Battery cell, battery device, and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell part, an electrode part and a pole part, and the shell part comprises a first shell wall; the pole component comprises a pole body, a clamping structure, a first inner insulating part and an outer insulating part; the pole body is connected with the electrode component; the clamping structure is connected with the first shell wall and provided with a clamping groove used for clamping the pole body, the first inner insulating part is located in the clamping groove and located between the inner wall of the clamping structure and the pole body, and the outer insulating part at least partially covers the outer wall of the clamping structure; the clamping structure is provided with a communication part, and the first inner insulating part is connected with the outer insulating part through the communication part. According to the technical scheme of the embodiment of the invention, the insulation reliability between the clamping structure and the confluence component, between the first shell wall and the confluence component and between the clamping structure and the pole body can be improved, the short circuit problem is reduced, and the use reliability of the single battery is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] The battery cells in the related art are prone to short circuit problems, resulting in low reliability of the battery cells. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, which can improve the reliability of use.

[0005] In the first aspect, the present application provides a battery cell, comprising: a shell component, including a first shell wall; an electrode component, housed in the shell component; a pole component, arranged on the first shell wall and comprising a pole body, a clamping structure, and a first inner insulating member and an outer insulating member arranged separately; the pole body is connected to the electrode component; the clamping structure is connected to the first shell wall and has a clamping groove for clamping the pole body, the first inner insulating member is located in the clamping groove and between the inner wall of the clamping structure and the pole body, and the outer insulating member at least partially covers the outer wall of the clamping structure; wherein a connecting portion is provided on the clamping structure, and the first inner insulating member is connected to the outer insulating member through the connecting portion.

[0006] In the technical solution of the embodiment of the present application, the outer insulating part at least partially covers the outer wall of the clamping structure, so that the outer insulating part can separate the clamping structure and the runner component, thereby achieving insulation between the clamping structure and the runner component, and between the first shell wall and the runner component, and a connecting part is provided on the clamping structure, so that the first inner insulating part and the outer insulating part can be connected through the connecting part, which can improve the installation reliability of the outer insulating part, thereby further improving the insulation reliability between the clamping structure and the runner component, and between the first shell wall and the runner component, and the outer insulating part is connected to the first inner insulating part, which can further improve the insulation reliability between the clamping structure and the pole body, thereby reducing the short circuit problem and improving the reliability of the battery cell.

[0007] In some embodiments, the clamping structure includes a clamping member, the clamping member includes a first clamping portion and a second clamping portion connected to each other, the first clamping portion and the second clamping portion together form a clamping groove; the first inner insulating member is at least partially disposed between the first clamping portion and the pole body; the outer insulating member is disposed on the first clamping portion to form the outer wall of the clamping groove; and the connecting portion is disposed on the first clamping portion. In the above technical solution, by configuring the clamping structure to include a first clamping portion and a second clamping portion, the first clamping portion and the second clamping portion are respectively located on both sides of at least a portion of the pole body to limit the movement of the pole body relative to the clamping structure, the outer insulating member can isolate the first clamping portion and the current collector, thereby achieving insulation between the first clamping portion and the current collector, and between the first shell wall and the current collector.

[0008] In some embodiments, the connecting portion includes a notch, which is formed at the notch of the clamping groove and is located at the end of the first clamping portion away from the second clamping portion. In the above technical solution, by providing a notch at the end of the first clamping portion away from the second clamping portion, on the one hand, it is convenient to bend the end of the first clamping portion away from the second clamping portion relative to the second clamping portion, thereby forming a clamping groove, so that the pole body is fixed on the clamping structure, and on the other hand, the outer insulating member and the first inner insulating member can be connected through the notch, thereby improving the installation reliability of the outer insulating member, thereby further improving the insulation reliability between the clamping structure and the current collecting component, and between the first shell wall and the current collecting component.

[0009] In some embodiments, the first clamping portion is bent relative to the second clamping portion to form a clamping groove together with the second clamping portion; the notch extends from the end of the first clamping portion away from the second clamping portion to the bent position. In the above technical solution, by setting the notch to extend from the end of the first clamping portion away from the second clamping portion to the bent position, on the one hand, it can reduce the problems of material stacking and wrinkles in the bending process of the first clamping portion, which is conducive to bending the first clamping portion relative to the second clamping portion, thereby fixing the pole body on the clamping structure, and on the other hand, the bent first clamping portion can compress the first inner insulating member, so that the insulation between the pole body and the first clamping portion is more reliable.

[0010] In some embodiments, the connecting portion is a through hole with a hole wall closed all around, and the through hole is opened in the first clamping portion. In the above technical solution, by providing a through hole on the first clamping portion, the outer insulating member and the first inner insulating member can be connected through the through hole, thereby improving the installation reliability of the outer insulating member, thereby further improving the insulation reliability between the clamping structure and the current collecting component, and between the first shell wall and the current collecting component.

[0011] In some embodiments, the first clamping portion is bent relative to the second clamping portion to form a clamping groove together with the second clamping portion, and the through hole avoids the bent position of the first clamping portion. The through hole avoids the bent position of the first clamping portion, which can reduce the deformation of the bent position that affects the change of the through hole shape, so that the outer insulating member and the first inner insulating member can be fully contacted and connected at the through hole, thereby improving the installation reliability of the outer insulating member.

[0012] In some embodiments, the first clamping portion is divided into two parts according to the bending position, the first part is close to the second clamping portion, the second part is far from the second clamping portion, and the through hole is arranged in the first part. The through hole is arranged in the first part of the first clamping portion, which can reduce the influence of the first clamping portion on the through hole when bending, which is conducive to improving the installation reliability of the external insulating member, thereby further improving the insulation reliability between the clamping structure and the current collecting component, and between the first shell wall and the current collecting component.

[0013] In some embodiments, the number of the connecting parts is multiple, and the multiple connecting parts are arranged at intervals around the circumference of the pole body on the first clamping part. In the above technical solution, by providing multiple connecting parts, the first inner insulating member and the outer insulating member are connected at the positions where the multiple connecting parts are located, that is, the first inner insulating member and the outer insulating member are connected at multiple positions on the circumference of the pole body, which can further improve the installation reliability of the outer insulating member, thereby greatly improving the insulation reliability between the clamping structure and the current collecting component, and between the first shell wall and the current collecting component.

[0014] In some embodiments, the clamping structure is in the shape of a circular ring, and the connecting portion is arranged at any position in the circumference of the first clamping portion around the pole body; or, the clamping structure is in the shape of a long strip and includes a straight line segment and an arc segment, and the connecting portion is at least opened at the intersection of the straight line segment and the arc segment. In the above technical scheme, when the clamping structure is in the shape of a circular ring, the connecting portion can be arranged at any position in the circumference of the first clamping portion around the pole body, which is more flexible and can also improve the connection reliability of the first inner insulating member and the outer insulating member, thereby improving the installation reliability of the outer insulating member. When the clamping structure is in the shape of a long strip, the connecting portion is arranged at the intersection of the straight line segment and the arc segment, which can reduce the influence of the first clamping member on the size of the connecting portion when bending, and more connecting portions can be arranged in the straight line segment, thereby improving the installation reliability of the outer insulating member, and further improving the insulation reliability between the clamping structure and the current collecting component, and between the first shell wall and the current collecting component.

[0015] In some embodiments, the clamping structure further comprises a main body, the first clamping part and the second clamping part are arranged on the main body, and the main body is connected to the first shell wall. The structure of the main body is simple, and by arranging the main body, the main body can be arranged between the clamping member and the first shell wall, so that the clamping member is fixed on the first shell wall.

[0016] In some embodiments, the body and the clamp are integrally arranged; or, the body, the clamp and the first shell wall are integrally arranged. The body and the clamp are integrally arranged, which not only saves the step of connecting the two, which is beneficial to improving production efficiency, but also improves the structural strength of the clamp structure, which is beneficial to improving the reliability of the clamp structure; the body, the clamp and the first shell wall are integrally arranged, which saves the step of connecting the three, which is beneficial to improving production efficiency, and can also improve the structural strength of the first shell wall and the clamp structure, which is beneficial to improving the reliability of the first shell wall and the clamp structure.

[0017] In some embodiments, the body is welded to the first shell wall. In the above technical solution, by welding the body to the first shell wall, the assembly steps of the clamping structure, the pole body, the first inner insulator, the outer insulator and the first shell wall can be simplified, which is conducive to improving production efficiency.

[0018] In some embodiments, the thickness of the main body is not equal to that of the first shell wall; and / or, the thickness of the first clamping portion is not equal to that of the second clamping portion; and / or, at least one of the first clamping portion and the second clamping portion is not equal to that of the main body; and / or, at least one of the first clamping portion and the second clamping portion is not equal to that of the first shell wall. In the above technical solution, the insulation performance and reliability of the pole component can be improved as needed by adjusting the thickness of the first shell wall, the thickness of the first clamping portion of the clamping structure, the thickness of the second clamping portion, and the thickness of the main body.

[0019] In some embodiments, a side surface of the outer insulating member facing away from the first clamping portion is smoothly transitionally connected to an end surface of the pole body facing away from the electrode component. This arrangement can simplify the external structure of the battery cell and make the battery cell beautiful in appearance, and can reduce the stop effect of the outer insulating member on the current collecting component and improve the connection reliability between the pole body and the current collecting component.

[0020] In some embodiments, the end surface periphery of one end of the pole body away from the electrode component has a step, and the outer insulating member at least partially extends to the step. In the above technical solution, by providing a step on the pole body, the contact area between the outer insulating member and the pole body can be increased, thereby increasing the connection reliability between the outer insulating member and the pole body, making the insulation reliability between the current collecting component and the clamping structure higher, and the outer insulating member is connected to the first inner insulating member, which can completely separate the pole body and the clamping structure, so that the insulation reliability between the pole body and the clamping structure is higher.

[0021] In some embodiments, the step is an annular structure, and the outer insulating member is arranged around the first clamping portion. By arranging the step as an annular structure, the contact area between the outer insulating member and the pole body can be further increased, thereby increasing the connection reliability between the outer insulating member and the pole body, and making the insulation reliability between the busbar component and the clamping structure higher.

[0022] In some embodiments, the first clamping portion includes a first extension section, a second extension section and a circular arc extension section, the first extension section is arranged around the circumference of the pole body and connected to the second clamping portion, the second extension section is located on the side of the pole body away from the electrode component and is arranged with a relative spacing from the second clamping portion, and the first extension section and the second extension section are connected through the circular arc extension section; the outer insulating member includes a first insulating section, a second insulating section and a circular arc insulation section, the first insulating section covers the side of the first extension section away from the pole body, the second insulating section covers the side of the second extension section away from the pole body, and the first insulating section and the second insulating section are connected through the circular arc insulation section. In the above technical solution, by setting the first clamping portion to include the first extension section, the second extension section and the circular arc extension section, and setting the outer insulating member to include the first insulating section, the second insulating section and the circular arc insulation section, the damage of the pole body to the outer insulating member is reduced, thereby improving the insulation reliability of the outer insulating member.

