Battery monomer, battery and electric device

Abstract

The utility model relates to the field of batteries, and provides a battery monomer, a battery and a power utilization device. The battery cell includes a housing, an electrode assembly, and an insulating case. The insulating shell is accommodated in the shell. The electrode assembly is accommodated in the insulating shell. The bottom of the insulating shell is provided with a first through hole which is communicated with the inside and the outside of the insulating shell. The battery monomers can be relatively comprehensively and reliably coated outside the electrode assembly through the insulating shell to reliably insulate and isolate the electrode assembly and the shell, and on the basis, a first through hole can be formed in the bottom of the insulating shell, so that an electrolyte infiltration channel is formed through the first through hole, and the electrolyte infiltration channel is formed through the second through hole. Therefore, the electrolyte sinking to the bottom of the insulating shell due to gravity can enter the inner side of the insulating shell from the outer side of the insulating shell through the first through hole, and the electrode assembly in the insulating shell can be fully infiltrated, so that the infiltrating effect of the electrolyte on the electrode assembly can be improved, and the use reliability of the battery monomer can be improved.

Description

Technical Field

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

[0002] The battery cell includes a shell, and an electrode assembly, an electrolyte and an insulating shell arranged in the shell. The electrode assembly is contained in the insulating shell, and the insulating shell is used to insulate and isolate the electrode assembly and the shell. In some cases, the insulating shell covers the electrode assembly relatively comprehensively and reliably, making it difficult for the electrolyte on the outside of the insulating shell to enter the inside of the insulating shell, resulting in the risk that a part of the electrode assembly may not be infiltrated by the electrolyte. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery and an electrical device, aiming to solve the problem that the insulating shell covers the electrode assembly relatively comprehensively and reliably, resulting in the electrolyte on the outside of the insulating shell being difficult to enter the inside of the insulating shell, resulting in the risk that part of the electrode assembly may not be infiltrated by the electrolyte.

[0004] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is:

[0005] In a first aspect, a battery cell is provided, the battery cell comprising:

[0006] shell;

[0007] Electrode assembly;

[0008] The insulating shell is accommodated in the outer shell; the electrode assembly is accommodated in the insulating shell; a first through hole is provided at the bottom of the insulating shell, and the first through hole communicates the inside and the outside of the insulating shell.

[0009] The battery cell provided in the embodiment of the present application can be relatively fully and reliably covered on the outside of the electrode assembly by the insulating shell, and the electrode assembly and the shell can be reliably insulated and isolated, so as to improve the insulation effect of the insulating shell between the electrode assembly and the shell, and reduce the risk of shell corrosion caused by direct contact between the electrode assembly and the shell. On this basis, a first through hole can be opened at the bottom of the insulating shell to form an electrolyte infiltration channel through the first through hole, so that the electrolyte that sinks to the bottom of the insulating shell due to gravity can enter from the outside of the insulating shell to the inside of the insulating shell through the first through hole, and can fully infiltrate the electrode assembly in the insulating shell, thereby improving the electrolyte infiltration effect on the electrode assembly and improving the reliability of the battery cell.

[0010] In some embodiments, the insulating shell includes a shell body and an extended folding piece, the electrode assembly is accommodated in the shell body, the shell body has a substrate supporting the electrode assembly, the extended folding piece is connected to one side of the substrate along a first direction, the extended folding piece is folded to the corresponding side of the shell body along the first direction, and covers the gap between the corresponding side of the shell body along the first direction and the substrate, and a first through hole is provided at the bottom of the shell body.

[0011] By adopting the above scheme, the insulating shell can accommodate the electrode assembly through the shell body, and form a relatively comprehensive and reliable coating on the bottom and the surrounding side of the electrode assembly. On this basis, the insulating shell can also be bent relative to the substrate to the corresponding side of the shell body along the first direction, so as to cover the corner area between the corresponding side of the shell body along the first direction and the substrate through the extended folding sheet, and cover the gap between the corresponding side of the shell body along the first direction and the substrate. Based on this, the electrode assembly and the shell can be reliably insulated and isolated through the extended folding sheet at the gap between the corresponding side of the shell body along the first direction and the substrate. In this way, the comprehensiveness and reliability of the coating of the electrode assembly by the insulating shell can be improved, the insulation effect of the insulating shell between the electrode assembly and the shell can be improved, the risk of the electrode assembly contacting the shell through the gap between the corresponding side of the shell body along the first direction and the substrate can be reduced, and the risk of the shell being corroded due to direct contact between the electrode assembly and the shell can be reduced.

[0012] The insulating shell adopts a structural design of a shell body and an extended folded piece to improve the insulating effect of the insulating shell between the electrode assembly and the outer shell. The insulating shell also sets a first through hole at the bottom of the shell body to form an electrolyte infiltration channel through the first through hole, which facilitates the electrolyte to enter the inside of the shell body from the outside of the shell body through the first through hole, thereby taking into account and balancing and optimizing the insulating effect of the insulating shell and the wetting effect of the electrolyte on the electrode assembly.

[0013] In some embodiments, the substrate is provided with a first through hole.

[0014] By adopting the above scheme, on the basis of the insulating shell adopting the structural design of the shell body and the extended folded piece to improve the insulating effect between the insulating shell and the electrode assembly and the outer shell, the shell body can form an electrolyte infiltration channel on the bottom surface of the shell body by penetrating the first through hole in the substrate. Based on this, the electrolyte that sinks to the bottom of the insulating shell due to gravity can smoothly and reliably enter the shell body from the outside of the shell body to the inside of the shell body along the first through hole of the substrate, thereby improving the electrolyte infiltration effect on the electrode assembly.

[0015] Furthermore, the first through hole provided on the substrate will avoid the seam of the insulating shell. Based on this, when the insulating shell is in the unfolded state, during the layout design and processing of the first through hole, it is unnecessary to consider the influence of the bonding structure (such as tape) and the extended folding piece at the seam of the insulating shell on the layout of the first through hole, thereby facilitating the processing and layout of the first through hole.

[0016] In some embodiments, the battery cell further includes a bottom support plate supported on a bottom side of the substrate.

[0017] By adopting the above scheme, based on the structural design of the insulating shell adopting the shell main body and the extended folding piece, a bottom support plate can be set on the bottom side of the substrate to support and strengthen the substrate via the bottom support plate, thereby enhancing the comprehensive strength of the substrate and the bottom support plate, thereby enabling the bottom support plate to cooperate with the substrate to provide reliable support for the electrode assembly.

[0018] By adopting the above scheme, when the substrate is provided with the first through hole and the bottom support plate is not provided with the electrolyte infiltration channel, the electrolyte that sinks to the bottom of the insulating shell due to gravity can smoothly and reliably enter the shell body from the outside of the shell body through the gap between the bottom support plate and the substrate and the first through hole of the substrate. Based on this, the electrolyte infiltration effect on the electrode assembly can be improved, and the bottom support plate can be blocked between the first through hole and the shell, thereby reducing the risk of the electrode assembly contacting the shell through the first through hole, and reducing the risk of shell corrosion caused by direct contact between the electrode assembly and the shell.

[0019] In some embodiments, a second through hole passes through the bottom supporting plate.

[0020] By adopting the above scheme, when the substrate is provided with a first through hole and the bottom support plate is supported on the bottom side of the substrate, the bottom support plate can be provided with an electrolyte infiltration channel by penetrating a second through hole in the bottom support plate. Based on this, the electrolyte that sinks to the bottom of the insulating shell due to gravity can smoothly and reliably enter the shell body from the outside through the second through hole of the bottom support plate and the first through hole of the substrate, thereby improving the electrolyte infiltration effect on the electrode assembly.

[0021] In some embodiments, along the thickness direction of the substrate, the second through hole is staggered with the first through hole.

[0022] By adopting the above scheme, by displacing the second through hole with the first through hole along the thickness direction of the substrate, on the one hand, it is convenient for the electrolyte that sinks to the bottom of the insulating shell due to gravity to enter the inside of the shell body smoothly and reliably from the outside of the shell body through the second through hole of the bottom support plate, the gap between the bottom support plate and the substrate, and the first through hole of the substrate, thereby improving the infiltration effect of the electrolyte on the electrode assembly. On the other hand, it can reduce the risk of the second through hole and the first through hole being aligned and forming a straight-through channel, reduce the risk of the electrode assembly contacting the shell through the straight-through channel formed by the alignment of the second through hole and the first through hole, and reduce the risk of the shell corroding due to direct contact between the electrode assembly and the shell.

[0023] In some embodiments, the substrate is provided with a plurality of first through holes arranged in a matrix, wherein the plurality of first through holes arranged at intervals along a second direction together form a first hole group, and the second direction is perpendicular to the first direction;

[0024] The bottom support plate is provided with a plurality of second through holes arranged in a matrix, wherein the plurality of second through holes arranged at intervals along the second direction together form a second hole group; the second hole group and the first hole group are arranged alternately along the first direction.

[0025] By adopting the above scheme, the layout of each first through hole of the substrate and the layout of each second through hole of the bottom support plate can be regularized and comprehensively optimized. Based on this, on the one hand, it is convenient for the electrolyte that sinks to the bottom of the insulating shell due to gravity to enter the inside of the shell body smoothly and quickly from the outside of the shell body through the second through holes arranged in a matrix on the bottom support plate, the gap between the bottom support plate and the substrate, and the first through holes arranged in a matrix on the substrate, and evenly and widely distributed in various areas within the shell body, and comprehensively and reliably infiltrates various areas of the electrode assembly, thereby improving the infiltration effect of the electrolyte on the electrode assembly. On the other hand, the second hole group and the first hole group can be staggered regularly, and the electrode assembly can be reliably prevented from directly contacting the shell through the staggered second hole group and the first hole group, so that the risk of shell corrosion caused by direct contact between the electrode assembly and the shell can be greatly reduced on the basis of improving the infiltration effect of the electrolyte on the electrode assembly.

