Shell assembly, battery monomer, battery and electric device

Abstract

The invention relates to a shell assembly. The shell assembly comprises a shell, a pole and a sealing piece, the shell is arched and bent to form the turnup, so that the pole is pressed on the end wall of the shell, and the pole can be fixed on the shell without the aid of an upper plastic part. And moreover, the annular bulge formed by arching the end wall is of a double-layer structure, and the turnup formed by bending is also of a double-layer structure, so that the turnup is not easy to rebound after pressing the pole, and the fixing effect on the pole is better. Besides, the connection strength of the pole and the shell is in positive correlation with the radial sizes of the flange part and the turnup and is not influenced by the height of the pole, so that the height of the pole can be obviously shortened. Furthermore, the pole does not need to extend into the shell, so that the pole does not occupy the internal space of the shell. Therefore, the space utilization rate of the shell assembly in the height direction is high, and the energy density can be improved. In addition, the invention also provides a battery monomer, a battery and an electric device.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a housing component, a battery cell, a battery and an electrical device. Background Art

[0002] The pole of a cylindrical battery, such as the positive pole, is generally installed in the pole hole of the bottom wall of the shell. The pole is inserted into the pole hole, and an upper plastic part is injection molded between the bottom wall and the pole. The pole is fixedly connected to the shell through the upper plastic part. In order to increase the contact area between the pole and the upper plastic part and thus enhance the strength of the fixed connection, the pole is generally designed to be an I-shaped pole, which will increase the height of the pole. Moreover, the pole extending into the shell will also occupy the space inside the shell. As a result, the cylindrical battery has limited utilization of the space in the height direction, that is, the axial direction of the shell, resulting in a low energy density. Summary of the invention

[0003] Based on this, it is necessary to provide a housing assembly, a battery cell, a battery and an electrical device that can improve the energy density in order to address the above problems.

[0004] In one aspect, the present application provides a housing assembly, comprising:

[0005] A shell, wherein an end wall at one end of the shell is provided with a pole hole, and an annular area of ​​the end wall extending circumferentially along the pole hole is arched outward to form an annular protrusion;

[0006] A pole, comprising a main body and a flange extending from the periphery of one end of the main body in the radial direction of the main body, the pole is arranged in the area surrounded by the annular protrusion and covers the pole hole, the annular protrusion is bent toward the pole hole and forms a flange for pressing the flange against the end wall; and

[0007] A sealing member is capable of forming a seal between the pole and the housing.

[0008] In one embodiment, the area of ​​the end wall located inside the annular protrusion sinks into the shell to form an annular step supporting the pole, and there is a height difference between the inner surface of the annular step and the inner surface of the area 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 end wall in the area 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 includes two layers of annular walls stacked on each other, and the two annular walls are welded through a welding portion.

[0011] In one embodiment, a metal sheet is sandwiched between the two annular walls, and the welding portion passes through the metal sheet.

[0012] In one embodiment, the seal includes a first sealing segment and two second sealing segments, the two second sealing segments are respectively clamped between the flange portion and the flange and the end wall, and the first sealing segment covers the periphery of the flange portion and is connected to the two second sealing segments.

[0013] In one embodiment, the orthographic projection of the welding portion on the flange portion is located on a 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 gasket is further included, which includes a first main body section and a first extension section bent and extended from one end of the first main body section, the first main body section is located between the flange portion and the flange, and the first extension section extends between the main body portion and the flange.

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

[0016] In one embodiment, a second insulating gasket is further included, the second insulating gasket includes a second main body section and a second extension section bent and extended from one end of the second main body section, the second main body section is located between the flange portion and the end wall, and the second extension section extends into the pole hole.

