CN220341484U

CN220341484U - Battery monomer, battery package and power consumption device

Info

Publication number: CN220341484U
Application number: CN202321212714.XU
Authority: CN
Inventors: 於洪将; 陈继程; 魏磊; 王汭
Original assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2023-05-18
Filing date: 2023-05-18
Publication date: 2024-01-12
Anticipated expiration: 2033-05-18

Abstract

The embodiment of the application provides a battery monomer, a battery pack and an electricity utilization device, and relates to the technical field of batteries. The battery cell includes: the shell is provided with openings at one end or two ends along the first direction, and the extending direction of the shell is the first direction; a cover plate closing the opening to form a receiving space; the battery cell is arranged in the accommodating space, and at least one end of the battery cell is arranged at intervals with the cover plate; the liquid suction block is fixed on the cover plate and is abutted with the battery cell; the electrolyte is filled in the accommodating space, the liquid absorbing block can absorb the electrolyte, and the electrolyte can be convenient to infiltrate the battery core, so that the rate performance, the charge and discharge capacity and the service life of the battery are guaranteed.

Description

Battery monomer, battery package and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a battery cell, a battery pack and an electric device.

Background

In a conventional power battery, an electric core is arranged in a shell, and electrolyte is filled in the electric core to realize electrochemical reaction. In order to design balance, the filling amount of the free electrolyte in the battery shell is preset, and the whole battery shell is not filled, so that the electrolyte is prevented from overflowing, and the cost is controlled.

At present, when the power battery is designed or used, various conditions such as standing, lying on one side, inversion, tilting and the like exist, even the condition of shaking up and down exists, the battery core is easy to crash due to vibration, potential safety hazards are formed, in addition, when the battery is inverted and the top cover is downward, free electrolyte can be deposited on the top cover under the action of gravity, and due to the fact that a space exists between the top cover and the battery core, the electrolyte is not contacted with the battery core, so that the electrolyte cannot infiltrate the battery core, the resistance is increased, and the multiplying power performance, the charge-discharge capacity and the service life of the battery are affected.

Disclosure of Invention

The purpose of this application includes, for example, provides a battery monomer, battery package and power consumption device, and it can be convenient for electrolyte infiltration electric core to guarantee battery multiplying power performance, charge-discharge capacity and life.

Embodiments of the present application may be implemented as follows:

embodiments of the present application provide a battery cell, comprising:

the shell is provided with openings at one end or two ends along the first direction, and the extending direction of the shell is a first direction;

the cover plate seals the opening to form a containing space;

the battery cell is arranged in the accommodating space, and at least one end of the battery cell is arranged at intervals with the cover plate;

the liquid suction block is fixed on the cover plate and is abutted with the battery cell;

the accommodating space is filled with electrolyte, and the liquid suction block can absorb the electrolyte.

Optionally, the imbibition piece is a plurality of, and a plurality of imbibition piece interval sets up on the apron.

Optionally, the nearest distance between the outer surface of the liquid absorbing block and the edge of the cover plate is 1-5mm.

Optionally, an explosion-proof valve and a plastic part are arranged on the cover plate, and the nearest distance between the outer surface of the liquid suction block and the outer surface of the explosion-proof valve or the plastic part is 0.5-1mm.

Optionally, the liquid absorbing block is made of elastic materials, and is compressed in an assembled state, and the compression amount of the liquid absorbing block is 0.1-0.5mm.

Optionally, the liquid absorbing block has a first section and a second section parallel to the cover plate, the first section is closer to the cover plate than the second section, and the projection of any one of the second sections on the cover plate completely falls into the projection of any one of the first sections on the cover plate.

Optionally, the liquid absorption block is of a porous structure, and the porosity of the liquid absorption block is 40% -95%.

Optionally, the material of the liquid absorbing block is sponge.

The embodiment of the application also provides a battery pack, which comprises a box body and the battery monomer.

The embodiment of the application also provides an electric device which comprises the battery pack.

