Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and an electric equipment. The battery monomer comprises: a shell comprising a first wall, wherein a through hole is arranged on the first wall; an insulating piece arranged in the shell, wherein the insulating piece has a containing cavity and an opening in communication with the containing cavity, and the opening is arranged towards the first wall; an electrode assembly arranged in the containing cavity; and a first flow guide piece between the first wall and the electrode assembly, wherein the first flow guide piece covers the through hole in the orthographic projection on the first wall, and the first flow guide piece is arranged across the opening and connected to the insulating piece. The battery monomer, the battery device and the electric equipment provided by the application can improve the reliability of the battery monomer.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to a battery monomer, a battery device and an electric equipment. 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] The battery monomer in the related art has the phenomenon of lithium precipitation of the pole piece, which affects the reliability of the battery monomer. SUMMARY

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and an electric equipment, which can improve the reliability of the battery monomer.

[0005] In a first aspect, the present application provides a battery monomer, comprising: a shell, an insulating piece, an electrode assembly and a first flow guide piece, the shell comprising a first wall, the first wall being provided with a through hole. The insulating piece is arranged in the shell, the insulating piece having a receiving cavity and an opening communicating with the receiving cavity, the opening being arranged towards the first wall. The electrode assembly is arranged in the receiving cavity, the first flow guide piece being located between the first wall and the electrode assembly, the first flow guide piece covering the through hole in the orthographic projection on the first wall, the first flow guide piece being arranged across the opening and connected to the insulating piece.

[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 provided on the first wall. The first flow guide piece is arranged and located between the first wall and the electrode assembly, the first flow guide piece covering the through hole in the orthographic projection on the first wall, the first flow guide piece being arranged across the opening and connected to the insulating piece, so that the electrolyte and other fluids entering through the through hole can be guided to the outside of the insulating piece away from the receiving cavity by the first flow guide piece, and under the action of gravity, flow along the outer wall surface of the insulating piece to the end of the shell opposite to the first wall. The electrolyte can climb under the capillary action, gradually soak from bottom to top as the electrolyte accumulates, avoiding the liquid sealing phenomenon when the electrolyte soaks from the periphery to the middle area, so that the pole pieces of the electrode assembly are uniformly soaked, the black spots of the battery pole pieces are improved, and the lithium precipitation phenomenon in the use process of the battery monomer is avoided, thereby improving the reliability of the battery monomer.

[0007] In some embodiments, the insulating piece comprises a bottom wall and a side wall, the side wall being arranged around the bottom wall and enclosing the receiving cavity, the bottom wall being arranged opposite to the opening, the first flow guide piece being connected to the side wall, and at least one of the bottom wall and the side wall being provided with a channel.

[0008] The insulation piece adopts the above structure, which can isolate the electrode assembly from the shell, prevent the electrode assembly from short circuiting with the shell, and ensure the reliability of the battery monomer. The first flow guide piece is connected to the side wall, which can ensure the relative position of the first flow guide piece and the through hole, facilitate the reception and flow guiding of the electrolyte entering the through hole, and reduce the size of the first flow guide piece, the cost and the occupied area of the first flow guide piece in the shell, and ensure the energy density requirement of the battery monomer. The channel is arranged to facilitate the electrolyte flowing along the outer wall of the insulation piece to the end of the shell opposite to the first wall, entering the insulation piece through the channel, and gradually infiltrating from bottom to top.

[0009] In some embodiments, the side wall includes a first wall surface and a second wall surface opposite to each other, the area of the first wall surface is larger than that of the second wall surface, and the first flow guide piece is connected to the first wall surface.

[0010] The first flow guide piece is connected to the first wall surface, which facilitates the close connection between the first flow guide piece and the insulation piece, avoids interference between the first flow guide piece and other components of the battery monomer such as the insulation plate, and guides the electrolyte entering the through hole to the first wall surface side of the insulation piece, facilitating the infiltration of the electrolyte.

[0011] In some embodiments, the first flow guide piece is in an integral structure, one end of the first flow guide piece is connected to one of the first wall surfaces opposite to each other, and the other end of the first flow guide piece is connected to the other of the first wall surfaces opposite to each other.

[0012] The first flow guide piece is in an integral structure, which ensures the guiding and bearing capacity of the electrolyte and reduces the probability of the electrolyte entering the opening and flowing into the electrode assembly from top to bottom.

[0013] In some embodiments, the first flow guide piece includes a first sub-flow guide part and a second sub-flow guide part, the first sub-flow guide part and the second sub-flow guide part are opposite to each other and connected at one end thereof, and the other end of the first sub-flow guide part and the second sub-flow guide part is connected to the insulation piece, respectively.

[0014] The above arrangement can also meet the requirement that the electrolyte and other fluids entering the through hole can be guided to the outside of the insulation piece away from the accommodation cavity by the first flow guide piece, and under the action of gravity, flow along the outer wall of the insulation piece to the end of the shell opposite to the first wall, and gradually infiltrate from bottom to top as the electrolyte accumulates, avoiding the liquid sealing phenomenon when the electrolyte infiltrates from the periphery to the middle area. Moreover, the above arrangement facilitates the connection and synchronous forming of the first flow guide piece and the insulation piece, and reduces the forming difficulty.

[0015] In some embodiments, the first sub-guide part has a first guide groove, the second sub-guide part has a second guide groove, one end of the second sub-guide part is accommodated in the first guide groove, and the first guide groove and the second guide groove are in communication.

[0016] The split lap form facilitates the molding of the first guide member and the insulating member, and can ensure the guiding requirement of the electrolyte.

[0017] In some embodiments, the battery monomer further comprises a second guide member arranged on the outer side of the insulating member away from the accommodation cavity, and the second guide member is arranged in communication with the first guide member.

[0018] By arranging the second guide member, the electrolyte guided by the first guide member to the outer side of the insulating member away from the accommodation cavity can be oriented again, so that it can quickly flow into the bottom of the shell in a laminar flow, and the electrolyte can climb under the action of capillary force, the impregnation of the electrode assembly can be realized by downward directional impregnation, avoiding the liquid seal phenomenon caused by the electrolyte impregnating from the periphery to the middle.

[0019] In some embodiments, the second guide member comprises a third guide groove arranged on the outer side of the insulating member.

