Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, a pole, an electrode assembly and an insulating part; the shell comprises a side wall and a first end wall which are connected with each other; the pole is mounted on the first end wall of the shell in an insulating manner; the electrode assembly is positioned in the shell and comprises a first tab; the first tab faces the first end wall and is electrically connected with the pole; the insulating part comprises a first insulating part and a second insulating part, and the second insulating part surrounds the outer edge of the first insulating part and protrudes towards the side where the electrode assembly is located; the first insulating part is located between the bottom wall and the first tab, and at least one part of the second insulating part is located between the first tab and the side wall.

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 Art

[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] Battery safety is a crucial issue. In some cases, the positive and negative electrodes within a battery are electrically connected to corresponding terminals to extract and transmit electrical energy to a device. Maintaining reliable insulation between conductive pathways of different polarities within the battery cell to prevent short circuits is a pressing issue.

[0004] Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a battery cell, a battery, and an electrical device to improve the reliability of insulation between conductive paths within the battery.

[0006] An embodiment of the first aspect of the present application provides a battery cell. The battery cell includes a housing, a pole, an electrode assembly, and an insulating member. The housing includes connected side walls and a first end wall connected to the side walls; the pole is insulated and mounted on the first end wall; the electrode assembly is located within the housing, the electrode assembly includes a first tab, and the first tab faces the first end wall; the insulating member includes a first insulating portion and a second insulating portion, the second insulating portion being arranged around the outer edge of the first insulating portion and protruding toward the side where the electrode assembly is located. The first insulating portion is located between the first end wall and the first tab, and at least a portion of the second insulating portion is located between the first tab and the side wall.

[0007] In the technical solution of the embodiment of the present application, by arranging an insulating member including a first insulating part and a second insulating part in the shell, insulation between the electrode assembly and the shell can be achieved from different directions, thereby reducing the probability of short circuit risk inside the battery.

[0008] In some embodiments, the second insulating portion includes a guide portion located at an end of the second insulating portion distal from the first insulating portion, with an inner surface of the guide portion inclined toward the sidewall in a direction away from the first insulating portion. The inclined inner surface of the guide portion facilitates the electrode assembly's entry into the accommodating cavity formed by the second insulating portion and connection with the electrode post during assembly.

[0009] In some embodiments, the thickness of the guide portion gradually decreases in a direction away from the first insulating portion. The thickness of the guide portion is set to gradually decrease, which can improve the utilization of the internal space of the housing and reduce the capacity loss of the battery.

[0010] In some embodiments, the second insulating portion includes a connecting portion, the ends of which are respectively connected to the first insulating portion and the guide portion, and the thickness of the connecting portion is greater than or equal to the maximum thickness of the guide portion. The thickness of the connecting portion being greater than or equal to the maximum thickness of the guide portion facilitates the manufacture and processing of the insulating member, reducing the difficulty of manufacturing and processing. Furthermore, the relatively thin thickness of the guide portion of the second insulating portion reduces the space occupied within the housing.

[0011] In some embodiments, the difference between the thickness of the connecting portion and the thickness of the first insulating portion is less than or equal to 0.2 mm. Limiting the thickness difference to within 0.2 mm facilitates the manufacturing and processing of the insulating member and can also alleviate the adverse effects of sudden thickness changes on strength.

[0012] In some embodiments, the thickness of the connecting portion is less than that of the first insulating portion. Setting the thickness of the connecting portion of the second insulating portion to be less than that of the first insulating portion can minimize the space occupied by the second insulating portion in the housing and reduce battery capacity loss.

[0013] In some embodiments, the thickness of the connecting portion is equal to the thickness of the first insulating portion. The thickness of the connecting portion is equal to the thickness of the first insulating portion, which is conducive to integral molding and reduces manufacturing time. The consistent thickness also helps to ensure the structural strength of the connection.

[0014] In some embodiments, the electrode includes a body, and first and second fixing portions, respectively, located at opposite ends of the body. The first fixing portion is located on a side of a first end wall facing the electrode assembly, and the second fixing portion is located on a side of the first end wall facing away from the electrode assembly. The first end wall is provided with a mounting through-hole, and the body is at least partially received within the mounting through-hole. The first and second fixing portions are configured to clamp a portion of the first end wall. The battery cell further includes a current collecting member, at least a portion of which is located between the first tab and the first fixing portion and is electrically connected to the first tab and the first fixing portion, respectively. A portion of the first insulating portion is located between the first fixing portion and the first end wall. This embodiment can provide a clamping force on the first insulating portion, thereby achieving more reliable insulation and making the internal structure of the battery more compact, thereby reducing the space occupied by the battery housing and reducing capacity density loss.

[0015] In some embodiments, the electrode assembly further includes a main body, to which the first tab is connected. The main body includes an active material region and an insulating region, with the insulating region located between the active material region and the first tab. Providing the insulating region can reduce the risk of burr short circuits, prevent short circuits caused by overlapping positive and negative electrodes, reduce direct contact between the positive electrode material and the electrolyte in the battery, and improve battery performance.

[0016] In some embodiments, the connection portion does not extend beyond the end of the insulating region near the first end wall, along the direction from the first end wall toward the electrode assembly. This embodiment allows the thicker connection portion of the second insulating portion to avoid the insulating region, alleviating compression of the electrode assembly when the second insulating portion is disposed between the electrode assembly and the sidewall, thereby reducing loss of capacity density.

[0017] In some embodiments, along the thickness direction of the first end wall, the length h1 of the connection portion, the thickness t1 of the first fixing portion, the thickness t2 of the current collecting member, and the height t3 of the first tab satisfy the following relationship: h1 ≤ t1 + t2 + t3. This design allows the connection portion to be staggered with the main body of the electrode assembly, alleviating the compression of the electrode assembly by the second insulating portion and reducing the loss of capacity density.

[0018] In some embodiments, the guide portion does not extend beyond the end of the insulating region proximal to the active material region, along the first end wall toward the electrode assembly. This embodiment allows the guide portion to be staggered with the active material region, thereby alleviating the pressure of the second insulating portion on the active material region of the main body of the electrode assembly and reducing capacity density loss.

[0019] In some embodiments, along the thickness direction of the first end wall, the length h1 of the connecting portion, the length h2 of the guiding portion, the thickness t1 of the first fixing portion, the thickness t2 of the current collecting member, the height t3 of the first tab, and the height w of the insulating region satisfy the following relationship: h1 + h2 ≤ t1 + t2 + t3 + w. In this embodiment, the connecting portion and the guiding portion can be staggered relative to the active material region of the main body, which helps alleviate compression of the active material region by the second insulating portion and reduces capacity density loss.

[0020] In some embodiments, a receiving groove is formed on a side of the first insulating portion facing the electrode assembly, and the first fixing portion of the terminal post is at least partially received within the receiving groove. Providing a receiving groove for the first fixing portion can make the internal components of the battery more compact, effectively utilize the internal space of the housing, and help increase the battery capacity.

[0021] In some embodiments, the depth of the receiving groove along the thickness direction of the first end wall is less than or equal to the thickness of the first fixing portion. The first fixing portion protrudes from the receiving groove to facilitate connection with the current collecting member. The first fixing portion can provide support for the current collecting member and alleviate deformation of the current collecting member during welding and use.

[0022] In some embodiments, the connection portion does not extend beyond the end of the insulating region near the first end wall, along the direction from the first end wall toward the electrode assembly. This embodiment allows the thicker connection portion of the second insulating portion to avoid the insulating region, alleviating compression of the electrode assembly when the second insulating portion is disposed between the electrode assembly and the sidewall, thereby reducing loss of capacity density.

[0023] In some embodiments, along the thickness direction of the first end wall, the depth h0 of the receiving groove, the length h1 of the connecting portion, the thickness t1 of the first fixing portion, the thickness t2 of the current collecting member, and the height t3 of the first tab satisfy the following relationship: h1 ≤ t1 + t2 + t3 - h0. This embodiment allows the thicker connecting portion of the second insulating portion to avoid the insulating area, alleviating compression of the electrode assembly when the second insulating portion is disposed between the electrode assembly and the sidewall, thereby reducing loss of capacity density.

[0024] In some embodiments, the guide portion extends along the first end wall toward the electrode assembly, and does not extend beyond the end of the insulating region proximal to the electrode assembly. This embodiment allows the guide portion to be staggered with the active material region, thereby alleviating the compression of the active material region by the second insulating portion on the main body of the electrode assembly and reducing capacity density loss.

[0025] In some embodiments, along the thickness direction of the first end wall, the depth h0 of the receiving groove, the length h1 of the connecting portion, the length h2 of the guide portion, the thickness t1 of the first fixing portion, the thickness t2 of the current collecting member, the height t3 of the first tab, and the height w of the insulating region satisfy the following relationship: h1 + h2 ≤ t1 + t2 + t3 + w - h0. This embodiment allows the connection portion and the guide portion to be positioned away from the active material region of the electrode assembly, thereby minimizing compression of the active material region by the insulating member and space occupation within the housing, thereby reducing capacity density loss.

[0026] In some embodiments, the thickness t1 of the first fixing portion along the first direction satisfies 0.4 mm ≤ t1 ≤ 1.2 mm. Reasonable design of the height of the first fixing portion can effectively utilize the volume space in the housing, reduce unnecessary capacity loss, and increase the capacity of the battery.

