CN219476917U - Battery monomer and battery and power utilization device with same - Google Patents

Abstract

The utility model discloses a battery monomer, a battery with the battery monomer and an electricity utilization device, wherein the battery monomer comprises the following components: the surface of one side of the end cover, which is away from the battery cell, is a first surface, and at least one concave part is formed on the first surface; the isolating piece is arranged on one side of the end cover, which is away from the battery cell, and covers the concave part. According to the battery cell, the concave part of the end cover is covered by the isolation sheet, so that foreign matters, dust and other impurities can be prevented from entering the concave part to influence the appearance of the battery cell; the electrolyte sprayed in the liquid injection process can be effectively prevented from flowing to the concave part, and then electrolyte crystallization can be prevented from being left in the concave part, so that the problems of short circuit and untidy appearance of the battery monomer caused by electrolyte residues can be effectively reduced, and the appearance neatness and reliability of the battery monomer are improved.

Description

Battery monomer and battery and power utilization device with same

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery with the battery monomer and an electric device.

Background

When the existing battery is filled with electrolyte, the splashed electrolyte easily flows to the pit of the outer side surface of the end cover, and when the battery is cleaned, the electrolyte in the pit is difficult to clean completely, so that the electrolyte can be left, and the remaining electrolyte can cause other safety problems such as poor appearance of the battery or short circuit of a battery system.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a battery monomer which can effectively prevent the electrolyte sprayed in the liquid injection process from flowing to the concave part, and further can prevent the electrolyte from crystallizing in the concave part, thereby effectively reducing the problems of short circuit and untidy appearance of the battery caused by the residual electrolyte and improving the appearance neatness and reliability of the battery.

The utility model also provides a battery with the battery cell.

The utility model also provides an electric device with the battery cell.

The battery cell according to the first aspect of the present utility model includes: the surface of one side of the end cover, which is away from the battery cell, is a first surface, and at least one concave part is formed on the first surface; the isolating sheet is arranged on one side of the end cover, which is away from the battery cell, and covers the concave part; and the pressure relief mechanism is arranged at the position of the mounting hole.

According to the battery cell, the concave part of the end cover is covered by the isolation sheet, so that foreign matters, dust and other impurities can be prevented from entering the concave part to influence the appearance of the battery; the electrolyte sprayed in the liquid injection process can be effectively prevented from flowing to the concave part, and then electrolyte crystallization can be prevented from being left in the concave part, so that the problems of short circuit and untidy appearance of the battery caused by electrolyte residues can be effectively reduced, and the appearance neatness and reliability of the battery are improved. In addition, by arranging the pressure release mechanism, the internal pressure can be released when the internal pressure or the temperature of the battery cell reaches a threshold value, so that dangerous accidents such as explosion of the battery cell caused by excessively fast pressurization in the battery cell can be prevented; meanwhile, the pressure release mechanism is arranged in the mounting hole, so that the mounting position of the pressure release mechanism can be limited, and the mounting convenience of the pressure release mechanism is improved; in addition, the upper sealing cover of the mounting hole is provided with a separation sheet, the separation sheet can separate the pressure release mechanism and the external environment, and then electrolyte and other impurities can be prevented from falling into the mounting hole, so that the reliability of the pressure release mechanism can be improved, the normal use of the pressure release mechanism can be met, and the overall safety of the battery cell can be improved.

In some embodiments, the number of the concave portions is a plurality, at least one concave portion is formed into a groove, the groove and the mounting hole are arranged at intervals, a side surface of the end cover facing the battery cell is a second surface, a supporting structure is formed on the end cover, the supporting structure protrudes from the first surface towards the second surface, the supporting structure is formed into a supporting convex column on one side where the first surface is located, the groove is limited on one side where the second surface is located, and the supporting convex column is formed on one side where the second surface is located.

In the embodiment, the first surface is recessed towards the second surface, and the supporting convex columns formed on the second surface are used as the supporting structures, so that the supporting structures can be formed on the basis of not additionally adding other parts, the use of the parts can be reduced, and the production cost is reduced; meanwhile, the weight of the end cover can be reduced, and the weight of the battery monomer can be further reduced. In addition, the support structure can also prevent the switching piece from deforming to block the exhaust channel due to the impact of gas or heat in the battery cell, so that the pressure release effect of the pressure release mechanism is improved, and the situation of shell explosion caused by thermal runaway of the battery cell is reduced; simultaneously, the supporting structure can also increase the supporting strength of the end cover, and then the impact resistance of the battery cell can be increased. In addition, the spacing block that covers at bearing structure's recess end can prevent impurity and electrolyte entering recess, leaves electrolyte crystallization and other impurity in the effective prevention recess, and then can effectively reduce the problem that the battery monomer is short-circuited and the outward appearance is untidy because of the residual system that causes of electrolyte to can improve battery monomer outward appearance neatly nature and whole reliability.

In some embodiments, the number of support structures is a plurality, the plurality of support structures being spaced apart circumferentially of the pressure relief mechanism.

According to the embodiment, the plurality of supporting structures are arranged, so that the periphery of the pressure release mechanism can be supported to form an exhaust space, the pressure release effect of the pressure release mechanism can be further improved, and the situation that the shell is burst due to thermal runaway of the battery cell is reduced.

In some embodiments, the number of support structures is two, two of the support structures being arranged on opposite sides of the mounting hole in a radial direction.

This embodiment can also reduce bearing structure's setting when satisfying pressure release mechanism exhaust smoothly through setting up two bearing structure, and then can reduce the quantity of depressed part, reduction in production cost.

In some embodiments, the first surface is provided with a positioning groove, the recess is formed on the bottom wall of the positioning groove, and the spacer is disposed in the positioning groove.

According to the embodiment, the positioning groove is arranged, so that the spacing is carried out on the spacing piece, the spacing piece can be effectively prevented from being deviated, and the installation accuracy and the installation stability of the spacing piece can be further improved.

