Casing assembly, battery cell, battery and electric device

Abstract

The present application relates to the technical field of batteries. Provided are a casing assembly, a battery cell, a battery and an electric device. The casing assembly comprises a casing and a sealing assembly, wherein a through hole is provided in the casing; the sealing assembly blocks the through hole; an electrically conductive member is covered with an insulating member of the sealing assembly, and is provided with a first contact portion and a second contact portion; a hollow inner cavity is formed in a connecting member; the insulating member is filled in the inner cavity; the connecting member is connected to the casing; and the first contact portion and the second contact portion are respectively located on the inner side and the outer side of the casing. In the present application, by means of providing the casing assembly provided with the sealing assembly, and using the sealing assembly to block the through hole of the casing, the occurrence of liquid leakage can be effectively reduced, thus improving a sealing effect.

Description

Housing components, battery cells, batteries and electrical equipment

[0001] This application refers to Chinese patent application No. 202310703637.6 filed on June 14, 2023, entitled “Shell assembly, battery cell, battery and electrical equipment”, which is incorporated into this application in its entirety by reference. Technical Field

[0002] The present application relates to the field of battery technology, and in particular provides a housing assembly, a battery cell, a battery, and an electrical device. Background Art

[0003] In the battery heat propagation system, the real out-of-control state of the battery cell is simulated mainly by arranging heating devices such as heating films inside the battery cell, and heating the battery cell by the heating film to trigger the out-of-control of the battery cell.

[0004] In the prior art, when a heating device, such as a heating film, is placed inside a battery cell, a through-hole must be opened in the battery cell housing to allow the power cord of the heating device to pass through. However, this method of routing the power cord through the through-hole is prone to leakage of the battery cell electrolyte, which may leak between the power cord and the through-hole.

[0005] Application Contents

[0006] The purpose of the embodiments of the present application is to provide a housing assembly, a battery cell, a battery and an electrical device, aiming to solve the problem in the related art that the power cord is easily leaked when it is passed through the housing.

[0007] The technical solution adopted in the embodiment of this application is:

[0008] In the first aspect, an embodiment of the present application provides a shell assembly, which is applied to a battery cell. The shell assembly includes a shell and a sealing assembly. A through hole is opened on the shell, and the sealing assembly is configured to seal the through hole; the sealing assembly includes a conductive part, an insulating part and a connecting part. The insulating part is covered on the conductive part, and the conductive part has a first contact portion and a second contact portion respectively exposed to the insulating part; the connecting part forms a hollow inner cavity, the insulating part fills the inner cavity, the connecting part is configured to be connected to the shell, and the first contact portion and the second contact portion are respectively located on the inner side and the outer side of the shell.

[0009] Beneficial effects of the embodiments of the present application: The shell assembly provided by the embodiments of the present application has a through hole opened on the shell, and the sealing assembly is sealed at the through hole, the connecting member of the sealing assembly is connected to the shell, and the insulating member covers the conductive member and is arranged in the inner cavity of the connecting member, so that the first contact portion and the second contact portion of the conductive member are respectively located on the inner side and the outer side of the shell, that is, the first contact portion and the second contact portion are exposed on the inner side and the outer side of the shell, respectively. Taking the first contact portion exposed on the inner side of the shell as an example, the power line of the heating device (such as a heating film) provided in the shell can be electrically connected to the first contact portion, and the second connection portion exposed on the outside of the shell can be connected to an external power supply to enable the heating device in the shell to be powered on; the shell assembly provided by the embodiments of the present application has a through hole opened on the shell, and the sealing assembly is used to seal the through hole, and the heating device inside the shell and the external power supply outside the shell are electrically connected by the conductive member. While ensuring the normal use of the heating device, the sealing effect of the sealing assembly blocking the through hole is better, which effectively reduces the occurrence of leakage.

[0010] In some embodiments, the housing includes an end cover, and the through hole is opened on the end cover.

[0011] By adopting the above technical solution, it can be understood that the thickness of the end cover is thicker than other parts of the shell, and the structural strength of the end cover is better. Therefore, opening a through hole on the end cover can reduce the probability of damage to the end cover.

[0012] In some embodiments, the thickness of the insulating member is greater than the thickness of the connecting member.

[0013] By adopting the above-mentioned technical solution, the thickness of the insulating part is set to be greater than the thickness of the connecting part, and the insulating part can extend out of the connecting part on at least one side in the thickness direction, thereby ensuring the contact area between the insulating part and the connecting part, thereby improving the connection strength between the insulating part and the connecting part.

[0014] In some embodiments, the connecting member has a first end surface, which is configured to face outside the housing; and the insulating member covers at least a portion of the first end surface.

[0015] By adopting the above technical solution, the insulating member covers at least a portion of the first end surface, thereby increasing the contact area between the insulating member and the connecting member, further improving the connection strength between the insulating member and the connecting member, and also improving the effect of preventing electrolyte leakage.

[0016] In some embodiments, the insulating member includes a first insulating portion and a second insulating portion, the first insulating portion is disposed in the inner cavity, the second insulating portion protrudes outside the first end surface, the second insulating portion abuts against the first end surface and covers the open end of the inner cavity.

[0017] By adopting the above-mentioned technical solution, the first insulating portion of the insulating member is arranged in the inner cavity and connected to the connecting member, and the second insulating portion of the insulating member abuts against the first end face and covers the open end of the inner cavity, thereby increasing the contact area between the insulating member and the connecting member, effectively improving the effect of preventing electrolyte leakage between the insulating member and the connecting member.

[0018] In some embodiments, the first end surface protrudes outward to form a first annular protrusion, and the inner wall surface of the first annular protrusion abuts against the outer wall surface of the second insulating portion.

[0019] By adopting the above-mentioned technical solution, the inner side wall of the first annular protrusion of the first end face abuts against the outer side wall of the second insulating portion, thereby further increasing the contact area between the insulating part and the connecting part, further improving the effect of preventing electrolyte leakage between the insulating part and the connecting part, and at the same time improving the connection strength between the insulating part and the connecting part.

[0020] In some embodiments, the connecting member has a second end surface, which is configured to face the inside of the housing; and the insulating member covers at least a portion of the second end surface.

[0021] By adopting the above technical solution, the insulating member covers at least part of the second end surface, thereby increasing the contact area between the insulating member and the connecting member, further improving the connection strength between the insulating member and the connecting member, and also improving the effect of preventing electrolyte leakage.

[0022] In some embodiments, the insulating member includes a first insulating portion and a third insulating portion, the first insulating portion is disposed in the inner cavity, the third insulating portion protrudes outside the second end surface, the third insulating portion abuts against the second end surface and covers the open end of the inner cavity.

[0023] By adopting the above-mentioned technical solution, the first insulating portion of the insulating member is arranged in the inner cavity and connected to the connecting member, and the third insulating portion of the insulating member abuts against the second end face and covers the open end of the inner cavity, thereby increasing the contact area between the insulating member and the connecting member, effectively improving the effect of preventing electrolyte leakage between the insulating member and the connecting member, and at the same time improving the connection strength between the insulating member and the connecting member.

