Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery and a battery pack, the single battery comprises a cover plate, a fixing part, a pole, a first insulating part and a second insulating part, the cover plate is provided with a first mounting hole penetrating through the cover plate along a second direction, the pole penetrates through the first mounting hole, and the second direction is provided with a second mounting hole penetrating through the second direction. The fixing piece comprises a fixing body and an assembling boss which are connected in the second direction, the fixing body penetrates through the first mounting hole, the fixing body is arranged around the pole and fixedly connected with the pole, the assembling boss extends in the direction away from the pole in the first direction, and the assembling boss and the cover plate form a limiting groove in the second direction; the first insulating part is partially located in the limiting groove, the second insulating part comprises a first insulating part, the first insulating part is arranged on the side, close to the cover plate, of the assembling boss and located in the limiting groove, and the first insulating part abuts against the position between the first insulating part and the assembling boss in the second direction. And the risk of short circuit between the cover plate and the pole caused by electrolyte immersion can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology

[0002] As battery technology matures, battery cells are widely used in electric vehicles and energy storage, leading to increasingly higher requirements for their performance and safety.

[0003] However, in existing battery cells, electrolyte can easily seep between the cover plate and the terminal, greatly increasing the risk of short circuit between the cover plate and the terminal. Utility Model Content

[0004] This application provides a battery cell and a battery pack that greatly reduces the risk of short circuit between the cover plate and the terminal post due to electrolyte infiltration.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, embodiments of this application provide a battery cell having a first direction and a second direction perpendicular to each other, including:

[0007] The cover plate has a first mounting hole that extends through in a second direction;

[0008] The pole post passes through the first mounting hole;

[0009] The fastener includes a fastening body and a mounting boss connected along a second direction. The fastening body passes through a first mounting hole and is arranged around the pole post and fixedly connected to the pole post. The mounting boss extends along the first direction away from the pole post, and the mounting boss and the cover plate form a limiting groove in the second direction.

[0010] The first insulating element is partially located within the limiting groove; and,

[0011] The second insulating component includes a first insulating portion, which is disposed on the side of the mounting boss near the cover plate and located in the limiting groove. The first insulating portion abuts against the first insulating component and the mounting boss in the second direction.

[0012] The battery cell proposed in the first aspect of this application includes a second insulating member in addition to the first insulating member. The first insulating portion of the second insulating member abuts against the mounting boss of the first insulating member and the fixing member along a second direction. This improves the sealing effect between the first insulating member and the mounting boss by the first insulating portion, reducing the risk of electrolyte entering the gap between the cover plate and the mounting boss from between the first insulating member and the mounting boss. This helps reduce the risk of short circuit between the cover plate and the terminal due to electrolyte infiltration, thereby improving the insulation performance between the cover plate and the terminal.

[0013] Optionally, the first insulating element includes an insulating body located within a limiting groove, and the first insulating portion abuts against the insulating body and the mounting boss along a second direction.

[0014] Optionally, the first insulating element further includes a protrusion that is connected to the insulating body along a first direction and protrudes in a direction away from the cover plate along a second direction;

[0015] The second insulating member also includes a second insulating portion connected to the first insulating portion. The second insulating portion is connected to the outer peripheral surface of the mounting boss. The second insulating portion extends along the second direction and is partially disposed between the protrusion and the mounting boss.

[0016] Optionally, the second insulating member further includes a third insulating portion connected to the second insulating portion. The third insulating portion extends along a first direction and is disposed opposite to and spaced apart from the first insulating portion along a second direction. The third insulating portion is connected to the side of the mounting boss away from the cover plate body.

[0017] Optionally, the battery cell also includes a seal that surrounds the retainer;

[0018] The sealing element includes a first sealing part, which is located in a limiting groove and is spaced apart from the first insulating element along a first direction. The first sealing part abuts against the mounting boss and the cover plate along a second direction.

[0019] Along the second direction, the end of the first insulating part near the fixed body along the first direction abuts against the first sealing part and the mounting boss.

[0020] Optionally, the battery cell also includes a third insulating member, a portion of which is disposed along the second direction on the side of the cover plate away from the mounting boss.

