Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly, a pole, a current collecting component and a mounting frame, the housing has a first wall. The electrode assembly is contained in the shell and comprises a main body part and a tab, and the tab is arranged at the end, facing the first wall, of the main body part in the thickness direction of the first wall. The pole is mounted on the first wall. And the current collecting component is connected with the pole and the tab. In the thickness direction of the first wall, the mounting frame is arranged between the first wall and the main body part, and the flow collecting component is connected to the mounting frame. According to the present invention, the current collecting member can be fixed and supported through the mounting rack, such that the mounting rack can stabilize the current collecting member when the tab of the electrode assembly is connected with the current collecting member and then assembled into the housing so as to easily reduce the assembling difficulty between the current collecting member and the pole so as to improve the production efficiency of the battery monomer; and the connection quality between the current collecting component and the pole is improved.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries play an irreplaceable and important role as the power source of electric vehicles. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. As the core components of new energy vehicles, batteries have high requirements in terms of safety in use and service life. The battery cell of the battery is usually assembled into an electrode assembly (bare cell) by winding or laminating the positive electrode sheet, the negative electrode sheet and the diaphragm, and then put into the outer shell and finally injected with the electrolyte. Among them, the electrode assembly of the battery cell usually needs to be interconnected with the poles provided on the outer shell through the current collecting component to realize the input or output of the electric energy of the battery cell. However, the assembly between the current collecting component and the pole of the battery cell in the prior art is difficult, which leads to problems such as low production efficiency and poor production quality of the battery cell.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the production efficiency and production quality of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell comprising a shell, an electrode assembly, a pole, a current collecting member and a mounting bracket; the shell has a first wall; the electrode assembly is accommodated in the shell, the electrode assembly comprises a main body and a pole tab, and along the thickness direction of the first wall, the pole tab is arranged at one end of the main body facing the first wall; the pole is mounted on the first wall; the current collecting member connects the pole and the pole tab; along the thickness direction of the first wall, the mounting bracket is arranged between the first wall and the main body, and the current collecting member is connected to the mounting bracket.

[0006] In the above technical solution, a mounting frame is provided inside the shell, and the mounting frame is located between the first wall and the main body of the electrode assembly in the thickness direction of the first wall. By connecting the current collecting component to the mounting frame, the current collecting component can be fixed and supported. On the one hand, it can reduce the shaking or displacement of the current collecting component during use, thereby helping to reduce the risk of connection failure between the current collecting component and the pole and the ear. On the other hand, when the ear of the electrode assembly is connected with the current collecting component and assembled into the shell, the current collecting component can be stabilized by the mounting frame, so as to facilitate the assembly and connection of the current collecting component with the pole installed on the first wall, thereby helping to reduce the assembly difficulty between the current collecting component and the pole, so as to improve the production efficiency of the battery cell, and to improve the connection quality between the current collecting component and the pole, so as to ensure the production quality of the battery cell.

[0007] In some embodiments, a mounting hole is provided on the mounting frame, and the mounting hole passes through the mounting frame along the thickness direction of the first wall; wherein at least a portion of the current collecting component is accommodated in the mounting hole.

[0008] In the above technical solution, a mounting hole for accommodating the current collecting component is provided on the mounting frame, and the mounting hole passes through both sides of the mounting frame along the thickness direction of the first wall, so that the current collecting component can be connected to the poles and tabs located on both sides of the mounting frame, thereby further reducing the difficulty of assembling the battery cell and improving the production efficiency of the battery cell.

[0009] In some embodiments, a slot is provided on a wall surface of the mounting hole, and the current collecting component includes a first connecting portion, at least a portion of which is inserted into the slot.

[0010] In the above technical solution, a slot for inserting the first connecting portion of the current collecting component is provided on the wall surface of the mounting hole, so that the current collecting component is connected to the wall surface of the mounting hole, thereby fixing the current collecting component on the mounting frame. This structure facilitates accommodating the current collecting component into the mounting hole and facilitating the assembly of the current collecting component.

[0011] In some embodiments, the mounting bracket is injection molded so that the first connecting portion is connected to a slot wall surface of the slot.

[0012] In the above technical solution, the mounting frame is set to be injection molded on the current collecting component, so that the first connecting part can be connected to the groove wall of the slot, and part of the mounting frame is covered on the outside of the part of the first connecting part, so that the mounting frame forms a slot in the area covering the first connecting part, that is, the first connecting part and the groove wall of the slot are bonded together. The battery cell adopting this structure can effectively improve the connection stability and reliability between the mounting frame and the current collecting component, thereby helping to reduce the risk of shaking or detachment of the current collecting component.

[0013] In some embodiments, the current collecting component also includes a second connecting portion; the second connecting portion is connected to the first connecting portion, and the second connecting portion is connected to the pole ear; wherein, part of the first connecting portion is inserted into the slot, and the part of the first connecting portion located outside the slot is connected to the pole.

[0014] In the above technical solution, the current collecting member is provided with a first connection portion connected to the pole and a second connection portion connected to the tab, thereby reducing interference between the area where the current collecting member connects to the tab and the area where it connects to the pole. Furthermore, by connecting the portion of the first connection portion outside the slot to the pole, the area where the pole and current collecting member connect is closer to where the current collecting member connects to the mounting bracket, thereby improving the stability and reliability of the assembly of the pole and current collecting member, thereby enhancing the connection quality between the pole and the current collecting member.

[0015] In some embodiments, the second connecting portion is located in the mounting hole.

[0016] In the above technical solution, by setting the second connecting part as a whole in the mounting hole, the second connecting part is easily connected to the tab of the electrode assembly, and the interference between the second connecting part and the main body of the electrode assembly can be reduced.

[0017] In some embodiments, along the thickness direction of the first wall, the tab abuts against a side of the second connecting portion facing the main body.

[0018] In the above technical solution, by abutting the electrode tab against the side of the second connecting portion facing the main body in the thickness direction of the first wall, the electrode tab can play a certain supporting role on the second connecting portion, so that the electrode tab can play a certain supporting effect on the current collecting component when the pole is assembled with the first connecting portion of the current collecting component, thereby facilitating further improving the stability of the current collecting component connected to the mounting frame, reducing the deformation of the current collecting component when assembled with the pole, and thus effectively improving the connection quality between the pole and the first connecting portion of the current collecting component.

[0019] In some embodiments, along the thickness direction of the first wall, the second connection portion is farther away from the main body portion than the first connection portion.

[0020] In the above technical solution, by setting the second connecting portion of the current collecting component to be farther away from the main body than the first connecting portion in the thickness direction of the first wall, the current collecting component can form a space for accommodating the electrode ear on the side of the second connecting portion facing the main body, which is conducive to alleviating the phenomenon that the electrode ear is crushed by the second connecting portion.

[0021] In some embodiments, the battery cell further includes a first insulating member; along the thickness direction of the first wall, the first insulating member is disposed between the mounting frame and the first wall to insulate and isolate the current collecting member from the first wall; wherein, along the thickness direction of the first wall, the height of the pole protruding from the surface of the first insulating member facing the main body is H1, and the height of the second connecting portion protruding from the surface of the first connecting portion away from the main body is H2, satisfying H1≥H2.

[0022] In the above technical solution, in the thickness direction of the first wall, the dimension of the pole extending out of the surface of the first insulating part facing the main body is set to be greater than or equal to the surface of the second connecting part protruding out of the first connecting part away from the main body, that is, when the electrode assembly is assembled into the outer shell, the pole will preferentially abut against the first connecting part of the current collecting component, so that there is a gap with a dimension greater than or equal to zero between the second connecting part and the first insulating part, which is beneficial to ensure the connection quality between the pole and the first connecting part, and alleviate the phenomenon of connection failure or incomplete connection due to the gap between the pole and the first connecting part.

[0023] In some embodiments, along the thickness direction of the first wall, a distance between a surface of the mounting bracket facing away from the main body and a surface of the first connecting portion facing away from the main body is H3, satisfying H1 ≥ H3.