[0024] In some embodiments, the second end surface protrudes outward to form a second annular protrusion, and the inner wall surface of the second annular protrusion abuts against the outer wall surface of the third insulating portion.

[0025] By adopting the above-mentioned technical solution, the inner side wall of the second annular protrusion of the second end face abuts against the outer side wall of the third insulating part, thereby further increasing the contact area between the insulating part and the connecting part, further improving the effect of preventing electrolyte leakage between the insulating part and the connecting part, and at the same time improving the connection strength between the insulating part and the connecting part.

[0026] In some embodiments, the shell further includes an insulating layer, which is disposed on the inner side surface of the shell and has an avoidance hole. The third insulating portion and the second annular protrusion are both disposed in the avoidance hole.

[0027] By adopting the above technical solution, an avoidance hole is opened on the insulating layer, and the avoidance hole is used to accommodate the third insulating portion and the second annular convex portion, thereby preventing the third insulating portion and the second annular convex portion from protruding out of the insulating layer.

[0028] In some embodiments, the connector has a connecting end surface configured to be sealingly connected to a hole wall of the through hole.

[0029] By adopting the above technical solution, the connecting end face and the hole wall of the through hole are sealed and connected, so that the sealing performance of the sealing component blocking the through hole is better.

[0030] In some embodiments, the diameter of the through hole tends to decrease in a direction along the axial direction of the through hole and toward the inside of the housing.

[0031] By adopting the above technical solution, the aperture of the through hole tends to decrease in the axial direction and in the direction toward the inside of the shell, so that when the sealing assembly is arranged at the through hole, the hole wall of the through hole exerts a supporting force on the sealing assembly to facilitate the connection operation between the sealing assembly and the shell.

[0032] In some embodiments, the outer diameter of the connecting member tends to decrease in the thickness direction of the connecting member.

[0033] By adopting the above-mentioned technical solution, the outer diameter of the connector tends to decrease along the thickness direction of the connector. When the sealing assembly is sealed at the through hole, the outer structure of the connector corresponds to the hole shape of the through hole, and the connecting end face of the connector and the hole wall of the through hole can have more contact area, thereby improving the sealing performance and connection strength between the connector and the shell.

[0034] In some embodiments, a pressure relief mechanism is provided on the end cover, and the through hole is located on the peripheral side of the pressure relief mechanism.

[0035] By adopting the above technical solution, it can be understood that the thickness of the end cover near the pressure relief mechanism is thicker than the thickness of the end cover away from the pressure relief mechanism. Therefore, opening a through hole at the end cover on the peripheral side of the pressure relief mechanism can reduce the probability of damage to the end cover.

[0036] In some embodiments, the first contact portion is configured to be disposed outside the housing, and the sealing assembly further includes an insulating sleeve, which is configured to be sleeved on the first contact portion.

[0037] By adopting the above technical solution, when the first contact portion does not need to be connected to an external power supply, the insulating sleeve can be placed on the first contact portion to reduce the risk of accidental contact between the first contact portion and a charged body such as a battery cell pole.

[0038] In the second aspect, an embodiment of the present application also provides a battery cell, which includes a battery cell assembly, a heating device, and a shell assembly as described above, wherein the battery cell assembly is arranged on the inner side of the shell assembly, the heating device is arranged on the battery cell assembly, the second contact portion is configured to be arranged on the inner side of the shell, and the heating device is electrically connected to the second contact portion.

[0039] Beneficial effects of the embodiments of the present application: The battery cell provided by the embodiments of the present application includes the above-mentioned shell assembly. On the basis that the shell assembly has better sealing performance and a lower probability of electrolyte leakage, the battery cell is less likely to leak.

[0040] In a third aspect, an embodiment of the present application further provides a battery, which includes at least the battery cell as described above.

[0041] Beneficial effects of the embodiments of the present application: The battery provided by the embodiments of the present application includes the above-mentioned battery cells. On the basis of a low probability of leakage of the battery cells, the battery has better sealing and stability.

[0042] In a fourth aspect, an embodiment of the present application further provides an electrical device, which includes at least the battery as described above.

[0043] Beneficial effects of the embodiments of the present application: The electrical equipment provided by the embodiments of the present application includes the above-mentioned battery. On the basis of the battery having better sealing and stability, the electrical equipment also has better stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or related technologies. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] FIG1 is a schematic diagram of the exploded structure of a battery provided in an embodiment of the present application;

[0046] FIG2 is a schematic diagram of the exploded structure of a battery cell provided in an embodiment of the present application;

[0047] FIG3 is a schematic structural diagram of a sealing assembly provided in an embodiment of the present application;

[0048] FIG4 is a schematic structural diagram of a connector of a sealing assembly provided in an embodiment of the present application;

[0049] FIG5 is a schematic diagram of a structure in which a through hole is provided on a housing according to an embodiment of the present application;

[0050] FIG6 is a schematic cross-sectional view of the sealing assembly provided in an embodiment of the present application when sealing a through hole;

[0051] FIG7 is a schematic diagram of the assembly structure of the sealing assembly when the through hole provided in the end cover according to an embodiment of the present application.

[0052] Among them, the reference numerals in the figures are:

[0053] 1100, battery;

[0054] 10. Battery box; 11. First part; 12. Second part;

[0055] 20. Battery cell; 21. End cap; 22. Housing; 23. Cell assembly; 231. Tab; 211. Electrode terminal; 2111. Positive electrode column; 2112. Negative electrode column;

[0056] 100, housing assembly; 110, housing; 111, through hole; 112, insulation layer; 1121, avoidance hole;

[0057] 120. Sealing assembly;

[0058] 121, conductive member; 1211, first contact portion; 1212, second contact portion;

[0059] 122, insulating member; 1221, first insulating portion; 1222, second insulating portion; 1223, third insulating portion;

[0060] 123. Connecting piece; 1231. First end face; 1232. Second end face; 12321. Second annular protrusion; 1233. Inner cavity; 1234. Connecting end face. DETAILED DESCRIPTION

[0061] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the accompanying drawings are intended to cover non-exclusive inclusions.

[0063] In the description of the embodiments of the present application, the terms "length", "width", "thickness", "inside", "outside", "up", "down", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0064] The terms "first," "second," and the like are used solely for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. For example, the terms "first guide member" and "second guide member" are used solely to distinguish between the different guide members and do not define their order. The first guide member could also be named "second guide member," and the second guide member could also be named "first guide member" without departing from the scope of the various described embodiments. Furthermore, the terms "first," "second," and the like do not necessarily specify that the features being referred to are different.

[0065] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connected", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. The meaning of "plurality" is at least two, that is, two or more.

[0066] In this application, "and / or" is simply a way to describe the relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0067] It should be noted that, in this application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to indicate examples, illustrations or explanations. Any embodiment or design described in this application as "in some embodiments", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in some embodiments", "exemplarily", "for example" is intended to present related concepts in a concrete way, meaning that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0068] In order to make the purpose, technical solutions and advantages of this application more clear, this application is further described in detail below with reference to the accompanying drawings and embodiments.