[0026] In some embodiments, a minimum distance between the second through hole and a first through hole adjacent to the second through hole along the first direction is greater than or equal to 1 mm.

[0027] By adopting the above scheme, in the case where the substrate is provided with a first through hole, the bottom support plate is provided with a second through hole, and the second through hole and the first through hole are staggered along the thickness direction of the substrate, by making the minimum spacing d1 between the second through hole and the first through hole adjacent to each other along the first direction greater than or equal to 1 mm, the second through holes adjacent to each other along the first direction can be staggered by a sufficient distance. Based on this, the electrolyte can be prompted to flow a certain distance along the gap between the bottom support plate and the substrate after entering the second through hole of the bottom support plate, and then enter the inner side of the shell body along the first through hole of the substrate; conversely, it can also be prompted that the active material (such as carbon powder) of the electrode assembly is difficult to directly overlap the shell through the staggered first through hole and the second through hole, thereby greatly reducing the risk of direct contact between the electrode assembly and the shell, and reducing the risk of shell corrosion caused by direct contact between the electrode assembly and the shell.

[0028] In some embodiments, the shape of the second through hole is different from the shape of the first through hole.

[0029] By adopting the above scheme, when the substrate is provided with a first through hole and the bottom support plate is provided with a second through hole, by making the shape of the second through hole different from the shape of the first through hole, it is convenient to form a differentiated mark or logo through the second through hole and the first through hole, so that the bottom support plate and the substrate are clearly distinguished. Based on this, it is convenient to distinguish and identify the bottom support plate quickly, accurately and reliably during the assembly process of the bottom support plate and the insulating shell, so as to reduce the risk of missing the bottom support plate on the bottom side of the insulating shell, thereby facilitating the improvement of the assembly yield and assembly efficiency between the bottom support plate and the insulating shell.

[0030] In some embodiments, the shell body includes two main folds, which are disposed on opposite sides of the base sheet along a second direction, and the second direction is perpendicular to the first direction;

[0031] A first through hole is provided on a side of at least one main folding sheet close to the base sheet.

[0032] By adopting the above scheme, on the basis of the insulating shell adopting the structural design of the shell body and the extended folding piece to improve the insulating effect of the insulating shell between the electrode assembly and the shell, the shell body can form an electrolyte infiltration channel on the large surface of the shell body with a larger area by penetrating the first through hole at the bottom of at least one main folding piece. Based on this, on the one hand, since the main folding piece is the large surface of the shell body with a larger area, the influence of the setting of the first through hole on the strength of the main folding piece can be reduced, thereby facilitating the processing of the first through hole and improving the reliability of the use of the insulating shell. On the other hand, it can facilitate the electrolyte that sinks to the bottom of the insulating shell due to gravity to smoothly and reliably enter the shell body from the outside of the shell body to the inside of the shell body along the first through hole at the bottom of the main folding piece, thereby improving the infiltration effect of the electrolyte on the electrode assembly.

[0033] Furthermore, the first through hole provided on the main folding piece will be arranged away from the seam of the insulating shell. Based on this, when the insulating shell is in the unfolded state, during the layout design and processing of the first through hole, it is unnecessary to consider the influence of the bonding structure (such as tape) at the seam of the insulating shell and the extended folding piece on the layout of the first through hole, thereby facilitating the processing and layout of the first through hole.

[0034] In some embodiments, the minimum distance from the first through hole of the main flap to the base sheet is 1 mm to 10 mm.

[0035] By adopting the above scheme, by making the minimum distance d2 from the first through hole provided in the main folding sheet to the substrate in the range of 1mm to 10mm, the first through hole provided in the main folding sheet can be close to the first folding line between the main folding sheet and the substrate, and the first through hole can be provided at the bottom of the main folding sheet. Based on this, the electrolyte that sinks to the bottom of the insulating shell due to gravity can smoothly and quickly enter from the outside of the shell body to the inside of the shell body along the first through hole at the bottom of the main folding sheet, and fully and reliably infiltrate various areas of the electrode assembly, thereby improving the infiltration effect of the electrolyte on the electrode assembly.

[0036] In some embodiments, the battery cell further includes a bottom support plate, the bottom support plate is supported on the bottom side of the substrate, and the bottom support plate is provided with a distinguishing hole, and the distinguishing hole is used to distinguish the bottom support plate from the substrate.

[0037] By adopting the above scheme, based on the structural design of the insulating shell adopting the shell main body and the extended folding piece, a bottom support plate can be set on the bottom side of the substrate to support and strengthen the substrate via the bottom support plate, thereby enhancing the comprehensive strength of the substrate and the bottom support plate, thereby enabling the bottom support plate to cooperate with the substrate to provide reliable support for the electrode assembly.

[0038] By adopting the above solution, when at least one main folding piece is provided with a first through hole, the bottom support plate does not need to be provided with an electrolyte infiltration channel. Based on this, at least one distinguishing hole can be provided on the bottom support plate, so that a differentiated mark or logo can be formed through the distinguishing hole, so that the bottom support plate and the substrate can be clearly distinguished. As a result, during the assembly process of the bottom support plate and the insulating shell, the bottom support plate can be distinguished and identified quickly, accurately and reliably, so as to reduce the risk of missing the bottom support plate on the bottom side of the insulating shell, thereby facilitating the improvement of the assembly yield and assembly efficiency between the bottom support plate and the insulating shell.

[0039] In a second aspect, a battery is provided, the battery comprising the battery cell provided in the embodiment of the present application.

[0040] By adopting the above solution, the battery can improve the reliability and service life of the battery by applying the battery cells provided in the embodiments of the present application.

[0041] In a third aspect, an electrical device is provided, which includes the battery provided in an embodiment of the present application, or the battery cell provided in an embodiment of the present application.

[0042] By adopting the above solution, the electrical device can improve the reliability and service life of the electrical device by applying the battery or battery cell provided in the embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0045] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0046] Figure 3 An exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0047] Figure 4 An exploded schematic diagram of an insulating shell and a bottom support plate provided in some embodiments of the present application, wherein the base sheet is provided with a first through hole, and the bottom support plate is not provided with a second through hole;

[0048] Figure 5 Schematic diagrams of the exploded view of the insulating shell and the bottom support plate provided in some other embodiments of the present application, wherein the substrate is provided with a first through hole, the bottom support plate is provided with a second through hole, and the second through hole is staggered with the first through hole along the thickness direction of the substrate;

[0049] Figure 6 for Figure 5 Provide a bottom view of the insulation shell and the bottom support plate;

[0050] Figure 7 Schematic diagram of an exploded view of an insulating shell and a bottom support plate provided in some other embodiments of the present application, wherein the substrate is provided with a first through hole, the bottom support plate is provided with a second through hole, and the shape of the second through hole is different from that of the first through hole;

[0051] Figure 8 Schematic diagram of an exploded view of an insulating shell and a bottom support plate provided in some other embodiments of the present application, wherein a first through hole is provided on a side of the main folding plate close to the base plate;

[0052] Fig. 9 for Figure 8 A front view of the provided insulating housing;

[0053] Fig.10 for Fig. 9 A schematic diagram of the structure of the provided insulating shell in an expanded state;

[0054] Fig.11 Schematic diagrams of the decomposition of the insulating shell and the bottom support plate provided for other embodiments of the present application, wherein a first through hole is provided on a side of the main folding piece close to the base sheet, and a distinguishing hole is provided on the bottom support plate.

[0055] Among them, the reference numerals in the figure are:

[0056] 1-battery, 2-controller, 3-motor; 100-battery unit, 200-box, 201-first part, 202-second part;

[0057] 10-battery cell, 11-housing, 111-shell, 112-end cover; 12-electrode assembly, 121-electrode body, 122-ear, 122a-positive electrode ear, 122b-negative electrode ear; 13-insulating shell, 131-shell body, 1311-substrate, 13111-first positioning hole, 1312-main folding piece, 13121-first folding line, 1313-side folding piece; 1314-first hole group, 13141-first through hole; 132-extension folding piece; 14-bottom support plate , 141-second hole group, 1411-second through hole, 142-second positioning hole, 143-differentiation hole; 15-insulating member; 16-electrode terminal, 16a-positive electrode terminal, 16b-negative electrode terminal; 17-converter, 17a-positive electrode converter, 17b-negative electrode converter; 18-explosion-proof valve; a-first direction, b-second direction, d1-minimum spacing between the second through hole and the first through hole adjacent to it along the first direction, d2-minimum distance from the first through hole of the main fold to the substrate. DETAILED DESCRIPTION

[0058] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clear and understandable, the application is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0059] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] A battery cell is the smallest unit for storing and outputting electrical energy. A battery cell includes a housing, an electrode assembly, an electrolyte, and an insulating shell arranged in the housing. The electrode assembly is contained in the insulating shell, and the insulating shell is used to insulate and isolate the electrode assembly from the housing. The electrolyte is used to soak the electrode assembly.

[0063] In some cases, the insulating shell is provided with an extended flap for sealing its own seam gap, so that the insulating shell covers the electrode assembly relatively comprehensively and reliably, which can reduce the risk of the electrode assembly contacting the outer shell through the seam gap of the insulating shell, and can reduce the risk of outer shell corrosion caused by direct contact between the electrode assembly and the outer shell. However, the relatively comprehensive and reliable covering of the insulating shell will make it difficult for the electrolyte on the outside of the insulating shell to enter the inside of the insulating shell, resulting in the risk that part of the electrode assembly may not be infiltrated by the electrolyte.

[0064] Therefore, the embodiment of the present application provides a battery cell, which can be relatively fully and reliably covered on the outside of the electrode assembly by an insulating shell, and reliably insulate and isolate the electrode assembly and the shell, so as to improve the insulation effect of the insulating shell between the electrode assembly and the shell, and reduce the risk of shell corrosion caused by direct contact between the electrode assembly and the shell. On this basis, a first through hole can be opened at the bottom of the insulating shell to form an electrolyte infiltration channel through the first through hole, so that the electrolyte that sinks to the bottom of the insulating shell due to gravity can enter from the outside of the insulating shell to the inside of the insulating shell through the first through hole, and can fully infiltrate the electrode assembly in the insulating shell, thereby improving the electrolyte infiltration effect on the electrode assembly and improving the reliability of the battery cell.