In some embodiments, the number of the positioning grooves is at least one, at least one concave portion is arranged in each positioning groove, and the number of the isolating sheets corresponds to the positioning grooves one by one.

According to the embodiment, the number of the positioning grooves is identical to that of the concave parts through the arrangement of the at least one positioning groove, and the number of the positioning grooves is smaller than that of the concave parts, so that the number of the positioning grooves and the isolation sheets can be freely selected according to the arrangement positions of the concave parts on the end cover, and the adaptability of the positioning grooves and the isolation sheets can be improved.

In some embodiments, a surface of the spacer facing away from the bottom wall of the positioning groove is flush with the first surface.

According to the embodiment, the surface of one side of the isolation sheet, which is away from the bottom wall of the positioning groove, is flush with the first surface, so that the appearance attractiveness of the battery cell can be improved.

In some embodiments, the spacer and/or the end cap are formed with communication passages that communicate with both side spaces of the spacer in the thickness direction.

According to the embodiment, the communicating channel is arranged, so that the air pressure between the concave part and the isolating sheet and the air pressure outside can be balanced, the probability that the isolating sheet is raised and damaged due to air pressure change is further reduced, and the appearance attractiveness of the battery cell can be improved.

In some embodiments, the communication channel is formed as an air hole or an air slit penetrating the separator in a thickness direction of the separator.

According to the embodiment, the air holes or the air gaps are formed in the isolating sheets to serve as communication channels, so that the air pressure between the concave portions and the isolating sheets can be balanced while electrolyte is prevented from flowing into the concave portions, the probability of bulge, concave and damage of the isolating sheets due to air pressure change is reduced, and the appearance attractiveness of the battery is improved. Meanwhile, the air hole or the air gap is simple in structure and convenient to produce, and further the production cost of the battery monomer can be reduced.

In some embodiments, the separator is a PP film, PE film, PET film, or PI film.

According to the embodiment, the PP film, the PE film, the PET film or the PI film is used as the isolating sheet, so that the corrosion resistance, the high temperature resistance and the insulativity of the isolating sheet can be improved, and the use reliability of the battery cell can be further improved; meanwhile, the cost of the PP film, the PE film, the PET film or the PI film is low, and the PP film, the PE film, the PET film or the PI film is used as a separation sheet, so that the production cost of the battery cell can be reduced.

In some embodiments, the outer profile of the end cap is circular.

The outer contour of the end cover is circular, so that the end cover is applicable to the cylindrical battery cell.

The battery according to the second aspect of the utility model comprises the battery cell according to the first aspect of the utility model.

According to the battery of the utility model, the battery cell of the first aspect is arranged, so that the overall performance of the battery is improved.

The electricity consumption device according to the third aspect of the present utility model comprises a battery cell according to the first aspect of the present utility model for providing electrical energy.

According to the electric device, the battery cell of the first aspect is arranged, so that the overall performance of the electric device is improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

Fig. 1 is a schematic view of a battery cell according to an embodiment of the present utility model;

fig. 2 is a partial exploded view of a battery cell according to an embodiment of the present utility model;

fig. 3 is a partial schematic view of a battery cell according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic view of the spacer shown in FIG. 3;

fig. 6 is a partial schematic view of a battery cell according to further embodiments of the present utility model;

fig. 7 is a partial schematic view of a battery cell according to still other embodiments of the utility model;

Fig. 8 is a sectional view taken along line B-B shown in fig. 7.

Reference numerals:

100. a battery cell;

10. an end cap; 11. a mounting hole; 12. a positioning groove; 13. a groove; 14. supporting the convex column;

20. a spacer; 21. a communication passage;

30. a pressure release mechanism;

41. riveting blocks; 42. a first plastic seat; 43. a second plastic seat; 431. a limit groove; 432. perforating; 44. a seal ring; 45. a transfer sheet; 46. a pole;

50. a housing.

Detailed Description

Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model.

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

In the description of embodiments of the present utility model, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present utility model, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present utility model, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present utility model, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present utility model.

In the description of the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and various fields such as aerospace and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

In the production process of the battery monomer, in order to effectively prevent the problem that the battery monomer fires and explodes under the condition of thermal runaway, an explosion-proof valve is generally arranged on an end cover of the battery monomer, and when the thermal runaway occurs in the battery monomer, a large amount of gas generated in the battery monomer can burst the explosion-proof valve to release pressure, so that the explosion or the fire of the battery monomer under the condition of thermal runaway can be prevented. The explosion-proof valve is generally installed in the installation hole on the end cover, and the installation hole penetrates through the end cover, so that the position of the explosion-proof valve is lower than the surface of the end cover of the battery cell, and a recess is formed in the surface of the end cover. Meanwhile, in order to improve the explosion-proof effect of the explosion-proof valve to a certain extent, at present, a metal boss protruding towards the direction of the battery cell is increased by adopting a method of punching end cover plates around the positive and negative explosion-proof valves, so that a hard space is supported around the explosion-proof valves for realizing smooth exhaust, thereby reducing the occurrence of the case explosion when the battery cell is out of control, but pits are formed on two sides of the explosion-proof valves, impurities enter the pits and are not easy to clean, and the problem of unclean appearance of a battery cell is caused. In addition, in the production process of the battery monomer, the battery monomer can be subjected to liquid injection treatment, if the electrolyte is splashed in the liquid injection process, the splashed electrolyte can easily flow to the explosion-proof valve and the surrounding pit because of lower positions of the pit and the explosion-proof valve, so that poor appearance of the battery monomer can be easily caused, electrolyte crystals can be left on the explosion-proof valve and the pit, and the electrolyte crystals can possibly form liquid drops to flow down after being rewet, thereby causing short circuit of a system and damaging the battery monomer.