[0069] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0070] In order to improve the safety performance of the battery, a battery heat spread system is generally used to simulate the real out-of-control state of the battery cell, so as to determine the thermal runaway triggering conditions of the battery. In the related art, a heating film or other heating device is arranged at the battery cell inside the battery cell, a through hole is opened on the shell of the battery cell, and the power line of the heating device is passed through the through hole and connected to an external power supply, so that the heating device is powered on to perform a heat spread simulation operation. When sealing the through hole through which the power line passes, a sealant is mainly used to fill and coat the through hole so that the sealant forms a seal on the through hole. However, the method of using sealant to fill and coat the through hole to form a seal is prone to the problem of electrolyte leakage. For example, the electrolyte may corrode the sealant and leak, or the electrolyte may leak from between the sealant and the power line, or the electrolyte may leak from between the insulating sheath and the conductive copper core of the power line, etc.

[0071] Based on the above considerations, in order to solve the problem of electrolyte leakage that may occur when the power cord is passed through the shell, a shell assembly is designed. By opening a through hole in the shell of the shell assembly and sealing the through hole with a sealing assembly, the connector of the sealing assembly is connected to the shell, the insulating member is wrapped around the conductive member and arranged in the inner cavity of the connector, and the first contact portion and the second contact portion of the conductive member are respectively exposed from the insulating member and are respectively located on the inner side and the outer side of the shell, that is, the first contact portion and the second contact portion are respectively located on the side of the shell facing the inside and the side of the shell facing the outside. As a result, the heating device arranged at the battery core inside the shell can connect its power cord to the first contact portion or the second contact portion located on the inner side of the shell, and the second contact portion or the first contact portion located on the outer side of the shell can be electrically connected to the external power supply to achieve the purpose of energizing the heating device. By sealing the sealing component at the through hole, the power cord inside the shell only needs to be connected to the portion of the conductive part exposed from the insulating part and located on the inner side of the shell, so that the power cord does not need to pass through the shell, effectively avoiding the leakage of electrolyte from between the insulating outer skin and the conductive copper core of the power cord; at the same time, the insulating part, conductive part and connecting part of the sealing component are an integrated structure, and the probability of electrolyte leakage from the inside of the sealing component is low. Therefore, the probability of leakage generated by the sealing method of sealing the sealing component to the shell is low, and the leakage of electrolyte is effectively alleviated.

[0072] The housing assembly disclosed in the embodiments of this application can be used, but is not limited to, in electrical equipment such as experimental equipment, vehicles, ships, or aircraft. A power supply system comprising the housing assembly and battery cell assembly disclosed in this application can be constructed, thereby improving the sealing performance of the housing assembly and reducing the probability of electrolyte leakage.

[0073] The battery cells disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, experimental equipment, heat propagation simulation equipment, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0074] For the convenience of description, the following embodiments are described by taking an electrical device according to an embodiment of the present application as a heat spreading system.

[0075] The heat spread system includes a battery, an external power supply, and a heating device. The heating device is located inside the battery and is electrically connected to the external power supply. When powered on, the heating device releases heat and heats the interior of the battery to simulate thermal runaway. The heating device can be, but is not limited to, a heating film or heating wire. The external power supply is a power supply device located outside the battery and exists independently of the battery; it is used to provide electrical energy to the heating device.

[0076] As shown in FIG1 , a battery 1100 includes a battery case 10 and battery cells, with the battery cells being housed within the battery case 10. The battery case 10 is used to provide a storage space for the battery cells and can have a variety of structures. In some embodiments, the battery case 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cells 20. The second portion 12 can be a hollow structure with one end open, and the first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 can also be hollow structures with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the battery case 10 formed by the first portion 11 and the second portion 12 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0077] In battery 1100, there may be multiple battery cells, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells connected in both series and parallel. Specifically, the battery cells may be battery cells 20 or battery modules. A battery module is a modular component formed by assembling multiple battery cells 20. The heating device is housed within the battery cells 20.

[0078] In one specific embodiment, multiple battery cells 20 can be directly connected in series, parallel, or hybrid, and the entire battery cell 20 can then be housed within the battery case 10. Alternatively, the battery 1100 can be constructed by first connecting multiple battery cells 20 in series, parallel, or hybrid to form a battery module, which is then connected in series, parallel, or hybrid to form a complete unit and housed within the battery case 10. The battery 1100 can also include other structures. For example, the battery 1100 can also include a busbar assembly for electrically connecting the multiple battery cells 20. Specifically, a battery unit can be a battery cell or a battery module, where a battery module refers to a modular component formed by assembling multiple battery cells 20.

[0079] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0080] Please refer to Figures 2 and 6. Figure 2 is a schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that makes up the battery 1100. As shown in Figure 2, the battery cell 20 includes a housing assembly 100, a battery cell assembly 23, and other functional components. The heating device is disposed inside the housing assembly 100 and is used to heat the battery cell assembly 23 to simulate a thermal runaway state. The housing assembly 100 includes a housing 110, and the housing 110 includes an end cap 21 and an outer shell 22.

[0081] The end cap 21 refers to a component that covers the opening of the outer shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the outer shell 22 to match the outer shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 211 can be provided on the end cap 21. The electrode terminal 211 includes a positive electrode column 2111 and a negative electrode column 2112. The positive electrode column 2111 and the negative electrode column 2112 can be used to electrically connect to the battery cell assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 may also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. Understandably, to ensure structural strength, the thickness of the end cap 21 tends to be thicker where the pressure relief mechanism is located. The end cap 21 may be made of a variety of materials, including, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating member may be provided on the inside of the end cap 21 to isolate the electrical components within the housing 22 from the end cap 21, thereby reducing the risk of short circuits. Exemplarily, the insulating member may be made of plastic, rubber, or the like. Understandably, because the end cap 21 is provided with the functional components described above and is less susceptible to deformation during compression or collision, it possesses superior structural strength and is therefore thicker than the housing 22.

[0082] The outer shell 22 is a component that cooperates with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the battery cell assembly 23, electrolyte, and other components. The outer shell 22 and the end cap 21 can be separate components. An opening can be provided in the outer shell 22, and the end cap 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and outer shell 22 can be integrated. Specifically, the end cap 21 and outer shell 22 can form a common connection surface before other components are inserted into the shell. When the interior of the outer shell 22 needs to be enclosed, the end cap 21 is placed over the outer shell 22. The outer shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the outer shell 22 can be determined based on the specific shape and size of the battery cell assembly 23. The outer shell 22 can be made of a variety of materials, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0083] The cell assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more cell assemblies 23 may be contained in the outer shell 22. The cell assembly 23 is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets; the heating device may adopt a heating film, which may be attached to the cell assembly 23. The parts of the positive and negative electrode sheets with active materials constitute the main body of the cell assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 231. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 1100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 231 connects the electrode terminals to form a current loop.

