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 first insulating part and a support frame, the shell is provided with a first wall, and the electrode assembly is contained in the shell and comprises a main body part. The first insulator is disposed on a side of the first wall facing the electrode assembly in a thickness direction of the first wall. The supporting frame is arranged between the main body part and the first insulating part in the thickness direction of the first wall, and the supporting frame is connected with the first insulating part in a hot melting mode. According to the battery monomer with the structure, the support frame can be fixed on the first insulating part so as to fasten the support frame in the shell, so that the phenomenon of movement or displacement of the support frame in the use process is reduced, the risk that the electrode assembly is damaged due to movement or displacement of the support frame can be reduced, the use stability and reliability of the battery monomer are improved, and the service life of the battery monomer is prolonged. And the use safety and the service life of the battery monomer are 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, as the power source of electric vehicles, play an irreplaceable and important role. 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 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, which is then loaded into the outer shell and finally injected with the electrolyte. However, the electrode assembly of the existing battery cells is often damaged during use, which easily causes the risk of short circuit of the battery cell, and leads to poor stability in the use of the battery cell, which is not conducive to improving the safety and service life 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 safety and service life 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 first insulating member and a support frame; the shell has a first wall; the electrode assembly is accommodated in the shell, and the electrode assembly comprises a main body; along the thickness direction of the first wall, the first insulating member is arranged on the side of the first wall facing the electrode assembly; along the thickness direction of the first wall, the support frame is arranged between the main body and the first insulating member, and the support frame is thermally melted to the first insulating member.

[0006] In the above technical solution, a first insulating member for insulating and isolating the electrode assembly and the first wall is provided in the outer shell, and the support frame is connected to the first insulating member by a hot melt connection, so that the support frame can be fixed on the first insulating member to fasten the support frame in the outer shell. The battery cell adopting this structure can reduce the phenomenon of the support frame moving or shifting during use, thereby reducing the risk of the support frame damaging the electrode assembly due to moving or shifting, thereby improving the stability and reliability of the battery cell, and further helping to improve the safety and service life of the battery cell. In addition, the support frame is fixed to the first insulating member by a hot melt connection. On the one hand, it can improve the connection firmness between the support frame and the first insulating member, so as to reduce the risk of separation between the support frame and the first insulating member during use. On the other hand, it is convenient to fix the support frame on the first insulating member, which helps to reduce the difficulty of assembly.

[0007] In some embodiments, the support frame has a first connecting part, the first insulating member has a second connecting part, the first connecting part and the second connecting part are hot-melt connected, the transmittance of the first connecting part is T1, and the transmittance of the second connecting part is T2, satisfying T1>T2.

[0008] In the above technical solution, the first connecting portion of the support frame and the second connecting portion of the first insulating member are heat-melted to each other to achieve the fixation of the support frame on the first insulating member. By setting the transmittance of the first connecting portion to be greater than the transmittance of the second connecting portion, on the one hand, the first connecting portion and the second connecting portion with different transmittances can be heat-melted to each other by laser welding, which is conducive to reducing the difficulty of assembling the support frame and the first insulating member. On the other hand, during the assembly process of the battery cell, the laser can enter from the side of the support frame facing the main body and penetrate the support frame and then act on the contact surface of the first connecting portion and the second connecting portion to achieve laser heat-melting connection between the first connecting portion and the second connecting portion, which is conducive to reducing the difficulty of laser welding assembly between the support frame and the first insulating member, thereby improving the production efficiency of the battery cell. It is also convenient for the laser to pass through the first connecting portion of the support frame and melt the contact surface of the second connecting portion of the first insulating member and the first connecting portion of the support frame, so that the second connecting portion of the first insulating member and the first connecting portion of the support frame are melted to each other, thereby effectively ensuring the connection quality between the first insulating member and the support frame, which is conducive to improving the stability and reliability of the connection between the first insulating member and the support frame.

[0009] In some embodiments, 40%≤T1≤99%.

[0010] In the above technical solution, by setting the transmittance of the first connection part of the support frame to 40% to 99%, the transmittance effect of the first connection part can be effectively guaranteed, so as to alleviate the phenomenon that the laser cannot effectively penetrate the first connection part due to the low transmittance of the first connection part, resulting in the first connection part and the second connection part of the first insulating part cannot be welded. It is convenient for the laser to melt the contact surface of the first connection part and the second connection part after passing through the first connection part, so that the first insulating part and the support frame are melted and connected to each other, which is beneficial to ensure the connection quality between the first insulating part and the support frame.

[0011] In some embodiments, 60%≤T1≤99%.

[0012] In the above technical solution, by further setting the transmittance of the first connection part of the support frame to 60% to 99%, the transmittance effect of the first connection part can be further improved, so as to further improve the quality of the laser hot melt connection between the first connection part and the second connection part, which is beneficial to further improve the welding strength between the first connection part and the second connection part.

[0013] In some embodiments, 0%≤T2≤10%.

[0014] In the above technical solution, by setting the transmittance of the first insulating part to 0% to 10%, the transmittance effect of the second connecting part of the first insulating part is reduced, thereby effectively alleviating the phenomenon that the laser cannot melt the contact surface between the second connecting part and the first connecting part after passing through the second connecting part due to the excessive transmittance of the second connecting part, so that the laser can be concentrated on the contact surface between the first insulating part and the support frame, which is beneficial to ensuring the connection quality between the first insulating part and the support frame, and is beneficial to reducing the risk of damage to other components of the battery cell after the laser passes through the first insulating part, so as to ensure the production quality of the battery cell.

[0015] In some embodiments, along the thickness direction of the first wall, the first connecting portion and the second connecting portion are stacked and connected by heat melting.

[0016] In the above technical solution, a fixed connection between the support frame and the first insulating member can be achieved by stacking the first connecting portion and the second connecting portion on each other and hot-melt-connecting them. On the one hand, the battery cell with such a structure is easy to assemble, which helps to reduce the difficulty of assembling between the support frame and the first insulating member. On the other hand, stacking the first connecting portion and the second connecting portion on each other and then hot-melt-connecting them helps to improve the assembly quality between the support frame and the first insulating member, thereby improving the connection stability and reliability between the support frame and the first insulating member.

[0017] In some embodiments, along the thickness direction of the first wall, the thickness of the first connecting portion is D1, satisfying 0.5 mm ≤ D1 ≤ 2.5 mm.

[0018] In the above technical solution, by setting the thickness of the first connection part to 0.5mm to 2.5mm, on the one hand, the phenomenon of insufficient structural strength of the first connection part caused by the thickness of the first connection part being too small can be alleviated, so as to reduce the deformation of the first connection part during the hot-melt connection with the second connection part, thereby effectively reducing the risk of gaps or connection failure between the first connection part and the second connection part, which is beneficial to improving the connection quality and connection stability between the first connection part and the second connection part. On the other hand, it can alleviate the phenomenon of material waste or excessive assembly difficulty caused by the thickness of the first connection part being too large, thereby helping to reduce the manufacturing cost of the battery cell.

[0019] In some embodiments, along the thickness direction of the first wall, the thickness of the second connecting portion is D2, satisfying 0.5 mm ≤ D2 ≤ 2.5 mm.

[0020] In the above technical solution, by setting the thickness of the second connection part to 0.5mm to 2.5mm, on the one hand, the phenomenon of insufficient structural strength of the second connection part caused by the thinness of the second connection part can be alleviated, so as to reduce the deformation of the second connection part during the hot-melt connection with the first connection part, thereby effectively reducing the risk of gap or connection failure between the second connection part and the first connection part, which is beneficial to improving the connection quality and connection stability between the second connection part and the first connection part. On the other hand, it can alleviate the phenomenon of material waste or excessive assembly difficulty caused by the excessive thickness of the second connection part, thereby helping to reduce the manufacturing cost of the battery cell.

[0021] In some embodiments, the support frame further includes a main body portion, and the first connecting portion protrudes from one end of the main body portion along a first direction, and the first direction is perpendicular to a thickness direction of the first wall.

[0022] In the above technical solution, the support frame is also provided with a main body portion, and the first connecting portion is a portion of the support frame protruding from one end of the main body portion in the first direction, that is, the first connecting portion of the support frame used to be connected to the first insulating member is located at one end of the support frame in the first direction. A support frame adopting such a structure can effectively avoid other components of the battery cell, so as to facilitate the assembly of the support frame and the first insulating member, which is conducive to reducing the difficulty of assembly.

[0023] In some embodiments, along the first direction, both ends of the main body are provided with protruding first connection parts, and the first connection parts are provided in a one-to-one correspondence with the second connection parts.

[0024] In the above technical solution, the main body of the support frame is provided with a first connecting portion at both ends in the first direction, and the first insulating member is correspondingly provided with two second connecting portions, so that both ends of the support frame in the first direction can be fixed on the first insulating member, which is beneficial to further improve the stability and reliability of the support frame connected to the first insulating member, so as to reduce the risk of the support frame and the first insulating member falling off during use.

[0025] In some embodiments, the first insulating member includes an insulating body and a protrusion; along the thickness direction of the first wall, the insulating body is arranged on the side of the first wall facing the electrode assembly; the protrusion is protruded on the side of the insulating body facing the electrode assembly, and the protrusion has the second connecting portion.

[0026] In the above technical solution, the first insulating part is provided with an insulating body and a protrusion protruding from the insulating body, and the protrusion has a second connecting portion, that is, the first connecting portion of the support frame is connected to the protrusion of the first insulating part. The first insulating part with such a structure facilitates the assembly of the first insulating part and the support frame, which is beneficial to reducing the difficulty of connection between the first connecting portion and the second connecting portion.

[0027] In some embodiments, along the thickness direction of the first wall, the protrusion has a first surface facing the electrode assembly, the first surface is provided with a first groove, and the first connecting portion is against the bottom surface of the first groove; the insulating body has a second surface against the first wall, the second surface is provided with a second groove, and the portion of the protrusion located between the bottom surface of the first groove and the bottom surface of the second groove forms the second connecting portion.

