Cylindrical battery and housing assembly thereof and battery pack

Abstract

The utility model relates to a battery technical field, especially a cylindrical battery and shell assembly and battery package thereof, the shell assembly includes the shell, the positive pole post of inserting on the shell and is located between the insulating component and sealing portion of both. The insulating component includes the outer insulating piece and inner insulating piece between the shell and the positive pole post, and the insulating component, the shell and the positive pole post are surrounded with the installation space, the sealing portion is located in the installation space, and is used for sealing the clearance between the shell and the positive pole post. The outer insulating piece has preset gap between the positive pole post, and the installation space is communicated with the outside through the preset gap, and the inner insulating piece is equipped with the communication channel, and the communication channel communicates the inside of the shell with the installation space. The shell assembly of the utility model, when missing the sealing portion, gas can be transmitted to the installation space through the communication channel, and then is transmitted to the outside through the preset gap, so as to be detected, thereby, the problem that the missing sealing portion cannot be detected in the prior art can be solved.

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, as a core component in the energy storage field, are mainly composed of key parts such as the casing, cell, and positive terminal. In the battery assembly process, the negative electrode cover is welded to the casing to form an integrated structure, while one end of the positive terminal penetrates the casing, with a sealing ring installed at the connection point. However, the helium detection currently used in the industry has blind spots and cannot effectively identify defects such as missing sealing rings. Sealing failure not only accelerates cell performance degradation and shortens lifespan, but may also cause short circuits due to electrolyte leakage, threatening the safe operation of equipment. Furthermore, leakage from the terminal can cause chemical corrosion of surrounding electronic components, directly affecting the stability and reliability of electronic 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 an insulating assembly and a sealing portion disposed between the positive terminal and the housing;

[0006] The insulating assembly includes an outer insulating member disposed between the outer side of the housing and the positive electrode post, and an inner insulating member disposed between the inner side of the housing and the positive electrode post. An installation space is formed between the insulating assembly, the housing 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 outer insulating component and the positive terminal post. The installation space is connected to the outside through the preset gap. The inner insulating component is provided with a connecting channel, which connects the inside of the housing with the installation space.

[0008] Furthermore, the connecting channel includes a lower groove and an upper groove disposed on two opposite sides of the inner insulating member, and a through hole connecting the lower groove and the upper groove;

[0009] The lower groove is located on the side of the inner insulating member facing away from the housing and communicates with the interior of the housing, while the upper groove communicates with the mounting space.

[0010] Furthermore, in the radial direction of the positive electrode post, the inner insulating member is close to the positive electrode post relative to the housing, and the upper groove extends radially to the inner side of the inner insulating member; and / or,

[0011] The lower grooves are multiple grooves spaced apart along the circumference of the inner insulating member, and the upper grooves are arranged in a one-to-one correspondence with the lower grooves.

[0012] Furthermore, the connecting channel includes a first groove at the bottom of the inner insulating member, a second groove at the top of the inner insulating member, and a through hole connecting the first groove and the second groove;

[0013] The first groove communicates with the mounting space, and the second groove communicates with the interior of the housing.

[0014] Furthermore, the inner insulating member is an annular ring surrounding the positive electrode post, and the second groove extends radially outward by a predetermined length along the inner insulating member;

[0015] In the radial direction of the inner insulating member, a venting gap is provided between the portion of the inner insulating member located outside the second groove and the housing, and the second groove communicates with the interior of the housing through the venting gap.

[0016] Furthermore, the outer insulating member is an annular ring surrounding the positive electrode post, and the preset length is greater than the radius of the outer insulating member;

[0017] The second groove has an outwardly projecting portion that protrudes outward relative to the outer insulation member along the radial direction of the outer insulation member.

[0018] Furthermore, in the radial direction of the positive electrode post, the outer insulating member, the housing, and the inner insulating member sequentially approach the positive electrode post;

[0019] 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 protruding outward along the first portion, the second portion abutting against the housing.

[0020] 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 includes a main body sandwiched between the limiting protrusion and the housing, and a convex ring disposed around the limiting protrusion, the convex ring protruding toward the side of the main body opposite to the housing.

[0021] The preset gaps include a first preset gap between the main body and the bottom of the limiting protrusion, and a second preset gap between the convex ring and the side of the limiting protrusion.

