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 and a separation assembly. The terminal is arranged at the shell. The separation assembly is arranged between the terminal and the shell. The separation assembly is used for separating the terminal and the shell. The separation assembly comprises at least two separators which are sequentially distributed along the radial direction of the terminal. The electric core provided by the application can effectively avoid short circuit of the electric core in 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] A separator assembly is disposed between the terminal and the housing, the separator assembly being used to separate the terminal and the housing;

[0009] The separating assembly includes at least two separators arranged radially along the terminals.

[0010] In one embodiment, at least two of the spacers include:

[0011] An insulating element is disposed between the terminal and the housing, the insulating element serving to separate the terminal and the housing;

[0012] A seal is disposed between the terminal and the housing, the seal serving to separate the terminal and the housing.

[0013] In one embodiment, the inner side of the seal is connected to the terminal, and the insulating member is sleeved on the outer side of the seal; or, the inner side of the insulating member is connected to the terminal, and the seal is sleeved on the outer side of the insulating member.

[0014] In one embodiment, the insulating element includes a first insulating element and a second insulating element, which are respectively disposed on both sides of the housing.

[0015] In one embodiment, the seal includes a first seal and a second seal, a first end of the first seal being connected to a first end of the second seal, and the second ends of the first seal and the second seal being located on opposite sides of the housing, wherein at least a portion of the first seal and / or at least a portion of the second seal are located between an end of the housing and the terminal to separate the terminal and the housing.

[0016] In one embodiment, the thickness of the housing is T along the axial direction of the terminal, and the length of the contact portion between the first seal and the second seal is L4 along the radial direction of the terminal, wherein 0.2 ≤ L4 / T ≤ 1.5.

[0017] In one embodiment, the diameter of the terminal is D, the outer diameter of the first seal is D1, and the outer diameter of the second seal is D2, wherein...

[0018] D1 = D2; or,

[0019] D1 = (32% ~ 95.6%)D; or,

[0020] D2 = (32% ~ 95.6%)D.

[0021] In one embodiment, the first insulating member is located on the outside of the housing, the second insulating member is located on the inside of the housing, the second end of the first sealing member is located on the outside of the housing, and the second end of the second sealing member is located on the inside of the housing;

[0022] Along the radial direction of the terminal, the first insulating member includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence; along the radial direction of the terminal, the first sealing member includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence.

[0023] Along the axial direction of the terminal, the thickness of the second connecting segment is T2, and the thickness of the second connecting portion is t2, wherein,

[0024] T2-t2=0; or,

[0025] t2 > 5%T2; or,

[0026] T2 > 5% t2.

[0027] In one embodiment, the first insulating member is located on the outside of the housing, and the second insulating member is located on the inside of the housing;

[0028] Along the radial direction of the terminal, the first insulating member includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence, and the second insulating member includes a fourth connecting segment, a fifth connecting segment, and a sixth connecting segment connected in sequence;

[0029] Along the axial direction of the terminal, the thickness of the first connecting segment is T1, the thickness of the fourth connecting segment is T4, and the thickness of the housing is T, wherein...

[0030] T1 = T4; or,

[0031] |T1-T4|=(1%~67%)T.

[0032] In one embodiment, the second end of the first seal is located on the outer side of the housing, and the second end of the second seal is located on the inner side of the housing. The first seal includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence, and the second seal includes a fourth connecting portion, a fifth connecting portion, and a sixth connecting portion connected in sequence. The thickness of the second connecting portion is t2, the thickness of the fifth connecting portion is t4, and the thickness of the housing is T.

[0033] t2 = t4; or,

[0034] |t2-t4|=(1%~67%)T.

[0035] In one embodiment, the volume of the first connecting portion is V1, and the sum of the volumes of the second connecting portion and the third connecting portion is V2, wherein V1 = (0.5% to 80%)V2; and / or,

[0036] The volume of the fourth connecting part is V3, and the sum of the volumes of the fifth connecting part and the sixth connecting part is V4, where V3 = (0.5% to 80%)V4.

