Battery cell, battery device, and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and the battery monomer comprises a shell which comprises a first wall, and the first wall is provided with a through hole; the electrode assembly is arranged in the shell; the insulating part covers at least part of the electrode assembly; the blocking piece is arranged in the shell, at least part of the blocking piece is located between the first wall and the electrode assembly, and the orthographic projection of the blocking piece on the first wall covers at least part of the through hole. According to the battery monomer, the battery device and the power utilization device provided by the embodiment of the invention, the reliability of the battery monomer can be improved.

Description

TECHNICAL FIELD

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

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the related art, the electrode assembly of the battery monomer is prone to wrinkling when performing the bumping process, which affects the reliability of the battery monomer. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power utilization device, which can improve the reliability of the battery monomer

[0005] In the first aspect, the present application provides a battery monomer, comprising a shell, an electrode assembly, an insulating piece and a blocking piece. The shell comprises a first wall, and the first wall is provided with a through hole. The electrode assembly is arranged in the shell. The insulating piece covers part of the electrode assembly. The blocking piece is arranged in the shell, and the blocking piece is located between the first wall and the electrode assembly. The orthogonal projection of the blocking piece on the first wall covers at least part of the through hole.

[0006] The battery monomer provided by an embodiment of the present application can inject electrolyte into the interior of the battery monomer through the through hole on the first wall. When bumping is needed for the battery monomer, bumping gas can also be injected into the battery monomer through the through hole. By adding a blocking piece in the battery monomer and making the blocking piece at least partially located between the first wall and the electrode assembly, the orthogonal projection of the blocking piece on the first wall covers at least part of the through hole. This can ensure that the bumping gas is blocked by the blocking piece when entering, so that the flow direction of the bumping gas can be changed, the electrode assembly can be reduced by the bumping gas blowing from the front along the axis of the through hole, and the risk of separation of the electrode assembly and the diaphragm can be reduced, thereby improving the reliability of the battery monomer.

[0007] In some embodiments, the blocking piece is connected to the insulating piece.

[0008] By connecting the blocking piece to the insulating piece, the position of the blocking piece relative to the electrode assembly and the through hole in the battery monomer can be fixed, which is conducive to changing the flow direction of the bumping gas and reducing the electrode assembly being blown from the front along the axis of the through hole by the bumping gas.

[0009] In some embodiments, the blocking piece and the insulating piece are in an integral structure.

[0010] By making the blocking piece and the insulating piece into an integral structure, the position of the blocking piece relative to the electrode assembly and the through hole inside the battery monomer can be fixed, the connection strength between the blocking piece and the insulating piece can be ensured, and the forming difficulty of the blocking piece and the insulating piece can be reduced.

[0011] In some embodiments, the blocking piece and the insulating piece are adhesively connected to each other.

[0012] By adhesively connecting the blocking piece and the insulating piece to each other, the connection position between the blocking piece and the insulating piece can be set according to the position of the through hole, and the flexibility of the setting position of the blocking piece can be ensured.

[0013] In some embodiments, the insulating piece includes a bottom wall and a side wall, the side wall is arranged around the bottom wall, the bottom wall and the side wall enclose a cavity with an opening, the electrode assembly is arranged in the cavity, and the blocking piece is connected to the side wall and covers at least part of the opening.

[0014] The insulating piece adopts the above structure, which can isolate the electrode assembly from the shell, prevent the electrode assembly from being in contact with the shell and short-circuited, and ensure the reliability of the battery monomer. The blocking piece is connected to the side wall, which can reduce the size of the blocking piece, reduce the cost and the occupied area of the blocking piece inside the shell, and ensure the energy density requirement of the battery monomer.

[0015] In some embodiments, the side wall includes a first wall surface and a second wall surface arranged opposite to each other, the area of the first wall surface is larger than that of the second wall surface, and the blocking piece is connected to the first wall surface.

[0016] By connecting the blocking piece to the first wall surface, the blocking piece and the insulating piece can be connected nearby, and the occupied space of the blocking piece inside the shell can be reduced.

[0017] In some embodiments, the blocking piece includes an insulating sheet, and the insulating sheet and one of the first wall surfaces are in an integral structure.

[0018] Through the above arrangement, the structure of the blocking piece can be simplified, the change of the direction of the gas flow can be ensured, and the form of the insulating sheet will not affect the electrical performance of the electrode assembly.