[0027] In some embodiments, the thickness t2 of the current collecting member along the first direction satisfies 0.2 mm ≤ t2 ≤ 0.6 mm. Selecting an appropriate height dimension can balance the current-carrying capacity of the current collecting member with the loss of battery capacity and weight, thereby improving the overall performance of the battery.

[0028] In some embodiments, the height t3 of the first tab along the first direction satisfies 0.5 mm ≤ t3 ≤ 1.5 mm. Proper selection of the height t3 of the first tab can make the structural arrangement in the battery housing more reasonable, thereby improving the capacity and performance of the battery.

[0029] In some embodiments, the length h1 of the connecting portion of the insulating member along the first direction satisfies 0

[0030] In some embodiments, the length h2 of the guide portion of the insulating member along the first direction satisfies 1 mm ≤ h2 ≤ 8.5 mm. By selecting an appropriate length of the guide portion, a large squeezing force on the active material coating of the electrode sheet is avoided, thereby affecting the performance of the battery.

[0031] In some embodiments, the second insulating portion further includes an extension portion connected to an end of the guide portion remote from the connection portion. The thickness of the extension portion is less than or equal to the minimum thickness of the guide portion, and at least a portion of the extension portion is located between the active material area and the sidewall. Providing a minimum thickness extension portion at the end of the second insulating portion remote from the first insulating portion, at least a portion of which is located between the active material area and the sidewall, can provide more reliable physical insulation and reduce the risk of short circuits within the battery. The extension portion can also limit the position of the electrode assembly within the housing, improving the stability and reliability of the battery's internal structure.

[0032] In some embodiments, the thickness b1 of the connecting portion satisfies 0.2 mm ≤ b1 ≤ 1 mm, and the thickness b3 of the extending portion satisfies 0.02 mm ≤ b3 ≤ 0.1 mm. This allows the thickness of the connecting portion and the thickness of the extending portion to be appropriately selected based on the size requirements of the components within the battery, thereby achieving reliable insulation and minimizing capacity loss.

[0033] In some embodiments, a length h3 of the extension portion along the first direction satisfies 0<h3≤7mm. Selecting an extension portion of a suitable length can achieve reliable insulation between the electrode assembly and the housing.

[0034] In some embodiments, the housing is cylindrical; the outer edge of the first insulating portion is rounded, and the outer diameter of the second insulating portion is less than or equal to the inner diameter of the sidewall of the housing. Setting the outer diameter of the second insulating portion less than or equal to the inner diameter of the sidewall facilitates assembly of the insulating member into the interior of the housing, reducing assembly difficulty.

[0035] In some embodiments, the outer diameter of the second insulating portion gradually increases in a direction away from the first insulating portion. The outwardly flared opening can achieve a tighter fit with the inner surface of the side wall of the housing, reducing capacity loss caused by gaps and facilitating assembly within the battery.

[0036] ​In some embodiments, the second insulating portion includes a connecting portion and a guiding portion, arranged sequentially in a direction away from the first insulating portion. The outer diameter D1 at the junction of the connecting portion and the guiding portion, the outer diameter D2 of the guiding portion at the end distal from the connecting portion, and the inner diameter D of the housing satisfy the following relationship: D1 ≤ D2 ≤ D. This specific relationship between the outer diameters of the connecting portion and the guiding portion facilitates smooth placement of the insulating member into the housing. Furthermore, the flared opening of the second insulating portion better aligns with the inner surface of the housing, thereby preventing interference with the electrode assembly and potentially causing damage.

[0037] In some embodiments, the second insulating portion further includes an extension portion; the extension portion is located at an end of the guide portion remote from the connecting portion; and an outer diameter D3 of the extension portion remote from the guide portion satisfies the following: D1 ≤ D2 ≤ D3 ≤ D. The outer diameters of the connecting portion, the guide portion, and the end of the extension portion remote from the first insulating portion of the second insulating portion increase sequentially, thereby facilitating assembly of the insulating member within the housing and preventing interference with the electrode assembly.

[0038] In some embodiments, the inner diameter D of the sidewall of the housing satisfies the following conditions: 44.8 mm ≤ D ≤ 45.5 mm; the outer diameter D1 at the junction of the connecting portion and the guide portion satisfies the following conditions: 43.5 mm ≤ D1 ≤ 45.5 mm; the outer diameter D2 of the guide portion at the end distal from the connecting portion satisfies the following conditions: 44.5 mm ≤ D2 ≤ 45.5 mm; and the outer diameter D3 of the extension portion at the end distal from the guide portion satisfies the following conditions: 44.7 mm ≤ D3 ≤ 45.5 mm. By appropriately selecting the outer diameters of the various components of the second insulating portion based on the inner diameter of the battery housing, the structural layout within the housing can be optimized and assembly can be simplified.

[0039] In some embodiments, the first insulating portion includes a second through-hole and a groove located on the first side and surrounding the second through-hole. The terminal extends through the second through-hole so that the first fixing portion is accommodated within the groove. Providing a groove for accommodating the first fixing portion effectively utilizes the internal space of the housing, reducing the volume of the housing occupied by non-pole-plate components, and thereby increasing the capacity of the battery.

[0040] In some embodiments, the insulating member further includes at least one boss located on the first side surface of the first insulating portion for abutting the current collecting member. The boss can abut the surface of the current collecting member, thereby providing a supporting force to the current collecting member, thereby alleviating deformation of the current collecting member caused by stress.

[0041] In some embodiments, the at least one boss, the first insulating portion, and the second insulating portion are integrally injection molded. Integral injection molding can simultaneously form an insulating part with a complex surface, reducing the workload of secondary processing of parts and components and lowering manufacturing costs.

[0042] In some embodiments, the insulating member is connected to the inner surface of the housing by bonding, which can simplify the assembly of the insulating member and improve the reliability of insulation.

[0043] In some embodiments, at least one notch is provided at one end of the second insulating portion away from the first insulating portion. The notch can provide deformation space when the insulating member is inserted into the housing and the tab is assembled, thereby relieving stress and reducing assembly difficulty.

[0044] An embodiment of the second aspect of the present application provides a battery, which includes the battery cell in the above embodiment.

[0045] An embodiment of the third aspect of the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0046] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0048] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0049] FIG2 is a schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0050] FIG3 is a front view of a battery cell according to some embodiments of the present application;

[0051] FIG4 is a cross-sectional view of the battery cell in FIG3 along the AA direction;

[0052] FIG5 is a perspective view of an insulating member according to some embodiments of the present application;

[0053] FIG6 is a cross-sectional view of an insulating member along the CC direction according to some embodiments of the present application;

[0054] FIG7 is a cross-sectional view of an insulating member along the CC direction according to some other embodiments of the present application;

[0055] FIG8 is a partial enlarged view of point B in FIG4 ;

[0056] FIG9 is a cross-sectional view along the AA direction in FIG3 of some other embodiments of the present application;

[0057] FIG10 is a partial enlarged view of point D in FIG9 ;

[0058] FIG11 is a cross-sectional view of an insulating member along the CC direction according to some other embodiments of the present application;

[0059] FIG12 is a cross-sectional view of an insulating member along the CC direction according to some other embodiments of the present application;

[0060] FIG13 is a perspective view of insulating members according to other embodiments of the present application;

[0061] FIG14 is a perspective view of insulating members according to some other embodiments of the present application.

[0062] Description of reference numerals:

[0063] Vehicles 1000;

[0064] Battery 100, controller 200, motor 300;

[0065] Box body 10, first part 11, second part 12;

[0066] Battery cell 20, shell 21, side wall 211, first end wall 212, electrode assembly 22, first electrode tab 221, main body 222, active material area 2221, insulating area 2222; current collecting member 23, insulating member 24, first insulating portion 241, first through hole 2411, accommodating groove 2412, boss 2413, second insulating portion 242, connecting portion 2421, guide 2422, extension portion 2423, notch 243, pole 25, first fixing portion 251, pole body 252, second fixing portion 253, end cover 26, first direction X, second direction Y. DETAILED DESCRIPTION

[0067] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0068] 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.

[0069] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0070] References to "embodiments" herein 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.

[0071] 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.

[0072] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0073] 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.

[0074] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," 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; 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.

[0075] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0076] The applicant has noticed that when the electrode assembly of the battery is conductively connected to the electrode lead-out structure, the negative electrode tab of the electrode assembly is conductively connected to the battery shell through the current collecting component, and the positive electrode tab of the electrode assembly is conductively connected to the electrode post through the current collecting component. In order to avoid short circuit, it is necessary to avoid contact between the positive electrode tab of the battery and the battery shell when the positive electrode tab is connected to the electrode post.

[0077] To prevent short circuits, an insulating member can be placed between the conductive connection to the positive electrode and the housing. For example, insulating adhesive can be applied between the electrode assembly and the housing, with any excess adhesive smoothed. However, when using adhesive for insulation, the edges of the adhesive may curl, leading to insulation failure. Furthermore, this method reduces production speed, impacting product efficiency.

