CN218586303U - Battery cell, battery and power consumption device - Google Patents

Abstract

The application relates to a battery cell, a battery and an electric device. The battery cell comprises a shell, electrolyte, an electrode assembly and an end cover assembly; at least one end of the shell is provided with an opening, and the plane of the opening is parallel to the height direction of the battery monomer; the electrolyte is contained in the shell; the electrode assembly is accommodated in the case; the end cap assembly includes an end cap for covering the opening to seal the case, and an insulating member located between the end cap and the electrode assembly, the insulating member including a liquid guiding structure extending at least partially in a height direction to guide the electrolyte in the height direction. The performance of the battery cell can be improved.

Description

Battery cell, battery and power consumption device

Technical Field

The present application relates to the field of battery technologies, and in particular, to a battery cell, a battery, and an electric device.

Background

The rechargeable battery has the advantages of small volume, high energy density, high safety, small self-discharge, long service life and the like, and is widely applied to multiple fields of energy storage, communication, electric automobiles, aerospace and the like. The battery comprises a plurality of battery cells connected in series, parallel or series-parallel.

With the expansion of the application range of the battery cell, the performance requirements of the battery cell are gradually increased, and especially the cycle performance and safety performance of the battery cell still need to be improved.

SUMMERY OF THE UTILITY MODEL

The application provides a battery cell, a battery and an electric device, aiming at improving the cycle performance and the safety performance of the battery cell and the like.

In one aspect, a battery cell is provided according to an embodiment of the present application, the battery cell including a case, an electrolyte, an electrode assembly, and an end cap assembly; at least one end of the shell is provided with an opening, and the plane of the opening is parallel to the height direction of the battery monomer; the electrolyte is contained in the shell; the electrode assembly is accommodated in the case; the end cap assembly includes an end cap for covering the opening to seal the case, and an insulating member located between the end cap and the electrode assembly, the insulating member including a liquid guiding structure extending at least partially in a height direction to guide the electrolyte in the height direction.

Therefore, the insulating member is arranged and comprises the liquid guide structure, the insulating member can insulate and separate the end cover and the electrode assembly, and safety performance is improved; the liquid guide structure at least partially extends along the height direction, and through the liquid absorption effect of the liquid guide structure, electrolyte at a low position can flow to a high position to infiltrate the upper part of the electrode assembly, the electrolyte can fully infiltrate the whole structure of the electrode assembly, the uniformity of the performance of the electrode assembly in the height direction is improved, and a lithium separation phenomenon is not easy to occur in the circulating charge and discharge process of a single battery, so that the capacity water jump phenomenon caused by the lithium separation can be reduced, the circulating performance of the single battery is ensured, the high-rate charging of the single battery is facilitated, and the electrochemical performance of the single battery is improved; and the risk of short circuit of the positive pole piece and the negative pole piece caused by lithium dendrite caused by lithium separation can be reduced, and the safety performance of the battery monomer is improved.

In some embodiments, an electrode assembly includes an electrode main body and a tab part connected to and protruding from the electrode main body; insulating member includes insulating part and holding portion, and the insulating part is located between end cover and the electrode main part, and holding portion is connected with the insulating part and caves in for the direction that the insulating part orientation deviates from the electrode main part, and the holding portion is used for holding utmost point ear's portion, and wherein, the insulating part is provided with the drain structure.

The liquid guide structure is arranged on the insulating part, so that interference of other components such as pole ear parts on the liquid guide structure can be reduced, and smooth liquid suction is guaranteed.

In some embodiments, the insulating part includes two side parts opposite to each other in a thickness direction of the electrode assembly, at least one of the two side parts having a liquid guide structure, the thickness direction of the electrode assembly being perpendicular to the height direction.

This application sets up the drain structure in the lateral part of insulating part, and the drain structure can not receive utmost point ear portion or the interference of portion of holding basically, can be smoothly with electrolyte drainage to the eminence that is located the low department.

In some embodiments, a liquid-conducting structure is disposed on both sides. All set up the drain structure on two lateral parts and can improve the imbibition effect.

In some embodiments, the liquid conducting structure is disposed within and extends through the insulating portion. The structure is simple, and the path of the through hole is short, so that the capillary action is favorably exerted.

In some embodiments, the liquid guiding structure penetrates the insulating part in a height direction. The liquid guide structure is a through hole extending along the height direction, the structural form of the through hole is simpler, the flow path is relatively shorter, the resistance of the electrolyte rising is relatively smaller, and the exertion of the capillary action can be further promoted.

In some embodiments, a drainage structure includes a drainage body and a first extension; the liquid guiding body at least partially extends along the height direction and penetrates through the surface of the insulating part; the first extending portion extends along a first direction, the first extending portion is communicated with the liquid guide body and penetrates through the surface, facing the electrode assembly, of the insulating portion, and the first direction is intersected with the height direction. The structural form is favorable for the liquid guide structure to contact with the electrode assembly, and is favorable for the absorption and the flow of electrolyte.

In some embodiments, the liquid guiding body includes a connection part extending in a height direction and communicating the first extension part and the second extension part, and a second extension part extending in a second direction and disposed opposite to the first extension part in the height direction, the second extension part penetrating a surface of the insulating part facing the electrode assembly, the second direction intersecting the height direction. The structural form is favorable for the contact of the liquid guide structure and the electrode assembly, and the absorption and the flow of electrolyte are favorable.

In some embodiments, the liquid guiding structure is a hollow structural body provided on a side of the insulating portion facing the electrode main body.

In some embodiments, the electrode assembly is a flat structure including a straight portion, a first bent portion and a second bent portion, the first bent portion and the second bent portion being located at both ends of the straight portion in a height direction, and the second bent portion being located above the first bent portion in the height direction; the first kink includes the first edge towards straight portion, and the second kink includes the second edge towards straight portion, and wherein, along direction of height, the drain structure extends to first edge downwards at least, and the drain structure extends to the second edge upwards at least.

