Battery monomer, battery and electric device

Abstract

The invention discloses a battery monomer, a battery and a power utilization device. Wherein the battery monomer comprises a shell, a battery cell, a first insulating layer and a second insulating layer, and the battery cell is accommodated in the shell and is provided with a first end and a second end which are opposite to each other; the first insulating layer is arranged on the outer side surface of the first end of the battery cell; the second insulating layer comprises a main body section; the inner diameter of the position, corresponding to the first insulating layer, of the shell is Da, the outer diameter of the first insulating layer is D1, the inner diameter of the position, corresponding to the main body section, of the shell is Db, and the outer diameter of the main body section is D2, Da-D1gt; and Db-D2. Through the mode, the columnar battery cell can be ensured to smoothly enter the shell, and meanwhile, the shaking of the battery cell in the shell along the radial direction of the shell can be reduced.

Description

Battery cells, batteries and electrical devices

Technical field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. [Background Technology]

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] As an important component of a battery, the performance of the battery cell determines the performance of the battery. However, the adapter of the battery cell is prone to breakage.

[0004] [Summary of the invention]

[0005] The purpose of the present application is to provide a battery cell, a battery and an electrical device, which can ensure that the battery cell is smoothly inserted into the shell and at the same time reduce the shaking of the battery cell in the shell along the radial direction of the shell.

[0006] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a battery cell, the battery cell comprising a shell, a battery cell, a first insulating layer and a second insulating layer, wherein the battery cell is accommodated in the shell and has a first end and a second end relative to each other; at least a portion of the first insulating layer is arranged on the outer side surface of the first end of the battery cell; at least a portion of the second insulating layer is arranged on the outer side surface of the second end of the battery cell, and the second insulating layer includes a main body segment; the inner diameter of the corresponding position of the shell and the first insulating layer is Da, the outer diameter of the first insulating layer is D1, the inner diameter of the corresponding position of the shell and the main body segment is Db, the outer diameter of the main body segment is D2, Da-D1>Db-D2.

[0007] In the above scheme of the present application, by setting Da-D1>Db-D2, the difference between the inner diameter of the shell and the outer diameter of the first insulating layer is larger, that is, the gap between the first insulating layer and the shell is larger, which can facilitate the insertion of the battery cell into the shell, while the difference between the inner diameter of the shell and the outer diameter of the main section is smaller, which is beneficial to reduce the shaking of the battery cell in the shell.

[0008] In one embodiment of the present application, the main body section and the shell are interference fit.

[0009] In the above technical solution, by making the main body section and the shell have an interference fit, the shell can better restrain the battery cell, and the shaking of the battery cell in the shell along the radial direction of the shell can be reduced.

[0010] In one embodiment of the present application, 0 <D2-Db<0.1mm。

[0011] In the above technical solution, by setting the difference between the outer diameter D2 of the main body segment and the inner diameter Db of the shell to be less than 0.1 mm, the main body segment and the shell can satisfy the interference fit, and the situation where the battery cell together with the first insulating layer and the second insulating layer cannot be pushed into the shell due to the outer diameter D2 of the main body segment being too large will not occur.

[0012] In one embodiment of the present application, Da-D1>0, Db-D2≥0.

[0013] In the above technical solution, by setting Da-D1>0, Db-D2≥0, that is, after the battery cell is placed in the shell, there is a gap between the first insulating layer and the shell, and there is also a gap between the second insulating layer and the shell or the gap is 0. This prevents the outer diameters of the first insulating layer and the second insulating layer from being too large to prevent the battery cell from being smoothly placed in the shell.

[0014] In one embodiment of the present application, the battery cell includes a battery cell body and a first pole ear and a second pole ear; the first pole ear and the second pole ear have opposite polarities; the shell is designed with equal inner diameters, the battery cell body is designed with equal outer diameters, and the thickness of the main segment is greater than the thickness of the first insulating layer; or, the inner diameter of the shell gradually decreases along the direction from the first end to the second end of the battery cell; the battery cell body is designed with equal outer diameters, and the thickness of the main segment is equal to the thickness of the first insulating layer.

[0015] In the above technical solution, when the inner diameter of the shell is designed to be equal, and the outer diameter of the battery body is designed to be equal, by making the thickness of the main section greater than the thickness of the first insulating layer, after the battery cell is guided into the shell by the first insulating layer, the gap between the main section and the shell is smaller than the gap between the first insulating layer and the shell, which is beneficial to reducing the shaking of the battery cell in the shell; when the inner diameter of the shell gradually decreases from the first end to the second end of the battery cell, and the outer diameter of the battery body is designed to be equal, by making the thickness of the main section equal to the thickness of the first insulating layer, since the inner diameter of the shell changes gradually, when the first insulating layer guides the battery cell into the shell, it enters from the side with the larger inner diameter of the shell to the side with the smaller inner diameter of the shell, and the thickness of the main section is equal to the thickness of the first insulating layer, so that the first insulating layer clamps the second end of the battery cell in the shell, thereby restraining the battery cell.

[0016] In one embodiment of the present application, the shell is designed with a constant inner diameter, and the second insulating layer also includes a contraction section connected to the main section, and the contraction section is located on the side of the main section close to the first insulating layer; along the direction from the second end to the first end of the battery cell, the outer diameter of the contraction section gradually decreases.

[0017] In the above technical solution, by providing a constriction section and along the direction from the second end to the first end of the battery cell, the outer diameter of the constriction section gradually decreases, which can guide the main body section into the housing, facilitating the insertion of the battery cell into the housing.

[0018] In an embodiment of the present application, the inner diameter D of the housing satisfies the conditions: D = Da = Db, D - D1 > the insertion gap into the housing, -0.1 mm < D - D2 < the insertion gap into the housing, D - D3 > the insertion gap into the housing; where D3 is the outer diameter of the end of the constriction section away from the main body section, and the insertion gap into the housing is 0 to 0.5 mm.

[0019] In the above technical solution, by providing that the outer diameter D1 of the first insulating layer and the inner diameter D of the housing satisfy D - D1 > the insertion gap into the housing, it is convenient for the battery cell to smoothly enter the housing from this side of the first insulating layer; the outer diameter D2 of the main body section satisfies the condition -0.1 mm < D - D2 < the insertion gap into the housing, and the outer diameter D3 of the end of the constriction section away from the main body section satisfies the condition: D - D3 > the insertion gap into the housing, so that after the battery cell together with the first insulating layer and the second insulating layer is pushed into the housing, the main body section of the second insulating layer can reduce the radial gap with the housing, thus solving the problem of the vibration fracture of the connecting piece in the radial direction; by providing that the insertion gap into the housing is 0 to 0.5 mm, if the insertion gap into the housing exceeds 0.5 mm, it will cause loss of capacity space, and if the insertion gap into the housing is less than 0 mm, it will be difficult for the battery cell to enter the housing.

