Battery monomer, battery device and power utilization device

Abstract

The utility model provides a single battery, a battery device and a power utilization device, a shell of the single battery forms a containing cavity for containing an electrode assembly and comprises a first wall, the first wall is provided with a liquid injection hole penetrating along the thickness direction of the first wall, a first insulating part is arranged on one side, facing the containing cavity, of a cover body, and the first insulating part forms a containing cavity with a second opening; the containing cavity covers the liquid injection hole through the second opening, the first insulating part is provided with a liquid drainage hole communicated with the containing cavity, and the direction of the liquid drainage hole intersects with the direction of the liquid injection hole. Through the structure, the electrolyte injected from the liquid injection hole flows into the accommodating cavity from the liquid discharge hole along the direction intersected with the liquid injection hole after entering the accommodating cavity for buffering, so that the electrolyte injected from the liquid injection hole is not easy to directly wash the electrode assembly, the influence of the injected electrolyte on the electrode assembly is reduced, the service life of the battery monomer is prolonged, and the service life of the battery monomer is prolonged. Therefore, the service life of the battery device is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to a battery monomer, a battery device and an electric device. BACKGROUND

[0002] The battery device has the advantages of high specific energy and high power density, and is widely used in electronic equipment and vehicles, such as mobile phones, notebook computers, electric vehicles, electric vehicles, electric aircraft, electric ships and electric tools.

[0003] With the progress of science and technology, people's requirements for battery devices are also getting higher and higher, and how to improve the service life of battery devices is more and more concerned by the technical personnel in the field. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and an electric device, which has a longer service life and is beneficial to prolong the service life of the battery device.

[0005] In the first aspect, some embodiments of the present application provide a battery monomer, which comprises an electrode assembly, a shell and a first insulating piece, the shell forms a cavity accommodating the electrode assembly, the shell comprises a shell body and a cover body, a first wall is provided with a liquid injection hole penetrating through the thickness direction of the first wall, the first insulating piece is arranged on the side of the first wall facing the cavity, the first insulating piece forms an accommodating cavity with a second opening, the accommodating cavity covers the liquid injection hole through the second opening, the first insulating piece is provided with a liquid discharge hole communicating with the accommodating cavity, and the direction of the liquid discharge hole is arranged intersecting with the direction of the liquid injection hole.

[0006] In the above structure, since the accommodating cavity covers the liquid injection hole through the second opening, and the direction of the liquid discharge hole is arranged intersecting with the direction of the liquid injection hole, the electrolyte injected from the liquid injection hole flows into the cavity along the direction intersecting with the liquid injection hole after being buffered in the accommodating cavity, so that the electrolyte injected from the liquid injection hole is not easy to directly flush the electrode assembly, the influence of the injected electrolyte on the electrode assembly is reduced, which is beneficial to prolong the service life of the battery monomer, thereby prolonging the service life of the battery device.

[0007] According to the battery monomer provided by some embodiments of the present application, a recess is arranged on the inner wall of the accommodating cavity. By arranging the recess on the inner wall of the accommodating cavity, the volume of the accommodating cavity is increased, which is beneficial to improve the capacity of the accommodating cavity to accommodate and buffer the electrolyte.

[0008] According to the battery monomer provided by some embodiments of the present application, the recess is arranged opposite to the second opening. By arranging the recess opposite to the second opening, the recess is arranged on the bottom wall of the accommodating cavity, and the electrolyte injected into the accommodating cavity from the second opening can be directly flushed into the recess for buffering, which is beneficial to improve the capacity of the accommodating cavity to accommodate and buffer the electrolyte.

[0009] According to the battery cell provided by some embodiments of the present application, the recesses are provided in multiple numbers and are arranged at intervals. By arranging multiple recesses at intervals on the inner wall of the accommodating cavity, the multiple recesses can better increase the volume of the accommodating cavity, which is conducive to further improving the capacity of the accommodating cavity to accommodate and buffer the electrolyte.

[0010] According to the battery cell provided by some embodiments of the present application, the drain holes are provided in two groups and are arranged oppositely, so that the drain holes can drain the electrolyte in the accommodating cavity from both sides of the accommodating cavity into the accommodating cavity, so that the electrolyte drained from the accommodating cavity can be uniformly drained into the accommodating cavity, and so that the electrolyte in the accommodating cavity can better soak the electrode assembly.

[0011] According to the battery cell provided by some embodiments of the present application, multiple drain holes are arranged in each group of drain holes, and the drain holes in the two groups of drain holes are arranged correspondingly, so that the two groups of drain holes can uniformly drain the electrolyte in the accommodating cavity to both sides from two opposite directions, so that the electrolyte can uniformly soak the electrode assembly.