[0028] In the above technical solution, by providing a first groove on the first surface of the protrusion and a second groove on the second surface of the insulating body, the portion of the protrusion between the bottom surfaces of the first groove and the second groove forms a second connection portion for heat-melting connection with the first connection portion. The first insulating member with this structure can thin the thickness of the second connection portion while ensuring the structural strength of the protrusion, thereby facilitating control of the thickness of the second connection portion and improving the connection quality between the second connection portion and the first connection portion. In addition, after the first connection portion abuts against the bottom surface of the first groove and heat-melts with the second connection portion, the first groove can accommodate at least a portion of the first connection portion, thereby providing a certain degree of protection for the first connection portion and reducing wear of the first connection portion during assembly or use.

[0029] In some embodiments, the first insulating member includes an insulating body and two protrusions; along the thickness direction of the first wall, the insulating body is arranged on the side of the first wall facing the electrode assembly; the two protrusions are protruded on the side of the insulating body facing the electrode assembly, and along the first direction, the two protrusions are spaced apart, and an accommodating space is formed between the two protrusions, and the accommodating space is used to accommodate at least part of the support frame, and the first direction is perpendicular to the thickness direction of the first wall.

[0030] In the above technical solution, by accommodating at least part of the support frame in the accommodating space formed between the two protrusions of the first insulating member, the support frame can be limited and positioned to a certain extent. On the one hand, it is convenient for assembling the support frame and can provide a certain protection for the support frame. On the other hand, it can further reduce the movement of the support frame during the assembly or use of the battery cell, thereby reducing the risk of the support frame damaging the electrode assembly due to movement, which is beneficial to improving the safety and service life of the battery cell.

[0031] In some embodiments, along the thickness direction of the first wall, the protrusion has a first surface facing the main body, and the support frame does not extend beyond the first surface.

[0032] In the above technical solution, the support frame is arranged so as not to exceed the first surface of the protrusion in the thickness direction of the first wall, that is, the entire support frame is accommodated in the accommodating space, so that on the one hand, the limiting effect of the first insulating member on the support frame can be improved, and it is beneficial to improve the protection effect of the first insulating member on the support frame. On the other hand, it can save the space occupied by the first insulating member and the support frame, which is beneficial to optimize the internal space of the battery cell and improve the internal space utilization rate of the battery cell.

[0033] In some embodiments, the support frame includes a main body and a first connecting part, the main body is accommodated in the accommodating space, and along the first direction, the first connecting part protrudes from at least one end of the main body; along the thickness direction of the first wall, the protrusion has a first surface facing the main body, and the first surface is provided with a first groove, along the first direction, the first groove passes through the protrusion and is connected to the accommodating space, the first connecting part extends into the first groove, and the first connecting part is hot-melt connected to the bottom surface of the first groove.

[0034] In the above technical solution, a first groove is provided on the first surface of the protrusion facing the main body, and the first groove penetrates the protrusion along the first direction and is connected to the accommodating space, so that the protrusion is a stepped structure, so that the main body of the support frame is accommodated in the accommodating space, and the first connecting part of the support frame is provided to extend into the first groove, and the first connecting part is abutted against and hot-melt connected to the bottom surface of the groove of the first groove, so that the protrusion can play a certain limiting and positioning role on the support frame in the thickness direction of the first wall, so as to improve the assembly quality between the support frame and the first insulating member, and facilitate the hot-melt connection between the support frame and the first insulating member, which is conducive to reducing the difficulty of assembly.

[0035] In some embodiments, the first connection portion is spaced apart from the groove side surface of the first groove, and the distance between the first connection portion and the groove side surface of the first groove is L, which satisfies 0.8 mm ≤ L ≤ 2 mm.

[0036] In the above technical solution, by setting the distance between the first connecting portion of the support frame and the groove side of the first groove to 0.8mm to 2mm, on the one hand, it can alleviate the phenomenon that the distance between the first connecting portion accommodated in the first groove and the groove side of the first groove is too small, resulting in excessive difficulty in assembling the support frame into the accommodating space and the first groove, and the assembly accuracy requirement is too high, thereby helping to reduce the assembly difficulty between the support frame and the first insulating member to improve assembly efficiency. On the other hand, it can alleviate the phenomenon that the distance between the first connecting portion of the support frame and the groove side of the first groove is too large, resulting in poor limiting and positioning effect of the first groove on the support frame.

[0037] In some embodiments, the battery cell further includes an electrode terminal; the electrode terminal is disposed on the first wall; the electrode assembly further includes a pole ear, which is protruded from one end of the main body facing the first wall along the thickness direction of the first wall, the pole ear is bent around the support frame, and the pole ear is connected to the electrode terminal.

[0038] In the above technical solution, an electrode terminal is provided on the first wall of the shell, and a tab is provided on one end of the main body facing the first wall. By setting the tab to bend around the support frame and then connected to the electrode terminal, the electrode assembly and the electrode terminal are electrically connected, thereby enabling the input or output of electrical energy of the battery cell. The battery cell adopting this structure makes the portion where the tab is connected to the electrode terminal located on the side of the support frame away from the main body, thereby effectively alleviating the phenomenon of the tab being inserted upside down into the main body of the electrode assembly during assembly or use, which is beneficial to reducing the risk of short circuit of the battery cell and improving the safety of the battery cell. In addition, since the support frame is hot-melt-connected to the first insulating member, it is possible to effectively reduce the phenomenon of the support frame moving or shifting during the use of the battery cell, thereby effectively reducing the risk of the support frame destroying the shape of the tab or damaging the tab due to movement, thereby alleviating the phenomenon of the tab short-circuiting with other components or the connection failure between the electrode assembly and the electrode terminal, thereby improving the safety and service life of the battery cell.

[0039] In some embodiments, the battery cell further includes a current collecting member; along a thickness direction of the first wall, the current collecting member is disposed between the first insulating member and the support frame, and the current collecting member connects the electrode terminal and the tab.

[0040] In the above technical solution, a current collecting component is also provided in the battery cell. By connecting the current collecting component to the electrode terminal and arranging the current collecting component between the first insulating member and the support frame, the current collecting component is connected to the electrode terminal and the electrode tab of the electrode assembly, thereby realizing electrical connection between the electrode assembly and the electrode terminal to output or input electrical energy of the battery cell. This structure facilitates connecting the tab to the current collecting component, which is beneficial to reducing the difficulty of assembly between the tab and the electrode terminal.

[0041] In some embodiments, the housing includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the electrode assembly is received in the receiving cavity; the end cover closes the opening; wherein the end cover is the first wall.

[0042] In the above technical solution, the first wall of the shell is an end cover for closing the opening of the shell. The battery cell adopting this structure is convenient for assembling the support frame and the first insulating member, and is conducive to reducing the difficulty of assembling the first insulating member into the shell and between the support frame and the first insulating member, thereby helping to improve the production efficiency of the battery cell.

[0043] In some embodiments, the outer shell includes a shell and an end cover; the shell includes an integrally formed side wall and the first wall, the side wall is arranged around the first wall, and along the thickness direction of the first wall, one end of the side wall is connected to the first wall, and the other end is enclosed to form an opening, and the side wall and the first wall jointly define a accommodating cavity for accommodating the electrode assembly; the end cover closes the opening.

[0044] In the above technical solution, the first wall is a wall of the shell that is arranged opposite to the end cover in the thickness direction of the first wall. The battery cell using this structure can make the first insulating part, the support frame and other components away from the end cover, and there is no direct connection between the first wall and the end cover, so that the force generated by the pulling or twisting of the first wall by the first insulating part, the support frame and other components can act on the end cover, thereby reducing the risk of connection failure between the end cover and the shell, which is conducive to further reducing the risk of leakage of the battery cell during use.

[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 partial 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 structural diagram of a support frame for a battery cell provided in some embodiments of the present application;

[0055] FIG8 is a schematic structural diagram of a first insulating member of a battery cell provided in some embodiments of the present application;

[0056] FIG9 is a schematic diagram of the connection between the support frame and the first insulating member provided in some embodiments of the present application;

[0057] FIG10 is a bottom view of the support frame connected to the first insulating member provided in some embodiments of the present application.

[0058] Icon: 1000-Vehicle; 100-Battery; 10-Box; 11-First Box Body; 12-Second Box Body; 20-Battery Cell; 21-Casing; 211-First Wall; 2111-Leading Hole; 212-Casing; 2121-Opening; 213-End Cap; 22-Electrode Assembly; 221-Main Body; 222-Electrode Tab; 23-First Insulator; 231-Second Connector; 232-Insulating Body; 2321-Second Table surface; 2322-second groove; 233-protrusion; 2331-first surface; 2332-first groove; 234-accommodation space; 24-support frame; 241-first connecting part; 242-main body; 25-electrode terminal; 251-rivet block; 26-current collecting component; 27-second insulating member; 28-sealing member; 29-pressure relief mechanism; 200-controller; 300-motor; X-thickness direction of the first wall; Y-first direction. DETAILED DESCRIPTION

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] The term "plurality" used in this application refers to two or more (including two).

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] The inventors discovered that the current collecting member generally serves to connect the pole post and the tab of the electrode assembly. The current collecting member is disposed between the pole post and the electrode assembly so that the pole post and the tab of the electrode assembly can be connected through the current collecting member. However, during the assembly or use of a battery cell using this structure, the current collecting member will cause a certain degree of compression on the tab, which can easily cause the tab to be squeezed and then inserted into the interior of the electrode assembly. This can easily lead to the risk of short circuit in the battery cell and poor stability in use of the battery cell. To solve the problem of the tab being inserted in reverse, in the prior art, a support frame is generally provided between the electrode assembly and the current collecting member, so that the current collecting member is located on the side of the support frame away from the electrode assembly, so that the tab can be bent around the support frame and then connected to the current collecting member, thereby effectively alleviating the phenomenon of the tab being inserted in reverse into the interior of the electrode assembly. However, in a battery cell of this structure, the support frame may move or shift during the use of the battery cell, which may easily destroy the shape of the tab and even damage the electrode assembly, and then easily cause a short circuit between the electrode assembly and other components or cause the connection between the electrode assembly and the pole to fail, which is not conducive to improving the safety and service life of the battery cell.

