WO2024083016A1

WO2024083016A1 - Shell assembly, battery cell, battery and electric device

Info

Publication number: WO2024083016A1
Application number: PCT/CN2023/124060
Authority: WO
Inventors: 吴宁生; 周文林; 白璐璐; 谢勇锋; 柯海波; 李全坤; 杨道伟
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-10-18
Filing date: 2023-10-11
Publication date: 2024-04-25
Also published as: CN218274993U

Abstract

A shell assembly (21), a battery cell (20), a battery (100) and an electric device. The shell assembly (21) comprises: a shell (211), which is provided with an electrode lead-out hole (2111); and an electric connector (212), which is mounted to the electrode lead-out hole (2111) in a penetrating manner. The electric connector (212) is connected to a tab (231). A guide structure (2120) is provided at the connection between the electric connector (212) and the tab (231), and the guide structure (2120) guides the tab (231) toward an inner wall of the shell (211).

Description

Shell assembly, battery cell, battery and electrical device

Priority information

This application claims priority and benefits of patent application No. 202222731617.3 filed with the State Intellectual Property Office of China on October 18, 2022, and the entire text of which is incorporated herein by reference.

Technical Field

The present application relates to the field of battery technology, and in particular to a housing assembly, a battery cell, a battery and an electrical device.

Background technique

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

The tab is a component in the battery used to output electrical energy from the electrode assembly. One end of the tab is connected to the electrode assembly, and the other end is welded to the electrical connector. The existing welding surface between the tab and the electrical connector will squeeze the tab during the tab retraction process, occupying the height space for the tab shaping, resulting in the risk of the tab being squeezed and inserted upside down into the electrode assembly.

Summary of the invention

In view of the above problems, the present application provides a shell assembly, a battery cell, a battery and an electrical device, which can alleviate the problem that during the process of retracting the pole ear, the welding surface between the pole ear and the electrical connector squeezes the pole ear, occupies the height space for shaping the pole ear, and causes the pole ear to be squeezed and inserted upside down into the electrode assembly.

In a first aspect, the present application provides a housing assembly, comprising a housing and an electrical connector. The housing is provided with an electrode lead-out hole. The electrical connector is installed through the electrode lead-out hole and is used to connect with a pole lug to output electrical energy. A guide structure is provided at the connection between the electrical connector and the pole lug, and the guide structure is used to guide the pole lug toward the inner wall of the housing.

In the technical solution of the embodiment of the present application, a guide structure is provided at the connection between the electrical connector of the shell assembly and the pole ear. Compared with the electrical connector without the guide structure, the setting of the guide structure can provide a guide for the folding of the pole ear, which is conducive to the extension of the pole ear in the direction close to the inner wall of the shell, thereby making the folding state of the pole ear better. When the number and size of the pole ears are the same, the height space required for the pole ear shaping is smaller, thereby avoiding the problem that the welding surface between the electrical connector and the pole ear squeezes the pole ear, causing the pole ear to be inserted into the electrode assembly invertedly and cause the pole ear and the electrode assembly to short-circuit, thereby effectively reducing the risk of short circuit of the battery cell and the battery, and improving the safety performance of the battery cell and the battery. In addition, the height space occupied by the pole ear shaping of the electrical connector with a guide structure is smaller. When the size of the battery cell is fixed, the pole piece in the electrode assembly has more design space in the battery cell, thereby improving the energy density of the battery cell.

In some embodiments, the electrical connector includes a pole, the pole passes through the electrode lead-out hole, the pole includes a direction of a central axis of the electrode lead-out hole, and the guide structure is arranged at the bottom of the pole. The guide structure is arranged at the bottom of the pole, which can facilitate the installation and cooperation between the tab and the guide structure, improve the guiding effect of the guide structure on the tab folding, and reduce the design difficulty of the guide structure, thereby simplifying the production of the pole.

In some embodiments, a cut angle is formed from the end surface of the bottom of the pole to the side surface, the guide structure includes an inclined surface at the cut angle, and the pole lug is welded to the inclined surface.

The end face of the bottom of the pole is cut to the side face, so that the weight of the shell assembly can be reduced, and the weight of the battery cell and the battery can be reduced. Therefore, when the electric device uses the battery in the embodiment of the present application, the weight of the electric device can be reduced to a certain extent, and the electric device can be made lighter. At the same time, the guide structure includes an inclined surface at the cut corner, so that the pole ear can extend in the direction close to the inner wall of the shell along the inclined surface, optimize the retracted state of the pole ear, avoid the end face of the bottom of the pole column squeezing the pole ear during the retracting process of the pole ear, resulting in the pole ear being inserted into the electrode assembly in reverse, causing the pole ear and the electrode assembly to short-circuit, prevent the battery cell and the battery from short-circuiting, and improve the safety performance of the battery cell and the battery.

In addition, the pole ear is connected to the inclined surface at the cut corner by welding, which can increase the flow area between the pole and the pole ear, reduce temperature rise, improve the safety performance of the battery cell and the battery, and meet the performance requirements of the fast-charging electrode assembly for power transmission. On the other hand, it can enhance the connection strength between the pole and the pole ear, and the two are not easy to separate, which improves the stability of the battery cell. At the same time, the setting of the cut angle can increase the welding area between the pole ear and the pole, which not only facilitates the welding between the pole ear and the pole, improves the assembly efficiency of the battery cell, but also improves the stability of the connection between the pole ear and the pole, ensuring the normal operation of the battery cell.

In some embodiments, in the extension direction of the end surface of the bottom of the pole, the guide structure is provided on opposite sides of the bottom of the pole, and the pole satisfies the following relationship: 0＜L1＜L/2, wherein L1 is the vertical distance from the starting point of the cut angle to the side surface of the bottom, and L is the total length of the bottom of the pole in the extension direction of the end surface of the bottom of the pole.

Guide structures are provided on opposite sides of the bottom of the pole to guide the tabs to close in the direction close to the inner wall of the shell, thereby further optimizing the tab folding state, reducing the height space required for tab shaping, and avoiding the problem that the tabs are squeezed by the welding surface between the pole and the tabs, causing the tabs to be inserted into the electrode assembly upside down and causing the tabs and the electrode assembly to short-circuit. At the same time, guide structures are provided on opposite sides of the bottom of the pole to ensure the connection strength between the tabs and the guide structures, prevent the two from being separated, and thus improve the working stability of the battery.

In addition, the vertical distance from the starting point of the cut angle to the side of the bottom cannot be too large. When the vertical distance from the starting point of the cut angle to the side of the bottom exceeds half of the total length of the bottom of the pole in the extension direction of the end face of the bottom of the pole, the inclined surface at the cut angle will form a sharp angle, thereby cutting the gathered pole ear. In the embodiment of the present application, the pole satisfies the following relationship: 0＜L1＜L/2. Therefore, the inclined surface at the cut angle formed from the end face of the bottom of the pole to the side will not have a sharp angle, thereby avoiding the gathered pole ear from being cut, ensuring the performance of the battery cell and the battery. At the same time, when the pole satisfies the following relationship: 0＜L1＜L/2, it can avoid the thickness of the bottom of the pole in the direction of the central axis of the electrode lead-out hole being too large, resulting in occupying more height space for the shaping of the pole ear, ensuring that the pole piece in the electrode assembly has more design space in the battery cell, and improving the energy density of the battery cell.

In some embodiments, the pole satisfies the following relationship: T-T1≥0.2mm, wherein T is the total thickness of the bottom of the pole in the direction of the central axis of the electrode lead-out hole, and T1 is the thickness of the outer side of the bottom of the pole in the direction of the central axis of the electrode lead-out hole after the cut angle is formed.

When the pole meets the following relationship: T-T1 ≥ 0.2mm, there can be a height difference at the bottom of the pole, ensuring the guiding effect of the guide structure on the tab folding, optimizing the tab shaping, reducing the height space occupied by the tab shaping, and improving the energy density of the battery cell. At the same time, T-T1 ≥ 0.2mm can meet the reasonable step difference and simplify the manufacturing process of the pole.

In some embodiments, a chamfer is formed from the end surface of the bottom of the pole to the side surface, the guide structure includes an arc surface of the chamfer, and the pole lug is welded to the end surface of the bottom of the pole.

The rounded arc surface not only helps the pole ear to extend toward the inner wall of the shell, optimizes the retracted state of the pole ear, reduces the height space occupied by the pole ear shaping, and improves the energy density of the battery cell, but also avoids the edges and corners between the end face and the side of the bottom of the pole from cutting the shaped pole ear, thereby ensuring the performance of the battery cell and the battery.

In some embodiments, the radius of the rounded corner is greater than or equal to 0.2 mm.

Compared with the rounded corner radius less than 0.2mm, the rounded corner radius greater than or equal to 0.2mm can make the bottom of the pole have a height difference, ensure that the guide structure has a good guiding effect on the folding of the pole ear, optimize the shaping of the pole ear, and reduce the height space occupied by the shaping of the pole ear. At the same time, it can also prevent the edges and corners between the end face and the side of the bottom of the pole from cutting the folded pole ear, ensuring the performance of the battery cell and the battery.

In some embodiments, the electrical connector includes a pole and an adapter plate, the pole passes through the electrode lead-out hole, the pole includes a top and a bottom located on opposite sides of the shell, the adapter plate is connected to the bottom of the pole, and the guide structure is arranged on the adapter plate.