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

[0023] The housing assembly described in this utility model, by including an outer insulating component and an inner insulating component in the insulating component, not only achieves better insulation function, but also, together with the housing and the positive electrode post, encloses an installation space to house the sealing part, which helps to ensure the sealing effect. Furthermore, by providing a preset gap between the outer insulating component and the positive electrode post, the installation space communicates with the outside through this preset gap. Simultaneously, a connecting channel is provided on the inner insulating component, connecting the interior of the housing with the installation space. When the sealing part is missing, gas can be transferred to the installation space through the connecting channel, and then to the outside through the preset gap, thus being detected during helium detection. This solves the problem in the prior art where missing sealing parts cannot be detected by helium detection.

[0024] The connecting channel includes lower and upper grooves on opposite sides of the inner insulating component, and a through hole connecting the two. This makes the connecting channel structure relatively simple, easy to process and manufacture, and at the same time, it can make good use of the space of the inner insulating component, which helps to ensure the compactness of the housing assembly structure. Moreover, this connecting channel structure ensures the communication function without negatively affecting the stability of the insulating component and the entire housing assembly.

[0025] Extending the upper groove radially along the inner side of the inner insulating component brings it closer to the positive electrode post, shortening the gas transmission path from the inside of the housing to the installation space. This improves detection sensitivity and facilitates the timely detection of issues such as missing seals. Furthermore, arranging multiple lower grooves circumferentially spaced along the inner insulating component, with corresponding upper grooves, increases the inlet area for gas to enter the installation space, enabling simultaneous multi-point gas intake. This not only accelerates gas filling but also ensures more uniform gas distribution within the installation space, improving the efficiency and accuracy of sealing tests.

[0026] The connecting channel includes a first groove at the bottom of the inner insulating member, a second groove at the top of the inner insulating member, and a through hole connecting the first groove and the second groove, making the connecting channel structure relatively simple and easy to process and manufacture.

[0027] The inner insulating component is arranged in a ring around the positive electrode post. The second groove extends radially outward by a predetermined length and is connected to the inside of the housing through a vent gap. This increases the contact area between the inside of the housing and the second groove, allowing gas inside the housing to be transferred to the second groove more efficiently. The gas is then transferred to the installation space through the through hole and the first groove, and finally to the outside through the predetermined gap between the outer insulating component and the positive electrode post. During helium testing, sealing problems caused by missing seals can be detected more sensitively, improving the accuracy of the test and avoiding adverse phenomena such as leakage due to seal failure.

[0028] By setting the length to be greater than the radius of the outer insulating component, and by making the outer side of the second groove protrude outward relative to the outer insulating component, it is possible to effectively ensure that the gas inside the housing enters the second groove and the installation space, thereby improving the accuracy of detecting leaks in the sealing part.

[0029] By positioning the outer insulating component, the housing, 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, the sealing gasket can tightly fit the positive electrode post and the housing, effectively filling the gap between them and preventing external moisture, dust, and other impurities from entering the battery. At the same time, it prevents internal electrolyte leakage, thereby improving sealing performance and reducing the risk of battery failure caused by sealing failure.

[0030] By including a main body and a convex ring in the outer insulating component, and providing a radially outwardly protruding limiting protrusion on the top of the positive terminal post, and clamping the main body between the limiting protrusion and the housing body, with the protrusion surrounding the limiting protrusion, not only is the installation of the outer insulating component facilitated, but the insulation effect between the positive terminal post and the housing is also improved. The preset gaps, including a first preset gap between the main body and the bottom of the limiting protrusion, and a second preset gap between the convex ring and the side of the limiting protrusion, effectively ensure that the installation space can communicate with the outside through the preset gaps.

[0031] In addition, another objective of this invention is to provide a cylindrical battery having a housing assembly as described above.

[0032] The cylindrical battery of this invention, with the casing assembly described above, not only provides excellent sealing, effectively preventing electrolyte leakage and avoiding performance degradation or malfunction due to short circuits, corrosion, or other issues, but also facilitates rapid detection of missing or failed seals, thereby reducing product defect rates.

[0033] 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.

[0034] 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

[0035] 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:

[0036] Figure 1 This is an exemplary structural diagram of the housing assembly described in Embodiment 1 of this utility model;

[0037] Figure 2 for Figure 1 A schematic diagram of the structure shown from another perspective;

[0038] Figure 3 for Figure 2 Sectional view of line AA in the middle;

[0039] Figure 4 for Figure 3 Enlarged view of section B;

[0040] Figure 5 for Figure 4 The diagram shows the structure when the sealing gasket is removed.

