Battery cell, battery device, energy storage device, energy storage system and charging network

Abstract

The embodiment of the utility model provides a battery monomer, a battery device, an energy storage device, an energy storage system and a charging network, the battery monomer comprises a shell, an electrode assembly, a separator and a blocking member, the shell is provided with a first shell wall, the first shell wall is provided with a pressure relief mechanism, and the electrode assembly is accommodated in an accommodating cavity of the shell. In the first direction, the separator is arranged on the side, facing the electrode assembly, of the first shell wall, the separator is provided with a first face facing the first shell wall and a second face opposite to the first shell wall, the separator is provided with a concave part which is concave in the direction from the first face to the second face, and a pressure relief channel is formed between the first shell wall and the concave part. The pressure relief mechanism is used for being communicated with the pressure relief channel in the pressure relief state, and the concave part is provided with a through hole for communicating the containing cavity with the pressure relief channel. The blocking component is arranged in the pressure relief channel and is connected with at least one of the first shell wall and the concave part. According to the invention, the reliability of the battery monomer under an extreme condition is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery cell, a battery device, an energy storage device, an energy storage system and a charging network. BACKGROUND

[0002] Battery cells are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools, etc. The battery cell can include a cadmium-nickel battery cell, a hydrogen-nickel battery cell, an ion battery cell, and a secondary alkaline zinc-manganese battery cell, etc.

[0003] In the development of battery technology, how to improve the reliability of the battery cell in extreme conditions is a technical problem that needs to be solved in battery technology. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery cell, a battery device, an energy storage device, an energy storage system and a charging network, which is beneficial to improve the reliability of the battery cell in extreme conditions.

[0005] In a first aspect, the present application provides a battery cell, comprising: a shell having a first shell wall, the first shell wall being provided with a pressure relief mechanism; an electrode assembly accommodated in an accommodation cavity of the shell; a separator along a first direction, the separator being arranged on a side of the first shell wall facing the electrode assembly, the separator having a first surface facing the first shell wall and a second surface facing away from the first shell wall, the separator being provided with a recess recessed from the first surface to the second surface, a pressure relief passage being formed between the first shell wall and the recess, the pressure relief mechanism being configured to communicate with the pressure relief passage in a pressure relief state, the recess being provided with a through hole communicating the accommodation cavity with the pressure relief passage; and a blocking member arranged in the pressure relief passage and connected with at least one of the first shell wall and the recess.

[0006] In some embodiments of the first aspect, by arranging the blocking member in the pressure relief passage communicating with the pressure relief mechanism, when the battery cell is in thermal runaway, the high-temperature gas and solid substances inside the battery cell will flow towards the pressure relief passage. Since the flowability of the gas is better than that of the solid substances, the high-temperature gas can change direction to bypass the blocking member and make the pressure relief mechanism actuate to discharge to the outside of the battery cell, while the solid substances will be blocked by the blocking member, effectively reducing or avoiding the possibility of the solid substances being discharged to the outside of the battery cell, thereby reducing or avoiding the solid substances igniting the external oxygen to combine with the discharged high-temperature gas to produce smoke, which is beneficial to reduce the impact of thermal runaway on the battery cell and improve the reliability of the battery cell in extreme conditions.

[0007] In some embodiments, the axis of the through hole intersects the first direction.

[0008] By the above arrangement, the recess can play a certain blocking role on solid substances, so as to reduce or even avoid the possibility of solid substances entering the pressure relief channel through the through hole.

[0009] In some embodiments, along the first direction, the side of the recess opposite to the first shell wall is a closed structure, and the peripheral side of the recess is provided with a through hole.

[0010] In the above technical solution, since the flowability of gas is better than that of solid substances, the high-temperature gas can change direction to flow into the pressure relief channel from the through hole on the side surface of the recess, while the solid substances inside the battery monomer are blocked by the recess, which can more effectively reduce or avoid the possibility of solid substances being discharged to the outside of the battery monomer.

[0011] In some embodiments, in the same projection plane perpendicular to the first direction, the orthographic projection of the pressure relief mechanism is completely staggered with the orthographic projection of the blocking member. By this arrangement, the assembly of the blocking member is facilitated, and the layout is reasonable.

[0012] In some embodiments, along the first direction, the side surface of the recess away from the first shell wall protrudes from the second surface.

[0013] In the above technical solution, the through hole can be easily processed and manufactured in the recess, and the size of the partition in the first direction at other positions outside the recess can be smaller, so as to reduce the cost and weight, and also facilitate the reduction of the occupied space.

[0014] In some embodiments, the electrode assembly includes a main body part and first and second tabs connected to the main body part, at least part of the first tab is arranged on one side of the recess along the second direction, at least part of the second tab is arranged on the other side of the recess along the second direction, and the first direction intersects the second direction.

[0015] In the above technical solution, the first and second tabs can be respectively accommodated on both sides of the recess, so that the internal structure of the battery monomer is more compact.

[0016] In some embodiments, along the third direction, the recess has oppositely arranged first and second walls, and the partition has oppositely directed third and fourth surfaces, the third surface is closer to the first wall than the fourth surface, and the fourth surface is closer to the second wall than the third surface; along the third direction, the third surface protrudes from the side surface of the first wall away from the pressure relief channel, and the first wall is provided with a through hole; and / or, the fourth surface protrudes from the side surface of the second wall away from the pressure relief channel, and the second wall is provided with a through hole; the first direction, the second direction and the third direction intersect each other. In the above technical solution, the layout position of the through hole can be more flexible.

[0017] In some embodiments, a projection of the recess in a projection plane perpendicular to the first direction is any one of a polygon, a curve, a circle, and an ellipse; and / or a projection of the pressure relief channel in the projection plane perpendicular to the first direction is any one of a polygon, a curve, a circle, and an ellipse. In this way, the processing flexibility and diversity of the battery cell can be improved.

[0018] In some embodiments, the blocking member is connected to the first shell wall and the recess, and divides the pressure relief channel into a plurality of sub-channels in communication with each other, the recess is provided with a through hole in communication with at least one sub-channel, and the pressure relief mechanism is in communication with at least one sub-channel.

[0019] In the above technical solution, the flow path of the high-temperature gas flowing to the pressure relief mechanism in the pressure relief channel can be more complex, so as to improve the blocking effect of the blocking member on the solid matter.

[0020] In some embodiments, the plurality of sub-channels includes a first channel and a second channel, the recess is provided with a through hole in communication with the first channel, and the pressure relief mechanism is in communication with the second channel. In this way, the processing and manufacturing are facilitated.

[0021] In some embodiments, the plurality of sub-channels includes a first channel, a second channel, and a third channel, the recess is provided with a through hole in communication with the first channel and a through hole in communication with the third channel, and the pressure relief mechanism is in communication with the second channel.

[0022] In the above technical solution, the blocking effect of the blocking member on the solid matter can be further improved.

[0023] In some embodiments, the recess has a bottom wall and a side wall connected to each other, the bottom wall is arranged opposite to the first shell wall along the first direction, and the side wall is located between the bottom wall and the first shell wall, and the blocking member is connected to the first shell wall and the bottom wall. In the above technical solution, the assembly of the blocking member is facilitated.

[0024] In some embodiments, the blocking member includes a first blocking piece and a second blocking piece spaced apart along a third direction, the first channel, the second channel, and the third channel are arranged along the third direction, the side wall includes a first wall and a second wall opposite to each other along the third direction, and a third wall and a fourth wall opposite to each other along a second direction; the first blocking piece is connected to at least one of the first wall, the second wall, the third wall, and the fourth wall, the second blocking piece is connected to at least one of the first wall, the second wall, the third wall, and the fourth wall, and the first direction, the second direction, and the third direction intersect with each other.

[0025] In the above technical solution, the blocking member can divide the pressure relief channel into the first channel, the second channel, and the third channel in communication along the third direction, so as to ensure the effectiveness of the high-temperature gas entering the second channel from the first channel and the third channel and being discharged by the pressure relief mechanism.

[0026] In some embodiments, the first barrier is connected to the third wall and is spaced apart from the fourth wall, and the third wall is provided with a through hole in communication with the first channel; and / or, the second barrier is connected to the fourth wall and is spaced apart from the third wall, and the fourth wall is provided with a through hole in communication with the third channel.

[0027] In the above scheme, the first barrier and the second barrier can be designed according to the above arrangement, which is conducive to better improving the blocking effect on solid substances.

[0028] In some embodiments, the blocking member further comprises a third barrier and a fourth barrier spaced apart along the third direction, the third barrier is arranged on the side of the first barrier facing the second barrier, the third barrier is connected to the fourth wall and is spaced apart from the third wall, and the side of the first barrier facing away from the third barrier is provided with a through hole along the third direction; the fourth barrier is arranged on the side of the second barrier facing the first barrier, the fourth barrier is connected to the third wall and is spaced apart from the fourth wall, and the side of the second barrier facing away from the fourth barrier is provided with a through hole along the third direction. Through the above arrangement, the blocking effect on solid substances can be further improved.

[0029] In some embodiments, the first barrier comprises a first barrier portion and a second barrier portion spaced apart, the first barrier portion is connected to the third wall, and the second barrier portion is connected to the fourth wall; and / or, the second barrier comprises a third barrier portion and a fourth barrier portion spaced apart, the third barrier portion is connected to the third wall, and the fourth barrier portion is connected to the fourth wall.

[0030] In the above scheme, the first barrier and the second barrier can be designed according to the above arrangement, which is conducive to better improving the blocking effect on solid substances.

[0031] In some embodiments, the first barrier comprises a first barrier portion and a second barrier portion, the second barrier portion extends along the second direction, the first barrier portion extends along the first direction and is connected between the first wall and the second barrier portion, and the second barrier portion is spaced apart from the third wall and the fourth wall respectively; and / or, the second barrier comprises a third barrier portion and a fourth barrier portion, the fourth barrier portion extends along the second direction, the third barrier portion extends along the first direction and is connected between the second wall and the fourth barrier portion, and the fourth barrier portion is spaced apart from the third wall and the fourth wall respectively.

[0032] In the above scheme, the first barrier and the second barrier can be designed according to the above arrangement, which is conducive to better improving the blocking effect on solid substances.

[0033] In some embodiments, at least one of the third wall and the fourth wall is provided with a through hole in communication with the first channel, and at least one of the third wall and the fourth wall is provided with a through hole in communication with the third channel. In this way, the flexibility of the layout position of the through hole is improved.

[0034] In some embodiments, the blocking member includes a first blocking piece and a second blocking piece spaced apart along a second direction, the first channel, the second channel and the third channel are arranged along the second direction, the side wall includes a first wall and a second wall opposite along a third direction, and a third wall and a fourth wall opposite along the second direction; the first blocking piece is closer to the third wall than the second blocking piece, the third wall is provided with a through hole in communication with the first channel, and the through hole is opposite to the first blocking piece along the second direction; the second blocking piece is closer to the fourth wall than the first blocking piece, the fourth wall is provided with a through hole in communication with the third channel, and the through hole is opposite to the second blocking piece along the second direction, and the first direction, the second direction and the third direction intersect with each other.