Therefore, the electrolyte at the first bent part can flow to the second bent part through the liquid absorption effect of the liquid guide structure, the electrolyte can fully infiltrate the first bent part and the second bent part, the uniformity of the performance of the electrode assembly in the height direction is improved, and the lithium separation phenomenon of a single battery is not easy to occur in the circulating charge and discharge process, so that the capacity water jump phenomenon caused by the lithium separation can be reduced, the circulating performance of the single battery is ensured, the high-rate charge of the single battery is facilitated, and the electrochemical performance of the single battery is improved; and the risk of short circuit of the positive pole piece and the negative pole piece caused by lithium dendrite caused by lithium precipitation can be reduced, and the safety performance of the battery monomer is improved.

In some embodiments, the first bending portion includes a third edge that deviates from the straight portion, and the liquid guiding structure extends downwards to the third edge along the height direction, so that the liquid guiding structure can sufficiently guide the electrolyte located at the first bending portion to the second bending portion, and the infiltration effect on the second bending portion is improved, thereby ensuring the uniformity of the infiltration effect of the electrode assembly in the height direction.

In some embodiments, the second bending portion includes a fourth edge facing away from the straight portion, and the liquid guiding structure extends upward to the fourth edge along the height direction; the electrolyte can be fully drained to the second bending part by the liquid guiding structure, and a better wetting effect on the second bending part is achieved, so that the uniformity of the wetting effect of the electrode assembly in the height direction is guaranteed.

In some embodiments, the first bending part comprises two first side surfaces opposite to each other along the length direction of the flat structure, and the first side surfaces are in contact with the liquid guide structure; and/or along the length direction of the flat structure, the second bent part comprises two second side surfaces which are opposite to each other, and the second side surfaces are in contact with the liquid guide structure.

The first side of this application contacts and communicates with drain structure, and the electrolyte that first kink department can be absorb to the drain structure, promotes electrolyte to flow to the second kink by first kink through the drain structure. The second side surface is in contact with and communicated with the liquid guide structure, and the second bending part can absorb electrolyte in the liquid guide structure, so that the electrolyte is promoted to flow from the first bending part to the second bending part through the liquid guide structure.

In some embodiments, the liquid directing structure is provided in plurality, and the plurality of liquid directing structures are provided sequentially.

In another aspect, the present application provides a battery including the battery cell according to the above embodiment.

In yet another aspect, the present application provides an electric device including the battery cell according to the above embodiment. The battery cell is used for providing electric energy.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic view of a portion of a vehicle according to an embodiment of the present application;

fig. 2 is an exploded structural view of a battery pack according to an embodiment of the present application;

fig. 3 is a partial structural view of a battery according to an embodiment of the present application;

fig. 4 is a schematic structural view of a battery cell according to an embodiment of the present application;

fig. 5 is an exploded view schematically illustrating a battery cell according to an embodiment of the present disclosure;

fig. 6 is a schematic structural view of an insulating member of a battery cell according to some embodiments of the present application;

FIG. 7 is a schematic structural view of the fluid directing structure shown in FIG. 6;

fig. 8 is a schematic view of the structure of an insulating member of a battery cell according to other embodiments of the present application;

FIG. 9 is a schematic structural view of the fluid directing structure shown in FIG. 8;

in the drawings, the drawings are not necessarily to scale.

Wherein, in the figures, the various reference numbers:

x, height direction;

1. a vehicle; 2. a battery; 3. a controller; 4. a motor; 5. a box body; 501. a first tank portion; 502. a second tank portion; 503. an accommodating space; 6. a battery module; 7. a battery cell;

10. an electrode assembly;

11. a first bent portion; 111. a first edge; 112. a third edge; 113. a first side surface;

12. a second bent portion; 121. a second edge; 122. a fourth edge; 123. a second side surface;

13. a straight portion; 14. a pole ear portion; 15. an electrode body;

20. a housing assembly;

30. a housing; 31. an opening;

40. an end cap assembly; 41. an electrode terminal;

50. an end cap;

60. an insulating member; 611. an insulating section; 6111. a side portion; 612. an accommodating portion;

62. a drainage structure; 621. a drainage body; 6211. a connecting portion; 6212. a second extension portion; 622. a first extension portion;

62a, a liquid suction end; 62b and a liquid outlet end.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the drawings and embodiments. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical but is within the tolerance of the error. "parallel" is not strictly parallel but is within the tolerance of the error.

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed and removable connections as well as integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a flat body, a rectangular parallelepiped, or another shape, which is not limited in the embodiments of the present application. The battery cells are generally divided into a square battery cell and a soft package battery cell in a packaging manner, which is not limited in the embodiments of the present application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery cell includes an electrode assembly and an electrolyte, the electrode assembly including a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector; the positive current collector comprises a positive current collecting part and a positive electrode lug protruding out of the positive current collecting part, the positive current collecting part is coated with a positive active substance layer, and at least part of the positive electrode lug is not coated with the positive active substance layer. Taking a lithium ion battery monomer as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece comprises a negative pole current collector and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative current collecting part and a negative electrode lug protruding out of the negative current collecting part, the negative current collecting part is coated with a negative electrode active substance layer, and at least part of the negative electrode lug is not coated with the negative electrode active substance layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the spacer may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding type structure or a lamination type structure, and the embodiment of the present application is not limited thereto.

The battery cell may further include a housing assembly having a receiving cavity therein, the receiving cavity being a closed space provided by the housing assembly for the electrode assembly and the electrolyte. The shell assembly comprises a shell and an end cover assembly, wherein the end cover assembly comprises an end cover, the shell is of a hollow structure with one side opened, and the end cover covers the opening of the shell and is in sealing connection with the opening of the shell to form a containing cavity for containing the electrode assembly and electrolyte. The electrolyte can be electrolyte, and the electrolyte plays a role in conducting ions between the positive pole piece and the negative pole piece.

