Battery cell structure, battery and electric equipment

Abstract

The invention provides a battery cell structure, a battery and electric equipment. The battery cell structure comprises a shell, an electrode assembly, a cap, a sleeve and an insulating separator, a mounting cavity is formed in the shell, the shell is a battery cell negative electrode, the electrode assembly is mounted in the mounting cavity, the cap is located in the mounting cavity and connected to the electrode assembly, the electrode assembly is located between the cap and the bottom wall of the mounting cavity, the sleeve is arranged outside the shell in a sleeving mode, and the insulating separator is arranged in the shell. The insulating separator is arranged between the end face of one end, deviating from the bottom wall of the mounting cavity, of the shell and the sleeve. According to the battery cell structure, the condition of short circuit of the positive electrode and the negative electrode of the battery cell structure can be effectively prevented, and the safety of the battery cell structure is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cell structure, a battery and electrical equipment. Background Art

[0002] During the battery production process, multiple sets of tests are required. In one of the module tests, the module welding tab needs to be abutted against the battery cell.

[0003] Taking module testing as an example, during testing, due to the high temperature of the module welding piece, the battery cell in the related technology is easily affected by the welding piece and short-circuited between the positive and negative poles. Summary of the invention

[0004] The embodiments of the present application provide a battery cell structure, a battery and an electrical device, which can improve the technical problem that the battery cell is easily affected by the welding sheet and causes short circuit between the positive and negative electrodes.

[0005] In a first aspect, an embodiment of the present application provides a battery cell structure, including:

[0006] A shell is formed with a mounting cavity, and the shell is the negative electrode of the battery cell;

[0007] An electrode assembly is installed in the installation cavity;

[0008] A cap, located in the mounting cavity and connected to the electrode assembly, wherein the electrode assembly is located between the cap and the bottom wall of the mounting cavity;

[0009] A sleeve, sleeved outside the shell;

[0010] An insulating spacer is arranged between an end surface of the shell body at one end away from the bottom wall of the installation cavity and the sleeve.

[0011] In one embodiment, the shell includes a main body portion and a crimping portion, the crimping portion is connected to an end of the main body portion and extends toward the center of the mounting cavity, and the insulating partition is located between the crimping portion and the sleeve.

[0012] In one embodiment, along the axial direction of the shell, the crimping portion is located within the orthographic projection of the electrode assembly of the insulating separator; and / or,

[0013] The insulating spacer is crimped to a side of the crimping portion that is away from the bottom wall of the mounting cavity.

[0014] In one embodiment, the sleeve includes a tube body and a top covering portion, wherein the top covering portion is connected to an end surface of the tube body and extends toward the center of the mounting cavity, and the insulating spacer is located between the top covering portion and the crimping portion.

[0015] In one embodiment, a side of the insulating partition away from the center of the mounting cavity extends toward the tube body and at least partially abuts against the tube body.

[0016] In one embodiment, the inner diameter of the top covering portion is R1, the inner diameter of the insulating separator is R2, R1-R2≥RSS*2, wherein RSS is the statistical square tolerance of the inner diameter stamping tolerance of the insulating separator, the heat shrinkage tolerance of the top covering portion, and the positioning deviation of the insulating separator.

[0017] In one embodiment, the thickness of the insulating spacer is between 0.15 mm and 0.25 mm.

[0018] In one embodiment, one side of the insulating spacer abuts against the crimping portion, and the other side of the insulating spacer abuts against the sleeve.

[0019] In one embodiment, the insulating spacer is connected to the shell by at least one of bonding and clamping.

[0020] In a second aspect, an embodiment of the present application provides a battery, comprising the above-mentioned battery cell structure.

[0021] In a third aspect, an embodiment of the present application provides an electrical device, comprising the battery described above.

[0022] Beneficial effects of the embodiments of the present application:

[0023] In the embodiment of the present application, an insulating separator is provided between the end face of the shell at one end away from the bottom wall of the installation cavity and the sleeve, and at least two layers of insulating separation structure are formed at the end of the shell away from the bottom wall of the installation cavity. That is, when the battery structure is being tested, a sleeve and an insulating separator are provided between the shell as the negative electrode of the battery and the test component. When the sleeve is affected by the test component and wears or melts through, the insulating separator can still play an effective insulating and separating role for the shell and the test component to avoid direct contact between the shell and the test component, which can effectively prevent the positive and negative electrodes of the battery structure from being short-circuited, thereby improving the safety of the battery structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is one of the structural schematic diagrams of the battery cell structure provided in the embodiments of the present application;

[0026] Figure 2 It is a partial structural schematic diagram of a battery cell structure provided in an embodiment of the present application;

[0027] Figure 3 The embodiments of this application provide Figure 1 A schematic diagram of the structure enlargement at the center A;

[0028] Figure 4 is a cross-sectional view of a battery cell structure provided in an embodiment of the present application;

[0029] Figure 5 This is the second structural schematic diagram of the battery cell structure provided in the embodiment of the present application;

[0030] Figure 6 The embodiments of this application provide Figure 5 A magnified schematic diagram of the structure at point B in the middle. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0032] Combine the following Figures 1 to 6 Describe the battery cell structure, battery and electrical equipment of the present application.