[0073] Based on the above considerations, in order to solve the problems of low safety and short service life of battery cells, the inventors, after in-depth research, designed a battery cell, which includes a housing, an electrode assembly, a first insulating member, and a support frame. The housing has a first wall, and the electrode assembly is accommodated in the housing. The electrode assembly includes a main body. Along the thickness direction of the first wall, the first insulating member is arranged on the side of the first wall facing the electrode assembly, and the first insulating member is used to insulate and isolate the electrode assembly from the first wall. Along the thickness direction of the first wall, the support frame is arranged between the main body and the first insulating member, and the support frame and the first insulating member are heat-melted.

[0074] In a battery cell of this structure, a first insulating member for insulating and isolating the electrode assembly and the first wall is provided in the outer shell, and the support frame is connected to the first insulating member by a hot melt connection, so that the support frame can be fixed on the first insulating member to fasten the support frame in the outer shell. A battery cell adopting this structure can reduce the phenomenon of the support frame moving or shifting during use, thereby reducing the risk of the support frame damaging the electrode assembly due to moving or shifting, thereby improving the stability and reliability of the battery cell, and further helping to improve the safety and service life of the battery cell. In addition, the support frame is fixed to the first insulating member by a hot melt connection. On the one hand, it can improve the connection firmness between the support frame and the first insulating member, thereby reducing the risk of the support frame and the first insulating member being separated during use. On the other hand, it is convenient to fix the support frame to the first insulating member, which helps to reduce the difficulty of assembly.

[0075] 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 issue of electrode assemblies being easily damaged during use, thereby improving the safety and service life of the battery cells.

[0076] 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.

[0077] 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.

[0078] Please refer to Figure 1, which is a structural schematic 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. The battery 100 can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source or a 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.

[0079] In some embodiments of the present application, the battery 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0080] 2 and 3 , FIG2 is an exploded view of a battery 100 according to some embodiments of the present invention, and FIG3 is a schematic diagram of a battery cell 20 according to some embodiments of the present invention. The battery 100 includes a housing 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the housing 10 .

[0081] The housing 10 is used to provide assembly space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 overlap each other, and the first housing body 11 and the second housing body 12 together define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open. The first housing body 11 can be a plate-like structure, and the first housing body 11 overlaps the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, with the open side of the first housing body 11 overlapping the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc. For example, in Figure 2, the housing 10 is in the shape of a rectangular parallelepiped.

[0082] In the battery 100, there may be one or more battery cells 20 disposed in the housing 10. When there are multiple battery cells 20 disposed in the housing 10, the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the housing 10. Of course, the battery 100 may also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the housing 10. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for achieving electrical connection between the multiple battery cells 20.

[0083] 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.

[0084] 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 partial 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, comprising a housing 21, an electrode assembly 22, a first insulating member 23, and a support frame 24. The housing 21 has a first wall 211, and the electrode assembly 22 is accommodated within the housing 21. The electrode assembly 22 includes a main body 221. Along the thickness direction X of the first wall, the first insulating member 23 is disposed on the side of the first wall 211 facing the electrode assembly 22. The first insulating member 23 is used to insulate and isolate the electrode assembly 22 from the first wall 211. Along the thickness direction X of the first wall, the support frame 24 is disposed between the main body 221 and the first insulating member 23, and the support frame 24 is thermally fused to the first insulating member 23.

[0085] The housing 21 can also be used to contain an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms, such as a cylinder or a rectangular parallelepiped. Similarly, the housing 21 can be made of various materials, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0086] In some embodiments, the housing 21 may include a shell 212 and an end cover 213, and a accommodating cavity is formed inside the shell 212, which is used to accommodate the electrode assembly 22, and the accommodating cavity has an opening 2121, that is, the shell 212 is a hollow structure with an opening 2121 at one end, and the end cover 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0087] It should be noted that the first wall 211 can be the end cap 213 or a wall of the housing 212. For example, in Figures 3 and 4, the first wall 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the first wall 211 can also be the bottom wall of the housing 212 and the end cap 213, or the side wall of the housing 212 and the end cap 213, which are adjacent to and abut each other.

[0088] When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 212 first, and the housing 212 may be filled with electrolyte. The end cap 213 may then be placed on the opening 2121 of the housing 212 to complete the assembly of the battery cell 20 .

[0089] The housing 212 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, or a prismatic structure. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, a cylindrical housing 212 can be selected; if the electrode assembly 22 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 212 can be selected. Of course, the structure of the end cap 213 can also be various, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 4, the housing 212 has a rectangular parallelepiped structure.

[0090] Of course, it is understandable that the shell 21 is not limited to the above structure. The shell 21 can also be other structures. For example, the shell 21 includes a shell body 212 and two end covers 213. The shell body 212 is a hollow structure with openings 2121 on opposite sides. One end cover 213 corresponds to an opening 2121 of the shell body 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the shell body 212 is formed with openings 2121 on opposite sides, and the two end covers 213 are respectively covered on both sides of the shell body 212 to close the corresponding openings 2121.

[0091] It should be noted that the electrode assembly 22 is the 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 electrode assembly 22 may have various structures. For example, 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. The main body 221 of the electrode assembly 22 may also be a laminated structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet.

[0092] The electrode assembly 22 may further include a tab 222 connected to the main body 221. The tab 222 serves as the positive or negative electrode output of the electrode assembly 22, thereby enabling the input or output of electrical energy from the battery cell 20. The tab 222 of the electrode assembly 22 is formed by stacking and connecting the areas of the positive electrode sheet not coated with the positive electrode active material layer, or by stacking and connecting the areas of the negative electrode sheet not coated with the negative electrode active material layer.

[0093] For example, in FIG4 , the electrode assembly 22 may include two tabs 222 , and both tabs 222 are connected to one end of the main body 221 facing the first wall 211 in the thickness direction X of the first wall. The two tabs 222 are respectively used to output or input the positive and negative electrodes of the electrode assembly 22 , thereby serving as the positive output electrode and negative output electrode of the electrode assembly 22 . If the tabs 222 are used to output the positive electrode of the electrode assembly 22 , then the corresponding tabs 222 of the electrode assembly 22 are components formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the tabs 222 are used to output the negative electrode of the electrode assembly 22 , then the corresponding tabs 222 of the electrode assembly 22 are components formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer.

[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 , with the main bodies 221 of the two electrode assemblies 22 stacked along their thickness, i.e., 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., stacked.

[0095] The first insulating member 23 is arranged on the side of the first wall 211 facing the electrode assembly 22 along the thickness direction X of the first wall. That is, the first insulating member 23 is arranged between the first wall 211 and the electrode assembly 22 in the thickness direction X of the first wall to play the role of insulating and isolating the electrode assembly 22 and the first wall 211, thereby helping to reduce the risk of short circuit between the electrode assembly 22 and the first wall 211.

[0096] Illustratively, the first insulating member 23 serves to insulate and isolate the electrode assembly 22 and the first wall 211 . The first insulating member 23 may be made of various materials, such as polypropylene, polyethylene, or polycarbonate.

[0097] The support frame 24 is arranged between the main body 221 and the first insulating member 23 in the thickness direction X of the first wall, so that the support frame 24 can play a certain supporting role for the main body 221, so as to increase the force-bearing area of ​​the main body 221 of the electrode assembly 22, thereby alleviating the phenomenon of excessive local force on the main body 221 of the electrode assembly 22, which is beneficial to reducing the risk of the main body 221 of the electrode assembly 22 being damaged due to local force.

[0098] Exemplarily, the support frame 24 can be made of various materials, such as polypropylene, polyethylene, or polycarbonate.

[0099] The support frame 24 is connected to the first insulating member 23 by heat-melting, that is, a portion of the support frame 24 and a portion of the first insulating member 23 are melted together and then fixedly connected, so that the portion of the support frame 24 and the portion of the first insulating member 23 are melted into one. Exemplarily, the support frame 24 and the first insulating member 23 can be connected by heat-melting in various ways. For example, the support frame 24 and the first insulating member 23 can be partially melted by laser welding to achieve a heat-melting connection between the support frame 24 and the first insulating member 23, or the support frame 24 and the first insulating member 23 can be partially melted by high-temperature melting to achieve a heat-melting connection between the support frame 24 and the first insulating member 23.

[0100] In some embodiments, referring to Figures 4, 5 and 6, the battery cell 20 may further include an electrode terminal 25, which is mounted on the first wall 211. The electrode terminal 25 is used to be connected to the tab 222 of the electrode assembly 22 to achieve electrical connection between the electrode terminal 25 and the electrode assembly 22, so that electrical energy of the battery cell 20 can be input or output through the electrode terminal 25.

[0101] Exemplarily, the battery cell 20 may include two electrode terminals 25, which serve as the positive output pole and negative output pole of the battery cell 20 respectively. That is, the two electrode terminals 25 are respectively connected to the two pole ears 222 of the electrode assembly 22, so as to be able to output or input the positive pole and negative pole of the battery cell 20.

[0102] Optionally, the battery cell 20 may further include a current collecting member 26, which is provided in a one-to-one correspondence with the electrode terminal 25. The current collecting member 26 is disposed between the support frame 24 and the first insulating member 23 along the thickness direction X of the first wall. The current collecting member 26 is used to connect the electrode terminal 25 and the tab 222 of the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 25. Of course, in other embodiments, the battery cell 20 may not be provided with the current collecting member 26, that is, the tab 222 of the electrode assembly 22 is directly connected to the electrode terminal 25.

[0103] Among them, part of the first insulating member 23 is arranged between the current collecting component 26 and the first wall 211 along the thickness direction X of the first wall, that is, the first insulating member 23 has a part located between the current collecting component 26 and the first wall 211 in the thickness direction X of the first wall, so that the first insulating member 23 can be fixed on the first wall 211, and can effectively insulate and isolate the current collecting component 26 and the first wall 211, which is beneficial to reduce the risk of short circuit between the current collecting component 26 and the first wall 211.

