Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery cell includes: a case; the end cover assembly is used for defining a liquid injection space with the shell, and the end cover assembly is provided with a liquid injection hole communicating with the liquid injection space; the blocking piece is arranged on the side, close to the liquid injection space, of the end cover assembly, the blocking piece comprises at least one first flow channel, the first end of the first flow channel communicates with the liquid injection hole, the second end of the first flow channel communicates with the liquid injection space, the extending direction of the first flow channel intersects with the penetrating direction of the liquid injection hole, and the blocking piece further comprises a flow limiting part arranged on the first flow channel, the first flow channel is used for limiting liquid in the first flow channel from reversely flowing to the first end. According to the structure of the battery monomer, the problem that liquid in the shell overflows from the liquid injection hole can be solved.

Description

TECHNICAL FIELD

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

[0002] The battery monomer comprises a shell and a cover assembly, the cover assembly covers the opening of the shell to isolate the internal environment of the battery monomer from the external environment. The cover assembly is provided with a liquid injection hole for injecting liquid into the shell, for example, which can be used to inject electrolyte into the shell.

[0003] However, when the battery monomer is transported without sealing the liquid injection hole of the battery monomer, the liquid in the shell may spill out of the liquid injection hole, affecting the quality of the battery monomer. UTILITY MODEL CONTENT

[0004] The present application aims to at least solve one of the technical problems in the background art. To this end, one object of the present application is to provide a battery monomer, a battery and an electric device, which can improve the problem of liquid spilling out of the liquid injection hole in the shell.

[0005] An embodiment of the first aspect of the present application provides a battery monomer, comprising: a shell; a cover assembly for surrounding a liquid injection space with the shell, the cover assembly being provided with a liquid injection hole communicating with the liquid injection space; a baffle arranged on one side of the cover assembly close to the liquid injection space, the baffle comprising at least one first flow channel, a first end of the first flow channel communicating with the liquid injection hole, a second end of the first flow channel communicating with the liquid injection space, an extension direction of the first flow channel intersecting a penetration direction of the liquid injection hole, the baffle further comprising: a flow limiting portion arranged in the first flow channel for limiting the reverse flow of liquid in the first flow channel to the first end.

[0006] In the technical solution of the embodiment of the present application, the first end of the first flow channel of the baffle communicates with the liquid injection hole, and the second end communicates with the liquid injection space, so that the liquid injected from the liquid injection hole can be injected into the first flow channel and flow from the first end to the second end to flow into the liquid injection space, so that the injected liquid can be blocked by the baffle, the kinetic energy is reduced, the impact force of the injected liquid is reduced, thereby reducing the probability of splashing of the liquid from the liquid injection hole. The baffle further comprises a flow limiting portion arranged in the first flow channel, the flow limiting portion being used for limiting the flow of liquid in the first flow channel from the second end to the first end. In this way, the liquid in the first flow channel can be blocked from flowing back to the first end from the second end, thereby greatly reducing the risk of backflow to the first end and spilling out of the liquid injection hole communicating with the first end due to the movement of the liquid in the first flow channel in the first flow channel during transportation of the battery monomer.

[0007] In some embodiments, the flow limiting portion has a first connecting end and a second connecting end penetrating through the flow limiting portion, the first connecting end and the second connecting end are in communication with the first flow channel, the first connecting end is arranged closer to the first end of the first flow channel than the second connecting end, wherein a portion of the first flow channel between the first connecting end and the second connecting end is an intermediate portion, an angle between a liquid outflow direction of the first connecting end and the intermediate portion is an acute angle, and an angle between a liquid inflow direction of the second connecting end and the intermediate portion is an acute angle. In this way, the liquid injected into the first flow channel can flow from the flow limiting portion from the first connecting end to the second connecting end. If the liquid in the first flow channel flows back from the second end to the first end, due to the acute angle between the liquid inflow direction of the second connecting end and the intermediate portion, the backflow liquid in the first flow channel can flow smoothly into the second connecting end and branch off from the flow limiting portion. Due to the acute angle between the liquid outflow direction of the first connecting end and the intermediate portion, the direction of the liquid flowing out of the first connecting end is opposite to the direction of the liquid flowing back from the second end to the first end in the intermediate portion, thereby generating resistance to the backflow liquid in the first flow channel and preventing the liquid in the first flow channel from flowing back to the first end. By arranging the above flow limiting portion, the unidirectional flow of the liquid in the first flow channel is realized, and the flow rate of the liquid in the first flow channel is not affected, and a high liquid injection efficiency can be maintained.

[0008] In some embodiments, the angle between the liquid inflow direction of the second connecting end and the intermediate portion is less than or equal to 30°. Within this range, it is beneficial for the backflow liquid in the first flow channel to flow into the flow limiting portion from the second connecting end, so that the liquid can flow out of the first connecting end in the flow limiting portion to hinder the liquid in the first flow channel from flowing back to the first end.

[0009] In some embodiments, the flow limiting portion includes a first segment and a second segment connected and in communication, an end of the first segment away from the second segment as the first connecting end, and an end of the second segment away from the first segment as the second connecting end, the first segment is a curved segment, and the second segment is a straight segment. In this way, while the flow limiting portion restricts the liquid in the first flow channel from flowing from the second end to the first end, the structure of the flow limiting portion itself is reduced to hinder the liquid in the flow limiting portion from flowing from the first connecting end to the second connecting end, and a high liquid injection efficiency can be maintained.

[0010] In some embodiments, the inner diameter of the flow limiting portion is greater than or equal to the inner diameter of the first flow channel. In this way, the flow rate of the liquid flowing out of the first connecting end of the flow limiting portion is not less than the flow rate of the liquid flowing back to the first end in the first flow channel, so that sufficient resistance can be generated to prevent the liquid in the first flow channel from flowing to the first end, and the success rate of the flow limiting portion in restricting the liquid in the first flow channel from flowing from the second end to the first end is improved.

[0011] In some embodiments, the flow-restricting part arranged in the first flow channel is multiple. In this way, the effect of restricting the liquid in the first flow channel from flowing from the second end to the first end can be enhanced, and the problem of liquid overflow in the liquid injection hole can be further improved.

[0012] In some embodiments, the first flow channel is provided with multiple flow-restricting parts, and the multiple flow-restricting parts are arranged on the same side of the first flow channel in the first direction, which is perpendicular to the extension direction of the first flow channel. In this way, the multiple flow-restricting parts can respectively generate resistance to the liquid in the first flow channel flowing from the second end to the first end at different positions of the first flow channel, greatly reducing the probability of backflow of the liquid in the first flow channel from the second end to the first end.

[0013] In some embodiments, the first flow channel is provided with multiple flow-restricting parts, and the multiple flow-restricting parts are arranged on opposite sides of the first flow channel in the first direction, which is perpendicular to the extension direction of the first flow channel. In this way, when the flow-restricting parts are tangentially communicated with the same side of the first flow channel, the flow-restricting parts arranged on opposite sides of the first flow channel can also intercept the liquid in the first flow channel flowing to the first end from different sides of the first flow channel, thereby improving the success rate of restricting the backflow of the liquid in the first flow channel from the second end to the first end.

[0014] In some embodiments, the flow-restricting parts arranged on opposite sides of the first flow channel are staggered in the extension direction of the first flow channel. That is, the flow-restricting parts arranged on opposite sides of the first flow channel are arranged at different positions of the first flow channel, so as to respectively generate resistance to the liquid in the first flow channel flowing from the second end to the first end at different positions of the first flow channel, thereby further improving the success rate of restricting the backflow of the liquid in the first flow channel from the second end to the first end.

[0015] In some embodiments, the orthographic projections of the two flow-restricting parts arranged on opposite sides of the first flow channel in a projection plane perpendicular to the first direction are spaced apart. That is, the two flow-restricting parts arranged on opposite sides of the first flow channel are completely staggered, so that the multiple flow-restricting parts are relatively dispersed in the extension direction of the first flow channel, so that the multiple flow-restricting parts can take into account the flow restriction of the liquid in the entire first flow channel, thereby further improving the success rate of restricting the backflow of the liquid in the entire first flow channel from the second end to the first end.

[0016] In some embodiments, the number of the first flow channels is multiple, and the blocking piece further comprises: a converging portion opposite to and in communication with the liquid injection hole, the first ends of the first flow channels being connected to the converging portion and communicating with the liquid injection hole through the converging portion; wherein the multiple first flow channels are arranged along the circumferential direction of the converging portion, so that the liquid injected from the liquid injection hole into the converging portion flows into the liquid injection space along the multiple first flow channels. In this way, the liquid injection efficiency can be improved, and since the flow limiting portion is arranged in each first flow channel, the risk of the liquid in the multiple first flow channels flowing back from the second end to the first end, gathering in the converging portion, and overflowing from the liquid injection hole due to excessive liquid in the converging portion can be greatly reduced.

