Battery cells, batteries and electrical devices

Abstract

The utility model relates to the field of batteries, and discloses a battery cell, a battery and an electrical device, wherein the battery cell comprises: a shell component, comprising a shell body, the opposite ends of the shell body respectively form an open end and a first shell wall, the first shell wall is provided with a mounting hole, at least one side of the shell body adjacent to the first shell wall is a second shell wall, a guide portion is provided between the second shell wall and the first shell wall, the guide portion comprises a guide surface located in the shell body, in the direction in which the open end points to the first shell wall, the distance between the guide surface and the inner wall surface of the second shell wall gradually increases; a pole component, mounted on the first shell wall and covered on the mounting hole, the pole component comprises a pole body arranged opposite to the mounting hole; an electric core component, received in the accommodating cavity of the shell body and connected to the pole body. When assembling the battery cell of the present application, the electric core component can be quickly placed in the center of the shell body, and the assembly difficulty is low.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. The battery cell includes a battery core component and a shell for accommodating the battery core component. At present, when the battery core component is installed in the shell, it is difficult to align the battery core component and the shell, that is, the battery core component is not easy to be centered after being installed in the shell, which makes assembly difficult and the consistency of the use effect of the battery cell is poor. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery and an electrical device. When assembling the battery cell, the battery core components can be quickly placed in the center of the shell body, and the assembly difficulty is low.

[0004] In the first aspect, an embodiment of the present application provides a battery cell, including: a shell component, including a shell body, wherein opposite ends of the shell body respectively form an open end and a first shell wall, the first shell wall is provided with a mounting hole, at least one side of the shell body adjacent to the first shell wall is a second shell wall, and a guide portion is provided between the second shell wall and the first shell wall, the guide portion includes a guide surface located in the shell body, and in the direction in which the open end points to the first shell wall, the distance between the guide surface and the inner wall surface of the second shell wall gradually increases; a pole component, installed on the first shell wall and covering the mounting hole, the pole component including a pole body arranged opposite to the mounting hole; a battery cell component, accommodated in the accommodating cavity of the shell body and connected to the pole body.

[0005] In the above technical solution, a guide portion is provided between the first shell wall and the second shell wall, and the guide portion includes a guide surface located in the shell body. After the battery core component is loaded into the shell body, the battery core component can cooperate with the guide surface so that the battery core component can be centered in the shell body. Due to the limiting effect of the guide surface, during assembly, the battery core component can be directly placed in the shell body until the battery core component and the guide surface are in contact and cooperate with each other, so that the battery core component can be centered in the shell body. The assembly difficulty is small, which is conducive to improving the assembly speed and ensuring the consistency of the relative position of the battery core component and the shell body; after the battery core component is loaded into the shell, the position is centered, so that the pole ear piece connected to the pole body has better symmetry, and the end of the partial pole ear piece connected to the active material coating portion will not be too far away from the pole body. When the battery core component expands, the pole ear piece is not easily excessively pulled.

[0006] In some embodiments, at least two sides of the shell body adjacent to the first shell wall form a second shell wall.

[0007] In the above technical solution, the battery cell component can be limited on at least two sides, the limitation is more stable, the position of the battery cell component is not easy to shift, and it can be stably set in the center of the shell body.

[0008] In some embodiments, the shell body has a first direction and a second direction parallel to the outer wall surface of the first shell wall, the size of the first shell wall in the first direction is larger than the size of the first shell wall in the second direction, and the shell body is located at both ends of the first direction and the second direction to form a second shell wall.

[0009] In the above technical solution, the guide parts around the shell component can limit the battery core component, the limiting is more stable, the battery core component is not easy to deflect, and the limiting effect is good.

[0010] In some embodiments, in a direction perpendicular to the second shell wall, a size of the first shell wall is smaller than a distance between the second shell wall and another opposite shell wall, and the first shell wall is connected to the second shell wall via a guide portion.

[0011] In the above technical solution, the size of the first shell wall is smaller, so the structural strength of the first shell wall is better. The pole component is installed on the first shell wall, the deflection is small during pulling and pushing and twisting of the pole, and it is not easy to deform. The strength of the pole component when riveted to the first shell wall is higher.

[0012] In some embodiments, the wall thickness of the guide portion and the wall thickness of the second shell wall are smaller than the wall thickness of the first shell wall.

[0013] In the above technical solution, the first shell wall is thicker to ensure sufficient structural strength, small deflection during pulling and pole pushing and twisting, not easy to deform, and sufficient connection strength between the first shell wall and the pole component.

[0014] In some embodiments, the guide surface is configured as a sloped surface.

[0015] In the above technical solution, the structure of the guide surface is relatively simple, easy to process, low in processing difficulty, low in manufacturing cost, and during installation, the battery cell components can be easily and quickly matched with the guide surface, and the installation difficulty is low.

[0016] In some embodiments, the guide portion is provided with an outer side surface located outside the shell body, and the outer side surface is parallel to the guide surface.

[0017] In the above technical solution, on the one hand, it is easy to process and can be formed by extrusion or stretching, and has strong manufacturability. On the other hand, the weight of the guide part can be made as light as possible, thereby reducing the weight of the shell body, which is beneficial to improving the energy density of the battery.

[0018] In some embodiments, the distance between the outer side surface and the guide surface is equal to the wall thickness of the second shell wall.

[0019] In the above technical solution, the guide portion and the second shell wall are not prone to fracture, the guide portion has good fatigue resistance, and the energy density of the battery cell is high.

[0020] In some embodiments, the guide surface is configured as an arc surface, and the radius of the guide surface is R, wherein 5 mm ≤ R ≤ 9 mm.

[0021] In the above technical solution, the radius of the guide surface is within this range, which can better ensure that the battery cell component is located in the center of the shell body without excessively affecting the energy density of the battery.

[0022] In some embodiments, the guide portion has an outer side surface located outside the shell body, and the outer side surface is configured as an arc surface.

[0023] In the above technical solution, when the guide part is formed, the shell body can be directly extruded or bent to form the guide part, which is easy to manufacture and convenient to manufacture.

[0024] In some embodiments, in a direction from the open end to the first shell wall, the distance between the outer side surface and the guide surface gradually increases.

[0025] In the above technical solution, the difference in wall thickness at the connection between the guide part and the first shell wall will not be too large, and the difference in wall thickness at the connection between the guide part and the second shell wall will not be too large. On the one hand, the structural strength of the guide part is higher, and the connection between the guide part and the first shell wall, and the connection between the guide part and the second shell wall are not easy to break; on the other hand, the difficulty of manufacturing the shell body can be reduced, and the shell body is more manufacturable.

[0026] In some embodiments, the minimum distance between the outer side surface and the guide surface is equal to the wall thickness of the second shell wall.

[0027] In the above technical solution, there will be no sudden change in thickness between the second shell wall and the guide portion, the structural strength of the guide portion is higher, and the integrity between the guide portion, the first shell wall and the second shell wall is better.

[0028] In some embodiments, the guide portion includes at least two sections, and in the direction from the second shell wall to the first shell wall, at least two sections are connected sequentially, and the latter is closer to the mounting hole than the former, any two adjacent sections are arranged at an angle, and at least the section of the at least two sections close to the first shell wall is provided with a guide surface.

[0029] In the above technical solution, the setting of the guide surface can limit the battery core component; when two battery cells are arranged side by side, the outer side surfaces of the two guide parts of the two battery cells will define an avoidance space to accommodate the shape part, thereby, the height of the pole component can be made lower, which is beneficial to reduce the mass and volume of the battery cell and improve the energy density of the battery.

[0030] In some embodiments, there are two sections, namely a first section and a second section. The first section is perpendicular to the second shell wall, and the second section is perpendicular to the first section and connected to the first shell wall and is provided with a guide surface.

[0031] In the above technical solution, on the one hand, the guide portion including the first section and the second section can limit the battery core component. After the battery core component is installed in the shell body, the battery core component can cooperate with the guide surface so that the battery core component can be centered in the shell body. On the other hand, the guide portion structure including only the first section and the second section is relatively simple, easy to process and shape, and not easy to deform.

[0032] In some embodiments, a first transition angle is provided between the first section and the second shell wall, and a second transition angle is provided between the second section and the first section.

[0033] In the above technical solution, a smooth transition can be achieved between the first section and the second shell wall, between the first section and the second section, and between the second section and the first shell wall, which is convenient for processing, has strong manufacturability, and is easy to form in one piece. At the same time, the stress at the connection between the first section and the second shell wall, the connection between the second section and the first section, and the connection between the second section and the first shell wall can also be reduced.

[0034] In some embodiments, the surface of one end of the pole body facing the battery core component is the inner end surface of the pole body, and the battery core component is connected to the inner end surface of the pole body through the conductive portion.

[0035] In the above technical solution, the difficulty of assembling and connecting the conductive part and the pole body can be reduced, the processing efficiency can be improved, and it is beneficial to shorten the length of the conductive part, saving materials and costs.

[0036] In some embodiments, the battery core component includes an active material coating portion accommodated in a housing cavity, and a pole ear portion connected to the active material coating portion, the pole ear portion includes a gathered portion formed by stacking and connecting multiple layers of pole ear sheets, at least part of the gathered portion is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body.

[0037] In the above technical solution, the gathering portion is laid on the inner end surface of the pole body so that the gathering portion is flattened and at least part of the gathering portion falls on the inner end surface of the pole body, thereby preventing the pole ear from being damaged due to bending the gathering portion, thereby improving the conductive performance and facilitating the welding nozzle to tighten the gathering portion, thereby improving the connection reliability between the gathering portion and the pole body.

[0038] In some embodiments, the battery core component includes an active material coating portion accommodated in the accommodating cavity, and a pole ear portion connected to the active material coating portion, and the pole ear portion is connected to the pole body through a conductive member.

[0039] In the above technical solution, the conductive member can be connected to the inner end surface of the pole body, so that the length of the conductive member can be shortened.

[0040] In some embodiments, the conductive member includes a first connecting section, the first connecting section includes two clamping portions, the pole lug portion includes a pole lug end portion, and the pole lug end portion is clamped between the two clamping portions and connected to the clamping portions.

[0041] In the above technical solution, the two clamping parts can be used to limit the end of the pole lug, thereby improving the connection reliability of the multiple layers of pole lug sheets in the end of the pole lug.

[0042] In some embodiments, the surface of one end of the pole body facing the battery core component is the inner end surface of the pole body, and the conductive member includes a second connecting segment, which is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body, and the conductive member is bent at the connecting position between the first connecting segment and the second connecting segment so that the first connecting segment is located on the side of the second connecting segment away from the pole body, and one of the clamping portions is supported on the side of the pole ear end away from the pole body.

