Battery cell, battery and electric equipment

Abstract

The utility model provides a battery cell, a battery and electric equipment. The battery cell comprises a shell, an electrode assembly, a cap, a positive electrode confluence plate and an insulating separator, the shell forms a mounting cavity and an inner convex part, the electrode assembly is mounted in the mounting cavity, the cap is arranged in the mounting cavity, the electrode assembly is positioned between the cap and the inner bottom wall of the shell, the positive electrode confluence plate is positioned between the electrode assembly and the cap, and the insulating separator is arranged in the inner convex part. The positive pole confluence plate is connected with the electrode assembly and the cap, and the insulating separator is arranged between the positive pole confluence plate and the inner convex part. The battery cell provided by the utility model can effectively prevent the positive electrode confluence plate from being in contact with the inner convex part of the shell, avoids short circuit caused by contact of the positive electrode and the negative electrode of the battery cell, and improves the safety of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to battery cells, batteries, and electrical devices. Background Technology

[0002] Battery cells are the core component of batteries and are widely used in energy storage systems, transportation vehicles, and consumer electronics.

[0003] The battery cells used in this technology have a risk of short circuit when the positive and negative electrodes are in contact. Utility Model Content

[0004] The embodiments of this application provide a battery cell, a battery, and an electrical device that can improve the technical problem of battery cells being prone to short circuits between positive and negative terminals.

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

[0006] The housing has a mounting cavity and an inner protrusion.

[0007] The electrode assembly is installed within the mounting cavity;

[0008] A cap is disposed within the mounting cavity, and the electrode assembly is located between the cap and the inner bottom wall of the housing;

[0009] A positive electrode busbar is located between the electrode assembly and the cap, and the positive electrode busbar connects the electrode assembly and the cap;

[0010] An insulating separator is disposed between the positive electrode busbar and the inner protrusion.

[0011] In one embodiment, the insulating separator abuts against the inner protrusion, and / or the insulating separator abuts against the positive electrode busbar.

[0012] In one embodiment, along the axial direction of the housing, the insulating spacer extends away from the inner bottom wall of the housing and abuts against the cap.

[0013] In one embodiment, the cap includes a body and a seal, the seal being fitted onto the body and located between the body and the housing, and the positive electrode busbar connecting the body and the electrode assembly.

[0014] In one embodiment, the insulating spacer extends away from the electrode assembly along the axial direction of the housing and abuts against the seal.

[0015] In one embodiment, along the radial direction of the housing, the orthographic projection of the insulating separator onto the side wall of the housing is adjacent to or partially overlaps with the orthographic projection of the seal onto the side wall of the housing.

[0016] In one embodiment, the insulating separator and the sealing element are integrally formed.

[0017] In one embodiment, along the radial direction of the housing, the orthographic projection of the inner protrusion onto the side wall of the housing lies within the orthographic projection of the insulating separator onto the side wall of the housing.

[0018] In one embodiment, the insulating separator is flush with the end face of the positive busbar that faces away from the electrode assembly; or,

[0019] Along the axial direction of the housing, the insulating separator protrudes from the end face of the electrode assembly away from the positive electrode busbar away from the end face of the electrode assembly.

[0020] In one embodiment, the height of the insulating spacer along the axial direction of the housing is between 0.3 mm and 0.7 mm; and / or,

[0021] Along the radial direction of the housing, the thickness of the insulating spacer is between 0.1 mm and 0.3 mm; and / or,

[0022] The inner diameter of the insulating separator is between 12 mm and 16 mm.

[0023] In one embodiment, the battery cell further includes an insulating pad located between the inner protrusion and the electrode assembly, and an insulating spacer connected to the side of the insulating pad opposite to the electrode assembly.

[0024] In one embodiment, the insulating pad is integrally formed with the insulating separator.

[0025] In one embodiment, the outer diameter of the insulating pad is between 15 mm and 19 mm; and / or,

[0026] Along the axial direction of the housing, the thickness of the insulating pad is between 0.1 mm and 0.3 mm.

[0027] Secondly, embodiments of this application provide a battery comprising the aforementioned battery cell.

[0028] Thirdly, embodiments of this application provide an electrical device including the battery described above.