[0017] In some embodiments, the blocking piece further comprises: a converging portion opposite to and in communication with the liquid injection hole, the first ends of the first flow channels being connected to the converging portion and communicating with the liquid injection hole through the converging portion; at least one second flow channel, the first end of the second flow channel being in communication with the converging portion, the second end of the second flow channel being in communication with the liquid injection space, and the extension direction of the second flow channel intersecting the penetrating direction of the liquid injection hole; wherein the at least one first flow channel and the at least one second flow channel are arranged along the circumferential direction of the converging portion, so that the liquid injected from the liquid injection hole into the converging portion flows into the liquid injection space along the first flow channel and the second flow channel. Since no flow limiting portion is arranged in the second flow channel, the flow of the liquid in the second flow channel is not limited, greatly improving the liquid injection efficiency. While the first flow channel is provided with a flow limiting portion to limit the backflow of the liquid to the second end, the amount of liquid flowing back to the converging portion can be reduced as a whole, thereby reducing the phenomenon of liquid overflowing from the liquid injection hole to a certain extent.

[0018] In some embodiments, the liquid injection hole penetrates the end cover assembly along the height direction of the shell, and the extension direction of the first flow channel is perpendicular to the penetrating direction of the liquid injection hole. Since the movement direction of the battery monomer is usually perpendicular to the height direction of the shell during the transportation of the battery monomer, the movement direction of the liquid in the shell relative to the blocking piece is also perpendicular or close to perpendicular to the height direction of the shell. Based on this, the extension direction of the first flow channel is arranged to be perpendicular to the penetrating direction of the liquid injection hole, which is beneficial to reduce the impact of the liquid on the blocking piece during the transportation of the battery monomer, so that the liquid can smoothly pass through the blocking piece through the first flow channel, and is beneficial to reduce the phenomenon that the liquid is blocked by the blocking piece and splashes out of the liquid injection hole.

[0019] In some embodiments, the blocking piece comprises a bottom wall and a side wall, and the side wall connects the bottom wall and the end cover assembly to collectively enclose the at least one first flow channel. The side wall connects the bottom wall and the end cover assembly, which is beneficial to improve the stability of the installation of the blocking piece and the end cover assembly, and is easy to process the blocking piece. On the other hand, the side wall can better block the liquid injected from the liquid injection hole, reducing the probability of the liquid injected from the liquid injection hole splashing out from the gap between the side wall and the end cover assembly.

[0020] The embodiments of the second aspect of the present application provide a battery, comprising the battery cell in the above embodiments.

[0021] The embodiments of the third aspect of the present application provide a power consuming device, comprising the battery in the above embodiments, the battery being configured to provide electric energy.

[0022] The above description is merely a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application and implement the same according to the contents of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0023] In the drawings, like reference numerals refer to same or similar components throughout the several views. These drawings are not necessarily to scale. It should be understood that these drawings only depict some embodiments in accordance with the disclosure and should not be considered limiting of the scope of the disclosure.

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

[0025] Figure 2 Exploded structure diagram of a battery according to some embodiments of the present application;

[0026] Figure 3 Exploded structure diagram of a battery cell according to some embodiments of the present application;

[0027] Figure 4 One of the cross-sectional views of a battery cell according to some embodiments of the present application;

[0028] Figure 5 Exploded structure diagram of an end cap assembly of a battery cell according to some embodiments of the present application;

[0029] Figure 6 One of the cross-sectional views of a baffle according to some embodiments of the present application;

[0030] Figure 7 Two of the cross-sectional views of a baffle according to some embodiments of the present application;

[0031] Figure 8 Three of the cross-sectional views of a baffle according to some embodiments of the present application;

[0032] Figure 9 One of the liquid flow direction diagrams in a baffle according to some embodiments of the present application;

[0033] Figure 10 Two of the liquid flow direction diagrams in a baffle according to some embodiments of the present application;

[0034] Figure 11 Sectional view No. 4 of the stopper of some embodiments of the present application;

[0035] Figure 12 Sectional view No. 5 of the stopper of some embodiments of the present application;

[0036] Figure 13 Sectional view No. 6 of the stopper of some embodiments of the present application;

[0037] Figure 14 Sectional view No. 7 of the stopper of some embodiments of the present application;

[0038] Figure 15 Sectional view No. 2 of the battery cell of some embodiments of the present application;

[0039] Figure 16 Top view structural schematic of the end cap assembly of the battery cell of some embodiments of the present application;

[0040] Figure 17 Perspective structural schematic of the stopper of some embodiments of the present application;

[0041] Figure 18 Sectional view No. 8 of the stopper of some embodiments of the present application;

[0042] Figure 19 Sectional view No. 9 of the stopper of some embodiments of the present application;

[0043] Figure 20 Sectional view No. 10 of the stopper of some embodiments of the present application.

[0044] Explanation of reference numerals:

[0045] Vehicle 1000;

[0046] Battery 100, liquid injection hole 101, stopper 102;

[0047] Controller 200, top cover 211, insulating member 212;

[0048] Motor 300;

[0049] First connection end 431, second connection end 432, first section 433, second section 434;

[0050] Box 10, first portion 11, second portion 12;

[0051] Battery cell 20, end cap assembly 21, electrode terminal 21a, housing 22, electrode assembly 23, tab 23a;

[0052] First through-hole 31, second through-hole 32;

[0053] First flow passage 40, first end 41, second end 42, flow restriction 43

[0054] Converging portion 50

[0055] Second flow passage 60

[0056] Bottom wall 70, first wall portion 71, second wall portion 72, third wall portion 73

[0057] First direction X. DETAILED DESCRIPTION

[0058] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples 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.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having", and any variations thereof, as used in the specification and claims and the aforementioned description of the drawings, are intended to cover not exclusive inclusion.

[0060] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0061] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0063] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0064] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "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 is only for the convenience of describing the embodiments of the present application and simplifying the description, and does 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.

[0065] 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 broadly, 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 communication or 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.

[0066] At present, from the development of market situation, the application of power battery is more and more extensive. Power battery is not only applied to energy storage power supply system such as hydroelectric, thermal, wind and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0067] The battery comprises at least one battery monomer, the battery monomer comprises an end cover assembly and a shell, and the end cover assembly covers the opening of the shell to isolate the internal environment of the battery monomer from the external environment. The end cover assembly is provided with a through liquid injection hole, and liquid such as electrolyte can be injected into the shell through the liquid injection hole.

[0068] In order to reduce the impact force of the liquid during the liquid injection process, especially in the case that the shell is also provided with an electrode assembly, it is necessary to reduce the impact force of the liquid on the electrode assembly during the liquid injection process. A blocking piece is arranged in the shell and is in alignment with the liquid injection hole. After the liquid enters the battery monomer through the liquid injection hole, it will first meet the blocking piece. The electrolyte is first blocked by the blocking piece, and the kinetic energy is reduced, and then flows into the deeper part of the shell along the blocking piece. Due to the blocking effect of the blocking piece on the liquid, the impact force of the liquid can be reduced.

[0069] In the process of transporting the battery monomer, the liquid in the shell is affected by the inertial factor, and the liquid is prone to relative motion with the blocking piece. When the battery monomer suddenly starts to move or stop, the speed difference between the liquid and the blocking piece is large, which causes the liquid to collide with the blocking piece and splash out of the liquid injection hole.

[0070] Based on the above considerations, in order to solve the problem that the liquid in the shell may overflow from the liquid injection hole, a battery monomer is designed, which includes a blocking piece arranged on one side of the end cover assembly close to the liquid injection space. The first end of the first flow channel of the blocking piece is in communication with the liquid injection hole, and the second end is in communication with the liquid injection space, so that the liquid injected from the liquid injection hole can flow into the first flow channel and flow from the first end to the second end to flow into the liquid injection space. The injected liquid can be blocked by the blocking piece, the kinetic energy is reduced, and the impact force of the injected liquid is reduced, thereby reducing the probability of splashing of the liquid from the liquid injection hole. The blocking piece further includes a flow limiting portion arranged in the first flow channel, which is used to limit the flow of the liquid in the first flow channel from the second end to the first end. In this way, the liquid in the first flow channel can be blocked from flowing back to the first end from the second end, thereby greatly reducing the risk of backflow to the first end and overflow from the liquid injection hole in communication with the first end due to the movement of the liquid in the first flow channel in the first flow channel during transportation of the battery monomer.