[0024] In the above technical solution, in the thickness direction of the first wall, by setting the distance between the surface of the mounting frame away from the main body and the surface of the first connecting part away from the main body to be less than or equal to the size of the surface of the pole extending out of the first insulating part facing the main body, that is, the size of the surface of the pole extending out of the first insulating part facing the main body is greater than or equal to the distance between the surface of the mounting frame facing the first insulating part and the surface of the first connecting part facing the first insulating part, when the electrode assembly is assembled into the outer shell, the pole will preferentially abut against the first connecting part of the current collecting component, so that there is a gap with a size greater than or equal to zero between the mounting frame and the first insulating part, which is beneficial to ensure the connection quality between the pole and the first connecting part, and alleviate the phenomenon of connection failure or incomplete connection due to the gap between the pole and the first connecting part.

[0025] In some embodiments, there are two electrode assemblies, and the two electrode assemblies are stacked along a first direction, and the first direction is perpendicular to the thickness direction of the first wall; the current collecting component includes two second connecting parts, and along the first direction, the two second connecting parts are respectively connected to the two sides of the first connecting part, and the two second connecting parts are respectively connected to the tabs of the two electrode assemblies.

[0026] In the above technical solution, by setting two electrode assemblies contained in the outer shell, and the two electrode assemblies are arranged along the first direction, correspondingly, two second connecting parts are provided on the current collecting component, and the two second connecting parts are respectively connected to the two sides of the first connecting part in the first direction, so that the current collecting component can be connected to the pole ears of the two electrode assemblies at the same time to realize parallel connection between the two electrode assemblies.

[0027] In some embodiments, the size of the mounting hole in the first direction is W1, and the distance between outer edges of the two second connection portions facing away from each other in the first direction is W2, satisfying W1>W2.

[0028] In the above technical solution, by setting the distance between the outer edges of the two second connecting parts that are away from each other in the first direction to be smaller than the size of the mounting hole in the first direction, that is, the size of the current collecting component in the first direction is smaller than the size of the mounting hole, it is beneficial to ensure that the current collecting component is assembled into the mounting hole in the first direction, so as to reduce the interference between the current collecting component and the hole wall surface of the mounting hole in the first direction.

[0029] In some embodiments, one end of the first connecting portion in the second direction is inserted into the slot, the size of the mounting hole in the second direction is L1, and the size of the second connecting portion in the second direction is L2, satisfying L1>L2, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

[0030] In the above technical solution, by setting the size of the second connecting part in the second direction to be smaller than the size of the mounting hole, the second connecting part can be assembled into the mounting hole after the first connecting part is inserted into the groove along the second direction, so as to reduce the interference between the second connecting part and the hole wall surface of the mounting hole in the second direction.

[0031] In some embodiments, there are two current collecting components and two poles, the mounting frame is provided with two mounting holes, the current collecting components, the mounting holes and the poles correspond one to one; the electrode assembly has two pole tabs with opposite polarities, and the two pole tabs are respectively connected to the two current collecting components.

[0032] In the above technical solution, by setting two current collecting components and two mounting holes provided on the mounting frame, and each current collecting component is assembled into one mounting hole, the mounting frame can simultaneously stabilize two current collecting components with opposite polarities, so as to facilitate the assembly of the two current collecting components with the two poles.

[0033] In some embodiments, along a thickness direction of the first wall, the mounting bracket has a first surface facing the main body, and the first surface abuts against the main body.

[0034] In the above technical solution, by pressing the first surface of the mounting frame facing the main body against the main body of the electrode assembly, the main body can provide support for the mounting frame, thereby improving the structural stability of the mounting frame assembled between the main body and the first wall, so as to further alleviate the phenomenon of shaking or displacement of the current collecting component in the outer shell, which is conducive to further improving the connection quality between the current collecting component and the pole.

[0035] In some embodiments, an avoidance groove is provided on the first surface, and the avoidance groove is used to accommodate the tab.

[0036] In the above technical solution, an avoidance groove for accommodating the tab is provided on the first surface of the mounting frame facing the main body to reduce the squeezing of the tab by the mounting frame, thereby helping to reduce the risk of the tab being damaged or inserted upside down into the main body.

[0037] In some embodiments, the outer shell includes a shell and an end cover; the interior of the shell forms a accommodating cavity with an opening, and the electrode assembly is accommodated in the accommodating cavity; the end cover covers the opening; wherein the shell includes the first wall.

[0038] In the above technical solution, the shell includes a first wall, that is, the pole is installed on the shell, so that after the current collecting component is connected to the pole and the pole ear of the electrode assembly, the electrode assembly can be electrically connected to the pole, so as to realize the input or output of electrical energy of the battery cell. The battery cell with this structure can alleviate the phenomenon that the force is transferred to the shell and the end cover through the pole when the current collecting component pulls or twists the pole during use, thereby effectively alleviating the pulling between the end cover and the shell, so as to reduce the risk of leakage caused by connection failure between the end cover and the shell, and thus help to improve the safety and service life of the battery cell.

[0039] In some embodiments, the housing is integrally formed.

[0040] In the above technical solution, the shell is an integrally molded structure. A shell with such a structure can improve the structural strength of the shell itself, so as to alleviate the phenomenon that when the busbar component pulls or twists the pole, the force is transferred to the shell through the pole, causing cracks in the shell. This can effectively reduce the risk of leakage of the battery cell during use, which is beneficial to improving the safety and service life of the battery cell.

[0041] In some embodiments, the shell also includes a second wall; the second wall is arranged around the first wall, and along the thickness direction of the first wall, one end of the second wall is connected to the first wall, and the other end forms the opening, the second wall and the first wall jointly define the accommodating cavity, and the first wall is arranged opposite to the end cover.

[0042] In the above technical solution, the end cover covers the opening formed by the second wall, and the end cover and the first wall are arranged relative to each other in the thickness direction of the first wall. This structure can make the first wall equipped with the pole away from the end cover of the shell, so that there is no direct connection between the first wall and the end cover, thereby further reducing the force generated by the pulling or twisting of the pole by the confluence component on the end cover, thereby reducing the risk of connection failure between the end cover and the shell, and further helping to further reduce the risk of leakage of the battery cell during use.

[0043] In some embodiments, the battery cell further includes a first insulating member; along a thickness direction of the first wall, the first insulating member is disposed between the mounting bracket and the first wall to insulate and isolate the current collecting member from the first wall.

[0044] In the above technical solution, a first insulating member is further provided between the mounting frame and the first wall, so that the first insulating member can insulate and isolate the current collecting component and the first wall, thereby effectively reducing the risk of short circuit between the current collecting component and the first wall, thereby improving the safety of battery cells.

[0045] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0046] In a third aspect, an embodiment of the present application further provides an electrical device comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

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

[0049] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0050] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0051] FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0052] FIG5 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0053] FIG6 is a partial enlarged view of the battery cell at point A shown in FIG5 ;

[0054] FIG7 is a schematic diagram of the connection between the current collecting component and the mounting frame provided in some embodiments of the present application;

[0055] FIG8 is a schematic structural diagram of a mounting bracket provided in some embodiments of the present application;

[0056] FIG9 is a schematic structural diagram of a current collecting component provided in some embodiments of the present application;

[0057] FIG10 is a front view of a current collecting member provided in some embodiments of the present application in a second direction;

[0058] FIG11 is a top view of a current collecting member connected to a mounting frame according to some embodiments of the present application;

[0059] FIG12 is a front view of a mounting bracket provided in a first direction according to some embodiments of the present application.