[0020] By arranging the third guide groove in the second guide member, the molding of the second guide member is facilitated, and the third guide groove is formed by removing material, without occupying additional internal space of the shell, ensuring the size requirement of the electrode assembly, and further ensuring the energy density requirement of the battery monomer.

[0021] In some embodiments, the first guide member has a first port and a second port, and the first port and the second port are respectively connected with the second guide member.

[0022] The arrangement of the first port and the second port and the connection with the second guide member can guide the electrolyte from both sides to the bottom of the shell, which can ensure the injection efficiency of the electrolyte, and at the same time, can reduce the risk of accumulation and overflow of the electrolyte in the first guide member and the risk of upward impregnation of the electrolyte from the side where the through hole is located.

[0023] In some embodiments, the second guide member is arranged in pairs, and the second guide members arranged in pairs are spaced apart and symmetrically distributed on the insulating member.

[0024] Through the above arrangement, the electrolyte can be guided from both sides to the bottom of the shell, which can ensure the injection efficiency of the electrolyte, and at the same time, can reduce the risk of accumulation and overflow of the electrolyte in the first guide member and the risk of upward impregnation of the electrolyte from the side where the through hole is located.

[0025] In some embodiments, the second guide member is arranged in a straight line trajectory.

[0026] By extending the second flow guide along a straight line trajectory, the resistance in the process of guiding the electrolyte can be reduced, and the electrolyte can be quickly guided to the bottom of the shell and then climb up from bottom to top by capillary action.

[0027] In some embodiments, the second flow guide extends along a broken line trajectory.

[0028] Through the above arrangement, when the first port or the second port of the first flow guide is staggered with the flow outlet of the second flow guide, communication can be achieved by extending along a broken line trajectory, ensuring the directional flow requirement of the electrolyte.

[0029] In some embodiments, the second flow guide includes a main flow guide and a plurality of sub-flow guides, the main flow guide is in communication with the first flow guide, and each sub-flow guide is arranged separately from each other and in communication with the main flow guide.

[0030] The second flow guide adopts the cooperation of the main flow guide and the sub-flow guide, which is beneficial to guiding the electrolyte to different positions at the bottom of the shell and ensuring the uniformity of electrolyte infiltration.

[0031] In some embodiments, the plurality of sub-flow guides are distributed in the first direction, and one of the sub-flow guides is located at the center position of the insulating piece in the first direction.

[0032] Since the probability of liquid sealing phenomenon existing in the electrode assembly corresponding to the center position of the insulating piece is relatively high, by locating one of the sub-flow guides at the center position of the insulating piece in the first direction, the electrolyte can be climbed at the center position of the insulating piece corresponding to the electrode assembly, and the probability of liquid sealing is reduced. The sub-flow guides arranged on both sides of the center position can ensure the uniformity of the electrode assembly from bottom to top.

[0033] In some embodiments, the first flow guide and the insulating piece are in an integrated structure.

[0034] Through the above arrangement, the connection strength between the first flow guide and the insulating piece can be ensured.

[0035] In a second aspect, the application provides a battery device including the above-mentioned battery monomer.

[0036] In a third aspect, the application provides a power consumption device including the above-mentioned battery device.

[0037] 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

[0038] 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

[0039] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0040] Figure 2 is a structural schematic diagram of a battery device provided by an embodiment of the present application;

[0041] Figure 3 is an exploded schematic diagram of a battery cell provided by an embodiment of the present application;

[0042] Figure 4 is an unfolded schematic diagram of an insulating member and a first flow guide member provided by an embodiment of the present application;

[0043] Figure 5 is a use state diagram of an insulating member and a first flow guide member provided by an embodiment of the present application;

[0044] Figure 6 is an unfolded schematic diagram of an insulating member and a first flow guide member provided by another embodiment of the present application;

[0045] Figure 7 is a use state diagram of an insulating member and a first flow guide member provided by another embodiment of the present application;

[0046] Figure 8 is an unfolded schematic diagram of an insulating member and a first flow guide member provided by yet another embodiment of the present application;

[0047] Figure 9 is a use state diagram of an insulating member and a first flow guide member provided by yet another embodiment of the present application;

[0048] Figure 10 is an unfolded schematic diagram of an insulating member and a first flow guide member provided by yet another embodiment of the present application;

[0049] Figure 11 is an unfolded schematic diagram of an insulating member and a first flow guide member provided by yet another embodiment of the present application;

[0050] Figure 12 is an unfolded schematic diagram of an insulating member and a first flow guide member provided by yet another embodiment of the present application.

[0051] Label Explanation:

[0052] 1. vehicle; 100. battery device; 200. battery module; 300. controller; 400. motor;

[0053] 10, box; 11, first box part; 12, second box part;

[0054] 20, battery cell; 20a, outer shell; 201, first wall; 202, through hole;

[0055] 21, housing;

[0056] 22, electrode assembly;

[0057] 23, cover plate; 231, electrode terminal;

[0058] 24, insulating member; 241, bottom wall; 242, side wall; 2421, first wall surface; 2422, second wall surface; 243, accommodating cavity; 244, opening; 255, passage;

[0059] 25, first flow guide member; 25a, first port; 25b, second port;

[0060] 251, first sub-flow guide part; 2511, first groove bottom wall; 2512, first groove side wall; 2513, first flow guide groove;

[0061] 252, second sub-flow guide part; 2521, second groove bottom wall; 2522, second groove side wall; 2523, second flow guide groove;

[0062] 26, second flow guide member; 261, main flow guide; 262, sub-flow guide;

[0063] X, width direction; Y, thickness direction; Z, height direction. DETAILED DESCRIPTION

[0064] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0065] 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.

[0066] In the description of the embodiments of the present application, 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 indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0067] In addition, the technical terms "first", "second" and the like are only for descriptive 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 explicitly specified and limited.

[0068] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it 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.

[0069] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "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", "above" and "above" 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", "below" and "below" 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.

[0070] 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 hydroelectric, thermal, wind and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields.

