Battery cell assembly, battery device, and electric apparatus

Abstract

Provided in the embodiments of the present application are a battery cell assembly, a battery device, and an electric apparatus. The battery comprises a housing and a plurality of battery cells, wherein the housing comprises a first wall, which is provided with a pressure relief port; the plurality of battery cells are arranged side by side inside the housing, and are electrically connected; and each battery cell has a pressure relief area, and at least part of the pressure relief area of each battery cell directly faces the first wall, such that emissions in the pressure relief area can be discharged from the housing via the pressure relief port. The technical solution provided in the present application can improve the reliability of a battery.

Description

Battery monomer assembly, battery device and electric equipment Cross-reference to related applications

[0001] The present application claims priority to Chinese Patent Application No. CN202411045542.0, filed on July 31, 2024, entitled "Battery monomer assembly, battery device and electric equipment", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery device, in particular to a battery monomer assembly, a battery device and an electric equipment. BACKGROUND

[0003] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0004] In the manufacturing process of the battery monomer assembly, the reliability of the battery monomer assembly is a problem that cannot be ignored. Therefore, how to improve the reliability of the battery is a technical problem that needs to be solved in battery technology. SUMMARY

[0005] The present application provides a battery monomer assembly, a battery device and an electric equipment, which can improve the reliability of the battery monomer assembly.

[0006] The present application is achieved by the following technical solutions:

[0007] In a first aspect, the present application provides a battery monomer assembly, which comprises a shell and a plurality of battery monomers. The shell comprises a first wall provided with a pressure relief port, and the plurality of battery monomers are arranged side by side in the shell and electrically connected. Each battery monomer has a pressure relief area, and the pressure relief area of each battery monomer is at least partially arranged opposite to the first wall, so that the discharge of the pressure relief area can be discharged from the shell through the pressure relief port.

[0008] According to the battery monomer assembly of the present application, the pressure relief area is at least partially arranged opposite to the first wall, and when the pressure relief area discharges the discharge, the discharge can be discharged from the shell through the pressure relief port, which facilitates the rapid discharge of the discharge from the shell, reduces the influence of the discharge on the adjacent battery monomers, reduces the risk of heat spread, and improves the reliability of the battery monomer assembly.

[0009] According to some embodiments of the present application, the battery cell comprises a shell and an electrode assembly arranged in the shell, the shell is made of any one of an aluminum plastic film, an aluminum alloy or a steel; when the shell is made of the aluminum plastic film, the edge sealing position of the aluminum plastic film hot melt packaging the electrode assembly forms a pressure relief area; when the shell is made of the aluminum alloy or the steel, a weak part on the shell forms the pressure relief area.

[0010] In the above scheme, when the shell is made of the aluminum plastic film, the edge sealing position of the aluminum plastic film hot melt packaging the electrode assembly is easy to break when the pressure inside the shell is too large, so as to form the pressure relief area; when the shell is made of the aluminum alloy or the steel, the weak part on the shell is easy to break when the pressure inside the shell is too large, so as to form the pressure relief area.

[0011] According to some embodiments of the present application, the shell is made of the aluminum plastic film, the aluminum plastic film forms the pressure relief area on three edges in the circumferential direction of the electrode assembly, and two of the three edges are used for the tab of the electrode assembly to extend out, and the pressure relief area formed by the remaining one of the three edges is opposite to the first wall.

[0012] In the above scheme, the aluminum plastic film forms the pressure relief area on three edges in the circumferential direction of the electrode assembly, the tabs extend out from two of the three edges, so as to be connected with the electrode lead-out piece; the pressure relief area of the remaining one of the three edges is opposite to the first wall, so that the exhaust from the pressure relief area can be quickly discharged out of the shell from the pressure relief port.

[0013] According to some embodiments of the present application, the shell is made of the aluminum alloy or the steel, and the weak part on the shell is a thickness reduction area or a region provided with a notch.

[0014] In the above scheme, the thickness reduction area or the region provided with the notch can break when the pressure inside the shell is too large, so as to discharge the exhaust out of the shell and facilitate the pressure relief of the shell.

[0015] According to some embodiments of the present application, the shell is a closed shell or a non-closed shell; and / or, the material strength of the shell is higher than that of the aluminum plastic film.

[0016] In the above scheme, when the shell is a closed shell, the pressure relief port communicates the inside and the outside of the shell, the pressure relief area is at least partially arranged opposite to the first wall, and the exhaust of the pressure relief area can be quickly discharged out of the shell from the pressure relief port. When the shell is a non-closed shell, the assembly of the shell is facilitated, and the processing and manufacturing difficulty is relatively low. When the material strength of the shell is higher than that of the aluminum plastic film, the shell is not easy to be damaged by external components or external force, so as to improve the reliability of the battery cell assembly.

[0017] According to some embodiments of the present application, the first wall is the wall with the highest height among all the wall positions of the shell.

[0018] In the above scheme, the first wall can be a wall body of the top, facilitating the discharge of the discharge.

[0019] According to some embodiments of the present application, the battery cell assembly satisfies any one of the following conditions: (1) the shell includes two end plates, two side plates, a top plate, and a bottom plate, the two side plates are oppositely arranged along a first direction, the two end plates are oppositely arranged along a second direction, the top plate and the bottom plate are oppositely arranged along a third direction, the two end plates, the two side plates, the top plate, and the bottom plate collectively enclose a containing cavity accommodating the plurality of battery cells, the first direction, the second direction, and the third direction are perpendicular to each other, the top plate is the first wall, and the third direction is parallel to the thickness direction of the first wall; (2) the shell includes two end plates, a top plate, and at least one binding member, the two end plates are oppositely arranged along the second direction, the binding member and the two end plates bind the plurality of battery cells, along the third direction, the top plate is connected to one end of the two end plates, and the top plate is the first wall; (3) the shell includes a semi-enclosed box body and a top plate covering an open position of the semi-enclosed box body, and the top plate is the first wall.