[0041] Figure 6 This is a schematic diagram of the structure of the pole body according to Embodiment 1 of this utility model;

[0042] Figure 7 This is a schematic diagram of the riveting block according to Embodiment 1 of this utility model;

[0043] Figure 8 This is a schematic diagram of the sealing gasket structure according to Embodiment 1 of this utility model;

[0044] Figure 9 This is a schematic diagram of the structure of the external insulating component described in Embodiment 1 of this utility model;

[0045] Figure 10 This is a schematic diagram of the internal insulating component described in Embodiment 1 of this utility model from a first perspective.

[0046] Figure 11 This is a schematic diagram of the internal insulating component described in Embodiment 1 of this utility model from a second perspective.

[0047] Figure 12 This is a schematic diagram of the internal insulation component described in Embodiment 1 of this utility model from a third-view perspective;

[0048] Figure 13 for Figure 12 A cross-sectional view of the CC line;

[0049] Figure 14 This is a schematic diagram of another exemplary structure of the housing assembly described in Embodiment 2 of this utility model;

[0050] Figure 15 for Figure 14 A schematic diagram of the structure shown from another perspective;

[0051] Figure 16 for Figure 15 Enlarged view of section E in the middle;

[0052] Figure 17 for Figure 16 The diagram shows the structure when the sealing gasket is removed.

[0053] Figure 18 This is a schematic diagram of the internal insulating component described in Embodiment 2 of this utility model from a first perspective.

[0054] Figure 19 This is a schematic diagram of the internal insulating component described in Embodiment 2 of this utility model from a second perspective.

[0055] Figure 20 This is a schematic diagram of the internal insulating component described in Embodiment 2 of this utility model from a third-view perspective;

[0056] Figure 21 for Figure 20 A cross-sectional view of the FF line.

[0057] Explanation of reference numerals in the attached figures:

[0058] 1. Housing; 2. Positive terminal; 3. Outer insulation; 4. Inner insulation; 5. Sealing gasket; K. Installation space;

[0059] 201. Pole post body; 2011. Limiting protrusion; 202. Riveting block; 2021. Mounting groove;

[0060] 301. Main body; 302. Convex ring;

[0061] 401. Upper groove; 402. Through hole; 403. Lower groove; 404. Second groove; 405. Through hole; 406. First groove;

[0062] 501. Part One; 502. Part Two. Detailed Implementation

[0063] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0064] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0065] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are 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, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0066] 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.

[0067] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0068] Example 1

[0069] In existing technologies, helium dioxide detectors cannot effectively detect missing battery seals, leading to frequent defects such as seal failure and terminal leakage during the production and use of cylindrical cells. Therefore, this embodiment proposes a housing assembly capable of detecting missing seals.

[0070] In terms of overall structure, the housing assembly of this embodiment includes a housing 1, a positive electrode post 2 inserted into the housing 1, and an insulating assembly and a sealing part disposed between the positive electrode post 2 and the housing 1. The insulating assembly includes an outer insulating member 3 disposed between the outer side of the housing 1 and the positive electrode post 2, and an inner insulating member 4 disposed between the inner side of the housing 1 and the positive electrode post 2. An installation space K is formed between the insulating assembly, the housing 1, and the positive electrode post 2. The sealing part is disposed within the installation space K and is used to seal the gap between the housing 1 and the positive electrode post 2.

[0071] Furthermore, there is a preset gap between the outer insulating component 3 and the positive terminal 2, and the installation space K is connected to the outside through the preset gap. The inner insulating component 4 is provided with a connecting channel, which connects the inside of the housing 1 with the installation space K.

[0072] In this embodiment, the housing assembly, by including an outer insulating member 3 and an inner insulating member 4 in the insulating component, not only achieves better insulation function but also, together with the housing 1 and the positive electrode post 2, forms an installation space K to house the sealing part, which helps ensure a sealing effect. Furthermore, by providing a preset gap between the outer insulating member 3 and the positive electrode post 2, the installation space K communicates with the outside through this preset gap. Simultaneously, the inner insulating member 4 has a connecting channel that connects the interior of the housing 1 with the installation space K. When the sealing part is missing, gas can be transferred to the installation space K through the connecting channel and then to the outside through the preset gap, thus being detected during helium detection. This solves the problem in the prior art where missing sealing parts cannot be detected by helium detection.

[0073] Based on the above overview, an exemplary structure of the housing assembly in this embodiment is described below. Figures 1 to 5 As shown, the shell 1 is cylindrical in shape and is typically connected to the negative electrode cover during manufacturing, thus carrying the negative electrode. Furthermore, the welded negative electrode cover can specifically form... Figure 1 The housing 1 shown has an end portion at one end of the positive electrode post 2, and it can also form an end portion at the other end of the housing 1.