[0071] With the continuous expansion of the application field of power batteries, the market demand is also increasing. The battery monomer in the related technology has the phenomenon of lithium precipitation on the pole piece, which affects the reliability of the battery monomer. Research has found that the battery monomer in the related technology stores electrolyte in the recess cavity on the insulating piece when injecting electrolyte, so that the electrode assembly is infiltrated from multiple directions, improving the injection efficiency and improving the infiltration effect. However, this setting method makes the electrolyte infiltrate from the periphery to the middle when injecting, which will cause the liquid sealing phenomenon, and then the middle lithium precipitation phenomenon occurs in the pole piece during the cycle process, which affects the reliability of the battery monomer.

[0072] In order to solve the above technical problems, the infiltration direction of the electrolyte can be changed, so that the electrolyte is infiltrated from bottom to top, avoiding the liquid sealing phenomenon when the electrolyte is infiltrated from the periphery to the middle area, so as to ensure that the pole piece is uniformly infiltrated, improve the battery pole piece black spot, and improve the reliability of the battery monomer. Therefore, an embodiment of the present application provides a battery monomer, which comprises a shell, an insulating piece, an electrode assembly and a first flow guide piece. The shell comprises a first wall, and the first wall is provided with a through hole. The insulating piece is arranged in the shell, and the insulating piece has a containing cavity and an opening communicating with the containing cavity. The opening is arranged towards the first wall, and the electrode assembly is arranged in the containing cavity. The first flow guide piece is located between the first wall and the electrode assembly, the orthographic projection of the first flow guide piece on the first wall covers the through hole, the first flow guide piece is arranged across the opening and connected to the insulating piece, so that the electrolyte and other fluids entering through the through hole can be guided to the outside of the insulating piece away from the containing cavity through the first flow guide piece. Under the action of gravity, the electrolyte flows along the outer wall surface of the insulating piece to the end of the shell opposite to the first wall. The electrolyte can climb under the action of capillary force, gradually infiltrate from bottom to top, avoid the liquid sealing phenomenon when the electrolyte is infiltrated from the periphery to the middle area, so that the pole piece is uniformly infiltrated, the battery pole piece black spot is improved, and then the lithium precipitation phenomenon in the battery monomer during use is avoided, and the reliability of the battery monomer is improved.

[0073] The technical scheme described in the embodiment of the present application is applicable to battery devices, and is applicable to power consumption equipment or energy storage equipment using battery devices.

[0074] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0075] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment and energy storage devices using battery devices. However, for the sake of brevity, the following embodiments are illustrated using electric vehicles as an example.

[0076] For example, such as Figure 1 As shown, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The interior of vehicle 1 can house a motor 400, a controller 300, and a battery device 100. The controller 300 controls the battery device 100 to supply power to the motor 400. For example, the battery device 100 can be located at the bottom, front, or rear of vehicle 1. The battery device 100 can be used to power vehicle 1; for example, it can serve as the operating power source for the vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for vehicle 1 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to vehicle 1.

[0077] It should be understood that the technical solutions described in the embodiments of this application are not limited to the above-mentioned vehicle 1, but can also be applied to energy storage devices.

[0078] like Figure 2 As shown, in order to meet different power needs, the battery device 100 includes a housing 10 and battery cells 20. The housing 10 has a receiving cavity, and multiple battery cells 20 are disposed in the receiving cavity.

[0079] The box body 10 can be a simple cuboid or cylinder or sphere structure, or a complex cuboid structure composed of simple cuboid or cylinder or sphere structures, 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 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.

[0080] The box body 10 is used to accommodate the battery monomer 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 mutually covered, and the first box body part 11 and the second box body part 12 jointly define an accommodation cavity for accommodating the battery monomer 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-shaped structure, which is covered on the open side of the second box body part 12 to form the box body 10 with the accommodation cavity; both the first box body part 11 and the second box body part 12 can also be a hollow structure with one side open, and the open side of the first box body part 11 is covered on the open side of the second box body part 12 to form the box body 10 with the accommodation 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.

[0081] In order to improve the sealing performance of the first box body part 11 and the second box body part 12 after being connected, a sealing member such as sealing glue or a sealing ring can be arranged between the first box body part 11 and the second box body part 12.

[0082] Suppose that the first box body part 11 is covered on the top of the second box body part 12, the first box body part 11 can also be called an upper box cover, and the second box body part 12 can also be called a lower box body 10.

[0083] In the battery device 100, the battery monomer 20 can be multiple. If the battery monomer 20 is multiple, the multiple battery monomers 20 can be connected in series, in parallel, or in a mixed connection, and the mixed connection means that some of the multiple battery monomers 20 are connected in series and some are connected in parallel. The multiple battery monomers 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery monomers 20 is accommodated in the box body 10; of course, the multiple battery monomers 20 can first be connected in series, in parallel, or in a mixed connection to form a battery module 200, and then the multiple battery modules 200 are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box body 10.

[0084] The multiple battery monomers 20 in the battery module 200 can be electrically connected through a connecting piece to realize parallel connection, series connection, or mixed connection of the multiple battery monomers 20 in the battery module 200.

[0085] In the embodiments of the present application, the battery monomer 20 can be a secondary battery, which refers to a battery monomer 20 that can be activated by charging after discharging to continue to be used.

[0086] The battery monomer 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the present application is not limited thereto.

[0087] As shown in Figures 3 to 5 The battery monomer 20 provided by one embodiment of the present application includes a shell 20a, an insulating piece 24, an electrode assembly 22, and a first flow guide 25. The shell 20a includes a first wall 201, and the first wall 201 is provided with a through hole 202. The insulating piece 24 is arranged in the shell 20a, and the insulating piece 24 has a receiving cavity 243 and an opening 244 in communication with the receiving cavity 243, and the opening 244 is arranged towards the first wall 201. The electrode assembly 22 is arranged in the receiving cavity 243, and the first flow guide 25 is located between the first wall 201 and the electrode assembly 22, and the first flow guide 25 covers the through hole 202 in the orthographic projection on the first wall 201, and the first flow guide 25 is arranged across the opening 244 and connected to the insulating piece 24.

[0088] The shell 20a included in the battery monomer 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 plays a role of protecting the electrode assembly 22, and the shell 20a and the electrode assembly 22 further include the insulating piece 24, which is used to encapsulate the electrode assembly 22 and the electrolyte. Specifically, the insulating piece 24 can be a bag-shaped insulating piece or an aluminum-plastic film. When the shell 20a is a sealed structure, it is used to encapsulate the electrode assembly 22, the electrolyte, and other components.