[0023] In some embodiments, the number of the second extension sections is multiple, and the multiple second extension sections are arranged at intervals in the circumferential direction of the pole body, and two adjacent second extension sections define at least a portion of the connecting portion. In the above technical solution, by setting the first clamping portion to include multiple second extension sections, and using the connecting portion defined between two adjacent second extension sections, on the one hand, the problems of material stacking and wrinkling in the bending process of the first clamping portion can be reduced, which is conducive to bending the first clamping portion relative to the second clamping portion, thereby fixing the pole body on the clamping structure, and on the other hand, the bent first clamping portion can compress the first inner insulating member, so that the insulation between the pole body and the first clamping portion is more reliable.

[0024] In some embodiments, the side surface of the second insulating section away from the second extension section is in the same plane as the end surface of the pole body away from the electrode component. This arrangement can make the end surface of the pole component away from the electrode component smoother, reduce the interference of the pole component with other components outside the shell component (such as the current collecting component, etc.), and improve the reliability of the battery cell.

[0025] In some embodiments, the circumferential side of the pole body has a flange portion, and in the thickness direction of the first shell wall, the flange portion is located between the first clamping portion and the second clamping portion, and the first inner insulating member is at least partially located between the first clamping portion and the flange portion. In the above technical solution, by arranging the flange portion on the circumferential side of the pole body, the first clamping portion and the second clamping portion are respectively located on both sides of the flange portion in the thickness direction of the first shell wall to limit the pole body from moving relative to the clamping structure in the direction away from or close to the electrode component, and the structure of the flange portion is simple and easy to process; by clamping the first inner insulating member between the first clamping portion and the flange portion, it is beneficial to insulate the matching position of the clamping structure and the pole body in a shorter path, improve the reliability of insulation, and help reduce the size of the first inner insulating member, and it is easy to clamp it, so that the insulation performance is not easy to fail, and improve the insulation effect.

[0026] In some embodiments, the pole component also includes a sealing ring, which is arranged between the second clamping portion and the flange portion; or, the pole component also includes an integrally arranged sealing ring, which is located simultaneously between the first clamping portion and the flange portion, and between the second clamping portion and the flange portion; or, the pole component also includes a sealing ring and a second inner insulating member, the sealing ring is arranged between the connecting position of the first clamping portion and the second clamping portion and the flange portion, and the second inner insulating member is arranged between the position of the second clamping portion away from the first clamping portion and the flange portion. In the above technical scheme, by arranging a sealing ring between the second clamping part and the flange part, the sealing between the pole body and the clamping structure can be achieved, so that the pole component itself has self-sealing properties, which is convenient for the installation and coordination of the pole component and the first shell wall, and can save installation time and cost; by arranging the integrally arranged sealing ring between the first clamping part and the flange part, and between the second clamping part and the flange part at the same time, multi-directional and multi-position sealing coordination can be achieved, reducing sealing failure, which is beneficial to improving the sealing effect of the sealing ring, thereby meeting the required sealing requirements; by adopting the sealing ring and the second inner insulating part, and cooperating with the first inner insulating part, by reasonably arranging the sealing ring, the first inner insulating part and the second inner insulating part between the pole body and the clamping structure, insulation and sealing failures can be reduced, and the insulation and sealing effect between the pole body and the clamping structure can be better improved, thereby improving the reliability of the battery cell.

[0027] In some embodiments, the end face of one end of the pole body facing the electrode component is flush with the surface of one side of the first shell wall facing the electrode component; or the end face of one end of the pole body facing the electrode component is located on the side of the surface of one side of the first shell wall facing the electrode component away from the electrode component. In the above technical solution, by making the end face of one end of the pole body facing the electrode component flush with the surface of one side of the first shell wall facing the electrode component, the assembly of the first shell wall and the pole component is made flatter on the side facing the electrode component, which can reduce the interference of the pole component with other components in the shell component and simplify the structure of other components in the shell component; setting the end face of one end of the pole body facing the electrode component to be located on the side of the surface of one side of the first shell wall facing the electrode component away from the electrode component can reduce the space occupied by the conductive part in the accommodating cavity, so that the accommodating cavity has a larger space to accommodate the active material coating part, which is conducive to increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell.

[0028] In some embodiments, the pole body further includes an insulating bracket, which is disposed on a side of the clamping structure close to the electrode component, and the pole body includes an inner convex portion of the pole located in the inner ring area of ​​the insulating bracket, which protrudes toward the inner side of the first shell wall relative to the clamping structure; a side surface of the inner convex portion of the pole close to the electrode component is flush with a side surface of the insulating bracket close to the electrode component, or is located on a side of the side surface of the insulating bracket close to the electrode component away from the electrode component. In the above technical solution, by providing the insulating bracket, both the active material coating portion of the electrode component and the clamping structure can be insulated, and the active material coating portion of the electrode component and the first shell wall can be insulated, which is beneficial to improving the reliability of the battery cell.

[0029] In some embodiments, the shell component includes a shell body with an opening at at least one end and a shell cover disposed at the opening; wherein the wall of the shell body opposite to the opening is the first shell wall; or, the shell cover is the first shell wall. The structural design of the shell component is flexible, and the setting position of the pole component is flexible.

[0030] In some embodiments, a pressure relief device is further included, which is disposed on the housing component and is located on the same side or on the opposite side as the pole component. By providing the pressure relief device, when the pressure in the housing component exceeds a preset value, the pressure can be directional-released through the pressure relief device, thereby improving the safety and reliability of the battery cell.

[0031] In a second aspect, the present application provides a battery device, comprising the battery cell of the above embodiment. In the technical solution of the embodiment of the present application, the performance of the battery device can be improved by using the above battery cell.

[0032] In a third aspect, the present application provides an electric device, comprising the battery device of the above embodiment. In the technical solution of the embodiment of the present application, the working performance of the electric device can be improved by adopting the above battery device.

[0033] 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

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0035] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0036] Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0037] Figure 3 A schematic diagram of the structure of a battery cell in some embodiments of the present application;

[0038] Figure 4 for Figure 3 The structural explosion diagram of the battery cell shown in;

[0039] Figure 5 A top view of a battery cell according to some embodiments of the present application;

[0040] Figure 6 For along Figure 5 Sectional view along line AA;

[0041] Figure 7 A schematic diagram of the structure of a pole component of a battery cell on a first shell wall in some embodiments of the present application;

[0042] Figure 8 A schematic diagram of the structure of a pole component of a battery cell in some embodiments of the present application;

[0043] Fig. 9 for Figure 8 A top view of the pole component shown in ;

[0044] Fig.10 For along Fig. 9 The structural cross-sectional view of the line B1-B1 shown in FIG.

[0045] Fig.11 for Fig.10 An enlarged view of the C1 section shown in;

[0046] Fig.12 for Figure 8 The structural exploded view of the pole component shown in FIG.

[0047] Fig.13 for Fig.12 An enlarged view of the D1 portion shown in ;

[0048] Fig.14 A partial enlarged view of a pole component of a battery cell according to some other embodiments of the present application;

[0049] Fig.15 A top view of a pole component of a battery cell in some embodiments of the present application on a first shell wall;

[0050] Fig.16 For along Fig.15 The structural cross-sectional view of the line B2-B2 shown in FIG.

[0051] Fig.17 For along Fig.15 A structural cross-sectional view of the C2-C2 line shown in FIG.

[0052] Fig.18 Schematic diagram of the structure of the pole component of the battery cell of other embodiments of the present application;

[0053] Fig.19 A schematic diagram of the structure of a pole component of a battery cell in some other embodiments of the present application;

[0054] Fig. 20 Schematic diagram of the structure of the pole component of the battery cell according to other embodiments of the present application.

[0055] The reference numerals in the specific implementation manner are as follows:

[0056] Vehicle 1000,

[0057] Battery device 100, box assembly 101, box cover 1011, box 1012, controller 200, motor 300,

[0058] Battery cell 10,

[0059] Shell component 1, shell body 11, opening 110, shell cover 12, first shell wall 13, mounting hole 131, second shell wall 14,

[0060] Electrode member 2, active material coating portion 21, conductive portion 22,

[0061] Pole component 3, receiving groove 301,

[0062] The pole body 31, the step 311, the flange 312, the pole inner protrusion 313,

[0063] The clamping structure 32 includes a clamping groove 3201, a connecting portion 3202, a notch 3202a, a through hole 3202b, a main body 321, a clamping member 322, a first clamping portion 3221, a first extension section 32211, a second extension section 32212, an arc extension section 32213, a second clamping portion 3222,

[0064] Insulation sealing structure 33, inner insulating member 331, first inner insulating member 3311, second inner insulating member 3312, sealing ring 332, first sealing part 3321, second sealing part 3322, third sealing part 3323,

[0065] The outer insulating member 34, the first insulating section 341, the second insulating section 342, the arc insulating section 343,

[0066] Pressure relief device 4, insulating film 5, insulating bracket 6. DETAILED DESCRIPTION

[0067] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used 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 technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0069] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0070] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood 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 the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after 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, which 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, and therefore should not be understood as a limitation on the embodiments of the present application.

[0074] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0075] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0076] In the related art, after the poles of the battery cells are connected to the busbar components, when the battery cells are subjected to vibration, collision or other external forces, it is very likely that the busbar components will come into direct contact with other structures of the battery cells (such as the shell, etc.). Once this happens, a short circuit will be formed, which will not only reduce the reliability of the battery cells, but also cause a huge current to be generated inside the battery cells instantly, seriously damaging the battery itself, and may also cause dangerous situations.

[0077] To this end, an embodiment of the present application proposes a battery cell, which provides an external insulating part on the outer wall of the clamping structure and a connecting part on the clamping structure, so that the first inner insulating part and the outer insulating part can be connected through the connecting part. The insulation reliability between the clamping structure and the busbar component, between the first shell wall and the busbar component, and between the clamping structure and the pole body can be improved, thereby improving the reliability of the battery cell.

[0078] The battery cell disclosed in the embodiments of the present application can be used in an electrical device that uses a battery device as a power source or in various energy storage systems that use a battery device as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0079] 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.

[0080] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0081] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0082] Please refer to Figure 2 , Figure 2 The structure of the battery device 100 provided in some embodiments of the present application is exploded. The battery device 100 includes a box assembly 101 and a battery cell assembly, and the battery cell assembly is accommodated in the box assembly 101.

[0083] The box assembly 101 is used to provide a storage space for the battery cell 10, and the box assembly 101 can adopt a variety of structures. In some embodiments, the box assembly 101 can include a box 1012 and a box cover 1011, the box 1012 and the box cover 1011 cover each other, and the box 1012 and the box cover 1011 together define a storage space for accommodating the battery cell 10. The box 1012 can be a hollow structure with one end open, and the box cover 1011 can be a plate-like structure, and the box cover 1011 covers the open side of the box 1012, so that the box 1012 and the box cover 1011 together define a storage space; the box 1012 and the box cover 1011 can also be hollow structures with one side open, and the open side of the box cover 1011 covers the open side of the box 1012. Of course, the box assembly 101 formed by the box 1012 and the box cover 1011 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0084] The battery cell assembly may include a plurality of battery cells 10, and the plurality of battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the plurality of battery cells 10 are both connected in series and in parallel. The plurality of battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the plurality of battery cells 10 is accommodated in the box assembly 101; of course, the battery device 100 may also be a plurality of battery cells 10 connected in series, in parallel, or in a mixed connection to form a battery device 100 module, and then the plurality of battery device 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box assembly 101. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between the plurality of battery cells 10.

