Cylindrical batteries and their housing assemblies and battery packs

Abstract

This utility model relates to the field of battery technology and proposes a cylindrical battery, its casing assembly, and a battery pack. The casing assembly includes a casing, a positive electrode post inserted into the casing, and a sealing part disposed between the positive electrode post and the casing. The casing includes a casing body, an outer insulating member and an inner insulating member disposed between the casing body and the positive electrode post, and an installation space is formed between the inner insulating member, the outer insulating member, the casing body, and the positive electrode post. The sealing part is disposed within the installation space and is used to seal the gap between the casing and the positive electrode post. A preset gap exists between the inner insulating member and the casing body, and the interior of the casing body communicates with the installation space through the preset gap. A communicating channel is provided on the outer insulating member, connecting the installation space to the outside. The casing assembly of this utility model, by setting a preset gap between the inner insulating member and the casing body and providing a communicating channel on the outer insulating member, allows for the detection of leaks in the sealing part during sealing tests.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a housing assembly. It also relates to a cylindrical battery with the housing assembly and a battery pack with the cylindrical battery. Background Technology

[0002] Cylindrical batteries mainly consist of a casing, cells, and a positive terminal. The negative terminal cover is welded to the casing as a single unit, and one end of the positive terminal is inserted into the casing, with a sealing ring between them. However, in existing technologies, helium sampling cannot effectively detect cases where the sealing ring is missing. This problem directly leads to frequent occurrences of defects such as seal failure and terminal leakage during the production and use of cylindrical cells. Seal failure not only reduces the performance and lifespan of the cell but may also cause safety hazards such as short circuits. Furthermore, leakage can corrode electronic components around the cell, seriously affecting the normal operation of equipment. Utility Model Content

[0003] In view of this, the present invention aims to provide a housing assembly capable of detecting leaks in the sealing parts.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A housing assembly includes a housing, a positive terminal inserted into the housing, and a sealing portion disposed between the positive terminal and the housing;

[0006] The housing includes a housing body, an outer insulating member disposed between the outer side of the housing body and the positive electrode post, and an inner insulating member disposed between the inner side of the housing body and the positive electrode post. An installation space is formed between the inner insulating member, the outer insulating member, the housing body and the positive electrode post. The sealing part is disposed in the installation space and is used to seal the gap between the housing and the positive electrode post.

[0007] There is a preset gap between the inner insulating component and the housing body. The interior of the housing body is connected to the installation space through the preset gap. The outer insulating component is provided with a connecting channel, which connects the installation space to the outside.

[0008] Furthermore, the connecting channel includes a lower groove on the side of the outer insulating member near the housing body, an upper groove on the other side of the outer insulating member, and a through hole connecting the upper groove and the lower groove;

[0009] The lower groove is connected to the mounting space, and the upper groove is connected to the outside.

[0010] Furthermore, the top of the positive electrode post has a limiting protrusion that bulges outward along its own radial direction, and the outer insulating member is an annular ring surrounding the positive electrode post;

[0011] The external insulating component includes a main body sandwiched between the limiting protrusion and the housing body, and a protruding ring surrounding the limiting protrusion. The protruding ring protrudes towards the side of the main body opposite to the housing body. The communicating channel is provided on the main body. There is a first radial gap between the protruding ring and the limiting protrusion. The communicating channel communicates with the outside through the first radial gap.

[0012] Furthermore, the lower groove extends radially along the body to the inner side of the body, and the upper groove extends radially along the body to the convex ring; and / or,

[0013] The lower grooves are multiple grooves spaced apart along the circumference of the outer insulating member, and the upper grooves are arranged in a one-to-one correspondence with the lower grooves.

[0014] Furthermore, the connecting channel includes a first groove on the side of the outer insulating member near the housing body, a second groove on the other side of the outer insulating member, and a through hole connecting the first groove and the second groove;

[0015] The second groove is connected to the mounting space, and the first groove is connected to the outside.

[0016] Furthermore, the first groove extends radially along the outer insulating member to the outer side of the outer insulating member;

[0017] The housing body has a receiving groove in the middle, the outer insulating member is disposed in the receiving groove, and a second radial gap is provided between the outer insulating member and the side wall of the receiving groove.

[0018] Furthermore, the positive electrode post includes an electrode post body and a riveting block disposed at the bottom of the electrode post body, the riveting block being arranged around the positive electrode post;

[0019] The inner insulating member is an annular ring surrounding the pole body, and the inner insulating member is sandwiched between the riveting block and the housing body. The preset gap is located between the top of the inner insulating member and the housing body.