[0029] The beneficial effects of the embodiments of this application are as follows:

[0030] In the embodiments of this application, an insulating separator is provided between the positive busbar and the inner protrusion of the housing. This insulating separator effectively isolates the inner protrusion from the positive busbar. When the battery cell deforms, the insulating separator prevents direct contact between the positive busbar and the inner protrusion, thus preventing contact between the positive and negative electrodes and avoiding short circuits. This improves the safety of the battery cell. Attached Figure Description

[0031] 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.

[0032] Figure 1 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0033] Figure 2 This is one of the cross-sectional views of the battery cell provided in the embodiments of this application;

[0034] Figure 3 This is provided by the embodiments of this application. Figure 2 Enlarged structural diagram at point A;

[0035] Figure 4 This is a second cross-sectional view of the battery cell provided in the embodiments of this application. Detailed Implementation

[0036] 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.

[0037] The following is combined with Figures 1 to 4 This application describes the battery cell, battery, and electrical device.

[0038] According to the embodiments of the first aspect of this application, such as Figure 1 , Figure 2 and Figure 3 The battery cell includes a housing 1, an electrode assembly 2, a cap 3, a positive electrode busbar 4, and an insulating separator 5. The housing 1 has a mounting cavity 11 and an inner protrusion 12. The electrode assembly 2 is installed in the mounting cavity 11, and the cap 3 is located in the mounting cavity 11. The electrode assembly 2 is located between the cap 3 and the inner bottom wall of the housing 1. The positive electrode busbar 4 is located between the electrode assembly 2 and the cap 3 and connects the electrode assembly 2 and the cap 3. The insulating separator 5 is located between the positive electrode busbar 4 and the inner protrusion 12.

[0039] According to the battery cell of this application embodiment, the housing 1 serves as the negative electrode of the battery cell. An insulating separator 5 is provided between the positive electrode busbar 4 and the inner protrusion 12 of the housing 1. The insulating separator 5 provides insulation between the inner protrusion 12 and the positive electrode busbar 4. When the battery cell deforms, the insulating separator 5 prevents direct contact between the positive electrode busbar 4 and the inner protrusion 12. This effectively prevents contact between the positive electrode busbar 4 and the inner protrusion 12 of the housing 1, avoiding short circuits caused by contact between the positive and negative electrodes of the battery cell, thus improving the safety of the battery cell.

[0040] In related technologies, there is no insulating separation between the inner protrusion 12 of the housing 1 and the positive busbar 4 of the battery cell. When the battery cell is deformed by compression, the inner protrusion 12 of the housing 1 and the positive busbar 4 may come into contact with each other, resulting in a short circuit between the positive and negative terminals of the battery cell. In this application, an insulating separator 5 is provided between the inner protrusion 12 of the housing 1 and the positive busbar 4. Even if the battery cell is deformed by compression, the insulating separator 5 can effectively prevent the inner protrusion 12 of the housing 1 from coming into contact with the positive busbar 4, thereby avoiding a short circuit between the positive and negative terminals of the battery cell.

[0041] For example, the insulating separator 5 can be a separate component and disposed between the positive busbar 4 and the inner protrusion 12. Alternatively, the insulating separator 5 can be integrally formed with other components of the battery cell and disposed between the positive busbar 4 and the inner protrusion 12.

[0042] In some embodiments, such as Figure 2 and Figure 3 The insulating separator 5 abuts against the inner protrusion 12.

[0043] It is understandable that when the cell deforms and causes the positive busbar 4 to shift towards the inward protrusion 12, the insulating separator 5 will be squeezed by the positive busbar 4. The insulating separator 5 and the inward protrusion 12 abut against each other, which can effectively prevent the insulating separator 5 from tilting due to the squeezing of the positive busbar 4, and ensure that the insulating separator 5 can effectively insulate and separate the positive busbar 4 and the inward protrusion 12.

[0044] In other words, if the insulating separator 5 does not abut against the inner protrusion 12, when the cell deforms, the insulating separator 5 may tilt under the pressure of the positive busbar 4, thus failing to separate the positive busbar 4 and the inner protrusion 12, resulting in a certain risk of short circuit between the positive and negative poles of the cell.

[0045] For example, when the middle part of the head of the battery cell is easily squeezed, the technical solution of this embodiment can be applied preferentially.