[0065] The battery cell disclosed in the embodiment of the present application may be a lithium-ion secondary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc. The battery cell may be cylindrical, flat, rectangular, or in other shapes, etc. The battery cell may be packaged in different ways to form a cylindrical battery cell, a square battery cell, or a soft-pack battery cell, etc.

[0066] The battery cells disclosed in the embodiments of the present application can be used independently or in combination with other battery cells to form a modular battery that can provide higher voltage and capacity, such as a battery module, a battery module or a battery pack.

[0067] The battery cells and batteries disclosed in the embodiments of the present application can be used in electrical devices that use battery cells and batteries as power sources, or in various energy storage systems that use battery cells and batteries as energy storage elements. The electrical device may be, but is not limited to, a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like.

[0068] In order to illustrate the technical solution provided by the present application, the following is a detailed description with reference to specific drawings and embodiments, and taking "the electrical device being a vehicle" as an example.

[0069] See also Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1 is provided inside the vehicle, and the battery 1 may be provided at the bottom, head or tail of the vehicle. The battery 1 is used to power the vehicle, for example, the battery 1 can be used as an operating power source for the vehicle. The vehicle may also include a controller 2 and a motor 3, and the controller 2 is used to control the battery 1 to power the motor 3, for example, for starting, navigating and driving the vehicle. Working power requirements.

[0070] In some embodiments of the present application, the battery 1 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0071] See also Figure 2 , Figure 2 The exploded schematic diagram of the battery 1 provided in some embodiments of the present application. The battery 1 comprises a battery cell 100 and a box body 200 , wherein the battery cell 100 is accommodated in the box body 200 .

[0072] The box body 200 is used to provide a storage space for components such as the battery cell 100. The box body 200 can provide dustproof, waterproof and protective protection for the battery cell 100 and other components contained therein, and can reduce the impact of external liquids or other foreign matter on the effectiveness and performance of the battery cell 100 and other components, and can effectively extend the service life of the battery 1.

[0073] Among them, the box body 200 can adopt a variety of structures. In some embodiments, the box body 200 may include a first part 201 and a second part 202, the first part 201 and the second part 202 cover each other, and the first part 201 and the second part 202 jointly define a storage space for accommodating the battery unit 100. The second part 202 may be a hollow structure with one end open, and the first part 201 may be a plate-like structure, and the first part 201 covers the open side of the second part 202, so that the first part 201 and the second part 202 jointly define a storage space; the first part 201 and the second part 202 may also be hollow structures with one side open, and the open side of the first part 201 covers the open side of the second part 202.

[0074] The box body 200 may be in various shapes, such as a cylinder, a cuboid, etc.

[0075] The box body 200 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0076] The battery cell 100 is an energy storage unit that can convert chemical energy into electrical energy. In the battery 1, one battery cell 100 can be provided, or at least two battery cells 100 can be provided. In the case where at least two battery cells 100 are provided, the at least two battery cells 100 can be connected in series, in parallel, or in mixed connection. Mixed connection means that at least two battery cells 100 are connected in series and in parallel.

[0077] The battery unit 100 may be a battery cell 10 (eg Figure 3 As shown). At least two battery cells 10 can be directly connected in series, in parallel or in mixed connection, and then the whole formed by at least two battery cells 10 is accommodated in the box body 200. Among them, the battery cell 10 can be a lithium-ion secondary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc. The battery cell 10 can be cylindrical, flat, rectangular or other shapes, etc. The battery cell 10 can be packaged in different ways to form a cylindrical battery cell, a square battery cell or a soft-pack battery cell, etc.

[0078] Alternatively, the battery unit 100 may be a battery module or a battery module. At least two battery cells 10 may be connected in series, in parallel, or in a hybrid connection to form a modular structure, i.e., a battery module or a battery module; at least two battery modules or battery modules may then be connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 200.

[0079] Of course, the battery 1 may also include other structures, for example, the battery 1 may also include a busbar component (not shown in the figure) for realizing electrical connection between at least two battery cells 100. For another example, the battery 1 may also include a power distribution device (not shown in the figure) for serving as a control unit for distributing energy of the battery 1 and distributing high voltage to the battery 1.

[0080] Of course, in some embodiments, the battery 1 may not include the box body 200, but at least two battery cells 10 are electrically connected and formed into a whole through necessary fixing structures and then assembled into an electrical device.

[0081] See also Figure 3 , Figure 3 Schematic diagram of an exploded view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 is the smallest unit for storing and outputting electric energy. The battery cell 10 includes a housing 11, an electrode assembly 12, an insulating shell 13, a bottom support plate 14, an insulating member 15, an electrode terminal 16, an adapter 17, an explosion-proof valve 18, an electrolyte (not shown in the figure), and other components.

[0082] The outer shell 11 is a component that isolates the internal environment of the battery cell 10 from the external environment. The outer shell 11 may include a shell 111 and an end cover 112. The end cover 112 is a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 10 from the external environment. In some embodiments, the shape of the end cover 112 can be adapted to the shape of the shell 111 to match the shell 111. In some embodiments, the end cover 112 can be made of a material with a certain hardness and strength, so that the end cover 112 is not easily deformed when squeezed and collided, so that the battery cell 10 can have a higher structural strength and the reliability performance can also be improved. Among them, the material of the end cover 112 can be diversified, and the end cover 112 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic and other materials.

[0083] The shell 111 is a component used to cooperate with the end cap 112 to form the internal environment of the battery cell 10. The internal environment formed by the shell 111 and the end cap 112 can be used to accommodate the electrode assembly 12, the insulating shell 13, the bottom support plate 14, the insulating member 15, the electrolyte and other components. In some embodiments, the shell 111 and the end cap 112 can be independent components, and an opening can be set on the shell 111, and the end cap 112 is covered at the opening to form the internal environment of the battery cell 10. In some embodiments, the end cap 112 and the shell 111 can also be integrated. Specifically, the end cap 112 and the shell 111 can form a common connection surface before other components are put into the shell. When it is necessary to encapsulate the interior of the shell 111, the end cap 112 is covered with the shell 111. Among them, the shell 111 can be of various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. The shape of the shell 111 can be determined according to the shape and size of the electrode assembly 12. The material of the housing 111 can be varied, and the housing 111 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and other materials.

[0084] The electrode assembly 12 is a component in the battery cell 10 where an electrochemical reaction occurs. One or at least two electrode assemblies 12 may be provided. In the case where multiple electrode assemblies 12 are provided, multiple electrode assemblies 12 may be arranged side by side. The electrode assembly 12 includes a positive electrode sheet (not shown in the figure), a negative electrode sheet (not shown in the figure) and a separator (not shown in the figure), and the separator separates the positive electrode sheet from the negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet may be processed by winding, stacking or other methods to form the electrode assembly 12. In the electrode assembly 12, the portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the electrode body 121 of the electrode assembly 12, and the portions of the positive electrode sheet and the negative electrode sheet not having active materials each constitute a pole ear 122, which is the current transmission end of the electrode assembly 12 for transmitting current. The tab 122 of the positive electrode sheet is the positive electrode tab 122a, and the tab 122 of the negative electrode sheet is the negative electrode tab 122b. The positive electrode tab 122a and the negative electrode tab 122b can be located together at one end of the electrode body 121 or respectively at both ends of the electrode body 121.

[0085] The insulating shell 13 is a shell-like structure with an open top and insulating properties. Each electrode assembly 12 is contained in the insulating shell 13, so that the insulating shell 13 covers the outside of each electrode assembly 12, especially covers the part of each electrode assembly 12 except the top (that is, covers the circumferential side and bottom of each electrode assembly 12). The insulating shell 13 is made of insulating material and has insulating properties. The insulating shell 13 is used to insulate and isolate each electrode assembly 12 from the outer shell 11 to reduce the risk of corrosion of the outer shell 11 caused by direct contact between each electrode assembly 12 and the outer shell 11. Among them, the insulating shell 13 can be made of inorganic insulating materials, such as silicon oxide, silicon nitride, aluminum oxide, aluminum nitride, etc. The insulating shell 13 can also be made of organic insulating materials, such as polyimide, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, etc.

[0086] The bottom support plate 14 is disposed between the bottom of the insulating shell 13 and the outer shell 11 . The bottom support plate 14 is used to strengthen the bottom of the insulating shell 13 so that the bottom of the insulating shell 13 has sufficient strength to provide reliable support for the electrode assembly 12 .

[0087] The electrolyte is the liquid that soaks the electrode assembly 12. The battery cell 10 mainly relies on the movement of active ions between the positive electrode plate and the negative electrode plate to work. When the battery cell 10 is charged, the positive electrode plate will generate active ions, and the active ions provided by the positive electrode plate can penetrate the pores of the diaphragm, move to the negative electrode plate via the electrolyte, and embed into the negative active material of the negative electrode plate. Conversely, when the battery cell 10 is discharged, the active ions embedded in the negative active material of the negative electrode plate escape, and the active ions escaped from the negative electrode plate can penetrate the pores of the diaphragm, move to the positive electrode plate via the electrolyte, and embed into the positive active material of the positive electrode plate. Among them, the active ions can be lithium ions, sodium ions, and the like.

[0088] The electrode terminal 16 is a component electrically connected to the electrode assembly 12 and used to output or input electrical energy. The electrode terminal 16 includes a positive electrode terminal 16a and a negative electrode terminal 16b. The positive electrode terminal 16a is electrically connected to the positive electrode tab 122a of the electrode assembly 12. The negative electrode terminal 16b is electrically connected to the negative electrode tab 122b of the electrode assembly 12. The electrode terminal 16 can be installed in the housing 11 and stabilize the installation position and installation state relative to the housing 11. In some embodiments, the electrode terminal 16 can be installed in the housing 11 by flanging and riveting.