[0035] In the above scheme, the first blocking piece and the second blocking piece can be designed according to the above arrangement, which can better improve the blocking effect of the solid substance.

[0036] In some embodiments, the first blocking piece is spaced apart from the first wall, the second wall, the third wall and the fourth wall respectively; and / or, the second blocking piece is spaced apart from the first wall, the second wall, the third wall and the fourth wall respectively. In this way, the efficiency of the high-temperature gas flowing from the first channel and the second channel into the second channel is improved.

[0037] In some embodiments, the first shell wall is recessed inwardly on one side surface facing the isolation piece to form a groove, the groove and the recess form a pressure relief channel, the groove bottom wall protrudes from the first shell wall on a side away from the isolation piece, and the groove bottom wall is provided with a pressure relief mechanism.

[0038] In the above technical solution, by providing the groove, the size of the pressure relief channel in the first direction is increased, so that the space for gas flow is increased, and the rate of gas discharge during thermal runaway is improved.

[0039] In some embodiments, the isolation piece is further provided with a protrusion on each side along the second direction, the protrusion protrudes from the second surface on a side away from the first surface, the protrusion has a cavity and a via hole in communication with the cavity, and along the second direction, the protrusion is provided with the via hole on a side surface facing the recess; at least one side of the protrusion along the first direction is provided with the via hole, and / or, along the second direction, a side surface of the protrusion away from the recess is provided with the via hole, and the first direction intersects with the second direction.

[0040] By means of the above arrangement, when the battery monomer is in thermal runaway, the high-temperature gas at other positions in the battery monomer can flow to the through hole provided in the concave part through the via provided in the convex part, and enter the pressure relief channel, so that the via provided in the convex part can play a flow guiding role, improve the gas discharge efficiency, and also help to reduce the weight of the convex part, so as to reduce the weight of the battery monomer.

[0041] In some embodiments, the shell comprises a housing having an opening and an end cover covering the opening, and the end cover comprises a first shell wall. In this way, the shell is convenient to manufacture.

[0042] In a second aspect, the application provides a battery device comprising a plurality of battery monomers according to any one of the embodiments of the first aspect.

[0043] In a third aspect, the application provides an energy storage device comprising a plurality of battery monomers according to any one of the embodiments of the first aspect or a plurality of battery devices according to any one of the embodiments of the second aspect, wherein the battery monomers or the battery devices are used to store or provide electric energy.

[0044] In a fourth aspect, the application provides an energy storage system comprising a power conversion device and an energy storage device according to any one of the embodiments of the third aspect, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0045] In a fifth aspect, the application provides a charging network comprising a charging pile and an energy storage device according to any one of the embodiments of the third aspect or an energy storage system according to any one of the embodiments of the fourth aspect, wherein the energy storage device is used to provide electric energy for the charging pile.

[0046] The above description is only a summary of the technical solutions of the application. In order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments of the application. Obviously, the drawings described below are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0048] Figure 1 The structure diagram of a charging network in some embodiments of the application;

[0049] Figure 2 The structure diagram of an energy storage system in some embodiments of the application;

[0050] Figure 3 A structural schematic view of a battery device provided by some embodiments of the present application;

[0051] Figure 4 A structural schematic view of a battery device provided by some embodiments of the present application;

[0052] Figure 5 A structural schematic view of a battery device provided by some embodiments of the present application;

[0053] Figure 6 A structural schematic view of a battery device provided by some embodiments of the present application;

[0054] Figure 7 A structural schematic view of a battery device provided by some embodiments of the present application;

[0055] Figure 8 A structural schematic view of a battery device provided by some embodiments of the present application;

[0056] Figure 9 A structural schematic view of a battery device provided by some embodiments of the present application;

[0057] Figure 10 A structural schematic view of a battery device provided by some embodiments of the present application;

[0058] Figure 11 A structural schematic view of a battery device provided by some embodiments of the present application;

[0059] Figure 12 A structural schematic view of a battery device provided by some embodiments of the present application;

[0060] Figure 13 A structural schematic view of a battery device provided by some embodiments of the present application;

[0061] Figure 14 A structural schematic view of a battery device provided by some embodiments of the present application;

[0062] Figure 15 A structural schematic view of a battery device provided by some embodiments of the present application;

[0063] Figure 16 A structural schematic view of a battery device provided by some embodiments of the present application;

[0064] Reference signs of the detailed description are as follows:

[0065] 1000, charging network; 2000, energy storage system; 3000, power generation device;

[0066] 200, energy storage device; 210, energy storage box; 300, charging pile; 400, energy storage converter;

[0067] 100, battery device; 4, battery monomer assembly;

[0068] 1, battery monomer; 2, box; 201, first box; 202, second box;

[0069] 10, shell; 110, housing; 1101, opening; 1102, containing cavity; 120, end cover; 11, first shell wall; 111, groove bottom wall; 112, top surface; 113, bottom surface;

[0070] 101, pressure relief channel; 1011, first channel; 1012, second channel; 1013, third channel;

[0071] 20, electrode assembly; 21, main body part; 22, first tab; 23, second tab;

[0072] 30, spacer; 301, first face; 302, second face; 303, third face; 304, fourth face; 31, recess; 320, bottom wall; 310, side wall; 3101, through hole; 311, first wall; 312, second wall; 313, third wall; 314, fourth wall; 32, protrusion; 321, via hole;

[0073] 40, pressure relief mechanism; 60, electrode terminal;

[0074] 50, blocking member; 51, first blocking piece; 501, first blocking part; 502, second blocking part; 52, second blocking piece; 503, third blocking part; 504, fourth blocking part; 53, third blocking piece; 54, fourth blocking piece;

[0075] X, first direction; Y, first direction; Z, third direction. DETAILED DESCRIPTION

[0076] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an overly literal sense unless expressly so defined herein.

[0078] Reference throughout this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment.

[0079] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0080] The term "and / or" in this application is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0081] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0082] "Multiple" appearing in this application means two or more (including two).

[0083] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of battery device, the demand of its market is also increasing.

[0084] In the embodiment of the present application, the battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging.

[0085] The battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc. The present application is not limited thereto.

[0086] The pressure relief mechanism refers to an element or component that is actuated to release the internal pressure when the internal pressure of the battery monomer reaches a predetermined threshold. The pressure relief mechanism on the battery monomer has an important influence on the reliability of the battery monomer. For example, when short circuit, overcharge and other phenomena occur, it may cause thermal runaway inside the battery monomer and the pressure rises sharply. In this extreme case, the internal pressure can be released outward by actuating the pressure relief mechanism to avoid explosion or fire of the battery monomer.

[0087] When the battery monomer in the related art abnormally, the high temperature gas and other emissions in the internal of the battery monomer will be discharged by the explosion-proof valve to release the internal pressure. However, in the process of pressure relief, the solid substances in the internal of the battery monomer will also be discharged to the outside of the battery monomer, which is easy to react with the external oxygen and the just discharged high temperature gas, etc. to appear the safety problem of fire.

[0088] Based on the above technical problem, the present application provides a battery monomer, which comprises a shell, an electrode assembly, a separator and a blocking member. The shell has a first shell wall, the first shell wall is provided with a pressure relief mechanism, and the electrode assembly is accommodated in the accommodation cavity of the shell. Along the first direction, the separator is arranged on the side of the first shell wall facing the electrode assembly, the separator has a first surface facing the first shell wall and a second surface facing away from the first shell wall, the separator is provided with a recess recessed along the direction from the first surface to the second surface, the first shell wall and the recess form a pressure relief channel, the pressure relief mechanism communicates with the pressure relief channel, and the recess is provided with a through hole communicating the accommodation cavity and the pressure relief channel. The blocking member is arranged in the pressure relief channel and connected with at least one of the first shell wall and the recess.

[0089] By arranging the blocking member in the pressure relief channel communicated with the pressure relief mechanism, when the battery monomer occurs thermal runaway, the high-temperature gas and solid substances in the battery monomer flow towards the pressure relief channel. Due to the flowability of the gas being better than that of the solid substances, the high-temperature gas can change direction to bypass the blocking member, and the pressure relief mechanism is actuated to be discharged to the outside of the battery monomer, while the solid substances are blocked by the blocking member, so as to effectively reduce or avoid the possibility of the solid substances being discharged to the outside of the battery monomer, thereby reducing or avoiding the solid substances igniting the external oxygen to combine with the discharged high-temperature gas to produce smoke, thereby facilitating to reduce the influence of thermal runaway on the battery monomer, and improving the reliability of the battery monomer in extreme conditions.

[0090] The technical solutions described in the embodiments of the present application are applicable to various battery devices or power equipment using battery monomers, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., for example, spacecraft including airplanes, rockets, space shuttles and spacecraft, etc.

[0091] The technical solutions described in the embodiments of the present application are applicable to various battery devices or energy storage containers or energy storage cabinets and other energy storage devices using battery monomers.

[0092] Please refer to Figure 1 , Figure 3 and Figure 6 , Figure 1 a structural schematic diagram of a charging network 1000 provided by some embodiments of the present application, Figure 3 a structural schematic diagram of an energy storage device 200 provided by some embodiments of the present application, Figure 6 an explosion structural schematic diagram of a battery monomer 1 provided by some embodiments of the present application. The present application provides a charging network 1000, which includes a charging pile 300 for charging power equipment. The charging network 1000 can also include an energy storage device 200, which is electrically connected with the charging pile 300, and the energy storage device 200 is used to provide electric energy for the charging pile 300.

[0093] It should be noted that the charging pile 300 and the battery monomer 1 in the energy storage device 200 are electrically connected through a cable, and the battery monomer 1 can provide its own stored electric energy to the charging pile 300. The charging pile 300 has a connector which can be connected with the power equipment, so as to supply energy to the power equipment. The charging network 1000 applies the energy storage device 200, which can effectively improve the safety of the charging network 1000, and also helps to improve the flexibility of the charging network 1000 when deployed.

[0094] In one charging network 1000, the charging pile 300 can be one, and the energy storage device 200 provides power for the charging pile 300; the charging pile 300 can also be multiple, and the energy storage device 200 provides power for multiple charging piles 300.

[0095] As an example, as shown in Figure 1 , the charging network 1000 includes one energy storage device 200 and two charging piles 300, and one energy storage device 200 provides power for two charging piles 300.

[0096] As shown in Figure 3 , the energy storage device 200 can include a battery device 100, and the battery device 100 is electrically connected with the charging pile 300, so as to provide power for the charging pile 300.

[0097] Please refer to Figure 2 and Figure 3 , Figure 2 The structural schematic diagram of the energy storage system 2000 provided by some embodiments of the present application is shown. The embodiments of the present application provide an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 400, and the energy storage converter 400 can be electrically connected with a power generation device 3000 to convert the power provided by the power generation device 3000. The energy storage system 2000 can also include an energy storage device 200, and the energy storage device 200 is electrically connected with the energy storage converter 400, and the energy storage converter 400 guides the power provided by the power generation device 3000 to the energy storage device 200 after power conversion for storage.