The inventor finds that in the recycling process of a single battery, electrolyte is accumulated at the bottom of a shell due to the action of gravity, so that the electrolyte can fully infiltrate an electrode assembly at the bottom, the electrode assembly far away from the bottom is poor in infiltration, the infiltration performance of the electrolyte on the whole electrode assembly is not uniform, and when lithium ions migrate in the electrode assembly far away from the bottom, the lithium ions can not be embedded into a negative electrode plate due to the lack of the electrolyte, so that metal lithium can be separated out on the surface of the negative electrode plate, and on one hand, the lithium separation can cause the single battery to generate capacity jump water at the later stage of the cycle, so that the cycle performance is deteriorated, and the single battery is not beneficial to large-rate charging; on the other hand, precipitated metal lithium is easy to develop into lithium dendrites, so that the separator can be punctured to cause short circuit of the positive pole piece and the negative pole piece, and safety risks are caused.

In view of this, the inventor provides a technical solution, and in this technical solution, a single battery is provided, in which a liquid guide structure having a liquid absorption function is arranged to guide an electrolyte at the bottom of a casing to a side of the casing away from the bottom, so that the electrolyte can uniformly infiltrate an electrode assembly, smooth migration of lithium ions is ensured, capacity exertion and cycle performance of the single battery are ensured, and safety performance of the single battery can be improved.

The technical scheme described in the embodiment of the application is suitable for the battery containing the battery cell and the electric device using the battery.

The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; the electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The power utilization device is not particularly limited in the embodiments of the present application.

For convenience of explanation, the following embodiments will be described with reference to an electric device as an example of a vehicle.

As shown in fig. 1, a battery 2 is provided inside a vehicle 1, and the battery 2 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, and for example, the battery 2 may serve as an operation power source of the vehicle 1.

The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being adapted to control the battery 2 to power the motor 4, e.g. for start-up, navigation and operational power demands while driving of the vehicle 1.

In some embodiments of the present application, the battery 2 may be used not only as an operation power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1.

As shown in fig. 2, the battery 2 includes a case 5 and a battery cell (not shown in fig. 2) accommodated in the case 5.

The case 5 is used for accommodating the battery cells, and the case 5 may have various structures. In some embodiments, the box body 5 may include a first box body portion 501 and a second box body portion 502, the first box body portion 501 and the second box body portion 502 cover each other, and the first box body portion 501 and the second box body portion 502 jointly define a receiving space 503 for receiving the battery cells. The second box portion 502 may be a hollow structure with an open end, the first box portion 501 is a plate-shaped structure, and the first box portion 501 covers the open side of the second box portion 502 to form the box 5 with the accommodating space 503; the first tank 501 and the second tank 502 may be hollow structures with one side open, and the open side of the first tank 501 may cover the open side of the second tank 502 to form the box 5 with the accommodating space 503. Of course, the first tank portion 501 and the second tank portion 502 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In order to improve the sealing performance after the first tank 501 and the second tank 502 are connected, a sealing member, such as a sealant or a gasket, may be provided between the first tank 501 and the second tank 502.

If the first box portion 501 covers the top of the second box portion 502, the first box portion 501 may also be referred to as an upper box cover, and the second box portion 502 may also be referred to as a lower box body.

In the battery 2, one or more battery cells may be provided. If the number of the battery monomers is multiple, the multiple battery monomers can be connected in series or in parallel or in series-parallel, and the series-parallel refers to that the multiple battery monomers are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers is accommodated in the box body 5; of course, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form the battery module 6, and a plurality of battery modules 6 may be connected in series or in parallel or in series-parallel to form a whole and accommodated in the box 5.

As shown in fig. 3, in some embodiments, there are a plurality of battery cells, and the plurality of battery cells are connected in series or in parallel or in series-parallel to form the battery module 6. The plurality of battery modules 6 are connected in series or in parallel or in series-parallel to form a whole and are accommodated in the case.

The plurality of battery cells in the battery module 6 may be electrically connected to each other through the bus bar, so as to realize parallel connection, series connection, or parallel connection of the plurality of battery cells in the battery module 6.

As shown in fig. 4 and 5, the battery cell 7 according to the embodiment of the present disclosure includes an electrode assembly 10 and a case assembly 20, and the electrode assembly 10 is accommodated in the case assembly 20.

In some embodiments, the housing assembly 20 may also be used to contain an electrolyte, such as an electrolyte. The housing assembly 20 may take a variety of configurations.

In some embodiments, the case assembly 20 may include a case 30 and an end cap assembly 40, the case 30 is a hollow structure with one side open, and the end cap assembly 40 covers the opening 31 of the case 30 and forms a sealed connection to form a receiving cavity for receiving the electrode assembly 10 and an electrolyte.

The housing 30 may be a rectangular parallelepiped or the like. The shape of the case 30 may be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 has a rectangular parallelepiped structure, a rectangular parallelepiped case may be used.

In some embodiments, the end cap assembly 40 includes an end cap 50, and the end cap 50 covers the opening 31 of the housing 30. The end cap 50 may have various structures, for example, the end cap 50 may have a plate-shaped structure, a hollow structure with one end open, and the like. Illustratively, in fig. 4, the housing 30 has a rectangular parallelepiped structure, the end cap 50 has a plate-like structure, and the end cap 50 covers the opening 31 at the top of the housing 30.

The end cap 50 may be made of an insulating material (e.g., plastic) or a conductive material (e.g., metal). When the end cap 50 is made of a metal material, the end cap assembly 40 may further include an insulating member 60, the insulating member 60 being located at a side of the end cap 50 facing the electrode assembly 10 to insulate and separate the end cap 50 from the electrode assembly 10.

In some embodiments, the end cap assembly 40 may further include an electrode terminal 41, the electrode terminal 41 being mounted on the end cap 50. The two electrode terminals 41 are defined as a positive electrode terminal and a negative electrode terminal, respectively, each of the two electrode terminals 41 being adapted to be electrically connected to the electrode assembly 10 to output electric power generated from the electrode assembly 10.