[0089] The adapter 17 is a current collecting member electrically connected between the tab 122 of the electrode assembly 12 and the corresponding electrode terminal 16. The adapter 17 may also be referred to as an adapter connector, a current collecting plate or an adapter sheet, etc. The adapter 17 has a conductive property and is made of a conductive material. The material of the adapter 17 may include aluminum, aluminum alloy, copper, copper alloy, copper-aluminum alloy, etc. The adapter 17 includes a positive electrode adapter 17a and a negative electrode adapter 17b. The positive tab 122a of the electrode assembly 12 may be electrically connected to the positive electrode terminal 16a through the positive electrode adapter 17a, and the negative tab 122b of the electrode assembly 12 may be electrically connected to the negative electrode terminal 16b through the negative electrode adapter 17b to form a current loop. In some embodiments, the adapter 17 may be connected to the tab 122 of the electrode assembly 12 by welding, abutment, etc. The adapter 17 may be connected to the electrode terminal 16 by welding, abutment, etc. The shape of the adapter 17 can be various, such as square, round, special-shaped, etc.

[0090] The insulating member 15 is a component with insulating properties. The insulating member 15 is disposed in the outer shell 11, and in particular, between the electrode assembly 12 and the wall portion of the outer shell 11 having the electrode terminal 16 (e.g., the end cap 112). On the basis that the tab 122 of the electrode assembly 12 and the corresponding electrode terminal 16 can be electrically connected, the insulating member 15 can be used to insulate and isolate the electrode assembly 12 and the wall portion of the outer shell 11 having the electrode terminal 16, so as to reduce the risk of short circuit, current leakage, etc. In addition, the insulating member 15 can also be fixed to the wall portion of the outer shell 11 having the electrode terminal 16, and abut the electrode assembly 12 to fill the gap between the electrode assembly 12 and the wall portion of the outer shell 11, and tightly fix the electrode assembly 12, so as to prevent the electrode assembly 12 from moving or shaking relatively during the use of the battery cell 10, which can be beneficial to maintain the structural integrity of the battery cell 10, and can reduce the risk of loosening or deformation of the electrode assembly 12.

[0091] In some embodiments, an explosion-proof valve 18 may be further provided on the housing 11 , and the explosion-proof valve 18 may be used to release the internal pressure when the internal pressure (or temperature) of the battery cell 10 reaches a threshold value.

[0092] See also Figure 3 , Figure 4 Some embodiments of the present application provide a battery cell 10, which includes a housing 11, an electrode assembly 12, and an insulating shell 13. The insulating shell 13 is accommodated in the housing 11. The electrode assembly 12 is accommodated in the insulating shell 13. A first through hole 13141 is provided at the bottom of the insulating shell 13, and the first through hole 13141 connects the inside and the outside of the insulating shell 13.

[0093] It should be noted that the housing 11 is a component that isolates the internal environment of the battery cell 10 from the external environment. In addition, other related descriptions of the housing 11 can be found in the above text, and will not be repeated here.

[0094] The electrode assembly 12 is a component in the battery cell 10 where an electrochemical reaction occurs. One electrode assembly 12 or at least two electrode assemblies 12 may be provided. In the case where multiple electrode assemblies 12 are provided, multiple electrode assemblies 12 may be arranged side by side. In addition, other related descriptions of the electrode assembly 12 can be referred to above, and will not be repeated here.

[0095] It should also be noted that the insulating shell 13 can be folded to change from an unfolded state to a wrapped state. The insulating shell 13 is in a wrapped state in the battery cell 10. The insulating shell 13 can form a shell-like structure with an open top and insulating properties in the wrapped state. Each electrode assembly 12 can be accommodated in the insulating shell 13, so that the insulating shell 13 can be coated on the outside of each electrode assembly 12, and in particular can be coated on the part of each electrode assembly 12 except the top (that is, the circumferential side and bottom of each electrode assembly 12). The insulating shell 13 and the electrode assembly 12 accommodated in the insulating shell 13 can be accommodated as a whole in the outer shell 11, and the insulating shell 13 can relatively comprehensively and reliably insulate and isolate each electrode assembly 12 from the outer shell 11, so as to reduce the risk of corrosion of the outer shell 11 caused by direct contact between each electrode assembly 12 and the outer shell 11.

[0096] The insulating shell 13 may be made of inorganic insulating materials, such as silicon oxide, silicon nitride, aluminum oxide, aluminum nitride, etc. The insulating shell 13 may also be made of organic insulating materials, such as polyimide, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, etc.

[0097] It should also be noted that the insulating shell 13 has a middle section perpendicular to the gravity direction and located in the middle. Taking the middle section as the dividing interface, the part of the insulating shell 13 located on one side of the middle section along the gravity direction is the bottom of the insulating shell 13.

[0098] At least one first through hole 13141 is provided at the bottom of the insulating shell 13. The first through hole 13141 passes through the corresponding wall portion of the insulating shell 13 (i.e., the wall portion of the insulating shell 13 provided with the first through hole 13141) to connect the inside and outside of the insulating shell 13. Based on this, the first through hole 13141 can be used as an infiltration channel for the electrolyte, for the electrolyte outside the insulating shell 13 to enter the inside of the insulating shell 13 along the first through hole 13141, so as to enable the electrode assembly 12 in the insulating shell 13 to be infiltrated by the electrolyte.

[0099] Among them, at least one first through hole 13141 can be provided. The first through hole 13141 can be provided on any wall portion of the insulating shell 13 as required, such as the peripheral side wall portion and the bottom side wall portion. The shape of the first through hole 13141 can be flexibly designed, for example, the first through hole 13141 can be a circular hole, a rectangular hole, etc.

[0100] In summary, the battery cell 10 provided in the embodiment of the present application can be relatively fully and reliably covered on the outside of the electrode assembly 12 by the insulating shell 13, and the electrode assembly 12 and the outer shell 11 can be reliably insulated and isolated, so as to improve the insulation effect of the insulating shell 13 between the electrode assembly 12 and the outer shell 11, and reduce the risk of corrosion of the outer shell 11 caused by direct contact between the electrode assembly 12 and the outer shell 11. On this basis, a first through hole 13141 can be opened at the bottom of the insulating shell 13 to form an electrolyte infiltration channel through the first through hole 13141, so as to promote the electrolyte that sinks to the bottom of the insulating shell 13 due to gravity to enter from the outside of the insulating shell 13 to the inside of the insulating shell 13 through the first through hole 13141, and can fully infiltrate the electrode assembly 12 in the insulating shell 13, thereby improving the electrolyte infiltration effect on the electrode assembly 12, and improving the reliability of the battery cell 10.

[0101] See also Figure 3 , Figure 4 In some embodiments of the present application, the insulating shell 13 includes a shell body 131 and an extension folding piece 132, the electrode assembly 12 is accommodated in the shell body 131, the shell body 131 has a substrate 1311 supporting the electrode assembly 12, the extension folding piece 132 is connected to one side of the substrate 1311 along the first direction a, the extension folding piece 132 is folded to the corresponding side of the shell body 131 along the first direction a, and covers the gap between the corresponding side of the shell body 131 along the first direction a and the substrate 1311, and a first through hole 13141 is provided at the bottom of the shell body 131.

[0102] It should be noted that the shell body 131 is the shell-shaped main body of the insulating shell 13. That is, the shell body 131 is a shell-shaped structure with an open top, and each electrode assembly 12 is accommodated in the shell body 131. The shell body 131 includes a substrate 1311, and the substrate 1311 is provided with a substrate 1311, which is coated on the bottom of each electrode assembly 12 and supports each electrode assembly 12. The shape of the substrate 1311 can be designed in a variety of ways, such as being rectangular, etc.

[0103] It should also be noted that the base sheet 1311 is provided with an extension flap 132 on at least one side along the first direction a, that is, the base sheet 1311 is provided with an extension flap 132 on one side along the first direction a (that is, one extension flap 132 is provided), or the base sheet 1311 is provided with extension flaps 132 on two opposite sides along the first direction a (that is, two extension flaps 132 are provided). The extension flap 132 and the base sheet 1311 may be integrally connected, and the extension flap 132 and the base sheet 1311 may be connected via a fold line (such as a marking line, a weakened mark, a dotted printed line, etc. formed by printing).

[0104] In the wrapped state of the insulating shell 13, the extended folded piece 132 can be bent along the fold line between the extended folded piece 132 and the base sheet 1311 to the corresponding side of the shell body 131 along the first direction a (i.e., the side of the shell body 131 along the first direction a corresponding to the extended folded piece 132) relative to the base sheet 1311. Based on this, the extended folded piece 132 can mainly cover the corner area between the corresponding side of the shell body 131 along the first direction a and the base sheet 1311, so as to cover the gap between the corresponding side of the shell body 131 along the first direction a and the base sheet 1311. Thus, the electrode assembly 12 and the outer shell 11 can be insulated and isolated by the extended folding piece 132 at the gap between the corresponding side of the shell body 131 along the first direction a and the substrate 1311, thereby improving the insulation effect of the insulating shell 13 between the electrode assembly 12 and the outer shell 11, reducing the risk of the electrode assembly 12 contacting the outer shell 11 through the gap between the corresponding side of the shell body 131 along the first direction a and the substrate 1311, and reducing the risk of corrosion of the outer shell 11 due to direct contact between the electrode assembly 12 and the outer shell 11.

[0105] like Figure 3 , Figure 4 As shown, in some embodiments, on the side of the shell body 131 corresponding to the extension folding piece 132 along the first direction a, the shell body 131 may be provided with two side folding pieces 1313, so that the two side folding pieces 1313 jointly form the side wall portion of the shell body 131, and the two side folding pieces 1313 jointly form a covering for the side of each electrode assembly 12. The edges of the two side folding pieces 1313 that are close to each other may border each other or overlap each other. In this case, the extension folding piece 132 may be folded to the outside of the two side folding pieces 1313 (i.e., as shown in FIG. 1 ). Figure 4 As shown in the scheme), it can also be folded between the two side fold pieces 1313, or it can be folded to the inner side of the two side fold pieces 1313.