[0078] Based on the above considerations, and to address the issue of unreliable insulation between the battery's positive electrode and the outer casing, the applicant, after in-depth research, designed an insulating member for a battery cell. The insulating member includes a first insulating portion and a second insulating portion. The second insulating portion is disposed around the outer edge of the first insulating portion and protrudes to one side. The insulating member is disposed within the battery casing, with the first insulating portion positioned between the first end wall of the casing and the first tab of the electrode assembly, and at least a portion of the second insulating portion positioned between the first tab of the electrode assembly and the side wall of the casing. The first and second insulating portions are disposed between the first tab and the outer casing from different orientations, thereby isolating the electrode leads of different polarities from the battery cell, reducing the risk of short circuits within the battery cell and improving battery reliability.

[0079] The placement of insulating components takes up space within the battery housing, affecting the battery's capacity. It may even interfere with the main electrode area, squeezing the electrode assembly and causing excessive stress on the electrode, leading to undesirable wear (e.g., lithium deposition). The applicant has further optimized the structural form and size of the insulating components, allowing them to adapt well to the internal space of the housing, fully utilizing their insulating properties while minimizing adverse effects on other components, such as the electrode assembly.

[0080] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be constructed to improve the insulation reliability between the electrode leads of different polarities within the battery.

[0081] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0082] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0083] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 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 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0084] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0085] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a storage space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. Alternatively, the first portion 11 and the second portion 12 can each be a hollow structure with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0086] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0087] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0088] Please refer to Figures 3-5. Figure 3 is a schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application. Figure 4 is a cross-sectional view of the battery cell 20 along the AA direction in Figure 3. Figure 5 is a perspective view of the insulating member 24 provided in some embodiments of the present application. A battery cell 20 is the smallest unit that makes up a battery. As shown in Figures 3 and 4, the battery cell 20 includes a housing 21, an electrode assembly 22, an insulating member 24, and a terminal 25. As shown in Figures 3 and 4, the battery cell 20 includes a housing 21, an electrode assembly 22, an insulating member 24, and a terminal 25. The housing 21 includes a connected side wall 211 and a first end wall 212. The terminal 25 is insulated and mounted to the first end wall 212 of the housing 21. The electrode assembly 22 is located within the housing 21 and includes a connected first terminal tab 221. The first terminal tab 221 faces the first end wall 212 and is electrically connected to the terminal 25. The insulating member 24 includes a first insulating portion 241 and a second insulating portion 242. The second insulating portion 242 is disposed around the outer edge of the first insulating portion 241 and protrudes toward the side where the electrode assembly 22 is located. The first insulating portion 241 is located between the first end wall 212 and the first electrode tab 221 , and at least a portion of the second insulating portion 242 is located between the first electrode tab 221 and the sidewall 211 .

[0089] The outer shell 21 is a component used to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, electrolyte, and other components. The outer shell 21 includes a sidewall and a first end wall 212 located at one end of the sidewall 211. The first end wall 212 can be integrally formed with the sidewall 211, and an opening is formed at the end of the sidewall 211 away from the first end wall 212 to allow the electrode assembly 22 to be placed within the outer shell 21. The first end wall 212 can also be manufactured separately from the sidewall 211, and an end cap is formed to cover the opening of the sidewall 211. It is understood that the outer shell 21 may also include a second end wall, which is arranged opposite the first end wall 212 and is located at each end of the sidewall 211. The outer shell 21 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylinder, a hexagonal prism, etc. Specifically, the shape of the outer shell 21 can be determined based on the specific shape and size of the electrode assembly 22. The shell 21 can be made of a variety of 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.

[0090] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained in the housing 21. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive and negative electrode active materials react with the electrolyte, and the tabs connect the electrode terminals to form a current loop. The first tab 221 is formed at one end near the first end wall 212. In one example, the first tab 221 may be a positive tab, and the first tab 221 is conductively connected to the pole 25.

[0091] The pole 25 is an electrode terminal that is electrically connected to the first tab 221. The pole 25 passes through the first through-hole on the end wall 212 to be electrically connected to the first tab 221 in the housing 21. The pole 25 and the end wall 212 are insulated to prevent a short circuit when the housing 21 is electrically connected to the negative tab.

[0092] The insulating part 24 can be made of a variety of materials, such as rubber or plastic. The shape of the insulating part 24 can be set according to the layout space in the shell 21 to include a first insulating part 241 and a second insulating part 242. The first insulating part 241 can be flat and have a first side surface and a second side surface that are relatively arranged. The second side surface is used to abut the inner surface of the first end wall 212, so that the first insulating part 241 can be sleeved in the shell 21 to maintain the insulation between the first end wall 212 of the shell 21 and the first pole ear 221. The second insulating part 242 protrudes from the first side surface toward the side where the electrode assembly 22 is located, so that at least a part of the second insulating part 242 is located between the first pole ear 221 of the electrode assembly 22 and the side wall 211 of the shell 21 to achieve insulation between the two.

[0093] According to an embodiment of the present application, an insulating member 24 matching the shape of the shell is provided in the outer shell 21, wherein the insulating member 24 includes a first insulating portion 241 and a second insulating portion 242, the first insulating portion 241 is located between the first pole ear 221 and the first end wall 212, and at least a portion of the second insulating portion 242 is located between the first pole ear 221 and the side wall 211, thereby enabling the first pole ear 221 to be insulated from the outer shell 21 from different directions, thereby reducing the probability of a short circuit risk inside the battery.

[0094] FIG6 is a cross-sectional view of the insulating member 24 along the CC direction in FIG5 . In some embodiments, as shown in FIG6 , the second insulating portion 242 includes a guide portion 2422 . The guide portion 2422 is located at an end of the second insulating portion 242 away from the first insulating portion 241 . The inner surface of the guide portion 2422 is inclined toward the sidewall 211 in a direction away from the first insulating portion 241 .

[0095] The second insulating portion 242 forms an opening at one end away from the first insulating portion 241, and the guide portion 2422 is the second insulating portion 262 located at the end of the second insulating portion 242 away from the first insulating portion 241, that is, the end close to the opening. In the direction away from the first insulating portion 241, the inner surface of the guide portion 242 is inclined in the direction close to the side wall 211, which means that the opening formed by the second insulating portion gradually increases. At least a portion of the second insulating portion 242 is located between the side wall 211 of the shell 21 and the electrode assembly 22. The assembly type requires that a portion of the first pole ear 221 of the electrode assembly 22 be extended into the opening formed by the second insulating portion 242 to achieve a conductive connection between the first pole ear 221 and the pole 25, so that at least a portion of the guide portion 242 is located between the first pole ear 221 and the side wall 211.

[0096] Along the direction away from the first insulating portion 241, the inner surface of the guide portion 2422 is inclined in the direction close to the side wall 211, which is beneficial for the first pole ear 221 of the electrode assembly 22 to be able to more easily enter the accommodating cavity formed by the second insulating portion 242 during assembly. At the same time, the inclined inner surface of the guide portion 2422 can also provide a force for the end of the first pole ear 221 close to the first end wall 212 to converge toward the center of the battery, which is beneficial to the conductive connection between the first pole ear 221 and the pole 25.

[0097] In some embodiments, the thickness of the guide portion 2422 gradually decreases in a direction away from the first insulating portion 241 .

[0098] The guide portion 2422 generally extends in a direction away from the first insulating portion 241. The thickness of the guide portion 2422 refers to the dimension perpendicular to the direction of its extension. In one embodiment, the second insulating portion 242 may extend in a direction perpendicular to the plane in which the first insulating portion 241 is located. The thickness of the guide portion 2422 refers to the thickness in a direction parallel to the plane in which the first insulating portion 241 is located.

[0099] The insulating member 24 is disposed inside the housing 21, which occupies space inside the housing and thus affects the capacity density of the battery. The thickness of the guide portion 2422 is set to gradually decrease, which can improve the utilization rate of the space inside the housing 21.

[0100] FIG7 is a cross-sectional view of the insulating member 24 in FIG5 along the CC direction in some other embodiments. As shown in FIG7 , in some embodiments, the second insulating portion 242 includes a connecting portion 2421 , the ends of which are respectively connected to the first insulating portion 241 and the guide portion 2422 , and the thickness of the connecting portion 2421 is greater than or equal to the maximum thickness of the guide portion 2422 .

[0101] The connecting portion 2421 is connected to the first insulating portion 241 via a chamfered or rounded transition. Since the connecting portion 2421 is closer to the first end wall 212, and the end of the first tab 221 near the first end wall 212 is somewhat converged toward the center to facilitate conductive connection with the terminal 25, the area where the connecting portion 2421 is located is less sensitive to the thickness of the second insulating portion than the area where the guide portion 2422 is located. The thickness of the connecting portion 2421 can be uniform or variable; specifically, the minimum thickness of the connecting portion 2421 can be greater than or equal to the maximum thickness of the guide portion 2422.

[0102] The thickness of the connecting portion 2421 is greater than or equal to the maximum thickness of the guiding portion 2422. On the one hand, it is beneficial to the manufacture and processing of the insulating part 24, and reduces the difficulty of manufacture and processing caused by the thin thickness. On the other hand, the second insulating portion 242 is closer to the electrode assembly 22, and the thickness of the guiding portion 2422 is relatively thin, which can reduce the space occupied in the outer shell 21 and alleviate the extrusion deformation of the electrode assembly 22 by the second insulating portion 242.