[0037] In one embodiment, the outer diameter of the first insulating member is D3, the outer diameter of the second insulating member is D4, and the diameter of the terminal is D, wherein...

[0038] |D3-D4| = 1% to 58% D; and / or,

[0039] D3 = 1% to 58% D; and / or,

[0040] D4 = 1% to 58% D.

[0041] In one embodiment, the seal and the insulating member are distributed sequentially in a direction away from the center of the terminal along the radial direction of the terminal, the insulating member having a first snap-fit ​​groove, and the seal being snapped into the first snap-fit ​​groove.

[0042] In one embodiment, the outer diameter of the seal is D1, and the inner diameter of the insulator is D5; along the radial direction of the terminal, the length of the contact portion between the insulator and the housing is d1, and the length of the engagement position between the seal and the insulator is L, wherein...

[0043] The minimum length Lmin of the engagement position between the seal and the insulation element is ≥ D1 - D5 ≥ 0; and / or,

[0044] The maximum length Lmax of the engagement position between the seal and the insulator is ≤99%D5; and / or,

[0045] The maximum length Lmax of the snap-fit ​​position between the seal and the insulator is ≤95%d1.

[0046] In one embodiment, along the axial direction of the terminal, the length of the contact portion between the seal and the end of the housing is h; the housing includes a first side and a second side disposed opposite to each other; along the radial direction of the terminal, the length of the contact portion between the seal and the first side of the housing is L1, and the length of the contact portion between the seal and the second side of the housing is L2; ​​the outer diameter of the terminal is D, and L1+L2+h=(3%~79%)D.

[0047] In one embodiment, the area of ​​the contact portion between the seal and the housing is S, the housing has a mounting cavity, and the area of ​​the side of the terminal away from the mounting cavity is s, where S = (3.4% to 80%)s.

[0048] In one embodiment, the compression ratio of the contact area between the seal and the housing is R, wherein 5% ≤ R ≤ 70%; and / or,

[0049] The compression ratio of the insulating component is r, where 1% ≤ r ≤ 50%.

[0050] In one embodiment, the terminal includes a pole and a pressure ring, the pressure ring being connected to the pole, the pole having a second snap-fit ​​groove, and the seal snapping into the second snap-fit ​​groove.

[0051] In one embodiment, the depth of the second snap-fit ​​groove along the axial direction of the pole post is h1; the pole post includes a first part, a second part and a third part connected in sequence, the first part and the second part forming the second snap-fit ​​groove, and the thickness of the second part along the axial direction of the pole post is T5, wherein 3% ≤ h1 / T5 ≤ 82%.

[0052] In one embodiment, the terminal includes a pole and a pressure ring, the pressure ring being connected to the pole, the pressure ring having a fourth snap-fit ​​groove, and the seal snapping into the fourth snap-fit ​​groove.

[0053] In one embodiment, the depth of the fourth snap-fit ​​groove along the axial direction of the pole post is h2; the pressure ring includes a first segment, a second segment and a third segment connected in sequence, the first segment and the second segment forming the fourth snap-fit ​​groove, and the thickness of the second segment along the axial direction of the pole post is T6, wherein 1% ≤ h2 / T6 ≤ 86%.

[0054] In one embodiment, the width of the second snap-fit ​​slot is W1, the width of the fourth snap-fit ​​slot is W2, and the outer diameter of the terminal is D, wherein 0.6%D≤W1 / W2≤73%D.

[0055] In one embodiment, 0.65 ≤ T5 / T6 ≤ 4.5; and / or, 0.65 ≤ T6 / T5 ≤ 4.5.

[0056] In one embodiment, the terminal includes a post and a retaining ring, the retaining ring being connected to the post, the diameter of the terminal being D, and the diameter of the retaining ring being D6.

[0057] 0.5≤D / D6≤8; or,

[0058] 0.5≤D6 / D≤8.

[0059] In one embodiment, the length of the seal along the radial direction of the terminal is L3, and the diameter of the terminal is D, wherein 1% ≤ L3 / D ≤ 56%.

