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

Abstract

The present application relates to a battery cell, a battery and an electric device. The battery cell includes a casing, an electrolyte, an electrode assembly and an end cap assembly; at least one end of the casing is provided with an opening, and the plane where the opening is located is parallel to the height direction of the battery cell; the electrolyte is accommodated in the casing; the electrode assembly is accommodated in the The housing; the end cover assembly includes an end cover and an insulating member, the end cover is used to cover the opening to seal the housing, the insulating member is located between the end cover and the electrode assembly, the insulating member includes a liquid-conducting structure, and the liquid-conducting structure is at least partially along the height The direction extends to guide the electrolyte in the height direction. The present application can improve the performance of battery cells.

Description

Battery cells, batteries and electrical devices

technical field

The present application relates to the technical field of batteries, in particular to battery cells, batteries and electrical devices.

Background technique

Rechargeable batteries have the advantages of small size, high energy density, high safety, small self-discharge, and long life. They are widely used in energy storage, communications, electric vehicles, aerospace and other fields. A battery includes a plurality of battery cells connected in series, parallel or in parallel.

With the expansion of the application range of battery cells, the performance requirements for battery cells are gradually increasing, especially their cycle performance and safety performance still need to be improved.

Utility model content

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

On the one hand, according to the embodiment of the present application, a battery cell is proposed. The battery cell includes a casing, an electrolyte, an electrode assembly, and an end cap assembly; at least one end of the casing is provided with an opening, and the plane where the opening is located and the battery cell The height direction is parallel; the electrolyte is accommodated in the casing; the electrode assembly is accommodated in the casing; the end cap assembly includes an end cap and an insulating member, the end cap is used to cover the opening to seal the casing, and the insulating member is located between the end cap and the electrode assembly Between them, the insulating member includes a liquid-conducting structure, and the liquid-conducting structure at least partially extends along the height direction, so as to guide the electrolyte in the height direction.

Therefore, the present application is provided with an insulating member, the insulating member includes a liquid-conducting structure, and the insulating member can insulate and separate the end cover from the electrode assembly to improve safety performance; the liquid-conducting structure extends at least partly along the height direction, and the liquid-conducting structure absorbs The action of the liquid makes the electrolyte at the lower place flow to the higher place to infiltrate the top of the electrode assembly. The electrolyte can not only fully infiltrate the overall structure of the electrode assembly, but also improve the uniformity of the performance of the electrode assembly in the height direction, making the battery cell in the Lithium precipitation phenomenon is not easy to occur in the cycle charge and discharge process, so as to reduce the capacity diving phenomenon caused by lithium precipitation, ensure the cycle performance of the battery cell, and facilitate the high-rate charging of the battery cell, thereby improving the battery capacity. Chemical properties; and can reduce the risk of short-circuiting between positive and negative pole pieces caused by lithium dendrites caused by lithium analysis, and improve the safety performance of battery cells.

In some embodiments, the electrode assembly includes an electrode body and a tab part that is connected to the electrode body and protrudes from the electrode body; the insulating member includes an insulating part and a receiving part, the insulating part is located between the end cap and the electrode main body, and the receiving part is connected to the electrode body. The insulating part is connected to and recessed in a direction away from the electrode main body relative to the insulating part, and the accommodating part is used for accommodating the tab part, wherein the insulating part is provided with a liquid-conducting structure.

In the present application, the liquid-conducting structure is provided on the insulating part, which can reduce the interference of other components, such as the tab part, on the liquid-conducting structure, and ensure the smooth progress of liquid absorption.

In some embodiments, along the thickness direction of the electrode assembly, the insulating portion includes two side portions opposite to each other, at least one of the two side portions has a liquid-conducting structure, and the thickness direction of the electrode assembly is perpendicular to the height direction.

In the present application, the liquid guiding structure is arranged on the side of the insulating part, and the liquid guiding structure is basically not interfered by the lug or the containing part, and can smoothly drain the electrolyte located at a low place to a high place.

In some embodiments, liquid guiding structures are provided on both sides. Providing liquid-conducting structures on both sides can improve the liquid-absorbing effect.

In some embodiments, the liquid conducting structure is disposed in the insulating portion and penetrates through the insulating portion. This structural form is relatively simple, and because the path of the through hole is relatively short, it is beneficial to exert capillary action.

In some embodiments, the liquid conducting structure penetrates through the insulating part along the height direction. The liquid guide structure is a through hole extending along the height direction. This kind of through hole structure is simpler, its flow path is relatively shorter, and the resistance of the electrolyte to rise is relatively small, which can further promote the capillary action.

In some embodiments, the liquid guiding structure includes a liquid guiding body and a first extension part; the liquid guiding body extends at least partially along the height direction, and the liquid guiding body penetrates the surface of the insulating part; the first extending part extends along a first direction, and the second extending part An extension part communicates with the liquid-guiding body, and runs through the surface of the insulating part facing the electrode assembly, and the first direction intersects the height direction. This structural form is beneficial to the contact between the liquid-conducting structure and the electrode assembly, and is beneficial to the absorption and flow of the electrolyte.

In some embodiments, the liquid guiding body includes a connecting portion and a second extending portion, the connecting portion extends along the height direction and communicates with the first extending portion and the second extending portion, the second extending portion extends along the second direction and is connected to the first extending portion The portions are arranged opposite to each other along the height direction, the second extension portion penetrates the surface of the insulating portion facing the electrode assembly, and the second direction intersects the height direction. This structural form is beneficial to the contact between the liquid-conducting structure and the electrode assembly, and is beneficial to the absorption and flow of the electrolyte.

In some embodiments, the liquid conducting structure is a hollow structure, and the hollow structure is disposed on a side of the insulating part facing the electrode body.