[0085] Each battery cell 10 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 may be cylindrical, flat, rectangular, or in other shapes.

[0086] Please refer to Figure 3-Figure 6 , Figure 3 A schematic diagram of the structure of a battery cell 10 according to some embodiments of the present application; Figure 4 for Figure 3 An exploded view of the structure of the battery cell 10 shown in FIG. Figure 5 A top view of a battery cell 10 according to some embodiments of the present application; Figure 6 For along Figure 5 The battery cell 10 includes a housing component 1, an electrode component 2, a pole component 3 and other functional components.

[0087] The housing component 1 has a receiving cavity therein, and the housing component 1 includes a housing cover 12 and a housing body 11, and the housing cover 12 and the housing body 11 form the receiving cavity. Figure 3 As shown, the X direction is the length direction of the shell component 1 , the Y direction is the thickness direction of the shell component 1 , and the Z direction is the height direction of the shell component 1 .

[0088] The shell cover 12 refers to a component that covers the opening 110 of the shell body 11 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the shell cover 12 can be adapted to the shape of the shell body 11 to match the shell body 11. Optionally, the shell cover 12 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the shell cover 12 is not easy to deform when it is squeezed and collided, so that the battery cell 10 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the shell cover 12. The electrode terminal can be used to electrically connect with the electrode component 2 for outputting or inputting electrical energy of the battery cell 10. In some embodiments, the shell cover 12 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The material of the shell cover 12 can also be 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.

[0089] The shell body 11 is a component used to cooperate with the shell cover 12 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode component 2, the electrolyte and other components. The shell body 11 and the shell cover 12 can be independent components, and an opening 110 can be set on the shell body 11, and the shell cover 12 is made to cover the opening 110 at the opening 110 to form the internal environment of the battery cell 10. Without limitation, the shell cover 12 and the shell body 11 can also be integrated. Specifically, the shell cover 12 and the shell body 11 can form a common connection surface before other components enter the shell, and when the interior of the shell body 11 needs to be encapsulated, the shell cover 12 is made to cover the shell body 11. The shell body 11 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell body 11 can be determined according to the specific shape and size of the electrode component 2. The material of the shell body 11 can be various, 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 component 2 is a component in the battery cell 10 where an electrochemical reaction occurs, and is housed in the shell component 1. Specifically, the shell body 11 may contain one or more electrode components 2. The electrode component 2 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode component 2, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear portion. During the charge and discharge process of the battery device 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ear portion connects the electrode terminal to form a current loop.

[0091] According to some embodiments of the present application, referring to Figure 4 and Figure 6 , and please refer to Figure 7 , Figure 7 The schematic diagram is a structural diagram of the pole component 3 of the battery cell 10 of some embodiments of the present application on the first shell wall 13. The shell component 1 includes the first shell wall 13, which is involved in forming a receiving cavity, and the material of the first shell wall 13 is not limited.

[0092] The electrode component 2 is accommodated in the shell component 1. For example, the electrode component 2 includes an active material coating portion 21 and a conductive portion 22, the active material coating portion 21 is accommodated in the accommodating cavity, the conductive portion 22 is connected to the active material coating portion 21, and the conductive portion 22 may include a pole ear portion, and the pole ear portion includes a multi-layer pole ear sheet.

[0093] The pole component 3 is arranged on the first shell wall 13, and the pole body 31 is connected to the electrode component 2. For example, a mounting hole 131 may be formed on the first shell wall 13, the pole component 3 is arranged at the mounting hole 131, and the pole component 3 is connected to the electrode component 2, so that the pole component 3 blocks the mounting hole 131. For example, the first shell wall 13 may be integrally formed with at least part of the structure of the pole component 3.

[0094] Please refer to Figure 8-Figure 11 , Figure 8 It is a schematic structural diagram of a pole component 3 of a battery cell 10 in some embodiments of the present application; Fig. 9 for Figure 8 A top view of the pole component 3 shown in FIG. Fig.10 For along Fig. 9 The structural cross-sectional view of the line B1-B1 shown in FIG. Fig.11 for Fig.10The pole component 3 includes a pole body 31 and a clamping structure 32. The pole body 31 is connected to the electrode component 2. The clamping structure 32 is connected to the first shell wall 13. The clamping structure 32 has a clamping groove 3201. The clamping groove 3201 is used to clamp the pole body 31, so that the pole body 31 can be fixedly installed on the clamping structure 32. The shapes of the clamping structure 32 and the pole body 31 are not limited. For example, any of them can be processed into a circle, an ellipse, a rectangle, a rectangle with an R corner, etc.

[0095] Please refer again Fig.10 and Fig.11 The pole component 3 further includes a first inner insulating member 3311, which is located in the clamping groove 3201 and between the inner wall of the clamping structure 32 and the pole body 31. In other words, the first inner insulating member 3311 is clamped between the pole body 31 and the groove wall of the clamping groove 3201 to achieve insulation between the pole body 31 and the clamping structure 32, so that the pole component 3 itself has self-insulation, which facilitates the installation and matching of the pole component 3 and the first shell wall 13, and can save installation time and cost.

[0096] Furthermore, the pole part 3 further includes an outer insulating member 34, which is separately arranged from the first inner insulating member 3311, and the outer insulating member 34 at least partially covers the outer wall of the clamping structure 32. The pole body 31 can be electrically connected to the busbar. The arrangement of the outer insulating member 34 can separate the clamping structure 32 and the busbar, so that the clamping structure 32 and the busbar, and the first shell wall 13 and the busbar are insulated.

[0097] According to the matching requirements with the pole body 31 and the clamping structure 32, the first inner insulating part 3311 and the outer insulating part 34 can be set as basically incompressible insulating parts without sealing effect (such as plastic parts), or the first inner insulating part 3311 and the outer insulating part 34 can be set as compressible insulating parts with sealing effect (such as elastic rubber parts) to meet different actual requirements.

[0098] Please refer to Figure 12-14 , Fig.12 for Figure 8 The structural exploded view of the pole component 3 shown in FIG. Fig.13 for Fig.12 An enlarged view of the D1 portion shown in ; Fig.14 It is a partial enlarged view of the pole component 3 of the battery cell 10 of some other embodiments of the present application. The clamping structure 32 is provided with a connecting portion 3202, and the first inner insulating member 3311 is connected to the outer insulating member 34 through the connecting portion 3202. In other words, part of the structure of the first inner insulating member 3311 and / or part of the structure of the outer insulating member 34 extends into the connecting portion 3202, so that the two are connected.

[0099] For example, after the first shell wall 13 and the pole component 3 without the outer insulating member 34 are assembled, the assembly can be placed in a mold, and then a melt for forming the outer insulating member 34 can be injected into the mold. The melt can be fused with the first inner insulating member 3311 through the connecting portion 3202. After the melt solidifies, the outer insulating member 34 is formed, and the outer insulating member 34 is connected to the first inner insulating member 3311.

[0100] For example, the outer insulating member 34 can also be a preformed structure. After the first shell wall 13 and the pole component 3 without the outer insulating member 34 are assembled, the outer insulating member 34 can be attached to the outer wall of the clamping groove 3201 formed by the clamping structure 32, and the outer insulating member 34 can partially pass through the connecting portion 3202 to contact or connect with the first inner insulating member 3311.

[0101] In the technical solution of the embodiment of the present application, the outer insulating member 34 at least partially covers the outer wall of the clamping structure 32, so that the outer insulating member 34 can separate the clamping structure 32 and the busbar component, thereby achieving insulation between the clamping structure 32 and the busbar component, and between the first shell wall 13 and the busbar component, and a connecting portion 3202 is provided on the clamping structure 32, so that the first inner insulating member 3311 and the outer insulating member 34 can be connected through the connecting portion 3202, which can improve the installation reliability of the outer insulating member 34, thereby further improving the insulation reliability between the clamping structure 32 and the busbar component, and between the first shell wall 13 and the busbar component, and the outer insulating member 34 is connected to the first inner insulating member 3311, which can further improve the insulation reliability between the clamping structure 32 and the pole body 31, thereby reducing the short circuit problem and improving the reliability of the battery cell 10.

[0102] Please refer again Fig.10 and Fig.11 The clamping structure 32 includes a clamping member 322 , and the clamping member 322 includes a first clamping portion 3221 and a second clamping portion 3222 connected to each other. The first clamping portion 3221 and the second clamping portion 3222 together form a clamping groove 3201 .

[0103] Specifically, the first clamping portion 3221 can be located on the side of the second clamping portion 3222 away from the electrode component 2, and the pole body 31 partially extends into the clamping groove 3201. The first clamping portion 3221 can limit the movement of the pole body 31 relative to the clamping structure 32 in the direction away from the electrode component 2, and the second clamping portion 3222 can limit the movement of the pole body 31 relative to the clamping structure 32 in the direction close to the electrode component 2.

[0104] Among them, the first inner insulator 3311 is at least partially disposed between the first clamping portion 3221 and the pole body 31 to achieve insulation between the first clamping portion 3221 of the clamping structure 32 and the pole body 31. By way of example, the first inner insulator 3311 may be entirely disposed between the first clamping portion 3221 and the pole body 31. By way of example, a portion of the first inner insulator 3311 may be disposed between the first clamping portion 3221 and the pole body 31, and another portion of the first inner insulator 3311 may be disposed between the second clamping portion 3222 and the pole body 31.

[0105] Furthermore, the outer insulating member 34 can be arranged on the first clamping portion 3221 to form the outer wall of the clamping groove 3201, and the connecting portion 3202 is arranged on the first clamping portion 3221, that is, the outer insulating member 34 can be arranged on the side of the first clamping portion 3221 away from the clamping groove 3201, and the connecting portion 3202 connects the clamping groove 3201 and the space where the side of the first clamping portion 3221 away from the clamping groove 3201 is located, so that the first inner insulating member 3311 and the outer insulating member 34 can be connected through the connecting portion 3202 on the first clamping portion 3221.

[0106] In the above technical solution, by setting the clamping structure 32 to include a first clamping portion 3221 and a second clamping portion 3222, the first clamping portion 3221 and the second clamping portion 3222 are respectively located on both sides of at least a portion of the pole body 31 to limit the movement of the pole body 31 relative to the clamping structure 32, and the external insulating member 34 can isolate the first clamping portion 3221 and the busbar component, thereby achieving insulation between the first clamping portion 3221 and the busbar component, and between the first shell wall 13 and the busbar component.

[0107] There may be a gap between the end of the first clamping portion 3221 away from the second clamping portion 3222 and the outer periphery of the pole body 31, and the first inner insulating member 3311 and the outer insulating member 34 may also be connected at the gap. For example, a portion of the first inner insulating member 3311 extends into the gap between the first clamping portion 3221 and the pole body 31, so that the first inner insulating member 3311 is connected to the outer insulating member 34. For example, a portion of the outer insulating member 34 extends into the gap between the first clamping portion 3221 and the pole body 31, so that the first inner insulating member 3311 is connected to the outer insulating member 34.