[0043] In the above technical solution, the redundancy of the pole ear can be improved by the clamping part supporting the pole ear, and the risk of short circuit caused by the pole ear being inserted into the active material coating part can be reduced. In addition, the bent conductive part can play a role of buffer support, reducing the risk of the battery core component hitting the shell component and improving the reliability of the battery cell.

[0044] In some embodiments, the pole ear portion includes a gathered portion formed by stacking and connecting multiple pole ear sheets, the conductive member includes a first connecting segment, the gathered portion is stacked on one side of the first connecting segment in a thickness direction and connected to the first connecting segment.

[0045] In the above technical solution, the first connecting section is in the form of a plate, and the thickness direction of the first connecting section is consistent with that of the gathering portion, and the two are overlapped along the thickness direction of the first connecting section, so that the matching mode between the gathering portion and the conductive part is simple, which is conducive to improving production efficiency.

[0046] In some embodiments, the surface of one end of the pole body facing the battery core component is the inner end surface of the pole body, and the first connecting section is supported on the side of the gathering portion away from the pole body, so that the gathering portion is sandwiched between the inner end surface of the pole body and the first connecting section.

[0047] In the above technical solution, the redundancy of the pole ear portion can be improved by supporting the gathered portion through the first connecting section, and the risk of short circuit caused by the inverted insertion of the pole ear portion into the active material coating portion can be reduced.

[0048] In some embodiments, the battery cell further includes a pressure relief device, which is disposed on the housing component and is located on the same side or on the opposite side as the pole component.

[0049] In the above technical solution, the pressure relief device and the pole component are located on the same side. As a result, the design of the shell walls other than the second shell wall can be simplified, and the structure and processing of the battery cell can be simplified. The pressure relief device and the pole component are located on different sides, so there is no need to consider the space occupied by the pressure relief device in the second shell wall to reduce the volume of the pole component, so that the shape and volume of the pole component can be flexibly designed according to needs.

[0050] In some embodiments, the pole component includes a pole body, a transition structure and an insulating sealing structure, the transition structure surrounds the pole body and is connected to the first shell wall, and the insulating sealing structure is insulated and sealed between the transition structure and the pole body.

[0051] In the above technical solution, since the pole component includes not only the pole body but also the transition structure connected to the shell component, and an insulating sealing structure that plays an insulating and sealing role is arranged between the transition structure and the pole body, when the pole component is installed on the shell component and the transition structure and the shell component are connected, there is no need to arrange a seal between the transition structure and the shell component, and there is no need to apply a large sealing pressure to meet the compression degree of the seal there, so that the force on the second shell wall or the cover plate can be reduced, which plays a role in protecting the shell component, thereby helping to reduce the wall thickness of the shell component and reduce material costs.

[0052] In some embodiments, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the contour shape of the pole body matches the contour shape of the transition structure; or, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged at the length center of the transition structure and is circular.

[0053] In the above technical solution, the connection position between the transition structure and the pole body is evenly stressed, and the compression amount of the insulating sealing structure is easily controlled to improve the reliability of the sealing cooperation between the two.

[0054] In a second aspect, an embodiment of the present application further provides a battery, comprising the battery cell described above.

[0055] In the above technical solution, when assembling the battery cell, the assembly difficulty is low, and the battery cell component can be aligned with the shell body after being installed into the shell component, reducing the possibility of the pole tab and the pole body being pulled and broken, and the reliability of the battery can be improved.

[0056] In some embodiments, the battery includes a box assembly, the battery cells are multiple and accommodated in the box assembly, the bottom of the box assembly is the box bottom plate, and the shell component includes a cover plate covering the opening of the shell body, the opening of the shell body faces the box bottom plate, and the cover plate is covered on the bottom of the shell body; or, the opening of the shell body faces away from the box bottom plate, and the cover plate is covered on the top of the shell body.

[0057] In the above technical solution, once a battery cell experiences thermal runaway, the battery cell can release pressure from the bottom and the central exhaust channel design can be cancelled, further freeing up space for the battery cell, which is beneficial to the improvement of battery energy density. At the same time, directional pressure relief can be achieved quickly, and the ejected materials can be quickly discharged in the specified direction and through the optimal channel, and are not easy to spread to the surrounding battery cells.

[0058] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the battery cell or battery as described above.

[0059] In the above technical solution, the electrical device adopts the above-mentioned battery or battery cell. When the battery cell is assembled, the assembly difficulty is low. After the battery core component is installed in the shell component, it can be aligned with the shell body, reducing the possibility of the pole ear and the pole body being pulled and broken, improving the reliability of the battery, and being beneficial to improving the performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0061] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0062] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0063] Figure 3 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0064] Figure 4 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0065] Figure 5 A cross-sectional view of a shell body and a cover plate in a battery cell provided in some embodiments of the present application;

[0066] Figure 6 A schematic diagram of the processing process of the shell body provided in some embodiments of the present application;

[0067] Figure 7 A cross-sectional view of a battery cell provided for some other embodiments of the present application;

[0068] Figure 8 A cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0069] Fig. 9 A cross-sectional view of battery cells arranged side by side provided in some other embodiments of the present application;

[0070] Fig.10 A top view of a battery cell provided for some embodiments of the present application;

[0071] Fig.11 For along Fig.10 Sectional view along line AA;

[0072] Fig.12 A cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0073] Fig.13 for Fig.12 A partial enlarged view of

[0074] Fig.14 for Fig.13 A partial enlarged view of part A;

[0075] Fig.15 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0076] Fig.16 A schematic diagram of the structure of the cell components and the pole components in the battery cell provided in some embodiments of the present application.

[0077] icon:

[0078] Battery cell 20;

[0079] Shell component 21; Cover plate 22;

[0080] Battery cell component 23;

[0081] Active material coating portion 231; pole ear portion 232; pole ear end portion 2321; pole ear sheet 233;

[0082] Folding portion 234; electrode assembly 235; axial section 236 of the battery cell component; lamination portion 237;

[0083] Insulation 238;

[0084] Shell 24;

[0085] Open end 241; second shell wall 242; first shell wall 243; guide portion 244; guide surface 2441;

[0086] Outer side surface 2442; first section 2443; second section 2444; first transition angle 2445;

[0087] Second transition angle 2446; mounting hole 249; accommodating cavity 204;

[0088] Pole component 25;

[0089] Pole body 251; inner end surface 2511 of the pole body; transition structure 252; insulating sealing structure 253;

[0090] Conductive portion 26;

[0091] Conductive member 261; first connecting section 2611; clamping portion 2612; second connecting section 2613;

[0092] Pressure relief device 27; rolled aluminum plate 30; bar piece 40; U-shaped portion 41; aluminum shell 50; avoidance space 60;

[0093] Battery 100; box assembly 10; first part 101; second part 102;

[0094] Controller 200; motor 300; vehicle 1000; first direction F1; second direction F2. DETAILED DESCRIPTION

[0095] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0096] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application 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 drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0097] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0098] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0099] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can 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 application generally indicates that the associated objects before and after are in an "or" relationship.

[0100] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0101] The term "plurality" used in the present application refers to two or more (including two).

[0102] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery or a solid-state battery, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0103] The battery cell includes a shell, a battery core component and an electrolyte. The shell is used to contain the battery core component and the electrolyte (in a solid-state battery, it can be a solid electrolyte layer located between the positive and negative electrodes). The battery core component includes at least one electrode assembly, which is composed of a positive electrode sheet, a negative electrode sheet and a separator (this structure can be omitted in a solid-state battery). The electrode assembly can be a winding structure or a stacked structure. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.

[0104] The positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0105] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. The material of the isolation film is not limited, for example, it can be polypropylene or polyethylene, etc. In addition, the electrode assembly can be a winding structure or a laminated structure, and the embodiments of the present application are not limited to this.

[0106] 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.

[0107] In the manufacturing of battery cells in the related art, an active material layer is coated on the current collector and then cut to obtain a pole piece consisting of a current collector coated with an active material layer (referred to as an active material coating part) and a current collector not coated with an active material layer (referred to as a pole lug piece), and then the positive and negative pole pieces and the separator are stacked or wound in sequence to obtain an electrode assembly, in which multiple pole lug pieces are stacked to form a pole lug part. The pole lug part is connected to the adapter to form a conductive part, or the pole lug part itself forms a conductive part; the active material coating part and the conductive part form a battery core component. A pole post is provided on the shell of the battery cell. When the battery cell is manufactured, the conductive part is usually welded to the pole post to ensure the normal charging and discharging operation.

[0108] When the battery core components are installed in the shell body, the battery core components are in a dry and compressed state. After the shell body is filled with electrolyte, the battery core components will absorb the electrolyte to expand and become thicker. Therefore, the size of the housing cavity of the shell body is usually larger than the size of the corresponding position of the battery core components. However, since the size of the housing cavity of the shell body is larger than the size of the corresponding position of the battery core components, it is difficult to align the battery core components with the shell body after the battery core components are installed in the shell, that is, it is difficult to arrange the battery core components well in the center of the shell body. When the battery core components are not aligned with the shell body, the end of some of the pole tabs connected to the active material coating part will be farther away from the pole. When the battery core components expand, the pole tabs of this part are easily broken after being pulled, resulting in poor battery performance and poor consistency in the performance of the battery cells.

[0109] Based on the above considerations, in order to reduce the difficulty of assembling the battery core components so that the battery core components can be aligned with the shell body after being installed into the shell, the present application proposes a battery cell, the battery cell includes a shell component, a pole component and a battery core component, the shell component includes a shell body, the opposite ends of the shell body respectively form an open end and a first shell wall, the first shell wall is provided with a mounting hole, at least one side of the shell body adjacent to the first shell wall is a second shell wall, a guide portion is provided between the second shell wall and the first shell wall, the guide portion includes a guide surface located in the shell body, in the direction in which the open end points to the first shell wall, the distance between the guide surface and the inner wall surface of the second shell wall gradually increases; the pole component is installed on the first shell wall and covered on the mounting hole, the pole component includes a pole body arranged opposite to the mounting hole; the battery core component is accommodated in the accommodating cavity of the shell body and connected to the pole body.