[0033] According to the embodiment of the first aspect of the present application, Figure 5 and Figure 6 The battery cell structure also includes a shell 1, an electrode assembly 2, a cap 7, a sleeve 8 and an insulating separator 9. The shell 1 is formed with an installation cavity 11. The shell 1 is the negative electrode of the battery cell. The electrode assembly 2 is installed in the installation cavity 11. The cap 7 is located in the installation cavity 11 and connected to the electrode assembly 2. The electrode assembly 2 is located between the cap 7 and the bottom wall of the installation cavity 11. The sleeve 8 is sleeved outside the shell 1. The insulating separator 9 is arranged between the end surface of the shell 1 at one end away from the bottom wall of the installation cavity 11 and the sleeve 8.

[0034] According to the battery cell structure of the embodiment of the present application, an insulating separator 9 is provided between the end surface of the shell 1 at one end away from the bottom wall of the installation cavity 11 and the sleeve 8, and at least two layers of insulating separation structure are formed at the end of the shell 1 away from the bottom wall of the installation cavity 11. That is, when the battery cell structure is being tested, the sleeve 8 and the insulating separator 9 are provided between the shell 1 as the negative electrode of the battery cell and the test component. When the sleeve 8 is affected by the test component and wears or melts through, the insulating separator 9 can still play an effective insulating and separating role for the shell 1 and the test component to avoid direct contact between the shell 1 and the test component, which can effectively prevent the positive and negative electrodes of the battery cell structure from being short-circuited, thereby improving the safety of the battery cell structure.

[0035] Exemplarily, the sleeve 8 is made of insulating material, such as PET.

[0036] For example, in the related art, when the module test is performed on the battery cell, the module welding piece will abut against the sleeve 8. Due to the high temperature of the module welding piece, the sleeve 8 may be caused to shrink or melt. At this time, the module welding piece may contact the shell 1 and the cap 7 at the same time, resulting in a short circuit between the positive and negative poles of the battery cell structure. In the present application, an insulating separator 9 is provided between the sleeve 8 and the shell 1. When the sleeve 8 shrinks or melts under the influence of the module welding piece, there is an insulating separator 9 between the module welding piece and the shell 1 to play a separating role, which can effectively prevent the module welding piece from contacting the shell 1 and the cap 7 at the same time, thereby avoiding a short circuit between the positive and negative poles of the battery cell structure.

[0037] In some examples, the number of the insulating spacer 9 may be one; the number of the insulating spacer 9 may also be at least two, and at least two insulating spacers 9 are stacked between the housing 1 and the sleeve 8 .

[0038] In some examples, the insulating partition 9 is disposed between the end surface of the shell 1 at one end away from the bottom wall of the installation cavity 11 and the sleeve 8, which may mean that the insulating partition 9 is disposed at all positions between the end surface of the shell 1 at one end away from the bottom wall of the installation cavity 11 and the sleeve 8, or it may mean that the insulating partition 9 is disposed at part of the positions between the end surface of the shell 1 at one end away from the bottom wall of the installation cavity 11 and the sleeve 8.

[0039] In the embodiments of the present application, Figure 6 The housing 1 includes a main body portion 14 and a crimping portion 15 . The crimping portion 15 is connected to the end of the main body portion 14 and extends toward the center of the mounting cavity 11 . The insulating separator 9 is located between the crimping portion 15 and the sleeve 8 .

[0040] It can be understood that, by providing an insulating separator 9 between the crimping portion 15 and the sleeve 8, an insulating separator structure with at least two layers is formed at the crimping portion 15. When the battery structure is being tested, the sleeve 8 and the insulating separator 9 are provided between the crimping portion 15 and the test component. When the sleeve 8 is affected by the test component and wears or melts through, the insulating separator 9 can still effectively insulate and separate the crimping portion 15 and the test component to avoid direct contact between the crimping portion 15 and the test component, which can effectively prevent the positive and negative electrodes of the battery structure from being short-circuited, thereby improving the safety of the battery structure.

[0041] It can be understood that since the insulating separator 9 is arranged between the crimping portion 15 and the sleeve 8, when the sleeve 8 is affected by the test component and shrinks, the heat-shrunk sleeve 8 can clamp the insulating separator 9 with the crimping portion 15, thereby ensuring the installation stability of the insulating separator 9, so that the insulating separator 9 can effectively separate the crimping portion 15 and the test component.

[0042] It should be noted that the shell 1 may also be any other suitable structure, for example: the shell 1 includes a first end and a second end that are arranged opposite to each other, the first end is close to the bottom wall of the installation cavity 11, the second end extends along the direction from the electrode assembly 2 to the cap 7, and the insulating separator 9 is located between the end surface of the second end and the sleeve 8. In other words, the shell 1 may not have a structure of the crimping portion 15 extending toward the center of the installation cavity 11.