The guide structure is arranged on the adapter, which can facilitate the installation and coordination of the tab and the guide structure, and improve the guiding effect of the guide structure on the tab folding. On the other hand, it can reduce the design difficulty of the guide structure, thereby simplifying the production of the adapter. In addition, the adapter can be fused in the case of short circuit, overcharge or overdischarge of the electrode assembly, thereby interrupting the current transmission between the pole column and the tab, avoiding The battery will not be damaged or other components will be burned in case of short circuit, overcharge or over discharge, thus ensuring the safety performance of battery cells and batteries.

In some embodiments, the adapter plate includes a first sub-portion and a second sub-portion, the first sub-portion is connected to the bottom of the pole, the second sub-portion extends obliquely from the side edge of the first sub-portion toward the direction close to the inner wall of the shell, the surface of the second sub-portion facing away from the pole is a slope, the guide structure includes the slope, and the pole ear is welded to the slope.

The second sub-section extends obliquely from the side edge of the first sub-section toward the direction close to the inner wall of the shell, thereby reducing the height space occupied by the adapter for shaping the pole ear. When the size of the battery cell is fixed, the pole piece in the electrode assembly has more design space in the battery cell, thereby improving the energy density of the battery cell. At the same time, the guide structure includes an inclined surface of the second sub-section that is away from the pole column, so that the pole ear can extend along the inclined surface toward the inner wall of the shell, optimize the folded state of the pole ear, reduce the height space occupied by the shaping of the pole ear, avoid the adapter from squeezing the pole ear during the folding process of the pole ear, resulting in the pole ear being inserted into the electrode assembly in reverse, causing the pole ear and the electrode assembly to short-circuit, prevent the battery cell and the battery from short-circuiting, and improve the safety performance of the battery cell and the battery.

In addition, the pole ear is connected to the inclined surface of the second sub-unit away from the pole column by welding. On the one hand, it can increase the flow area between the adapter and the pole ear, reduce temperature rise, improve the safety performance of the battery cell and the battery, and meet the performance requirements of the fast-charging electrode assembly for power transmission. On the other hand, it can enhance the connection strength between the adapter and the pole ear, and the two are not easy to separate, which improves the stability of the battery cell. At the same time, the setting of the inclined surface can increase the welding area between the pole ear and the adapter, which not only facilitates the welding between the pole ear and the adapter, improves the assembly efficiency of the battery cell, but also improves the stability of the connection between the pole ear and the adapter, and ensures the normal operation of the battery cell.

In some embodiments, the adapter plate is provided with the guide structure on both opposite sides in the direction close to the inner wall of the shell, and the adapter plate satisfies the following relationship: 0＜D1＜D/2, wherein D1 is the vertical distance from the starting point of the inclination of the second sub-portion to the side of the adapter plate, and D is the total length of the adapter plate in the extension direction of the end face at the bottom of the pole.

The adapter is provided with guide structures on both sides to guide the tabs to close in the direction close to the inner wall of the shell, thereby further optimizing the tab closing state, reducing the height space required for tab shaping, and avoiding the problem that the tabs are squeezed by the welding surface between the adapter and the tabs, causing the tabs to be inserted into the electrode assembly upside down and causing the tabs and the electrode assembly to short-circuit. At the same time, the adapter is provided with guide structures on both sides to ensure the connection strength between the tabs and the guide structures, prevent the two from being separated, and thus improve the working stability of the battery.

In addition, the vertical distance from the starting point of the second sub-part inclination to the side of the adapter sheet cannot be too large. When the vertical distance from the starting point of the second sub-part inclination to the side of the adapter sheet exceeds half of the total length of the adapter sheet in the extension direction of the end face of the bottom of the pole, the inclined surface of the second sub-part away from the pole will form a sharp corner, thereby cutting the gathered pole ear. In the embodiment of the present application, the adapter sheet satisfies the following relationship: 0＜D1＜D/2. Therefore, the inclined surface of the second sub-part away from the pole will not have a sharp corner, thereby avoiding cutting the gathered pole ear and ensuring the performance of the battery cell and the battery. At the same time, when the adapter sheet satisfies the following relationship: 0＜D1＜D/2, it can avoid that the thickness of the adapter sheet in the direction of the central axis of the electrode lead-out hole is too large, resulting in occupying more height space for the shaping of the pole ear, ensuring that the pole sheet in the electrode assembly has more design space in the battery cell, and improving the energy density of the battery cell.

In some embodiments, the adapter satisfies the following relationship: h-t≥0.2mm, wherein h is the vertical distance between the farthest point at which the second sub-section is inclined relative to the first sub-section and the outermost side of the first sub-section in the direction of the central axis of the electrode lead-out hole, and t is the thickness of the adapter in the direction of the central axis of the electrode lead-out hole.

When the adapter sheet satisfies the following relationship: T-T1≥0.2mm, there can be a height difference between the side of the adapter sheet and the starting point of the second sub-section inclination, ensuring the guiding effect of the guide structure on the tab folding, optimizing the tab shaping, reducing the height space occupied by the tab shaping, and improving the energy density of the battery cell. At the same time, T-T1≥0.2mm can meet the reasonable step difference and simplify the manufacturing process of the adapter sheet.

In some embodiments, the adapter plate includes a side surface and an end surface, the end surface is the surface of the adapter plate facing away from the pole, the side surface of the adapter plate is connected to the end surface of the adapter plate, a chamfer is formed from the end surface of the adapter plate to the side surface of the adapter plate, the guide structure includes the rounded arc surface, and the pole ear is welded to the end surface of the adapter plate.

The rounded arc surface is not only conducive to extending the pole ear close to the inner wall of the shell, optimizing the retracted state of the pole ear, reducing the height space occupied by the pole ear shaping, and improving the energy density of the battery cell, but also can prevent the corners between the end face of the adapter facing away from the pole and the side face from cutting the shaped pole ear, thereby ensuring the performance of the battery cell and the battery.

Compared with the rounded corner radius less than 0.2mm, the rounded corner radius greater than or equal to 0.2mm can make the adapter have a height difference, ensure that the guide structure has a better guiding effect on the folding of the pole ear, optimize the shaping of the pole ear, and reduce the height space occupied by the shaping of the pole ear. At the same time, it can also prevent the corners between the end face of the adapter away from the pole and the side face from cutting the shaped pole ear, ensuring the performance of the battery cell and the battery.

In some embodiments, the housing includes an outer side and an inner side opposite to each other, the top of the pole of the electrical connector is located on the outer side of the housing, and the bottom of the pole of the electrical connector is located on the inner side of the housing; the housing assembly further includes a first insulating member, a second insulating member, and a connecting member. The first insulating member is mounted on the outer side of the housing. The second insulating member is mounted on the inner side of the housing. The connecting member is mounted on a side of the first insulating member that is away from the housing, the top of the pole is connected to the connecting member, and the bottom of the pole is in contact with the second insulating member.

The top of the pole is connected to the connector, and the bottom of the pole is connected to the pole ear of the electrode assembly, so that the current of the electrode assembly can be led out to the connector outside the shell through the pole ear and the pole in sequence. The first insulating member is installed on the outside of the shell, and the second insulating member is installed on the inside of the shell, which can insulate the shell, thereby effectively reducing the risk of short circuit of the battery cell and the battery, and improving the safety performance of the battery cell and the battery.

In some embodiments, the housing assembly further includes a seal, which is sleeved on the pole and located in the electrode lead-out hole to seal the gap between the housing and the pole. The seal is interposed between the pole and the housing to fill the matching gap between the housing and the pole to prevent leakage of the electrolyte inside the battery cell.

In a second aspect, the present application provides a battery cell, comprising a shell assembly according to any of the above embodiments.

In the technical solution of the embodiment of the present application, the battery cell uses the shell assembly in the embodiment of the first aspect, and the electrical connector of the shell assembly is provided with a guide structure at the connection of the pole ear to guide the pole ear to extend in the direction close to the inner wall of the shell, optimize the retracted state of the pole ear, thereby avoiding the welding surface between the electrical connector and the pole ear squeezing the pole ear, causing the pole ear to be inserted into the electrode assembly upside down and causing the pole ear and the electrode assembly to short-circuit, thereby effectively reducing the risk of short circuit in the battery cell and improving the safety performance of the battery cell. At the same time, the setting of the guide structure can also reduce the height space occupied by the electrical connector for the shaping of the pole ear. When the size of the battery cell is fixed, the pole piece in the electrode assembly has more design space in the battery cell, thereby improving the energy density of the battery cell.

In some embodiments, the battery cell includes a shell body, an end cover and an electrode assembly. The shell body includes a receiving cavity with an opening. The electrode assembly is arranged in the receiving cavity. The end cover is covered on the opening. Among them, the shell is the shell body or the end cover. The battery cell includes a shell body with a receiving cavity and an end cover covering the opening of the receiving cavity, which can facilitate the assembly of the battery cell on the one hand and the maintenance and replacement of the battery cell when a failure occurs on the other hand. At the same time, the shell is the shell body or the end cover, that is, the electrical connector is arranged on the shell body or the end cover, so as to improve the applicability of the battery cell.

In a third aspect, the present application also provides a battery, comprising a battery cell according to any of the above embodiments.

In the technical solution of the embodiment of the present application, the battery uses the battery cell in the embodiment of the second aspect, and in the shell assembly of the battery cell, the electrical connector of the shell assembly is provided with a guide structure at the connection of the pole ear to guide the pole ear to extend in the direction close to the inner wall of the shell, optimize the retracted state of the pole ear, thereby avoiding the welding surface between the electrical connector and the pole ear squeezing the pole ear, causing the pole ear to be inserted into the electrode assembly upside down and causing the pole ear and the electrode assembly to short-circuit, thereby effectively reducing the risk of short circuit in the battery cell and improving the safety performance of the battery cell. At the same time, the setting of the guide structure can also reduce the height space occupied by the electrical connector for the shaping of the pole ear. When the size of the battery cell is fixed, the pole piece in the electrode assembly has more design space in the battery cell, thereby improving the energy density of the battery cell, and thus also improving the energy density of the battery.