[0108] Please refer again Fig.12 and Fig.13 In some embodiments, the communication portion 3202 includes a notch 3202a, which is formed at the notch of the clamping groove 3201, and the notch 3202a is located at the end of the first clamping portion 3221 away from the second clamping portion 3222. There may be multiple notches 3202a, which are spaced apart in the circumferential direction of the first clamping portion 3221 around the pole body 31.

[0109] In the above technical solution, by setting a notch 3202a at the end of the first clamping portion 3221 away from the second clamping portion 3222, on the one hand, it is beneficial to bend the end of the first clamping portion 3221 away from the second clamping portion 3222 relative to the second clamping portion 3222, thereby forming a clamping groove 3201, so that the pole body 31 is fixed on the clamping structure 32; on the other hand, the outer insulating member 34 and the first inner insulating member 3311 can be connected through the notch 3202a, thereby improving the installation reliability of the outer insulating member 34, thereby further improving the insulation reliability between the clamping structure 32 and the collector component, and between the first shell wall 13 and the collector component.

[0110] In some embodiments, the first clamping portion 3221 is bent relative to the second clamping portion 3222 to form a clamping groove 3201 together with the second clamping portion 3222 , and the notch 3202a extends from the end of the first clamping portion 3221 away from the second clamping portion 3222 to the bent position.

[0111] Specifically, the first clamping portion 3221 includes a first extension section 32211, a second extension section 32212 and an arc extension section 32213. The first extension section 32211 is arranged on the circumferential side of the pole body 31, and the first extension section 32211 is connected to the second clamping portion 3222. The second extension section 32212 is located on the side of the pole body 31 away from the electrode component 2, and the second extension section 32212 and the second clamping portion 3222 are arranged relatively spaced apart. The first extension section 32211 and the second extension section 32212 are connected by the arc extension section 32213, and the arc extension section 32213 is the position where the first clamping portion 3221 is bent. The notch 3202a can extend from the end of the second extension section 32212 away from the first extension section 32211 to the arc extension section 32213.

[0112] In the above technical solution, by setting the notch 3202a to extend from the end of the first clamping portion 3221 away from the second clamping portion 3222 to the bending position, on the one hand, the problems of material stacking and wrinkles in the first clamping portion 3221 during the bending process can be reduced, which is conducive to bending the first clamping portion 3221 relative to the second clamping portion 3222, thereby fixing the pole body 31 on the clamping structure 32; on the other hand, the bent first clamping portion 3221 can press the first inner insulating member 3311, so that the insulation between the pole body 31 and the first clamping portion 3221 is more reliable.

[0113] Please refer again Fig.14In some embodiments, the communication portion 3202 is a through hole 3202b with a hole wall that is closed all around, and the through hole 3202b is opened in the first clamping portion 3221, that is, the through hole 3202b passes through the first clamping portion 3221 to form the inner wall and the outer wall of the clamping groove 3201. There may be multiple through holes 3202b, and the multiple through holes 3202b are arranged at intervals in the circumferential direction of the first clamping portion 3221 around the pole body 31. The through holes 3202b may be round holes, square holes, etc.

[0114] In the above technical solution, by setting a through hole 3202b on the first clamping portion 3221, the outer insulating member 34 and the first inner insulating member 3311 can be connected through the through hole 3202b, thereby improving the installation reliability of the outer insulating member 34, thereby further improving the insulation reliability between the clamping structure 32 and the busbar component, and between the first shell wall 13 and the busbar component.

[0115] In some embodiments, the first clamping portion 3221 is bent relative to the second clamping portion 3222 to form a clamping groove 3201 together with the second clamping portion 3222 , and the through hole 3202 b avoids the bent position of the first clamping portion 3221 .

[0116] The through hole 3202b can be processed before the first clamping part 3221 is bent. Since the first clamping part 3221 after the through hole 3202b is processed is subjected to large deformation after the material at the bending position is squeezed or stretched during the bending process, in order to reduce the influence of the deformation at the bending position on the change of the shape of the through hole 3202b, the through hole 3202b needs to be avoided from the bending position of the first clamping part 3221, so that the outer insulating member 34 and the first inner insulating member 3311 can be fully contacted and connected at the through hole 3202b, thereby improving the installation reliability of the outer insulating member 34.

[0117] Please refer again Fig.14 In some embodiments, the first clamping portion 3221 is divided into two parts according to the bending position (such as the arc extension section 32213), the part close to the second clamping portion 3222 is the first part (such as the first extension section 32211), and the part away from the second clamping portion 3222 is the second part (such as the second extension section 32212), and the through hole 3202b is arranged in the first part.

[0118] After the first clamping portion 3221 is bent, the first part of the first clamping portion 3221 has the smallest deformation or even almost no deformation, while the bent position of the first clamping portion 3221 and the second part may have problems such as material stacking and wrinkles. That is, the bent position of the first clamping portion 3221 and the second part are deformed more greatly than the first part, making it difficult to meet the design requirements.

[0119] Therefore, setting the through hole 3202b in the first part of the first clamping portion 3221 can reduce the impact of the first clamping portion 3221 on the through hole 3202b when bending, which is beneficial to improving the installation reliability of the external insulating member 34, thereby further improving the insulation reliability between the clamping structure 32 and the busbar component, and between the first shell wall 13 and the busbar component.

[0120] Please refer again Fig.12 In some embodiments, there are multiple communicating portions 3202 , and the multiple communicating portions 3202 are spaced apart in the circumferential direction around the pole body 31 on the first clamping portion 3221 .

[0121] The locations of the plurality of connecting portions 3202 may be selected according to the shapes of the pole body 31 and the clamping structure 32. For example, the pole body 31 and the clamping structure 32 are circular, and the plurality of connecting portions 3202 may be evenly and spacedly arranged in the circumferential direction of the pole body 31. For example, the pole body 31 and the clamping structure 32 are rectangular, rectangular with R corners, etc., and the plurality of connecting portions 3202 may be symmetrically distributed at the positions where the two long sides of the pole body 31 are located.

[0122] In the above technical solution, by providing a plurality of connecting portions 3202, the first inner insulating member 3311 and the outer insulating member 34 are connected at the positions where the plurality of connecting portions 3202 are located, that is, the first inner insulating member 3311 and the outer insulating member 34 are connected at a plurality of positions on the circumference of the pole body 31, which can further improve the installation reliability of the outer insulating member 34, thereby greatly improving the insulation reliability between the clamping structure 32 and the busbar component, and between the first shell wall 13 and the busbar component.

[0123] In some embodiments, the clamping structure 32 is annular, and the connecting portion 3202 is disposed at any position of the first clamping portion 3221 in the circumferential direction around the pole body 31 .

[0124] Since the clamping structure 32 is in a circular ring shape, during the bending of the first clamping portion 3221 relative to the second clamping portion 3222, the deformation degree of the first clamping portion 3221 at different circumferential positions around the pole body 31 is relatively uniform. Therefore, if the connecting portion 3202 is set at different circumferential positions of the first clamping portion 3221 around the pole body 31, the size change of the connecting portion 3202 is almost the same.

[0125] Therefore, in the above technical solution, when the clamping structure 32 is in a circular ring shape, the connecting portion 3202 can be set at any position in the circumference of the first clamping portion 3221 around the pole body 31, which makes the selection more flexible and can also improve the connection reliability between the first inner insulating member 3311 and the outer insulating member 34, thereby improving the installation reliability of the outer insulating member 34.

[0126] Please refer again Fig.12 In other embodiments, the clamping structure 32 is in the shape of an elongated strip, and the clamping structure 32 includes a straight line segment and an arc segment, and the connecting portion 3202 is at least opened at the intersection of the straight line segment and the arc segment.

[0127] Since the clamping structure 32 is in the shape of an elongated strip, during the process of bending the first clamping portion 3221 relative to the second clamping portion 3222, problems such as material stacking and wrinkles may occur in the first clamping portion 3221 at the position where the arc segment is located. That is, the degree of deformation of the first clamping portion 3221 at the position where the arc segment is located is relatively large. Therefore, if the connecting portion 3202 is set at the position where the arc segment is located, the size of the connecting portion 3202 may change significantly, which may make it difficult to meet the design requirements.

[0128] Therefore, in the above technical solution, the connecting portion 3202 is arranged at the intersection of the straight segment and the arc segment, which can not only reduce the influence of the first clamping portion 3221 on the size of the connecting portion 3202 when bending, but also arrange more connecting portions 3202 in the straight segment, thereby improving the installation reliability of the external insulating member 34, and further improving the insulation reliability between the clamping structure 32 and the convergence component, and between the first shell wall 13 and the convergence component.

[0129] Specifically, the clamping structure 32 is a long strip ring structure, and the clamping structure 32 includes two straight segments and two arc segments, the two arc segments are arranged oppositely, one arc segment is connected between one end of the two straight segments, and the other arc segment is connected between the other ends of the two straight segments, and the intersection of the adjacent straight segments and the arc segments can be provided with a connecting portion 3202. For example, the connecting portions 3202 can be provided at both ends of each straight segment and the intersection of the two arc segments, that is, at least four connecting portions 3202 can be provided on the first clamping portion 3221.

[0130] Of course, the number of the connecting parts 3202 and the location of each connecting part 3202 can also be selected according to the length of the straight line segment. For example, if the length of the straight line segment is long, in addition to setting the connecting part 3202 at the intersection of the straight line segment and the arc segment, one or more connecting parts 3202 can also be set at the middle position of the straight line segment, so that the outer insulating member 34 and the first inner insulating member 3311 are connected at the location where more connecting parts 3202 are located, thereby improving the connection reliability of the outer insulating member 34 and the first inner insulating member 3311, and further improving the installation reliability of the outer insulating member 34.

[0131] Please refer again Fig.10 and Fig.11 In some embodiments, the clamping structure 32 further includes a main body portion 321 , the clamping member 322 is disposed on the main body portion 321 , and the main body portion 321 is connected to the first shell wall 13 .

[0132] Specifically, the first clamping portion 3221 and the second clamping portion 3222 are arranged on the body portion 321. For example, the body portion 321 can be an annular structure, and the body portion 321 is arranged around the clamping member 322. More specifically, the first clamping portion 3221 and the second clamping portion 3222 can both be annular structures, and the second clamping portion 3222 is located on the inner side of the body portion 321. The first clamping portion 3221 is located on the side of the second clamping portion 3222 away from the electrode component 2 and is connected to the body portion 321.

[0133] Therefore, the structure of the main body 321 is simple. By providing the main body 321 , the main body 321 can be disposed between the clamping member 322 and the first shell wall 13 , so that the clamping member 322 is fixed on the first shell wall 13 .

[0134] Please refer to Figure 15-17 , Fig.15 A top view of a pole component 3 of a battery cell 10 on a first shell wall 13 according to some embodiments of the present application; Fig.16 For along Fig.15 The structural cross-sectional view of the line B2-B2 shown in FIG. Fig.17 For along Fig.15 In some embodiments, the main body 321 and the clamping member 322 are integrally provided. The structure of the clamping structure 32 is simple, and the main body 321 and the clamping member 322 can be integrally provided, which not only saves the connection step between the two, which is beneficial to improving production efficiency, but also improves the structural strength of the clamping structure 32, which is beneficial to improving the reliability of the clamping structure 32.