[0043] In one embodiment of the present application, along the axial direction of the housing 1, the orthographic projection of the crimping portion 15 on the electrode assembly 2 is located within the orthographic projection of the insulating separator 9 on the electrode assembly 2. The insulating separator 9 can completely cover the crimping portion 15, ensuring that when the battery cell is tested, the insulating separator 9 can completely separate the crimping portion 15 from the test component, and the insulating separator 9 can play an effective separation role.

[0044] It can be understood that the orthographic projection of the crimping portion 15 on the electrode assembly 2 is located within the orthographic projection of the insulating separator 9 on the electrode assembly 2, which may mean that the orthographic projection of the crimping portion 15 on the electrode assembly 2 is located and overlaps with the orthographic projection of the insulating separator 9 on the electrode assembly 2, or it may mean that the orthographic projection of the crimping portion 15 on the electrode assembly 2 is smaller than the orthographic projection of the insulating separator 9 on the electrode assembly 2, and the orthographic projection of the crimping portion 15 on the electrode assembly 2 is located within the orthographic projection of the insulating separator 9 on the electrode assembly 2.

[0045] In one embodiment of the present application, the insulating partition is crimped to a side of the crimping portion away from the bottom wall of the mounting cavity, so that the insulating partition can separate the test component and the crimping portion to avoid contact between the test component and the crimping portion.

[0046] In one embodiment of the present application, Figure 6The sleeve 8 includes a tube body 81 and a top covering portion 82 . The top covering portion 82 is connected to the end surface of the tube body 81 and extends toward the center of the mounting cavity 11 . The insulating spacer 9 is located between the top covering portion 82 and the crimping portion 15 .

[0047] It can be understood that the top covering portion 82 extends toward the center of the mounting cavity 11, ensuring that the top covering portion 82 can separate and protect the crimping portion 15. At the same time, the top covering portion 82 can also limit the relative movement between the sleeve 8 and the shell 1, thereby improving the stability of the connection between the sleeve 8 and the shell 1.

[0048] The insulating separator 9 is arranged between the top covering portion 82 and the crimping portion 15 , so that when the battery cell is tested, the crimping portion 15 has a double separation structure of the top covering portion 82 and the crimping portion 15 , which can effectively prevent the test component (such as the module welding piece) from contacting the crimping portion 15 .

[0049] In some examples, the material of the top cover 82 is, for example, PET. However, it should be understood that the top cover 82 may also be any other suitable insulating material.

[0050] In some examples, the thickness of the top cover 82 is, for example, between 0.08 mm and 0.12 mm, preferably 0.1 mm. When the thickness of the top cover 82 is less than 0.08 mm, the structural strength is insufficient. During daily use of the battery structure, the top cover 82 is easily worn through. When the battery structure is tested, the top cover 82 is difficult to play an effective separation role. When the thickness of the top cover 82 is greater than 0.12 mm, the volume of the battery may be too large. Therefore, in this embodiment, the thickness of the top cover 82 is set between 0.08 mm and 0.12 mm, which ensures the structural strength of the top cover 82 while taking into account the volume of the battery.

[0051] In one embodiment of the present application, a side of the insulating partition 9 away from the center of the installation cavity 11 extends toward the tube body 81 and at least partially abuts against the tube body 81 .

[0052] It can be understood that the insulating separator 9 extends toward the tube body 81 and at least partially abuts against the tube body 81 , thereby increasing the coverage of the insulating separator 9 and ensuring the separation effect of the insulating separator 9 .

[0053] In some examples, the insulating separator 9 extends toward the tube body 81 and maintains contact with the shell 1 , thereby increasing the area of ​​the shell 1 covered by the insulating separator 9 .

[0054] In some examples, one side of the insulating separator 9 extends toward the tube body 81 and abuts against the side wall surface of the tube body 81 , that is, the side wall surface of the insulating separator 9 fits against the side wall surface of the tube body 81 .

[0055] In one embodiment of the present application, the insulating spacer 9 includes, for example, an outer gasket, which is disposed between the end surface of the housing 1 at one end away from the bottom wall of the installation cavity 11 and the sleeve 8. It should be noted that the insulating spacer 9 can also be any other suitable structural member having an insulating and separating function.

[0056] In one embodiment of the present application, the inner diameter of the top covering portion 82 is R1, and the inner diameter of the insulating separator 9 is R2, R1-R2≥RSS*2, wherein RSS is the statistical square tolerance of the inner diameter stamping tolerance of the insulating separator 9, the heat shrinkage tolerance of the top covering portion 82, and the positioning deviation of the insulating separator 9.

[0057] It can be understood that when the difference between the inner diameter of the top covering portion 82 and the inner diameter of the insulating separator 9 satisfies the above formula, it is ensured that part of the insulating separator 9 will be exposed, that is, the top covering portion 82 will not completely cover the insulating separator 9, and the insulating separator 9 can be directly observed, which facilitates the detection of the insulating separator 9.

[0058] It can be understood that the positioning deviation refers to: when the insulating separator 9 is assembled with reference to the battery cell structure or the cap 7 or the shell 1, the center offset of the insulating separator 9 is obtained.