In order to solve the problem of residual impurities and electrolyte invasion in the pit and the explosion-proof valve, researches show that the pit and the explosion-proof valve can be provided with a separation sheet, so that the separation sheet covers the pit and the explosion-proof valve to realize the isolation of the pit and the explosion-proof valve from the external environment.

Based on the above consideration, in order to solve the poor appearance and potential safety problem caused by the fact that electrolyte flows into residues at the pits and the explosion-proof valve on the end cover of the battery cell, the battery cell is designed, and through the arrangement of the isolating piece, the concave part on the end cover is sealed, and thus, the concave part and the external environment can be isolated by the isolating piece, and the electrolyte sprayed in the injection process can be effectively prevented from flowing to the concave part, the electrolyte crystallization is effectively prevented from being left in the concave part, and the problems of short circuit and unclean appearance of the system caused by the electrolyte residues of the battery cell can be effectively reduced, so that the appearance neatness and reliability of the battery cell can be improved.

When in the battery monomer production process, after the top cover assembly is finished, before baking and injecting liquid, the isolation sheet can be stuck to the concave part first, and then the baking and injecting liquid process is carried out, so that even if electrolyte splashing occurs in the liquid injection process, the isolation sheet can isolate the sputtered electrolyte outside the concave part, and then after a cleaning stage, the electrolyte on the surface of the end cover can be cleaned, and no electrolyte remains in the concave part, thereby improving the surface cleanliness and reliability of the battery monomer.

The battery cell disclosed by the embodiment of the application can be used for an electric device using a battery as a power supply or various energy storage systems using the battery as an energy storage element. The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For example, when the electric device is a vehicle, the vehicle may be a fuel-oil vehicle, a gas-oil vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle. The interior of the vehicle is provided with a battery, which may be provided at the bottom or at the head or at the tail of the vehicle. The battery may be used for power supply of the vehicle, for example, the battery may be used as an operating power source of the vehicle. The vehicle may also include a controller and a motor, the controller being configured to control the battery to power the motor, for example, for operating power requirements during start-up, navigation, and travel of the vehicle.

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

In this application, a battery refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. Some batteries may include a case for enclosing one or more battery cells or a plurality of battery modules. The box body can effectively prevent liquid or other foreign matters from affecting the charging or discharging of the battery monomer. Of course, some batteries may be provided directly in the battery mounting compartment of the power utilization device without the above-described case.

Referring to fig. 1, fig. 1 is a schematic diagram of a battery cell 100 according to some embodiments of the present application. As shown in fig. 1, the battery cell 100 of the present embodiment may include a case 50, an end cap 10, a battery cell, and an electrolyte, and the case 50 and the end cap 10 define a receiving cavity for receiving the battery cell and the electrolyte.

The housing 50 has a cylindrical shape with one end opened, and the end cap 10 is capped at the open end of the housing 50. The case 50 and the end cap 10 may be separate components, and an opening may be provided in the case 50, and the interior of the battery cell 100 may be formed by covering the opening with the end cap 10 at the opening. It is also possible to integrate the end cap 10 and the housing 50, specifically, the end cap 10 and the housing 50 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the interior of the housing 50, the end cap 10 is then covered with the housing 50. The housing 50 may be of various shapes and sizes, such as cylindrical, hexagonal, etc. Specifically, the shape of the housing 50 may be determined according to the specific shape and size of the battery cells. The material of the housing 50 may be various, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

The end cap 10 refers to a member that is covered at the opening of the case 50 to isolate the internal environment of the battery cell 100 from the external environment. The shape of the end cap 10 may be adapted to the shape of the housing 50 to fit the housing 50. Alternatively, the end cap 10 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that deformation is not easy to occur when the battery cell 100 is impacted by extrusion, so that the battery cell 100 has a higher structural strength and the safety performance is improved. The material of the end cap 10 may also be various, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

The second plastic seat 43 is a member for isolating the electrical connection member in the case 50 from the end cap 10. Wherein the second plastic seat 43 is disposed inside the end cap 10. The shape of the second plastic seat 43 may be adapted to the shape of the end cap 10. The second plastic seat 43 may also be made of various materials, including but not limited to: plastics, rubber, etc. In some embodiments, the battery cell 100 further includes other structures, for example, the battery cell 100 further includes a riveting block 41 and a first plastic seat 42, wherein the riveting block 41 is disposed at the upper end of the end cover 10, and the riveting block 41 is sleeved in the first plastic seat 42. The shape of the rivet block 41 may be varied, including but not limited to rectangular, cylindrical, etc. The shape of the first plastic seat 42 is adapted to the shape of the riveting block 41, and the riveting block 41 can be completely wrapped by the first plastic seat 42. The material of the first plastic seat 42 may also be various, including but not limited to: plastics, rubber, etc. The battery cell 100 further includes a pole 46, and the pole 46 is connected to the pole lug, and is used as an electrical connection portion of the battery cell 100 for outputting or inputting electrical energy of the battery cell 100.

A battery cell 100 according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 2 to 8. Fig. 2 is a partial exploded view of a battery cell 100 according to some embodiments of the present utility model, fig. 3 is a partial schematic view of the battery cell 100 according to some embodiments of the present utility model, fig. 4 is a cross-sectional view taken along the line A-A in fig. 3, fig. 5 is a schematic view of the spacer 20 shown in fig. 3, fig. 6 is a partial schematic view of the battery cell 100 according to other embodiments of the present utility model, fig. 7 is a partial schematic view of the battery cell 100 according to still other embodiments of the present utility model, and fig. 8 is a cross-sectional view taken along the line B-B shown in fig. 7.

An embodiment of the present utility model proposes a battery cell 100, as shown in fig. 2, the battery cell 100 includes: the battery cell comprises an end cover 10 and a spacer 20, wherein one side surface of the end cover 10, which faces away from the battery cell, is a first surface, and at least one concave part is formed on the first surface; the spacer 20 is disposed on the side of the end cap 10 facing away from the cell and covers the recess.