[0012] According to the battery cell provided by some embodiments of the present application, the first insulating piece includes a main body part and an accommodating part connected with each other, the main body part is arranged on the surface of the first wall facing the accommodating cavity, the accommodating part protrudes towards the accommodating cavity relative to the main body part and encloses the accommodating cavity, and the accommodating part abuts against the electrode assembly. The accommodating part protrudes towards the accommodating cavity relative to the main body part, so that the accommodating part is more protruding than the main body part and can abut against the electrode assembly to position the electrode assembly in the accommodating cavity, thereby reducing the possibility of damage to the electrode assembly due to shaking in the accommodating cavity.

[0013] According to the battery cell provided by some embodiments of the present application, the surface of the accommodating part facing the electrode assembly is arranged as a plane, and the plane abuts against the electrode assembly, thereby reducing the possibility of damage to the electrode assembly due to stress concentration at the part in contact with the accommodating part.

[0014] According to the battery cell provided by some embodiments of the present application, the first insulating piece further includes an abutting part connected with the main body part, the abutting part protrudes towards the accommodating cavity relative to the main body part, and the abutting part abuts against the electrode assembly to position the electrode assembly in the accommodating cavity, thereby reducing the possibility of damage to the electrode assembly due to shaking in the accommodating cavity.

[0015] According to the battery cell provided by some embodiments of the present application, the shell comprises two first walls arranged opposite to each other along a first direction and two second walls arranged opposite to each other along a second direction, the second walls are connected between the two first walls, the thickness direction, the first direction and the second direction are perpendicular to each other; the distance between the two first walls is greater than the distance between the two second walls, the liquid discharge hole is arranged towards the first wall, so that the electrolyte flowing out of the liquid discharge hole can flow along the direction in which the battery cell has a larger size, and can better adapt to the shape of the battery cell, so that the electrolyte can better fill into the cavity.

[0016] According to the battery cell provided by some embodiments of the present application, the shell is provided with a pressure relief structure, the pressure relief structure is arranged opposite to the first wall, so that the pressure relief structure is not arranged on the first wall, the space occupied by the pressure relief structure on the first wall is reduced, and the arrangement of the components on the first wall is facilitated.

[0017] According to the battery cell provided by some embodiments of the present application, the side of the first wall towards the cavity is provided with a connecting hole, the first insulating piece is provided with a connecting structure, the connecting structure is inserted into the connecting hole, the connecting strength between the first insulating piece and the first wall can be improved, and the possibility of the first insulating piece falling off from the first wall is reduced.

[0018] In a second aspect, some embodiments of the present application provide a battery device, which comprises the battery cell provided by any of the technical solutions.

[0019] In a third aspect, some embodiments of the present application provide a power consumption device, which comprises the battery device provided by the technical solutions, and the battery device is used for providing electric energy.

[0020] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0021] Some embodiments of the present application provide a battery cell, which comprises an electrode assembly, a shell and a first insulating piece, the shell forms a cavity for accommodating the electrode assembly and comprises a first wall, the first wall is provided with a liquid injection hole penetrating along the thickness direction of the first wall, the first insulating piece is arranged on the side of the first wall towards the cavity, the first insulating piece forms an accommodating cavity with a second opening, the accommodating cavity covers the liquid injection hole through the second opening, the first insulating piece is provided with a liquid discharge hole in communication with the accommodating cavity, and the direction of the liquid discharge hole is arranged intersecting with the direction of the liquid injection hole. In the above structure, since the accommodating cavity covers the liquid injection hole through the second opening, and the direction of the liquid discharge hole is arranged intersecting with the direction of the liquid injection hole, the electrolyte injected from the liquid injection hole flows into the cavity along the direction intersecting with the liquid injection hole after being buffered in the accommodating cavity, so that the electrolyte injected from the liquid injection hole is not easy to directly flush the electrode assembly, the influence of the injected electrolyte on the electrode assembly is reduced, and the service life of the battery cell is prolonged, thereby prolonging the service life of the battery device.

[0022] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to depict only preferred embodiments of the application, and therefore should not be considered to narrow the scope of the present application in any way. Similarly, like reference numerals denote like parts throughout the drawings.