[0019] In some embodiments, the number of the blocking pieces is multiple, at least two blocking pieces are arranged in an overlapping manner and form an overlapping area, and the orthogonal projection of the overlapping area on the first wall surface covers at least part of the through hole.

[0020] By arranging at least two blocking pieces in an overlapping manner and forming an overlapping area, the orthogonal projection of the overlapping area on the first wall surface covers the through hole, and the blocking effect on the gas flow can be enhanced.

[0021] In some embodiments, the blocking piece is connected to the electrode assembly.

[0022] By connecting the blocking piece to the electrode assembly, the position of the blocking piece relative to the electrode assembly and the through hole in the battery monomer can also be fixed, the flow direction of the gas generated by the convex can be changed, and the electrode assembly can be reduced by the axial front blowing of the gas generated by the convex along the through hole

[0023] In some embodiments, the area of the blocking piece is greater than the area of the through hole, the blocking piece is spaced apart from the first wall, and the orthogonal projection of the blocking piece on the first wall completely covers the through hole.

[0024] By making the orthogonal projection of the blocking piece on the first wall completely cover the through hole, the electrode assembly can be effectively prevented from being swept by the gas generated by the convex along the axial direction of the through hole. Moreover, the blocking piece is spaced apart from the first wall, which helps to ensure the resistance of the electrolyte and the gas generated by the convex when entering the inside of the shell, so that they can smoothly enter the inside of the shell.

[0025] In some embodiments, the insulating piece is provided with a first infiltration hole, and the insulating piece has a gap between the shell, and the first infiltration hole communicates with the gap and the cavity.

[0026] Through the above arrangement, the electrode assembly can be repeatedly contacted with the electrolyte, and the electrical performance of the battery monomer can be optimized.

[0027] In some embodiments, the battery monomer further comprises a supporting plate supported between the insulating piece and the shell.

[0028] By providing the supporting plate, the electrode assembly can be stably fixed in the shell, preventing the electrode assembly from shaking in the shell and avoiding problems such as internal structure damage caused by shaking.

[0029] In some embodiments, the supporting plate is provided with a second infiltration hole, and the second infiltration hole is in communication with at least part of the first infiltration hole.

[0030] In a second aspect, the application provides a battery comprising the above-mentioned battery monomer.

[0031] In a third aspect, the application provides a power device comprising the above-mentioned battery device.

[0032] The above description is only a summary of the technical solutions of the application. In order to more clearly understand the technical means of the application, the application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0033] 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 with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to be limiting in any respect. Furthermore, the purpose of the drawings is to illustrate preferred embodiments of the application and not all features of the embodiments are necessary to achieve the advantages of the application. In the drawings:

[0034] Figure 1 is a structural schematic diagram of a vehicle according to an embodiment of the application;

[0035] Figure 2 is a structural schematic diagram of a battery device according to an embodiment of the application;

[0036] Figure 3 is an exploded schematic diagram of a battery cell according to an embodiment of the application;

[0037] Figure 4 is a schematic diagram of the insulation member and the blocking member according to an embodiment of the application;

[0038] Figure 5 is a schematic diagram of the insulation member and the blocking member according to an embodiment of the application;

[0039] Figure 6 is a schematic diagram of the insulation member and the blocking member according to another embodiment of the application;

[0040] Figure 7 is a schematic diagram of the insulation member and the blocking member according to an embodiment of the application;

[0041] Figure 8 is an exploded schematic diagram of a battery cell according to an embodiment of the application;

[0042] Figure 9 is a structural schematic diagram of the insulation member and the pallet according to an embodiment of the application.

[0043] Legend:

[0044] 1, vehicle; 100, battery device; 200, battery module; 300, controller; 400, motor;

[0045] 10, case; 11, first case portion; 12, second case portion;

[0046] 20, battery cell; 20a, outer shell; 201, first wall; 202, through hole;

[0047] 21, housing;

[0048] 22, electrode assembly;

[0049] 23, cover plate; 231, electrode terminal;

[0050] 24, insulating piece; 241, bottom wall; 242, side wall; 2421, first wall surface; 2422, second wall surface; 243, first infiltration hole;

[0051] 24a, cavity; 24b, opening;

[0052] 25, blocking piece; 251, overlapping area;

[0053] 26, supporting plate; 261, second infiltration hole;

[0054] X, axial direction. DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] 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 direction X", "radial direction", "circumferential direction" 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.