Among them, the cap 10 is an important part for protecting the battery cell 100, and has functions of effectively preventing the outflow of liquid, and providing a closed space and structural strength to the battery cell 100. The shape and size of the end cap 10 may be designed according to the shape and size of the battery cell 100. The end cap 10 may be made of a material having a certain strength and hardness, for example, an aluminum alloy material may be selected.

Optionally, the end cover 10 may further be provided with a liquid injection hole for injecting electrolyte into the battery cell, and after the injection is finished, the liquid injection hole is sealed by a glue nail.

Specifically, the first surface of the end cap 10 may be formed with one or more depressions, wherein a depression is a portion formed by recessing the first surface of the end cap 10 toward the other surface. The concave part comprises a plurality of types, such as grooves, blind holes or through holes, and can be designed and manufactured according to different functions.

The spacer 20 is disposed on one side of the end cap 10 facing away from the battery cell, and is used for sealing the recess, so as to prevent foreign matters, dust and other impurities from entering the recess to affect the appearance of the battery cell 100; meanwhile, when electrolyte is injected, the spacer 20 can also effectively prevent the splashed electrolyte from flowing to the concave part, effectively prevent electrolyte crystallization in the concave part, and further effectively reduce the problems of short circuit and untidy appearance of the battery cell 100 caused by electrolyte residue, thereby improving the appearance neatness and reliability of the battery cell 100.

Alternatively, the spacer 20 may have a certain insulation corrosion resistance, and may be made of an insulation corrosion-resistant plastic, for example, a polyethylene film.

According to the battery cell 100 of the embodiment of the utility model, by arranging the spacer 20 to cover the concave part of the end cover 10, foreign matters, dust and other impurities can be prevented from entering the concave part to influence the appearance of the battery cell 100; the electrolyte sprayed in the liquid injection process can be effectively prevented from flowing to the concave part, and then electrolyte crystallization can be prevented from being left in the concave part, so that the problems of short circuit and untidy appearance of the battery monomer 100 caused by electrolyte residues can be effectively reduced, and the appearance neatness and reliability of the battery monomer 100 are improved.

According to some embodiments of the present utility model, as shown in fig. 2, the battery cell 100 further includes: the pressure release mechanism 30 is formed such that at least one recess penetrates the mounting hole 11 of the end cap 10 in the thickness direction of the end cap 10, and the pressure release mechanism 30 is provided at the position of the mounting hole 11.

The pressure release mechanism 30 is a component for releasing the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold value, and when the internal pressure of the battery cell 100 is too high (e.g., thermal runaway), the pressure release mechanism 30 may be used for releasing substances (e.g., gas, liquid, particulate matters, etc.) inside the battery cell 100 to reduce the internal pressure of the battery cell 100, so as to prevent dangerous accidents such as explosion of the battery cell 100 caused by too fast internal pressurization of the battery cell 100. The pressure relief mechanism 30 may include various types, for example, the pressure relief mechanism 30 may be an explosion-proof valve, an explosion-proof sheet, etc.

In some embodiments, the battery cell 100 further includes a second plastic seat 43, where the second plastic seat 43 is disposed on a side of the end cover 10 near the battery cell, and the second plastic seat 43 is disposed between the end cover 10 and the adapter piece 45 of the battery cell 100, so as to electrically insulate between the end cover 10 and the adapter piece 45; the second plastic seat 43 is provided with a limiting groove 431, the limiting groove 431 corresponds to the mounting hole 11 of the end cover 10, a through hole 432 penetrating through the bottom wall of the limiting groove 431 is formed in the limiting groove 431, the through hole 432 is communicated with the inner space of the battery cell 100, the pressure release mechanism 30 is mounted in the limiting groove 431, the limiting groove 431 can limit the pressure release mechanism 30, and then the mounting accuracy and the mounting stability of the pressure release mechanism 30 can be improved.

In this embodiment, by setting the pressure release mechanism 30, the internal pressure can be released when the internal pressure or temperature of the battery cell 100 reaches a threshold value, so as to prevent dangerous accidents such as explosion of the battery cell 100 caused by excessively fast pressurization in the battery cell 100; meanwhile, the pressure release mechanism 30 is arranged in the mounting hole 11, so that the mounting position of the pressure release mechanism 30 can be limited, and the mounting convenience of the pressure release mechanism 30 is improved; in addition, the mounting hole 11 is covered with the spacer 20, and the spacer 20 can isolate the pressure release mechanism 30 and the external environment, so that electrolyte and other impurities can be prevented from falling into the mounting hole 11, thereby improving the reliability of the pressure release mechanism 30, meeting the normal use of the pressure release mechanism 30 and improving the overall safety of the battery cell 100.

According to some embodiments of the present utility model, as shown in fig. 2, the number of the concave portions is plural, at least one concave portion is formed as a groove 13, the groove 13 is arranged at intervals from the mounting hole 11, a side surface of the end cap 10 facing the battery cell is a second surface, a support structure is formed on the end cap 10, the support structure protrudes from the first surface toward the second surface, the support structure defines the groove 13 on a side of the first surface and is formed as a support post 14 on a side of the second surface.

For example, the number of the concave portions may be two, three, or more. Among the plurality of concave portions, one concave portion may be formed as the groove 13, or a plurality of concave portions may be formed as the groove 13. And the end cap 10 is formed with a support structure defining a recess 13 on the side where the first surface is located, i.e. the support structure may be one or more.

