Casing components, battery cells, batteries and electrical devices

Abstract

This invention relates to a housing assembly, including a housing, terminals, and a seal. By arching and bending the housing itself to form a flange, the terminals are pressed against the end wall of the housing, thus eliminating the need for an upper plastic component to fix the terminals to the housing. Furthermore, the annular protrusion formed by the arching of the end wall has a double-layer structure, and the flange formed by the bending also has a double-layer structure, so the flange is less likely to rebound after pressing the terminals, resulting in better terminal fixation. In addition, the connection strength between the terminals and the housing is positively correlated with the radial dimensions of the flange and the protrusion, and is not affected by the height of the terminals, thus the height of the terminals can be significantly reduced. Furthermore, since the terminals do not need to extend into the housing, they do not occupy internal space. Therefore, the above-mentioned housing assembly has a high space utilization rate in the height direction, thereby improving energy density. In addition, this invention also provides a battery cell, a battery, and a power supply device.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and in particular to a housing assembly, a battery cell, a battery, and an electrical device. Background Technology

[0002] In cylindrical batteries, the terminals, like the positive terminal, are installed within terminal holes on the bottom wall of the casing. The terminals pass through these holes, and an upper plastic component is injection-molded between the terminal and the bottom wall. The terminal is then fixedly connected to the casing via this upper plastic component. To increase the contact area between the terminal and the upper plastic component, thereby improving the strength of the connection, the terminals are typically designed in an I-shape, which increases their height. Furthermore, the terminals extending into the casing also occupy internal space. Thus, cylindrical batteries have limited space utilization in the vertical direction, i.e., the axial direction of the casing, resulting in a lower energy density. Summary of the Invention

[0003] Therefore, it is necessary to provide a casing assembly, battery cell, battery, and power device that can improve energy density in response to the above problems.

[0004] On one hand, this application provides a housing assembly, including:

[0005] The housing has an end wall with a pole post hole at one end, and the annular area of ​​the end wall extending circumferentially along the pole post hole arches outward to form an annular protrusion.

[0006] An electrode post includes a main body and a flange extending radially from the periphery of one end of the main body. The electrode post is disposed within a region enclosed by an annular protrusion and covers an electrode post hole. The annular protrusion bends toward the electrode post hole and forms a flange that presses the flange against the end wall.

[0007] A sealing element that can form a seal between the pole and the housing.

[0008] In one embodiment, the region of the end wall located inside the annular protrusion is recessed into the housing to form an annular step supporting the pole post, and there is a height difference between the inner surface of the annular step and the inner surface of the region of the end wall located outside the annular protrusion.

[0009] In one embodiment, the height difference between the inner surface of the annular step and the inner surface of the region of the end wall located outside the annular protrusion is greater than or equal to 0.2 mm and less than or equal to 1.5 mm.

[0010] In one embodiment, the flange comprises two overlapping annular walls, which are welded together by a welding section.

[0011] In one embodiment, a metal sheet is held between the two annular walls, and the weld extends through the metal sheet.

[0012] In one embodiment, the seal includes a first sealing section and two second sealing sections, the two second sealing sections being respectively sandwiched between the flange portion and the flange and the end wall, the first sealing section covering the periphery of the flange portion and connected to the two second sealing sections.

[0013] In one embodiment, the orthographic projection of the welded portion onto the flange portion is located on the side of the first sealing section facing the pole hole, and is spaced apart from the first sealing section.

[0014] In one embodiment, a first insulating pad is also included, the first insulating pad including a first body segment and a first extension segment extending from one end of the first body segment, the first body segment being located between the flange and the flange, and the first extension segment extending to the space between the body segment and the flange.

[0015] In one embodiment, gaps are formed between both sides of the first extension and the main body and the flange.

[0016] In one embodiment, a second insulating pad is also included, the second insulating pad including a second main body segment and a second extension segment extending from one end of the second main body segment, the second main body segment being located between the flange and the end wall, and the second extension segment extending into the pole hole.