In some embodiments, the electrode assembly is a flat structure, and the flat structure includes a straight part, a first bent part, and a second bent part, and the first bent part and the second bent part are located along the height of the straight part. direction, and in the height direction, the second bent portion is located above the first bent portion; the first bent portion includes a first edge facing the straight portion, and the second bent portion includes a first edge facing the straight portion The second edge, wherein, along the height direction, the liquid guiding structure extends downward to at least the first edge, and the liquid guiding structure extends upward to at least the second edge.

Therefore, the application uses the liquid absorption effect of the liquid-conducting structure to enable the electrolyte at the first bending part to flow to the second bending part, and the electrolyte can not only fully infiltrate the first bending part, but also It can fully infiltrate the second bending part, improve the uniformity of the performance of the electrode assembly in the height direction, and make the battery cell less prone to lithium precipitation during the cycle charge and discharge process, thereby reducing the capacity drop caused by lithium precipitation phenomenon, to ensure the cycle performance of the battery cell, which is conducive to the high-rate charging of the battery cell, thereby improving the electrochemical performance of the battery cell; and can reduce the lithium dendrites caused by the analysis of lithium to cause positive and negative electrodes. Short circuit risk, improve the safety performance of battery cells.

In some embodiments, the first bent part includes a third edge away from the straight part, and the liquid guiding structure extends downward to the third edge along the height direction, so that the liquid guiding structure can fully dissipate the electrolyzer at the first bent part. The liquid is drained to the second bending part to improve the wetting effect on the second bending part, thereby ensuring the uniformity of the wetting effect of the electrode assembly in the height direction.

In some embodiments, the second bending portion includes a fourth edge away from the straight portion, and the liquid guiding structure extends upwards to the fourth edge along the height direction; so that the liquid guiding structure can fully drain the electrolyte to the second bending portion , to achieve a better wetting effect on the second bent portion, thereby ensuring the uniformity of the wetting effect of the electrode assembly in the height direction.

In some embodiments, along the length direction of the flat structure, the first bending portion includes two first side faces opposite to each other, and the first side is in contact with the liquid guiding structure; and/or along the length direction of the flat structure, The second bending portion includes two second side surfaces opposite to each other, and the second side surfaces are in contact with the liquid guiding structure.

The first side of the application is in contact with and communicates with the liquid-conducting structure. The liquid-conducting structure can absorb the electrolyte at the first bending part, and promote the flow of the electrolyte from the first bending part through the liquid-conducting structure to the second bending part. . The second side is in contact with and communicates with the liquid-conducting structure, and the second bending part can absorb the electrolyte located in the liquid-conducting structure to promote the flow of the electrolyte from the first bending part through the liquid-conducting structure to the second bending part.

In some embodiments, there are multiple liquid-guiding structures, and the multiple liquid-guiding structures are arranged successively.

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

In yet another aspect, the present application provides an electric device, which includes the battery cell according to the above embodiment. The battery cells are used to provide electrical energy.

Description of drawings

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

FIG. 1 is a schematic diagram of a partial structure of a vehicle according to an embodiment of the present application;

2 is a schematic diagram of an exploded structure of a battery pack according to an embodiment of the present application;

3 is a schematic diagram of a partial structure of a battery according to an embodiment of the present application;

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

5 is a schematic diagram of an exploded structure of a battery cell according to an embodiment of the present application;

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 structural schematic diagram of the liquid guiding structure shown in Fig. 6;

Fig. 8 is a schematic structural view of an insulating member of a battery cell according to another embodiment of the present application;

Fig. 9 is a structural schematic diagram of the liquid guiding structure shown in Fig. 8;

In the drawings, the drawings are not necessarily drawn to scale.

Wherein, each reference sign in the figure:

X, height direction;

1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Box; 501. First box part; 502. Second box part; 503. Accommodating space; 6. Battery module; battery cell;

10. Electrode assembly;

11. The first bending part; 111. The first edge; 112. The third edge; 113. The first side;

12. The second bending part; 121. The second edge; 122. The fourth edge; 123. The second side;

13. Straight part; 14. Ear part; 15. Electrode body;

20. Shell components;

30. Housing; 31. Opening;

40. End cover assembly; 41. Electrode terminal;

50. End cover;

60. Insulation member; 611. Insulation part; 6111. Side part; 612. Accommodating part;

62. Liquid guiding structure; 621. Liquid guiding body; 6211. Connecting part; 6212. Second extending part; 622. First extending part;

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

Detailed ways

Embodiments of the present application will be further described in detail below with reference to the drawings and embodiments. The detailed description and drawings of the following embodiments are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise specified, the meaning of "plurality" is more than two; the terms "upper", "lower", "left", "right", "inner", " The orientation or positional relationship indicated by "outside" and so on are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to this application. Application Restrictions. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

The orientation words appearing in the following description are the directions shown in the figure, and do not limit the specific structure of the application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application. The battery cells may be flat, cuboid, or other shapes, which are not limited in the embodiments of the present application. The battery cells are generally divided into square and square battery cells and pouch battery cells according to the way of packaging, which is not limited in the embodiment of the present application.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, and the like. Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive pole piece, a negative pole piece and a separator. A battery cell works primarily by moving metal ions between the positive and negative pole pieces. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collector and a positive electrode lug protruding from the positive electrode current collector. part is coated with a positive electrode active material layer, and at least part of the positive electrode tab is not coated with a positive electrode active material layer. Taking a lithium-ion battery cell as an example, the material of the positive electrode current collector can be aluminum, the positive electrode active material layer includes the positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a negative electrode tab protruding from the negative electrode current collector, and the negative electrode current collector part is coated with a negative electrode active material layer, and at least part of the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes the negative electrode active material, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current is passed without fusing, the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together. The material of the spacer can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene). In addition, the electrode assembly may be a wound structure or a stacked structure, which is not limited in the embodiments of the present application.