[0110] In a battery cell of this structure, a guide portion is provided between the first shell wall and the second shell wall, the guide portion includes a guide surface located in the shell body, after the battery core component is loaded into the shell body, the battery core component can cooperate with the guide surface so that the battery core component can be centered in the shell body, due to the limiting effect of the guide surface, during assembly, the battery core component can be directly placed in the shell body until the battery core component and the guide surface are in contact and cooperate, so that the battery core component can be centered in the shell body, the assembly difficulty is small, it is beneficial to improve the assembly speed, and ensure the consistency of the relative position of the battery core component and the shell body; after the battery core component is loaded into the shell, the position is centered, thereby, the pole ear piece connected to the pole body has better symmetry, and the end of the partial pole ear piece connected to the active material coating portion will not be too far away from the pole body, and when the battery core component expands, the pole ear piece is not easily excessively pulled.

[0111] The embodiment of the present application provides an electric device using the battery cell of the present disclosure as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0112] For the convenience of explanation, the following embodiments are described by taking a vehicle as an example of an electrical device in one embodiment of the present application. Figure 1 , Figure 1 The power-consuming device provided for some embodiments of the present application is a schematic diagram of the structure of a vehicle. The vehicle 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 100 is provided inside the vehicle, and the battery 100 may be provided at the bottom, head or tail of the vehicle. The battery 100 may be used to power the vehicle, for example, the battery 100 may be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery 100 may be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0113] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing assembly 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the housing assembly 10 .

[0114] Among them, the box assembly 10 is used to provide a storage space for the battery cell 20, and the box assembly 10 can adopt a variety of structures. In some embodiments, the box assembly 10 may include a first part 101 and a second part 102, the first part 101 and the second part 102 cover each other, and the first part 101 and the second part 102 jointly define a storage space for accommodating the battery cell 20. The second part 102 may be a hollow structure with one end open, and the first part 101 may be a plate-like structure, and the first part 101 covers the open side of the second part 102, so that the first part 101 and the second part 102 jointly define a storage space; the first part 101 and the second part 102 may also be hollow structures with one side open, and the open side of the first part 101 covers the open side of the second part 102. Of course, the box assembly 10 formed by the first part 101 and the second part 102 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0115] The box assembly 10 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 20. Of course, some batteries 100 may not include the box assembly 10 and may be directly installed in the battery installation compartment of the electrical device.

[0116] In the battery 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box assembly 10; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box assembly 10. The battery 100 may also include other structures, for example, the battery 100 may also include a converging component for realizing electrical connection between multiple battery cells 20.

[0117] Hereinafter, a battery cell 20 according to an embodiment of the present application will be described with reference to the drawings.

[0118] Please refer to Figures 3 to 8 As shown, Figure 3 A cross-sectional view of a battery cell provided for some embodiments of the present application; Figure 4 A partial cross-sectional view of a battery cell provided for some embodiments of the present application; Figure 5 A cross-sectional view of a shell body 24 and a cover plate 22 in a battery cell provided in some embodiments of the present application; Figure 6 A schematic diagram of the processing process of the shell body provided in some embodiments of the present application; Figure 7 A cross-sectional view of a battery cell provided for some other embodiments of the present application; Figure 8 A cross-sectional view of a battery cell provided in some further embodiments of the present application.

[0119] The battery cell 20 includes a shell component 21, a pole component 25 and a cell component 23. The shell component 21 includes a shell body 24. The opposite ends of the shell body 24 respectively form an open end 241 and a first shell wall 243. The first shell wall 243 is provided with a mounting hole 249. At least one side of the shell body 24 adjacent to the first shell wall 243 is a second shell wall 242. A guide portion 244 is provided between the second shell wall 242 and the first shell wall 243. The guide portion 244 includes a guide surface 2441 located in the shell body 24. In the direction in which the open end 241 points to the first shell wall 243, the distance between the guide surface 2441 and the inner wall surface of the second shell wall 242 gradually increases; the pole component 25 is installed on the first shell wall 243 and covers the mounting hole 249. The pole component 25 includes a pole body 251 arranged opposite to the mounting hole 249; the cell component 23 is accommodated in the accommodating cavity 204 of the shell body 24 and is connected to the pole body 251.

[0120] For example, the second shell wall 242 can be integrally formed with the first shell wall 243, so that the structural integrity of the shell body 24 is good, fatigue cracking is not likely to occur at the connection between the first shell wall 243 and the second shell wall 242, and processing is convenient. In addition, the second shell wall 242 can also be formed separately from the first shell wall 243, and the second shell wall 242 and the first shell wall 243 are welded or connected by fasteners. During assembly, the first shell wall 243 and the second shell wall 242 are first connected to form the shell body 24, and then the battery core component 23 is installed in the shell body 24.

[0121] For example, in combination Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 The shell component 21 may include a shell body 24 and a cover plate 22, one end of the shell body 24 is an open end 241, the cover plate 22 covers the open end 241, and the shell body 24 and the cover plate 22 together form a receiving chamber 204. Alternatively, illustratively, the shell component 21 may include two shell bodies 24, one end of each shell body 24 has an open end 241, the open ends 241 of the two shell bodies 24 are opposite and cover each other, and the two shell bodies 24 together form a receiving chamber 13.

[0122] Specifically, the wall surface of the guide portion 244 located outside the shell body 24 can be parallel to the guide surface 2441 or non-parallel to the guide surface 2441, and the guide surface 2441 between the second shell wall 242 and the first shell wall 243 on one side can be an inclined plane or an arc surface, or can include multiple surfaces extending in different directions and arranged continuously. In the direction in which the open end 241 points to the first shell wall 243, the distance between the guide surface 2441 and the inner wall surface of the second shell wall 242 gradually increases; this includes that the distance between the entire guide surface 2441 and the inner wall surface of the second shell wall 242 increases linearly or non-linearly; or, only the distance between a part of the guide surface 2441 and the inner wall surface of the second shell wall 242 increases linearly or non-linearly, and the distance between the other part of the guide surface 2441 and the inner wall surface of the second shell wall 242 remains unchanged.

[0123] The battery cell component 23 may include one electrode assembly 235, or may include multiple electrode assemblies 235, and the multiple electrode assemblies 235 are arranged side by side in the accommodating cavity 204 of the shell body 24. The shell body 24 may be made of aluminum alloy, steel, aluminum-plastic film, plastic or other materials resistant to electrolyte corrosion, and may be designed and selected according to actual needs.

[0124] In some embodiments, the guide surface 2441 is relatively large and the ear portion 232 of the battery cell component 23 is relatively short. The guide surface 2441 can guide the battery cell component 23 in the process of being installed into the shell body 24. As a result, the ear portion 232 or the ear portion 232 and the pole body 251 connected to the ear portion 232 can be moved into the mounting hole 249 in the direction facing the mounting hole 249, which is conducive to the smooth installation of the ear portion 232 and the pole body 251 into the mounting hole 249.

[0125] The cell component 23 includes an electrode assembly 235, and the electrode assembly 235 directly cooperates with the guide surface 2441 of the guide portion 244, so that the cell component 23 can be located in the center of the shell body 24. Alternatively, the cell component 23 includes the electrode assembly 235 and an insulating member 238, and the insulating member 238 is disposed between the first shell wall 243 and the electrode assembly 235 to separate the shell body 24 and the electrode assembly 235. After the cell component 23 is installed in the shell body 24, the insulating member 238 cooperates with the guide portion 244.

[0126] According to the battery cell 20 of the embodiment of the present application, a guide portion 244 is provided between the first shell wall 243 and the second shell wall 242, and the guide portion 244 includes a guide surface 2441 located in the shell body 24. After the battery cell component 23 is installed in the shell body 24, the battery cell component 23 can cooperate with the guide surface 2441 so that the battery cell component 23 can be centered in the shell body 24. Due to the limiting effect of the guide surface 2441, during assembly, the battery cell component 23 is directly placed in the shell body 24 until the battery cell component 23 and the guide surface 2441 are in contact. The battery cell component 23 can be centered in the shell body 24 with low assembly difficulty, which is beneficial to improving the assembly speed and ensuring the consistency of the relative positions of the battery cell component 23 and the shell body 24; after the battery cell component 23 is installed in the shell body 24, the position is centered, so that the pole ear piece 233 connected to the pole body 251 has good symmetry, and the end of the pole ear piece 233 connected to the active material coating part 231 will not be too far away from the pole body 251. When the battery cell component 23 expands, the pole ear piece 233 is not easily pulled excessively.

[0127] In some optional embodiments of the present application, reference may be made to Figure 4 , Figure 5 , 7 and Figure 8 As shown, at least two sides of the shell body 24 adjacent to the first shell wall 243 form a second shell wall 242 .

[0128] For example, the shell body 24 has a first direction F1 and a second direction F2 that are parallel to the outer wall surface of the first shell wall 243, and the size of the first shell wall 243 in the first direction F1 is greater than the size of the first shell wall 243 in the second direction F2; wherein the side walls of the shell body 24 adjacent to the first shell wall 243 and on both sides in the first direction F1 form the second shell wall 242; or, the side walls of the shell body 24 adjacent to the first shell wall 243 and on both sides in the second direction F2 form the second shell wall 242; or, the side walls of the shell body 24 adjacent to the first shell wall 243 and on both sides in the first direction F1 and one side wall of the shell body 24 adjacent to the first shell wall 243 and on the second direction F2 form the second shell wall 242. Two shell walls 242; or, one side wall of the shell body 24 adjacent to the first shell wall 243 and in the first direction F1 and both side walls of the shell body 24 adjacent to the first shell wall 243 and in the second direction F2 form the second shell wall 242; or, both side walls of the shell body 24 adjacent to the first shell wall 243 and in the first direction F1 and both side walls of the shell body 24 adjacent to the first shell wall 243 and in the second direction F2 form the second shell wall 242; or, one side of the shell body 24 adjacent to the first shell wall 243 and in the first direction F1 and one side of the shell body 24 adjacent to the first shell wall 243 and in the second direction F2 form the second shell wall 242.

[0129] The battery cell 20 may be a rectangular parallelepiped, with the length direction of the battery cell 20 being the first direction F1 and the thickness direction of the battery cell 20 being the second direction F2. However, this is not limiting, in other embodiments of the present application, the battery cell 20 may also be a cylinder, a flat body or other shapes.

[0130] The shell body 24 forms a second shell wall 242 on at least two sides adjacent to the first shell wall 243. That is to say, the first shell wall 243 is provided with a guide portion 244 on at least two sides. The guide portions 244 on both sides can cooperate with the battery cell component 23 to limit at least two sides of the battery cell component 23. The limiting is more stable, and the position of the battery cell component 23 is not easy to shift, and can be stably set in the center of the shell body 24.

[0131] In some optional embodiments of the present application, the shell body 24 has a first direction F1 and a second direction F2 parallel to the outer wall surface of the first shell wall 243, the size of the first shell wall 243 in the first direction F1 is larger than the size of the first shell wall 243 in the second direction F2, and the shell body 24 is located at both ends of the first direction F1 and the second direction F2 to form a second shell wall 242.