[0059] For example, the inner diameter stamping tolerance of the insulating separator 9 is, for example, ±0.05 mm, the heat shrinkage tolerance of the top cover 82 is, for example, ±0.4 mm, and the positioning deviation is, for example, ±0.5 mm. The statistical square tolerance of the inner diameter stamping tolerance of the insulating separator 9, the heat shrinkage tolerance of the top cover 82, and the positioning deviation is, for example, ±0.64 mm.

[0060] In one embodiment of the present application, the thickness of the insulating spacer 9 is between 0.15 mm and 0.25 mm.

[0061] It is understandable that the thickness of the insulating separator 9 is set between 0.15mm-0.25mm, preferably 0.2mm. When the thickness of the insulating separator 9 is less than 0.15mm, the structural strength of the insulating separator 9 is low. When the battery cell structure is tested, the insulating separator 9 is also easily damaged by test components such as module welding pieces, and it is difficult to play an effective separation role; when the thickness of the insulating separator 9 is greater than 0.25mm, it may cause the volume of the battery cell to be too large. Therefore, in this embodiment, the thickness of the insulating separator 9 is set between 0.15mm-0.25mm, which ensures the structural strength of the insulating separator 9 while taking into account the volume of the battery cell.

[0062] In one embodiment of the present application, one side of the insulating spacer 9 abuts against the crimping portion 15 , and the other side of the insulating spacer 9 abuts against the sleeve 8 .

[0063] It can be understood that the insulating separator 9 abuts against the crimping portion 15 and the sleeve 8 at the same time, so that the crimping portion 15 and the sleeve 8 can limit and fix the insulating separator 9, so that the insulating separator 9 remains stable.

[0064] It can be understood that when the sleeve 8 shrinks due to the influence of the test component, the heat-shrunk sleeve 8 can clamp the insulating partition 9 with the crimping portion 15, thereby ensuring the installation stability of the insulating partition 9, so that the insulating partition 9 can effectively separate the crimping portion 15 and the test component.

[0065] In one embodiment of the present application, the insulating spacer 9 is connected to the housing 1 by at least one of bonding and clamping.

[0066] It can be understood that when the insulating separator 9 and the shell 1 are connected together, when the sleeve 8 is affected by the test components such as the module welding piece and shrinks or reaches a molten state, the insulating separator 9 can still remain stable, and the insulating separator 9 can be prevented from falling, thereby ensuring that the insulating separator 9 can stably play the role of insulating separation.

[0067] Specifically, the insulating separator 9 and / or the shell 1 are provided with an adhesive layer 10, and the adhesive layer 10 connects the insulating separator 9 and the shell 1, and then the insulating separator 9 can be connected to the shell 1 by bonding, so that the insulating separator 9 and the shell 1 can remain connected, so that the insulating separator 9 can play an effective insulating and separating role, and connecting the insulating separator 9 and the shell 1 by bonding is simple and convenient.

[0068] Exemplarily, an adhesive layer 10 is provided on one side of the insulating separator 9 facing the crimping portion of the housing 1 , and the adhesive layer 10 can be bonded to the crimping portion to achieve bonding and fixing of the insulating separator 9 and the crimping portion.

[0069] Specifically, one of the insulating separator 9 and the housing 1 is provided with a clamping portion, and the other of the insulating separator 9 and the housing 1 is provided with a clamping groove, and the clamping portion is clamped in the clamping groove.

[0070] The insulating separator 9 can be connected to the shell 1 by snapping the snap-fitting part into the snap-fitting groove, so that the insulating separator 9 and the shell 1 can remain connected, so that the insulating separator 9 can play an effective insulating and separating role, and the insulating separator 9 and the shell 1 are connected by snapping, which is simple and convenient.

[0071] Exemplarily, the insulating separator 9 is formed with a snap-fitting portion, and the crimping portion of the shell 1 is formed with a snap-fitting groove. The snap-fitting portion and the snap-fitting groove are snap-fitted together, and the snap-fitting groove can limit the snap-fitting portion, so that the insulating separator 9 can maintain a stable connection with the crimping portion.

[0072] In one embodiment of the present application, Figure 1, Figure 2 and Figure 3 The battery cell structure also includes an insulating part 3 and an insulating pad 4.

[0073] The electrode assembly 2 includes a main body 21 and a positive electrode part 22 which are connected to each other. The main body 21 is located between the positive electrode part 22 and the bottom wall of the mounting cavity 11. The insulating part 3 is arranged between the shell 1 and the positive electrode part 22. The insulating pad 4 is arranged between the shell 1 and the insulating part 3 or between the insulating part 3 and the positive electrode part 22.

[0074] According to the battery cell structure of the embodiment of the present application, an insulating member 3 is provided between the positive electrode portion 22 and the shell 1, and the positive electrode portion 22 and the shell 1 are insulated and separated by the insulating member 3, which can effectively prevent the positive and negative electrodes of the battery cell structure from being short-circuited.