[0098] The power conversion device is used to connect between the power generation device 3000 and the energy storage device 200. The power generation device 3000 is used to generate power, and the power generation device 3000 is used to store the power generated by the power generation device 3000 to the energy storage device 200 through the power conversion device. The energy storage system 2000 applies the energy storage device 200, which can effectively improve the operation safety of the energy storage system 2000. In specific implementation, the power generation equipment can be a solar panel, a hydroelectric power generation equipment, a thermal power generation equipment, etc. The specific type of the power generation equipment is not limited in the present application.

[0099] As an example, as shown in Figure 2 , the energy storage system 2000 includes an energy storage device 200 and an energy storage converter 400, and two power generation devices 3000 respectively transmit the generated power to the energy storage converter 400, and the power is guided to the energy storage device 200 through the energy storage converter 400 for storage.

[0100] As shown in Figure 3 , the energy storage device 200 includes an energy storage box 210, and the energy storage box 210 is provided with a battery device 100.

[0101] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, or the like.

[0102] As an example, the energy storage device 200 can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, or the like. The energy storage power station can store electric energy during the low electricity consumption period and provide electric energy to relevant users or electric equipment during the peak electricity consumption period. The wind power generator set of the wind power system can collect wind energy and convert the wind energy into electric energy, which is stored by the energy storage device 200. The solar power system can convert solar energy into electric energy, which is stored by the energy storage device 200 and supplied to users in time. The mobile power system can supply electric energy to relevant electric equipment in places where the power grid supply system cannot reach, such as remote mountainous areas and remote wild areas. The temporary power supply system can supply electric energy to users in the case of insufficient power supply.

[0103] Please refer to Figure 4 , Figure 4 A structural schematic diagram of a battery cell assembly 4 is provided for some embodiments of the present application. The battery apparatus 100 mentioned in the embodiments of the present application can include one or more battery cell assemblies 4 for providing voltage and capacity. The battery cell assembly 4 can include a plurality of battery cells 1 connected in series, in parallel, or in a mixed connection mode through a busbar component.

[0104] In some embodiments, the battery cell assembly 4 is generally formed by arranging a plurality of battery cells 1.

[0105] Please refer to Figure 5 , Figure 5 An exploded structural schematic diagram of a battery apparatus 100 is provided for some embodiments of the present application. In some embodiments, the battery apparatus 100 can be a battery pack including a box 2 and one or more battery cell assemblies 4 accommodated in the box 2.

[0106] As an example, the battery cell assembly 4 can be a battery module, and the battery cell assembly 4 can be accommodated in the box 2 by fixing the battery module in the box 2.

[0107] As an example, the battery cell assembly 4 can also be accommodated in the box 2 by directly fixing a plurality of battery cells 1 in the box 2.

[0108] As an example, the box 2 can include a first box 201 and a second box 202. The first box 201 and the second box 202 are fastened to form a containing cavity, so that an enclosed space is formed inside the box 2 to accommodate the battery monomer assembly 4. The enclosed here means covered or closed, which can be sealed or unsealed. The first box 201 can be a top cover or a bottom plate.

[0109] As an example, the box 2 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that an enclosed space is formed inside the box 2 to accommodate the battery monomer assembly 4.

[0110] The box 2 can be a simple cuboid or a cylindrical body, or a complex cuboid or a cylindrical body composed of a simple cuboid or a cylindrical body, and the embodiments of the present application are not limited thereto.

[0111] Specifically, the box 2 can be a metal shell made of alloy steel, alloy aluminum or the like, or a composite material shell made of metal and polypropylene or the like.

[0112] As an example, the battery monomer assembly 4 can be a battery module, which is formed by arranging and fixing a plurality of battery monomers 1 into an independent module. As an example, the battery module can be formed by binding a plurality of battery monomers 1 by a cable tie.

[0113] Please refer to Figure 6 , the battery monomer 1 includes a shell 10 and an electrode assembly 20.

[0114] The shell 10 is a component for forming an internal environment of the battery monomer 1, and the shell 10 has a containing cavity 1102, which can be used to contain the electrode assembly 20, and can also be used to contain electrolyte and other components. Optionally, the shell 10 can be made of metal or non-metal material, for example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metal material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0115] For example, the shell 10 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0116] In some embodiments, the shell 10 can be a sealed structure or an unsealed structure. As an example, when the shell 10 is an unsealed structure, the shell 10 plays a role of protecting the electrode assembly 20, and a sealing bag is further included between the shell 10 and the electrode assembly 20, which is used to package the electrode assembly 20 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating piece or an aluminum-plastic film. When the shell 10 is a sealed structure, it is used to package the electrode assembly 20, the electrolyte and other components.

[0117] In some embodiments, the housing 10 comprises an end cap 120 and a shell 110, the shell 110 having a receiving cavity 1102 and being provided with an opening 1101 in communication with the receiving cavity 1102, and the end cap 120 is provided on the opening 1101. The shell 110 can be provided with one or more openings 1101. The end cap 120 can also be provided with one or more openings.

[0118] The shape of the housing 10 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cuboid structure, a cuboid housing can be selected; if the electrode assembly 20 is a cylindrical structure, a cylindrical housing can be selected.

[0119] The electrode assembly 20 is a component in which electrochemical reactions occur in the battery cell 1, and one or more electrode assemblies 20 can be contained in the shell 110.

[0120] In some embodiments, the shape of the electrode assembly 20 can be cylindrical, flat, or multi-prismatic, etc.

[0121] The electrode assembly 20 can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0122] The electrode assembly 20 comprises a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell 1, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0123] Please continue to refer to Figure 6 , the battery cell 1 further comprises a pressure relief mechanism 40. The pressure relief mechanism 40 is used to discharge the internal gas of the battery cell 1. Among them, the pressure relief mechanism 40 can be provided on the housing 10.

[0124] As an example, the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold value to actuate to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold value, the pressure relief mechanism 40 performs an action or a weak structure provided in the pressure relief mechanism 40 is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell 1.

[0125] The "actuation" mentioned in the present application refers to the action or activation of the pressure relief mechanism 40 to a certain state, so that the internal pressure and temperature of the battery cell 1 can be released. The action of the pressure relief mechanism 40 can include but is not limited to: the movement of the components in the pressure relief mechanism 40 to form an exhaust passage, the rupture, fragmentation, tearing or opening of at least a part of the pressure relief mechanism 40, etc. When the pressure relief mechanism 40 is actuated, the high-temperature and high-pressure substances inside the battery cell 1 will be discharged outward from the actuated part as exhaust. In this way, the battery cell can be depressurized and cooled at a controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0126] The exhaust from the battery cell 1 mentioned in the present application includes but is not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases generated by reactions, flames, etc.

[0127] Please refer to Figures 6 to 9 , Figure 7 A partial explosion structure schematic diagram of a battery cell 1 provided for some embodiments of the present application, Figure 8 A partial structure schematic diagram of a separator 30 in a battery cell 1 provided for some embodiments of the present application, Figure 9 A structure schematic diagram of a separator 30 in a battery cell 1 provided for some embodiments of the present application.

[0128] According to the embodiments of the present application, a battery cell 1 is provided, which includes a shell 10, an electrode assembly 20, a separator 30 and a blocking member 50. The shell 10 has a first shell wall 11 provided with a pressure relief mechanism 40. The electrode assembly 20 is contained in a containing cavity 1102 of the shell 10. Along a first direction X, the separator 30 is arranged on a side of the first shell wall 11 facing the electrode assembly 20, the separator 30 has a first face 301 facing the first shell wall 11 and a second face 302 facing away from the first shell wall 11, the separator 30 is provided with a recess 31 recessed along the direction from the first face 301 to the second face 302, a pressure relief passage 101 is formed between the first shell wall 11 and the recess 31, the pressure relief mechanism 40 is configured to communicate with the pressure relief passage 101 in a pressure relief state, and the recess 31 is provided with a through hole 3101 communicating the containing cavity 1102 with the pressure relief passage 101. The blocking member 50 is arranged in the pressure relief passage 101 and connected with at least one of the first shell wall 11 and the recess 31.

[0129] In the embodiments of the present application, the first direction X can be understood as the thickness direction of the first shell wall 11, and when the first shell wall 11 is located on at least one side of the battery cell 1 along its own height direction, the first direction X can also be understood as the height direction of the battery cell 1. Exemplarily, the second direction Y can be understood as the length direction of the first shell wall 11, and the third direction Z can be understood as the width direction of the first shell wall 11.

[0130] The shell 10 has a first shell wall 11, which can be one wall on the shell body 110 or one wall on the end cover 120.

[0131] The isolation piece 30 is located between the first shell wall 11 and the electrode assembly 20, which is used to improve the insulation performance of the first shell wall 11 and the electrode assembly 20, so as to isolate the first shell wall 11 and the electrode assembly 20, and prevent the battery monomer 1 from being corroded by the electrolyte to cause the electrical connection problem of the battery monomer 1.

[0132] The first shell wall 11 and the isolation piece 30 can be assembled and connected by welding, fusion and the like. The first shell wall 11 and the isolation piece 30 can also be assembled into one body by bolts, screws and the like fasteners.

[0133] The "pressure relief state" refers to that when the internal pressure of the battery monomer 1 abnormally rises, the pressure relief mechanism 40 is opened to communicate with the pressure relief channel 101 to release the internal pressure of the battery monomer 1, so as to prevent the battery monomer 1 from being damaged due to overpressure. As an example, the pressure relief mechanism 40 can be integrally formed with the first shell wall 11. Alternatively, the pressure relief mechanism 40 can also be separately provided and connected with the first shell wall 11.

[0134] The pressure relief channel 101 can provide a flow path for the high-temperature gas generated when the battery monomer 1 is in thermal runaway. The pressure relief mechanism 40 is arranged on the first shell wall 11, and the pressure relief channel 101 is formed between the first shell wall 11 and the recess 31. The pressure relief mechanism 40 is used to communicate with the pressure relief channel 101 in the pressure relief state. It can be understood that the pressure relief mechanism 40 is located on the side of the pressure relief channel 101 away from the isolation piece 30 along the first direction X, or it can also be understood that in the same projection plane perpendicular to the first direction X, the orthographic projection of the pressure relief mechanism 40 falls within the orthographic projection of the pressure relief channel 101. When the battery monomer 1 is in thermal runaway, the electrode assembly 20 sprays high-temperature gas. The high-temperature gas in the containing cavity 1102 can enter the pressure relief channel 101 through the through hole 3101 and act on the pressure relief mechanism 40, so as to be quickly released after the pressure relief mechanism 40 is actuated.

[0135] As shown in Figure 7 and Figure 9 The recess 31 has a bottom wall 320 spaced apart from the first shell wall 11 along the first direction X and a side wall 310 connected with the bottom wall 320. The side wall 310 is arranged between the bottom wall 320 and the first shell wall 11. The through hole 3101 can be arranged on the side wall 310 or the bottom wall 320. Of course, the side wall 310 and the bottom wall 320 can both be provided with the through hole 3101.