[0060] Icon: 1000-vehicle; 100-battery; 10-casing; 11-first casing body; 12-second casing body; 20-battery cell; 21-casing; 211-shell; 2111-first wall; 2111a-lead-out hole; 2112-accommodation chamber; 2113-opening; 2114-second wall; 212-end cover; 22-electrode assembly; 221-main body; 222-ear; 23-pole; 24-current collecting member; 241-first connecting part; 242-second connecting part; 25-mounting frame; 251-mounting hole; 2511-slot; 252-first surface; 2521-avoidance groove; 26-first insulating member; 27-second insulating member; 28-seal; 29-third insulating member; 200-controller; 300-motor; X-thickness direction of the first wall; Y-first direction; Z-second direction. DETAILED DESCRIPTION

[0061] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0063] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0065] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0066] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0067] The term "plurality" used in this application refers to two or more (including two).

[0068] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0069] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a housing that encloses one or more battery cells or multiple battery modules. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0070] A battery cell consists of a casing, an electrode assembly, and an electrolyte. The casing is used to hold the electrode assembly and electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive active material layer serves as the positive tab, allowing power to be input or output from the positive electrode sheet through the positive tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The portion of the negative electrode collector not coated with the negative active material layer serves as the negative tab, allowing power to be input or output from the negative electrode sheet through the negative tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together.

[0071] The material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the present invention is not limited thereto.

[0072] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a vital component of today's new energy development. A battery cell is typically assembled from a positive electrode sheet, a negative electrode sheet, and a separator through winding or lamination to form an electrode assembly (bare cell), which is then enclosed in a casing and finally filled with electrolyte. However, with the continuous development of battery technology, higher requirements have been placed on battery safety performance and service life.

[0073] For general battery cells, the outer shell of the battery cell usually includes a shell and an end cover. The end cover covers the opening of the shell. In order to facilitate the assembly of the battery cell, the pole is usually assembled to the end cover of the battery cell, so that when the end cover and the shell are covered, the pole can be welded to the pole ear of the electrode assembly through the current collecting component provided in the shell to achieve electrical connection between the pole and the electrode assembly, so as to realize the input or output of the electric energy of the battery cell through the pole as the output pole of the battery cell, and finally the end cover is connected to the shell.

[0074] The inventors found that a busbar component is usually provided in the battery, and the busbar component is connected to the pole of the battery cell to realize series, parallel or mixed connection between multiple battery cells. During the later use of the battery with this structure, due to the shaking or movement of the battery cell, the busbar component connected to the pole of the battery cell will generate a certain pulling force or torsional force on the pole, and since the pole is installed on the end cover, the force exerted by the busbar component on the pole will be transmitted to the end cover through the pole, causing a certain pulling or torsional force on the end cover, which will cause the end cover and the shell to easily suffer from long-term fatigue stress and other connection failures such as weld cracking, thereby shortening the service life of the battery cell and causing the battery cell to have safety hazards such as leakage during use, which is not conducive to consumer use.

[0075] To address the problem of connection failures such as weld cracking between the end cap and the housing due to long-term fatigue stress, the prior art utilizes the poles to be assembled on the housing so that the pulling or torsional force exerted by the current collecting component on the poles is not transmitted between the end cap and the housing. This effectively alleviates the problem of connection failures such as weld cracking between the end cap and the housing due to long-term fatigue stress, thereby increasing the service life of the battery cells and effectively reducing the risk of leakage. However, in battery cells with this structure, since the poles are arranged on the housing, the electrode assembly must be assembled into the housing before the current collecting component and the poles can be assembled and connected to each other. This makes the connection between the current collecting component and the poles more difficult and the connection quality is poor, which in turn results in low production efficiency and poor production quality of the battery cells.

[0076] Based on the above considerations, in order to solve the problems of low production efficiency and poor production quality of battery cells, the inventors, after in-depth research, designed a battery cell, which includes a housing, an electrode assembly, a pole, a current collecting component, and a mounting frame. The housing has a first wall. The electrode assembly is accommodated in the housing, and the electrode assembly includes a main body and a tab. Along the thickness direction of the first wall, the tab is arranged at one end of the main body facing the first wall. The pole is mounted on the first wall. The current collecting component connects the pole and the tab. Along the thickness direction of the first wall, the mounting frame is arranged between the first wall and the main body, and the current collecting component is connected to the mounting frame.

[0077] In a battery cell of this structure, a mounting frame is provided inside the shell, and the mounting frame is located between the first wall and the main body of the electrode assembly in the thickness direction of the first wall. By connecting the current collecting component to the mounting frame, the current collecting component can be fixed and supported. On the one hand, it can reduce the phenomenon of shaking or displacement of the current collecting component during use, thereby helping to reduce the risk of connection failure between the current collecting component and the pole and the ear. On the other hand, when the ear of the electrode assembly is assembled into the shell after being connected with the current collecting component, the mounting frame can stabilize the current collecting component, so as to facilitate the assembly and connection of the current collecting component with the pole installed on the first wall, thereby helping to reduce the assembly difficulty between the current collecting component and the pole, so as to improve the production efficiency of the battery cell, and to improve the connection quality between the current collecting component and the pole, so as to ensure the production quality of the battery cell.

[0078] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This helps address the difficulty and poor quality of connecting the current collecting components and terminals of the battery cells, thereby improving the production efficiency and quality of the battery cells.

[0079] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0080] 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.

[0081] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0082] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0083] Please refer to Figures 2 and 3. Figure 2 is an exploded view of the structure of the battery 100 provided in some embodiments of the present application, and Figure 3 is a schematic diagram of the structure of the battery cell 20 provided in some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is used to be accommodated in the case 10. Among them, the case 10 is used to provide an assembly space for the battery cell 20, and the case 10 can adopt a variety of structures. In some embodiments, the case 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space. The first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0084] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0085] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular, or in other shapes. For example, in FIG3 , the battery cell 20 is a rectangular parallelepiped.

[0086] According to some embodiments of the present application, referring to FIG3 and further to FIG4, FIG5, and FIG6, FIG4 is an exploded view of the structure of a battery cell 20 provided in some embodiments of the present application, FIG5 is a cross-sectional view of a battery cell 20 provided in some embodiments of the present application, and FIG6 is a partial enlarged view of a portion A of the battery cell 20 shown in FIG5. The present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, a terminal post 23, a current collecting member 24, and a mounting bracket 25. The housing 21 has a first wall 2111. The electrode assembly 22 is accommodated within the housing 21. The electrode assembly 22 includes a main body 221 and a tab 222. The tab 222 is disposed at one end of the main body 221 facing the first wall 2111 along the thickness direction X of the first wall. The terminal post 23 is mounted on the first wall 2111, and the current collecting member 24 connects the terminal post 23 and the tab 222. Along the thickness direction X of the first wall, the mounting bracket 25 is disposed between the first wall 2111 and the main body 221 , and the current collecting member 24 is connected to the mounting bracket 25 .

[0087] The housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms. The housing 21 can also be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0088] In some embodiments, the housing 21 may include a shell 211 and an end cover 212, wherein a accommodating cavity 2112 is formed inside the shell 211, and the accommodating cavity 2112 has an opening 2113, that is, the shell 211 is a hollow structure with one end open, and the end cover 212 covers the opening 2113 of the shell 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0089] Optionally, the first wall 2111 for mounting the pole 23 may be the end cap 212 or a wall of the housing 211. For example, in FIG4 and FIG5 , the first wall 2111 is a wall of the housing 211 disposed opposite the end cap 212 in the thickness direction X of the first wall. Of course, in other embodiments, the first wall 2111 may also be a wall of the housing 211 adjacent to and abutting the end cap 212.

[0090] When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 211 first, and the housing 211 may be filled with electrolyte. The end cap 212 may then be placed over the opening 2113 of the housing 211 .

[0091] The housing 211 can have a variety of shapes, such as a cylinder or a rectangular parallelepiped. The shape of the housing 211 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, the housing 211 can have a cylindrical structure; if the electrode assembly 22 has a rectangular parallelepiped structure, the housing 211 can have a rectangular parallelepiped structure. Of course, the end cap 212 can also have a variety of structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 4, the housing 211 has a rectangular parallelepiped structure.