[0017] In one embodiment, a gap is formed between the second extension and the inner wall of the pole hole.

[0018] In one embodiment, an insulating heat sink is also included, which fills the gap between the main body and the flange.

[0019] Compared with the prior art, this application has at least the following beneficial effects:

[0020] The aforementioned housing assembly uses an arched and bent structure to form a flange, thereby pressing the electrode post against the end wall of the housing. This eliminates the need for an upper plastic component to secure the electrode post to the housing. Furthermore, the annular protrusion formed by the arched end wall and the flange formed by the bending are both double-layered, preventing the flange from easily rebounding after pressing the electrode post, resulting in excellent electrode post fixation. In addition, the connection strength between the electrode post and the housing is positively correlated with the radial dimensions of the flange and the protrusion, and is unaffected by the height of the electrode post, thus significantly reducing the electrode post height. Moreover, since the electrode post does not need to extend into the housing, it does not occupy internal space. Therefore, the aforementioned housing assembly has high space utilization in the height direction, thereby improving energy density.

[0021] On the other hand, this application provides a battery cell including a housing assembly, a battery cell, and a current collector as described in any of the preferred embodiments above. The battery cell and the current collector are housed within the housing, and the tab at one end of the battery cell is electrically connected to the terminal post through the current collector.

[0022] This application also provides a battery comprising a plurality of battery cells as described in the preferred embodiments above.

[0023] In addition, this application provides an electrical device, including a battery cell as described in the above preferred embodiment or a battery as described in the above preferred embodiment. Attached Figure Description

[0024] 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the housing assembly in one embodiment of the present invention;

[0026] Figure 2 for Figure 1 Exploded view of the housing assembly shown;

[0027] Figure 3 for Figure 1 A cross-sectional view of the housing assembly shown;

[0028] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the housing assembly shown;

[0029] Figure 5 for Figure 1 The diagram shows the structural schematic of the outer casing assembly in its intermediate state.

[0030] Figure 6 for Figure 5 The cross-sectional view of the housing assembly in its intermediate state is shown. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] This invention discloses an electrical device, a battery, and a battery cell. The electrical device includes the battery or the battery cell and is capable of providing electrical energy. The electrical device can be a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, power tool, energy storage device, amusement equipment, elevator, and lifting equipment, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, drop towers, etc. This application does not impose any special restrictions on the aforementioned electrical devices.

[0038] For new energy vehicles, the aforementioned batteries can serve as a driving power source, thereby replacing fossil fuels to provide driving power.

[0039] The aforementioned battery can be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells. Multiple battery cells can be electrically connected in series, parallel, or a combination of series and parallel connections, and communicate with the battery management system to form a battery pack. The battery management system controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be connected in series and / or parallel, and then connected with a module management system to form a battery module. These battery modules can then be electrically connected in series, parallel, or a combination of series and parallel connections, and together with the battery management system, form a battery pack.

[0040] In this battery pack or module, multiple battery cells can be mounted on supporting structures such as housings, frames, or brackets. The individual battery cells and the battery management system can be electrically connected via busbars, such as relays. The battery cells can be lithium-ion, sodium-ion, or magnesium-ion batteries. Specifically, in this embodiment, the battery cell is a lithium-ion cylindrical battery.

[0041] Please see Figure 1 The present invention also provides a housing assembly 100. The aforementioned battery cell includes the housing assembly 100, a battery cell (not shown), and a current collector (not shown).

[0042] The battery cell is the core component of a single battery cell and is housed within the casing assembly 100. A battery cell is generally formed by winding a positive electrode, a negative electrode, and a separator that insulates between the positive and negative electrodes. Specifically, in this embodiment, the battery cell is cylindrical, with a positive tab and a negative tab at each end. Typically, the positive tab is electrically connected to the terminal post 120 of the casing assembly 100 via a positive current collector, and the negative tab is electrically connected to the housing 110 of the casing assembly 100 via a negative current collector. Therefore, the terminal post 120 and the housing 110 serve as the positive and negative terminals of the single battery cell, respectively.