[0136] Specifically, the blocking member 50 is arranged between the through hole 3101 and the pressure relief mechanism 40, that is, the blocking member 50 is used to block the solid substances entering the pressure relief channel 101, and the high-temperature gas can bypass the blocking member 50 to flow to the pressure relief mechanism 40. By arranging the blocking member 50, the possibility of the solid substances being discharged from the pressure relief mechanism 40 to the outside of the battery monomer 1 can be reduced or even avoided.

[0137] It should be noted that when the battery monomer is in thermal runaway, the main components of the high-temperature gas released by the battery monomer are hydrogen and alkane gas, which is easy to combine with external oxygen to form smoke, and the internal temperature is usually higher than 180℃. On the one hand, the adhesion effect of the internal active substance is poor, and the gas accompanying the thermal runaway can be discharged to the outside of the battery monomer. On the other hand, some aluminum beads produced by thermal melting in a high-temperature environment are also easy to be taken out of the battery monomer with the thermal runaway gas. These solid substances discharged to the outside of the battery monomer are easy to ignite the external flammable gas such as smoke, causing secondary damage to the battery monomer.

[0138] Therefore, the battery monomer 1 provided by some embodiments of the present application can be arranged by arranging the blocking member 50 in the pressure relief channel 101 communicating with the pressure relief mechanism 40. When the battery monomer 1 is in thermal runaway, the high-temperature gas and solid substances in the containing cavity 1102 will flow towards the pressure relief channel 101. Because the flowability of the gas is better than that of the solid substances, the high-temperature gas can change direction to bypass the blocking member 50, and the pressure relief mechanism 40 is actuated to be smoothly discharged to the outside of the battery monomer 1, while the solid substances in the battery monomer 1 are blocked by the blocking member 50 to effectively reduce or avoid the possibility of the solid substances being discharged to the outside of the battery monomer 1, thereby facilitating to avoid the solid substances igniting the smoke generated by the combination of the external oxygen and the discharged high-temperature gas, and further facilitating to reduce the influence of thermal runaway on the battery monomer 1, thereby improving the reliability of the battery monomer 1 in extreme conditions.

[0139] The number and shape of the through hole 3101 are not limited in the present application. The through hole 3101 can be one or multiple, and the shape of the through hole 3101 can be circular, polygonal or other shapes.

[0140] In some embodiments, the orthographic projection of the through hole 3101 and the orthographic projection of the pressure relief mechanism 40 are completely staggered in the same projection plane perpendicular to the first direction X.

[0141] The blocking member 50 can be connected to the first shell wall 11, or the blocking member 50 can also be connected to the recess 31, or the blocking member 50 can be connected to the first shell wall 11 and the recess 31 respectively.

[0142] Optionally, the blocking member 50 can be connected with the bottom wall 320 of the recess 31, or the blocking member 50 can be connected with the bottom wall 320 and the side wall 310 of the recess 31 respectively, or the blocking member 50 can be connected with the bottom wall 320, the side wall 310 and the first shell wall 11 respectively.

[0143] In some embodiments, the axial direction of the through hole 3101 is perpendicular to the first direction X.

[0144] When the bottom wall 320 of the recess 31 is provided with the through hole 3101, the axial direction of the through hole 3101 can be inclined to the first direction X, so that the hole wall of the through hole 3101 can block the solid substance to some extent, and the possibility of the solid substance discharging from the battery monomer 1 can be further reduced.

[0145] When the side wall 310 of the recess 31 is provided with the through hole 3101, the axial direction of the through hole 3101 can be perpendicular to the first direction X, and the axial direction of the through hole 3101 can be the second direction X or the third direction Z, which is convenient for processing and manufacturing, and because the flowability of gas is better than that of solid substance, the high-temperature gas can change direction to enter the pressure relief channel 101 from the side of the recess 31, while the solid substance is blocked by the recess 31.

[0146] In some embodiments, along the first direction X, the side of the recess 31 opposite to the first shell wall 11 is a closed structure, and the circumferential side of the recess 31 is provided with the through hole 3101.

[0147] Please refer to Figure 9 The side of the recess 31 opposite to the first shell wall 11 can be understood as the bottom wall 320 of the recess 31, and the circumferential side of the recess 31 can be understood as the side wall 310 of the recess 31.

[0148] By setting the through hole 3101 on the circumferential side of the recess 31, the gas released by the battery monomer 1 in the containment cavity 1102 during thermal runaway can be guided into the pressure relief channel 101 from the side of the recess 31, instead of directly entering the pressure relief channel 101 along the first direction X. By this way of setting, the bottom wall 320 of the recess 31 can block the solid substance in the containment cavity 1102 to avoid entering the pressure relief channel 101. Even if a part of the solid substance flows into the pressure relief channel 101 with the high-temperature gas, the blocking member 50 in the pressure relief channel 101 can also block the solid substance for the second or third time, so as to further reduce or avoid the possibility of the solid substance igniting the external oxygen to combine with the released high-temperature gas to produce smoke, so as to better reduce the influence of thermal runaway on the battery monomer 1, and to improve the reliability of the battery monomer 1 in extreme conditions.

[0149] Optionally, the side wall 310 can be an arc-shaped structure with a curvature, that is, in the same projection plane perpendicular to the first direction X, the orthographic projection of the side wall 310 is an arc-shaped structure.

[0150] Optionally, the side wall 310 can be a linear structure, and the side wall 310 can include a third wall 313 and a fourth wall 314 opposite to each other along the second direction Y, and the side wall 310 further includes a first wall 311 and a second wall 312 opposite to each other along the third direction Z. At least one of the first wall 311, the second wall 312, the third wall 313 and the fourth wall 314 is provided with a through hole 3101, so that the axis of the through hole 3101 intersects the first direction X.

[0151] Optionally, the first wall 311, the second wall 312, the third wall 313 and the fourth wall 314 are all provided with a through hole 3101, which is beneficial to improve the efficiency of discharging high-temperature gas, so as to further reduce the influence of thermal runaway on the battery monomer 1.

[0152] As an example, the bottom wall 320 of the recess 31 can be a flat plate structure.

[0153] As an example, the bottom wall 320 of the recess 31 can be provided as a concave-convex structure, such as a wave shape, etc., which can further improve its blocking effect on solid substances.

[0154] As shown in FIG. 1, Figure 9 In some embodiments, along the first direction X, the side of the recess 31 away from the side surface of the first shell wall 11 protrudes from the second surface 302.

[0155] The recess 31 can be formed on the isolation piece 30 by processes such as stamping or extrusion. During the formation of the recess 31, the first surface 301 is recessed towards the second surface 302, and the second surface 302 protrudes away from the first surface 301, so as to form the recess 31.

[0156] By this way of arrangement, the influence of the recess 31 on the strength of the isolation piece 30 can be reduced, and the side of the recess 31 away from the first shell wall 11 can also be in contact with the electrode assembly 20, providing a limiting or supporting effect for the electrode assembly 20, preventing displacement of the electrode assembly 20 during normal operation of the battery monomer 1, and being beneficial to improve the reliability of the battery monomer 1.

[0157] Moreover, it is also convenient to process the through hole 3101 on the peripheral side of the recess 31, and the other parts of the isolation piece 30 outside the recess 31 can have a smaller size in the first direction X, so as to reduce the cost and weight, and also be beneficial to reduce the occupied space.

[0158] Please refer to Figure 6 and Figure 9In some embodiments, the electrode assembly 20 includes a main body 21 and a first electrode tab 22 and a second electrode tab 23 connected to the main body 21. At least a portion of the first electrode tab 22 is disposed on one side of the recess 31 along the second direction Y, and at least a portion of the second electrode tab 23 is disposed on the other side of the recess 31 along the second direction Y. The first direction X intersects the second direction Y.

[0159] From the external shape of the electrode assembly 20, the electrode assembly 20 includes a main body 21 and a first electrode tab 22 and a second electrode tab 23 connected to the main body 21. The first electrode tab 22 can be defined as a positive electrode tab, and the second electrode tab 23 can be defined as a negative electrode tab. The first electrode tab 22 and the second electrode tab 23 can both extend from the same end of the main body 21, or they can extend from opposite ends of the main body 21, respectively. For example, both the first electrode tab 22 and the second electrode tab 23 extend from the end of the main body 21 near the insulating member 30.

[0160] The main body 21 is the core component of the electrode assembly 20, enabling its charging and discharging functions. The first tab 22 and the second tab 23 are used to draw out the current generated by the main body 21. The main body 21 includes a positive current collector for a positive current collector, a positive active material layer, a negative current collector for a negative current collector, a negative active material layer, and an insulating component. The first tab 22 may include multiple first tab portions, and the second tab 23 may include multiple second tab portions.

[0161] In the second direction Y, the spaces formed by the two sides of the recess 31 and the second surface 302 of the separator 30 can be used to accommodate at least a portion of the electrode assembly 20. By setting it in the above manner, the space for arranging the electrode assembly 20 inside the housing 10 can be increased, so that the battery cell 1 has a larger electrode assembly 20, which is beneficial to improving the energy density of the battery cell 1. Alternatively, the size of the housing 10 can be reduced, making the battery cell 1 more compact, which is beneficial to improving the structural compactness of the battery cell 1, reducing the overall size of the battery cell 1, and thus reducing the space it occupies.

[0162] Furthermore, by setting it in the above manner, the electrode assembly 20 can be positioned closer to the through hole 3101, allowing high-temperature gas to enter the pressure relief channel more quickly through the through hole 3101, thereby improving the gas release efficiency of the battery cell 1 during thermal runaway.

[0163] like Figure 6 As shown, in some embodiments, the battery cell 1 is further provided with two electrode terminals 60, which are used to electrically connect with the electrode assembly 20 for outputting or inputting electrical energy of the battery cell 1. One electrode terminal 60 is electrically connected to the first tab 22, and the other electrode terminal 60 is electrically connected to the second tab 23. The connection can be direct or indirect through a current collector.

[0164] Exemplarily, both of the electrode terminals 60 are arranged on the first shell wall 11, and the two electrode terminals 60 are spaced apart along the second direction Y, and the pressure relief mechanism 40 is arranged between the two electrode terminals 60.

[0165] Please refer to Figure 8 In some embodiments, along the third direction Z, the recess 31 has the first wall 311 and the second wall 312 oppositely arranged, and the spacer 30 has the third face 303 and the fourth face 304 oppositely arranged, the third face 303 is closer to the first wall 311 than the fourth face 304, and the fourth face 304 is closer to the second wall 312 than the third face 303. Along the third direction Z, the third face 303 protrudes from the side surface of the first wall 311 away from the pressure relief channel 101, and the first wall 311 is provided with the through hole 3101, and the first direction X, the second direction Y and the third direction Z intersect with each other.

[0166] The "third face 303 protrudes from the side surface of the first wall 311 away from the pressure relief channel 101 along the third direction Z" can also be understood as that the recess 31 has a dimension along the third direction Z, which is smaller than the dimension of the first face 301 and the second face 302 along the third direction Z.

[0167] In the above manner, the high-temperature gas in the containing cavity 1102 can flow into the pressure relief channel 101 through the through hole 3101 from the gap between the side surface of the first wall 311 away from the pressure relief channel 101 and the third face 303, which is conducive to improving the discharge efficiency of the high-temperature gas of the battery monomer 1 in thermal runaway.