[0075] An insulating pad 4 is arranged between the shell 1 and the insulating part 3 or between the insulating part 3 and the positive electrode part 22. The insulating pad 4 can also play the role of insulating separation, that is, a double-layer insulating separation structure of the insulating part 3 and the insulating pad 4 is formed between the positive and negative electrodes of the battery cell structure, which can effectively avoid contact between the positive electrode part 22 and the shell 1 and prevent the positive and negative electrodes of the battery cell structure from short-circuiting.

[0076] The insulating pad 4 can also increase the distance between the positive electrode portion 22 and the shell 1, reducing the probability of the positive electrode portion 22 contacting the shell 1, and effectively avoiding the short circuit between the positive and negative electrodes in the battery structure.

[0077] It is understandable that the body 21 of the electrode assembly 2 is provided with a diaphragm, so that the positive and negative electrodes will not be short-circuited at the body 21. However, the positive electrode portion 22 of the electrode assembly 2 protrudes from the body 21, and there is no diaphragm between the positive electrode portion 22 and the shell 1, which makes it easy for the positive and negative electrodes to be short-circuited. Therefore, the present application provides an insulating member 3 between the positive electrode portion 22 and the shell 1, which can effectively insulate and separate the positive electrode portion 22 and the shell 1.

[0078] Exemplarily, the insulating member 3 is, for example, insulating paper or insulating tape. It should be noted that the insulating member 3 is only exemplified here and is not particularly limited. The insulating member 3 may also be any other suitable structural member with insulating properties.

[0079] It should be noted that the main body 21 mainly includes a diaphragm and a negative electrode portion, one end of the diaphragm is connected to the positive electrode portion 22, and the other end of the diaphragm is connected to the negative electrode portion.

[0080] In the embodiment of the present application, the insulating pad 4 may be disposed between the side wall surface of the positive electrode portion 22 and the side wall surface of the shell 1 , and may also be disposed on the side of the positive electrode portion 22 away from the body 21 .

[0081] In one embodiment of the present application, Figure 3The shell 1 is formed with an inner convex portion 12, which is located on the side of the positive electrode portion 22 away from the main body 21. The insulating member 3 includes a first insulating portion 31 and a second insulating portion 32 connected to each other. The first insulating portion 31 is located between the side wall surface of the positive electrode portion 22 and the shell 1, and the second insulating portion 32 is located between the end surface of the positive electrode portion 22 away from the main body 21 and the inner convex portion 12.

[0082] It can be understood that the first insulating portion 31 can separate the side wall of the positive electrode portion 22 and the shell 1 to avoid direct contact between the side wall of the positive electrode portion 22 and the shell 1, and the second insulating portion 32 can separate the end face of the positive electrode portion 22 away from the body 21 and the inner convex portion 12 to avoid direct contact between the positive electrode portion 22 and the inner convex portion 12. In other words, this embodiment can effectively separate the side and end faces of the positive electrode portion 22 from the shell 1 through the provision of the first insulating portion 31 and the second insulating portion 32, thereby achieving insulation separation between the positive electrode portion 22 and the shell 1, and effectively preventing the positive and negative electrodes from being short-circuited in the battery cell structure.

[0083] In the embodiment of the present application, the orthographic projection of the inner convex portion 12 on the positive electrode portion 22 is located within the orthographic projection of the second insulating portion 32 on the positive electrode portion 22. It is ensured that the second insulating portion 32 can effectively separate the inner convex portion 12 and the positive electrode portion 22 to avoid the short circuit between the positive and negative electrodes.

[0084] In one embodiment of the present application, the orthographic projection of the side wall surface of the positive electrode portion 22 on the side wall surface of the housing 1 is located within the orthographic projection of the first insulating portion 31 on the side wall surface of the housing 1. The first insulating portion 31 can completely cover the side wall surface of the positive electrode portion 22, so that the first insulating portion 31 can completely separate the side wall surface of the positive electrode portion 22 from the housing 1, and can effectively prevent the side wall surface of the positive electrode portion 22 from contacting the housing 1, so as to avoid the positive and negative short circuit in the battery structure.

[0085] It can be understood that the orthographic projection of the side wall surface of the positive pole portion 22 on the side wall surface of the shell 1 is located within the orthographic projection of the first insulating portion 31 on the side wall surface of the shell 1, which may mean that the orthographic projection of the side wall surface of the positive pole portion 22 on the side wall surface of the shell 1 coincides with the orthographic projection of the first insulating portion 31 on the side wall surface of the shell 1, or it may mean that the area of ​​the orthographic projection of the side wall surface of the positive pole portion 22 on the side wall surface of the shell 1 is smaller than the area of ​​the orthographic projection of the first insulating portion 31 on the side wall surface of the shell 1, and the orthographic projection of the side wall surface of the positive pole portion 22 on the side wall surface of the shell 1 is located within the orthographic projection of the first insulating portion 31 on the side wall surface of the shell 1.

[0086] In one embodiment of the present application, along the end surface of the positive electrode portion 22 facing away from the body 21 , the second insulating portion 32 extends 2.5 mm-4.5 mm toward the center of the electrode assembly 2 .