[0020] In the above scheme, when the shell includes two end plates, two side plates, a top plate, and a bottom plate, the two end plates, the two side plates, the top plate, and the bottom plate collectively enclose a containing cavity, facilitating the assembly of the battery cells and the shell. When the shell includes two end plates, a top plate, and at least one binding member, the plurality of battery cells are bound by the binding member and the two end plates, facilitating the constraint of the plurality of battery cells and reducing the risk of movement of the battery cells, the top plate is connected to the top of the two end plates, and the shell can constitute a non-enclosed shell, facilitating processing and manufacturing. When the shell includes a semi-enclosed box body and a top plate covering an open position of the semi-enclosed box body, the structure is simple and facilitates assembly.

[0021] According to some embodiments of the present application, the extension trajectory of the wall surface enclosing the pressure relief port is a straight line and / or an arc.

[0022] In the above scheme, the pressure relief port has various forms, and the shape of the pressure relief port can be at least one of a rectangle, a circle, an elongated strip, a double Y shape, or a straight line, facilitating processing and manufacturing.

[0023] According to some embodiments of the present application, the battery cell assembly further includes an insulating member, at least a portion of the insulating member being arranged between the first wall and the battery cells. The insulating member is provided with a first weak area, and the projection of the first weak area overlaps at least partially with the pressure relief port along the thickness direction of the first wall.

[0024] In the above scheme, the insulating piece is used to insulate and separate the battery monomer and the first wall, and the insulating piece has a lower strength; a first weak area is arranged on the insulating piece, and the first weak area has a lower strength, and when the battery monomer is in thermal runaway, the first weak area is easily damaged by the discharge of the battery monomer (such as high-temperature and high-pressure gas), so that the discharge can quickly pass through the pressure relief port and be discharged to the outside of the shell, facilitating rapid pressure relief, reducing the influence of the discharge on adjacent battery monomers, reducing the risk of heat spread, and improving the reliability of the battery monomer assembly.

[0025] According to some embodiments of the present application, the insulating piece comprises a body portion and a protruding portion corresponding to the pressure relief port, the body portion has a first surface facing away from the battery monomer, and the protruding portion protrudes from the first surface, at least a part of the protruding portion is located in the pressure relief port, and the first weak area is arranged on the protruding portion.

[0026] In the above scheme, the protruding portion protrudes from the first surface, and at least a part of the protruding portion is located in the pressure relief port, which can reduce the space occupation of the protruding portion on one hand, and facilitate the discharge of the discharge to the outside of the shell on the other hand.

[0027] According to some embodiments of the present application, a recess is formed on the side of the insulating piece away from the first wall, and the recess corresponds in position to the protruding portion.

[0028] In the above scheme, the recess is arranged, so that the insulating piece can be integrally formed (such as injection molding), the insulating piece has a higher overall strength, and the processing and manufacturing are facilitated, and at the same time, the protruding portion can have a thinner wall thickness, so that the first weak area can be damaged when the battery monomer is in thermal runaway to quickly release pressure.

[0029] According to some embodiments of the present application, the protruding portion comprises a top wall and a side wall, the side wall is arranged around the periphery of the top wall, the side wall connects the top wall and the body portion, the thickness of the top wall is less than the thickness of the body portion, and the top wall forms the first weak area.

[0030] In the above scheme, the inner surface of the top wall and the inner surface of the side wall surround the recess, the thickness of the top wall is less than the thickness of the body portion, the top wall forms the first weak area, and the first weak area can be damaged before the body portion when the battery monomer is in thermal runaway, so as to facilitate rapid pressure relief.

[0031] According to some embodiments of the present application, the first weak area is provided with a first notch or a first gap.

[0032] In the above scheme, the first weak area is provided with a first notch or a first gap, and when the battery monomer is in thermal runaway, the discharge of the battery monomer can quickly break through the first notch or the first gap to damage the first weak area to form a pressure relief channel, thereby facilitating rapid pressure relief.

[0033] According to some embodiments of the present application, a plurality of battery monomers are arranged in a stacked manner along a first direction, and the first direction is perpendicular to the thickness direction of the first wall.

[0034] In the above scheme, the plurality of battery monomers are arranged in a stacked manner along the first direction, so that the space inside the shell in the first direction can be reasonably utilized, and the energy density of the battery monomer assembly can be improved.

[0035] According to some embodiments of the present application, the first wall is provided with at least one column of pressure relief openings, and each column of pressure relief openings includes a plurality of pressure relief openings arranged at intervals along the first direction.

[0036] In the above scheme, each column of pressure relief openings includes a plurality of pressure relief openings arranged at intervals along the first direction, and the plurality of pressure relief openings can correspond to the plurality of battery monomers, so that the battery monomers can be quickly relieved in the first direction when the battery monomers are in thermal runaway.

[0037] According to some embodiments of the present application, the number of pressure relief openings in each column of pressure relief openings is M, the number of battery monomers is a plurality, and the number of battery monomers is N, which satisfies M≥0.5*N.

[0038] In the above scheme, the number of battery monomers and the number of pressure relief openings in each column of pressure relief openings satisfy the above relationship, on the one hand, the plurality of battery monomers can share one pressure relief opening, so that the battery monomers can be quickly relieved when the battery monomers are in thermal runaway, and on the other hand, the insulating member has high overall strength.

[0039] According to some embodiments of the present application, the first wall is provided with at least one row of pressure relief openings, and each row of pressure relief openings includes a plurality of pressure relief openings arranged at intervals along the second direction, and the second direction, the first direction and the thickness direction of the first wall are perpendicular to each other.

[0040] In the above scheme, each row of pressure relief openings includes a plurality of pressure relief openings arranged at intervals along the second direction, so that when the battery monomers are in thermal runaway, the discharge of the battery monomers can be quickly discharged in the second direction.

[0041] According to some embodiments of the present application, the first weak area and the pressure relief opening are each provided with a plurality of the first weak area and the pressure relief opening.

[0042] In the above scheme, the plurality of first weak areas and the plurality of pressure relief openings are one-to-one corresponding, and each first weak area corresponds to one pressure relief opening, so that the discharge can be quickly discharged when the battery monomers are in thermal runaway.