[0168] Please refer to Figure 9 In some embodiments, along the third direction Z, the fourth face 304 protrudes from the side surface of the second wall 312 away from the pressure relief channel 101, and the second wall 312 is provided with the through hole 3101.

[0169] The "fourth face 304 protrudes from the side surface of the second wall 312 away from the pressure relief channel 101" can also be understood as that the recess 31 has a dimension along the third direction Z, which is smaller than the dimension of the first face 301 and the second face 302 along the third direction Z.

[0170] In the above manner, the high-temperature gas in the containing cavity 1102 can flow into the pressure relief channel 101 through the through hole 3101 from the gap between the side surface of the second wall 312 away from the pressure relief channel 101 and the fourth face 304, which is conducive to improving the discharge efficiency of the high-temperature gas of the battery monomer 1 in thermal runaway.

[0171] Optionally, along the third direction Z, the third face 303 protrudes from a side surface of the first wall 311 facing away from the pressure relief channel 101, the first wall 311 is provided with the through hole 3101, and the fourth face 304 protrudes from a side surface of the second wall 312 facing away from the pressure relief channel 101, the second wall 312 is provided with the through hole 3101.

[0172] Please refer to Figures 9 to 11 , Figure 10 A structural schematic diagram of a separator 30 in a battery monomer 1 provided by some embodiments of the present application is shown in FIG. 3. Figure 11 A structural schematic diagram of a separator 30 in a battery monomer 1 provided by some embodiments of the present application is shown in FIG. 3.

[0173] In some embodiments, a projection of the recess 31 in the same projection plane perpendicular to the first direction X is any one of a polygon, a curve, a circle, and an ellipse.

[0174] For example, as shown in FIG. 4A, a projection of the recess 31 in the same projection plane perpendicular to the first direction X is a rectangle. Figure 9 and Figure 10 For example, as shown in FIG. 4A, a projection of the recess 31 in the same projection plane perpendicular to the first direction X is a rectangle.

[0175] The shape of the recess 31 can be set as any one of the above structures, which is conducive to improving the diversity of the separator 30, thereby being conducive to improving the diversity of the battery monomer 1.

[0176] In some embodiments, a projection of the pressure relief channel 101 in the same projection plane perpendicular to the first direction X is any one of a polygon, a curve, a circle, and an ellipse.

[0177] For example, when the blocking member 50 is connected to at least the side wall 310 of the recess 31 and divides the pressure relief channel 101 into sub-channels arranged along the second direction Y or along the third direction Z and communicated, a projection of the pressure relief channel 101 in the same projection plane perpendicular to the first direction X is any one of a polygon, a circle, and an ellipse. As shown in FIG. 4B, a projection of the pressure relief channel 101 in the same projection plane perpendicular to the first direction X is a curve, which can be understood as a U-shaped or S-shaped bending structure. Figures 9 to 11

[0178] The shape of the pressure relief channel 101 can be set as any one of the above structures, which is conducive to improving the diversity of the battery monomer 1.

[0179] Please refer to Figures 7 to 15 , Figure 12 A structural schematic diagram of a separator 30 in a battery monomer 1 provided by some embodiments of the present application is shown in FIG. 3. Figure 13 ​A structural schematic view of a separator 30 in a battery monomer 1 according to some embodiments of the present application, Figure 14 A structural schematic view of a separator 30 in a battery monomer 1 according to some embodiments of the present application, Figure 15 A structural schematic view of a separator 30 in a battery monomer 1 according to some embodiments of the present application.

[0180] In some embodiments, the blocking member 50 is connected to the first shell wall 11 and the recess 31, and divides the pressure relief passage 101 into multiple sub-passages in communication, the recess 31 is provided with a through hole 3101 in communication with at least one of the sub-passages, and the pressure relief mechanism 40 is in communication with at least one of the sub-passages.

[0181] In this way, the layout area of the blocking member 50 can be increased, so that the flow path of the high-temperature gas flowing to the pressure relief mechanism 40 in the pressure relief passage 101 is more complex, thereby improving the blocking effect of the blocking member 50 on solid substances.

[0182] In addition, the blocking member 50 is connected to the first shell wall 11 and the recess 31, which can also increase the connection strength of the first shell wall 11 and the recess 31, thereby facilitating the increase of the structural strength of the battery monomer 1, so as to avoid the damage of the first shell wall 11 or the recess 31 during the operation of the battery monomer 1, and facilitate the improvement of the reliability of the battery monomer 1.

[0183] Optionally, the blocking member 50 can be installed on the separator 30 first, and then assembled with the first shell wall 11 as a whole, or the blocking member 50 can be installed on the first shell wall 11 first, and then assembled with the separator 30 as a whole.

[0184] Optionally, the blocking member 50 can be a whole structure, or a split structure including multiple members.

[0185] Optionally, the recess 31 is provided with a through hole 3101 in communication with at least one of the sub-passages, and the pressure relief mechanism 40 is in communication with any one of the sub-passages.

[0186] Optionally, the area of each sub-passage can be the same, or different. Optionally, the shape of each sub-passage can be the same, or different.

[0187] In some embodiments, the blocking member 50 can divide the pressure relief passage 101 into multiple sub-passages arranged in the first direction X and in communication, and the high-temperature gas entering the pressure relief passage 101 from the through hole 3101 can bypass the blocking member 50 and act on the pressure relief mechanism 40, while at least part of the solid substances are blocked by the blocking member 50. Further, in this structure, the bottom wall 320 of the recess 31 can be provided with a through hole 3101, and of course, the side wall 310 of the recess 31 can also be provided with a through hole 3101.

[0188] In other embodiments, the blocking member 50 may also divide the pressure relief channel 101 into a plurality of sub-channels arranged and connected along the second direction Y or along the third direction Z.

[0189] like Figure 7 and Figure 8 As shown, in some embodiments, the multiple sub-channels include a first channel 1011 and a second channel 1012, the recess 31 is provided with a through hole 3101 communicating with the first channel 1011, and the pressure relief mechanism 40 is communicating with the second channel 1012.

[0190] "The pressure relief mechanism 40 is connected to the second channel 1012" means that the high-temperature gas can only act on the pressure relief mechanism 40 and actuate it when it flows into the second channel 1012. It can also be understood as the orthographic projection of the pressure relief mechanism 40 and the orthographic projection of the second channel 1012 completely overlapping in the same projection plane perpendicular to the first direction X, or the orthographic projection of the pressure relief mechanism 40 falling into the orthographic projection of the second channel 1012.

[0191] The high-temperature gas in the accommodating cavity 1102 can enter the first channel 1011 through the through hole 3101 and then flow into the second channel 1012, so as to activate and discharge the pressure relief mechanism 40 connected to the second channel 1012. The blocking member 50 can divide the pressure relief channel 101 into two connected sub-channels, so that the path of the high-temperature gas from the through hole 3101 to the pressure relief mechanism 40 is more tortuous, increasing the blocking effect of the blocking member 50 on solid materials, thereby reducing or even avoiding the possibility of solid materials being discharged to the outside to ignite the flue gas, and also facilitating the processing and manufacturing of the isolation member 30.

[0192] Optionally, when the multiple sub-channels include only the first channel 1011 and the second channel 1012, the recess 31 may also be provided with a through hole 3101 communicating with the second channel 1012.

[0193] like Figure 7 and Figure 8 As shown, the first channel 1011 and the second channel 1012 can be arranged along the third direction Z. Of course, in some other embodiments, the first channel 1011 and the second channel 1012 can also be arranged along the second direction Y.

[0194] like Figures 9 to 15 As shown, in some embodiments, the multiple sub-channels include a first channel 1011, a second channel 1012 and a third channel 1013. The recess 31 is provided with a through hole 3101 communicating with the first channel 1011 and a through hole 3101 communicating with the third channel 1013. The pressure relief mechanism 40 is connected to the second channel 1012.

[0195] The high-temperature gas in the accommodation cavity 1102 can enter the first passage 1011 or the third passage 1013 from the through hole 3101, and then flow into the second passage 1012, so that the pressure relief mechanism 40 in communication with the second passage 1012 is actuated and discharged, and the blocking member 50 can separate the pressure relief passage 101 into three sub-passages in communication, so that the path of the high-temperature gas flowing from the through hole 3101 to the pressure relief mechanism 40 is more tortuous, which can further increase the blocking effect of the blocking member 50 on the solid matter. Even if some solid matter in the accommodation cavity 1102 flows into the first passage 1011 or the third passage 1013 along with the high-temperature gas from the through hole 3101, the blocking member 50 can also block this some solid matter, thereby reducing or even avoiding the possibility of solid matter being discharged to the outside to ignite the flue gas, thereby facilitating to improve the reliability of the battery monomer 1 in extreme cases.

[0196] Optionally, when the plurality of sub-passages only include the first passage 1011, the second passage 1012 and the third passage 1013, the recess 31 can also be provided with a through hole 3101 in communication with the second passage 1012.

[0197] Optionally, the blocking member 50 can separate the pressure relief passage 101 into the first passage 1011, the second passage 1012 and the third passage 1013 in communication along the second direction Y, and also separate the pressure relief passage 101 into the first passage 1011, the second passage 1012 and the third passage 1013 in communication along the third direction Z.

[0198] In some embodiments, the recess 31 has a bottom wall 320 and a side wall 310 connected to each other, the bottom wall 320 and the first shell wall 11 are oppositely arranged along the first direction X, and the side wall 310 is located between the bottom wall 320 and the first shell wall 11, and the blocking member 50 is connected to the first shell wall 11 and the bottom wall 320.

[0199] By this way, the layout is reasonable, and the blocking member 50 can also support the first shell wall 11 and the bottom wall 320, avoiding the deformation between the first shell wall 11 and the bottom wall 320, which is conducive to improving the overall strength of the battery monomer 1.

[0200] Please refer to Figures 9 to 14In some embodiments, the blocking member 50 comprises a first blocking piece 51 and a second blocking piece 52 spaced apart along the third direction Z, the first passage 1011, the second passage 1012 and the third passage 1013 are arranged along the third direction Z, the side wall 310 comprises a first wall 311 and a second wall 312 opposite along the third direction Z, and a third wall 313 and a fourth wall 314 opposite along the second direction Y, the first blocking piece 51 is connected to at least one of the first wall 311, the second wall 312, the third wall 313 and the fourth wall 314, the second blocking piece 52 is connected to at least one of the first wall 311, the second wall 312, the third wall 313 and the fourth wall 314, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0201] By arranging the blocking member 50 to comprise the first blocking piece 51 and the second blocking piece 52 spaced apart along the third direction Z, the processing is facilitated, and the blocking member 50 can provide more uniform support between the first shell wall 11 and the bottom wall 320 of the recess 31, thereby improving the reliability of the battery monomer 1.

[0202] By arranging in the above manner, the flexibility of the layout position of the first blocking piece 51 and the second blocking piece 52 is improved, thereby improving the diversity of the isolation piece 30, and further improving the diversity of the battery monomer 1.