[0024] Figure 1 Structure diagram of a vehicle provided by some embodiments of the present application;

[0025] Figure 2 Split diagram of a battery device provided by some embodiments of the present application;

[0026] Figure 3 Top view of a battery cell provided by some embodiments of the present application;

[0027] Figure 4 Structure diagram of a battery cell provided by some embodiments of the present application; Figure 3 Sectional view of D-D in FIG. 6;

[0028] Figure 5 Structure diagram of a battery cell provided by some embodiments of the present application; Figure 4 Sectional view of E-E in FIG. 6;

[0029] Figure 6 Structure diagram of a battery cell provided by some embodiments of the present application;

[0030] Figure 7 Structure diagram of a battery cell provided by some embodiments of the present application;

[0031] In the drawings:

[0032] 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, case; 5a, first case portion; 5b, second case portion; 5c, accommodation space; 7, battery cell; 8, electrode assembly; 81, electrode main body; 82, tab; 9, housing; 90, cavity; 91, housing; 910, first opening; 911, first wall; 912, second wall; 92, cover; 921, liquid injection hole; 922, connection hole; 93, pressure relief structure; 94, first wall; 10, first insulating member; 101, accommodation cavity; 1011, second opening; 102, liquid discharge hole; 103, recess; 104, main body portion; 105, accommodation portion; 1051, flat surface; 106, abutting portion; 107, connection structure; X, first direction; Y, second direction; Z, thickness direction. DETAILED DESCRIPTION

[0033] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0034] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0035] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0036] In addition, the technical terms "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0037] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] At present, from the development of market situation, the application of battery device is more and more widely. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields.

[0040] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cell assemblies to provide higher voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0041] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0042] The battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging the active material for continuous use.

[0043] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead-acid battery cell, etc.

[0044] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive electrode and the negative electrode from shorting while allowing the active ions to pass through.

[0045] In some embodiments, the battery cell further includes an electrolyte. The electrolyte can conduct ions between the positive electrode and the negative electrode. The type of electrolyte is not particularly limited in the present application, and can be selected as needed.

[0046] In some embodiments, the electrolyte includes an electrolyte salt and a solvent.

[0047] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorobisoxalate borate, lithium bisoxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorodioxalate phosphate.

[0048] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and a crown ether.

[0049] In some embodiments, the electrode assembly can be in a wound structure, a stacked structure, or a hybrid structure of the wound and stacked structures.

[0050] In some embodiments, the battery cell can include a housing. The housing can be used to encapsulate the electrode assembly and other components such as the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0051] As an example, the battery cell can be a prismatic battery cell, including a square cell, a blade cell, a multi-prismatic battery cell (e.g., a hexagonal prismatic battery cell), etc. In the embodiments of the present application, the battery cell is a blade cell.

[0052] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap covers the opening. The shell can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0053] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0054] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0055] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0056] In some embodiments, the battery device can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0057] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0058] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0059] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0060] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected with the frame, respectively, so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0061] In some embodiments, the box can be part of the chassis structure of a vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0062] In some embodiments, the battery device can be used in an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0063] Generally, after the battery cell is assembled, electrolyte needs to be injected into the battery cell through the injection hole to soak the electrode assembly, so that the battery cell has the function of charging and discharging. In the prior art, when the electrolyte is injected into the battery cell through the injection hole on the cover, the electrolyte is easy to impact the electrode assembly in the battery cell during the injection process, which affects the service life of the battery cell.

[0064] In order to prolong the service life of the battery cell, some embodiments of the present application provide a battery cell, which comprises an electrode assembly, a shell and a first insulating piece. The shell forms a containing cavity accommodating the electrode assembly and comprises a first wall provided with an injection hole penetrating along the thickness direction of the first wall. The first insulating piece is arranged on the side of the first wall facing the containing cavity and forms a containing cavity with a second opening. The containing cavity covers the injection hole through the second opening. The first insulating piece is provided with a drainage hole in communication with the containing cavity. The direction of the drainage hole is arranged to intersect the direction of the injection hole. In the above structure, since the containing cavity covers the injection hole through the second opening and the direction of the drainage hole is arranged to intersect the direction of the injection hole, the electrolyte injected from the injection hole flows into the containing cavity along the direction intersecting the injection hole after being buffered in the containing cavity. Therefore, the electrolyte injected from the injection hole is not easy to directly flush the electrode assembly, which reduces the influence of the injected electrolyte on the electrode assembly, is beneficial to prolong the service life of the battery cell, and thus prolongs the service life of the battery device.

[0065] The battery cell described in the embodiments of the present application is suitable for a battery device and a power consumption device using the battery device. The battery cell can be used in a battery device, but is not limited to this, and can also be used in vehicles, aircraft, ships, electronic devices, electric tools and other products, which can improve the reliability of these products.

[0066] The power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0067] The following embodiments take a vehicle as an example for convenience of description.

[0068] Figure 1A structural schematic diagram of a vehicle is provided for some embodiments of the present application.

[0069] As shown in Figure 1 , the interior of the vehicle 1 is provided with a battery device 2, which can be arranged at the bottom, head or tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as the operating power supply of the vehicle 1.