[0084] In one embodiment of the present application, in combination with Figures 2 to 5 and Figure 7, a shell assembly 100 is provided, which is applied to a battery cell 20, and the shell assembly 100 includes a shell 110 and a sealing assembly 120, and a through hole 111 is opened on the shell 110, and the sealing assembly 120 is configured to seal the through hole 111; the sealing assembly 120 includes a conductive member 121, an insulating member 122 and a connecting member 123, the insulating member 122 is coated on the conductive member 121, and the conductive member 121 has a first contact portion 1211 and a second contact portion 1212 respectively exposed to the insulating member 122; the connecting member 123 is formed with a hollow inner cavity 1233, and the insulating member 122 fills the inner cavity 1233, and the connecting member 123 is configured to be connected to the shell 110, and the first contact portion 1211 and the second contact portion 1212 are respectively located on the inner side and the outer side of the shell 110.

[0085] It is understood that the housing 110 can be the end cap 21, the outer shell 22, or an integral structure formed by assembling the end cap 21 and the outer shell 22. Thus, a through hole 111 is defined in the housing 110. The through hole 111 can be defined at any location on the end cap 21, or at any location on the outer shell 22. The through hole 111 can be, but is not limited to, a circular hole, a square hole, a rectangular hole, or the like.

[0086] It should be understood that the inner side and the outer side of the housing 110 refer to the side of the housing 110 facing inward and the side of the housing 110 facing outward.

[0087] The sealing component 120 is sealed in the through hole 111. Specifically, at least a portion of the sealing component 120 can be inserted into the through hole 111, and the connecting piece 123 of the sealing component 120 is connected to the hole wall of the through hole 111 to achieve sealing; or, the sealing component 120 can be arranged outside the through hole 111, and the sealing component 120 is connected to the surface of the shell 110 on the outside of the shell 110, and the sealing component 120 is sealed at the hole end of the through hole 111 to achieve sealing.

[0088] The conductive member 121 is used to achieve the purpose of electrical conduction; specifically, the conductive member 121 can be, but is not limited to, a metal conductor, an alloy conductor, a polymer conductor, etc. For example, the conductive member 121 can be a copper conductor, a graphite conductor, etc.

[0089] It can be understood that the conductive member 121 is used to electrically connect to the external power supply and the heating device (such as a heating film, etc.) in the shell 110. Therefore, the conductive member 121 includes a first conductor and a second conductor. The first conductor is used to connect to the positive pole of the external power supply and the positive power line of the heating device, and the second conductor is used to connect to the negative pole of the external power supply and the negative power line of the heating device.

[0090] Specifically, the conductive member 121 may include two conductors spaced apart from each other, one end of each conductor being exposed on one side of the insulating member 122 and forming a first contact portion 1211, and the other end of each conductor being exposed on the opposite side of the insulating member 122 and forming a second contact portion 1212. It is understood that the first contact portion 1211 and the second contact portion 1212 may be, but are not limited to, structures such as protrusions, contacts, or wires exposed on the insulating member 122.

[0091] The insulating member 122 is used to cover the conductive member 121 so that the conductive member 121 and the connecting member 123 are insulated from each other, and the two conductors of the conductive member 121 are also insulated from each other. Specifically, the insulating member 122 can be formed into a block structure by injection molding and cover the conductive member 121 so that the first contact portion 1211 and the second contact portion 1212 of the conductive member 121 are exposed from the insulating member 122. The insulating member 122 can be an organic insulator, such as a plastic insulator or a rubber insulator. The insulating member 122 can also be an inorganic insulator, such as a glass insulator or a porcelain insulator. At the same time, the insulator can be, but is not limited to, a block, a sphere, a cylinder, or the like.

[0092] The connector 123 is used to connect to the housing 110. The connector 123 may be, but is not limited to, a metal connector or an alloy connector. Specifically, the connector 123 may be a copper connector, an aluminum alloy connector, a stainless steel connector, etc. The connector 123 may be connected to the housing 110 by welding the connector 123 to the housing 110 or by being threaded onto the housing 110.

[0093] The connector 123 may be an annular structure having a hollow inner cavity 1233. The insulating member 122 may be wrapped around the conductive member 121 and filled in the inner cavity 1233, so that the insulating member 122, the conductive member 121, and the connector 123 form an integrated structure. Specifically, in some specific embodiments, the insulating member 122 may be filled and fixed in the inner cavity 1233 of the connector 123 by injection molding.

[0094] Among them, the connection method between the insulating part 122 and the connecting part 123 can be that the insulating part 122 is integrally formed in the inner cavity 1233 of the connecting part 123 by injection molding and is fixedly connected to the connecting part 123; or, the insulating part 122 is filled in the inner cavity 1233 of the connecting part 123, and the insulating part 122 is abutted and clamped on the connecting part 123 by its own elastic force; or, the insulating part 122 is adhesively fixed to the connecting part 123; or, a card slot can be opened on the insulating part 122, and a corresponding card block can be set on the connecting part 123, and the insulating part 122 and the connecting part 123 are connected by utilizing the card connection between the card block and the card slot.

[0095] For example, in some specific embodiments, the housing 110 includes an end cap 21, which is provided with a circular through-hole 111; the sealing assembly 120 includes an annular aluminum pressing sheet, an insulating injection molded part is injection-molded in the cavity of the aluminum pressing sheet, and the injection molded part is covered with two conductor terminals arranged at intervals, and the two conductor terminals are respectively exposed on the insulating part 122. During assembly, the sealing assembly 120 is sealed in the through-hole 111, and the aluminum pressing sheet can be inserted into the through-hole 111 so that the outer wall of the aluminum pressing sheet contacts the hole wall of the through-hole 111; then the aluminum pressing sheet and the end cap 21 are welded together so that the aluminum pressing sheet and the end cap 21 are welded into one body, thereby achieving the sealing of the through-hole 111 by the sealing assembly 120.

[0096] The housing assembly 100 provided in the embodiment of the present application has a through hole 111 opened on the housing 110, and the sealing assembly 120 is sealed at the through hole 111, the connector 123 of the sealing assembly 120 is connected to the housing 110, and the insulating member 122 covers the conductive member 121 and is arranged in the inner cavity 1233 of the connector 123, so that the first contact portion 1211 and the second contact portion 1212 of the conductive member 121 are respectively located on the inner side and the outer side of the housing 110, that is, the first contact portion 1211 and the second contact portion 1212 are respectively exposed on the inner side and the outer side of the housing 110, and the first contact portion 1211 is exposed on the inner side of the housing 110 as an example, and is arranged on the housing The power line of the heating device (such as a heating film) in 110 can be electrically connected to the first contact part 1211, and the second connection part exposed on the outside of the shell 110 can be connected to an external power supply to enable the heating device in the shell 110 to be powered on; the shell assembly 100 provided in the embodiment of the present application, by opening a through hole 111 on the shell 110, and using a sealing assembly 120 to seal the through hole 111, and using a conductive member 121 to electrically connect the heating device inside the shell 110 and the external power supply outside the shell 110. While ensuring the normal use of the heating device, the sealing effect of the sealing assembly 120 blocking the through hole 111 is better, which effectively reduces the occurrence of leakage.

[0097] Referring to FIG. 3 to FIG. 6 , in some embodiments, the housing 110 includes an end cover 21 , and the through hole 111 is defined in the end cover 21 .

[0098] Understandably, since the end cap requires higher structural strength, the end cap is thicker than other parts of the housing 110. Since the end cap has a relatively stronger structural strength, the through hole 111 is provided on the end cap, and thus the through hole 111 has a lower impact on the end cap and the structural strength of the housing 110.