[0135] Please refer again Fig.15 and Fig.16 In some embodiments, the body 321, the clamping member 322 and the first shell wall 13 are integrally arranged. That is, the body 321 and the clamping member 322 of the clamping structure 32 are integrally arranged, and the clamping structure 32 and the first shell wall 13 are integrally arranged. By integrally arranging the body 321, the clamping member 322 and the first shell wall 13, the connection step of the three can be omitted, which is conducive to improving production efficiency, and can also improve the structural strength of the first shell wall 13 and the clamping structure 32, which is conducive to improving the reliability of the first shell wall 13 and the clamping structure 32.

[0136] Please refer again Figure 4 and Figure 6In other embodiments, the body 321 is connected to the first shell wall 13 by welding. That is, the body 321 and the first shell wall 13 are separately provided, so that the shape and material of the clamping structure 32 and the first shell wall 13 can be independently designed to meet the differentiated design under different working conditions. For example, the body 321 and the first shell wall 13 can be connected by laser welding, autogenous welding or brazing.

[0137] Specifically, the clamping structure 32, the pole body 31, the first inner insulating member 3311 and the outer insulating member 34 can be assembled to form the pole component 3, and then the assembled pole component 3 can be installed on the first shell wall 13, and the main body 321 of the clamping structure 32 can be welded to the first shell wall 13.

[0138] In the above technical solution, by welding the main body 321 to the first shell wall 13, the assembly steps of the clamping structure 32, the pole body 31, the first inner insulating member 3311, the outer insulating member 34 and the first shell wall 13 can be simplified, which is conducive to improving production efficiency.

[0139] Please refer again Fig.16 and Fig.17 In some embodiments, the thickness of the body 321 is different from that of the first shell wall 13. Specifically, the thickness of the first shell wall 13 is h1, and the thickness of the body 321 of the clamping structure 32 is K3. K3 is different from h1 and can be flexibly selected according to needs.

[0140] For example, the thickness h1 of the first shell wall 13 may be greater than the thickness K3 of the main body 321 of the clamping structure 32. In this way, the structural strength of the first shell wall 13 can be improved, so that the first shell wall 13 is not easily deformed, and on the one hand, the support reliability of the first shell wall 13 on the pole component 3 can be improved, and on the other hand, the strength of the connection position between the first shell wall 13 and the main body 321 can be improved, and the reliability of the pole component 3 on the first shell wall 13 can be improved, so that the reliability of the battery cell 10 is higher.

[0141] For example, the thickness h1 of the first shell wall 13 can be reduced, and the thickness K3 of the main body 321 of the clamping structure 32 can be increased, so that the thickness h1 of the first shell wall 13 is less than the thickness K3 of the main body 321 of the clamping structure 32. By reducing the thickness h1 of the first shell wall 13, on the one hand, the cost of the first shell wall 13 can be reduced, and on the other hand, since the thickness K3 of the main body 321 of the clamping structure 32 is increased, the structural strength of the clamping structure 32 can be improved, the pressure resistance of the pole component 3 can be improved, and thus the reliability of the pole component 3 can be improved. The strength of the connection position between the main body 321 and the first shell wall 13 can also be improved, and the reliability of the pole component 3 on the first shell wall 13 can be improved, so that the reliability of the battery cell 10 is higher.

[0142] In some embodiments, the first clamping portion 3221 and the second clamping portion 3222 are not of equal thickness. Specifically, the first clamping portion 3221 of the clamping structure 32 has a thickness of K1, and the second clamping portion 3222 of the clamping structure 32 has a thickness of K2. K1 and K2 are not equal and can be flexibly selected according to needs.

[0143] For example, the thickness K1 of the first clamping portion 3221 of the clamping structure 32 can be greater than the thickness K2 of the second clamping portion 3222 of the clamping structure 32, which can improve the structural strength of the first clamping portion 3221, enable the first clamping portion 3221 to press the first inner insulating member 3311, and enable the first inner insulating member 3311 to meet the insulation requirements, thereby improving the insulation performance and reliability of the pole component 3.

[0144] For example, the thickness K2 of the second clamping portion 3222 of the clamping structure 32 can be greater than the thickness K1 of the first clamping portion 3221 of the clamping structure 32, which can improve the structural strength of the second clamping portion 3222, thereby improving the supporting strength of the second clamping portion 3222 to the pole body 31, making the reliability of the battery cell 10 higher.

[0145] In some embodiments, at least one of the first clamping portion 3221 and the second clamping portion 3222 is not equal in thickness to the body portion 321. Specifically, the thickness of the first clamping portion 3221 of the clamping structure 32 is K1, the thickness of the second clamping portion 3222 of the clamping structure 32 is K2, and the thickness of the body portion 321 of the clamping structure 32 is K3, K1 and K3 are not equal, and / or K2 and K3 are not equal, and can be flexibly selected according to needs.

[0146] For example, the thickness K3 of the main body 321 of the clamping structure 32 is greater than the thickness K1 of the first clamping part 3221 and the thickness K2 of the second clamping part 3222. Specifically, the preparation process of the clamping structure 32 can be roughly as follows: the inner side of the annular material of the clamping structure 32 is punched to form an annular structure with a roughly L-shaped cross section, and then the inner side of the annular structure is punched again to reduce the thickness of the inner side of the annular structure to form an annular structure with a roughly T-shaped cross section, that is, the main body 321, the second clamping part 3222 and the first clamping part 3221 before bending are formed, and the thickness K1 of the first clamping part 3221 and the thickness K2 of the second clamping part 3222 formed by punching are both smaller than the thickness K3 of the main body 321.

[0147] The thickness K3 of the main body 321 of the clamping structure 32 is greater than the thickness K1 of the first clamping portion 3221 and the thickness K2 of the second clamping portion 3222, which can improve the strength of the connection position between the main body 321 and the first shell wall 13, improve the reliability of the pole component 3 on the first shell wall 13, and make the reliability of the battery cell 10 higher.

[0148] For example, the thickness K2 of the second clamping portion 3222 of the clamping structure 32 is greater than the thickness K1 of the first clamping portion 3221 and the thickness K3 of the main body portion 321. Specifically, the preparation process of the clamping structure 32 can be roughly as follows: the outer side of the annular incoming material of the clamping structure 32 is punched to form an annular structure with a roughly L-shaped cross section, and then the outer side of the annular structure is punched again to reduce the thickness of the outer side of the annular structure to form an annular structure with a roughly T-shaped cross section, that is, the main body portion 321, the second clamping portion 3222 and the first clamping portion 3221 before bending are formed, and the thickness K3 of the main body portion 321 formed by punching and the thickness K1 of the first clamping portion 3221 are both smaller than the thickness K2 of the second clamping portion 3222.

[0149] The thickness K2 of the second clamping portion 3222 of the clamping structure 32 is greater than the thickness K1 of the first clamping portion 3221 and the thickness K3 of the main body 321 , which can improve the structural strength of the second clamping portion 3222 , thereby improving the supporting strength of the second clamping portion 3222 on the pole body 31 , making the reliability of the battery cell 10 higher.

[0150] In some embodiments, at least one of the first clamping portion 3221 and the second clamping portion 3222 is not equal to the first shell wall 13. Specifically, the thickness of the first clamping portion 3221 of the clamping structure 32 is K1, the thickness of the second clamping portion 3222 of the clamping structure 32 is K2, and the thickness of the first shell wall 13 is h1, K1 and h1 are not equal; and / or, K2 and h1 are not equal, which can be flexibly selected according to needs.

[0151] For example, the thickness h1 of the first shell wall 13 is greater than the thickness K1 of the first clamping portion 3221 and the thickness K2 of the second clamping portion 3222. The first shell wall 13 has a higher structural strength, which is conducive to improving the support reliability of the first shell wall 13 for the pole component 3 and improving the insulation performance and reliability of the pole component 3.

[0152] For example, the thickness K1 of the first clamping portion 3221 is greater than the thickness h1 of the first shell wall 13, and the thickness K2 of the second clamping portion 3222 is less than the thickness h1 of the first shell wall 13. For example, the thickness K1 of the first clamping portion 3221 is less than the thickness h1 of the first shell wall 13, and the thickness K2 of the second clamping portion 3222 is greater than the thickness h1 of the first shell wall 13.

[0153] In summary, in the above technical solution, the insulation performance and reliability of the pole component 3 can be improved as needed by adjusting the thickness of the first shell wall 13, the thickness of the first clamping part 3221 of the clamping structure 32, the thickness of the second clamping part 3222 and the thickness of the main body 321.

[0154] Please refer again Fig.10and Fig.11 In some embodiments, the surface of the outer insulating member 34 facing away from the first clamping portion 3221 is smoothly connected to the end surface of the pole body 31 facing away from the electrode component 2. In other words, the surface of the pole component 3 facing away from the electrode component 2 is relatively flat.

[0155] Such arrangement can simplify the external structure of the battery cell 10 and make the appearance of the battery cell 10 beautiful, and can also reduce the stopping effect of the external insulating member 34 on the busbar component and improve the connection reliability between the pole body 31 and the busbar component.

[0156] Please refer again Fig.11 In some embodiments, a peripheral edge of an end surface of the pole body 31 facing away from the electrode component 2 has a step 311 , and the outer insulating member 34 at least partially extends to the step 311 .

[0157] For example, the step 311 may be an annular structure, and correspondingly, the end of the outer insulating member 34 away from the second clamping portion 3222 has an annular matching portion, and the annular matching portion is located at the step 311. For example, the step 311 may be an intermittent step surrounding the circumference of the pole body 31, and correspondingly, the end of the outer insulating member 34 away from the second clamping portion 3222 has an intermittent matching portion surrounding the circumference of the pole body 31 to match the intermittent step.

[0158] Furthermore, the surface of the portion of the outer insulating member 34 extending onto the step 311 which faces away from the step 311 is flush with the end surface of the pole body 31 which faces away from the electrode component 2 , so as to improve the connection reliability between the pole body 31 and the busbar component.

[0159] In the above technical solution, by setting a step 311 on the pole body 31, the contact area between the outer insulating member 34 and the pole body 31 can be increased, thereby increasing the connection reliability between the outer insulating member 34 and the pole body 31, making the insulation reliability between the busbar component and the clamping structure 32 higher, and the outer insulating member 34 is connected to the first inner insulating member 3311, which can completely separate the pole body 31 and the clamping structure 32, so that the insulation reliability between the pole body 31 and the clamping structure 32 is higher.

[0160] In some embodiments, the step 311 is an annular structure, and the outer insulating member 34 is arranged around the first clamping portion 3221. By setting the step 311 as an annular structure, the contact area between the outer insulating member 34 and the pole body 31 can be further increased, thereby increasing the connection reliability between the outer insulating member 34 and the pole body 31, and making the insulation reliability between the busbar component and the clamping structure 32 higher.