[0070] The vehicle 1 can also include a controller 3 and a motor 4, the controller 3 being used to control the battery device 2 to supply power to the motor 4, for example, for the power demand of the vehicle 1 during starting, navigation and driving.

[0071] In some embodiments of the present application, the battery device 2 can not only be used as the operating power supply of the vehicle 1, but also be used as the driving power supply of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0072] Figure 2 A split view of the battery device is provided for some embodiments of the present application. As shown in Figure 2 , the battery device 2 includes a box body 5 and a battery cell 7, and the battery cell 7 is contained in the box body 5. The battery cell 7 can be the smallest unit constituting a battery.

[0073] The box body 5 is used to contain the battery cell 7, and the box body 5 can have various structures. In some embodiments, the box body 5 can include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b are mutually covered, and the first box body part 5a and the second box body part 5b jointly define a containing space 5c for containing the battery cell 7. The second box body part 5b can be a hollow structure with one end open, and the first box body part 5a is a plate-like structure, which is covered on the open side of the second box body part 5b to form the box body 5 with the containing space 5c; or the first box body part 5a and the second box body part 5b can both be a hollow structure with one side open, and the open side of the first box body part 5a is covered on the open side of the second box body part 5b to form the box body 5 with the containing space 5c. Of course, the first box body part 5a and the second box body part 5b can have various shapes, such as a cylinder, a cuboid, etc.

[0074] In order to improve the sealing performance of the first box body part 5a and the second box body part 5b after being connected, a sealing member such as sealing glue, sealing ring, etc. can be arranged between the first box body part 5a and the second box body part 5b.

[0075] Suppose the first box body part 5a is covered on the top of the second box body part 5b, the first box body part 5a can also be called an upper box cover, and the second box body part 5b can also be called a lower box body.

[0076] In the battery device 2, the battery cell 7 can be one or multiple. If the battery cell 7 is multiple, the multiple battery cells 7 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 7 are connected in series and in parallel. The multiple battery cells 7 can be directly connected in series, in parallel or in a mixed manner, and then the multiple battery cells 7 are accommodated in the box 5. Alternatively, the multiple battery cells 7 can be connected in series, in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole and are accommodated in the box 5.

[0077] Some embodiments of the present application provide a battery cell 7, referring to Figures 3 to 5 The battery cell 7 includes an electrode assembly 8, a case 9 and a first insulation member 10. The case 9 forms a cavity 90 for accommodating the electrode assembly 8. The case 9 has a first wall 94. The first wall 94 is provided with a liquid injection hole 921 penetrating through the first wall 94 along a thickness direction Z of the first wall 94, referring to Figure 6 The first insulation member 10 is arranged on a side of the first wall 94 facing the cavity 90. The first insulation member 10 forms an accommodation cavity 101 having a second opening 1011. The accommodation cavity 101 covers the liquid injection hole 921 through the second opening 1011. The first insulation member 10 is provided with a liquid discharge hole 102 communicating with the accommodation cavity 101. The liquid discharge hole 102 is arranged in a direction intersecting with a direction of the liquid injection hole 921.

[0078] The electrode assembly 8 is a component in which electrochemical reactions occur in the battery cell 7. One or more electrode assemblies 8 can be contained in the case 9. The electrode assembly 8 can include an electrode body 81 and a tab 82 extending from a side of the electrode body 81. The tab 82 is used to connect with an electrode terminal on the case 9, so that the electrode assembly 8 can be electrically connected with an external electrical device or a charging device through the electrode terminal.

[0079] The electrode assembly 8 can include a positive electrode tab, a negative electrode tab and a separator. The positive electrode tab and the negative electrode tab can be used as a positive electrode and a negative electrode, respectively. During charging and discharging of the battery cell 7, active ions (e.g. lithium ions) are inserted into and extracted from the positive electrode and the negative electrode. The separator is arranged between the positive electrode tab and the negative electrode tab, and is used to isolate the positive electrode tab and the negative electrode tab. The separator can prevent the positive electrode tab and the negative electrode tab from short-circuiting, and can also allow the active ions to pass through.

[0080] The case 9 can be a component for enclosing a sealed space in the battery cell 7, and is used to accommodate the electrode assembly 8 and other components in the battery cell 7.

[0081] The liquid injection hole 921 can be a hole structure for injecting electrolyte into the cavity 90 of the battery cell 7. The liquid injection hole 921 is formed on the first wall 94 and penetrates through the inside and outside of the battery cell 7 along the thickness direction Z of the first wall 94, so that a liquid injection device can inject liquid into the cavity 90 from the outside of the battery cell 7.

