Battery, battery pack and electric device

Abstract

The utility model provides a kind of battery, battery pack and electric equipment, it is related to battery technical field.The battery includes: shell, electric core and heat sink, shell has accommodating cavity, the section of accommodating cavity is annular, shell also limits the heat dissipation cavity located in the radial inner side of accommodating cavity along shell, heat dissipation cavity and accommodating cavity are separated by shell;Electric core is located in accommodating cavity;Heat sink is located in heat dissipation cavity, and heat sink is used for heat exchange with shell.The battery of the application can prevent heat sink from contacting with electrolyte in accommodating cavity, avoid heat sink from being corroded by electrolyte, and is beneficial to improve the safety and reliability of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery, battery pack and electrical equipment. Background Technology

[0002] To ensure efficient battery discharge performance and high safety, the battery's operating temperature needs to be controlled within a certain range. For example, the battery can be heated in low-temperature environments and cooled in high-temperature environments.

[0003] In the prior art, enameled heat dissipation wires are installed inside the battery to dissipate heat inside the battery when the battery temperature is high, thereby improving the uniformity of battery temperature. The heat dissipation wires are made of pure copper metal wires.

[0004] However, since the enameled heat dissipation wires are directly placed inside the battery and in contact with the electrolyte, prolonged immersion can easily cause the enamel layer to peel off, resulting in the copper wires coming into direct contact with the electrolyte, which can lead to a short circuit and create a safety hazard. Utility Model Content

[0005] In view of the above problems, this application provides a battery, battery pack and electrical device that helps prevent heat sinks from directly contacting the electrolyte inside the battery, thereby improving battery safety.

[0006] In a first aspect, this application provides a battery, comprising: a housing having a receiving cavity with an annular cross-section, the housing further defining a heat dissipation cavity located radially inside the receiving cavity along the housing, the heat dissipation cavity and the receiving cavity being separated by the housing; a battery cell disposed within the receiving cavity; and a heat dissipation element disposed within the heat dissipation cavity for exchanging heat with the housing.

[0007] In one possible implementation, the heat sink includes: a support body extending axially along the shell and passing through a heat dissipation cavity; and a finned structure disposed on the side wall of the support body, with heat exchange material disposed on the inner side of the finned structure.

[0008] In one possible implementation, there are multiple fin structures, which are distributed along the circumferential and / or axial direction of the supporting body.

[0009] In one possible implementation, the fin structure is divided into multiple heat dissipation groups distributed along the axial direction of the support body, and each heat dissipation group includes multiple fin structures distributed circumferentially along the support body.

[0010] In one possible implementation, the fin structure comprises a plastic component.

[0011] In one possible implementation, the plastic part is PP or PE.

[0012] In one possible implementation, the heat exchange material includes a phase change material.

[0013] In one possible implementation, the phase change material is a straight-chain alkane paraffin, polyethylene glycol, fatty acid, or polyethylene glycol.

[0014] In one possible implementation, the finned structures are spaced apart from the inner wall of the heat dissipation cavity.

[0015] In one possible implementation, the distance between the end of the fin structure furthest from the support body and the inner wall of the heat dissipation cavity is 1mm-5mm.

[0016] In one possible implementation, the housing includes: a bottom shell, the bottom shell including a first side plate, a second side plate and an end plate, the first side plate being located inside the second side plate, the end plate being connected to the first end of the first side plate and the second side plate to define a receiving cavity together with the first side plate and the second side plate, the inner side of the first side plate defining a heat dissipation cavity, and the second ends of the first side plate and the second side plate defining an opening; and a cover plate covering the opening.

[0017] In one possible implementation, the heat dissipation cavity extends through at least one of the end plate and the cover plate; or, the end plate and the cover plate respectively seal off both ends of the heat dissipation cavity.

[0018] In one possible implementation, the housing further includes: a terminal assembly that passes through the cover plate and is electrically connected to the battery cell.

[0019] In one possible implementation, the pole assembly is ring-shaped and arranged around the heat dissipation cavity.

[0020] In one possible implementation, the bottom shell is a one-piece molded structure.

[0021] Secondly, this application provides a battery pack, including: a substrate; any of the above-mentioned batteries, wherein there are multiple batteries arranged on the substrate.