[0104] In Figure 6, the first wall 211 is provided with lead-out holes 2111. These lead-out holes 2111 correspond one-to-one with the electrode terminals 25. The lead-out holes 2111 extend along the thickness direction X of the first wall, with both ends of the lead-out holes 2111 extending through both sides of the first wall 211 along the thickness direction X. Each electrode terminal 25 is positioned within a corresponding lead-out hole 2111, thereby securing the electrode terminal 25 to the first wall 211. In the thickness direction X of the first wall, one end of the electrode terminal 25 is connected to the current collecting member 26, and the other end is connected to the current collecting component within the battery 100, thereby enabling the input and output of electrical energy from the battery cells 20.

[0105] The electrode terminal 25 is insulated and mounted on the first wall 211 , that is, no electrical connection is formed between the electrode terminal 25 and the first wall 211 , that is, no electrical connection is formed between the electrode terminal 25 and the end cover 213 of the housing 21 .

[0106] Optionally, a rivet block 251 may also be connected to the electrode terminal 25. Along the thickness direction X of the first wall, the rivet block 251 is arranged on the side of the first wall 211 away from the first insulating member 23, and the rivet block 251 is connected to the end of the electrode terminal 25 away from the current collecting member 26 to fix the electrode terminal 25 on the first wall 211.

[0107] In some embodiments, as shown in FIG6 , the battery cell 20 may further include a second insulating member 27 and a sealing member 28 , each of which is provided in a one-to-one correspondence with the electrode terminal 25 . Along the thickness direction X of the first wall, at least a portion of the second insulating member 27 is disposed between the rivet block 251 and the first wall 211 to insulate and isolate the rivet block 251 from the first wall 211, thereby advantageously reducing the risk of short circuit between the rivet block 251 and the first wall 211. At least a portion of the sealing member 28 is disposed within the lead-out hole 2111 to seal the gap between the electrode terminal 25 and the wall of the lead-out hole 2111, thereby advantageously reducing the risk of electrolyte leakage within the battery cell 20.

[0108] For example, the second insulating member 27 can be made of various materials, such as plastic, rubber, or silicone, etc. Similarly, the sealing member 28 can also be made of various materials, such as plastic, rubber, or silicone, etc.

[0109] In some embodiments, the battery cell 20 may further include a pressure relief mechanism 29, which is mounted on the housing 21. Alternatively, the pressure relief mechanism 29 may be mounted on the end cap 213 or the housing 212. Similarly, the battery cell 20 may include one or more pressure relief mechanisms 29. The pressure relief mechanism 29 is used to relieve pressure within the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0110] Exemplarily, the battery cell 20 is provided with only one pressure relief mechanism 29 , and the pressure relief mechanism 29 is mounted on the end cover 213 . The pressure relief mechanism 29 may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve.

[0111] A first insulating member 23 for insulating and isolating the electrode assembly 22 and the first wall 211 is provided in the shell 21, and the support frame 24 is connected to the first insulating member 23 by a hot melt connection, so that the support frame 24 can be fixed on the first insulating member 23 to fasten the support frame 24 in the shell 21. The battery cell 20 adopting this structure can reduce the phenomenon of the support frame 24 moving or shifting during use, thereby reducing the risk of the support frame 24 damaging the electrode assembly 22 due to moving or shifting, thereby improving the stability and reliability of the battery cell 20, and further helping to improve the safety and service life of the battery cell 20. In addition, the support frame 24 is fixed to the first insulating member 23 by a hot melt connection. On the one hand, it can improve the connection firmness between the support frame 24 and the first insulating member 23, so as to reduce the risk of the support frame 24 and the first insulating member 23 being detached during use. On the other hand, it is convenient to fix the support frame 24 on the first insulating member 23, which helps to reduce the difficulty of assembly.

[0112] According to some embodiments of the present application, referring to Figures 5 and 6, and further referring to Figures 7 and 8, Figure 7 is a schematic structural diagram of a support frame 24 of a battery cell 20 provided in some embodiments of the present application, and Figure 8 is a schematic structural diagram of a first insulating member 23 of a battery cell 20 provided in some embodiments of the present application. The support frame 24 has a first connecting portion 241, and the first insulating member 23 has a second connecting portion 231. The first connecting portion 241 and the second connecting portion 231 are heat-fused connected. The light transmittance of the support frame 24 is T1, and the light transmittance of the first insulating member 23 is T2, satisfying T1>T2.

[0113] Among them, the first connection part 241 of the support frame 24 and the second connection part 231 of the first insulating member 23 are connected by laser hot melting, that is, part of the first connection part 241 of the support frame 24 and part of the second connection part 231 of the first insulating member 23 are melted by laser welding and connected to each other, and a melting zone is formed between the first connection part 241 of the support frame 24 and the second connection part 231 of the first insulating member 23.

[0114] Light transmittance refers to the ability of light to pass through a medium and is the percentage of the luminous flux transmitted through a transparent or translucent body to the incident luminous flux. In the embodiment of the application, the light transmittance T1 of the first connecting portion 241 is greater than the light transmittance T2 of the second connecting portion 231. That is, the laser's ability to penetrate the first connecting portion 241 is greater than the laser's ability to penetrate the second connecting portion 231. This allows the laser to pass through the first connecting portion 241 of the support frame 24 and irradiate the second connecting portion 231 of the first insulating member 23. This allows the contacting surfaces of the first connecting portion 241 of the support frame 24 and the second connecting portion 231 of the first insulating member 23 to melt and connect.

[0115] The first connecting portion 241 of the support frame 24 and the second connecting portion 231 of the first insulating member 23 are heat-melted to each other to achieve the fixing of the support frame 24 on the first insulating member 23. By setting the transmittance of the first connecting portion 241 of the support frame 24 to be greater than the transmittance of the second connecting portion 231 of the first insulating member 23, on the one hand, the first connecting portion 241 and the second connecting portion 231 with different transmittances can be heat-melted to each other by laser welding, which is conducive to reducing the difficulty of assembling the support frame 24 and the first insulating member 23. On the other hand, during the assembly process of the battery cell 20, the laser can enter from the side of the support frame 24 facing the main body 221 and penetrate the support frame 24 to act on the first connecting portion 241 and the second connecting portion The laser hot-melt connection between the first connecting portion 241 and the second connecting portion 231 is realized on the contact surface of the part 231, which is beneficial to reducing the assembly difficulty of laser welding the support frame 24 and the first insulating member 23 to each other, so as to improve the production efficiency of the battery cell 20, and facilitate the laser to pass through the first connecting portion 241 of the support frame 24 and melt the contact surface of the second connecting portion 231 of the first insulating member 23 and the first connecting portion 241 of the support frame 24, so that the second connecting portion 231 of the first insulating member 23 and the first connecting portion 241 of the support frame 24 are melted and connected to each other, thereby effectively ensuring the connection quality between the first insulating member 23 and the support frame 24, which is beneficial to improving the connection stability and reliability of the first insulating member 23 and the support frame 24.

[0116] In some embodiments, the light transmittance of the first connection portion 241 of the support frame 24 is T1, which satisfies 40%≤T1≤99%.

[0117] 40%≤T1≤99%, that is, the light transmittance of the first connection portion 241 is 40% to 99%. The first connection portion 241 of the support frame 24 can be made of various materials, such as polypropylene, polyethylene, or polycarbonate.

[0118] For example, the light transmittance T1 of the first connection portion 241 may be 40%, 50%, 60%, 70%, 80%, 90% or 99%.

[0119] During the experiment, a single-variable experiment was conducted using a second connecting portion 231 with a light transmittance of 5% and a first connecting portion 241 with a different light transmittance to measure the effect of the different light transmittances of the first connecting portion 241 on the laser heat-melt connection between the first connecting portion 241 and the second connecting portion 231. The experimental results are as follows:

[0120] Table 1

[0121]

[0122] The experimental data above indicates that when the transmittance of the first connecting portion 241 is less than 30%, laser welding between the first connecting portion 241 and the second connecting portion 231 is impossible, thus failing to meet assembly requirements. When the transmittance of the first connecting portion 241 reaches 35%, although the first connecting portion 241 and the second connecting portion 231 can be welded together, the weld strength is insufficient, resulting in desoldering with a force of only 0.5N. However, when the transmittance of the first connecting portion 241 reaches 40%, the first connecting portion 241 and the second connecting portion 231 can be welded together, and the peel strength of the weld strength can reach 2.8N, which meets actual assembly requirements. Therefore, setting the transmittance of the first connecting portion 241 above 40% is preferred to meet both the laser welding requirements and the weld strength requirements between the first connecting portion 241 and the second connecting portion 231.

[0123] Preferably, 60% ≤ T1 ≤ 99%. Continuing with the above experimental results, when the transmittance of the first connecting portion 241 reaches 60%, the first connecting portion 241 and the second connecting portion 231 can be welded to each other, and the peeling force of the weld print strength can reach 3.5N, which helps further ensure the connection strength of the first connecting portion 241 and the second connecting portion 231. By further setting the transmittance of the first connecting portion 241 of the support frame 24 to 60% to 99%, the light transmission effect of the first connecting portion 241 can be further improved, thereby further improving the quality of the laser heat-melting connection between the first connecting portion 241 and the second connecting portion 231, and further helping to further improve the welding strength between the first connecting portion 241 and the second connecting portion 231.

[0124] By setting the transmittance of the first connection part 241 of the support frame 24 to 40% to 99%, the light transmittance effect of the first connection part 241 of the support frame 24 can be effectively guaranteed, so as to alleviate the phenomenon that the laser cannot effectively penetrate the first connection part 241 of the support frame 24 due to the low transmittance of the first connection part 241 of the support frame 24, resulting in the first connection part 241 of the support frame 24 and the second connection part 231 of the first insulating member 23 cannot be welded. This makes it easier for the laser to melt the contact surface between the second connection part 231 of the first insulating member 23 and the first connection part 241 of the support frame 24 after passing through the first connection part 241 of the support frame 24, so that the first insulating member 23 and the support frame 24 are melted and connected to each other, which is beneficial to ensure the connection quality between the first insulating member 23 and the support frame 24.