[0106] In other embodiments, the shell body 131 may be provided with a side folding piece 1313 on one side of the shell body 131 corresponding to the extension folding piece 132 along the first direction a, so that the side wall of the shell body 131 is formed by the side folding piece 1313, and the side of each electrode assembly 12 is covered by the side folding piece 1313. In this case, the extension folding piece 132 may be folded to the outside of the side folding piece 1313, or to the inside of the side folding piece 1313.

[0107] It should also be noted that, based on the structural setting of the above-mentioned insulating shell 13, this embodiment arranges the first through hole 13141 at the bottom of the shell body 131, so that on the basis of improving the insulation effect of the insulating shell 13 through the extended folding piece 132, the first through hole 13141 is used as an infiltration channel for the electrolyte, while taking into account the infiltration effect of the electrolyte on the electrode assembly 12.

[0108] The first through hole 13141 may be disposed on any wall portion of the shell body 131 , for example, on the base sheet 1311 , the side folding sheet 1313 , and the main folding sheet 1312 of the shell body 131 .

[0109] By adopting the above scheme, the insulating shell 13 can accommodate the electrode assembly 12 through the shell body 131, and form a relatively comprehensive and reliable coating on the bottom and the surrounding side of the electrode assembly 12. On this basis, the insulating shell 13 can also bend the extension folding piece 132 relative to the substrate 1311 to the corresponding side of the shell body 131 along the first direction a, so as to cover the corner area between the corresponding side of the shell body 131 along the first direction a and the substrate 1311 through the extension folding piece 132, and cover the gap between the corresponding side of the shell body 131 along the first direction a and the substrate 1311. Based on this, the electrode assembly 12 and the outer shell 11 can be reliably insulated and isolated at the gap between the corresponding side of the shell body 131 along the first direction a and the substrate 1311 through the extension folding piece 132. In this way, the comprehensiveness and reliability of the insulating shell 13 covering the electrode assembly 12 can be improved, the insulating effect of the insulating shell 13 between the electrode assembly 12 and the outer shell 11 can be improved, the risk of the electrode assembly 12 contacting the outer shell 11 through the gap between the corresponding side of the shell body 131 along the first direction a and the substrate 1311 can be reduced, and the risk of corrosion of the outer shell 11 due to direct contact between the electrode assembly 12 and the outer shell 11 can be reduced.

[0110] The insulating shell 13 adopts a structural design of a shell body 131 and an extended folding piece 132 to improve the insulating effect of the insulating shell 13 between the electrode assembly 12 and the outer shell 11. The insulating shell 13 also sets a first through hole 13141 at the bottom of the shell body 131 to form an electrolyte infiltration channel through the first through hole 13141, so that the electrolyte can enter from the outside of the shell body 131 to the inside of the shell body 131 through the first through hole 13141, thereby taking into account and optimizing the insulating effect of the insulating shell 13 and the electrolyte infiltration effect on the electrode assembly 12.

[0111] See also Figure 3 , Figure 4 In some embodiments of the present application, the substrate 1311 is provided with a first through hole 13141 .

[0112] It should be noted that, based on the previous embodiment, the first through hole 13141 can be provided on the substrate 1311, and the first through hole 13141 can penetrate the substrate 1311, so as to realize the first through hole 13141 is provided at the bottom of the shell body 131. Among them, the substrate 1311 can be provided with at least one first through hole 13141. The first through holes 13141 can be arranged on the substrate 1311 as needed and flexibly (for example, linear arrangement, matrix arrangement, circular array, irregular arrangement, etc.). The first through hole 13141 can penetrate the substrate 1311 along the thickness direction of the substrate 1311.

[0113] By adopting the above solution, on the basis of the structural design of the shell body 131 and the extended folded piece 132 of the insulating shell 13 to improve the insulation effect of the insulating shell 13 between the electrode assembly 12 and the outer shell 11, the shell body 131 can form an electrolyte infiltration channel on the bottom surface of the shell body 131 by penetrating the first through hole 13141 in the substrate 1311. Based on this, the electrolyte that sinks to the bottom of the insulating shell 13 due to gravity can smoothly and reliably enter the shell body 131 from the outside of the shell body 131 to the inside of the shell body 131 along the first through hole 13141 of the substrate 1311, thereby improving the electrolyte infiltration effect on the electrode assembly 12.

[0114] Furthermore, the first through hole 13141 provided on the base sheet 1311 is arranged away from the seam of the insulating shell 13. Based on this, when the insulating shell 13 is in the unfolded state, during the layout design and processing of the first through hole 13141, it is convenient to save consideration of the influence of the bonding structure (such as adhesive tape) at the seam of the insulating shell 13 and the extension folded piece 132 on the layout of the first through hole 13141, thereby facilitating the processing and layout of the first through hole 13141. The seam of the insulating shell 13, i.e., the seam between the side folded piece 1313 of the insulating shell 13 and the extension folded piece 132, can be bonded and fixed via the bonding structure (such as adhesive tape) so that the insulating shell 13 can be maintained in the wrapped state.

[0115] See also Figure 3 , Figure 4 In some embodiments of the present application, the battery cell 10 further includes a bottom support plate 14 , and the bottom support plate 14 is supported on the bottom side of the substrate 1311 .

[0116] It should be noted that the bottom support plate 14 is disposed between the bottom of the insulating shell 13 and the outer shell 11, that is, between the bottom side of the substrate 1311 (that is, the outer side of the substrate 1311 away from the electrode assembly 12) and the outer shell 11. The bottom support plate 14 is used to support the substrate 1311 and strengthen the substrate 1311, so that the substrate 1311 has sufficient strength and can provide reliable support for the electrode assembly 12.

[0117] like Figure 4 As shown, in some embodiments, the substrate 1311 is penetrated with a first positioning hole 13111, and the bottom support plate 14 is penetrated with a second positioning hole 142 corresponding to the first positioning hole 13111. By aligning the second positioning hole 142 with the first positioning hole 13111, the bottom support plate 14 and the substrate 1311 can be mutually aligned and positioned. The shape of the first positioning hole 13111 and the shape of the second positioning hole 142 can be the same, but are not limited to circular holes, rectangular holes, etc.

[0118] By adopting the above scheme, based on the structural design of the insulating shell 13 adopting the shell body 131 and the extended folding piece 132, a bottom support plate 14 can be set on the bottom side of the substrate 1311 to support the substrate 1311 through the bottom support plate 14 and strengthen the substrate 1311, thereby enhancing the comprehensive strength of the substrate 1311 and the bottom support plate 14, so that the bottom support plate 14 can cooperate with the substrate 1311 to provide reliable support for the electrode assembly 12.

[0119] By adopting the above scheme, when the substrate 1311 is provided with the first through hole 13141 and the bottom support plate 14 is not provided with the electrolyte infiltration channel, the electrolyte that sinks to the bottom of the insulating shell 13 due to gravity can be smoothly and reliably entered from the outside of the shell body 131 to the inside of the shell body 131 through the gap between the bottom support plate 14 and the substrate 1311 and the first through hole 13141 of the substrate 1311. Based on this, the infiltration effect of the electrolyte on the electrode assembly 12 can be improved, and the bottom support plate 14 can be blocked between the first through hole 13141 and the shell 11, thereby reducing the risk of the electrode assembly 12 contacting the shell 11 through the first through hole 13141, and reducing the risk of corrosion of the shell 11 due to direct contact between the electrode assembly 12 and the shell 11.

[0120] See also Figure 3 , Figure 5 , Figure 6In some embodiments of the present application, the bottom support plate 14 has a second through hole 1411 extending therethrough.

[0121] It should be noted that, when the substrate 1311 is provided with a first through hole 13141 and the bottom support plate 14 is supported on the bottom side of the substrate 1311, the bottom support plate 14 may be provided with a second through hole 1411, and the second through hole 1411 is made to pass through the bottom support plate 14, so that the second through hole 1411 is used as an electrolyte infiltration channel, and the bottom support plate 14 is also provided with an electrolyte infiltration channel. Based on this, the electrolyte that sinks to the bottom of the insulating shell 13 due to gravity can enter from the outside of the shell body 131 to the inside of the shell body 131 through the second through hole 1411 of the bottom support plate 14 and the first through hole 13141 of the substrate 1311 in sequence.

[0122] The bottom support plate 14 may be provided with at least one second through hole 1411. The second through holes 1411 may be arranged on the bottom support plate 14 flexibly as required (e.g., linear arrangement, matrix arrangement, circular array, irregular arrangement, etc.). The second through hole 1411 may penetrate the bottom support plate 14 along the thickness direction of the bottom support plate 14. The shape of the second through hole 1411 may be flexibly designed, for example, the second through hole 1411 may be a circular hole, a rectangular hole, etc.

[0123] By adopting the above solution, when the substrate 1311 is provided with the first through hole 13141 and the bottom support plate 14 is supported on the bottom side of the substrate 1311, the bottom support plate 14 can also be provided with an electrolyte infiltration channel by penetrating the second through hole 1411 in the bottom support plate 14. Based on this, the electrolyte that sinks to the bottom of the insulating shell 13 due to gravity can smoothly and reliably enter the shell body 131 from the outside to the inside of the shell body 131 through the second through hole 1411 of the bottom support plate 14 and the first through hole 13141 of the substrate 1311, thereby improving the infiltration effect of the electrolyte on the electrode assembly 12.

[0124] See also Figure 3 , Figure 5 , Figure 6 In some embodiments of the present application, along the thickness direction of the substrate 1311 , the second through hole 1411 and the first through hole 13141 are staggered.