[0022] In one possible implementation, the heat sink of each battery is connected to the substrate, and / or the casing of each battery is connected to the substrate.

[0023] Thirdly, this application provides an electrical device including any of the batteries in the first aspect, or any of the battery packs in the second aspect.

[0024] The battery provided in this application has a casing that separates the heat dissipation cavity and the housing cavity. A heat dissipation component is disposed within the heat dissipation cavity and exchanges heat with the casing. When the battery temperature is high, the heat dissipation component dissipates heat from within the heat dissipation cavity, thereby carrying away heat from the center of the battery, which helps ensure temperature uniformity during battery heat dissipation. Furthermore, because the heat dissipation cavity and the housing cavity are isolated from each other, the battery cells and electrolyte are located within the housing cavity, while the heat dissipation component is located within the heat dissipation cavity. This avoids direct contact between the electrolyte and the heat dissipation component, preventing corrosion and ensuring battery safety, thus improving battery lifespan. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of this application;

[0027] Figure 2 for Figure 1 A sectional view of the battery along line AA;

[0028] Figure 3 for Figure 2 BB-direction cross-sectional view of the middle battery;

[0029] Figure 4 This is a schematic diagram of the battery pack structure according to an embodiment of this application;

[0030] Figure 5 This is a diagram showing the usage state of the battery in the battery pack according to an embodiment of this application.

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

[0032] 100-battery;

[0033] 110 - Housing; 111 - Bottom shell; 1111 - First side plate; 1111a - Heat dissipation cavity; 1112 - Second side plate; 1112a - Receiving cavity; 1113 - End plate; 112 - Cover plate; 1121 - Explosion-proof valve; 1122 - Liquid injection hole; 113 - Pole post assembly;

[0034] 120-cell;

[0035] 130 - Heat sink; 131 - Support body; 132 - Fin structure;

[0036] 140 - Electrolyte;

[0037] 10 - Battery pack; 11 - Substrate. Detailed Implementation

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

[0039] As the background section illustrates, in existing technologies, when dissipating heat from a battery in a high-temperature environment, enameled heat dissipation wires made of pure copper are installed inside the battery to improve temperature uniformity. However, since the enameled heat dissipation wires are directly placed inside the battery and in contact with the electrolyte, prolonged immersion can easily cause the enamel layer to peel off, resulting in the copper wires coming into direct contact with the battery's internal components, creating a safety hazard.

[0040] In view of this, this application provides a battery, a battery pack, and an electrical device. The battery includes a casing, a cell, and a heat sink. The casing defines a receiving cavity and a heat sink cavity. The receiving cavity has an annular cross-section, and the heat sink cavity is located radially inside the receiving cavity. The heat sink cavity is separated from the receiving cavity by the casing. The heat sink cavity is located inside the heat sink cavity. When the battery temperature is high, the heat sink cavity dissipates heat from within the heat sink cavity, thereby carrying away heat from the center of the battery, which helps ensure the uniformity of temperature during battery heat dissipation. Furthermore, since the heat sink cavity and the receiving cavity are isolated from each other, the battery cell and electrolyte are both located within the receiving cavity, and the heat sink cavity is located within the heat sink cavity. This avoids direct contact between the electrolyte and the heat sink cavity, preventing corrosion of the heat sink cavity, which helps ensure battery safety and improve battery life.

[0041] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings:

[0042] It should be noted that the battery provided in this application embodiment can be applied to various battery packs or electrical devices.

[0043] See Figure 1 , Figure 2 and Figure 3 As shown, the battery 100 in this embodiment includes: a casing 110, a battery cell 120, and a heat sink 130.

[0044] The housing 110 has a receiving cavity 1112a, such as Figure 3 As shown, the receiving cavity 1112a has an annular cross-section along the radial direction of the housing 110. The housing 110 also defines a heat dissipation cavity 1111a located radially inside the receiving cavity 1112a along the housing 110. The heat dissipation cavity 1111a and the receiving cavity 1112a are separated by the housing 110. The battery cell 120 is disposed in the receiving cavity 1112a. The heat dissipation component 130 is disposed in the heat dissipation cavity 1111a and is used for heat exchange with the housing 110.