The battery cell may also include a casing assembly, and the casing assembly has an accommodating chamber inside, and the accommodating chamber is a closed space provided by the casing assembly for the electrode assembly and the electrolyte. The shell assembly includes a shell and an end cover assembly. The end cover assembly includes an end cover. The shell is a hollow structure with one side open. The end cover covers the opening of the shell and forms a sealed connection to form an electrode assembly and Electrolyte holding chamber. The electrolyte may be an electrolytic solution, and the electrolytic solution plays a role of conducting ions between the positive pole piece and the negative pole piece.

The inventors found that during the recycling process of the battery cell, due to gravity, the electrolyte would accumulate at the bottom of the casing, resulting in sufficient wetting of the electrode assembly at the bottom by the electrolyte, and poor wetting of the electrode assembly far from the bottom. , the wettability of the electrolyte to the electrode assembly as a whole is not uniform. When lithium ions migrate in the electrode assembly away from the bottom, lithium ions may not be embedded in the negative electrode sheet due to the lack of electrolyte, which may precipitate on the surface of the negative electrode sheet as Lithium metal, on the one hand, the precipitation of lithium will cause the capacity of the battery cell to drop in the late cycle, which will deteriorate the cycle performance and is not conducive to high-rate charging; on the other hand, the precipitated metal lithium will easily develop into lithium dendrites, which may puncture the separator and cause Positive pole piece and negative pole piece are short-circuited, causing a safety risk.

In view of this, the inventor proposed a technical solution, in which a battery cell is provided, and the battery cell guides the electrolyte at the bottom of the casing to the The side of the shell facing away from the bottom allows the electrolyte to evenly infiltrate the electrode assembly, ensuring the smooth migration of lithium ions, ensuring the capacity and cycle performance of the battery cell, and improving its safety performance.

The technical solution described in the embodiments of the present application is applicable to a battery including a battery cell and an electric device using the battery.

Electric devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, and so on. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more. The embodiments of the present application do not impose special limitations on the above electric devices.

For the convenience of description, the following embodiments will be described by taking the electric device as a vehicle as an example.

As shown in FIG. 1 , a battery 2 is arranged inside the vehicle 1 , and the battery 2 can be arranged at the bottom, head or tail of the vehicle 1 . The battery 2 can be used for power supply of the vehicle 1 , for example, the battery 2 can be used as an operating power source of the vehicle 1 .

The vehicle 1 may also include a controller 3 and a motor 4 , the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

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

As shown in FIG. 2 , the battery 2 includes a box body 5 and a battery cell (not shown in FIG. 2 ), and the battery cell is accommodated in the box body 5 .

The box body 5 is used to accommodate the battery cells, and the box body 5 may have various structures. In some embodiments, the box body 5 may include a first box body part 501 and a second box body part 502, the first box body part 501 and the second box body part 502 cover each other, and the first box body part 501 and the second box body part 501 The two box parts 502 jointly define an accommodating space 503 for accommodating the battery cells. The second box part 502 can be a hollow structure with one end open, the first box part 501 is a plate-like structure, and the first box part 501 covers the opening side of the second box part 502 to form an accommodating space 503 The box body 5; the first box body portion 501 and the second box body portion 502 can also be a hollow structure with one side opening, and the opening side of the first box body portion 501 is covered on the opening side of the second box body portion 502 , to form a box body 5 with an accommodation space 503 . Certainly, the first box body part 501 and the second box body part 502 may be in various shapes, such as a cylinder, a cuboid, and the like.

In order to improve the airtightness after the first box body part 501 and the second box body part 502 are connected, a sealing member can also be arranged between the first box body part 501 and the second box body part 502, such as sealant, sealing ring, etc. .

Assuming that the first box part 501 covers the top of the second box part 502, the first box part 501 can also be called the upper box cover, and the second box part 502 can also be called the lower box.

In the battery 2, there may be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel or in parallel. The hybrid connection means that there are both series and parallel connections among the multiple battery cells. A plurality of battery cells can be directly connected in series or in parallel or mixed together, and then the whole composed of a plurality of battery cells is accommodated in the box 5; of course, it is also possible to first connect a plurality of battery cells in series or parallel or The battery modules 6 are formed by parallel connection, and multiple battery modules 6 are connected in series or in parallel or in series to form a whole, and are housed in the box body 5 .

As shown in FIG. 3 , in some embodiments, there are multiple battery cells, and the multiple battery cells are connected in series, in parallel, or in parallel to form a battery module 6 . A plurality of battery modules 6 are connected in series, in parallel or in parallel to form a whole, and accommodated in the box.

A plurality of battery cells in the battery module 6 can be electrically connected through a confluence component, so as to realize parallel connection, series connection or mixed connection of the plurality of battery cells in the battery module 6 .

As shown in FIG. 4 and FIG. 5 , the battery cell 7 provided by the embodiment of the present application includes an electrode assembly 10 and a casing assembly 20 , and the electrode assembly 10 is housed in the casing assembly 20 .

In some embodiments, housing assembly 20 may also be used to contain an electrolyte, such as electrolyte solution. Housing assembly 20 may be of various configurations.

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

The casing 30 may be a cuboid 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 casing can be selected.

In some embodiments, the end cover assembly 40 includes an end cover 50 , and the end cover 50 covers the opening 31 of the housing 30 . The end cap 50 can be of various structures, for example, the end cap 50 is a plate-shaped structure, a hollow structure with one end open, and the like. Exemplarily, in FIG. 4 , the housing 30 is a cuboid structure, and the end cover 50 is a plate-shaped structure, and the end cover 50 is closed at the opening 31 at the top of the housing 30 .

The end cap 50 can be made of insulating material (such as plastic) or conductive material (such as metal). When the end cap 50 is made of metal material, the end cap assembly 40 may further include an insulating member 60 located on a side of the end cap 50 facing the electrode assembly 10 to insulate the end cap 50 from the electrode assembly 10 .