[0161] Please refer again Fig.11In some embodiments, the first clamping portion 3221 includes a first extension section 32211, a second extension section 32212 and an arc extension section 32213, the first extension section 32211 is arranged on the circumferential side of the pole body 31, and the first extension section 32211 is connected to the second clamping portion 3222, the second extension section 32212 is located on the side of the pole body 31 away from the electrode component 2, and the second extension section 32212 and the second clamping portion 3222 are arranged relatively spaced apart, and the first extension section 32211 and the second extension section 32212 are connected through the arc extension section 32213.

[0162] The outer insulating member 34 includes a first insulating segment 341, a second insulating segment 342 and an arc insulating segment 343. The first insulating segment 341 covers the side of the first extension segment 32211 away from the pole body 31, the second insulating segment 342 covers the side of the second extension segment 32212 away from the pole body 31, and the first insulating segment 341 and the second insulating segment 342 are connected by the arc insulating segment 343.

[0163] In the above technical solution, by setting the first clamping portion 3221 to include a first extension segment 32211, a second extension segment 32212 and an arc extension segment 32213, and setting the outer insulating member 34 to include a first insulating segment 341, a second insulating segment 342 and an arc insulating segment 343, the damage of the pole body 31 to the outer insulating member 34 is reduced, thereby improving the insulation reliability of the outer insulating member 34.

[0164] Please refer again Fig.12 In some embodiments, there are multiple second extension segments 32212 , and the multiple second extension segments 32212 are arranged at intervals in the circumferential direction of the pole body 31 , and two adjacent second extension segments 32212 define at least a portion of the connecting portion 3202 .

[0165] For example, when the pole body 31, the clamping structure 32, and the first inner insulating member 3311 are assembled, the pole body 31, the first inner insulating member 3311, and the clamping structure 32 can be firstly arranged from the inside to the outside, and then the first clamping portion 3221 of the clamping structure 32 is bent relative to the first clamping portion 3221, so that a part of the first clamping portion 3221 is bent toward the pole body 31, and the first inner insulating member 3311 is pressed, so that the pole body 31 is fixed on the clamping structure 32, and the first inner insulating member 3311 is clamped between the pole body 31 and the clamping structure 32, thereby improving the insulation reliability of the first inner insulating member 3311.

[0166] In the above technical solution, by setting the first clamping portion 3221 to include multiple second extension portions and defining a connecting portion 3202 between two adjacent second extension portions, on the one hand, problems such as material stacking and wrinkles in the first clamping portion 3221 during the bending process can be reduced, which is conducive to bending the first clamping portion 3221 relative to the second clamping portion 3222, thereby fixing the pole body 31 on the clamping structure 32; on the other hand, the bent first clamping portion 3221 can compress the first inner insulating member 3311, so that the insulation between the pole body 31 and the first clamping portion 3221 is more reliable.

[0167] Please refer again Fig.10 and Fig.11 In some embodiments, the side surface of the second insulating section 342 facing away from the second extension section 32212 is in the same plane as the end surface of the pole body 31 facing away from the electrode component 2. In other words, the side surface of the second insulating section 342 facing away from the second extension section 32212 is in the same height position as the end surface of the pole body 31 facing away from the electrode component 2, and there is no height difference between the two.

[0168] When the pole component 3 of the battery cell 10 is connected to the busbar component, the external insulating member 34 will not affect the connection reliability between the pole body 31 and the busbar component while satisfying the insulation effect, which is beneficial to improving the reliability of the battery cell 10 .

[0169] Therefore, such a configuration can make the end surface of the pole component 3 away from the electrode component 2 relatively flat, which can reduce the interference of the pole component 3 with other components outside the shell component 1 (such as the busbar component, etc.), and improve the reliability of the battery cell 10.

[0170] In other embodiments, the pole body 31 at least partially protrudes from the surface of the second insulating section 342 on one side away from the pole body 31. When the pole component 3 of the battery cell 10 is connected to the busbar component, the external insulating member 34 will not affect the connection reliability between the pole body 31 and the busbar component on the basis of satisfying the insulation effect, and can also reduce the interference of the pole component 3 with other components outside the housing component 1 (such as the busbar component, etc.), which is conducive to improving the reliability of the battery cell 10.

[0171] Please refer again Fig.10 , Fig.11 and Fig.17In some embodiments, the peripheral side of the pole body 31 has a flange portion 312, and in the thickness direction of the first shell wall 13, the flange portion 312 is located between the first clamping portion 3221 and the second clamping portion 3222. The flange portion 312 may be a structure located at the periphery of the pole body 31. For example, the flange portion 312 may be an annular structure located at the periphery of the pole body 31; for another example, the flange portion 312 may be a plurality of discontinuous structures located at the periphery of the pole body 31.

[0172] Specifically, the side of the flange portion 312 facing away from the electrode component 2 is the outer side of the flange portion 312, and the side of the flange portion 312 close to the electrode component 2 is the inner side of the flange portion 312. In the thickness direction of the first shell wall 13, the first clamping portion 3221 can be at least partially arranged opposite to the outer side of the flange portion 312, and the second clamping portion 3222 can be arranged opposite to the inner side of the flange portion 312, so that the flange portion 312 is located between the first clamping portion 3221 and the second clamping portion 3222, thereby realizing the fixed installation of the pole body 31 on the clamping structure 32.

[0173] Among them, the first inner insulator 3311 is located between the first clamping portion 3221 and the flange portion 312. The first inner insulator 3311 can extend along the circumference of the flange portion 312. The relative position of the first inner insulator 3311 and the flange portion 312 is not limited. For example, the first inner insulator 3311 is at least partially clamped between the outer side of the flange portion 312 (the side of the flange portion 312 facing away from the electrode component 2) and the first clamping portion 3221; or, the first inner insulator 3311 is at least partially clamped between the radial outer side of the flange portion 312 and the first clamping portion 3221; or, at least a part of the first inner insulator 3311 is clamped between the flange portion 312 and the first clamping portion 3221 and at least another part is clamped between the inner side of the flange portion 312 (the side of the flange portion 312 close to the electrode component 2) and the second clamping portion 3222.

[0174] In the above technical solution, by arranging the flange portion 312 on the circumferential side of the pole body 31, the first clamping portion 3221 and the second clamping portion 3222 are respectively located on both sides of the flange portion 312 in the thickness direction of the first shell wall 13, so as to limit the pole body 31 from moving relative to the clamping structure 32 in the direction away from or close to the electrode component 2. The structure of the flange portion 312 is simple and easy to process. By clamping the first inner insulating member 3311 between the first clamping portion 3221 and the flange portion 312, it is beneficial to insulate the matching position of the clamping structure 32 and the pole body 31 in a shorter path, thereby improving the reliability of insulation, and it is beneficial to reduce the size of the first inner insulating member 3311, making it easy to clamp it, so that the insulation performance is not easy to fail, and the insulation effect is improved.

[0175] Please refer again Fig.17 , and further refer to Fig.18 , Fig.18 Schematic diagram of the structure of the pole component of the battery cell in other embodiments of the present application. In some embodiments, the pole component 3 further includes a sealing ring 332, which is arranged between the second clamping portion 3222 and the flange portion 312. The sealing ring 332 can be made of a material that has both sealing and insulating properties, such as an elastic rubber part, so that the required sealing requirements can be met by designing the shape and position of the sealing ring 332.

[0176] In the above technical solution, by arranging a sealing ring 332 between the second clamping portion 3222 and the flange portion 312, sealing between the pole body 31 and the clamping structure 32 can be achieved, so that the pole component 3 itself has self-sealing properties, which facilitates the installation and coordination of the pole component 3 and the first shell wall 13, and can save installation time and cost.

[0177] Exemplarily, the pole component 3 can be tested for air tightness when it is received or when the pole component 3 is processed to determine whether a reliable seal is formed at the connection position between the clamping structure 32 and the pole body 31. If the seal is reliable, the pole component 3 can be connected to the first shell wall 13.

[0178] Please refer to Fig.19 , Fig.19 The schematic diagram of the structure of the pole component of the battery cell of some other embodiments of the present application is shown in FIG.

[0179] For example, the sealing ring 332 can be partially clamped between the first clamping portion 3221 and the side of the flange portion 312 facing away from the electrode component 2, partially clamped between the first clamping portion 3221 and the radial outer side of the flange portion 312, and another partially clamped between the second clamping portion 3222 and the side of the flange portion 312 close to the electrode component 2.

[0180] Specifically, Fig.19As shown, the sealing ring 332 may include a first sealing portion 3321, a second sealing portion 3322 and a third sealing portion 3323 connected to each other, the second sealing portion 3322 is connected between the first sealing portion 3321 and the third sealing portion 3323, the first sealing portion 3321 is clamped between the second clamping portion 3222 and the side of the flange portion 312 close to the electrode component 2, the second sealing portion 3322 is clamped between the first clamping portion 3221 and the radial outer side of the flange portion 312, and the third sealing portion 3323 is clamped between the first clamping portion 3221 and the side of the flange portion 312 away from the electrode component 2. In other words, under the action of the clamping member 322, the sealing ring 332 clamps the side of the flange portion 312 away from the electrode component 2 and the side of the flange portion 312 close to the electrode component 2, thereby increasing the compression amount of the sealing ring 332 and improving reliability.

[0181] In the above technical solution, by simultaneously arranging the integrally arranged sealing ring 332 between the first clamping portion 3221 and the flange portion 312, and between the second clamping portion 3222 and the flange portion 312, multi-directional and multi-positional sealing cooperation can be achieved, thereby reducing sealing failure and helping to improve the sealing effect of the sealing ring 332, thereby meeting the required sealing requirements.

[0182] Please refer again Fig. 20 , Fig. 20 Schematic diagram of the structure of the pole component of the battery cell of other embodiments of the present application. In some embodiments, the pole component 3 further includes a sealing ring 332 and a second inner insulating member 3312, the sealing ring 332 is arranged between the connection position of the first clamping portion 3221 and the second clamping portion 3222 and the flange portion 312, and the second inner insulating member 3312 is arranged between the position of the second clamping portion 3222 away from the first clamping portion 3221 and the flange portion 312. The shape of the sealing ring 332 can be adapted to the connection position of the first clamping portion 3221 and the second clamping portion 3222.

[0183] For example, the first clamping portion 3221 and the second clamping portion 3222 are arranged at an angle, and the sealing ring 332 may include a first sealing portion 3321 and a second sealing portion 3322 that are connected. Correspondingly, the first sealing portion 3321 and the second sealing portion 3322 are arranged at an angle, the first sealing portion 3321 is clamped between the second clamping portion 3222 and a side of the flange portion 312 close to the electrode component 2, and the second sealing portion 3322 is clamped between the first clamping portion 3221 and the radial outer side of the flange portion 312, so that the sealing ring 332 is at least partially located between the connection position of the first clamping portion 3221 and the second clamping portion 3222 and the flange portion 312.