[0020] Furthermore, in the radial direction of the positive electrode post, the outer insulating member, the housing body, and the inner insulating member sequentially approach the positive electrode post;

[0021] The sealing portion includes a sealing gasket disposed within the mounting space. The sealing gasket includes a first portion abutting against the inner insulating member and a second portion radially outwardly protruding along the first portion, the second portion abutting against the housing body.

[0022] Compared with the prior art, this utility model has the following advantages:

[0023] The housing assembly described in this utility model effectively isolates the positive terminal from the housing body by providing inner and outer insulating components located between the housing body and the positive terminal, thereby significantly reducing the risk of internal short circuits in the battery. Furthermore, by setting a preset gap between the inner insulating component and the housing body, and by providing a connecting channel in the outer insulating component, the interior of the housing body and the installation space can be interconnected with the outside environment. During sealing testing, any missing seals can be detected, thus reducing the product defect rate and consequently mitigating battery malfunctions and safety risks caused by sealing failures.

[0024] The connecting channel employs a combination of a lower groove, a through hole, and an upper groove, resulting in a simple structure that facilitates manufacturing. Furthermore, it allows for easy cleaning and inspection of the channel's interior, effectively ensuring the accuracy of sealing tests. By including a main body and a raised ring in the outer insulating component, and a radially protruding limiting protrusion at the top of the positive electrode post, with the main body sandwiched between the limiting protrusion and the housing body, and the raised ring surrounding the limiting protrusion, not only is the installation of the outer insulating component convenient, but the insulation effect between the positive electrode post and the housing body is also improved. In addition, by establishing a first radial gap between the raised ring and the limiting protrusion, and placing the connecting channel on the main body, external impurities are effectively blocked while ensuring sealing tests, and the risk of electrolyte leakage from inside the battery is also reduced.

[0025] Extending the lower groove radially inwards along the main body and the upper groove extending to the convex ring shortens the path length of the detection gas between the outside and the installation space, reducing gas transmission resistance and allowing the installation space to fill more quickly, thus enabling rapid detection of leaks in the sealing cloth. Furthermore, arranging multiple lower grooves circumferentially spaced along the outer insulation component, with corresponding upper grooves, increases the inlet area for gas to enter the installation space, allowing for simultaneous multi-point gas intake. This not only accelerates the gas filling speed but also ensures a more uniform gas distribution within the installation space, improving the efficiency and accuracy of the sealing performance test.

[0026] The connecting channel includes a first groove, a second groove, and a through hole between them. Its simple structure facilitates manufacturing. Furthermore, it allows for easy cleaning and inspection of the interior of the connecting channel, effectively ensuring the accuracy of sealing tests.

[0027] The first groove extends radially outward along the outer insulating component, facilitating rapid gas entry into the first groove and into the installation space through the through hole and the second groove, thereby enabling rapid detection of leaks in the seal. A receiving groove is provided in the middle of the housing body for installing the outer insulating component. A second radial gap is provided between the outer insulating component and the sidewall of the receiving groove, which not only facilitates the assembly of the outer insulating component but also allows communication between the first groove and the outside environment.

[0028] A rivet block is installed on the positive electrode post, and the inner insulating component is arranged in a ring between the rivet block and the housing body, facilitating the installation of the inner insulating component. The rivet block surrounds the positive electrode post, increasing the contact area between the positive electrode post, the inner insulating component, and the housing body, thus improving the stability of the inner insulating component and the positive electrode post and enhancing the overall structural strength. A pre-set gap is located between the top of the inner insulating component and the housing body, facilitating communication between the interior of the housing body and the installation space.

[0029] By positioning the outer insulating component, the housing body, and the inner insulating component sequentially close to the positive electrode post in the radial direction, and by having the first part of the sealing gasket abut against the inner insulating component and the second part protrude radially outward and abut against the housing body, the sealing gasket can tightly fit the positive electrode post and the housing body, effectively filling the gap between them and preventing external moisture, dust, and other impurities from entering the battery. This also prevents internal electrolyte leakage, thereby improving sealing performance and reducing the risk of battery failure caused by sealing failure.

[0030] In addition, another objective of this invention is to provide a cylindrical battery having a housing assembly as described above.