[0071] The battery monomer disclosed in the embodiments of the present application can be used in, but not limited to, electric devices such as vehicles, ships or aircraft. The power supply system of the electric device can be composed of the battery monomer and the battery disclosed in the present application.

[0072] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0073] The following embodiments are described with reference to a vehicle 1000 as an example of an electric device of an embodiment of the present application for convenience of description.

[0074] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle is provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0075] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0076] Please refer to Figure 2 , Figure 2 A disassembled structural schematic diagram of a battery is provided for some embodiments of the present application. The battery 100 includes a box body 10 and a battery monomer 20, and the battery monomer 20 is contained in the box body 10. Among them, the box body 10 is used to provide a containing space for the battery monomer 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 are overlapped with each other, and the first part 11 and the second part 12 jointly define a containing space for containing the battery monomer 20.

[0077] In the battery 100, the battery monomer 20 can be multiple, and the multiple battery monomers 20 can be connected in series, in parallel or in mixed connection. The mixed connection means that there are series connection and parallel connection among the multiple battery monomers 20. The battery 100 can further include other structures, for example, the battery 100 can further include a current combining component for realizing electrical connection among the multiple battery monomers 20.

[0078] Among them, each battery monomer 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery monomer 20 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0079] Reference Figures 3 to 7The battery cell provided by the embodiments of the present application comprises: a shell 22; an end cover assembly 21 configured to form a liquid injection space with the shell 22, the end cover assembly 21 being provided with a liquid injection hole 101 communicating with the liquid injection space; a baffle 102 arranged on a side of the end cover assembly 21 close to the liquid injection space, the baffle 102 comprising at least one first flow channel 40, a first end 41 of the first flow channel 40 communicating with the liquid injection hole 101, a second end 42 of the first flow channel 40 communicating with the liquid injection space, an extension direction of the first flow channel 40 intersecting a penetrating direction of the liquid injection hole 101, and the baffle 102 further comprising: a flow limiting portion 43 arranged in the first flow channel 40 and configured to limit reverse flow of liquid in the first flow channel 40 to the first end 41.

[0080] Please refer to Figure 3 , Figure 3 The exploded structural schematic diagram of the battery cell provided by some embodiments of the present application is shown. The battery cell 20 refers to the smallest unit constituting a battery. As shown in Figure 3 , the battery cell 20 further comprises an electrode assembly 23 and other functional components.

[0081] The end cover assembly 21 refers to a component covering the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. The liquid injection space formed by the end cover assembly 21 and the shell 22 can accommodate electrolyte, electrode assembly and other components. The shell 22 and the end cover assembly 21 can be independent components, and an opening can be provided on the shell 22, and the end cover assembly 21 is made to cover the opening to form the internal environment of the battery cell 20. Not limitedly, the end cover assembly 21 and the shell 22 can be integrated. Not limitedly, the shape of the end cover assembly 21 can be adapted to the shape of the shell 22 to fit the shell 22.

[0082] As shown in Figure 4 and Figure 5 , in some embodiments, the end cover assembly 21 can comprise a top cover 211 and an insulating member 212, and the insulating member 212 can be used to isolate the electrical connection components in the shell 22 from the end cover to reduce the risk of short circuit. The top cover 211 can have a first through hole 31 penetrating therethrough, and the insulating member 212 can have a second through hole 32 penetrating therethrough, the first through hole 31 and the second through hole 32 being opposite and communicating with each other, and the first through hole 31 and the second through hole 32 together constituting the liquid injection hole 101. That is, the liquid injected from the first through hole 31 flows into the shell 22 after flowing through the first through hole 31 and the second through hole 32.

[0083] The insulating member 212 and the top cover 211 can be connected by means including but not limited to snap connection, adhesive connection and the like.

[0084] The blocking piece 102 can be arranged on the side of the insulating piece 212 away from the top cover 211. The blocking piece 102 and the insulating piece 212 can be two independent structures, and can be connected by means including but not limited to bonding connection, etc. The blocking piece 102 and the insulating piece 212 can also be an integrated structure.

[0085] Exemplarily, the insulating piece 212 can be a lower plastic piece, and the meaning of the lower plastic piece is the same as that commonly understood by the person skilled in the art of the embodiments of the present application.

[0086] In other embodiments, the end cover assembly 21 can also include the top cover 211 without the insulating piece 212, and the first through hole 31 on the top cover 211 serves as the liquid injection hole 101. The blocking piece 102 is arranged on the side of the top cover 211 close to the liquid injection space, and the blocking piece 102 and the insulating piece 212 can be two independent structures, and can be connected by means including but not limited to bonding connection, etc. The blocking piece 102 and the top cover 211 can also be an integrated structure.

[0087] The electrode assembly 23 is a component in which an electrochemical reaction occurs in the battery cell 20. One or more electrode assemblies 23 can be contained in the casing 22. The electrode assembly 23 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is usually arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials constituting a main body of the electrode assembly, and portions without active materials of the positive electrode sheet and the negative electrode sheet each constitute a tab 23a. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at two ends of the main body, respectively. In the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 23a is connected to the electrode terminal to form a current loop.

[0088] The reverse flow refers to the flow of the liquid in the first flow channel 40 from the second end 42 to the first end 41.

[0089] The first end 41 of the first flow channel 40 can be directly connected to the end cover assembly 21 to communicate with the liquid injection hole 101, that is, the opening of the first end 41 of the first flow channel 40 can directly communicate with the liquid injection hole 101. As shown in Figure 4 Exemplarily, the blocking piece 102 includes only one first flow channel 40, and the shape of the first flow channel 40 can be an L-shaped pipe, one end of the L-shaped pipe directly communicates with the liquid injection hole 101, and the other end of the L-shaped pipe directly connects the liquid injection space.

[0090] The first end 41 of the first flow channel 40 can also be indirectly connected to the end cover assembly 21. Exemplarily, as shown in Figures 15 to 17As shown, the baffle 102 may further include a confluence portion 50. The first end 41 of the first flow channel 40 can be connected through the injection hole 101 of the confluence portion 50. The confluence portion 50 is directly opposite to and connected to the injection hole 101. The first end 41 of the first flow channel 40 is directly connected to the confluence portion 50. The liquid injected into the injection hole 101 first flows into the confluence portion 50, and then flows from the confluence portion 50 into the first flow channel 40, and then flows from the second end 42 of the first flow channel 40 into the injection space. For example, the baffle 102 may include a plurality of first flow channels 40, which may be arranged at circumferential intervals along the confluence portion.

[0091] When the first end 41 of the first flow channel 40 is indirectly connected to the end cap assembly 21, the first end 41 of the first flow channel 40 is connected to the injection hole 101 and the second end 42 is connected to the injection space. This can be understood as the first end 41 of the first flow channel 40 being closer to the injection hole 101 than the second end 42.

[0092] The cross-sectional shape of the first flow channel 40 along the direction perpendicular to the liquid flow can be, but is not limited to, a circle, a rectangle, a triangle, or other polygons.

[0093] The flow restrictor 43 is provided in the first flow channel 40 so that the first flow channel 40 forms a one-way flow channel, that is, the liquid in the first flow channel 40 flows from the first end 41 to the second end 42, but cannot flow from the second end 42 to the first end 41.

[0094] In some embodiments, the flow limiting part 43 may include, but is not limited to, at least one of a check valve, a check valve, a throttle valve, etc., and the check valve, check valve, and throttle valve have the same meaning as commonly understood by those skilled in the art in the embodiments of this application.

[0095] For example, such as Figure 6 As shown, the flow limiting part 43 is a one-way valve, which can be installed in the first flow channel 40 to control the one-way flow of the fluid in the first flow channel 40.

[0096] In other embodiments, such as Figure 7 As shown, the flow-limiting part 43 and the first flow channel 40 can also together constitute the structure of a Tesla valve. The Tesla valve has the same meaning as commonly understood by those skilled in the art within the embodiments of this application. The flow-limiting part 43 and the first flow channel 40 can be two connected but different pipes in the Tesla valve, with the flow-limiting part 43 bent into a semi-loop returning to the first flow channel 40. When fluid flows forward through the Tesla valve, the fluid splits into two paths at the branch point where the first flow channel 40 and the flow-limiting part 43 form the Tesla valve, and then converges at the next branch point, achieving an acceleration effect. If the fluid flows in the reverse direction, based on the structure of the Tesla valve, the fluid will encounter significant resistance during reverse flow, thus creating a unidirectional flow effect.