[0092] It should be noted that the electrode assembly 22 is a component in the battery cell 20 where the electrochemical reaction occurs. The main body 221 of the electrode assembly 22 may include a positive electrode sheet, a negative electrode sheet, and a separator. The main body 221 of the electrode assembly 22 may be a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet. The tabs 222 of the electrode assembly 22 are components formed by stacking and connecting the areas on the positive electrode sheet that are not coated with the positive electrode active material layer, or components formed by stacking and connecting the areas on the negative electrode sheet that are not coated with the negative electrode active material layer.

[0093] Along the thickness direction X of the first wall, the tab 222 is provided at one end of the main body 221 facing the first wall 2111 , that is, the tab 222 is formed at one end of the electrode assembly 22 close to the first wall 2111 in the thickness direction X of the first wall.

[0094] Optionally, the number of electrode assemblies 22 housed within the housing 21 may be one or more. For example, in FIG4 , there are two electrode assemblies 22, which are stacked along the thickness of the battery cell 20. That is, the two electrode assemblies 22 are stacked along the thickness of the battery cell 20. Of course, in other embodiments, the number of electrode assemblies 22 housed within the housing 21 may also be three, four, five, or six, etc.

[0095] In some embodiments, the battery cell 20 may further include a pressure relief mechanism mounted on the housing 21. Alternatively, the pressure relief mechanism may be disposed on the end cap 212 or the housing 211. The pressure relief mechanism is configured to release pressure within the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value. The pressure relief mechanism may be a component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve.

[0096] In some embodiments, as shown in Figures 4 and 6, the battery cell 20 may further include a first insulating member 26. Along the thickness direction X of the first wall, the first insulating member 26 is disposed between the mounting frame 25 and the first wall 2111 to insulate and isolate the current collecting member 24 from the first wall 2111.

[0097] For example, the first insulating member 26 may be made of plastic, rubber, silicone, or the like.

[0098] In some embodiments, referring to Figures 4 and 6, a lead-out hole 2111a is provided on the first wall 2111, and the lead-out hole 2111a passes through both sides of the first wall 2111 along the thickness direction X of the first wall. The pole 23 is passed through the lead-out hole 2111a to install the pole 23 on the first wall 2111. One end of the pole 23 is used to be connected to the current collecting component 24, and the other end is used to be connected to the collecting component of the battery 100 to realize the input or output of electrical energy of the battery cell 20.

[0099] The pole 23 is insulated and mounted on the first wall 2111 , that is, no electrical connection is formed between the pole 23 and the first wall 2111 .

[0100] Optionally, as shown in FIG6 , the battery cell 20 may further include a second insulating member 27 and a sealing member 28. Along the thickness direction X of the first wall, the second insulating member 27 is disposed on the side of the first wall 2111 facing away from the main body 221 and is located between the terminal post 23 and the first wall 2111 to insulate and isolate the terminal post 23 from the first wall 2111. At least a portion of the sealing member 28 is disposed within the lead-out hole 2111a to seal the gap between the terminal post 23 and the wall of the lead-out hole 2111a.

[0101] Exemplarily, the second insulating member 27 and the sealing member 28 can be made of various materials, such as plastic, rubber, or silicone.

[0102] In some embodiments, as shown in FIG. 4 , the battery cell 20 may further include a third insulating member 29 . The third insulating member 29 is wrapped around the outside of the electrode assembly 22 to insulate and isolate the electrode assembly 22 from the housing 21 .

[0103] Exemplarily, the third insulating member 29 is an insulating film coated on the electrode assembly 22 , and the material of the third insulating member 29 can be plastic, rubber, silicone, or the like.

[0104] The current collecting member 24 connects the pole 23 and the tab 222 of the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the pole 23. The current collecting member 24 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0105] The mounting frame 25 is arranged between the first wall 2111 and the main body 221 in the thickness direction X of the first wall, and serves to provide installation and fixation for the current collecting component 24. There can be various connection methods between the current collecting component 24 and the mounting frame 25, such as clamping, bolting, bonding or injection molding of the mounting frame 25 on the current collecting component 24.

[0106] The mounting frame 25 is made of insulating material, which can be made of various materials, such as plastic, rubber or silicone.

[0107] A mounting bracket 25 is provided inside the outer shell 21, and the mounting bracket 25 is located between the first wall 2111 and the main body 221 of the electrode assembly 22 in the thickness direction X of the first wall. By connecting the current collecting component 24 to the mounting bracket 25, the current collecting component 24 can be fixed and supported. On the one hand, it can reduce the shaking or displacement of the current collecting component 24 during use, thereby helping to reduce the risk of connection failure between the current collecting component 24 and the pole 23 and the pole ear 222. On the other hand, when the pole ear 222 of the electrode assembly 22 is connected with the current collecting component 24 and assembled into the outer shell 21, the current collecting component 24 can be stabilized by the mounting bracket 25, so as to facilitate the assembly and connection of the current collecting component 24 with the pole 23 installed on the first wall 2111, thereby helping to reduce the assembly difficulty between the current collecting component 24 and the pole 23, thereby improving the production efficiency of the battery cell 20, and helping to improve the connection quality between the current collecting component 24 and the pole 23, thereby ensuring the production quality of the battery cell 20.

[0108] According to some embodiments of the present application, referring to FIG4 and further referring to FIG7 and FIG8, FIG7 is a schematic diagram of the connection between the current collecting member 24 and the mounting bracket 25 provided in some embodiments of the present application, and FIG8 is a schematic diagram of the structure of the mounting bracket 25 provided in some embodiments of the present application. The mounting bracket 25 is provided with a mounting hole 251, which passes through the mounting bracket 25 along the thickness direction X of the first wall, and at least a portion of the current collecting member 24 is accommodated in the mounting hole 251.

[0109] The mounting hole 251 passes through the mounting frame 25 along the thickness direction X of the first wall. That is, the mounting hole 251 extends along the thickness direction X of the first wall and passes through both sides of the mounting frame 25 .

[0110] At least a portion of the current collecting member 24 is accommodated within the mounting hole 251, that is, the current collecting member 24 may be partially accommodated within the mounting hole 251, or the entire current collecting member 24 may be accommodated within the mounting hole 251. For example, in Figures 7 and 8, a portion of the current collecting member 24 is inserted into the wall of the mounting hole 251, while the other portion is accommodated within the mounting hole 251, so that the current collecting member 24 is mounted on the mounting frame 25. Of course, in other embodiments, the current collecting member 24 may also be connected to the wall of the mounting hole 251 by bonding or screwing, so that the entire current collecting member 24 is accommodated within the mounting hole 251.

[0111] For example, in FIG8 , the mounting hole 251 is rectangular in shape, and the width and length directions of the mounting hole 251 are respectively the first direction Y and the second direction Z. The first direction Y, the second direction Z, and the thickness direction X of the first wall are perpendicular to each other. In some embodiments, the shape of the mounting hole 251 is not limited to this, and the shape of the mounting hole 251 can also be circular, elliptical, or pentagonal, etc.

[0112] By providing a mounting hole 251 on the mounting frame 25 for accommodating the current collecting component 24, and the mounting hole 251 passes through both sides of the mounting frame 25 along the thickness direction X of the first wall, so that the current collecting component 24 can be connected to the pole 23 and the pole ear 222 located on both sides of the mounting frame 25, it is beneficial to further reduce the assembly difficulty of the battery cell 20 and improve the production efficiency of the battery cell 20.

[0113] According to some embodiments of the present application, referring to Figures 7 and 8, and further referring to Figure 9, which is a schematic structural diagram of a current collecting member 24 provided in some embodiments of the present application, a slot 2511 is provided on the wall surface of the mounting hole 251, and the current collecting member 24 includes a first connecting portion 241, at least a portion of which is inserted into the slot 2511.

[0114] The mounting hole 251 is provided with a slot 2511 on its wall surface. The slot 2511 is provided on one of the two wall surfaces of the mounting hole 251 that are opposite to each other in the second direction Z. The first connection portion 241 of the current collecting member 24 is inserted into the slot 2511 along the second direction Z. Of course, in other embodiments, the slot 2511 may also be provided on one of the two wall surfaces of the mounting hole 251 that are opposite to each other in the first direction Y.