[0020] In an embodiment of the present application, from one end of the constriction section to the opposite end, the constriction section is in a straight transition, a curved transition or a stepped transition.

[0021] In the above technical solution, by providing that the constriction section has different shapes, the diversity of the second insulating layer can be increased, facilitating the user to select according to their own needs.

[0022] In an embodiment of the present application, the length of the main body section is greater than or equal to 5 mm.

[0023] In the above technical solution, the length of the main body section being greater than or equal to 5 mm ensures a certain interference length to achieve the function of fixing the battery cell. If the length of the main body section is less than 5 mm, the fixing effect will become smaller or even fail to play a fixing role.

[0024] In an embodiment of the present application, the battery single body is cylindrical.

[0025] In the above technical solution, by providing that the battery single body is cylindrical, that is, setting the battery single body to a regular shape, it is easy to prepare the battery single body and easy to set the relevant parameters of the battery single body.

[0026] In one embodiment of the present application, the battery cell is cylindrical; the shell includes a hollow cylinder with at least one end being an open end; and the battery cell further includes an end cover covering the open end.

[0027] In the above technical solution, the battery cell is designed to be cylindrical. By designing the battery cell to be cylindrical, the fewer edges and corners can facilitate the insertion of the battery cell into the shell and facilitate the design of relevant parameters.

[0028] In one embodiment of the present application, the battery cell includes a battery cell body and a first pole tab and a second pole tab. The first pole tab and the second pole tab have opposite polarities. The first insulating layer covers the first pole tab, and the second insulating layer covers the second pole tab.

[0029] In the above technical solution, the first insulating layer covers the first electrode tab, and the second insulating layer covers the second electrode tab, which can reduce the risk of short circuit caused by contact between the first electrode tab and the second electrode tab and the metal shell.

[0030] In one embodiment of the present application, the first insulating layer is bonded to the battery core; and / or the second insulating layer is bonded to the battery core.

[0031] In the above technical solution, the first insulating layer and / or the second first insulating layer are bonded to the battery core to improve the reliability of the battery cell.

[0032] In one embodiment of the present application, the first insulating layer and the second insulating layer are an integral structure.

[0033] In the above technical solution, since the first insulating layer and the second insulating layer are an integrated structure, the insulating layer only needs to be attached once to set the insulating layer at the first and second ends of the battery cell, which saves time and effort, is easy to operate, and the large-size insulating layer is easier to produce.

[0034] In order to solve the above technical problems, another technical solution adopted in the present application is: providing a battery cell, comprising: a shell, a battery cell, a first insulating layer and a second insulating layer, wherein the battery cell is accommodated in the shell and has a first end and a second end relative to each other; at least a portion of the first insulating layer is arranged on the outer side surface of the first end of the battery cell; at least a portion of the second insulating layer is arranged on the outer side surface of the second end of the battery cell; the inner diameter of the shell gradually decreases along the direction from the first end to the second end of the battery cell; the outer surfaces of the first insulating layer and the second insulating layer are both arranged to fit the inner surface of the shell.

[0035] In the above technical solution, since the inner diameter of the shell changes gradually, when the first insulating layer guides the battery cell into the shell, it enters from the side with the larger inner diameter of the shell to the side with the smaller inner diameter of the shell. The outer surfaces of the first insulating layer and the second insulating layer are both fitted with the inner surface of the shell so that the first insulating layer and the second insulating layer respectively clamp the second end and the first end of the battery cell in the shell, which can play a restraining role on both ends of the battery cell.

[0036] In one embodiment of the present application, the outer diameter of the battery cell body is designed to be the same, and the thickness of the second insulating layer is less than the thickness of the first insulating layer.

[0037] In the above technical solution, since the inner diameter of the shell changes gradually, when the first insulating layer guides the battery cell into the shell, it enters from the side with the larger inner diameter of the shell to the side with the smaller inner diameter of the shell. The outer surfaces of the first insulating layer and the second insulating layer are both fitted with the inner surface of the shell so that the first insulating layer and the second insulating layer respectively clamp the second end and the first end of the battery cell in the shell, which can play a restraining role on both ends of the battery cell.

[0038] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide a battery, comprising: the battery cell provided in any of the above embodiments.

[0039] In the above technical solution, by setting Da-D1>Db-D2, the difference between the inner diameter of the shell and the outer diameter of the first insulating layer is larger, that is, the gap between the first insulating layer and the shell is larger, which can facilitate the insertion of the battery cell into the shell, while the difference between the inner diameter of the shell and the outer diameter of the main section is smaller, which is beneficial to reduce the shaking of the battery cell in the shell.

[0040] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide an electrical device, comprising a battery cell provided by any of the above embodiments.

[0041] In the above technical solution, by setting Da-D1>Db-D2, the difference between the inner diameter of the shell and the outer diameter of the first insulating layer is larger, that is, the gap between the first insulating layer and the shell is larger, which can facilitate the insertion of the battery cell into the shell, while the difference between the inner diameter of the shell and the outer diameter of the main section is smaller, which is beneficial to reduce the shaking of the battery cell in the shell.

Brief Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] FIG1 is an exploded view of a battery cell provided in some embodiments of the present application.

[0044] FIG. 2 is a top view of the battery cell in FIG. 1 .

[0045] FIG3 is a schematic cross-sectional view of the battery cell along line III-III in FIG1 and FIG2 .

[0046] FIG4 is a simplified structural diagram of the battery shell, the battery cell, the first tab adhesive layer, and the second tab adhesive layer in the battery cell of FIG3 .

[0047] FIG5 is a schematic cross-sectional view along line VV in FIG4 .

[0048] FIG6 is a simplified structural diagram of a battery cell provided in some other embodiments of the present application.

[0049] FIG. 7 is a schematic structural diagram of a second tab adhesive layer provided in some embodiments of the present application.

[0050] FIG8 is a schematic structural diagram of the second tab adhesive layer provided in some other embodiments of the present application.

[0051] FIG9 is a schematic structural diagram of the second tab adhesive layer provided in some other embodiments of the present application.