[0058] 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.

[0059] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be 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.

[0060] 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. The first and second features can be in direct contact, or the first and second features can be indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0061] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields.

[0062] With the continuous expansion of the application field of power battery, the market demand is also increasing. The requirement for high energy density is higher and higher, and it is inevitable to introduce longer and higher battery monomer. The battery monomer in the related technology has reliability problem. Research shows that the battery monomer is deformed and concave under the suction or clamp pressure during negative pressure formation or clamp formation. This concave will cause insufficient residual space during liquid injection, resulting in overflow problem, which will affect the electrochemical performance of the battery monomer, the service life of the process equipment, the substantial attenuation of the process capacity, the corrosion of the shell and a series of problems.

[0063] In order to improve the concave of the battery monomer, the positive convex process can be used, that is, the gas with a predetermined pressure is injected into the inside of the battery monomer, and the concave is repaired by external force. However, when the battery monomer is convex, the risk of separation of the pole piece and the diaphragm of the electrode assembly will cause the pole piece to wrinkle. Since the serious wrinkles in the pole piece cannot completely exclude the gas, bubble-shaped black spots will occur, which will affect the capacity of the battery monomer. In addition, there is a large interlayer gap between the wrinkled pole piece and the diaphragm after convex, which cannot form ion path during charging and discharging, causing ion bridge breakage. After a long time of circulation or storage, serious lithium precipitation will occur, which will further affect the reliability of the battery monomer.

[0064] To this end, one embodiment of the present application provides a battery monomer, comprising a shell, an electrode assembly, an insulating piece and a blocking piece. The shell comprises a first wall, and the first wall is provided with a through hole. The electrode assembly is arranged in the shell. The insulating piece covers part of the electrode assembly. The blocking piece is arranged in the shell, and the blocking piece is at least partially located between the first wall and the electrode assembly. The orthogonal projection of the blocking piece on the first wall covers at least part of the through hole. By adding the blocking piece in the battery monomer, and making the blocking piece at least partially located between the first wall and the electrode assembly, and the orthogonal projection of the blocking piece on the first wall covering at least part of the through hole, the blocking piece can block the bulging gas when it enters, so that the bulging gas can change the flow direction, reduce the risk of the electrode assembly being swept by the bulging gas along the axial direction of the through hole, and further reduce the risk of the electrode assembly being separated from the diaphragm, thereby improving the reliability of the battery monomer.

[0065] The technical solutions described in the embodiments of the present application are suitable for use in an electric device or an energy storage device using a battery device.

[0066] The electric 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. The embodiments of the present application do not specially limit the above electric devices.

[0067] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above described electric devices, but also can be applied to all battery devices including a box body and electric devices, energy storage devices using the battery devices. For the sake of simplicity of description, the following embodiments take an electric vehicle as an example for description.

[0068] For example, as shown in FIG. 1, the battery device 100 includes a box body 110, a plurality of battery monomers 120 and a plurality of bus bars 130. The box body 110 includes a box body shell 111 and a plurality of box body insulating pieces 112. The plurality of battery monomers 120 are arranged in the box body 110. The plurality of bus bars 130 are arranged in the box body 110. Figure 1As shown, the vehicle 1 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 automobile, or a range extended automobile, etc. The vehicle 1 can be provided with a motor 400, a controller 300, and a battery device 100, and the controller 300 is used to control the battery device 100 to supply power to the motor 400. For example, the battery device 100 can be arranged at the bottom, the front, or the rear of the vehicle 1. The battery device 100 can be used to supply power to the vehicle 1, for example, the battery device 100 can be used as an operating power source of the vehicle 1, and is used for the circuit system of the vehicle 1, for example, for the power demand of starting, navigation, and working of the vehicle 1. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0069] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-mentioned vehicle 1, but also applicable to energy storage devices.

[0070] As shown, Figure 2 In order to meet different power demand, the battery device 100 includes a box body 10 and a plurality of battery cells 20, and the box body 10 has a containing cavity, and the plurality of battery cells 20 are arranged in the containing cavity.

[0071] The box body 10 can be a simple solid structure such as a cuboid, a cylinder, or a sphere, or can be a complex solid structure composed of a cuboid, a cylinder, or a sphere, and the embodiments of the present application are not limited thereto. The material of the box body 10 can be an alloy material such as aluminum alloy or iron alloy, a high polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, and the embodiments of the present application are not limited thereto.