[0043] Please refer to the following: Figure 2 In one embodiment of the present invention, the housing assembly 100 includes a housing 110, a pole post 120, and a seal 130.

[0044] The housing 110 has a cylindrical structure, specifically a cylindrical shape. The housing 110 can be made of aluminum or steel, preferably steel for higher structural strength. One end of the housing 110 has a terminal hole 101, and the other end typically has an opening (not shown) for inserting the battery cell and current collector. After the battery cell assembly is complete, the opening can be sealed by a cover plate (not shown). Furthermore, the annular region extending circumferentially from the terminal hole 101 on the end wall of the housing 110 arches outward to form an annular protrusion 111 (see figure). Figure 5 and Figure 6The housing 110 can be formed by stamping to obtain an integrally formed annular protrusion 111. Moreover, the annular protrusion 111 has a double-layer structure, and its radial cross-section is approximately inverted U-shaped.

[0045] The pole post 120 includes a main body 121 and a flange 122, the flange 122 extending radially from the periphery of one end of the main body 121. The main body 121 may be cylindrical, and the flange 122 may be disc-shaped, with the outer diameter of the flange 122 being larger than the outer diameter of the main body 121. Therefore, the pole post 120 is generally inverted T-shaped.

[0046] Please refer to the following: Figure 3 and Figure 4 During the assembly of the housing assembly 100, the pole post 120 is disposed within the area enclosed by the annular protrusion 111 and covers the pole post hole 101. The flange portion 122 of the pole post 120 faces the interior of the housing 110 and abuts against the edge of the pole post hole 101, i.e., the area where the end wall of the housing 110 is located inside the annular protrusion 111. Further, the annular protrusion 111 is bent toward the pole post hole 101 to form a flange 112, which presses the flange portion 122 against the end wall. The flange 112 is also annular and extends circumferentially along the pole post hole 101. The flange 112 is formed by bending the annular protrusion 111, i.e., the flange 112 is another form of the annular protrusion 111. In the assembled housing assembly 100, the annular protrusion 111 is not present. Moreover, since the annular protrusion 111 has a double-layer structure, the flange 112 formed by bending is also a double-layer structure.

[0047] The flange 122 is clamped between the flange 112 and the end wall of the housing 110, thereby fixing the terminal 120 to the housing 110. That is, the terminal 120 can be fixed to the housing 110 without the aid of the upper plastic component. The upper plastic component is bulky; eliminating it saves space in the height direction and reduces the number of components, thus simplifying the battery cell structure. Furthermore, the upper plastic component is susceptible to deformation due to secondary crystallization and electrolyte corrosion, which reduces the connection strength between the terminal 120 and the housing 110. The flange 112, however, is not affected by these factors, and the double-layered flange 112 is less prone to rebound after pressing down on the terminal 120, providing better fixation for the terminal 120.

[0048] Compared to the traditional I-shaped pole post, the T-shaped pole post 120 in this application has a lower height. Furthermore, the connection strength between the pole post 120 and the housing 110 is related to the radial dimensions of the flange 122 and the step flange 112, and is not affected by the height of the pole post 120. The larger the radial dimensions of the flange 122 and the step flange 112, the larger the contact area between them, resulting in a better clamping and fixing effect on the flange 122. Therefore, to ensure connection strength, it is only necessary to ensure a larger radial dimension of the pole post 120, and the height of the pole post 120 can be significantly reduced.

[0049] Furthermore, since the terminal post 120 does not need to extend into the housing 110, it does not occupy space inside the housing 110. Therefore, the aforementioned housing assembly 100 has a high space utilization rate in the height direction, thereby significantly improving the energy density of the battery cell.