In some embodiments, the end cover assembly 40 may further include an electrode terminal 41 installed on the end cover 50 . There are two electrode terminals 41, and the two electrode terminals 41 are respectively defined as a positive electrode terminal and a negative electrode terminal.

In some other embodiments, the housing assembly 20 can also be of other structures. For example, the housing assembly 20 includes a housing 30 and two end cover assemblies 40, the housing 30 is a hollow structure with openings 31 on opposite sides, and one end cover The assembly 40 is correspondingly covered with an opening 31 of the casing 30 and forms a sealed connection, so as to form an accommodating cavity for accommodating the electrode assembly 10 and the electrolyte. In this structure, one end cover assembly 40 may be provided with two electrode terminals 41 , while the other end cover assembly 40 may not be provided with electrode terminals 41 , or each of the two end cover assemblies 40 may be provided with one electrode terminal 41 .

In the battery cell 7 , there may be one electrode assembly 10 housed in the case assembly 20 or a plurality of them. Exemplarily, in FIG. 4 , there are four electrode assemblies 10 .

The electrode assembly 10 includes a positive pole piece, a negative pole piece and a separator. The electrode assembly 10 may be a wound electrode assembly, a laminated electrode assembly or other forms of electrode assemblies.

As shown in Figures 4 to 6, in some embodiments, the battery cell 7 includes a casing 30, an electrolyte, an electrode assembly 10, and an end cap assembly 40; at least one end of the casing 30 is provided with an opening 31, where the opening 31 is located. The plane is parallel to the height direction X of the battery cell 7; the electrolyte is accommodated in the casing 30; the electrode assembly 10 is accommodated in the casing 30; the end cap assembly 40 includes an end cap 50 and an insulating member 60, and the end cap 50 is used to cover the opening 31 to seal the casing 30, the insulating member 60 is located between the end cap 50 and the electrode assembly 10, the insulating member 60 includes a liquid-conducting structure 62, and the liquid-conducting structure 62 extends at least partially along the height direction X to guide electrolysis in the height direction X liquid.

When placing the battery cells 7, it can be considered that the height direction X of the battery cells 7 is parallel to the vertical direction. The casing 30 contains an electrolyte solution. Since the electrolyte solution does not completely fill the inner space of the casing 30 , the electrolyte solution only occupies part of the space of the casing 30 . Therefore, the electrolyte solution will flow to the bottom of the casing 30 under the action of gravity. The plane where the opening 31 of the casing 30 is located 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 arranged in the housing 30. In order to ensure the normal charging and discharging of the battery cells 7, the electrode assembly 10 needs to be soaked in the electrolyte, but in the height direction X, the part of the electrode assembly 10 located at the bottom of the housing 10 can be obtained Wetting of the electrolyte solution, but the part at the top of the housing 10 cannot be fully infiltrated by the electrolyte solution, resulting in insufficient wetting of the electrode assembly 10 in the height direction X.

The end cover assembly 40 includes an end cover 50 and an insulating member 60. The housing 30 generally has an opening 31. The end cover 50 can cover the opening 31, so that the housing 30 and the end cover assembly 40 form a sealed structure, reducing the risk of electrolyte leakage. risk. The insulating member 60 is located between the end cap 50 and the electrode assembly 10 to insulate the end cap 50 from the electrode assembly 10 and reduce the risk of a short circuit in direct contact between the end cap 50 and the electrode assembly 10 . Specifically, the insulating member 60 includes a liquid conducting structure 62 , at least a portion of the liquid conducting structure 62 extends along the height direction X, and can guide the electrolyte from low to high in the height direction X. The liquid-guiding structure 62 can be a diffuse drainage effect itself, such as a test paper; it can also be a member with a capillary effect (such as a hollow structure); or a through hole provided in the insulating member 60 (the through hole can also have a capillary effect); The electrolyte located at a low place can overcome gravity under capillary action, and flow to a high place along the opposite direction of gravity.

In the related art, due to gravity, the electrolyte will flow downward in the vertical direction, resulting in the electrolyte may accumulate in the lower part, while the electrolyte in the upper part is insufficient, and the closer to the upper part of the electrode assembly 10, the more likely it is to cause the risk of lithium precipitation. The lower the electrode assembly 10 is, the more stable the performance is, and the vertical performance of the electrode assembly 10 is not uniform.

However, the present application is provided with an insulating member 60, the insulating member 60 includes a liquid-conducting structure 62, and the insulating member 60 can insulate and separate the end cap 50 and the electrode assembly 10 to improve safety performance; the liquid-conducting structure 62 extends at least partially along the height direction X, Through the liquid-absorbing effect of the liquid-conducting structure 62, the electrolyte solution located at the lower place can flow to the upper part to infiltrate the electrode assembly 10, and the electrolyte solution can not only fully infiltrate the overall structure of the electrode assembly 10, but also improve the height direction X of the electrode assembly 10. The uniformity of performance makes it difficult for the battery cell 7 to undergo lithium precipitation during the cycle charge and discharge process, thereby reducing the capacity drop phenomenon caused by lithium precipitation, ensuring the cycle performance of the battery cell 7, and benefiting the battery cell. 7 high-rate charging, thereby improving the electrochemical performance of the battery cell 7; and can reduce the risk of shorting the positive pole piece and the negative pole piece caused by lithium dendrites caused by lithium analysis, and improve the safety performance of the battery cell 7 .

In some embodiments, the electrode assembly 10 includes an electrode body 15 and a tab portion 14 connected to the electrode body 15 and protruding from the electrode body 15 . In order to match the structure 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 body 15 of the electrode assembly 10. The receiving part 612 is connected to the insulating part 611 and opposite to the The insulating portion 611 is recessed toward a direction away from the electrode body 15 , and the accommodating portion 612 is used for accommodating the tab portion 14 ; the insulating portion 611 is provided with a liquid conducting structure 62 .