[0184] Since one end of the second clamping portion 3222 is connected to the first clamping portion 3221, the other end of the second clamping portion 3222 (the end of the second clamping portion 3222 away from the first clamping portion 3221) is a free end, that is, the second clamping portion 3222 can be regarded as a cantilever structure. Therefore, when the pole body 31 is compressed or pulled, the second clamping portion 3222 may be deformed relative to the first shell wall 13, and the end of the second clamping portion 3222 connected to the first clamping portion 3221 (the fixed end of the second clamping portion 3222) is deformed the most, or even remains unchanged, and the end of the second clamping portion 3222 away from the first clamping portion 3221 (the free end) is deformed the most. If the sealing ring 332 is set between the end of the second clamping portion 3222 away from the first clamping portion 3221 and the flange portion 312, the sealing effect of the sealing ring 332 may be affected.

[0185] Therefore, by arranging the sealing ring 332 between the connection position of the first clamping portion 3221 and the second clamping portion 3222 and the flange portion 312, that is, equivalent to arranging the sealing ring 332 between the position of the second clamping portion 3222 close to its fixed end and the flange portion 312, the influence of the deformation of the second clamping portion 3222 when the pole body 31 is compressed or pulled on the sealing effect of the sealing ring 332 can be reduced, the sealing failure can be reduced, the problem of insufficient compression of the sealing ring 332 can be solved, and the sealing ring 332 can meet the required sealing requirements.

[0186] The second inner insulating member 3312 is arranged between the position of the second clamping portion 3222 away from the first clamping portion 3221 and the flange portion 312, which can achieve insulation between the pole body 31 and the second clamping portion 3222, further improve the self-insulation of the pole component 3 itself, facilitate the installation and coordination of the pole component 3 and the first shell wall 13, and save installation time and cost.

[0187] For example, after the pole body 31, the clamping structure 32, the sealing ring 332 and the first inner insulating member 3311 are assembled, the assembly can be placed in a mold, and then a melt for forming the second inner insulating member 3312 is injected into the mold, and the melt can fill the space between the second clamping portion 3222 away from the first clamping portion 3221 and the flange portion 312. After the melt solidifies, the second inner insulating member 3312 is formed, and the second inner insulating member 3312 is connected to the sealing ring 332. For example, the second inner insulating member 3312 can also be a preformed structure, that is, the pole body 31, the clamping structure 32, the sealing ring 332, the first inner insulating member 3311 and the second inner insulating member 3312 can be directly assembled together.

[0188] Therefore, in the above technical solution, by adopting the sealing ring 332 and the second inner insulating member 3312, and cooperating with the first inner insulating member 3311, and by reasonably arranging the sealing ring 332, the first inner insulating member 3311 and the second inner insulating member 3312 between the pole body 31 and the clamping structure 32, it is possible to reduce insulation and sealing failures, and better improve the insulation and sealing effect between the pole body 31 and the clamping structure 32, thereby improving the reliability of the battery cell 10.

[0189] Please refer again Figure 17-Figure 19 In some embodiments, the end face of the pole body 31 facing the electrode component 2 is flush with the surface of the first shell wall 13 facing the electrode component 2. Here, the end face and the surface are "flush" means that the end face and the surface are at the same height position, and there is no height difference between the two, that is, the end face of the pole body 31 facing the electrode component 2 and the surface of the first shell wall 13 facing the electrode component 2 are in the same plane.

[0190] In the above technical solution, by making the end surface of the pole body 31 facing the electrode component 2 flush with the surface of the first shell wall 13 facing the electrode component 2, the assembly of the first shell wall 13 and the pole component 3 is relatively flat towards the electrode component 2, which can reduce the interference of the pole component 3 with other components in the shell component 1 and simplify the structure of other components in the shell component 1.

[0191] Please refer again Fig. 20 In other embodiments, an end surface of the pole body 31 facing the electrode component 2 is located on a side of the first shell wall 13 facing the electrode component 2 and away from the electrode component 2 .

[0192] That is, the distance between the end face of the pole body 31 facing the electrode component 2 and one end of the active material coating portion 21 of the electrode component 2 is greater than the distance between the side surface of the first shell wall 13 facing the electrode component 2 and one end of the active material coating portion 21 of the electrode component 2, so that the assembly of the first shell wall 13 and the pole component 3 is formed with a receiving groove 301 on the side facing the electrode component 2, and the receiving groove 301 is open in the direction of the electrode component 2, and the receiving groove 301 can be used to receive at least a part of the conductive portion 22 of the electrode component 2. Among them, the configuration of the receiving groove 301 is not limited, and it can be flexibly designed and constructed.

[0193] With such a configuration, a receiving groove 301 can be defined, and at least a portion of the conductive portion 22 of the electrode component 2 can be received in the receiving groove 301, which can reduce the space occupied by the conductive portion 22 in the receiving cavity, so that the receiving cavity has a larger space to receive the active material coating portion 21, which is beneficial to increase the volume of the active material coating portion 21, thereby increasing the energy density of the battery cell 10. Moreover, since the receiving groove 301 is open toward the direction of the electrode component 2, the conductive portion 22 can be easily inserted into the receiving groove 301, reducing the difficulty of operation.

[0194] Please refer again Fig.18 The pole body 31 also includes an insulating bracket 6, which is arranged on the side of the clamping structure 32 close to the electrode component 2. The pole body 31 includes a pole inner protrusion 313, which is located in the inner ring area of ​​the insulating bracket 6. The pole inner protrusion 313 protrudes relative to the clamping structure 32 toward the inner side of the first shell wall 13.

[0195] Among them, one side surface of the inner protrusion 313 of the pole close to the electrode component 2 is flush with the one side surface of the insulating bracket 6 close to the electrode component 2, that is, the one side surface of the inner protrusion 313 of the pole close to the electrode component 2 and the one side surface of the insulating bracket 6 close to the electrode component 2 are in the same plane.

[0196] Of course, the side surface of the inner protrusion 313 of the pole close to the electrode component 2 can also be located on the side of the side surface of the insulating bracket 6 close to the electrode component 2 that is away from the electrode component 2, that is, the distance between the inner protrusion 313 of the pole and one end of the active material coating part 21 is greater than the distance between the insulating bracket 6 and one end of the active material coating part 21, so that the inner ring area of ​​the insulating bracket 6 can accommodate at least part of the conductive part 22 of the electrode component 2.

[0197] In the above technical solution, by providing the insulating bracket 6, insulation can be achieved between the active material coating portion 21 of the electrode component 2 and the clamping structure 32, and insulation can also be achieved between the active material coating portion 21 of the electrode component 2 and the first shell wall 13, which is beneficial to improving the reliability of the battery cell 10.

[0198] Please refer again Figure 4 and Figure 6 The structure of the shell component 1 is not limited. For example, the shell component 1 includes a shell body 11 that forms a receiving cavity, one end of the shell body 11 has an opening 110, and the end of the shell body 11 opposite to the opening 110 is a first shell wall 13. For another example, in combination Figure 4 The housing component 1 includes a housing cover 12 that forms a receiving cavity, and the housing cover 12 is a first housing wall 13. Therefore, the structural design of the housing component 1 is flexible, and the arrangement position of the pole component 3 is flexible.

[0199] Please refer again Figure 3 , Figure 4 and Figure 6 In some embodiments, the battery cell 10 further includes a pressure relief device 4, which is disposed on the housing component 1. For example, the pressure relief device 4 may be an explosion-proof valve mounted on the housing component 1, or may be integrally formed in a thinned area of ​​the housing component 1. Thus, by providing the pressure relief device 4, when the pressure in the housing component 1 exceeds a preset value, the pressure may be directionally relieved through the pressure relief device 4, thereby improving the safety and reliability of the battery cell 10.

[0200] For example, the pressure relief device 4 is located on the same side as the pole component 3. Since the pole component 3 is arranged on the first shell wall 13, when the pressure relief device 4 is also arranged on the first shell wall 13, the pressure relief device 4 and the pole component 3 are located on the same side, for example, both are arranged on the top of the battery cell 10, or both are arranged on the bottom of the battery cell 10, or both are arranged on the same side wall of the battery cell 10, etc. In this way, the design of other shell walls other than the first shell wall 13 can be simplified, and the structure and processing of the battery cell 10 can be simplified. Among them, the shell component 1 can be surrounded by a plurality of non-coplanar walls, for example, a rectangular shell component 1 is surrounded by six walls, one of which is the first shell wall 13. The pressure relief device 4 and the pole component 3 are arranged on the same wall, and the two are located on the same side.

[0201] For example, the pressure relief device 4 and the pole component 3 are located on opposite sides. Since the pole component 3 is arranged on the first shell wall 13, when the pressure relief device 4 is arranged on other walls of the shell component 1 except the first shell wall 13, for example, the end of the shell body 11 opposite to the opening 110 is the second shell wall 14, and the pressure relief device 4 is arranged on the second shell wall 14, then the pressure relief device 4 and the pole component 3 are located on opposite sides. Therefore, there is no need to consider that the pressure relief device 4 occupies the space of the first shell wall 13 and reduces the level of the pole component 3, so that the shape and area of ​​the pole component 3 can be flexibly designed as needed. Among them, the shell component 1 can be surrounded by a plurality of non-coplanar walls, for example, a rectangular shell component 1 is surrounded by six walls, one of which is the first shell wall 13, and the pressure relief device 4 is arranged on any other wall except the first shell wall 13, and the pole component 3 is arranged on the first shell wall 13, then the two are located on opposite sides.

[0202] Please refer again Figure 4 and Figure 6 The battery cell 10 also includes an insulating film 5, which can wrap the active material coating part 21 to improve the insulation reliability between the active material coating part 21 and the shell part 1, reduce or prevent the active material coating part 21 from contacting with the shell part 1 and causing the shell part 1 to be corroded, reduce the leakage of electrolyte caused by corrosion of the shell part 1, and improve the reliability of the battery cell 10.

[0203] According to some embodiments of the present application, the present application provides a battery cell 10 , including a shell component 1 , an electrode component 2 , a pole component 3 , a pressure relief device 4 , an insulating film 5 and an insulating bracket 6 .

[0204] The shell component 1 includes a shell body 11 and a shell cover 12. The shell cover 12 or the wall of the shell body 11 opposite to the shell cover 12 can be a first shell wall 13. The electrode component 2 is arranged in the shell component 1. The pole component 3 is arranged on the first shell wall 13 and connected to the conductive part 22 of the electrode component 2.

[0205] The pole component 3 includes a pole body 31 , a clamping structure 32 , an insulating sealing structure 33 and an outer insulating member 34 . The outer periphery of the pole body 31 has a flange portion 312 .

[0206] The clamping structure 32 includes a connected main body portion 321 and a clamping member 322, the main body portion 321 is connected to the first shell wall 13, the clamping member 322 includes a connected first clamping portion 3221 and a second clamping portion 3222, the first clamping portion 3221 is located on the side of the second clamping portion 3222 away from the electrode component 2, a clamping groove 3201 is defined between the first clamping portion 3221 and the second clamping portion 3222, the clamping groove 3201 is used to clamp the flange portion 312, the insulating sealing structure 33 is arranged between the flange portion 312 and the clamping member 322, the external insulating member 34 covers the side of the first clamping portion 3221 away from the clamping groove 3201, and is connected to the insulating sealing structure 33.

[0207] The insulating sealing structure 33 includes an inner insulator 331 and a sealing ring 332. The inner insulator 331 may include a first inner insulator 3311, or include a first inner insulator 3311 and a second inner insulator 3312.