[0021] The seal also includes a second sealing portion, which is connected to the first sealing portion along a second direction, and the end of the second sealing portion away from the first sealing portion abuts against the third insulating member along the second direction.

[0022] Optionally, the third insulating member has an extension that is sandwiched between the fixed body and the cover plate, and the second sealing part abuts against the extension along the second direction.

[0023] Optionally, the battery cell also includes a retaining ring, which is located on the side of the third insulating member away from the cover plate, and the retaining ring is fixedly connected to the retaining body.

[0024] Optionally, the battery cell also includes a fourth insulating member and a housing. The cover plate is connected to the housing, and the fourth insulating member is connected to the side of the cover plate near the housing. Along the second direction, a portion of the fourth insulating member is disposed on the side of the mounting boss away from the cover plate. The fourth insulating member is provided with a positioning hole, and the end of the third insulating part along the first direction is close to the positioning hole.

[0025] Secondly, embodiments of this application provide a battery pack, including the battery cells in the first aspect embodiment.

[0026] The battery pack proposed in the second aspect of this application includes a battery cell, which, in addition to the first insulating member, also has a second insulating member. The first insulating portion of the second insulating member abuts against the first insulating member and the mounting boss along a second direction. This improves the sealing effect between the first insulating member and the mounting boss, reducing the risk of electrolyte entering the cover plate and the terminal post through the gap between the first insulating member and the mounting boss. This helps reduce the risk of short circuits between the cover plate and the terminal post due to electrolyte infiltration, thereby improving the insulation performance between the cover plate and the terminal post. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 A cross-sectional view of a battery cell provided in one embodiment of this application;

[0029] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0030] Figure 3 yes Figure 2 A magnified view of a portion of the image;

[0031] Figure 4 A top view of a battery cell provided in one embodiment of this application;

[0032] Figure 5 A schematic diagram of a fastener provided in one embodiment of this application;

[0033] Figure 6 An assembly perspective view of the fastener and the second insulating member provided in one embodiment of this application;

[0034] Figure 7 A cross-sectional view of the assembly of the fastener and the second insulating member according to an embodiment of this application;

[0035] Figure 8 yes Figure 7 A magnified view of a section at point B in the middle.

[0036] [Explanation of Labels in the Attached Image]

[0037] 1000 cells per battery.

[0038] Cover plate 1; First mounting hole 11;

[0039] Fastener 2; Fastener body 21; Second mounting hole 211; Mounting boss 22;

[0040] pole 3;

[0041] Seal 4; First sealing part 41; Second sealing part 42;

[0042] First insulating component 5; Insulating body 51; Protrusion 52;

[0043] Second insulating component 6; First insulating part 61; First sealing section 611; Second sealing section 612; Second insulating part 62; Third insulating part 63;

[0044] Third insulating component 7; Extension 71;

[0045] Fourth insulating component 8; positioning hole 81;

[0046] Limiting groove 9; fixing ring 10;

[0047] Casing 200; Accommodation space 201;

[0048] Electrode assembly 300;

[0049] First direction X;

[0050] Second direction Z. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0053] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0054] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0057] As battery technology matures, battery cells are widely used in electric vehicles and energy storage, leading to increasingly higher requirements for their performance and safety.

[0058] In related technologies, the terminal post is welded to the fixing component (welding station), and the fixing component and the cover plate are insulated and sealed by the first insulating component (lower plastic). When the battery cell is filled with electrolyte, the electrolyte in the battery cell can easily enter the gap between the cover plate and the fixing component through the gap between the first insulating component (lower plastic) and the fixing component, thereby causing a short circuit between the cover plate and the fixing component, thus increasing the risk of a short circuit between the cover plate and the terminal post.

[0059] Based on this, this application proposes a battery cell 1000, which, in addition to the first insulating member 5, also includes a second insulating member 6. The first insulating portion 61 of the second insulating member 6 abuts against the first insulating member 5 and the mounting boss 22 along the second direction Z. Thus, the first insulating portion 61 improves the sealing effect between the first insulating member 5 and the mounting boss 22, reducing the risk of electrolyte entering the gap between the cover plate 1 and the mounting boss 22 from between the first insulating member 5 and the mounting boss 22. This helps reduce the risk of a short circuit between the cover plate 1 and the terminal post 3 due to electrolyte infiltration, thereby improving the insulation performance between the cover plate 1 and the terminal post 3.