[0082] The first insulation member 10 can be an insulation structure arranged on the surface of the first wall 94 facing the accommodating cavity 90, made of an insulation material and having insulation performance, and is used to buffer and guide the electrolyte injected from the liquid injection hole 921, so as to reduce the impact of the electrolyte injected from the liquid injection hole 921 on the electrode assembly 8.

[0083] The accommodating cavity 101 can be a cavity structure formed by the first insulation member 10 and having a second opening 1011 at one end, and is used to accommodate and buffer the electrolyte. The accommodating cavity 101 covers the liquid injection hole 921 through the second opening 1011, that is, the second opening 1011 of the accommodating cavity 101 is arranged around the outer periphery of the liquid injection hole 921 to cover the liquid injection hole 921, so that the liquid injection hole 921 is in communication with the accommodating cavity 101, and the electrolyte injected from the liquid injection hole 921 can enter the accommodating cavity 101.

[0084] The liquid discharge hole 102 can be a structure for discharging the electrolyte in the accommodating cavity 101 to the accommodating cavity 90, and is used to communicate the accommodating cavity 101 and the accommodating cavity 90. By arranging the direction of the liquid discharge hole 102 to intersect the direction of the liquid injection hole 921, the electrolyte injected from the liquid injection hole 921 first enters the accommodating cavity 101 for buffering, and then is discharged from the liquid discharge hole 102 to the accommodating cavity 90 for impregnating the electrode assembly 8. In this process, the electrolyte not only undergoes buffering in the accommodating cavity 101, but also flows into the accommodating cavity 90 from the liquid discharge hole 102, and the flow direction intersects the thickness direction Z of the first wall 94, so that the flowing electrolyte does not directly impact the electrode assembly 8, reducing the possibility of damage to the electrode assembly 8 and prolonging the service life of the battery monomer 7.

[0085] In the above structure, since the accommodating cavity 101 covers the liquid injection hole 921 through the second opening 1011, and the direction of the liquid discharge hole 102 is arranged to intersect the direction of the liquid injection hole 921, the electrolyte injected from the liquid injection hole 921 enters the accommodating cavity 101 for buffering, and then flows into the accommodating cavity 90 from the liquid discharge hole 102 in a direction intersecting the liquid injection hole 921, so that the electrolyte injected from the liquid injection hole 921 is not easy to directly flush the electrode assembly 8, reducing the influence of the injected electrolyte on the electrode assembly 8, and prolonging the service life of the battery monomer 7, thereby prolonging the service life of the battery device 2.

[0086] Exemplarily, the shell 9 includes a shell body 91 and a cover body 92, the shell body 91 forms the accommodating cavity 90 having the first opening 910, and the electrode assembly 8 is arranged in the accommodating cavity 90, and the cover body 92 covers the first opening 910, and the cover body 92 is configured as the first wall 94.

[0087] The shell 91 and the cover 92 are two parts connected with each other in the shell 9, wherein the shell 91 surrounds a cavity 90 having a first opening 910 at one end, so that the electrode assembly 8 and other components can be arranged in the cavity 90 and conveniently loaded into the cavity 90 from the first opening 910; the cover 92 can be a part for sealing the first opening 910, which is sealed and covered on the first opening 910 to form a sealed space in the cavity 90.

[0088] By configuring the cover 92 as the first wall 94, the liquid injection hole 921 is arranged on the cover 92. Since the volume of the cover 92 is generally smaller than that of the shell 91, arranging the liquid injection hole 921 on the cover 92 makes the part needing to be processed to form the liquid injection hole 921 be the plate-shaped cover 92, so that the liquid injection hole 921 is conveniently processed.

[0089] Exemplarily, the cover 92 is welded to seal the first opening 910, and the cover 92 is welded to the shell 91 near the first opening 910 and fused with the shell 91 to seal the gap between the cover 92 and the shell 91, so that the cover 92 covers and seals the first opening 910.

[0090] In some embodiments, referring to Figure 7 The inner wall of the accommodation cavity 101 is provided with a recess 103.

[0091] The recess 103 can be a recess structure formed by the inner wall of the accommodation cavity 101 being recessed inward, which can increase the volume of the accommodation cavity 101. By providing the recess 103 on the inner wall of the accommodation cavity 101 to increase the volume of the accommodation cavity 101, the capacity of the accommodation cavity 101 to accommodate and buffer the electrolyte is improved.

[0092] In some embodiments, the recess 103 is arranged opposite to the second opening 1011.

[0093] The recess 103 arranged opposite to the second opening 1011 can mean that the recess 103 is arranged on the bottom wall of the accommodation cavity 101. By arranging the recess 103 opposite to the second opening 1011, the electrolyte injected into the accommodation cavity 101 from the second opening 1011 can directly flow into the recess 103 for buffering, which improves the capacity of the accommodation cavity 101 to accommodate and buffer the electrolyte.