[0043] According to some embodiments of the present application, the battery monomer assembly further comprises: a heat insulation pad arranged on the outer surface of the first wall, and the heat insulation pad is provided with a second weak area, and the projection of the second weak area at least partially overlaps with the pressure relief opening along the thickness direction of the first wall.

[0044] In the above scheme, the setting of the heat insulation pad can reduce the influence of high-temperature gas from the outside of the shell on the shell and the battery monomer, for example, can block the high-temperature gas discharged by the battery monomer in thermal runaway from entering the shell through the pressure relief port in the area not in thermal runaway, and reduce the risk of thermal spread. At the same time, the setting of the second weak area can facilitate the discharge of high-temperature and high-pressure emissions towards the outside of the battery monomer assembly, and realize one-way pressure relief.

[0045] According to some embodiments of the present application, the heat insulation pad is provided with a second notch or a second gap, and the second notch or the second gap surrounds the second weak area.

[0046] In the above scheme, the setting of the second notch or the second gap can facilitate the rapid breaking of the heat insulation pad by the emissions discharged from the pressure relief port towards the outside, and facilitate rapid pressure relief.

[0047] According to some embodiments of the present application, the second weak area and the pressure relief port are each provided with a plurality of the second weak areas and the pressure relief ports correspond one by one.

[0048] In the above scheme, each second weak area is provided corresponding to one pressure relief port, which can facilitate the directional discharge of the emissions discharged from the pressure relief port towards the outside.

[0049] According to some embodiments of the present application, the melting point of the heat insulation pad is greater than the melting point of the first wall.

[0050] In the above scheme, the melting point of the heat insulation pad is greater than the melting point of the first wall, and the heat insulation pad covers the non-pressure relief part of the shell, which can reduce the risk of emissions discharged by the battery monomer in thermal runaway spouting from the non-pressure relief part, so as to facilitate directional pressure relief.

[0051] According to some embodiments of the present application, the battery monomer is a soft pack battery monomer.

[0052] In the above scheme, the battery monomer is a soft pack battery monomer, which can reasonably utilize the space inside the shell, and the battery can have a higher energy density.

[0053] According to some embodiments of the present application, the material strength of the first wall is greater than the material strength of the insulating piece.

[0054] In the above scheme, the material strength of the first wall is greater than the material strength of the insulating piece, and the first weak area is arranged on the insulating piece, so as to facilitate the rapid breaking of the insulating piece by the emissions discharged by the battery monomer in thermal runaway, to realize rapid and directional pressure relief, and improve the reliability of the battery.

[0055] According to some embodiments of the present application, the shell comprises an outer frame and an end plate, the battery monomer is arranged in the outer frame, the outer frame has an opening, the end plate closes the opening, and the first wall is a wall body of the outer frame.

[0056] In the above scheme, the outer frame and the end plate cooperate to form a protective structure to reduce the risk of the battery monomer being damaged by external components; the first wall is a wall of the outer frame to facilitate the discharge of the discharge.

[0057] In a second aspect, the embodiments of the present application further provide a battery device comprising the battery monomer assembly according to any of the above embodiments. According to some embodiments of the present application, the battery device further comprises a box body and an upper cover, the upper cover being fastened with the box body, the first wall of all the battery monomer assemblies being integrally formed and constituting the upper cover.

[0058] In the above scheme, the first wall of all the battery monomer assemblies is integrally formed, and the plurality of battery monomer assemblies share one upper cover, facilitating processing and manufacturing.

[0059] In a third aspect, the embodiments of the present application further provide a use-electricity device comprising the battery monomer assembly or the battery device according to any of the above embodiments, the battery monomer assembly or the battery device being used to provide electric energy.

[0060] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0061] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0062] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0063] FIG. 2 is a structural exploded schematic diagram of a battery monomer assembly according to some embodiments of the present application;

[0064] FIG. 3 is a sectional view of the battery monomer assembly according to some embodiments of the present application;

[0065] FIG. 4 is a partial enlarged view of A in FIG. 3;

[0066] FIG. 5 is a structural schematic diagram of a battery monomer according to some embodiments of the present application;

[0067] FIG. 6 is an assembly schematic diagram of a non-closed shell and a battery monomer according to some embodiments of the present application;

[0068] FIG. 7 is a structural schematic diagram of a shell according to some embodiments of the present application;

[0069] Fig. 8 is a structural schematic diagram of a housing according to some embodiments of the present application;

[0070] Fig. 9 is a structural schematic diagram of a housing according to some embodiments of the present application;

[0071] Fig. 10 is a structural schematic diagram of a pressure relief port according to some embodiments of the present application;

[0072] Fig. 11 is a structural schematic diagram of a pressure relief port according to some embodiments of the present application;

[0073] Fig. 12 is a structural schematic diagram of a first weak area according to some embodiments of the present application;

[0074] Fig. 13 is a structural schematic diagram of a first weak area according to some embodiments of the present application;

[0075] Fig. 14 is a structural schematic diagram of a first weak area according to some embodiments of the present application;

[0076] Fig. 15 is a structural schematic diagram of a protrusion according to some embodiments of the present application;

[0077] Fig. 16 is a structural exploded schematic diagram of a battery cell assembly according to some embodiments of the present application;

[0078] Fig. 17 is a sectional view of a battery cell assembly according to some embodiments of the present application;

[0079] Fig. 18 is an enlarged view of a portion of Fig. 17 at B;

[0080] In the drawings, the drawings are not necessarily drawn to scale.

[0081] Label Explanation: 100 - battery device; 1 - battery cell assembly; 10 - housing; 11 - first wall; 111 - pressure relief port; 12 - outer frame; 13 - end plate; 14 - side plate; 15 - top plate; 16 - bottom plate; 17 - binding member; 18 - semi-enclosed box; 20 - battery cell; 21 - pressure relief area; 22 - shell; 30 - insulating member; 31 - first weak area; 311 - first score; 312 - first gap; 32 - body portion; 321 - first surface; 322 - second surface; 33 - protrusion; 331 - top wall; 332 - side wall; 34 - recess; 40 - thermal insulation pad; 41 - second weak area; 42 - second gap; 200 - controller; 300 - motor; 1000 - vehicle; X - first direction; Y - second direction; Z - thickness direction of the first wall. DETAILED DESCRIPTION

[0082] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application 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.