[0052] FIG10 is a top view of a battery cell provided in some other embodiments of the present application.

[0053] FIG11 is a schematic cross-sectional view along line XI-XI in FIG11 .

[0054] FIG12 is a simplified structural diagram of the battery shell, the battery cell, the first tab adhesive layer, and the second tab adhesive layer in the battery cell of FIG11 .

[0055] FIG13 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application.

[0056] FIG14 is a simplified structural diagram of the battery shell, battery core, and second tab adhesive layer in the battery cell of FIG13 .

[0057] FIG15 is a simplified structural diagram of a battery cell provided in some other embodiments of the present application.

[0058] FIG16 is a schematic diagram of the structure of a battery provided in some embodiments of the present application.

[0059] FIG17 is a schematic structural diagram of an electrical device provided in some embodiments of the present application.

[0060] The accompanying drawings in the specific implementation manner are as follows:

[0061] Battery cell 1, shell 10, battery cell 20, battery cell body 21, first insulating layer 30, second insulating layer 40, main section 41, contraction section 42, positive electrode top cover 50, negative electrode top cover 60, finishing glue layer 70, battery 100, box 2, cover 201, hollow structure 202, electrical device 1000. [Specific implementation method]

[0062] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0064] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0065] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the term "multiple" means more than two (including two). Similarly, "multiple groups" means more than two (including two groups), and "multiple pieces" means more than two (including two pieces), unless otherwise clearly and specifically defined.

[0066] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0067] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0068] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0069] Batteries are a common charging and discharging product that has been widely used in daily life and industrial production. This application is an improvement to battery technology. The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack.

[0070] During their research, the inventors of this application discovered that during the production of battery cells, the battery cells need to be installed in a casing. To ensure smooth installation, the outer diameter of the battery cells is typically smaller than the inner diameter of the casing, leaving a clearance for easy insertion. However, this can cause the battery cells to move radially in the casing, which can easily cause the adapter to break after vibration and impact, leading to adapter failure.

[0071] In order to enable the battery cell to meet the requirements of being inserted into the shell while avoiding the problem of the adapter plate breaking due to the movement of the chip in the shell, the inventor of this application has found that by reducing the difference between the outer diameter of the insulating layer at one end of the battery cell and the inner diameter of the shell, the shaking of the battery cell in the radial direction of the shell can be reduced.

[0072] Based on the above considerations, the inventors of this application have designed a method for providing a first insulating layer and a second insulating layer at each end of the battery cell. This method reduces the difference between the outer diameter of the second insulating layer and the inner diameter of the casing. The first insulating layer serves to guide the battery cell into the casing, and the second insulating layer, once inserted into the casing along with the first insulating layer, reduces the radial movement of the battery cell within the casing. This is described below with reference to the accompanying drawings.

[0073] Some embodiments of the present application provide a battery cell, see Figures 1-4, the battery cell 1 includes a shell 10, a battery cell 20, a first insulating layer 30 and a second insulating layer 40, wherein the battery cell 20 is accommodated in the shell 10, the battery cell 20 has a first end and a second end opposite to each other, the first insulating layer 30 is at least partially disposed on the outer side surface of the first end of the battery cell 20, and the second insulating layer 40 is at least partially disposed on the outer side surface of the second end of the battery cell 20. The second insulating layer 40 includes a main body segment 41. The inner diameter of the shell 10 at the corresponding position of the first insulating layer 30 is Da, the outer diameter of the first insulating layer 30 is D1, the inner diameter of the shell 10 at the corresponding position of the main body segment 41 is Db, the outer diameter of the main body segment is D2, and Da-D1>Db-D2.

[0074] Among them, the shell 10 is used to cover or accommodate the battery cell 20, etc., and can protect the battery cell 20, thereby preventing the battery cell 20 from being contaminated by the outside. The shape of the shell 10 can be determined according to the specific shape and size of the battery cell 20. The shell 10 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 10 can be determined according to the specific shape and size of the battery cell 20. The embodiment of the present application is introduced by taking the battery cell 1 as a cylindrical example.

[0075] The shell 10 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0076] The inner diameter of the shell 10 refers to the size of the inner space of the shell 10 in a direction perpendicular to the length of the battery cell 20. In the present application, when the inner space of the shell 10 is cylindrical or frustum-shaped, the inner diameter refers to the diameter of the inner space of the shell 10. The inner diameter of the shell 10 can be obtained by an inner diameter measuring device. The inner diameter measuring device is not limited. For example, it can be a micrometer or a vernier caliper. There are two ways to use the micrometer: one is to take a reading when the force measurement makes a "click" sound or gently shake the scale frame. Then, the user feels that the two measuring surfaces are in good contact with the measured surface, and then reverses the differential cylinder to remove the micrometer; the other is to adjust the micrometer, lock the micrometer with a locking device, and remove the micrometer to read the reading. Of course, it is understandable that the inner diameter measuring device can also be other devices, such as a laser diameter gauge.

[0077] The inner diameter Da of the housing 10 at the position corresponding to the first insulating layer 30 refers to the inner diameter of the surface of the inner wall of the housing 10 that faces the first insulating layer 30 in the radial direction of the housing. The inner diameter Db of the housing 10 at the position corresponding to the main body section 41 refers to the inner diameter of the surface of the inner wall of the housing 10 that faces the main body section 41 in the radial direction of the housing.

[0078] The battery cell 20 is the component in the battery cell 1 where the electrochemical reaction occurs. The battery cell 20 may include a battery cell body 21 and a first tab 22 and a second tab 23. The first tab 22 and the second tab 23 have opposite polarities. For example, in some embodiments, the first tab 22 may be a positive tab and the second tab 23 may be a negative tab. In other embodiments, the first tab 22 may be a negative tab and the second tab 23 may be a positive tab.

[0079] Specifically, the battery cell 20 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. As an example, the separator can be a diaphragm. The material of the diaphragm can be PP (polypropylene) or PE (polyethylene).

[0080] As an example, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector, and the current collector not coated with the positive electrode active material layer serves as the positive electrode tab. In some embodiments of the present application, the end of the battery cell 20 where the positive electrode tab is located is the first end of the battery cell 20. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0081] As an example, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector, and the portion of the current collector not coated with the negative electrode active material layer serves as the negative electrode tab. In some embodiments of the present application, the end of the battery cell 20 where the negative electrode tab is located is the second end of the battery cell 20. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon, silicon, or the like.