[0125] It should be noted that the second through hole 1411 is staggered with the first through hole 13141 along the thickness direction of the substrate 1311 (ie, staggered or non-aligned). That is, the projection of the second through hole 1411 on the substrate 1311 along the thickness direction of the substrate 1311 is staggered with the first through hole 13141.

[0126] By adopting the above scheme, by displacing the second through hole 1411 and the first through hole 13141 along the thickness direction of the substrate 1311, on the one hand, it is convenient for the electrolyte that sinks to the bottom of the insulating shell 13 due to gravity to enter the shell body 131 from the outside of the shell body 131 to the inside of the shell body 131 smoothly and reliably through the second through hole 1411 of the bottom support plate 14, the gap between the bottom support plate 14 and the substrate 1311, and the first through hole 13141 of the substrate 1311, thereby improving the infiltration effect of the electrolyte on the electrode assembly 12. On the other hand, it can reduce the risk of the second through hole 1411 and the first through hole 13141 being aligned and forming a straight-through channel, reduce the risk of the electrode assembly 12 contacting the shell 11 through the straight-through channel formed by the alignment of the second through hole 1411 and the first through hole 13141, and reduce the risk of the shell 11 being corroded due to the direct contact between the electrode assembly 12 and the shell 11.

[0127] Of course, in other embodiments, if the risk of contact between the electrode assembly 12 and the housing 11 is low and meets the design requirements, the "second through hole 1411 and the first through hole 13141 are aligned along the thickness direction of the substrate 1311" can be designed as needed.

[0128] See also Figure 3 , Figure 5 , Figure 6 In some embodiments of the present application, the substrate 1311 is provided with a plurality of first through holes 13141 arranged in a matrix, wherein the plurality of first through holes 13141 arranged at intervals along the second direction b together form a first hole group 1314, and the second direction b is perpendicular to the first direction a. The bottom support plate 14 is provided with a plurality of second through holes 1411 arranged in a matrix, wherein the plurality of second through holes 1411 arranged at intervals along the second direction b together form a second hole group 141. The second hole group 141 and the first hole group 1314 are arranged alternately along the first direction a.

[0129] It should be noted that the substrate 1311 is penetrated by a plurality of first through holes 13141, and the plurality of first through holes 13141 are arranged in a matrix on the substrate 1311. Among the first through holes 13141 of the substrate 1311, a plurality of first through holes 13141 arranged at intervals along the second direction b, that is, a row of first through holes 13141 arranged along the second direction b, together form a first hole group 1314. The first through holes 13141 of the substrate 1311 can be divided into at least one first hole group 1314. The first direction a and the second direction b are both parallel to the substrate 1311, and the second direction b is perpendicular to the first direction a.

[0130] The bottom support plate 14 has a plurality of second through holes 1411 extending therethrough, and the plurality of second through holes 1411 are arranged in a matrix on the bottom support plate 14. Among the second through holes 1411 of the bottom support plate 14, the plurality of second through holes 1411 arranged at intervals along the second direction b, that is, a row of second through holes 1411 arranged along the second direction b, together form a second hole group 141. The second through holes 1411 of the bottom support plate 14 can be divided into at least one second hole group 141.

[0131] The second hole group 141 and the first hole group 1314 are arranged alternately along the first direction a, that is, along the first direction a, the second hole group 141 and the first hole group 1314 are arranged alternately in the form of "second hole group 141, first hole group 1314, second hole group 141". Figure 6 As shown, in some embodiments, each first through hole 13141 of the substrate 1311 can be divided into five first hole groups 1314, and each second through hole 1411 of the bottom support plate 14 can be divided into six second hole groups 141, and the six second hole groups 141 are arranged at intervals along the first direction a, and a first hole group 1314 is provided between each two adjacent second hole groups 141.

[0132] By adopting the above scheme, the layout of each first through hole 13141 of the substrate 1311 and the layout of each second through hole 1411 of the bottom support plate 14 can be regularized and comprehensively optimized. Based on this, on the one hand, it is convenient for the electrolyte that sinks to the bottom of the insulating shell 13 due to gravity to smoothly and quickly enter from the outside of the shell body 131 to the inside of the shell body 131 through the second through holes 1411 arranged in a matrix on the bottom support plate 14, the gap between the bottom support plate 14 and the substrate 1311, and the first through holes 13141 arranged in a matrix on the substrate 1311, and evenly and widely distributed in various areas in the shell body 131, and comprehensively and reliably infiltrate various areas of the electrode assembly 12, thereby improving the infiltration effect of the electrolyte on the electrode assembly 12. On the other hand, the second hole group 141 and the first hole group 1314 can be regularly staggered, and the electrode assembly 12 can be reliably prevented from directly contacting the outer shell 11 via the staggered second hole group 141 and the first hole group 1314, thereby greatly reducing the risk of corrosion of the outer shell 11 due to direct contact between the electrode assembly 12 and the outer shell 11 while improving the wetting effect of the electrolyte on the electrode assembly 12.

[0133] Of course, in other embodiments, the first through holes 13141 of the substrate 1311 and the second through holes 1411 of the bottom support plate 14 may be arranged in other ways.

[0134] See also Figure 3 , Figure 5 , Figure 6In some embodiments of the present application, a minimum distance d1 between the second through hole 1411 and the first through hole 13141 adjacent to the second through hole 1411 along the first direction a is greater than or equal to 1 mm.

[0135] It should be noted that, in the first through hole 13141 provided in the substrate 1311 and the second through hole 1411 provided in the bottom support plate 14, the minimum spacing d1 between the second through hole 1411 and the first through hole 13141 adjacently provided along the first direction a is the minimum spacing between the hole edges of the two holes, rather than the hole center distance between the two holes. d1≥1mm, for example, d1 can be 1mm, 1.5mm, 2mm, etc.

[0136] Since the area of ​​the substrate 1311 is limited, the first through hole 13141 is provided on the substrate 1311, the area of ​​the bottom support plate 14 is limited, the second through hole 1411 is provided on the bottom support plate 14, and the second through hole 1411 and the first through hole 13141 are staggered along the thickness direction of the substrate 1311, the upper limit value of d1 cannot be infinite. For example, if the second through hole 1411 is located between the edge of the substrate 1311 along the first direction a and the first through hole 13141, then the second through hole 1411 is at most close to the edge of the substrate 1311 along the first direction a, and cannot be infinitely far from the first through hole 13141. For another example, the second through hole 1411 is located between two first through holes 13141 spaced apart along the first direction a, and the minimum spacing between the second through hole 1411 and the two first through holes 13141 can respectively meet the requirement of d1 ≥ 1 mm, but the spacing between the second through hole 1411 and any one of the two first through holes 13141 cannot be infinite. Therefore, this embodiment does not limit the upper limit of d1, and the upper limit of d1 can be set according to specific application scenarios.

[0137] By adopting the above scheme, when the substrate 1311 is provided with a first through hole 13141, the bottom support plate 14 is provided with a second through hole 1411, and the second through hole 1411 and the first through hole 13141 are staggered along the thickness direction of the substrate 1311, by making the minimum spacing d1 between the second through hole 1411 and the first through hole 13141 adjacent to each other along the first direction a greater than or equal to 1 mm, the second through hole 1411 and the first through hole 13141 adjacent to each other along the first direction a can be staggered by a sufficient distance. Based on this, after the electrolyte enters the second through hole 1411 of the bottom support plate 14, it needs to flow a certain distance along the gap between the bottom support plate 14 and the substrate 1311, and then enter the inner side of the shell body 131 along the first through hole 13141 of the substrate 1311; conversely, it can also make it difficult for the active material (such as carbon powder) of the electrode assembly 12 to directly overlap the outer shell 11 through the staggered first through hole 13141 and the second through hole 1411, thereby greatly reducing the risk of direct contact between the electrode assembly 12 and the outer shell 11, and reducing the risk of corrosion of the outer shell 11 due to direct contact between the electrode assembly 12 and the outer shell 11.

[0138] This embodiment is suitable for application in combination with the previous embodiment. When the second hole groups 141 and the first hole groups 1314 are alternately arranged along the first direction a, d1 may be the minimum spacing between adjacent second hole groups 141 and first hole groups 1314 along the first direction a.

[0139] See also Figure 7 In some embodiments of the present application, the shape of the second through hole 1411 is different from the shape of the first through hole 13141.

[0140] It should be noted that the first through hole 13141 provided in the base sheet 1311 and the second through hole 1411 provided in the bottom support plate 14 have a shape that is different from that of the first through hole 13141. Figure 7 As shown, the second through hole 1411 is a rectangular hole, and the first through hole 13141 is a circular hole.

[0141] By adopting the above solution, when the substrate 1311 is provided with the first through hole 13141 and the bottom support plate 14 is provided with the second through hole 1411, by making the shape of the second through hole 1411 different from the shape of the first through hole 13141, it is convenient to form a differentiated mark or logo through the second through hole 1411 and the first through hole 13141, so that the bottom support plate 14 and the substrate 1311 are clearly distinguished. Based on this, it is convenient to distinguish and identify the bottom support plate 14 quickly, accurately and reliably during the assembly process of the bottom support plate 14 and the insulating shell 13, so as to reduce the risk of missing the bottom support plate 14 on the bottom side of the insulating shell 13, thereby facilitating the improvement of the assembly yield and assembly efficiency between the bottom support plate 14 and the insulating shell 13.

[0142] This embodiment is particularly suitable for the operation scenario where the bottom support plate 14 and the insulating shell 13 are automatically assembled by automated equipment. This embodiment is particularly suitable for the situation where the color of the bottom support plate 14 is the same as the color of the insulating shell 13 and is difficult to distinguish, such as the situation where the bottom support plate 14 and the insulating shell 13 are both transparent parts.