[0074] 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 surrounding the positive electrode post 2. Meanwhile, the inner insulating member 4 is annularly arranged surrounding the electrode post body 201, and is sandwiched between the riveting block 202 and the housing 1, with a preset gap located between the top of the inner insulating member 4 and the housing 1.

[0075] Here, by setting a rivet block 202 on the positive electrode post 2, the inner insulating component 4 is annularly clamped between the rivet block 202 and the housing 1, facilitating the installation of the inner insulating component 4. The rivet block 202, positioned around the positive electrode post 2, increases the contact area between the positive electrode post 2, the inner insulating component 4, and the housing 1, improving the stability of the inner insulating component 4 and the positive electrode post 2, thereby enhancing the overall structural strength. Furthermore, the preset gap is located between the top of the inner insulating component 4 and the housing 1, facilitating communication between the interior of the housing 1 and the installation space K.

[0076] 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 helps ensure a better seal between the riveting block 202 and one side of the inner insulating component 4.

[0077] 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.

[0078] Combination Figure 4 , Figure 5 and Figure 8 As shown, in a preferred embodiment, the outer insulating member 3, the housing 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 1. Furthermore, the sealing portion specifically abuts against the positive electrode post 2 via the first portion 501.

[0079] This design allows the sealing gasket 5 to fit tightly against the positive electrode post 2 and the casing 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, it 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.

[0080] 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.

[0081] As a preferred embodiment, see [link to previous document]. Figure 4 and Figure 5 As shown, and in Figure 5The diagram illustrates the gas flow path. In this embodiment, the connecting channel includes a lower groove 403 and an upper groove 401 located on two opposite sides of the inner insulating member 4, and a through hole 402 connecting the lower groove 403 and the upper groove 401. The lower groove 403 is located on the side of the inner insulating member 4 facing away from the housing 1 and communicates with the interior of the housing 1, while the upper groove 401 communicates with the mounting space K.

[0082] Here, the connecting channel adopts a combination structure of lower groove 403, through hole 402 and upper groove 401, which is simple in structure and easy to process and manufacture. Moreover, it also facilitates the cleaning and inspection of the inside of the connecting channel, and can effectively ensure the accuracy of the sealing test.

[0083] Among them, combined Figures 10 to 12 As shown, for better insulation, the inner insulating member 4 extends radially towards the side wall of the housing 1 along the positive electrode post 2, and has a gap between it and the side wall of the housing 1. Furthermore, the inner insulating member 4 is held onto the housing 1 only by the rivet block 202 on its inner side. In this case, as a further embodiment, such as... Figure 5 and Figure 10 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 10 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.

[0084] In addition, combined Figure 4 , Figure 5 and Figure 9 As shown, the outer insulating member 3 in this embodiment 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 1, and a protruding ring 302 surrounding the limiting protrusion 2011, the protruding ring 302 protruding towards the side of the main body 301 opposite to the housing 1. The aforementioned preset gaps include a first preset gap L1 between the main body 301 and the bottom of the limiting protrusion 2011, and a second preset gap L2 between the protruding ring 302 and the side of the limiting protrusion 2011.

[0085] 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 sandwiching the main body 301 between the limiting protrusion 2011 and the housing 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 1 is improved. Furthermore, by including a first preset gap L1 between the main body 301 and the bottom of the limiting protrusion 2011, and a second preset gap L2 between the convex ring 302 and the side of the limiting protrusion 2011, the sealing performance is ensured while effectively blocking external impurities and reducing the risk of electrolyte leakage inside the battery. Preferably, the first preset gap L1 and the second preset gap L2 are between 0.01 mm and 0.1 mm. For example, the first preset gap L1 or the second preset gap L2 can be set to 0.01mm, 0.03mm, 0.07mm, 0.1mm or other values.

[0086] As a further embodiment, in the radial direction of the positive electrode post 2, the inner insulating member 4 is closer to the positive electrode post 2 relative to the housing 1, and the upper groove 401 extends radially to the inner side of the inner insulating member 4. This arrangement makes the upper groove 401 closer to the positive electrode post 2, which can shorten the gas transmission path from the inside of the housing 1 to the installation space K, improve the detection sensitivity, and facilitate the timely detection of potential problems such as missing seals.