[0083] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0084] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor are they necessarily mutually exclusive or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0085] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0086] In the present application, the term "and / or" 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 mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0087] "Multiple" appearing in the present application means two or more (including two), and similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0088] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0089] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0090] In some embodiments, the battery device can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0091] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0092] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0093] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that a closed space is formed inside the box to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0094] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected with the frame, respectively, so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0095] As an example, the box can be part of the chassis structure of a vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0096] In some embodiments, the battery device refers to an energy storage device, which includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0097] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0098] The battery cell can be, but is not limited to, 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-acid battery, etc.

[0099] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, 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, and can prevent the positive electrode and the negative electrode from short-circuiting while allowing the active ions to pass through.

[0100] In some embodiments, the battery cell can include a package. The package is used to encapsulate components such as the electrode assembly and the electrolyte. The package can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0101] In some embodiments, at least one electrode terminal is disposed on the package, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab, or can be indirectly connected to the tab through an adapter.

[0102] In some embodiments, a battery cell assembly includes a housing and a plurality of battery cells disposed in the housing. Generally, the housing encloses a closed space to protect the battery cells inside from external damage. However, due to the high strength of the housing, when the battery cells undergo thermal runaway, the vented discharge cannot quickly break through the housing, which can cause thermal runaway of adjacent battery cells, leading to thermal propagation, and thus reducing the reliability of the battery.

[0103] In view of this, the embodiments of the present application provide a battery cell assembly including a housing and a plurality of battery cells. The housing includes a first wall provided with a pressure relief port; the plurality of battery cells are arranged side by side in the housing and are electrically connected. Each battery cell has a pressure relief area, and the pressure relief area of each battery cell is at least partially disposed opposite the first wall, so that the discharge of the pressure relief area can be discharged from the housing through the pressure relief port. The battery can quickly relieve pressure and has high reliability.

[0104] In such a battery cell assembly, the first wall is provided with a pressure relief port, the pressure relief port communicates the inner side and the outer side of the first wall, and the pressure relief area of the battery cell is at least partially disposed opposite the first wall. When the pressure relief area discharges the discharge, the discharge can be discharged from the housing through the pressure relief port, so as to quickly discharge the discharge from the housing, reduce the influence of the discharge on adjacent battery cells, reduce the risk of thermal propagation, and improve the reliability of the battery cell assembly.

[0105] The battery device disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship, or an aircraft. The power supply system of the electric device can be composed of the battery device disclosed in the present application.

[0106] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers and battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft including airplanes, rockets, space shuttles and spaceships.

[0107] The following embodiments are described for convenience with a vehicle as an example of an electric device according to an embodiment of the present application.

[0108] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, for example, for the working power demand of the circuit system of the vehicle 1000, for example, for the working power demand of the starting, navigation and running of the vehicle 1000.

[0109] The vehicle 1000 can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the starting, navigation and running of the vehicle 1000.

[0110] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0111] According to some embodiments of the present application, the battery device 100 can include one or more battery monomer assemblies for providing voltage and capacity. The battery monomer assembly can include a plurality of battery monomers connected in series, in parallel or in a mixed manner through a busbar component.

[0112] Please refer to FIG. 2 to FIG. 4, FIG. 2 is a structural exploded schematic diagram of a battery monomer assembly provided by some embodiments of the present application, FIG. 3 is a sectional view of the battery monomer assembly provided by some embodiments of the present application, and FIG. 4 is a partial enlarged view of A in FIG. 3.

[0113] According to some embodiments of the present application, a battery cell assembly 1 is provided, which includes a housing 10 and a plurality of battery cells 20. The housing 10 includes a first wall 11 provided with a pressure relief port 111. The plurality of battery cells 20 are arranged side by side in the housing 10 and are electrically connected. Each battery cell 20 has a pressure relief area 21, and the pressure relief area 21 of each battery cell 20 is at least partially arranged opposite the first wall 11, so that the discharge of the pressure relief area 21 can be discharged from the housing 10 through the pressure relief port 111.

[0114] The housing 10 is used to enclose a containing cavity for containing the battery cells 20, and the housing 10 can protect the battery cells 20 from being damaged by external forces.

[0115] The first wall 11 is one wall of the housing 10.

[0116] The pressure relief port 111 can be an opening formed in the first wall 11, and the pressure relief port 111 can penetrate the first wall 11 along the thickness direction Z of the first wall 11, so as to communicate the inside and outside of the housing 10.

[0117] The shape of the pressure relief port 111 can be various forms, such as rectangular, oval, circular or other shapes.

[0118] The battery cells 20 are contained in the containing cavity formed by the housing 10.

[0119] The plurality of battery cells 20 can be connected in series or in parallel or in a mixed manner, and the mixed manner means that the plurality of battery cells 20 are connected in series and in parallel. The battery cell assembly 1 can also include other structures, for example, the battery cell assembly 1 can also include a busbar component for realizing the electrical connection between the plurality of battery cells 20.

[0120] The battery cells 20 can be secondary batteries or primary batteries; the battery cells 20 can also be lithium-sulfur batteries, sodium-ion batteries or magnesium-ion batteries, but are not limited thereto.

[0121] As shown in FIGS. 3 and 4, the plurality of battery cells 20 are arranged side by side along the first direction X.

[0122] When the battery cells 20 are in thermal runaway, the pressure relief area discharges high-temperature and high-pressure discharge to release the internal pressure of the battery cells 20. The discharge from the battery cells 20 mentioned in the present application includes but is not limited to: electrolyte, positive and negative electrode sheets dissolved or decomposed, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flame, etc.