[0132] That is to say, guide portions 244 are provided on both sides of the first shell wall 243 in the first direction F1 and on both sides of the first shell wall 243 in the second direction F2. Therefore, after the battery cell component 23 enters the shell, the guide portions 244 around the shell component 21 can limit the battery cell component 23, and the limiting is more stable. The battery cell component 23 is not easy to deflect, and the limiting effect is good, which is conducive to the central and symmetrical arrangement of the battery cell component 23 in the shell component 21. The battery cell component 23 is not easy to deflect in the first direction F1 and the second direction F2.

[0133] In some optional embodiments of this application, please refer again to Figure 4 In a direction perpendicular to the second shell wall 242 , a dimension D1 of the first shell wall 243 is smaller than a distance D2 between the second shell wall 242 and another opposite shell wall, and the first shell wall 243 is connected to the second shell wall 242 via a guide portion 244 .

[0134] For example, the shell body 24 is adjacent to the first shell wall 243 and forms the second shell wall 242 on both sides in the first direction F1, and the distance between the second shell walls 242 on both sides in the first direction F1 is greater than the dimension of the first shell wall 243 in the first direction F1. In other words, compared with the second shell wall being directly connected to the first shell wall, the dimension D1 of the first shell wall 243 connected to the second shell wall 242 through the guide portion 244 is smaller in the direction perpendicular to the second shell wall 242.

[0135] It should be noted that the size D1 of the first shell wall 243 is smaller, so that the structural strength of the first shell wall 243 is better. The pole component 25 is installed on the first shell wall 243, and the deflection is small during pulling and twisting of the pole, and it is not easy to deform. The strength of the pole component 25 and the first shell wall 243 when riveted is higher, and the connection between the first shell wall 243 and the pole component 25 is not easy to be damaged; or, on the premise of meeting the pulling and twisting strength, the thickness of the first shell wall 243 can be reduced to improve the energy density and reduce the weight of the battery cell 20.

[0136] In some optional embodiments of the present application, reference may be made to Figure 5 , the wall thickness h2 of the guide portion 244 and the wall thickness h3 of the second shell wall 242 are smaller than the wall thickness h1 of the first shell wall 243 .

[0137] For example, the wall thickness h2 of the guide portion 244 may be equal to the wall thickness h3 of the second shell wall 242, or may be greater than the wall thickness h3 of the second shell wall 242, or less than the wall thickness h3 of the second shell wall 242. For example, the wall thickness h2 of the guide portion 244 is 0.8 times the wall thickness of the second shell wall 242, or, the wall thickness h2 of the guide portion 244 is 1.2 times the wall thickness h3 of the second shell wall 242. No specific limitation is made herein.

[0138] It should be noted that the first shell wall 243 needs to install the pole component 25. Therefore, the wall thickness h1 of the first shell wall 243 is relatively thick to ensure sufficient structural strength, small deflection during pulling and pushing and twisting of the pole, and not easy to deform. There is sufficient connection strength between the first shell wall 243 and the pole component 25 to reduce the possibility of the pole component 25 falling off and loosening; the second shell wall 242 and the guide part 244 are mainly used to define the accommodating cavity 204 for accommodating the battery core component 23, so they can be thinner to reduce the weight of the battery cell 20 and improve the energy density of the battery.

[0139] In some optional embodiments of the present application, reference may be made to Figures 3 to 6 As shown, the guide surface 2441 is configured as an inclined surface.

[0140] That is, the guide surface 2441 is an inclined plane. Figure 6 As shown, when processing the shell body 24 with the guide surface 2441 of the guide portion 244 being an inclined surface, the rolled aluminum plate 30 can first be stretched to form an aluminum shell 50, and then the corresponding position of the aluminum shell 50 is extruded to form the shell body 24 with the guide portion 244 having the guide surface 2441 being an inclined surface. By adopting a step-by-step stretching method, the possibility of tensile rupture of the shell body 24 during manufacturing can be reduced, thereby enhancing manufacturability.

[0141] The guide surface 2441 is constructed as an inclined surface, so that the structure of the guide surface 2441 is relatively simple, convenient for processing, low in processing difficulty, and low in manufacturing cost. During installation, the battery cell component 23 can be easily and quickly matched with the guide surface 2441, and the installation difficulty is low.

[0142] In some optional embodiments of the present application, reference may be made to Figures 3 to 6 The guide portion 244 has an outer side surface 2442 located outside the shell body 24 , and the outer side surface 2442 is parallel to the guide surface 2441 .

[0143] That is, the thickness of the guide portion 244 is consistent at all locations. In other embodiments, the outer side surface 2442 of the guide portion 244 located outside the shell body 24 may not be parallel to the guide surface 2441. For example, the outer side surface 2442 of the guide portion 244 located outside the shell body 24 includes a first wall surface coplanar with the outer side surface 2442 of the first shell wall 243 located outside the shell body 24 and a second wall surface coplanar with the outer side surface 2442 of the second shell wall 242 located outside the shell body 24. Alternatively, the guide surface 2441 is an inclined surface, and the outer side surface 2442 of the guide portion 244 located outside the shell body 24 is an arcuate surface.

[0144] The outer side surface 2442 of the guide portion 244 is parallel to the guide surface 2441. In this way, on the one hand, it is easy to process and can be formed by extrusion or stretching, and has strong manufacturability. On the other hand, the weight of the guide portion 244 can be made as light as possible, thereby reducing the weight of the shell body 24, which is beneficial to improving the energy density of the battery 100.

[0145] In some optional embodiments of the present application, reference may be made to Figure 5 As shown, the distance between the outer side surface 2442 and the guide surface 2441 is equal to the wall thickness h3 of the second shell wall 242 .

[0146] Here, only a portion of the distance between the outer side surface 2442 and the guide surface 2441 may be equal to the wall thickness h3 of the second shell wall 242 ; or, the outer side surface 2442 is parallel to the guide surface 2441 , and the wall thickness h2 of the guide portion 244 is equal to the wall thickness h3 of the second shell wall 242 .

[0147] The guide portion 244 is connected between the second shell wall 242 and the first shell wall 243. If the wall thickness h2 of the guide portion 244 is too small, the fatigue resistance of the guide portion 244 is poor, which affects the service life of the battery cell 20. If the wall thickness h2 of the guide portion 244 is too large, the weight of the shell body 24 will be increased, thereby reducing the energy density of the battery cell 20. There is a thickness difference between the guide portion 244 and the second shell wall 242, and the junction between the guide portion 244 and the second shell wall 242 is prone to fracture. Therefore, in this embodiment, the spacing between the outer side surface 2442 and the guide surface 2441 is equal to the wall thickness h3 of the second shell wall 242. In this way, the guide portion 244 is not prone to fracture between the second shell wall 242, the fatigue resistance of the guide portion 244 is good, and the energy density of the battery cell 20 is high.

[0148] In some optional embodiments of the present application, reference may be made to Figure 7 As shown, the guide surface 2441 is constructed as an arc surface, and the radius of the guide surface 2441 is R, wherein 5mm≤R≤9mm.

[0149] For example, the radius of the guide surface 2441 can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or any value between any two values.

[0150] If the radius of the guide surface 2441 is too small, the limiting effect on the battery cell component 23 is poor. After the battery cell component 23 cooperates with the guide surface 2441, the battery cell component 23 is still easy to deflect relative to the shell body 24 and cannot be well located in the center of the shell body 24; if the radius of the guide surface 2441 is too large, the internal space of the shell body 24 will be reduced too much, so that the space inside the shell body 24 that can be used to accommodate the battery cell component 23 is reduced, which is not conducive to improving the energy density of the battery 100. When the radius of the guide surface 2441 is within this range, it can better ensure that the battery cell component 23 is located in the center of the shell body 24 without affecting the energy density of the battery 100 too much.

[0151] In some optional embodiments of the present application, reference may be made again to Figure 7 The guide portion 244 has an outer side surface 2442 located outside the shell body 24, and the outer side surface 2442 is constructed as an arc surface.

[0152] For example, the outer side surface 2442 of the guide portion 244 is an arc surface, and the inner side surface of the guide portion 244 is an inclined surface; or, the outer side surface 2442 of the guide portion 244 and the inner side surface of the guide portion 244 are both arc surfaces. The outer side surface 2442 of the guide portion 244 is an arc surface, that is, the outer side surface 2442 of the guide portion 244 has no edges and corners, and the stress of each part of the guide portion 244 is relatively uniform, not easy to deform, and has a more beautiful appearance.

[0153] In the embodiment where both the outer side surface 2442 and the inner side surface of the guide portion 244 are arc surfaces, the guide portion 244 can be directly extruded or bent into the shell body 24 during molding, which is easy to manufacture and convenient to manufacture. The guide surface 2441, which is an arc surface, can limit the position of the battery core component 23. After the battery core component 23 is installed in the shell body 24, the battery core component 23 can cooperate with the guide surface 2441 so that the battery core component 23 can be centered in the shell body 24.

[0154] It should be noted that the pole components 25 of the plurality of battery cells 20 are connected by a bus bar or a metal sheet (eg Fig. 9 The tabs 40 in the battery cell 20 are electrically connected to each other. During the operation of the battery cell 20, the battery cell 20 will inevitably expand and contract. Therefore, the tabs 40 are usually provided with a U-shaped portion 41. When the battery cell 20 expands, the U-shaped portion 41 will be pulled into a U-shaped portion with a smaller arc. When it contracts, the U-shaped portion 41 will become a U-shaped portion with a larger arc. In the related art, the height of the pole component is usually set higher so that a space for accommodating the U-shaped portion is formed between adjacent pole components, which will increase the height and weight of the battery cell.

[0155] On the premise that the outer side surface 2442 of the guide portion 244 is an inclined surface or an arc surface, adjacent battery cells 20 are arranged side by side. When the outer side surfaces 2442 of the guide portions 244 of adjacent battery cells 20 are relatively set, the outer side surfaces 2442 of the guide portions 244 of adjacent battery cells 20 will define an avoidance space 60, and the avoidance space 60 can accommodate the U-shaped portion 41. As a result, the height of the pole component 25 can be made lower, which is beneficial to reducing the mass and volume of the battery cell 20 and improving the energy density of the battery 100.

[0156] In some optional embodiments of the present application, reference may be made to Figure 7 As shown, in the direction from the open end 241 to the first shell wall 243 , the distance between the outer side surface 2442 and the guide surface 2441 gradually increases.