[0099] Referring to FIG. 3 , in some embodiments, the thickness of the insulating member 122 is greater than the thickness of the connecting member 123 .

[0100] The thickness of the insulating member 122 is set to be greater than the thickness of the connecting member 123, and the insulating member 122 can extend out of the connecting member 123 on at least one side in the thickness direction, thereby ensuring the contact area between the insulating member 122 and the connecting member 123, so as to improve the connection strength between the insulating member 122 and the connecting member 123; at the same time, it can also improve the sealing between the insulating member 122 and the connecting member 123, thereby improving the anti-leakage effect of the sealing assembly 120.

[0101] For example, in some specific embodiments, the connecting member 123 can be an annular aluminum pressing plate, and the insulating member 122 can be a cylindrical insulating block. The insulating block is passed through the inner cavity 1233 of the annular aluminum pressing plate, and the opposite ends of the insulating block protrude outward from the opposite side surfaces of the annular aluminum pressing plate.

[0102] 3 to 5 , in some embodiments, the connecting member 123 has a first end surface 1231 , and the first end surface 1231 is configured to face the outside of the housing 110 ; the insulating member 122 covers at least a portion of the first end surface 1231 .

[0103] It can be understood that the first end surface 1231 refers to the end surface of the connecting member 123 facing the outside of the shell 110 when the connecting member 123 is connected to the shell 110.

[0104] When the insulating member 122 fills the inner cavity 1233 of the connecting member 123, an annular gap will be formed between the insulating member 122 and the first end surface 1231 of the connecting member 123; the insulating member 122 covers at least a portion of the first end surface 1231, so that the insulating member 122 can cover at least a portion of the gap.

[0105] For example, the insulating member 122 can cover part of the first end face 1231, and the insulating member 122 also covers part of the gap, so that the contact area between the insulating member 122 and the first end face 1231 is increased, and the connection strength between the insulating member 122 and the connector 123 is improved; or, the insulating member 122 can cover part of the first end face 1231, and the insulating member 122 also completely covers the gap, that is, the insulating member 122 protrudes from the first end face 1231 and covers the open end of the inner cavity 1233 of the connector 123, the contact area between the insulating member 122 and the first end face 1231 is increased, and the connection strength between the insulating member 122 and the connector 123 can be improved. At the same time, the path required for the electrolyte in the shell 110 to leak from between the insulating member 122 and the connector 123 is longer, that is, the probability of electrolyte leakage is lower, which effectively improves the effect of preventing electrolyte leakage.

[0106] Please refer to Figures 4 and 6. In some embodiments, the insulating member 122 includes a first insulating portion 1221 and a second insulating portion 1222. The first insulating portion 1221 is disposed in the inner cavity 1233, and the second insulating portion 1222 protrudes outside the first end surface 1231. The second insulating portion 1222 abuts against the first end surface 1231 and covers the open end of the inner cavity 1233.

[0107] It can be understood that the first insulating portion 1221 and the second insulating portion 1222 are respectively partial structures of the insulating member 122 .

[0108] The first insulating part 1221 is arranged in the inner cavity 1233. It can be understood that the first insulating part 1221 is adapted to the inner cavity 1233; for example, when the inner cavity 1233 of the connector 123 is a columnar cavity, the first insulating part 1221 can be a corresponding columnar block, so that the columnar block can fill the inner cavity 1233 when it is arranged in the inner cavity 1233; or, when the inner cavity 1233 of the connector 123 is a spherical cavity, the first insulating part 1221 can be a corresponding spherical block, so that the spherical block can fill the inner cavity 1233 when it is arranged in the inner cavity 1233.

[0109] The second insulating portion 1222 protrudes beyond the first end face 1231. It can be understood that the second insulating portion 1222 can be, but is not limited to, a regular structure (such as a columnar structure, a spherical structure, a conical structure or a block structure, etc.) or an irregular structure, as long as the second insulating portion 1222 can cover the open end of the inner cavity 1233.

[0110] For example, in some specific embodiments, the inner cavity 1233 of the connecting member 123 is a cylindrical cavity, the first insulating part 1221 of the insulating member 122 corresponds to a columnar insulating block, the second insulating part 1222 of the insulating member 122 can also be a columnar insulating block, the second insulating part 1222 is coaxially arranged with the first insulating part 1221, and the diameter of the second insulating part 1222 is larger than the diameter of the first insulating part 1221; when the first insulating part 1221 is filled into the inner cavity 1233, the second insulating part 1222 can abut against the first end face 1231. At the same time, since the second insulating part 1222 is coaxially arranged with the first insulating part 1221, the second insulating part 1222 covers the port of the inner cavity 1233.

[0111] In this arrangement, the first insulating portion 1221 of the insulating member 122 is arranged in the inner cavity 1233 and connected to the connecting member 123, and the second insulating portion 1222 of the insulating member 122 abuts against the first end face 1231 and covers the port of the inner cavity 1233, thereby increasing the contact area between the insulating member 122 and the connecting member 123, effectively improving the effect of preventing electrolyte leakage between the insulating member 122 and the connecting member 123.

[0112] 4 and 6 , in some embodiments, the first end surface 1231 protrudes outward to form a first annular protrusion (not shown in the figures), and the inner sidewall of the first annular protrusion abuts against the outer sidewall of the second insulating portion 1222 .

[0113] The first annular protrusion is integrally formed on the first end surface 1231 of the connector 123 and can be disposed around the second insulating portion 1222 so that the second insulating portion 1222 is accommodated inside the first annular protrusion. Specifically, the first annular protrusion has an annular structure, which can be, but is not limited to, a circular ring structure, a polygonal ring structure, or an irregular ring structure.

[0114] It can be understood that when the first insulating part 1221 is filled in the inner cavity 1233 of the connector 123, the second insulating part 1222 can be filled in the first annular protrusion so that the outer wall of the second insulating part 1222 abuts against the inner wall of the first annular protrusion.

[0115] In this arrangement, the inner wall of the first annular protrusion of the first end face 1231 abuts against the outer wall of the second insulating portion 1222, so that the contact area between the insulating part 122 and the connecting part 123 will be increased, and the path required for the electrolyte in the shell 110 to leak from between the insulating part 122 and the connecting part 123 will be longer, that is, the probability of electrolyte leakage is lower, and the effect of the sealing assembly 120 in preventing electrolyte leakage is improved; at the same time, the increase in the contact area between the insulating part 122 and the connecting part 123 can also improve the connection strength between the insulating part 122 and the connecting part 123.

[0116] 3 , 4 and 6 , in some embodiments, the connector 123 has a second end surface 1232 , which is configured to face the inside of the housing 110 ; the insulating member 122 covers at least a portion of the second end surface 1232 .

[0117] It can be understood that the second end surface 1232 refers to an end surface of the connecting member 123 facing the inside of the housing 110 when the connecting member 123 is connected to the housing 110 .

[0118] When the insulating member 122 fills the inner cavity 1233 of the connecting member 123, an annular gap is formed between the insulating member 122 and the second end surface 1232 of the connecting member 123; the insulating member 122 covers at least a portion of the second end surface 1232, so that the insulating member 122 can cover at least a portion of the gap.