[0094] In some embodiments, a plurality of recesses 103 are arranged.

[0095] The plurality of recesses 103 are arranged on the inner wall of the accommodating cavity 101 in a spaced manner, so that the plurality of recesses 103 can better increase the volume of the accommodating cavity 101, and the capacity of the accommodating cavity 101 for accommodating and buffering the electrolyte can be further improved.

[0096] In some embodiments, the first insulating member 10 is provided with two groups of liquid discharge holes 102, and the two groups of liquid discharge holes 102 are arranged oppositely.

[0097] The two groups of liquid discharge holes 102 are arranged oppositely, so that the liquid discharge holes 102 can discharge the electrolyte in the accommodating cavity 101 into the container cavity 90 from two sides of the accommodating cavity 101, the electrolyte discharged from the accommodating cavity 101 can be uniformly discharged into the container cavity 90, and the electrolyte in the container cavity 90 can better wet the electrode assembly 8.

[0098] In some embodiments, each group of liquid discharge holes 102 is provided with a plurality of liquid discharge holes 102, and the liquid discharge holes 102 in the two groups of liquid discharge holes 102 are arranged correspondingly.

[0099] The plurality of liquid discharge holes 102 in each group of liquid discharge holes 102 can improve the liquid discharge capacity of the liquid discharge holes 102 in the first insulating member 10, and reduce the possibility of electrolyte overflow during injection.

[0100] The liquid discharge holes 102 in the two groups of liquid discharge holes 102 are arranged correspondingly, which means that the two groups of liquid discharge holes 102 are provided with an equal number of liquid discharge holes 102, and the liquid discharge holes 102 in the two groups of liquid discharge holes 102 are arranged correspondingly. The liquid discharge holes 102 in the two groups of liquid discharge holes 102 are arranged correspondingly, so that the two groups of liquid discharge holes 102 have the same liquid discharge capacity, the electrolyte in the accommodating cavity 101 can be uniformly discharged to both sides from two opposite directions by the two groups of liquid discharge holes 102, and the electrolyte can uniformly wet the electrode assembly 8.

[0101] In some embodiments, the first insulating member 10 includes a main body part 104 and an accommodating part 105 connected to each other, the main body part 104 is arranged on the surface of the first wall 94 facing the container cavity 90, the accommodating part 105 protrudes towards the container cavity 90 relative to the main body part 104 and surrounds the accommodating cavity 101, and the accommodating part 105 abuts against the electrode assembly 8.

[0102] The main body part 104 and the accommodating part 105 can be two parts connected to each other in the first insulating member 10. The main body part 104 is a main structure in the first insulating member 10, which is arranged on the surface of the first wall 94 facing the container cavity 90, and is used to isolate and insulate the first wall 94 from the electrode assembly 8 and other components in the container cavity 90, so that the first wall 94 is not electrified. The accommodating part 105 can be a structure in the first insulating member 10 for surrounding the accommodating cavity 101, which protrudes towards the container cavity 90 relative to the main body part 104, and can provide space for forming the accommodating cavity 101.

[0103] The accommodating portion 105 is protruded towards the container cavity 90 relative to the main body portion 104, so that the accommodating portion 105 is more protruded than the main body portion 104, and can abut against the electrode assembly 8 to position the electrode assembly 8 in the container cavity 90, reducing the possibility of damage of the electrode assembly 8 due to shaking in the container cavity 90.

[0104] In some embodiments, the surface of the accommodating portion 105 towards the electrode assembly 8 is provided as a flat surface 1041, and the flat surface 1041 abuts against the electrode assembly 8.

[0105] By providing the surface of the accommodating portion 105 towards the electrode assembly 8 as a flat surface 1041 and abutting the flat surface 1041 against the electrode assembly 8, the surface of the accommodating portion 105 in contact with the electrode assembly 8 is a flat surface, reducing the possibility of stress concentration and damage of the part of the electrode assembly 8 in contact with the accommodating portion 105.

[0106] In some embodiments, the first insulation piece 10 further comprises an abutting portion 106 connected with the main body portion 104, the abutting portion 106 is protruded towards the container cavity 90 relative to the main body portion 104, and the abutting portion 106 abuts against the electrode assembly 8.

[0107] The abutting portion 106 can be the part of the first insulation piece 10 for abutting against the electrode assembly 8. The abutting portion 106 is protruded towards the container cavity 90 relative to the main body portion 104, which means that the abutting portion 106 is more protruded than the main body portion 104, and can abut against the electrode assembly 8 to position the electrode assembly 8 in the container cavity 90, reducing the possibility of damage of the electrode assembly 8 due to shaking in the container cavity 90.

