Battery cell, battery pack and electric device

Abstract

The application provides an electric core, a battery pack and an electric device. The electric core comprises a shell, a terminal, an insulating piece and a sealing piece. The terminal is arranged at the shell. The insulating piece is arranged between the terminal and the shell. The insulating piece is used for separating the terminal and the shell. The insulating piece comprises a first insulating piece and a second insulating piece. The first insulating piece and the second insulating piece are arranged at two sides of the shell respectively. The sealing piece is arranged between the terminal and the shell. Along the radial direction of the terminal, the first insulating piece and the sealing piece are sequentially distributed. The sealing piece connects the first insulating piece and the second insulating piece, so as to separate the shell and the terminal. The electric core can effectively prevent the short circuit of the electric core in the thermal runaway.

Description

Technical Field

[0001] This application relates to the field of battery cell structure technology, specifically to battery cells, battery packs, and electrical equipment. Background Technology

[0002] Battery cells are widely used in energy storage systems, transportation vehicles, and consumer electronics. A battery cell mainly consists of a casing, terminals, and a core.

[0003] The battery cells used in related technologies are prone to short circuits during thermal runaway. Utility Model Content

[0004] Embodiments of this application provide a battery cell, a battery pack, and an electrical device that can improve the technical problem of short circuits easily occurring in battery cells during thermal runaway.

[0005] In a first aspect, embodiments of this application provide a battery cell, comprising:

[0006] case;

[0007] Terminals are located at the housing;

[0008] An insulating element is disposed between the terminal and the housing, the insulating element being used to separate the terminal and the housing, the insulating element including a first insulating element and a second insulating element, the first insulating element and the second insulating element being respectively disposed on both sides of the housing;

[0009] A sealing element is disposed between the terminal and the housing. Along the radial direction of the terminal, the first insulating element and the sealing element are distributed sequentially. The sealing element connects the first insulating element and the second insulating element to separate the housing and the terminal.

[0010] In one embodiment, a first gap is formed between the end of the housing and the terminal, and the seal extends into the first gap.

[0011] By adopting the above technical solution, at least part of the seal extends between the end of the housing and the terminal, so that the seal can separate the end of the housing and the terminal, preventing the housing and the terminal from contacting each other and causing a short circuit in the battery cell.

[0012] In one embodiment, the second insulating member extends into the first gap and is connected to the seal.

[0013] By adopting the above technical solution, at least part of the second insulating member is extended into the first gap 4 and connected to the sealing member, so that the sealing member and the second insulating member cooperate to separate the end of the housing and the terminal, which can effectively prevent the housing and the terminal from contacting each other and causing a short circuit in the battery cell.

[0014] In one embodiment, the terminal includes a pole and a pressure ring, the pressure ring being connected to the pole, and the seal extending to the connection between the pressure ring and the pole.

[0015] By adopting the above technical solution, the sealing element is extended to the connection position between the pressure ring and the pole, so that the sealing element can play a sealing role at the connection between the pole and the pressure ring, thereby improving the sealing performance of the terminal.

[0016] In one embodiment, the seal is interference-fitted with the second insulating member by an interference amount of a. The seal includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence. Along the axial direction of the terminal, the sum of the height of the second connecting portion and the height of the third connecting portion is H, wherein 0.05 ≤ a / H ≤ 0.6.

[0017] If a / H is less than 0.05, it can easily lead to insufficient connection stability and sealing performance between the seal and the second insulator. If a / H is greater than 0.6, it can easily lead to a reduction in the service life of the seal or the second insulator. Therefore, in this embodiment, a / H is set between 0.05 and 0.6.

[0018] In one embodiment, the seal includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence. Along the axial direction of the terminal, the thickness of the second connecting portion is t2, the sum of the height of the second connecting portion and the height of the third connecting portion is H, and the thickness of the housing is T.

[0019] H > t1 + t2; or,

[0020] H < t1 + t2.

[0021] If the contact position of the seal and the second insulator is exactly flush with the inner side of the housing 1, it will easily increase the difficulty of installing and fitting the seal and the second insulator. Therefore, in this embodiment, H > t1 + t2 is set so that the contact position of the seal and the second insulator is spaced apart from the inner side of the housing, which facilitates the installation of the seal and the second insulator.

[0022] If the contact position of the seal and the second insulator is exactly flush with the inner side of the housing, it will easily increase the difficulty of installing and fitting the seal and the second insulator. Therefore, in this embodiment, H < t1 + t2 is set so that the contact position of the seal and the second insulator is spaced apart from the inner side of the housing, which facilitates the installation of the seal and the second insulator.

[0023] In one embodiment, the housing has a central hole, and the connection between the seal and the second insulating member is located within the central hole.

[0024] If the connection between the seal and the second insulator is flush with the inner side of the housing, it will easily increase the difficulty of installing and fitting the seal and the second insulator. Therefore, in this embodiment, the connection between the seal and the second insulator is set in the central hole, so as to be spaced apart from the inner side of the housing, which is conducive to the installation and fitting of the seal and the second insulator.

[0025] In one embodiment, the housing includes a first side and a second side disposed opposite to each other, the connection portion of the seal and the second insulating member is spaced apart from the first side of the housing, and the connection portion of the seal and the second insulating member is spaced apart from the second side of the housing.

[0026] By adopting the above technical solution, the connection between the seal and the second insulating component is designed to be spaced apart from the first side of the housing, so as to avoid the problem of increased installation difficulty caused by the connection between the seal and the second insulating component being flush with the first side.

[0027] In one embodiment, the housing includes a first side and a second side disposed opposite to each other, a first insulating member is disposed on the first side of the housing, a second insulating member is disposed on the second side of the housing, a first end of a sealing member extends along the first side and is connected to the first insulating member, and a second end of the sealing member extends along the second side and is connected to the second insulating member.

[0028] By adopting the above technical solution, the two ends of the seal extend along the first and second sides of the housing, respectively. This means the seal connects simultaneously to the first side, the second side, and the end of the housing, effectively separating the housing from the terminals. Simultaneously, the first end of the seal connects to the first insulating component, and the second end connects to the second insulating component. The cooperation between the seal and the insulating component effectively separates the housing from the terminals, preventing short circuits in the battery cell.

[0029] In one embodiment, the thickness of the housing is T along the axial direction of the terminal, and the length of the portion of the seal located on the second side along the radial direction of the terminal is L6, wherein 0.05 ≤ L6 / T ≤ 3.

[0030] If L6 / T is less than 0.05, it means that the length of the part of the seal located on the second side of the housing is too short, which may lead to the seal and the second side of the housing having too short a contact distance or even being unable to make contact, thus affecting the sealing effect and the separation effect between the terminal and the housing. If L6 / T is greater than 0.05, it means that the length of the part of the seal located on the second side of the housing is too long, which may affect the setting of the second insulating part and may lead to the overall size of the battery cell being too large. Therefore, in this embodiment, L6 / T is set between 0.05 and 3.

[0031] In one embodiment, the connection surface between the first insulating element and the sealing element is a stepped surface, an inclined surface, or a curved surface; and / or, the connection surface between the second insulating element and the sealing element is a stepped surface, an inclined surface, or a curved surface.

[0032] By adopting the above technical solution, the connection surface of the first insulating component and the sealing component is designed as a stepped surface, a slope, or a curved surface, which helps to increase the creepage clearance between the terminal and the housing, so as to ensure the insulation performance of the battery cell.

[0033] Secondly, embodiments of this application provide a battery pack including the aforementioned battery cells.

[0034] Thirdly, embodiments of this application provide an electrical device including the battery pack described above.

[0035] The beneficial effects of the embodiments of this application are as follows:

[0036] In the embodiments of this application, the insulating member can separate the terminal and the housing to prevent the terminal and the housing from contacting each other and causing a short circuit in the battery cell. At the same time, the sealing member connects the first insulating member and the second insulating member, so that the sealing member can also separate the terminal and the housing, or the sealing member and part of the insulating member cooperate to separate the terminal and the housing, so as to avoid the terminal and the housing from contacting each other and causing a short circuit in the battery cell. That is to say, this application provides both insulating member and sealing member to separate the housing and the terminal, which can effectively prevent the terminal and the housing from short-circuiting.