[0115] At least a portion of the first connection portion 241 is inserted into the slot 2511, that is, the first connection portion 241 can be partially inserted into the slot 2511 of the mounting frame 25, or the first connection portion 241 can be entirely inserted into the slot 2511 of the mounting frame 25. For example, in FIG7 , a portion of the first connection portion 241 is inserted into the slot 2511 of the mounting frame 25 to achieve plug-in engagement between the current collecting member 24 and the mounting frame 25.

[0116] By setting a slot 2511 on the wall surface of the mounting hole 251 for inserting the first connecting part 241 of the current collecting component 24, the current collecting component 24 is connected to the wall surface of the mounting hole 251, thereby fixing the current collecting component 24 on the mounting frame 25. This structure makes it easy to accommodate the current collecting component 24 in the mounting hole 251 and to assemble the current collecting component 24.

[0117] In some embodiments, as shown in FIG. 7 , the mounting bracket 25 is injection molded so that the first connecting portion 241 is connected to the wall surface of the slot 2511 .

[0118] The mounting frame 25 is injection molded so that the first connection portion 241 is connected to the wall surface of the slot 2511. In other words, the mounting frame 25 is manufactured and molded using an injection molding process, and during the injection molding process, the mounting frame 25 is directly injection molded onto the first connection portion 241 of the current collecting member 24, so that the slot 2511 is formed on the wall surface of the mounting hole 251 of the mounting frame 25, and the wall surface of the slot 2511 is bonded to the first connection portion 241. Of course, in other embodiments, the mounting frame 25 can also be separately injection molded, and then the first connection portion 241 of the current collecting member 24 is inserted into the slot 2511 to achieve the connection of the current collecting member 24 to the mounting frame 25.

[0119] By setting the mounting frame 25 to be injection molded on the current collecting component 24, the first connecting part 241 can be connected to the groove wall of the slot 2511, and part of the mounting frame 25 is covered on the outside of the part of the first connecting part 241, so that the mounting frame 25 forms a slot 2511 in the area covering the first connecting part 241, that is, the first connecting part 241 and the groove wall of the slot 2511 are bonded together. The battery cell 20 adopting this structure can effectively improve the connection stability and reliability between the mounting frame 25 and the current collecting component 24, thereby helping to reduce the risk of shaking or detachment of the current collecting component 24.

[0120] According to some embodiments of the present application, as shown in Figures 4, 7, and 9, the current collecting member 24 further includes a second connecting portion 242. The second connecting portion 242 is connected to the first connecting portion 241 and is connected to the terminal tab 222. A portion of the first connecting portion 241 is inserted into the slot 2511, and the portion of the first connecting portion 241 outside the slot 2511 is connected to the terminal post 23.

[0121] Among them, part of the first connecting part 241 is inserted into the slot 2511, and the part of the first connecting part 241 located outside the slot 2511 is connected to the pole 23, that is, the first connecting part 241 has a part inserted into the slot 2511, and also has a part located in the mounting hole 251, so that the part of the first connecting part 241 located in the mounting hole 251 is used to be interconnected with the pole 23.

[0122] Exemplarily, in FIG. 7 , the first connection portion 241 extends along the second direction Z, and the first connection portion 241 is inserted into the slot 2511 along the second direction Z.

[0123] 9 , the second connection portion 242 is connected to one side of the first connection portion 241 in the first direction Y. Of course, in other embodiments, the second connection portion 242 may also be connected to one end of the first connection portion 241 in the second direction Z.

[0124] Optionally, the first connecting portion 241 and the second connecting portion 242 can be an integral structure or a separate structure. If the first connecting portion 241 and the second connecting portion 242 are an integral structure, the first connecting portion 241 and the second connecting portion 242 can be integrally manufactured by a process such as casting or stamping. If the first connecting portion 241 and the second connecting portion 242 are separate structures, the second connecting portion 242 can be connected to the first connecting portion 241 by welding or clamping. For example, in Figure 9, the first connecting portion 241 and the second connecting portion 242 are an integral structure.

[0125] The current collecting member 24 is provided with a first connecting portion 241 connected to the pole 23 and a second connecting portion 242 connected to the tab 222. This reduces interference between the area where the current collecting member 24 connects to the tab 222 and the area where the pole 23 connects. Furthermore, by connecting the portion of the first connecting portion 241 outside the slot 2511 to the pole 23, the area where the pole 23 and current collecting member 24 connect is closer to where the current collecting member 24 connects to the mounting bracket 25. This improves the stability and reliability of the assembly of the pole 23 and current collecting member 24, thereby enhancing the connection quality between the pole 23 and the current collecting member 24.

[0126] In some embodiments, the second connection portion 242 is located in the mounting hole 251. In other words, the entire second connection portion 242 is located in the mounting hole 251.

[0127] By disposing the second connection portion 242 as a whole in the mounting hole 251 , the second connection portion 242 is easily connected to the tab 222 of the electrode assembly 22 , and interference between the second connection portion 242 and the main body 221 of the electrode assembly 22 can be reduced.

[0128] In some embodiments, as shown in FIG. 4 , along the thickness direction X of the first wall, the tab 222 abuts against a side of the second connection portion 242 facing the main body 221 .

[0129] The tab 222 abuts against the side of the second connection part 242 facing the main body 221 , that is, after being connected to the second connection part 242 , the tab 222 can abut against the side of the second connection part 242 facing the main body 221 to support the second connection part 242 .

[0130] By abutting the pole ear 222 against the side of the second connecting portion 242 facing the main body 221 in the thickness direction X of the first wall, the pole ear 222 can play a certain supporting role on the second connecting portion 242, so that the pole ear 222 can play a certain supporting effect on the current collecting component 24 when the pole 23 is assembled and connected with the first connecting portion 241 of the current collecting component 24, thereby helping to further improve the stability of the current collecting component 24 connected to the mounting frame 25, so as to reduce the deformation of the current collecting component 24 when assembled with the pole 23, and thus effectively improve the connection quality between the pole 23 and the first connecting portion 241 of the current collecting component 24.

[0131] According to some embodiments of the present application, referring to FIG9 and further referring to FIG10 , FIG10 is a front view of the current collecting member 24 provided in some embodiments of the present application in the second direction Z. Along the thickness direction X of the first wall, the second connecting portion 242 is farther away from the main body 221 than the first connecting portion 241 .

[0132] Among them, the second connection part 242 is farther away from the main body 221 than the first connection part 241, that is, in the thickness direction X of the first wall, there is a distance between the surface of the second connection part 242 facing the main body 221 and the surface of the first connection part 241 facing the main body 221, and the surface of the second connection part 242 facing the main body 221 is farther away from the main body 221 than the surface of the first connection part 241 facing the main body 221, so that the surface of the second connection part 242 facing the main body 221 and the surface of the first connection part 241 facing the main body 221 form a stepped surface.

[0133] By setting the second connection part 242 of the current collecting component 24 to be farther away from the main body 221 than the first connection part 241 in the thickness direction X of the first wall, the current collecting component 24 can form a space for accommodating the pole ear 222 on the side of the second connection part 242 facing the main body 221, which helps to alleviate the phenomenon that the pole ear 222 is crushed by the second connection part 242.

[0134] According to some embodiments of the present application, as shown in Figures 4, 6, and 10, the battery cell 20 further includes a first insulating member 26. Along the thickness direction X of the first wall, the first insulating member 26 is disposed between the mounting bracket 25 and the first wall 2111 to insulate and isolate the current collecting member 24 from the first wall 2111. Along the thickness direction X of the first wall, the height of the pole 23 protruding from the surface of the first insulating member 26 facing the main body 221 is H1, and the height of the second connecting portion 242 protruding from the surface of the first connecting portion 241 facing away from the main body 221 is H2, satisfying H1 ≥ H2.