[0103] In some embodiments, the difference between the thickness of the connecting portion 2421 and the thickness of the first insulating portion 241 is less than or equal to 0.2 mm.

[0104] The thickness of the first insulating part 241 refers to the thickness of the first insulating part 241 along the direction perpendicular to the first end wall 212. The thickness of the connecting part 2421 refers to the thickness along the extension direction perpendicular to the connecting part 2421. The thickness of the connecting part 2421 can be a fixed thickness value or a variable thickness value. The first insulating part 241 and the second insulating part 242 can be prepared by integral injection molding, or they can be manufactured separately and then connected to each other. It can be understood that the second insulating part 242 is a structure arranged along the edge of the first insulating part 241. Its thickness is too thin or the difference in thickness with the first insulating part 241 is too large, which causes great difficulties in manufacturing and processing, especially for the connecting part 2421 at the connection position. The large thickness difference makes it difficult to ensure that the structural strength of the junction meets the use requirements.

[0105] Limiting the difference between the thickness of the connecting portion 2421 and the thickness of the first insulating portion 241 to less than or equal to 0.2 mm can ensure that the thickness difference between the first insulating portion 241 and the second insulating portion 242, especially the thickness difference at the connecting position, is not too large, thereby facilitating the manufacturing and processing of the insulating member 24 and alleviating the adverse effects of thickness mutation on strength.

[0106] In some embodiments, the thickness of the connection portion 2421 is smaller than the thickness of the first insulating portion 241 .

[0107] The gap between the electrode assembly 22 and the sidewall 211 of the outer casing 21 significantly affects the battery's capacity. By making the thickness of the connecting portion 2421 of the second insulating portion 242 smaller than the thickness of the first insulating portion 241, the space occupied by the second insulating portion 242 within the outer casing can be minimized, thereby reducing battery capacity loss.

[0108] In some embodiments, the thickness of the connecting portion 2421 is equal to the thickness of the first insulating portion 241 .

[0109] The thickness of the connecting portion 2421 is equal to that of the first insulating portion 241 , which is beneficial for integral molding when preparing the insulating member 24 and reduces manufacturing time. The consistent thickness is also beneficial for ensuring the structural strength of the joint.

[0110] FIG8 is a partial enlarged view of point B in FIG4 . In some embodiments, as shown in FIG8 , the pole 25 includes a pole body 252, and a first fixing portion 251 and a second fixing portion 253 respectively located at both ends of the pole body 252. The first fixing portion 251 is located on the side of the first end wall 212 facing the electrode assembly 22, and the second fixing portion 253 is located on the side of the first end wall 212 facing away from the electrode assembly 22. The first end wall 212 is provided with a mounting through hole, and the pole body 252 is at least partially accommodated in the mounting through hole. The first fixing portion 251 and the second fixing portion 252 are used to clamp a portion of the first end wall 212.

[0111] The battery cell further includes a current collecting member 23, at least part of which is located between the first electrode tab 221 and the first fixing portion 251 and is electrically connected to the first electrode tab 221 and the first fixing portion 251. A portion of the first insulating portion 241 is located between the first fixing portion 251 and the first end wall 212.

[0112] The first fixing portion 251 and the second fixing portion 252 are respectively located at both ends of the pole body 252 and protrude relative to the pole body 252 so as to form a groove for clamping the first end wall 212. As shown in Figure 8, in one example, the first fixing portion 251, the second fixing portion 252 and the pole body 252 can form a "U"-shaped groove. A mounting through hole is provided on the first end wall 212, and the first insulating portion 241 is provided with a first through hole 2411 corresponding to the mounting through hole. The shape of the first through hole 2411 and the mounting through hole is adapted to the shape of the pole 25 to allow the pole 25 to pass through the mounting through hole. The side wall of the first end wall 212 forming the mounting through hole is accommodated in the groove of the pole 25. A portion of the first insulating portion 241 close to the mounting through hole is located between the first fixing portion 251 and the first end wall 212, so that the first fixing portion 251 maintains insulation isolation when clamping the first end wall 212.

[0113] In one example, an insulating member may be provided between the electrode body 252 and the side wall of the mounting through-hole of the first end wall 212, and between the second fixing portion 253 and the side of the first end wall 212 facing away from the electrode assembly 22, to maintain an insulated connection and prevent a short circuit. For example, the insulating member may be L-shaped in cross-section and disposed between the electrode 25 and the first end wall 212. Together with the insulating member 24, the insulating member provides an insulated connection between the conductive path formed by the electrode 25 that is electrically connected to the first tab and the housing 21.

[0114] The current collecting member 23 is a current collecting component made of a conductive material, such as copper. The current collecting member 23 collects the current generated in the electrode assembly 22 and connects it to the electrode terminals (e.g., the electrode posts 25) to form a current loop. The current collecting member 23 is electrically connected to the first electrode tab 221 of the electrode assembly 22 and the electrode posts 25, respectively. In one example, the current collecting member 23 is sandwiched between the first electrode tab 221 and the first fixing portion 251 of the electrode posts 25, and the conductive connection is achieved by welding. The current collecting member 23, the first electrode tab 221, and the first fixing portion 251 can be fixedly connected by welding, such as laser welding, ultrasonic welding, or resistance welding. Along a first direction X parallel to the axial direction of the electrode assembly 22, the first end wall 212, the first insulating portion 241, the first fixing portion 251, the current collecting member 23, and the first electrode tab 221 are arranged in this order.

[0115] In this embodiment, the pole 25 clamps the first end wall 212 by setting a first fixing portion 251 and a second fixing portion 252, and a portion of the first insulating portion 241 is clamped between the first fixing portion 251 and the first end wall 212, which can provide a clamping force perpendicular to the direction of the first end wall 212 to the first insulating portion 241, thereby preventing the insulating member 24 from being offset or misaligned, thereby achieving more reliable insulation, and at the same time reducing the gap between the components along the first direction X, making the internal structure of the battery more compact, thereby reducing the occupation of the internal space of the battery shell and reducing the capacity density loss.

[0116] In some embodiments, as shown in FIG8 , the electrode assembly 22 further includes a main body 222 , the first electrode tab 221 is connected to the main body 222 , the main body 222 includes an active material region 2221 and an insulating region 2222 , and the insulating region 2222 is located between the active material region 2221 and the first electrode tab 221 .

[0117] The active material region 2221 is the area formed by coating the active material on the current collector of the electrode sheet of the electrode assembly 22. The insulating region 2222 is the area formed by coating the current collector of the electrode sheet of the electrode assembly 22 with an insulating coating. The insulating coating can be a ceramic coating, such as an alumina ceramic coating. In one example, using a lithium-ion battery as an example, the active material region 2221 and the insulating region 2222 are located in the coating region of the positive electrode sheet of the electrode assembly 22. The first tab 221 is located at one end of the coating region of the positive electrode sheet near the first end wall 212. In order to reduce the occurrence of adverse losses (such as lithium plating), when the battery plates are wound, the area of ​​the negative electrode plate coated with active material will completely cover the active material area of ​​the positive electrode plate, so as to receive as much lithium ions as possible that are deintercalated from the positive electrode and embedded in the negative electrode. The insulating area 2222 is located between the active material area 2221 of the positive electrode and the first tab 221. The insulating coating of the insulating area 2222 can reduce burrs on the surface, and the insulating area 2222 is arranged corresponding to the extra active material area of ​​the negative electrode plate.

[0118] Providing an insulating region 2222 between the active material region 2221 and the first tab 221 reduces the risk of burr short circuits and the probability of short circuits caused by the overlap of the positive and negative electrodes. The insulating coating in the insulating region 2222, applied to the current collector surface, reduces direct contact between the foil and the electrolyte in the battery, thereby improving battery performance.

[0119] In some embodiments, along the direction of the first end wall 212 pointing to the electrode assembly 22 , ie, the first direction X, the connecting portion 2421 does not extend beyond an end of the insulating region 2222 close to the first end wall 212 .

[0120] The insulating region 2222 includes a first end near the first end wall 212 and a second end near the active material region 2221. The first end is connected to the first electrode tab 221. Because the first electrode tab 221 can bend or fold toward the center of the electrode assembly 22 and connected to the current collecting member 23, the area corresponding to the first end of the insulating region 2222 near the first end wall 212 within the battery cell has a greater tolerance for the thickness of the second insulating portion 242 than the area corresponding to the first end of the insulating region 2222 near the active material region 2221. Along the first direction X, the connecting portion 2421 does not extend beyond the end of the insulating region 2222 near the first end wall 212, meaning that the length of the connecting portion 2421 along the first direction X does not exceed the distance from the first end of the insulating region 2222 to the first insulating portion 241. This also means that along the first direction X, the critical position between the connecting portion 2421 and the guide portion 2422 is located on the side of the first end of the insulating region 2222 near the first end wall 212.

[0121] In this embodiment, the connection portion 2421 is positioned so as not to extend beyond the end of the insulating region 2222 near the first end wall 212 along the first direction X. This allows the thicker connection portion 2421 of the second insulating portion 242 to avoid the insulating region 2222. This alleviates the compression of the electrode assembly when the second insulating portion 242 is positioned between the electrode assembly 22 and the sidewall 211, which in turn reduces the loss of capacity density. Furthermore, the connection portion 2421 avoids the insulating region 2222, allowing the guide portion 2422 to be positioned corresponding to the first electrode tab 221. The inclined inner surface of the guide portion 2422 can be used to bring the first electrode tab 221 toward the center, facilitating the connection between the first electrode tab 221 and the current collecting member 23.