[0203] Please refer to Figures 9 to 12 In some embodiments, the first blocking piece 51 is connected to the third wall 313 and spaced apart from the fourth wall 314, and the third wall 313 is provided with a through hole 3101 communicating with the first passage 1011.

[0204] For example, as shown in Figure 9 and Figure 12 When the high-temperature gas in the accommodation cavity 1102 enters the first passage 1011 through the through hole 3101 of the third wall 313, and then flows into the second passage 1012 from the first passage 1011, by arranging the first blocking piece 51, the bending path of the gas flow is increased, thereby increasing the blocking effect on the solid matter, reducing the possibility of the solid matter entering the second passage 1012, thereby reducing or even avoiding the possibility of the solid matter being discharged to the outside to ignite the smoke, thereby improving the reliability of the battery monomer 1 in extreme conditions.

[0205] In some embodiments, the second blocking piece 52 is connected to the fourth wall 314 and spaced apart from the third wall 313, and the fourth wall 314 is provided with a through hole 3101 communicating with the third passage 1013.

[0206] For example, as shown in Figure 9 and Figure 12As shown, when the high-temperature gas in the accommodating cavity 1102 enters the third channel 1013 through the through hole 3101 of the fourth wall 314, and then flows into the second channel 1012 through the third channel 1013, the second blocking member 52 can increase the tortuous path of the gas flow, thereby increasing the blocking effect on solid materials, reducing the possibility of solid materials entering the second channel 1012, thereby reducing or even avoiding the possibility of solid materials being discharged to the outside to ignite the flue gas, which in turn helps to improve the reliability of the battery cell 1 under extreme conditions.

[0207] In some embodiments, the first blocking member 51 is connected to the third wall 313 and spaced apart from the fourth wall 314. The third wall 313 is provided with a through hole 3101 communicating with the first channel 1011. The second blocking member 52 is connected to the fourth wall 314 and spaced apart from the third wall 313. The fourth wall 314 is provided with a through hole 3101 communicating with the third channel 1013.

[0208] like Figure 9 As shown, for example, in this structure, the first blocking member 51 can be a strip or plate extending along the third direction Z, and the second blocking member 52 can also be a strip or plate extending along the third direction Z. The layout is regular and easy to process and manufacture.

[0209] like Figure 11 As shown, for example, in this structure, the first blocking member 51 can be a semi-circular structure, and the second blocking member 52 can also be a semi-circular structure, with a regular layout that is easy to process and manufacture.

[0210] like Figure 12 As shown, for example, in this structure, the first blocking member 51 can be an arc-shaped structure, and the second blocking member 52 can also be an arc-shaped structure, with a regular layout that is easy to process and manufacture.

[0211] Please see Figure 9 and Figure 10 In some embodiments, the blocking member 50 further includes a third blocking member 53 and a fourth blocking member 54 spaced apart along a third direction Z. The third blocking member 53 is disposed on the side of the first blocking member 51 facing the second blocking member 52, and is connected to the fourth wall 314 and spaced apart from the third wall 313. Along the third direction Z, the side of the first blocking member 51 facing away from the third blocking member 53 has a through hole 3101. The fourth blocking member 54 is disposed on the side of the second blocking member 52 facing the first blocking member 51, and is connected to the third wall 313 and spaced apart from the fourth wall 314. Along the third direction Z, the side of the second blocking member 52 facing away from the fourth blocking member 54 has a through hole 3101.

[0212] For example, by Figure 10As shown, when the high-temperature gas in the accommodation cavity 1102 enters the first channel 1011 through the through hole 3101 of the third wall 313, and then flows into the second channel 1012 from the first channel 1011, by arranging the third blocking piece 53, the bending path of the gas flow can be increased, thereby increasing the blocking effect on the solid matter, and further reducing the possibility of the solid matter entering the second channel 1012, so as to reduce or even avoid the possibility of the solid matter being discharged to the outside to ignite the smoke, thereby facilitating to improve the reliability of the battery monomer 1 in an extreme case. Figure 10 The through hole 3101 provided on the fourth wall 314 is not shown, and it can be understood that the through hole 3101 provided on the fourth wall 314 is located on the side of the second blocking piece 52 away from the first blocking piece 51.

[0213] Please refer to Figure 13 In some embodiments, the first blocking piece 51 includes a first blocking part 501 and a second blocking part 502 arranged at intervals, the first blocking part 501 is connected with the third wall 313, and the second blocking part 502 is connected with the fourth wall 314.

[0214] When the high-temperature gas in the accommodation cavity 1102 flows into the first channel 1011 through the through hole 3101 communicating with the first channel 1011, it will flow into the second channel 1012 through the gap between the first blocking part 501 and the second blocking part 502. By this way of arrangement, even if some solid matter flows into the first channel 1011 with the high-temperature gas through the through hole 3101, the first blocking part 501 and the second blocking part 502 can also block this some solid matter, thereby reducing or even avoiding the possibility of the solid matter being discharged to the outside to ignite the smoke, and further facilitating to improve the reliability of the battery monomer 1 in an extreme case.

[0215] In this structure, in some embodiments, at least one of the third wall 313 and the fourth wall 314 is provided with a through hole 3101 communicating with the first channel 1011. That is, the third wall 313 can be provided with a through hole 3101 communicating with the first channel 1011, and the fourth wall 314 can also be provided with a through hole 3101 communicating with the first channel 1011.

[0216] Further, in order to improve the discharge efficiency, the second wall 312 can also be provided with a through hole 3101 communicating with the first channel 1011.

[0217] For example, the first blocking part 501 and the second blocking part 502 can be arranged at intervals along the second direction Y. Alternatively, the first blocking part 501 and the second blocking part 502 can also be arranged staggered along the second direction Y.

[0218] Please refer to Figure 13In some embodiments, the second blocking member 52 comprises a third blocking portion 503 and a fourth blocking portion 504, the third blocking portion 503 is connected to the third wall 313, and the fourth blocking portion 504 is connected to the fourth wall 314.

[0219] When the high-temperature gas in the accommodation cavity 1102 flows into the first channel 1011 through the through hole 3101 which is in communication with the third channel 1013, it will flow into the second channel 1012 through the gap between the third blocking portion 503 and the fourth blocking portion 504. In this way, even if some solid substances flow into the third channel 1013 with the high-temperature gas through the through hole 3101, the third blocking portion 503 and the fourth blocking portion 504 can still block these solid substances, thereby reducing or even avoiding the possibility of solid substances being discharged to the outside to ignite the smoke, and thus being conducive to improving the reliability of the battery monomer 1 in extreme cases.

[0220] In this structure, in some embodiments, at least one of the third wall 313 and the fourth wall 314 is provided with a through hole 3101 which is in communication with the third channel 1013.

[0221] That is, the third wall 313 can be provided with a through hole 3101 which is in communication with the third channel 1013, and the fourth wall 314 can also be provided with a through hole 3101 which is in communication with the third channel 1013. Further, in order to improve the discharge efficiency, the first wall 311 can also be provided with a through hole 3101 which is in communication with the third channel 1013.

[0222] For example, the third blocking portion 503 and the fourth blocking portion 504 can be spaced apart along the second direction Y. Alternatively, the third blocking portion 503 and the fourth blocking portion 504 can also be staggered along the second direction Y.

[0223] Please refer to Figure 14 In some embodiments, the first blocking member 51 comprises a first blocking portion 501 and a second blocking portion 502, the second blocking portion 502 extends along the second direction Y, the first blocking portion 501 extends along the first direction X and is connected between the first wall 311 and the second blocking portion 502, and the second blocking portion 502 is spaced apart from the third wall 313 and the fourth wall 314 respectively.

[0224] When the high-temperature gas in the receiving cavity 1102 flows into the first channel 1011 through the through hole 3101 communicating with the first channel 1011, it will flow into the second channel 1012 through the gap between the second blocking part 502 and the third wall 313 or the fourth wall 314. With this configuration, even if some solid materials flow into the first channel 1011 with the high-temperature gas through the through hole 3101, the first blocking part 501 and the second blocking part 502 can also block these solid materials, thereby reducing or even preventing the possibility of solid materials being discharged to the outside to ignite the smoke, which in turn helps to improve the reliability of the battery cell 1 under extreme conditions.

[0225] In this structure, in some embodiments, at least one of the third wall 313 and the fourth wall 314 is provided with a through hole 3101 communicating with the first channel 1011. That is, the third wall 313 may be provided with a through hole 3101 communicating with the first channel 1011, and the fourth wall 314 may also be provided with a through hole 3101 communicating with the first channel 1011.

[0226] Furthermore, in order to improve the discharge efficiency, the second wall 312 may also be provided with a through hole 3101 that communicates with the first channel 1011.

[0227] For example, by Figure 14 As shown, in the projection plane perpendicular to the first direction X, the orthographic projection of the first blocking member 51 has a T-shaped structure.

[0228] Please see Figure 14 In some embodiments, the second blocking member 52 includes a third blocking portion 503 and a fourth blocking portion 504. The fourth blocking portion 504 extends along the second direction Y, and the third blocking portion 503 extends along the first direction X and is connected between the second wall 312 and the fourth blocking portion 504. The fourth blocking portion 504 is spaced apart from the third wall 313 and the fourth wall 314, respectively.

[0229] When the high-temperature gas in the receiving cavity 1102 flows into the third channel 1013 through the through hole 3101 communicating with the third channel 1013, it will flow into the second channel 1012 through the gap between the fourth blocking part 504 and the third wall 313 or the fourth wall 314. With this arrangement, even if some solid materials flow into the first channel 1011 with the high-temperature gas through the through hole 3101, the third blocking part 503 and the fourth blocking part 504 can also block these solid materials, thereby reducing or even avoiding the possibility of solid materials being discharged to the outside to ignite the smoke, which is beneficial to improving the reliability of the battery cell 1 under extreme conditions.

[0230] In this structure, in some embodiments, at least one of the third wall 313 and the fourth wall 314 is provided with a through hole 3101 communicating with the third channel 1013. That is, the third wall 313 may be provided with a through hole 3101 communicating with the third channel 1013, and the fourth wall 314 may also be provided with a through hole 3101 communicating with the third channel 1013.

[0231] Furthermore, in order to improve the discharge efficiency, the second wall 312 may also be provided with a through hole 3101 that communicates with the first channel 1011.

[0232] For example, by Figure 14 As shown, in the projection plane perpendicular to the first direction X, the orthographic projection of the second blocking member 52 has a T-shaped structure.

[0233] Please see Figure 15 In some embodiments, the blocking member 50 includes a first blocking member 51 and a second blocking member 52 spaced apart along the second direction Y. A first channel 1011, a second channel 1012, and a third channel 1013 are arranged along the second direction Y. The sidewalls 310 have a first wall 311 and a second wall 312 opposite each other along the third direction Z, and a third wall 313 and a fourth wall 314 opposite each other along the second direction Y. The first blocking member 51 is closer to the third wall 313 than the second blocking member 52. The third wall 313 has a through hole 3101 communicating with the first channel 1011, and the through hole 3101 is opposite to the first blocking member 51 along the second direction Y. The second blocking member 52 is closer to the fourth wall 314 than the first blocking member 51. The fourth wall 314 has a through hole 3101 communicating with the third channel 1013, and the through hole 3101 is opposite to the second blocking member 52 along the second direction Y. The first direction X, the second direction Y, and the third direction Z intersect each other.