[0135] Among them, the height of the pole 23 protruding from the surface of the first insulating member 26 facing the main body 221 is H1, as shown in Figure 6, that is, the pole 23 has a portion extending from the surface of the first insulating member 26 facing the main body 221 in the thickness direction X of the first wall, and the size of this portion in the thickness direction X of the first wall is H1.

[0136] The height of the second connecting portion 242 protruding from the surface of the first connecting portion 241 away from the main body 221 is H2, as shown in Figure 10, that is, the second connecting portion 242 extends from the surface of the first wall 2111 away from the main body 221 in the thickness direction X of the first wall, and the dimension of the second connecting portion 242 extending from the surface of the first wall 2111 away from the main body 221 is H2.

[0137] In the thickness direction X of the first wall, by setting the size of the surface of the pole 23 extending out of the first insulating part 26 facing the main body 221 to be greater than or equal to the surface of the second connection part 242 protruding out of the first connection part 241 away from the main body 221, that is, when the electrode assembly 22 is assembled into the outer shell 21, the pole 23 will preferentially abut against the first connection part 241 of the current collecting member 24, so that there is a gap with a size greater than or equal to zero between the second connection part 242 and the first insulating part 26, which is beneficial to ensure the connection quality between the pole 23 and the first connection part 241, so as to alleviate the phenomenon of connection failure or incomplete connection due to the gap between the pole 23 and the first connection part 241.

[0138] In some embodiments, referring to FIG. 6 and FIG. 10 , along the thickness direction X of the first wall, the distance between the surface of the mounting bracket 25 facing away from the main body 221 and the surface of the first connecting portion 241 facing away from the main body 221 is H3, satisfying H1 ≥ H3.

[0139] Among them, the distance between the surface of the mounting frame 25 facing away from the main body 221 and the surface of the first connecting part 241 facing away from the main body 221 is H3, as shown in Figure 6, that is, after the current collecting component 24 is assembled into the mounting hole 251 of the mounting frame 25, the distance between the surface of the first connecting part 241 of the current collecting component 24 facing the first insulating part 26 and the surface of the mounting frame 25 facing the first insulating part 26 is H3.

[0140] In the thickness direction X of the first wall, by setting the distance between the surface of the mounting frame 25 facing away from the main body 221 and the surface of the first connecting portion 241 facing away from the main body 221 to be less than or equal to the dimension of the surface of the pole 23 extending from the surface of the first insulating member 26 facing the main body 221, that is, the dimension of the surface of the pole 23 extending from the surface of the first insulating member 26 facing the main body 221 is greater than or equal to the distance between the surface of the mounting frame 25 facing the first insulating member 26 and the surface of the first connecting portion 241 facing the first insulating member 26, when the electrode assembly 22 is assembled into the outer shell 21, the pole 23 will preferentially abut against the first connecting portion 241 of the current collecting member 24, so that there is a gap greater than or equal to zero between the mounting frame 25 and the first insulating member 26, which is beneficial to ensuring the connection quality between the pole 23 and the first connecting portion 241, and alleviating the phenomenon of connection failure or incomplete connection due to the gap between the pole 23 and the first connecting portion 241.

[0141] According to some embodiments of the present application, as shown in Figures 4, 7, and 9, there are two electrode assemblies 22, and the two electrode assemblies 22 are stacked along a first direction Y, which is perpendicular to the thickness direction X of the first wall. The current collecting member 24 includes two second connecting portions 242, which are respectively connected to both sides of the first connecting portion 241 along the first direction Y, and the two second connecting portions 242 are respectively connected to the tabs 222 of the two electrode assemblies 22.

[0142] Among them, the two second connecting parts 242 are respectively connected to the pole ears 222 of the two electrode assemblies 22, that is, the two pole ears 222 of the two electrode assemblies 22 with the same polarity are respectively connected to the two second connecting parts 242 of the current collecting component 24, so as to achieve that the two pole ears 222 of the two electrode assemblies 22 with the same polarity are electrically connected to one current collecting component 24.

[0143] It should be noted that in other embodiments, only one electrode assembly 22 may be provided, and correspondingly, only one second connection portion 242 may be provided on the current collecting member 24. Of course, three, four, or five electrode assemblies 22 may also be provided, and correspondingly, the second connection portions 242 of the current collecting member 24 are provided in a one-to-one correspondence with the electrode assemblies 22.

[0144] By setting two electrode assemblies 22 housed in the outer shell 21, and the two electrode assemblies 22 are arranged along the first direction Y, correspondingly, two second connecting portions 242 are provided on the current collecting component 24, and the two second connecting portions 242 are respectively connected to the two sides of the first connecting portion 241 in the first direction Y, so that the current collecting component 24 can be simultaneously connected to the pole ears 222 of the two electrode assemblies 22 to realize parallel connection between the two electrode assemblies 22.

[0145] In some embodiments, referring to FIG. 7 and further referring to FIG. 11 , which is a top view of a current collecting member 24 connected to a mounting bracket 25 according to some embodiments of the present application, the mounting hole 251 has a dimension W1 in the first direction Y, and the distance between the outer edges of the two second connecting portions 242 facing away from each other in the first direction Y is W2, satisfying W1>W2.

[0146] The shape of the mounting hole 251 is rectangular, and the size of the mounting hole 251 in the first direction Y is W1, that is, the width of the mounting hole 251 is W1.

[0147] A distance between outer edges of the two second connection portions 242 that are away from each other in the first direction Y is W2 , that is, a maximum dimension of the current collecting member 24 in the first direction Y is W2 .

[0148] By setting the distance between the outer edges of the two second connecting parts 242 that are away from each other in the first direction Y to be smaller than the size of the mounting hole 251 in the first direction Y, that is, the size of the current collecting component 24 in the first direction Y is smaller than the size of the mounting hole 251, it is beneficial to ensure that the current collecting component 24 is assembled into the mounting hole 251 in the first direction Y, so as to reduce the interference between the current collecting component 24 and the hole wall surface of the mounting hole 251 in the first direction Y.

[0149] In some embodiments, referring to FIG11 , one end of the first connection portion 241 in the second direction Z is inserted into the slot 2511 , the dimension of the mounting hole 251 in the second direction Z is L1, and the dimension of the second connection portion 242 in the second direction Z is L2, satisfying that L1>L2, and the first direction Y, the second direction Z and the thickness direction X of the first wall are perpendicular to each other.

[0150] The dimension of the mounting hole 251 in the second direction Z is L1 , that is, the length of the mounting hole 251 is L1 .

[0151] The dimension of the second connection portion 242 in the second direction Z is L2 , that is, the second connection portion 242 extends along the second direction Z, and the length of the second connection portion 242 in the second direction Z is L2 .

[0152] By setting the size of the second connection part 242 in the second direction Z to be smaller than the size of the mounting hole 251, the second connection part 242 can be assembled into the mounting hole 251 after the first connection part 241 is inserted into the groove along the second direction Z, so as to reduce the interference between the second connection part 242 and the hole wall surface of the mounting hole 251 in the second direction Z.

[0153] According to some embodiments of the present application, as shown in Figures 4 and 7 , there are two current collecting members 24 and two poles 23, and the mounting frame 25 is provided with two mounting holes 251. There is a one-to-one correspondence between the current collecting members 24, the mounting holes 251, and the poles 23. The electrode assembly 22 has two tabs 222 with opposite polarities, and the two tabs 222 are respectively connected to the two current collecting members 24.

[0154] The electrode assembly 22 has two tabs 222 with opposite polarities, and the two tabs 222 are used to output or input the positive electrode and the negative electrode of the electrode assembly 22 respectively.

[0155] There are two current collecting components 24 and two poles 23 . The current collecting components 24 , the mounting holes 251 and the poles 23 correspond one to one. The two pole tabs 222 are respectively connected to the two current collecting components 24 . That is, the two current collecting components 24 and the two poles 23 serve as the positive output pole and the negative output pole of the battery cell 20 , respectively.