[0060] In one embodiment, the terminal includes a pole and a pressure ring. The pole includes a body and a riveting portion, the riveting portion being riveted to the pressure ring. The volume of the body is V5, and the volume of the riveting portion is V6, wherein 1% ≤ V6 / V5 ≤ 45%.

[0061] In one embodiment, the housing has a central hole with a diameter of d2 and the housing has a diameter of d3, wherein 5% ≤ d2 / d3 ≤ 55%.

[0062] In one embodiment, two adjacent spacers are snap-fitted together.

[0063] In one embodiment, the terminal includes a post and a pressure ring, the pressure ring being connected to the post, and at least two separators including a first separator and a second separator, the second separator being located between the center of the post and the first separator, wherein...

[0064] The second separator has a third locking groove, and the pole post is engaged with the third locking groove; and / or,

[0065] The second separator has a fifth snap-fit ​​groove, and the pressure ring snaps into the fifth snap-fit ​​groove.

[0066] In one embodiment, the insulating element and the sealing element are made of different materials; and / or,

[0067] The insulating component is made of at least one of polypropylene, soluble polytetrafluoroethylene, polyphenylene sulfide, and polyethylene terephthalate, and the sealing component is made of at least one of nitrile rubber, silicone rubber, fluororubber, and EPDM rubber.

[0068] In one embodiment, the volume resistivity of the insulating element is greater than or equal to 10. 15 Ω·cm; and / or,

[0069] The dielectric strength of the insulating element is greater than or equal to 15 kV / mm; and / or,

[0070] The melting point of the insulating component is greater than or equal to 160 degrees Celsius.

[0071] In one embodiment, the decomposition temperature of the seal is greater than or equal to 250 degrees Celsius; and / or,

[0072] The sealing element is a thermosetting sealing element.

[0073] In one embodiment, the seal is enclosed within the housing.

[0074] Secondly, embodiments of this application provide a battery pack including the aforementioned battery cells.

[0075] Thirdly, embodiments of this application provide an electrical device including the battery pack described above.

[0076] The beneficial effects of the embodiments of this application are as follows:

[0077] In embodiments of this application, the separator assembly can separate the terminals and the housing to prevent short circuits in the battery cell caused by contact between the terminals and the housing. The separator assembly includes at least two separators radially distributed along the terminals, increasing the number of separators and effectively preventing short circuits between the terminals and the housing. Simultaneously, when thermal runaway occurs in the battery cell, the outer separator can also protect the inner separator, separating it from the external high temperature, thus maintaining the stability of the inner separator structure and effectively preventing short circuits in the battery cell during thermal runaway. Attached Figure Description

[0078] 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.

[0079] Figure 1 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0080] Figure 2 The embodiments of this application provide for... Figure 1 One of the labeled diagrams;

[0081] Figure 3 The embodiments of this application provide for... Figure 1 The second illustration with annotations;

[0082] Figure 4 Provided for embodiments of this application Figure 1 The third illustration with annotations;

[0083] Figure 5 One of the partial structural schematic diagrams of a battery cell provided for an embodiment of this application;

[0084] Figure 6 Provided for embodiments of this application Figure 5 A diagram illustrating the annotations;

[0085] Figure 7 A second schematic diagram of a partial structure of a battery cell provided for an embodiment of this application;

[0086] Figure 8 Provided for embodiments of this application Figure 7 A diagram illustrating the annotations;

[0087] Figure 9 The third schematic diagram of a partial structure of a battery cell provided for an embodiment of this application;

[0088] Figure 10 Provided for embodiments of this application Figure 9 A diagram illustrating the annotations;

[0089] Figure 11 Fourth schematic diagram of a partial structure of a battery cell provided for an embodiment of this application;

[0090] Figure 12 Provided for embodiments of this application Figure 11 A diagram illustrating the annotations;

[0091] Figure 13 The fifth schematic diagram of a partial structure of a battery cell provided for an embodiment of this application. Detailed Implementation

[0092] 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.