The beneficial effects of the battery monomer, the battery pack and the power utilization device of the embodiment of the application include, for example: in order to facilitate electrolyte to infiltrate the battery core, the battery core and the electrolyte are arranged in the accommodating space formed by the cover plate and the shell, the liquid absorption block is arranged between the battery core and the cover plate, the liquid absorption block can absorb free electrolyte in the accommodating space, so that more electrolyte is absorbed by the liquid absorption block and is used for being in contact with the battery core to infiltrate the battery core, the infiltration degree of the battery core is improved, the battery adopts a mode of horizontally placing and laterally placing even inverting, the liquid absorption block can absorb free electrolyte and infiltrate the battery core, the utilization rate of the electrolyte in the battery is improved, and the multiplying power performance, the charge-discharge capacity and the service life of the battery are guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a cross-sectional view of a battery cell according to an embodiment of the present application;

FIG. 2 is a partial structural cross-sectional view of a battery cell according to an embodiment of the present application;

fig. 3 is a schematic view of a first arrangement of absorbent blocks in an embodiment of the present application;

fig. 4 is a schematic view of a second arrangement of absorbent blocks in an embodiment of the present application;

fig. 5 is a schematic diagram showing a first shape of a wicking block in an embodiment of the application;

fig. 6 is a schematic diagram showing a second shape of the wicking block in an embodiment of the application.

Icon: 100-cover plate; 110-explosion-proof valve; 120-plastic parts; 200-a housing; 210-accommodating space; 300-cell; 400-imbibition block; 500-pole; 600-turn tab.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, if the terms "upper," "lower," "inner," "outer," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present application and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

It should be noted that, without conflict, features in embodiments of the present application may be combined with each other.

The inventors of the present application found that in order to design a balance, the filling amount of the free electrolyte inside the battery case is preset, and the whole battery case is not filled, so that the overflow of the electrolyte is avoided and the cost is controlled. When the battery is laid on one side and inverted, particularly when the battery is inverted, free electrolyte can be deposited on the top cover under the action of gravity, and because a space exists between the top cover and the battery core, the electrolyte is not contacted with the battery core, so that the electrolyte cannot infiltrate the battery core, the resistance is increased, and the multiplying power performance, the charge-discharge capacity and the service life of the battery are affected. The embodiment of the application provides a battery cell, which at least can solve the technical problems.

Referring to fig. 1 to 4, a battery cell provided in an embodiment of the present application includes a cover plate 100, a housing 200, a cell 300, and a liquid suction block 400; the extending direction of the housing 200 is a first direction, one end or two ends of the housing along the first direction are provided with openings, and the cover plate 100 seals the openings of the housing 200 to form a containing space 210; the battery cell 300 is arranged in the accommodating space 210, and at least one end of the battery cell 300 is arranged at intervals with the cover plate 100; the imbibition piece 400 is fixed on the apron 100, and the one end of imbibition piece 400 is connected with apron 100, and the other end and the electric core 300 butt of imbibition piece 400, through the absorption effect of imbibition piece 400 to the electrolyte, makes the electrolyte can infiltrate the electric core 300 that contacts with imbibition piece 400, improves the infiltration effect of electric core 300 to the electrolyte.

It should be noted that, the electric core 300 is disposed in the accommodating space 210 formed by connecting the cover plate 100 with the housing 200, the cover plate 100 is provided with the pole 500, the pole 500 extends into the gap between the cover plate 100 and the electric core 300 and is connected with the tab of the electric core 300 through the switching piece 600, so as to realize the electric connection between the electric core 300 and the outside, the liquid absorbing block 400 is disposed in the gap between the cover plate 100 and the electric core 300, and the liquid absorbing block 400 contacts with the electric core 300, and the liquid absorbing block 400 can absorb the electrolyte free in the accommodating space 210 so as to transfer the electrolyte to the electric core 300 far away from the electrolyte, thereby realizing the infiltration of the electric core 300 to the electrolyte.