[0045] In this embodiment, when the battery 100 is working, a large amount of heat is generated at the center of the battery 100 and is difficult to dissipate. The cross-section of the receiving cavity 1112a is annular, and the heat dissipation cavity 1111a is located at the center of the annulus. The heat dissipation component 130 is disposed in the heat dissipation cavity 1111a. In this way, the heat dissipation component 130 can carry away the heat inside the battery 100 by exchanging heat with the shell 110, which is beneficial to improving the heat dissipation efficiency of the battery 100 and ensuring the uniformity of the battery 100 temperature. In addition, the heat dissipation cavity 1111a can also act as a pressure relief channel when the battery 100 experiences thermal runaway, so as to quickly discharge high-temperature gas when the battery 100 experiences thermal runaway, which is beneficial to the safety of the battery 100.

[0046] The heat sink 130 can have different structures such as heat dissipation wires or heat dissipation fins, and its material can be thermally conductive materials such as phase change materials or metal materials. The specific structure and material of the heat sink 130 are not limited in this application embodiment, as long as it can achieve rapid heat dissipation. In addition, the heat sink 130 can be in direct contact with the inner wall of the heat dissipation cavity 1111a, i.e., the shell 110, to increase the contact area and thus improve the heat dissipation efficiency. Alternatively, a certain space can be reserved between the heat sink 130 and the shell 110 to allow for thermal expansion of the heat sink 130 and prevent the heat sink 130 from expanding and being damaged due to excessive temperature. The specific connection relationship between the heat sink 130 and the shell 110 can be reasonably selected according to the shape and structure of the heat sink 130, and is not limited in this application embodiment.

[0047] It should be noted that in addition to the battery cell 120, the cavity 1112a of the battery 100 also needs to be filled with electrolyte 140 to provide a transport path for lithium ions or other active ions, so as to realize the charge transfer between the positive and negative electrodes of the battery 100. In the existing technology, the heat dissipation wire is directly immersed in the electrolyte 140. Even if the outer surface of the heat dissipation wire is covered with a paint layer, the paint layer on the surface of the heat dissipation wire may peel off after the battery 100 has been used for a long time due to the corrosiveness of the electrolyte 140. This will cause the heat dissipation wire to come into direct contact with the electrolyte 140, which may cause the battery 100 to short circuit and create a safety hazard.

[0048] Therefore, in this embodiment, the heat dissipation cavity 1111a and the receiving cavity 1112a are separated into two chambers by the housing 110. The heat dissipation component 130 is disposed in the heat dissipation cavity 1111a, and the electrolyte 140 and the battery cell 120 are located in the receiving cavity 1112a. In this way, it can ensure that the heat dissipation can carry away the heat inside the battery 100 and achieve heat dissipation, and it can also avoid direct contact between the heat dissipation component 130 and the electrolyte 140, thereby improving the life of the heat dissipation component 130 and preventing the battery 100 from short-circuiting and other problems, which is beneficial to improving the safety and service life of the battery 100.

[0049] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3 As shown, the heat sink 130 of this application embodiment includes: a support body 131 and a fin structure 132. The support body 131 extends along the axial direction of the shell 110 and passes through the heat sink cavity 1111a. The fin structure 132 is disposed on the side wall of the support body 131, and the inner side of the fin structure 132 is provided with heat exchange material, that is, the fin structure 132 wraps the heat exchange material.

[0050] It should be noted that the heat exchange material is placed inside the fin structure 132, including coating the part of the fin structure 132 near the support body 131 with heat exchange material. Alternatively, the fin structure 132 can be set as a hollow structure, defining a receiving cavity for holding the heat exchange material. In this way, when the heat exchange material is in a liquid state, it can prevent the heat exchange material from being lost or leaking. At the same time, the outer shell formed by the fin structure 132 can also protect the internal heat exchange material, reduce the contact between the heat exchange material and the outside air, and improve the service life of the heat exchange material. Of course, the specific arrangement of the heat exchange material inside the fin structure 132 is not limited in this embodiment of the application, and can be reasonably selected according to the properties of the heat exchange material itself or the shape and size of the fin structure 132.