[0097] In the above technical solution, the liquid injected from the injection hole 101 is injected into the first flow channel 40 and flows from the first end 41 to the second end 42 of the first flow channel 40 to flow into the liquid injection space, so that the injected liquid can be blocked by the blocking piece 102, the kinetic energy is reduced, the impact force of the injected liquid is reduced, and the probability of splashing of the liquid from the injection hole 101 is reduced. The flow limiting part 43 can block the liquid in the first flow channel 40 from flowing back to the first end 41 from the second end 42, thereby greatly reducing the risk of backflow to the first end 41 and overflow from the injection hole 101 in communication with the first end 41 due to the movement of the liquid in the first flow channel 40 in the first flow channel 40 during the transportation of the battery monomer.

[0098] Reference Figure 7 According to some embodiments of the present application, the flow limiting part 43 has a first connecting end 431 and a second connecting end 432 penetrating through the first connecting end 431 and the second connecting end 432, and the first connecting end 431 and the second connecting end 432 are in communication with the first flow channel 40, and the first connecting end 431 is closer to the first end 41 of the first flow channel 40 than the second connecting end 432, wherein the portion of the first flow channel 40 between the first connecting end 431 and the second connecting end 432 is an intermediate part, the angle between the liquid outflow direction of the first connecting end 431 and the intermediate part is an acute angle, and the angle between the liquid inflow direction of the second connecting end 432 and the intermediate part is an acute angle.

[0099] The first connecting end 431 and the second connecting end 432 of the flow limiting part 43 penetrate through, that is, the flow limiting part 43 has the shape of a pipe, so that the fluid can flow from the first connecting end 431 to the second connecting end 432 of the flow limiting part 43. The cross-sectional shape of the flow limiting part 43 can include but is not limited to a circle, a rectangle, a triangle or other polygons, and the cross-sectional shape refers to a cross section perpendicular to the liquid flow direction.

[0100] As shown in Figure 7 , the angle between the liquid outflow direction of the first connecting end 431 and the intermediate part is an acute angle, which can be that the angle A1 between the liquid outflow direction of the first connecting end 431 and the center line of the intermediate part is an acute angle. In this way, if the liquid in the first flow channel 40 flows back, the angle between the flow direction of the liquid in the first flow channel 40 through the first connecting end 431 and the liquid outflow direction of the first connecting end 431 is an obtuse angle, as shown in Figure 7 , the liquid flowing out of the first connecting end 431 generates resistance to the liquid in the first flow channel 40 through the first connecting end 431, preventing it from continuing to flow to the first end 41.

[0101] As shown in Figure 7As shown, the angle between the liquid inflow direction of the second connecting end 432 and the middle part is an acute angle. The angle A2 between the liquid inflow direction of the second connecting end 432 and the middle part can be an acute angle. In this way, if the liquid in the first flow channel 40 backflows, the angle between the flow direction of the liquid in the first flow channel 40 passing through the second connecting end 432 and the liquid inflow direction of the second connecting end 432 is an acute angle, as shown in the figure. Figure 7 As shown, the backflowing liquid in the first flow channel 40 can be divided into two parts at the second connecting end 432.

[0102] It can be understood that, in the process of transporting the battery monomer, due to the inertia of the liquid inside the battery monomer, the liquid will move relatively in the first flow channel 40, and it is possible to backflow from the second end 42 of the first flow channel 40 to the first end 41 of the first flow channel 40. In the process of the liquid flowing from the second end 42 of the first flow channel 40 to the first end 41, when the liquid passes through the second connecting end 432, due to the acute angle between the liquid inflow direction of the second connecting end 432 and the middle part, the backflowing liquid in the first flow channel 40 can smoothly flow into the second connecting end 432 and be divided into two parts at the flow limiting part 43. And due to the acute angle between the liquid outflow direction of the first connecting end 431 and the middle part, the direction of the liquid outflowing from the first connecting end 431 is opposite to the flow direction of the backflowing liquid from the second end 42 to the first end 41 in the middle part, thereby generating resistance to the backflowing liquid in the first flow channel 40, preventing the liquid in the first flow channel 40 from backflowing to the first end 41. As shown in the figure. Figure 7 As shown, when the liquid outflow direction of the first connecting end 431 and the middle part is an acute angle, the angle between the liquid outflow direction of the first connecting end 431 and the flow direction of the backflowing liquid passing through the first connecting end 431 in the middle part is an obtuse angle, that is, the flow directions are opposite, so that the liquid outflowing from the first connecting end 431 generates resistance to the liquid in the first flow channel 40, thereby hindering the liquid in the first flow channel 40 from flowing from the second end 42 to the first end 41.

[0103] In the above technical solution, by setting the flow limiting part 43, the unidirectional flow of the liquid in the first flow channel 40 is realized, and the flow rate of the liquid in the first flow channel 40 is not affected, and a high liquid injection efficiency can be maintained.

[0104] According to some embodiments of the present application, the angle A2 between the liquid inflow direction of the second connecting end 432 and the middle part is less than or equal to 30°.

[0105] Exemplarily, the angle between the liquid inflow direction of the second connecting end 432 and the middle part can be 20°-30°.

[0106] It can be understood that the smaller the angle between the inflow direction of the liquid at the second connection end 432 and the middle portion, the smaller the angle between the flow direction of the liquid at the middle portion and the flow direction of the liquid at the second connection end 432, and the more conducive to the liquid flowing from the second connection end 432 to the flow-restricting portion 43 in the first flow channel 40.

[0107] In some embodiments, the flow-restricting portion includes a straight segment, one end of the straight segment serving as the second connection end, and the angle between the center line of the straight segment and the center line of the middle portion of the first flow channel 40 can be less than or equal to 30°, so that the angle between the inflow direction of the liquid at the second connection end and the middle portion is less than or equal to 30°.

[0108] In other embodiments, the flow-restricting portion includes a curved segment, one end of the curved segment serving as the second connection end, and the angle between the inside tangent line of the second connection end and the center line of the middle portion of the first flow channel 40 can be less than or equal to 30°, so that the angle between the inflow direction of the liquid at the second connection end and the middle portion is less than or equal to 30°.

[0109] Within the above range, it is conducive to the liquid flowing from the second connection end 432 to the flow-restricting portion 43 in the first flow channel 40, so that the liquid can flow out from the first connection end 431 in the flow-restricting portion 43 to hinder the liquid in the first flow channel 40 from flowing back to the first end 41.

[0110] Reference Figure 7 , according to some embodiments of the present application, the flow-restricting portion 43 includes a first segment 433 and a second segment 434 connected and communicated with each other, one end of the first segment 433 away from the second segment 434 serving as the first connection end 431, and one end of the second segment 434 away from the first segment 433 serving as the second connection end 432, the first segment 433 being a curved segment, and the second segment 434 being a straight segment.

[0111] The first segment 433 being a curved segment means that the first segment 433 has a curved shape, and the shape of the first segment 433 can include but is not limited to an arc shape, an S shape, or other shapes, etc. The second segment 434 being a straight segment means that the second segment 434 extends along a straight line.

[0112] As shown in Figure 7 , the first segment 433 is a curved segment, the angle A3 between the inside tangent line of one end of the first segment 433 away from the second segment 434 and the center line of the middle portion is an obtuse angle, the second segment 434 is a straight segment, and the angle A4 between the center line of the second segment 434 and the center line of the middle portion is an acute angle, and the angle between the center line of the second segment 434 and the center line of the middle portion can be less than or equal to 30°.

[0113] The first section 433 is a curved section, which can make the angle between the outflow direction of the liquid at the first connecting end 431 and the middle part be an acute angle, and will not cause great obstruction to the flow of the liquid in the flow limiting part 43, so that the liquid can smoothly pass through the flow limiting part 43. The second section 434 is a straight section, which is beneficial to the liquid flowing reversely in the first flow channel 40 to smoothly flow into the first flow channel 40 from the second connecting end 432, so that the first connecting end 431 has liquid flowing out to hinder the reverse flow of the liquid in the first flow channel 40 to the first end 41.

[0114] It can be understood that, in order to facilitate the description of the shape of the flow limiting part 43, the flow limiting part 43 is divided into the first section 433 and the second section 434 according to the different shapes of different parts of the flow limiting part 43, which does not mean that the first section 433 and the second section 434 are two independent parts. In fact, the first section 433 and the second section 434 can be an integral structure.