[0031] The cylindrical battery of this invention features a casing assembly that not only provides excellent sealing, effectively preventing electrolyte leakage and avoiding performance degradation or malfunction due to short circuits or corrosion, but also facilitates rapid detection of missing or failed seals, thus reducing product defect rates.

[0032] In addition, another objective of this utility model is to provide a battery pack, wherein the battery pack is provided with cylindrical batteries as described above.

[0033] The battery pack of this invention has all the beneficial effects of the cylindrical battery mentioned above, which will not be repeated here. Attached Figure Description

[0034] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0035] Figure 1This is an exemplary structural diagram of the housing assembly described in Embodiment 1 of this utility model;

[0036] Figure 2 for Figure 1 A schematic diagram of the structure shown from another perspective;

[0037] Figure 3 for Figure 2 Sectional view of line AA in the middle;

[0038] Figure 4 for Figure 3 Enlarged view of section B;

[0039] Figure 5 for Figure 4 The diagram shows the structure when the sealing gasket is removed.

[0040] Figure 6 This is a schematic diagram of the structure of the pole body according to Embodiment 1 of this utility model;

[0041] Figure 7 This is a schematic diagram of the riveting block according to Embodiment 1 of this utility model;

[0042] Figure 8 This is a schematic diagram of the sealing gasket structure according to Embodiment 1 of this utility model;

[0043] Figure 9 This is a schematic diagram of the internal insulation component described in Embodiment 1 of this utility model;

[0044] Figure 10 This is a schematic diagram of the external insulating component described in Embodiment 1 of this utility model from a first perspective.

[0045] Figure 11 This is a schematic diagram of the external insulating component described in Embodiment 1 of this utility model from a second perspective.

[0046] Figure 12 This is a schematic diagram of the external insulating component described in Embodiment 1 of this utility model from a third-view perspective;

[0047] Figure 13 for Figure 12 A cross-sectional view of the CC line;

[0048] Figure 14 This is a schematic diagram of another exemplary structure of the housing assembly described in Embodiment 2 of this utility model;

[0049] Figure 15 for Figure 14 A schematic diagram of the structure shown from another perspective;

[0050] Figure 16 for Figure 15 Enlarged view of section E in the middle;

[0051] Figure 17 for Figure 16 The diagram shows the structure when the sealing gasket is removed.

[0052] Figure 18 This is a schematic diagram of the external insulating component described in Embodiment 2 of this utility model from a first perspective.

[0053] Figure 19 This is a schematic diagram of the external insulating component described in Embodiment 2 of this utility model from a second perspective.

[0054] Figure 20 This is a schematic diagram of the external insulating component described in Embodiment 2 of this utility model from a third-view perspective;

[0055] Figure 21 for Figure 20 A cross-sectional view of the FF line.

[0056] Explanation of reference numerals in the attached figures:

[0057] 1. Housing body; 2. Positive electrode post; 3. Outer insulation component; 4. Inner insulation component; 5. Sealing gasket; K. Installation space; 201. Electrode post body; 2011. Limiting protrusion; 202. Riveting block; 2021. Mounting groove;

[0058] 301. Main body; 3011. Upper groove; 3012. Through hole; 3013. Lower groove; 3014. Second groove; 3015. Through hole; 3016. First groove; 302. Protruding ring;

[0059] 501. Part One; 502. Part Two. Detailed Implementation

[0060] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0061] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., 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 utility model 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 utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0063] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0064] Example 1

[0065] Given that existing technologies cannot effectively detect missing sealing rings using helium silicate detectors, leading to frequent defects such as seal failure and terminal leakage during the production and use of cylindrical battery cells, this not only reduces cell performance and lifespan but may also cause safety hazards such as short circuits. Therefore, this embodiment proposes a housing assembly capable of detecting missing sealing rings.

[0066] In terms of overall structure, the housing assembly of this embodiment includes a housing, a positive terminal 2 inserted into the housing, and a sealing portion disposed between the positive terminal 2 and the housing. The housing includes a housing body 1, an outer insulating member 3 disposed between the outer side of the housing body 1 and the positive terminal 2, and an inner insulating member 4 disposed between the inner side of the housing body 1 and the positive terminal 2. An installation space K is formed between the inner insulating member 4, the outer insulating member 3, the housing body 1, and the positive terminal 2. The sealing portion is disposed within the installation space K and is used to seal the gap between the housing and the positive terminal 2.