[0037] Furthermore, the first insulating element and the sealing element are distributed sequentially along the radial direction of the terminal. Thus, the first insulating element can separate and protect the sealing element. When the battery cell experiences thermal runaway, the first insulating element can separate the external high temperature from the sealing element, allowing the sealing element to stably separate the housing and the terminal, thereby effectively preventing the battery cell from short-circuiting during thermal runaway. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0040] Figure 2 The embodiments of this application provide for... Figure 1 One of the labeled diagrams;

[0041] Figure 3 The embodiments of this application provide for... Figure 1 The second illustration with annotations;

[0042] Figure 4 Provided for embodiments of this application Figure 1 The third illustration with annotations;

[0043] Figure 5 One of the partial structural schematic diagrams of a battery cell provided for an embodiment of this application;

[0044] Figure 6 Provided for embodiments of this application Figure 5 A diagram illustrating the annotations;

[0045] Figure 7 A second schematic diagram of a partial structure of a battery cell provided for an embodiment of this application;

[0046] Figure 8 Provided for embodiments of this application Figure 7 A diagram with annotations;

[0047] Figure 9 The third schematic diagram of a partial structure of a battery cell provided for an embodiment of this application;

[0048] Figure 10 Provided for embodiments of this application Figure 9 A diagram with annotations;

[0049] Figure 11 Fourth schematic diagram of a partial structure of a battery cell provided for an embodiment of this application;

[0050] Figure 12 Provided for embodiments of this application Figure 11 A diagram illustrating the annotations;

[0051] Figure 13 The fifth schematic diagram of a partial structure of a battery cell provided for an embodiment of this application. Detailed Implementation

[0052] 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 a part of the embodiments of this application, and not all of the 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. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0053] The following is combined Figures 1 to 13 This application describes the battery cell, battery pack, and electrical device.

[0054] According to the embodiments of the first aspect of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 The battery cell includes a housing 1, a terminal 2 and a separator 3. The terminal 2 is located at the housing 1, and the separator 3 is located between the terminal 2 and the housing 1. The separator 3 is used to separate the terminal 2 and the housing 1. The separator 3 includes at least two separators 31 that are arranged radially along the terminal 2.

[0055] According to the battery cell of this application embodiment, the separator assembly 3 can separate the terminal 2 and the housing 1 to prevent the terminal 2 and the housing 1 from contacting each other and causing a short circuit in the battery cell. The separator assembly 3 includes at least two separators 31 radially distributed along the terminal 2, increasing the number of separators 31, so that the separator assembly 3 can effectively prevent the terminal 2 and the housing 1 from short-circuiting. At the same time, when the battery cell experiences thermal runaway, the outer separator 31 can also protect the inner separator 31, separating the inner separator 31 from the high external temperature, so that the structure of the inner separator 31 can remain stable, thereby effectively preventing the battery cell from short-circuiting during thermal runaway.

[0056] In related technologies, battery cells primarily separate the terminals 2 and the housing 1 using an insulating seal 33. When thermal runaway occurs in the battery cell, the insulating seal 33 is prone to melting, leading to a short circuit. This application, however, improves the short-circuit protection by using at least two separators 31 to separate the terminals 2 and the housing 1. Furthermore, the outer separator 31 separates external high temperatures from the inner separator 31, reducing the impact of external high temperatures on the inner separator 31. This allows the inner separator 31 to stably separate the housing 1 and terminals 2 of the battery cell, preventing short circuits.

[0057] It should be noted that the separator 31 can be either a sealing element 33 or an insulating element 32.

[0058] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 At least two separators 31 include:

[0059] An insulating element 32 is disposed between the terminal 2 and the housing 1, and the insulating element 32 is used to separate the terminal 2 and the housing 1.

[0060] A seal 33 is disposed between the terminal 2 and the housing 1, and the seal 33 is used to separate the terminal 2 and the housing 1.

[0061] In other words, at least two separators 31 include an insulating element 32 and a sealing element 33. Both the insulating element 32 and the sealing element 33 can separate the terminal 2 and the housing 1 to prevent short circuit of the battery cell.

[0062] In related technologies, battery cells integrate sealing and insulation functions into a single component, namely the insulating seal 33. Because the insulating seal 33 needs to integrate both insulation and sealing functions, its flame-retardant performance is relatively low. However, in this embodiment, the insulating component 32 and the seal 33 are two different components, which improves the flame-retardant performance of the seal 33. This allows the seal 33 to withstand higher temperatures, making it less prone to melting in the event of thermal runaway. The seal 33 can continuously separate the housing 1 and the terminal 2, making the battery cell less susceptible to short circuits and improving its stability.

[0063] Specifically, the inner side of the seal 33 is connected to the terminal 2, and the insulating member 32 is sleeved on the outer side of the seal 33. That is to say, the seal 33 is placed between the insulating member 32 and the terminal 2, and the insulating member 32 is placed on the outer side of the seal 33. At this time, both the insulating member 32 and the seal 33 can separate the housing 1 and the terminal 2, and the insulating member 32 can also separate and protect the seal 33.

[0064] Specifically, the inner side of the insulating member 32 is connected to the terminal 2, and the sealing member 33 is sleeved on the outer side of the insulating member 32. That is to say, the insulating member 32 is placed between the sealing member 33 and the terminal 2, and the sealing member 33 is placed on the outer side of the insulating member 32. At this time, both the insulating member 32 and the sealing member 33 can separate the housing 1 and the terminal 2, and the sealing member 33 can separate and protect the insulating member 32.

[0065] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 The insulating component 32 includes a first insulating component 321 and a second insulating component 322, which are respectively disposed on both sides of the housing 1.

[0066] To ensure the insulation separation effect, insulating elements 32 need to be provided on both sides of the housing 1. In this embodiment, the insulating elements 32 include at least a first insulating element 321 and a second insulating element 322. The first insulating element 321 is provided on one side of the housing 1, and the second insulating element 322 is provided on the other side of the housing 1. While ensuring the insulation separation effect, the installation convenience of the insulating elements 32 is improved, and the assembly difficulty of the battery cell is reduced.

[0067] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 The sealing element 33 includes a first sealing element 331 and a second sealing element 332. The first end of the first sealing element 331 is connected to the first end of the second sealing element 332. The second ends of the first sealing element 331 and the second sealing element 332 are respectively located on both sides of the housing 1. At least a portion of the first sealing element 331 and / or at least a portion of the second sealing element 332 are located between the end of the housing 1 and the terminal 2 to separate the terminal 2 and the housing 1.

[0068] To ensure a good seal, the seal 33 needs to extend to both sides of the housing 1. In this embodiment, the seal 33 includes at least a first seal 331 and a second seal 332. At least a portion of the first seal 331 is located on one side of the housing 1, and at least a portion of the second seal 332 is located on the other side of the housing 1. This ensures a good seal while improving the ease of installation of the seal 33 and reducing the difficulty of assembling the battery cell. Simultaneously, the first seal 331 and / or the second seal 332 extend between the end of the housing 1 and the terminal 2 to separate the end of the housing 1 and the terminal 2, ensuring effective separation between the housing 1 and the terminal 2.

[0069] In some examples, at least a portion of the first seal 331 is disposed on the same side as the first insulator 321 to facilitate connection between the first seal 331 and the first insulator 321, and at least a portion of the second seal 332 is disposed on the same side as the second insulator 322 to facilitate connection between the second seal 332 and the second insulator 322.

[0070] Specifically, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 Along the axial direction of terminal 2, the thickness of housing 1 is T, and along the radial direction of terminal 2, the length of the contact portion of the first seal 331 and the second seal 332 is L4, wherein 0.2≤L4 / T≤1.5.

[0071] If the length of the contact portion between the first seal 331 and the second seal 332 is less than 0.2 times the thickness of the housing 1, the radial length of the contact portion is too short, and the sealing performance at the connection between the first seal 331 and the second seal 332 is difficult to guarantee. If the length of the contact portion is greater than 1.5 times the thickness of the housing 1, the radial length of the contact portion is too large, meaning the radial dimensions of the first seal 331 and the second seal 332 will be too large, thus affecting the overall size of the battery cell. Therefore, this application sets the radial length of the contact portion between the first seal 331 and the second seal 332 between 0.2 times the thickness of the housing 1 and 1.5 times the thickness of the housing 1, ensuring the connection stability and sealing performance of the first seal 331 and the second seal 332, while reducing the impact on the overall size of the battery cell.

[0072] In some examples, the first seal 331 and the second seal 332 are interference-fitted, with the interference amount being 5% to 60% of the axial height of the inner surface of the first seal 331 and / or the second seal 332.

[0073] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 The diameter of terminal 2 is D, the outer diameter of the first seal 331 is D1, and the outer diameter of the second seal 332 is D2.