[0122] In some embodiments, as shown in Figures 7-8, along the first direction X, that is, along the thickness direction of the first end wall 212, the length h1 of the connecting portion 2421, the thickness t1 of the first fixing portion 251, the thickness t2 of the current collecting member 23, and the height t3 of the first electrode tab 221 satisfy: h1≤t1+t2+t3.

[0123] The first fixing portion 251 has a surface facing away from the first tab 221 that abuts the first side surface of the first insulating portion 241. The current collecting member 23 can be flat. The specific shape can be determined based on the shape of the battery cell and the connection position of the first tab. For example, it can be a circular current collecting plate. The height t3 of the first tab 221 refers to its dimension along the first direction X. If the first tab 221 is bent, the height t3 of the first tab 221 along the first direction X refers to the height dimension after the bend.

[0124] The length of the connecting portion 2421 is set to be less than the sum of the heights of the first fixing portion 251, the current collecting component 23 and the first pole ear 221. At this time, the connecting portion 2421 is arranged corresponding to the first fixing portion 251, the current collecting component 23 and the first pole ear 221, and these components have relatively small space requirements for the area close to the side wall 211. The connecting portion 2421 can be allowed to have a certain thickness to meet the structural and manufacturing requirements of the insulating part 24 itself, avoiding the design thickness being too thin to be difficult to manufacture and form. At the same time, the connecting portion 2421 can be staggered with the main body 222 of the electrode assembly 22, thereby avoiding the thicker connecting portion 2421 from occupying the layout space of the main body 222 in the shell 21, reducing the capacity loss in the battery.

[0125] In some embodiments, as shown in FIG. 8 , along the direction of the first end wall 212 pointing toward the electrode assembly 22 , ie, along the first direction X, the guide portion 2422 does not extend beyond one end of the insulating region 2222 close to the active material region 2221 .

[0126] The guide portion 2422 does not extend beyond the end of the insulating region 2222 close to the active material region 2221, which means that the distance between the end of the guide portion 2422 away from the first insulating portion 241 and the first end wall 212 along the first direction X is less than the distance between the end of the insulating region 2222 close to the active material region 2221 and the first end wall 212.

[0127] In this embodiment, the guide portion 2422 does not exceed one end of the insulating region 2222 close to the active material region 2221 along the first direction X, so that the guide portion 2422 and the active material region 2221 are staggered, thereby alleviating the squeezing of the active material region of the main body 222 of the electrode assembly 22 by the second insulating portion 242, while reducing the capacity density loss.

[0128] In some embodiments, as shown in FIG8 , along the thickness direction of the first end wall 212 , that is, along the first direction X, the length h1 of the connecting portion 2421 , the length h2 of the guiding portion 2422 , the thickness t1 of the first fixing portion 251 , the thickness t2 of the current collecting member 23 , the height t3 of the first electrode tab 221 , and the height w of the insulating region 2222 satisfy: h1+h2≤t1+t2+t3+w.

[0129] The insulating area 2222 and the active material area 2221 are arranged in sequence along the first direction X. The insulating area 2222 is located on the side of the pole piece close to the first end wall 212. Since the thickness of the insulating coating can be smaller than the thickness of the active material coating, the gap between the diaphragms at the position of the insulating area 2222 is larger relative to the gap between the diaphragms in the active material area 2221, which can accommodate an insulating member 24 of a certain thickness without causing excessive pressure on the pole piece or excessive capacity loss.

[0130] The sum of the lengths of the connecting portion 2421 and the guiding portion 2422 is less than the sum of the heights of the first fixing portion 251, the current collecting component 23, the first pole ear 221 and the insulating area 2222. In this way, the connecting portion 2421 and the guiding portion 2422 can be staggered with the active material area 2221 of the main body 222, which can alleviate problems such as adverse losses (such as lithium deposition) during the cycle caused by the second insulating portion 242 squeezing the active material area 2221.

[0131] Figure 9 is a cross-sectional view taken along the AA direction in Figure 3 of some further embodiments of the present application; Figure 10 is a partial enlarged view of point D in Figure 9; Figure 11 is a cross-sectional view of the insulating member 24 taken along the CC direction in some further embodiments of the present application; and Figure 12 is a cross-sectional view of the insulating member 24 taken along the CC direction in some further embodiments of the present application.

[0132] In some embodiments, as shown in FIG. 9-FIG . 11 , a receiving groove 2412 is formed on a side of the first insulating portion 241 facing the electrode assembly 22 , and the first fixing portion 251 of the electrode post 25 is at least partially received in the receiving groove 2412 .

[0133] The accommodating groove 2412 is located on the first side of the first insulating part 241 facing the electrode assembly 22. The accommodating groove 2412 includes a bottom surface and a side surface arranged along the edge of the bottom surface. The bottom surface is recessed toward the side where the first end wall 212 is located relative to the first side surface, so that the thickness of the first insulating part 241 inside the accommodating groove 2412 is less than the thickness outside the accommodating groove 2412. The first fixing part 251 can be at least partially accommodated in the accommodating groove 2412 and abut against the bottom surface of the accommodating groove 2412 after assembly.

[0134] In one example, the first insulating portion 241 and the first end wall 212 are provided with mounting holes to allow the pole 25 to pass therethrough, thereby leading the electrode out of the housing 21. The receiving groove 2412 is provided around the mounting hole, so that the mounting hole is located inside the receiving groove 2412, for example, the mounting hole is located at the center of the receiving groove 2412.

[0135] By providing the receiving groove 2412 for receiving the first fixing portion 251 , the space inside the battery shell occupied by the first fixing portion 251 along the first direction X can be reduced, so that the components inside the battery are arranged more compactly, the internal space of the shell 21 is effectively utilized, and the capacity of the battery is increased.

[0136] In some embodiments, as shown in FIG. 10 , along the thickness direction of the first end wall 212 , i.e., along the first direction X, the depth h0 of the accommodating groove 2412 along the first direction X is less than or equal to the thickness t1 of the first fixing portion 251 along the first direction X, i.e., h0≤t1.

[0137] The depth h0 of the receiving groove 2412 along the first direction X refers to the height difference in the first direction X between the bottom surface of the receiving groove 2412 and the first side surface of the first insulating portion 241 .

[0138] One side surface of the first fixing portion 251 abuts the bottom surface of the receiving groove 2412, while the other side surface of the first fixing portion 251 is electrically connected to the current collecting member 23. Due to the relatively large size of the current collecting member 23, it is not practical to accommodate the current collecting member 23 within the receiving groove 2412. When the depth h0 of the receiving groove 2412 is greater than the thickness t1 of the first fixing portion 251, a gap will appear between the first fixing portion 251 and the current collecting member 23, preventing close contact. This may cause difficulties in connecting the two, such as potentially causing cold or leaky solder joints, and thus compromise the reliability of the connection. The first fixing portion 251 protruding from the receiving groove 2412 facilitates connection with the current collecting member 23, providing support for the current collecting member 23 and mitigating deformation of the current collecting member 23 during welding and use.

[0139] In some embodiments, along the direction of the first end wall 212 pointing to the electrode assembly 22 , ie, the first direction X, the connecting portion 2421 does not extend beyond an end of the insulating region 2222 close to the first end wall 212 .

[0140] When the receiving groove 2412 is provided on the first side surface of the first insulating portion 241, the connecting portion may also be provided so as not to extend beyond the end of the insulating region 2222 close to the first end wall 212 along the first direction X, thereby being staggered with the insulating region 2222. The beneficial effects of this embodiment have been described in the previous embodiments and will not be repeated here.

[0141] In some embodiments, as shown in Figures 10 and 11, along the thickness direction of the first end wall 212, that is, along the first direction X, the depth h0 of the accommodating groove 2412, the length h1 of the connecting portion 2421, the thickness t1 of the first fixing portion 251, the thickness t2 of the current collecting member 23, and the height t3 of the first electrode tab 221 satisfy: h1≤t1+t2+t3-h0.

[0142] When an accommodating groove 2412 is provided on the first side surface of the first insulating part 241, the depth h0 of the accommodating groove 2412, the length h1 of the connecting part 2421, the thickness t1 of the first fixing part 251, the thickness t2 of the current collecting component 23 and the height t3 of the first pole ear 221 are set to meet the above conditions so that the connecting part 2421 can avoid the main body 222 of the electrode assembly 22, thereby avoiding the large thickness of the connecting part 2421 from squeezing the main body 222 and occupying the layout space inside the battery shell.

[0143] In some embodiments, as shown in FIG. 10 , along the direction of the first end wall 212 pointing toward the electrode assembly 22 , ie, along the first direction X, the guide portion 2422 does not extend beyond one end of the insulating region 2222 close to the active material region 2221 .

[0144] In this embodiment, the guide portion 2422 does not exceed the end of the insulating area 2222 close to the active material area 2221 along the first direction X, so that the guide portion 2422 and the active material area 2221 are staggered, thereby alleviating the squeezing of the active material area of ​​the main body 222 of the electrode assembly 22 by the second insulating portion 242, while reducing the loss of battery capacity density.