In a fourth aspect, the present application further provides an electrical device, which includes a battery according to any one of the above embodiments, and the battery is used to provide electrical energy.

In the technical solution of the embodiment of the present application, the electric device uses the battery of the embodiment of the third aspect, and in the battery cell of the battery, the electrical connector of the shell assembly is provided with a guide structure at the connection of the pole ear to guide the pole ear to extend in the direction close to the inner wall of the shell, optimize the retracted state of the pole ear, thereby avoiding the welding surface between the electrical connector and the pole ear squeezing the pole ear, causing the pole ear to be inserted into the electrode assembly upside down and cause the pole to be The problem of short circuit between the ear and the electrode assembly is solved, thereby effectively reducing the risk of short circuit in the battery cell and improving the safety performance of the battery cell. At the same time, the setting of the guide structure can also reduce the height space occupied by the electrical connector for shaping the ear. When the size of the battery cell is fixed, the pole piece in the electrode assembly has more design space in the battery cell, which improves the energy density of the battery cell, thereby also improving the energy density of the battery, and then improving the battery life of the electrical device.

The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are listed below.

BRIEF DESCRIPTION OF THE DRAWINGS

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

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

FIG2 is an exploded view of a battery according to some embodiments of the present application;

FIG3 is a schematic diagram of a planar structure of a battery cell according to some embodiments of the present application;

FIG4 is a schematic cross-sectional view of the battery cell shown in FIG3 along line VI-VI;

FIG5 is a schematic diagram of a three-dimensional structure of an electrical connector according to some embodiments of the present application;

FIG6 is a schematic diagram of a planar structure of an electrical connector according to some embodiments of the present application;

FIG7 is a schematic diagram of a planar structure of a battery cell according to some embodiments of the present application;

FIG8 is a schematic cross-sectional view of the battery cell shown in FIG7 along line VIII-VIII;

FIG9 is a schematic diagram of a three-dimensional structure of an electrical connector according to some embodiments of the present application;

FIG10 is a schematic diagram of a planar structure of a battery cell according to some embodiments of the present application;

FIG11 is a schematic cross-sectional view of the housing assembly shown in FIG10 along line XI-XI;

FIG12 is a schematic diagram of the three-dimensional structure of an adapter sheet according to some embodiments of the present application;

FIG13 is a schematic diagram of a planar structure of an adapter sheet according to some embodiments of the present application;

FIG14 is a schematic diagram of a planar structure of a battery cell according to some embodiments of the present application;

FIG15 is a schematic cross-sectional view of the housing assembly shown in FIG14 along line XV-XV;

FIG. 16 is a schematic diagram of the three-dimensional structure of the adapter sheet according to some embodiments of the present application.

Detailed ways

The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

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

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

Reference to an "embodiment" herein 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 related to other embodiments. Mutually exclusive independent or alternative embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.

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

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

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

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.

The inventors have noticed that in the currently common batteries, one end of the pole ear is connected to the electrode assembly, and the other end is connected to the electrical connector by welding, so as to realize the extraction of current. In order to ensure the energy density of the battery cell, the pole piece in the electrode assembly needs to occupy a larger space in the battery cell, so the height space of the pole ear shaping is relatively small. In addition, the electrical connector needs to extend into the battery cell to connect with the pole ear, so as to realize the extraction of current, so the electrical connector will also occupy a certain height space of the pole ear shaping, so that the height space of the pole ear shaping cannot meet the requirements of the pole ear shaping. When the shell, the electrical connector and the pole ear are connected and assembled, the welding surface between the electrical connector and the pole ear squeezes the pole ear, causing the pole ear to be inserted into the electrode assembly in reverse, causing the problem of short circuit between the pole ear and the electrode assembly, thereby causing a short circuit in the battery cell, affecting the safety performance of the battery cell and the battery.

In order to alleviate the problem that the welding surface between the pole ear and the electrical connector squeezes the pole ear during the process of the pole ear folding, occupies the height space of the pole ear shaping, and causes the pole ear to be squeezed and inserted into the electrode assembly, the applicant has found that the pole ear can be guided toward the inner wall of the shell. Compared with the pole ear being completely located between the electrical connector and the electrode assembly, guiding the pole ear toward the inner wall of the shell can optimize the state of the pole ear folding, reduce the height space occupied by the pole ear shaping, and avoid the problem that the welding surface between the electrical connector and the pole ear squeezes the pole ear during the process of the pole ear folding, causing the pole ear to be inserted into the electrode assembly and causing the pole ear and the electrode assembly to short-circuit, thereby effectively reducing the risk of short circuit of the battery cell and the battery, and improving the safety performance of the battery cell and the battery.

Based on the above considerations, in order to guide the pole ear toward the direction close to the inner wall of the shell, the inventor has designed a shell assembly after in-depth research. The connection between the electrical connector of the shell assembly and the pole ear is provided with a guide structure. The guide structure can guide the pole ear toward the direction close to the inner wall of the shell, thereby optimizing the folded state of the pole ear, reducing the height space occupied by the pole ear shaping, and avoiding the pole ear being squeezed by the electrical connector and inserted into the electrode assembly, resulting in the problem of short circuit between the pole ear and the electrode assembly, thereby effectively reducing the risk of short circuit of the battery cell and the battery, and improving the safety performance of the battery cell and the battery. Moreover, the setting of the guide structure can also reduce the height space occupied by the electrical connector for the pole ear shaping. When the size of the battery cell is fixed, the pole piece in the electrode assembly has more design space in the battery cell, which improves the energy density of the battery cell.

The battery cell disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

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

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

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

Please refer to FIG. 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

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

Each battery cell 20 may be a secondary battery 100 or a primary battery 100; it may also be a lithium-sulfur battery 100, a sodium-ion battery 100 or a magnesium-ion battery 100, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes. The battery cell 20 refers to the smallest unit constituting the battery 100. In the present application, the battery cell 20 is described by taking a rectangular battery as an example.

Referring to FIGS. 3 and 4 , the shell assembly 21 of the battery cell 20 of some embodiments of the present application includes a shell 211 and an electrical connector 212. The shell 211 is provided with an electrode lead-out hole 2111. The electrical connector 212 is installed through the electrode lead-out hole 2111 and is used to connect with the pole ear 231 to output electrical energy. A guide structure 2120 is provided at the connection between the electrical connector 212 and the pole ear 231. The guide structure 2120 is used to guide the pole ear 231 toward the inner wall of the shell 211.

The shell 211 refers to a component that can isolate the internal environment of the battery cell 20 from the external environment. The shell 211 can be a rectangular parallelepiped. Optionally, the shell 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the shell 211 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. The material of the shell 211 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

The electrode lead-out hole 2111 refers to a through hole that penetrates the housing 211. The radial dimension (the direction perpendicular to the central axis M0 of the electrode lead-out hole 2111) of the partial structure of the electrical connector 212 is larger than the radial dimension of the electrode lead-out hole 2111, so that the electrical connector 212 can be installed through the electrode lead-out hole 2111. The electrode lead-out hole 2111 can be a constant diameter hole, that is, the radius of the electrode lead-out hole 2111 does not change in the direction of the central axis M0 of the electrode lead-out hole 2111. The electrode lead-out hole 2111 can also be a variable diameter hole, such as a stepped hole. Of course, the electrical connector 212 can be a cylindrical structure of constant diameter, or a columnar structure of variable diameter, such as a stepped shaft. In the present application, the battery cell 20 is a rectangular battery, then the direction of the central axis M0 of the electrode lead-out hole 2111 is the height direction (H) of the shell 211.

The electrical connector 212 can be understood as a component that is electrically connected to the electrode assembly 23 at one end and is configured to be connected to the conductor outside the battery cell 20 at the other end for outputting or inputting electrical energy. Among them, the electrical connector 212 is electrically connected to the pole ear 231 of the electrode assembly 23. The electrical connector 212 needs to be made of a conductive metal material to ensure that it can serve as a good conductor between the pole ear 231 and the external conductor after being connected to the pole ear 231 and the external conductor. The electrical connector 212 used in the embodiment of the present application can be applied to a rectangular battery cell 20, and can also be used for battery cells 20 of other shapes, such as cylindrical battery cells 20. Among them, two electrical connectors 212 can be provided on the housing 211, and correspondingly, the electrode lead-out hole 2111 can also be set to two, and the two electrical connectors 212 are respectively a positive electrode electrical connector and a negative electrode electrical connector, and the positive electrode electrical connector and the negative electrode electrical connector are respectively used to electrically connect to the positive pole ear and the negative pole ear of the electrode assembly 23.

The tab 231 can be understood as a metal conductor that leads the positive and negative electrodes from the electrode assembly 23, or can be understood as the contact point of the positive and negative electrodes of the electrode assembly 23 during charging and discharging. The tab 231 is usually a sheet-like stacked structure, which has multiple layers in the height direction (H) of the shell 211, and is composed of the positive electrode sheet and the negative electrode sheet without active material. The tab can be divided into a positive tab and a negative tab. In the embodiment of the present application, the positive tab and the negative tab are located at one end of the electrode assembly 23. The tab 231 is usually made of copper, aluminum, nickel, copper-plated nickel and other materials. For example, the positive electrode sheet of the electrode assembly 23 uses aluminum (Al) material, and the negative electrode sheet uses copper (Cu) material. The material of the tab 231 led out of the positive electrode sheet is also aluminum, and the material of the tab 231 led out of the negative electrode sheet is copper.