[0051] In a specific implementation, the fin structure 132 can increase the contact area between the heat sink 130 and the air in the heat dissipation cavity 1111a, thereby improving the heat dissipation efficiency of the heat sink 130. At the same time, a heat exchange material is provided on the inner side of the fin structure 132. The heat exchange material can be a phase change material, graphene, etc. The embodiments of this application do not limit this. This is beneficial to further reduce the thermal resistance and enable the heat sink 130 to maintain a relatively stable temperature when the temperature of the battery 100 increases sharply. This is beneficial to reduce the risk of thermal runaway of the battery 100 and further improve the safety of the battery 100.

[0052] In addition, the support body 131 extends along the axial direction, which can ensure that the hot air in each part of the heat dissipation cavity 1111a can fully contact the heat dissipation component 130, which is conducive to improving the heat dissipation efficiency of the heat dissipation component 130, while ensuring the uniformity of the battery 100 temperature and ensuring the safe and stable operation of the battery 100.

[0053] See also some of the possible implementation methods. Figure 1 and Figure 2 As shown, there are multiple fin structures 132 in this embodiment of the application, and the multiple fin structures 132 are distributed along the circumferential and / or axial directions of the support body 131.

[0054] In practical implementation, when the fin structure 132 is distributed circumferentially along the supporting body 131, it can maximize the contact area between the fin structure 132 and the air in the heat dissipation cavity 1111a, thereby improving the heat dissipation power of the heat sink 130. When the fin structure 132 is distributed axially along the supporting body 131, it can play a certain guiding role, guiding the air to form a directional flow, reducing flow resistance, and thus further improving the heat dissipation effect of the heat sink 130. Of course, the fin structure 132 can also be set such that some fin structures 132 are distributed axially and some fin structures 132 are distributed circumferentially. The combination of the two distribution methods can form a three-dimensional heat exchange network, realize rapid heat dissipation, reduce the temperature difference inside the battery 100, thereby extending the service life of the battery 100 and improving the performance of the battery 100.

[0055] See also some of the possible implementation methods. Figure 1 and Figure 2 As shown, the fin structure 132 of this embodiment is divided into multiple heat dissipation groups, which are distributed along the axial direction of the support body 131. Each heat dissipation group includes multiple fin structures 132 distributed circumferentially along the support body 131.

[0056] In some embodiments, arranging multiple heat dissipation groups along the circumference helps to block heat from being directly conducted along the support body 131 and forces heat to be released through the fin structure 132. At the same time, the circumferential distribution of the fin structure 132 in each heat dissipation group helps to disrupt the laminar flow state of the fluid and form local vortices, which helps to improve the convective heat transfer coefficient and thus improve the heat dissipation efficiency of the heat dissipation component 130.

[0057] Furthermore, the density of the fin structure 132 in each heat dissipation group can be adjusted according to the specific location of each heat dissipation group. For example, the density of the fin structure 132 that is far away from the main heat source of the battery 100 is relatively low, while the density of the fin structure 132 that is close to the main heat source of the battery 100 is relatively high. This application embodiment does not limit this, and can reasonably select according to the specific structure of the battery 100.

[0058] See also some of the possible implementation methods. Figure 1and Figure 2 As shown, the fin structure 132 in this embodiment includes a plastic component.

[0059] It is understandable that the plastic parts can form a shell and define the accommodating cavity. The heat exchange material is placed inside the accommodating cavity. The low density of the plastic parts is beneficial to the lightweighting of the battery 100. At the same time, plastic has good insulation and corrosion resistance. Using plastic parts can avoid the risk of short circuit caused by contact between the fin structure 132 and the shell 110. In addition, it is beneficial to extend the service life of the fin structure 132, thereby extending the service life of the battery 100.

[0060] Specifically, the plastic parts include at least one of PP (Polypropylene) and PE (polyethylene).

[0061] In practical implementation, PP and PE have lower costs and shorter injection molding cycles. Using PP and PE to make fin structure 132 helps to save the production cost of heat sink 130 and improve the production efficiency of battery 100.

[0062] See also some of the possible implementation methods. Figure 1 As shown, the heat exchange material in this embodiment includes a phase change material.