[0089] As an example, the battery monomer 20 can be a cylindrical battery monomer, a prismatic battery monomer, a soft-pack battery monomer, or other shapes of battery monomers, and the prismatic battery monomer includes a square shell battery monomer, a blade-shaped battery monomer, a multi-prismatic battery, such as a hexagonal prism battery, etc., and the present application is not particularly limited.

[0090] The shell 20a of the battery monomer 20 can include a shell body 21 and a cover plate 23, the shell body 21 has a cavity and an opening in communication with the cavity, and the cover plate 23 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 the first wall 201, and optionally, the cover plate 23 includes the first wall 201.

[0091] The electrode assembly 22 includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During charging and discharging of the battery cell 20, active ions (e.g., lithium ions) are inserted into and extracted from the positive electrode and the negative electrode. The separator, which is disposed between the positive electrode and the negative electrode, prevents the positive electrode and the negative electrode from shorting while allowing the active ions to pass through.

[0092] The electrode assembly 22 can have a jelly-roll structure, a stacked structure, or a hybrid structure of the jelly-roll and stacked structures.

[0093] In some embodiments, the electrode assembly 22 has a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0094] In some embodiments, the electrode assembly 22 has a stacked structure.

[0095] For example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0096] For example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked. One positive electrode sheet can be interposed between adjacent folded segments.

[0097] For example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded segments that are stacked.

[0098] For example, a plurality of separators can be provided, and each of the plurality of separators can be interposed between any adjacent positive electrode sheet or negative electrode sheet.

[0099] For example, the separators can be continuously provided and interposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0100] In some embodiments, the electrode assembly 22 can have a cylindrical shape, a flat shape, or a polygonal shape.

[0101] In some embodiments, the electrode assembly 22 can be provided with a tab that can guide current out of the electrode assembly 22. The tab can include a positive tab and a negative tab.

[0102] The insulating member 24 can be provided on the outer side of the electrode assembly 22 and can be used to isolate the electrode assembly 22 from the case 21, thereby preventing the electrode assembly 22 from being in contact with the case 21 and short-circuiting, and ensuring the reliability of the battery cell 20. The insulating member 24 can also prevent the electrode assembly 22 from being scratched and can prevent the case 21 from scratching the surface of the electrode assembly 22 during assembly or use.

[0103] The insulating member 24 can cover a plurality of surfaces of the electrode assembly 22. The insulating member 24 can be formed in an integral structure or by a split bonding method, and can be formed in an integral structure.

[0104] The first flow guide 25 can include an insulator and is disposed at least partially on a side of the electrode assembly 22 facing the through hole 202. The first flow guide 25 is configured to receive electrolyte or the like entering the through hole 202 and direct the flow direction of the electrolyte. For example, the first flow guide 25 can direct the flow direction of the electrolyte such that the electrolyte entering the through hole 202 is guided by the first flow guide 25 to the outside of the insulator 24 facing away from the accommodation cavity 243, and flows along the outer surface of the insulator 24 facing away from the accommodation cavity 243 under the action of gravity to the bottom wall 241 of the housing 20a opposite to the first wall 201. The first flow guide 25 can be a one-piece flow guide structure or a spliced structure of two or more flow guide units. The first flow guide 25 can include a flow guide channel in communication with the through hole 202 or a flow guide groove open to the side of the first wall 201.

[0105] The first flow guide 25 can be connected to at least one of the electrode assembly 22 and the insulator 24, and can be connected to the insulator 24.

[0106] The first flow guide 25 can be connected to at least one of the electrode assembly 22 and the insulator 24, and can be connected to the insulator 24.

[0107] The first flow guide 25 can be connected to at least one of the electrode assembly 22 and the insulator 24, and can be connected to the insulator 24.

[0108] The first flow guide 25 can be connected to at least one of the electrode assembly 22 and the insulator 24, and can be connected to the insulator 24.

[0109] The battery monomer 20 provided by one embodiment of the present application is provided with a through hole 202 on the first wall 201, electrolyte can be injected into the battery monomer 20 through the through hole 202, the first flow guide 25 is arranged between the first wall 201 and the electrode assembly 22, the orthographic projection of the first flow guide 25 on the first wall 201 covers the through hole 202, the first flow guide 25 is arranged across the opening 244 and connected to the insulating piece 24, so that the electrolyte or other fluid entering through the through hole 202 can be guided to the outside of the insulating piece 24 away from the accommodation cavity 243 through the first flow guide 25, under the action of gravity, the electrolyte flows along the outer wall surface of the insulating piece 24 to the end of the housing 20a opposite to the first wall 201, the electrolyte can climb up under the capillary action, gradually soak from bottom to top as the electrolyte accumulates, and the phenomenon of liquid sealing when the electrolyte soaks from the periphery to the middle region is avoided, so that the electrode tabs of the electrode assembly 22 are uniformly soaked, the black spot of the battery electrode tab is improved, and the phenomenon of lithium precipitation in the use of the battery monomer 20 is avoided, and the reliability of the battery monomer 20 is improved.

[0110] As shown in Figures 3 to 5 some embodiments, the insulating piece 24 includes a bottom wall 241 and a side wall 242, the side wall 242 is arranged around the bottom wall 241 and encloses the accommodation cavity 243, the bottom wall 241 is arranged opposite to the opening 244, and the first flow guide 25 is connected to the side wall 242, at least one of the bottom wall 241 and the side wall 242 is provided with a channel 255.

[0111] The bottom wall 241 and the side wall 242 can be arranged to intersect each other, and optionally, the bottom wall 241 and the side wall 242 can be arranged to be perpendicular to each other.

[0112] The shape of the accommodation cavity 243 can match at least part of the shape of the electrode assembly 22. The electrode assembly 22 can be at least partially located in the accommodation cavity 243. Optionally, the bottom surface of the electrode assembly 22 can be arranged to abut the bottom wall 241, and the side surface of the electrode assembly 22 can be arranged to abut the side wall 242.

[0113] The insulating piece 24 and the electrode assembly 22 can be connected and fixed by adhesion, or can be connected and fixed by heat pressing or the like.

[0114] The first flow guide 25 can be connected to the side wall 242 and arranged to bend relative to the side wall 242.