[0046] In some embodiments, the insulating separator 5 abuts against the positive busbar 4.

[0047] It is understandable that when the cell deforms and causes the inner protrusion 12 to shift towards the positive busbar 4, the insulating separator 5 will be squeezed by the inner protrusion 12. The insulating separator 5 and the positive busbar 4 abut against each other, which can effectively prevent the insulating separator 5 from tilting due to the squeezing of the inner protrusion 12, and ensure that the insulating separator 5 can effectively insulate and separate the positive busbar 4 and the inner protrusion 12.

[0048] In other words, if the insulating separator 5 does not come into contact with the positive busbar 4, when the cell deforms, the insulating separator 5 may tilt under the pressure of the inner protrusion 12, thus failing to separate the positive busbar 4 and the inner protrusion 12, resulting in a certain risk of short circuit between the positive and negative poles of the cell.

[0049] For example, when the outer wall of the battery cell is easily compressed, the technical solution of this embodiment can be applied preferentially.

[0050] In some embodiments, one side of the insulating separator 5 abuts against the inner protrusion 12, and the other side abuts against the positive busbar 4. It is understood that regardless of whether the insulating separator 5 is squeezed by either the inner protrusion 12 or the positive busbar 4, or by both simultaneously, the insulating separator 5 will not tilt, thus enabling it to effectively provide insulation.

[0051] In some embodiments, along the axial direction of the housing 1, the insulating separator 5 extends away from the inner bottom wall of the housing 1 and abuts against the cap 3.

[0052] Understandably, the insulating separator 5 extends away from the electrode assembly 2 to the cap 3 and abuts against the cap 3, ensuring the extension length of the insulating separator 5 so that the insulating separator 5 can effectively insulate and separate the inner protrusion 12 and the positive electrode busbar 4.

[0053] Understandably, the insulating separator 5 can cooperate with the cap 3 to completely separate the inner protrusion 12 and the positive busbar 4, which can effectively prevent the inner protrusion 12 and the positive busbar 4 from coming into contact.

[0054] In some examples, the insulating separator 5 may abut against the seal 32 of the cap 3, or against the orifice plate of the cap 3, or against any other suitable part of the cap 3.

[0055] In some embodiments, such as Figure 2 and Figure 3 The cap 3 includes a body 31 and a seal 32. The seal 32 is fitted onto the body 31 and located between the body 31 and the housing 1. The positive electrode busbar 4 connects the body 31 and the electrode assembly 2.

[0056] It is understandable that the seal 32 can seal the body 31 and also separate the body 31 from the housing 1, preventing the body 31 from directly contacting the housing 1.

[0057] In some embodiments, along the axial direction of the housing 1, the insulating separator 5 extends away from the electrode assembly 2 and abuts against the seal 32.

[0058] It is understandable that the insulating separator 5 extends toward the cap 3 and abuts against the seal 32 of the cap 3, ensuring the extension length of the insulating separator 5 so that the insulating separator 5 can effectively insulate and separate the inner protrusion 12 and the positive electrode busbar 4.

[0059] It is understandable that the seal 32 can also serve as an insulating separator. Thus, the insulating separator 5 abuts against the seal 32, which is equivalent to the seal 32 and the insulating separator 5 serving as insulating separators in the axial direction of the housing 1. This increases the insulating separator length in the axial direction of the housing 1. The insulating separator 5 and the seal 32 work together to effectively insulate the inner protrusion 12 and the positive electrode busbar 4, effectively preventing the inner protrusion 12 and the positive electrode busbar 4 from contacting each other.

[0060] For example, along the radial direction of the housing 1, the seal 32 is located between the positive electrode busbar 4 and the housing 1, and part of the seal 32 extends between the inner protrusion 12 and the positive electrode busbar 4, thereby the seal 32 can serve as an insulating separation between the inner protrusion 12 and the positive electrode busbar 4.

[0061] In some embodiments, along the radial direction of the housing 1, the orthographic projection of the insulating separator 5 onto the side wall of the housing 1 is adjacent to or partially overlaps with the orthographic projection of the seal 32 onto the side wall of the housing 1.

[0062] It is understandable that both the insulating separator 5 and the sealing element 32 can serve as insulating separators.