[0074] Specifically, D1 = D2. That is, the outer diameter of the first seal 331 is equal to the outer diameter of the second seal 332, which unifies the dimensions of the first seal 331 and the second seal 332, and is beneficial to the production and manufacturing of the seal 33.

[0075] Specifically, D1 = (32%~95.6%)D. If the outer diameter of the first seal 331 is less than 0.32 times the diameter of terminal 2, it means that the outer diameter of the first seal 331 is too small, and the first seal 331 is difficult to achieve an effective sealing effect. If the outer diameter of the first seal 331 is greater than 0.956 times the diameter of terminal 2, it means that the outer diameter of the first seal 331 is too large, and the first seal 331 is likely to have a significant impact on the overall size of the battery cell. Therefore, the outer diameter D1 of the first seal 331 is designed to be equal to (32%~95.6%)D, which ensures the sealing effect while reducing the impact on the overall size of the battery cell.

[0076] Specifically, D2 = (32%~95.6%)D. If the outer diameter of the second seal 332 is less than 0.32 times the diameter of terminal 2, it means that the outer diameter of the second seal 332 is too small, and the second seal 332 is difficult to achieve an effective sealing effect. If the outer diameter of the second seal 332 is greater than 0.956 times the diameter of terminal 2, it means that the outer diameter of the second seal 332 is too large, and the second seal 332 is likely to have a significant impact on the overall size of the battery cell. Therefore, the outer diameter D2 of the second seal 332 is designed to be equal to (32%~95.6%)D, which ensures the sealing effect while reducing the impact on the overall size of the battery cell.

[0077] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 The first insulating member 321 is located on the outside of the housing 1, the second insulating member 322 is located on the inside of the housing 1, the second end of the first sealing member 331 is located on the outside of the housing 1, and the second end of the second sealing member 332 is located on the inside of the housing 1.

[0078] Along the radial direction of terminal 2, the first insulating member 321 includes a first connecting segment 3211, a second connecting segment 3212 and a third connecting segment 3213 connected in sequence; along the radial direction of terminal 2, the first sealing member 331 includes a first connecting portion 3311, a second connecting portion 3312 and a third connecting portion 3313 connected in sequence.

[0079] Along the axial direction of terminal 2, the thickness of the second connecting section 3212 is T2, and the thickness of the second connecting part 3312 is t2.

[0080] Specifically, T2-t2=0, meaning that the thickness of the second connecting section 3212 of the first insulating member 321 is equal to the thickness of the second connecting part 3312 of the first sealing member 331, which helps to reduce the structural complexity of the battery cell.

[0081] Specifically, t2 > 5%T2, meaning that the thickness of the second connecting part 3312 will be at least 0.05 times the thickness of the second connecting segment 3212, ensuring the thickness of the second connecting part 3312 and preventing the thickness of the second connecting part 3312 from being too small, thus ensuring that the first sealing element 331 can achieve an effective sealing effect.

[0082] Specifically, T2 > 5%t2, meaning that the thickness of the second connecting segment 3212 will be at least 0.05 times the thickness of the second connecting part 3312, ensuring the thickness of the second connecting segment 3212 and preventing the thickness of the second connecting segment 3212 from being too small, thus ensuring that the first insulating component 321 can play an effective insulating and separating role.

[0083] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 The first insulating member 321 is located on the outside of the housing 1, the second insulating member 322 is located on the inside of the housing 1, the second end of the first sealing member 331 is located on the outside of the housing 1, and the second end of the second sealing member 332 is located on the inside of the housing 1.

[0084] Along the radial direction of terminal 2, the first insulating member 321 includes a first connecting segment 3211, a second connecting segment 3212, and a third connecting segment 3213 connected in sequence; the second insulating member 322 includes a fourth connecting segment 3221, a fifth connecting segment 3222, and a sixth connecting segment 3223 connected in sequence; the first sealing member 331 includes a first connecting portion 3311, a second connecting portion 3312, and a third connecting portion 3313 connected in sequence; the second sealing member 332 includes a fourth connecting portion 3321, a fifth connecting portion 3322, and a sixth connecting portion 3323 connected in sequence.

[0085] Along the axial direction of terminal 2, the thickness of the first connecting segment 3211 is T1, the thickness of the fourth connecting segment 3221 is T4, the thickness of the second connecting part 3312 is t2, the thickness of the fifth connecting part 3322 is t4, and the thickness of the housing 1 is T.

[0086] Specifically, T1 = T4, meaning that the thickness of the first connecting segment 3211 of the first insulating component 321 is equal to the thickness of the fourth connecting segment 3221 of the second insulating component 322, so that the specifications and dimensions of the first insulating component 321 are similar to or the same as those of the second insulating component 322, which facilitates the production of the insulating component 32.

[0087] Specifically, |T1-T4|=(1%~67%)T. If the absolute value of the difference between the thickness of the first connecting segment 3211 and the thickness of the fourth connecting segment 3221 is greater than 0.67 times the thickness of the shell 1, then the difference between the thickness of the first connecting segment 3211 and the thickness of the fourth connecting segment 3221 is too large, which may easily lead to a large difference in the insulation effect of the first insulating member 321 and the second insulating member 322. Therefore, this application sets the absolute value of the difference between the thickness of the first connecting segment 3211 and the thickness of the fourth connecting segment 3221 between 0.01 times the thickness of the shell 1 and 0.67 times the thickness of the shell 1.

[0088] Specifically, t2 = t4, meaning the thickness of the second connecting portion 3312 of the first sealing element 331 is equal to the thickness of the fifth connecting portion 3322 of the second sealing element 332, so that the specifications and dimensions of the first sealing element 331 are similar to or the same as those of the second sealing element 332, which facilitates the production of the sealing element 33.

[0089] Specifically, |t2-t4|=(1%~67%)T. If the absolute value of the difference between the thickness of the second connecting part 3312 and the thickness of the fifth connecting part 3322 is greater than 0.67 times the thickness of the housing 1, then the difference between the thickness of the second connecting part 3312 and the thickness of the fifth connecting part 3322 is too large, which may easily lead to a large difference in the sealing effect of the first sealing member 331 and the second sealing member 332. Therefore, this application sets the absolute value of the difference between the thickness of the second connecting part 3312 and the thickness of the fifth connecting part 3322 between 0.01 times the thickness of the housing 1 and 0.67 times the thickness of the housing 1.

[0090] In one embodiment of this application, the volume of the first connecting part 3311 is V1, and the sum of the volumes of the second connecting part 3312 and the third connecting part 3313 is V2, wherein V1 = (0.5% to 80%)V2.

[0091] If V1 is less than 0.5% of V2, the creepage clearance between terminal 2 and housing 1 is too small. If V1 is greater than 80% of V2, it will easily have a significant impact on the structure of terminal 2. Therefore, V1 is set to be equal to (0.5% to 80%) V2.

[0092] In one embodiment of this application, the volume of the fourth connecting part 3321 is V3, and the sum of the volumes of the fifth connecting part 3322 and the sixth connecting part 3323 is V4, wherein V3 = (0.5% to 80%)V4.

[0093] If V3 is less than 0.5% of V4, the creepage clearance between terminal 2 and housing 1 is too small. If V3 is greater than 80% of V4, it will easily have a significant impact on the structure of terminal 2. Therefore, V3 is set to be equal to (0.5% to 80%) V4.

[0094] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 The outer diameter of the first insulating component 321 is D3, the outer diameter of the second insulating component 322 is D4, and the diameter of the terminal 2 is D.

[0095] Specifically, |D3-D4| = 1%~58%D, which ensures the creepage distance between terminal 2 and housing 1, and guarantees the insulation performance of the battery cell.

[0096] Specifically, D3 = 1% to 58%D, which ensures the creepage distance between terminal 2 and housing 1, thus ensuring the insulation performance of the battery cell.

[0097] Specifically, D4 = 1% to 58%D, which ensures the creepage distance between terminal 2 and housing 1, thus guaranteeing the insulation performance of the battery cell.

[0098] In one embodiment of this application, along the radial direction of terminal 2, sealing member 33 and insulating member 32 are sequentially distributed in a direction away from the center of terminal 2, insulating member 32 is formed with a first snap-fit ​​groove, and sealing member 33 snaps into the first snap-fit ​​groove.

[0099] By forming a first snap-fit ​​groove at the insulating member 32, the sealing member 33 can be connected to the insulating member 32 by snap-fit, thereby improving the connection stability between the sealing member 33 and the insulating member 32. At the same time, the setting of the first snap-fit ​​groove can also increase the creepage clearance between the terminal 2 and the housing 1, which is beneficial to improving the insulation performance of the battery cell.