[0072] The box body 10 is used to contain the battery cells 20, and the box body 10 can have various structures. In some embodiments, the box body 10 can include a first box body part 11 and a second box body part 12, the first box body part 11 and the second box body part 12 are overlapped with each other, and the first box body part 11 and the second box body part 12 jointly define a containing cavity for containing the battery cells 20. The second box body part 12 can be a hollow structure with one end open, and the first box body part 11 is a plate structure, and the first box body part 11 is overlapped with the open side of the second box body part 12 to form the box body 10 with the containing cavity; or the first box body part 11 and the second box body part 12 can both be a hollow structure with one side open, and the open side of the first box body part 11 is overlapped with the open side of the second box body part 12 to form the box body 10 with the containing cavity. Of course, the first box body part 11 and the second box body part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0073] To improve the sealing performance after the first housing part 11 and the second housing part 12 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 11 and the second housing part 12.

[0074] Assuming that the first box part 11 covers the top of the second box part 12, the first box part 11 can also be called the upper box cover, and the second box part 12 can also be called the lower box 10.

[0075] In the battery device 100, there can be multiple battery cells 20. If there are multiple battery cells 20, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 20 can be housed in the housing 10. Alternatively, multiple battery cells 20 can first be connected in series, in parallel, or in a mixed manner to form a battery module 200, and then multiple battery modules 200 can be connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 10.

[0076] Multiple battery cells 20 in the battery module 200 can be electrically connected through adapter plates to achieve parallel, series, or mixed connection of multiple battery cells 20 in the battery module 200.

[0077] In this embodiment of the application, the battery cell 20 can be a secondary battery, which refers to a battery cell 20 that can be used again after being discharged by recharging to activate the active materials.

[0078] The battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0079] like Figures 3 to 5 As shown, a battery cell 20 provided in one embodiment of this application includes a housing 20a, an electrode assembly 22, an insulating member 24, and a blocking member 25. The housing 20a includes a first wall 201, on which a through hole 202 is provided. The electrode assembly 22 is disposed within the housing 20a. The insulating member 24 covers a portion of the electrode assembly 22. The blocking member 25 is disposed within the housing 20a, located between the first wall 201 and the electrode assembly 22, and its orthographic projection on the first wall 201 covers at least a portion of the through hole 202.

[0080] The shell 20a included in the battery cell 20 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell 20a), or an aluminum-plastic film, etc. In some embodiments, the shell 20a serves to protect the electrode assembly 22, and a sealing bag is further included between the shell 20a and the electrode assembly 22, for encapsulating the electrode assembly 22 and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member 24 or an aluminum-plastic film. When the shell 20a is a sealed structure, it is used to encapsulate components such as the electrode assembly 22 and electrolyte.

[0081] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, including a square battery cell, a blade-shaped battery cell 20, a multi-prismatic battery cell (such as a hexagonal battery cell), etc., without specific limitation in the present application.

[0082] The shell 20a of the battery cell 20 can include a shell body 21 having a cavity and an opening communicating with the cavity, and a cover plate 23 which can be arranged at the opening of the shell body 21 and connected with the shell body 21. The shell body 21 or the cover plate 23 includes a first wall 201. Optionally, the cover plate 23 includes the first wall 201.

[0083] The electrode assembly 22 includes a positive electrode, a negative electrode, and a separator arranged between the negative electrode and the positive electrode. During charging and discharging of the battery cell 20, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator arranged between the positive electrode and the negative electrode can prevent short circuiting of the positive and negative electrodes, while allowing the active ions to pass through.

[0084] The electrode assembly 22 can be in a jelly-roll structure, a stacked structure, or a hybrid structure of jelly-roll and stacking.

[0085] In some embodiments, the electrode assembly 22 is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into a jelly-roll structure.

[0086] In some embodiments, the electrode assembly 22 is in a stacked structure.

[0087] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be arranged alternately and stacked.

[0088] As an example, a plurality of positive electrode sheets can be arranged, and the negative electrode sheet is folded to form a plurality of folded segments arranged in layers, with one positive electrode sheet clamped between adjacent folded segments.

[0089] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments arranged in layers.