In other embodiments, the housing assembly 20 may have other structures, for example, the housing assembly 20 includes a housing 30 and two end cap assemblies 40, the housing 30 has a hollow structure with two opposite openings 31, and one end cap assembly 40 is correspondingly covered on one opening 31 of the housing 30 and forms a sealing connection to form a containing cavity for containing the electrode assembly 10 and the electrolyte. In this configuration, two electrode terminals 41 may be provided on one end cap assembly 40, while the other end cap assembly 40 is not provided with the electrode terminals 41, or one electrode terminal 41 may be provided on each of the two end cap assemblies 40.

In the battery cell 7, the electrode assembly 10 housed in the case assembly 20 may be one or more. Illustratively, in fig. 4, there are four electrode assemblies 10.

The electrode assembly 10 includes a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 10 may be a wound electrode assembly, a laminated electrode assembly, or other form of electrode assembly.

As shown in fig. 4-6, in some embodiments, battery cell 7 includes a housing 30, an electrolyte, an electrode assembly 10, and an end cap assembly 40; at least one end of the shell 30 is provided with an opening 31, and the plane of the opening 31 is parallel to the height direction X of the single battery 7; the electrolyte is contained in the case 30; the electrode assembly 10 is accommodated in the case 30; the end cap assembly 40 includes an end cap 50 for capping the opening 31 to seal the case 30, and an insulating member 60 positioned between the end cap 50 and the electrode assembly 10, the insulating member 60 including a liquid guiding structure 62, the liquid guiding structure 62 extending at least partially in the height direction X to guide the electrolyte in the height direction X.

When the battery cell 7 is placed, the height direction X of the battery cell 7 may be considered to be parallel to the vertical direction. The electrolyte is contained in the case 30, and the electrolyte occupies only a part of the space of the case 30 because the electrolyte does not completely fill the inner space of the case 30, and thus the electrolyte flows to the bottom of the case 30 by gravity. The plane of the opening 31 of the case 30 is parallel to the height direction X of the battery cell 7, and may be absolutely parallel or approximately parallel.

The electrode assembly 10 is disposed in the casing 30, and in order to ensure normal charging and discharging of the battery cell 7, the electrode assembly 10 needs to be soaked in the electrolyte, but in the height direction X, a portion of the electrode assembly 10 located at the bottom of the casing 10 can be soaked in the electrolyte, but a portion located at the top of the casing 10 cannot be sufficiently soaked in the electrolyte, so that the electrode assembly 10 is insufficiently soaked in the height direction X.

The end cap assembly 40 includes an end cap 50 and an insulating member 60, the housing 30 generally has an opening 31, and the end cap 50 can cover the opening 31, so that the housing 30 and the end cap assembly 40 form a sealed structure, reducing the risk of electrolyte leakage. An insulating member 60 is positioned between the end cap 50 and the electrode assembly 10 to insulate and separate the end cap 50 from the electrode assembly 10, reducing the risk of short circuits occurring in direct contact between the end cap 50 and the electrode assembly 10. Specifically, the insulating member 60 includes a liquid guiding structure 62, and at least a portion of the liquid guiding structure 62 extends in the height direction X and is capable of guiding the electrolyte from low to high in the height direction X. The wicking structure 62 may be self-diffusing to drain, such as a test strip; a member having a capillary action (e.g., a hollow structure); or through holes (which may also have a capillary action) provided in the insulating member 60; the electrolyte at the lower part can overcome the action of gravity under the action of capillary force and flows to the higher part along the direction opposite to the gravity direction.

In the related art, the electrolyte may flow downward in a vertical direction due to gravity, and thus the electrolyte may be accumulated at a lower portion, and the electrolyte at a higher portion is insufficient, and the electrode assembly 10 is more likely to induce a risk of lithium precipitation closer to the higher portion, and the electrode assembly 10 is more stable in performance closer to the lower portion, and the electrode assembly 10 is non-uniform in performance in the vertical direction.

The present application is provided with an insulating member 60, the insulating member 60 includes a liquid guiding structure 62, and the insulating member 60 can insulate and separate the end cap 50 and the electrode assembly 10, thereby improving safety performance; the liquid guide structure 62 extends at least partially along the height direction X, and through the liquid absorption effect of the liquid guide structure 62, the electrolyte at the lower position can flow to the upper position to infiltrate the electrode assembly 10, so that the electrolyte can not only fully infiltrate the whole structure of the electrode assembly 10, and the uniformity of the performance of the electrode assembly 10 in the height direction X is improved, and the lithium separation phenomenon is not easy to occur in the cycle charging and discharging process of the battery monomer 7, thereby reducing the capacity water jump phenomenon caused by the lithium separation, ensuring the cycle performance of the battery monomer 7, facilitating the high-rate charging of the battery monomer 7, and improving the electrochemical performance of the battery monomer 7; and the risk of short circuit of the positive pole piece and the negative pole piece caused by lithium dendrite caused by lithium precipitation can be reduced, and the safety performance of the single battery 7 is improved.

In some embodiments, the electrode assembly 10 includes an electrode main body 15 and a tab 14 connected to the electrode main body 15 and protruding from the electrode main body 15. In order to fit the structural arrangement of the electrode assembly 10, the insulating member 60 includes an insulating part 611 and a receiving part 612, the insulating part 611 is located between the end cap 50 and the electrode main body 15 of the electrode assembly 10, the receiving part 612 is connected with the insulating part 611 and is recessed relative to the insulating part 611 in a direction away from the electrode main body 15, and the receiving part 612 is used for receiving the electrode ear part 14; the insulating part 611 is provided with a liquid guiding structure 62.

The insulating part 611 is a main insulating component of the insulating member 60, which is capable of insulating the end cap 50 and the electrode assembly 10, and particularly, the insulating part 611 serves to insulate the end cap 50 and the electrode body 15 of the electrode assembly 10.