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

[0018] In one of the embodiments, an insulating heat sink is further included, and the insulating heat sink is filled in 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 above-mentioned shell assembly presses the pole against the end wall of the shell by causing the shell itself to arch and bend to form a flange, so that the pole can be fixed to the shell without the help of an upper plastic part. Moreover, the annular protrusion formed by the arch of the end wall is a double-layer structure, and the flange formed by the bending is also a double-layer structure, so the flange is not easy to rebound after pressing the pole, and the fixing effect on the pole is better. In addition, the connection strength between the pole and the shell is positively correlated with the radial dimensions of the flange and the flange, and is not affected by the height of the pole, so the height of the pole can be significantly shortened. Furthermore, since the pole does not need to extend into the interior of the shell, the pole will not occupy the space inside the shell. Therefore, the space utilization rate of the above-mentioned shell assembly in the height direction is high, thereby being able to improve the energy density.

[0021] On the other hand, the present application provides a battery cell, comprising a shell assembly, a battery cell and a current collecting plate as described in any one of the preferred embodiments above, wherein the battery cell and the current collecting plate are accommodated in the shell, and the electrode tab at one end of the battery cell is electrically connected to the electrode through the current collecting plate.

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

[0023] In addition, the present application provides an electrical device, comprising a battery cell as described in the above preferred embodiment or a battery as described in the above preferred embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

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

[0026] Figure 2 for Figure 1 an 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 a part A in the housing assembly shown;

[0029] Figure 5 for Figure 1 A schematic diagram of the structure of the housing assembly in an intermediate state;

[0030] Figure 6 for Figure 5 A cross-sectional view of the housing assembly in an intermediate state is shown. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] The present invention discloses an electric device, a battery and a battery cell. The electric device includes the battery or the battery cell, and can be provided with electric energy by the battery or the battery cell. The electric device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, an amusement equipment, an elevator and a lifting device, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy or an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The energy storage device can be an energy storage wall, a base station energy storage, a container energy storage, etc. The amusement equipment can be a carousel, a jumping machine, etc. This application does not impose any special restrictions on the above-mentioned electrical devices.

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

[0039] The above-mentioned battery can be a battery pack or a battery module. When the above-mentioned battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and a plurality of the above-mentioned battery cells. The plurality of battery cells can be electrically connected in series, in parallel, or in a mixture of series and parallel, and communicated with the battery management system to form a battery pack, and the above-mentioned battery management system controls and monitors the working status of each battery cell. In addition, the plurality of battery cells can also be first connected in series and / or in parallel, and form a battery module with the module management system, and then the plurality of battery modules are electrically connected in series, in parallel, or in a mixture of series and parallel, and together with the battery management system form a battery pack.

[0040] The battery pack or battery module may be mounted on a supporting structure such as a box, a frame, or a bracket, and the battery cells and the battery management system may be electrically connected to each other through a busbar, such as a bar. The battery cells may be lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. Specifically, in the present embodiment, the battery cells are lithium-ion cylindrical batteries.

[0041] See also Figure 1 The present invention further provides a housing assembly 100. The battery cell comprises a housing assembly 100, a battery cell (not shown) and a current collecting plate (not shown).

[0042] The battery cell is the core component of the battery cell and is housed in the outer shell assembly 100. The battery cell is generally formed by winding a positive electrode sheet, a negative electrode sheet, and a diaphragm that acts as an insulator between the negative electrode sheet and the positive electrode sheet. Specifically, the battery cell in this embodiment is cylindrical, and a positive electrode ear and a negative electrode ear are respectively provided at both ends. Normally, the positive electrode ear is electrically connected to the pole 120 of the outer shell assembly 100 through the positive electrode collector disk, and the negative electrode ear is electrically connected to the shell 110 of the outer shell assembly 100 through the negative electrode collector disk. Therefore, the pole 120 and the shell 110 will serve as the positive terminal and negative terminal of the battery cell, respectively.

[0043] Please also read Figure 2 In one embodiment of the present invention, a housing assembly 100 includes a housing 110 , a pole 120 and a sealing member 130 .