The guide structure 2120 is a component used to guide the tab 231 when it is bent, and is located at the connection between the electrical connector 212 and the tab 231. The tab 231 extends toward the inner wall of the housing 211 under the guidance of the guide structure 2120, thereby optimizing the folding state of the tab 231. In some embodiments, the specific shape of the guide structure 2120 can be a plane, an arc, a step, etc.

In the technical solution of the embodiment of the present application, a guide structure 2120 is provided at the connection between the electrical connector 212 of the shell assembly 21 and the pole ear 231. Compared with the electrical connector 212 without the guide structure 2120, the setting of the guide structure 2120 can provide a guide for the retraction of the pole ear 231, which is conducive to the extension of the pole ear 231 in the direction close to the inner wall of the shell 211, thereby making the retraction state of the pole ear 231 better. When the number and size of the pole ears 231 are the same, the height space required for the pole ear shaping of the pole ear 231 is smaller, thereby avoiding the welding surface between the electrical connector 212 and the pole ear 231 squeezing the pole ear 231, causing the pole ear 231 to be inserted into the electrode assembly 23 upside down, causing the pole ear 231 and the electrode assembly 23 to short-circuit, thereby effectively reducing the risk of short circuit of the battery cell 20 and the battery 100 (as shown in Figure 2), and improving the safety performance of the battery cell 20 and the battery 100. In addition, the height space occupied by the electrical connector 212 provided with the guide structure 2120 for shaping the tab is smaller, and when the size of the battery cell 20 is fixed, the pole piece in the electrode assembly 23 has more design space in the battery cell 20, thereby improving the energy density of the battery cell 20. The height space required for shaping the tab is the space required for shaping the tab in the height direction (H) of the housing 211.

According to some embodiments of the present application, optionally, please refer to Figures 4 and 5, the electrical connector 212 includes a pole 2121, the pole 2121 is penetrated by an electrode lead-out hole 2111, the pole includes a top 21211 on the outside of the shell 211 and a bottom 21213 located on the inside of the shell 211, and the guide structure 2120 is arranged at the bottom 21213 of the pole 2121.

In conjunction with FIG. 5 , the pole 2121 can be understood as a functional component for conducting the current in the electrode assembly 23 to the outside of the battery cell 20 to input or output the electric energy of the battery cell 20. The portion of the pole 2121 that passes through the electrode lead-out hole 2111 of the housing 211 can limit the radial movement of the electrical connector 212 along the electrode lead-out hole 2111. The material of the pole 2121 and the material of the pole lug 231 can be made of the same conductive metal material, or can be made of different conductive metal materials, or at least part of the material of the pole 2121 and the material of the pole lug 231 can be made of the same conductive metal material. For example, if the material of the pole ear 231 is copper, then the material of the connection between the pole ear 231 and the pole ear 231 is also copper, thereby improving the conductivity between the connection between the pole ear 231 and the pole ear 231, and the material of the pole 2121 except the connection with the pole ear 231 can be aluminum. Since aluminum is easier to weld with other metals, it is convenient to connect the pole 2121 with other components, thereby improving assembly efficiency.

The guide structure 2120 is arranged at the bottom 21213 of the pole 2121. On the one hand, it can facilitate the installation and coordination between the pole ear 231 and the guide structure 2120, thereby improving the guiding effect of the guide structure 2120 on the retraction of the pole ear 231. On the other hand, it can reduce the design difficulty of the guide structure 2120, thereby simplifying the production of the pole 2121.

According to some embodiments of the present application, optionally, referring to FIG. 3 to FIG. 5 , a cut angle is formed from the end surface 21215 to the side surface 21217 of the bottom 21213 of the pole 2121 , the guide structure 2120 includes an inclined surface at the cut angle, and the pole ear 231 is welded to the inclined surface.

Welding, also known as fusion, is a process or method of joining metals or other thermoplastic materials by heating, high temperature or high pressure to make atoms or molecules of two or more materials of the same or different types combine and diffuse. The pole ear 231 and the bevel at the cut corner in the embodiment of the present application can be welded by ultrasonic welding, molecular diffusion welding, laser welding and other welding methods. For example, the pole ear 231 and the bevel at the cut corner are welded by ultrasonic welding. Ultrasonic welding is to convert the current into high-frequency electrical energy through an ultrasonic generator, and then convert the high-frequency electrical energy into mechanical motion through a transducer, and finally transmit the mechanical motion to the welding head through a horn, and the welding head transmits the received vibration energy to the interface between the pole ear 231 and the bevel at the cut corner, and the vibration energy is converted into heat energy by friction. The heat energy gathers at the interface between the pole ear 231 and the bevel at the cut corner to make the interface melt quickly, and after a certain pressure is added, the interface between the pole ear 231 and the bevel at the cut corner is fused into one. The same material can be used for the inclined surfaces at the corners of the pole lug 231 and the pole post 2121 to facilitate welding. Welding can make the connection between the pole lug 231 and the pole post 2121 more secure, and during the long-term use of the battery cell 20, the pole lug 231 is not likely to fall off, thereby ensuring the safety of the battery cell 20 and the battery 100 (as shown in FIG. 2 ).

The bottom 21213 of the pole 2121 refers to the portion of the pole 2121 located on the side of the housing 211 facing the electrode assembly 23. The end surface 21215 of the bottom 21213 of the pole 2121 refers to the side of the bottom 21213 of the pole 2121 facing the electrode assembly 23, and the side 21217 of the bottom 21213 of the pole 2121 refers to the side 21217 of the bottom 21213 of the pole 2121 itself (i.e., the side 21217 of the portion of the pole 2121 located on the side of the housing 211 facing the electrode assembly 23).

The corner cutting is a structure formed by cutting off the corner of the part to be processed. In the embodiment of the present application, the corner from the end face 21215 of the bottom 21213 of the pole 2121 to the side face 21217 is cut off to form an inclined surface. In one example, the shape of the inclined surface after the corner cutting can be a plane, so that the pole ear 231 can be retracted along the inclined surface direction, avoiding the end face 21215 of the bottom 21213 of the pole 2121 from squeezing the pole ear 231 during the retraction process of the pole ear 231, causing the pole ear 231 to be inserted into the electrode assembly 23 and short-circuited, thereby preventing the battery cell 20 and the battery 100 (shown in Figure 2) from short-circuiting. In another example, the shape of the inclined surface after the corner cutting can also be a curved surface, so that the inclined surface can not only guide the pole ear 231 to retract along the inclined surface direction, but also avoid cutting the pole ear 231, thereby ensuring the performance of the battery cell 20 and the battery 100.

Please refer to Figures 1, 3, 4 and 5. A cut angle is formed from the end face 21215 to the side face 21217 of the bottom 21213 of the pole 2121, so that the weight of the shell assembly 21 can be reduced, and then the weight of the battery cell 20 and the battery 100 can be reduced. Therefore, when the electrical device 1000 uses the battery 100 in the embodiment of the present application, the weight of the electrical device 1000 can be reduced to a certain extent, thereby achieving the lightweight of the electrical device 1000. At the same time, the guide structure 2120 includes an inclined surface at the cut corner so that the pole ear 231 can extend along the inclined surface in the direction close to the inner wall of the shell 211, thereby optimizing the retracted state of the pole ear 231 and preventing the end surface 21215 of the bottom 21213 of the pole 2121 from squeezing the pole ear 231 during the retraction process of the pole ear 231, causing the pole ear 231 to be inserted upside down into the electrode assembly 23 and causing a short circuit between the pole ear 231 and the electrode assembly 23, thereby preventing the battery cell 20 and the battery 100 from short-circuiting and improving the safety performance of the battery cell 20 and the battery 100.

In addition, the pole ear 231 is connected to the inclined surface at the cut corner by welding, which can increase the flow area between the pole 2121 and the pole ear 231, reduce the temperature rise, improve the safety performance of the battery cell 20 and the battery 100, and meet the performance requirements of the fast-charging electrode assembly for power transmission. On the other hand, it can enhance the connection strength between the pole 2121 and the pole ear 231, and the two are not easy to separate, thereby improving the working stability of the battery cell 20. At the same time, the setting of the cut corner can increase the welding area between the pole ear 231 and the pole 2121, thereby not only facilitating the welding between the pole ear 231 and the pole 2121, improving the assembly efficiency of the battery cell 20, but also improving the stability of the connection between the pole ear 231 and the pole 2121, ensuring the normal operation of the battery cell 20. In other embodiments, the pole lug 231 can be partially welded to the end face 21215 of the bottom 21213 of the pole 2121, and partially welded to the inclined surface, which can also enhance the guiding effect of the guide structure 2120 on the retraction of the pole lug 231, further optimize the shaping of the pole lug 231, and further facilitate the welding process.

According to some embodiments of the present application, optionally, referring to FIGS. 4 to 6 , in the extension direction of the end surface of the bottom 21213 of the pole 2121 Upward, guide structures 2120 are provided on opposite sides of the bottom 21213 of the pole 2121, and the pole 2121 satisfies the following relationship: 0＜L1＜L/2, wherein L1 is the vertical distance from the starting point of the cut angle to the side 21217 of the bottom 21213, and L is the total length of the bottom 21213 of the pole 2121 in the extension direction of the end face of the bottom 21213 of the pole 2121.