[0100] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 The outer diameter of the seal 33 is D1, and the inner diameter of the insulator 32 is D5; along the radial direction of the terminal 2, the length of the contact portion between the insulator 32 and the housing 1 is d1, and the length of the snap-fit ​​position between the seal 33 and the insulator 32 is L.

[0101] Specifically, the minimum length Lmin of the snap-fit ​​position of the seal 33 and the insulator 32 is greater than or equal to D1-D5, which ensures the length of the snap-fit ​​between the seal 33 and the insulator 32 and ensures the snap-fit ​​stability of the seal 33 and the insulator 32.

[0102] Specifically, the maximum length Lmax of the snap-fit ​​position between the seal 33 and the insulator 32 is ≤99%D5, which can avoid the excessive length of the snap-fit ​​between the seal 33 and the insulator 32 and avoid causing a significant impact on the size of the battery cell.

[0103] Specifically, the maximum length Lmax of the snap-fit ​​position between the seal 33 and the insulator 32 is ≤95%d1, which can avoid the excessive length of the snap-fit ​​between the seal 33 and the insulator 32 and avoid causing a significant impact on the size of the battery cell.

[0104] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 Along the axial direction of terminal 2, the length of the contact portion between the seal 33 and the end of housing 1 is h; housing 1 includes a first side 11 and a second side 12 disposed opposite to each other; along the radial direction of terminal 2, the length of the contact portion between the seal 33 and the first side 11 of housing 1 is L1, and the length of the contact portion between the seal 33 and the second side 12 of housing 1 is L2; ​​the outer diameter of terminal 2 is D, and L1+L2+h=(3%~79%)D.

[0105] The sum of L1+L2+h is the total length of the contact between the seal 33 and the housing 1. When the total length is less than 3%D, it means that the contact length between the seal 33 and the housing 1 is too short and it is difficult to guarantee the sealing effect. When the total length is greater than 79%D, it means that the contact length between the seal 33 and the housing 1 is too long and it is easy to affect the setting of the insulating component 32 or the size of the battery cell. Therefore, in this embodiment, the total length of the contact between the seal 33 and the housing 1 is set to be equal to (3%~79%)D.

[0106] In one embodiment of this application, the area of ​​the contact portion between the seal 33 and the housing 1 is S, the housing 1 is formed with a mounting cavity, and the area of ​​the side of the terminal 2 away from the mounting cavity is s, wherein S = (3.4% to 80%)s.

[0107] If S is less than 3.4%s, it means that the contact area between the seal 33 and the housing 1 is too small, making it difficult to guarantee the sealing effect. If S is greater than 80%s, it means that the contact area between the seal 33 and the housing 1 is too large, which may affect the setting of the insulating component 32 or the size of the battery cell. Therefore, in this embodiment, the area S of the contact part between the seal 33 and the housing 1 is set to be equal to (3.4%~80%)s.

[0108] In one embodiment of this application, the compression ratio of the contact portion between the seal 33 and the housing 1 is R, where 5% ≤ R ≤ 70%. If the compression ratio of the contact portion between the seal 33 and the housing 1 is less than 5%, the sealing effect will be easily affected. If the compression ratio of the contact portion between the seal 33 and the housing 1 is greater than 70%, the service life of the seal 33 will be easily affected. Therefore, in this embodiment, the compression ratio of the contact portion between the seal 33 and the housing 1 is set between 5% and 70%.

[0109] In one embodiment of this application, the compression ratio of the insulating element 32 is r, where 1% ≤ r ≤ 50%. If the compression ratio of the insulating element 32 is less than 1%, the insulation effect will be easily affected. If the compression ratio of the insulating element 32 is greater than 50%, the service life of the insulating element 32 will be easily affected. Therefore, in this embodiment, the compression ratio of the insulating element 32 is set between 1% and 50%.

[0110] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 Terminal 2 includes a pole post 21 and a pressure ring 22. The pressure ring 22 is connected to the pole post 21. The pole post 21 has a second snap-fit ​​groove 211. The seal 33 is snapped into the second snap-fit ​​groove 211.

[0111] By forming a second snap-fit ​​groove 211 on the electrode post 21, the sealing element 33 is connected to the electrode post 21 by snap-fit, ensuring the connection stability between the sealing element 33 and the electrode post 21. At the same time, the setting of the second snap-fit ​​groove 211 can also increase the creepage clearance between the electrode post 21 and the housing 1, thereby improving the insulation performance of the battery cell.

[0112] Specifically, along the axial direction of the pole post 21, the groove depth of the second snap-fit ​​groove 211 is h1; the pole post 21 includes a first part 212, a second part 213 and a third part 214 connected in sequence, the first part 212 and the second part 213 surround to form the second snap-fit ​​groove 211, and along the axial direction of the pole post 21, the thickness of the second part 213 is T5, wherein 3% ≤ h1 / T5 ≤ 82%.

[0113] If h1 / T5 is less than 3%, it means that the groove depth of the second snap-fit ​​groove 211 is too small, which is not conducive to the material flow of the seal 33 and makes it difficult to ensure the connection stability between the seal 33 and the pole post 21. If h1 / T5 is greater than 82%, it means that the groove depth of the second snap-fit ​​groove 211 is too large, which can easily lead to a reduction in the structural strength of the pole post 21. Therefore, in this embodiment, the ratio of the groove depth of the second snap-fit ​​groove 211 to the thickness of the second part 213 is set between 3% and 82%.

[0114] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 Terminal 2 includes a pole post 21 and a pressure ring 22. The pressure ring 22 is connected to the pole post 21. The pressure ring 22 forms a fourth snap-fit ​​groove 221. The seal 33 is snapped into the fourth snap-fit ​​groove 221.

[0115] By forming a fourth snap-fit ​​groove 221 on the pressure ring 22, the seal 33 can be connected to the pressure ring 22 by snap-fit, ensuring the connection stability between the seal 33 and the pressure ring 22. At the same time, the design of the fourth snap-fit ​​groove 221 can also increase the creepage clearance between the pressure ring 22 and the housing 1, which is beneficial to improving the insulation performance of the battery cell.

[0116] Specifically, along the axial direction of the pole post 21, the groove depth of the fourth locking groove 221 is h2; the pressure ring 22 includes a first section 222, a second section 223 and a third section 224 connected in sequence. The first section 222 and the second section 223 form the fourth locking groove 221. Along the axial direction of the pole post 21, the thickness of the second section 223 is T6, wherein 1% ≤ h2 / T6 ≤ 86%.

[0117] If h2 / T6 is less than 1%, it indicates that the groove depth of the fourth retaining groove 221 is too small, which is not conducive to the material flow of the seal 33 and makes it difficult to ensure the connection stability between the seal 33 and the pressure ring 22. If h2 / T6 is greater than 86%, it indicates that the groove depth of the fourth retaining groove 221 is too large, which can easily lead to a reduction in the structural strength of the pressure ring 22. Therefore, in this embodiment, the ratio of the groove depth of the fourth retaining groove 221 to the thickness of the second segment 223 is set between 1% and 86%.

[0118] Specifically, the width of the second slot 211 is W1, the width of the fourth slot 221 is W2, and the outer diameter of the terminal 2 is D, wherein 0.6%D≤W1 / W2≤73%D.

[0119] If W1 / W2 is less than 0.6%D, it indicates that the width of the second snap-fit ​​groove 211 is too short, which may affect the connection and fit between the seal 33 and the pole post 21, as well as the connection and fit between the insulator 32 and the pole post 21. If W1 / W2 is greater than 73%D, it indicates that the width of the second snap-fit ​​groove 211 is too long, which may lead to the pole post 21 being too large. Therefore, in this embodiment, the ratio of the width of the second snap-fit ​​groove 211 to the width of the fourth snap-fit ​​groove 221 is set between 0.6%D and 73%D.

[0120] Specifically, 0.65 ≤ T5 / T6 ≤ 4.5. If T5 / T6 is less than 0.65, it means that the thickness of the pole 21 is too small, and the pole 21 is difficult to meet the minimum welding thickness requirement. If T5 / T6 is greater than 4.5, it will easily have a significant impact on the overall size of the terminal 2, making the size of the terminal 2 too large. Therefore, in this embodiment, T5 / T6 is set between 0.65 and 4.5.