[0050] Please refer to it again. Figure 2 and Figure 4 In this embodiment, the area of ​​the end wall of the housing 110 located inside the annular protrusion 111 sinks into the housing 110 to form an annular step 113 supporting the pole post 120. There is a height difference between the inner surface of the annular step 113 and the inner surface of the area of ​​the end wall located outside the annular protrusion 111.

[0051] The aforementioned inner surface refers to the surface facing the interior of the housing 110. Due to the aforementioned height difference, when the inner surface of the annular step 113 abuts against the current collector, a gap will be formed between the inner surface of the area of ​​the housing 110 located outside the annular protrusion 111 and the current collector or battery cell. This gap can be used to install a lower insulating member (not shown), thereby effectively isolating the housing 110 from the battery cell. Moreover, by providing the annular step 113, the electrode post 120 can also be recessed into the housing 110 during assembly, thereby making reasonable use of the space occupied by the lower insulating member in the height direction, which helps to further improve the space utilization rate in the height direction.

[0052] Furthermore, in this embodiment, the height difference between the inner surface of the annular step 113 and the inner surface of the region of the end wall located outside the annular protrusion 111 is greater than or equal to 0.2 mm and less than or equal to 1.5 mm. If the height difference is less than 0.2 mm, the gap formed between the inner surface of the housing 110 and the current collector or battery cell will be too small, resulting in a lower insulating component with a too low thickness that cannot provide adequate insulation. If the height difference is greater than 1.5 mm, it will result in wasted space in the height direction.

[0053] The seal 130 forms a seal between the terminal 120 and the housing 110. Therefore, leakage between the terminal 120 and the housing 110 can be prevented. Furthermore, the seal 130 generally also serves as insulation to prevent short circuits caused by conductive contact between the terminal 120 and the housing 110. Alternatively, insulation can be achieved between the terminal 120 and the housing 110 by applying an insulating layer.

[0054] In this embodiment, the sealing element 130 includes a first sealing section 131 and two second sealing sections 132. The two second sealing sections 132 are respectively sandwiched between the flange portion 122, the flange 112 and the end wall. The first sealing section 131 covers the periphery of the flange portion 122 and is connected to the two second sealing sections 132.

[0055] Specifically, the first sealing section 131 and the second sealing section 132 can be integrally molded from materials such as rubber and silicone. One second sealing section 132 is sandwiched between the outer surface of the flange 122 and the flange 112, and the other second sealing section 132 is sandwiched between the inner surface of the flange 122 and the end wall, specifically between the recessed step 113. The sealing element 130 is generally annular and extends circumferentially along the flange 122. Moreover, the two second sealing sections 132 are respectively connected to both ends of the first sealing section 131, making the radial cross-section of the sealing element 130 approximately U-shaped. The cooperation of the first sealing section 131 and the second sealing section 132 can significantly extend the sealing path between the pole post 120 and the housing 110, thereby improving the sealing and insulation effect.

[0056] Furthermore, in this embodiment, the flange 112 includes two overlapping annular walls 1121, and the two annular walls 1121 are welded together by a welding part (not shown in the figure).

[0057] Specifically, laser penetration welding or other methods can be used to weld the two annular walls 1121 into one piece, thereby increasing the structural strength of the flange 112 and further improving the fixing effect on the terminal post 120. When the battery cell experiences thermal runaway and causes the internal pressure of the casing 110 to increase, it can be ensured that the terminal post 120 will not be pushed out due to the rebound of the flange 112, thus avoiding damage to the entire battery module and battery pack.

[0058] Furthermore, in this embodiment, the orthographic projection of the welded portion on the flange portion 122 is located on the side of the first sealing section 131 facing the pole post hole 101, and is spaced apart from the first sealing section 131. That is, there is a gap between the welded portion and the first sealing section 131 along the radial direction of the pole post 120. In this way, when laser welding the two annular walls 1121, the impact of the welding process on the first sealing section 131 can be effectively reduced, and damage to the first sealing section 131 can be avoided. Since the first sealing section 131 plays the main sealing role, it can be ensured that the sealing effect of the sealing element 130 is not affected by welding.