[0044] The shell 110 is a tubular structure, specifically a cylindrical shape. The shell 110 can be an aluminum shell or a steel shell, preferably a steel shell, which has a higher structural strength. The end wall at one end of the shell 110 is provided with a pole hole 101, and the other end is usually provided with an opening (not shown) for placing the battery cell and the collector plate. After the battery cell is assembled, the opening can be sealed by a cover plate (not shown). Furthermore, the end wall of the shell 110 is arched outward along the annular area extending circumferentially from the pole hole 101 to form an annular protrusion 111 (see Figure 5 and Figure 6The housing 110 can be formed by a stamping process, thereby obtaining an integrally formed annular protrusion 111. Moreover, the annular protrusion 111 is a double-layer structure, and its radial cross section is generally inverted U-shape.

[0045] The pole 120 includes a main body 121 and a flange 122, wherein the flange 122 extends from the periphery of one end of the main body 121 along the radial direction of the main body 121. The main body 121 may be cylindrical, and the flange 122 may be disc-shaped, and the outer diameter of the flange 122 is greater than the outer diameter of the main body 121. It can be seen that the pole 120 is in an inverted T shape as a whole.

[0046] Please also read Figure 3 and Figure 4 When the housing assembly 100 is assembled, the pole 120 is arranged in the area surrounded by the annular protrusion 111 and covers the pole hole 101. The flange 122 of the pole 120 faces the inside of the housing 110 and abuts against the edge of the pole hole 101, that is, the area of ​​the end wall of the housing 110 located inside the annular protrusion 111. Further, the annular protrusion 111 is bent toward the pole hole 101 and forms a flange 112, and the flange 112 presses the flange 122 against the end wall. The flange 112 is also annular and extends along the circumference of the pole hole 101. The flange 112 is formed by bending the annular protrusion 111, that is, the flange 112 is another form of the annular protrusion 111. In the assembled housing assembly 100, the annular protrusion 111 does not exist. Moreover, since the annular protrusion 111 is a double-layer structure, the flange 112 formed by the bending is also a double-layer structure.

[0047] The flange portion 122 is clamped between the flange 112 and the end wall of the shell 110, so as to fix the pole 120 to the shell 110. That is, the pole 120 can be fixed to the shell 110 without the help of the upper plastic part. The upper plastic part is large in size, and its removal can save space in the height direction and reduce the number of components, thereby achieving the purpose of simplifying the battery cell structure. In addition, the upper plastic part is also easily deformed due to secondary crystallization, electrolyte corrosion, etc., which leads to a decrease in the connection strength between the pole 120 and the shell 110. The flange 112 will not be affected by the above factors, and the double-layer flange 112 is not easy to rebound after pressing the pole 120, and the fixing effect of the pole 120 is better.

[0048] Compared with the traditional I-shaped pole, the T-shaped pole 120 in the present application is lower in height. Moreover, the connection strength between the pole 120 and the housing 110 is related to the radial dimensions of the flange 122 and the flange 112, and is not affected by the height of the pole 120. The larger the radial dimensions of the flange 122 and the flange 112, the larger the contact area between the two, and the better the compression and fixing effect of the flange 122. Therefore, in order to ensure the connection strength, it is only necessary to ensure that the radial dimension of the pole 120 is large, and the height of the pole 120 can be significantly shortened.

[0049] Furthermore, since the pole 120 does not need to extend into the housing 110, the pole 120 does not occupy the space inside the housing 110. Therefore, the 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 again Figure 2 and Figure 4 In this embodiment, the area of ​​the end wall of the shell 110 located on the inner side of the annular protrusion 111 sinks into the shell 110 to form an annular step 113 supporting the pole 120, and 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 on the outer side of the annular protrusion 111.

[0051] The above inner surface refers to the surface facing the inside of the shell 110. Due to the above height difference, when the inner surface of the annular step 113 abuts against the collector plate, a gap will be formed between the inner surface of the area of ​​the shell 110 located outside the annular protrusion 111 and the collector plate or the battery cell. The gap can be used to set a lower insulating member (not shown) to effectively isolate the shell 110 from the battery cell. Moreover, by setting the annular step 113, the pole 120 can also sink toward the inside of the shell 110 during assembly, so that the space occupied by the lower insulating member in the height direction can be reasonably utilized, 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 collector plate or the battery cell is too small, so the thickness of the lower insulating member that can be installed is too low, and it cannot play a good isolation and insulation role; and if the height difference is greater than 1.5 mm, it will cause a waste of space in the height direction.