[0067] Furthermore, there is a preset gap L between the inner insulating component 4 and the housing body 1, and the interior of the housing body 1 is connected to the installation space K through the preset gap L. The outer insulating component 3 is provided with a connecting channel, which connects the installation space K with the outside world.

[0068] In this embodiment, the housing assembly effectively isolates the positive terminal 2 from the housing body 1 by providing inner and outer insulating components 3 between the housing body 1 and the positive terminal 2, thereby effectively reducing the risk of internal short circuits in the battery. Furthermore, by providing a preset gap L between the inner insulating component 4 and the housing body 1, and by providing a connecting channel in the outer insulating component 3, allowing the interior of the housing body 1 and the installation space K to communicate with the outside, leaks in the sealing part can be detected during the sealing test. This reduces the product defect rate and, consequently, reduces battery malfunctions and safety risks caused by sealing failure.

[0069] Based on the above overview, an exemplary structure of the housing assembly in this embodiment is described below. Figures 1 to 5As shown, the shell body 1 is generally cylindrical, and during manufacturing, it is typically connected to the negative electrode cover plate to carry the negative electrode. Furthermore, the welded negative electrode cover plate can specifically form... Figure 1 The housing body 1 shown has an end portion at one end of the positive terminal post 2, which can also form an end portion at the other end of the housing body 1.

[0070] In this embodiment, see Figure 4 and Figure 5 As shown, and in Figure 5 The diagram illustrates the gas flow path. In a preferred embodiment, the connecting channel includes a lower groove 3013 on the side of the outer insulating member 3 near the housing body 1, an upper groove 3011 on the other side of the outer insulating member 3, and a through hole 3012 connecting the upper groove 3011 and the lower groove 3013. The lower groove 3013 communicates with the installation space K, and the upper groove 3011 communicates with the outside. Using a combination of the lower groove 3013, through hole 3012, and upper groove 3011 for the connecting channel results in a simple structure that is easy to manufacture. Furthermore, it facilitates cleaning and inspection of the interior of the connecting channel, effectively ensuring the accuracy of the sealing test.

[0071] Specifically, in combination Figures 5 to 7 As shown in the diagram, in a preferred embodiment, the positive electrode post 2 includes an electrode post body 201 and a riveting block 202 disposed at the bottom of the electrode post body 201, the riveting block 202 being disposed around the positive electrode post 2. Meanwhile, the inner insulating member 4 is annularly arranged around the electrode post body 201, and is sandwiched between the riveting block 202 and the housing body 1, with a preset gap L located between the top of the inner insulating member 4 and the housing body 1.

[0072] Here, a rivet block 202 is installed on the positive electrode post 2, and the inner insulating component 4 is annularly sandwiched between the rivet block 202 and the housing body 1, facilitating the installation of the inner insulating component 4. The rivet block 202 surrounds the positive electrode post 2, increasing the contact area between the positive electrode post 2, the inner insulating component 4, and the housing body 1, improving the stability of the inner insulating component 4 and the positive electrode post 2, thereby enhancing the overall structural strength. Furthermore, a preset gap L is located between the top of the inner insulating component 4 and the housing body 1, facilitating communication between the interior of the housing body 1 and the installation space K.

[0073] In specific implementation, the pole body 201 and the riveting block 202 can be riveted together and then further welded together to improve the connection strength between them. Alternatively, the riveting block 202 can be omitted, and the pole body 201 can be directly abutted against the inner insulating component 4. However, this might reduce the stability of the inner insulating component 4. Furthermore, the machining precision of the riveting block 202 is easier to control than that of the pole body 201, which is more conducive to ensuring the abutment effect between the riveting block 202 and one side of the inner insulating component 4.

[0074] In addition, to facilitate the connection between the pole body 201 and the riveting block 202, such as Figure 7 As shown, a mounting groove 2021 is formed at the bottom of the riveting block 202, and part of the pole post body 201 is located within the mounting groove 2021. This further improves the connection strength between the pole post body 201 and the riveting block 202, thereby enhancing the support effect on the pole post body 201. Additionally, as... Figure 4 and Figure 6 As shown, the top of the positive terminal post 2 also has a limiting protrusion 2011 that bulges outward along its own radial direction to limit the displacement of the outer insulation member 3.