[0082] As an example, the positive electrode tab and the negative electrode tab are flattened. In addition, the battery cell 20 can be a wound structure or a laminated structure. The embodiment of the present application is described using the battery cell 20 as an example of a wound structure.

[0083] In some embodiments, the end where the negative electrode tab is located may be the first end of the battery cell 20 , and the end where the positive electrode tab is located may be the second end of the battery cell 20 .

[0084] The first insulating layer 30 and the second insulating layer 40 are used to reduce the risk of short circuits caused by contact between the positive and negative electrode tabs and the metal casing 10. The first insulating layer 30 and / or the second insulating layer 40 have a certain degree of adhesiveness, allowing them to adhere to the battery cell 20. In some embodiments, at least a portion of the first insulating layer 30 and at least a portion of the second insulating layer 40 can be respectively bonded around the outer side of the positive and negative electrode tabs. This improves the reliability of the battery cell 1 by adhering the first insulating layer 30 and the second insulating layer 40 to the battery cell 20 during packaging. The main section 41 is the main portion of the second insulating layer 40 that prevents the tabs from contacting the metal casing 10. The outer diameter D1 of the first insulating layer 30 refers to the dimension of the outermost surface of the first insulating layer 30 perpendicular to the length of the battery cell 20. The outer diameter D2 of the main section 41 refers to the dimension of the outermost surface of the main section 41 perpendicular to the length of the battery cell 20. If the first insulating layer 30 and the second insulating layer 40 are cylindrical, the outer diameter refers to the outer diameter. Referring to Figure 5 , if the insulating layer is cylindrical and partially stacked at both ends of the circumference, the outer diameter at the stacked position refers to the sum of the outer diameter and the thickness of the insulating layer; the outer diameter at other locations refers to the outer diameter. The outer diameter of the first insulating layer 30 or the second insulating layer 40 in this application can be obtained using an outer diameter measuring device. The outer diameter measuring device is not limited to any device and can be, for example, a vernier caliper. The measurement method is to place the first outer measuring jaw of the vernier caliper against the outside of the first insulating layer 30 or the second insulating layer 40 and hold it stationary. Then, move the second outer measuring jaw so that the first and second outer measuring jaws clamp the first insulating layer 30 or the second insulating layer 40. The corresponding value of the second outer measuring jaw on the main scale is read to obtain the outer diameter.

[0085] In some embodiments, the first insulating layer 30 can be a hollow cylindrical structure. Specifically, in one embodiment, the first insulating layer 30 is a hollow cylindrical structure and is at least partially disposed on the outer side of the first end of the battery cell 20. In some embodiments, at least a portion of the first insulating layer 30 is coated on the outer side of the positive electrode tab. The battery cell 20 can be installed into the housing 10 through the first insulating layer 30, that is, the battery cell 20 enters the housing 10 from the side of the first insulating layer 30. After insertion, the first insulating layer 30 is located between the battery cell 20 and the housing 10.

[0086] Furthermore, in order to allow the battery cell 20 to be smoothly inserted into the shell and to reduce the shaking of the battery cell 20 in the radial direction of the shell 10, the inner diameter Da of the shell 10 corresponding to the first insulating layer 30, the outer diameter D1 of the first insulating layer 30, the inner diameter Db of the shell 10 corresponding to the main section 41, and the outer diameter D2 of the main section 41 meet the condition: Da-D1>Db-D2. It should be noted that the outer diameters of the first insulating layer 30 and the second insulating layer 40 of the components in the embodiment of the present application (including the outer diameter of the main section 41 and the outer diameter of the contraction section 42 described below) refer to the outer diameters of the first insulating layer 30 and the second insulating layer 40 in the natural state (i.e., non-compressed state) at room temperature (25 degrees Celsius) before being installed in the shell 10. For the case of non-interference fit, the outer diameters of the first insulating layer 30 and the second insulating layer 40 after being removed from the shell 10 are basically the same as the outer diameters before being installed in the shell 10. Because the main body section 41 has an interference fit with the housing 10, it may be deformed or contracted by compression after being installed in the housing 10. The outer diameter of the main body section 41 after installation in the housing 10 decreases and becomes equal to the inner diameter of the housing 10. Under certain conditions, such as if the main body section 41 can return to its pre-installation state after being removed from the housing 10, the outer diameter of the main body section 41 in its natural state after removal from the housing 10 can be used as the outer diameter of the main body section 41 before installation in the housing 10. Under other conditions, such as if the main body section 41 cannot fully return to its pre-installation state after being removed from the housing 10, the outer diameter of the main body section 41 before installation in the housing 10 can be estimated based on the material properties of the main body section 41 and experimental results. Since the housing 10 is generally made of metal and may expand and contract with temperature, the inner diameter (outer diameter) of the housing 10 refers to the inner diameter (outer diameter) of the housing 10 in its natural state at room temperature (25 degrees Celsius). The inner diameter (outer diameter) of the housing 10 is substantially unaffected by the installation of the battery cell 20, the first insulating layer 30, and the second insulating layer 40. In this way, the difference between the inner diameter of the shell 10 and the outer diameter of the first insulating layer 30 is large, that is, the gap between the first insulating layer 30 and the shell 10 is large, which can facilitate the insertion of the battery cell 20 into the shell. The difference between the inner diameter of the shell 10 and the outer diameter of the main body section 41 is small, which is beneficial to reduce the shaking of the battery cell 20 in the shell 10.

[0087] In the above embodiment of the present application, by setting Da-D1>Db-D2, the difference between the inner diameter Da of the shell 10 and the outer diameter D1 of the first insulating layer 30 is large, that is, the gap between the first insulating layer 30 and the shell 10 is large, which can facilitate the insertion of the battery cell 20 into the shell, and the difference between the inner diameter Db of the shell 10 and the outer diameter D2 of the main section 41 is small, which is beneficial to reduce the shaking of the battery cell 20 in the shell 10.

[0088] In some of these embodiments, the main body section 41 can be in interference fit with the housing 10. An interference fit means that by utilizing the elasticity of the material of the main body section 41, it is compressed and deformed to enter the housing 10. When the material of the main body section 41 restores, an extrusion force is generated on the housing 10, causing the main body section 41 and the housing 10 to abut. In this way, the main body section 41 can better restrain the battery cell 20, which is beneficial to reducing the shaking of the battery cell 20 within the housing 10.