[0145] In some embodiments, as shown in Figures 10 and 11, along the thickness direction of the first end wall 212, that is, along the first direction X, the depth h0 of the accommodating groove 2412, the length h1 of the connecting portion 2421, the length h2 of the guiding portion 2422, the thickness t1 of the first fixing portion 251, the thickness t2 of the current collecting member 23, the height t3 of the first electrode tab 221 and the height w of the insulating region 222 satisfy: h1+h2≤t1+t2+t3+w-h0.

[0146] By setting the sum of the heights of the connecting portion 2421 and the guiding portion 2422 to be less than or equal to the height of the first fixing portion 251, the current collecting component 23, the first electrode tab 221 and the insulating area 2222 and the size of the accommodating groove 2412, the positions of the connecting portion 2421 and the guiding portion 2422 can be avoided from the position of the active material area 2221 of the electrode assembly 22, thereby minimizing the squeezing of the active material area by the insulating part and the space occupied, thereby reducing the capacity density loss.

[0147] In some embodiments, as shown in FIG. 8 , along the first direction X, a thickness t1 of the first fixing portion 251 satisfies 0.4 mm ≤ t1 ≤ 1.2 mm.

[0148] In some embodiments, along the first direction X, a thickness t2 of the current collecting member 23 satisfies 0.2 mm≦t2≦0.6 mm.

[0149] In some embodiments, along the first direction X, a height t3 of the first tab 221 satisfies 0.5 mm≤t3≤1.5 mm.

[0150] In some embodiments, along the first direction X, the length h1 of the connecting portion 2421 satisfies 0

[0151] In some embodiments, along the first direction X, a length h2 of the guide portion 2422 satisfies 1 mm ≤ h2 ≤ 8.5 mm.

[0152] ​The thickness t1 of the first fixing portion 251, the thickness t2 of the current collecting member 23, and the height t3 of the first electrode tab 221 all refer to dimensions along the first direction X. For example, the first electrode tab 221 may be bent or squeezed. In this case, the height t3 of the first electrode tab 221 refers to the dimension in the bent and squeezed state along the first direction X. The extension direction of the second insulating portion 242 is not limited to a direction perpendicular to the plane of the first insulating portion 241. Therefore, the length h1 of the connecting portion 2421 and the length h2 of the guiding portion 2422 are also lengths along the first direction X, rather than the lengths of the second insulating portion 2422.

[0153] In the battery case, the larger the size of other components, the smaller the space available to accommodate the electrode assembly, which means that the battery capacity is reduced. Reasonable design of the height of the first fixing portion 251, the thickness of the current collecting component 23, and the height of the first pole ear 221 can effectively utilize the volume space in the shell 21, reduce unnecessary capacity loss, and increase the capacity of the battery. Correspondingly, in order to take into account the reliability of the insulation connection and the capacity density of the battery, selecting a suitable length range of the connecting portion 2421 and the guide portion 2422 of the second insulating portion 242 can enable the second insulating portion 242 to be more reasonably arranged between the electrode assembly 22 and the side wall 211, while meeting the insulation effect and alleviating the squeezing of the pole piece and the loss of capacity.

[0154] In some embodiments, as shown in FIG10 and FIG11 , the second insulating portion 242 further includes an extension portion 2423 ; the extension portion 2423 is connected to the end of the guide portion 2422 away from the connection portion 2421 , and the thickness of the extension portion 2423 is less than or equal to the minimum thickness of the guide portion 2422 . The extension portion 2423 is at least partially located between the active material region 2221 and the sidewall 211

[0155] The extension portion 2423 is located at one end away from the first insulating portion 241. The extension portion 2423 may form an opening to allow the electrode assembly to enter and electrically connect with the electrode post during assembly. Because the thickness of the guide portion 2422 is uneven, the thickness of the extension portion 2423 is less than or equal to the minimum thickness of the guide portion 2422, which helps to reduce the space occupied by the housing. At least a portion of the extension portion 2423 may be disposed between the active material area 2221 of the main body 222 and the sidewall 211 of the housing 21 to insulate the two.

[0156] In order to avoid occupying the layout space of the electrode assembly, an insulating member is often not provided between the active material area 2221 of the electrode assembly and the side wall 211 of the shell 21. Instead, the active material area 2221 of the electrode assembly is spaced apart from the side wall 211 by means of a diaphragm and end limiters. However, such an arrangement cannot completely and reliably achieve insulation between the two, especially when the diaphragm is punctured or the battery shell is deformed, there is still a large risk of short circuit. In this embodiment, an extension portion 2423 with the smallest thickness at one end is provided at the end of the second insulating portion 242 away from the first insulating portion 241, and at least a portion of it is arranged between the active material area 2221 and the side wall 211, thereby forming a more reliable physical insulation and reducing the risk of short circuit inside the battery. At the same time, the thickness of the extension portion 2423 can be designed to be as small as possible to reduce the compression of the electrode sheet and the resulting capacity loss. In addition, the arrangement of the extension portion 2423 around the active material area 2221 can also limit the position of the electrode assembly in the shell, improving the stability and reliability of the internal structure of the battery.

[0157] In some embodiments, as shown in FIG. 11 , the thickness b1 of the connecting portion 2421 satisfies 0.2 mm ≤ b1 ≤ 1 mm, and the thickness b3 of the extending portion 2423 satisfies 0.02 mm ≤ b3 ≤ 0.1 mm.

[0158] The thickness b1 of the connecting portion 2421 and the thickness b3 of the extending portion 2423 refer to the thickness along the direction perpendicular to their respective extension directions. In one example, the extending portion 2421 and the connecting portion 2423 both extend along the first direction X, and the corresponding thickness is the thickness dimension along the second direction Y perpendicular to the first direction X. Along the extension direction of the second insulating portion 241, the thickness of the connecting portion 2421, the guide portion 2422, and the extending portion 2423 gradually decreases, that is, the closer to the active material area 2222 of the electrode assembly 22, the smaller the thickness of the second insulating portion 2422. In one example, the thickness of the connecting portion 2421 and the extending portion 2423 remains unchanged, the thickness b1 of the connecting portion 2421 is equal to the first thickness, the thickness b3 of the extending portion 2423 is equal to the second thickness, and the thickness b2 of the guiding portion 2422 gradually decreases from the first thickness to the second thickness. In another example, the thickness of the connecting portion 2421 and / or the extension portion 2423 may also be variable, for example, may be linearly variable, in which case the maximum value of the thickness b2 of the guide portion 2422 is less than or equal to the minimum thickness of the connecting portion 2421, and the minimum value of the thickness b2 of the guide portion 2422 is greater than or equal to the maximum thickness of the extension portion 2423.

[0159] By optimizing the thickness distribution of the second insulating part 242, the thickness of the second insulating part 242 at different positions can meet the layout requirements of different areas in the outer shell 21, thereby improving the insulation reliability while avoiding squeezing the electrode plates in the outer shell 21 and minimizing the capacity loss of the battery.

[0160] In some embodiments, as shown in FIG. 11 , a length h3 of the extension portion 2423 along the first direction X satisfies 0<h3≤7 mm.

[0161] The length h3 of the extension portion 2423 along the first direction X is directly related to the size of the contact area between the second insulating portion 241 and the active material area 2221. A suitable contact area can provide a reliable insulation connection between the electrode assembly 22 and the side wall 211, and provide limiting support for the electrode assembly 22 along the second direction Y, which can alleviate the shaking of the electrode assembly 22 in the shell.

[0162] In some embodiments, the housing 21 is cylindrical; the outer edge of the first insulating portion 241 is circular, and the outer diameter of the second insulating portion 242 is less than or equal to the inner diameter of the sidewall 211 of the housing 21 .

[0163] The second insulating portion 242 includes an inner side surface and an outer side surface that are oppositely disposed. The outer diameter of the second insulating portion 242 refers to the diameter of the cross-sectional circle of the outer side surface of the second insulating portion 242 along a plane perpendicular to the first direction X. The outer side surface of the second insulating portion 242 is directly aligned with the inner surface of the sidewall 211 of the housing 21. In some examples, the outer side surface of the second insulating portion 242 is a flat surface, and the inner side surface of the second insulating portion 242 can be stepped, so that the thickness of the second insulating portion 242 along the first direction X gradually changes.

[0164] Setting the outer diameter of the second insulating portion 242 to be smaller than or equal to the inner diameter of the side wall 211 facilitates assembly of the insulating member 24 into the interior of the housing 21 , thereby reducing assembly difficulty.

[0165] In some embodiments, along the direction from the first end wall 212 to the electrode assembly 22 , the outer diameter of the second insulating portion 242 gradually increases in a direction away from the first insulating portion 241 .

[0166] The outer diameter of the second insulating portion 242 refers to the dimension away from the outer surface of the electrode assembly 22. The first insulating portion 241 is circular, and the second insulating portion 242 is cylindrical or conical around the edge of the first insulating portion 241. The outer diameter of the second insulating portion 242 gradually increases in the direction away from the first insulating portion 241, so that the open end of the second insulating portion 242 is in an outwardly flared state.

[0167] In this embodiment, the outwardly expanded mouth of the second insulating portion 242 enables the second insulating portion 242 to fit more closely with the inner surface of the side wall 211 of the outer shell 21, thereby reducing capacity loss caused by the gap and facilitating internal assembly of the battery.