In the present application, the battery cell 20 is a rectangular battery, wherein the end face of the bottom 21213 of the pole 2121 extends in the width direction (X) of the shell 211, that is, in the width direction (X) of the shell 211, guide structures 2120 are provided on opposite sides of the bottom 21213 of the pole 2121, and the pole 2121 satisfies the following relationship: 0＜L1＜L/2, wherein L1 is the vertical distance from the starting point of the cut angle to the side 21217 of the bottom 21213, and L is the total length of the bottom 21213 of the pole 2121 in the width direction (X) of the shell 211.

The opposite sides of the bottom 21213 of the pole 2121 are the opposite sides of the bottom 21213 of the pole 2121 in the direction close to the inner wall of the housing 211. In one embodiment, the opposite sides of the bottom 21213 of the pole 2121 are symmetrical about the axis M1 of the pole 2121, so that the guide structure 2120 is symmetrical about the axis M1 of the pole 2121, so that the pole lug 231 can be guided by the guide structure 2120 to converge in the direction close to the inner wall of the housing 211, thereby reducing the problem of interference of the pole lug 231.

The opposite sides of the bottom 21213 of the pole 2121 are provided with guide structures 2120 to guide the pole lug 231 to be folded toward the opposite sides of the direction close to the inner wall of the shell 211, thereby further optimizing the folded state of the pole lug 231, reducing the height space required for shaping the pole lug 231, and avoiding the welding surface between the pole 2121 and the pole lug 231 squeezing the pole lug 231, causing the pole lug 231 to be inserted into the electrode assembly 23 upside down, causing the pole lug 231 and the electrode assembly 23 to be short-circuited. At the same time, the opposite sides of the bottom 21213 of the pole 2121 are provided with guide structures 2120, which can ensure the connection strength between the pole lug 231 and the guide structure 2120, prevent the two from being separated, and thus improve the working stability of the battery 100 (shown in FIG. 2 ).

In addition, the vertical distance from the starting point of the cut angle to the side 21217 of the bottom 21213 cannot be too large. When the vertical distance from the starting point of the cut angle to the side 21217 of the bottom 21213 exceeds half of the total length of the bottom 21213 of the pole 2121 in the width direction (X) of the shell 211, that is, when the pole 2121 satisfies the relationship: L1≥L/2, on the one hand, the inclined surfaces of the cut angles on both sides are directly connected at the symmetry axis M1 and sharp corners are formed, which causes the pole lug 231 to be cut by the sharp corners during the folding process, affecting the overcurrent and temperature rise of the pole lug 231, and further affecting the performance of the battery cell 20 and the battery 100 (as shown in FIG. 2). On the other hand, L1≥L/2 will also cause the bottom 21213 of the pole 2121 to be thicker in the height direction (H) of the shell 211, thereby occupying a larger height space for the pole lug shaping, affecting the energy density of the battery cell 20.

L1 is the vertical distance from the starting point of the cut angle to the side 21217 of the bottom 21213 (i.e., the length of the cut angle in the width direction (X) of the shell 211), and L is the total length of the bottom 21213 of the pole 2121 in the width direction (X) of the shell 211. In the embodiment of the present application, the pole 2121 satisfies the following relationship: 0＜L1＜L/2, so that the inclined surfaces at the cut angle formed by the end surface 21215 of the bottom 21213 of the pole 2121 to the two side surfaces 21217 will not be directly connected to form a sharp angle, thereby avoiding the folded pole ear 231 from being cut, ensuring the performance of the battery cell 20 and the battery 100. In addition, the pole ear 231 can be folded upward along the inclined surface direction of the cut angle, so as to optimize the shaping of the pole ear 231, reduce the height space occupied by the shaping of the pole ear 231, and ensure the energy density of the battery cell 20. At the same time, when the pole 2121 satisfies the following relationship: 0＜L1＜L/2, it can also avoid the bottom 21213 of the pole 2121 being too thick in the height direction (H) of the shell 211, resulting in occupying more height space for the pole ear shaping, thereby ensuring that the pole piece in the electrode assembly 23 has more design space in the battery cell 20, thereby improving the energy density of the battery cell 20.

According to some embodiments of the present application, optionally, referring to Figures 5 and 6, the pole 2121 satisfies the following relationship: T-T1≥0.2mm, wherein T is the total thickness of the bottom 21213 of the pole 2121 in the direction of the central axis M0 of the electrode lead-out hole 2111, and T1 is the thickness of the outer side of the bottom 21213 of the pole 2121 in the direction of the central axis M0 of the electrode lead-out hole 2111 after the cut angle is formed.

T-T1≥0.2mm, that is, the height of the cut angle formed by the bottom 21213 of the pole 2121 in the height direction (H) of the shell 211 is greater than or equal to 0.2mm. For example, the value of T-T1 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, etc. If T-T1＜0.2mm, there is almost no height difference in the cut angle formed by the bottom 21213 of the pole 2121, so that it cannot be guaranteed that the pole ear 231 can extend along the guide structure 2120 toward the inner wall of the shell 211. In the embodiment of the present application, the pole 2121 satisfies the following relationship: T-T1≥0.2mm, so that it can be guaranteed that there is a suitable height difference in the bottom 21213 of the pole 2121, and the guide structure 2120 can be aligned with the pole ear. The guiding effect of the contraction of 215 optimizes the shaping of the pole ear 231, reduces the height space occupied by the shaping of the pole ear 231, and improves the energy density of the battery cell 20. At the same time, T-T1≥0.2mm can make the step difference reasonable and simplify the manufacturing process of the pole 2121.

According to some embodiments of the present application, optionally, referring to Figures 7 to 9, the end surface 21215 to the side surface 21217 of the bottom 21213 of the pole 2121 are chamfered, the guide structure 2120 includes a chamfered arc surface, and the pole ear 231 is welded to the end surface 21215 of the bottom 21213 of the pole 2121.

Chamfering is a process of cutting the edges of a workpiece to be processed into a circular arc surface. The chamfering can be processed by a milling machine, a grinder, a grinding wheel, an angle grinder, etc. In the present application, the edges from the end face 21215 to the side face 21217 of the bottom 21213 of the pole 2121 are processed into chamfers, and the guide structure 2120 is a circular arc surface with chamfered corners.

Please refer to Figures 1, 7, 8 and 9. The rounded arc surface is not only conducive to the extension of the pole ear 231 towards the inner wall of the shell 211, optimizing the retracted state of the pole ear 231, reducing the height space occupied by the pole ear 231 shaping, and improving the energy density of the battery cell 20, but also can avoid the sharp edges between the end face 21215 and the side face 21217 of the bottom 21213 of the pole 2121 to cut the shaped pole ear 231, thereby ensuring the performance of the battery cell 20 and the battery 100.

According to some embodiments of the present application, optionally, referring to FIG. 8 and FIG. 9 , the radius R1 of the rounded corner is greater than or equal to 0.2 mm.

The fillet can be a constant fillet or a variable fillet. The constant fillet is a fillet with a constant radius, and the constant radius value is greater than or equal to 0.2 mm; the variable fillet is a fillet segment with multiple radius values, and the multiple radius values are greater than 0.2 mm.

If the radius R1 of the rounded corner is less than 0.2 mm, there is no height difference in the rounded corner formed by the end face 21215 of the bottom 21213 of the pole 2121 to the side face 21217, and the guiding effect on the pole ear 231 is poor, so that it cannot be ensured that the pole ear 231 can extend in the direction close to the inner wall of the shell 211 along the guide structure 2120. In the embodiment of the present application, when the radius R1 of the rounded corner is greater than or equal to 0.2 mm, it can be ensured that there is a height difference in the rounded corner formed by the end face 21215 of the bottom 21213 of the pole 2121 to the side face 21217, and the arc surface of the rounded corner has a good guiding effect on the pole ear 231, so that the pole ear 231 can be gathered in the direction close to the inner wall of the shell 211 along the guide structure 2120, optimize the shaping of the pole ear 231, reduce the height space occupied by the shaping of the pole ear 231, and improve the energy density of the battery cell 20 and the battery 100 (as shown in FIG. 2). Meanwhile, the radius R1 of the rounded corner is greater than or equal to 0.2 mm to make the step difference reasonable and simplify the manufacturing process of the pole 2121. The setting of the rounded corner can prevent the corners between the end face 21215 and the side face 21217 of the bottom 21213 of the pole 2121 from cutting the shaped pole ear 231, thereby ensuring the performance of the battery cell 20 and the battery 100.

According to some embodiments of the present application, optionally, please refer to Figures 10 to 12, the electrical connector 212 includes a pole 2121 and an adapter 2123, the pole 2121 is penetrated by an electrode lead-out hole 2111, the pole includes a top 21211 and a bottom 21213 located on opposite sides of the shell 211, the adapter 2123 is connected to the bottom 21213 of the pole 2121, and the guide structure 2120 is arranged on the adapter 2123.

The adapter 2123 can be understood as a functional component used to connect the pole 2121 and the pole ear 231 to conduct the current in the electrode assembly 23 to the outside of the battery cell 20 or to the inside of the battery cell 20 to output or input the electric energy of the battery cell 20. The material of the adapter 2123 can be metals such as aluminum and copper, or other conductive materials such as aluminum alloy and copper alloy. The adapter 2123 can be connected to the pole 2121 and the pole ear 231 by welding.