[0125] In some embodiments, the light transmittance of the second connection portion 231 of the first insulating member 23 is T2, which satisfies 0%≤T2≤10%.

[0126] 0%≤T2≤10%, that is, the light transmittance of the second connecting portion 231 of the first insulating member 23 is 0% to 10%. For example, the second connecting portion 231 of the first insulating member 23 can be made of polypropylene, polyethylene, or polycarbonate.

[0127] For example, the light transmittance T2 of the second connection portion 231 of the first insulating member 23 may be 0%, 1%, 2%, 3%, 5%, 7%, 9% or 10%.

[0128] During the experiment, a single-variable experiment was conducted using a first connecting portion 241 with a light transmittance of 95% and a second connecting portion 231 with a different light transmittance to measure the effect of the second connecting portion 231 with a different light transmittance on the laser heat-melt connection between the first connecting portion 241 and the second connecting portion 231. The experimental results are as follows:

[0129] Table 2

[0130]

[0131] The experimental data above indicates that when the transmittance of the second connecting portion 231 of the first insulating member 23 is greater than 10%, the laser cannot weld the second connecting portion 231 of the first insulating member 23 to the first connecting portion 241 of the support frame 24, thus failing to meet assembly requirements. However, when the transmittance of the second connecting portion 231 of the first insulating member 23 is less than or equal to 10%, the second connecting portion 231 and the first connecting portion 241 can be welded to each other, and the peel strength of the weld print can reach 1.1N, which meets actual assembly requirements. Therefore, setting the transmittance of the second connecting portion 231 to less than 10% can meet both the laser welding requirements and the welding strength requirements between the second connecting portion 231 and the first connecting portion 241.

[0132] By setting the transmittance of the second connection part 231 of the first insulating part 23 to 0% to 10%, the transmittance effect of the second connection part 231 of the first insulating part 23 is reduced, thereby effectively alleviating the phenomenon that the laser cannot melt the contact surface between the second connection part 231 and the first connection part 241 after passing through the second connection part 231 due to the excessive transmittance of the second connection part 231, so that the laser can be concentrated on the contact surface between the second connection part 231 and the first connection part 241, which is beneficial to ensuring the connection quality between the second connection part 231 and the first connection part 241, and is beneficial to reducing the risk of damage to other components of the battery cell 20 after the laser passes through the first insulating part 23, thereby ensuring the production quality of the battery cell 20.

[0133] According to some embodiments of the present application, as shown in FIG. 5 , FIG. 6 and FIG. 7 , along the thickness direction X of the first wall, the first connection portion 241 and the second connection portion 231 are stacked and connected by heat-melting.

[0134] Among them, the first connecting part 241 and the second connecting part 231 are stacked and connected by hot melt, that is, the first connecting part 241 and the second connecting part 231 abut each other in the thickness direction X of the first wall, and are hot melt connected at the position where the first connecting part 241 and the second connecting part 231 abut each other, so that part of the support frame 24 is connected to part of the first insulating part 23.

[0135] The support frame 24 and the first insulating member 23 are respectively provided with a first connecting portion 241 and a second connecting portion 231. By stacking the first connecting portion 241 and the second connecting portion 231 on each other and hot-melting them, a fixed connection between the support frame 24 and the first insulating member 23 can be achieved. On the one hand, the battery cell 20 adopting this structure is easy to assemble, which is beneficial to reducing the difficulty of assembly between the support frame 24 and the first insulating member 23. On the other hand, stacking the first connecting portion 241 and the second connecting portion 231 on each other and then hot-melting them is beneficial to improving the assembly quality between the support frame 24 and the first insulating member 23, thereby improving the connection stability and reliability between the support frame 24 and the first insulating member 23.

[0136] In some embodiments, as shown in FIG. 6 , along the thickness direction X of the first wall, the thickness of the first connection portion 241 is D1 , satisfying 0.5 mm ≤ D1 ≤ 2.5 mm.

[0137] Wherein, 0.5 mm≤D1≤2.5 mm, that is, the dimension of the first connection portion 241 in the thickness direction X of the first wall is 0.5 mm to 2.5 mm.

[0138] Illustratively, the thickness D1 of the first connection portion 241 may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, or 2.5 mm.

[0139] During the experiment, a first connecting portion 241 with a light transmittance of 95% and a second connecting portion 231 with a light transmittance of 5% were selected for the experiment. The thickness of the second connecting portion 231 of the first insulating member 23 was set to 2 mm, and the thickness of the first connecting portion 241 of the support frame 24 in the thickness direction X of the first wall was set to different sizes. The experiment was conducted to measure the effect of different thicknesses of the first connecting portion 241 on the laser hot melt connection between the first connecting portion 241 and the second connecting portion 231. The experimental results are as follows:

[0140] Table 3

[0141]

[0142] It can be seen from the above experimental data that when the thickness of the first connection part 241 is less than 0.5 mm, the first connection part 241 may be welded through during the laser hot melt connection process, which cannot meet the assembly requirements. After the thickness of the first connection part 241 reaches 0.5 mm, the phenomenon of the first connection part 241 being welded through can be alleviated, and the welding strength between the first connection part 241 and the second connection part 231 can be guaranteed. Therefore, the thickness of the first connection part 241 is set to be greater than or equal to 0.5 mm.

[0143] After the thickness of the first connection part 241 reaches 2.5 mm, although the phenomenon of the first connection part 241 being welded through can be alleviated and the welding strength between the first connection part 241 and the second connection part 231 can be guaranteed, after the thickness of the first connection part 241 is greater than 2.5 mm, the increase in the welding strength of the first connection part 241 and the second connection part 231 has not been greatly improved. Therefore, in order to save material of the first connection part 241 and to optimize the occupied space of the first connection part 241, the thickness of the first connection part 241 is preferably less than or equal to 2.5 mm.

[0144] By setting the thickness of the first connection part 241 to 0.5mm to 2.5mm, on the one hand, the phenomenon of insufficient structural strength of the first connection part 241 caused by the thickness of the first connection part 241 being too small can be alleviated, so as to reduce the deformation of the first connection part 241 during the hot-melt connection with the second connection part 231, thereby effectively reducing the risk of gaps or connection failure between the first connection part 241 and the second connection part 231, which is beneficial to improving the connection quality and connection stability between the first connection part 241 and the second connection part 231. On the other hand, it can alleviate the phenomenon of material waste or excessive assembly difficulty caused by the excessive thickness of the first connection part 241, thereby helping to reduce the manufacturing cost of the battery cell 20.

[0145] In some embodiments, please continue to refer to FIG. 6 , along the thickness direction X of the first wall, the thickness of the second connection portion 231 is D2 , satisfying 0.5 mm ≤ D2 ≤ 2.5 mm.

[0146] Wherein, 0.5 mm≤D2≤2.5 mm, that is, the dimension of the second connection portion 231 in the thickness direction X of the first wall is 0.5 mm to 2.5 mm.

[0147] Illustratively, the thickness D2 of the second connection portion 231 may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, or 2.5 mm.

[0148] During the experiment, a first connecting portion 241 with a light transmittance of 95% and a second connecting portion 231 with a light transmittance of 5% were selected for the experiment. The thickness of the first connecting portion 241 of the support frame 24 was set to 2 mm, and the thickness of the second connecting portion 231 of the first insulating member 23 in the thickness direction X of the first wall was set to different sizes. The experiment was conducted to measure the effect of different thicknesses of the second connecting portion 231 on the laser hot melt connection between the first connecting portion 241 and the second connecting portion 231. The experimental results are as follows:

[0149] Table 4

[0150]

[0151] It can be seen from the above experimental data that when the thickness of the second connection part 231 is less than 0.5 mm, the second connection part 231 may be welded through during the laser hot melt connection process, which cannot meet the assembly requirements. After the thickness of the second connection part 231 reaches 0.5 mm, the phenomenon of the second connection part 231 being welded through can be alleviated, and the welding strength between the first connection part 241 and the second connection part 231 can be guaranteed. Therefore, the thickness of the second connection part 231 is set to be greater than or equal to 0.5 mm.

[0152] After the thickness of the second connection part 231 reaches 2.5 mm, although the phenomenon of the second connection part 231 being welded through can be alleviated and the welding strength between the first connection part 241 and the second connection part 231 can be guaranteed, after the thickness of the second connection part 231 is greater than 2.5 mm, the increase in the welding strength of the first connection part 241 and the second connection part 231 has not been greatly improved. Therefore, in order to save material of the second connection part 231 and to optimize the occupied space of the second connection part 231, the thickness of the second connection part 231 is preferably less than or equal to 2.5 mm.

[0153] By setting the thickness of the second connection part 231 to 0.5mm to 2.5mm, on the one hand, the phenomenon of insufficient structural strength of the second connection part 231 caused by the thickness of the second connection part 231 being too small can be alleviated, so as to reduce the deformation of the second connection part 231 during the hot-melt connection with the first connection part 241, thereby effectively reducing the risk of gaps or connection failure between the second connection part 231 and the first connection part 241, which is beneficial to improving the connection quality and connection stability between the second connection part 231 and the first connection part 241. On the other hand, it can alleviate the phenomenon of material waste or excessive assembly difficulty caused by the thickness of the second connection part 231 being too large, thereby helping to reduce the manufacturing cost of the battery cell 20.

[0154] According to some embodiments of the present application, referring to Figures 5, 6 and 7, the support frame 24 further includes a main body portion 242, and the first connecting portion 241 protrudes from one end of the main body portion 242 along a first direction Y, and the first direction Y is perpendicular to the thickness direction X of the first wall.