[0234] "Through hole 3101 and first blocking member 51 are arranged opposite each other along the second direction Y" means that, in the same projection plane perpendicular to the second direction Y, the orthographic projection of the through hole 3101 provided on the third wall 313 falls into the orthographic projection of the first blocking member 51. Correspondingly, "Through hole 3101 and second blocking member 52 are arranged opposite each other along the second direction Y" means that, in the same projection plane perpendicular to the second direction Y, the orthographic projection of the through hole 3101 provided on the fourth wall 314 falls into the orthographic projection of the second blocking member 52.

[0235] By the above arrangement, even if some solid substances flow into the first channel 1011 or the third channel 1013 with the high-temperature gas from the through hole 3101, under the action of inertia, the solid substances are blocked by the first blocking piece 51 and the second blocking piece 52 in the first channel 1011 and the second channel 1012, so as to reduce the possibility of the solid substances entering the second channel 1012, thereby reducing or even avoiding the possibility of the solid substances being discharged to the outside to ignite the flue gas, and thus facilitating to improve the reliability of the battery monomer 1 in an extreme case.

[0236] For example, in this structure, the first blocking piece 51 can be a strip-shaped or plate-shaped structure extending in the third direction Z, and the second blocking piece 52 can also be a strip-shaped or plate-shaped structure extending in the third direction Z, which is regular in layout and facilitates processing and manufacturing.

[0237] As shown in Figure 15 some embodiments, the first blocking piece 51 is arranged spaced apart from the first wall 311, the second wall 312, the third wall 313, and the fourth wall 314, respectively.

[0238] That is, the first blocking piece 51 is only connected with the first shell wall 11 and the bottom wall of the recess 31 along the first direction X, and when the high-temperature gas in the containing cavity 1102 enters the first channel 1011 from the through hole 3101 located in the third wall 313, the high-temperature gas can flow to both sides along the third direction Z, and flow into the second channel 1012 through the gap between the first blocking piece 51 and the first wall 311 and the gap between the first blocking piece 51 and the second wall 312, and then be discharged by the pressure relief mechanism 40 arranged on one side of the second channel 1012 along the first direction X. By the above arrangement, it is beneficial to improve the efficiency of the high-temperature gas flowing from the first channel 1011 to the second channel 1012, thereby facilitating to improve the efficiency of the high-temperature gas discharge, so as to improve the reliability of the battery monomer 1 in an extreme case.

[0239] As shown in Figure 15 some embodiments, the second blocking piece 52 is arranged spaced apart from the first wall 311, the second wall 312, the third wall 313, and the fourth wall 314, respectively.

[0240] That is, the second blocking piece 52 is connected with the first shell wall 11 and the bottom wall of the recess 31 only along the first direction X, when the high-temperature gas in the containing cavity 1102 enters the third channel 1013 through the through hole 3101 located on the fourth wall 314, the gas can flow to both sides along the third direction Z, and flow into the second channel 1012 through the gap between the second blocking piece 52 and the first wall 311 and the gap between the second blocking piece 52 and the second wall 312, and then be discharged by the pressure relief mechanism 40 arranged on one side of the second channel 1012 along the first direction X. By the above-mentioned arrangement, it is beneficial to improve the efficiency of the high-temperature gas flowing from the first channel 1011 to the second channel 1012, thereby improving the efficiency of discharging the high-temperature gas, so as to improve the reliability of the battery monomer 1 in extreme cases.

[0241] Optionally, the first blocking piece 51 is arranged spaced apart from the first wall 311, the second wall 312, the third wall 313 and the fourth wall 314 respectively, and the second blocking piece 52 is arranged spaced apart from the first wall 311, the second wall 312, the third wall 313 and the fourth wall 314 respectively.

[0242] It should be noted that the shapes and layout positions of the first blocking piece 51 and the second blocking piece 52 can be the same or different, and the above-provided embodiments of the first blocking piece 51 and the second blocking piece 52 can be used in combination with each other.

[0243] In some embodiments, the blocking member 50 and the isolation piece 30 are an integral structure.

[0244] By this arrangement, not only the assembly efficiency between the blocking member 50 and the isolation piece 30 is improved, but also the displacement of the blocking member 50 under the impact of the gas can be avoided, which is beneficial to improve the connection strength between the blocking member 50 and the isolation piece 30.

[0245] In other optional embodiments, the blocking member 50 can also be an integral structure with the first shell wall 11.

[0246] Please refer to Figure 7 and Figure 16 , Figure 16 is a partial structure schematic view of the shell 10 in the battery monomer 1 provided in some embodiments of the present application.

[0247] In some embodiments, the first shell wall 11 is recessed inward on one side surface thereof facing the isolation piece 30 to form a recess, and a pressure relief channel 101 is formed between the recess and the recess 31, and the groove bottom wall 111 of the recess is protruded from the first shell wall 11 on the side away from the isolation piece 30, and the groove bottom wall 111 is provided with the pressure relief mechanism 40.

[0248] The first shell wall 11 has a bottom surface 113 facing the partition 30 and a top surface 112 facing away from the partition 30 in the first direction X. The recess can be formed on the first shell wall 11 by stamping or extrusion, etc. In the process of forming the recess, the bottom surface 113 is recessed towards the top surface 112, and the top surface 112 is protruded away from the bottom surface 113 to form the recess.

[0249] By providing the recess on the side surface of the first shell wall 11 facing the partition 30, and forming the pressure relief channel 101 between the recess and the recessed portion 31, the size of the pressure relief channel 101 in the first direction X can be increased, thereby increasing the space for gas flow, which is beneficial to improve the rate of gas discharge during thermal runaway. Moreover, by the above arrangement, the pressure relief channel 101 can accommodate more gas to increase the impact force of the gas on the pressure relief mechanism 40, so that the pressure relief mechanism 40 can be actuated in time and smoothly discharge gas.

[0250] Optionally, the shape and area of the recess can be the same as or different from the shape of the recessed portion 31. For example, in the same projection plane perpendicular to the first direction X, the orthographic projection of the recessed portion 31 falls within the orthographic projection plane of the recess.

[0251] Please refer to Figure 9 In some embodiments, the partition 30 further comprises a protrusion 32 on each side in the second direction Y. The protrusion 32 protrudes from the second surface 302 away from the first surface 301, and has a cavity and a via 321 communicating with the cavity. In the second direction Y, the protrusion 32 is provided with the via 321 on the side surface facing the recessed portion 31. The protrusion 32 is provided with the via 321 on at least one side in the first direction X, and / or the protrusion 32 is provided with the via 321 on the side surface facing away from the recessed portion 31 in the second direction Y. The first direction X intersects the second direction Y.

[0252] By the above arrangement, when the battery monomer 1 undergoes thermal runaway, high-temperature gas at other positions inside the battery monomer 1 can flow to the through hole 3101 provided by the recessed portion 31 through the via 321 provided by the protrusion 32, and enter the pressure relief channel 101. The via 321 provided by the protrusion 32 can play a role in guiding the flow, improving the discharge efficiency of the gas, and also being beneficial to reduce the weight of the protrusion 32 to reduce the weight of the battery monomer 1.

[0253] For example, the protrusion 32 is provided with the via 321 on both sides in the first direction X and on both sides in the second direction Y, which is beneficial to further improve the discharge efficiency of the gas and further reduce the weight of the battery monomer 1.

[0254] And the convex part 32 can also contact with the electrode assembly 20 along the first direction X away from the side surface of the first shell wall 11 to provide a limiting or supporting effect for the electrode assembly 20, so as to prevent displacement of the electrode assembly 20 during normal operation of the battery monomer 1, and improve the reliability of the battery monomer 1.

[0255] In some embodiments, as shown in Figure 6 The shell 10 includes a shell body 110 and an end cover 120, the shell body 110 has an opening 1101, and the end cover 120 covers the opening 1101, and the end cover 120 includes the first shell wall 11.

[0256] The shell body 110 has a containing cavity 1102 and the opening 1101 in communication with the containing cavity 1102.

[0257] In the above manner, the shell 10 is convenient for processing and manufacturing, and convenient for assembling, which is beneficial to reduce the cost of the battery monomer 1.

[0258] In the specific assembly process of the battery monomer 1, the end cover 120 and the isolation piece 30 can be assembled into an integrated body, and then the integrated body is assembled with the shell body 110.

[0259] According to some embodiments of the present application, the present application also provides a battery device 100, which includes a plurality of battery monomers 1 according to any one of the above embodiments.

[0260] According to some embodiments of the present application, the present application also provides an energy storage device 200, which includes a battery monomer 1 according to any one of the above embodiments or a battery device 100 according to any one of the above embodiments, and the battery monomer 1 or the battery device 100 is used for storing or providing electric energy.

[0261] According to some embodiments of the present application, the present application also provides an energy storage system 2000, which includes a power conversion device and an energy storage device 200 according to any one of the above embodiments, and the power conversion device is used for electrically connecting a power generation device 3000 and the energy storage device 200.

[0262] According to some embodiments of the present application, the present application also provides a charging network 1000, which includes a charging pile 300 and an energy storage device 200 according to any one of the above embodiments or an energy storage system 2000 according to any one of the above embodiments, and the energy storage device 200 is used for providing electric energy for the charging pile 300.

[0263] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described.

[0264] Please refer to Figures 6 to 16 According to some embodiments of the present application, the present application provides a battery cell 1, comprising a shell 10, an electrode assembly 20, a separator 30 and a blocking member 50, the shell comprising a shell body 110 and an end cover 120, the shell body 110 having an opening 1101, the end cover 120 covering the opening 1101 and comprising a first shell wall 11, wherein the first direction X is the thickness direction of the end cover 120, the second direction Y is the length direction of the end cover 120, and the third direction Z is the width direction of the end cover 120.

[0265] The electrode assembly 20 is accommodated in an accommodation cavity 1102 of the shell 10, the electrode assembly 20 comprising a main body 21 and first and second tabs 22 and 23 connected to the main body 21, the separator 30 being arranged on a side of the first shell wall 11 facing the electrode assembly 20, a side surface of the first shell wall 11 facing the separator 30 being recessed inward to form a groove, a groove bottom wall 111 of the groove protruding from the first shell wall 11 toward a side away from the separator 30, and the groove bottom wall 111 being provided with a pressure relief mechanism 40. Along the first direction X, the separator 30 has a first face 301 facing the first shell wall 11 and a second face 302 facing away from the first shell wall 11, and along the third direction Z, the separator 30 has third and fourth faces 303 and 304 facing opposite directions.