[0063] It should be noted that phase change materials absorb or release a large amount of heat through phase transitions, while maintaining a nearly constant temperature. This reduces the thermal shock experienced by the heat sink 130, helping to maintain temperature stability within the heat dissipation cavity 1111a. When the battery 100 temperature is high, the phase change material absorbs heat to promote heat dissipation; when the battery 100 temperature is low, the phase change material releases heat to heat the battery 100, thus keeping the battery 100 within a suitable operating temperature range. This helps ensure the efficient and stable operation of the battery 100. Simultaneously, the phase change material stores and releases heat through its own phase change, exhibiting stable cycling without performance degradation. It eliminates the need for active cooling or heating equipment, saving on the installation of fans, coolant circulation devices, and other equipment, thus reducing energy consumption and extending the battery 100's lifespan.

[0064] In addition, phase change materials include different types such as solid-liquid phase change, liquid-gas phase change, and solid-gas phase change. In order to maintain the stability of the heat sink 130, a solid-liquid phase change material can be selected. In this way, the heat exchange material always remains in a solid state on the fin structure 132, and the structure is relatively stable. If a solid-liquid phase change material is selected, a corresponding flow-blocking structure can be set on the fin structure 132 to prevent the heat exchange material from flowing out of the battery 100 when it is converted into a liquid, which would cause the heat sink 130 to fail. Alternatively, a material with a relatively small volume change coefficient when converting from liquid to solid can be selected. Even if part of the phase change material melts from solid to solid, the change range is relatively small, which can prevent the liquid flow from causing the shape of the phase change material to change. Of course, the specific type of phase change material can be reasonably selected according to the actual structure of the battery 100. This application embodiment does not limit this.

[0065] For example, the phase change material includes at least one of linear alkane paraffin, polyethylene glycol, fatty acids, and polyethylene glycol. These materials have strong chemical stability, are not prone to explosion, and their phase change temperature range is close to the suitable operating temperature range of the battery 100. This helps improve the stability of the heat sink 130, ensures the heat dissipation effect of the heat sink 130, and thus ensures that the battery 100 operates under suitable temperature conditions, improving the performance of the battery 100. In addition, the above-mentioned materials have low cost, which helps reduce the production cost of the battery 100, thereby saving the cost of the battery pack 10 or electrical equipment.

[0066] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3 As shown, the fin structure 132 and the inner wall of the heat dissipation cavity 1111a are arranged at intervals in this embodiment of the application.

[0067] It is understandable that when the temperature inside the heat dissipation cavity 1111a is high, the fin structure 132 may expand due to heat. Therefore, a certain gap can be maintained between the fin structure 132 and the inner wall of the heat dissipation cavity 1111a to allow for expansion space. This can prevent the fin structure 132 from being squeezed against the inner wall of the heat dissipation cavity 1111a when it expands, thus avoiding damage to the heat dissipation component 130 or the housing 110. This is beneficial to improving the stability and safety of the battery 100 and extending its service life.

[0068] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3As shown, in this embodiment of the application, the distance between the end of the fin structure 132 away from the support body 131 and the inner wall of the heat dissipation cavity 1111a is 1mm-5mm. For example, the distance between the fin structure 132 and the inner wall of the heat dissipation cavity 1111a can be 1mm, 2mm, 3mm, 4mm or 5mm. Of course, this embodiment of the application does not limit this distance, and the distance can be reasonably selected within the above range according to actual needs.

[0069] It should be noted that if the distance between the fin structure 132 and the inner wall is too small, it will be difficult to leave enough expansion space, which may easily damage the battery 100. If the distance is too large, the fin structure 132 may be too far from the shell 110, affecting the heat exchange efficiency between the fin structure 132 and the shell 110. Therefore, the distance between the fin structure 132 and the inner wall of the heat dissipation cavity 1111a needs to be reasonably set within the above range according to the actual structure of the battery 100 and the suitable operating temperature.

[0070] Furthermore, components such as an expansion force sensor and a temperature sensor that communicate with the control system of the electrical equipment can be installed in the heat dissipation cavity 1111a to detect the internal temperature of the battery 100 and the expansion force of the heat dissipation component 130. When the expansion force is too large or the internal temperature of the battery 100 is too high, an alarm signal can be sent to the user of the electrical equipment in a timely manner through the control system so that the user can take timely measures to reduce safety hazards.

