode tab is electrically connected to the housing; and / or The battery includes a polarity element, and the tabs are electrically connected to the polarity element.

22. The battery according to claim 21, characterized in that, The battery further includes at least one reinforcing member, and the electrode tabs and the housing are both fixedly connected to the reinforcing member; and / or Both the electrode tab and the polar component are fixedly connected to the reinforcing component.

23. The battery according to claim 22, characterized in that, The electrode lug includes a second electrode lug portion, which has two opposing surfaces along its thickness direction. The reinforcing member is fixedly connected to one of the surfaces; and / or There are two reinforcing members, and the two reinforcing members are respectively fixedly connected to the two surfaces.

24. The battery according to claim 23, characterized in that, The heat sink is connected to the side of the reinforcing member away from the tab, and / or the heat sink is connected to the side of the tab away from the reinforcing member.

25. The battery according to claim 24, characterized in that, There is one reinforcing member, which is fixedly connected to one of the surfaces; there are multiple heat dissipation members, at least some of which are connected to the side of the reinforcing member away from the tab, and at least some of which are connected to the other surface.

26. The battery according to claim 21, characterized in that, The electrode lug has a first electrode lug portion, a second electrode lug portion, and a third electrode lug portion connected in sequence. The third electrode lug portion is connected to the side of the second electrode lug portion away from the first electrode lug portion. The third electrode lug portion is adapted to be bent and connected to the housing and / or the polar component.

27. The battery according to any one of claims 1-18, characterized in that, The heat sink is made of a thermally expanding material.

28. The battery according to claim 27, characterized in that, The coefficient of thermal expansion of the heat sink is greater than or equal to 80*10. -6 mm / ℃.

29. The battery according to claim 27, characterized in that, The heat dissipation component is at least one of polyimide, polyphenylene sulfide, polycarbonate, azodicarbonamide, carbonates, water glass, silicon carbide, carbon black, alkanes, fluorocarbons, sodium dodecyl sulfate, fatty alcohol polyoxyethylene, and sodium ethylene ether sulfate.

30. The battery according to claim 27, characterized in that, The heat sink is made of shape memory metal.

31. The battery according to claim 30, characterized in that, The surface of the heat sink is provided with an insulating film.

32. The battery according to claim 31, characterized in that, The insulating film is at least one of glass fiber, polyester varnish, epoxy resin, and silicone resin.

33. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1-32.

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