[0063] When the orthographic projection of the insulating separator 5 onto the side wall of the housing 1 is adjacent to the orthographic projection of the sealing member 32 onto the side wall of the housing 1, the insulating separator 5 and the sealing member 32 cooperate to increase the axial insulation separation length of the housing 1, which can effectively prevent the inner protrusion 12 from contacting the positive electrode busbar 4.

[0064] When the orthographic projection of the insulating separator 5 onto the side wall of the housing 1 coincides with the orthographic projection of the sealing member 32 onto the side wall of the housing 1, the insulating separator 5 and the sealing member 32 work together to increase the axial insulation separation length of the housing 1, which can effectively prevent the inner protrusion 12 from contacting the positive electrode busbar 4. At the same time, at the point where the sealing member 32 and the insulating separator 5 overlap, the radial insulation separation thickness of the housing 1 is increased, ensuring the insulation separation effect.

[0065] In some embodiments, the insulating separator 5 and the sealing member 32 are integrally formed. This ensures the connection stability between the insulating separator 5 and the sealing member 32, prevents the inner protrusion 12 and / or the positive electrode busbar 4 from passing through the connection between the insulating separator 5 and the sealing member 32, and effectively prevents the inner protrusion 12 and the positive electrode busbar 4 from contacting each other.

[0066] In some embodiments, along the radial direction of the housing 1, the orthographic projection of the inner protrusion 12 onto the side wall of the housing 1 lies within the orthographic projection of the insulating separator 5 onto the side wall of the housing 1. That is, along the radial direction of the housing 1, the insulating separator 5 can completely separate the inner protrusion 12 and the positive electrode busbar 4, preventing the inner protrusion 12 and the positive electrode busbar 4 from abutting each other, thus ensuring the safety of the battery cell.

[0067] In some embodiments, the insulating separator 5 is flush with the end face of the positive busbar 4 facing away from the electrode assembly 2. This allows the insulating separator 5 to completely separate the positive busbar 4 and the inner protrusion 12, preventing the inner protrusion 12 from contacting the positive busbar 4 and ensuring the safety of the battery cell.

[0068] In some embodiments, along the axial direction of the housing 1, the insulating separator 5 protrudes from the end face of the electrode assembly 2 away from the end face of the positive busbar 4 away from the electrode assembly 2. This allows the insulating separator 5 to completely separate the positive busbar 4 and the inner protrusion 12, preventing the inner protrusion 12 from contacting the positive busbar 4 and ensuring the safety of the battery cell.

[0069] It is understandable that the insulating separator 5 protrudes from the positive busbar 4, so that even if the insulating separator 5 is tilted due to the pressure of the inner protrusion 12 or the positive busbar 4, the axial length of the insulating separator 5 can still effectively insulate and separate the inner protrusion 12 and the positive busbar 4, preventing the inner protrusion 12 and the positive busbar 4 from contacting each other and ensuring the safety of the battery cell.

[0070] In some embodiments, such as Figure 3 Along the axial direction of housing 1, the height H of the insulating separator 5 is between 0.3 mm and 0.7 mm.

[0071] Understandably, if the height of the insulating separator 5 is less than 0.3 mm, it will be difficult for the insulating separator 5 to effectively separate the inner protrusion 12 and the positive busbar 4. If the height of the insulating separator 5 is greater than 0.7 mm, it will interfere with the installation of the cap 3. Therefore, this application sets the height of the insulating separator 5 between 0.3 mm and 0.7 mm, so that the insulating separator 5 can effectively separate the inner protrusion 12 and the positive busbar 4 without interfering with the cap 3.

[0072] In some embodiments, such as Figure 3 Along the radial direction of the housing 1, the thickness L3 of the insulating separator 5 is between 0.1 mm and 0.3 mm.

[0073] It is understandable that when the thickness of the insulating separator 5 is less than 0.1 mm, it is easily crushed and worn through when the battery cell is compressed and deformed, leading to contact between the inner protrusion 12 and the positive busbar 4. When the thickness of the insulating separator 5 is greater than 0.3 mm, it may interfere with the cap 3. Therefore, this application sets the thickness of the insulating separator 5 between 0.1 mm and 0.3 mm, which ensures the structural strength of the insulating separator 5 and prevents it from being crushed and worn through, while avoiding interference with the cap 3.