[0156] For example, in FIG. 7 , the two mounting holes 251 are arranged along the second direction Z, and correspondingly, the two current collecting members 24 are arranged at intervals and opposite to each other along the second direction Z, so as to facilitate the assembly of the current collecting members 24 and the assembly connection between the current collecting members 24 and the tabs 222 .

[0157] By providing two current collecting components 24 and two mounting holes 251 on the mounting frame 25 , and assembling each current collecting component 24 into one mounting hole 251 , the mounting frame 25 can simultaneously stabilize two current collecting components 24 with opposite polarities, so as to facilitate assembly of the two current collecting components 24 with the two poles 23 .

[0158] According to some embodiments of the present application, referring to Figures 6 and 7 , and further referring to Figure 12 , Figure 12 is a front view of a mounting bracket 25 provided in some embodiments of the present application in a first direction Y. Along the thickness direction X of the first wall, the mounting bracket 25 has a first surface 252 facing the main body 221 , and the first surface 252 abuts against the main body 221 .

[0159] The mounting frame 25 has a first surface 252 facing the main body 221 . The first surface 252 abuts against the main body 221 , that is, the mounting frame 25 abuts against the main body 221 of the electrode assembly 22 in the thickness direction X of the first wall.

[0160] By placing the first surface 252 of the mounting frame 25 facing the main body 221 against the main body 221 of the electrode assembly 22, the main body 221 can provide support for the mounting frame 25, thereby improving the structural stability of the mounting frame 25 assembled between the main body 221 and the first wall 2111, further alleviating the shaking or displacement of the current collecting component 24 in the outer shell 21, and further helping to further improve the connection quality between the current collecting component 24 and the pole 23.

[0161] According to some embodiments of the present application, referring to FIG. 8 and FIG. 12 , an avoidance groove 2521 is provided on the first surface 252 , and the avoidance groove 2521 is used to accommodate the tab 222 .

[0162] Among them, an avoidance groove 2521 is provided on the first surface 252, that is, the surface of the mounting frame 25 that abuts against the main body 221 of the electrode assembly 22 in the thickness direction X of the first wall is provided with an avoidance groove 2521, so that the pole ear 222 can be accommodated in the avoidance groove 2521 to avoid the pole ear 222.

[0163] Exemplarily, the electrode assembly 22 has two pole ears 222 with opposite polarities, and the two pole ears 222 are spaced apart along the second direction Z. Correspondingly, two avoidance grooves 2521 are provided on the first surface 252 of the mounting frame 25, and the two avoidance grooves 2521 are spaced apart along the second direction Z.

[0164] In some embodiments, as shown in FIG12 , the thickness of the mounting frame 25 in the thickness direction X of the first wall is D, satisfying the condition 1 mm ≤ D ≤ 10 mm. Setting the thickness of the mounting frame 25 between 1 mm and 10 mm can, on the one hand, alleviate the problem of insufficient structural strength of the mounting frame 25 due to an excessively thin mounting frame 25 , thereby reducing the risk of the mounting frame 25 breaking during assembly or use and improving the support and stability of the current collecting member 24 . On the other hand, it can alleviate the problem of the mounting frame 25 occupying excessive internal space of the battery cell 20 due to an excessive thickness of the mounting frame 25 , thereby improving the energy density of the battery cell 20.

[0165] The thickness of the mounting frame 25 in the thickness direction X of the first wall is D, that is, in the thickness direction X of the first wall, the distance between the first surface 252 of the mounting frame 25 and the surface of the mounting frame 25 away from the main body 221 is D.

[0166] For example, the thickness D of the mounting frame 25 in the thickness direction X of the first wall may be 1 mm, 1.5 mm, 2 mm, 3 mm, 5 mm, 8 mm, or 10 mm.

[0167] By providing an avoidance groove 2521 for accommodating the tab 222 on the first surface 252 of the mounting frame 25 facing the main body 221 , the extrusion of the tab 222 by the mounting frame 25 is reduced, thereby helping to reduce the risk of the tab 222 being damaged or inserted upside down into the main body 221 .

[0168] According to some embodiments of the present application, as shown in Figures 3, 4, and 5, the housing 21 may include a shell 211 and an end cap 212. The shell 211 has an interior formed with a receiving cavity 2112 having an opening 2113. The electrode assembly 22 is received in the receiving cavity 2112, and the end cap 212 covers the opening 2113. The shell 211 includes a first wall 2111.

[0169] In which, the shell 211 includes a first wall 2111, that is, the first wall 2111 is a wall of the shell 211. The first wall 2111 can be a wall of the shell 211 opposite to the end cover 212 in the thickness direction X of the first wall, or it can be a wall adjacent to and abutting the shell 211 and the end cover 212, that is, the pole 23 is installed on the shell 211.

[0170] For example, in FIG. 4 and FIG. 5 , the first wall 2111 and the end cover 212 are disposed opposite to each other in the thickness direction X of the first wall.

[0171] The shell 211 includes a first wall 2111, that is, the pole 23 is installed on the shell 211, so that after the current collecting component 24 connects the pole 23 and the pole ear 222 of the electrode assembly 22, the electrode assembly 22 can be electrically connected to the pole 23, so as to realize the input or output of electrical energy of the battery cell 20. The battery cell 20 with this structure can alleviate the phenomenon that the force is transferred to the shell 211 and the end cover 212 through the pole 23 when the current collecting component pulls or twists the pole 23 during use, thereby effectively alleviating the pulling between the end cover 212 and the shell 211, so as to reduce the risk of leakage caused by connection failure between the end cover 212 and the shell 211, which is beneficial to improving the safety and service life of the battery cell 20.

[0172] In some embodiments, as shown in Figures 4, 5, and 6, the housing 211 further includes a second wall 2114. The second wall 2114 is disposed around the first wall 2111. Along the thickness direction X of the first wall, one end of the second wall 2114 is connected to the first wall 2111, and the other end forms an opening 2113. The second wall 2114 and the first wall 2111 jointly define a receiving cavity 2112. The first wall 2111 is disposed opposite the end cover 212.

[0173] Among them, the second wall 2114 is a hollow structure with both ends open in the thickness direction X of the first wall, so that one end of the second wall 2114 in the thickness direction X of the first wall is enclosed to form an opening 2113, and the other end is connected to the first wall 2111 to jointly define a accommodating cavity 2112 for accommodating the electrode assembly 22.

[0174] The end cover 212 covers the opening 2113 formed by the second wall 2114, and the end cover 212 and the first wall 2111 are arranged opposite to each other in the thickness direction X of the first wall. This structure can make the first wall 2111 equipped with the pole 23 away from the end cover 212 of the shell 21, so that there is no direct connection between the first wall 2111 and the end cover 212, thereby further reducing the force generated by the pulling or twisting of the pole 23 by the confluence component on the end cover 212, thereby reducing the risk of connection failure between the end cover 212 and the shell 211, and further helping to further reduce the risk of leakage of the battery cell 20 during use.

[0175] According to some embodiments of the present application, the housing 211 is integrally formed, that is, the first wall 2111 and the second wall 2114 of the housing 211 are integrally formed.

[0176] For example, the housing 211 may be integrally manufactured by using a casting, stamping or other process.

[0177] The shell 211 is an integrally molded structure. The shell 211 with this structure can improve the structural strength of the shell 211 itself, so as to alleviate the phenomenon that when the busbar component pulls or twists the pole 23, the force is transferred to the shell 211 through the pole 23, causing cracks in the shell 211. This can effectively reduce the risk of leakage of the battery cell 20 during use, which is beneficial to improving the safety and service life of the battery cell 20.

[0178] According to some embodiments of the present application, as shown in Figures 4, 5, and 6, the battery cell 20 further includes a first insulating member 26. The first insulating member 26 is disposed between the mounting frame 25 and the first wall 2111 along the thickness direction X of the first wall to insulate and isolate the current collecting member 24 from the first wall 2111.