[0121] Specifically, 0.65 ≤ T6 / T5 ≤ 4.5. If T6 / T5 is less than 0.65, it means that the thickness of the pressure ring 22 is too small, and the pressure ring 22 is difficult to meet the minimum welding thickness requirement. If T6 / T5 is greater than 4.5, it will easily have a significant impact on the overall size of the terminal 2, making the size of the terminal 2 too large. Therefore, in this embodiment, T6 / T5 is set between 0.65 and 4.5.

[0122] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 Terminal 2 includes a pole post 21 and a pressure ring 22. The pressure ring 22 is connected to the pole post 21. The diameter of terminal 2 is D, and the diameter of pressure ring 22 is D6.

[0123] Specifically, 0.5≤D / D6≤8 is used to ensure the stability of the fit between the terminal post 21 and the pressure ring 22, as well as the overall strength of the battery cell.

[0124] Specifically, 0.5≤D6 / D≤8 is required to ensure the stability of the fit between the terminal post 21 and the pressure ring 22, as well as the overall strength of the battery cell.

[0125] In one embodiment of this application, the length of the seal 33 along the radial direction of the terminal 2 is L3, and the diameter of the terminal 2 is D, wherein 1% ≤ L3 / D ≤ 56%.

[0126] If L3 / D is less than 1%, it means that the length of the seal 33 is too short and it is difficult to guarantee the sealing effect. If L3 / D is greater than 56%, it means that the length of the seal 33 is too long and it is easy to affect the installation of the insulator 32 or the overall size of the battery cell. Therefore, in this embodiment, L3 / D is set between 1% and 56%.

[0127] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 Terminal 2 includes a pole post 21 and a pressure ring 22. The pole post 21 includes a body 215 and a riveting part 216. The riveting part 216 is riveted to the pressure ring 22. The volume of the body 215 is V5 and the volume of the riveting part 216 is V6, wherein 1% ≤ V6 / V5 ≤ 45%.

[0128] If V6 / V5 is less than 1%, it is easy to cause insufficient connection strength between the pole post 21 and the pressure ring 22. If V6 / V5 is greater than 45%, it is easy to cause the volume of the riveting part 216 to be too large, which in turn causes the volume of the pole post 21 to be too large, affecting the overall size of the cell. Therefore, in this embodiment, V6 / V5 is set between 1% and 45%.

[0129] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 The shell 1 has a central hole with a diameter of d2 and a diameter of d3, wherein 5% ≤ d2 / d3 ≤ 55%.

[0130] If d2 / d3 is less than 5%, the size of terminal 2 will be too small, affecting the current carrying capacity of terminal 2. If d2 / d3 is greater than 55%, the structural stability of housing 1 will be reduced. Therefore, in this embodiment, d2 / d3 is set between 5% and 55%.

[0131] In one embodiment of this application, two adjacent separators 31 are snap-fitted together, which helps to improve the connection stability of the two adjacent separators 31.

[0132] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 Terminal 2 includes a pole post 21 and a pressure ring 22, the pressure ring 22 is connected to the pole post 21, and at least two separators 31 include a first separator 311 and a second separator 312, the second separator 312 being located between the center of the pole post 21 and the first separator 31.

[0133] Specifically, the second separator 312 has a third locking groove, and the pole post 21 is locked into the third locking groove to improve the connection stability between the second separator 312 and the pole post 21. The design of the third locking groove also helps to increase the creepage clearance between the pole post 21 and the housing 1.

[0134] Specifically, the second partition 312 has a fifth snap-fit ​​groove, and the pressure ring 22 snaps into the fifth snap-fit ​​groove to improve the connection stability between the second partition 312 and the pressure ring 22. The design of the fifth snap-fit ​​groove is also conducive to increasing the creepage clearance between the pressure ring 22 and the housing 1.

[0135] In some examples, the first separator 311 is, for example, an insulating element 32, and the second separator 312 is, for example, a sealing element 33.

[0136] In one embodiment of this application, the relationship between the number n of the sealing elements 33 and the sealing point f is f≥n+1, so as to ensure the sealing effect.

[0137] In one embodiment of this application, the R angle of the pole post 21 is 0.1 to 10 times the thickness of the housing 1 to reduce the stress on the pole post 21.

[0138] In one embodiment of this application, the radius (R) of the central hole of the housing 1 is 0.1 to 10 times the thickness of the housing 1, so as to reduce the stress at the central hole of the housing 1.

[0139] In some embodiments, such as Figure 5 , Figure 6 , Figure 7 and Figure 8 The battery cell includes a housing 1, terminals 2, an insulator 32, and a seal 33. Terminals 2 are located at the housing 1. The insulator 32 is located between the terminals 2 and the housing 1 and is used to separate the terminals 2 and the housing 1. The insulator 32 includes a first insulator 321 and a second insulator 322. The first insulator 321 and the second insulator 322 are respectively located on both sides of the housing 1. The seal 33 is located between the terminals 2 and the housing 1. The first insulator 321 and the seal 33 are distributed sequentially along the radial direction of the terminals 2. The seal 33 connects the first insulator 321 and the second insulator 322 to separate the housing 1 and the terminals 2.

[0140] According to the embodiment of this application, the insulating member 32 can separate the terminal 2 and the housing 1 to prevent the terminal 2 and the housing 1 from contacting each other and causing a short circuit in the battery cell. At the same time, the sealing member 33 connects the first insulating member 321 and the second insulating member 322, so that the sealing member 33 can also separate the terminal 2 and the housing 1, or the sealing member 33 and part of the insulating member 32 cooperate to separate the terminal 2 and the housing 1, so as to avoid the terminal 2 and the housing 1 from contacting each other and causing a short circuit in the battery cell. That is to say, this application provides both the insulating member 32 and the sealing member 33 to separate the housing 1 and the terminal 2, which can effectively prevent the terminal 2 and the housing 1 from short-circuiting.

[0141] Furthermore, the first insulating element 321 and the sealing element 33 are distributed sequentially along the radial direction of the terminal 2. Thus, the first insulating element 321 can provide separation and protection for the sealing element 33. When the battery cell experiences thermal runaway, the first insulating element 321 can separate the external high temperature from the sealing element 33, allowing the sealing element 33 to stably separate the housing 1 and the terminal 2, thereby effectively preventing the battery cell from short-circuiting during thermal runaway.

[0142] In one embodiment of this application, such as Figure 5 , Figure 6 , Figure 7 and Figure 8 A first gap 4 is formed between the end of the housing 1 and the terminal 2, and the seal 33 extends into the first gap 4.

[0143] At least a portion of the seal 33 extends between the end of the housing 1 and the terminal 2, such that the seal 33 can separate the end of the housing 1 and the terminal 2, preventing the housing 1 and the terminal 2 from contacting each other and causing a short circuit in the battery cell.

[0144] It should be noted that the first gap 4 can be completely filled by the sealing element 33. Alternatively, the sealing element 33 can fill part of the first gap 4, and the second insulating element 322 can fill part of the first gap 4, that is, the first gap 4 can be completely filled by the sealing element 33 and the second insulating element 322.

[0145] Specifically, the second insulating member 322 extends into the first gap 4, and the second insulating member 322 is connected to the sealing member 33.

[0146] At least a portion of the second insulating member 322 extends into the first gap 4 and connects with the seal 33, such that the seal 33 and the second insulating member 322 cooperate to separate the end of the housing 1 and the terminal 2, which can effectively prevent the housing 1 and the terminal 2 from contacting each other and causing a short circuit in the battery cell.

[0147] In one embodiment of this application, such as Figure 5 , Figure 6 , Figure 7 and Figure 8 Terminal 2 includes a pole post 21 and a pressure ring 22, the pressure ring 22 is connected to the pole post 21, and the seal 33 extends to the connection between the pressure ring 22 and the pole post 21.

[0148] The seal 33 is extended to the connection position between the pressure ring 22 and the pole post 21, so that the seal 33 can seal the connection between the pole post 21 and the pressure ring 22, thereby improving the sealing performance of the terminal 2.

[0149] In one embodiment of this application, such as Figure 5 , Figure 6 , Figure 7 and Figure 8 The sealing element 33 is interference-fitted with the second insulating element 322, with an interference amount of a. The sealing element 33 includes a first connecting part 3311, a second connecting part 3312 and a third connecting part 3313 connected in sequence. Along the axial direction of the terminal 2, the sum of the height of the second connecting part 3312 and the height of the third connecting part 3313 is H, where 0.05≤a / H≤0.6.

[0150] If a / H is less than 0.05, it is easy to cause insufficient connection stability and sealing performance between the seal 33 and the second insulator 322. If a / H is greater than 0.6, it is easy to cause a reduction in the service life of the seal 33 or the second insulator 322. Therefore, in this embodiment, a / H is set between 0.05 and 0.6.