[0075] Combination Figure 4 , Figure 5 and Figure 8 As shown, in a preferred embodiment, the outer insulating member 3, the housing body 1, and the inner insulating member 4 sequentially approach the positive electrode post 2 in the radial direction. Correspondingly, the sealing portion includes a sealing gasket 5 disposed within the mounting space K. The sealing gasket 5 includes a first portion 501 abutting against the inner insulating member 4, and a second portion 502 protruding radially outward along the first portion 501, the second portion 502 abutting against the housing body 1. Furthermore, the sealing portion specifically abuts against the positive electrode post 2 via the first portion 501.

[0076] This design allows the sealing gasket 5 to fit tightly against the positive electrode post 2 and the casing body 1, effectively filling the gap between them and preventing external moisture, dust, and other impurities from entering the battery. It also prevents internal electrolyte leakage, significantly improving sealing performance and reducing the risk of battery failure due to seal failure. Furthermore, this structure enhances the structural stability of the entire casing assembly. Moreover, by including a first part 501 and a second part 502 in the sealing gasket 5, it can better adapt to the surface shape and positional relationships of different components during installation, thus improving assembly efficiency.

[0077] In a specific implementation, the sealing gasket 5 can be made of commonly used rubber, the inner insulating component 4 can be made of polypropylene, and the outer insulating component 3 can be made of polyphenylene sulfide. Of course, in addition to the inner insulating component 4 being made of polypropylene and the outer insulating component 3 being made of polyphenylene sulfide, both can also be made of commonly used insulating materials in the art. This embodiment does not specifically limit them in this way.

[0078] Specifically, combined Figure 4 , Figure 5 and Figure 9As shown, for better insulation, the inner insulating member 4 extends radially towards the side wall of the housing body 1 along the positive electrode post 2, and has a gap between it and the side wall of the housing body 1. This design allows gas inside the housing body 1 to communicate with the installation space K through the preset gap L between the top of the inner insulating member 4 and the top wall of the housing body 1 during sealing tests. Furthermore, to effectively ensure the installation stability of the inner insulating member 4 and the communication between the interior of the housing body 1 and the installation space K, the preset gap L is preferably set between 0.01mm and 0.1mm. For example, the preset gap L can be set to 0.01mm, 0.03mm, 0.07mm, 0.1mm, or other values.

[0079] Furthermore, since the inner insulating member 4 is clamped onto the housing body 1 solely by the riveting block 202 on its inner side, in this further embodiment, such as Figure 5 and Figure 9 As shown, the inner insulating member 4 has protruding portions, which can be multiple portions spaced apart radially thereon, for example, they can be... Figure 9 The two shown are examples. By providing this protrusion, the structural strength of the inner insulation member 4 can be improved, thereby effectively reducing the degree of collapse of the outer portion of the inner insulation member 4.

[0080] Reference Figures 10 to 13 As shown in the diagram, in a preferred embodiment, the outer insulating member 3 is an annular ring surrounding the positive electrode post 2. Furthermore, the outer insulating member 3 includes a main body 301 sandwiched between the limiting protrusion 2011 and the housing body 1, and a protruding ring 302 surrounding the limiting protrusion 2011, with the protruding ring 302 protruding towards the side of the main body 301 opposite to the housing body 1. Wherein, as... Figure 5 As shown, a connecting channel is provided on the main body 301, and there is a first radial gap L1 between the convex ring 302 and the limiting protrusion 2011. The connecting channel is connected to the outside through the first radial gap L1.

[0081] By including a main body 301 and a convex ring 302 in the outer insulating component 3, and providing a radially outwardly protruding limiting protrusion 2011 on the top of the positive electrode post 2, and by clamping the main body 301 between the limiting protrusion 2011 and the housing body 1, with the convex ring 302 surrounding the limiting protrusion 2011, the installation of the outer insulating component 3 is facilitated, and the insulation effect between the positive electrode post 2 and the housing body 1 is improved. Furthermore, by providing a first radial gap L1 between the convex ring 302 and the limiting protrusion 2011, and by providing a connecting channel on the main body 301, the sealing performance can be ensured while effectively blocking external impurities and reducing the risk of electrolyte leakage inside the battery. Preferably, the first radial gap L1 is between 0.01mm and 0.1mm. For example, the first radial gap L1 can be set to 0.01mm, 0.03mm, 0.07mm, 0.1mm, or other values.