[0053] The seal 130 can form a seal between the pole 120 and the housing 110. Therefore, leakage between the pole 120 and the housing 110 can be avoided. In addition, the seal 130 can generally also play an insulating role to prevent the pole 120 and the housing 110 from being connected and short-circuited. Of course, the pole 120 and the housing 110 can also be insulated by coating an insulating layer.

[0054] In this embodiment, the seal 130 includes a first sealing section 131 and two second sealing sections 132 . The two second sealing sections 132 are respectively clamped between the flange portion 122 and 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 formed of materials such as rubber and silicone. One second sealing section 132 is clamped between the outer surface of the flange portion 122 and the flange 112, and the other second sealing section 132 is clamped between the inner surface of the flange portion 122 and the end wall, specifically between the sunken step 113. The seal 130 is annular as a whole and extends along the circumference of the flange portion 122. Moreover, the two second sealing sections 132 are respectively connected to the two ends of the first sealing section 131, so that the radial cross-section of the seal 130 is roughly U-shaped. The cooperation between the first sealing section 131 and the second sealing section 132 can significantly extend the sealing path between the pole 120 and the shell 110, thereby improving the sealing and insulation effects.

[0056] In addition, in the present embodiment, the flange 112 includes two layers of annular walls 1121 stacked on each other, and the two annular walls 1121 are welded by a welding portion (not marked in the figure).

[0057] Specifically, the two layers of annular wall 1121 can be welded together by laser penetration welding or other methods, thereby increasing the structural strength of the flange 112 and further improving the fixing effect on the pole 120. When the battery cell undergoes thermal runaway and causes the internal pressure of the housing 110 to increase, it can ensure that the pole 120 will not rush out due to the rebound of the flange 112, thereby avoiding damage to the entire battery module and battery pack.

[0058] Furthermore, in this embodiment, the orthographic projection of the welding portion on the flange portion 122 is located on the side of the first sealing section 131 facing the pole hole 101, and is spaced apart from the first sealing section 131. That is, along the radial direction of the pole 120, there is a space between the welding portion and the first sealing section 131. In this way, when laser welding is performed on the two layers of the annular wall 1121, the influence of the welding process on the first sealing section 131 can be effectively reduced, and the first sealing section 131 can be prevented from being damaged. Since the first sealing section 131 plays a major sealing role, it can ensure that the sealing effect of the sealing member 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 welding portion penetrates the metal sheet 140. There may be a gap between the two annular walls 1121 of the flange 112, which may lead to risks such as explosion points and cracking during laser penetration welding. The metal sheet 140 is generally made of the same material as the shell 110, and can fill the gap between the two annular walls 1121, thereby ensuring that the formed welding portion is uniform and reliable. Specifically, the metal sheet 140 can be inserted from the inner side of the annular protrusion 111 before it is bent, and then bent together with the annular protrusion 111.

[0060] Please refer again Figure 2 and Figure 4In this embodiment, the housing assembly 100 also includes a first insulating gasket 150, which includes a first main section 151 and a first extension section 152 bent and extended from one end of the first main section 151, the first main section 151 is located between the flange portion 122 and the flange 112, and the first extension section 152 extends between the main section 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 can further improve the insulation performance between the housing 110 and the pole 120. Moreover, the first main body section 151 is located on the side of the seal 130 facing away from the flange 122, so it can also form a shield between the flange 112 and the seal 130. In this way, the first insulating gasket 150 can also prevent the laser beam or high-temperature materials from damaging the second sealing section 132 when the two layers of annular walls 1121 of the flange 112 are laser welded.

[0062] Furthermore, in this embodiment, gaps are formed between the two sides of the first extension section 152 and the main body 121 and the flange 112. Therefore, the first insulating gasket 150 does not block the areas on both sides, and when the annular protrusion 111 is dug to press the pole 120 or the flange 112 is welded, it is convenient for the device to perform visual identification and positioning.

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

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

[0065] Specifically in this embodiment, a gap is formed between the second extension section 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 portion 122, the gap can keep the collector plate away from the end wall of the housing 110.