[0151] In one embodiment of this application, such as Figure 5 , Figure 6 , Figure 7 and Figure 8 The sealing element 33 includes a first connecting part 3311, a second connecting part 3312 and a third connecting part 3313 connected in sequence. Along the axial direction of the terminal 2, the thickness of the second connecting part 3312 is t2, the sum of the height of the second connecting part 3312 and the height of the third connecting part 3313 is H, and the thickness of the housing 1 is T.

[0152] Specifically, H > t1 + t2. If the contact position of the seal 33 and the second insulator 322 is exactly flush with the inner side of the housing 1, it will easily increase the difficulty of installing and fitting the seal 33 and the second insulator 322. Therefore, in this embodiment, H > t1 + t2, so that the contact position of the seal 33 and the second insulator 322 is spaced apart from the inner side of the housing 1, which facilitates the installation of the seal 33 and the second insulator 322.

[0153] Specifically, H < t1 + t2. If the contact position of the seal 33 and the second insulator 322 is exactly flush with the inner side of the housing 1, it will easily increase the difficulty of installing and fitting the seal 33 and the second insulator 322. Therefore, in this embodiment, H < t1 + t2 is set so that the contact position of the seal 33 and the second insulator 322 is spaced apart from the inner side of the housing 1, which facilitates the installation of the seal 33 and the second insulator 322.

[0154] In one embodiment of this application, the housing 1 has a central hole, and the connection portion between the seal 33 and the second insulating member 322 is located inside the central hole.

[0155] If the connection between the seal 33 and the second insulator 322 is flush with the inner side of the housing 1, it will easily increase the difficulty of installing and fitting the seal 33 and the second insulator 322. Therefore, in this embodiment, the connection between the seal 33 and the second insulator 322 is set in the center hole, so as to be spaced apart from the inner side of the housing 1, which is conducive to the installation and fitting of the seal 33 and the second insulator 322.

[0156] In one embodiment of this application, such as Figure 5 , Figure 6 , Figure 7 and Figure 8 The housing 1 includes a first side 11 and a second side 12 that are disposed opposite to each other. The connection portion of the sealing member 33 and the second insulating member 322 is spaced apart from the first side 11 of the housing 1, and the connection portion of the sealing member 33 and the second insulating member 322 is spaced apart from the second side 12 of the housing 1.

[0157] It is understandable that the connection between the seal 33 and the second insulator 322 is designed to be spaced apart from the first side 11 of the housing 1, so as to avoid the problem of increased installation difficulty caused by the connection between the seal 33 and the second insulator 322 being flush with the first side 11. Similarly, the connection between the seal 33 and the second insulator 322 is designed to be spaced apart from the second side 12 of the housing 1, so as to avoid the problem of increased installation difficulty caused by the connection between the seal 33 and the second insulator 322 being flush with the second side 12.

[0158] In some examples, the connection between the seal 33 and the second insulator 322 can be arranged horizontally or vertically.

[0159] In one embodiment of this application, such as Figure 5 , Figure 6 , Figure 7 and Figure 8 The housing 1 includes a first side 11 and a second side 12 disposed opposite to each other. A first insulating member 321 is disposed on the first side 11 of the housing 1, and a second insulating member 322 is disposed on the second side 12 of the housing 1. A first end of a sealing member 33 extends along the first side 11 and is connected to the first insulating member 321, and a second end of the sealing member 33 extends along the second side 12 and is connected to the second insulating member 322.

[0160] It is understandable that the two ends of the seal 33 extend along the first side 11 and the second side 12 of the housing 1, respectively. That is, the seal 33 connects to the first side 11, the second side 12, and the end of the housing 1 simultaneously, so that the seal 33 can effectively separate the housing 1 and the terminal 2. At the same time, the first end of the seal 33 is connected to the first insulator 321, and the second end of the seal 33 is connected to the second insulator 322. Thus, the seal 33 and the insulator 32 work together to effectively separate the housing 1 and the terminal 2, preventing short circuits in the battery cell.

[0161] Specifically, along the axial direction of terminal 2, the thickness of housing 1 is T, and along the radial direction of terminal 2, the length of the portion of seal 33 located on the second side 12 is L6, where 0.05≤L6 / T≤3.

[0162] If L6 / T is less than 0.05, it means that the length of the part of the seal 33 located on the second side 12 of the housing 1 is too short, which may lead to the seal 33 and the second side 12 of the housing 1 having too short a contact distance or even being unable to contact, thereby affecting the sealing effect and the separation effect between the terminal 2 and the housing 1. If L6 / T is greater than 3, it means that the length of the part of the seal 33 located on the second side 12 of the housing 1 is too long, which may affect the setting of the second insulating member 322 and may lead to the overall size of the battery cell being too large. Therefore, in this embodiment, L6 / T is set between 0.05 and 3.

[0163] In one embodiment of this application, the connection surface between the first insulating member 321 and the sealing member 33 is a stepped surface, an inclined surface, or a curved surface; and / or, the connection surface between the second insulating member 322 and the sealing member 33 is a stepped surface, an inclined surface, or a curved surface.

[0164] Designing the connection surface of the first insulating component 321 and the sealing component 33 as a stepped surface, a slope, or a curved surface is beneficial to increasing the creepage clearance between the terminal 2 and the housing 1, so as to ensure the insulation performance of the battery cell.

[0165] Designing the connection surface of the second insulating component 322 and the sealing component 33 as a stepped surface, inclined surface, or curved surface is beneficial to increasing the creepage clearance between the terminal 2 and the housing 1, so as to ensure the insulation performance of the battery cell.

[0166] In some embodiments, such as Figure 9 and Figure 10 The battery cell includes a housing 1, a terminal 2 and a separator 3. The terminal 2 is located at the housing 1, and the separator 3 is located between the terminal 2 and the housing 1. The separator 3 is used to separate the terminal 2 and the housing 1. The separator 3 includes at least two separators 31 that are sequentially distributed along the radial direction of the terminal 2. Along the axial direction of the terminal 2, two adjacent separators 31 are stacked on top of each other.

[0167] According to the embodiments of this application, the separator assembly 3 can separate the terminal 2 and the housing 1 to prevent short circuits caused by contact between the terminal 2 and the housing 1. The separator assembly 3 includes at least two separators 31 radially distributed along the terminal 2, increasing the number of separators 31 and effectively preventing short circuits between the terminal 2 and the housing 1. Simultaneously, when thermal runaway occurs in the battery cell, the outer separator 31 can also protect the inner separator 31, separating it from the external high temperature, thus maintaining the stability of the inner separator 31's structure and effectively preventing short circuits during thermal runaway. Furthermore, the overlapping of adjacent separators 31 increases the creepage clearance between the terminal 2 and the housing 1, thereby helping to ensure the insulation performance of the battery cell.

[0168] In one embodiment of this application, at least a portion of the first insulating member 321 is stacked on the first sealing member 331 along the axial direction of the terminal 2, which helps to increase the creepage clearance between the terminal 2 and the housing 1.

[0169] In one embodiment of this application, at least a portion of the second insulating member 322 is stacked on the second sealing member 332 along the axial direction of the terminal 2, which helps to increase the creepage clearance between the terminal 2 and the housing 1.

[0170] In one embodiment of this application, such as Figure 9 and Figure 10 The housing 1 has a central hole with a diameter of d2. Along the radial direction of the terminal 2, the length of the contact portion between the insulating member 32 and the sealing member 33 is L5, where 0 < L5 < 80% d2.

[0171] The length of the contact portion between the insulating component 32 and the sealing component 33 is greater than 0, ensuring effective contact between them. If the length of the contact portion between the insulating component 32 and the sealing component 33 is greater than or equal to 0.8d2, it indicates that the length of the contact portion is too long, which may lead to an oversized battery cell. Therefore, in this embodiment, the length of the contact portion between the insulating component 32 and the sealing component 33 is designed to be less than 80%d2.

[0172] In one embodiment of this application, such as Figure 9 and Figure 10 The first insulating member 321 has a sixth snap-fit ​​groove 3214, and the first sealing member 331 snaps into the sixth snap-fit ​​groove 3214. By forming the sixth snap-fit ​​groove 3214 in the first insulating member 321, the first sealing member 331 can be connected to the first insulating member 321 by snap-fit, thereby improving the connection stability between the first insulating member 321 and the first sealing member 331. At the same time, the design of the sixth snap-fit ​​groove 3214 helps to increase the creepage clearance between the terminal 2 and the housing 1.