In order to facilitate electrolyte to infiltrate the battery cell 300, the electrolyte is deposited on the cover plate 100 under the action of gravity when the cover plate 100 is downward arranged in the accommodating space 210 formed by the cover plate 100 and the shell 200, namely in a gap between the cover plate 100 and the battery cell 300, and when the electrolyte is at least partially far away from the battery cell 300, the electrolyte deposited on the cover plate 100 can be adsorbed by the electrolyte block 400 connected with the cover plate 100, so that more electrolyte is absorbed by the electrolyte block 400 and is used for being contacted with the battery cell 300 to infiltrate the battery cell 300, the infiltration degree of the battery cell 300 is improved, the utilization rate of the electrolyte in the battery is improved, and the rate performance, the charge-discharge capacity and the service life of the battery are ensured.

It should be noted that, the case where the battery is inverted and the cover plate 100 is disposed downward is not limited to the case where the cover plate 100 is disposed horizontally downward, and may include the case where the cover plate 100 is disposed obliquely downward, as long as the electrolyte is in contact with the liquid suction block 400 disposed on the cover plate 100, which is included in the scope of the present application.

In some embodiments, the battery cell 300 is inverted, the cover plate 100 is disposed at an opening of the casing 200 near one end of the pole 500, the cover plate 100 near the pole 500 is disposed horizontally downward, the liquid suction block 400 is disposed on the cover plate 100 near the pole 500, the electrolyte is completely deposited in a gap between the cover plate 100 and the battery cell 300, the battery cell 300 is far away from the electrolyte, the liquid suction block 400 is in contact with the top end of the battery cell 300, and free electrolyte adsorbed in the liquid suction block 400 can contact the battery cell 300 through the liquid suction block 400, so that the battery cell 300 is soaked, and the situation that the battery cell 300 cannot be soaked with the electrolyte due to too little electrolyte and too large gap between the cover plate 100 and the battery cell 300 is avoided. Because electrolyte can be reduced along with the use of the battery, the contact possibility of the electrolyte and the battery 300 is improved through the contact of the liquid absorbing block 400 with the battery 300, and even if the electrolyte is little, the infiltration of the battery 300 can be realized, so that the service life of the battery is prolonged.

In some embodiments, the battery 300 is upright, at this time, the cover plate 100 may be disposed at an opening at one end of the housing 200 away from the pole 500, the cover plate 100 away from the pole 500 is disposed horizontally downward, the liquid suction block 400 is disposed on the cover plate 100 away from the pole 500, the electrolyte is completely deposited in a gap between the cover plate 100 and the battery 300, the liquid suction block 400 contacts with the bottom end of the battery 300, and the free electrolyte adsorbed in the liquid suction block 400 may contact with the battery 300 through the liquid suction block 400, so as to infiltrate the battery 300.

In some embodiments, the battery 300 is disposed on the side or obliquely, two ends of the housing 200 along the first direction are both provided with openings, and two openings are respectively provided with one cover plate 100, and at this time, the pole 500 may be disposed at one cover plate 100, or the pole 500 may be disposed at two cover plates 100 at the same time, so long as a gap is ensured between the cover plate 100 and the battery 300 to accommodate the liquid absorbing block 400. The two cover plates 100 are respectively provided with a liquid absorption block 400, and the liquid absorption blocks 400 on the two cover plates 100 absorb free electrolyte and respectively infiltrate the top end and the bottom end of the battery cell 300.

In an alternative embodiment, the wicking block 400 is removably attached to the cover plate 100. By detachably connecting the liquid suction block 400 with the cover plate 100, the liquid suction block 400 is easily disassembled and replaced.

For example, the liquid absorbing block 400 is fixed to the cover plate 100 by an adhesive manner, or the liquid absorbing block 400 is fixed to the cover plate 100 by a clamping manner, however, it is understood that other manners of detachably connecting the liquid absorbing block 400 to the cover plate 100 are also within the scope of the present application.

In an alternative embodiment, the plurality of liquid absorbing blocks 400 are provided, and the plurality of liquid absorbing blocks 400 are spaced apart from the cover plate 100, and the nearest distance between the outer surface of the liquid absorbing block 400 and the edge of the cover plate 100 is 1-5mm.