[0090] As an example, the isolation pieces can be provided in plurality, and are respectively provided between any adjacent positive electrode tab or negative electrode tab.

[0091] As an example, the isolation pieces can be provided in plurality, and are respectively provided between any adjacent positive electrode tab or negative electrode tab.

[0092] In some embodiments, the electrode assembly 22 can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0093] In some embodiments, the electrode assembly 22 is provided with a tab, which can guide current out of the electrode assembly 22. The tab includes a positive tab and a negative tab.

[0094] The insulation piece 24 can be wrapped on the outer side of the electrode assembly 22, and is mainly used to isolate the electrode assembly 22 from the shell 21, to prevent the electrode assembly 22 from being in contact with the shell 21 and causing short circuit, and to ensure the reliability of the battery monomer 20. The insulation piece 24 can also prevent the electrode assembly 22 from being scratched, and avoid the shell 21 from scratching the surface of the electrode assembly 22 during assembly or use.

[0095] The insulation piece 24 can wrap multiple surfaces of the electrode assembly 22, and the insulation piece 24 can be an integral structure or can be formed in a split bonding manner, and can be selected to have an integral structure.

[0096] The blocking piece 25 can be an insulator, and the blocking piece 25 is at least partially disposed on the side of the electrode assembly 22 facing the through hole 202. The blocking piece 25 can have a sheet structure or a film layer structure, etc.

[0097] The orthographic projection of the blocking piece 25 on the first wall 201 can cover part of the through hole 202, and of course can also cover the entire through hole 202.

[0098] The blocking piece 25 can be connected to at least one of the electrode assembly 22 and the insulation piece 24.

[0099] The battery monomer 20 provided by an embodiment of the present application can inject electrolyte into the inside of the battery monomer 20 through the through hole 202 provided on the first wall 201, and can also inject bumping gas into the inside of the battery monomer 20 through the through hole 202 when the battery monomer 20 needs to be bumped. By adding the blocking piece 25 in the battery monomer 20, and making the blocking piece 25 at least partially located between the first wall 201 and the electrode assembly 22, and making the orthographic projection of the blocking piece 25 on the first wall 201 cover at least part of the through hole 202, the bumping gas can be blocked by the blocking piece 25 when entering, so that the bumping gas can change the flow direction, reduce the risk of the electrode assembly 22 being separated from the diaphragm by the bumping gas blowing along the axial direction X of the through hole 202, and improve the reliability of the battery monomer 20.

[0100] In some embodiments, the blocking member 25 is connected to the insulating member 24.

[0101] The blocking member 25 can be connected to one end of the electrode assembly 22 in the thickness direction. Alternatively, the blocking member 25 can be connected to the insulating member 24 at both ends in the thickness direction.

[0102] In one embodiment of this application, the battery cell 20 is provided. By connecting the blocking member 25 to the insulating member 24, the position of the blocking member 25 relative to the electrode assembly 22 and the through hole 202 within the battery cell 20 is fixed. This facilitates changing the flow direction of the protrusion-generating gas and reducing the axial X-shaped frontal blow of the protrusion-generating gas along the through hole 202 onto the electrode assembly 22.

[0103] In some alternative embodiments, the blocking member 25 and the insulating member 24 are integrally formed.

[0104] The blocking member 25 and the insulating member 24 can be integrally formed. The blocking member 25 can be partially bent relative to the insulating member 24 so that its orthographic projection on the first wall 201 covers at least a portion of the through hole 202.

[0105] By making the blocking member 25 and the insulating member 24 an integral structure, it is possible to ensure that the position of the blocking member 25 relative to the electrode assembly 22 and the through hole 202 inside the battery cell 20 is fixed, and it is also beneficial to ensure the connection strength between the blocking member 25 and the insulating member 24. At the same time, it can reduce the molding difficulty of the blocking member 25 and the insulating member 24.

[0106] It is understood that the use of an integral structure between the blocking member 25 and the insulating member 24 is only an optional implementation method. In some embodiments, the blocking member 25 and the insulating member 24 can also be bonded to each other.

[0107] Connecting adhesive can be applied at the connection point between the blocking member 25 and the insulating member 24 to allow them to connect and maintain a fixed relative position.

[0108] By bonding the blocking member 25 and the insulating member 24 together, the connection position between the blocking member 25 and the insulating member 24 can be set according to the position of the through hole 202, ensuring the flexibility of the blocking member 25 setting position.