[0143] This embodiment is suitable for application in combination with the related embodiment of "the second through hole 1411 and the first through hole 13141 are staggered along the thickness direction of the substrate 1311". Combined with the shape difference and staggered distribution between the second through hole 1411 and the first through hole 13141, the difference between the bottom support plate 14 and the substrate 1311 can be expanded, thereby facilitating the rapid, accurate and reliable differentiation and identification of the bottom support plate 14.

[0144] Of course, in other embodiments, other methods (such as color, logo, etc.) can be used to distinguish and identify the bottom support plate 14 and the substrate 1311.

[0145] See also Figure 3 , Figure 8 , Fig. 9 , Fig.10 In some embodiments of the present application, the shell body 131 includes two main folding pieces 1312, which are disposed on opposite sides of the base sheet 1311 along the second direction b, and the second direction b is perpendicular to the first direction a. A first through hole 13141 is disposed on a side of at least one main folding piece 1312 close to the base sheet 1311.

[0146] It should be noted that the shell body 131 is provided with two main folding pieces 1312. The two main folding pieces 1312 are arranged on opposite sides of the substrate 1311 along the second direction b. Each main folding piece 1312 can be integrally connected to the substrate 1311, and each main folding piece 1312 can be connected to the substrate 1311 through a first fold line 13121. The first fold line 13121 can be a marking line, a weakened mark, a dotted printed line, etc. printed on the insulating shell 13. In the coated state of the insulating shell 13, each main folding piece 1312 is bent about 90° relative to the substrate 1311 along the first fold line 13121. The two main folding pieces 1312 can respectively form two wall portions of the shell body 131 along the second direction b, so as to form a coating for the electrode assembly 12 on opposite sides of the shell body 131 along the second direction b. The shape of the main folding piece 1312 can be designed in a variety of ways, for example, it can be rectangular, etc.

[0147] The main flap 1312 is close to one side of the base sheet 1311, that is, the bottom side and the bottom of the main flap 1312. Based on this, a first through hole 13141 can be set at the bottom of at least one main flap 1312, and the first through hole 13141 passes through the main flap 1312, so as to realize the first through hole 13141 being set at the bottom of the shell body 131. Among them, at least one main flap 1312 is provided with the first through hole 13141, that is: one main flap 1312 can be provided with the first through hole 13141, and two main flaps 1312 can also be provided with the first through hole 13141.

[0148] The main folding piece 1312 may be provided with at least one first through hole 13141. The first through holes 13141 may be arranged on the main folding piece 1312 in a flexible manner as required (e.g., linear arrangement, matrix arrangement, circular array, irregular arrangement, etc.). Figure 8 , Fig. 9 As shown, in some embodiments, the main fold 1312 is provided with a plurality of first through holes 13141 spaced apart along the first direction a.

[0149] Among them, the first through hole 13141 can penetrate the main folding piece 1312 along the thickness direction of the main folding piece 1312.

[0150] The first direction a and the second direction b are both parallel to the substrate 1311 , and the second direction b is perpendicular to the first direction a.

[0151] By adopting the above scheme, on the basis of the structural design of the shell body 131 and the extended folding piece 132 of the insulating shell 13 to improve the insulation effect of the insulating shell 13 between the electrode assembly 12 and the outer shell 11, the shell body 131 can form an electrolyte infiltration channel on the large surface of the shell body 131 with a larger area by penetrating the first through hole 13141 at the bottom of at least one main folding piece 1312. Based on this, on the one hand, since the main folding piece 1312 is a large surface of the shell body 131 with a larger area, the influence of the setting of the first through hole 13141 on the strength of the main folding piece 1312 can be reduced, so that the processing of the first through hole 13141 can be facilitated, and the reliability of the use of the insulating shell 13 can be improved. On the other hand, it can facilitate the electrolyte that sinks to the bottom of the insulating shell 13 due to gravity to smoothly and reliably enter the shell body 131 from the outside of the shell body 131 to the inside of the shell body 131 along the first through hole 13141 at the bottom of the main folding piece 1312, so as to improve the infiltration effect of the electrolyte on the electrode assembly 12.

[0152] Furthermore, the first through hole 13141 provided on the main folding piece 1312 will be arranged away from the seam of the insulating shell 13. Based on this, when the insulating shell 13 is in the unfolded state, during the layout design and processing of the first through hole 13141, it is unnecessary to consider the influence of the bonding structure (such as tape) at the seam of the insulating shell 13 and the extended folding piece 132 on the layout of the first through hole 13141, thereby facilitating the processing and layout of the first through hole 13141.

[0153] The embodiments related to “the main folding piece 1312 is provided with a first through hole 13141” and the embodiments related to “the base sheet 1311 is provided with a first through hole 13141” can be set selectively or in combination. That is, the first through hole 13141 can be set only on the side of the main folding piece 1312 close to the base sheet 1311, or only on the base sheet 1311, or both on the side of the main folding piece 1312 close to the base sheet 1311 and on the base sheet 1311.

[0154] Of course, in other embodiments, the shell body 131 may form an electrolyte infiltration channel at the bottom of the shell body 131 by penetrating the first through hole 13141 at the bottom of the side folding piece 1313 .

[0155] See also Figure 3 , Fig. 9 , Fig.10 In some embodiments of the present application, the minimum distance d2 from the first through hole 13141 of the main folding piece 1312 to the base sheet 1311 is 1 mm to 10 mm.

[0156] It should be noted that the minimum distance d2 between the first through hole 13141 provided in the main folding piece 1312 and the base sheet 1311, i.e., the minimum distance from the hole edge (not the hole center) of the first through hole 13141 to the first fold line 13121 (between the main folding piece 1312 and the base sheet 1311), is in the range of 1 mm to 10 mm, i.e., 1 mm ≤ d2 ≤ 10 mm, for example, d2 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0157] By adopting the above scheme, by making the minimum distance d2 from the first through hole 13141 provided in the main folding piece 1312 to the base sheet 1311 range from 1 mm to 10 mm, the first through hole 13141 provided in the main folding piece 1312 can be close to the first folding line 13121 between the main folding piece 1312 and the base sheet 1311, and the first through hole 13141 can be provided at the bottom of the main folding piece 1312. Based on this, the electrolyte that sinks to the bottom of the insulating shell 13 due to gravity can smoothly and quickly enter from the outside of the shell body 131 to the inside of the shell body 131 along the first through hole 13141 at the bottom of the main folding piece 1312, and fully and reliably infiltrate various regions of the electrode assembly 12, thereby improving the infiltration effect of the electrolyte on the electrode assembly 12.

[0158] See also Figure 3 , Fig.11 In some embodiments of the present application, the battery cell 10 further includes a bottom support plate 14 , which is supported on the bottom side of the substrate 1311 , and the bottom support plate 14 is provided with a distinguishing hole 143 , which is used to distinguish the bottom support plate 14 from the substrate 1311 .

[0159] It should be noted that the bottom support plate 14 is disposed between the bottom of the insulating shell 13 and the outer shell 11, that is, between the bottom side of the substrate 1311 (that is, the outer side of the substrate 1311 away from the electrode assembly 12) and the outer shell 11. The bottom support plate 14 is used to support the substrate 1311 and strengthen the substrate 1311, so that the substrate 1311 has sufficient strength and can provide reliable support for the electrode assembly 12.

[0160] like Fig.11 As shown, in some embodiments, the substrate 1311 is penetrated with a first positioning hole 13111, and the bottom support plate 14 is penetrated with a second positioning hole 142 corresponding to the first positioning hole 13111. By aligning the second positioning hole 142 with the first positioning hole 13111, the bottom support plate 14 and the substrate 1311 can be mutually aligned and positioned. The shape of the first positioning hole 13111 and the shape of the second positioning hole 142 can be the same, but are not limited to circular holes, rectangular holes, etc.

[0161] It should also be noted that at least one main fold 1312 is provided with a first through hole 13141 as an electrolyte infiltration channel. In this case, the bottom support plate 14 may not need to be provided with an electrolyte infiltration channel. Based on this, at least one distinguishing hole 143 may be provided on the bottom support plate 14. The distinguishing hole 143 is not used as an electrolyte infiltration channel, but is used to distinguish the bottom support plate 14. Among them, the distinguishing hole 143 can be a through hole (i.e., passing through the bottom support plate 14) or a blind hole (i.e., not passing through the bottom support plate 14). The shape of the distinguishing hole 143 can be designed in a variety of ways, and the distinguishing hole 143 can be, but is not limited to, a circular hole, a rectangular hole, etc.

[0162] By adopting the above scheme, based on the structural design of the insulating shell 13 adopting the shell body 131 and the extended folding piece 132, a bottom support plate 14 can be set on the bottom side of the substrate 1311 to support the substrate 1311 through the bottom support plate 14 and strengthen the substrate 1311, thereby enhancing the comprehensive strength of the substrate 1311 and the bottom support plate 14, so that the bottom support plate 14 can cooperate with the substrate 1311 to provide reliable support for the electrode assembly 12.

[0163] By adopting the above solution, when at least one main folding piece 1312 is provided with a first through hole 13141, the bottom support plate 14 does not need to be provided with an electrolyte infiltration channel. Based on this, at least one distinguishing hole 143 can be provided on the bottom support plate 14, so that a differentiated mark or logo can be formed through the distinguishing hole 143, so that the bottom support plate 14 and the substrate 1311 can be clearly distinguished. As a result, during the assembly process of the bottom support plate 14 and the insulating shell 13, the bottom support plate 14 can be distinguished and identified quickly, accurately and reliably, so as to reduce the risk of missing the bottom support plate 14 on the bottom side of the insulating shell 13, thereby facilitating the improvement of the assembly yield and assembly efficiency between the bottom support plate 14 and the insulating shell 13.

[0164] This embodiment is particularly suitable for the operation scenario where the bottom support plate 14 and the insulating shell 13 are automatically assembled by automated equipment. This embodiment is particularly suitable for the situation where the color of the bottom support plate 14 is the same as the color of the insulating shell 13 and is difficult to distinguish, such as the situation where the bottom support plate 14 and the insulating shell 13 are both transparent. This embodiment is particularly suitable for the situation where the substrate 1311 and the bottom support plate 14 do not need to be provided with an electrolyte infiltration channel.