[0087] In addition, as before Figure 5 As shown, the lower groove 403 extends radially along the inner insulating member 4 to the outer side of the positive electrode post 2. This allows gas inside the housing 1 to communicate with the mounting space K through the lower groove 403, the through hole 402, and the upper groove 401, and then with the outside through a predetermined gap. Furthermore, as another preferred embodiment, multiple lower grooves 403 are spaced circumferentially along the inner insulating member 4, and the upper grooves 401 correspond one-to-one with the lower grooves 403.

[0088] This design increases the inlet area for gas to enter the installation space K from the housing 1, enabling simultaneous gas intake at multiple points. This 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 accuracy of detecting leaks in the sealing part. In a specific embodiment, the upper groove 401 and lower groove 403 are four evenly distributed along the circumference of the outer insulating member 3. It should be noted that the number of lower grooves 403 can be one, five, or other quantities besides four.

[0089] 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 1, effectively preventing electrolyte leakage, but also detects cases of missing seals, thereby reducing the product defect rate.

[0090] Example 2

[0091] 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 inner insulating member 4, 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 406 at the bottom of the inner insulating member 4, a second groove 404 at the top of the inner insulating member 4, and a through hole 405 connecting the first groove 406 and the second groove 404. Furthermore, the first groove 406 communicates with the mounting space K, and the second groove 404 communicates with the interior of the housing 1.

[0092] In this structure, the connecting channel includes a first groove 406, a second groove 404, and a through hole 405 located between them. The structure is simple and easy to manufacture. Moreover, it facilitates cleaning and inspection of the interior of the connecting channel, effectively ensuring the accuracy of the sealing test.

[0093] In addition, such as Figure 17 As shown, the inner insulating member 4 is also annular, surrounding the positive electrode post 2, and the second groove 404 extends radially outward by a predetermined length along the inner insulating member 4. Furthermore, a venting gap L3 is provided between the portion of the inner insulating member 4 located outside the second groove 404 and the housing 1 in the radial direction of the inner insulating member 4, and the second groove 404 communicates with the interior of the housing 1 through the venting gap L3. Preferably, the venting gap L3 is between 0.01mm and 0.1mm. For example, the venting gap L3 can be set to 0.01mm, 0.03mm, 0.07mm, 0.1mm, or other values.

[0094] Here, by extending the second groove 404 radially outward by a predetermined length and connecting it to the inside of the housing 1 through the vent gap L3, the contact area between the inside of the housing 1 and the second groove 404 can be increased. This allows pressure changes and gas inside the housing 1 to be transmitted to the second groove 404 more efficiently, and then to the installation space K through the through hole 405 and the first groove 406. Finally, it can be transmitted to the outside through the predetermined gap between the outer insulating part 3 and the positive electrode post 2. During helium testing, sealing problems caused by missing sealing parts can be detected more sensitively, improving the accuracy of the test and avoiding adverse phenomena such as electrode post leakage due to sealing failure.

[0095] Moreover, by providing a second groove 404 on the inner insulating component 4 and retaining an air gap between the outer part and the housing 1, the overall structure of the inner insulating component 4 is not significantly damaged, and the inner insulating component 4 can still maintain good structural strength and insulation performance.

[0096] Additionally, it should be noted that, as Figure 17 As shown, a portion of the mounting space K is formed by the inner side of the inner insulating member 4 and the positive electrode post 2, meaning that there is a radial gap L4 between the inner insulating member 4 and the positive electrode post 2. Therefore, the internal space of the housing 1 can communicate with the mounting space K through the ventilation gap L3 and the connecting channel. Furthermore, this radial gap L4 is preferably set between 0.01mm and 0.1mm. For example, the radial gap can be set to 0.01mm, 0.03mm, 0.07mm, 0.1mm, or other values.

[0097] At this time, refer to Figure 17 As shown in the diagram, in a further embodiment, the outer insulating member 3 is also an annular ring surrounding the positive electrode post 2, with a predetermined length greater than the radius of the outer insulating member 3. Furthermore, as... Figure 16 As shown, the second groove 404 has an outwardly protruding portion that protrudes outward relative to the outer insulating member 3 along the radial direction of the inner insulating member 4. That is, in the radial direction of the inner insulating member 4, the outer side of the second groove 404 protrudes outward relative to the outer insulating member 3. In this example, by ensuring that the preset length is greater than the radius of the outer insulating member 3 and that the outer side of the second groove 404 protrudes outward relative to the outer insulating member 3, it is possible to effectively ensure that the gas inside the housing 1 enters the second groove 404 and the installation space K, thereby improving the accuracy of detecting leaks in the sealing part.