For example, the plurality of liquid absorbing blocks 400 are detachably disposed at the middle and two ends of the cover plate 100 along the length direction of the cover plate 100, the distance between the liquid absorbing block 400 at one end of the cover plate 100 and the long side and the wide side of the cover plate 100 is 1-5mm, and the distance between the liquid absorbing block 400 at the middle of the cover plate 100 and the long side of the cover plate 100 nearest to the liquid absorbing block 400 is 1-5mm.

It should be noted that, the cover plate 100 is rectangular, and the liquid absorbing blocks 400 are disposed in the middle of the cover plate 100 and at both ends of the cover plate 100; the liquid suction block 400 positioned at one end of the cover plate 100 is in a strip shape, the width direction of the liquid suction block 400 positioned at one end of the cover plate 100 is consistent with the length direction of the cover plate 100, the distance between the wide side of the liquid suction block 400 and the long side of the cover plate 100 is 1-5mm, and the distance between the long side of the liquid suction block 400 and the wide side of the cover plate 100 is 1-5mm; the middle part of the cover plate 100 is provided with an explosion-proof valve 110, the middle part of the cover plate 100 is provided with a plurality of liquid suction blocks 400 around the explosion-proof valve 110, and the distance between any one liquid suction block 400 of the plurality of liquid suction blocks 400 and the long side of the cover plate 100 closest to the liquid suction block 400 is 1-5mm.

The distance between the liquid suction block 400 at one end of the cover plate 100 and the long side and the wide side of the cover plate 100 and the distance between the liquid suction block 400 at the middle of the cover plate 100 and the long side of the cover plate 100 closest to the liquid suction block 400 can be determined according to actual working conditions; for example, the distance between the liquid suction block 400 located at one end of the cover plate 100 and the long side and the wide side of the cover plate 100 is 1mm, 3mm or 5mm, and the distance between the liquid suction block 400 located at the middle of the cover plate 100 and the long side of the cover plate 100 nearest to itself is 1mm, 3mm or 5mm. Through the setting of the distance, the size of the liquid suction block 400 is ensured, the interference of the liquid suction block 400 to the connection of the cover plate 100 and the shell 200 is avoided, and meanwhile, the convenience of inserting the cover plate 100 connected with the liquid suction block 400 into the shell 200 is improved.

In an alternative embodiment, the cover plate 100 is further provided with an explosion-proof valve 110 and a plastic member 120, and the liquid absorbing block 400 covers the cover plate area outside the explosion-proof valve 110 and the plastic member 120.

It should be noted that, the areas of the surface of the cover plate 100 facing the battery core 300 except the explosion-proof valve 110 and the plastic part 120 are all provided with the liquid absorbing blocks 400, and the liquid absorbing blocks 400 may be formed by splicing a plurality of liquid absorbing blocks 400, or may be a single liquid absorbing block 400; by arranging the liquid absorption block 400 in this way, the space can be utilized to the greatest extent, the absorption area of the liquid absorption block 400 is increased, and the infiltration degree of the battery cell 300 is further increased; in addition, inclined surfaces are provided around the circumference of the liquid suction block 400 to facilitate assembly.

The distance between the edge of the plastic member 120 and the edge of the post 500 or the edge of the adapter piece 600 is 2-20mm according to the size of the battery, so as to secure the insulation effect.

In an alternative embodiment, the closest distance between the outer surface of the liquid absorbent block 400 and the outer surface of the explosion proof valve 110 or plastic 120 is 0.5-1mm. Namely, gaps are arranged between the liquid suction block 400 and the explosion-proof valve 110 and between the liquid suction block and the plastic part 120, and the width of the gaps is 0.5-1mm.

It should be noted that, a gap is provided between the liquid suction block 400 and the explosion-proof valve 110, and a gap is provided between the liquid suction block 400 and the plastic part 120, and by setting the gap and controlling the gap width to be 0.5-1mm, on one hand, the liquid suction block 400 can be ensured to have a larger adsorption area, on the other hand, the assembly can be convenient, and displacement interference is avoided.