[0168] Figure 12 is a cross-sectional view of the insulating member 24 along the CC direction according to some other embodiments of the present application. In some embodiments, as shown in Figure 12, the second insulating portion 242 includes a connecting portion 2421 and a guiding portion 2422, which are sequentially arranged in a direction away from the first insulating portion 241. The outer diameter D1 at the intersection of the connecting portion 2421 and the guiding portion 2422, the outer diameter D2 of the guide portion 2422 at the end away from the connecting portion 2421, and the inner diameter D of the sidewall 211 of the housing 21 satisfy the following conditions: D1 ≤ D2 ≤ D.

[0169] The outer diameter D2 of the guide portion 2422 at the end away from the connecting portion 2421 refers to the diameter of the outer surface of the opening of the guide portion 2422. The outer diameter D1 at the intersection of the connecting portion 2421 and the guide portion 2422 is actually also the outer diameter of the end of the connecting portion 2421 away from the first insulating portion 241. The inner diameter D of the sidewall 211 refers to the diameter of the inner surface of the sidewall 211 along a cross section perpendicular to the first direction X.

[0170] When D1≤D2≤D is satisfied, the outer diameter of the second insulating portion 242 increases as a whole in a direction away from the first insulating portion 241. Specifically, the outer diameter may increase in a stepwise manner or may increase linearly and uniformly.

[0171] By specifically setting the size relationship between the outer diameters of the connecting portion 2421 and the guiding portion 2422, the insulating member 24 can be smoothly inserted into the outer shell 21. At the same time, the outwardly expanded mouth of the second insulating portion 242 is more suitable for fitting with the inner surface of the outer shell 21, which helps to reduce unnecessary capacity loss.

[0172] In some embodiments, as shown in FIG12 , the second insulating portion 242 further includes an extension portion 2423 ; the extension portion 2423 is located at one end of the guide portion 2422 away from the connecting portion 2421 ; an outer diameter D3 of the extension portion 2423 away from the guide portion 2422 satisfies: D1≤D2≤D3≤D.

[0173] The guiding portion 2422 is located between the connecting portion 2421 and the extending portion 2423 . The outer diameter D2 of the guiding portion 2422 at one end away from the connecting portion 2421 is actually the outer diameter of the junction of the guiding portion 2422 and the extending portion 2423 .

[0174] The outer diameters of the connecting portion 2421 , the guiding portion 2422 and the extending portion 2423 of the second insulating portion 242 away from the first insulating portion 241 increase sequentially, which facilitates the assembly of the insulating member 24 into the interior of the housing 21 and reduces the difficulty of assembly.

[0175] In some embodiments, the inner diameter D of the side wall 211 of the shell satisfies: 44.8mm≤D≤45.5mm; the outer diameter D1 at the intersection of the connecting portion 2421 and the guide portion 2422 satisfies: 43.5mm≤D1≤45.5mm; the outer diameter D2 of the end of the guide portion 2422 away from the connecting portion 2421 satisfies: 44.5mm≤D2≤45.5mm; the outer diameter D3 of the end of the extension portion 2423 away from the guide portion 2422 satisfies: 44.7mm≤D3≤45.5mm.

[0176] Reasonable selection of the outer diameter of each part of the second insulating portion according to the inner diameter of the battery housing can optimize the structural arrangement within the housing 21 and simplify the assembly process.

[0177] FIG13 is a perspective view of the insulating member 24 in some other embodiments of the present application. In some embodiments, as shown in FIG13 , the insulating member 24 further includes at least one boss 2413 located on the first side of the first insulating portion 241 for abutting against the current collecting member 23 .

[0178] The boss 2413 is located on the first side surface of the first insulating portion 241 and protrudes outward from the surface of the first side surface. The number of the boss 2413 can be one or more, wherein the multiple bosses can be evenly spaced around the center of the first insulating portion 241.

[0179] When the insulating member 24 is assembled into the housing 21 , the boss 2413 can abut against the upper surface of the current collecting member 23 , thereby providing a supporting force to the current collecting member 23 , thereby alleviating deformation of the current collecting member 23 .

[0180] In some embodiments, the at least one boss 2413 , the first insulating portion 241 , and the second insulating portion 242 are integrally injection molded.

[0181] One-piece injection molding can simultaneously form the insulating part 24 with a complex surface, reducing the workload of secondary processing of parts and components and lowering manufacturing costs.

[0182] In some embodiments, the insulating member 24 is connected to the inner surface of the housing 21 by bonding.

[0183] The insulating member 24 can make the first insulating part 241 bonded to the inner side surface of the first end wall 212 by adhesive, and can also make the second insulating part 242 bonded to the inner side surface of the side wall 211 by adhesive, and can also make the first insulating part 241 and the second insulating part 242 bonded to the first end wall 212 and the side wall 211 respectively at the same time.

[0184] The bonding method can simplify the assembly of the insulating member 24 and prevent the insulating member 24 from moving or rotating relative to the housing 21, thereby preventing the connection of other components in the housing from being affected, thereby improving the reliability of insulation.

[0185] FIG14 is a perspective view of the insulating member 24 according to some other embodiments of the present application. In some embodiments, as shown in FIG14 , at least one notch 243 is defined at one end of the second insulating portion 242 away from the first insulating portion 241 .

[0186] The notch 243 is located at the end of the second insulating portion 242 where the opening is formed. For example, the notch 243 is located at the end of the extension portion 2423 away from the first insulating portion 241. There can be one or more notches 243, with the multiple notches 243 being spaced apart along the circumference of the second insulating portion 242. In one example, there are three notches 243. The shape of the notches 243 can be rectangular, trapezoidal, or arcuate. In one example, the length dimension of the notch 243 along the first direction X is greater than the length dimension along the second direction Y.

[0187] By providing a notch 243 at one end of the second insulating portion 242 away from the first insulating portion 241 , deformation space can be provided when the insulating member 24 is inserted into the shell and the tab is assembled, thereby releasing stress and reducing assembly difficulty.

[0188] An embodiment of the second aspect of the present application provides a battery, comprising the battery cell in the above embodiment.

[0189] An embodiment of the third aspect of the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0190] The battery cells 20 in some embodiments are further described below with reference to FIG. 3 to FIG. 14 .

[0191] The battery cell 20 includes a housing 21, an electrode assembly 22, a current collecting member 23, an insulator 24, and a terminal 25. The housing 21 includes a connected sidewall 211 and a first end wall 212. The terminal 25 is insulated and mounted to the first end wall 212 of the housing 21. The electrode assembly 22 is located within the housing 21 and includes a connected first tab 221 and a main body 222. The current collecting member 23 is electrically connected to the first tab 221 and the terminal 25, respectively. The insulator 24 includes a first insulating portion 241 and a second insulating portion 242. The second insulating portion 242 surrounds the outer edge of the first insulating portion 241 and protrudes outward from the first side surface of the first insulating portion 241. The first insulating portion 241 is located between the first end wall 212 and the current collecting member 23, while the second insulating portion 242 is located between the electrode assembly 22 and the sidewall 211.

[0192] The electrode 25 includes a body 252, and a first fixing portion 251 and a second fixing portion 253 located at each end of the body 252. The first fixing portion 251 is located on the side of the first end wall 212 facing the electrode assembly 22, and the second fixing portion 253 is located on the side of the first end wall 212 facing away from the electrode assembly 22. The first end wall 212 is provided with a mounting through-hole, and the body 252 is at least partially accommodated in the mounting through-hole. The first fixing portion 251 and the second fixing portion 252 are used to clamp a portion of the first end wall 212. The main body 222 includes an active material area 2221 and an insulating area 2222. The insulating area 2222 is located between the active material area 2221 and the first tab 221.

[0193] The second insulating portion 242 includes a connecting portion 2421, a guide portion 2422, and an extending portion 2423, which are sequentially arranged in a direction away from the first insulating portion 241. The inner surface of the guide portion 2422 is inclined toward the sidewall 211 in a direction away from the first insulating portion 241. The thickness of the connecting portion 2421 is equal to that of the first insulating portion 241, while the thicknesses of the connecting portion 2421, the guide portion 2422, and the extending portion 2423 gradually decrease. In one example, the thicknesses of the connecting portion 2421 and the extending portion 2423 remain constant, while the thickness of the guide portion 2422 gradually decreases from a first thickness, the same as that of the connecting portion 2421, to a second thickness, the same as that of the extending portion 2423.

[0194] Along the first direction X, the length h1 of the connection portion 2421, the thickness t1 of the first fixing portion 251, the thickness t2 of the current collecting member 23, and the height t3 of the first electrode tab 221 satisfy: h1 ≤ t1 + t2 + t3. Along the first direction X, the length h1 of the connection portion 2421, the length h2 of the guide portion 2422, the thickness t1 of the first fixing portion 251, the thickness t2 of the current collecting member 23, the height t3 of the first electrode tab 221, and the height w of the insulating region 2222 satisfy: h1 + h2 ≤ t1 + t2 + t3 + w.

[0195] The thickness b1 of the connecting portion 2421 satisfies 0.2mm≤b1≤1mm, the thickness b3 of the extending portion 2423 satisfies 0.02mm≤b3≤0.1mm, and the thickness b2 of the guiding portion 2422 gradually decreases from the thickness b1 of the connecting portion 2421 to the thickness b3 of the extending portion 2423 in a direction away from the first insulating portion 241 .