[0123] The pressure relief area 21 of each battery cell 20 is arranged at least partially opposite the first wall 11. A portion of the pressure relief area 21 can be arranged opposite the first wall 11, or the entire pressure relief area 21 can be arranged opposite the first wall 11. Opposite here means that the orthogonal projection of the pressure relief area 21 overlaps the orthogonal projection of the first wall 11 in the same projection plane perpendicular to the thickness direction Z of the first wall. When the pressure relief area 21 is arranged opposite the first wall 11, the discharge of the pressure relief area 21 flows towards the first wall 11, and the discharge can be discharged from the housing 10 through the pressure relief port 111, since the pressure relief port 111 connects the inner side and the outer side of the first wall 11.

[0124] In some embodiments, the orthogonal projection of the pressure relief area 21 at least partially overlaps the pressure relief port 111 in the same projection plane perpendicular to the thickness direction Z of the first wall. In this case, the discharge of the pressure relief area 21 can quickly be discharged from the housing 10 through the pressure relief port 111.

[0125] According to the battery cell assembly 1 of the embodiments of the present application, the pressure relief area 21 is arranged at least partially opposite the first wall 11. When the pressure relief area 21 discharges, the discharge can be discharged from the housing 10 through the pressure relief port 111, which facilitates the quick discharge of the discharge from the housing 10, reduces the influence of the discharge on adjacent battery cells 20, reduces the risk of heat spread, and improves the reliability of the battery cell assembly 1.

[0126] Please refer to FIG. 4 and FIG. 5, which is a structural schematic diagram of a battery cell according to some embodiments of the present application. According to some embodiments of the present application, the battery cell 20 comprises a housing 22 and an electrode assembly arranged in the housing 22, and the material of the housing 22 is any one of aluminum plastic film, aluminum alloy or steel. As shown in FIG. 4, when the material of the housing 22 is aluminum plastic film, the heat sealing of the edge of the aluminum plastic film forms the pressure relief area 21; as shown in FIG. 5, when the material of the housing 22 is aluminum alloy or steel, the weak part on the housing 22 forms the pressure relief area 21.

[0127] The housing 22 encloses a closed space for accommodating the electrode assembly, and the electrode assembly is accommodated in the housing 22.

[0128] When the material of the housing 22 is aluminum plastic film, the battery cell 20 can be a soft-pack battery cell.

[0129] In the embodiment in which the material of the housing 22 is aluminum plastic film, the edge of the aluminum plastic film is heat sealed to form a closed space, and the edge of the heat sealing of the aluminum plastic film is prone to breakage when the battery cell 20 is in thermal runaway, so as to facilitate the discharge of the discharge from the housing 22 through the breakage of the edge, and thus the edge forms the pressure relief area 21.

[0130] When the material of the housing 22 is aluminum alloy or steel, the battery cell 20 can be a hard-shell battery cell, such as a cylindrical battery cell, a square battery cell, etc.

[0131] In the embodiments in which the material of the shell 22 is an aluminum alloy or steel, a weak portion is provided on the shell 22, which breaks when the battery cell 20 is in thermal runaway, so that the discharge material is discharged from the broken weak portion to the shell 22, and the weak portion forms the pressure relief area 21.

[0132] In the above scheme, when the material of the shell 22 is an aluminum plastic film, the three edges of the aluminum plastic film in the circumferential direction of the electrode assembly are heat-sealed, and two of the three edges are used for the tab of the electrode assembly to extend out, and the pressure relief area 21 formed by the remaining one of the three edges is opposite to the first wall 11.

[0133] According to some embodiments of the present application, the material of the shell 22 is an aluminum plastic film, and the three edges of the aluminum plastic film in the circumferential direction of the electrode assembly form the pressure relief area 21, and two of the three edges are used for the tab of the electrode assembly to extend out, and the pressure relief area 21 formed by the remaining one of the three edges is opposite to the first wall 11.

[0134] When the material of the shell 22 is an aluminum plastic film, in the assembly process of the aluminum plastic film and the electrode assembly, the three edges of the aluminum plastic film in the circumferential direction of the electrode assembly can be heat-sealed, and the tab of the electrode assembly can extend out from two of the three edges, so as to be connected to the electrode lead-out piece at different positions.

[0135] For example, the tab of the electrode assembly can extend out from the opposite two ends of the shell 22 in the second direction Y.

[0136] In the above scheme, the three edges of the aluminum plastic film in the circumferential direction of the electrode assembly form the pressure relief area 21, and the tab of the electrode assembly extends out from two of the three edges, so as to be connected to the electrode lead-out piece; and the pressure relief area 21 of the remaining one of the three edges is opposite to the first wall 11, so that the discharge material discharged from the pressure relief area 21 can be quickly discharged from the pressure relief port 111 to the shell 10.

[0137] According to some embodiments of the present application, the material of the shell 22 is an aluminum alloy or steel, and the weak portion on the shell 22 is a thickness-reduced area or a region provided with a notch.

[0138] When the material of the shell is an aluminum alloy or steel, the wall of the shell 22 can be partially thinned, the thickness of the partially thinned region is less than the thickness of the main part of the shell 22, and the thickness-reduced region forms the weak portion; or a notch is provided on the shell 22, the strength of the region where the notch is located is less than the strength of the main part of the shell 22, and the region where the notch is located forms the weak portion.

[0139] In the above scheme, the thickness-reduced area or the area provided with the score line can be broken when the pressure inside the shell 22 is too large, so as to facilitate the discharge of the discharge from the shell 22 and facilitate the pressure relief of the shell 22.

[0140] Please refer to FIG. 3, and further refer to FIG. 6, which is an assembly schematic diagram of a non-enclosed shell and a battery cell provided by some embodiments of the present application. According to some embodiments of the present application, the shell 10 is an enclosed shell or a non-enclosed shell; and / or, the material strength of the shell 10 is higher than the strength of the aluminum plastic film.

[0141] The shell 22 of the battery cell 20 forms a closed space to avoid leakage of the electrolyte.