[0074] In some embodiments, the inner diameter of the insulating separator 5 is between 12 mm and 16 mm.

[0075] Understandably, when the inner diameter of the insulating separator 5 is less than 12mm, the insulating separator 5 will interfere with the cap 3. When the inner diameter of the insulating separator 5 is greater than 16mm, the insulating separator 5 is difficult to install due to the restriction of the inner protrusion 12, and is prone to deformation after installation. Therefore, this application sets the inner diameter of the insulating separator 5 between 12mm and 16mm.

[0076] In some embodiments, such as Figure 2 and Figure 3 The battery cell also includes an insulating pad 6, which is located between the inner protrusion 12 and the electrode assembly 2, and an insulating separator 5 is connected to the side of the insulating pad 6 away from the electrode assembly 2.

[0077] It is understandable that by placing the insulating pad 6 between the inner protrusion 12 and the electrode assembly 2, the insulating pad 6 can serve as an insulating separator, preventing the inner protrusion 12 and the electrode assembly 2 from directly contacting each other and causing a short circuit between the positive and negative terminals of the battery cell.

[0078] In some embodiments, the insulating pad 6 is integrally formed with the insulating separator 5, which can improve the installation stability of the insulating separator 5.

[0079] For example, the insulating separator 5 is connected to the inner edge of the insulating pad 6.

[0080] In some embodiments, the outer diameter of the insulating pad 6 is between 15 mm and 19 mm.

[0081] Understandably, if the outer diameter of the insulating pad 6 is less than 15 mm, it will be difficult for the insulating pad 6 to effectively insulate and separate the inner protrusion 12 and the electrode assembly 2. If the outer diameter of the insulating pad 6 is greater than 19 mm, it will have a significant impact on the diameter of the battery cell. Therefore, this application sets the outer diameter of the insulating pad 6 between 15 mm and 19 mm, ensuring that the insulating pad 6 can effectively insulate and separate the inner protrusion 12 and the electrode assembly 2 while reducing the impact on the diameter of the battery cell.

[0082] In some embodiments, the thickness of the insulating pad 6 along the axial direction of the housing 1 is between 0.1 mm and 0.3 mm.

[0083] It is understandable that if the thickness of the insulating pad 6 is less than 0.1 mm, the insulating pad 6 is easily worn through. If the thickness of the insulating pad 6 is greater than 0.3 mm, it will affect the axial length of the battery cell. Therefore, this application sets the thickness of the insulating pad 6 between 0.1 mm and 0.3 mm, which can reduce the impact on the axial length of the battery cell while ensuring the structural stability of the insulating pad 6.

[0084] In some embodiments, such as Figure 2 and Figure 3 The battery cell also includes an insulating component 7. The housing 1 is the negative electrode of the battery cell. The electrode assembly 2 includes a main body 21 and a positive electrode 22 that are connected to each other. The main body 21 is located between the positive electrode 22 and the bottom wall of the mounting cavity 11. The insulating component 7 is disposed between the housing 1 and the positive electrode 22. The insulating pad 6 is disposed between the housing 1 and the insulating component 7 or between the insulating component 7 and the positive electrode 22.

[0085] It is understandable that by providing an insulating member 7 between the positive electrode portion 22 and the housing 1, the positive electrode portion 22 and the housing 1 can be insulated and separated, which can effectively prevent the positive and negative electrodes of the battery cell from being short-circuited.

[0086] An insulating pad 6 is provided between the housing 1 and the insulating component 7 or between the insulating component 7 and the positive electrode 22. The insulating pad 6 can also serve as an insulating separator, that is, a double-layer insulating separator structure of the insulating component 7 and the insulating pad 6 is formed between the positive and negative electrodes of the battery cell, which can effectively prevent the positive electrode 22 from contacting the housing 1 and prevent the positive and negative electrodes of the battery cell from short-circuiting.

[0087] The insulating pad 6 can also increase the distance between the positive electrode 22 and the housing 1, reducing the probability of the positive electrode 22 contacting the housing 1 and effectively avoiding short circuits between the positive and negative electrodes of the battery cell.