[0115] The channel 255 can include a hole, a groove or the like structure, for connecting the gap between the insulating piece 24 and the housing 21 to the accommodation cavity 243, so that the electrolyte flowing along the outer wall surface of the insulating piece 24 to the end of the housing opposite to the first wall 201 enters the accommodation cavity 243 in the insulating piece 24 through the channel 255 and soaks the electrode assembly 22 from bottom to top.

[0116] Optionally, the first flow guide 25 and the bottom wall 241 can be oppositely arranged along the axial direction of the through hole 202.

[0117] Optionally, the side of the first flow guide 25 facing the through hole 202 can have a U-shaped groove.

[0118] In an embodiment, the insulating member 24 has the above structure, which can isolate the electrode assembly 22 from the shell 21, prevent the electrode assembly 22 from being short-circuited by contacting the shell 21, and ensure the reliability of the battery monomer 20. The first flow guide 25 is connected to the side wall 242, which can fix the relative position of the first flow guide 25 and the through hole 202, facilitate the reception and flow of the electrolyte entering the through hole 202, and reduce the size of the first flow guide 25, the cost, and the occupied area of the first flow guide 25 in the shell 20a, ensure the energy density requirement of the battery monomer 20, and facilitate the electrolyte flowing from the outer wall of the insulating member 24 to the end of the shell opposite to the first wall 201 to enter the accommodating cavity 243 of the insulating member 24 through the channel 255 and soak the electrode assembly 22 from bottom to top.

[0119] In some embodiments, the side wall 242 includes oppositely arranged first wall surfaces 2421 and oppositely arranged second wall surfaces 2422, the area of the first wall surface 2421 is larger than the area of the second wall surface 2422, and the first flow guide 25 is connected to the first wall surface 2421.

[0120] Optionally, the first wall surface 2421 and the second wall surface 2422 can be alternately arranged around the bottom wall 241.

[0121] 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 shell 21, and the second wall surface 2422 is used to isolate the side surface of the electrode assembly 22 from the shell 21.

[0122] By connecting the first flow guide 25 to the first wall surface 2421, the first flow guide 25 can be connected to the insulating member 24 in proximity, and interference between the first flow guide 25 and other components of the battery monomer 20, such as the insulating plate, can be avoided. In addition, the electrolyte entering the through hole 202 can be guided to the side of the first wall surface 2421 of the insulating member 24 by the first flow guide 25, which facilitates the soaking of the electrolyte.

[0123] In some embodiments, the first flow guide 25 has an integral structure, one end of the first flow guide 25 is connected to one of the oppositely arranged first wall surfaces 2421, and the other end of the first flow guide 25 is connected to the other of the oppositely arranged first wall surfaces 2421.

[0124] In the arrangement direction of the two opposing first wall surfaces 2421, the first guide member 25 has an integral structure and can be set without interruption in the middle.

[0125] Optionally, the length of the first guide member 25 may be greater than or equal to the distance between the two first walls 2421. One end of the first guide member 25 may be connected to one end of the two first walls 2421 facing the through hole 202, and the other end of the first guide member 25 may be connected to the other end of the two first walls 2421 facing the through hole 202.

[0126] Of course, this is an optional implementation. In some embodiments, the length of the first guide member 25 may be greater than or equal to the distance between the two second walls 2422. One end of the first guide member 25 may be connected to one end of the two second walls 2422 facing the through hole 202, and the other end of the first guide member 25 may be connected to the other end of the two second walls 2422 facing the through hole 202.

[0127] The first guide element 25 is an integral structure, which makes the first guide element 25 non-disconnected in the direction of electrolyte flow, ensuring the guiding and carrying capacity of the electrolyte, and reducing the probability that the electrode liquid enters through the opening 244 and flows from top to bottom into the electrode assembly 22.

[0128] It is understandable that the first guide element 25 being a one-piece structure is only one optional embodiment.

[0129] like Figure 6 , Figure 7 As shown, in some embodiments, the first guide member 25 may also include a first sub-guide member 251 and a second sub-guide member 252. The first sub-guide member 251 and the second sub-guide member 252 are disposed opposite to each other and their ends facing each other are connected. The ends of the first sub-guide member 251 and the second sub-guide member 252 that are away from each other are respectively connected to the insulating member 24, and optionally connected to the side wall 242 of the insulating member 24.

[0130] Both the first sub-guide section 251 and the second sub-guide section 252 can have a guide channel or a guide groove. The ends of the first sub-guide section 251 and the second sub-guide section 252 facing each other can be arranged facing each other and sealed together. Alternatively, the ends of the first sub-guide section 251 and the second sub-guide section 252 facing each other can be stacked and overlapped and fixed together.

[0131] The orthographic projections of the first sub-guide section 251 and the second sub-guide section 252 on the first wall 201 can both cover the through hole 202. Of course, it is also possible for the orthographic projection of either the first sub-guide section 251 or the second sub-guide section 252 on the first wall 201 to cover the through hole 202.

[0132] Optionally, the first sub-flow guide part 251 can be connected with one of the first wall surfaces 2421, and the second sub-flow guide part 252 can be connected with the other first wall surface 2421. In the arrangement direction of the two first wall surfaces 2421, or the thickness direction Y, the sum of the lengths of the first sub-flow guide part 251 and the second sub-flow guide part 252 extending towards each other is greater than or equal to the distance between the two first wall surfaces 2421.

[0133] Of course, in some embodiments, the first sub-flow guide part 251 can also be connected with one of the second wall surfaces 2422, and the second sub-flow guide part 252 can be connected with the other second wall surface 2422. In the arrangement direction of the two second wall surfaces 2422, or the width direction X, the sum of the lengths of the first sub-flow guide part 251 and the second sub-flow guide part 252 extending towards each other is greater than or equal to the distance between the two second wall surfaces 2422.

[0134] Optionally, the U-shaped groove of the first flow guide part 25 includes the first flow guide groove 2513 and the second flow guide groove 2523 connected with each other, that is, when the first flow guide part 25 adopts a split setting form, it can also have a U-shaped groove, which is convenient for receiving and guiding the electrolyte.