In an alternative embodiment, the liquid absorbing block 400 is made of an elastic material, the thickness of the liquid absorbing block 400 in a free state is 2-20mm, and the liquid absorbing block 400 is compressed in an assembled state, and the compression amount of the liquid absorbing block 400 is 0.1-0.5mm.

It should be noted that, according to the size of the battery, the length of the liquid absorbing block 400 is 2mm-100mm, the width is 1mm-50mm, the thickness direction of the liquid absorbing block 400 is consistent with the thickness direction of the cover plate 100, the liquid absorbing block 400 is in a free state before the cover plate 100 is assembled with the housing 200, and the thickness of the liquid absorbing block 400 is 2-20mm; after the cover plate 100 is assembled with the shell 200, the liquid suction block 400 is in a compressed state, and the thickness of the liquid suction block 400 is smaller than that in a free state, so that the supporting strength of the liquid suction block 400 and the battery cell 300 is ensured, and the infiltration effect of the liquid suction block 400 and the battery cell 300 is improved; in addition, since the liquid suction block 400 has a certain elastic force when in a compressed state, the battery cell 300 can be prevented from vibrating; in addition, when the battery cell 300 is increased due to dislocation of the pole pieces, the battery cell 300 can be accommodated in a space due to the compressible characteristic of the liquid absorption block 400, so that the battery cell 300 is prevented from being crushed.

For example, the thickness of the liquid absorbent pad 400 in the free state is 10mm, and the thickness of the liquid absorbent pad 400 in the compressed state is 9.5mm. The thickness of the liquid absorbing block 400 in the free state can be reasonably selected according to the actual working conditions.

Referring to fig. 5 and 6, in an alternative embodiment, the liquid absorbing block 400 has a first section parallel to the cover plate 100 and a second section, the first section is closer to the cover plate 100 than the second section, and the projection of any second section on the cover plate 100 completely falls into the projection of any first section on the cover plate 100. In this manner, the cross-sectional area of the liquid-absorbing pad 400 is ensured to be gradually smaller in a direction away from the cover plate 100.

Optionally, the shape of the liquid-absorbing block 400 is a polygonal table, at least one side of the liquid-absorbing block 400 adjacent to the edge of the cover plate 100 is inclined inward in a direction away from the cover plate 100, wherein the angle of inclination is 60-90 °.

The inclination angle of the inclined surface of the liquid suction block 400 is the angle between the inclined surface and the surface of the cover plate 100 facing the battery cell 300.

For example, the shape of the liquid absorbing block 400 is a quadrangular frustum, three sides of the liquid absorbing block 400 are inclined inwards in a direction away from the cover plate 100, or four sides of the liquid absorbing block 400 are inclined inwards in a direction away from the cover plate 100, so that the cover plate 100 and the shell 200 are conveniently assembled, and the liquid absorbing block 400 and the shell 200 are prevented from interfering to influence the assembly efficiency; preferably, the liquid suction blocks 400 near both ends of the cover plate 100 in the length direction are provided in a multi-prismatic table structure, and since the liquid suction blocks 400 are provided with inclined surfaces, the cover plate 100 is assembled with the case 200.

In an alternative embodiment, the wicking block 400 is a porous structure, and the porosity of the wicking block 400 is 40% -95%.

By defining the porosity of the imbibition block 400 to be within the range of 40% -95%, the imbibition block 400 can have a good adsorption effect on the electrolyte which is dissociated in the accommodating space 210 in the porosity range so as to infiltrate the cell 300. Of course, the porosity of the liquid absorption block 400 may be 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, etc., and the liquid absorption block 400 having different porosities may be selected according to the cell size, the number of clicks, etc.

The liquid absorbing block 400 is made of a sponge, for example, the liquid absorbing block 400 is made of one of polyurethane sponge, imitation polyurethane sponge, MR mesh sponge, regenerated sponge, random hole sponge and polyester fiber sponge.