[0109] like Figures 3 to 5 As shown, in some embodiments, the insulating member 24 includes a bottom wall 241 and a side wall 242. The side wall 242 is disposed around the bottom wall 241. The bottom wall 241 and the side wall 242 enclose a cavity 24a with an opening 24b. The electrode assembly 22 is disposed in the cavity 24a. The blocking member 25 is connected to the side wall 242 and covers at least part of the opening 24b.

[0110] The bottom wall 241 and the side wall 242 can be intersected, or optionally, the bottom wall 241 and the side wall 242 can be perpendicular.

[0111] The shape of the cavity 24a may match at least a portion of the shape of the electrode assembly 22. The electrode assembly 22 may be at least partially located within the cavity 24a. Optionally, the bottom surface of the electrode assembly 22 may be fitted to the bottom wall 241, and the side surface of the electrode assembly 22 may be fitted to the side wall 242.

[0112] The insulating component 24 and the electrode assembly 22 can be connected and fixed by adhesive bonding or by heat pressing or other methods.

[0113] The blocking member 25 can be connected to the side wall 242 and bent relative to the side wall 242.

[0114] Optionally, the insulating element 24 and the bottom wall 241 can be arranged opposite each other along the axial direction X of the through hole 202.

[0115] In one embodiment of this application, the battery cell 20 has an insulating member 24 with the above-described structure. This structure effectively isolates the electrode assembly 22 from the housing 21, preventing short circuits between the electrode assembly 22 and the housing 21 and ensuring the reliability of the battery cell 20. Furthermore, connecting the blocking member 25 to the side wall 242 reduces the size of the blocking member 25, lowers costs, and reduces the area occupied by the blocking member 25 inside the housing 20a, thus ensuring the energy density requirements of the battery cell 20.

[0116] In some embodiments, the sidewall 242 includes a first wall surface 2421 and a second wall surface 2422 disposed opposite to each other, the area of ​​the first wall surface 2421 being larger than that of the second wall surface 2422, and the blocking member 25 being connected to the first wall surface 2421.

[0117] Optionally, the first wall surface 2421 and the second wall surface 2422 can be alternately arranged in the direction surrounding the bottom wall 241.

[0118] The first wall surface 2421 and the second wall surface 2422 can both be square. The first wall surface 2421 is used to isolate the large surface of the electrode assembly 22 from the housing 21, and the second wall surface 2422 is used to isolate the side surface of the electrode assembly 22 from the housing 21.

[0119] By connecting the blocking member 25 to the first wall surface 2421, it is beneficial to facilitate the close connection between the blocking member 25 and the insulating member 24, thereby reducing the space occupied by the blocking member 25 inside the housing 20a.

[0120] In some embodiments, the blocking member 25 includes an insulating sheet that is integrally formed with one of the first wall surfaces 2421.

[0121] The insulation piece 24 can be formed by folding and connecting a sheet or a film layer along the folding line. The barrier piece 25 includes an insulation sheet, which can be integrally formed with the insulation piece 24 and connected to the first wall surface 2421 of the insulation sheet. The barrier piece 25 is opposite to the through hole 202 by means of folding.

[0122] By means of the above arrangement, the structure of the barrier piece 25 can be simplified, and the change of the direction of the gas flow can be ensured. The form of the insulation sheet does not affect the electrical performance of the electrode assembly 22.

[0123] As shown in FIGS. 1, 2 and 3, in some alternative embodiments, the number of the barrier pieces 25 is plural, and at least two of the barrier pieces 25 are arranged to overlap and form an overlapping area 251. The orthogonal projection of the overlapping area 251 on the first wall 201 covers the through hole 202. Figure 6 , Figure 7 The number of the barrier pieces 25 can be two, three or more.

[0124] The plurality of barrier pieces 25 can be arranged to partially overlap and partially stagger with each other. Of course, the plurality of barrier pieces 25 can also be arranged to completely overlap.

[0125] When the insulation piece 24 includes the first wall surface 2421 and the second wall surface 2422, a part of the plurality of barrier pieces 25 can be connected to the first wall surface 2421, and a part of the plurality of barrier pieces 25 can be connected to the second wall surface 2422. Of course, each of the barrier pieces 25 can be connected to the first wall surface 2421. For example, the barrier pieces 25 can be connected to the two oppositely arranged first wall surfaces 2421, and the barrier pieces 25 on the two sides can be arranged to overlap.