[0119] For example, the insulating member 122 can cover part of the second end face 1232, and the insulating member 122 also covers part of the gap, so that the contact area between the insulating member 122 and the second end face 1232 is increased, and the connection strength between the insulating member 122 and the connector 123 is improved; or, the insulating member 122 can cover part of the second end face 1232, and the insulating member 122 also completely covers the gap, that is, the insulating member 122 protrudes from the second end face 1232 and covers the open end of the inner cavity 1233 of the connector 123, the contact area between the insulating member 122 and the second end face 1232 is increased, and the connection strength between the insulating member 122 and the connector 123 can be improved. At the same time, the path required for the electrolyte in the shell 110 to leak from between the insulating member 122 and the connector 123 is longer, that is, the probability of electrolyte leakage is lower, which effectively improves the effect of preventing electrolyte leakage.

[0120] Please refer to Figures 4 and 6. In some embodiments, the insulating member 122 includes a first insulating portion 1221 and a third insulating portion 1223. The first insulating portion 1221 is disposed in the inner cavity 1233, and the third insulating portion 1223 protrudes outside the second end surface 1232. The third insulating portion 1223 abuts against the second end surface 1232 and covers the open end of the inner cavity 1233.

[0121] It can be understood that the first insulating portion 1221 and the third insulating portion 1223 are partial structures of the insulating member 122 respectively.

[0122] The first insulating part 1221 is arranged in the inner cavity 1233. It can be understood that the first insulating part 1221 is adapted to the inner cavity 1233; for example, when the inner cavity 1233 of the connector 123 is a columnar cavity, the first insulating part 1221 can be a corresponding columnar block, so that the columnar block can fill the inner cavity 1233 when it is arranged in the inner cavity 1233; or, when the inner cavity 1233 of the connector 123 is a spherical cavity, the first insulating part 1221 can be a corresponding spherical block, so that the spherical block can fill the inner cavity 1233 when it is arranged in the inner cavity 1233.

[0123] The third insulating portion 1223 protrudes outside the second end face 1232. It can be understood that the third insulating portion 1223 can be, but is not limited to, a regular structure (such as a columnar structure, a spherical structure, a conical structure or a block structure, etc.) or an irregular structure, as long as the third insulating portion 1223 can cover the open end of the inner cavity 1233.

[0124] In this arrangement, the first insulating portion 1221 of the insulating member 122 is arranged in the inner cavity 1233 and connected to the connecting member 123, and the third insulating portion 1223 of the insulating member 122 abuts against the second end face 1232 and covers the open end of the inner cavity 1233, thereby increasing the contact area between the insulating member 122 and the connecting member 123, effectively improving the effect of preventing electrolyte leakage between the insulating member 122 and the connecting member 123, and at the same time improving the connection strength between the insulating member 122 and the connecting member 123.

[0125] For example, in some specific embodiments, the inner cavity 1233 of the connecting member 123 is a cylindrical cavity, the first insulating portion 1221 of the insulating member 122 corresponds to a columnar insulating block, and the second insulating portion 1222 and the third insulating portion 1223 of the insulating member 122 can both be columnar insulating blocks; the second insulating portion 1222 and the third insulating portion 1223 are both coaxially arranged with the first insulating portion 1221, and the diameters of the second insulating portion 1222 and the third insulating portion 1223 are both larger than the diameter of the first insulating portion 1221; when the first insulating portion 1221 is 221 is filled into the inner cavity 1233, the second insulating part 1222 can abut against the first end face 1231 and the third insulating part 1223 can abut against the second end face 1232; at the same time, since the second insulating part 1222 and the third insulating part 1223 are both coaxially arranged with the first insulating part 1221, the second insulating part 1222 covers the opening end on one side of the inner cavity 1233, and the third insulating part 1223 covers the opening end on the other side of the inner cavity 1233, as shown in Figure 6, which effectively improves the sealing and anti-leakage effect of the sealing component 120.

[0126] 4 and 6 , in some embodiments, the second end surface 1232 protrudes outward to form a second annular protrusion 12321 , and the inner wall of the second annular protrusion 12321 abuts against the outer wall of the third insulating portion 1223 .

[0127] The second annular protrusion 12321 is integrally formed on the second end surface 1232 of the connector 123 and can be disposed around the third insulating portion 1223 so that the third insulating portion 1223 is accommodated inside the first annular protrusion. Specifically, the second annular protrusion 12321 has an annular structure, which can be, but is not limited to, a circular ring structure, a polygonal ring structure, or an irregular ring structure.

[0128] It can be understood that when the first insulating part 1221 is filled in the inner cavity 1233 of the connector 123, the third insulating part 1223 can be filled in the second annular protrusion 12321 so that the outer wall surface of the third insulating part 1223 abuts against the inner wall surface of the second annular protrusion 12321.

[0129] In this arrangement, the inner wall of the second annular protrusion 12321 of the second end face 1232 abuts against the outer wall of the third insulating part 1223, so that the contact area between the insulating part 122 and the connecting part 123 is increased again, further improving the effect of preventing electrolyte leakage between the insulating part 122 and the connecting part 123, and at the same time improving the connection strength between the insulating part 122 and the connecting part 123.

[0130] Please refer to Figures 2, 5 and 6. In some embodiments, the shell 110 also includes an insulating layer 112, which is arranged on the inner side of the shell 110. The insulating layer 112 is provided with an avoidance hole 1121; the third insulating portion 1223 and the second annular protrusion 12321 are both arranged in the avoidance hole 1121.

[0131] It is understood that the insulating layer 112 is used to separate the housing 110 from the battery cell assembly 23 inside the housing 110, thereby reducing the probability of leakage in the housing 110. Specifically, when the housing 110 is an end cap 21, the insulating layer 112 can be an insulating member 122 covering the inner side of the end cap 21, such as a lower plastic film layer; when the housing 110 is an outer shell 22, the insulating layer 112 can be an insulating membrane covering the inner side of the outer shell 22, such as a polyester film.

[0132] An avoidance hole 1121 is opened on the insulating layer 112 to accommodate the third insulating portion 1223 and the second annular protrusion 12321; specifically, the depth of the avoidance hole 1121 is the thickness of the insulating layer 112, and the avoidance hole 1121 can be, but is not limited to, a circular hole, a rectangular hole, a strip hole or an irregular hole shape.

[0133] The third insulating portion 1223 and the second annular protrusion 12321 are both arranged in the avoidance hole 1121, that is, the third insulating portion 1223 and the second annular protrusion 12321 are completely in the avoidance hole 1121, and the depth of the avoidance hole 1121 is greater than or equal to the height of the third insulating portion 1223 and the second annular protrusion 12321.

[0134] In this way, an avoidance hole 1121 is opened on the insulating layer 112, and the avoidance hole 1121 is used to accommodate the third insulating part 1223 and the second annular protrusion 12321, so as to prevent the third insulating part 1223 and the second annular protrusion 12321 from protruding out of the insulating layer 112, thereby reducing the influence of the third insulating part 1223 and the second annular protrusion 12321 on the internal components of the shell 110.