[0088] It is understandable that since the main body 21 of the electrode assembly 2 is provided with a diaphragm, a short circuit between the positive and negative electrodes will not occur at the main body 21. However, the positive electrode portion 22 of the electrode assembly 2 protrudes from the main body 21, and there is no diaphragm between the positive electrode portion 22 and the housing 1, which makes it easy for a short circuit between the positive and negative electrodes to occur. Therefore, this application provides an insulating member 7 between the positive electrode portion 22 and the housing 1, which can effectively provide insulation and separation between the positive electrode portion 22 and the housing 1.

[0089] For example, the insulating element 7 may be insulating paper or insulating tape. It should be noted that the insulating element 7 is only illustrative and is not specifically limited; the insulating element 7 may also be any other suitable structural component with insulating properties.

[0090] In the embodiments of this application, the insulating pad 6 may be disposed between the side wall of the positive electrode portion 22 and the side wall of the housing 1, or it may be disposed on the side of the positive electrode portion 22 away from the main body 21.

[0091] In one embodiment of this application, such as Figure 2 and Figure 3 The inner protrusion 12 is located on the side of the positive electrode 22 away from the main body 21. The insulating member 7 includes a first insulating part 71 and a second insulating part 72 connected to each other. The first insulating part 71 is located between the side wall of the positive electrode 22 and the housing 1. The second insulating part 72 is located between the end face of the positive electrode 22 away from the main body 21 and the inner protrusion 12.

[0092] Understandably, the first insulating part 71 separates the side wall of the positive electrode 22 from the housing 1, preventing direct contact between the side wall of the positive electrode 22 and the housing 1. The second insulating part 72 separates the end face of the positive electrode 22 away from the main body 21 from the inner protrusion 12, preventing direct contact between the end face of the positive electrode 22 and the inner protrusion 12. In other words, this embodiment, through the provision of the first insulating part 71 and the second insulating part 72, can effectively separate the side and end face of the positive electrode 22 from the housing 1, achieving insulation separation between the positive electrode 22 and the housing 1, and effectively preventing short circuits between the positive and negative electrodes of the battery cell.

[0093] In the embodiments of this application, the orthographic projection of the inner protrusion 12 onto the positive electrode portion 22 is located within the orthographic projection of the second insulating portion 72 onto the positive electrode portion 22. This ensures that the second insulating portion 72 can effectively separate the inner protrusion 12 and the positive electrode portion 22, preventing a short circuit between the positive and negative electrodes.

[0094] In one embodiment of this application, the orthographic projection of the sidewall of the positive electrode portion 22 onto the sidewall of the housing 1 lies within the orthographic projection of the first insulating portion 71 onto the sidewall of the housing 1. Therefore, the first insulating portion 71 can completely cover the sidewall of the positive electrode portion 22, effectively separating the sidewall of the positive electrode portion 22 from the housing 1 and preventing contact between the sidewall of the positive electrode portion 22 and the housing 1, thus avoiding a short circuit between the positive and negative terminals of the battery cell.

[0095] It is understandable that the orthographic projection of the side wall of the positive electrode portion 22 onto the side wall of the housing 1 lies within the orthographic projection of the first insulating portion 71 onto the side wall of the housing 1. This can mean that the orthographic projection of the side wall of the positive electrode portion 22 onto the side wall of the housing 1 coincides with the orthographic projection of the first insulating portion 71 onto the side wall of the housing 1. Alternatively, it can mean that the area of ​​the orthographic projection of the side wall of the positive electrode portion 22 onto the side wall of the housing 1 is smaller than the area of ​​the orthographic projection of the first insulating portion 71 onto the side wall of the housing 1, and the orthographic projection of the side wall of the positive electrode portion 22 onto the side wall of the housing 1 lies within the orthographic projection of the first insulating portion 71 onto the side wall of the housing 1.

[0096] In one embodiment of this application, along the end face of the positive electrode portion 22 facing away from the main body 21, the second insulating portion 72 extends 2.5mm-4.5mm toward the center of the electrode assembly 2.

[0097] It is understandable that the length of the second insulating portion 72 extending toward the center of the electrode assembly 2 is set between 2.5mm and 4.5mm, that is, the radial length of the second insulating portion 72 covering the end face of the positive electrode portion 22 away from the main body 21 is between 2.5mm and 4.5mm, which ensures that the second insulating portion 72 can effectively separate the inner protrusion 12 and the end face of the positive electrode portion 22 away from the main body 21.