[0082] In addition, refer to Figure 10 and Figure 11 As shown in the diagram, in a preferred embodiment, the lower groove 3013 extends radially along the body 301 to the inner side of the body 301, and the upper groove 3011 extends radially along the body 301 to the protruding ring 302. This design can significantly shorten the path length of the detection gas from the outside into the installation space K, reduce gas transmission resistance, and thus quickly detect cases of missing parts or structural defects in the sealing part.

[0083] In another preferred embodiment, multiple lower grooves 3013 are spaced apart along the circumference of the outer insulating member 3, with upper grooves 3011 corresponding to lower grooves 3013 one-to-one. This arrangement increases the inlet area for gas to enter the installation space K, enabling simultaneous gas intake at multiple points. This design not only accelerates the gas filling speed but also makes the gas distribution within the installation space K more uniform, avoiding detection errors caused by uneven gas distribution and effectively improving the detection accuracy of leaks in the sealing part. Specifically, in this embodiment, four upper grooves 3011 and four lower grooves 3013 are evenly distributed along the circumference of the outer insulating member 3. It should be noted that the number of lower grooves 3013 can be one, five, or other quantities besides four.

[0084] The housing assembly of this embodiment, by adopting the above structure, not only ensures good sealing between the positive electrode post 2 and the housing, effectively preventing electrolyte leakage, but also detects cases of missing seals, thereby reducing the product defect rate.

[0085] Example 2

[0086] This embodiment also relates to a housing assembly, whose overall structure is the same as that of Embodiment 1. The difference lies in the structure of the connecting channel on the outer insulating member 3, while the structure of other components is the same as that of Embodiment 1, and will not be described again here. (Refer to...) Figures 14 to 17 As shown, the communication channel in this embodiment includes a first groove 3016 on the side of the outer insulating member 3 near the housing body 1, a second groove 3014 on the other side of the outer insulating member 3, and a through hole 3015 connecting the first groove 3016 and the second groove 3014. Furthermore, the second groove 3014 communicates with the mounting space K, and the first groove 3016 communicates with the outside world.

[0087] The communication channel in this embodiment includes a first groove 3016, a second groove 3014, and a through hole 3015 disposed between the two. The structure is simple and easy to manufacture. Furthermore, it facilitates cleaning and inspection of the interior of the communication channel, effectively ensuring the accuracy of the sealing test.

[0088] Among them, reference Figures 18 to 21 As shown, the overall structure of the outer insulating member 3 is the same as in Embodiment 1, also including a main body 301 and a raised ring 302 surrounding the limiting protrusion 2011. Furthermore, in this structure, it is not necessary to provide a gap for gas flow between the raised ring 302 and the limiting protrusion 2011. In a further embodiment, the first groove 3016 extends radially to the outer side of the outer insulating member 3. Simultaneously, a receiving groove is provided in the middle of the housing body 1, the outer insulating member 3 is disposed within the receiving groove, and a second radial gap L2 is provided between the outer insulating member 3 and the sidewall of the receiving groove.

[0089] At this point, by providing a receiving groove in the middle of the housing body 1 for installing the outer insulating component 3, and simultaneously providing a second radial gap L2 between the outer insulating component 3 and the side wall of the receiving groove, not only is it convenient to assemble the outer insulating component 3, but it also enables communication between the first groove 3016 and the outside world. It is understandable that when the receiving groove is not provided in the middle of the housing body 1, communication with the outside world can be achieved solely through the first groove 3016. However, this might significantly reduce the installation accuracy and efficiency of the outer insulating component 3, making it difficult to position it correctly in the assembly position. The second radial gap L2 is preferably set between 0.01mm and 0.1mm. For example, the second radial gap L2 can be set to 0.01mm, 0.03mm, 0.07mm, 0.1mm, or other values.

[0090] The housing assembly in this embodiment also provides a good seal between the positive electrode post 2 and the housing, effectively preventing electrolyte leakage and detecting any missing parts in the seal, thereby reducing the product defect rate.

[0091] Example 3

[0092] This embodiment relates to a cylindrical battery, which has a housing assembly as described in Embodiment 1 or Embodiment 2.

[0093] The cylindrical battery of this embodiment, by setting the casing assembly as described in Embodiment 1 or Embodiment 2, not only has good sealing performance, effectively preventing electrolyte leakage and avoiding performance degradation or failure due to short circuits, corrosion, and other problems, but also facilitates rapid detection of missing or failed sealing gaskets 5, thereby reducing the product defect rate.