[0196] A length h1 of the connecting portion 2421 along the first direction X satisfies 0

[0197] ​The inner diameter D of the side wall 211 of the shell satisfies: 44.8mm≤D≤45.5mm; the outer diameter D1 at the intersection of the connecting portion 2421 and the guide portion 2422 satisfies: 43.5mm≤D1≤45.5mm; the outer diameter D2 of the end of the guide portion 2422 away from the connecting portion 2421 satisfies: 44.5mm≤D2≤45.5mm; the outer diameter D3 of the end of the extension portion 2423 away from the guide portion 2422 satisfies: 44.7mm≤D3≤45.5mm, and D1≤D2≤D3≤D.

[0198] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, comprising: A housing including a side wall and a first end wall connected to the side wall; A pole, insulated and mounted on the first end wall; An electrode assembly, located in the housing, comprising a first pole lug, the first pole lug facing the first end wall and electrically connected to the pole; as well as The insulating member comprises a first insulating portion and a second insulating portion, wherein the second insulating portion is arranged around an outer edge of the first insulating portion and protrudes outward from a side where the electrode assembly is located; The first insulating portion is located between the first end wall and the first pole lug, and at least a portion of the second insulating portion is located between the first pole lug and the side wall.

2. The battery cell according to claim 1, wherein: The second insulating portion includes a guide portion, which is located at one end of the second insulating portion away from the first insulating portion. Along a direction away from the first insulating portion, an inner surface of the guide portion is inclined in a direction close to the side wall.

3. The battery cell according to claim 2, wherein: The thickness of the guide portion gradually decreases along a direction away from the first insulating portion.

4. The battery cell according to claim 2 or 3, wherein: The second insulating portion includes a connecting portion, two ends of which are respectively connected to the first insulating portion and the guiding portion, and a thickness of the connecting portion is greater than or equal to a maximum thickness of the guiding portion.

5. The battery cell according to claim 4, wherein: The difference between the thickness of the connecting portion and the thickness of the first insulating portion is less than or equal to 0.2 mm.

6. The battery cell according to claim 5, wherein: The thickness of the connecting portion is smaller than the thickness of the first insulating portion.

7. The battery cell according to claim 5, wherein: The thickness of the connecting portion is equal to the thickness of the first insulating portion.

8. The battery cell according to any one of claims 4 to 7, wherein: The pole comprises a pole body, and a first fixing portion and a second fixing portion respectively located at two ends of the pole body, the first fixing portion is located on a side of the first end wall facing the electrode assembly, the second fixing portion is located on a side of the first end wall away from the electrode assembly, the first end wall is provided with a mounting through hole, the pole body is at least partially accommodated in the mounting through hole, and the first fixing portion and the second fixing portion are used to clamp a portion of the first end wall; The battery cell further includes a current collecting member, at least a portion of which is located between the first electrode tab and the first fixing portion, and is conductively connected to the first electrode tab and the first fixing portion respectively; A portion of the first insulating portion is located between the first fixing portion and the first end wall.

9. The battery cell according to claim 8, wherein: The electrode assembly further includes a main body, the first electrode tab is connected to the main body, the main body includes an active material region and an insulating region, and the insulating region is located between the active material region and the first electrode tab.

10. The battery cell according to claim 9, wherein: Along the direction of the first end wall pointing to the electrode assembly, the connecting portion does not extend beyond an end of the insulating region close to the first end wall.

11. The battery cell according to claim 10, wherein: Along the thickness direction of the first end wall, the length h1 of the connection portion, the thickness t1 of the first fixing portion, the thickness t2 of the current collecting member, and the height t3 of the first electrode tab satisfy: h1≤t1+t2+t3.

12. The battery cell according to any one of claims 9 to 11, wherein: Along the direction of the first end wall pointing toward the electrode assembly, the guide portion does not exceed an end of the insulating region close to the active material region.

13. The battery cell according to claim 12, wherein: Along the thickness direction of the first end wall, the length h1 of the connecting portion, the length h2 of the guiding portion, the thickness t1 of the first fixing portion, the thickness t2 of the current collecting member, the height t3 of the first electrode tab and the height w of the insulating region satisfy: h1+h2≤t1+t2+t3+w.

14. The battery cell according to claim 9, wherein: A receiving groove is formed on a side of the first insulating portion facing the electrode assembly, and the first fixing portion of the pole is at least partially received in the receiving groove.

15. The battery cell according to claim 14, wherein: Along the thickness direction of the first end wall, the depth of the accommodating groove is less than or equal to the thickness of the first fixing portion.

16. The battery cell according to claim 14 or 15, wherein: Along the direction of the first end wall pointing to the electrode assembly, the connecting portion does not extend beyond an end of the insulating region close to the first end wall.

17. The battery cell according to claim 16, wherein: Along the thickness direction of the first end wall, the depth h0 of the accommodating groove, the length h1 of the connecting portion, the thickness t1 of the first fixing portion, the thickness t2 of the current collecting member and the height t3 of the first electrode tab satisfy: h1≤t1+t2+t3-h0.

18. The battery cell according to any one of claims 14 to 17, wherein: Along the direction of the first end wall pointing toward the electrode assembly, the guide portion does not exceed an end of the insulating region close to the electrode assembly.

19. The battery cell according to claim 18, wherein: Along the thickness direction of the first end wall, the depth h0 of the accommodating groove, the length h1 of the connecting portion, the length h2 of the guiding portion, the thickness t1 of the first fixing portion, the thickness t2 of the current collecting member, the height t3 of the first pole ear and the height w of the insulating area satisfy: h1+h2≤t1+t2+t3+w-h0.

20. The battery cell according to any one of claims 9 to 19, wherein: Along the thickness direction of the first end wall, the thickness t1 of the first fixing portion satisfies 0.4 mm ≤ t1 ≤ 1.2 mm; The thickness t2 of the current collecting member satisfies 0.2 mm ≤ t2 ≤ 0.6 mm; The height t3 of the first electrode tab satisfies 0.5 mm ≤ t3 ≤ 1.5 mm; The length h1 of the connecting portion satisfies 0<h1≤3.3mm; The length h2 of the guide portion satisfies 1mm≤h2≤8.5mm.

21. The battery cell according to any one of claims 9 to 20, wherein: The second insulating portion also includes an extension portion, which is connected to an end of the guide portion away from the connection portion, has a thickness less than or equal to a minimum thickness of the guide portion, and is at least partially located between the active material region and the side wall.

22. The battery cell according to claim 21, wherein: The thickness b1 of the connecting portion satisfies 0.2 mm ≤ b1 ≤ 1 mm, and the thickness b3 of the extending portion satisfies 0.02 mm ≤ b3 ≤ 0.1 mm.

23. The battery cell according to claim 22, wherein: The length h3 of the extension portion satisfies 0<h3≤7mm.

24. The battery cell according to claim 22 or 23, wherein: The shell is cylindrical; the outer edge of the first insulating part is circular, and the outer diameter of the second insulating part is less than or equal to the inner diameter of the side wall of the shell.

25. The battery cell according to claim 24, wherein: Along the direction of the first end wall pointing toward the electrode assembly, the outer diameter of the second insulating portion gradually increases.

26. The battery cell according to claim 24 or 25, wherein: An outer diameter D1 at the intersection of the connecting portion and the guiding portion, an outer diameter D2 of an end of the guiding portion away from the connecting portion, and an inner diameter D of the outer shell satisfy the following: D1≤D2≤D.

27. The battery cell according to claim 24 or 25, wherein: The outer diameter D1 of the intersection of the connecting portion and the guiding portion, the outer diameter D2 of the guiding portion at one end away from the connecting portion, the outer diameter D3 of the extending portion at one end away from the guiding portion and the inner diameter D of the outer shell satisfy: D1≤D2≤D3≤D.

28. The battery cell according to claim 27, wherein: The inner diameter D of the side wall of the housing satisfies: 44.8 mm ≤ D ≤ 45.5 mm; The outer diameter D1 of the junction between the connecting portion and the guiding portion satisfies: 43.5 mm ≤ D1 ≤ 45.5 mm; The outer diameter D2 of one end of the guide portion away from the connecting portion satisfies: 44.5 mm ≤ D2 ≤ 45.5 mm; An outer diameter D3 of an end of the extending portion away from the guiding portion satisfies: 44.7 mm ≤ D3 ≤ 45.5 mm.

29. The battery cell according to any one of claims 8 to 27, wherein: The insulating member further includes at least one boss, and the at least one boss is located on a side surface of the first insulating portion close to the electrode assembly for abutting against the current collecting member.

30. The battery cell according to claim 29, wherein: The at least one boss, the first insulating portion, and the second insulating portion are integrally injection-molded.

31. The battery cell according to any one of claims 1 to 30, wherein: The insulating member is connected to the inner surface of the shell by bonding.

32. The battery cell according to any one of claims 1 to 31, wherein: At least one notch is disposed at one end of the second insulating portion away from the first insulating portion.

33. A battery comprising the battery cell according to any one of claims 1 to 32.

34. An electrical device, comprising the battery as claimed in claim 33, wherein the battery is used for providing electrical energy.

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