The receiving part 612 is in the form of a groove, and is recessed in a direction away from the electrode main body 15 of the electrode assembly 10, the receiving part 612 provides a receiving space for the tab part 14, and the tab part 14 is received in the receiving part 612, which facilitates connection between the tab part 14 and the electrode terminal 41 on the end cap 50. Of course, the receiving portion 612 is not limited to the above-described groove form, and may be provided in other structures, etc.

The insulating part 611 is provided with the liquid guiding structure 62, so that interference of other members, such as the pole ear part 14 and the like, with the liquid guiding structure 62 can be reduced, and smooth liquid suction can be ensured.

As shown in fig. 5 to 7, in some embodiments, the insulating part 611 includes two side parts 6111 opposite to each other in a thickness direction of the electrode assembly 10, and at least one of the two side parts 6111 is provided with the liquid guide structure 62. Further, both side portions 6111 are provided with the liquid guiding structure 62. In fig. 6, the Y direction represents the thickness direction of the electrode assembly 10, the Y direction is perpendicular to the height direction X, i.e., the two side portions 6111 are opposed to each other in the Y direction.

By providing the liquid guiding structure 62 on the side portion 6111 of the insulating portion 611, the liquid guiding structure 62 can smoothly guide the electrolyte at a lower position to a higher position in the height direction X without being interfered by the pole ear portion 14 or the accommodating portion 612. The wicking structure 62 on both sides 6111 can improve wicking.

In the present application, the structure of the liquid guiding structure 62 has various forms, and a specific structural form of the liquid guiding structure 62 will be described next.

In some embodiments, the liquid guiding structure 62 is disposed inside the insulating portion 611 and penetrates through the insulating portion 611. It is understood that the liquid guiding structure 62 is a through hole structure formed in the insulating main body 61, and the through hole structure has a capillary action and can guide the electrolyte from a lower position to a higher position. The through-holes may extend in a single direction, such as the height direction X; the through hole may extend in a plurality of directions, for example, a part of the through hole extends in the height direction X, and another part of the through hole extends in a direction intersecting the height direction X, and the through hole penetrates the insulating portion 611 regardless of the extending manner. The structure is simple, and the path of the through hole is short, so that the capillary action is favorably exerted.

As shown in fig. 5 to 7, as some examples, the liquid guiding structure 62 penetrates the insulating portion 611 in the height direction X. This configuration is understood to mean that the liquid guiding structure 62 is a through hole extending in the height direction X, and the configuration of this through hole is simpler, the flow path thereof is relatively shorter, the resistance to the rise of the electrolyte is relatively smaller, and the exertion of the capillary action can be further promoted.

As further examples, as shown in fig. 5-9, the fluid-directing structure 62 may include a fluid-directing body 621 and a first extension 622; at least a part of the liquid guiding body 621 extends along the height direction X, and the liquid guiding body 621 penetrates the surface of the insulating part 611; the first extending portion 622 is communicated with the fluid guiding body 621, the first extending portion 622 penetrates through the surface of the insulating part 611 facing the electrode assembly 10, the first extending portion 622 extends along a first direction, the first direction intersects with the height direction X, wherein one of the first extending portion 622 and the fluid guiding body 621 can be used for sucking the electrolyte at a lower position, and the other one can be used for discharging the sucked electrolyte at a higher position. In the present application, the first direction intersects with the height direction X, which means that the first direction is perpendicular to the height direction X, or an included angle with the height direction X is an acute angle. When the first direction is perpendicular to the height direction X, the first direction may also be perpendicular to the Y direction so that the first extension portion 622 is in contact with the electrode assembly 10. The Z direction shown in fig. 9 represents a first direction, and the first direction Z, the height direction X, and the Y direction are perpendicular two by two.

The liquid guiding structure 62 at least includes two parts, one part is the liquid guiding body 621, the other part is the first extending part 622, the first extending part 622 extends along the first direction, the first extending part 622 is more easily in direct contact with the electrode assembly 10 located at a lower position, or in direct contact with the electrode assembly 10 located at a higher position, and the absorption or flowing of the electrolyte is facilitated.

At least a portion of the liquid guiding body 621 extends in the height direction X, which includes various cases, in which one end of the liquid guiding body 621 needs to penetrate the surface of the insulating part 611. Another situation is that a part of the liquid guiding body 621 extends along the height direction X, and another part extends along the second direction, specifically, the liquid guiding body 621 includes a connecting portion 6211 and a second extending portion 6212, the connecting portion 6211 extends along the height direction X, and the connecting portion 6211 connects the second extending portion 6212 and the first extending portion 622; the second extending portion 6212 extends in the second direction, and is disposed opposite to the first extending portion 622 in the height direction X, and the second extending portion 6212 penetrates the surface of the insulating portion 611 facing the electrode assembly 10. One of the first and second extension portions 622 and 6212 may be used to suck the electrolyte at a low position, and the other may be used to discharge the sucked electrolyte to a high position, in which case the second extension portion 6212 is more easily brought into direct contact with a portion of the electrode assembly 10 at the low position or with a portion of the electrode assembly 10 at the high position, facilitating the suction or flow of the electrolyte. In the present application, the second direction intersects with the height direction X, which means that the second direction is perpendicular to the height direction X, or an included angle with the height direction X is an acute angle. When the second direction is perpendicular to the height direction X, the second direction may also be perpendicular to the Y direction so that the second extension portion 6212 is in contact with the electrode assembly 10. The first direction may be parallel to the second direction, or may intersect the second direction. The first direction and the second direction are parallel in fig. 9, and both can be referred to as Z-direction.

Further, the connecting portion 6211 is located between the second extending portion 6212 and the first extending portion 622, i.e., the first extending portion 622 and the second extending portion 6212 are respectively communicated with both ends of the connecting portion 6211. The arrangement is more favorable for sucking and discharging the electrolyte.