[0135] Referring to FIG. 3 to FIG. 6 , in some embodiments, the connector 123 has a connecting end surface 1234 , and the connecting end surface 1234 is configured to be sealed and connected to the hole wall of the through hole 111 .

[0136] It is understood that the connection end surface 1234 refers to the end surface of the connector 123 facing the wall of the through hole 111 when the sealing assembly 120 is plugged into the through hole 111. Specifically, the sealing assembly 120 can be inserted into the through hole 111 to achieve the plugging effect. In this case, the connector 123 is located within the through hole 111, and the peripheral side surface of the connector 123 in the thickness direction is the connection end surface 1234.

[0137] Among them, the connecting end face 1234 is sealed and connected with the hole wall of the through hole 111. The specific sealing connection method can be: a threaded structure is formed on the connecting end face 1234, and an internal thread is correspondingly formed on the hole wall of the through hole 111, and the connecting member 123 is selected into the through hole 111 so that the connecting end face 1234 is threadedly connected with the hole wall of the through hole 111 to form a seal; or, the connecting end face 1234 of the connecting member 123 can be fixed to the hole wall of the through hole 111 by welding to form a seal; or, the connecting member 123 can be interference fit with the through hole 111, so that the connecting end face 1234 of the connecting member 123 is tightly connected with the hole wall of the through hole 111 to form a seal.

[0138] With such a configuration, the connecting end surface 1234 and the hole wall of the through hole 111 are sealed and connected, so that the sealing performance of the sealing component 120 blocking the through hole 111 is better.

[0139] 3 and 5 , in some embodiments, the diameter of the through hole 111 tends to decrease along the axial direction of the through hole 111 and in the direction toward the inside of the housing 110 .

[0140] It can be understood that the aperture of the through hole 111 tends to decrease, which specifically means that: along the axial direction of the through hole 111 and in the direction toward the inside of the shell 110, the aperture of the through hole 111 shows a linear decreasing trend; or, along the axial direction of the through hole 111 and in the direction toward the inside of the shell 110, the aperture of the through hole 111 may show a nonlinear decreasing trend, for example, the aperture of the through hole 111 may first remain unchanged and then the aperture continues to decrease.

[0141] In this arrangement, the aperture of the through hole 111 tends to decrease in the axial direction and in the direction toward the inside of the shell 110, so that when the sealing assembly 120 is arranged at the through hole 111, the hole wall of the through hole 111 exerts a supporting force on the connecting piece 123 of the sealing assembly 120, so as to facilitate the positioning of the sealing assembly 120, thereby facilitating the connection operation between the connecting piece 123 of the sealing assembly 120 and the shell 110.

[0142] 3 to 6 , in some embodiments, the outer diameter of the connecting member 123 tends to decrease along the thickness direction of the connecting member 123 .

[0143] It can be understood that the outer diameter of the connecting member 123 tends to decrease, which specifically means that the outer diameter of the connecting member 123 shows a linear decreasing trend along the thickness direction of the connecting member 123; or, the outer diameter of the connecting member 123 can show a nonlinear decreasing trend along the thickness direction of the connecting member 123, for example, the outer diameter of the connecting member 123 can remain unchanged at first and then continue to decrease.

[0144] The outer shape of the connector 123 can match the shape of the through hole 111, that is, when the sealing assembly 120 is inserted into the through hole 111, the connecting end surface 1234 of the connector 123 abuts against the wall of the through hole 111. For example, in some specific embodiments, the shape of the through hole 111 can be truncated cone, that is, the wall of the through hole 111 is inclined, and the connecting end surface 1234 of the connector 123 is also inclined accordingly.

[0145] With such a configuration, when the sealing assembly 120 is sealed at the through hole 111, the connecting end face 1234 of the connector 123 is better adapted to the hole wall of the through hole 111, and thus the contact area between the connecting end face 1234 of the connector 123 and the hole wall of the through hole 111 is larger, thereby improving the sealing performance and connection strength between the connector 123 and the shell 110, thereby achieving the purpose of improving the leakage situation.

[0146] Please refer to FIG. 5 and FIG. 7 . In some embodiments, a pressure relief mechanism is provided on the end cover 21 , and the through hole 111 is located around the pressure relief mechanism.

[0147] It can be understood that in order to meet the structural strength required for setting up the pressure relief mechanism, the thickness of the end cover 21 near the pressure relief mechanism is thicker than the thickness of the end cover 21 away from the pressure relief mechanism; therefore, when the through hole 111 is opened at the end cover on the peripheral side of the pressure relief mechanism, since the structural strength of the end cover here is stronger, opening the through hole 111 on the end cover here can reduce the probability of damage to the end cover.

[0148] Specifically, the end cap is further provided with a positive electrode post 2111 and a negative electrode post 2112. The circumference of the pressure relief mechanism refers to the set of all areas on the end cap 21 where the distance between the positive electrode post 2111 or the negative electrode post 2112 is greater than the distance between the pressure relief mechanism. The aforementioned distances refer to the distance between any point on the outward-facing surface of the end cap 21 and the center point of the plane where the pressure relief mechanism and the end cap 21 intersect, as well as the distance between any point on the outward-facing surface of the end cap 21 and the center point of the plane where the positive electrode post 2111 or the negative electrode post 2112 intersects the end cap 21.

[0149] Please refer to Figures 3 and 6. In some embodiments, the first contact portion 1211 is configured to be disposed on the outside of the shell 110. The sealing assembly 120 also includes an insulating sleeve (not shown in the figures), which is configured to be able to be sleeved on the first contact portion 1211.

[0150] It can be understood that when the first contact portion 1211 is arranged on the outside of the shell 110, the second contact portion 1212 is correspondingly arranged on the inside of the shell 110; the first contact portion 1211 is used to be electrically connected to an external power supply, and the second contact portion 1212 is used to be electrically connected to the power line of the heating device inside the shell 110.

[0151] The insulating sleeve is used to fit over the first contact portion 1211 to provide insulation and protection for the first contact portion 1211. Specifically, the insulating sleeve can be a flexible bag-like structure that is fitted over the first contact portion 1211; alternatively, the insulating sleeve can be a rigid block structure with a protective groove defined in the block structure, into which the first contact portion 1211 is inserted, so that the block structure provides a protective covering for the first contact portion 1211; alternatively, the insulating sleeve can be a flexible sheet structure that can be fitted over the first contact portion 1211 to provide a protective covering for the first contact portion 1211. The insulating sleeve can be, but is not limited to, a rubber sleeve, a polyester film sleeve, a plastic sleeve, or the like.

[0152] Specifically, the conductive part 121 may include two conductors arranged at intervals, and the first contact portion 1211 includes parts of the two conductors exposed to the insulating part 122 on the outside of the shell 110; therefore, the insulating sleeve may include a sleeve structure, which simultaneously protects the exposed parts of the two conductors; or, the insulating sleeve may also include two sleeve structures, which are respectively sleeved on the exposed parts of the two conductors.