[0115] In the above technical solution, while achieving the function of the flow limiting part 43 to limit the flow of the liquid in the first flow channel 40 from the second end 42 to the first end 41, the structure of the flow limiting part 43 itself is reduced to hinder the flow of the liquid in it from the first connecting end 431 to the second connecting end 432, and a high liquid injection efficiency is maintained.

[0116] It can be understood that, in other embodiments, the first section 433 is not limited to a straight section, and the second section 434 is not limited to a curved section, as long as the tangential angle between the first connecting end 431 and the middle part is obtuse, and the tangential angle between the second connecting end 432 and the middle part is acute.

[0117] According to some embodiments of the present application, the inner diameter of the flow limiting part 43 is greater than or equal to the inner diameter of the first flow channel 40.

[0118] In other words, the cross-sectional area of the flow limiting part 43 is greater than or equal to the cross-sectional area of the first flow channel 40, and the cross section here refers to the cross section of the flow limiting part 43 or the first flow channel 40 in the direction perpendicular to the flow direction of the liquid.

[0119] In the case where the cross-sectional shape of the flow limiting part 43 or the first flow channel 40 is circular, the inner diameter refers to the inner diameter. In the case where the cross-sectional shape of the flow limiting part 43 or the first flow channel 40 is other than circular, the inner diameter can be the equivalent diameter of the first flow channel, which refers to the diameter of a circular pipe with the same hydraulic radius.

[0120] For example, the ratio of the inner diameter of the flow limiting part 43 to the inner diameter of the first flow channel 40 can be 1.2-1.6, for example, 1.5.

[0121] The inner diameter of the flow-restricting portion 43 at any position can be the same, and the inner diameter of the first flow channel 40 at any position can be the same.

[0122] In the case where the inner diameter of the flow-restricting portion 43 is greater than or equal to the inner diameter of the first flow channel 40, the cross-sectional area of the flow-restricting portion 43 is greater than or equal to the cross-sectional area of the first flow channel 40, so that the flow rate of the liquid flowing in from the second connecting end 432 of the flow-restricting portion 43 is relatively large, thereby causing the flow rate of the liquid flowing out from the first connecting end 431 of the flow-restricting portion 43 to also be relatively large, and the flow rate is not less than the flow rate of the liquid passing through the first connecting end 431 in the first flow channel 40, so that when the liquid in the first flow channel 40 backflows, the liquid flowing out from the first connecting end 431 can generate a large enough resistance to the liquid in the first flow channel 40 to block the backflow of the liquid in the first flow channel 40 to the first end 41.

[0123] In the above technical solution, by setting the inner diameter of the flow-restricting portion 43 to be greater than or equal to the inner diameter of the first flow channel 40, the liquid flowing out from the first connecting end 431 of the flow-restricting portion 43 can generate a large enough resistance to prevent the liquid in the first flow channel 40 from flowing to the first end 41, thereby improving the success rate of the flow-restricting portion 43 in restricting the liquid in the first flow channel 40 from flowing from the second end 42 to the first end 41.

[0124] According to some embodiments of the present application, the flow-restricting portion 43 arranged in the first flow channel 40 is a plurality of flow-restricting portions.

[0125] In the case where the flow-restricting portion 43 is arranged in the first flow channel 40, the plurality of flow-restricting portions 43 can be arranged in the extension direction of the first flow channel 40. For example, in the case where the flow-restricting portion 43 is a one-way valve, a plurality of one-way valves are arranged in the first flow channel 40 in sequence, so that the liquid flowing in from the first end 41 of the first flow channel 40 can pass through the plurality of one-way valves in sequence. If the liquid in the first flow channel 40 backflows from the second end 42 to the first end 41, the backflow of the liquid in the first flow channel 40 can be restricted due to the plurality of one-way valves. Even if a small part of the backflowing liquid can pass through the front one-way valve, the rear one-way valve can continue to block the backflowing liquid, thereby greatly improving the success rate of restricting the liquid in the first flow channel 40 from backflowing from the second end 42 to the first end 41.

[0126] In the case where the flow-restricting portion 43 includes the first connecting end 431 and the second connecting end 432, and the first connecting end 431 and the second connecting end 432 are both tangentially communicated with the same side of the first flow channel 40 in the first direction, the plurality of flow-restricting portions 43 can be arranged on the same side of the first flow channel 40, or can be arranged on opposite sides of the first flow channel 40.

[0127] The technical solution can enhance the effect of limiting the flow of liquid in the first flow channel 40 from the second end 42 to the first end 41, and further improve the problem of liquid overflow of the liquid injection hole 101.

[0128] As shown in Figure 8 According to some embodiments of the present application, the first flow channel 40 is provided with a plurality of flow limiting portions 43, which are arranged on the same side of the first flow channel 40 in the first direction X perpendicular to the extension direction of the first flow channel 40.

[0129] Each flow limiting portion 43 has a first connecting end 431 and a second connecting end 432, and the first connecting end 431 and the second connecting end 432 are both communicated with the same side of the first flow channel 40 in the first direction X.

[0130] The technical solution can enhance the effect of limiting the flow of liquid in the first flow channel 40 from the second end 42 to the first end 41, and further improve the problem of liquid overflow of the liquid injection hole 101.

[0131] As shown in Figures 9 to 13 According to some embodiments of the present application, the first flow channel 40 is provided with a plurality of flow limiting portions 43, which are arranged on the same side of the first flow channel 40 in the first direction X perpendicular to the extension direction of the first flow channel 40.

[0132] Each flow limiting portion 43 has a first connecting end 431 and a second connecting end 432, and the first connecting end 431 and the second connecting end 432 are both communicated with the same side of the first flow channel 40 in the first direction X.

[0133] As shown in Figure 9 Two flow limiting portions 43 are arranged on opposite sides of the first flow channel 40, and in the case that the liquid in the first flow channel 40 flows from the first end 41 to the second end 42, the liquid is divided from the first connecting end 431 of the flow limiting portion 43 when passing through the first connecting end 431 of the flow limiting portion 43, and enters the flow limiting portion 43, and the liquid flowing out of the second connecting end 432 is combined with the liquid in the first flow channel 40.

[0134] As shown in Figure 10As shown, when the liquid in the first flow channel 40 flows in the reverse direction from the second end 42 to the first end 41, when the liquid passes through the second connecting end 432 of the flow-limiting part 43, it is diverted from the second connecting end 432 into the flow-limiting part 43. When it flows out from the first connecting end 431, the flow direction of the liquid flowing out from the first connecting end 431 forms an obtuse angle with the flow direction of the liquid in the first flow channel 40, thus hindering the continued flow of the liquid in the first flow channel 40 from one side. If the first flow-limiting part 43 fails to completely prevent the liquid in the first flow channel 40 from continuing to flow to the first end 41, the continuing liquid will be diverted into the second flow-limiting part 43 when it passes through the second connecting end 432 of the second flow-limiting part 43. The liquid flowing out from the first connecting end 431 of the second flow-limiting part 43 will then hinder the continued flow of the liquid in the first flow channel 40 to the first end 41 from the other side of the first flow channel 40.

[0135] The embodiments of this application do not specifically limit the arrangement of multiple flow limiting parts 43 on opposite sides of the first flow channel 40.

[0136] In some embodiments, a plurality of flow-limiting portions 43 may be evenly distributed on opposite sides of the first flow channel 40, that is, the number of flow-limiting portions 43 disposed on both sides of the first flow channel 40 is the same.

[0137] In other embodiments, the number of flow-limiting portions 43 on both sides of the first flow channel 40 may also be different.

[0138] like Figures 9 to 11 As shown, in some embodiments, at least two flow-limiting portions 43 located on both sides of the first flow channel 40 may be staggered in the extension direction of the first flow channel 40, that is, the two staggered flow-limiting portions 43 located on both sides of the first flow channel 40 are not directly opposite each other in the first direction X.

[0139] like Figure 12 As shown, in some other embodiments, at least two flow-limiting portions 43 located on both sides of the first flow channel 40 may also be symmetrically arranged with the center line of the first flow channel 40 as the center of symmetry. That is, the two flow-limiting portions 43 located on both sides of the first flow channel 40 completely overlap on the projection plane perpendicular to the first direction X. In this way, the liquid flowing out of the first connection end 431 of the two flow-limiting portions 43 can generate resistance to the flow of liquid at the same point in the first flow channel 40, thereby increasing the success rate of restricting the backflow of liquid in the first flow channel 40 from the second end 42 to the first end 41.

[0140] In the above technical solution, when the flow limiting part 43 is tangentially connected to the same side of the first flow channel 40, the flow limiting parts 43 arranged on opposite sides of the first flow channel 40 can also intercept the liquid flowing towards the first end 41 in the first flow channel 40 from different sides of the first flow channel 40, thereby improving the success rate of limiting the liquid in the first flow channel 40 to flow back from the second end 42 to the first end 41.