Specifically, the surface of one side of the end cover 10 facing the battery cell is a second surface, the supporting structure is formed into a supporting convex column 14 on the side where the second surface is located, the supporting structure is protruded from the first surface to the second surface, and then the supporting convex column 14 is protruded along the direction of the end cover 10 facing the battery cell, one protruded end of the supporting convex column 14 can be abutted against the adapter piece 45, so that the adapter piece 45 can be prevented from being deformed to block the exhaust channel due to the gas or heat impact in the battery cell 100, the pressure release effect of the pressure release mechanism 30 can be improved, and the explosion of the shell 50 caused by the thermal runaway of the battery cell can be reduced; meanwhile, the supporting structure may also increase the supporting strength of the end cap 10, and thus may increase the impact resistance of the battery cell 100.

In addition, the spacer 20 is disposed on the first surface and is used for covering the recess, that is, the spacer 20 is used for covering the recess 13 defined by the supporting structure on the first surface, so that impurities and electrolyte can be prevented from entering the recess 13, electrolyte crystallization and other impurities can be effectively prevented from remaining in the recess 13, and further the problems of short circuit and untidy appearance of the system caused by the residual electrolyte of the battery cell 100 can be effectively reduced, and thus the appearance neatness and the overall reliability of the battery cell 100 can be improved.

Optionally, the supporting structure can be manufactured by stamping, and the supporting structure is manufactured by stamping, so that the manufacturing is simple, parts do not need to be additionally added, and the production cost can be further reduced.

In some embodiments, a second plastic seat 43 is disposed on one side of the end cover 10 facing the battery core, a matching structure is disposed on the second plastic seat 43, the matching structure is formed by protruding one side surface of the second plastic seat 43 facing the end cover 10 towards the other side surface of the second plastic seat 43 facing the battery core, the matching structure defines a matching groove on one side surface facing the end cover 10, and a matching column is formed on the other side surface facing the battery core, the matching groove is matched with a supporting column 14 formed on the end cover 10, the supporting column 14 is inserted into the matching groove, i.e. the supporting column 14 is sleeved on the inner side of the matching column, and the supporting column 14 is abutted with the adapter piece 45 through the matching column of the second plastic seat 43, so that the end cover 10 and the adapter piece 45 can be completely insulated while the exhaust effect is improved, and the overall safety of the battery cell 100 can be improved.

In the embodiment, the first surface is recessed towards the second surface, and the supporting convex columns 14 formed on the second surface are used as supporting structures, so that the supporting structures can be formed on the basis of not additionally adding other parts, the use of the parts can be reduced, and the production cost is reduced; while the weight of the end cap 10 and thus the weight of the battery cell 100 can be reduced.

In addition, the supporting structure can also prevent the switching piece 45 from deforming to block the exhaust passage due to the gas or heat impact in the battery cell 100, so as to improve the pressure release effect of the pressure release mechanism 30 and reduce the explosion of the shell 50 caused by thermal runaway of the battery cell; meanwhile, the supporting structure may also increase the supporting strength of the end cap 10, and thus may increase the impact resistance of the battery cell 100. In addition, the spacer 20 covered at the end of the groove 13 of the supporting structure can prevent impurities and electrolyte from entering the groove 13, effectively prevent electrolyte crystallization and other impurities remained in the groove 13, and further effectively reduce the problems of short circuit and untidy appearance of the battery cell 100 caused by electrolyte residue, thereby improving the appearance neatness and the overall reliability of the battery cell 100.

According to some embodiments of the utility model, the number of support structures is a plurality, the plurality of support structures being spaced apart circumferentially of the pressure relief mechanism 30.

Specifically, the number of support structures may be two, three, or more. The plurality of support structures are arranged at intervals in the circumferential direction of the pressure relief mechanism 30, wherein the plurality of support structures may be arranged at uniform intervals in the circumferential direction of the pressure relief mechanism 30, or may be arranged at non-uniform intervals in the circumferential direction of the pressure relief mechanism 30.

The free ends of the supporting posts 14 of the supporting structures can be abutted against the adapting piece 45, so that a certain interval is formed between the pressure release mechanism 30 and the adapting piece 45. When thermal runaway occurs in the battery unit 100, the plurality of supporting structures can support the switching piece 45, the supporting force of the switching piece 45 can be increased, and then the switching piece 45 can be prevented from being deformed to block the exhaust channel due to the impact of gas or heat in the battery unit 100, and the periphery of the pressure release mechanism 30 can be supported to form an exhaust space by adopting the plurality of supporting structures, so that the exhaust of a large amount of gas and heat generated due to the thermal runaway of the battery core is facilitated, and further the situation that the shell 50 is burst due to the thermal runaway of the battery core can be reduced.

In this embodiment, by setting a plurality of support structures, an exhaust space can be supported around the pressure release mechanism 30, so that the pressure release effect of the pressure release mechanism 30 can be increased, and the explosion of the casing 50 caused by thermal runaway of the battery cell can be reduced.

According to some embodiments of the utility model, the number of support structures is two, the two support structures being arranged on opposite sides of the mounting hole 11 in the radial direction.

Wherein, two supporting structures are arranged at two opposite sides of the mounting hole 11 in radial direction, can be: the two support structures are arranged opposite to each other in the radial direction of the mounting hole 11, that is, the included angle of the two support structures in the circumferential direction of the mounting hole 11 may be 180 degrees, or the two support structures may slightly deviate in the radial direction of the mounting hole 11, specifically, the two support structures may be arranged at intervals of 120 ° -180 ° in the circumferential direction of the mounting hole 11, for example, the two support structures may be arranged at intervals of 120 °, 135 °, 150 ° or 165 ° in the circumferential direction of the mounting hole 11. And then can rationally set up bearing structure's position according to actual arrangement demand, reduce the production degree of difficulty of end cover 10, improve production rate, and then can reduce manufacturing cost.

The two support structures are arranged on two opposite sides of the pressure release mechanism 30 in the radial direction, so that the two support structures can support the adapter piece 45 on two opposite sides of the pressure release mechanism 30, and further the required exhaust space can be supported around the pressure release mechanism 30.