[0135] The battery monomer 20 provided by an embodiment of the application can also meet the requirement that the electrolyte and other fluids entering through the through hole 202 can be guided by the first flow guide part 25 to the outside of the insulating part 24 away from the accommodation cavity 243, and under the action of gravity, flow along the outer wall surface of the insulating part 24 to the end of the housing 20a opposite to the first wall 201, gradually soak from bottom to top as the electrolyte accumulates, avoiding the liquid sealing phenomenon when the electrolyte soaks from the periphery to the middle area. Moreover, the above setting mode is also conducive to the connection and synchronous forming of the first flow guide part 25 and the insulating part 24, and reduces the forming difficulty.

[0136] In some embodiments, the first sub-flow guide part 251 has the first flow guide groove 2513, the second sub-flow guide part 252 has the second flow guide groove 2523, one end of the second sub-flow guide part 252 is accommodated in the first flow guide groove 2513, and the first flow guide groove 2513 and the second flow guide groove 2523 are connected with each other.

[0137] The split lapping form is conducive to the forming of the first flow guide part 25 and the insulating part 24, and can ensure the guiding requirement of the electrolyte.

[0138] In some optional embodiments, the first sub-flow guide part 251 and the second sub-flow guide part 252 are arranged in a stacked manner and fixedly connected with each other at the ends thereof towards each other.

[0139] The width of the first flow guide groove 2513 can be greater than the width of the second flow guide groove 2523, and the second sub-flow guide part 252 is partially inserted into the first flow guide groove 2513 and overlaps the first flow guide part.

[0140] Exemplarily, the first sub-flow guide part 251 has a first groove bottom wall 2511 and oppositely arranged first groove side walls 2512, and the first flow guide groove 2513 is formed by the first groove bottom wall 2511 and the oppositely arranged first groove side walls 2512. The second sub-flow guide part 252 has a second groove bottom wall 2521 and oppositely arranged second groove side walls 2522, and the second flow guide groove 2523 is formed by the second groove bottom wall 2521 and the oppositely arranged second groove side walls 2522. The width of the first groove bottom wall 2511 can be greater than the width of the second groove bottom wall 2521, and the second groove bottom wall 2521 is arranged in layers on the first groove bottom wall 2511, and the second groove side wall 2522 is partially arranged between the oppositely arranged first groove side walls 2512. Optionally, the first groove side wall 2512 and the oppositely arranged second groove side wall 2522 can be arranged in layers or attached.

[0141] As shown in Figure 8 , Figure 9 In some embodiments, the battery monomer 20 further includes a second flow guide 26 arranged on the outer side of the insulation 24 away from the accommodation cavity 243, and the second flow guide 26 is arranged in communication with the first flow guide 25.

[0142] The second flow guide 26 can include a flow guide groove formed by removing part of the material on the outer side wall 242 of the insulation 24, or can include a flow guide structure connected and arranged on the outer side wall 242 of the insulation 24.

[0143] The second flow guide 26 can be arranged on the outer side of the side wall 242 of the insulation 24 away from the accommodation cavity 243. When arranged on the side wall 242 of the insulation 24, it can be arranged on at least one of the first wall surface 2421 and the second wall surface 2422 and in communication with the first flow guide 25.

[0144] By arranging the second flow guide 26, the electrolyte guided by the first flow guide 25 to the outer side of the insulation 24 away from the accommodation cavity 243 can be oriented and guided again, so that it can quickly flow into the bottom of the shell 20a. The electrolyte can climb under the action of capillary force, and the impregnation of the electrode assembly 22 can be realized by downward directional impregnation, avoiding the liquid seal phenomenon caused by the electrolyte impregnating from the periphery to the middle.

[0145] In some embodiments, the second flow guide 26 includes a third flow guide groove arranged on the outer side of the insulation 24.

[0146] The third flow guide groove can be formed on the outer side of the insulating member 24 away from the accommodating cavity 243 by etching or the like, and the third flow guide groove is in communication with the first flow guide member 25 to guide the electrolyte to flow to the bottom of the shell 20a.

[0147] The third flow guide groove has a groove depth less than the wall thickness of the insulating member 24.

[0148] The third flow guide groove can be arranged on the side wall 242 of the insulating member 24. For example, the third flow guide groove can be arranged on one of the first wall surface 2421 and the second wall surface 2422 of the insulating member 24.

[0149] By arranging the second flow guide member 26 to include the third flow guide groove, the second flow guide member 26 is facilitated to be formed, and the third flow guide groove is formed by removing material, without occupying additional internal space of the shell 20a, to ensure the size requirement of the electrode assembly 22, and further ensure the energy density requirement of the battery cell 20.

[0150] In some embodiments, the first flow guide member 25 has a first port 25a and a second port 25b, and the first port 25a and the second port 25b are respectively connected with the second flow guide member 26.

[0151] The first port 25a and the second port 25b of the first flow guide member 25 are used for the outflow of the electrolyte entering the first flow guide member 25, and the first port 25a and the second port 25b can be distributed in the thickness direction Y of the battery cell 20, or can be understood as being distributed in the arrangement direction of the two first wall surfaces 2421. Of course, the first port 25a and the second port 25b can also be distributed in the width direction X of the battery cell 20, or can be understood as being distributed in the arrangement direction of the two second wall surfaces 2422.

[0152] As shown in Figures 3 to 9 The distribution can be understood as being arranged oppositely, or can be offset. For example, the first port 25a and the second port 25b can be arranged oppositely in the thickness direction Y of the battery cell 20, and the first flow guide member 25 extends linearly in the thickness direction Y. Of course, the first port 25a and the second port 25b can also be arranged offsetly in the thickness direction Y of the battery cell 20, and the first flow guide member 25 is arranged along an inclined line.

[0153] The first port 25a and the second port 25b are respectively connected with the second flow guide member 26. It can be understood that the first port 25a and the second port 25b are respectively arranged with the second flow guide member 26, and the electrolyte can be guided to the bottom of the shell 20a by the second flow guide member 26 connected therewith.

[0154] The battery cell 20 provided in one embodiment of the present application, the first port 25a and the second port 25b are arranged and connected with the second flow guide 26 respectively, which can guide the electrolyte from both sides to the bottom of the shell 20a, which can ensure the injection efficiency of the electrolyte, and at the same time, can reduce the risk of accumulation and overflow of the electrolyte in the first flow guide 25 and the risk of infiltration of the electrode assembly 22 from top to bottom by the side where the through hole 202 is located.