[0157] For example, the guide surface 2441 and the outer side surface 2442 of the guide portion 244 are both arc surfaces, the radius of the arc surface of the guide surface 2441 is greater than the radius of the guide surface 2441 of the guide portion 244, and the center of the guide surface 2441 is arranged closer to the inside than the center of the guide portion 244. The end of the guide portion 244 with a larger wall thickness h2 is connected to the first shell wall 243, and the end of the guide portion 244 with a smaller wall thickness h2 is connected to the second shell wall 242. In this way, the difference in wall thickness at the connection between the guide portion 244 and the first shell wall 243 will not be too large, and the difference in wall thickness at the connection between the guide portion 244 and the second shell wall 242 will not be too large. On the one hand, the structural strength of the guide portion 244 is higher, and the connection between the guide portion 244 and the first shell wall 243 and the connection between the guide portion 244 and the second shell wall 242 is not easy to break; on the other hand, the difficulty of manufacturing the shell body 24 can be reduced, and the shell body 24 is more manufacturable.

[0158] In some optional embodiments of the present application, the minimum distance between the outer side surface 2442 and the guide surface 2441 is equal to the wall thickness h3 of the second shell wall 242 .

[0159] In an embodiment in which the distance between the outer side surface 2442 and the guide surface 2441 gradually increases in the direction from the open end 241 to the first shell wall 243, the minimum distance between the outer side surface 2442 and the guide surface 2441 is equal to the wall thickness h3 of the second shell wall 242, that is, the wall thickness of the end where the guide portion 244 is connected to the second shell wall 242 is equal to the wall thickness h3 of the second shell wall 242. In this way, there is no sudden change in thickness between the second shell wall 242 and the guide portion 244, the structural strength of the guide portion 244 is higher, and the integrity between the guide portion 244, the first shell wall 243, and the second shell wall 242 is better.

[0160] In some embodiments, in the direction in which the open end 241 points to the first shell wall 243, the wall thickness h2 of the guide portion 244 gradually increases. For example, the wall thickness of the end of the guide portion 244 connected to the first shell wall 243 is equal to the wall thickness h1 of the first shell wall 243, and the wall thickness of the end of the guide portion 244 connected to the second shell wall 242 is equal to the wall thickness h3 of the second shell wall 242. In this way, there will be no sudden changes in the thickness between the first shell wall 243 and the guide portion 244, and between the second shell wall 242 and the guide portion 244. The structural strength of the guide portion 244 is higher, and the integrity between the guide portion 244, the first shell wall 243, and the second shell wall 242 is better.

[0161] In some optional embodiments of the present application, reference may be made to Figure 8 and Fig. 9 As shown, Fig. 9The cross-sectional view of battery cells arranged side by side in some other embodiments of the present application. The guide portion 244 includes at least two sections, and in the direction from the second shell wall 242 to the first shell wall 243, at least two sections are connected in sequence, and the latter is closer to the mounting hole 249 than the former, and any two adjacent sections are arranged at an angle, and at least one section of the at least two sections close to the first shell wall 243 is provided with a guide surface 2441.

[0162] For example, the guide portion 244 may include two connected sections, three sections, or four sections, etc., which are not specifically limited here. In the embodiment where the guide portion 244 includes two sections, the section close to the first shell wall 243 is provided with a guide surface 2441 or both sections are provided with a guide surface 2441; in the embodiment where the guide portion 244 includes three sections, only one section may be provided with a guide surface 2441, or two sections may be provided with a guide surface 2441, or three sections may be provided with a guide surface 2441. In the embodiment where there are multiple guide surfaces 2441, the multiple guide surfaces 2441 may be connected to each other or may not be connected to each other.

[0163] Any two adjacent sections are arranged at an angle. For example, the angle between the outer side surfaces 2442 of two sections can be 90 degrees, 100 degrees, 110 degrees, 120 degrees, 130 degrees, 140 degrees, 150 degrees, 160 degrees, 170 degrees, etc.

[0164] The setting of the guide surface 2441 can limit the position of the battery core component 23. After the battery core component 23 is installed in the shell body 24, the battery core component 23 can cooperate with the guide surface 2441 so that the battery core component 23 can be centered in the shell body 24.

[0165] It should be noted that the pole components 25 of the plurality of battery cells 20 are connected by a bus bar or a metal sheet (eg Fig. 9 The tabs 40 in the battery cell 20 are electrically connected to each other. During the operation of the battery cell 20, the battery cell 20 will inevitably expand and contract. Therefore, the tabs 40 are usually provided with a U-shaped portion 41. When the battery cell 20 expands, the U-shaped portion 41 will be pulled into a U-shaped portion with a smaller arc. When it contracts, the U-shaped portion 41 will become a U-shaped portion with a larger arc. In the related art, the height of the pole component is usually set higher so that a space for accommodating the U-shaped portion is formed between adjacent pole components, which will increase the height and weight of the battery cell.

[0166] In the embodiment of the present application, a guide portion 244 including at least two sections is provided, and the two sections are provided at an angle, so that when two battery cells 20 are arranged side by side, the outer side surfaces 2442 of the two guide portions 244 of the two battery cells 20 will define an escape space 60 to accommodate the U-shaped portion 41, thereby, the height of the pole component 25 can be made lower, which is beneficial to reducing the mass and volume of the battery cell 20 and improving the energy density of the battery 100. In addition, the escape space 60 formed by the guide portion 244 including at least two sections is larger, and some other components can be avoided according to design requirements.

[0167] In some optional embodiments of the present application, there are two sections, namely the first section 2443 and the second section 2444. The first section 2443 is perpendicular to the second shell wall 242, the second section 2444 is perpendicular to the first section 2443, the second section 2444 is connected to the first shell wall 243, and the second section 2444 is provided with a guide surface 2441.

[0168] On the one hand, the guide portion 244 including the first section 2443 and the second section 2444 can limit the battery cell component 23. After the battery cell component 23 is installed in the shell body 24, the battery cell component 23 can cooperate with the guide surface 2441 so that the battery cell component 23 can be centered in the shell body 24. On the other hand, the guide portion 244 including only the first section 2443 and the second section 2444 has a simpler structure, is easy to process and shape, and is not prone to deformation.

[0169] In some optional embodiments of the present application, reference may be made to Figure 8 As shown, a first transition angle 2445 is provided between the first section 2443 and the second shell wall 242 , and a second transition angle 2446 is provided between the second section 2444 and the first section 2443 .

[0170] For example, a first transition chamfer or a first transition fillet may be provided between the inner wall surface of the first section 2443 and the inner wall surface of the second shell wall 242, a first transition chamfer or a first transition fillet may be provided between the outer wall surface of the first section 2443 and the outer wall surface of the second shell wall 242, a second transition chamfer or a second transition fillet may be provided between the inner wall surface of the second section 2444 and the inner wall surface of the first section 2443, a second transition chamfer or a second transition fillet may be provided between the outer wall surface of the second section 2444 and the outer wall surface of the first section 2443, a third transition chamfer or a third transition fillet may be provided between the inner wall surface of the second section 2444 and the inner wall surface of the first shell wall 243, and a third transition chamfer or a third transition fillet may be provided between the outer wall surface of the second section 2444 and the outer wall surface of the first shell wall 243.

[0171] As a result, a smooth transition can be achieved between the first section 2443 and the second shell wall 242, between the first section 2443 and the second section 2444, and between the second section 2444 and the first shell wall 243, which is convenient for processing, has strong manufacturability, and is easy to form in one piece. At the same time, the stress at the connection between the first section 2443 and the second shell wall 242, the connection between the second section 2444 and the first section 2443, and the connection between the second section 2444 and the first shell wall 243 can also be reduced.

[0172] According to some embodiments of the present application, reference may be made to Figures 10 to 13 As shown, Fig.10 A top view of a battery cell provided for some embodiments of the present application; Fig.11 For along Fig.10 Sectional view along line AA; Fig.12 A cross-sectional view of a battery cell provided in some other embodiments of the present application; Fig.13 for Fig.12 The surface of the pole body 251 facing the battery cell component 23 (i.e., the surface facing the active material coating portion 231) is the inner end surface 2511 of the pole body, and the battery cell component 23 is connected to the inner end surface 2511 of the pole body through the conductive portion 26 (e.g., the pole ear portion 232 or the conductive member 261).

[0173] The electrode component includes one or more electrode assemblies 235 . The portion of the current collector in the electrode assembly 235 coated with the active material layer constitutes an active material coating portion 231 , and the portion not coated with the active material layer constitutes an electrode ear portion 232 .

[0174] Therefore, the difficulty of assembling and connecting the conductive part 26 and the pole body 251 can be reduced, the processing efficiency can be improved, and the length of the conductive part 26 can be shortened, saving materials and costs.

[0175] According to some embodiments of this application, please refer to Fig.11 and Fig.13 , at least part of the conductive part 26 is laid on the inner end surface 2511 of the pole body. In this way, by laying at least part of the conductive part 26 on the inner end surface 2511 of the pole body, the at least part of the conductive part 26 is in a flattened state, and the projection of the at least part of the conductive part 26 falls on the inner end surface 2511 of the pole body, which is conducive to improving the connection reliability between the conductive part 26 and the pole body 251, and is conducive to increasing the connection area between the conductive part 26 and the pole body 251, and improving the conductivity.

[0176] Please refer to the figure again. For example, when the battery cell 20 is in the assembled state, the inner end surface of the pole body 251 is parallel to the axial section 236 of the battery cell component, and the pole ear direction of the battery cell component 23 is the direction in which the active material coating part 231 extends out of the pole ear part 232, which is perpendicular to the first shell wall 242. Therefore, the processing and design of the pole body 251 are convenient.

[0177] According to some embodiments of the present application, when the battery cell 20 is in an assembled state (eg Fig.16 As shown, Fig.16 Schematic diagram of the structure of the cell components and the pole components in the battery cell provided in some embodiments of the present application), the inner end face 2511 of the pole body is inclined relative to the axial section 236 of the cell component, and the axial section 236 of the cell component is perpendicular to the direction of the pole ear of the cell component 23.

[0178] The tab direction of the battery cell component 23 is the direction in which the active material coating portion 231 extends out of the tab portion 232 , and this direction is perpendicular to the first shell wall 242 . In this way, before laying at least part of the conductive part 26 on the inner end surface of the pole body 251, the pole component 25 can be adjusted to the inner end surface of the pole body 251 parallel to the direction of the pole ear of the battery cell component 23, so as to facilitate laying at least part of the conductive part 26 on the inner end surface of the pole body 251, with a larger welding operation space, and at this time, the connection direction of the two ends of the pole body 251 (i.e., the end close to the battery cell component 23 and the end away from the battery cell component 23) is inclined to the direction of the pole ear of the battery cell component 23, so that after the conductive part 26 is connected to the pole body 251, the pole component 25 is flipped as a whole by less than 90°, which can satisfy the connection direction of the above-mentioned two ends of the pole body 251 parallel to the second shell wall 243 or the cover plate 22, thereby relative to the solution of the inner end surface of the pole body 251 being parallel to the axial section 236 of the battery cell component, the flipping angle of the pole component 25 can be reduced, which is beneficial to shortening the length of the conductive part 26.