[0173] In some examples, the first insulating element 321 and the first sealing element 331 can be connected by a clearance fit, the volume of which is greater than 0, to ensure the creepage clearance between the terminal 2 and the housing 1.

[0174] Specifically, the inner diameter of the sixth slot 3214 is D7, the diameter of terminal 2 is D, and the housing 1 has a central hole with a diameter of d2, wherein 1.0ld2 <D7<D。

[0175] The inner diameter of the sixth retaining groove 3214 is designed to be greater than 1.01d², providing sufficient space between the first insulating member 321 and the central hole for installing the sealing member 33. This facilitates the installation of the sealing member 33 and ensures a good sealing effect. Conversely, designing the inner diameter of the sixth retaining groove 3214 to be less than D avoids excessive radial depth in the sixth retaining groove 3214, which could lead to insufficient structural strength of the first insulating member 321.

[0176] In one embodiment of this application, such as Figure 9 and Figure 10 The first insulating member 321 and the first sealing member 331 are interference-fitted with an interference amount of b. The first sealing member 331 includes a first connecting part 3311, a second connecting part 3312 and a third connecting part 3313 connected in sequence. Along the axial direction of the terminal 2, the height of the first connecting part 3311 is H1, wherein 0.05≤b / H1≤0.6.

[0177] If b / H1 is less than 0.05, it is likely to result in insufficient connection stability and connection tightness between the first insulating member 321 and the first sealing member 331. If b / H1 is greater than 0.6, it is likely to reduce the service life of the first insulating member 321 or the first sealing member 331. Therefore, in this embodiment, b / H1 is set between 0.05 and 0.6.

[0178] In one embodiment of the present application, as Figure 9 and Figure 10 , the terminal 2 is formed with a seventh engaging groove, and the first insulating member 321 is engaged in the seventh engaging groove.

[0179] By forming the seventh engaging groove on the terminal 2, the first insulating member 321 can be connected to the terminal 2 by an engaging manner, improving the connection stability between the first insulating member 321 and the terminal 2. At the same time, the design of the seventh engaging groove is conducive to increasing the creepage distance between the terminal 2 and the housing 1.

[0180] Specifically, a second gap is formed between the side wall of the first insulating member 321 and the seventh engaging groove; the inner diameter of the seventh engaging groove is D8, and the outer diameter of the first sealing member 331 is D9, where D9 ≥ 1.01D8, to ensure that the creepage distance between the housing 1 and the terminal 2 meets the requirements and ensure the insulation performance of the battery cell.

[0181] In one embodiment of the present application, as Figure 9 and Figure 10 , the terminal 2 includes a pole 21 and a pressing ring 22, the pressing ring 22 is connected to the pole 21, the first insulating member 321 is engaged with the pole 21, the second insulating member 322 is engaged with the pressing ring 22, the pressing ring 22 includes a first section 222, a second section 223 and a third section 224 connected in sequence, the pole 21 includes a first part 212, a second part 213 and a third part 214 connected in sequence, a third gap is formed between the first insulating member 321 and one end of the first part 212 facing away from the second part 213, and a fourth gap is formed between the second insulating member 322 and one end of the first section facing away from the second section.

[0182] By providing the third gap, it is convenient for the assembly between the first insulating member 321 and the pole 21. By providing the fourth gap, it is convenient for the assembly between the second insulating member 322 and the pressing ring 22.

[0183] Specifically, the sizes of the third gap and the fourth gap are both L7, where 0 < L7 ≤ 2 mm, to ensure the electrical insulation performance.

[0184] In some examples, if the creepage distance between the pole 21 and the housing 1 is sufficient to meet the electrical distance requirements, the thickness of the part of the first insulating member 321 located between the first sealing member 331 and the pole 21 can be reduced to meet the feeding space of the first sealing member 331.

[0185] In some embodiments, such as Figure 11 and Figure 12 The battery cell includes a housing 1, terminals 2, and a separator 3. Terminals 2 are located at the housing 1, and separator 3 is located between terminals 2 and housing 1. Separator 3 is used to separate terminals 2 and housing 1. Separator 3 includes a first separator 311 and a second separator 312. The second separator 312 is located between the first separator 311 and terminals 2. One of the first separator 311 and terminals 2 has a snap-fit ​​portion 5, and the other of the first separator 311 and terminals 2 has a snap-fit ​​groove 6. The snap-fit ​​portion 5 is engaged with the snap-fit ​​groove 6.

[0186] According to the battery cell of this application embodiment, the separator assembly 3 can separate the terminal 2 and the housing 1 to prevent the terminal 2 and the housing 1 from contacting and causing a short circuit in the battery cell. The separator assembly 3 includes a first separator 311 and a second separator 312 distributed radially along the terminal 2, increasing the number of separators 31, so that the separator assembly 3 can effectively prevent the terminal 2 and the housing 1 from short-circuiting. At the same time, when the battery cell experiences thermal runaway, the first separator 311 can also protect the second separator 312 by separating the inner second separator 312 from the external high temperature, so that the structure of the inner second separator 312 can remain stable, thereby effectively preventing the battery cell from short-circuiting during thermal runaway.

[0187] Furthermore, the first separator 311 and the terminal 2 are connected together by the snap-fit ​​engagement of the snap-fit ​​part 5 and the snap-fit ​​groove 6, which is beneficial to the connection stability of the first separator 311 and the terminal 2. Since the second separator 312 is located between the first separator 311 and the terminal 2, it is beneficial to improve the connection stability of the first separator 311 and the second separator 312 at the same time, which can simplify the engagement structure between the first separator 311 and the second separator 312, and help to simplify the structure of the battery cell.

[0188] In one embodiment of this application, such as Figure 11 and Figure 12 Terminal 2 includes a pole post 21 and a pressure ring 22. The pressure ring 22 is connected to the pole post 21. The pole post 21 has a first fastening part 51. The first separator 311 has a first fastening groove 61. The first fastening part 51 is engaged with the first fastening groove 61.

[0189] It is understandable that a first fastening part 51 is formed on the pole post 21 and a first fastening groove 61 is formed on the first separator 311. By engaging the first fastening part 51 with the first fastening groove 61, a stable connection between the separator 31 and the pole post 21 can be achieved.

[0190] Specifically, the pole post 21 includes a first part 212, a second part 213 and a third part 214 connected in sequence. The first part 212 has a first fastening part 51 at the end away from the second part 213. The width of the first fastening part 51 along the radial direction of the terminal 2 is L8. The height of the second part 213 along the axial direction of the terminal 2 is H2, where 2≥L8 / H2≥0.08.

[0191] If L8 / H2 is less than 0.08, it means that the width of the first fastening part 51 is small, which may lead to insufficient connection stability between the pole post 21 and the first separator 311. If L8 / H2 is greater than 2, it means that the width of the first fastening part 51 is large, which may lead to the pole post 21 being too large. Therefore, in this embodiment, L8 / H2 is designed to be between 0.08 and 2.

[0192] Specifically, along the axial direction of terminal 2, the height of the first snap-fit ​​part 51 is not less than 0.05mm to ensure the snap-fit ​​stability of the first snap-fit ​​part 51 and the first snap-fit ​​groove 61, thereby ensuring the connection stability of the pole post 21 and the first separator 311.

[0193] In one embodiment of this application, such as Figure 11 and Figure 12 The pressure ring 22 has a second fastening part 52, and the first separator 311 has a second fastening groove. The second fastening part 52 is engaged with the second fastening groove.

[0194] By engaging the second fastening part 52 of the pressure ring 22 with the second fastening groove of the first separator 311, the first separator 311 and the pressure ring 22 can be connected together, and the connection stability between the first separator 311 and the pressure ring 22 is ensured.

[0195] Specifically, along the axial direction of terminal 2, the height of the second snap-fit ​​part 52 is not less than 0.05mm to ensure the snap-fit ​​stability of the second snap-fit ​​part 52 and the second snap-fit ​​groove, thereby ensuring the connection stability of the pressure ring 22 and the first separator 311.

[0196] In some examples, such as Figure 11 and Figure 12 Terminal 2 includes a pole post 21 and a retaining ring 22. The retaining ring 22 is connected to the pole post 21. The pole post 21 has a first fastening part 51. The first insulating member 321 has a first fastening groove 61. The first fastening part 51 is engaged with the first fastening groove 61. The retaining ring 22 has a second fastening part 52. The second insulating member 322 has a second fastening groove. The second fastening part 52 is engaged with the second fastening groove.