[0098] When the length of the second insulating portion 72 extending towards the center of the electrode assembly 2 is less than 2.5 mm, the second insulating portion 72 may not be able to completely separate the inner protrusion 12 and the end face of the positive electrode portion 22 away from the main body 21, and the battery cell still has a certain risk of short-circuiting between the positive and negative electrodes. The battery cell generally includes a cap 3, which is connected to the end of the positive electrode portion 22 away from the main body 21. Therefore, when the length of the second insulating portion 72 extending towards the center of the electrode assembly 2 is greater than 4.5 mm, the second insulating portion 72 may obstruct the connection between the electrode assembly 2 and the cap 3. In this embodiment, the length of the second insulating portion 72 extending towards the center of the electrode assembly 2 is set between 2.5 mm and 4.5 mm, which can effectively insulate the positive electrode portion 22 and the inner protrusion 12 without affecting the connection between the positive electrode portion 22 and the cap 3.

[0099] In one embodiment of this application, the thickness of the insulating element 7 is between 0.035 mm and 0.05 mm.

[0100] It is understandable that when the thickness of the insulating component 7 is less than 0.035 mm, the insulation performance is poor, making it difficult to effectively insulate and separate the positive electrode portion 22 from the housing 1, and it is also prone to wear. When the thickness of the insulating component 7 is greater than 0.05 mm, it may lead to an excessively large cell size. Therefore, in this embodiment, the thickness of the insulating component 7 is set between 0.035 mm and 0.05 mm, which ensures the insulation performance and structural strength of the insulating component 7 while also taking into account the size of the cell.

[0101] In one embodiment of this application, such as Figure 2 and Figure 3 The insulating pad 6 is located between the inner convex portion 12 and the positive electrode portion 22.

[0102] It is understandable that by placing the insulating pad 6 between the inner protrusion 12 and the positive electrode 22, a double insulating separation structure of insulating pad 6 and insulating element 7 is formed between the inner protrusion 12 and the positive electrode 22, which can effectively prevent the inner protrusion 12 and the positive electrode 22 from coming into contact and avoid short circuit between the positive and negative electrodes of the battery cell.

[0103] For example, the insulating pad 6 may be located between the insulating member 7 and the positive electrode portion 22, or it may be located between the insulating member 7 and the inner protrusion portion 12.

[0104] In one embodiment of this application, such as Figure 3 and Figure 4 The battery cell also includes a conductive handle 8, a positive electrode busbar 4 connected to the positive electrode portion 22, a connecting end of the conductive handle 8 connected to the positive electrode busbar 4, a vertical distance L1 from the center of the positive electrode busbar to the connection point between the conductive handle 8 and the positive electrode busbar 4, a width L2 for the conductive handle 8, and an inner diameter of the insulating pad 6.

[0105] The tolerance constant represents the clearance used for cell assembly to avoid assembly interference. The tolerance constant is between 0.5mm and 1mm, preferably 0.8mm.

[0106] It is understandable that when the inner diameter of the insulating pad 6 satisfies the above formula, the coverage area of ​​the insulating pad 6 is guaranteed, so that the insulating pad 6 can effectively insulate and separate the inner protrusion 12 and the positive electrode 22, and avoid the short circuit between the positive and negative electrodes.

[0107] It is understandable that the positive electrode busbar 4 is located between the insulating pad 6 and the positive electrode part 22. When the inner diameter of the insulating pad 6 meets the above formula, it ensures that the insulating pad 6 can effectively separate the positive electrode busbar 4 and the inner protrusion 12, and avoid the situation of short circuit between the positive and negative electrodes.

[0108] According to an embodiment of the second aspect of this application, the battery includes the aforementioned battery cell.

[0109] According to the battery embodiment of this application, an insulating separator 5 is provided between the positive electrode busbar 4 and the inner protrusion 12 of the casing 1. The insulating separator 5 can provide insulation between the inner protrusion 12 and the positive electrode busbar 4. When the battery cell deforms, the insulating separator 5 prevents the positive electrode busbar 4 and the inner protrusion 12 from directly contacting each other. That is, the insulating separator 5 can effectively prevent the positive electrode busbar 4 and the inner protrusion 12 of the casing 1 from contacting each other, avoiding short circuits caused by contact between the positive and negative electrodes of the battery cell, thus improving the safety of the battery cell and consequently the safety of the battery.