This embodiment can also reduce bearing structure's setting when satisfying release mechanism 30 exhaust smoothly through setting up two bearing structure, and then can reduce the quantity of depressed part, reduction in production cost.

According to some embodiments of the present utility model, the first surface is provided with a positioning groove 12, the recess is formed on the bottom wall of the positioning groove 12, and the spacer 20 is disposed in the positioning groove 12.

The recess is formed at the bottom of the positioning groove 12, the cross-sectional dimension of the positioning groove 12 is greater than that of the recess, the spacer 20 is disposed in the positioning groove 12, the cross-sectional dimension of the spacer 20 is greater than that of the recess, and the spacer 20 can completely cover the recess. In addition, the spacer 20 is shaped and sized to fit the positioning groove 12.

According to the embodiment, the positioning groove 12 is arranged, so that the spacing of the spacing piece 20 can be realized, the occurrence of deviation of the spacing piece 20 can be effectively prevented, and the installation accuracy and the installation stability of the spacing piece 20 can be further improved.

According to some embodiments of the present utility model, the number of the positioning slots 12 is at least one, each positioning slot 12 is provided with at least one recess, and the number of the spacers 20 corresponds to the positioning slots 12 one by one.

The number of the positioning grooves 12 may be one, two, three or more, and each positioning groove 12 may have one, two, three or more concave portions, that is, the number of the positioning grooves 12 may correspond to the number of the concave portions and the number of the spacers 20 one by one, and the number of the positioning grooves 12 may be smaller than the number of the concave portions. When the positioning grooves 12 are in one-to-one correspondence with the concave parts and the spacers 20, adjacent concave parts and matched spacers 20 can be mutually noninterfere, and when the spacers 20 are damaged, only the damaged spacers 20 can be replaced, so that the replacement and maintenance cost can be reduced; when one positioning groove 12 includes a plurality of concave portions, the number of the spacers 20 can be reduced, the process is simplified, the production cost can be reduced, and the production rate can be increased.

In this embodiment, by providing at least one positioning slot 12, the number of positioning slots 12 is identical to the number of concave portions, and the number of positioning slots 12 is smaller than the number of concave portions, so that the number of positioning slots 12 and spacers 20 can be freely selected according to the set positions of the concave portions on the end cover 10, and the adaptability of the positioning slots 12 and spacers 20 can be further increased.

According to some embodiments of the utility model, a side surface of the spacer 20 facing away from the bottom wall of the positioning groove 12 is flush with the first surface.

In this embodiment, by providing the spacer 20 with a side surface facing away from the bottom wall of the positioning slot 12 flush with the first surface, the aesthetic appearance of the battery cell 100 can be increased.

According to some embodiments of the present utility model, the spacer 20 and/or the end cap 10 is formed with communication passages 21, and the communication passages 21 communicate with both side spaces of the spacer 20 in the thickness direction.

Wherein the communication passage 21 may be formed on the spacer 20, for example, a slit of a certain size is formed on the spacer 20; the communication channel 21 may be formed on the end cap 10 to communicate the recess with the space above the end cap 10, for example, an L-shaped communication channel 21 may be formed on the periphery of the positioning groove 12, one end of the communication channel 21 may be penetrated through the sidewall of the recess, and the other end may be penetrated through the upper surface of the end cap 10; communication passages 21 may be formed in both the end cap 10 and the spacer 20. The shape of the communication passage 21 may be various, for example, may be a slit having a certain size.

In this embodiment, by providing the communication channel 21, the air pressure between the recess and the spacer 20 and the air pressure outside can be balanced, so that the probability of the spacer 20 being raised and damaged due to air pressure variation is reduced.

According to some embodiments of the present utility model, the communication passage 21 is formed as an air hole or an air slit penetrating the separator 20 in the thickness direction of the separator 20.

Wherein, in some embodiments, the communication channel 21 is formed as an air hole penetrating through the separator 20 in the thickness direction of the separator 20. Specifically, the diameter size of the air hole has certain requirements, and the opening size of the air hole is required to ensure that the air hole can meet the requirement that the concave part is communicated with outside air and the electrolyte can not leak into the concave part from the air hole.

In other embodiments, the communication passage 21 may be formed as an air slit penetrating the separator 20 in the thickness direction of the separator 20. Specifically, the opening size of the air gap has certain requirements, and the opening size of the air gap needs to ensure that the air gap can meet the requirement that the concave part is communicated with external air and the electrolyte can not leak into the concave part from the air hole.

Alternatively, the shape of the air holes may be various, for example, the air holes may be circular holes or square holes, or the like.

Alternatively, the shape of the air gap may be various, for example, a "one" shaped gap may be formed, a "ten" shaped gap may be formed, or the like.

Alternatively, the communication channel 21 may be disposed at a central position corresponding to each concave portion, so that the spacer 20 is uniformly stressed, the damage probability of the spacer 20 is reduced, and the use reliability of the spacer 20 is increased.

In this embodiment, by providing the air holes or the air slits on the separator 20 as the communication channels 21, the air pressure of the space on both sides of the separator 20 in the thickness direction can be balanced while preventing the electrolyte from flowing into the concave portion, the probability of the separator 20 being raised, depressed and damaged due to the change of the air pressure is reduced, and the appearance aesthetic property of the battery cell 100 is improved. Meanwhile, the air hole or the air gap has a simple structure and is convenient to produce, and the production cost of the battery monomer 100 can be reduced.

According to some embodiments of the utility model, the separator 20 is a PP film, PE film, PET film or PI film.