[0060] The following description, with reference to the accompanying drawings, illustrates the battery cell 1000 and battery pack proposed in embodiments of this application.

[0061] like Figures 1-8 As shown, the battery cell 1000 according to the first aspect embodiment of this application has a first direction X and a second direction Z that are perpendicular to each other, and includes: a cover plate 1, a fixing member 2, an electrode post 3, a first insulating member 5 and a second insulating member 6.

[0062] The cover plate 1 has a first mounting hole 11 that penetrates the cover plate 1 along the second direction Z. The pole post 3 passes through the first mounting hole 11. The fixing member 2 includes a fixing body 21 and a mounting boss 22 connected along the second direction Z. The fixing body 21 passes through the first mounting hole 11, surrounds the pole post 3, and is fixedly connected to the pole post 3. The mounting boss 22 extends away from the pole post 3 along the first direction X. The mounting boss 22 and the cover plate 1 form a limiting groove 9 in the second direction Z. The first insulating member 5 is partially located in the limiting groove 9. The second insulating member 6 includes a first insulating part 61. The first insulating part 61 is located on the side of the mounting boss 22 near the cover plate 1 and is located in the limiting groove 9. The first insulating part 61 abuts between the first insulating member 5 and the mounting boss 22 along the second direction Z.

[0063] Specifically, refer to Figures 1-4As shown, the cover plate 1 is provided with two first mounting holes 11 that penetrate the cover plate 1 along the second direction Z. One first mounting hole 11 is reserved for the installation of the positive terminal and its corresponding fastener 2, and the other first mounting hole 11 is reserved for the installation of the negative terminal and its corresponding fastener 2. This application takes the assembly, insulation and sealing of one of the terminals 3 as an example for explanation.

[0064] In some embodiments of this application, the fastener 2 is typically chosen to be a metal part. The fastener 2 is welded to the pole post 3, and the fastener 2 is also fixedly installed on the cover plate 1 by a series of sealing structures. Specifically, the fastener 2 in this application includes a fixing body 21 and a mounting boss 22 connected to each other. The fixing body 21 is constructed as a ring structure, and a through second mounting hole 211 is formed in the middle of the fixing body 21. The mounting boss 22 protrudes outward along the radial direction of the fixing body 21 and surrounds the outer peripheral surface of the fixing body 21 along the circumferential direction of the fixing body 21. Along the second direction Z, the mounting boss 22 is located at one end of the fixing body 21. As an example, such as Figure 2 As shown, the mounting boss 22 is located at the lower end of the fixed body 21. Of course, the mounting boss 22 can also be located at the upper end of the fixed body 21. There is no specific limitation here.

[0065] During the assembly of the fastener 2, the pole post 3 and the cover plate 1, the second mounting hole 211 of the fixing body 21 is first fitted onto the pole post 3 so that the pole post 3 can extend out from the second mounting hole 211. Then, the pole post 3 and the fixing body 21 are fixedly connected by welding. Subsequently, the first mounting hole 11 of the cover plate 1 is fitted onto the fixing body 21 so that the fixing body 21 can extend out from the first mounting hole 11. It is ensured that along the second direction Z, the mounting boss 22 is arranged opposite to and spaced apart from the cover plate 1 so that the mounting boss 22 and the cover plate 1 can form a limiting groove 9 in the second direction Z.

[0066] Furthermore, in order to improve the insulation performance between the cover plate 1 and the fixing member 2, a first insulating member 5 can be pre-installed on the fixing member 2 before the cover plate 1 and the fixing member 2 are assembled. The first insulating member 5 can be constructed as a lower plastic. The first insulating member 5 is assembled with the mounting boss 22. When the cover plate 1 and the fixing member 2 are assembled, it is ensured that part of the first insulating member 5 is located in the limiting groove 9. With this setting, the first insulating member 5 can partially fill the gap between the cover plate 1 and the mounting boss 22, thereby avoiding direct contact between the cover plate 1 and the mounting boss 22 and improving the insulation performance between the cover plate 1 and the fixing member 2.