[0110] According to an embodiment of the third aspect of this application, the electrical device includes the battery described above.

[0111] According to the embodiments of this application, the electrical device uses an insulating separator 5 between the positive busbar 4 and the inner protrusion 12 of the housing 1. The insulating separator 5 can provide insulation between the inner protrusion 12 and the positive busbar 4. When the battery cell deforms, the insulating separator 5 prevents the positive busbar 4 and the inner protrusion 12 from directly contacting each other. This effectively prevents the positive busbar 4 from contacting the inner protrusion 12 of the housing 1, avoiding short circuits caused by contact between the positive and negative electrodes of the battery cell. This improves the safety of the battery cell, thereby enhancing the safety of the battery and ultimately improving the safety of the electrical device.

[0112] It should be noted that electrical equipment can be vehicles, aircraft, or household appliances. It is important to note that the above examples are merely illustrative and do not impose any specific limitations on the types of electrical equipment used.

[0113] 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: The housing has a mounting cavity and an inner protrusion. The electrode assembly is installed within the mounting cavity; A cap is disposed within the mounting cavity, and the electrode assembly is located between the cap and the inner bottom wall of the housing; A positive electrode busbar is located between the electrode assembly and the cap, and the positive electrode busbar connects the electrode assembly and the cap; An insulating separator is disposed between the positive electrode busbar and the inner protrusion.

2. The battery cell according to claim 1, characterized in that, The insulating separator abuts against the inner protrusion, and / or the insulating separator abuts against the positive electrode busbar.

3. The battery cell according to claim 1, characterized in that, Along the axial direction of the housing, the insulating spacer extends away from the inner bottom wall of the housing and abuts against the cap.

4. The battery cell according to claim 1, characterized in that, The cap includes a body and a seal. The seal is fitted onto the body and located between the body and the housing. The positive electrode busbar connects the body and the electrode assembly.

5. The battery cell according to claim 4, characterized in that, Along the axial direction of the housing, the insulating spacer extends away from the electrode assembly and abuts against the seal.

6. The battery cell according to claim 4, characterized in that, Along the radial direction of the housing, the orthographic projection of the insulating separator onto the side wall of the housing is adjacent to or partially overlaps with the orthographic projection of the seal onto the side wall of the housing.

7. The battery cell according to claim 5 or 6, characterized in that, The insulating separator and the sealing element are integrally formed.

8. The battery cell according to any one of claims 1 to 6, characterized in that, Along the radial direction of the housing, the orthographic projection of the inner protrusion onto the side wall of the housing lies within the orthographic projection of the insulating separator onto the side wall of the housing.

9. The battery cell according to any one of claims 1 to 6, characterized in that, The insulating separator is flush with the end face of the positive electrode assembly that faces away from the electrode assembly; or, Along the axial direction of the housing, the insulating separator protrudes from the end face of the electrode assembly away from the positive electrode busbar away from the end face of the electrode assembly.

10. The battery cell according to any one of claims 1 to 6, characterized in that: Along the axial direction of the housing, the height of the insulating spacer is between 0.3 mm and 0.7 mm; and / or, Along the radial direction of the housing, the thickness of the insulating spacer is between 0.1 mm and 0.3 mm; and / or, The inner diameter of the insulating separator is between 12 mm and 16 mm.

11. The battery cell according to any one of claims 1 to 6, characterized in that, The battery cell also includes an insulating pad located between the inner protrusion and the electrode assembly, and an insulating separator connected to the side of the insulating pad facing away from the electrode assembly.

12. The battery cell according to claim 11, characterized in that, The insulating pad and the insulating separator are integrally formed.

13. The battery cell according to claim 11, characterized in that: The outer diameter of the insulating pad is between 15 mm and 19 mm; and / or, Along the axial direction of the housing, the thickness of the insulating pad is between 0.1 mm and 0.3 mm.

14. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 13.

15. An electrical appliance, characterized in that, Includes the battery as described in claim 14.

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