For example, the first extending portion 622 may be in direct contact with the first bending portion 11 of the electrode assembly 10, the second extending portion 6212 may be in direct contact with the second bending portion 12 of the electrode assembly 10, and the first extending portion 622 may absorb the electrolyte at the first bending portion 11 and then flow to the second bending portion 12 through the connecting portion 6211 and the second extending portion 6212. Of course, the first extending portion 622 may also be in direct contact with the second bending portion 12, and the second extending portion 6212 may be in direct contact with the first bending portion 11, and the flow direction of the electrolyte is opposite to the above-mentioned flow direction.

The structure is more beneficial to the liquid guide structure 62 to absorb the electrolyte and achieve the purpose of circulating the electrolyte.

In other embodiments, the liquid guiding structure 62 is connected to a side of the insulating part 611 facing the electrode main body 15, and is formed to protrude toward the electrode assembly 10 with respect to the insulating part 611. The liquid guiding structure 62 may have a liquid suction cavity on a side facing the insulating portion 611, and the electrolyte flows through the liquid suction cavity. Further, the liquid guiding structure 62 and the insulating part 611 may be an integrated structure, or may be a composite structure of separate structures.

In still other embodiments, the liquid guiding structure 62 is connected to a side of the insulating part 611 facing the electrode main body 15, and the liquid guiding structure 62 is a hollow structure body. This structure is understood to mean that the liquid guiding structure 62 and the insulating portion 611 are independent structures, and the liquid guiding structure 62 is a hollow structure, and the electrolyte flows from a lower portion to a higher portion of the hollow structure. Furthermore, the hollow structure body is a cylindrical hollow structure body, and the cylindrical hollow structure body is more favorable for exerting the capillary action and improving the liquid absorption effect.

In the present application, the electrode assembly 10 has various structural forms, and the electrode assembly 10 may be a winding type electrode assembly, a laminated type electrode assembly, or the like.

When battery monomer 7 adopted lamination formula electrode subassembly, through the imbibition effect of drain structure 62, can be to highly the drainage with the electrolyte that is located the low department for the holistic effect of soaking of lamination formula electrode subassembly 10 is comparatively homogeneous, improves the holistic performance of electrode subassembly 10.

When the battery cell 7 adopts the winding type electrode assembly, the winding type electrode assembly is of a flat structure, the problem of insufficient electrolyte infiltration is easily caused at the bending position of the winding type electrode assembly, the winding type electrode assembly is placed in the shell 30 along the height direction X, the bending position of the winding type electrode assembly is embodied as a first bending part 11 and a second bending part 12 of the electrode assembly 10 in the height direction X, the electrode assembly 10 further comprises a straight part 13, the straight part 13 is positioned between the first bending part 11 and the second bending part 12 and is connected with the first bending part 11 and the second bending part 12, and in view of the fact that the electrode assembly 10 is the winding type electrode assembly, the straight part 13, the first bending part 11 and the second bending part 12 are embodied as an integral structure. The straight portion 13, the first bent portion 11, and the second bent portion 12 are electrode bodies 15 of the core of the electrode assembly 10, which are mainly used for generating an electrochemical reaction to generate current, etc.; in order to draw out current generated from the electrode main body 15 of the electrode assembly 10, the electrode assembly 10 may further include a tab part 14, the tab part 14 being connected to the straight part 13, the tab part 14 being capable of drawing out current generated from a main body part and transmitting external current to the main body part, thereby achieving cyclic charge and discharge of the battery cell 7.

The second bent portion 12 is located above the first bent portion 11 in the height direction X; the first bent part 11 includes a first edge 111 facing the straight part 13, and the second bent part 12 includes a second edge 121 facing the straight part 13; at least a portion of the liquid guiding structure 62 extends along the height direction X, and extends downward to at least the first edge 111 and extends upward to at least the second edge 121, so as to guide the electrolyte at the first bending portion 11 to the second bending portion 12 in the height direction X.

The electrode assembly 10 includes the first bent portion 11 and the second bent portion 12 opposite to each other in the height direction X, and the both ends of the electrode assembly 10 are soaked in the electrolyte to ensure uniform performance of the electrode assembly 10 as a whole. In the electrode assembly 10, the first bent portion 11 has a partial structure of the positive electrode plate, a partial structure of the negative electrode plate, and a partial structure of the separator, that is, it is an integral structure formed by the three, and a gap is formed between the adjacent positive electrode plate and the separator, and a gap is also formed between the adjacent negative electrode plate and the separator, in other words, there may be a gap in the inner space of the first bent portion 11, and the gap is favorable for absorbing and retaining the electrolyte, so that the electrolyte can infiltrate into the first bent portion 11. Similarly, the second bent portion 12 also has a partial structure of the positive electrode tab, a partial structure of the negative electrode tab, and a partial structure of the separator, that is, there may be a gap in the inner space of the second bent portion 12, which is beneficial to absorb and retain the electrolyte, so that the electrolyte can infiltrate the second bent portion 12. It should be noted that the first bent portion 11 in the present application mainly means that after the battery cell 7 is placed, the bottom end of the electrode assembly 10 in the height direction X is defined as the first bent portion 11, and the top end of the electrode assembly 10 in the height direction is defined as the second bent portion 12. However, the first folded portion 11 and the second folded portion 12 are not substantially different in structure, and are only for distinguishing the positions thereof in the height direction X.

At least a portion of the liquid guiding structure 62 extends along the height direction X, and extends downward to at least the first edge 111, and is capable of contacting the electrolyte at the first bent portion 11, and the liquid guiding structure 62 is capable of guiding the electrolyte at the first bent portion 11 toward the second bent portion 12 and extends upward to at least the second edge 121, so that the electrolyte can flow to the second bent portion 12 and wet the second bent portion 12.

In the present application, the electrolyte at the first bent portion 11 may refer to the electrolyte inside the first bent portion 11, or may refer to the electrolyte around the first bent portion 11; accordingly, the electrolyte at the second bent portion 12 may refer to the electrolyte inside the second bent portion 12, and may also refer to the electrolyte around the second bent portion 12.