[0141] As shown in Figures 9 to 11 , according to some embodiments of the present application, the flow-restricting portions 43 located on opposite sides of the first flow channel 40 are staggered along the extension direction of the first flow channel 40.

[0142] The staggering can be that the two flow-restricting portions 43 located on opposite sides of the first flow channel 40 are partially staggered along the extension direction of the first flow channel 40, in other words, the two flow-restricting portions 43 located on opposite sides of the first flow channel 40 are partially staggered in the orthographic projection on the projection plane perpendicular to the first direction X, as shown in Figure 11 .

[0143] The staggering can also be that the two flow-restricting portions 43 located on opposite sides of the first flow channel 40 are completely staggered along the extension direction of the first flow channel 40, in other words, the two flow-restricting portions 43 located on opposite sides of the first flow channel 40 are completely staggered in the orthographic projection on the projection plane perpendicular to the first direction X, as shown in Figure 9 and Figure 10 .

[0144] As shown in Figure 13 , in some embodiments, the gap between the two adjacent flow-restricting portions 43 located on one side of the first flow channel 40 can be directly opposite one flow-restricting portion 43 located on the other side of the first flow channel 40.

[0145] In other embodiments, the gap between the two adjacent flow-restricting portions 43 located on one side of the first flow channel 40 can also be directly opposite multiple flow-restricting portions 43 located on the other side of the first flow channel 40.

[0146] In the above technical solutions, the flow-restricting portions 43 located on opposite sides of the first flow channel 40 are arranged corresponding to different positions of the first flow channel 40, so that the resistance to the liquid flowing from the second end 42 to the first end 41 in the first flow channel 40 can be generated at different positions of the first flow channel 40, further improving the success rate of restricting the backflow of the liquid in the first flow channel 40 from the second end 42 to the first end 41.

[0147] Referring to Figure 9 , Figure 10 and Figure 13 , according to some embodiments of the present application, the two flow-restricting portions 43 located on opposite sides of the first flow channel 40 are spaced apart in the orthographic projection on the projection plane perpendicular to the first direction X.

[0148] That is, the two flow-restricting portions 43 located on opposite sides of the first flow channel 40 are completely staggered, so that the distance between the two adjacent flow-restricting portions 43 is large.

[0149] Exemplarily, the number of the flow-limiting portions 43 can be two, and the two flow-limiting portions 43 are respectively arranged at opposite sides of the first flow channel 40 and completely staggered.

[0150] In the above technical solution, the multiple flow-limiting portions 43 are arranged relatively dispersedly in the extension direction of the first flow channel 40, so that the multiple flow-limiting portions 43 can take into account the flow limitation of the liquid in the entire first flow channel 40, to further limit the success rate of the liquid in the entire first flow channel 40 flowing back from the second end 42 to the first end 41.

[0151] Reference Figure 14 And Figure 15 According to some embodiments of the present application, the number of the first flow channels 40 is multiple, and the blocking piece 102 further comprises: a converging portion 50 opposite and communicating with the liquid injection hole 101, the first end 41 of the first flow channel 40 is connected with the converging portion 50 and communicates with the liquid injection hole 101 through the converging portion 50; wherein the multiple first flow channels 40 are arranged along the circumferential direction of the converging portion 50, so that the liquid injected from the liquid injection hole 101 into the converging portion 50 flows into the liquid injection space along the multiple first flow channels 40.

[0152] Each first flow channel 40 is provided with a flow-limiting portion 43, so that each first flow channel 40 forms a one-way flow channel.

[0153] Since the converging portion 50 is opposite and communicates with the liquid injection hole 101, the liquid injected by the liquid injection hole 101 first flows into the converging portion 50, and then flows from the converging portion 50 into the multiple first flow channels 40 communicating with the converging portion 50.

[0154] In some embodiments, the orthographic projection of the liquid injection hole 101 on the projection plane perpendicular to the penetration direction of the liquid injection hole 101 at least partially overlaps with the orthographic projection of the opening of the converging portion 50 close to the liquid injection hole on the projection plane perpendicular to the penetration direction of the liquid injection hole 101.

[0155] Exemplarily, the orthographic projection of the liquid injection hole 101 on the projection plane perpendicular to the penetration direction of the liquid injection hole 101 can completely overlap with the orthographic projection of the opening of the converging portion 50 close to the liquid injection hole on the projection plane perpendicular to the penetration direction of the liquid injection hole 101. That is, the opening size of the liquid injection hole 101 close to the liquid injection hole 101 can be the same as the opening size of the liquid injection hole 101.

[0156] Exemplarily, the orthographic projection of the liquid injection hole 101 on the projection plane perpendicular to the penetration direction of the liquid injection hole 101 can also be located within the orthographic projection of the opening of the converging portion 50 close to the liquid injection hole on the projection plane perpendicular to the penetration direction of the liquid injection hole 101. That is, the opening size of the liquid injection hole 101 close to the liquid injection hole 101 is greater than the opening size of the liquid injection hole 101.

[0157] In some embodiments, the number of the first flow channels 40 can be four, and the included angle between the center lines of two adjacent first flow channels 40 is 90°. Assuming that the extension direction of one of the first flow channels 40 is the second direction, the extension directions of the two first flow channels 40 adjacent to the first flow channel 40 extending in the second direction are the third direction, and the third direction is perpendicular to the second direction, and the extension direction of the remaining one of the first flow channels 40 is the second direction. Among them, the two first flow channels 40 extending in the second direction are mutually through in the second direction, and the two first flow channels 40 extending in the third direction are mutually through in the third direction.

[0158] In some embodiments, the second direction can be perpendicular to the through direction of the liquid injection hole 101, and the through direction of the liquid injection hole 101 can be the height direction of the shell 22.

[0159] In other embodiments, the number of the first flow channels 40 can also be two, three, five or more.

[0160] In the above technical solution, the liquid injection efficiency can be improved. In the process of transporting the battery monomer, the liquid in the shell 22 can pass through the baffle 102 in multiple directions through the plurality of first flow channels 40, which is beneficial to reduce the phenomenon that the electrolyte is blocked by the side wall and splashes out of the liquid injection hole 101. And because the flow limiting part 43 is arranged in each first flow channel 40, the risk that the liquid in the plurality of first flow channels 40 flows back to the first end 41 from the second end 42 and then gathers in the confluence part 50, resulting in too much liquid in the confluence part 50 and overflowing from the liquid injection hole 101, can be greatly reduced.

[0161] Reference Figures 16 to 20 According to some embodiments of the present application, the baffle 102 further comprises: a confluence part 50, the confluence part 50 is opposite and communicates with the liquid injection hole 101, the first end 41 of the first flow channel 40 is connected with the confluence part 50, and the confluence part 50 communicates with the liquid injection hole 101; at least one second flow channel 60, the first end 41 of the second flow channel 60 communicates with the confluence part 50, the second end 42 of the second flow channel 60 communicates with the liquid injection space, and the extension direction of the second flow channel 60 intersects with the through direction of the liquid injection hole 101; wherein, the at least one first flow channel 40 and the at least one second flow channel 60 are arranged in the circumferential direction of the confluence part 50, so that the liquid injected from the liquid injection hole 101 into the confluence part 50 flows into the liquid injection space along the first flow channel 40 and the second flow channel 60.

[0162] It is worth noting that, in order to reflect the positional relationship between the baffle and the liquid injection hole, Figure 16 In the above technical solution, the liquid injection efficiency can be improved. In the process of transporting the battery monomer, the liquid in the shell 22 can pass through the baffle 102 in multiple directions through the plurality of first flow channels 40, which is beneficial to reduce the phenomenon that the electrolyte is blocked by the side wall and splashes out of the liquid injection hole 101. And because the flow limiting part 43 is arranged in each first flow channel 40, the risk that the liquid in the plurality of first flow channels 40 flows back to the first end 41 from the second end 42 and then gathers in the confluence part 50, resulting in too much liquid in the confluence part 50 and overflowing from the liquid injection hole 101, can be greatly reduced.

[0163] Each first flow channel 40 is provided with a flow limiting portion 43, so that each first flow channel 40 forms a one-way flow channel. No flow limiting portion is provided in the second flow channel 60, so that liquid can flow from the first end 41 to the second end 42 of the second flow channel 60, and also from the second end 42 to the first end 41 of the second flow channel 60.