[0071] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3 As shown, the housing 110 of this application embodiment includes: a bottom shell 111 and a cover plate 112, wherein the bottom shell 111 includes a first side plate 1111, a second side plate 1112 and an end plate 1113, the first side plate 1111 is located inside the second side plate 1112, the end plate 1113 is connected to the first end of the first side plate 1111 and the second side plate 1112, so as to define a receiving cavity 1112a together with the first side plate 1111 and the second side plate 1112, the inner side of the first side plate 1111 defines a heat dissipation cavity 1111a, and the second end of the first side plate 1111 and the second side plate 1112 defines an opening; the cover plate 112 is disposed on the opening.

[0072] In some embodiments, the first side plate 1111, the second side plate 1112, the end plate 1113, and the cover plate 112 completely enclose the receiving cavity 1112a, thereby preventing the electrolyte 140 of the battery 100 from leaking out of the receiving cavity 1112a, which is beneficial to improving the safety and reliability of the battery 100. To ensure the heat dissipation effect of the heat dissipation component, the first side plate 1111 can be made of a material with good thermal conductivity so that the heat generated by the battery 100 can be transferred to the heat dissipation cavity 1111a and then released through the heat dissipation component 130. At the same time, the second side plate 1112 forms the outer wall of the battery 100, so a material with high structural strength can be selected to improve the structural stability of the battery 100. Of course, the specific shape and material of the bottom shell 111 and the cover plate 112 are not limited in this embodiment, and can be reasonably selected according to actual needs.

[0073] Furthermore, the first side plate 1111, the second side plate 1112, and the end plate 1113 can be integrally formed, or they can be formed independently and then fixed together by welding, bonding, or other methods. This application embodiment does not impose any limitations on this. The battery cell 120 is disposed between the first side plate 1111 and the second side plate 1112. The battery cell 120 can be wound around the outside of the first side plate 1111 and disposed in the receiving cavity 1112a, with its shape corresponding to the shape of the first side plate 1111 and the second side plate 1112. The annular battery 100 structure is also conducive to realizing the design of a large-capacity battery 100, improving the space utilization rate in the receiving cavity 1112a, and improving the energy density of the battery 100.

[0074] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment of the application, the heat dissipation cavity 1111a penetrates at least one of the end plate 1113 and the cover plate 112; or, the end plate 1113 and the cover plate 112 respectively block both ends of the heat dissipation cavity 1111a.

[0075] It is understandable that when the heat dissipation cavity 1111a penetrates the end plate 1113 and the cover plate 112, the heat dissipation cavity 1111a is connected to the outside of the battery 100, and the air circulation is strong, which is conducive to improving the heat dissipation efficiency of the heat dissipation component 130. At the same time, the heat dissipation component 130 can be installed on the end plate 1113 or the cover plate 112, and the end plate 1113 or the cover plate 112 can block one end of the heat dissipation cavity 1111a, or the end plate 1113 and the cover plate 112 can block both ends of the heat dissipation cavity 1111a respectively, which can protect the heat dissipation component 130 and help extend the service life of the battery 100.

[0076] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3As shown, the housing 110 in this embodiment of the application further includes: a pole assembly 113, which passes through the cover plate 112 and is electrically connected to the battery cell 120.

[0077] In a specific implementation, the battery cell 120 is electrically connected to other batteries 100 in the battery pack 10 or the circuit system in the electrical device through the terminal assembly 113. A through hole can be opened on the cover plate 112, and the terminal assembly 113 is inserted through the cover plate 112 and then fixed to the cover plate 112 by mechanical riveting or laser welding. This application embodiment does not limit this.