[0067] However, as Figure 2As shown, after the battery cell 1000 is filled with electrolyte, the electrolyte can easily seep into the gap between the first insulating part 5 and the mounting boss 22 and into the gap between the cover plate 1 and the mounting boss 22. Since the fixing part 2 is fixedly connected to the terminal post 3, it can easily cause a short circuit between the cover plate 1 and the fixing part 2, which in turn causes electrochemical corrosion inside the battery cell 1000, greatly increasing the risk of corrosion and leakage of the battery casing 200.

[0068] Based on this, the battery cell 1000 in this application is further provided with a second insulating member 6 on the basis of the first insulating member 5. The second insulating member 6 can be made of polyester insulating and corrosion-resistant materials such as PP, but is not limited to PP. The second insulating member 6 includes a first insulating part 61, which is installed between the first insulating member 5 and the mounting boss 22 along the second direction Z. For example, during the assembly of the second insulating member 6, part or all of the first insulating part 61 is installed between the first insulating member 5 and the mounting boss 22 along the second direction Z. By providing the first insulating part 61, the gaps that may exist between the first insulating member 5 and the mounting boss 22 can be further sealed, thereby improving the sealing performance between the first insulating member 5 and the mounting boss 22 and reducing the risk of electrolyte entering the limiting groove 9 from between the first insulating member 5 and the mounting boss 22. This greatly reduces the risk of short circuit between the cover plate 1 and the terminal post 3 due to electrolyte infiltration, which is beneficial to improving the insulation performance between the cover plate 1 and the terminal post 3.

[0069] The battery cell 1000 proposed in the first aspect of this application includes a second insulating member 6 in addition to the first insulating member 5. The first insulating portion 61 of the second insulating member 6 abuts against the first insulating member 5 and the mounting boss 22 along the second direction Z. Therefore, the first insulating portion 61 improves the sealing effect between the first insulating member 5 and the mounting boss 22, reducing the risk of electrolyte entering the gap between the cover plate 1 and the mounting boss 22 from between the first insulating member 5 and the mounting boss 22. This helps reduce the risk of short circuit between the cover plate 1 and the terminal post 3 due to electrolyte infiltration, thereby improving the insulation performance between the cover plate 1 and the terminal post 3.

[0070] In some embodiments of this application, such as Figure 2 As shown, the first insulating member 5 includes an insulating body 51, which is located in the limiting groove 9, and the first insulating part 61 abuts against the insulating body 51 and the mounting boss 22 along the second direction Z.

[0071] Specifically, along the second direction of the cover plate 1, the cross-sectional view of one side of the first insulating member 5 has an L-shaped structure. The insulating body 51 of the first insulating member 5 is located in the limiting groove 9, and the first insulating part 61 is installed between the insulating body 51 and the mounting boss 22 along the second direction Z. Furthermore, the insulating body 51 can be installed between the first insulating part 61 and the cover plate 1, thereby achieving the insulating and sealing filling of the cover plate 1 and the mounting boss 22 in the second direction Z through the insulating body 51 and the first insulating part 61, ensuring the insulation and sealing performance between the cover plate 1 and the mounting boss 22.

[0072] In some embodiments of this application, such as Figure 2 and Figure 3 As shown, the first insulating member 5 also includes a protrusion 52, which is connected to the insulating body 51 along the first direction X. The protrusion 52 protrudes in the direction away from the cover plate 1 along the second direction Z. The second insulating member 6 also includes a second insulating part 62 connected to the first insulating part 61. The second insulating part 62 is connected to the outer peripheral surface of the mounting boss 22. The second insulating part 62 extends along the second direction Z and is partially abutted between the protrusion 52 and the mounting boss 22.