[0087] It can be understood that the length of the second insulating part 32 extending toward the center of the electrode assembly 2 is set between 2.5 mm and 4.5 mm, that is, the radial length of the second insulating part 32 covering the end face of the positive electrode part 22 away from the main body 21 is between 2.5 mm and 4.5 mm, which ensures that the second insulating part 32 can effectively separate the inner protrusion 12 and the end face of the positive electrode part 22 away from the main body 21.

[0088] When the length of the second insulating portion 32 extending toward the center of the electrode assembly 2 is less than 2.5 mm, the second insulating portion 32 may not be able to completely separate the inner convex portion 12 and the end face of the positive electrode portion 22 away from the body 21, and the battery cell structure still has a certain risk of positive and negative short circuit. The battery cell generally includes a cap 7, and the cap 7 is connected to the end of the positive electrode portion 22 away from the body 21. When the length of the second insulating portion 32 extending toward the center of the electrode assembly 2 is greater than 4.5 mm, the second insulating portion 32 may block the connection between the electrode assembly 2 and the cap 7. In this embodiment, the length of the second insulating portion 32 extending toward the center of the electrode assembly 2 is set between 2.5 mm and 4.5 mm, which can not only provide effective insulation separation between the positive electrode portion 22 and the inner convex portion 12, but also will not affect the connection between the positive electrode portion 22 and the cap 7.

[0089] In one embodiment of the present application, the insulating member 3 is provided with an adhesive layer, and the adhesive layer is suitable for bonding with the positive electrode portion 22 .

[0090] It is understandable that a bonding layer is provided on a layer of the insulating member 3 facing the positive electrode portion 22 , through which the insulating member 3 and the positive electrode portion 22 can be bonded together, so that the insulating member 3 can play a stable insulating and separating role for the positive electrode portion 22 and the shell 1 .

[0091] In one embodiment of the present application, the insulating member 3 is provided with an adhesive layer, and the adhesive layer is suitable for bonding with the insulating pad 4 .

[0092] It can be understood that an adhesive layer is provided on the side of the insulating member 3 facing the insulating pad 4, and the insulating member 3 and the insulating pad 4 can be bonded together through the adhesive layer, so that the insulating member 3 and the insulating pad 4 are stably connected.

[0093] It should be noted that an adhesive layer may be provided on both sides of the insulating member 3 at the same time, so that one side of the insulating member 3 may be bonded to the positive electrode portion 22 , and the other side may be bonded to the insulating pad 4 .

[0094] In one embodiment of the present application, the thickness of the insulating member 3 is between 0.035 mm and 0.05 mm.

[0095] It is understandable that when the thickness of the insulating member 3 is less than 0.035 mm, the insulation performance is poor, it is difficult to effectively insulate and separate the positive electrode portion 22 and the shell 1, and it is easy to wear. When the thickness of the insulating member 3 is greater than 0.05 mm, the volume of the battery cell may be too large. Therefore, in this embodiment, the thickness of the insulating member 3 is set between 0.035 mm and 0.05 mm, while ensuring the insulation performance and structural strength of the insulating member 3, the volume of the battery cell is taken into account.

[0096] In one embodiment of the present application, Figure 3 , the insulating pad 4 is located between the inner protrusion 12 and the positive electrode portion 22 .

[0097] It can be understood that the insulating pad 4 is arranged between the inner convex portion 12 and the positive electrode portion 22 to form a double insulating separation structure of the insulating pad 4 and the insulating member 3 between the inner convex portion 12 and the positive electrode portion 22, which can effectively prevent the inner convex portion 12 and the positive electrode portion 22 from contacting each other and avoid short-circuiting of the positive and negative poles in the battery cell structure.

[0098] Exemplarily, the insulating pad 4 may be located between the insulating member 3 and the positive electrode portion 22 , or between the insulating member 3 and the inner protrusion 12 .

[0099] In one embodiment of the present application, the ratio of the cross-sectional area of ​​the insulating pad 4 to the area of ​​the end surface of the positive electrode portion 22 facing away from the body 21 is between 60% and 96%. That is, 60% to 96% of the area of ​​the end surface of the positive electrode portion 22 facing the inner convex portion 12 is covered by the insulating pad 4, so that the insulating pad 4 can effectively insulate and separate the positive electrode portion 22 and the inner convex portion 12.

[0100] It is understandable that when the ratio of the cross-sectional area of ​​the insulating pad 4 to the area of ​​the end face of the positive electrode portion 22 away from the body 21 is less than 60%, the insulating pad 4 may not be able to completely separate the inner convex portion 12 and the end face of the positive electrode portion 22 away from the body 21, and the battery cell structure still has a certain risk of positive and negative short circuit; the battery cell generally includes a cap 7, and the cap 7 is connected to the end of the positive electrode portion 22 away from the body 21. If the ratio of the cross-sectional area of ​​the insulating pad 4 to the area of ​​the end face of the positive electrode portion 22 away from the body 21 is greater than 96%, the insulating pad 4 may block the connection between the positive electrode portion 22 and the cap 7. In this embodiment, the ratio of the cross-sectional area of ​​the insulating pad 4 to the area of ​​the end face of the positive electrode portion 22 away from the body 21 is between 60% and 96%, which can not only play an effective insulating separation between the positive electrode portion 22 and the inner convex portion 12, but also will not affect the connection between the positive electrode portion 22 and the cap 7.