[0089] Optionally, in some embodiments, the inner diameter Db at the corresponding position of the housing 10 and the outer diameter D2 of the main body section 41 satisfy the condition: 0 < D2 - Db < 0.1 mm, such that the corresponding position of the main body section 41 and the housing 10 can satisfy the interference fit and there will be no situation where the main body section 41 cannot be pushed into the housing 10 due to the excessive outer diameter D2 of the main body section 41.

[0090] Optionally, in some embodiments, Da - D1 > 0, Db - D2 ≥ 0, that is to say, after the battery cell 20 is inserted into the housing, there is a gap between the first insulating layer 30 and the housing 10, and there is also a gap or the gap is 0 between the second insulating layer 40 and the housing 10, thus preventing the outer diameters of the first insulating layer 30 and the second insulating layer 40 from being too large to prevent the battery cell 20 from being smoothly inserted into the housing.

[0091] The battery cell 20 can include a battery cell body 21, a first tab 22 and a second tab 23, and the polarities of the first tab 22 and the second tab 23 are opposite.

[0092] In some embodiments, the housing 10 has a constant inner diameter design, the battery cell body 21 has a constant outer diameter design, and the thickness of the main body section 41 is greater than the thickness of the first insulating layer 30.

[0093] The battery cell body 21 refers to the area of the battery cell 20 where the positive active material and the negative active material are provided.

[0094] Among them, the housing 10 having a constant inner diameter design means that along the length direction of the housing 10, the inner diameter of the housing remains unchanged. The battery cell body 21 having a constant outer diameter design means that along the length direction of the battery cell body 21, the outer diameter of the battery cell body 21 remains unchanged. When the housing 10 is a hollow cylinder and the battery cell body 21 is a cylinder, the housing 10 having a constant inner diameter design means that the diameter of the internal space of the housing remains unchanged, and the battery cell body 21 having a constant outer diameter design means that the outer diameter of the battery cell body 21 remains unchanged.

[0095] The constant inner diameter does not require the inner diameter at each part of the housing 10 to be strictly equal, and it can fluctuate within the error range.

[0096] The constant outer diameter does not require the outer diameter at each part of the battery cell body 21 to be strictly equal, and it can fluctuate within the error range.

[0097] In other embodiments, the inner diameter of the shell 10 gradually decreases from the first end to the second end of the battery cell 20 , the outer diameter of the battery cell body 21 is designed to be the same, and the thickness of the main section 41 is equal to the thickness of the first insulating layer 30 .

[0098] Specifically, referring to Figures 3 and 4, in some embodiments, the inner diameter of the shell 10 is designed to be equal, that is, the inner diameter D=Da=Db of the shell 10, and the outer diameter of the battery cell body 21 is designed to be equal, and the thickness of the main section 41 is greater than the thickness of the first insulating layer 30. In this way, after the first insulating layer 30 guides the battery cell 20 into the shell, the gap between the main section 41 and the shell 10 is smaller than the gap between the first insulating layer 30 and the shell 10, which is beneficial to reduce the shaking of the battery cell 20 in the shell 10.

[0099] Optionally, in other embodiments, the shell 10 is designed with a non-uniform inner diameter, and the battery cell body 21 can be designed with a uniform outer diameter. Specifically, referring to FIG6 , the inner diameter of the shell 10 gradually decreases along the direction from the first end to the second end of the battery cell 20. The thickness of the main section 41 is equal to the thickness of the first insulating layer 30. Since the inner diameter of the shell 10 gradually changes, when the first insulating layer 30 guides the battery cell 20 into the shell, it enters from the side with the larger inner diameter of the shell 10 to the side with the smaller inner diameter of the shell 10. The thickness of the main section 41 is equal to the thickness of the first insulating layer 30, so that the first insulating layer 30 clamps the second end of the battery cell 20 in the shell 10, which restrains the battery cell 20 and helps to reduce the shaking of the battery cell in the shell.

[0100] In some embodiments, referring to Figures 3 and 4 , the housing 10 has a uniform inner diameter, and the second insulating layer 40 further includes a constricted section 42 connected to the main section 41. The constricted section 42 is located relative to the main section 41. The constricted section 42 is located on the side of the main section 41 that is closest to the first insulating layer 30. The outer diameter of the constricted section 42 gradually decreases from the second end to the first end of the battery cell 20.

[0101] Specifically, the constricted section 42 is used to guide the main section 41 into the housing 10, facilitating the insertion of the battery cell 20. To achieve the transition between the constricted section 42 and the main section 41, the outer diameter D3 of the constricted section 42 gradually decreases from the connection between the constricted section 42 and the main section 41 in a direction away from the main section 41, that is, it gradually decreases along the direction from the second end to the first end of the battery cell 20. Therefore, when the battery cell 20 is pushed from the first insulating layer 30 into the housing 10, the portion of the constricted section 42 with the smallest outer diameter enters the housing 10 first, facilitating the advancement of the second insulating layer 40. The gradual transition from the constricted section 42 to the main section 41 facilitates guiding the main section 41 into the housing 10.

[0102] In some embodiments, the contraction section 42 transitions from one end to the opposite end in a straight line, a curve, or a stepwise manner. For details, please refer to Figures 7-9.

[0103] Further, in some embodiments, the inner diameter D of the housing 10 satisfies the conditions: D = Da = Db, D - D1 > the gap for entering the housing, -0.1 mm < D - D2 < the gap for entering the housing, and D - D3 > the gap for entering the housing. D3 is the outer diameter of the end of the contraction section 42 away from the main body section 41, and the gap for entering the housing is 0 to 0.5 mm.