[0164] In some embodiments, the number of first flow channels 40 and the number of second flow channels 60 can each be one, the first flow channel 40 and the second flow channel 60 can each extend in the same direction, and the first flow channel 40 and the second flow channel 60 can be through each other.

[0165] In other embodiments, the number of first flow channels 40 can be one, and the number of second flow channels 60 can be multiple. Exemplarily, as shown in FIG. 1, the number of second flow channels 60 can be three, wherein the first flow channel 40 extends in the second direction, the two second flow channels 60 adjacent to the first flow channel 40 extend in the third direction, and the remaining one second flow channel 60 extends in the second direction. The second direction is perpendicular to the third direction. Figure 18

[0166] The first flow channel 40 and the second flow channel 60 extending in the second direction are through each other, and the two first flow channels 40 extending in the third direction are through each other.

[0167] In yet other embodiments, the number of first flow channels 40 can be multiple, and the number of second flow channels 60 can be one. Exemplarily, as shown in FIG. 2, the number of first flow channels 40 can be three. Wherein the second flow channel 60 extends in the second direction, the two first flow channels 40 adjacent to the second flow channel 60 extend in the third direction, and the remaining one first flow channel 40 extends in the second direction. The first flow channel 40 and the second flow channel 60 extending in the second direction are through each other, and the two first flow channels 40 extending in the third direction are through each other. Figure 19 In still other embodiments, the number of first flow channels 40 and the number of second flow channels 60 can each be multiple. The multiple first flow channels 40 and the multiple second flow channels 60 can be alternately arranged along the circumferential direction of the flow converging portion 50, or among the multiple first flow channels 40 and the multiple second flow channels 60 arranged at intervals along the circumferential direction of the flow converging portion 50, the multiple first flow channels 40 are arranged adjacent to each other at intervals, and the multiple second flow channels 60 are arranged adjacent to each other at intervals.

[0168] Exemplarily, as shown in FIG. 3, the number of first flow channels 40 and the number of second flow channels 60 can each be three. The three first flow channels 40 and the three second flow channels 60 are alternately arranged along the circumferential direction of the flow converging portion 50.

[0169] Figure 20 ​​As shown, there can be two first flow channels 40 and two second flow channels 60. One of the two first flow channels 40 extends along a second direction, and the other extends along a third direction. Similarly, one of the two second flow channels 60 extends along a second direction, and the other extends along a third direction. The first flow channel 40 and the second flow channel 60 extending along the second direction can be interconnected, and the first flow channel 40 and the second flow channel 60 extending along the third direction can also be interconnected.

[0170] In the above technical solution, since the second flow channel 60 does not have a flow-limiting part 43, the flow of liquid in the second flow channel 60 is unrestricted, greatly improving the injection efficiency. Meanwhile, the first flow channel 40, by having a flow-limiting part 43 to restrict the backflow of liquid to the second end 42, can reduce the amount of liquid flowing back to the confluence part 50 as a whole, thereby reducing the phenomenon of liquid overflowing from the injection hole 101 to a certain extent.

[0171] According to some embodiments of this application, the injection hole 101 penetrates the end cap assembly 21 along the height direction of the housing 22, and the extension direction of the first flow channel 40 is perpendicular to the penetration direction of the injection hole 101.

[0172] During the transfer of battery cells, the movement direction of the battery cells is usually perpendicular to the height direction of the housing 22, so that the movement direction of the liquid inside the housing 22 relative to the baffle 102 is also perpendicular or nearly perpendicular to the height direction of the housing 22. The extension direction of the first flow channel 40 is perpendicular to the penetration direction of the injection hole 101. That is, the extension direction of the first flow channel 40 can be parallel or nearly parallel to the movement direction of the liquid inside the housing 22, which facilitates the smooth passage of liquid through the first flow channel 40 and reduces the risk of liquid overflowing from the injection hole 101.

[0173] In some embodiments, the baffle 102 further includes a second flow channel 60, the extension direction of which is also perpendicular to the through direction of the injection hole 101.

[0174] In the above technical solution, the extension direction of the first flow channel 40 is perpendicular to the penetration direction of the injection hole 101, which helps to reduce the impact between the liquid and the baffle 102 during the transfer of the battery cell, so that the liquid can pass smoothly through the first flow channel 40 and the baffle 102, which helps to reduce the phenomenon of liquid splashing out of the injection hole 101 due to being blocked by the baffle 102.

[0175] refer to Figure 17 According to some embodiments of this application, the baffle 102 includes a bottom wall 70 and a side wall, the side wall connecting the bottom wall 70 and the end cap assembly 21 to collectively form at least one first flow channel 40.

[0176] The sidewall and end cap assembly 21 can be connected by adhesive bonding, or the sidewall and end cap assembly 21 can be an integral structure.

[0177] The bottom wall 70 is disposed opposite to the end cap assembly 21. Exemplarily, the surface of the bottom wall 70 near the end cap assembly 21 and the surface of the end cap assembly 21 near the bottom wall 70 can be parallel to each other. The bottom wall 70 is also aligned with the injection hole 101 so that the bottom wall 70 can block the liquid injected into the injection hole 101, preventing the liquid injected into the injection hole 101 from directly entering the injection space and thus causing excessive impact force on the electrode assembly.

[0178] The sidewall can be set perpendicular to the bottom wall 70, that is, the sidewall can be set parallel to the through direction of the injection hole 101.

[0179] In some embodiments, the baffle 102 includes a plurality of first flow channels 40 and a confluence portion 50. The sidewall may include a plurality of first wall portions, which are arranged circumferentially along the injection hole 101 and are all connected to the end cap assembly 21 to form a plurality of first flow channels 40 with the bottom wall 70 and the end cap assembly 21. The confluence of the plurality of first flow channels 40 serves as the confluence portion 50.

[0180] In other embodiments, the baffle 102 further includes at least one second flow channel 60 and a confluence portion 50. The sidewall may include a plurality of first wall portions 71 and a plurality of second wall portions 72, arranged circumferentially along the injection hole 101 and all connected to the end cap assembly 21. The plurality of first wall portions 71, together with the bottom wall 70 and the end cap assembly 21, form at least one first flow channel 40, and the plurality of second wall portions 72, together with the bottom wall 70 and the end cap assembly 21, form at least one second flow channel 60. The intersection of the at least one first flow channel 40 and the at least one second flow channel 60 serves as the confluence portion 50.

[0181] In some embodiments, at least one first wall portion 71 forming the first flow channel 40 is provided with a first opening and a second opening communicating with the first flow channel 40. The sidewall also includes at least two third wall portions 73 connected to the first wall portions 71. The third wall portions 73 are connected to the end cap assembly 21 and the bottom wall 70 to form a flow restriction portion 43 together with the end cap assembly 21 and the bottom wall 70. The two ends of the flow restriction portion 43 are respectively connected to the first opening and the second opening.

[0182] In the above technical solution, the sidewall connects the bottom wall 70 and the end cap assembly 21. On the one hand, this helps to improve the stability of the installation of the baffle 102 and the end cap assembly 21, and also facilitates the processing of the baffle 102. On the other hand, it enables the sidewall to effectively block the liquid injected through the self-injection hole 101, reducing the probability of the liquid injected through the self-injection hole 101 splashing out from the gap between the sidewall and the end cap assembly 21.

[0183] This application provides a battery that includes the battery cell described in the above embodiments.

[0184] The structure of the battery can be referred to the relevant description in the above embodiments, and will not be repeated here.

[0185] The battery has the beneficial effects of the battery cell provided in the embodiments of this application. For details, please refer to the specific description of the battery cell in the above embodiments, which will not be repeated here.

[0186] This application provides an electrical device that includes the battery described in the above embodiments, the battery being used to provide electrical energy.

[0187] The electrical devices can be referred to the relevant descriptions in the above embodiments, and will not be repeated here.

[0188] The electrical device has the beneficial effects of the battery cell provided in the embodiments of this application. For details, please refer to the specific description of the battery cell in the above embodiments, which will not be repeated here.

[0189] This application provides a single battery cell, as referenced in the embodiments. Figure 4 , Figure 5 as well as Figure 7 The battery cell includes: a housing 22; an end cap assembly 21 for forming an injection space with the housing 22, the end cap assembly 21 having an injection hole 101 communicating with the injection space; and a baffle 102 disposed on the side of the end cap assembly 21 near the injection space, the baffle 102 including a bottom wall 70 and a side wall, the side wall connecting the bottom wall 70 and the end cap assembly 21 to jointly form at least one first flow channel 40, the first end 41 of the first flow channel 40 communicating with the injection hole 101, the second end 42 of the first flow channel 40 communicating with the injection space, the extension direction of the first flow channel 40 being perpendicular to the penetration direction of the injection hole 101, and the baffle 102 further including: a flow limiting part 43 disposed in the first flow channel 40 for limiting the reverse flow of liquid in the first flow channel 40 to the first end 41.