[0179] According to some embodiments of the present application, reference may be made to Fig.11 As shown, the battery cell component 23 includes an active material coating portion 231 accommodated in the accommodating cavity 204 , and a pole ear portion 232 connected to the active material coating portion 231 , and the pole ear portion 232 includes a gathering portion 234 formed by stacking and connecting multiple layers of pole ear sheets 233 .

[0180] In this way, the multi-layered pole tabs 233 are connected to form a gathered portion 234, so that the multi-layered pole tabs 233 in the gathered portion 234 are electrically conductive, that is, the multi-layered pole tabs 233 in the gathered portion 234 not only present a stacked arrangement, but also have a connected and conductive relationship. Among them, the connection method of the multi-layered pole tabs 233 in the gathered portion 234 is not limited, for example, it can be welding (such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure melting welding, or brazing, etc.), or perforation connection, or bonding through conductive adhesive, etc. Exemplarily, the multi-layered pole tabs 233 of the same polarity can be ultrasonically welded, and the ultrasonic weld mark formed is the gathered portion 234.

[0181] Exemplarily, the multiple layers of tabs 233 in the gathered portion 234 may belong to the same electrode assembly 235, or may respectively belong to different electrode assemblies 235, that is, several layers of tabs 233 of the same polarity in the same electrode assembly 235 may be connected to form the gathered portion 234, or several layers of tabs 233 of the same polarity in different electrode assemblies 235 may be connected to form the gathered portion 234. Exemplarily, all tabs 233 of the same polarity in the electrode component may be connected to form the gathered portion 234, so that the number of gathered portions 234 may be reduced.

[0182] In the above technical scheme, the multi-layer pole ear sheets 233 in the pole ear portion 232 are pre-connected to form a gathered portion 234. The gathered portion 234 can present the form of a plate in which the multi-layer pole ear sheets 233 are connected together and have a certain rigidity, rather than a fluffy multi-layer foil form, thereby facilitating the assembly and connection operations between the pole ear portion 232 and other components, such as punching operations and welding operations, etc., so that it is not easy to form gaps in the weld formed by the pole ear portion 232 and other components, which can improve the connection reliability and conductivity of the welding point, and make the conductivity between the electrode component and the pole column component 25 more stable and reliable.

[0183] According to some embodiments of this application, please refer to Fig.11 As shown, at least a portion of the gathered portion 234 is laid on the inner end surface 2511 of the pole body and connected to the inner end surface 2511 of the pole body.

[0184] At this time, the conductive part 26 may only include the pole ear part 232, and the pole ear part 232 is directly connected to the pole body 251, so that the connection step between the conductive member 261 and the pole ear part 232 can be omitted. Moreover, by pre-connecting the multiple pole ear sheets 233 in the pole ear part 232 to form the gathered part 234, the gathered part 234 can present the form of a plate with a certain rigidity in which the multiple pole ear sheets 233 are connected together, rather than the form of a fluffy and scattered multiple foil sheets, so as to facilitate the matching connection between the pole ear part 232 and the pole body 251, so that the welding of the pole ear part 232 and the pole body 251 is more reliable, and it is not easy to form a gap in the weld, which can improve the connection reliability and conductivity of the welding point, and make the conduction of the electrode component and the pole component 25 more stable and reliable. Moreover, by laying the gathering portion 234 on the inner end surface 2511 of the pole body, the gathering portion 234 is in a flat and stretched state, and at least a part of the gathering portion 234 falls on the inner end surface 2511 of the pole body, so that the pole ear portion 232 will not be damaged due to bending the gathering portion 234, thereby improving the conductive performance and facilitating the welding nozzle to tighten the gathering portion 234, thereby improving the connection reliability between the gathering portion 234 and the pole body 251.

[0185] According to some embodiments of this application, please refer to Fig.11 As shown, the entirety of the gathered portion 234 is laid on the inner end surface 2511 of the pole body.

[0186] That is, the inner end surface 2511 of the pole body is greater than or equal to the area of ​​the gathered portion 234, so that the gathered portion 234 can completely fall on the inner end surface 2511 of the pole body, which is beneficial to increase the connection area between the inner end surface 2511 of the pole body and the gathered portion 234 and improve the current passing efficiency.

[0187] According to some embodiments of the present application, reference may be made to Figure 12 to Figure 14 As shown, the battery core component 23 includes an active material coating portion 231 accommodated in the accommodating cavity 204 , and a pole ear portion 232 connected to the active material coating portion 231 , and the pole ear portion 232 is connected to the pole body 251 through a conductive member 261 .

[0188] Thus, by indirectly connecting the pole ear portion 232 and the pole body 251 through the conductive member 261, the length of the pole ear portion 232 can be shortened, and the problems of wrinkling, bending and breaking of the pole ear piece 233 can be improved. Moreover, the shape and material of the conductive member 261 can be flexibly designed to reduce the difficulty of connection with the pole body 251 and improve the convenience of connection between the conductive member 261 and the pole body 251. In addition, the perforation operation of the conductive portion 26, the connection operation of the conductive portion 26 and the pole component 25 (which may not be required), and the connection operation of the pole component 25 and the shell component 21 are not likely to cause cracking at the connection position between the active material coating portion 231 and the pole ear portion 232, thereby improving the reliability of the battery cell 20.

[0189] The pole ear portion 232 of the electrode component includes a stacked portion 237 formed by stacking and gathering multiple pole ear sheets 233 , and the multiple pole ear sheets 233 in the stacked portion 237 are connected to form a gathered portion 234 , that is, the pole ear portion 232 includes a gathered portion 234 formed by stacking and connecting multiple pole ear sheets 233 .

[0190] Exemplarily, the lamination portion 237 can be connected to the conductive member 261, thereby eliminating the step of connecting the lamination portion 237 to form the gathered portion 234. Alternatively, exemplarily, the gathered portion 234 can be connected to the conductive member 261 after the multi-layered tabs 233 in the lamination portion 237 are connected to form the gathered portion 234, so that the structural form of the conductive member 261 can be flexibly and diversely designed.

[0191] For example, the conductive member 261 may be connected to the inner end surface 2511 of the pole body, thereby shortening the length of the conductive member 261. Fig.14 As shown, the conductive member 261 may include a second connection section 2613, and the second connection section 2613 may be laid on the inner end surface 2511 of the pole body and connected to the inner end surface 2511 of the pole body, thereby improving the connection reliability and conductive performance of the conductive member 261 and the pole body 251. Alternatively, illustratively, the conductive member 261 may also be connected to other positions of the pole body 251, for example, the conductive member 261 is pre-buried in the pole body 251, or is penetrated in the pole body 251 to be connected to the pole body 251, etc.

[0192] According to some embodiments of the present application, reference may be made to Fig.14 As shown, the conductive member 261 includes a first connecting section 2611 , the first connecting section 2611 includes two clamping portions 2612 , the pole ear portion 232 includes a pole ear end 2321 , and the pole ear end 2321 is clamped between the two clamping portions 2612 and connected to the clamping portions 2612 .

[0193] Among them, the pole ear end 2321 can be a laminated portion 237 or a gathered portion 234. Therefore, the two clamping portions 2612 can be used to limit the pole ear end 2321, thereby improving the connection reliability of the multi-layer pole ear sheet 233 in the pole ear end 2321. In addition, in some examples, by providing two clamping portions 2612, the pole ear end 2321 sandwiched between the two clamping portions 2612 can be in the state of a laminated portion 237, and the step of connecting the multi-layer pole ear sheets 233 in the laminated portion 237 to form the gathered portion 234 can be omitted, thereby simplifying the processing process and improving the processing efficiency.

[0194] According to some embodiments of this application, please refer to Fig.14The surface of one end of the pole body 251 facing the battery core component 23 is the inner end face 2511 of the pole body, the conductive member 261 includes a second connecting segment 2613, the second connecting segment 2613 is laid on the inner end face 2511 of the pole body and connected to the inner end face 2511 of the pole body, the conductive member 261 is bent at the connecting position between the first connecting segment 2611 and the second connecting segment 2613, so that the first connecting segment 2611 is located on the side of the second connecting segment 2613 away from the pole body 251, and one of the clamping portions 2612 is supported on the side of the pole ear end 2321 away from the pole body 251.

[0195] Thus, the support of the pole ear portion 232 by the clamping portion 2612 can improve the redundancy of the pole ear portion 232 and reduce the risk of short circuit caused by the pole ear portion 232 being inserted into the active material coating portion 231. In addition, the bent conductive member 261 can play a role of buffer support, reduce the risk of the electrode component hitting the shell component 21, and improve the reliability of the battery cell 20.

[0196] According to some embodiments of the present application, the pole ear portion 232 includes a gathered portion 234 formed by stacking and connecting multiple layers of pole ear sheets 233, and the conductive member 261 includes a first connecting segment 2611, and the gathered portion 234 is stacked on one side of the first connecting segment 2611 in the thickness direction and connected to the first connecting segment 2611.

[0197] Among them, the first connecting section 2611 is in the form of a plate, and the thickness direction of the first connecting section 2611 is consistent with that of the gathering portion 234. The two are overlapped along the thickness direction of the first connecting section 2611, so that the matching mode between the gathering portion 234 and the conductive member 261 is simple, which is conducive to improving production efficiency.

[0198] According to some embodiments of the present application, the surface of one end of the pole body 251 facing the battery core component 23 is the inner end face 2511 of the pole body, and the first connecting section 2611 is supported on the side of the retracted portion 234 away from the pole body 251, so that the retracted portion 234 is sandwiched between the inner end face 2511 of the pole body and the first connecting section 2611. Thus, the redundancy of the pole ear portion 232 can be improved by supporting the retracted portion 234 with the first connecting section 2611, and the risk of short circuit caused by the pole ear portion 232 being inserted into the active material coating portion 231 can be reduced.

[0199] According to some embodiments of the present application, the battery cell 20 further includes a pressure relief device 27 . The pressure relief device 27 is disposed on the housing component 21 and is located on the same side or on the opposite side as the pole component 25 .