[0073] Specifically, the second insulating member 6 also includes a second insulating part 62 connected to the first insulating part 61. Along the first direction X, a portion of the second insulating part 62 is disposed on the outer peripheral surface of the mounting boss 22. Optionally, the portion of the second insulating part 62 and the outer peripheral surface of the mounting boss 22 can abut against each other, that is, a portion of the second insulating part 62 covers the outer peripheral surface of the mounting boss 22. This ensures the insulation filling between the outer peripheral surface of the mounting boss 22 and the cover plate 1, and also ensures the sealing performance between the second insulating member 6 and the outer peripheral surface of the mounting boss 22, reducing the risk of electrolyte seeping into the gap between the cover plate 1 and the mounting boss 22 from the gap between the second insulating part 62 and the outer peripheral surface of the mounting boss 22.

[0074] Furthermore, the first insulating member 5 is also provided with a protrusion 52 connected to the insulating body 51. The protrusion 52 protrudes in the direction away from the cover plate 1 along the second direction Z. A portion of the second insulating part 62 is disposed between the protrusion 52 and the mounting boss 22. Thus, the protrusion 52 is equivalent to further improving the insulation filling between the outer peripheral surfaces of the cover plate 1 and the mounting boss 22 in the first direction X, thereby further ensuring the insulation performance between the cover plate 1 and the mounting boss 22.

[0075] In some embodiments of this application, such as Figure 2 , Figure 3 and Figure 8As shown, the second insulating member 6 also includes a third insulating part 63 connected to the second insulating part 62. The third insulating part 63 extends along the first direction X and is disposed opposite to and spaced apart from the first insulating part 61 along the second direction Z. The third insulating part 63 is connected to the side of the mounting boss 22 away from the cover plate body 1.

[0076] Specifically, such as Figure 2 As shown, along the second direction Z, the mounting boss 22 has a top surface and a bottom surface that are disposed opposite to each other. The top surface is close to the cover plate 1, and the bottom surface is away from the cover plate 1. The first insulating part 61 is abutted against the top surface. Further, the second insulating member 6 also includes a third insulating part 63, which is abutted against the bottom surface. The second insulating part 62 is connected between the first insulating part 61 and the third insulating part 63, and is installed on the outer peripheral surface of the mounting boss 22. That is, at least a portion of the second insulating member 6 covers at least a portion of the top surface, the outer peripheral surface of the mounting boss 22, and at least a portion of the bottom surface. Thus, by providing the third insulating part 63 in the second insulating member 6, the mounting boss 22 can be further sealed, further ensuring the sealing performance between the second insulating member 6 and the mounting boss 22. This further reduces the risk of electrolyte seeping into the gap between the cover plate 1 and the mounting boss 22 from the gap between the second insulating member 6 and the mounting boss 22, which is beneficial to further reduce the risk of short circuit between the cover plate 1 and the electrode post 3.

[0077] It should be noted that, as Figures 5-8 As shown, the second insulating member 6 can be constructed as an adhesive layer, which covers at least a portion of the top surface, the outer peripheral surface of the mounting boss 22, and at least a portion of the bottom surface. In addition to meeting the sealing and insulation requirements, the adhesive layer also has advantages such as convenient installation and low cost.

[0078] In some embodiments of this application, such as Figure 2 and Figure 3 As shown, the battery cell also includes a seal 4, which surrounds the fixing member 2. The seal 4 includes a first sealing part 41, which is located in the limiting groove 9. The first sealing part 41 and the first insulating member 5 are spaced apart along the first direction X. The first sealing part 41 abuts against the mounting boss 22 and the cover plate 1 along the second direction Z. Along the second direction Z, the end of the first insulating part 61 near the fixing body 21 along the first direction X abuts against the first sealing part 41 and the mounting boss 22.