Through the liquid absorption effect of the liquid guide structure 62, the electrolyte at the first bent part 11 can flow to the second bent part 12, the electrolyte can fully infiltrate the first bent part 11 and the second bent part 12, the uniformity of the performance of the electrode assembly 10 in the height direction X is improved, and the lithium separation phenomenon is not easy to occur in the cyclic charge and discharge process of the single battery 7, so that the capacity water jump phenomenon caused by the lithium separation can be reduced, the cyclic performance of the single battery 7 is ensured, the high-rate charge of the single battery 7 is facilitated, and the electrochemical performance of the single battery 7 is improved; and the risk of short circuit of the positive pole piece and the negative pole piece caused by lithium dendrite caused by lithium separation can be reduced, and the safety performance of the single battery 7 is improved.

In some embodiments, the first bending portion 11 includes a third edge 112 away from the straight portion 13, and the liquid guiding structure 62 extends downward to the third edge 112 along the height direction X. The first edge 111 and the third edge 112 are opposed to each other in the height direction X.

Along the height direction X, the liquid guiding structure 62 extends downward to the third edge 112; the electrolyte at the first bent portion 11 can be sufficiently drained to the second bent portion 12 by the liquid guiding structure 62, so that the wetting effect on the second bent portion 12 is improved, and the uniformity of the wetting effect of the electrode assembly 10 in the height direction X is ensured.

In some embodiments, the second bending portion 12 includes a fourth edge 122 away from the straight portion 13, and the liquid guiding structure 62 extends upward to the fourth edge 122 along the height direction X; the liquid guiding structure 62 can sufficiently guide the electrolyte to the second bent portion 12, so as to achieve a better wetting effect on the second bent portion 12, thereby ensuring uniformity of the wetting effect of the electrode assembly 10 in the height direction X.

As shown in fig. 5-9, in some embodiments, the liquid guiding structure 62 includes a liquid suction end 62a and a liquid outlet end 62b, the liquid suction end 62a being the end for sucking liquid as the name implies, and the liquid outlet end 62b being the end for discharging liquid.

The liquid suction end 62a is in contact with the first bent portion 11, and the liquid guiding structure 62 can suck the electrolyte at the first bent portion 11, so as to promote the electrolyte to flow from the first bent portion 11 to the second bent portion 12 through the liquid guiding structure 62. Of course, the liquid-absorbing end 62a may not be in direct contact with the first bent portion 11, and the electrolyte may flow toward the liquid-outlet end 62b by capillary action. Specifically, along the length direction of the flat structure, the first bent portion 11 includes two first side surfaces 113 opposite to each other, and the first side surfaces 113 are in contact with the liquid guiding structure 62. In the present application, the longitudinal direction of the flat structure is perpendicular to the height direction X, and in fig. 5 the longitudinal direction of the flat structure is parallel to the Z direction.

The liquid outlet end 62b is in contact with and communicated with the second bent portion 12, the second bent portion 12 can absorb the electrolyte located in the liquid guiding structure 62, so as to promote the electrolyte to continuously flow from the first bent portion 11 to the second bent portion 12 through the liquid guiding structure 62, and the electrolyte located in the second bent portion 12 may flow back to the first bent portion 11 under the action of gravity, so that the flow is beneficial to the circulation of the electrolyte between the first bent portion 11 and the second bent portion 12, and the wetting performance of the electrolyte on the whole electrode assembly 10 can be ensured. For example, the liquid guiding structure 62 absorbs liquid by capillary action, the second bending portion 12 directly contacts the liquid outlet end 62b of the liquid guiding structure 62 to absorb the electrolyte of the liquid guiding structure 62, and after the electrolyte in the liquid guiding structure 62 flows to the second bending portion 12, the electrolyte will continue to absorb liquid from the first bending portion 11 to the second bending portion 12 by capillary action, so that the electrolyte continuously flows to the second bending portion 12 to wet the second bending portion 12. Of course, the liquid outlet end 62b may not contact the second bending portion 12, for example, the liquid outlet end 62b of the liquid guiding structure 62 is higher than the second bending portion 12, the electrolyte absorbed by the liquid guiding structure 62 flows out through the liquid outlet end 62b under the capillary action, and the flowed-out electrolyte can flow to the second bending portion 12. Specifically, along the length direction of the flat structure, the second bent portion 12 includes two second side surfaces 123 opposite to each other, and the second side surfaces 123 are in contact with the liquid guiding structure 62.

In some embodiments, the fluid-directing structure 62 may be provided in plurality, with a plurality of fluid-directing structures 62 being provided in succession. The plurality of liquid guiding structures 62 are used for guiding the electrolyte at the first bent portion 11 to the second bent portion 12. Imbibition through a plurality of drain structures 62 can improve the imbibition effect, further improves the infiltration effect of electrolyte to second kink 12 to expect the infiltration effect homogeneous of first kink 11 and second kink 12, thereby make the performance homogeneous of electrode subassembly 10 in the charge-discharge process.

Further, the plurality of liquid guide structures 62 are arranged at intervals, so that the liquid suction process among the plurality of liquid guide structures 62 can not be interfered basically, and the liquid suction process is performed stably. Of course, the plurality of liquid guiding structures 62 may also be disposed in series, and the series may be embodied as a projection of the plurality of liquid guiding structures 62 on the insulating part 611 is disposed in series, for example, the liquid guiding structures 62 may be hollow pipes, and a plurality of hollow pipes are disposed in series on the insulating part 611, that is, the hollow pipes are adjacent to each other, so as to reduce the space occupancy rate.