[0197] Specifically, the distance between the first fastening part 51 and the housing 1 is A1. The first sealing member 331 includes a first connecting part 3311, a second connecting part 3312 and a third connecting part 3313 connected in sequence. Along the axial direction of the terminal 2, the height of the second connecting part 3312 is a1, wherein 0.2a1≤A1≤2a1.

[0198] If A1 is less than 0.2a1, the compression of the first insulating component 321 is too large, which may reduce the service life of the first insulating component 321. If A1 is greater than 2a1, the compression of the first insulating component 321 is small, which may lead to insufficient installation stability of the first insulating component 321. Therefore, in this embodiment, A1 is set between 0.2a1 and 2a1.

[0199] Specifically, the distance between the second fastening part 52 and the housing 1 is A2. The second sealing member 332 includes a fourth connecting part 3321, a fifth connecting part 3322 and a sixth connecting part 3323 connected in sequence. Along the axial direction of the terminal 2, the height of the fifth connecting part 3322 is a2, wherein 0.2a2≤A2≤2a2.

[0200] If A2 is less than 0.2a2, the compression of the second insulating component 322 is too large, which may reduce the service life of the second insulating component 322. If A2 is greater than 2a2, the compression of the second insulating component 322 is small, which may lead to insufficient installation stability of the second insulating component 322. Therefore, in this embodiment, A2 is set between 0.2a2 and 2a2.

[0201] In one embodiment of this application, such as Figure 11 and Figure 12 An installation space is formed between the first insulating member 321 and the pole post 21, and at least a portion of the first sealing member 331 is disposed within the installation space. The installation space facilitates the installation of the first sealing member 331.

[0202] Specifically, along the radial direction of terminal 2, the length of the mounting space is L9, and along the axial direction of terminal 2, the thickness of housing 1 is T, where 0 <L9≤3T。

[0203] If the length of the installation space is greater than 0, it ensures that the first seal 331 can be installed between the first insulator 321 and the pole post 21. If the length of the installation space is less than 3 times the thickness of the housing 1, it can prevent the first seal 331 and the first insulator 321 from not being able to fit together properly due to the excessive length of the installation space.

[0204] In one embodiment of this application, such as Figure 11 and Figure 12 The connecting surfaces of the first separator 311 and the second separator 312 are continuous flat surfaces.

[0205] The first separator 311 and the terminal 2 can be stably connected together by the snap-fit ​​engagement of the snap-fit ​​part 5 and the snap-fit ​​groove 6, so that the second separator 312 can be stably installed between the first separator 311 and the terminal 2. That is, even if the first separator 311 and the second separator 312 are not connected by snap-fit ​​or other means, the second separator 312 can remain stable. Therefore, in this embodiment, the connection surface of the first separator 311 and the second separator 312 is designed as a continuous flat surface, which is beneficial to simplifying the structure of the battery cell.

[0206] In one embodiment of this application, such as Figure 13 The connecting surface between the first separator 311 and the second separator 312 is an inclined surface.

[0207] The first separator 311 and the terminal 2 can be stably connected together by the snap-fit ​​engagement of the snap-fit ​​part 5 and the snap-fit ​​groove 6, so that the second separator 312 can be stably installed between the first separator 311 and the terminal 2. That is, even if the first separator 311 and the second separator 312 are not connected by snap-fit ​​or other means, the second separator 312 can remain stable. Therefore, in this embodiment, the connection surface of the first separator 311 and the second separator 312 is designed as a bevel, which helps to simplify the structure of the battery cell.

[0208] In some examples, the slope angle ranges from 10° to 170°.

[0209] In one embodiment of this application, terminal 2 is formed with a stepped portion, and second separator 312 is snapped into the stepped portion. The outer diameter of the stepped portion is D10, and the minimum inner diameter of the inclined surface is D11, wherein D10≤D11, so as to avoid affecting the sealing length of the first seal 331 and ensure the sealing effect of the first seal 331.

[0210] According to an embodiment of the second aspect of this application, the battery pack includes the aforementioned battery cells.

[0211] According to the battery pack of this application embodiment, the separator assembly 3 can separate the terminal 2 and the housing 1 to prevent the terminal 2 and the housing 1 from contacting each other and causing a short circuit in the battery cell. The separator assembly 3 includes at least two separators 31 radially distributed along the terminal 2, increasing the number of separators 31, so that the separator assembly 3 can effectively prevent the terminal 2 and the housing 1 from short-circuiting. At the same time, when the battery cell experiences thermal runaway, the outer separator 31 can also protect the inner separator 31, separating the inner separator 31 from the high external temperature, so that the structure of the inner separator 31 can remain stable, thereby effectively preventing the battery cell from short-circuiting during thermal runaway.

[0212] According to an embodiment of the third aspect of this application, the electrical device includes the battery pack described above.

[0213] According to the electrical equipment of this application embodiment, the separator 3 can separate the terminal 2 and the housing 1 to prevent the terminal 2 and the housing 1 from contacting each other and causing a short circuit in the battery cell. The separator 3 includes at least two separators 31 radially distributed along the terminal 2, increasing the number of separators 31, so that the separator 3 can effectively prevent the terminal 2 and the housing 1 from short-circuiting. At the same time, when the battery cell experiences thermal runaway, the outer separator 31 can also protect the inner separator 31, separating the inner separator 31 from the high external temperature, so that the structure of the inner separator 31 can remain stable, thereby effectively preventing the battery cell from short-circuiting during thermal runaway.

[0214] It should be noted that electrical equipment can include vehicles, energy storage power supplies, consumer electronics, medical equipment, smart cities, etc. It is important to note that the above are merely illustrative examples of electrical equipment and do not impose any specific limitations on the types of equipment used.

[0215] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery cell, characterized in that, include: case; Terminals are located at the housing; An insulating element is disposed between the terminal and the housing, the insulating element being used to separate the terminal and the housing, the insulating element including a first insulating element and a second insulating element, the first insulating element and the second insulating element being respectively disposed on both sides of the housing; A sealing element is disposed between the terminal and the housing. Along the radial direction of the terminal, the first insulating element and the sealing element are distributed sequentially. The sealing element connects the first insulating element and the second insulating element to separate the housing and the terminal.

2. The battery cell according to claim 1, characterized in that, A first gap is formed between the end of the housing and the terminal, and the seal extends into the first gap.

3. The battery cell according to claim 2, characterized in that, The second insulating element extends into the first gap and is connected to the seal.

4. The battery cell according to claim 1, characterized in that, The terminal includes a pole and a pressure ring, the pressure ring being connected to the pole, and the seal extending to the connection between the pressure ring and the pole.

5. The battery cell according to claim 4, characterized in that, The sealing element is interference-fitted with the second insulating element, with an interference amount of a. The sealing element includes a first connecting part, a second connecting part, and a third connecting part connected in sequence. Along the axial direction of the terminal, the sum of the height of the second connecting part and the height of the third connecting part is H, wherein 0.05≤a / H≤0.

6.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The sealing element includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence. Along the axial direction of the terminal, the thickness of the second connecting portion is t2, the sum of the heights of the second and third connecting portions is H, and the thickness of the housing is T. H > t1 + t2; or, H < t1 + t2.

7. The battery cell according to any one of claims 1 to 5, characterized in that, The housing has a central hole, and the connection between the seal and the second insulating member is located within the central hole.

8. The battery cell according to any one of claims 1 to 5, characterized in that, The housing includes a first side and a second side disposed opposite to each other. The connection portion of the seal and the second insulating member is spaced apart from the first side of the housing, and the connection portion of the seal and the second insulating member is spaced apart from the second side of the housing.

9. The battery cell according to any one of claims 1 to 5, characterized in that, The housing includes a first side and a second side disposed opposite to each other. The first insulating member is disposed on the first side of the housing, and the second insulating member is disposed on the second side of the housing. The first end of the sealing member extends along the first side and is connected to the first insulating member, and the second end of the sealing member extends along the second side and is connected to the second insulating member.

10. The battery cell according to claim 9, characterized in that, Along the axial direction of the terminal, the thickness of the housing is T, and along the radial direction of the terminal, the length of the portion of the seal located on the second side is L6, wherein 0.05≤L6 / T≤3.

11. The battery cell according to any one of claims 1 to 5, characterized in that, The connection surface between the first insulating element and the sealing element is a stepped surface, an inclined surface, or a curved surface; and / or, the connection surface between the second insulating element and the sealing element is a stepped surface, an inclined surface, or a curved surface.

12. A battery pack, characterized in that, Includes the battery cell as described in any one of claims 1 to 11.

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

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