[0165] See also Figure 3 , Figure 5 , Figure 6 , Figure 7 In summary, the present application provides a specific example of a battery cell 10 in the embodiment described above. The battery cell 10 includes a housing 11, an electrode assembly 12, an insulating shell 13, and a bottom support plate 14. At least one electrode assembly 12 is provided and is accommodated in the insulating shell 13. The insulating shell 13 and the electrode assembly 12 accommodated therein are accommodated in the housing 11 together.

[0166] The insulating shell 13 includes a shell body 131 and an extended folding piece 132. The shell body 131 includes a base sheet 1311, a main folding piece 1312, and a side folding piece 1313. The base sheet 1311 forms the bottom surface of the shell body 131, and the base sheet 1311 supports the electrode assembly 12. Two main folding pieces 1312 are provided, and are respectively arranged on opposite sides of the base sheet 1311 along the second direction b to respectively form the wall portion (i.e., the large surface) of the shell body 131 along the second direction b.

[0167] On each side of the shell body 131 along the first direction a: the corresponding sides of the two main folding pieces 1312 are connected to the side folding pieces 1313, that is, two side folding pieces 1313 are provided on the side of the shell body 131. A part of one of the side folding pieces 1313 is folded to the outside of the other side folding piece 1313, so that the two side folding pieces 1313 jointly form the side wall portion of the shell body 131, and jointly cover the corresponding side of the electrode assembly 12.

[0168] Each side of the base sheet 1311 along the first direction a is connected to an extension folding piece 132, that is, the insulating shell 13 is provided with two extension folding pieces 132. The extension folding piece 132 is folded to the outside of the two side folding pieces 1313 on the corresponding side of the shell body 131. The extension folding piece 132 covers the gap between the two side folding pieces 1313 and the base sheet 1311.

[0169] Based on this, the insulating shell 13 can accommodate the electrode assembly 12 through the shell body 131, and form a relatively comprehensive and reliable coating on the bottom and the surrounding side of the electrode assembly 12. On this basis, the insulating shell 13 can also bend the extension folding piece 132 relative to the substrate 1311 to the outer side of the corresponding side of the shell body 131 along the first direction a, so as to cover the corner area between the corresponding side of the shell body 131 along the first direction a and the substrate 1311 through the extension folding piece 132, and cover the gap between the corresponding side of the shell body 131 along the first direction a and the substrate 1311. Based on this, the electrode assembly 12 and the outer shell 11 can be reliably insulated and isolated at the gap between the corresponding side of the shell body 131 along the first direction a and the substrate 1311 through the extension folding piece 132. In this way, the comprehensiveness and reliability of the insulating shell 13 covering the electrode assembly 12 can be improved, the insulating effect of the insulating shell 13 between the electrode assembly 12 and the outer shell 11 can be improved, the risk of the electrode assembly 12 contacting the outer shell 11 through the gap between the corresponding side of the shell body 131 along the first direction a and the substrate 1311 can be reduced, and the risk of corrosion of the outer shell 11 due to direct contact between the electrode assembly 12 and the outer shell 11 can be reduced.

[0170] On this basis, the bottom support plate 14 is supported on the bottom side of the substrate 1311 and can reinforce the substrate 1311 to enhance the combined strength of the substrate 1311 and the bottom support plate 14 , so that the bottom support plate 14 can cooperate with the substrate 1311 to provide reliable support for the electrode assembly 12 .

[0171] On this basis, the substrate 1311 is penetrated by a plurality of first through holes 13141 arranged in a matrix. Among the first through holes 13141 arranged in a matrix, a plurality of first through holes 13141 arranged at intervals along the second direction b together form a first hole group 1314. The bottom support plate 14 is penetrated by a plurality of second through holes 1411 arranged in a matrix. Among the second through holes 1411 arranged in a matrix, a plurality of second through holes 1411 arranged at intervals along the second direction b together form a second hole group 141. The second hole group 141 and the first hole group 1314 are alternately arranged along the first direction a, so that the second through holes 1411 and the first through holes 13141 are staggered along the thickness direction of the substrate 1311. The minimum spacing d1 between the second through hole 1411 and the first through hole 13141 adjacent to it along the first direction a, that is, the minimum spacing between the second hole group 141 and the first hole group 1314 adjacent to it along the first direction a, is configured to be greater than or equal to 1 mm.

[0172] Based on this, the insulating shell 13 can adopt the structural design of the shell body 131 and the extended folding piece 132 to improve the insulation effect of the insulating shell 13 between the electrode assembly 12 and the shell 11, and form an electrolyte infiltration channel through the first through hole 13141 of the substrate 1311 and the second through hole 1411 of the bottom support plate 14. Therefore, on the one hand, it is convenient for the electrolyte that sinks to the bottom of the insulating shell 13 due to gravity to enter the inside of the shell body 131 from the outside of the shell body 131 smoothly and quickly through the second through holes 1411 arranged in a matrix of the bottom support plate 14, the gap between the bottom support plate 14 and the substrate 1311, and the first through holes 13141 arranged in a matrix of the substrate 1311, and evenly and widely distributed in various areas in the shell body 131, and comprehensively and reliably infiltrate various areas of the electrode assembly 12, thereby improving the infiltration effect of the electrolyte on the electrode assembly 12. On the other hand, the second hole group 141 and the first hole group 1314 can be regularly staggered at a certain distance, so that the electrode assembly 12 can be reliably prevented from directly contacting the outer shell 11 through the staggered second hole group 141 and the first hole group 1314, thereby greatly reducing the risk of corrosion of the outer shell 11 due to direct contact between the electrode assembly 12 and the outer shell 11 while improving the wetting effect of the electrolyte on the electrode assembly 12.

[0173] Among them, the shape of the second through hole 1411 is different from the shape of the first through hole 13141. Based on this, it is convenient to form a differentiated mark and logo through the difference in the shape of the second through hole 1411 and the shape of the first through hole 13141, so that the bottom support plate 14 and the substrate 1311 can be clearly distinguished. Therefore, it is convenient to distinguish and identify the bottom support plate 14 quickly, accurately and reliably during the assembly process of the bottom support plate 14 and the insulating shell 13, so as to reduce the risk of missing the bottom support plate 14 on the bottom side of the insulating shell 13, thereby facilitating the improvement of the assembly yield and assembly efficiency between the bottom support plate 14 and the insulating shell 13.

[0174] See also Figure 2 , Figure 3 , Figure 4 Some embodiments of the present application provide a battery 1, and the battery 1 includes a battery cell 10 provided in an embodiment of the present application.

[0175] By adopting the above solution, the battery 1 can improve the reliability and service life of the battery 1 by applying the battery cell 10 provided in the embodiment of the present application.

[0176] See also Figure 1 , Figure 3 Some embodiments of the present application provide an electrical device, which includes a battery 1 provided in an embodiment of the present application, or a battery cell 10 provided in an embodiment of the present application.

[0177] By adopting the above solution, the electrical device can improve the reliability and service life of the electrical device by applying the battery 1 or the battery cell 10 provided in the embodiment of the present application.

[0178] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: The battery cell comprises: shell; Electrode assembly; An insulating shell is accommodated in the outer shell; the electrode assembly is accommodated in the insulating shell; a first through hole is provided at the bottom of the insulating shell, and the first through hole communicates the inside and the outside of the insulating shell.

2. The battery cell according to claim 1, characterized in that: The insulating shell includes a shell body and an extended folding piece, the electrode assembly is accommodated in the shell body, the shell body has a substrate supporting the electrode assembly, the extended folding piece is connected to one side of the substrate along a first direction, the extended folding piece is folded to the corresponding side of the shell body along the first direction, and covers the gap between the corresponding side of the shell body along the first direction and the substrate, and the first through hole is provided at the bottom of the shell body.

3. The battery cell according to claim 2, characterized in that: The substrate is provided with the first through hole.

4. The battery cell according to claim 3, characterized in that: The battery cell further includes a bottom support plate supported on a bottom side of the substrate.

5. The battery cell according to claim 4, characterized in that: The bottom supporting plate is penetrated by a second through hole.

6. The battery cell according to claim 5, characterized in that: Along the thickness direction of the substrate, the second through hole and the first through hole are arranged in a staggered manner.

7. The battery cell according to claim 6, characterized in that: The substrate is provided with a plurality of the first through holes arranged in a matrix, wherein the plurality of the first through holes arranged at intervals along a second direction together form a first hole group, and the second direction is perpendicular to the first direction; The bottom support plate is provided with a plurality of the second through holes arranged in a matrix, wherein the plurality of the second through holes arranged at intervals along the second direction together form a second hole group; the second hole group and the first hole group are alternately arranged along the first direction.

8. The battery cell according to claim 6, characterized in that: A minimum distance between the second through hole and the first through hole adjacent to the second through hole along the first direction is greater than or equal to 1 mm.

9. The battery cell according to any one of claims 5 to 8, characterized in that: The shape of the second through hole is different from that of the first through hole.

10. The battery cell according to any one of claims 2 to 8, characterized in that: The shell body includes two main folding pieces, which are arranged on opposite sides of the base sheet along a second direction, and the second direction is perpendicular to the first direction; The first through hole is provided on a side of at least one of the main folding sheets close to the base sheet.

11. The battery cell according to claim 10, characterized in that: The minimum distance from the first through hole of the main folding sheet to the base sheet is 1 mm to 10 mm.

12. The battery cell according to claim 10, characterized in that: The battery cell further includes a bottom support plate, the bottom support plate is supported on the bottom side of the substrate, and the bottom support plate is provided with a distinguishing hole, and the distinguishing hole is used to distinguish the bottom support plate from the substrate.

13. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 12.

14. An electrical device, characterized in that: The electrical device comprises the battery according to claim 13, or the battery cell according to any one of claims 1-12.

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