[0200] For example, the pressure relief device 27 may be an explosion-proof valve installed on the housing component 21, or may be integrally formed in a thinned area of ​​the housing component 21. Thus, by providing the pressure relief device 27, when the pressure in the housing component 21 exceeds a preset value, the pressure may be released in a directional manner through the pressure relief device 27, thereby improving the safety and reliability of the battery cell 20.

[0201] For example, in combination Fig.15 , Fig.15 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application; the pressure relief device 27 is located on the same side as the pole component 25. Since the pole component 25 is provided on the second shell wall 242, when the pressure relief device 27 is also provided on the second shell wall 242, the pressure relief device 27 is located on the same side as the pole component 25. Thus, the design of other shell walls other than the second shell wall 242 can be simplified, and the structure and processing of the battery cell 20 can be simplified.

[0202] For example, in combination Fig.10 , Fig.10 A top view of a battery cell provided in some embodiments of the present application; the pressure relief device 27 and the pole component 25 are located on different sides. Since the pole component 25 is provided on the second shell wall 242, when the pressure relief device 27 is also provided on other walls of the housing component 21 except the second shell wall 242, for example, the pressure relief device 27 is provided on the cover plate 22, then the pressure relief device 27 and the pole component 25 are located on different sides. Therefore, there is no need to consider that the pressure relief device 27 occupies the space of the second shell wall 242 and reduces the volume of the pole component 25, so that the shape and volume of the pole component 25 can be flexibly designed as needed.

[0203] According to some embodiments of this application, please refer to Fig.11 and Fig.13 The pole component 25 includes a pole body 251, a transition structure 252 and an insulating sealing structure 253. The transition structure 252 surrounds the pole body 251 and is connected to the cover plate 22 or the shell body 24. The insulating sealing structure 253 is insulated and sealed between the transition structure 252 and the pole body 251.

[0204] The adapter structure 252 surrounds the entire circumference of the pole body 251 along the circumference of the mounting hole 249, so that the adapter structure 252 can play a role in connecting the pole body 251 and the second shell wall 242 or connecting the pole body 251 and the cover plate 22 in the outer peripheral area of ​​the pole body 251. The insulating sealing structure 253 insulates the adapter structure 252 from the pole body 251, and makes the matching position of the adapter structure 252 and the pole body 251 present a sealed state, so as to isolate the inside and outside of the shell component 21 after the adapter structure 252 is connected to the shell component 21, reduce the risk of the electrolyte in the shell component 21 leaking from the matching position of the adapter structure 252 and the pole body 251 to the outside of the shell component 21, and reduce the risk of liquid or dust outside the shell component 21 entering the shell component 21 from the matching position of the adapter structure 252 and the pole body 251, thereby improving the reliability of the battery cell 20.

[0205] In the above technical solution, since the pole component 25 includes not only the pole body 251 but also the transition structure 252 connected to the shell component 21, and an insulating sealing structure 253 is provided between the transition structure 252 and the pole body 251 to play an insulating and sealing role, when the pole component 25 is installed on the shell component 21 and the transition structure 252 is connected to the shell component 21, there is no need to set a seal between the transition structure 252 and the shell component 21, and there is no need to apply a large sealing pressure to meet the compression degree of the seal there, so that the force on the second shell wall 242 or the cover plate 22 can be reduced, and the shell component 21 can be protected, which is conducive to reducing the wall thickness of the shell component 21 and reducing the material cost. In addition, when the second shell wall 242 is the end of the shell body 24 opposite to the opening, the force on the connection between the first shell wall 243 and the second shell wall 242 can be reduced, and the force on the first shell wall 243 can be reduced, which is conducive to ensuring the reliability of the shell component 21 and reducing the wall thickness and cost of the shell component 21.

[0206] According to some embodiments of this application, please refer to Fig.10 , the transfer structure 252 is formed into a long strip (such as a rectangle or a racetrack) extending along the length direction of the first shell wall 243, and the contour shape of the pole body 251 matches the contour shape of the transfer structure 252 (such as a rectangle or a racetrack). As mentioned above, the battery cell component 23 is connected to the pole component 25 through the conductive part 26. When the contour shape of the pole body 251 is formed into a long strip that matches the contour shape of the transfer structure 252, the area of ​​the pole body 251 is larger, which is conducive to increasing the connection area between the conductive part 26 and the pole body 251, thereby improving the conductive performance.

[0207] In some other embodiments of this application, please refer to Fig.14The transition structure 252 is formed into a long strip (such as a rectangle or a racetrack) extending along the length direction of the first shell wall 243, and the pole body 251 is arranged at the length center of the transition structure 252 and is circular. Therefore, the connection position of the transition structure 252 and the pole body 251 is evenly stressed, and it is easy to control the compression amount of the insulating sealing structure 253, so as to improve the reliability of the sealing cooperation between the two.

[0208] The following describes a battery cell 20 , a battery 100 having the battery cell 20 , and a vehicle 1000 having the battery 100 according to six specific embodiments of the present invention in conjunction with the accompanying drawings.

[0209] Embodiment 1

[0210] You can refer to Figures 3 to 5 As shown, the vehicle includes a battery 100, the battery 100 includes a battery cell 20, the battery cell 20 includes a shell component 21, a pole component 25 and a battery core component 23, the shell component 21 includes a shell body 24, the opposite ends of the shell body 24 respectively form an open end 241 and a first shell wall 243, the first shell wall 243 is provided with a mounting hole 249, at least one side of the shell body 24 adjacent to the first shell wall 243 is a second shell wall 242, a guide portion 244 is provided between the second shell wall 242 and the first shell wall 243, and the guide portion 244 includes a shell body 24 located inside The guide surface 2441 of the first shell wall 243 is gradually increased in the direction in which the open end 241 points to the first shell wall 243. The pole component 25 is installed on the first shell wall 243 and covers the mounting hole 249. The pole component 25 includes a pole body 251 arranged opposite to the mounting hole 249. The battery core component 23 is accommodated in the shell body 24 and includes an electrode assembly 235. The pole tabs 233 of the electrode assembly 235 are connected to form a retracted portion 234, and the retracted portion 234 is connected to the pole body 251. The shell body 24 has a first direction F1 and a second direction F2 parallel to the outer wall surface of the first shell wall 243. The size of the first shell wall 243 in the first direction F1 is larger than the size of the first shell wall 243 in the second direction F2. The shell body 24 is located at both ends of the first direction F1 and the second direction F2 to form a second shell wall 242. In a direction perpendicular to the second shell wall 242 , a dimension D1 of the first shell wall 243 is smaller than a distance D2 between the second shell wall 242 and another opposite shell wall, and the first shell wall 243 is connected to the second shell wall 242 via a guide portion 244 .

[0211] The wall thickness h2 of the guide portion 244 and the wall thickness h3 of the second shell wall 242 are smaller than the wall thickness h1 of the first shell wall 243. The guide portion 244 is provided with an outer side surface 2442 located outside the shell body 24, the outer side surface 2442 is parallel to the guide surface 2441, and the distance between the outer side surface 2442 and the guide surface 2441 is equal to the wall thickness h3 of the second shell wall 242; the guide surface 2441 is constructed as an inclined surface.

[0212] Embodiment 2

[0213] You can refer to Figure 7 As shown, the vehicle includes a battery 100, the battery 100 includes a battery cell 20, the battery cell 20 includes a shell component 21, a pole component 25 and a battery core component 23, the shell component 21 includes a shell body 24, the opposite ends of the shell body 24 respectively form an open end 241 and a first shell wall 243, the first shell wall 243 is provided with a mounting hole 249, at least one side of the shell body 24 adjacent to the first shell wall 243 is a second shell wall 242, a guide portion 244 is provided between the second shell wall 242 and the first shell wall 243, and the guide portion 244 includes a shell body 24 located inside The guide surface 2441 of the first shell wall 243 is gradually increased in the direction in which the open end 241 points to the first shell wall 243. The pole component 25 is installed on the first shell wall 243 and covers the mounting hole 249. The pole component 25 includes a pole body 251 arranged opposite to the mounting hole 249. The battery core component 23 is accommodated in the shell body 24 and includes an electrode assembly 235. The pole tabs 233 of the electrode assembly 235 are connected to form a retracted portion 234, and the retracted portion 234 is connected to the pole body 251. The shell body 24 has a first direction F1 and a second direction F2 parallel to the outer wall surface of the first shell wall 243. The size of the first shell wall 243 in the first direction F1 is larger than the size of the first shell wall 243 in the second direction F2. The shell body 24 is located at both ends of the first direction F1 and the second direction F2 to form a second shell wall 242. In a direction perpendicular to the second shell wall 242 , a dimension D1 of the first shell wall 243 is smaller than a distance D2 between the second shell wall 242 and another opposite shell wall, and the first shell wall 243 is connected to the second shell wall 242 via a guide portion 244 .

[0214] The wall thickness h2 of the guide portion 244 and the wall thickness h3 of the second shell wall 242 are less than the wall thickness h1 of the first shell wall 243. The guide portion 244 is provided with an outer side surface 2442 located outside the shell body 24, and the guide surface 2441 is configured as an arc surface, and the radius of the guide surface 2441 is 7 mm. The guide portion 244 has an outer side surface 2442 located outside the shell body 24, and the outer side surface 2442 is configured as an arc surface. In the direction in which the open end 241 points to the first shell wall 243, the distance between the outer side surface 2442 and the guide surface 2441 gradually increases.

[0215] Embodiment 2

[0216] You can refer to Figures 8 to 9As shown, the vehicle includes a battery 100, the battery 100 includes a battery cell 20, the battery cell 20 includes a shell component 21, a pole component 25 and a battery core component 23, the shell component 21 includes a shell body 24, the opposite ends of the shell body 24 respectively form an open end 241 and a first shell wall 243, the first shell wall 243 is provided with a mounting hole 249, at least one side of the shell body 24 adjacent to the first shell wall 243 is a second shell wall 242, a guide portion 244 is provided between the second shell wall 242 and the first shell wall 243, and the guide portion 244 includes a shell body 24 located inside The guide surface 2441 of the first shell wall 243 is gradually increased in the direction in which the open end 241 points to the first shell wall 243. The pole component 25 is installed on the first shell wall 243 and covers the mounting hole 249. The pole component 25 includes a pole body 251 arranged opposite to the mounting hole 249. The battery core component 23 is accommodated in the shell body 24 and includes an electrode assembly 235. The pole tabs 233 of the electrode assembly 235 are connected to form a retracted portion 234, and the retracted portion 234 is connected to the pole body 251. The shell body 24 has a first direction F1 and a second direction F2 parallel to the outer wall surface of the first shell wall 243. The size of the first shell wall 243 in the first direction F1 is larger than the size of the first shell wall 243 in the second direction F2. The shell body 24 is located at both ends of the first direction F1 and the second direction F2 to form a second shell wall 242. In a direction perpendicular to the second shell wall 242 , a dimension D1 of the first shell wall 243 is smaller than a distance D2 between the second shell wall 242 and another opposite shell wall, and the first shell wall 243 is connected to the second shell wall 242 via a guide portion 244 .