The insulating part 611 is a main insulating part of the insulating member 60 , which can insulate and separate the end cap 50 from the electrode assembly 10 , specifically, the insulating part 611 is used to insulate and separate the end cap 50 from the electrode body 15 of the electrode assembly 10 .

The accommodating portion 612 is in the form of a groove, and the specific direction of the depression is toward the direction away from the electrode body 15 of the electrode assembly 10. The accommodating portion 612 provides an accommodating space for the tab portion 14, and the tab portion 14 is accommodated in the accommodating portion 612. This facilitates the connection between the tab portion 14 and the electrode terminal 41 on the end cover 50 and other components. Certainly, the accommodating part 612 is not limited to the above-mentioned groove form, and it can also be provided in other structures and the like.

The liquid conducting structure 62 is arranged on the insulating part 611 , which can reduce the interference of other components such as the tab part 14 on the liquid conducting structure 62 and ensure the smooth progress of liquid absorption.

As shown in FIGS. 5 to 7 , in some embodiments, along the thickness direction of the electrode assembly 10 , the insulating portion 611 includes two side portions 6111 opposite to each other, at least one of the two side portions 6111 is provided with a conductive liquid structure62. Further, both side parts 6111 are provided with a liquid guiding structure 62 . In FIG. 6 , the Y direction represents the thickness direction of the electrode assembly 10 , and the Y direction is perpendicular to the height direction X, that is, the two side portions 6111 are opposite to each other along the Y direction.

The liquid guiding structure 62 is arranged on the side part 6111 of the insulating part 611, the liquid guiding structure 62 will not be interfered by the tab part 14 or the receiving part 612 basically, and the electrolyte solution located at a low position can be smoothly drained to a high position in the height direction X. place. The liquid-conducting structures 62 are provided on both side portions 6111 to improve the liquid-absorbing effect.

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

In some embodiments, the liquid guiding structure 62 is disposed in the insulating portion 611 and penetrates through the insulating portion 611 . It can be understood that the liquid guiding structure 62 is a through-hole structure opened in the insulating body 61 , and the through-hole structure has a capillary effect and can drain the electrolyte from a low place to a high place. The through hole can extend along a single direction, such as the height direction X; it can also extend along multiple directions, for example, a part of the through hole extends along the height direction X, and another part extends along a direction intersecting with the height direction X. The holes all pass through the insulating part 611 . This structural form is relatively simple, and because the path of the through hole is relatively short, it is beneficial to exert capillary action.

As shown in FIGS. 5 to 7 , as some examples, the liquid guiding structure 62 penetrates the insulating portion 611 along the height direction X. As shown in FIG. This type of structure can be understood as the liquid guide structure 62 is a through hole extending along the height direction X. This type of through hole structure is simpler, its flow path is relatively shorter, and the resistance of the electrolyte to rise is relatively small, which can further promote Capillary action.

As shown in FIGS. 5 to 9 , as some other examples, the liquid guiding structure 62 may include a liquid guiding body 621 and a first extension 622; at least part of the liquid guiding body 621 extends along the height direction X, and the liquid guiding body 621 penetrates the insulating The surface of the part 611; the first extension part 622 communicates with the liquid guide body 621, and the first extension part 622 penetrates the surface of the insulating part 611 facing the electrode assembly 10, and the first extension part 622 extends along the first direction, and the first direction and height The directions X intersect each other, wherein one of the first extension part 622 and the liquid guide body 621 can be used to absorb the electrolyte solution from a lower place, and the other can be used to discharge the absorbed electrolyte solution to a higher place. In the present application, the intersecting of the first direction and the height direction X means that the first direction is perpendicular to the height direction X, or the angle between the first direction and 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 the first direction, and the first direction Z, the height direction X and the Y direction are perpendicular to each other.

The liquid guiding structure 62 includes at least two parts, one is the liquid guiding body 621, and the other is the first extension 622, the first extension 622 extends along the first direction, and the first extension 622 is easier to connect with the electrode assembly located at the bottom 10 in direct contact, or in direct contact with the electrode assembly 10 located at a high place, which facilitates the absorption or flow of the electrolyte.

At least part of the liquid guiding body 621 extends along the height direction X, which includes many situations. In one case, all of the liquid guiding body 621 extends along the height direction X. In this case, one end of the liquid guiding body 621 needs to penetrate the insulating The surface of part 611. In another case, 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, and the connecting portion 6211 extends along the height direction. X extends, the connecting part 6211 communicates with the second extending part 6212 and the first extending part 622; the second extending part 6212 extends along the second direction, and is arranged opposite to the first extending part 622 along the height direction X, and the second extending part 6212 runs through The surface of the insulation part 611 facing the electrode assembly 10 . One of the first extension part 622 and the second extension part 6212 can be used to absorb the electrolyte solution located at a low place, and the other can be used to discharge the absorbed electrolyte solution to a high place. In this case, the second extension part The portion 6212 is more likely to be in direct contact with the part of the electrode assembly 10 located at the lower position, or directly contact with the part of the electrode assembly 10 located at the higher position, which facilitates the absorption or flow of the electrolyte. In the present application, the second direction intersecting the height direction X means that the second direction is perpendicular to the height direction X, or the angle between the second direction and 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 . It should be noted that the first direction may be parallel to or intersect with the second direction. In FIG. 9 , the first direction and the second direction are parallel, and both can be referred to as the Z direction.

Further, the connecting portion 6211 is located between the second extending portion 6212 and the first extending portion 622 , that is, the first extending portion 622 and the second extending portion 6212 communicate with two ends of the connecting portion 6211 respectively. Such a setting is more conducive to absorbing and discharging the electrolyte.