[0104] Specifically, in order for the battery cell 20 to smoothly enter the housing 10 through the first insulating layer 30, the difference between the inner diameter D of the housing 10 and the outer diameter D1 of the first insulating layer 30 is greater than the gap for entering the housing, that is, it satisfies: D - D1 > the gap for entering the housing. Further, the difference between the inner diameter D of the housing 10 and the outer diameter D3 of the end of the contraction section 42 away from the main body section 41 is greater than the gap for entering the housing, that is, it satisfies the condition: D - D3 > the gap for entering the housing. Therefore, the minimum outer diameter of the contraction section 42 is smaller than the outer diameter of the first insulating layer 30, which is beneficial for the contraction section 42 to guide the main body section 41 to smoothly enter the housing 10. In some embodiments of the present application, the main body section 41 is a hollow columnar structure. Specifically, the main body section 41 is a hollow cylindrical structure. The difference between the inner diameter D of the housing 10 and the outer diameter D2 of the main body section 41 is greater than -0.1 mm and less than the gap for entering the housing, that is, it satisfies the condition -0.1 mm < D - D2 < the gap for entering the housing, which means that the outer diameter D2 of the main body section 41 is larger than the outer diameter D1 of the first insulating layer 30. Therefore, the battery cell 20 can be better constrained. Among them, the difference between the inner diameter D of the housing 10 and the outer diameter D2 of the main body section 41 can be negative, which means that the housing 10 and the main body section 41 are in interference fit. For example, when the difference between the inner diameter D of the housing 10 and the outer diameter D2 of the main body section 41 is -0.08, after the main body section 41 is taken out of the housing 10, the difference between the inner diameter D of the housing 10 and the outer diameter D2 of the main body section 41 is -0.08. It should be noted that the gap for entering the housing in the present application refers to the gap reserved in advance for facilitating the entry of the battery cell 20 into the housing 10, and can be specifically designed according to the accuracy of the process of entering the housing. In some embodiments, the range of the gap for entering the housing is 0 to 0.5 mm. For example, 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm or 0.45 mm, etc. If the gap for entering the housing is too large, such as exceeding 0.5 mm, it will cause loss of capacity space. If the gap for entering the housing is too small, such as less than 0 mm, it will cause the battery cell 20 to be difficult to enter the housing 10. Preferably, the range of the gap for entering the housing is 0.2 to 0.5 mm. If the gap for entering the housing is too large, such as exceeding 0.5 mm, it will cause loss of capacity space. If the gap for entering the housing is too small, such as less than 0.2 mm, it will cause the battery cell 20 to be difficult to enter the housing 10 without being damaged.

[0105] In the above embodiments of the present application, by setting the outer diameter D1 of the first insulating layer 30 and the inner diameter D of the housing 10 to satisfy D - D1 > the shell entry gap, it is convenient for the battery cell 20 to smoothly enter the shell from this side of the first insulating layer 30. At the same time, the second insulating layer 40 is provided to include a main body segment 41 and a contraction segment 42 that are connected to each other, and the contraction segment 42 is located on the side of the main body segment 41 close to the first insulating layer 30; the outer diameter D2 of the main body segment 41 satisfies the condition -0.1 mm < D - D2 < the shell entry gap; along the direction from the second end to the first end of the battery cell 20, the outer diameter D3 of the contraction segment 42 gradually decreases, and the outer diameter D3 of the end of the contraction segment 42 far from the main body segment 41 satisfies the condition: D - D3 > the shell entry gap. After the battery cell 20 together with the first insulating layer 30 and the second insulating layer 40 is pushed into the housing 10, the main body segment 41 of the second insulating layer 40 can顶住 the housing 10, reducing the radial gap, which is beneficial to reducing the晃动 of the battery cell in the shell and thus beneficial to solving the problem of the vibration fracture of the转接片 in the radial direction.

[0106] In addition, in some embodiments, the length L1 of the main body segment 41 is greater than or equal to 5 mm. For example, 5.2 mm, 5.5 mm, 5.8 mm, 6 mm, 6.2 mm, 6.5 mm, 6.8 mm or 7 mm, etc. There is no specific limitation here and it can be set according to needs. If the length L1 of the main body segment 41 is less than 5 mm, then the length of the main body segment 41 fitting the battery cell 20 will be too short, and its binding effect will become smaller or even失效.

[0107] In some embodiments, the overall length of the contraction segment 42 is L2, and the length of the part of the contraction segment 42 that satisfies the condition D - D3 > the shell entry gap is greater than 2 mm, so that the contraction segment 42 can better guide the main body segment 41 into the shell, otherwise the transition effect of the contraction segment 42 will失效. It should be noted that the length of the main body segment 41 refers to the distance along the axis from one end to the opposite end of the main body segment 41 when the main body segment 41 is coaxially arranged with the housing 10 after entering the housing 10.

[0108] In some embodiments, the battery cell 1 is columnar. It can be understood that the shape of the battery cell 1 of the present application is not limited, and it can be columnar or other shaped battery cells. However, setting the battery cell as columnar, that is, setting the battery cell as a regular shape, is easy for the preparation of the battery cell and easy to set the relevant parameters of the battery cell; the first insulating layer 30 and the second insulating layer 40 can also include an ear tab glue layer or a finishing glue layer, etc., as long as it can play the role of isolating the housing 10 from the battery cell 20.

[0109] It should be noted that, in order to better wrap the first insulating layer 30 around the outer side surface of the battery cell 20 and prevent the first end side 31 and the second end side 32 of the first insulating layer 30 from disconnecting at the connection, in some embodiments of the present application, the first end side 31 and the second end side 32 of the first insulating layer 30 are at least partially overlapped at the connection. Specifically, please refer to FIG. 5.

[0110] At least part of the second insulating layer 40 is disposed on the outer side surface of the second end of the battery cell 20. In some embodiments, at least part of the second insulating layer 40 wraps around the outer side surface of the negative electrode tab and is used to cooperate with the housing 10 to bind the battery cell 20 in the housing 10, reducing the shaking of the battery cell 20 in the housing 10 in the radial direction of the housing 10. Further, the main body section 41 is disposed between the battery cell 20 and the housing 10 and is used to bind the battery cell 20 in the housing 10, which is beneficial to reducing the shaking of the battery cell 20 in the housing 10. It can be understood that the first insulating layer 30 in the present application can also wrap around the second end of the battery cell 20, that is, wrap around the outer side surface of the negative electrode tab, and the second insulating layer 40 can also be at the first end of the battery cell 20, that is, wrap around the outer side surface of the positive electrode tab. In this case, the battery cell 20 enters the housing from the second end side.

[0111] In some embodiments, the outer diameter D2 of the main body section 41 is equal to the inner diameter Db at the corresponding position of the housing 10 and the main body section 41, that is, Db - D2 = 0. Therefore, after the battery cell 20 enters the housing, the main body section 41 just engages with one end of the housing 10, which neither causes waste of the material of the second insulating layer 40 nor ensures that the main body section 41 and the housing 10 can cooperate well to bind the battery cell 20. In other embodiments, the inner diameter Db at the corresponding position of the housing 10 and the main body section 41 is greater than the outer diameter D2 of the main body section 41. Specifically, the difference between the inner diameter D of the housing 10 and the outer diameter D2 of the main body section 41 is less than 0.4 mm, that is, the condition 0 < Db - D2 < 0.4 mm is satisfied. This is because if the difference between the inner diameter Db at the corresponding position of the housing 10 and the main body section 41 and the outer diameter of the main body section 41 is too large, such as exceeding 0.4 mm, it will not play a role in binding the battery cell 20 and will cause the function of the main body section 41 to fail.