[0101] In one embodiment of the present application, the thickness of the insulating pad 4 is between 0.2 mm and 0.5 mm.

[0102] It is understandable that when the thickness of the insulating pad 4 is less than 0.2 mm, the insulation performance is poor, it is difficult to effectively insulate and separate the positive electrode portion 22 and the inner convex portion 12, and it is easy to wear. When the thickness of the insulating member 3 is greater than 0.5 mm, the volume of the battery cell may be too large. Therefore, in this embodiment, the thickness of the insulating pad 4 is set between 0.2 mm and 0.5 mm, while ensuring the insulation performance and structural strength of the insulating pad 4, the volume of the battery cell is taken into account.

[0103] In one embodiment of the present application, the insulating pad 4 and the insulating member 3 at least partially overlap, and the difference between the inner diameter and the outer diameter of the overlapping portion of the insulating pad 4 and the insulating member 3 is between 1.5 mm and 4.5 mm.

[0104] It can be understood that the insulating pad 4 and the insulating member 3 at least partially overlap to achieve double insulation separation.

[0105] The difference between the inner diameter and the outer diameter of the overlapping portion of the insulating pad 4 and the insulating member 3 is set between 1.5 mm and 4.5 mm, which can also be understood as the radial length of the overlapping portion of the insulating pad 4 and the insulating member 3 is between 1.5 mm and 4.5 mm. When the difference between the inner diameter and the outer diameter of the overlapping portion is less than 1.5 mm, the area of ​​the portion with the double insulation separation structure may be too small, and it is difficult to achieve an effective double insulation separation effect; when the difference between the inner diameter and the outer diameter of the overlapping portion is greater than 4.5 mm, it means that the radial lengths of the insulating pad 4 and the insulating member 3 are both greater than 4.5 mm, and at this time, the insulating pad 4 and the insulating member 3 may affect the connection between the positive electrode portion 22 and the cap 7.

[0106] In some examples, the overlapped portion of the insulating pad 4 and the insulating member 3 is aligned with the inner protrusion 12 .

[0107] In one embodiment of the present application, Figure 3 and Figure 4 The cell structure includes a positive busbar 5 and a conductive handle 6. The positive busbar 5 is connected to the positive electrode portion 22. The connecting end of the conductive handle 6 is connected to the positive busbar 5. The vertical distance from the center of the positive busbar to the connection between the conductive handle 6 and the positive busbar 5 is L1. The width of the conductive handle 6 is L2. The inner diameter of the insulating pad 4 is

[0108] The tolerance constant represents the gap for assembling the cell structure to avoid assembly interference. The tolerance constant is between 0.5 mm and 1 mm, preferably 0.8 mm.

[0109] It can be understood that when the inner diameter of the insulating pad 4 satisfies the above formula, the coverage area of ​​the insulating pad 4 is guaranteed, so that the insulating pad 4 can effectively insulate and separate the inner convex part 12 and the positive electrode part 22 to avoid short circuit between the positive and negative electrodes.

[0110] It can be understood that the positive busbar 5 is located between the insulating pad 4 and the positive electrode portion 22. When the inner diameter of the insulating pad 4 satisfies the above formula, it is ensured that the insulating pad 4 can effectively separate the positive busbar 5 and the inner protrusion 12 to avoid short circuit between the positive and negative electrodes.

[0111] In one embodiment of the present application, Figure 3 A limiting cavity 13 is formed between the inner convex portion 12 and the positive electrode portion 22 , the insulating pad 4 and at least a portion of the insulating member 3 are arranged in the limiting cavity 13 , and the inner convex portion 12 abuts against the insulating pad 4 or the insulating member 3 .

[0112] It can be understood that one of the insulating pad 4 and the insulating member 3 abuts against the positive electrode portion 22, and the other of the insulating pad 4 and the insulating member 3 abuts against the inner convex portion 12. The inner convex portion 12 cooperates with the positive electrode portion 22 to limit the insulating pad 4 and the insulating member 3, so that the insulating pad 4 and the insulating member 3 remain stable. The inner convex portion 12 can also play a limiting role.

[0113] In one embodiment of the present application, along the axial direction of the electrode assembly 2 , the orthographic projection of the inner protrusion 12 on the positive pole portion 22 is located within the orthographic projection of the insulating member 3 on the positive pole portion 22 , and the orthographic projection of the inner protrusion 12 on the positive pole portion 22 is located within the orthographic projection of the insulating pad 4 on the positive pole portion 22 .

[0114] It can be understood that along the axial direction of the electrode assembly 2, an insulating part 3 and an insulating pad 4 are simultaneously arranged between the inner convex portion 12 and the positive electrode portion 22, so as to realize double insulation separation of the inner convex portion 12 and the positive electrode portion 22, effectively avoiding abutment between the inner convex portion 12 and the positive electrode portion 22, and preventing the positive and negative electrodes from being short-circuited.