The guide structure 2120 is arranged on the adapter 2123. On the one hand, it can facilitate the installation and matching of the pole ear 215 and the guide structure 2120, and improve the guiding effect of the guide structure 2120 on the folding of the pole ear 215. On the other hand, it can reduce the design difficulty of the guide structure 2120, thereby simplifying the production of the adapter 2123. In addition, the pole ear 231 can be connected to the pole 2121 through the adapter 2123. Compared with the pole ear 231 being directly connected to the pole 2121, the arrangement of the adapter 2123 can make the adapter 2123 melt in the case of short circuit, overcharge or over discharge of the electrode assembly 23, thereby interrupting the current transmission between the pole 2121 and the pole ear 231, avoiding damage to the battery 100 or burning of other components in the case of short circuit or overcharge or over discharge, thereby ensuring the safety performance of the battery cell 20 and the battery 100 (as shown in FIG. 2).

According to some embodiments of the present application, optionally, please refer to Figures 11 to 13, the adapter plate 2123 includes a first sub-portion 21231 and a second sub-portion 21233, the first sub-portion 21231 is connected to the bottom 21213 of the pole 2121, the second sub-portion 21233 extends obliquely from the side edge of the first sub-portion 21231 toward the direction close to the inner wall of the shell 211, the surface of the second sub-portion 21233 facing away from the pole 2121 is a slope, the guide structure 2120 includes a slope, and the pole ear 231 is welded to the slope.

The first sub-portion 21231 may be a portion of the adapter sheet 2123 connected to the pole 2121. In one example, the second sub-portion 21233 is independently provided with the first sub-portion 21231, and the second sub-portion 21233 can extend obliquely from the side edge of the first sub-portion 21231 toward the direction close to the inner wall of the shell 211 to form a guide structure 2120. In another example, the second sub-portion 21233 is integrally provided with the first sub-portion 21231, wherein the first sub-portion 21231 is the portion where the adapter sheet 2123 is connected to the pole 2121, and the second sub-portion 21233 is the portion where the adapter sheet 2123 is not connected to the pole 2121. The second sub-portion 21233 is integrally provided with the first sub-portion 21231, which can facilitate the processing of the adapter sheet 2123, simplify the assembly process of the battery cell 20, and improve the assembly efficiency. There may be two second sub-parts 21233, that is, the adapter sheet 2123 is provided with second sub-parts 21233 on opposite sides of the width direction (X) of the shell 211. The second sub-part 21233 extends obliquely from the side edge of the first sub-part 21231 toward the inner wall of the shell 211, thereby reducing the height space occupied by the adapter sheet 2123 for shaping the pole ear. When the size of the battery cell 20 is fixed, the pole piece in the electrode assembly 23 has more design space in the battery cell 20, thereby improving the energy density of the battery cell 20.

The guide structure 2120 includes an inclined surface of the second sub-portion 21233 that is away from the pole 2121, wherein the specific shape of the inclined surface can be a plane, an arc, a step, etc. The guide structure 2120 includes an inclined surface of the second sub-portion 21233 that is away from the pole 2121, so that the pole lug 231 can extend along the inclined surface direction toward the inner wall of the shell 211, optimize the retracted state of the pole lug 231, reduce the height space occupied by the shaping of the pole lug 231, avoid the adapter 2123 squeezing the pole lug 231 during the retracting process of the pole lug 231, causing the pole lug 231 to be inserted into the electrode assembly 23 in reverse, causing the pole lug 231 to short-circuit with the electrode assembly 23, prevent the battery cell 20 and the battery 100 (as shown in FIG. 2) from short-circuiting, and improve the safety performance of the battery cell 20 and the battery 100.

In addition, the pole ear 231 is connected to the inclined surface of the second sub-section 21233 away from the pole 2121 by welding. On the one hand, it can increase the flow area between the adapter 2123 and the pole ear 231, reduce the temperature rise, improve the safety performance of the battery cell 20 and the battery 100, and meet the performance requirements of the fast-charging electrode assembly for power transmission. On the other hand, it can enhance the connection strength between the adapter 2123 and the pole ear 231, and the two are not easy to separate, thereby improving the working stability of the battery cell 20. At the same time, the setting of the inclined surface can increase the welding area between the pole ear 231 and the adapter 2123, thereby not only facilitating the welding between the pole ear 231 and the adapter 2123, improving the assembly efficiency of the battery cell 20, but also improving the stability of the connection between the pole ear 231 and the adapter 2123, ensuring the normal operation of the battery cell 20 and the battery 100.

According to some embodiments of the present application, optionally, please refer to Figures 11 to 13, the adapter plate 2123 is provided with a guide structure 2120 on both opposite sides of the direction close to the inner wall of the shell 211, and the adapter plate 2123 satisfies the following relationship: 0＜D1＜D/2, wherein D1 is the vertical distance from the starting point of the inclination of the second sub-portion 21233 to the side 21217 of the adapter plate 2123, and D is the total length of the adapter plate 2123 in the extension direction of the end face 21213 of the bottom 21213 of the pole 2121.

The opposite sides of the adapter plate 2123 are the opposite sides of the adapter plate 2123 in the width direction (X) of the housing 211. In one embodiment, the opposite sides of the adapter plate 2123 are symmetrical about the axis M2 of the adapter plate 2123, so that the guide structure 2120 is symmetrical about the axis M2 of the adapter plate 2123, so that the tab 231 can be guided by the guide structure 2120 to converge toward the inner wall of the housing 211, thereby reducing the problem of interference between the tabs 231.

The adapter 2123 is provided with guide structures 2120 on opposite sides to guide the tabs 231 to gather towards the opposite sides close to the inner wall of the housing 211, thereby further optimizing the gathered state of the tabs 231, reducing the height space required for shaping the tabs 231, and avoiding the problem that the welding surface between the adapter 2123 and the tabs 231 squeezes the tabs 231, causing the tabs 231 to be inserted into the electrode assembly 23 upside down and causing the tabs 231 to short-circuit the electrode assembly 23. At the same time, the adapter 2123 is provided with guide structures 2120 on opposite sides to ensure the connection strength between the tabs 231 and the guide structures 2120, and prevent the two from being separated, thereby improving the working stability of the battery 100 (shown in FIG. 2 ).

When the vertical distance from the starting point of the inclination of the second sub-portion 21233 to the side of the adapter sheet 2123 exceeds half of the total length of the adapter sheet 2123 in the width direction (X) of the shell 211, that is, when the adapter sheet 2123 satisfies the relationship: D1≥D/2, on the one hand, the second sub-portion 21233 of the adapter sheet 2123 extends obliquely from the side edge of the first sub-portion 21231 toward the direction close to the inner wall of the shell 211, and directly connects on the symmetry axis M2 to form a sharp corner, thereby causing the pole ear 231 to be cut by the sharp corner during the folding process, affecting the overcurrent and temperature rise of the pole ear 231, and further affecting the performance of the battery cell 20 and the battery 100 (as shown in Figure 2). On the other hand, D1≥D/2 will cause the adapter sheet 2123 to be thicker in the height direction (H) of the shell 211, thereby occupying a larger height space for the pole ear shaping, affecting the energy density of the battery cell 20. Spend.

D1 is the vertical distance from the starting point of the inclination of the second sub-portion 21233 to the side surface 21218 of the adapter plate 2123 (i.e., the length of the second sub-portion 21233 in the width direction (X) of the shell 211), and D is the total length of the adapter plate 2123 in the width direction (X) of the shell 211. In the embodiment of the present application, the adapter plate 2123 satisfies the following relationship: 0＜D1＜D/2, so that the inclined surface formed by the second sub-portion 21233 of the adapter plate 2123 extending obliquely from the side edge of the first sub-portion 21231 toward the direction close to the inner wall of the shell 211 will not be directly connected to form a sharp corner, thereby avoiding the retracted pole ear 231 from being cut, and the pole ear 231 can be retracted upward along the inclined surface, thereby optimizing the retracted state of the pole ear 231, reducing the height space occupied by the shaping of the pole ear 231, and improving the energy density of the battery cell 20. At the same time, when the adapter plate 2123 satisfies the following relationship: 0＜D1＜D/2, it can avoid the adapter plate 2123 being too thick in the height direction (H) of the shell 211, which would cause it to occupy more height space for the pole ear shaping, thereby ensuring that the pole piece in the electrode assembly 23 has more design space in the battery cell 20, thereby improving the energy density of the battery cell 20.

According to some embodiments of the present application, optionally, referring to Figures 12 and 13, the adapter plate 2123 satisfies the following relationship: h-t≥0.2mm, wherein h is the vertical distance between the farthest point of the second sub-portion 21233 inclined relative to the first sub-portion 21231 and the outermost side of the first sub-portion 21231 in the direction of the central axis M0 of the electrode lead-out hole 2111, and t is the thickness of the adapter plate 2123 in the direction of the central axis M0 of the electrode lead-out hole 2111.

h-t≥0.2mm, that is, the thickness of the inclined surface formed by the second sub-section 21233 tilted relative to the first sub-section 21231 in the height direction (H) of the shell 211 is greater than or equal to 0.2mm, for example, the value of h-t can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, etc. If h-t＜0.2mm, there is almost no height difference in the inclined surface formed by the second sub-section 21233 tilted relative to the first sub-section 21231, so that it cannot be ensured that the tab 231 can extend along the guide structure 2120 toward the inner wall of the shell 211. In the embodiment of the present application, when the adapter plate 2123 satisfies the following relationship: h-t≥0.2mm, there can be a suitable height difference between the side of the adapter plate 2123 and the starting point of the inclination of the second sub-portion 21233, thereby ensuring the guiding effect of the guide structure 2120 on the retraction of the pole ear 215, optimizing the shaping of the pole ear 231, reducing the height space occupied by the shaping of the pole ear 231, and improving the energy density of the battery cell 20.