Exemplarily, the first extension part 622 can directly contact the first bent part 11 of the electrode assembly 10, the second extension part 6212 can directly contact the second bent part 12 of the electrode assembly 10, and the first extension part 622 can The electrolyte sucked at the first bending portion 11 flows to the second bending portion 12 through the connecting portion 6211 and the second extending portion 6212 . Certainly, the first extension portion 622 may also be in direct contact with the second bending portion 12 , and the second extension portion 6212 is in direct contact with the first bending portion 11 , and the flow direction of the electrolyte thereof is opposite to the above flow direction.

The above structural arrangement is more conducive to the liquid guiding structure 62 to absorb the electrolyte and achieve the purpose of circulating the electrolyte.

In some other embodiments, the liquid conducting structure 62 is connected to the side of the insulating portion 611 facing the electrode body 15 , and is formed to protrude toward the direction of the electrode assembly 10 relative to the insulating portion 611 . This structural form may be that the side of the liquid guiding structure 62 facing the insulating part 611 has a liquid-absorbing cavity, and the electrolyte flows through the liquid-absorbing cavity. Further, the liquid guiding structure 62 and the insulating part 611 can be an integrated structure, and of course, they can also be composed of independent structures.

In some other embodiments, the liquid conducting structure 62 is connected to the side of the insulating portion 611 facing the electrode body 15 , and the liquid conducting structure 62 is a hollow structure. This structural form can be understood as the liquid guiding structure 62 and the insulating part 611 are independent structures, the liquid guiding structure 62 is a hollow structure, and the electrolyte flows from the hollow structure, and flows from a low place to a high place. Further, the hollow structure is a cylindrical hollow structure, which is more conducive to the exertion of capillary action and improves the liquid absorption effect.

In this application, the electrode assembly 10 has various structural forms, and the electrode assembly 10 may be a wound electrode assembly or a stacked electrode assembly.

When the battery cell 7 adopts a laminated electrode assembly, the liquid-absorbing effect of the liquid-conducting structure 62 can drain the electrolyte at a lower position to a higher level, so that the overall wetting effect of the laminated electrode assembly 10 is relatively uniform, improving Performance of the electrode assembly 10 as a whole.

When the battery cell 7 adopts a wound-type electrode assembly, the wound-type electrode assembly has a flat structure, and the problem of insufficient electrolyte infiltration is likely to occur at its bend. The wound-type electrode assembly is placed on the shell along the height direction X Inside the body 30, the bending part is embodied as the first bending part 11 and the second bending part 12 of the electrode assembly 10 in the height direction X. The electrode assembly 10 also includes a straight part 13, and the straight part 13 is located at the first Between the bent part 11 and the second bent part 12, and connecting the first bent part 11 and the second bent part 12, in view of the electrode assembly 10 being a wound electrode assembly, the straight part 13, the first bent part The part 11 and the second bent part 12 are embodied as an integral structure. The straight portion 13, the first bent portion 11 and the second bent portion 12 are the electrode body 15 at the core of the electrode assembly 10, which is mainly used for electrochemical reactions to generate current, etc.; in order to generate the electrode body 15 of the electrode assembly 10 The electrode assembly 10 can also include a tab part 14, which is connected to the straight part 13, and the tab part 14 can draw out the current generated by the main body part, and can transfer the external current to the main part, so that The cycle charging and discharging of the battery cell 7 is realized.

In the height direction X, the second bent portion 12 is above the first bent portion 11; the first bent portion 11 includes a first edge 111 facing the straight portion 13, and the second bent portion 12 includes a first edge 111 facing the straight portion 13. The second edge 121 of the portion 13; at least part of the liquid guiding structure 62 extends along the height direction X, and extends downwards at least to the first edge 111, and upwards at least to the second edge 121, and will be located at the first edge 121 in the height direction X. The electrolyte in the bent portion 11 is led to the second bent portion 12 .

The electrode assembly 10 includes a first bent portion 11 and a second bent portion 12 opposite to each other along the height direction X. When both ends of the electrode assembly 10 are soaked in the electrolyte, the overall performance of the electrode assembly 10 can be guaranteed to be uniform. In the electrode assembly 10, the first bending part 11 has a partial structure of the positive electrode sheet, a partial structure of the negative electrode sheet and a partial structure of the separator, that is, it is an integral structure composed of the above three, and the adjacent There is a gap between the positive electrode piece and the separator, and there is also a gap between the adjacent negative electrode piece and the separator. In other words, there may be a gap in the inner space of the first bending part 11, which is conducive to absorbing and retaining electrolytic solution. liquid so that the electrolyte can infiltrate the first bending portion 11 . Similarly, the second bent portion 12 also has a partial structure of the positive pole piece, a partial structure of the negative pole piece, and a partial structure of the separator, that is, there may also be a void in the inner space of the second bent portion 12, and the space It is beneficial to absorb and retain the electrolyte, so that the electrolyte can infiltrate the second bending portion 12 . It should be noted that the first bent portion 11 in this application mainly means that after the battery cell 7 is placed, the bottom end of the electrode assembly 10 along the height direction X is defined as the first bent portion 11, and the electrode assembly 10 is defined as the first bent portion 11 along the height direction X. The top end of is defined as the second bent portion 12 . However, there is no essential difference in the structure of the first bending portion 11 and the second bending portion 12 , only to distinguish their positions in the height direction X.

At least a part of the liquid conducting structure 62 extends along the height direction X, and extends downward at least to the first edge 111, which can contact the electrolyte located at the first bending portion 11, and the liquid conducting structure 62 can place the liquid at the first bending portion The electrolyte at 11 is guided toward the second bent portion 12 and extends up to at least the second edge 121 , so that the electrolyte can flow to the second bent portion 12 and infiltrate the second bent portion 12 .