[0155] Among them, along the first direction Y, the first connecting portion 241 protrudes from one end of the main body portion 242, that is, the first connecting portion 241 is connected to one end of the main body portion 242 in the first direction Y, and the first connecting portion 241 protrudes from the main body portion 242. The first direction Y is the length direction of the support frame 24, and is also the length direction of the end cover 213.

[0156] Exemplarily, the first connecting portion 241 and the main body 242 are integrally formed, that is, the first connecting portion 241 and the main body 242 are manufactured using an integral molding process such as injection molding or extrusion molding to form an integral support frame 24. Of course, the structure of the support frame 24 is not limited to this. In other embodiments, the first connecting portion 241 and the main body 242 may also be separate structures, and the first connecting portion 241 may be connected to one end of the main body 242 in the first direction Y by bonding, clamping, or hot-melt connection.

[0157] The support frame 24 is also provided with a main body portion 242, and the first connecting portion 241 is a portion of the support frame 24 protruding from one end of the main body portion 242 in the first direction Y, that is, the first connecting portion 241 of the support frame 24 used to be connected to the first insulating member 23 is located at one end of the support frame 24 in the first direction Y. The support frame 24 with this structure can effectively avoid other components of the battery cell 20, so as to facilitate the assembly of the support frame 24 and the first insulating member 23, which is conducive to reducing the difficulty of assembly.

[0158] In some embodiments, referring to FIG. 6 and FIG. 7 , along the first direction Y, first connection portions 241 are protruded from both ends of the main body portion 242 , and the first connection portions 241 are disposed in one-to-one correspondence with the second connection portions 231 .

[0159] The first connection parts 241 are protruded from both ends of the main body 242 . That is, the support frame 24 includes two first connection parts 241 , and the two first connection parts 241 are respectively connected to the two ends of the main body 242 in the first direction Y.

[0160] The first connection portion 241 and the second connection portion 231 are arranged in a one-to-one correspondence, that is, the first insulating member 23 is also provided with two second connection portions 231, and each second connection portion 231 and a first connection portion 241 are stacked and connected by heat melting in the thickness direction X of the first wall.

[0161] The main body 242 of the support frame 24 is provided with a first connecting portion 241 at both ends in the first direction Y, and the first insulating member 23 is correspondingly provided with two second connecting portions 231, so that both ends of the support frame 24 in the first direction Y can be fixed on the first insulating member 23, which is beneficial to further improve the stability and reliability of the support frame 24 connected to the first insulating member 23, so as to reduce the risk of the support frame 24 and the first insulating member 23 falling off during use.

[0162] According to some embodiments of the present application, as shown in Figures 6 and 8, the first insulating member 23 includes an insulating body 232 and a protrusion 233. Along the thickness direction X of the first wall, the insulating body 232 is disposed on a side of the first wall 211 facing the electrode assembly 22. The protrusion 233 is protruding from the side of the insulating body 232 facing the electrode assembly 22, and the protrusion 233 has a second connecting portion 231.

[0163] In which, along the thickness direction X of the first wall, the insulating body 232 is arranged on the side of the first wall 211 facing the electrode assembly 22, that is, the insulating body 232 is arranged between the electrode assembly 22 and the first wall 211 in the thickness direction X of the first wall to achieve insulation isolation between the electrode assembly 22 and the first wall 211.

[0164] The protrusion 233 has a second connecting portion 231 . That is, the first connecting portion 241 of the support frame 24 is connected to the protrusion 233 of the first insulating member 23 .

[0165] The first insulating member 23 is provided with an insulating body 232 and a protrusion 233 protruding from the insulating body 232. The protrusion 233 has a second connecting portion 231, so that the first connecting portion 241 of the support frame 24 is connected to the protrusion 233 of the first insulating member 23. The first insulating member 23 with such a structure facilitates the assembly of the first insulating member 23 and the support frame 24, which helps to reduce the difficulty of connecting the first connecting portion 241 and the second connecting portion 231.

[0166] According to some embodiments of the present application, please continue to refer to Figures 6 and 8. Along the thickness direction X of the first wall, the protrusion 233 has a first surface 2331 facing the electrode assembly 22. The first surface 2331 is provided with a first groove 2332. The first connecting portion 241 abuts against the bottom surface of the first groove 2332. The insulating body 232 has a second surface 2321 abutting against the first wall 211. The second surface 2321 is provided with a second groove 2322. The portion of the protrusion 233 located between the bottom surfaces of the first groove 2332 and the bottom surfaces of the second groove 2322 forms the second connecting portion 231.

[0167] Among them, the part of the protrusion 233 located between the bottom surface of the first groove 2332 and the bottom surface of the second groove 2322 forms the second connecting portion 231, that is, the protrusion 233 is respectively provided with the first groove 2332 and the second groove 2322 on both sides of the thickness direction X of the first wall, and the area where the protrusion 233 is located between the bottom surface of the first groove 2332 and the bottom surface of the second groove 2322 is the second connecting portion 231 of the first insulating member 23.

[0168] By providing a first groove 2332 on the first surface 2331 of the protrusion 233 and a second groove 2322 on the second surface 2321 of the insulating body 232, the portion of the protrusion 233 between the bottom surfaces of the first groove 2332 and the second groove 2322 forms the second connecting portion 231 for heat-seal connection with the first connecting portion 241. This structure of the first insulating member 23 ensures the structural strength of the protrusion 233 while also thinning the thickness of the second connecting portion 231, thereby facilitating control of the thickness of the second connecting portion 231 and improving the connection quality between the second connecting portion 231 and the first connecting portion 241. Furthermore, after the first connecting portion 241 abuts against the bottom surface of the first groove 2332 and is heat-seal connected to the second connecting portion 231, the first groove 2332 can accommodate at least a portion of the first connecting portion 241, thereby providing some protection for the first connecting portion 241 and reducing wear of the first connecting portion 241 during assembly or use.

[0169] According to some embodiments of the present application, with reference to Figures 6 and 8, and further with reference to Figure 9, Figure 9 is a schematic diagram of the connection between the support frame 24 and the first insulating member 23 provided in some embodiments of the present application. The first insulating member 23 includes an insulating body 232 and two protrusions 233. Along the thickness direction X of the first wall, the insulating body 232 is arranged on the side of the first wall 211 facing the electrode assembly 22. The two protrusions 233 are protruding from the side of the insulating body 232 facing the electrode assembly 22. Along the first direction Y, the two protrusions 233 are spaced apart, and an accommodating space 234 is formed between the two protrusions 233. The accommodating space 234 is used to accommodate at least a portion of the support frame 24. The first direction Y is perpendicular to the thickness direction X of the first wall.

[0170] An accommodating space 234 is formed between the two protrusions 233 , and the accommodating space 234 is used to accommodate at least a portion of the support frame 24 , that is, the support frame 24 is accommodated between the two protrusions 233 of the first insulating member 23 in the first direction Y.

[0171] By accommodating at least part of the support frame 24 in the accommodating space 234 formed between the two protrusions 233 of the first insulating member 23, the support frame 24 can be limited and positioned to a certain extent. On the one hand, it is convenient for assembling the support frame 24 and can provide a certain protection for the support frame 24. On the other hand, it can further reduce the movement of the support frame 24 during the assembly or use of the battery cell 20, thereby reducing the risk of the support frame 24 damaging the electrode assembly 22 due to movement, which is beneficial to improving the safety and service life of the battery cell 20.

[0172] In some embodiments, as shown in FIG. 6 and FIG. 9 , along the thickness direction X of the first wall, the protrusion 233 has a first surface 2331 facing the main body 221 , and the support frame 24 does not extend beyond the first surface 2331 .

[0173] The support frame 24 does not extend beyond the first surface 2331. That is, the entire support frame 24 is accommodated between the two protrusions 233, so that no portion of the support frame 24 extends beyond the first surface 2331 of the protrusions 233 in the thickness direction X of the first wall. Of course, in other embodiments, the support frame 24 may be partially accommodated between the two protrusions 233, that is, a portion of the support frame 24 extends beyond the first surface 2331 along the thickness direction X of the first wall.

[0174] By setting the support frame 24 in the thickness direction X of the first wall so as not to exceed the first surface 2331 of the protrusion 233, that is, the entire support frame 24 is accommodated in the accommodating space 234, on the one hand, the limiting effect of the first insulating member 23 on the support frame 24 can be improved, and it is beneficial to improve the protection effect of the first insulating member 23 on the support frame 24. On the other hand, it can save the space occupied by the first insulating member 23 and the support frame 24, which is beneficial to optimize the internal space of the battery cell 20 and improve the internal space utilization rate of the battery cell 20.

[0175] According to some embodiments of the present application, as shown in Figures 6, 7, 8, and 9, the support frame 24 includes a main body 242 and a first connecting portion 241. The main body 242 is accommodated in the accommodating space 234. The first connecting portion 241 protrudes from at least one end of the main body 242 along the first direction Y. Along the thickness direction X of the first wall, the protrusion 233 has a first surface 2331 facing the main body 221. The first surface 2331 is provided with a first groove 2332. Along the first direction Y, the first groove 2332 passes through the protrusion 233 and communicates with the accommodating space 234. The first connecting portion 241 extends into the first groove 2332 and is hot-melt-connected to the bottom surface of the first groove 2332.

[0176] The first connection portion 241 protrudes from at least one end of the main body portion 242 along the first direction Y. That is, the main body portion 242 may be provided with the first connection portion 241 at one end in the first direction Y, or may be provided with the first connection portion 241 at both ends in the first direction Y. For example, in FIG7 , the main body portion 242 is provided with the first connection portion 241 at both ends in the first direction Y.

[0177] Along the first direction Y, the first groove 2332 passes through the protrusion 233 and is connected to the accommodating space 234, and the first connecting portion 241 extends into the first groove 2332, that is, the first groove 2332 arranged on the first surface 2331 of the protrusion 233 passes through the side of the protrusion 233 facing the accommodating space 234 along the first direction Y, and enables the first groove 2332 to be connected to the accommodating space 234, so that the first connecting portion 241 of the support frame 24 can extend from the accommodating space 234 to the first groove 2332.