[0115] In one embodiment of the present application, the insulating pad 4 is located between the insulating member 3 and the end surface of the positive electrode portion 22 away from the body 21, and along the axial direction of the electrode assembly 2, the orthographic projection of the insulating pad 4 on the positive electrode portion 22 is located within the orthographic projection of the insulating member 3 on the positive electrode portion 22, one end of the insulating member 3 is connected to the insulating pad 4, and the other end of the insulating member 3 extends toward the center of the positive electrode portion 22 and is connected to the positive electrode portion 22. The insulating member 3 is connected to the insulating pad 4 and the positive electrode portion 22 at the same time, thereby improving the installation stability of the insulating member 3 and the insulating pad 4.

[0116] According to an embodiment of the second aspect of the present application, a battery includes the above-mentioned battery cell structure.

[0117] According to the battery of the embodiment of the present application, an insulating separator 9 is provided between the end face of the shell 1 at one end away from the bottom wall of the installation cavity 11 and the sleeve 8, and at least two layers of insulating separation structure are formed at the end of the shell 1 away from the bottom wall of the installation cavity 11. That is, when the battery structure is being tested, the sleeve 8 and the insulating separator 9 are provided between the shell 1 as the negative electrode of the battery and the test component. When the sleeve 8 is affected by the test component and wears or melts through, the insulating separator 9 can still play an effective insulating and separating role for the shell 1 and the test component to avoid direct contact between the shell 1 and the test component, which can effectively prevent the positive and negative electrodes of the battery structure from being short-circuited, thereby improving the safety of the battery structure.

[0118] According to an embodiment of the third aspect of the present application, the electrical equipment includes the above-mentioned battery.

[0119] According to the electrical equipment of the embodiment of the present application, an insulating separator 9 is provided between the end face of the shell 1 at one end away from the bottom wall of the installation cavity 11 and the sleeve 8, and at least two layers of insulating separation structure are formed at the end of the shell 1 away from the bottom wall of the installation cavity 11. That is, when the battery structure is being tested, the sleeve 8 and the insulating separator 9 are provided between the shell 1 as the negative electrode of the battery and the test component. When the sleeve 8 is affected by the test component and wears or melts through, the insulating separator 9 can still play an effective insulating and separating role for the shell 1 and the test component to avoid direct contact between the shell 1 and the test component, which can effectively prevent the positive and negative electrodes of the battery structure from being short-circuited, thereby improving the safety of the battery structure.

[0120] It should be noted that the electrical equipment may be a vehicle, an aircraft, or a household appliance. It should be noted that the above is only an example of an electrical equipment and does not specifically limit the electrical equipment.

[0121] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery cell structure, characterized in that: include: A shell is formed with a mounting cavity, and the shell is the negative electrode of the battery cell; An electrode assembly is installed in the installation cavity; A cap, located in the mounting cavity and connected to the electrode assembly, wherein the electrode assembly is located between the cap and the bottom wall of the mounting cavity; A sleeve, sleeved outside the shell; An insulating spacer is arranged between an end surface of the shell body at one end away from the bottom wall of the installation cavity and the sleeve.

2. The battery cell structure according to claim 1, characterized in that: The shell comprises a main body and a crimping portion, wherein the crimping portion is connected to an end of the main body and extends toward the center of the mounting cavity, and the insulating partition is located between the crimping portion and the sleeve.

3. The battery cell structure according to claim 2, characterized in that: Along the axial direction of the shell, the crimping portion is located within the orthographic projection of the electrode assembly by the insulating separator; and / or, The insulating spacer is crimped to a side of the crimping portion that is away from the bottom wall of the mounting cavity.

4. The battery cell structure according to claim 2, characterized in that: The sleeve comprises a tube body and a top covering portion, wherein the top covering portion is connected to an end surface of the tube body and extends toward the center of the mounting cavity, and the insulating spacer is located between the top covering portion and the crimping portion.

5. The battery cell structure according to claim 4, characterized in that: A side of the insulating partition away from the center of the mounting cavity extends toward the tube body and at least partially abuts against the tube body.

6. The battery cell structure according to claim 4, characterized in that: The inner diameter of the top covering portion is R1, and the inner diameter of the insulating separator is R2, R1-R2≥RSS*2, wherein RSS is the statistical square tolerance of the inner diameter stamping tolerance of the insulating separator, the heat shrinkage tolerance of the top covering portion, and the positioning deviation of the insulating separator.

7. The battery cell structure according to any one of claims 1 to 6, characterized in that: The thickness of the insulating separator is between 0.15 mm and 0.25 mm.

8. The battery core structure according to any one of claims 2 to 6, characterized in that: One side of the insulating spacer abuts against the crimping portion, and the other side of the insulating spacer abuts against the sleeve.

9. The battery core structure according to any one of claims 1 to 6, characterized in that: The insulating spacer is connected to the shell by at least one of bonding and clamping.

10. A battery, characterized in that: Comprising the battery core structure as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising the battery as claimed in claim 10.

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