[0179] The first insulating member 26 is disposed between the mounting frame 25 and the first wall 2111 of the housing 211 in the thickness direction X of the first wall to insulate the current collecting member 24 from the first wall 2111. The first insulating member 26 can be made of various materials, such as rubber, plastic, or silicone.

[0180] A first insulating member 26 is further provided between the mounting frame 25 and the first wall 2111 , so that the first insulating member 26 can insulate and isolate the current collecting member 24 and the first wall 2111 , thereby effectively reducing the risk of short circuit between the current collecting member 24 and the first wall 2111 and improving the safety of the battery cell 20 .

[0181] According to some embodiments of the present application, the present application further provides a battery 100 comprising the battery cell 20 of any of the above solutions.

[0182] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 100 of any of the above solutions, and the battery 100 is used to provide electrical energy to the electrical device.

[0183] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0184] According to some embodiments of the present application, referring to Figures 3 to 12 , the present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, a terminal post 23, a mounting bracket 25, a current collecting member 24, and a first insulating member 26. The housing 21 includes a shell 211, which has a first wall 2111 and a second wall 2114. The second wall 2114 is disposed around the first wall 2111. Along the thickness direction X of the first wall, one end of the second wall 2114 is connected to the first wall 2111, and the other end forms an opening 2113. The second wall 2114 and the first wall 2111 jointly define a receiving cavity 2112. The end cap 212 covers the opening 2113. The end cap 212 and the first wall 2111 are disposed opposite each other along the thickness direction X of the first wall. The electrode assembly 22 is housed within the accommodating cavity 2112 and includes a main body 221 and a tab 222. The tab 222 is located at the end of the main body 221 facing the first wall 2111, along the thickness direction X of the first wall. Two electrode assemblies 22 are provided, with the main bodies 221 of the two electrode assemblies 22 stacked along the first direction Y. The electrode post 23 is mounted on the first wall 2111. A mounting bracket 25 is located between the first wall 2111 and the main body 221, along the thickness direction X of the first wall. The mounting bracket 25 has a mounting hole 251 extending through the mounting bracket 25, and a slot 2511 is provided on the wall of the mounting hole 251. Along the thickness direction X of the first wall, the mounting bracket 25 has a first surface 252 facing the main body 221. The first surface 252 abuts the main body 221 and is provided with a relief groove 2521 for accommodating the tab 222. The current collecting member 24 includes a first connecting portion 241 and two second connecting portions 242 connected to either side of the first connecting portion 241 in the first direction Y. A portion of the first connecting portion 241 is inserted into the slot 2511, while the portion of the first connecting portion 241 outside the slot 2511 is connected to the electrode post 23. The two second connecting portions 242 are respectively connected to the tabs 222 of the two electrode assemblies 22. Both second connecting portions 242 are located within the mounting hole 251. Along the thickness direction X of the first wall, the tabs 222 abut against the sides of the second connecting portions 242 facing the main body 221. The mounting frame 25 is injection molded so that the first connecting portion 241 is connected to the wall of the slot 2511. A first insulating member 26 is disposed between the mounting frame 25 and the first wall 2111 along the thickness direction X of the first wall to insulate and isolate the current collecting member 24 from the first wall 2111.

[0185] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0186] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, comprising: a housing having a first wall; an electrode assembly housed in the housing, the electrode assembly comprising a main body and a tab, wherein the tab is disposed at one end of the main body facing the first wall along the thickness direction of the first wall; a pole, mounted on the first wall; A current collecting component, connecting the pole and the tab; as well as A mounting frame is provided between the first wall and the main body along the thickness direction of the first wall, and the current collecting component is connected to the mounting frame.

2. The battery cell according to claim 1, wherein: The mounting frame is provided with a mounting hole, and the mounting hole passes through the mounting frame along the thickness direction of the first wall; Wherein, at least a portion of the current collecting component is accommodated in the mounting hole.

3. The battery cell according to claim 2, wherein: A slot is provided on the wall surface of the mounting hole, and the current collecting component includes a first connecting portion, at least a portion of which is inserted into the slot.

4. The battery cell according to claim 3, wherein: The mounting frame is injection molded so that the first connecting portion is connected to the slot wall surface of the slot.

5. The battery cell according to claim 3 or 4, wherein: The current collecting component further includes: a second connecting portion connected to the first connecting portion, wherein the second connecting portion is connected to the tab; Part of the first connecting portion is inserted into the slot, and the part of the first connecting portion located outside the slot is connected to the pole. The battery cell according to claim 5 , wherein: The second connecting portion is located in the mounting hole.

7. The battery cell according to claim 5 or 6, wherein: Along the thickness direction of the first wall, the tab abuts against a side of the second connecting portion facing the main body.

8. The battery cell according to any one of claims 5 to 7, wherein: Along the thickness direction of the first wall, the second connection portion is farther away from the main body portion than the first connection portion.

9. The battery cell according to claim 8, wherein: The battery cell further comprises: a first insulating member disposed between the mounting frame and the first wall along a thickness direction of the first wall to insulate and isolate the current collecting member from the first wall; In which, along the thickness direction of the first wall, the height of the pole protruding from the surface of the first insulating member facing the main body is H1, and the height of the second connecting portion protruding from the surface of the first connecting portion away from the main body is H2, satisfying H1≥H2.

10. The battery cell according to claim 9, wherein: Along the thickness direction of the first wall, a distance between a surface of the mounting bracket facing away from the main body and a surface of the first connecting portion facing away from the main body is H3, satisfying H1 ≥ H3.

11. The battery cell according to any one of claims 5 to 10, wherein: There are two electrode assemblies, and the two electrode assemblies are stacked along a first direction, and the first direction is perpendicular to the thickness direction of the first wall; The current collecting member includes two second connecting portions, and along the first direction, the two second connecting portions are respectively connected to both sides of the first connecting portion, and the two second connecting portions are respectively connected to the tabs of the two electrode assemblies.

12. The battery cell according to claim 11, wherein: The size of the mounting hole in the first direction is W1, and the distance between outer edges of the two second connection portions facing away from each other in the first direction is W2, satisfying W1>W2.

13. The battery cell according to claim 11 or 12, wherein: One end of the first connecting portion in the second direction is inserted into the slot, the size of the mounting hole in the second direction is L1, and the size of the second connecting portion in the second direction is L2, satisfying L1>L2, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

14. The battery cell according to any one of claims 2 to 13, wherein: There are two current collecting members and two poles, the mounting frame is provided with two mounting holes, and the current collecting members, the mounting holes and the poles correspond one to one; The electrode assembly has two electrode tabs with opposite polarities, and the two electrode tabs are respectively connected to the two current collecting members.

15. The battery cell according to any one of claims 1 to 14, wherein: The mounting bracket has a first surface facing the main body along a thickness direction of the first wall, and the first surface abuts against the main body.

16. The battery cell according to claim 15, wherein: An escape groove is provided on the first surface, and the escape groove is used to accommodate the tab.

17. The battery cell according to any one of claims 1 to 16, wherein: The housing comprises: A housing having an opening formed therein, wherein the electrode assembly is accommodated in the housing; an end cover, covering the opening; Wherein, the shell includes the first wall.

18. The battery cell according to claim 17, wherein: The shell is integrally formed.

19. The battery cell according to claim 17 or 18, wherein: The housing further comprises: The second wall is arranged around the first wall. Along the thickness direction of the first wall, one end of the second wall is connected to the first wall, and the other end forms the opening. The second wall and the first wall jointly define the accommodating cavity, and the first wall is arranged opposite to the end cover.

20. The battery cell according to any one of claims 1 to 19, wherein: The battery cell further comprises: A first insulating member is provided between the mounting frame and the first wall along a thickness direction of the first wall to insulate and isolate the current collecting member from the first wall.

21. A battery comprising the battery cell according to any one of claims 1 to 20.

22. An electrical device comprising the battery according to claim 21.

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