[0178] The first connection portion 241 is connected to the bottom surface of the first groove 2332 by thermal melting. That is, the bottom wall of the first groove 2332 serves as the second connection portion 231 of the first insulating member 23 .

[0179] By setting a first groove 2332 on the first surface 2331 of the protrusion 233 facing the main body 221, and the first groove 2332 passes through the protrusion 233 along the first direction Y and is connected to the accommodating space 234, the protrusion 233 is a stepped structure, so that the main body 242 of the support frame 24 is accommodated in the accommodating space 234, and the first connecting portion 241 of the support frame 24 is set to extend into the first groove 2332, and the first connecting portion 241 is abutted against and hot-melt connected to the bottom surface of the first groove 2332, so that the protrusion 233 can play a certain limiting and positioning role on the support frame 24 in the thickness direction X of the first wall, so as to improve the assembly quality between the support frame 24 and the first insulating member 23, and facilitate the hot-melt connection between the support frame 24 and the first insulating member 23, which is beneficial to reduce the difficulty of assembly.

[0180] According to some embodiments of the present application, referring to Figures 6, 8, and 9, and further referring to Figure 10, Figure 10 is a bottom view of the support frame 24 connected to the first insulating member 23 provided in some embodiments of the present application. The first connecting portion 241 is spaced apart from the side surface of the first groove 2332, and the distance between the first connecting portion 241 and the side surface of the first groove 2332 is L, which satisfies the condition of 0.8 mm ≤ L ≤ 2 mm.

[0181] The first connection portion 241 is spaced apart from the side surface of the first groove 2332 , that is, in a direction perpendicular to the thickness direction X of the first wall, there is a gap between the first connection portion 241 of the support frame 24 and the side surface of the first groove 2332 .

[0182] The distance L between the first connection portion 241 and the side surface of the first groove 2332 satisfies 0.8 mm ≤ L ≤ 2 mm. That is, the gap between the first connection portion 241 and the side surface of the first groove 2332 is 0.8 mm to 2 mm.

[0183] For example, the distance L between the first connection portion 241 and the groove side of the first groove 2332 may be 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm.

[0184] By setting the distance between the first connection part 241 of the support frame 24 and the groove side of the first groove 2332 to 0.8mm to 2mm, on the one hand, it can alleviate the phenomenon that the distance between the first connection part 241 accommodated in the first groove 2332 and the groove side of the first groove 2332 is too small, resulting in the support frame 24 being assembled into the first groove 2332 in the accommodating space 234. It is too difficult and the assembly accuracy requirement is too high, which is beneficial to reduce the assembly difficulty between the support frame 24 and the first insulating part 23 to improve the assembly efficiency. On the other hand, it can alleviate the phenomenon that the distance between the first connection part 241 of the support frame 24 and the groove side of the first groove 2332 is too large, resulting in the first groove 2332 having poor limiting and positioning effects on the support frame 24.

[0185] According to some embodiments of the present application, as shown in Figures 4, 5, and 6, the battery cell 20 further includes an electrode terminal 25, which is disposed on the first wall 211. The electrode assembly 22 further includes a tab 222, which is protruding from one end of the main body 221 facing the first wall 211 along the thickness direction X of the first wall. The tab 222 is bent around the support frame 24 and is connected to the electrode terminal 25.

[0186] The electrode terminals 25 serve to output or input electrical energy from the battery cell 20 . The electrode terminals 25 may be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloy.

[0187] Along the thickness direction X of the first wall, the tab 222 is protruding from one end of the main body 221 facing the first wall 211 , that is, the tab 222 is formed on one end of the electrode assembly 22 close to the first wall 211 in the thickness direction X of the first wall.

[0188] If the tab 222 is used to output the positive electrode of the electrode assembly 22, the tab 222 is formed by stacking and connecting the areas of the positive electrode sheet that are not coated with the positive electrode active material layer. If the tab 222 is used to output the negative electrode of the electrode assembly 22, the tab 222 is formed by stacking and connecting the areas of the negative electrode sheet that are not coated with the negative electrode active material layer. Exemplarily, the electrode assembly 22 has two tabs 222, both of which are protruding from one end of the main body 221 facing the first wall 211, and the two tabs 222 respectively output or input the positive and negative electrodes of the electrode assembly 22.

[0189] Exemplarily, there are two electrode terminals 25 , both of which are mounted on the first wall 211 , and each electrode terminal 25 is connected to a tab 222 , so that the positive and negative electrodes of the battery cell 20 can be input or output through the two electrode terminals 25 .

[0190] The tab 222 is bent around the support frame 24, that is, the tab 222 is bent from one end of the main body 221 around the support frame 24 and connected to the electrode terminal 25 located on the side of the support frame 24 away from the main body 221, so as to reduce the phenomenon of the tab 222 being inserted upside down into the main body 221, which is beneficial to reducing the short circuit risk of the battery cell 20.

[0191] Illustratively, the tab 222 is bent around the main body 242 of the support frame 24 and then connected to the electrode terminal 25 .

[0192] It should be noted that, in other embodiments, the tab 222 can also be set to a structure that is not bent around the support frame 24, that is, the tab 222 is located on the side of the support frame 24 facing the main body 221 in the thickness direction X of the first wall. In this embodiment, it is only necessary to connect a connector between the current collecting component 26 and the tab 222 to achieve electrical connection between the current collecting component 26 and the tab 222. The connector can be a wire, a U-shaped connecting piece or an L-shaped connecting piece, etc.

[0193] An electrode terminal 25 is provided on the first wall 211 of the shell 21, and the pole ear 222 is provided on the end of the main body 221 facing the first wall 211. The pole ear 222 is set to be bent around the support frame 24 and then connected to the electrode terminal 25 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 25, thereby enabling the input or output of electrical energy of the battery cell 20 to be achieved. The battery cell 20 with this structure makes the part where the pole ear 222 is connected to the electrode terminal 25 be located on the side of the support frame 24 away from the main body 221, thereby effectively alleviating the phenomenon of the pole ear 222 being upside down inserted into the main body 221 of the electrode assembly 22 during assembly or use, which is beneficial to reduce the short circuit risk of the battery cell 20 and improve the safety of the battery cell 20. In addition, since the support frame 24 is hot-melt connected to the first insulating member 23, the phenomenon of movement or displacement of the support frame 24 during the use of the battery cell 20 can be effectively reduced, thereby effectively reducing the risk of the support frame 24 destroying the shape of the pole ear 222 or damaging the pole ear 222 due to movement, thereby alleviating the short circuit between the pole ear 222 and other components or the connection failure between the electrode assembly 22 and the electrode terminal 25, which is beneficial to improving the safety of use and service life of the battery cell 20.

[0194] According to some embodiments of the present application, please continue to refer to Figures 4, 5 and 6. The battery cell 20 also includes a current collecting component 26. Along the thickness direction X of the first wall, the current collecting component 26 is arranged between the first insulating member 23 and the support frame 24. The current collecting component 26 connects the electrode terminal 25 and the tab 222.

[0195] The current collecting member 26 connects the electrode terminal 25 and the tab 222 of the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 25. The current collecting member 26 can be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloy.

[0196] Illustratively, the current collecting member 26 is connected to the electrode terminal 25 and the tab 222 by welding.

[0197] The current collecting component 26 is arranged between the first insulating component 23 and the support frame 24, that is, in the thickness direction X of the first wall, the first insulating component 23 and the support frame 24 are respectively located on both sides of the current collecting component 26, so that the first insulating component 23 is located between the current collecting component 26 and the first wall 211 to insulate and isolate the current collecting component 26 and the first wall 211.

[0198] Illustratively, there are two current collecting members 26 , and each current collecting member 26 is connected to one electrode terminal 25 and one electrode tab 222 , so as to achieve electrical connection between the electrode assembly 22 and the two electrode terminals 25 .

[0199] It should be noted that, in an embodiment in which the first insulating member 23 includes an insulating body 232 and a protrusion 233 protruding from the side of the insulating body 232 facing the electrode assembly 22 along the thickness direction X of the first wall, the current collecting component 26 is located between the main body 242 of the support frame 24 and the insulating body 232 of the first insulating member 23 along the thickness direction X of the first wall, so as to realize the connection between the current collecting component 26 and the electrode terminal 25 and the tab 222, and the first wall 211 and the current collecting component 26 can be insulated and isolated by the insulating body 232 of the first insulating member 23.

[0200] A current collecting component 26 is also provided in the battery cell 20. By connecting the current collecting component 26 to the electrode terminal 25 and arranging the current collecting component 26 between the first insulating member 23 and the support frame 24, the current collecting component 26 is connected to the electrode terminal 25 and the electrode tab 222 of the electrode assembly 22, thereby realizing electrical connection between the electrode assembly 22 and the electrode terminal 25 to output or input electrical energy of the battery cell 20. This structure facilitates connecting the tab 222 to the current collecting component 26, which helps to reduce the difficulty of assembly between the tab 222 and the electrode terminal 25.

[0201] According to some embodiments of the present application, as shown in Figures 3 and 4 , the housing 21 includes a shell 212 and an end cap 213. The interior of the shell 212 forms a receiving cavity with an opening 2121, and the electrode assembly 22 is received within the receiving cavity. The end cap 213 closes the opening 2121 and serves as the first wall 211.

[0202] The end cap 213 is the first wall 211 , that is, the first insulating member 23 and the support frame 24 are disposed between the end cap 213 and the main body 221 of the electrode assembly 22 in the thickness direction X of the first wall.

[0203] The first wall 211 of the outer shell 21 is the end cover 213 of the outer shell 21 for closing the opening 2121 of the shell body 212. The battery cell 20 adopting this structure is convenient for assembling the support frame 24 and the first insulating member 23, and is conducive to reducing the difficulty of assembling the first insulating member 23 into the outer shell 21 and between the support frame 24 and the first insulating member 23, thereby helping to improve the production efficiency of the battery cell 20.