[0190] refer to Figure 7 The flow-limiting section 43 has a through first connecting end 431 and a second connecting end 432. Both the first connecting end 431 and the second connecting end 432 are connected to the same side of the first flow channel 40 in a first direction X, which is perpendicular to the extension direction of the first flow channel 40. The first connecting end 431 is located closer to the first end 41 of the first flow channel 40 than the second connecting end 432. The portion of the first flow channel 40 located between the first connecting end 431 and the second connecting end 432 is the middle portion. The angle between the liquid outflow direction of the first connecting end 431 and the middle portion is an acute angle, and the angle between the liquid inflow direction of the second connecting end 432 and the middle portion is also an acute angle.

[0191] The flow-limiting section 43 includes a first segment 433 and a second segment 434 that are connected and interconnected. The end of the first segment 433 away from the second segment 434 serves as a first connecting end 431, and the end of the second segment 434 away from the first segment 433 serves as a second connecting end 432. The first segment 433 is a curved segment, and the second segment 434 is a straight segment. The angle between the inner tangent of the end of the first segment 433 away from the second segment 434 and the center line of the middle section is an obtuse angle. The second segment 434 is a straight segment, and the angle between the center line of the second segment 434 and the center line of the middle section is an acute angle. For example, the angle between the center line of the second segment 434 and the center line of the middle section can be less than or equal to 30°.

[0192] The inner diameter of the flow restrictor 43 is greater than or equal to the inner diameter of the first flow channel 40.

[0193] The first flow channel 40 is provided with multiple flow-limiting sections 43, see reference. Figure 8 Multiple flow restrictors 43 can be spaced apart on the same side of the first flow channel 40, for reference. Figures 9 to 13 They can also be arranged on opposite sides of the first flow channel 40. The flow limiting parts 43 located on opposite sides of the first flow channel 40 can be staggered or symmetrically arranged along the extension direction of the first flow channel 40.

[0194] refer to Figure 14 For example, the number of first flow channels 40 is multiple, and the baffle 102 further includes a confluence portion 50, which is directly opposite to and communicates with the injection hole 101. The first end 41 of the first flow channel 40 is connected to the confluence portion 50 and communicates with the injection hole 101 through the confluence portion 50. The multiple first flow channels 40 are arranged at intervals along the circumference of the confluence portion 50, so that the liquid injected from the injection hole 101 into the confluence portion 50 flows into the injection space along the multiple first flow channels 40. The sidewall may include multiple first wall portions, which are arranged along the circumference of the injection hole 101 and are all connected to the end cap assembly 21 to form multiple first flow channels 40 together with the bottom wall and the end cap assembly 21. The intersection of the multiple first flow channels 40 serves as the confluence portion 50.

[0195] refer to Figures 17 to 20For example, the baffle 102 further includes at least one second flow channel 60. The first end 41 of the second flow channel 60 communicates with the manifold 50, and the second end 42 of the second flow channel 60 communicates with the injection space. The extending direction of the second flow channel 60 intersects the through direction of the injection hole 101. At least one first flow channel 40 and at least one second flow channel 60 are arranged circumferentially at intervals along the manifold 50, so that liquid injected from the injection hole 101 into the manifold 50 flows into the injection space along the first flow channel 40 and the second flow channel 60. The sidewall may include a plurality of first wall portions 71 and a plurality of second wall portions 72, which are arranged circumferentially along the injection hole 101 and are all connected to the end cap assembly 21. A plurality of first wall portions 71, together with the bottom wall 70 and the end cap assembly 21, form at least one first flow channel 40, and a plurality of second wall portions 72, together with the bottom wall 70 and the end cap assembly 21, form at least one second flow channel 60, and the junction of at least one first flow channel 40 and at least one second flow channel 60 serves as a confluence portion 50.

[0196] At least one first wall portion 71 forming the first flow channel 40 is provided with a first opening and a second opening communicating with the first flow channel 40. The sidewall also includes at least two third wall portions 73 connected to the first wall portions 71. The third wall portions 73 are connected to the end cap assembly 21 and the bottom wall 70, so as to form a flow limiting portion 43 together with the end cap assembly 21 and the bottom wall 70. The two ends of the flow limiting portion 43 are respectively connected to the first opening and the second opening.

[0197] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: case; An end cap assembly is used to form a liquid injection space with the housing, and the end cap assembly is provided with a liquid injection hole communicating with the liquid injection space; A baffle is disposed on the side of the end cap assembly near the injection space. The baffle includes at least one first flow channel, a first end of which communicates with the injection hole, and a second end of which communicates with the injection space. The extending direction of the first flow channel intersects the through direction of the injection hole. The baffle further includes: A flow restrictor is disposed in the first flow channel to restrict the reverse flow of liquid in the first flow channel to the first end.

2. The battery cell according to claim 1, characterized in that, The flow-limiting section has a through first connecting end and a second connecting end, both of which are connected to the first flow channel. The first connecting end is positioned closer to the first end of the first flow channel than the second connecting end. The portion of the first flow channel located between the first connecting end and the second connecting end is the middle section. The angle between the liquid outflow direction of the first connecting end and the middle section is an acute angle, and the angle between the liquid inflow direction of the second connecting end and the middle section is an acute angle.

3. The battery cell according to claim 2, characterized in that, The angle between the liquid inflow direction at the second connection end and the middle part is less than or equal to 30°.

4. The battery cell according to claim 2 or 3, characterized in that, The flow-limiting section includes a first segment and a second segment that are connected and interconnected. The end of the first segment away from the second segment serves as the first connecting end, and the end of the second segment away from the first segment serves as the second connecting end. The first segment is a curved segment, and the second segment is a straight segment.

5. The battery cell according to any one of claims 2-4, characterized in that, The inner diameter of the flow restrictor is greater than or equal to the inner diameter of the first flow channel.

6. The battery cell according to any one of claims 1-5, characterized in that, The flow-limiting part disposed in the first flow channel is a plurality of parts.

7. The battery cell according to any one of claims 2-5, characterized in that, The first flow channel is provided with a plurality of flow limiting parts, which are spaced apart on the same side of the first flow channel in a first direction, the first direction being perpendicular to the extension direction of the first flow channel.

8. The battery cell according to any one of claims 2-5, characterized in that, The first flow channel is provided with a plurality of flow limiting parts, which are arranged on opposite sides of the first flow channel in a first direction, the first direction being perpendicular to the extension direction of the first flow channel.

9. The battery cell according to claim 8, characterized in that, The flow-limiting portions located on opposite sides of the first flow channel are staggered along the extension direction of the first flow channel.

10. The battery cell according to claim 9, characterized in that, Two flow-limiting sections located on opposite sides of the first flow channel are spaced apart by orthogonal projection on a projection plane perpendicular to the first direction.

11. The battery cell according to any one of claims 1-10, characterized in that, The number of the first flow channels is multiple, and the baffle further includes: A manifold is provided, which is directly opposite to and communicates with the injection hole. The first end of the first flow channel is connected to the manifold and communicates with the injection hole through the manifold. Multiple first flow channels are arranged at circumferential intervals along the confluence portion, such that liquid injected into the confluence portion from the injection hole flows into the injection space along the multiple first flow channels.

12. The battery cell according to any one of claims 1-10, characterized in that, The stop also includes: A manifold is provided, which is directly opposite to and connected to the injection hole. The first end of the first flow channel is connected to the manifold and is connected to the injection hole through the manifold. At least one second flow channel, a first end of which communicates with the manifold, a second end of which communicates with the injection space, and the extending direction of the second flow channel intersects the through direction of the injection hole; wherein, At least one first flow channel and at least one second flow channel are arranged circumferentially at intervals along the manifold, such that liquid injected into the manifold from the injection hole flows into the injection space along the first flow channel and the second flow channel.

13. The battery cell according to any one of claims 1-12, characterized in that, The injection hole extends through the end cap assembly along the height direction of the housing, and the extension direction of the first flow channel is perpendicular to the penetration direction of the injection hole.

14. The battery cell according to any one of claims 1-13, characterized in that, The baffle includes a bottom wall and a side wall, the side wall connecting the bottom wall and the end cap assembly to together form at least one first flow channel.

15. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-14.

16. An electrical appliance, characterized in that, Includes the battery as described in claim 15.

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