[0153] With such a configuration, when the first contact portion 1211 does not need to be connected to an external power supply, the insulating sleeve can be placed on the first contact portion 1211 to reduce the risk of accidental contact between the first contact portion 1211 and charged bodies such as the poles of the battery cell 20; and when the first contact portion 1211 needs to be connected to an external power supply, the insulating sleeve can be removed from the first contact portion 1211.

[0154] For example, in some specific embodiments, the shell 110 includes an end cover 21, and a through hole 111 is opened on the end cover 21 along the thickness direction of the end cover 21, and the through hole 111 is a circular through hole 111; the connecting piece 123 of the sealing assembly 120 is an annular aluminum pressing sheet, and the insulating piece 122 is an injection molded piece, and the injection molded piece includes a first cylindrical block, a second cylindrical block and a third cylindrical block arranged in sequence along the thickness direction, and the diameters of the first cylindrical block and the third cylindrical block are greater than the diameter of the second cylindrical block; the conductive piece 121 includes two conductive columns, and the two conductive columns are passed through the injection molded piece along the thickness direction; the second cylindrical block of the injection molded piece is used to fill the hollow inner cavity 1233 of the aluminum pressing sheet, so that the second cylindrical block fills the inner cavity 1233, and at the same time, the first cylindrical block fills the inner cavity 1233. A cylindrical block covers one open end of the inner cavity 1233 and abuts against one side surface of the aluminum pressing sheet, and a third cylindrical block covers the other open end of the inner cavity 1233 and abuts against the other side surface of the aluminum pressing sheet, so that the injection molded part and the aluminum pressing sheet can be tightly connected, and the sealing between the injection molded part and the aluminum pressing sheet is better; the sealing component 120 is set in the through hole 111, and the outer wall of the peripheral side of the aluminum pressing sheet abuts against the hole wall of the through hole 111, and then the aluminum pressing sheet and the end cover are welded and fixed by welding, so that the sealing component 120 can seal the through hole 111, and one end of the two conductive columns extends into the shell 110 for electrical connection to the heating device inside the shell 110, and the other end of the two conductive columns extends outside the shell 110 for electrical connection to the external power supply.

[0155] Please refer to Figures 2 to 5 and Figure 7. In the second aspect, the embodiment of the present application also provides a battery cell 20, which includes a battery cell assembly 23, a heating device, and a shell assembly 100 as described above. The battery cell assembly 23 is arranged on the inner side of the shell 110 of the shell assembly 100, the heating device is arranged on the battery cell assembly 23, the second contact portion 1212 is configured to be arranged on the inner side of the shell 110, and the heating device is electrically connected to the second contact portion 1212.

[0156] The heating device is used to release heat when powered on to heat the battery cell assembly 23. Specifically, the heating device can be, but is not limited to, a heating film, a heating wire, or other structures.

[0157] The battery cell 20 provided in the embodiment of the present application includes the above-mentioned housing assembly 100 . On the basis that the housing assembly 100 has better sealing performance and a lower probability of electrolyte leakage, the battery cell 20 is less likely to leak electrolyte.

[0158] As shown in Figure 1, in a third aspect, an embodiment of the present application further provides a battery 1100, which includes at least the aforementioned battery cell 20. The battery 1100 employs any of the battery cells 20 described in the aforementioned embodiments, which will not be described in detail herein.

[0159] Fourthly, the present application also provides an electrical device, which includes at least the battery 1100 described above. The electrical device can be any of the electrical devices described in the above embodiments, such as a heat spreading system, which will not be described in detail here.

[0160] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A housing assembly, applied to a battery cell, characterized in that: include: A housing, wherein a through hole is formed in the housing; and A sealing component, the sealing component is configured to seal the through hole, the sealing component includes a conductive member, an insulating member and a connecting member; The insulating member is covered on the conductive member, and the conductive member has a first contact portion and a second contact portion respectively exposed on the insulating member; The connector is formed with a hollow inner cavity, the insulating member is filled in the inner cavity, the connector is configured to be connected to the shell, and the first contact portion and the second contact portion are respectively located on the inner side and the outer side of the shell.

2. The housing assembly according to claim 1, characterized in that: The shell includes an end cover, and the through hole is opened on the end cover.

3. The housing assembly according to claim 1 or 2, characterized in that: The thickness of the insulating member is greater than the thickness of the connecting member.

4. The housing assembly according to claim 3, characterized in that: The connecting member has a first end surface, and the first end surface is configured to face the outside of the shell; the insulating member covers at least a portion of the first end surface.

5. The housing assembly according to claim 4, characterized in that: The insulating member includes a first insulating portion and a second insulating portion, wherein the first insulating portion is disposed in the inner cavity, the second insulating portion protrudes out of the first end surface, and the second insulating portion abuts against the first end surface and covers the opening end of the inner cavity.

6. The housing assembly according to claim 5, characterized in that: The first end surface protrudes outward to form a first annular protrusion, and the inner wall surface of the first annular protrusion abuts against the outer wall surface of the second insulating portion.

7. The housing assembly according to claim 3, characterized in that: The connecting member has a second end surface, and the second end surface is configured to face the inside of the shell; the insulating member covers at least a portion of the second end surface.

8. The housing assembly according to claim 7, characterized in that: The insulating member includes a first insulating portion and a third insulating portion, wherein the first insulating portion is disposed in the inner cavity, the third insulating portion protrudes out of the second end surface, and the third insulating portion abuts against the second end surface and covers the opening end of the inner cavity.

9. The housing assembly according to claim 8, characterized in that: The second end surface protrudes outward to form a second annular protrusion, and the inner wall surface of the second annular protrusion abuts against the outer wall surface of the third insulating portion.

10. The housing assembly according to claim 9, characterized in that: The shell further comprises an insulating layer, which is arranged on the inner side surface of the shell and has an escape hole formed thereon; the third insulating portion and the second annular protrusion are both arranged in the escape hole.

11. The housing assembly according to claim 1, characterized in that: The connecting member has a connecting end surface, and the connecting end surface is configured to be sealingly connected to the hole wall of the through hole.

12. The housing assembly according to claim 11, characterized in that: The hole diameter of the through hole tends to decrease in a direction along the axial direction of the through hole and toward the inside of the housing.

13. The housing assembly according to claim 12, characterized in that: The outer diameter of the connecting member tends to decrease in the thickness direction of the connecting member.

14. The housing assembly according to claim 2, wherein: The end cover is provided with a pressure relief mechanism, and the through hole is located on the peripheral side of the pressure relief mechanism.

15. The housing assembly according to claim 1, characterized in that: The first contact portion is configured to be disposed outside the housing, and the sealing assembly further includes an insulating sleeve, which is configured to be sleeved on the first contact portion.

16. A battery cell, characterized in that: The battery cell includes a cell assembly, a heating device, and a shell assembly as described in any one of claims 1 to 15, wherein the cell assembly is arranged on the inner side of a shell of the shell assembly, the heating device is arranged on the cell assembly, the second contact portion is configured to be arranged on the inner side of the shell, and the heating device is electrically connected to the second contact portion.

17. A battery, characterized in that: The battery comprises at least the battery cell as claimed in claim 16.

18. An electrical equipment, characterized in that: The electrical device at least comprises the battery as claimed in claim 17.

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