[0126] The battery monomer 20 provided by one embodiment of the present application can enhance the blocking effect of the barrier piece 25 on the gas by arranging at least two of the barrier pieces 25 to overlap and form the overlapping area 251, and the orthogonal projection of the overlapping area 251 on the first wall 201 covers the through hole 202.

[0127] It can be understood that the connection of the barrier piece 25 to the insulation piece 24 is an alternative implementation. In some embodiments, the barrier piece 25 can be connected to the electrode assembly 22.

[0128] The barrier piece 25 and the electrode assembly 22 can be connected by means of adhesive connection, pressure connection, etc. The barrier piece 25 and the diaphragm of the electrode assembly 22 can also be integrated into an integral structure.

[0129] The barrier piece 25 and the electrode assembly 22 can be connected by means of adhesive connection, pressure connection, etc. The barrier piece 25 and the diaphragm of the electrode assembly 22 can also be integrated into an integral structure.

[0130] The battery cell 20 provided by one embodiment of the present application can also facilitate the fixation of the blocking piece 25 in the battery cell 20 relative to the electrode assembly 22 and the through hole 202, facilitate the change of the flow direction of the outgassing gas, and reduce the direct blowing of the outgassing gas along the axial direction X of the through hole 202 to the electrode assembly 22 by connecting the blocking piece 25 to the electrode assembly 22.

[0131] In some embodiments, the area of the blocking piece 25 is greater than the area of the through hole 202, and the blocking piece 25 is arranged in a spaced manner with the first wall 201, and the orthogonal projection of the blocking piece 25 on the first wall 201 completely covers the through hole 202.

[0132] By making the orthogonal projection of the blocking piece 25 on the first wall 201 completely cover the through hole 202, the direct blowing of the outgassing gas along the axial direction X of the through hole 202 to the electrode assembly 22 can be effectively avoided. Moreover, the blocking piece 25 is arranged in a spaced manner with the first wall 201, which facilitates the guarantee of the resistance of the electrolyte and the outgassing gas when entering the inside of the shell 20a, so that they can smoothly enter the inside of the shell 20a.

[0133] As shown in FIG. 1, Figure 8 In some embodiments, the insulating piece 24 is provided with a first infiltration hole 243, and the insulating piece 24 has a gap with the shell 20a, and the first infiltration hole 243 communicates the gap and the cavity 24a.

[0134] The number of the first infiltration holes 243 is multiple, and the multiple first infiltration holes 243 can be arranged on the bottom wall 241 and / or the side wall 242 of the insulating piece 24.

[0135] Through the above arrangement, the electrode assembly 22 can be facilitated to be in full contact with the electrolyte, and the electrical performance of the battery cell 20 can be optimized.

[0136] As shown in FIG. 1, Figure 9 In some embodiments, the battery cell 20 further comprises a supporting plate 26, and the supporting plate 26 is supported between the insulating piece 24 and the shell 20a.

[0137] In the axial direction X of the through hole 202, the supporting plate 26 can be arranged between the bottom wall 241 and the insulating piece 24.

[0138] By arranging the supporting plate 26, the electrode assembly 22 can be stably fixed in the shell 20a, and the electrode assembly 22 can be prevented from shaking in the shell 20a, and problems such as internal structure damage caused by shaking can be avoided.

[0139] In some embodiments, the supporting plate 26 is provided with a second infiltration hole 261, and the second infiltration hole 261 is arranged in communication with at least part of the first infiltration holes 243.

[0140] The second infiltration hole 261 can be a plurality of through holes 202 arranged on the support plate 26.

[0141] The second infiltration hole 261 can be a plurality of through holes 202 arranged on the support plate 26.

[0142] By arranging the second infiltration hole 261 on the support plate 26 and making it communicate with the first infiltration hole 243, sufficient contact between the electrode assembly 22 and the electrolyte is facilitated.