According to some embodiments of the present application, optionally, please refer to Figures 14 to 16, the adapter 2123 includes a side surface 21217 and an end surface 21215, the end surface 21215 is the surface of the adapter 2123 facing away from the pole 2121, the side surface 21217 of the adapter 2123 is connected to the end surface 21215 of the adapter 2123, the end surface 21215 of the adapter 2123 and the side surface 21217 of the adapter 2123 form a chamfered corner, the guide structure 2120 includes a rounded arc surface, and the pole ear 231 is welded to the end surface 21215 of the adapter 2123.

Chamfering is a process of cutting the edges of a workpiece to be processed into a circular arc surface. The chamfering can be processed by a milling machine, a grinder, a grinding wheel, an angle grinder, etc. In the present application, by processing the edges of the side 21217 into chamfers, the guide structure 2120 is a circular arc surface with chamfers.

The rounded arc surface is not only conducive to the extension of the pole ear 231 toward the inner wall of the shell 211, optimizing the retracted state of the pole ear 231, reducing the height space occupied by the shaping of the pole ear 231, and improving the energy density of the battery cell 20, but also can prevent the sharp edges of the adapter 2123 between the end face 21215 and the side face 21217 facing away from the pole 2121 from cutting the shaped pole ear 231, thereby ensuring the performance of the battery cell 20 and the battery 100 (as shown in Figure 2).

According to some embodiments of the present application, optionally, referring to FIG. 15 , the radius R2 of the rounded corner is greater than or equal to 0.2 mm.

The fillet can be a constant fillet or a variable fillet. The constant fillet is a fillet with a constant radius, and the constant radius value is greater than or equal to 0.2 mm; the variable fillet is a fillet with multiple radius values, and the multiple radius values are greater than 0.2 mm.

If the radius R2 of the rounded corner is less than 0.2mm, there will be no height difference in the rounded corner on the adapter 2123, and the guiding effect on the pole ear 231 will be poor, so that it cannot be guaranteed that the pole ear 231 can extend along the guide structure 2120 toward the inner wall of the shell 211. In the embodiment of the present application, when the radius R2 of the rounded corner is greater than or equal to 0.2mm, it can be ensured that there is a height difference in the adapter 2123, and the arc of the rounded corner has a better guiding effect on the contraction of the pole ear 231, so that the pole ear 231 can extend along the guide structure 2120 toward the inner wall of the shell 211, optimize the shaping of the pole ear 231, reduce the height space occupied by the shaping of the pole ear 231, and improve the energy density of the battery cell 20. At the same time, the radius R2 of the rounded corner is greater than or equal to 0.2mm, which makes the step difference reasonable and can simplify the manufacturing process of the adapter 2123. In addition, the rounded corner The setting of the angle can also prevent the edge of the adapter 2123 from cutting the shaped pole lug 231 from the end face 21215 to the side face 21217 away from the pole 2121, thereby ensuring the performance of the battery cell 20 and the battery 100 (as shown in FIG. 2 ).

According to some embodiments of the present application, optionally, referring to FIG. 4, FIG. 8, FIG. 11 and FIG. 15, the housing 211 includes an outer side 2113 and an inner side 2115 opposite to each other, the top 21211 of the pole 2121 is located on the outer side 2113 of the housing 211, and the bottom 21213 of the pole 2121 is located on the inner side 2115 of the housing 211; the housing assembly 21 also includes a first insulating member 213, a second insulating member 214 and a connecting member 215. The first insulating member 213 is installed on the outer side 2113 of the housing 211. The second insulating member 214 is installed on the inner side 2115 of the housing 211. The connecting member 215 is installed on the side of the first insulating member 213 away from the housing 211, the top 21211 of the pole 2121 is connected to the connecting member 215, and the bottom 21213 of the pole 2121 is in conflict with the second insulating member 214.

The outer side 2113 of the shell 211 is the side facing away from the inside of the shell 23, and the inner side 2115 of the shell 211 is the side facing the inside of the shell 23. The pole 2121 is disposed in the shell 211, and the top 21211 of the pole 2121 is located on the outer side 2113 of the shell 211, and the bottom 21213 of the pole 2121 is located on the inner side 2115 of the shell 211.

The connector 215 is a component on the housing 211 for connecting one end of the pole 2121, and the connector 215 can be made of aluminum. The connector 215 can be connected to the pole 2121 by circumferentially covering the outer periphery of the pole 2121. In other embodiments, the connector 215 can also be connected to the pole 2121 in other ways. For example, the connector 215 includes two clamping parts arranged opposite to each other, and the two clamping parts are respectively clamped on both sides of the pole 2121 in the radial direction (perpendicular to the height direction (H) of the housing 211), so as to achieve the connection between the connector 215 and the pole 2121. Of course, the connector 215 can also be connected to the pole 2121 in a non-clamping manner. For example, the connector 215 is connected and fixed to the pole 2121 by screws, bolts, pins, etc.

The first insulating member 213 and the second insulating member 214 are components provided on the housing 211 to perform an electrical insulation function. The first insulating member 213 and the second insulating member 214 are both made of insulating materials, such as plastic, rubber, etc. The first insulating member 213 is located on the outer side 2113 of the housing 211, and is used to carry the connecting member 215, so that the connecting member 215 is electrically insulated from the housing 211. The second insulating member 214 is located on the inner side 2115 of the housing 211, and is used to accommodate the bottom of the electrical connecting member 212, so that the electrical connecting member 212 is electrically insulated from the housing 211. The provision of the first insulating member 213 and the second insulating member 214 can reduce the risk of short circuit.

The top 21211 of the pole 2121 is connected to the connector 215, and the bottom 21213 of the pole 2121 is connected to the pole ear 231 of the electrode assembly 23, so that the current of the electrode assembly 23 can be sequentially conducted through the pole ear 231 and the pole 2121 to the connector 215 on the outer side 2113 of the shell 211. The first insulating member 213 is installed on the outer side 2113 of the shell 211, and the second insulating member 214 is installed on the inner side 2115 of the shell 211, so that the shell 211 is insulated, thereby effectively reducing the risk of short circuit of the battery cell 20 and the battery 100 (as shown in FIG. 2), and improving the safety performance of the battery cell 20 and the battery 100.

According to some embodiments of the present application, optionally, referring to FIG. 4, FIG. 8, FIG. 11 and FIG. 15, the housing assembly 21 may further include a seal 216, which is sleeved on the pole 2121 and located in the electrode lead-out hole 2111, and is used to seal the gap between the housing 211 and the pole 2121. The seal 216 is located between the pole 2121 and the housing 211 to fill the matching gap between the housing 211 and the pole 2121, so as to prevent the electrolyte inside the battery cell 20 from leaking out.

The seal 216 is a functional component used to seal to prevent the electrolyte in the battery cell 20 from leaking out. The material of the seal 216 can be an elastic material such as rubber, for example, polyurethane rubber, acrylic rubber, silicone rubber, etc. The shape of the seal 216 can be a circular ring, a square ring, etc., and it only needs to match the shape of the outer peripheral wall of the electrical connector 212 and be able to pass through the gap between the shell 211 and the electrical connector 212. The seal 216 is interposed between the electrical connector 212 and the shell 211 to fill the gap, which can prevent the electrolyte inside the battery cell 20 from leaking out.

In a second aspect, please refer to FIG. 3 , FIG. 7 , FIG. 10 and FIG. 14 , the present application provides a battery cell 20 , including a housing assembly 21 of any of the above embodiments.

In conjunction with FIGS. 4, 8, 11 and 15, in the technical solution of the embodiment of the present application, the battery cell 20 uses the shell assembly 21 in the embodiment of the first aspect, and the connection between the electrical connector 212 in the shell assembly 21 and the pole ear 231 is provided with a guide structure 2120. Compared with the electrical connector 212 without the guide structure 2120, the guide structure 2120 can guide the pole ear 231 toward the inner wall of the shell 211. Direction guidance, thereby preventing the welding surface between the electrical connector 212 and the pole ear 231 from squeezing the pole ear 231, causing the pole ear 231 to be inserted into the electrode assembly 23 upside down, causing the pole ear 231 and the electrode assembly 23 to short-circuit, thereby effectively reducing the risk of short circuits in the battery cell 20 and the battery 100 (as shown in FIG. 2 ), and improving the safety performance of the battery cell 20 and the battery 100. In addition, the provision of the guide structure 2120 can also reduce the height space occupied by the electrical connector 212 for the pole ear shaping. When the size of the battery cell 20 is fixed, the pole piece in the electrode assembly 23 has more design space in the battery cell 20, thereby improving the energy density of the battery cell 20.

According to some embodiments of the present application, optionally, referring to FIG. 4, FIG. 8, FIG. 11 and FIG. 15, the battery cell 20 may further include a shell body 25, an electrode assembly 23 and an end cover 27. The shell body 25 includes a receiving cavity with an opening, the electrode assembly 23 is disposed in the receiving cavity, and the end cover 27 is covered in the opening. Among them, the shell 211 is the shell body 25 or the end cover 27.

The shell body 25 is in a rectangular parallelepiped shape, and the shell body 25 is formed with a receiving cavity for receiving the electrode assembly 23. The shell 23 may be made of a metal material, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., or an insulating material, such as plastic, etc. In other embodiments, the shell 23 may also be in a variety of shapes and sizes, such as a cylindrical shape, a hexagonal prism shape, etc. For example, in one case, the shape of the shell 23 may be determined according to the shape and size of the electrode assembly 23.