[0093] The following is combined Figures 1 to 13 This application describes the battery cell, battery pack, and electrical device.

[0094] 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.

[0095] 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.

[0096] Furthermore, the outer separator 31 can also block the inner separator 31. When the inner separator 31 melts at high temperature, the inner separator 31 is difficult to flow due to the blockage of the outer separator 31, so that the inner separator 31 can continue to separate the terminal 2 and the housing 1, preventing the cell from short-circuiting during thermal runaway.

[0097] 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.

[0098] It should be noted that the separator 31 can be either a sealing element 33 or an insulating element 32.

[0099] In one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 At least two separators 31 include:

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] The insulating element 32 also acts as a sealant for the sealing element 33. When the sealing element 33 melts at high temperatures, the sealing element 32 prevents it from flowing, allowing the sealing element 33 to continue separating the terminal 2 from the housing 1 and preventing short circuits in the cell during thermal runaway. Furthermore, the interlocking design of the insulating element 32 and the sealing element 33 helps increase the creepage clearance / creep distance between the terminal 2 and the housing 1.

[0106] 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, the insulating member 32 is positioned between the sealing member 33 and the terminal 2, while the sealing member 33 is positioned on the outer side of the insulating member 32. In this configuration, 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 also provide separation and protection for the insulating member 32. Furthermore, the interlocking design of the insulating member 32 and the sealing member 33 helps to increase the creepage clearance / creep distance between the terminal 2 and the housing 1.

[0107] In one embodiment of this application, the insulating element 32 and the sealing element 33 are made of different materials.

[0108] In one embodiment of this application, the insulating element 32 is made of at least one of polypropylene, soluble polytetrafluoroethylene, polyphenylene sulfide, and polyethylene terephthalate, and the sealing element 33 is made of at least one of nitrile rubber, silicone rubber, fluororubber, and EPDM rubber.

[0109] In one embodiment of this application, the volume resistivity of the insulating element 32 is greater than or equal to 10. 15 Ω·cm, so that the insulating element 32 can play an effective insulating role and ensure the insulation performance of the battery cell.

[0110] In one embodiment of this application, the dielectric strength of the insulating element 32 is greater than or equal to 15kV / mm, so that the insulating element 32 can play a stable insulating role and ensure the insulation performance of the battery cell.

[0111] In one embodiment of this application, the melting point of the insulating element 32 is greater than or equal to 160 degrees Celsius to improve the thermal stability of the insulating element 32, making the insulating element 32 less prone to melting.

[0112] In one embodiment of this application, the decomposition temperature of the seal 33 is greater than or equal to 250 degrees Celsius to improve the thermal stability of the seal 33, making it less likely to decompose when the battery cell experiences thermal runaway.

[0113] In one embodiment of this application, the seal 33 is a thermosetting seal 33. It is understood that the thermosetting seal 33 will not melt, so that the seal 33 can stably separate the terminal 2 and the housing 1.

[0114] In one embodiment of this application, the seal 33 is wrapped around the housing 1, that is, part of the housing is snapped into the seal 33, which helps to increase the creepage clearance / creep distance between the terminal 2 and the housing 1.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] If V1 is less than 0.5% of V2, the creepage clearance / creep distance 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%~80%) V2.

[0142] 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.

[0143] If V3 is less than 0.5% of V4, the creepage clearance / creep distance 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%~80%) of V4.

[0144] 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.

[0145] 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.

[0146] Specifically, D3 = 1% to 58%D, which ensures the creepage distance between terminal 2 and housing 1, and guarantees the insulation performance of the battery cell.

[0147] 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.

[0148] 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.

[0149] 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 / creep distance between the terminal 2 and the housing 1, which is beneficial to improving the insulation performance of the battery cell.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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%.

[0159] 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%.

[0160] 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.

[0161] 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 / creep distance between the electrode post 21 and the housing 1, thereby improving the insulation performance of the battery cell.

[0162] 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%.

[0163] 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%.

[0164] 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.

[0165] 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 / creep distance between the pressure ring 22 and the housing 1, which is beneficial to improving the insulation performance of the battery cell.