The spacer 20 may be a PP film or a PE film. Specifically, the PE film is made of a special polyethylene plastic film serving as a base material; the PP film is a thermoplastic resin material produced by polymerization of propylene. The PP film and the PE film are high polymer films, and have higher stretchability, flexibility, corrosion resistance, insulativity and high temperature resistance, and further the PP film or the PE film is adopted as the isolating sheet 20, so that the isolating sheet 20 has higher corrosion resistance, high temperature resistance and insulativity, and further the isolating sheet 20 can be prevented from being damaged due to the corrosion of electrolyte and the high temperature in the vacuum baking test stage, and the use reliability of the battery cell 100 can be improved; meanwhile, the cost of the PP film and the PE film is low, and the production cost of the battery cell 100 can be reduced.

Alternatively, the spacer 20 may be a PET film or a PI film, where the PI film is also called a polyimide film, is a novel high temperature resistant organic polymer film, and has excellent mechanical properties, electrical properties, chemical stability, and very high radiation resistance, high temperature resistance, and low temperature resistance; the PET film is also called as a high-temperature-resistant polyester film, has excellent physical properties, chemical properties, dimensional stability, transparency and recoverability, and is excellent in mechanical properties, high in toughness, high in tensile strength and impact strength, good in stiffness, stable in size, excellent in heat resistance, cold resistance, good in chemical resistance and oil resistance; further, the PET film or PI film is used as the spacer 20, and the requirements of high temperature resistance and corrosion resistance required by the spacer 20 can be satisfied.

In this embodiment, by setting the PP film, PE film, PET film or PI film as the spacer 20, corrosion resistance, high temperature resistance and insulation of the spacer 20 can be increased, and thus the reliability of the battery cell 100 can be improved; meanwhile, the cost of the PP film, the PE film, the PET film or the PI film is low, and the PP film, the PE film, the PET film or the PI film is used as the spacer 20, so that the production cost of the battery cell 100 can be reduced.

In some embodiments, the outer contour of the end cap 10 is circular.

Specifically, the outer contour of the end cap 10 is circular, and thus the end cap 10 may be adapted to a cylindrical battery cell.

The present embodiment can make the end cap 10 suitable for use in a cylindrical battery cell by providing the outer contour of the end cap 10 with a circular shape.

The battery according to the embodiment of the second aspect of the present utility model includes the battery cell 100 according to the embodiment of the first aspect of the present utility model.

According to the battery of the embodiment of the utility model, by arranging the battery cell 100 of the embodiment of the first aspect, the overall performance of the battery is improved.

The power utilization device according to the embodiment of the third aspect of the present utility model includes the battery cell 100 according to the embodiment of the first aspect of the present utility model, and the battery cell 100 is used for providing electric power.

According to the electric device of the embodiment of the utility model, by arranging the battery cell 100 of the embodiment of the first aspect, the overall performance of the electric device is improved.

The battery cell 100 according to three specific embodiments of the present utility model will be described below with reference to fig. 1 to 8.

In a first embodiment of the present utility model,

the battery unit 100 of this embodiment is a cylindrical battery unit, the cylindrical battery unit includes a housing 50 and a battery cell, the housing 50 is in a circular column shape, the inner side of the housing 50 defines a housing cavity with an open top, the battery cell is disposed in the housing cavity, and the end cover 10 covers the open top of the housing 50.

Referring to fig. 2 and 3, the battery cell 100 further includes an end cap 10, a spacer 20, a pressure release mechanism 30, a rivet 41, a first plastic seat 42, a second plastic seat 43, a sealing ring 44, a transfer tab 45, and a post 46.

The end cover 10 is in a shape of a circular plate body horizontally arranged, two pole 46 mounting holes 11 are formed in the end cover 10 at intervals, two pole 46 are respectively a positive pole and a negative pole, and the two pole 46 are respectively arranged in the two pole 46 mounting holes 11 in a penetrating mode. The riveting block 41 is provided on the upper side of the end cap 10, i.e. the riveting block 41 is provided on the side of the end cap 10 facing away from the receiving cavity, the riveting block 41 being adapted for riveting connection with the upper end of the pole 46. The switching tab 45 is located in the receiving cavity and is connected between the battery cell and the post 46.

The first plastic seat 42 is an injection molding piece, and the first plastic seat 42 is arranged between the riveting block 41 and the end cover 10 and is used for realizing electric insulation between the riveting block 41 and the end cover 10. The second plastic seat 43 is disposed at the lower side of the end cover 10, that is, the second plastic seat 43 is disposed at the side of the end cover 10 facing the accommodating cavity, and the second plastic seat 43 is disposed between the adapting piece 45 and the end cover 10 for realizing electrical insulation between the adapting piece 45 and the end cover 10. The seal ring 44 is sleeved on the pole 46 and is in sealing contact between the end cover 10 and the pole 46.

As shown in fig. 7, the end cap 10 includes a first surface and a second surface, wherein a side surface of the end cap 10 facing away from the battery cell is the first surface, and a side surface of the end cap 10 facing toward the battery cell is the second surface. Specifically, a recessed positioning groove 12 is formed on the first surface of the end cap 10, and a mounting hole 11 is formed on the bottom wall of the positioning groove 12, the mounting hole 11 penetrating the end cap 10 in the thickness direction of the end cap 10.

A limiting groove 431 is formed on the second plastic seat 43, the limiting groove 431 is aligned with and communicated with the mounting hole 11, a through hole 432 penetrating through the bottom wall of the limiting groove 431 is formed in the limiting groove 431, the through hole 432 is communicated with the inner space of the battery cell 100, and the explosion-proof valve is mounted in the limiting groove 431; the spacer 20 is adhered in the positioning groove 12 and used for sealing the mounting hole 11, and the surface of one side of the spacer 20 facing away from the mounting hole 11 is flush with the first surface of the end cover 10.

Further, an air hole penetrating through the spacer 20 in the thickness direction of the spacer 20 is formed at the central position of the spacer 20, and the air hole can be used for communicating two sides of the spacer 20 in the thickness direction; the spacer 20 may be one of PP film, PE film, PET film, or PI film.