[0155] As shown in Figure 8 , Figure 9 In some embodiments, the second flow guide 26 is arranged in pairs, and the second flow guides arranged in pairs are spaced apart from each other and symmetrically distributed on the insulating member 24.

[0156] The second flow guide 26 can include one pair or multiple pairs. When multiple pairs are included, each second flow guide 26 is directly or indirectly communicated with the first flow guide 25.

[0157] Optionally, one of the second flow guides arranged in pairs is communicated with the first port 25a and the other is communicated with the second port 25b.

[0158] Through the above arrangement, the electrolyte can be guided from both sides to the bottom of the shell 20a, which can ensure the injection efficiency of the electrolyte, and at the same time, can reduce the risk of accumulation and overflow of the electrolyte in the first flow guide 25 and the risk of infiltration of the electrolyte from top to bottom by the side where the through hole 202 is located.

[0159] As shown in Figures 8 to 10 In some optional embodiments, the second flow guide 26 is arranged along a straight line trajectory.

[0160] The straight line trajectory can be a straight line extending along the thickness direction Y or the width direction X, or a straight line trajectory with a certain inclination angle with respect to the thickness direction Y or the width direction X.

[0161] The straight line trajectory can be understood as the flow trajectory of the electrolyte after entering the second flow guide 26. It can also be determined as the above-mentioned straight line trajectory by taking the extension trajectory of the center line of the first port 25a and the second port 25b.

[0162] By making the second flow guide 26 extend along a straight line trajectory, the resistance when guiding the electrolyte can be reduced, and the electrolyte can be quickly guided to the bottom of the shell 20a and then climb up from bottom to top by capillary action.

[0163] It can be understood that the second flow guide 26 is arranged along a straight line trajectory, which is an optional embodiment.

[0164] As shown in Figure 11 In some embodiments, the second flow guide 26 can also be arranged along a broken line trajectory.

[0165] The broken line trajectory can be understood as the flow trajectory of the electrolyte after entering the second flow guide 26.

[0166] Through the above arrangement, when the first port 25a or the second port 25b of the first flow guide 25 is staggered with the flow outlet of the second flow guide 26, the communication can be realized by extending along the broken line trajectory, and the directional flow requirement of the electrolyte is ensured.

[0167] As shown in Figure 12 In some embodiments, the second flow guide 26 includes a main flow guide 261 and a plurality of sub-flow guides 262, the main flow guide 261 is in communication with the first flow guide 25, and each sub-flow guide 262 is arranged in a spaced manner and is in communication with the main flow guide 261.

[0168] The main flow guide 261 is used to communicate with the first flow guide 25 and receive the electrolyte guided by the first flow guide 25, and each sub-flow guide 262 is in communication with the main flow guide 261 and is used to guide the electrolyte flowing to the main flow guide 261 to different positions at the bottom of the shell 20a.

[0169] The number of sub-flow guides 262 can be two, three or more.

[0170] Each sub-flow guide 262 can be arranged in a spaced and parallel manner, and of course, the extension direction of each sub-flow guide 262 can also be partially intersected.

[0171] The second flow guide 26 adopts the cooperation form of the main flow guide 261 and the sub-flow guide 262, which is beneficial to guide the electrolyte to different positions at the bottom of the shell 20a and ensure the uniformity of electrolyte infiltration.

[0172] In some embodiments, a plurality of sub-flow guides 262 are distributed in a spaced manner in the first direction, and one of the sub-flow guides 262 is located at the central position of the insulating member 24 in the first direction.

[0173] The first direction can be the width direction X of the battery monomer 20, or the thickness direction Y of the battery monomer 20. Taking the first direction as the width direction X of the battery monomer 20 as an example. The center position is the same distance from both sides of the battery monomer 20 in the width direction X. The center position can pass through the center line of the battery monomer 20 in the width direction X and extend a distance to both sides of the center line in the width direction X. The number of sub-flow guides 262 can be one, two or more, and when it is more, they can be arranged in a spaced manner in the width direction X.

[0174] Since the center position of the insulation piece 24 corresponds to the electrode assembly 22 with a high probability of liquid seal phenomenon, by locating one of the sub-conducting fluids 262 at the center position of the insulation piece 24 in the first direction, it is beneficial to the electrolyte climbing at the center position of the insulation piece 24 corresponding to the electrode assembly 22, and reduces the probability of liquid seal. The two sides of the center position are provided with the sub-conducting fluid 262, which can ensure the uniformity of the electrode assembly 22 from bottom to top.

[0175] The above and below mentioned from bottom to top can be understood as the height direction Z of the electrode assembly 22, or in other words, the arrangement direction of the bottom wall 241 and the opening 244 of the insulation piece 24, the position of the bottom wall 241 is the bottom, and the position of the opening 244 is the top.

[0176] In some optional embodiments, the battery monomer 20 provided by an embodiment of the application is provided with a first conducting fluid 25 and an insulation piece 24 in an integrated structure.

[0177] Through the above setting, the connection strength between the first conducting fluid 25 and the insulation piece 24 can be ensured.