[0078] Furthermore, an explosion-proof valve 1121 can be installed on the cover plate 112 or the end plate 1113. When the battery 100 experiences thermal runaway and generates a large amount of high-temperature and high-pressure gas in the containment cavity 1112a, the high-temperature and high-pressure gas can be quickly released from the explosion-proof valve 1121 to prevent an explosion, which is beneficial to improving the safety and reliability of the battery 100. Meanwhile, an injection hole 1122 can be provided on the cover plate 112 or the end plate 1113. When assembling the battery 100, the cell 120 can be placed into the receiving cavity 1112a, and then the cover plate 112 can be welded to the bottom shell 111. Finally, the electrolyte 140 is injected into the receiving cavity 1112a through the injection hole 1122. After the injection is completed, the injection hole 1122 can be sealed by laser welding, rubber plug or metal sheet sealing. This can prevent the electrolyte 140 from leaking out during the assembly process, make it easier to control the amount of electrolyte 140 injected into the receiving cavity 1112a, and at the same time help to ensure the sealing of the receiving cavity 1112a and prevent the battery 100 from leaking.

[0079] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3 As shown, the pole assembly 113 in this embodiment is annular and is arranged around the heat dissipation cavity 1111a.

[0080] In this way, the terminal assembly 113 can achieve 360° heat diffusion, which can avoid excessive local temperature, improve the temperature uniformity of the battery 100, reduce temperature difference, and improve the heat dissipation efficiency of the battery 100. Furthermore, the annular terminal assembly 113 can disperse the stress generated by thermal expansion, which helps to avoid cracking of the connection between the terminal assembly 113 and the cover plate 112 or increased contact resistance due to unilateral thermal expansion, thereby improving the reliability of the electrical connection between the battery 100 and the circuit system.

[0081] See Figure 1 and Figure 4 As shown, this application embodiment also provides a battery pack 10, including: a substrate 11 and any of the above-mentioned batteries 100, wherein there are multiple batteries 100, and the multiple batteries 100 are arranged on the substrate 11.

[0082] The structure and working principle of battery 100 have been described in detail in the above embodiments, and will not be repeated here.

[0083] In this embodiment of the application, by setting the battery 100, the overall heat dissipation efficiency of the battery pack 10 can be improved, which is beneficial to improving the safety and performance of the battery pack 10 and extending the service life of the battery pack 10.

[0084] See also some of the possible implementation methods. Figure 1 , Figure 4 and Figure 5 As shown, in the embodiments of this application, the heat sink 130 of each battery 100 is connected to the substrate 11, and / or the casing 110 of each battery 100 is connected to the substrate 11.

[0085] In some embodiments, when the heat dissipation cavity 1111a penetrates the end plate 1113, multiple heat dissipation components 130 can be fixed on the substrate 11 according to a preset position, and then the heat dissipation cavity 1111a of the housing 110 can be aligned with the heat dissipation component 130 for assembly. The end plate 1113 of the battery 100 and the substrate 11 can be fixed together by structural adhesive or the like. In this way, the housing 110 and the heat dissipation component 130 of the battery 100 can be manufactured separately. When assembling the battery pack 10, the heat dissipation component 130 can be placed into the heat dissipation cavity 1111a, which is beneficial to improve the assembly efficiency of the battery pack 10. At the same time, the connection between the heat dissipation component 130 and the substrate 11 can also improve the stability of the heat dissipation component 130.

[0086] In one possible implementation, the bottom shell 111 is a one-piece molded structure. In this way, the bottom shell 111 has high structural strength and stability, which can ensure good isolation between the heat dissipation cavity 1111a and the receiving cavity 1112a, and also helps to ensure the positional stability of the battery cell 120 and the heat sink 130.

[0087] See Figure 1 and Figure 4 As shown in the figure, this application embodiment also provides an electrical device, including any of the above-mentioned batteries 100 or battery packs 10.

[0088] The structure and working principle of the battery pack 10 have been described in detail in the above embodiments, and will not be repeated here.

[0089] In this embodiment, the power supply can be an electric vehicle, and the battery pack 10 can be a battery pack for the electric vehicle, or it can be a household appliance or other electrical equipment. This embodiment does not limit this. By setting the battery 100 or battery pack 10, the battery 100 or battery pack 10 in the electrical equipment can dissipate heat efficiently and have a longer service life, which is beneficial to improving the battery life of the electrical equipment, improving the performance and user experience of the electrical equipment, and ensuring the safety and reliability of the electrical equipment.