[0266] The separator 30 is provided with a recess 31 recessed along the direction from the first face 301 to the second face 302, along the first direction X, a side surface of the recess 31 away from the first shell wall 11 protrudes from the second face 302, at least part of the first tab 22 is arranged on one side of the recess 31 along the second direction Y, and at least part of the second tab 23 is arranged on the other side of the recess 31 along the second direction Y. A pressure relief channel 101 is formed between the groove and the recess 31, the recess 31 comprises a bottom wall 320 and a side wall 310, the bottom wall 320 and the first shell wall 11 are oppositely arranged along the first direction X, the bottom wall 320 is a closed structure, the side wall 310 is located between the bottom wall 320 and the first shell wall 11, the side wall 310 comprises first and second walls 311 and 312 opposite along the third direction Z, and third and fourth walls 313 and 314 opposite along the second direction Y, at least one of the first, second, third and fourth walls 311, 312, 313 and 314 is provided with a through hole 3101 communicating the accommodation cavity 1102 and the pressure relief channel 101, and the through hole 3101 is located on a side of the second face 302 away from the first face 301 along the first direction X, and the axial direction of the through hole 3101 is perpendicular to the first direction X.

[0267] The isolation piece 30 is further provided with a protrusion 32 on both sides along the second direction Y, the protrusion 32 protrudes from the second surface 302 to a side away from the first surface 301, the protrusion 32 has a cavity and a via hole 321 in communication with the cavity, and the protrusion 32 is provided with the via hole 321 on both sides along the first direction X and both sides along the second direction Y. In the same projection plane perpendicular to the first direction X, the orthogonal projection of the recess 31 is any one of a polygon, a curve, a circle and an ellipse, and the orthogonal projection of the pressure relief channel 101 is any one of a polygon, a curve, a circle and an ellipse.

[0268] Optionally, the third surface 303 is closer to the first wall 311 than the fourth surface 304, and the fourth surface 304 is closer to the second wall 312 than the third surface 303. Along the third direction Z, the third surface 303 protrudes from a side surface of the first wall 311 away from the pressure relief channel 101, and the first wall 311 is provided with a through hole 3101; and / or, the fourth surface 304 protrudes from a side surface of the second wall 312 away from the pressure relief channel 101, and the second wall 312 is provided with a through hole 3101.

[0269] Optionally, the blocking member 50 is connected between the first shell wall 11 and the recess 31, and divides the pressure relief channel 101 into the first channel 1011, the second channel 1012 and the third channel 1013 in communication, the blocking member 50 is an integral structure with the isolation piece 30. At least one of the first wall 311, the second wall 312, the third wall 313 and the fourth wall 314 is provided with a through hole 3101 in communication with the first channel 1011, at least one of the first wall 311, the second wall 312, the third wall 313 and the fourth wall 314 is provided with a through hole 3101 in communication with the third channel 1013, and the pressure relief mechanism 40 is in communication with the second channel 1012.

[0270] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0271] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized by, The application relates to a battery, comprising: a housing having a first housing wall provided with a pressure relief mechanism; an electrode assembly accommodated in an accommodation cavity of the housing; a spacer arranged on a side of the first housing wall facing the electrode assembly in a first direction, the spacer having a first surface facing the first housing wall and a second surface facing away from the first housing wall, the spacer being provided with a recess recessed from the first surface to the second surface, a pressure relief passage being formed between the first housing wall and the recess, the pressure relief mechanism being configured to communicate with the pressure relief passage in a pressure relief state, the recess being provided with a through hole communicating the accommodation cavity with the pressure relief passage; a blocking member arranged in the pressure relief passage and connected to at least one of the first housing wall and the recess.

2. The battery cell of claim 1, wherein, An axial direction of the through hole intersects the first direction.

3. The battery cell according to claim 1 or 2, characterized in that, In the first direction, a side of the recess opposite to the first housing wall is in a closed structure, and a circumferential side of the recess is provided with the through hole.

4. The battery cell according to claim 1 or 2, characterized in that, In the same projection plane perpendicular to the first direction, a projection of the pressure relief mechanism is completely offset from a projection of the blocking member.

5. The battery cell according to claim 1 or 2, characterized in that, In the first direction, a side surface of the recess facing away from the first housing wall protrudes from the second surface.

6. The battery cell of claim 5, wherein, The electrode assembly comprises a main body and first and second tabs connected to the main body, at least part of the first tab being arranged on one side of the recess in a second direction, and at least part of the second tab being arranged on the other side of the recess in the second direction, the first direction intersecting the second direction.

7. The battery cell of claim 6, wherein, In a third direction, the recess has oppositely arranged first and second walls, and the spacer has oppositely facing third and fourth surfaces, the third surface being closer to the first wall than the fourth surface, and the fourth surface being closer to the second wall than the third surface. In the third direction, the third surface protrudes from a side surface of the first wall facing away from the pressure relief passage, and the first wall is provided with the through hole; and / or, the fourth surface protrudes from a side surface of the second wall facing away from the pressure relief passage, and the second wall is provided with the through hole; the first direction, the second direction and the third direction intersect each other.

8. The battery cell according to claim 1 or 2, characterized in that, In the same projection plane perpendicular to the first direction, a projection of the recess is in any one of a polygonal shape, a curved shape, a circular shape and an elliptical shape. In the same projection plane perpendicular to the first direction, a projection of the pressure relief passage is in any one of a polygonal shape, a curved shape, a circular shape and an elliptical shape.

9. The battery cell according to claim 1 or 2, characterized in that, The blocking member is connected to the first housing wall and the recess, and divides the pressure relief passage into a plurality of sub-passages in communication with each other, the recess is provided with the through hole communicating with at least one of the sub-passages, and the pressure relief mechanism communicates with at least one of the sub-passages.

10. The battery cell of claim 9, wherein, The plurality of sub-passages comprises a first passage and a second passage, the recess is provided with the through hole communicating with the first passage, and the pressure relief mechanism communicates with the second passage.

11. The battery cell of claim 9, wherein, The plurality of sub-channels include a first channel, a second channel, and a third channel, the recess is provided with the through hole in communication with the first channel and the through hole in communication with the third channel, and the pressure relief mechanism is in communication with the second channel.

12. The battery cell of claim 11, wherein, The recess has a bottom wall and a side wall connected to each other, the bottom wall is arranged opposite to the first shell wall along the first direction, and the side wall is located between the bottom wall and the first shell wall, and the blocking member is connected to the first shell wall and the bottom wall.

13. The battery cell of claim 12, wherein, The blocking member includes a first blocking piece and a second blocking piece spaced apart along a third direction, the first channel, the second channel, and the third channel are arranged along the third direction, and the side wall includes a first wall and a second wall opposite to each other along the third direction, and a third wall and a fourth wall opposite to each other along a second direction. The first blocking piece is connected to at least one of the first wall, the second wall, the third wall, and the fourth wall, and the second blocking piece is connected to at least one of the first wall, the second wall, the third wall, and the fourth wall, and the first direction, the second direction, and the third direction intersect with each other.

14. The battery cell of claim 13, wherein, The first blocking piece is connected to the third wall and spaced apart from the fourth wall, and the third wall is provided with the through hole in communication with the first channel. And / or, the second blocking piece is connected to the fourth wall and spaced apart from the third wall, and the fourth wall is provided with the through hole in communication with the third channel.

15. The battery cell of claim 14, wherein, The blocking member further includes a third blocking piece and a fourth blocking piece spaced apart along a third direction, the third blocking piece is arranged on a side of the first blocking piece facing the second blocking piece, the third blocking piece is connected to the fourth wall and spaced apart from the third wall, and a side of the first blocking piece facing away from the third blocking piece is provided with the through hole along the third direction. The fourth blocking piece is arranged on a side of the second blocking piece facing the first blocking piece, the fourth blocking piece is connected to the third wall and spaced apart from the fourth wall, and a side of the second blocking piece facing away from the fourth blocking piece is provided with the through hole along the third direction.

16. The battery cell of claim 13, wherein, The first blocking piece includes a first blocking part and a second blocking part spaced apart, the first blocking part is connected to the third wall, and the second blocking part is connected to the fourth wall. And / or, the second blocking piece includes a third blocking part and a fourth blocking part spaced apart, the third blocking part is connected to the third wall, and the fourth blocking part is connected to the fourth wall.

17. The battery cell of claim 13, wherein, The first blocking piece includes a first blocking part and a second blocking part, the second blocking part extends along the second direction, the first blocking part extends along the first direction and is connected between the first wall and the second blocking part, and the second blocking part is spaced apart from the third wall and the fourth wall, respectively. The second blocking member comprises a third blocking portion and a fourth blocking portion, the fourth blocking portion extends along the second direction, the third blocking portion extends along the first direction and is connected between the second wall and the fourth blocking portion, and the fourth blocking portion is spaced apart from the third wall and the fourth wall, respectively.

18. The battery cell of claim 16 or 17, wherein, At least one of the third wall and the fourth wall is provided with the through hole which communicates with the first channel, and at least one of the third wall and the fourth wall is provided with the through hole which communicates with the third channel.

19. The battery cell of claim 12, wherein, The blocking member comprises a first blocking member and a second blocking member which are spaced apart along a second direction, the first channel, the second channel and the third channel are arranged along the second direction, the side wall comprises a first wall and a second wall which are opposite along a third direction, and a third wall and a fourth wall which are opposite along the second direction. The first blocking member is closer to the third wall than the second blocking member, the third wall is provided with the through hole which communicates with the first channel, and the through hole is opposite to the first blocking member along the second direction. The second blocking member is closer to the fourth wall than the first blocking member, the fourth wall is provided with the through hole which communicates with the third channel, and the through hole is opposite to the second blocking member along the second direction, and the first direction, the second direction and the third direction intersect with each other.

20. The battery cell of claim 19, wherein, The first blocking member is spaced apart from the first wall, the second wall, the third wall and the fourth wall, respectively; and / or, the second blocking member is spaced apart from the first wall, the second wall, the third wall and the fourth wall, respectively.

21. The battery cell of claim 1 or 2, wherein, The first shell wall is recessed inwardly to form a groove on a side surface of the isolation member, the groove and the recess form the pressure relief channel, a groove bottom wall of the groove protrudes from the first shell wall away from a side of the isolation member, and the groove bottom wall is provided with the pressure relief mechanism.

22. The battery cell of claim 5, wherein, The isolation member is further provided with a protrusion on each side along a second direction, the protrusion protrudes from the second surface away from the first surface, the protrusion has a cavity and a via hole which communicates with the cavity, and along the second direction, a side surface of the protrusion which faces the recess is provided with the via hole; At least one side of the protrusion along the first direction is provided with the via hole, and / or, along the second direction, a side surface of the protrusion which faces away from the recess is provided with the via hole, and the first direction intersects with the second direction.

23. The battery cell of claim 1 or 2, wherein, The shell comprises a shell body and an end cover, the shell body has an opening, the end cover covers the opening, and the end cover comprises the first shell wall.

24. A battery device, characterized by A plurality of battery cells according to any one of claims 1 to 23.

25. An energy storage device, comprising: A plurality of battery cells according to any one of claims 1 to 23 or a plurality of battery devices as claimed in claim 24 are used for storing or providing electric energy.

26. An energy storage system, comprising: A power conversion device is used for electrically connecting a power generation device and the energy storage device as claimed in claim 25.

27. A charging network characterized by, comprising a charging post and an energy storage device as claimed in claim 25 or an energy storage system as claimed in claim 26, the energy storage device being used to provide electrical energy for the charging post.

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