In this application, the electrolyte located at the first bending portion 11 may refer to the electrolyte located inside the first bending portion 11, or may refer to the electrolyte located around the first bending portion 11; The electrolyte at the second bending portion 12 may refer to the electrolyte located inside the second bending portion 12 , or may refer to the electrolyte located around the second bending portion 12 .

Through the liquid-absorbing effect of the liquid-conducting structure 62, the electrolyte at the first bending portion 11 can flow to the second bending portion 12, and the electrolyte can not only fully infiltrate the first bending portion 11, but also Fully infiltrate the second bent portion 12 to improve the uniformity of the performance of the electrode assembly 10 in the height direction X, so that the battery cell 7 is not prone to lithium deposition during the cycle charge and discharge process, thereby reducing the occurrence of lithium deposition due to lithium deposition. The capacity diving phenomenon ensures the cycle performance of the battery cell 7, which is beneficial to the high-rate charging of the battery cell 7, thereby improving the electrochemical performance of the battery cell 7; and can reduce the lithium dendrites caused by lithium analysis to cause the positive electrode The risk of short-circuiting between the pole piece and the negative pole piece improves the safety performance of the battery cell 7 .

In some embodiments, the first bent 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. As shown in FIG.

Along the height direction X, the liquid guiding structure 62 extends downward to the third edge 112; so that the liquid guiding structure 62 can fully drain the electrolyte located at the first bending part 11 to the second bending part 12, improving the stability of the second bending part 12. The wetting effect of the two bending parts 12 ensures the uniformity of the wetting effect of the electrode assembly 10 in the height direction X.

In some embodiments, the second bent portion 12 includes a fourth edge 122 away from the straight portion 13, and the liquid conducting structure 62 extends upwards to the fourth edge 122 along the height direction X; so that the liquid conducting structure 62 can fully transfer the electrolyte Draining the current to the second bent portion 12 achieves a better wetting effect on the second bent portion 12 , thereby ensuring the uniformity of the wetting effect of the electrode assembly 10 in the height direction X.

As shown in FIGS. 5 to 9 , in some embodiments, the liquid guiding structure 62 includes a liquid suction end 62a and a liquid outlet 62b. at the end of the discharge liquid.

The liquid suction end 62a is in contact with the first bending part 11, and the liquid guiding structure 62 can absorb the electrolyte at the first bending part 11, and promote the flow of the electrolyte from the first bending part 11 through the liquid guiding structure 62 to the second bending part 11. Bending part 12. Of course, the liquid suction end 62a may not be in direct contact with the first bent portion 11, and the electrolyte may also flow toward the liquid outlet end 62b under 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 this application, the length direction of the flat structure is perpendicular to the height direction X, and in FIG. 5 the length direction of the flat structure is parallel to the Z direction.

The liquid outlet 62b is in contact with and communicates with the second bent portion 12, the second bent portion 12 can absorb the electrolyte located in the liquid guiding structure 62, and promote the electrolyte to continue from the first bent portion 11 through the liquid guiding structure 62 Flow to the second bending part 12, the electrolyte located at the second bending part 12 may flow back to the first bending part 11 under the action of gravity, such flow is beneficial to the electrolyte solution between the first bending part 11 and the second bending part 11. The circulation between the folded parts 12 can ensure the wettability of the electrolyte solution to the electrode assembly 10 as a whole. For example, the liquid-guiding structure 62 absorbs liquid by capillary action, and the second bending part 12 directly contacts with the liquid outlet end 62b of the liquid-guiding structure 62 to absorb the electrolyte of the liquid-guiding structure 62, and the electrolyte in the liquid-guiding structure 62 flows to After the second bending part 12, it will continue to absorb liquid from the first bending part 11 to the second bending part 12 under capillary action, so that the electrolyte will flow to the second bending part 12 uninterruptedly. The two bending parts 12 are infiltrated. Of course, the liquid outlet 62b may not be in contact with the second bending portion 12. For example, the liquid outlet 62b of the liquid guiding structure 62 is higher than the second bending portion 12. Under capillary action, the electrolyte absorbed by the liquid guiding structure 62 The electrolytic solution flows out through the liquid outlet 62 b and 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, multiple liquid guiding structures 62 can be provided, and multiple liquid guiding structures 62 are arranged successively. The plurality of liquid guiding structures 62 are all used to guide the electrolyte located at the first bent portion 11 to the second bent portion 12 . Through the liquid absorption of multiple liquid guide structures 62, the liquid absorption effect can be improved, and the wetting effect of the electrolyte on the second bending part 12 can be further improved, so as to expect the wetting effect of the first bending part 11 and the second bending part 12 Uniformity, so that the performance of the electrode assembly 10 in the charging and discharging process is uniform.

Further, the plurality of liquid guiding structures 62 are arranged at intervals, so that the liquid absorption process among the plurality of liquid guiding structures 62 will basically not interfere, so that the liquid absorption process can be carried out stably. Certainly, a plurality of liquid-guiding structures 62 can also be arranged continuously, and this continuity can be reflected in the continuous arrangement of projections of a plurality of liquid-guiding structures 62 on the insulating part 611. For example, the liquid-guiding structures 62 can be hollow tubes, and multiple hollow tubes The projections of the tubes on the insulating part 611 are arranged continuously, that is, the hollow tubes are adjacent to each other, so as to reduce the space occupation rate.