[0166] 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%.

[0167] 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%.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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%.

[0176] 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%.

[0177] 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%.

[0178] 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%.

[0179] 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%.

[0180] 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%.

[0181] 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.

[0182] 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 311.

[0183] 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 / creep distance between the pole post 21 and the housing 1.

[0184] 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 beneficial to increase the creepage clearance / creep distance between the pressure ring 22 and the housing 1.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] In one embodiment of this application, such as Figure 5 , Figure 6 , Figure 7 and Figure 8The 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] In some examples, the connection between the seal 33 and the second insulator 322 can be arranged horizontally or vertically.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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 / creep distance between the terminal 2 and the housing 1, so as to ensure the insulation performance of the battery cell.

[0215] 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 / creep distance between the terminal 2 and the housing 1, so as to ensure the insulation performance of the battery cell.

[0216] 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.

[0217] 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 / creep distance between the terminal 2 and the housing 1, thereby helping to ensure the insulation performance of the battery cell.

[0218] 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 / creep distance between the terminal 2 and the housing 1.

[0219] 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 / creep distance between the terminal 2 and the housing 1.

[0220] 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.

[0221] 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.

[0222] 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 / creep distance between the terminal 2 and the housing 1.

[0223] 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 / creep distance between the terminal 2 and the housing 1.

[0224] 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。

[0225] 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.

[0226] In one embodiment of this application, such as Figure 9 and Figure 10The 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.

[0227] If b / H1 is less than 0.05, it is easy to cause insufficient connection stability and sealing between the first insulating element 321 and the first sealing element 331. If b / H1 is greater than 0.6, it is easy to cause a reduction in the service life of the first insulating element 321 or the first sealing element 331. Therefore, in this embodiment, b / H1 is set between 0.05 and 0.6.

[0228] In one embodiment of this application, such as Figure 9 and Figure 10 Terminal 2 has a seventh snap-fit ​​groove, and the first insulating member 321 snaps into the seventh snap-fit ​​groove.

[0229] By forming a seventh snap-fit ​​groove on terminal 2, the first insulating member 321 can be connected to terminal 2 by snap-fit, thereby improving the connection stability between the first insulating member 321 and terminal 2. At the same time, the design of the seventh snap-fit ​​groove helps to increase the creepage clearance / creep distance between terminal 2 and housing 1.

[0230] Specifically, a second gap is formed between the first insulating member 321 and the side wall of the seventh locking groove; the inner diameter of the seventh locking groove is D8, and the outer diameter of the first sealing member 331 is D9, wherein D9≥1.01D8, so as to ensure that the creepage distance between the housing 1 and the terminal 2 meets the requirements and ensures the insulation performance of the battery cell.

[0231] In one embodiment of this application, such as Figure 9 and Figure 10 Terminal 2 includes a pole post 21 and a pressure ring 22. The pressure ring 22 is connected to the pole post 21. A first insulating member 321 is snapped into the pole post 21, and a second insulating member 322 is snapped into the pressure ring 22. The pressure ring 22 includes a first segment 222, a second segment 223, and a third segment 224 connected in sequence. The pole post 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 the end of the first part 212 that is away from the second part 213. A fourth gap is formed between the second insulating member 322 and the end of the first segment that is away from the second segment.

[0232] The third gap facilitates the assembly between the first insulator 321 and the pole post 21. The fourth gap facilitates the assembly between the second insulator 322 and the pressure ring 22.

[0233] Specifically, the dimensions of both the third gap and the fourth gap are L7, where 0<L7≤2mm, so as to ensure electrical insulation performance.

[0234] In some examples, if the creepage distance between the pole 21 and the housing 1 is sufficient to meet the electrical distance requirement, the thickness of the portion of the first insulating member 321 located between the first sealing member 331 and the pole 21 can be reduced to meet the material flow space of the first sealing member 331.