[0079] Specifically, seal 4 can be constructed as a sealing ring, such as... Figure 3As shown, the sealing element 4 surrounds the fixing element 2. For example, the sealing element 4 is sleeved on the outer peripheral surface of the fixing body 21. The sealing element 4 includes a first sealing part 41, which is disposed in the limiting groove 9. The first sealing part 41 abuts against the mounting boss 22 and the cover plate 1 along the second direction Z. In this way, the first sealing part 41 can seal the space between the mounting boss 22 and the cover plate 1. However, in order to facilitate the assembly of the sealing element 4 and the first insulating element 5, the first sealing part 41 and the first insulating element 5 are usually spaced apart along the first direction X to leave a gap. Therefore, when the battery cell 1000 is filled with electrolyte, the electrolyte can easily seep into the gap between the first sealing part 41 and the first insulating element 5 through the gap between the first insulating element 5 and the mounting boss 22, which may also lead to a short circuit between the cover plate 1 and the terminal post 3.

[0080] Based on this, along the second direction Z, the end of the first insulating part 61 near the fixed body 21 along the first direction X abuts against the first sealing part 41 and the mounting boss 22. Specifically, the first insulating part 61 includes a connected first sealing section 611 and a second sealing section 612. During the assembly process of the sealing member 4, the first insulating member 5, the second insulating member 6 with the cover plate 1 and the mounting boss 22, along the second direction Z, a portion of the first sealing section 611 of the first insulating part 61 abuts against the insulating body 51 of the first insulating member 5 and the mounting boss 22, and the second sealing section 612 of the first insulating part 61... 2. The first insulating part 61 is installed between the first sealing part 41 and the mounting boss 22, that is, the first insulating part 61 passes through the gap between the first sealing part 41 and the first insulating member 5, and the second sealing section 612 abuts against the gap between the first sealing part 41 and the mounting boss 22 along the second direction Z. With this arrangement, even if some electrolyte seeps into the gap between the second insulating member 6 and the mounting boss 22, the sealing member 4 presses against the first insulating part 61, which helps to further reduce the risk of electrolyte seeping into the gap between the first sealing part 41 and the first insulating member 5, thereby further reducing the risk of short circuit between the cover plate 1 and the electrode post 3.

[0081] In some embodiments of this application, such as Figure 2 and Figure 3As shown, the battery cell 1000 also includes a third insulating member 7. A portion of the third insulating member 7 is disposed along the second direction Z on the side of the cover plate 1 opposite to the mounting boss 22. The sealing member 4 also includes a second sealing portion 42, which is connected to the first sealing portion 41 along the second direction Z. The end of the second sealing portion 42 opposite to the first sealing portion 41 abuts against the third insulating member 7 along the second direction Z. It can be understood that the diameter of the first mounting hole 11 is larger than the diameter of the fixing body 21, that is, there is a certain gap between the fixing body 21 and the first mounting hole 11. Further, the second sealing portion 42 of the sealing member 4 is connected to the first sealing portion 41 along the second direction Z. A portion of the second sealing portion 42 is disposed within the gap between the fixing body 21 and the first mounting hole 11, and the end of the second sealing portion 42 opposite to the first sealing portion 41 abuts against the third insulating member 7 along the second direction Z. This arrangement ensures the insulation performance of the cover plate 1 and the mounting boss 22 in the first direction X.

[0082] In some embodiments of this application, such as Figure 2 As shown, the third insulating member 7 has an extension 71, which is sandwiched between the fixed body 21 and the cover plate 1. Along the second direction Z, the second sealing part 42 abuts against the extension 71.

[0083] Specifically, the extension 71 of the third insulating member 7 is sandwiched between the outer peripheral surface of the fixing body 21 and the hole wall of the first mounting hole 11 of the cover plate 1. The third insulating member 7 is equivalent to achieving insulation filling between the cover plate 1 and the outer peripheral surface of the fixing body 21 in the first direction X.

[0084] Meanwhile, part of the second sealing part 42 can abut against the outer peripheral surface of the fixed body 21 and the hole wall of the first mounting hole 11. The second sealing part 42 is equivalent to achieving insulation filling between the outer peripheral surface of the fixed body 21 and the hole wall of the first mounting hole 11 in the first direction X, thereby further ensuring the insulation performance between the cover plate 1 and the fixing member 2, which is beneficial to improving the insulation performance between the cover plate 1 and the pole post 3.