[0094] In addition, this embodiment also relates to a battery pack, which is provided with cylindrical batteries as described above.

[0095] The battery pack of this embodiment has all the beneficial effects of the cylindrical battery mentioned above, which will not be repeated here.

[0096] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A housing assembly, characterized in that: It includes a housing, a positive terminal (2) inserted into the housing, and a sealing portion disposed between the positive terminal (2) and the housing; The housing includes a housing body (1), an outer insulating member (3) disposed between the outer side of the housing body (1) and the positive electrode post (2), and an inner insulating member (4) disposed between the inner side of the housing body (1) and the positive electrode post (2). An installation space (K) is formed between the inner insulating member (4), the outer insulating member (3), the housing body (1), and the positive electrode post (2). The sealing part is disposed in the installation space (K) and is used to seal the gap between the housing and the positive electrode post (2). There is a preset gap between the inner insulating component (4) and the housing body (1). The interior of the housing body (1) is connected to the installation space (K) through the preset gap. The outer insulating component (3) is provided with a connecting channel, which connects the installation space (K) to the outside.

2. The housing assembly according to claim 1, characterized in that: The communication channel includes a lower groove (3013) on the side of the outer insulating member (3) near the housing body (1), an upper groove (3011) on the other side of the outer insulating member (3), and a through hole (3012) connecting the upper groove (3011) and the lower groove (3013). The lower groove (3013) is connected to the mounting space (K), and the upper groove (3011) is connected to the outside.

3. The housing assembly according to claim 2, characterized in that: The top of the positive electrode post (2) has a limiting protrusion (2011) that bulges outward along its own radial direction, and the outer insulating member (3) is an annular ring surrounding the positive electrode post (2); The external insulating member (3) includes a main body (301) sandwiched between the limiting protrusion (2011) and the housing body (1), and a protruding ring (302) surrounding the limiting protrusion (2011). The protruding ring (302) protrudes toward the side of the main body (301) opposite to the housing body (1). The communicating channel is provided on the main body (301). There is a first radial gap between the protruding ring (302) and the limiting protrusion (2011). The communicating channel communicates with the outside through the first radial gap.

4. The housing assembly according to claim 3, characterized in that: The lower groove (3013) extends radially along the body (301) to the inner side of the body (301), and the upper groove (3011) extends radially along the body (301) to the protruding ring (302); and / or, The lower groove (3013) is a plurality of grooves spaced apart along the circumference of the outer insulating member (3), and the upper groove (3011) is provided in a one-to-one correspondence with the lower groove (3013).

5. The housing assembly according to claim 1, characterized in that: The communication channel includes a first groove (3016) on the side of the outer insulating member (3) near the housing body (1), a second groove (3014) on the other side of the outer insulating member (3), and a through hole (3015) connecting the first groove (3016) and the second groove (3014); The second groove (3014) is connected to the mounting space (K), and the first groove (3016) is connected to the outside.

6. The housing assembly according to claim 5, characterized in that: The first groove (3016) extends radially along the outer insulating member (3) to the outside of the outer insulating member (3); The housing body (1) has a receiving groove in the middle, the outer insulating member (3) is disposed in the receiving groove, and a second radial gap is provided between the outer insulating member (3) and the side wall of the receiving groove.

7. The housing assembly according to any one of claims 1 to 6, characterized in that: The positive electrode post (2) includes an electrode post body (201) and a riveting block (202) disposed at the bottom of the electrode post body (201), the riveting block (202) being disposed around the positive electrode post (2); The inner insulating member (4) is an annular ring surrounding the pole body (201), and the inner insulating member (4) is sandwiched between the riveting block (202) and the housing body (1). The preset gap is located between the top of the inner insulating member (4) and the housing body (1).

8. The housing assembly according to claim 7, characterized in that: In the radial direction of the positive electrode post (2), the outer insulating member (3), the housing body (1), and the inner insulating member (4) move toward the positive electrode post (2) in sequence; The sealing part includes a sealing gasket (5) disposed in the mounting space (K), the sealing gasket (5) including a first portion (501) abutting against the inner insulating member (4), and a second portion (502) radially protruding outward along the first portion (501), the second portion (502) abutting against the housing body (1).

9. A cylindrical battery, characterized in that: The cylindrical battery is provided with a housing assembly as described in any one of claims 1 to 8.

10. A battery pack, characterized in that: The battery pack is equipped with the cylindrical battery as described in claim 9.

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