[0108] In some embodiments, two abutting portions 106 are provided at a relative interval, and the two abutting portions 106 are symmetrically arranged on both sides of the accommodating portion 105, so that the abutting portions 106 can symmetrically apply abutting force to the electrode assembly 8, improving the stability of the electrode assembly 8 positioned in the container cavity 90.

[0109] Exemplarily, the main body portion 104, the accommodating portion 105 and the abutting portion 106 are integrally formed.

[0110] The main body portion 104, the accommodating portion 105 and the abutting portion 106 are integrally formed, which means that the main body portion 104, the accommodating portion 105 and the abutting portion 106 are integrally formed by injection molding process, not only making the first insulation piece 10 convenient to form, but also making the first insulation piece 10 have good overall structural strength.

[0111] In some embodiments, the housing 9 includes two first walls 911 disposed opposite to each other along a first direction X and two second walls 912 disposed opposite to each other along a second direction Y. The second walls 912 are connected between the two first walls 911, and the thickness direction Z, the first direction X and the second direction Y are perpendicular to each other. The distance between the two first walls 911 is set to be greater than the distance between the two second walls 912, and the drain hole 102 is disposed facing the first wall 911.

[0112] The first wall 911 and the second wall 912 are different wall structures in the housing 91. There are two first wall 911s arranged opposite each other along the first direction X, and two second wall 912s arranged opposite each other along the second direction Y. The first direction X, the second direction Y, and the thickness direction Z are perpendicular to each other. The two second wall 912s are connected between the two first wall 911s, making the battery cell 7 a prismatic battery cell 7.

[0113] By setting the distance between the two first walls 911 to be greater than the distance between the two second walls 912, the size of the battery cell 7 in the first direction X is greater than the size in the second direction Y, so that the battery cell 7 has a cuboid structure.

[0114] The drain hole 102 is oriented toward the first wall 911, which means that the drain hole 102 is oriented along the first direction X, so that the electrolyte flowing out of the drain hole 102 can better diffuse in the cavity 90 along the first direction X, so that the electrolyte flowing out of the drain hole 102 can flow along the direction where the battery cell 7 has a larger size, so that it can better adapt to the shape of the battery cell 7, and so that the electrolyte can be better filled into the cavity 90.

[0115] In some embodiments, the housing 9 is provided with a pressure relief structure 93, which is disposed opposite to the first wall 94.

[0116] The pressure relief structure 93 can be a structure for releasing internal gases from the battery cell 7. When the internal pressure or temperature of the battery cell 7 reaches a predetermined threshold, the pressure relief structure 93 activates or a weak structure within it is damaged, thereby creating an opening or channel for the release of internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 7.

[0117] As an example, the pressure relief structure 93 can be integrally formed with the outer casing 9.

[0118] As an example, the pressure relief structure 93 can also be separately configured and connected to the outer casing 9.

[0119] The term "actuation" as used in this application refers to the pressure relief structure 93 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 7. The actions of the pressure relief structure 93 may include, but are not limited to: movement of components within the pressure relief structure 93 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief structure 93, etc. When the pressure relief structure 93 is activated, the high-temperature, high-pressure substances inside the battery cell 7 are discharged outwards from the activated portion. This method allows for pressure and temperature relief of the battery cell 7 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0120] By setting the pressure relief structure 93 opposite to the first wall 94, it can be said that the pressure relief structure 93 is set on the wall structure of the shell 91 opposite to the first wall 94, so that the pressure relief structure 93 is not set on the first wall 94, reducing the space occupied by the pressure relief structure 93 on the first wall 94, and making the arrangement of components on the first wall 94 more convenient.

[0121] In some embodiments, the first wall 94 is provided with a connection hole 922 on the side facing the cavity 90, and the first insulating member 10 is provided with a connection structure 107, which is inserted into the connection hole 922.

[0122] The connection hole 922 can be a hole-like structure provided on the first wall 94 to improve the connection strength with the first insulating member 10. By opening the connection hole 922 on the side of the first wall 94 facing the cavity 90, providing the connection structure 107 on the first insulating member 10, and inserting the connection structure 107 into the connection hole 922, the connection strength between the first insulating member 10 and the first wall 94 can be improved, reducing the possibility of the first insulating member 10 falling off the first wall 94.

[0123] Some embodiments of this application also provide a battery device 2, which includes the battery cell 7 provided by the above-described technical solution.

[0124] Since the battery device 2 includes the battery cell 7 provided by the above-mentioned technical solution, the battery device 2 has a long service life.