[0142] The shell 10 can be an enclosed shell, or the shell 10 can also be a non-enclosed shell.

[0143] As shown in FIG. 3, when the shell 10 is an enclosed shell, the pressure relief port 111 communicates the inside and the outside of the shell 10, and the pressure relief area 21 is at least partially arranged opposite to the first wall 11, and the discharge of the pressure relief area 21 can be quickly discharged from the shell 10 through the pressure relief port 111.

[0144] As shown in FIG. 6, when the shell 10 is a non-enclosed shell, it is convenient for the assembly of the shell 10, and the processing and manufacturing difficulty is relatively low.

[0145] The shell 10 is used to protect the battery cell 20, and the shell 10 needs to have a certain strength. The material of the shell 10 can be a metal such as aluminum alloy, steel, or a carbon fiber resin composite material.

[0146] When the material strength of the shell 10 is higher than the strength of the aluminum plastic film, the shell 10 is not easy to be damaged by external components or external force, and the reliability of the battery cell assembly 1 can be improved.

[0147] According to some embodiments of the present application, the first wall 11 is the highest wall among all wall positions of the shell 10.

[0148] The first wall 11 can be the wall of the top of the battery cell assembly 1, and the first wall 11 can be located above the battery cell 20.

[0149] In the above scheme, the first wall 11 can be a top wall, which is convenient for the discharge of the discharge.

[0150] Referring to FIGS. 7-9, FIG. 7 is a structural schematic diagram of a shell according to some embodiments of the present application, FIG. 8 is a structural schematic diagram of a shell according to some other embodiments of the present application, and FIG. 9 is a structural schematic diagram of a shell according to yet some other embodiments of the present application. According to some embodiments of the present application, the battery cell assembly 1 satisfies any one of the following conditions: (1) the shell 10 includes two end plates 13, two side plates 14, a top plate 15, and a bottom plate 16, as shown in FIG. 7, the two side plates 14 are oppositely arranged along a first direction X, the two end plates 13 are oppositely arranged along a second direction Y, the top plate 15 and the bottom plate 16 are oppositely arranged along a third direction, the two end plates 13, the two side plates 14, the top plate 15, and the bottom plate 16 collectively enclose a receiving cavity for receiving the plurality of battery cells 20, and the top plate 15 is the first wall 11, and the third direction is parallel to the thickness direction Z of the first wall; (2) the shell 10 includes two end plates 13, a top plate 15, and at least one binding member 17, as shown in FIG. 8, the two end plates 13 are oppositely arranged along the second direction Y, the binding member 17 and the two end plates 13 bind the plurality of battery cells 20, along the third direction, the top plate 15 is connected to one end of the two end plates 13, and the top plate 15 is the first wall 11; and (3) the shell 10 includes a semi-enclosed box 18 and a top plate 15 covering an open position of the semi-enclosed box 18, as shown in FIG. 9, and the top plate 15 is the first wall 11.

[0151] When the shell 10 includes two end plates 13, two side plates 14, a top plate 15, and a bottom plate 16, the shell 10 can be a closed shell or a non-closed shell. During assembly of the shell 10, the two ends of the end plate 13 in the second direction Y are respectively connected to the two side plates 14, and the two ends of the end plate 13 in the third direction are respectively connected to the top plate 15 and the bottom plate 16. The top plate 15 is located above the bottom plate 16 in the thickness direction Z of the first wall.

[0152] When the shell 10 includes two end plates 13, a top plate 15, and at least one binding member 17, along the second direction Y, the battery cells 20 are located between the two end plates 13, along the thickness direction Z of the first wall, the top plate 15 is located on top of the two end plates 13, and the top plate 15 is connected to the two end plates 13. The binding member 17 is annular, and the two end plates 13 and the battery cells 20 are sleeved by the binding member 17 to bind the plurality of battery cells 20 by cooperation of the binding member and the two end plates 13.

[0153] In the above-mentioned embodiments in which the shell 10 includes two end plates 13, when the material of the shell 22 is an aluminum plastic film, the tabs of the electrode assembly extend from opposite ends of the shell 22 in the second direction Y, and the tabs are electrically connected to the busbar components arranged on the end plates 13.

[0154] When the shell 10 comprises the semi-enclosed box 18 and the top plate 15 covering the open position of the semi-enclosed box 18, the top of the semi-enclosed box 18 is provided with an opening, the top plate 15 is located above the plurality of battery monomers 20 along the thickness direction Z of the first wall, the top plate 15 covers the open position of the semi-enclosed box 18, and the top plate 15 can be in sealed connection or non-sealed connection with the semi-enclosed box 18.

[0155] In the above scheme, when the shell 10 comprises the two end plates 13, the two side plates 14, the top plate 15, and the bottom plate 16, the two end plates 13, the two side plates 14, the top plate 15, and the bottom plate 16 jointly form a containing cavity to facilitate the assembly of the battery monomers 20 and the shell 10. When the shell 10 comprises the two end plates 13, the top plate 15, and at least one binding member 17, the plurality of battery monomers 20 are bound by the binding member 17 and the two end plates 13, which facilitates the constraint of the plurality of battery monomers 20 and reduces the risk of movement of the battery monomers 20, and the top plate 15 is connected to the top of the two end plates 13, so that the shell 10 can form a non-enclosed shell, which is convenient for processing and manufacturing. When the shell 10 comprises the semi-enclosed box 18 and the top plate 15 covering the open position of the semi-enclosed box 18, the structure is simple and convenient for assembly.

[0156] Please refer to FIG. 9, and further refer to FIG. 10 and FIG. 11, FIG. 10 is a structural schematic diagram of a pressure relief port provided by some embodiments of the present application, and FIG. 11 is a structural schematic diagram of a pressure relief port provided by another embodiments of the present application. According to some embodiments of the present application, the extension trajectory of the wall surface surrounding the pressure relief port 111 is a straight line and / or an arc.