[0235] In some embodiments, as shown in Figure 11 and Figure 12 , the cell includes a housing 1, a terminal 2 and a separation assembly 3. The terminal 2 is disposed at the housing 1, the separation assembly 3 is disposed between the terminal 2 and the housing 1, and the separation assembly 3 is configured to separate the terminal 2 and the housing 1. The separation assembly 3 includes a first separator 311 and a second separator 312, the second separator 312 is located between the first separator 311 and the terminal 2. One of the first separator 311 and the terminal 2 is formed with a fastening portion 5, and the other of the first separator 311 and the terminal 2 is formed with a fastening groove 6, and the fastening portion 5 is snap-fitted into the fastening groove 6.

[0236] In the cell according to the embodiments of the present application, the separation assembly 3 can separate the terminal 2 from the housing 1, so as to prevent the cell from short-circuiting caused by the contact between the terminal 2 and the housing 1. The separation assembly 3 includes the first separator 311 and the second separator 312 distributed along the radial direction of the terminal 2, which increases the number of the separators 31, so that the separation assembly 3 can effectively prevent the terminal 2 and the housing 1 from being short-circuited. At the same time, when thermal runaway occurs in the cell, the first separator 311 can also play a role of separation and protection for the second separator 312, isolating the inner second separator 312 from the external high temperature, so that the structure of the inner second separator 312 can remain stable, and further the short circuit of the cell during thermal runaway can be effectively avoided.

[0237] Moreover, the first separator 311 and the terminal 2 are connected together through the snap-fit cooperation of the fastening portion 5 and the fastening 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 further beneficial to improve the connection stability of the first separator 311 and the second separator 312 at the same time, which can further simplify the matching structure between the first separator 311 and the second separator 312, and is beneficial to simplifying the structure of the cell.

[0238] In one embodiment of the present application, as shown in Figure 11 and Figure 12 , the terminal 2 includes a pole 21 and a pressing ring 22, the pressing ring 22 is connected to the pole 21, the pole 21 is formed with a first fastening portion 51, the first separator 311 is formed with a first fastening groove 61, and the first fastening portion 51 is snap-fitted into the first fastening groove 61.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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.

[0243] 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.

[0244] 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.

[0245] 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.

[0246] In some examples, such as Figure 11 and Figure 12Terminal 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.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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。

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] In some examples, the slope angle ranges from 10° to 170°.

[0259] 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.

[0260] According to an embodiment of the second aspect of this application, the battery pack includes the aforementioned battery cells.

[0261] 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.

[0262] According to an embodiment of the third aspect of this application, the electrical device includes the battery pack described above.

[0263] According to the electrical equipment of the present 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.

[0264] 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.

[0265] 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; A separator assembly is disposed between the terminal and the housing, the separator assembly being used to separate the terminal and the housing; The separating assembly includes at least two separators arranged radially along the terminals.

2. The battery cell according to claim 1, characterized in that, At least two of the said separators include: An insulating element is disposed between the terminal and the housing, the insulating element serving to separate the terminal and the housing; A seal is disposed between the terminal and the housing, the seal serving to separate the terminal and the housing.

3. The battery cell according to claim 2, characterized in that, The inner side of the seal is connected to the terminal, and the insulating element is sleeved on the outer side of the seal; or, the inner side of the insulating element is connected to the terminal, and the seal is sleeved on the outer side of the insulating element.

4. The battery cell according to claim 2, characterized in that, The insulating component includes a first insulating component and a second insulating component, which are respectively disposed on both sides of the housing.

5. The battery cell according to claim 4, characterized in that, The sealing element includes a first sealing element and a second sealing element. A first end of the first sealing element is connected to a first end of the second sealing element. The second ends of the first sealing element and the second sealing element are respectively located on both sides of the housing. At least a portion of the first sealing element and / or at least a portion of the second sealing element are located between the end of the housing and the terminal to separate the terminal and the housing.

6. The battery cell according to claim 5, 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 contact portion between the first seal and the second seal is L4, wherein 0.2≤L4 / T≤1.

5.