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

[0067] The pole 120 is used as an electrode output terminal, and usually generates more heat. The insulating heat sink 170 is in contact with the pole 120 and the shell 110 at the same time, and can quickly transfer the heat of the pole 120 to the shell 110 and dissipate it through the shell 110, thereby preventing the pole 120 from overheating. The insulating heat sink 170 can also be formed of phase change materials, such as silicone grease, and can use state switching to quickly dissipate heat. Moreover, by utilizing this characteristic of the phase change material, the welding temperature can be used to melt the phase change component when the double-layer annular wall 1121 is used, and it can better penetrate into the gap. After solidification again, the formed insulating heat sink 170 can better adapt to the shape of the gap between the main body 121 and the flange 112.

[0068] The housing assembly 100, by causing the housing 110 to arch and bend to form the flange 112, presses the pole 120 against the end wall of the housing 110, so that the pole 120 can be fixed to the housing 110 without the help of the upper plastic part. Moreover, the annular protrusion 111 formed by the arching of the end wall is a double-layer structure, and the flange 112 formed by the bending is also a double-layer structure, so the flange 112 is not easy to rebound after pressing the pole 120, and the fixing effect of the pole 120 is better. In addition, the connection strength between the pole 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 pole 120, so the height of the pole 120 can be significantly shortened. Further, since the pole 120 does not need to extend into the interior of the housing 110, the pole 120 will not occupy the space inside the housing 110. Therefore, the space utilization rate of the housing assembly 100 in the height direction is high, so that the energy density can be improved.

[0069] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A housing assembly, characterized in that: include: A shell, wherein an end wall at one end of the shell is provided with a pole hole, and an annular area of ​​the end wall extending circumferentially along the pole hole is arched outward to form an annular protrusion; A pole, comprising a main body and a flange extending from the periphery of one end of the main body in the radial direction of the main body, the pole is arranged in the area surrounded by the annular protrusion and covers the pole hole, the annular protrusion is bent toward the pole hole and forms a flange for pressing the flange against the end wall; and A sealing member is capable of forming a seal between the pole and the housing.

2. The housing assembly according to claim 1, characterized in that The area of ​​the end wall located inside the annular protrusion sinks into the shell to form an annular step supporting the pole, and there is a height difference between the inner surface of the annular step and the inner surface of the area 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 in the area 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, wherein: The flange includes two layers of annular walls stacked on each other, and the two annular walls are welded through a welding portion.

5. The housing assembly according to claim 4, characterized in that: A metal sheet is sandwiched between the two annular walls, and the welding portion penetrates through the metal sheet.

6. The housing assembly according to claim 4, characterized in that The sealing member includes a first sealing segment and two second sealing segments, wherein the two second sealing segments are respectively clamped between the flange portion, the flange and the end wall, and the first sealing segment covers the periphery of the flange portion and is connected to the two second sealing segments.

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

8. The housing assembly according to claim 1, wherein: It also includes a first insulating gasket, which includes a first main section and a first extension section bent and extended from one end of the first main section, the first main section is located between the flange portion and the flange, and the first extension section extends between the main section and the flange.

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

10. The housing assembly according to claim 1, wherein: It also includes a second insulating gasket, which includes a second main body section and a second extension section bent and extended from one end of the second main body section, the second main body section is located between the flange portion and the end wall, and the second extension section extends into the pole hole.

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

12. The housing assembly according to claim 11, wherein: It also includes an insulating heat sink, which is filled in the gap between the main body and the flange.

13. A battery cell, characterized in that: It comprises a shell assembly, a battery cell and a current collecting plate as described in any one of claims 1 to 12 above, wherein the battery cell and the current collecting plate are accommodated in the shell, and the pole lug at one end of the battery cell is electrically connected to the pole through the current collecting plate.

14. A battery, characterized in that: The battery comprises a plurality of battery cells as claimed in claim 13.

15. An electrical device, characterized in that: The invention comprises a battery cell as claimed in claim 13 or a battery as claimed in claim 14.

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