[0157] The extension trajectory of the wall surface surrounding the pressure relief port 111 is a closed ring, which can be a straight line, or a combination of a straight line and an arc, or an arc. For example, the pressure relief port 111 can form at least one of a rectangle (as shown in FIG. 9), a circle, a long strip (a long runway shape, as shown in FIG. 10), a double Y shape (as shown in FIG. 11), or a straight line shape.

[0158] In the above scheme, the pressure relief port has various forms, and the shape of the pressure relief port can be at least one of a rectangle, a circle, a strip, a double Y shape, or a straight line shape, which is convenient for processing and manufacturing.

[0159] Please refer to FIG. 2 to FIG. 4, according to some embodiments of the present application, the battery monomer assembly 1 further comprises an insulating member 30, at least part of the insulating member 30 is arranged between the first wall 11 and the battery monomer 20. Wherein, the insulating member 30 is provided with a first weak area 31, and the projection of the first weak area 31 at least partially overlaps the pressure relief port 111 along the thickness direction Z of the first wall.

[0160] The insulation member 30 is arranged in the housing 10, for example, a part of the insulation member 30 can be arranged between the first wall 11 and the battery cell 20, or the whole of the insulation member 30 can be arranged between the first wall 11 and the battery cell 20.

[0161] The insulation member 30 is an electrically insulating component for insulating and isolating the first wall 11 and the battery cell 20, and the material of the insulation member 30 can be plastic, rubber, etc.

[0162] The first weak area 31 is a weak part of the insulation member 30, and the first weak area 31 is configured to be damaged by the discharge of the battery cell 20 when the battery cell 20 is in thermal runaway.

[0163] The first weak area 31 can adopt various arrangements that facilitate damage by the discharge.

[0164] For example, referring to FIG. 12, which is a structural schematic diagram of the first weak area provided by some embodiments of the present application, the insulation member 30 is provided with a groove corresponding to the pressure relief port 111, and the bottom wall of the groove forms the first weak area 31; wherein the opening of the groove can be arranged away from the battery cell 20, or the opening of the groove can also be arranged facing the battery cell 20. Since the bottom wall of the groove is weaker than other areas of the insulation member 30, it is easy to be damaged by the discharge, and when the battery cell 20 is in thermal runaway, the discharge of the battery cell 20 can damage the bottom wall of the groove and enter the pressure relief port 111.

[0165] For another example, referring to FIG. 13 and FIG. 14, FIG. 13 is a structural schematic diagram of the first weak area provided by some other embodiments of the present application, and FIG. 14 is a structural schematic diagram of the first weak area provided by some other embodiments of the present application. The insulation member 30 can be provided with a first notch 311 or a first gap 312, and the first notch 311 or the first gap 312 encloses the first weak area 31.

[0166] In the thickness direction Z of the first wall, the projection of the first weak area 31 can partially overlap the pressure relief port 111, or the projection of the first weak area 31 can fully overlap the pressure relief port 111. According to the correspondence between the first weak area 31 and the pressure relief port 111, the discharge can quickly enter the pressure relief port 111 after damaging the first weak area 31, so as to facilitate the rapid and directional discharge of the discharge out of the housing 10.

[0167] In the above scheme, the insulating piece 30 is used to insulate and isolate the battery monomer 20 and the first wall 11, and the insulating piece 30 has a relatively low strength; a first weak area 31 is arranged on the insulating piece 30, the first weak area 31 has a relatively low strength, and when the battery monomer 20 is in thermal runaway, the first weak area 31 is easily damaged by the discharge of the battery monomer 20 (such as high-temperature and high-pressure gas and the like), so that the discharge can quickly pass through the pressure relief port 111 and be discharged to the outside of the shell 10, facilitating rapid pressure relief, reducing the influence of the discharge on the adjacent battery monomer 20, reducing the risk of heat spread, and improving the reliability of the battery monomer assembly 1.

[0168] Please refer to FIG. 4, according to some embodiments of the present application, the insulating piece 30 includes a body part 32 and a protruding part 33 corresponding to the pressure relief port 111, the body part 32 has a first surface 321 facing away from the battery monomer 20, the protruding part 33 protrudes from the first surface 321, at least a part of the protruding part 33 is located in the pressure relief port 111, and the first weak area 31 is arranged on the protruding part 33.

[0169] In the above scheme, the protruding part 33 protrudes from the first surface 321, and at least a part of the protruding part 33 is located in the pressure relief port 111, which can reduce the space occupation of the protruding part 33 on one hand, and facilitate the discharge of the discharge to the outside of the shell 10 on the other hand.

[0170] Please refer to FIG. 4, according to some embodiments of the present application, the side of the insulating piece 30 away from the first wall 11 is formed with a recess 34, and the recess 34 corresponds in position to the protruding part 33.

[0171] For example, the insulating piece 30 includes a second surface 322 facing the battery monomer 20, the second surface 322 is arranged away from the first wall 11, and the recess 34 can be a groove formed on the second surface 322.

[0172] The recess 34 is formed on the side of the insulating piece 30 away from the first wall 11, and the recess 34 corresponds in position to the protruding part 33, so that the protruding part 33 has a hollow structure.

[0173] In the above scheme, the recess 34 is arranged, so that the insulating piece 30 can be integrally formed (such as injection molding), the insulating piece 30 has a relatively high overall strength, facilitating processing and manufacturing, and at the same time, the protruding part 33 can have a relatively thin wall thickness, facilitating the destruction of the first weak area 31 when the battery monomer 20 is in thermal runaway, so as to quickly release pressure.

[0174] Please refer to FIG. 4, and further refer to FIG. 15, which is a structural schematic diagram of the protrusion according to some embodiments of the present application. According to some embodiments of the present application, the protrusion 33 comprises a top wall 331 and a side wall 332, the side wall 332 is arranged around the periphery of the top wall 331, the side wall 332 connects the top wall 331 and the body part 32, the thickness of the top wall 331 is less than the thickness of the body part 32, and the top wall 331 forms the first weak area 31.

[0175] In some embodiments, the inner surface of the top wall 331 and the inner surface of the side wall 332 enclose the recess 34.