[0217] The guide portion 244 includes two sections, namely a first section 2443 and a second section 2444. In the direction from the second shell wall 242 to the first shell wall 243, the two sections are connected in sequence, and the latter is closer to the mounting hole 249 than the former. The two sections are arranged at an angle, and at least the section of the two sections close to the first shell wall 243 is provided with a guide surface 2441. The first section 2443 is perpendicular to the second shell wall 242, and the second section 2444 is perpendicular to the first section 2443, connected to the first shell wall 243, and provided with a guide surface 2441.

[0218] The embodiment of the present application can solve the problem of the asymmetry between the battery core component 23 and the shell body 24 after being installed in the shell body 24 and the problem of the expansion force pulling the pole ear piece 233, thereby reducing the difficulty of the battery core component 23 entering the shell. The connection part of the first shell wall 243 and the second shell wall 242 is made into a guide slope, and the internal insulating part 238 is adjusted accordingly to achieve the purpose of limiting the battery core component 23 after entering the shell. The connection part of the first shell wall 243 and the second shell wall 242 is changed from the original two-level first shell wall 243 / second shell wall 242 thickness to the three-level first shell wall 243 / guide part 244 / second shell wall 242 thickness to meet the requirements of limiting after entering the shell and improving the strength of the first shell wall 243.

[0219] The width of the first shell wall 243 is reduced, the deflection is small when the pole is pulled and twisted, and the strength of the riveting with the pole component 25 is higher. Alternatively, when the pulling and twisting strength of the pole is met, the thickness of the first shell wall 243 is reduced to increase the energy density and reduce the weight.

[0220] According to some embodiments of the present application, the present application further provides a battery 100 , and the battery 100 includes the battery cell 20 of any of the above embodiments.

[0221] In the above technical solution, when the battery cell 20 is assembled, the assembly difficulty is low. After the battery cell component 23 is installed in the shell component 21, it can be aligned with the shell body 24, reducing the possibility of the pole tab 233 and the pole body 251 being pulled and broken, and the reliability of the battery 100 can be improved.

[0222] According to some embodiments of the present application, the battery 100 includes a box assembly 10, a plurality of battery cells 20 are accommodated in the box assembly 10, the bottom of the box assembly 10 is the box bottom plate, and the shell component 21 includes a cover plate 22 covering the opening of the shell body 24, the opening of the shell body 24 faces the box bottom plate, and the cover plate 22 covers the bottom of the shell body 24; or, the opening of the shell body 24 faces away from the box bottom plate, and the cover plate 22 covers the top of the shell body 24.

[0223] That is to say, illustratively, the cover plate 22 is covered on the bottom of the shell body 24, and the pressure relief device 27 is provided on the cover plate 22; or, the cover plate 22 is covered on the top of the shell body 24, and the pressure relief device 27 is provided on the second shell wall 242 opposite to the cover plate 22. In this way, once a battery cell 20 has thermal runaway, the battery cell 20 can release pressure from the bottom, and the central exhaust channel design can be cancelled, further freeing up space for the battery cell 20, which is conducive to the improvement of the energy density of the battery 100, and can quickly achieve directional pressure relief, and the ejected material can be quickly discharged in a specified direction and through the optimal channel, and it is not easy to spread to the surrounding battery cells. Exemplarily, the cover plate 22 is covered on the top of the shell body 24, the battery cell 20 is in an upright state, and the electrolyte is not easy to leak. Therefore, the orientation of the battery cell 20 and the box assembly 10 can be flexibly set.

[0224] According to some embodiments of the present application, the present application further provides an electric device, which includes the battery cell 20 of any of the above embodiments; or includes the battery 100 of any of the above embodiments. The battery cell 20 or the battery 100 is used to provide electric energy for the electric device.

[0225] In the above technical solution, the electrical device adopts the above-mentioned battery 100 or battery cell 20. When the battery cell 20 is assembled, the assembly difficulty is low. After the battery core component 23 is installed in the shell component 21, it can be aligned with the shell body 24, reducing the possibility of the pole ear 233 and the pole body 251 being pulled and broken, thereby improving the reliability of the battery 100 and helping to improve the performance of the electrical device.

[0226] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0227] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A shell component, comprising a shell body, wherein opposite ends of the shell body respectively form an open end and a first shell wall, the first shell wall is provided with a mounting hole, at least one side of the shell body adjacent to the first shell wall is a second shell wall, a guide portion is provided between the second shell wall and the first shell wall, the guide portion comprises a guide surface located in the shell body, and in a direction from the open end to the first shell wall, a distance between the guide surface and an inner wall surface of the second shell wall gradually increases; A pole component is mounted on the first shell wall and covers the mounting hole, and the pole component includes a pole body arranged opposite to the mounting hole; The battery core component is accommodated in the accommodating cavity of the shell body and connected to the pole body.

2. The battery cell according to claim 1, characterized in that: At least two sides of the shell body adjacent to the first shell wall form the second shell wall.

3. The battery cell according to claim 2, characterized in that: The shell body has a first direction and a second direction parallel to the outer wall surface of the first shell wall. The size of the first shell wall in the first direction is larger than the size of the first shell wall in the second direction. The shell body is located at both ends of the first direction and the second direction to form the second shell wall.

4. The battery cell according to claim 1, characterized in that: In a direction perpendicular to the second shell wall, the size of the first shell wall is smaller than the distance between the second shell wall and another opposite shell wall, and the first shell wall is connected to the second shell wall via the guide portion.

5. The battery cell according to claim 4, characterized in that: The wall thickness of the guide portion and the wall thickness of the second shell wall are smaller than the wall thickness of the first shell wall.

6. The battery cell according to claim 5, characterized in that: The guide surface is configured as an inclined surface.

7. The battery cell according to claim 6, characterized in that: The guide portion is provided with an outer side surface located outside the shell body, and the outer side surface is parallel to the guide surface.

8. The battery cell according to claim 7, characterized in that: The distance between the outer side surface and the guide surface is equal to the wall thickness of the second shell wall.

9. The battery cell according to claim 5, characterized in that: The guide surface is configured as an arc surface, and a radius of the guide surface is R, wherein 5 mm ≤ R ≤ 9 mm.

10. The battery cell according to claim 9, characterized in that: The guide portion has an outer side surface located outside the shell body, and the outer side surface is configured as an arc surface.

11. The battery cell according to claim 10, characterized in that: In a direction in which the open end points toward the first shell wall, a distance between the outer side surface and the guide surface gradually increases.

12. The battery cell according to claim 11, characterized in that: The minimum distance between the outer side surface and the guide surface is equal to the wall thickness of the second shell wall.

13. The battery cell according to any one of claims 4 to 12, characterized in that: The guide portion includes at least two sections. In the direction from the second shell wall to the first shell wall, at least two of the sections are connected in sequence, and the latter is closer to the mounting hole than the former. Any two adjacent sections are arranged at an angle, and at least the section of at least two sections that is close to the first shell wall is provided with the guide surface.

14. The battery cell according to claim 13, characterized in that: There are two sections, namely a first section and a second section. The first section is perpendicular to the second shell wall, and the second section is perpendicular to the first section and connected to the first shell wall and is provided with the guide surface.

15. The battery cell according to claim 14, characterized in that: A first transition angle is provided between the first section and the second shell wall, and a second transition angle is provided between the second section and the first section.

16. The battery cell according to claim 1, characterized in that: The surface of one end of the pole body facing the electric core component is the inner end surface of the pole body, and the electric core component is connected to the inner end surface of the pole body through the conductive part.

17. The battery cell according to claim 16, characterized in that: The battery core component includes an active material coating portion accommodated in the accommodating cavity, and a pole ear portion connected to the active material coating portion, the pole ear portion includes a gathered portion formed by stacking and connecting multiple layers of pole ear sheets, and at least a portion of the gathered portion is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body.

18. The battery cell according to claim 1, characterized in that: The battery core component includes an active material coating portion accommodated in the accommodation cavity, and a pole ear portion connected to the active material coating portion, and the pole ear portion is connected to the pole body through a conductive member.

19. The battery cell according to claim 18, characterized in that: The conductive member includes a first connecting section, the first connecting section includes two clamping parts, the pole lug portion includes a pole lug end portion, the pole lug end portion is clamped between the two clamping parts and connected to the clamping parts.

20. The battery cell according to claim 19, characterized in that: The surface of one end of the pole body facing the battery core component is the inner end face of the pole body, and the conductive member includes a second connecting segment, which is laid on the inner end face of the pole body and connected to the inner end face of the pole body, and the conductive member is bent at the connecting position between the first connecting segment and the second connecting segment so that the first connecting segment is located on the side of the second connecting segment away from the pole body, and one of the clamping portions is supported on the side of the pole ear end away from the pole body.

21. The battery cell according to claim 20, characterized in that: The pole lug portion includes a gathered portion formed by stacking and connecting a plurality of pole lug sheets, and the gathered portion is stacked on one side of the first connecting section in a thickness direction and connected to the first connecting section.

22. The battery cell according to claim 21, characterized in that: The first connecting section is supported on a side of the gathered portion away from the pole body, so that the gathered portion is sandwiched between the inner end surface of the pole body and the first connecting section.

23. The battery cell according to claim 1, 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.

24. The battery cell according to claim 1, characterized in that The pole component comprises a pole body, a transition structure and an insulating sealing structure. The transition structure surrounds the pole body and is connected to the first shell wall. The insulating sealing structure is insulated and sealed between the transition structure and the pole body.

25. The battery cell according to claim 24, characterized in that: The transition structure is formed into a long strip extending along the length direction of the first shell wall, and the contour shape of the pole body matches the contour shape of the transition structure; Alternatively, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged at the length center position of the transition structure and is circular.

26. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 25.

27. The battery according to claim 26, characterized in that The battery includes a box assembly, the battery cells are multiple and accommodated in the box assembly, the bottom of the box assembly is a box bottom plate, and the shell component includes a cover plate covering the opening of the shell body, the opening of the shell body faces the box bottom plate, and the cover plate is covered on the bottom of the shell body; or, the opening of the shell body faces away from the box bottom plate, and the cover plate is covered on the top of the shell body.

28. An electrical device, characterized in that: Comprising the battery cell according to any one of claims 1 to 25, or the battery according to claim 26 or 27.

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