[0112] In some embodiments, referring again to FIG. 1 , a battery cell 1 includes an end cap. The end cap can be used in conjunction with the housing 10 to form an internal environment for the battery cell 1. This internal environment can be used to accommodate the battery cell 20, the first insulating layer 30, the second insulating layer 40, the electrolyte, and / or other components. The end cap herein refers to a component that covers the open end of the housing 10 to isolate the internal environment of the battery cell 1 from the external environment. The shape of the end cap can be adapted to the shape of the housing 10 to fit the housing 10. Depending on the electrode to which the end cap is connected, the end cap can be divided into a positive electrode cap 50 and a negative electrode cap 60. The positive electrode cap 50 is electrically connected to the positive electrode sheet of the battery cell 20, and the negative electrode cap 60 is electrically connected to the negative electrode sheet of the battery cell 20. Optionally, the end cap can be made of a material with a certain hardness and strength (such as an aluminum alloy). This makes the end cap less susceptible to deformation during compression and collision, thereby providing the battery cell 1 with greater structural strength and improved safety. Functional components such as electrode terminals may be provided on the end cap. The electrode terminal may be used to electrically connect to the battery cell 20 through a transition piece for outputting or inputting electrical energy from the battery cell 1. Correspondingly, the electrode terminal connected to the positive electrode tab is the positive electrode terminal, and the electrode terminal connected to the negative electrode tab is the negative electrode terminal. The material of the end cap may also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap, and the insulating member may be used to isolate the electrical connection components in the housing 10 from the end cap to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc.

[0113] In some embodiments, the housing 10 and the end caps may be separate components. An opening may be provided in the housing 10, and the end caps may be closed over the opening to form the internal environment of the battery cell 1. Alternatively, the end caps and the housing 10 may be integrated or interconnected. For example, the end caps and the housing 10 may form a common connection surface before other components are inserted into the housing. When the interior of the housing 10 needs to be encapsulated, the end caps may be closed over the housing 10.

[0114] In some embodiments, the battery cell 20 is cylindrical; the housing 10 comprises a hollow cylinder with at least one open end; and the battery cell 1 includes an end cap covering the open end. This solution employs a cylindrical design for the battery cell 1. This cylindrical design facilitates the insertion of the battery cell into the housing due to its reduced angularity and facilitates the design of relevant parameters.

[0115] In some embodiments, the battery cell 20 may include a battery cell body 21 and a first tab 22 and a second tab 23. The first tab 22 and the second tab 23 have opposite polarities. A first insulating layer 30 covers the first tab 22, and a second insulating layer 40 covers the second tab 23. This solution can reduce the risk of a short circuit caused by contact between the first tab 22 and the second tab 23 and the metal housing 10.

[0116] In some embodiments, the first insulating layer 30 is bonded to the battery cell 20 and / or the second insulating layer 40 is bonded to the battery cell 20. This solution can improve the reliability of the battery cell 1.

[0117] Further, referring to Figures 10-12, the length of the contraction section 42 that meets the condition D-D3>the shell gap is greater than 1 / 2, 2 / 3 or 3 / 4 of the length of the battery cell 20, that is, a gradually transitioning contraction section 42 is provided on a large area of ​​the outer side surface of the battery cell 20. The gradually transitioning contraction section 42 is provided on a large area of ​​the outer side surface of the battery cell 20. On the one hand, the contraction section 42 can guide the main section 41, and on the other hand, the main part of the battery cell 20 can be protected.

[0118] In some embodiments of the present application, the first insulating layer 30 and the second insulating layer 40 are an integral structure.

[0119] Specifically, referring to Figures 13-14, the second insulating layer 40 covers the entire outer side of the battery cell 20. In other words, part of the second insulating layer 40 replaces the first insulating layer 30 and covers the first end of the battery cell 20. Alternatively, it can be considered that the contraction section 42 is connected to the first insulating layer 30 to form a structure, that is, the first insulating layer 30 and the second insulating layer 40 are an integral structure. In this embodiment, since only one tab adhesive layer of unequal thickness is included, the tab adhesive layer only needs to be applied once to provide the tab adhesive layer at both the first and second ends of the battery cell 20. This saves time and effort, is easy to operate, and the large-sized tab adhesive layer is more convenient for production.

[0120] Continuing with FIG1 , the battery cell 1 further includes a finishing adhesive layer 70 , which is used to coat the outer side of the battery cell 20 , preventing the battery cell 20 from spreading out, having a good binding effect, and helping to reduce the shaking of the battery cell in the shell, thereby ensuring the binding force of the diaphragm. It is understandable that in the embodiments corresponding to FIG14-15 , since the second insulating layer 40 coats the entire battery cell 20 , it can play a role in binding the battery cell 20 and preventing the battery cell 20 from spreading out, which is helpful in reducing the shaking of the battery cell in the shell. Therefore, an additional finishing adhesive layer may not be required. Alternatively, it can be understood that the finishing adhesive layer can coat the first and second ends of the battery cell 20 , playing a role in isolating the metal strips of the positive and negative electrode tabs from the metal shell 10 , and therefore the first insulating layer 30 and the second insulating layer 40 may not be required. In other words, in this embodiment, only one tab adhesive layer and one finishing adhesive layer may be provided, which can save material while achieving the purpose of smoothly inserting the battery cell 20 into the shell and stabilizing the battery cell 20 .

[0121] Referring to Figure 15, in some embodiments, the present application provides a battery cell 1. The battery cell 1 includes a shell 10, a battery cell 20, a first insulating layer 30, and a second insulating layer 40. The battery cell 20 is housed in the shell 10, and the battery cell 20 has a first end and a second end opposite to each other. The first insulating layer 30 is at least partially disposed on the outer side surface of the first end of the battery cell 20. The second insulating layer 40 is at least partially disposed on the outer side surface of the second end of the battery cell 20. Along the direction from the first end to the second end of the battery cell 20, the inner diameter of the shell 10 gradually decreases, and the outer surfaces of the first insulating layer 30 and the second insulating layer 40 are both arranged to fit the inner surface of the shell 10. Since the inner diameter of the shell 10 changes gradually, when the first insulating layer 30 guides the battery cell into the shell, it enters from the side with the larger inner diameter of the shell 10 to the side with the smaller inner diameter of the shell 10. The outer surfaces of the first insulating layer 30 and the second insulating layer 40 are both fitted with the inner surface of the shell 10 so that the first insulating layer 30 and the second insulating layer 40 respectively clamp the second end and the first end of the battery cell 20 in the shell 10, which can restrain both ends of the battery cell 20.