According to the battery cell 100 of the embodiment of the utility model, the installation hole 11 of the end cover 10 is covered by the spacer 20, so that foreign matters, dust and other impurities can be prevented from entering the explosion-proof valve to influence the appearance and safety of the battery cell 100; meanwhile, the spacer 20 can also effectively prevent the electrolyte sprayed in the liquid injection process from flowing to the explosion-proof valve, so that the electrolyte can be prevented from corroding or damaging the explosion-proof valve, and the overall reliability of the battery cell 100 can be improved. In addition, the spacer 20 is provided with the air holes penetrating through the thickness direction of the spacer 20, so that the air pressure between the concave part and the spacer 20 and the air pressure outside can be balanced while the electrolyte is prevented from flowing into the explosion-proof valve, the protruding and concave situations of the spacer 20 due to the air pressure change are reduced, and the appearance attractiveness of the battery cell 100 can be further improved.

In a second embodiment of the present invention,

as shown in fig. 3, the present embodiment is substantially the same as the first embodiment in that the same reference numerals are used for the same components, and the difference is that: the battery cell 100 of the present embodiment further includes two support structures disposed on opposite sides of the explosion-proof valve in the radial direction.

Specifically, two bearing structures are first bearing structure and second bearing structure respectively, and wherein, first bearing structure and second bearing structure prescribe a limit to first recess and second recess respectively on first surface, and the shaping is protruding first support projection and second support projection to electric core direction on the second surface, and first support projection and second support projection pass through second plastic seat 43 and changeover piece 45 looks butt, can support out a hard space around the explosion-proof valve, and then can improve the explosion-proof effect of explosion-proof valve.

Referring to fig. 3, the end cap 10 is formed with a positioning groove 12, the mounting hole 11, the first groove and the second groove are formed at the bottom wall of the positioning groove 12, and the spacer 20 is adhered to the positioning groove 12 for simultaneously covering the mounting hole 11, the first groove and the second groove. Further, three air holes may be formed in the spacer 20 at the center of the mounting hole 11, the first groove, and the second groove, respectively.

In a third embodiment of the present utility model,

as shown in fig. 6, the present embodiment is substantially the same as the second embodiment in that the same reference numerals are used for the same components, and the difference is that: in the second embodiment, there are one positioning groove 12, and three positioning grooves 12 in the present embodiment.

Specifically, the three positioning grooves are a first positioning groove, a second positioning groove and a third positioning groove respectively, wherein the mounting hole 11 is formed in the bottom wall of the first positioning groove, and the first groove and the second groove are formed in the bottom wall of the second positioning groove and the bottom wall of the third positioning groove respectively.

Further, the number of the spacers 20 is three, the three spacers 20 are in one-to-one correspondence with the three positioning grooves 12, and each spacer 20 is arranged in the corresponding positioning groove 12. The three spacers 20 are respectively used for sealing the mounting hole 11, the first groove and the second groove, and an air hole penetrating through the spacers 20 along the thickness direction of the spacers 20 is formed at the central position of each spacer 20, so that air pressure of the spacers 20 in the two side spaces in the thickness direction is balanced, the probability of protrusion, depression and damage of the spacers 20 due to air pressure change is reduced, and the appearance attractiveness of the battery cell 100 is improved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present utility model is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (12)

1. A battery cell, comprising:

the battery cell comprises an end cover (10), wherein one side surface of the end cover (10) facing away from the battery cell is a first surface, and at least one concave part is formed on the first surface;

the isolating sheet (20) is arranged on one side of the end cover (10) away from the battery cell and covers the concave part;

and the pressure relief mechanism (30) is formed into a mounting hole (11) penetrating through the end cover (10) along the thickness direction of the end cover (10), and the pressure relief mechanism (30) is arranged at the position of the mounting hole (11).

2. The battery cell according to claim 1, wherein the number of the concave portions is plural, at least one of the concave portions is formed as a groove (13), the groove (13) is arranged at a spacing from the mounting hole (11),

the end cover (10) is towards the second surface of one side surface of the battery cell, a supporting structure is formed on the end cover (10), the supporting structure protrudes towards the second surface from the first surface, the supporting structure is formed into a supporting convex column (14) on one side where the first surface is located, the supporting structure is formed into a groove (13) on one side where the second surface is located.

3. The battery cell according to claim 2, wherein the number of support structures is plural, the plural support structures being arranged at intervals in the circumferential direction of the pressure release mechanism (30).

4. A battery cell according to claim 3, characterized in that the number of support structures is two, two of which are arranged on diametrically opposite sides of the mounting hole (11).

5. The battery cell according to any one of claims 1 to 4, wherein the first surface is provided with a positioning groove (12), the recess is formed on a bottom wall of the positioning groove (12), and the spacer (20) is provided in the positioning groove (12).

6. The battery cell according to claim 5, wherein the number of the positioning grooves (12) is at least one, at least one concave portion is arranged in each positioning groove (12), and the number of the isolating sheets (20) corresponds to the number of the positioning grooves (12) one by one.

7. The battery cell according to claim 6, wherein a side surface of the spacer (20) facing away from the bottom wall of the positioning groove (12) is flush with the first surface.

8. The battery cell according to claim 1, wherein the separator (20) and/or the end cap (10) is formed with communication passages (21), the communication passages (21) communicating with both side spaces of the separator (20) in the thickness direction.

9. The battery cell according to claim 8, wherein the communication passage (21) is formed as an air hole or an air slit penetrating the separator (20) in the thickness direction of the separator (20).

10. The battery cell according to claim 1, wherein the separator (20) is a PP film, a PE film, a PET film or a PI film.

11. A battery comprising a battery cell according to any one of claims 1-10.

12. An electrical device comprising a battery cell according to any one of claims 1-10 for providing electrical energy.