[0090] In summary, this application provides a battery 100, a battery pack 10, and an electrical device. The battery 100 includes a housing 110, a battery cell 120, and a heat sink 130. The housing 110 includes a first side plate 1111, a second side plate 1112, an end plate 1113, and a cover plate 112. The first side plate 1111, the second side plate 1112, and the end plate 1113 together form a receiving cavity 1112a. The heat sink 1111a is defined inside the first side plate 1111. The cover plate 112 covers the opening of the receiving cavity 1112a. The battery cell 120 and the electrolyte 140 of the battery 100 are both provided with... The receiving cavity 1112a is sealed to prevent the electrolyte 140 from flowing out. The heat sink 130 is disposed in the heat dissipation cavity 1111a and dissipates heat by exchanging heat with the first side plate 1111. The first side plate 1111 separates the receiving cavity 1112a from the heat dissipation cavity 1111a, thus avoiding direct contact between the heat sink 130 and the electrolyte 140. This prevents the heat sink 130 from being corroded by the electrolyte 140, which could damage the battery 100 or cause safety hazards. This is beneficial to improving the safety and reliability of the battery 100 and extending its service life.

[0091] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0092] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0093] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0094] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized in that, include: The housing has a receiving cavity with an annular cross-section, and the housing further defines a heat dissipation cavity located radially inward of the receiving cavity, the heat dissipation cavity and the receiving cavity being separated by the housing; The battery cell is disposed within the receiving cavity; A heat sink is disposed in the heat dissipation cavity, and the heat sink is used to exchange heat with the housing.

2. The battery according to claim 1, characterized in that, The heat sink includes: A supporting body extends along the axial direction of the housing and passes through the heat dissipation cavity; A finned structure is provided on the side wall of the supporting body, and a heat exchange material is provided on the inner side of the finned structure.

3. The battery according to claim 2, characterized in that, The fin structure is multiple, and the multiple fin structures are distributed along the circumferential and / or axial direction of the support body.

4. The battery according to claim 3, characterized in that, The fin structure is divided into multiple heat dissipation groups, which are distributed along the axial direction of the support body. Each heat dissipation group includes multiple fin structures distributed circumferentially along the support body.

5. The battery according to claim 2, characterized in that, The fin structure includes plastic components.

6. The battery according to claim 5, characterized in that, The plastic part is made of PP or PE.

7. The battery according to claim 2, characterized in that, The heat exchange material includes a phase change material.

8. The battery according to claim 7, characterized in that, The phase change material is a straight-chain alkane paraffin, polyethylene glycol, fatty acid, or polyethylene glycol.

9. The battery according to claim 2, characterized in that, The fin structure is arranged at intervals with the inner wall of the heat dissipation cavity.

10. The battery according to claim 9, characterized in that, The distance between the end of the fin structure furthest from the supporting body and the inner wall of the heat dissipation cavity is 1mm-5mm.

11. The battery according to any one of claims 1-10, characterized in that, The housing includes: The bottom shell includes a first side plate, a second side plate, and an end plate. The first side plate is located inside the second side plate. The end plate is connected to the first end of the first side plate and the second side plate to define the receiving cavity together with the first side plate and the second side plate. The inner side of the first side plate defines the heat dissipation cavity. The second ends of the first side plate and the second side plate define an opening. A cover plate is placed over the opening.

12. The battery according to claim 11, characterized in that, The heat dissipation cavity extends through at least one of the end plate and the cover plate; or... The end plate and the cover plate respectively seal both ends of the heat dissipation cavity.

13. The battery according to claim 11, characterized in that, The housing also includes: A terminal assembly is inserted through the cover plate and electrically connected to the battery cell.

14. The battery according to claim 13, characterized in that, The electrode assembly is ring-shaped and is arranged around the heat dissipation cavity.

15. The battery according to claim 11, characterized in that, The bottom shell is a one-piece molded structure.

16. A battery pack, characterized in that, include: substrate; The battery according to any one of claims 1-15, wherein there are multiple batteries arranged on the substrate.

17. The battery pack according to claim 16, characterized in that, The heat sink of each battery is connected to the substrate, and / or the casing of each battery is connected to the substrate.

18. An electrical appliance, characterized in that, Includes the battery according to any one of claims 1-15, or the battery pack according to claim 16 or 17.

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