[0208] For example, Fig.17 As shown, the insulating sealing structure 33 may include a first inner insulating member 3311 and a sealing ring 332. The first inner insulating member 3311 may be arranged between the clamping member 322 and the flange portion 312. One end of the first inner insulating member 3311 extends to between an end of the first clamping portion 3221 away from the second clamping portion 3222 and the pole body 31, and the other end extends to between the second clamping portion 3222 and the flange portion 312. The sealing ring 332 is clamped between an end of the second clamping portion 3222 away from the first clamping portion 3221 and the pole body 31.

[0209] For example, Fig.18As shown, the insulating sealing structure 33 may include a first inner insulating member 3311 and a sealing ring 332. The first inner insulating member 3311 may be arranged between the clamping member 322 and the pole body 31, and one end of the first inner insulating member 3311 extends to between one end of the first clamping portion 3221 away from the second clamping portion 3222 and the pole body 31, and the other end extends to the radial outside of the flange portion 312. The sealing ring 332 is arranged between the second clamping portion 3222 and the flange portion 312, one end of the sealing ring 332 extends to the connection position of the first clamping portion 3221 and the second clamping portion 3222 or the radial outside of the flange portion 312, and the other end extends to between one end of the second clamping portion 3222 away from the first clamping portion 3221 and the pole body 31.

[0210] For example, Fig.19 As shown, the insulating sealing structure 33 may include a first inner insulating member 3311, a sealing ring 332 and a second inner insulating member 3312, the first inner insulating member 3311 is arranged between the end of the first clamping portion 3221 away from the second clamping portion 3222 and the pole body 31, a part of the sealing ring 332 is clamped between the first clamping portion 3221 and the radial outer side of the flange portion 312, a part is clamped between the first clamping portion 3221 and the side of the flange portion 312 away from the electrode component 2, and the other part is clamped between the second clamping portion 3222 and the side of the flange portion 312 toward the electrode component 2, and the second inner insulating member 3312 is clamped between the end of the second clamping portion 3222 away from the first clamping portion 3221 and the pole body 31.

[0211] For example, Fig. 20 As shown, the insulating sealing structure 33 may include a first inner insulating member 3311, a sealing ring 332 and a second inner insulating member 3312, a portion of the first inner insulating member 3311 is arranged between the first clamping portion 3221 and the side of the flange portion 312 away from the electrode component 2, and the other portion is arranged between the end of the first clamping portion 3221 away from the second clamping portion 3222 and the pole body 31, a portion of the sealing ring 332 is clamped between the first clamping portion 3221 and the radial outer side of the flange portion 312, and a portion is clamped between the second clamping portion 3222 and the side of the flange portion 312 facing the electrode component 2, and the second inner insulating member 3312 is at least partially clamped between the end of the second clamping portion 3222 away from the first clamping portion 3221 and the pole body 31.

[0212] According to some embodiments of the present application, the present application further provides a battery device 100, which includes the battery cell 10 described in the above scheme. It is worth noting that the battery device 100 according to the embodiment of the present application may include a box body 1012, or may not include the box body 1012. Therefore, since the reliability of the battery cell 10 according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery device 100.

[0213] Exemplarily, the battery device 100 may further include a busbar component, and the battery cells 10 are multiple and at least two are electrically connected through the busbar component. Thus, multiple battery cells 10 can be connected in series and / or in parallel. For example, when multiple battery cells 10 are connected in series, the pole component 3 of the negative electrode of one battery cell 10 is connected to the pole component 3 of the positive electrode of the next battery cell 10 through a busbar component, and at the same time, the pole component 3 of the positive electrode of the battery cell 10 is connected to the pole component 3 of the negative electrode of the previous battery cell 10 through another busbar component.

[0214] According to some embodiments of the present application, the present application further provides an electric device including the battery device 100 described in the above solution, and the battery device 100 is used to provide electric energy to the electric device. The electric device can be any of the above-mentioned devices or systems using the battery device 100. Since the performance of the battery device 100 is improved, it is beneficial to improve the working performance of the electric device.

[0215] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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, characterized in that: include: A shell component including a first shell wall; An electrode component, housed in the housing component; A pole component is arranged on the first shell wall, and comprises a pole body, a clamping structure, and a first inner insulating member and an outer insulating member which are arranged separately; the pole body is connected to the electrode component; the clamping structure is connected to the first shell wall, and has a clamping groove for clamping the pole body, the first inner insulating member is located in the clamping groove and between the inner wall of the clamping structure and the pole body, and the outer insulating member at least partially covers the outer wall of the clamping structure; Wherein, a connecting portion is provided on the clamping structure, and the first inner insulating component is connected to the outer insulating component via the connecting portion.

2. The battery cell according to claim 1, characterized in that: The clamping structure comprises a clamping member, wherein the clamping member comprises a first clamping portion and a second clamping portion connected to each other, wherein the first clamping portion and the second clamping portion together form the clamping groove; The first inner insulating member is at least partially disposed between the first clamping portion and the pole body; the outer insulating member is disposed on the first clamping portion to form an outer wall of the clamping groove; and the communicating portion is disposed on the first clamping portion.

3. The battery cell according to claim 2, characterized in that: The communication portion includes a notch, which is formed at the notch opening of the clamping groove and is located at an end of the first clamping portion away from the second clamping portion.

4. The battery cell according to claim 3, characterized in that: The first clamping portion is bent relative to the second clamping portion to form the clamping groove together with the second clamping portion; The notch extends from an end of the first clamping portion away from the second clamping portion to a bent position.

5. The battery cell according to claim 2, characterized in that: The communicating portion is a through hole with a hole wall closed on all sides, and the through hole is opened in the first clamping portion.

6. The battery cell according to claim 5, characterized in that: The first clamping portion is bent relative to the second clamping portion to form the clamping groove together with the second clamping portion, and the through hole avoids the bent position of the first clamping portion.

7. The battery cell according to claim 6, characterized in that: The first clamping portion is divided into zones according to the bending position of the first clamping portion, the zone close to the second clamping portion is the first zone, the zone far from the second clamping portion is the second zone, and the through hole is arranged in the first zone.

8. The battery cell according to claim 2, characterized in that: There are a plurality of the communication portions, and the plurality of the communication portions are arranged at intervals in a circumferential direction around the pole body on the first clamping portion.

9. The battery cell according to claim 2, characterized in that: The clamping structure is in a circular ring shape, and the connecting portion is arranged at any position of the first clamping portion in the circumferential direction around the pole body; Alternatively, the clamping structure is in the shape of an elongated strip and includes a straight line segment and an arc segment, and the connecting portion is at least provided at a junction position between the straight line segment and the arc segment.

10. The battery cell according to claim 2, characterized in that: The clamping structure further includes a main body portion, the first clamping portion and the second clamping portion are arranged on the main body portion, and the main body portion is connected to the first shell wall.

11. The battery cell according to claim 10, characterized in that: The main body and the clamping member are integrally provided; or the main body, the clamping member and the first shell wall are integrally provided.

12. The battery cell according to claim 10, characterized in that: The main body is connected to the first shell wall by welding.

13. The battery cell according to claim 10, characterized in that: The main body portion and the first shell wall are of different thicknesses; and / or, the first clamping portion and the second clamping portion are of different thicknesses; and / or, at least one of the first clamping portion and the second clamping portion is of different thicknesses than the main body portion; and / or, at least one of the first clamping portion and the second clamping portion is of different thicknesses than the first shell wall.

14. The battery cell according to claim 2, characterized in that: A side surface of the outer insulating member facing away from the first clamping portion is smoothly transitionally connected to an end surface of the pole body facing away from the electrode component.

15. The battery cell according to claim 2, characterized in that: The pole body has a step at its periphery on one end surface facing away from the electrode component, and the outer insulating member at least partially extends to the step.

16. The battery cell according to claim 15, characterized in that: The step is an annular structure, and the outer insulating member is disposed around the first clamping portion.

17. The battery cell according to claim 2, characterized in that: The first clamping portion comprises a first extension section, a second extension section and an arc extension section, the first extension section is arranged around the circumference of the pole body and connected to the second clamping portion, the second extension section is located on a side of the pole body away from the electrode component and is arranged opposite to the second clamping portion, and the first extension section and the second extension section are connected through the arc extension section; The outer insulating member includes a first insulating segment, a second insulating segment and an arc insulating segment, the first insulating segment covers a side of the first extension segment away from the pole body, the second insulating segment covers a side of the second extension segment away from the pole body, and the first insulating segment and the second insulating segment are connected via the arc insulating segment.

18. The battery cell according to claim 17, characterized in that: There are a plurality of the second extension segments, and the plurality of the second extension segments are arranged at intervals in the circumferential direction of the pole body, and two adjacent second extension segments define at least a portion of the connecting portion.

19. The battery cell according to claim 17, characterized in that: A side surface of the second insulating section facing away from the second extending section and an end surface of the pole body facing away from the electrode component are in the same plane.

20. The battery cell according to claim 2, characterized in that: The pole body has a flange portion on its circumferential side. In the thickness direction of the first shell wall, the flange portion is located between the first clamping portion and the second clamping portion. The first inner insulator is at least partially located between the first clamping portion and the flange portion.

21. The battery cell according to claim 20, characterized in that: The pole component further includes a sealing ring, which is arranged between the second clamping portion and the flange portion; Alternatively, the pole component further comprises an integrally arranged sealing ring, wherein the sealing ring is located between the first clamping portion and the flange portion, and between the second clamping portion and the flange portion; Alternatively, the pole component further includes a sealing ring and a second inner insulator, wherein the sealing ring is arranged between the connecting position of the first clamping portion and the second clamping portion and the flange portion, and the second inner insulator is arranged between the position of the second clamping portion away from the first clamping portion and the flange portion.

22. The battery cell according to claim 1, characterized in that: An end surface of the pole body facing the electrode component is flush with a side surface of the first shell wall facing the electrode component; Alternatively, an end surface of the pole body facing the electrode component is located on a side of a surface of the first shell wall facing the electrode component and away from the electrode component.

23. The battery cell according to claim 1, characterized in that: The pole body further includes an insulating support, the insulating support is arranged on a side of the clamping structure close to the electrode component, the pole body includes a pole inner convex portion located in the inner ring area of ​​the insulating support, and the pole inner convex portion protrudes relative to the clamping structure toward the inner side of the first shell wall; A surface of the inner convex portion of the pole close to the electrode component is flush with a surface of the insulating support close to the electrode component, or is located on a side of the surface of the insulating support close to the electrode component that is away from the electrode component.

24. The battery cell according to any one of claims 1 to 23, characterized in that: The shell component comprises a shell body having an opening at at least one end, and a shell cover arranged at the opening; Wherein, the wall of the shell body opposite to the opening is the first shell wall; or, the shell cover is the first shell wall.

25. The battery cell according to any one of claims 1 to 23, characterized in that: It also includes a pressure relief device, which is arranged on the shell component and is located on the same side or the opposite side as the pole component.

26. A battery device, characterized in that: Comprising a battery cell according to any one of claims 1-25.

27. An electrical device, characterized in that: Comprising a battery device according to claim 26.

Images