The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. The shell body 25 may contain one or more electrode assemblies 23. The electrode assembly 23 includes a pole piece unit and a pole ear 231. In the battery cell 20, two pole ears 231 extend from the side of the pole piece unit, which are a positive pole ear and a negative pole ear. The positive pole ear and the negative pole ear are located on the same side of the pole piece unit. The pole piece unit includes a negative pole piece, a positive pole piece and a separator. The separator is located between adjacent negative pole pieces and positive pole pieces to separate the negative pole piece from the positive pole piece.

In a possible design, the negative electrode sheet, the separator and the positive electrode sheet are stacked in sequence to form a electrode sheet unit of the electrode assembly 23, and the electrode sheet unit is a stacked structure. At the same time, the electrode sheet unit has a gap after being formed, and the electrolyte can enter the electrode sheet unit through the gap to infiltrate the negative electrode sheet and the positive electrode sheet.

The negative electrode sheet includes a negative electrode current collector (such as copper foil) and a negative electrode active material layer (such as carbon or silicon) coated on the surface of the negative electrode current collector, and the positive electrode sheet includes a positive electrode current collector (such as aluminum foil) and a positive electrode active material layer (such as ternary material, lithium iron phosphate or lithium cobalt oxide) coated on the surface of the positive electrode current collector. The negative electrode tab 231 is connected to the negative electrode sheet and extends from the electrode sheet unit, and the negative electrode tab 231 can be directly cut from the negative electrode current collector. The positive electrode tab 231 is connected to the positive electrode sheet and extends from the electrode sheet unit, and the positive electrode tab 231 can be directly cut from the positive electrode current collector.

The battery cell 20 includes a shell body 25 with a receiving cavity and an end cover 27 covering the opening of the receiving cavity, so that on the one hand, it is convenient to assemble the battery cell 20, and on the other hand, it is convenient to repair and replace the battery cell 20 when a failure occurs. At the same time, the shell 211 is the shell body 25 or the end cover 27, that is, the electrical connector 212 is provided on the shell body 25 or the end cover 27, so as to improve the applicability of the battery cell 20.

In a third aspect, please refer to FIG. 2 , the present application further provides a battery 100 , comprising a battery cell 20 according to any of the above embodiments.

In the technical solution of the embodiment of the present application, please refer to Figures 4, 8, 11 and 15. The battery 100 uses the battery cell 20 in the embodiment of the second aspect, and in the shell assembly 21 of the battery cell 20, a guide structure 2120 is provided at the connection between the electrical connector 212 of the shell assembly 21 and the pole ear 231 to guide the pole ear 231 to extend in the direction close to the inner wall of the shell 211, optimize the retracted state of the pole ear 231, and reduce the height space occupied by the pole ear 231, thereby avoiding the welding surface between the electrical connector 212 and the pole ear 231 squeezing the pole ear 231, causing the pole ear 231 to be inserted upside down into the electrode assembly 23, causing the pole ear 231 and the electrode assembly 23 to short-circuit, thereby effectively reducing the risk of short circuit in the battery cell 20 and the battery 100, and improving the safety performance of the battery cell 20 and the battery 100. At the same time, the setting of the guide structure 2120 can also reduce the height space occupied by the electrical connector 212 for shaping the pole ear. When the size of the battery cell 20 is fixed, the pole piece in the electrode assembly 23 has more design space in the battery cell 20, thereby improving the energy density of the battery cell 20 and further improving the energy density of the battery 100.

In the fourth aspect, please refer to FIG. 1 , the present application further provides an electric device 1000 , the electric device 1000 includes a battery 100 according to any one of the above embodiments, and the battery 100 is used to provide electric energy.

In the technical solution of the embodiment of the present application, please refer to Figures 2, 4, 8, 11 and 15. The electric device 1000 uses the battery 100 in the embodiment of the third aspect, and in the battery cell 20 of the battery 100, the electrical connector 212 of the housing assembly 21 and the tab 231 A guide structure 2120 is provided at the connection point of the housing 211 to guide the tab 231 to extend toward the inner wall of the housing 211, optimize the retracted state of the tab 231, and reduce the height space occupied by the shaping of the tab 231, thereby avoiding the problem that the welding surface between the electrical connector 212 and the tab 231 squeezes the tab 231, causing the tab 231 to be inserted into the electrode assembly 23 upside down and causing the tab 231 to short-circuit with the electrode assembly 23, thereby effectively reducing the risk of short circuit of the battery cell 20 and the battery 100, and improving the safety performance of the battery cell 20 and the battery 100. At the same time, the setting of the guide structure 2120 can also reduce the height space occupied by the electrical connector 212 for shaping the tab. When the size of the battery cell 20 is fixed, the pole piece in the electrode assembly 23 has more design space in the battery cell 20, which improves the energy density of the battery cell 20, thereby also improving the energy density of the battery 100, and thus improving the battery life of the electrical device 1000.

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

Claims

A housing assembly, comprising:

The housing is provided with an electrode lead-out hole; and

An electrical connector is installed in the electrode lead-out hole and is used to connect with the pole ear to output electrical energy. A guide structure is provided at the connection between the electrical connector and the pole ear, and the guide structure is used to guide the pole ear toward the inner wall of the shell.
The shell assembly according to claim 1, wherein the electrical connector includes a pole, the pole passes through the electrode lead-out hole, the pole includes a top located on the outside of the shell and a bottom located on the inside of the shell, and the guide structure is arranged at the bottom of the pole.
The housing assembly according to claim 2, wherein a cut angle is formed from the end face of the bottom of the pole to the side face, the guide structure includes an inclined surface at the cut angle, and the pole lug is welded to the inclined surface.
The housing assembly according to claim 3, wherein the guide structure is provided on opposite sides of the bottom of the pole in the extension direction of the end surface of the bottom of the pole, and the pole satisfies the following relationship: 0＜L1＜L/2, wherein L1 is the vertical distance from the starting point of the cut angle to the side surface of the bottom, and L is the total length of the bottom of the pole in the extension direction of the end surface of the bottom of the pole.
The shell assembly according to claim 3, wherein the pole satisfies the following relationship: T-T1≥0.2mm, wherein T is the total thickness of the bottom of the pole in the direction of the central axis of the electrode lead-out hole, and T1 is the thickness of the outer side of the bottom of the pole in the direction of the central axis of the electrode lead-out hole after the cut angle is formed.
The housing assembly according to claim 2, wherein a chamfer is formed from the end face of the bottom of the pole to the side face, the guide structure includes an arc surface of the chamfer, and the pole lug is welded to the end face of the bottom of the pole.
The housing assembly according to claim 6, wherein the radius of the rounded corner is greater than or equal to 0.2 mm.
The shell assembly according to claim 1, wherein the electrical connector includes a pole and an adapter, the pole passes through the electrode lead-out hole, the pole includes a top and a bottom located on opposite sides of the shell, the adapter is connected to the bottom of the pole, and the guide structure is arranged on the adapter.
The shell assembly according to claim 8, wherein the adapter plate includes a first sub-portion and a second sub-portion, the first sub-portion is connected to the bottom of the pole, the second sub-portion extends obliquely from the side edge of the first sub-portion toward the direction close to the inner wall of the shell, the surface of the second sub-portion facing away from the pole is a slope, the guide structure includes the slope, and the pole ear is welded to the slope.
The shell assembly according to claim 9, wherein the guide structure is provided on both opposite sides of the adapter plate in the direction close to the inner wall of the shell, and the adapter plate satisfies the following relationship: 0＜D1＜D/2, wherein D1 is the vertical distance from the starting point of the inclination of the second sub-portion to the side surface of the adapter plate, and D is the total length of the adapter plate in the extension direction of the end surface at the bottom of the pole.
The shell assembly according to claim 9, wherein the adapter sheet satisfies the following relationship: h-t≥0.2mm, wherein h is the vertical distance between the farthest point where the second sub-section is inclined relative to the first sub-section and the outermost side of the first sub-section in the direction of the central axis of the electrode lead-out hole, and t is the thickness of the adapter sheet in the direction of the central axis of the electrode lead-out hole.
The shell assembly according to claim 8, wherein the adapter plate includes a side surface and an end surface, the end surface is the surface of the adapter plate facing away from the pole, the side surface of the adapter plate is connected to the end surface of the adapter plate, a chamfer is formed from the end surface of the adapter plate to the side surface of the adapter plate, the guide structure includes the rounded arc surface, and the pole ear is welded to the end surface of the adapter plate.
The housing assembly according to claim 12, wherein the radius of the rounded corner is greater than or equal to 0.2 mm.
The housing assembly according to any one of claims 1 to 13, wherein the housing comprises an outer side and an inner side opposite to each other, the top of the pole of the electrical connector is located on the outer side of the housing, and the bottom of the pole of the electrical connector is located on the inner side of the housing; the housing assembly further comprises:

A first insulating member, mounted on the outer side of the housing;

A second insulating member is installed on the inner side of the housing;

A connecting member is installed on a side of the first insulating member that is away from the shell, the top of the pole is connected to the connecting member, and the bottom of the pole is in contact with the second insulating member.
The housing assembly according to claim 14, further comprising:

A sealing member is sleeved on the pole and located in the electrode lead-out hole, and is used for sealing the gap between the shell and the pole.
A battery cell, comprising the shell assembly according to any one of claims 1 to 15.
The battery cell according to claim 16, wherein the battery cell comprises:

The shell body comprises a receiving cavity with an opening;

An electrode assembly, disposed in the accommodating cavity;

An end cover, which is arranged on the opening;

Wherein, the shell is the shell body or the end cover.
A battery, comprising the battery cell according to claim 16 or 17.
An electrical device, wherein the electrical device comprises the battery as claimed in claim 18, and the battery is used to provide electrical energy.