[0059] Furthermore, in this embodiment, a metal sheet 140 is sandwiched between the two annular walls 1121, and the welded portion penetrates the metal sheet 140. There may be gaps between the two annular walls 1121 of the flange 112, which could lead to risks such as spalling and cracking during laser penetration welding. The metal sheet 140 is generally made of the same material as the housing 110 and can fill the gaps between the two annular walls 1121, thereby ensuring a uniform and reliable welded portion. Specifically, the metal sheet 140 can be inserted from the inside of the annular protrusion 111 before bending it, and then bent together with the annular protrusion 111.

[0060] Please refer to it again. Figure 2 and Figure 4In this embodiment, the housing assembly 100 further includes a first insulating pad 150. The first insulating pad 150 includes a first main body segment 151 and a first extension segment 152 that extends from one end of the first main body segment 151. The first main body segment 151 is located between the flange portion 122 and the flange 112, and the first extension segment 152 extends to the space between the main body portion 121 and the flange 112.

[0061] Specifically, the first insulating gasket 150 can be made of ceramic, PET, or other insulating materials. The first insulating gasket 150 further enhances the insulation performance between the housing 110 and the pole post 120. Furthermore, since the first main body section 151 is located on the side of the seal 130 facing away from the flange 122, it also forms a shield between the flange 112 and the seal 130. Thus, the first insulating gasket 150 can also prevent damage to the second sealing section 132 from the laser beam or high-temperature substances during laser welding of the two annular walls 1121 of the flange 112.

[0062] Furthermore, in this embodiment, gaps are formed between both sides of the first extension 152 and the main body 121 and the flange 112. Therefore, the first insulating pad 150 will not obstruct the areas on both sides, and facilitates visual recognition and positioning of the equipment when the annular protrusion 111 is cut to press the pole post 120 or when the flange 112 is welded.

[0063] In this embodiment, the housing assembly 100 further includes a second insulating gasket 160, which includes a second main body segment 161 and a second extension segment 162 extending from one end of the second main body segment 161. The second main body segment 161 is located between the flange portion 122 and the end wall, and the second extension segment 162 extends into the pole hole 101.

[0064] The second insulating gasket 160 can be made of the same material as the first insulating gasket 150, and the second insulating gasket 160 can further improve the insulation performance between the housing 110 and the pole post 120. Moreover, when the current collector extends into the pole post hole 101 and is welded to the pole post 120, the second extension 162 can also play an insulating role between the current collector and the inner wall of the pole post hole 101.

[0065] Specifically, in this embodiment, a gap is formed between the second extension 162 and the inner wall of the pole hole 101. When the collector plate is inserted into the pole hole 101 and abuts against the lower surface of the flange 122, this gap can help to keep the collector plate away from the end wall of the housing 110.

[0066] In addition, in this embodiment, the housing assembly 100 also includes an insulating heat sink 170, which fills the gap between the main body 121 and the flange 112.

[0067] The electrode post 120, as the electrode output terminal, typically generates significant heat. The insulating heat sink 170, which contacts both the electrode post 120 and the housing 110, can quickly transfer heat from the electrode post 120 to the housing 110 and dissipate it through the housing 110, thus preventing overheating of the electrode post 120. The insulating heat sink 170 can also be molded from a phase change material, such as silicone grease, allowing for rapid heat dissipation through state switching. Furthermore, utilizing this property of phase change materials, the welding temperature can be used to melt the phase change material during the welding of the double-layered annular wall 1121, allowing it to better penetrate the gaps. After re-curing, the resulting insulating heat sink 170 can better fit the shape of the gap between the main body 121 and the flange 112.