7. The battery cell according to claim 5, characterized in that, The diameter of the terminal is D, the outer diameter of the first seal is D1, and the outer diameter of the second seal is D2, wherein... D1=D2; or, D1 = (32%~95.6%)D; or, D2 = (32%~95.6%)D.

8. The battery cell according to claim 5, characterized in that, The first insulating member is located on the outside of the housing, the second insulating member is located on the inside of the housing, the second end of the first sealing member is located on the outside of the housing, and the second end of the second sealing member is located on the inside of the housing; Along the radial direction of the terminal, the first insulating member includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence; along the radial direction of the terminal, the first sealing member 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 segment is T2, and the thickness of the second connecting portion is t2, wherein, T2-t2=0; or, t2 > 5%T2; or, T2 > 5%t2.

9. The battery cell according to claim 8, characterized in that, Along the radial direction of the terminal, the second insulating member includes a fourth connecting segment, a fifth connecting segment, and a sixth connecting segment connected in sequence; Along the axial direction of the terminal, the thickness of the first connecting segment is T1, the thickness of the fourth connecting segment is T4, and the thickness of the housing is T, wherein... T1=T4; or, |T1-T4|=(1%~67%)T.

10. The battery cell according to claim 8, characterized in that, The second sealing element includes a fourth connecting portion, a fifth connecting portion, and a sixth connecting portion connected in sequence; the thickness of the second connecting portion is t2, the thickness of the fifth connecting portion is t4, and the thickness of the housing is T, wherein... t2=t4; or, |t2-t4|=(1%~67%)T.

11. The battery cell according to claim 10, characterized in that, The volume of the first connecting part is V1, and the sum of the volumes of the second connecting part and the third connecting part is V2, where V1 = (0.5%~80%)V2; and / or, The volume of the fourth connecting part is V3, and the sum of the volumes of the fifth connecting part and the sixth connecting part is V4, where V3 = (0.5%~80%)V4.

12. The battery cell according to claim 4, characterized in that, The outer diameter of the first insulating component is D3, the outer diameter of the second insulating component is D4, and the diameter of the terminal is D. |D3-D4|=1%~58%D; and / or, D3 = 1%~58%D; and / or, D4 = 1%~58%D.

13. The battery cell according to claim 2, characterized in that, Along the radial direction of the terminal, the sealing element and the insulating element are distributed sequentially in a direction away from the center of the terminal, the insulating element having a first snap-fit ​​groove, and the sealing element snapping into the first snap-fit ​​groove.

14. The battery cell according to claim 13, characterized in that, The outer diameter of the seal is D1, and the inner diameter of the insulator is D5; along the radial direction of the terminal, the length of the contact portion between the insulator and the housing is d1, and the length of the engagement position between the seal and the insulator is L, wherein... The minimum length Lmin of the engagement position between the seal and the insulation element is ≥ D1 - D5 ≥ 0; and / or, The maximum length Lmax of the engagement position between the seal and the insulation is ≤99%D5; and / or, The maximum length Lmax of the engagement position between the seal and the insulator is ≤95%d1.

15. The battery cell according to any one of claims 2 to 14, characterized in that, Along the axial direction of the terminal, the length of the contact portion between the seal and the end of the housing is h; the housing includes a first side and a second side disposed opposite to each other, and along the radial direction of the terminal, the length of the contact portion between the seal and the first side of the housing is L1, and the length of the contact portion between the seal and the second side of the housing is L2; ​​the outer diameter of the terminal is D, and L1+L2+h=(3%~79%)D.

16. The battery cell according to any one of claims 2 to 14, characterized in that, The contact area between the seal and the housing is S, the housing has a mounting cavity, and the area of ​​the side of the terminal away from the mounting cavity is s, where S = (3.4%~80%)s.

17. The battery cell according to any one of claims 2 to 14, characterized in that, The compression ratio of the contact area between the seal and the housing is R, where 5% ≤ R ≤ 70%; and / or, The compression ratio of the insulating component is r, where 1% ≤ r ≤ 50%.