[0125] Some embodiments of this application also provide an electrical device, which includes the battery device 2 provided by the aforementioned technical solution, the battery device 2 being used to provide electrical energy.

[0126] Some embodiments of this application provide a battery cell 7, which includes an electrode assembly 8, a housing 9, and a first insulating member 10. The housing 9 includes a shell 91 and a cover 92. The shell 91 forms a cavity 90 with a first opening 910. The electrode assembly 8 is disposed in the cavity 90. The cover 92 covers the first opening 910 and has an injection hole 921 communicating with the cavity 90. The first insulating member 10, connected to the side of the cover 92 facing the cavity 90, includes a main body portion 104 and a receiving portion 105 connected to each other. The receiving portion 105 forms a receiving cavity 101 with a second opening 1011. The receiving cavity 101 covers the injection hole 921 through the second opening 1011. The receiving portion 105 has a drain hole 102 communicating with the receiving cavity 101. The orientation of the drain hole 102 intersects the orientation of the injection hole 921. A recess 103 is provided on the inner wall of the receiving cavity 101. The drain hole 102 is provided in two sets, each set including an equal number of drain holes 102, and the two sets of drain holes 102 are arranged one-to-one on opposite sides of the receiving cavity 101.

[0127] In the above structure, since the receiving cavity 101 covers the injection hole 921 through the second opening 1011, and the orientation of the drain hole 102 intersects with the orientation of the injection hole 921, the electrolyte injected from the injection hole 921 is buffered in the receiving cavity 101, and then flows into the receiving cavity 90 from the drain hole 102 in the direction intersecting with the injection hole 921. This makes it difficult for the electrolyte injected from the injection hole 921 to directly wash over the electrode assembly 8, reducing the impact of the injected electrolyte on the electrode assembly 8, which is beneficial to extending the service life of the battery cell 7, thereby extending the service life of the battery device 2.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: an electrode assembly; a shell forming a cavity accommodating the electrode assembly, the shell comprising a first wall provided with a liquid injection hole penetrating through the thickness of the first wall; a first insulating member arranged on the side of the first wall facing the cavity, the first insulating member forming an accommodating cavity with a second opening, the accommodating cavity covering the liquid injection hole through the second opening, the first insulating member being provided with a liquid discharge hole communicating with the accommodating cavity, the liquid discharge hole being arranged opposite to the liquid injection hole in the direction of the thickness of the first wall.

2. The battery cell of claim 1, wherein, The inner wall of the accommodating cavity is provided with a recess.

3. The battery cell of claim 2, wherein, The recess is arranged opposite to the liquid injection hole in the direction of the thickness of the first wall.

4. The battery cell of claim 2, wherein, The recess is provided with a plurality of recesses arranged at intervals.

5. The battery cell of claim 1, wherein, The liquid discharge hole is provided with two groups of liquid discharge holes arranged opposite to each other.

6. The battery cell of claim 5, wherein, Each group of liquid discharge holes is provided with a plurality of liquid discharge holes, and the liquid discharge holes in the two groups of liquid discharge holes are arranged opposite to each other.

7. The battery cell of claim 1, wherein, The first insulating member comprises a main body portion and an accommodating portion connected to each other, the main body portion is arranged on the surface of the first wall facing the cavity, the accommodating portion protrudes towards the cavity relative to the main body portion and encloses the accommodating cavity, and the accommodating portion abuts against the electrode assembly.

8. The battery cell of claim 7, wherein, The surface of the accommodating portion facing the electrode assembly is arranged as a plane, and the plane abuts against the electrode assembly.

9. The battery cell of claim 7, wherein, The first insulating member further comprises an abutting portion connected to the main body portion, the abutting portion protrudes towards the cavity relative to the main body portion, and the abutting portion abuts against the electrode assembly.

10. The battery cell of claim 1, wherein, The shell comprises two first wall bodies arranged opposite to each other in a first direction and two second wall bodies arranged opposite to each other in a second direction, the second wall bodies are connected between the two first wall bodies, the thickness direction, the first direction and the second direction are perpendicular to each other, the distance between the two first wall bodies is greater than the distance between the two second wall bodies, and the liquid discharge hole is arranged towards the first wall body.

11. The battery cell of claim 1, wherein, The shell is provided with a pressure relief structure arranged opposite to the first wall.

12. The battery cell of claim 1, wherein, The side of the first wall facing the cavity is provided with a connecting hole, and the first insulating member is provided with a connecting structure inserted into the connecting hole.

13. A battery device characterized by comprising: The battery device comprises the battery cell as claimed in any one of claims 1 to 12.

14. An electrical device, comprising: The battery device as claimed in claim 13 is used for providing electric energy.

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