[0178] As Figures 3 to 5As shown, one embodiment of the present application provides a battery cell 20, which comprises a shell 20a, an insulation member 24, an electrode assembly 22, a first flow guide 25 and a second flow guide 26. The shell 20a is in a square shape as a whole, and the shell 20a comprises a shell body 21 and a cover plate 23, the cover plate 23 can be arranged on the shell body 21 and connected with the shell body 21, the cover plate 23 comprises a first wall 201, and the cover plate 23 is provided with an electrode terminal 231. The electrode assembly 22 is arranged in the shell 20a, and the electrode assembly 22 can comprise a winding form, and the axial direction of the winding electrode assembly 22 can be arranged in the same direction as the axial direction of a through hole 202. The insulation member 24 is arranged to cover the electrode assembly 22, and the insulation member 24 comprises a bottom wall 241 and a side wall 242, the side wall 242 is arranged around the bottom wall 241, and the bottom wall 241 and the side wall 242 enclose a containing cavity 243 with an opening 244, the electrode assembly 22 is arranged in the containing cavity 243, and the opening 244 is arranged towards the first wall 201. The electrode assembly 22 is arranged in the containing cavity 243, the side wall 242 comprises a first wall surface 2421 and a second wall surface 2422 arranged oppositely, the area of the first wall surface 2421 is greater than the area of the second wall surface 2422, and the first flow guide 25 is connected to the first wall surface 2421. The first flow guide 25 is located between the first wall 201 and the electrode assembly 22, the first flow guide 25 covers the through hole 202 on the first wall 201 in orthographic projection, the first flow guide 25 is arranged across the opening 244, the first flow guide 25 is connected to the first wall surface 2421. The first flow guide 25 comprises a first sub-flow guide part 251 and a second sub-flow guide part 252, the first sub-flow guide part 251 and the second sub-flow guide part 252 are arranged oppositely and connected to each other at one end thereof, and the other end of the first sub-flow guide part 251 and the second sub-flow guide part 252 is connected with one of the first wall surfaces 2421 respectively. The first sub-flow guide part 251 has a first flow guide groove 2513, the second sub-flow guide part 252 has a second flow guide groove 2523, one end of the second sub-flow guide part 252 is arranged in the first flow guide groove 2513, and the first flow guide groove 2513 and the second flow guide groove 2523 are connected, and the first flow guide 25 and the insulation member 24 are in an integral structure.The second flow guide 26 is arranged on the outer side of the insulating member 24 away from the accommodating cavity 243, and the second flow guide 26 comprises a third flow guide groove arranged on the outer side of the first wall surface 2421. The first flow guide 25 has a first port 25a and a second port 25b, the first port 25a and the second port 25b are respectively connected with the second flow guide 26, the second flow guide 26 is arranged in pairs, the second flow guide 26 arranged in pairs is spaced apart from each other and symmetrically distributed on the insulating member 24, one of the second flow guide 26 is in communication with the first port 25a, and the other second flow guide 26 is in communication with the second port 25b. The second flow guide 26 is arranged along a straight line track, and extends in the height direction Z of the battery monomer 20 or the axial direction of the through hole 202. The second flow guide 26 is arranged on the two opposite first wall surfaces 2421, and the length of the second flow guide 26 can be equal to the size of the first wall surface 2421 in the height direction Z.

[0179] At 25 DEG C, 1C charging, 1C discharging, after injection, 45 DEG C, 24h, disassembly of the battery, weighing the free electrolyte of the battery, comparison: the free electrolyte of the traditional battery monomer is 40g, and the free electrolyte of the battery monomer provided with the first flow guide 25 is 28g. Cycle test for 500 weeks: the capacity retention rate of the traditional battery monomer is 88%, and the lithium precipitation area ratio of the anode plate in the full charge state is 35%; the capacity retention rate of the battery monomer provided with the first flow guide 25 is 96%, and the lithium precipitation area ratio of the anode plate in the full charge state is 4%, and the reliability is more advantageous.

[0180] In the second aspect, the application provides a battery device 100 comprising the battery monomer 20 described above.

[0181] In the third aspect, the application provides a power consumption device comprising the battery device 100 described above.

[0182] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and description of the application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell comprising a first wall, wherein a through hole is arranged on the first wall; an insulating piece arranged in the shell, wherein the insulating piece has a containing cavity and an opening in communication with the containing cavity, the opening is arranged towards the first wall, the insulating piece comprises a bottom wall and a side wall, the side wall is arranged around the bottom wall and encloses the containing cavity, the bottom wall is arranged opposite to the opening, and the bottom wall is provided with a channel; an electrode assembly arranged in the containing cavity; a first flow guide located between the first wall and the electrode assembly, wherein a normal projection of the first flow guide on the first wall covers the through hole, the first flow guide is arranged across the opening and connected to the insulating piece, the first flow guide is used for receiving fluid entering from the through hole and guiding directional flow of the fluid, so that the fluid entering from the through hole is guided to the outside of the insulating piece away from the containing cavity through the first flow guide.

2. The battery cell of claim 1, wherein, The side wall comprises oppositely arranged first wall surfaces and oppositely arranged second wall surfaces, the area of the first wall surfaces is greater than the area of the second wall surfaces, and the first flow guide is connected to the first wall surfaces.

3. The battery cell of claim 2, wherein, The first flow guide is in an integral structure, one end of the first flow guide is connected to one of the oppositely arranged first wall surfaces, and the other end of the first flow guide is connected to the other of the oppositely arranged first wall surfaces.

4. The battery cell of claim 1, wherein, The first flow guide comprises a first sub-flow guide part and a second sub-flow guide part, the first sub-flow guide part and the second sub-flow guide part are oppositely arranged and connected to each other at one end, and the other end of the first sub-flow guide part and the second sub-flow guide part is respectively connected to the insulating piece.

5. The battery cell of claim 4, wherein, The first sub-flow guide part has a first flow guide groove, the second sub-flow guide part has a second flow guide groove, one end of the second sub-flow guide part is accommodated in the first flow guide groove, and the first flow guide groove and the second flow guide groove are in communication.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The battery monomer further comprises a second flow guide arranged on the outside of the insulating piece away from the containing cavity, and the second flow guide is arranged in communication with the first flow guide.

7. The battery cell of claim 6, wherein, The second flow guide comprises a third flow guide groove arranged on the outside of the insulating piece.

8. The battery cell of claim 6, wherein, The first flow guide has a first port and a second port, and the first port and the second port are respectively connected with the second flow guide.

9. The battery cell of claim 6, wherein, The second flow guide is arranged in pairs, and the second flow guides arranged in pairs are spaced apart from each other and symmetrically distributed on the insulating piece.

10. The battery cell of claim 6, wherein, The second flow guide is arranged along a straight line trajectory. Alternatively, the second flow guide is arranged along a broken line trajectory.

11. The battery cell of claim 6, wherein, The second flow guide comprises a main flow guide and a plurality of sub-flow guides, the main flow guide is in communication with the first flow guide, and each of the sub-flow guides is arranged spaced apart from each other and in communication with the main flow guide.

12. The battery cell of claim 11, wherein, The plurality of sub-flow guides are distributed in a first direction, and one of the sub-flow guides is located at the center position of the insulating piece in the first direction.

13. The battery cell of claim 11, wherein, The first flow guide and the insulating piece are in an integral structure.

14. A battery device characterized by comprising: The battery device comprises the battery monomer according to any one of claims 1 to 13.

15. An electrical device, characterized by The battery device comprises the battery monomer according to claim 14.

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