18. The battery cell according to any one of claims 2 to 14, characterized in that, The terminal includes a pole and a pressure ring, the pressure ring is connected to the pole, the pole has a second snap-fit ​​groove, and the seal is snapped into the second snap-fit ​​groove.

19. The battery cell according to claim 18, characterized in that, Along the axial direction of the pole post, the groove depth of the second snap-fit ​​groove is h1; the pole post includes a first part, a second part and a third part connected in sequence, the first part and the second part surround to form the second snap-fit ​​groove, and along the axial direction of the pole post, the thickness of the second part is T5, wherein 3%≤h1 / T5≤82%.

20. The battery cell according to claim 19, characterized in that, The terminal includes a pole and a pressure ring, the pressure ring is connected to the pole, the pressure ring forms a fourth snap-fit ​​groove, and the seal is snapped into the fourth snap-fit ​​groove.

21. The battery cell according to claim 20, characterized in that, Along the axial direction of the pole post, the groove depth of the fourth snap-fit ​​groove is h2; the pressure ring includes a first section, a second section and a third section connected in sequence, the first section and the second section surround to form the fourth snap-fit ​​groove, and along the axial direction of the pole post, the thickness of the second section is T6, wherein 1%≤h2 / T6≤86%.

22. The battery cell according to claim 20, characterized in that, The width of the second snap-fit ​​slot is W1, the width of the fourth snap-fit ​​slot is W2, and the outer diameter of the terminal is D, wherein 0.6%D≤W1 / W2≤73%D.

23. The battery cell according to claim 21, characterized in that, 0.65≤T5 / T6≤4.5; and / or, 0.65≤T6 / T5≤4.

5.

24. The battery cell according to any one of claims 1 to 14, characterized in that, The terminal includes a pole and a pressure ring, the pressure ring being connected to the pole. The diameter of the terminal is D, and the diameter of the pressure ring is D6. 0.5≤D / D6≤8; or, 0.5≤D6 / D≤8.

25. The battery cell according to any one of claims 2 to 14, characterized in that, Along the radial direction of the terminal, the length of the seal is L3, and the diameter of the terminal is D, wherein 1%≤L3 / D≤56%.

26. The battery cell according to any one of claims 1 to 14, characterized in that, The terminal includes a pole and a pressure ring. The pole includes a body and a riveting part. The riveting part is riveted to the pressure ring. The volume of the body is V5, and the volume of the riveting part is V6, wherein 1%≤V6 / V5≤45%.

27. The battery cell according to any one of claims 1 to 14, characterized in that, The shell has a central hole with a diameter of d2 and the shell has a diameter of d3, wherein 5% ≤ d2 / d3 ≤ 55%.

28. The battery cell according to any one of claims 1 to 14, characterized in that, The two adjacent separators are snapped together.

29. The battery cell according to any one of claims 1 to 14, characterized in that, The terminal includes a pole and a pressure ring, the pressure ring being connected to the pole. At least two separators include a first separator and a second separator, the second separator being located between the center of the pole and the first separator. The second separator has a third locking groove, and the pole post is engaged with the third locking groove; and / or, The second separator has a fifth snap-fit ​​groove, and the pressure ring snaps into the fifth snap-fit ​​groove.

30. The battery cell according to any one of claims 2 to 14, characterized in that, The insulating component and the sealing component are made of different materials.

31. The battery cell according to any one of claims 2 to 14, characterized in that, The volume resistivity of the insulating component is greater than or equal to 10. 15 Ω·cm; and / or, The dielectric strength of the insulating element is greater than or equal to 15 kV / mm; and / or, The melting point of the insulating component is greater than or equal to 160 degrees Celsius.

32. The battery cell according to any one of claims 2 to 14, characterized in that, The decomposition temperature of the seal is greater than or equal to 250 degrees Celsius; and / or, The sealing element is a thermosetting sealing element.

33. The battery cell according to any one of claims 2 to 14, characterized in that, The seal is enclosed within the housing.

34. A battery pack, characterized in that, Includes the battery cell as described in any one of claims 1 to 33.

35. An electrical appliance, characterized in that, Includes the battery pack as described in claim 34.

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