[0085] Furthermore, during the installation of the third insulating component 7, the second sealing portion 42 of the sealing component 4 is ensured to abut against the extension portion 71 of the third insulating component 7 along the second direction Z. With this arrangement, the gap between the outer peripheral surface of the fixing body 21 and the hole wall of the first mounting hole 11 can be sealed by the second sealing portion 42 and the extension portion 71. This ensures the insulation filling between the outer peripheral surface of the fixing body 21 and the first mounting hole 11, and also ensures the sealing performance between the fixing body 21 and the first mounting hole 11. This reduces the risk of electrolyte seeping into the gap between the cover plate 1 and the fixing body 21, and helps to further reduce the risk of short circuit between the cover plate 1 and the pole post 3.

[0086] In some embodiments of this application, such as Figure 2 As shown, the battery cell 1000 also includes a fixing ring 10, which is located on the side of the third insulating member 7 away from the cover plate 1, and the fixing ring 10 is fixedly connected to the fixing body 21.

[0087] Specifically, the fixing ring 10 is arranged around the fixing body 21 and fixedly installed on the outer circumferential surface of the fixing body 21, and the third insulating member 7 is arranged around the fixing body 21 and sleeved on the outer circumferential surface of the fixing ring 10, along the second direction Z, such as... Figure 2 As shown, part of the third insulating element 7 is located below the fixing ring 10. The fixing ring 10 is used to fix the third insulating element 7. In this way, the third insulating element 7, the cover plate 1 and the fixing element 2 can be fixedly connected in sequence by the fixing ring 10.

[0088] In some embodiments of this application, the battery cell 1000 further includes a fourth insulating member 8 and a housing 200. The cover plate 1 is connected to the housing 200. The fourth insulating member 8 is connected to the side of the cover plate 1 near the housing 200 and along the second direction Z. A portion of the fourth insulating member 8 is disposed on the side of the mounting boss 22 away from the cover plate 1. The fourth insulating member 8 is provided with a positioning hole 81. The end of the third insulating part 63 along the first direction X is close to the positioning hole 81.

[0089] Specifically, the battery cell 1000 also includes an electrode assembly 300, the housing 200 has a communicating opening and a receiving space 201, the electrode assembly 300 is disposed in the receiving space 201 and fixedly connected to the electrode post 3, and the cover plate 1 is fixedly connected to the housing 200 and used to seal the opening.

[0090] Furthermore, the battery cell 1000 also includes a fourth insulating member 8, which is connected to the side of the cover plate 1 near the housing 200 and is located along the second direction Z. A portion of the fourth insulating member 8 is disposed on the side of the mounting boss 22 away from the cover plate 1. For example, the fourth insulating member 8 can be disposed in the opening of the housing 200 and between the cover plate 1 and the electrode assembly 300. In this way, the insulation performance between the cover plate 1 and the electrode assembly 300 can be improved by the fourth insulating member 8. Furthermore, the fourth insulating member 8 has a positioning hole 81, which is disposed opposite to the electrode post 3. This arrangement ensures that the electrode tab of the electrode assembly 300 can pass through the positioning hole 81 and be electrically connected to the electrode post 3. At the same time, the end of the third insulating part 63 along the first direction X is close to the positioning hole 81, thereby ensuring the extension length of the third insulating part 63 along the first direction X. When the lower surface of the third insulating part 63 abuts against the upper surface of the fourth insulating member 8, the sealing performance between the second insulating member 6 and the fourth insulating member 8 can be improved.

[0091] Secondly, embodiments of this application provide a battery pack, including the battery cell 1000 in the first aspect embodiment.

[0092] The battery pack proposed in the second aspect of this application includes a battery cell 1000 as described above. This battery cell 1000, in addition to the first insulating member 5, also includes a second insulating member 6. The first insulating portion 61 of the second insulating member 6 abuts against the first insulating member 5 and the mounting boss 22 along the second direction Z. Therefore, the first insulating portion 61 improves the sealing effect between the first insulating member 5 and the mounting boss 22, reducing the risk of electrolyte entering the gap between the cover plate 1 and the mounting boss 22 from between the first insulating member 5 and the mounting boss 22. This helps reduce the risk of a short circuit between the cover plate 1 and the terminal post 3 due to electrolyte infiltration, thereby improving the insulation performance between the cover plate 1 and the terminal post 3.