As shown in Fig. 4, Fig. 5, Fig. 8 and Fig. 9, as a specific embodiment of the present application, the battery cell 7 includes a casing 30, an electrolyte, an electrode assembly 10 and an end cap assembly 40; the casing 30 contains the electrolyte; the electrode The assembly 10 is arranged in the casing 30. Along the height direction X of the battery cell 7, the electrode assembly 10 includes a first bent portion 11 and a second bent portion 12 opposite to each other. The second bent portion 12 is in the height direction X Located above the first bent portion 11; the first bent portion 11 includes a first edge 111 facing the second bent portion 12, and the second bent portion 12 includes a second edge 121 facing the first bent portion 11 The end cover assembly 40 includes an end cover 50 and an insulating member 60. The end cover 50 extends along the height direction X and is used to cover the housing 30 to seal the housing 30. The insulating member 60 includes a liquid-conducting structure 62. The insulating member 60 is located at Between the end cap 50 and the electrode assembly 10, at least part of the liquid conducting structure 62 extends along the height direction X, and extends downward to at least the first edge 111, and upward to at least the second edge 121, so as to The electrolyte at the first bending portion 11 is led to the second bending portion 12 so as to guide the electrolyte at the first bending portion 11 to the second bending portion 12 .

The liquid guiding structure 62 includes a liquid guiding body 621 and a first extension portion 622; the first extending portion 622 extends along the first direction and communicates with the first bending portion 11; the liquid guiding body 621 includes a connecting portion 6211 extending along the height direction X And the second extension 6212 extending along the second direction, the connecting portion 6211 is located between the second extension 6212 and the first extension 622, and communicates with the second extension 6212 and the first extension 622; the second extension 6212 It communicates with the second bent 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 extension part 622 is in contact with the first side 113 of the first bending part 11, and the electrolyte at the first bending part 11 can flow through the connecting part 6211 through the first extending part 622, and then flow from the connecting part 6211 to The second extension 6212, the second extension 6212 is in contact with the second side 123 of the second bending portion 12, the electrolyte can flow out from the second extension 6212 to the second bending portion 12, so that the electrolyte can The second bending part 12 is infiltrated, so that the infiltration performance of the electrode assembly 10 in the height direction is relatively uniform, and the risk of lithium deposition in the battery cell 7 is reduced during the cycle charging and discharging process of the battery cell 7, thereby ensuring that the battery cell 7 cycle performance and safety performance.

While the application has been described with reference to a preferred embodiment, various modifications may be made thereto and equivalents may be substituted for parts thereof without departing from the scope of the application, in particular, as long as there are no structural conflicts , the various technical features mentioned in each implementation manner can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (15)

1. A battery cell, characterized in that it comprises: The casing, at least one end is provided with an opening, and the plane where the opening is located is parallel to the height direction of the battery cells; an electrolyte contained in the housing; an electrode assembly housed in the casing; an end cover assembly, including an end cover and an insulating member, the end cover is used to cover the opening to seal the case, the insulating member is located between the end cover and the electrode assembly, the insulating member A liquid conducting structure is included that extends at least partially along the height direction to guide the electrolyte in the height direction. 2. The battery cell according to claim 1, wherein: The electrode assembly includes an electrode body and a tab part connected to the electrode body and protruding from the electrode body; The insulating member includes an insulating part and an accommodating part, the insulating part is located between the end cap and the electrode body, the accommodating part is connected with the insulating part and faces away from the electrode relative to the insulating part The direction of the main body is recessed, and the accommodating portion is used for accommodating the tab portion, Wherein, the insulating part is provided with the liquid conducting structure. 3. The battery cell according to claim 2, characterized in that, Along the thickness direction of the electrode assembly, the insulating portion includes two side portions opposite to each other, at least one of the two side portions has the liquid-conducting structure, and the thickness direction of the electrode assembly is the same as the The height direction is vertical. 4. The battery cell according to claim 3, characterized in that, The liquid guiding structure is provided on the two side parts. 5 . The battery cell according to claim 2 , wherein the liquid guiding structure is disposed in the insulating portion and penetrates through the insulating portion. 6 . 6 . The battery cell according to claim 5 , wherein the liquid guiding structure penetrates through the insulating part along the height direction. 7. The battery cell according to claim 5, wherein the liquid conducting structure comprises: a liquid guiding body extending at least partially along the height direction, and the liquid guiding body penetrates the surface of the insulating part; and The first extension part extends along a first direction, the first extension part communicates with the liquid guide body, and penetrates the surface of the insulating part facing the electrode assembly, the first direction is the same as the height direction intersect. 8. The battery cell according to claim 7, wherein the liquid guiding body comprises a connection portion and a second extension portion, the connection portion extends along the height direction and communicates with the first extension portion and the second extension portion. The second extension part, the second extension part extends along the second direction and is arranged opposite to the first extension part along the height direction, the second extension part passes through the insulating part facing the electrode A surface of the component, the second direction intersects the height direction. 9. The battery cell according to claim 2, wherein: The liquid conducting structure is a hollow structure, and the hollow structure is disposed on a side of the insulating part facing the electrode main body. 10. The battery cell according to any one of claims 1 to 9, wherein the electrode assembly is a flat structure, and the flat structure includes a straight part, a first bent part and a second bent part. Bending parts, the first bending part and the second bending part are located at both ends of the straight part along the height direction, and in the height direction, the second bending part is located at above the first bending portion; The first bent portion includes a first edge facing the straight portion, the second bent portion includes a second edge facing the straight portion, 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 according to claim 10, characterized in that, The first bent portion includes a third edge away from the straight portion, and the liquid guiding structure extends downwards to the third edge along the height direction; and/or The second bent portion includes a fourth edge away from the straight portion, and the liquid guiding structure extends upwards to the fourth edge along the height direction. 12. The battery cell according to claim 10, characterized in that, Along the length direction of the flat structure, the first bent portion includes two first sides opposite to each other, and the first sides are in contact with the liquid guiding structure; and/or Along the length direction of the flat structure, the second bent portion includes two second side faces opposite to each other, and the second side faces are in contact with the liquid guiding structure. 13. The battery cell according to any one of claims 1 to 9, characterized in that there are multiple liquid conducting structures, and the multiple liquid conducting structures are arranged successively. 14. A battery, comprising the battery cell according to any one of claims 1 to 13. 15. An electrical device, characterized by comprising the battery according to claim 14, the battery being used to provide electrical energy.

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