[0098] The housing assembly in this embodiment also provides a good seal between the positive electrode post 2 and the housing 1, which can effectively prevent electrolyte leakage and detect cases of missing seals, thereby reducing the product defect rate.

[0099] Example 3

[0100] This embodiment relates to a cylindrical battery, which has a housing assembly as described in Embodiment 1 or Embodiment 2.

[0101] The cylindrical battery in this embodiment, with a housing assembly as described in Embodiment 1 or Embodiment 2, not only provides good sealing, effectively preventing electrolyte leakage and avoiding performance degradation or malfunction due to short circuits, corrosion, or other issues, but also facilitates rapid detection of missing or failed sealing gaskets 5, thus reducing product defect rates.

[0102] In addition, this embodiment also relates to a battery pack, which is provided with cylindrical batteries as described above.

[0103] The battery pack of this embodiment has all the beneficial effects of the cylindrical battery mentioned above, which will not be repeated here.

[0104] 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 (1), a positive terminal (2) inserted into the housing (1), and an insulating assembly and a sealing part disposed between the positive terminal (2) and the housing (1); The insulating assembly includes an outer insulating member (3) disposed between the outer side of the housing (1) and the positive electrode post (2), and an inner insulating member (4) disposed between the inner side of the housing (1) and the positive electrode post (2). An installation space (K) is formed between the insulating assembly, the housing (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 (1) and the positive electrode post (2). There is a preset gap between the outer insulating component (3) and the positive terminal (2), and the installation space (K) is connected to the outside through the preset gap. The inner insulating component (4) is provided with a connecting channel, which connects the inside of the housing (1) with the installation space (K).

2. The housing assembly according to claim 1, characterized in that: The connecting channel includes a lower groove (403) and an upper groove (401) located on two opposite sides of the inner insulating member (4), and a through hole (402) connecting the lower groove (403) and the upper groove (401); The lower groove (403) is located on the side of the inner insulating member (4) facing away from the housing (1) and communicates with the interior of the housing (1). The upper groove (401) communicates with the mounting space (K).

3. The housing assembly according to claim 2, characterized in that: In the radial direction of the positive electrode post (2), the inner insulating member (4) is close to the positive electrode post (2) relative to the housing (1), and the upper groove (401) extends radially to the inner side of the inner insulating member (4); and / or, The lower grooves (403) are a plurality of grooves spaced apart along the circumference of the inner insulating member (4), and the upper grooves (401) are provided in a one-to-one correspondence with the lower grooves (403).

4. The housing assembly according to claim 1, characterized in that: The connecting channel includes a first groove (406) at the bottom of the inner insulating member (4), a second groove (404) at the top of the inner insulating member (4), and a through hole (405) connecting the first groove (406) and the second groove (404); The first groove (406) communicates with the mounting space (K), and the second groove (404) communicates with the interior of the housing (1).

5. The housing assembly according to claim 4, characterized in that: The inner insulating member (4) is an annular ring surrounding the positive electrode post (2), and the second groove (404) extends outward along the radial direction of the inner insulating member (4) by a predetermined length; In the radial direction of the inner insulating member (4), a ventilation gap is provided between the portion of the inner insulating member (4) located outside the second groove (404) and the housing (1), and the second groove (404) communicates with the interior of the housing (1) through the ventilation gap.

6. The housing assembly according to claim 5, characterized in that: The outer insulating member (3) is an annular ring surrounding the positive electrode post (2), and the preset length is greater than the radius of the outer insulating member (3); The second groove (404) has an outwardly protruding portion that protrudes outward relative to the outer insulating member (3) along the radial direction of the outer insulating member (3).

7. The housing assembly according to claim 1, characterized in that: In the radial direction of the positive electrode post (2), the outer insulating member (3), the housing (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 (1).

8. The housing assembly according to any one of claims 1 to 7, characterized in that: The top of the positive electrode post (2) has a limiting protrusion (2011) that protrudes outward along its own radial direction. The outer insulating member (3) includes a main body (301) sandwiched between the limiting protrusion (2011) and the housing (1), and a protruding ring (302) arranged around the limiting protrusion (2011). The protruding ring (302) protrudes toward the side of the main body (301) opposite to the housing (1). The preset gap includes a first preset gap between the body (301) and the bottom of the limiting protrusion (2011), and a second preset gap between the protruding ring (302) and the side of the limiting protrusion (2011).

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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