[0093] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0094] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0095] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0096] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell having a first direction (X) and a second direction (Z) perpendicular to each other, characterized in that, include: The cover plate (1) is provided with a first mounting hole (11) extending through the second direction (Z); The pole post (3) is inserted through the first mounting hole (11); The fastener (2) includes a fastening body (21) connected along the second direction (Z) and a mounting boss (22). The fastening body (21) passes through the first mounting hole (11). The fastening body (21) is arranged around the pole post (3) and is fixedly connected to the pole post (3). The mounting boss (22) extends along the first direction (X) in a direction away from the pole post (3). The mounting boss (22) and the cover plate (1) form a limiting groove (9) in the second direction (Z). The first insulating element (5) is partially located within the limiting groove (9); and, The second insulating member (6) includes a first insulating part (61), which is disposed on the side of the mounting boss (22) near the cover plate (1) and located in the limiting groove (9). The first insulating part (61) abuts against the first insulating member (5) and the mounting boss (22) along the second direction (Z).

2. The battery cell according to claim 1, characterized in that, The first insulating member (5) includes an insulating body (51) located in the limiting groove (9), and the first insulating part (61) abuts against the insulating body (51) and the mounting boss (22) along the second direction (Z).

3. The battery cell according to claim 2, characterized in that, The first insulating member (5) further includes a protrusion (52), which is connected to the insulating body (51) along the first direction (X) and protrudes in the direction away from the cover plate (1) along the second direction (Z); The second insulating member (6) further includes a second insulating part (62) connected to the first insulating part (61). The second insulating part (62) is connected to the outer peripheral surface of the mounting boss (22). The second insulating part (62) extends along the second direction (Z) and is partially abutted between the protrusion (52) and the mounting boss (22).

4. The battery cell according to claim 3, characterized in that, The second insulating member (6) further includes a third insulating part (63) connected to the second insulating part (62), the third insulating part (63) extending along the first direction (X), and the third insulating part (63) being connected to the side of the mounting boss (22) away from the cover plate (1).

5. The battery cell according to claim 1, characterized in that, The battery cell also includes a seal (4) that surrounds the fixing member (2); The sealing element (4) includes a first sealing part (41), which is located in the limiting groove (9) and is spaced apart from the first insulating element (5) along the first direction (X). The first sealing part (41) abuts against the mounting boss (22) and the cover plate (1) along the second direction (Z). Along the second direction (Z), the end of the first insulating part (61) near the fixed body (21) along the first direction (X) abuts against the first sealing part (41) and the mounting boss (22).

6. The battery cell according to claim 5, characterized in that, The battery cell (1000) also includes a third insulating member (7), a portion of which is disposed along the second direction (Z) on the side of the cover plate (1) away from the mounting boss (22); The sealing element (4) further includes a second sealing part (42), which is connected to the first sealing part (41) along the second direction (Z), and the end of the second sealing part (42) away from the first sealing part (41) abuts against the third insulating element (7) along the second direction (Z).

7. The battery cell according to claim 6, characterized in that, The third insulating member (7) has an extension (71) sandwiched between the fixing body (21) and the cover plate (1), and the second sealing part (42) abuts against the extension (71) along the second direction (Z).

8. The battery cell according to claim 6, characterized in that, The battery cell (1000) also includes a fixing ring (10), which is located on the side of the third insulating member (7) away from the cover plate (1) and is fixedly connected to the fixing body (21).

9. The battery cell according to claim 4, characterized in that, The battery cell (1000) further includes a fourth insulating member (8) and a housing (200). The cover plate (1) is connected to the housing (200). The fourth insulating member (8) is connected to the cover plate (1) on the side near the housing (200) along the second direction (Z). A portion of the fourth insulating member (8) is disposed on the side of the mounting boss (22) away from the cover plate (1). The fourth insulating member (8) is provided with a positioning hole (81). The end of the third insulating part (63) along the first direction (X) is close to the positioning hole (81).

10. A battery pack, characterized in that, Includes the battery cell (1000) according to claims 1-9.

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