[0068] The aforementioned housing assembly 100 presses the electrode post 120 against the end wall of the housing 110 by arching and bending the housing 110 itself to form a flange 112. Therefore, the electrode post 120 can be fixed to the housing 110 without the need for an upper plastic component. Furthermore, the annular protrusion 111 formed by the arching of the end wall has a double-layer structure, and the flange 112 formed by the bending also has a double-layer structure. Therefore, the flange 112 is less likely to rebound after pressing down on the electrode post 120, resulting in better fixation of the electrode post 120. In addition, the connection strength between the electrode post 120 and the housing 110 is positively correlated with the radial dimensions of the flange 122 and the flange 112, and is not affected by the height of the electrode post 120. Therefore, the height of the electrode post 120 can be significantly reduced. Furthermore, since the electrode post 120 does not need to extend into the housing 110, it does not occupy internal space. Therefore, the aforementioned housing assembly 100 has a high space utilization rate in the height direction, thereby improving energy density.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A housing assembly, characterized in that, include: The housing has an end wall with a pole post hole at one end, and the annular area of ​​the end wall extending circumferentially along the pole post hole arches outward to form an annular protrusion. An electrode post includes a main body and a flange extending radially from the periphery of one end of the main body. The electrode post is disposed within an area enclosed by an annular protrusion and covers an electrode post hole. The annular protrusion bends toward the electrode post hole and forms a flange that presses the flange against the end wall. The flange includes two overlapping annular walls, which are welded together by a welding portion. A sealing element that can form a seal between the pole and the housing.

2. The housing assembly according to claim 1, characterized in that, The region of the end wall located inside the annular protrusion sinks into the housing to form an annular step that supports the pole post. There is a height difference between the inner surface of the annular step and the inner surface of the region of the end wall located outside the annular protrusion.

3. The housing assembly according to claim 2, characterized in that, The height difference between the inner surface of the annular step and the inner surface of the end wall located outside the annular protrusion is greater than or equal to 0.2 mm and less than or equal to 1.5 mm.

4. The housing assembly according to claim 1, characterized in that, A metal sheet is held between the two annular walls, and the welded portion penetrates the metal sheet.

5. The housing assembly according to claim 1, characterized in that, The sealing element includes a first sealing section and two second sealing sections. The two second sealing sections are respectively sandwiched between the flange portion, the flange, and the end wall. The first sealing section covers the periphery of the flange portion and is connected to the two second sealing sections.

6. The housing assembly according to claim 5, characterized in that, The orthographic projection of the welded portion on the flange portion is located on the side of the first sealing section facing the pole hole, and is spaced apart from the first sealing section.

7. The housing assembly according to claim 1, characterized in that, It also includes a first insulating pad, the first insulating pad including a first main body segment and a first extension segment extending from one end of the first main body segment, the first main body segment being located between the flange and the flange, and the first extension segment extending to the space between the main body and the flange.

8. The housing assembly according to claim 7, characterized in that, Gaps are formed between the two sides of the first extension section and the main body and the flange.

9. The housing assembly according to claim 1, characterized in that, It also includes a second insulating pad, which includes a second main body segment and a second extension segment extending from one end of the second main body segment. The second main body segment is located between the flange and the end wall, and the second extension segment extends into the pole hole.

10. The housing assembly according to claim 9, characterized in that, A gap is formed between the second extension section and the inner wall of the pole hole.

11. The housing assembly according to claim 10, characterized in that, It also includes an insulating heat sink, which fills the gap between the main body and the flange.

12. A single battery cell, characterized in that, The device includes a housing assembly, a battery cell, and a current collector as described in any one of claims 1 to 11, wherein the battery cell and the current collector are housed within the housing, and the tab at one end of the battery cell is electrically connected to the terminal post via the current collector.

13. A battery, characterized in that, It includes multiple battery cells as described in claim 12 above.

14. An electrical appliance, characterized in that, Includes the battery cell as described in claim 12 or the battery as described in claim 13.

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