[0122] In some embodiments, the outer diameter of the battery cell body 21 is designed to be constant, and the thickness of the second insulating layer 40 is less than that of the first insulating layer 30. Because the inner diameter of the housing 10 gradually changes, when the first insulating layer 30 guides the battery cell into the housing, it enters from the side with the larger inner diameter of the housing 10 to the side with the smaller inner diameter of the housing 10. The outer surfaces of the first insulating layer 30 and the second insulating layer 40 are both arranged to fit the inner surface of the housing 10, so that the first insulating layer 30 and the second insulating layer 40 respectively clamp the second end and the first end of the battery cell 20 within the housing 10, which can restrain both ends of the battery cell 20.

[0123] 16 , some embodiments of the present application provide a battery 100 , which includes a battery cell 1 .

[0124] As an example, the battery 100 includes a housing 2 , and the battery cells 1 are accommodated in the housing 2 .

[0125] The housing 2 is used to accommodate the battery cells 1 and can enclose one or more battery cells 1. The housing 2 prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells 1. The housing 2 can have various structures, including but not limited to: a cover 201 and a hollow structure 202 with an open end, wherein the cover 201 covers the open side of the hollow structure 202 to define a storage space. Of course, the housing 2 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0126] The battery cell 1 is the battery cell 1 provided in the above embodiment. For the specific structure, please refer to the above embodiment and will not be repeated here. There can be multiple battery cells 1, and the multiple battery cells 1 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 1 are both in series and in parallel. The multiple battery cells 1 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 1 is accommodated in the box 2; of course, the battery 100 can also be a battery 100 module formed by connecting multiple battery cells 1 in series, in parallel, or in mixed connection, and the multiple battery 100 modules are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 2. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing electrical connection between the multiple battery cells 1.

[0127] 17 , some embodiments of the present application provide an electrical device 1000 , including the battery 100 provided in the above embodiments.

[0128] The power-consuming device 1000 can be, but is not limited to, a mobile phone, a tablet, a laptop computer, a portable device, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned power-consuming device 1000. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. In some embodiments, the power-consuming device 1000 is a vehicle, which can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle. The battery 100 is the battery 100 described in the above embodiments. The battery 100 can be provided at the bottom, head, or tail of the vehicle. The battery 100 can be used to power the vehicle. For example, the battery 100 can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery 100 to power the motor, for example, to meet the vehicle's power requirements for starting, navigation, and driving. In some embodiments of the present application, the battery 100 can serve not only as the vehicle's operating power source, but also as the vehicle's driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0129] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0130] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery cell, characterized in that: Comprising: A housing; An electric core, housed within the housing, having opposite first and second ends; A first insulating layer, at least partially disposed on the outer side surface of the first end of the electric core; A second insulating layer, at least partially disposed on the outer side surface of the second end of the electric core; the second insulating layer includes a main body section; Wherein, the inner diameter at the position corresponding to the first insulating layer of the housing is Da, the outer diameter of the first insulating layer is D1, the inner diameter at the position corresponding to the main body section of the housing is Db, the outer diameter of the main body section is D2, and Da - D1 > Db - D2.

2. The battery cell according to claim 1, wherein The main body section is in interference fit with the housing.

3. The battery cell according to claim 2, wherein: 0 < D2 - Db < 0.1 mm.

4. The battery cell according to claim 1, wherein: Da - D1 > 0, Db - D2 ≥ 0.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The electric core includes an electric core body, a first tab and a second tab; the first tab and the second tab have opposite polarities; the housing has a constant inner diameter design, the electric core body has a constant outer diameter design, and the thickness of the main body section is greater than the thickness of the first insulating layer; or, Along the direction from the first end to the second end of the electric core, the inner diameter of the housing gradually decreases; the electric core body has a constant outer diameter design, and the thickness of the main body section is equal to the thickness of the first insulating layer.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The housing has a constant inner diameter design, the second insulating layer further includes a shrinkage section connected to the main body section, and the shrinkage section is located on the side of the main body section close to the first insulating layer; along the direction from the second end to the first end of the electric core, the outer diameter of the shrinkage section gradually decreases.

7. The battery cell according to claim 6, wherein: The inner diameter D of the housing satisfies the condition: D = Da = Db, D - D1 > the gap when entering the housing, -0.1 mm < D - D2 < the gap when entering the housing, D - D3 > the gap when entering the housing; wherein, D3 is the outer diameter of the end of the shrinkage section far from the main body section, and the gap when entering the housing is 0 to 0.5 mm.

8. The battery cell according to any one of claims 6 to 7, characterized in that: From one end of the shrinkage section to the opposite end, the shrinkage section is in linear transition, curved transition or stepped transition.

9. The battery cell according to any one of claims 1 to 8, wherein: The length of the main body section is greater than or equal to 5 mm.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The battery cell is columnar.

11. The battery cell according to claim 10, wherein: The electric core is cylindrical; the housing includes a hollow cylinder with at least one open end; the battery cell further includes an end cap covering the open end.

12. The battery cell according to any one of claims 1 to 11, wherein: The electric core includes an electric core body, a first tab and a second tab, the first tab and the second tab have opposite polarities, the first insulating layer covers the first tab, and the second insulating layer covers the second tab.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The first insulating layer is bonded to the electric core; and / or, the second insulating layer is bonded to the electric core.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The first insulating layer and the second insulating layer are of an integral structure.

15. A battery cell, characterized in that: Comprising: A housing; An electric core, housed within the housing, having opposite first and second ends; A first insulating layer, at least partially disposed on the outer side surface of the first end of the electric core; A second insulating layer, at least partially disposed on the outer side surface of the second end of the electric core; Wherein, along the direction from the first end to the second end of the electric core, the inner diameter of the housing gradually decreases; the outer surfaces of the first insulating layer and the second insulating layer are both disposed in contact with the inner surface of the housing.

16. The battery cell according to claim 15, wherein: The electric core body has a constant outer diameter design, and the thickness of the second insulating layer is less than the thickness of the first insulating layer.

17. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 16.

18. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 16.

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