It should be noted that, the material of the liquid absorbing block 400 is hard sponge, and the compressible hard sponge is directly attached to the cover plate 100, so that the porous structure of the hard sponge can be utilized to absorb more electrolyte, and a certain damping effect can be achieved, even when the battery is inverted, the electrolyte can be absorbed and the winding core is infiltrated through the porous absorption characteristic of the hard sponge, so that the service life of the battery is prolonged; and more electrolyte can be released to wet the cell 300 when the wicking block 400 is in a compressed state.

The embodiment of the application also provides a battery pack, which comprises a box body and the battery monomer, wherein the battery monomer is arranged in the box body.

The embodiment of the application also provides an electric device, wherein the battery pack is used as all or part of power sources.

Such electrical devices include, but are not limited to, automobiles, boats, and spacecraft. The automobile can be a fuel oil automobile, a fuel gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like; spacecraft include airplanes, rockets, space planes, spacecraft, and the like. The embodiment of the application does not limit the electric device in particular.

In summary, in order to facilitate the electrolyte to infiltrate the battery 300, the embodiment of the application provides a battery cell, a battery pack and an electric device, in which, in order to set the liquid absorption block 400 in the accommodating space 210 formed by the cover plate 100 and the housing 200, the liquid absorption block 400 is located in the gap between the battery 300 and the cover plate 100, the liquid absorption block 400 can absorb the free electrolyte in the gap between the battery 300 and the cover plate 100, so that more electrolyte is absorbed by the liquid absorption block 400 and is used for contacting with the battery 300 to infiltrate the battery 300, the infiltration degree of the battery 300 is improved, so that the battery adopts a mode of horizontally placing, laterally placing, even inverting and inclining, the liquid absorption block 400 can also absorb the free electrolyte and infiltrate the battery 300, and the utilization rate of the electrolyte in the battery is improved, thereby guaranteeing the rate performance, the charge-discharge capacity and the service life of the battery.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery cell, comprising:

a housing (200), wherein the extending direction of the housing (200) is a first direction, and one end or two ends of the housing (200) along the first direction are provided with openings;

a cover plate (100), the cover plate (100) closing the opening to form a receiving space (210);

the battery cell (300), the said battery cell (300) is set up in the said accommodation space (210), at least one end of the said battery cell (300) and said cover plate (100) interval arrangement; the method comprises the steps of,

the liquid suction block (400) is fixed on the cover plate (100) and is abutted with the battery cell (300);

wherein, the accommodating space (210) is filled with electrolyte, and the liquid suction block (400) can absorb the electrolyte;

the liquid absorbing block (400) is provided with a first section and a second section which are parallel to the cover plate (100), the first section is closer to the cover plate (100) than the second section, the projection of any one of the second sections on the cover plate (100) completely falls into the projection of any one of the first sections on the cover plate (100), and the cross section area of the liquid absorbing block (400) is gradually reduced along the direction away from the cover plate (100).

2. The battery cell according to claim 1, wherein the plurality of liquid absorbing blocks (400) are provided, and the plurality of liquid absorbing blocks (400) are arranged on the cover plate (100) at intervals.

3. The battery cell according to claim 2, wherein a closest distance between an outer surface of the liquid suction block (400) and an edge of the cap plate (100) is 1-5mm.

4. The battery cell according to claim 1, wherein the cover plate (100) is provided with an explosion-proof valve (110) and a plastic part (120), and the closest distance between the outer surface of the liquid suction block (400) and the outer surface of the explosion-proof valve (110) or the plastic part (120) is 0.5-1mm.

5. The battery cell according to claim 1, wherein the liquid-absorbing block (400) is made of an elastic material, the liquid-absorbing block (400) is compressed in an assembled state, and the compression amount of the liquid-absorbing block (400) is 0.1-0.5mm.

6. The battery cell according to claim 1, wherein the liquid-absorbing block (400) has a porous structure, and the porosity of the liquid-absorbing block (400) is 40% -95%.

7. The battery cell according to claim 6, wherein the liquid absorbing block (400) is made of a sponge.

8. A battery pack comprising a case and the battery cell of any one of claims 1-7.

9. An electrical device comprising the battery pack of claim 8.