[0204] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 may also have other structures. For example, the outer shell 21 includes a shell 212 and an end cap 213. The shell 212 includes an integrally formed side wall and a first wall 211. The side wall is arranged around the first wall 211. Along the thickness direction X of the first wall, one end of the side wall is connected to the first wall 211, and the other end is enclosed to form an opening 2121. The side wall and the first wall 211 jointly define a receiving cavity for accommodating the electrode assembly 22, and the end cap 213 closes the opening 2121. In other words, the first wall 211 is the bottom wall of the shell 212, which is arranged opposite to the end cap 213 in the thickness direction X of the first wall. That is, the first insulating member 23 and the support frame 24 are arranged between the bottom wall of the shell 212, which is arranged opposite to the end cap 213, and the main body 221 of the electrode assembly 22 in the thickness direction X of the first wall.

[0205] The shell 212 includes an integrally formed side wall and a first wall 211 , that is, the shell 212 is made using an integral molding process, such as stamping, casting or extrusion molding, that is, the side wall and the first wall 211 of the shell 212 are an integral structure.

[0206] The first wall 211 is a wall of the shell 212 that is arranged opposite to the end cover 213 in the thickness direction X of the first wall. The battery cell 20 adopting this structure can keep the first insulating member 23, the support frame 24 and other components away from the end cover 213, and there is no direct connection between the first wall 211 and the end cover 213, so that the force generated by the pulling or twisting of the first wall 211 by the first insulating member 23, the support frame 24 and other components can act on the end cover 213, thereby reducing the risk of connection failure between the end cover 213 and the shell 212, which is conducive to further reducing the risk of leakage of the battery cell 20 during use.

[0207] 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.

[0208] The battery 100 may further include a box body 10 , in which the battery cells 20 are accommodated.

[0209] Optionally, the battery cell 20 housed in the housing 10 may be one or more. For example, in FIG2 , the battery 100 includes multiple battery cells 20, and the multiple battery cells 20 are housed in the housing 10. The multiple battery cells 20 may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a configuration in which the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed in the housing 10.

[0210] 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.

[0211] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0212] According to some embodiments of the present application, as shown in Figures 3 to 10 , a battery cell 20 is provided. The battery cell 20 includes a housing 21, an electrode terminal 25, a current collecting member 26, an electrode assembly 22, a first insulating member 23, and a support frame 24. The housing 21 includes a shell 212 and an end cap 213. The interior of the shell 212 forms a receiving cavity with an opening 2121, and the electrode assembly 22 is received within the receiving cavity. The end cap 213 closes the opening 2121 and serves as a first wall 211. The electrode terminal is connected to the first wall 211, and the current collecting member 26 is connected to the electrode terminal 25. The electrode assembly 22 is received within the housing 21 and includes a main body 221 and a tab 222. The tab 222 is protruding from the end of the main body 221 facing the first wall 211 along the thickness direction X of the first wall. The tab 222 is connected to the current collecting member 26. Along the thickness direction X of the first wall, a first insulating member 23 is disposed between the first wall 211 and the current collecting member 26. The first insulating member 23 is used to insulate and isolate the current collecting member 26 from the first wall 211. The first insulating member 23 includes an insulating body 232 and two protrusions 233. Along the thickness direction X of the first wall, the insulating body 232 is disposed on the side of the first wall 211 facing the electrode assembly 22. The protrusions 233 are disposed on the side of the insulating body 232 facing the electrode assembly 22. The two protrusions 233 are spaced apart along the first direction Y and jointly define a receiving space 234. The protrusions 233 have a first surface 2331 facing the electrode assembly 22, and are provided with a first groove 2332 on the first surface 2331. The insulating body 232 has a second surface 2321 that abuts the first wall 211, and is provided with a second groove 2322 on the second surface 2321. The portion of the protrusion 233 located between the bottom surfaces of the first groove 2332 and the bottom surfaces of the second groove 2322 forms a second connecting portion 231. The support frame 24 includes a main body 242 and a first connecting portion 241 protruding from both ends of the main body 242 along the first direction Y. The main body 242 is accommodated in the accommodating space 234. The current collecting component 26 is located between the main body 242 and the insulating body 232 of the first insulating member 23. The pole ear 222 is bent around the main body 242, and the pole ear 222 is connected to the current collecting component 26. The first connecting portion 241 extends into the first groove 2332 along the first direction Y, and the first connecting portion 241 and the second connecting portion 231 are stacked along the thickness direction X of the first wall and connected by laser hot melt. The first direction Y is perpendicular to the thickness direction X of the first wall. Among them, the transmittance of the first connecting part 241 is T1, the transmittance of the second connecting part 231 is T2, satisfying 40%≤T1≤99%, 0%≤T2≤10%, and along the thickness direction X of the first wall, the thickness of the first connecting part 241 is D1, the thickness of the first connecting part 241 is D2, satisfying 0.5mm≤D1≤2.5mm, 0.5mm≤D2≤2.5mm.

[0213] 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.

[0214] 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 is contained in the housing, and the electrode assembly includes a main body; A first insulating member, along the thickness direction of the first wall, the first insulating member is arranged on a side of the first wall facing the electrode assembly; as well as A support frame is disposed between the main body and the first insulating member along the thickness direction of the first wall, and the support frame is connected to the first insulating member by thermal melting.

2. The battery cell according to claim 1, wherein: The support frame has a first connection part, the first insulating member has a second connection part, the first connection part and the second connection part are hot-melt connected, the light transmittance of the first connection part is T1, the light transmittance of the second connection part is T2, and T1>T2 is satisfied.

3. The battery cell according to claim 2, wherein: 40％≤T1≤99％。 4. The battery cell according to claim 3, wherein: 60％≤T1≤99％。 5. The battery cell according to any one of claims 2 to 4, wherein: 0％≤T2≤10％。 6. The battery cell according to any one of claims 2 to 5, wherein: The first connection portion and the second connection portion are stacked and connected by thermal fusion along the thickness direction of the first wall.

7. The battery cell according to claim 6, wherein: Along the thickness direction of the first wall, the thickness of the first connecting portion is D1, satisfying 0.5 mm≤D1≤2.5 mm.

8. The battery cell according to claim 6 or 7, wherein: Along the thickness direction of the first wall, the thickness of the second connecting portion is D2, satisfying 0.5 mm≤D2≤2.5 mm.

9. The battery cell according to any one of claims 6 to 8, wherein: The support frame also includes a main body portion. The first connecting portion protrudes from one end of the main body portion along a first direction. The first direction is perpendicular to the thickness direction of the first wall.

10. The battery cell according to claim 9, wherein: Along the first direction, both ends of the main body are protrudingly provided with the first connecting parts, and the first connecting parts are arranged in a one-to-one correspondence with the second connecting parts.

11. The battery cell according to any one of claims 6 to 10, wherein: The first insulating member comprises: an insulating body, arranged on a side of the first wall facing the electrode assembly along a thickness direction of the first wall; A protrusion is protruded on a side of the insulating body facing the electrode assembly, and the protrusion has the second connecting portion.

12. The battery cell according to claim 11, wherein: Along the thickness direction of the first wall, the protrusion has a first surface facing the electrode assembly, the first surface is provided with a first groove, and the first connecting portion abuts against the bottom surface of the first groove; The insulating body has a second surface abutting against the first wall, the second surface is provided with a second groove, and the portion of the protrusion located between the groove bottom surface of the first groove and the groove bottom surface of the second groove forms the second connecting portion.

13. The battery cell according to any one of claims 1 to 12, wherein: The first insulating member comprises: an insulating body, arranged on a side of the first wall facing the electrode assembly along a thickness direction of the first wall; Two protrusions are protruded on the side of the insulating body facing the electrode assembly. Along the first direction, the two protrusions are spaced apart to form a receiving space between the two protrusions. The receiving space is used to receive at least part of the support frame. The first direction is perpendicular to the thickness direction of the first wall.

14. The battery cell according to claim 13, wherein: Along the thickness direction of the first wall, the protrusion has a first surface facing the main body, and the support frame does not extend beyond the first surface.

15. The battery cell according to claim 13 or 14, wherein: The support frame comprises a main body and a first connecting portion, the main body is accommodated in the accommodation space, and along the first direction, the first connecting portion protrudes from at least one end of the main body; Along the thickness direction of the first wall, the protrusion has a first surface facing the main body, and the first surface is provided with a first groove. Along the first direction, the first groove penetrates the protrusion and is connected with the accommodating space. The first connecting part extends into the first groove, and the first connecting part is hot-melt connected to the bottom surface of the first groove.

16. The battery cell according to claim 15, wherein: The first connection portion is spaced apart from the groove side surface of the first groove, and the distance between the first connection portion and the groove side surface of the first groove is L, which satisfies 0.8 mm≤L≤2 mm.

17. The battery cell according to any one of claims 1 to 16, wherein: The battery cell further comprises: an electrode terminal, disposed on the first wall; The electrode assembly further includes a pole ear, which is protruding from one end of the main body facing the first wall along the thickness direction of the first wall, the pole ear is bent around the support frame, and the pole ear is connected to the electrode terminal.

18. The battery cell according to claim 17, wherein: The battery cell further comprises: A current collecting component is disposed between the first insulating member and the support frame along the thickness direction of the first wall, and the current collecting component connects the electrode terminal and the electrode tab.

19. The battery cell according to any one of claims 1 to 18, wherein: The housing comprises: A housing having an opening formed therein, wherein the electrode assembly is accommodated in the housing; an end cap for closing the opening; Wherein, the end cover is the first wall.

20. The battery cell according to any one of claims 1 to 18, wherein: The housing comprises: A shell, comprising an integrally formed side wall and the first wall, wherein the side wall is disposed around the first wall, and along the thickness direction of the first wall, one end of the side wall is connected to the first wall, and the other end is enclosed to form an opening, and the side wall and the first wall jointly define a housing cavity for housing the electrode assembly; An end cap closes the opening.

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

22. An electrical device comprising the battery as claimed in claim 21.

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