As shown in fig. 4, 5, 8 and 9, the battery cell 7 includes a case 30, an electrolyte, an electrode assembly 10 and an end cap assembly 40 as a specific embodiment of the present application; the case 30 contains an electrolyte; the electrode assembly 10 is disposed in the case 30, the electrode assembly 10 including a first bent portion 11 and a second bent portion 12 opposite to each other in a height direction X of the battery cell 7, the second bent portion 12 being located above the first bent portion 11 in the height direction X; the first bent part 11 includes a first edge 111 facing the second bent part 12, and the second bent part 12 includes a second edge 121 facing the first bent part 11; the end cap assembly 40 includes an end cap 50 and an insulating member 60, the end cap 50 extends along the height direction X and is used for covering the casing 30 to seal the casing 30, the insulating member 60 includes a liquid guiding structure 62, the insulating member 60 is located between the end cap 50 and the electrode assembly 10, at least a portion of the liquid guiding structure 62 extends along the height direction X, and extends downward to at least the first edge 111 and extends upward to at least the second edge 121, so as to guide the electrolyte at the first bent portion 11 to the second bent portion 12 in the height direction X, so as to guide the electrolyte at the first bent portion 11 to the second bent portion 12.

The liquid guiding structure 62 includes a liquid guiding body 621 and a first extending portion 622; the first extending portion 622 extends along the first direction and is communicated with the first bending portion 11; the liquid guiding body 621 comprises a connecting portion 6211 extending along the height direction X and a second extending portion 6212 extending along the second direction, the connecting portion 6211 is located between the second extending portion 6212 and the first extending portion 622 and is communicated with the second extending portion 6212 and the first extending portion 622; the second extending portion 6212 communicates with the second bending portion 12. The first direction is perpendicular to the height direction X, the second direction is perpendicular to the height direction X, and the first direction is parallel to the second direction.

The first extending portion 622 is in contact with the first side surface 113 of the first bending portion 11, the electrolyte located in the first bending portion 11 can flow through the connecting portion 6211 through the first extending portion 622 and flow to the second extending portion 6212 from the connecting portion 6211, the second extending portion 6212 is in contact with the second side surface 123 of the second bending portion 12, and the electrolyte can flow out to the second bending portion 12 from the second extending portion 6212, so that the electrolyte can infiltrate the second bending portion 12, the infiltration performance of the electrode assembly 10 in the height direction is uniform, and the risk of lithium precipitation of the single battery 7 is reduced in the circulating charge and discharge process of the single battery 7, and the cycle performance and the safety performance of the single battery 7 are ensured.

While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and particularly, features described in connection with the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein, but rather to cover all embodiments falling within the scope of the appended claims.

Claims (15)

1. A battery cell, comprising:

the battery comprises a shell, at least one end of which is provided with an opening, and the plane of the opening is parallel to the height direction of the battery monomer;

an electrolyte accommodated in the case;

an electrode assembly accommodated in the case;

an end cap assembly including an end cap for capping the opening to seal the case and an insulating member between the end cap and the electrode assembly, the insulating member including a liquid guiding structure extending at least partially in the height direction to guide the electrolyte in the height direction.

2. The battery cell of claim 1,

the electrode assembly comprises an electrode main body and an electrode lug part which is connected with the electrode main body and protrudes out of the electrode main body;

the insulating member includes an insulating portion located between the end cap and the electrode main body, and an accommodating portion connected to the insulating portion and recessed with respect to the insulating portion toward a direction away from the electrode main body, the accommodating portion being for accommodating the tab portion,

wherein, the insulating part is provided with the drain structure.

3. The battery cell of claim 2,

the insulating part includes two side parts opposite to each other in a thickness direction of the electrode assembly, at least one of the two side parts having the liquid guide structure, the thickness direction of the electrode assembly being perpendicular to the height direction.

4. The battery cell of claim 3,

the liquid guide structures are arranged on the two side parts.

5. The battery cell as recited in claim 2 wherein the fluid conducting structure is disposed within and through the insulating portion.

6. The battery cell as recited in claim 5 wherein the liquid-conducting structure penetrates the insulating portion in the height direction.

7. The battery cell as recited in claim 5, wherein the liquid directing structure comprises:

the liquid guiding body at least partially extends along the height direction and penetrates through the surface of the insulating part; and

and a first extension part extending in a first direction, the first extension part communicating with the liquid guide body and penetrating through a surface of the insulating part facing the electrode assembly, the first direction intersecting the height direction.

8. The battery cell as recited in claim 7, wherein the fluid-conducting body includes a connecting portion extending in the height direction and communicating the first and second extending portions, and a second extending portion extending in a second direction and disposed opposite to the first extending portion in the height direction, the second extending portion penetrating a surface of the insulating portion facing the electrode assembly, the second direction intersecting the height direction.

9. The battery cell of claim 2,

the liquid guide structure is a hollow structure body, and the hollow structure body is arranged on one side, facing the electrode main body, of the insulating part.

10. The battery cell according to any one of claims 1 to 9, wherein the electrode assembly is a flat structure including a flat portion, a first bent portion, and a second bent portion, the first bent portion and the second bent portion being located at both ends of the flat portion in the height direction, and the second bent portion being located above the first bent portion in the height direction;

the first bending part comprises a first edge facing the straight part, the second bending part comprises a second edge facing the straight part,

wherein, along the height direction, the liquid guiding structure extends downwards at least to the first edge, and the liquid guiding structure extends upwards at least to the second edge.

11. The battery cell of claim 10,

the first bending part comprises a third edge deviating from the straight part, and the liquid guide structure extends downwards to the third edge along the height direction; and/or

The second bending part comprises a fourth edge deviating from the straight part, and the liquid guide structure extends upwards to the fourth edge along the height direction.

12. The battery cell of claim 10,

along the length direction of the flat structure, the first bending part comprises two first side surfaces opposite to each other, and the first side surfaces are in contact with the liquid guide structure; and/or

Along the length direction of the flat structure, the second bending part comprises two second side surfaces opposite to each other, and the second side surfaces are in contact with the liquid guide structure.

13. The battery cell according to any one of claims 1-9, wherein the liquid guiding structure is provided in plurality, and a plurality of liquid guiding structures are provided in succession.

14. A battery comprising a cell according to any one of claims 1 to 13.

15. An electrical device comprising the battery of claim 14, wherein the battery is configured to provide electrical energy.

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