[0143] In an embodiment, the battery monomer 20 includes a shell 20a, an electrode assembly 22, an insulating piece 24, a blocking piece 25, and a support plate 26. The shell 20a is in the shape of a square box as a whole. The shell 20a includes a shell body 21 and a cover plate 23. The shell body 21 has a cavity and an opening communicating with the cavity. The cover plate 23 can be arranged at the opening of the shell body 21 and connected with the shell body 21. The cover plate 23 includes a first wall 201, and an electrode terminal 231 is arranged on the cover plate 23. The electrode assembly 22 is arranged in the shell 20a. The electrode assembly 22 can have a winding form. The winding axial direction X of the electrode assembly 22 can be arranged in the same direction as the axial direction X of the through hole 202. The insulating piece 24 surrounds the electrode assembly 22. The insulating piece 24 includes a bottom wall 241 and a side wall 242. The side wall 242 surrounds the bottom wall 241. The bottom wall 241 and the side wall 242 enclose a cavity 24a having an opening 24b. The electrode assembly 22 is arranged in the cavity 24a. The blocking piece 25 is connected to the side wall 242 and covers at least part of the opening 24b. The side wall 242 includes a first wall surface 2421 and a second wall surface 2422 arranged oppositely. The area of the first wall surface 2421 is greater than that of the second wall surface 2422. The blocking piece 25 is connected to the first wall surface 2421. The blocking piece 25 includes an insulating sheet in an integral structure with one of the first wall surfaces 2421. The area of the blocking piece 25 is greater than that of the through hole 202. The blocking piece 25 and the first wall 201 are arranged at a distance from each other. The orthogonal projection of the blocking piece 25 on the first wall 201 completely covers the through hole 202. The insulating piece 24 is provided with a first infiltration hole 243. There is a gap between the insulating piece 24 and the shell 20a. The first infiltration hole 243 communicates with the gap and the cavity 24a. The support plate 26 is supported between the insulating piece 24 and the shell 20a. The support plate 26 is provided with a second infiltration hole 261. The second infiltration hole 261 communicates with at least part of the first infiltration hole 243.

[0144] In a second aspect, the application provides a battery device including the battery monomer 20 provided in any of the embodiments.

[0145] In a third aspect, the application provides a power consumption device including the battery device provided in any of the embodiments.

[0146] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present 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 in that, include: The outer casing includes a first wall, on which a through hole is provided; Electrode assembly, disposed within the housing; An insulating component is provided to cover part of the electrode assembly; A blocking element is disposed within the housing, the blocking element being located between the first wall and the electrode assembly, the orthographic projection of the blocking element on the first wall covering at least a portion of the through hole.

2. The battery cell according to claim 1, characterized in that, The blocking element is connected to the insulating element.

3. The battery cell according to claim 1 or 2, characterized in that, The blocking component and the insulating component are an integral structure; Alternatively, the blocking element and the insulating element are bonded together.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The insulating member includes a bottom wall and a side wall, the side wall being disposed around the bottom wall, the bottom wall and the side wall forming a cavity with an opening, the electrode assembly being disposed in the cavity, and the blocking member being connected to the side wall and covering at least a portion of the opening.

5. The battery cell according to claim 4, characterized in that, The sidewall includes a first wall surface and a second wall surface that are disposed opposite to each other. The area of ​​the first wall surface is larger than that of the second wall surface, and the blocking member is connected to the first wall surface.

6. The battery cell according to claim 5, characterized in that, The blocking element includes an insulating sheet, which is integrally formed with one of the first wall surfaces.

7. The battery cell according to any one of claims 4 to 6, characterized in that, The number of the blocking elements is multiple, and at least two of the blocking elements are overlapped to form an overlapping area. The orthographic projection of the overlapping area on the first wall covers at least a portion of the through hole.

8. The battery cell according to any one of claims 1 to 7, characterized in that, The blocking element is connected to the electrode assembly.

9. The battery cell according to any one of claims 1 to 8, characterized in that, The area of ​​the blocking member is larger than the area of ​​the through hole. The blocking member and the first wall are spaced apart from each other. The orthographic projection of the blocking member on the first wall completely covers the through hole.

10. The battery cell according to any one of claims 1 to 9, characterized in that, The insulating component is provided with a first wetting hole, and there is a gap between the insulating component and the outer shell. The first wetting hole connects the gap and the cavity.

11. The battery cell according to claim 10, characterized in that, The battery cell also includes a support plate, which is supported between the insulating component and the outer casing.

12. The battery cell according to claim 11, characterized in that, The tray is provided with a second wetting hole, which is connected to at least a portion of the first wetting hole.

13. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 12.

14. An electrical appliance, characterized in that, Includes the battery device as described in claim 13.

Images