[0176] In some embodiments, the insulating piece 30 can be an integrally formed structure, and the insulating piece 30 can be an injection molded piece.

[0177] The thickness of the top wall 331 is less than the thickness of the body part 32, and the strength of the top wall 331 is less than the strength of the body part 32.

[0178] The top wall 331 is away from the battery monomer 20 relative to the body part 32, and the top wall 331 is located in the pressure relief port 111.

[0179] In the above scheme, the strength of the top wall 331 is low, the top wall 331 forms the first weak area 31, and when the battery monomer 20 is in thermal runaway, the first weak area 31 can be destroyed before the body part 32, so as to facilitate rapid pressure relief.

[0180] Please refer to FIG. 13 and FIG. 14. According to some embodiments of the present application, the first weak area 31 is provided with a first notch 311 or a first gap 312.

[0181] The first notch 311 can be processed by laser etching, cutter cutting and the like. The thickness of the insulating piece 30 at the first notch 311 can be thin, so that the strength at the first notch 311 is low. When the battery monomer 20 is in thermal runaway, the high-temperature and high-pressure discharge of the battery monomer 20 can first destroy the part of the insulating piece 30 at the first notch 311 to form a pressure relief opening.

[0182] The first gap 312 can be cut by a tool. The strength of the insulating piece 30 at the first gap 312 is less than the strength of the insulating piece 30 at other positions. When the high-temperature and high-pressure discharge is sprayed towards the first gap 312, the part near the first gap 312 is destroyed, so that a larger pressure relief opening is formed on the insulating piece 30, facilitating rapid discharge of the discharge.

[0183] In the above scheme, the first weak area 31 is provided with the first notch 311 or the first gap 312. When the battery monomer 20 is in thermal runaway, the discharge of the battery monomer 20 can quickly break through the first notch 311 or the first gap 312 to destroy the first weak area 31 and form a pressure relief channel, facilitating rapid pressure relief.

[0184] Referring to FIG. 3, according to some embodiments of the present application, the plurality of battery monomers 20 are arranged in a stack along a first direction X, which is perpendicular to the thickness direction Z of the first wall.

[0185] The plurality of battery monomers 20 are arranged in a stack along a first direction X, which can be parallel to the thickness direction of the battery monomers 20.

[0186] In some embodiments, the two adjacent battery monomers 20 can be in direct contact, or the two adjacent battery monomers 20 can be in indirect contact through other components such as glue, separators, etc.

[0187] In the above scheme, the plurality of battery monomers 20 are arranged in a stack along a first direction X, which can reasonably utilize the space inside the shell 10 in the first direction X, and facilitate to improve the energy density of the battery monomer assembly 1.

[0188] Referring to FIG. 2, according to some embodiments of the present application, the first wall 11 is provided with at least one column of pressure relief ports 111, and each column of pressure relief ports 111 includes a plurality of pressure relief ports 111 arranged at intervals along the first direction X.

[0189] In some embodiments, the first wall 11 can be provided with a plurality of columns of pressure relief ports 111 arranged at intervals along a second direction Y, so that the plurality of pressure relief ports 111 are arranged in a rectangular array on the first wall 11, and the second direction Y, the first direction X and the thickness direction Z of the first wall are perpendicular to each other.

[0190] In each column of pressure relief ports 111, the arrangement direction of the plurality of pressure relief ports 111 is parallel to the stacking direction of the plurality of battery monomers 20, one pressure relief port 111 can correspond to a plurality of battery monomers 20, or one pressure relief port 111 can also correspond to one battery monomer 20.

[0191] In the above scheme, each column of pressure relief ports 111 includes a plurality of pressure relief ports 111 arranged at intervals along the first direction X, and the plurality of pressure relief ports 111 can correspond to the plurality of battery monomers 20, so as to facilitate the rapid pressure relief in the first direction X when the battery monomer 20 is in thermal runaway.

[0192] According to some embodiments of the present application, the number of pressure relief ports 111 in each column of pressure relief ports 111 is M, the number of battery monomers 20 is a plurality, and the number of battery monomers 20 is N, which satisfies M≥0.5*N.

[0193] The number of pressure relief ports 111 will affect the overall strength of the insulating piece 30, the more the number of pressure relief ports 111, the lower the overall strength of the insulating piece 30, and the number of pressure relief ports 111 and the overall strength of the insulating piece 30 need to be considered.

[0194] In some embodiments, in each column of pressure relief ports 111, the number M of pressure relief ports 111 can be less than the number N of battery cells 20, and the insulating member 30 can have a higher overall strength.

[0195] In the above scheme, the number of battery cells 20 and the number of pressure relief ports 111 in each column of pressure relief ports 111 satisfy the above relationship. On the one hand, multiple battery cells 20 can share one pressure relief port 111, facilitating rapid pressure relief when the battery cells 20 are in thermal runaway. On the other hand, the insulating member 30 has a higher overall strength.

[0196] In some embodiments, along the thickness direction Z of the first wall, the projection of each battery cell 20 at least partially overlaps with one pressure relief port 111. When the battery cell 20 is in thermal runaway and discharges the discharge material, the discharge material can flow towards at least one pressure relief port 111. That is, the discharge material can damage at least one first weak area 31 to discharge the discharge material from the pressure relief port 111 corresponding to the first weak area 31.

[0197] For example, in each column of pressure relief ports 111, the size of a single pressure relief port 111 in the first direction X is L1, and the size of the battery cell 20 in the first direction X is L2, which satisfies L1>L2.

[0198] Please refer to FIG. 2. According to some embodiments of the present application, the first wall 11 is provided with at least one row of pressure relief ports 111, each row of pressure relief ports 111 including a plurality of pressure relief ports 111 arranged at intervals along the second direction Y, and the second direction Y, the first direction X and the thickness direction Z of the first wall are perpendicular to each other.

[0199] In some embodiments, the first wall 11 can be provided with a plurality of rows of pressure relief ports 111 arranged at intervals along the first direction X, so that the plurality of pressure relief ports 111 are arranged in a rectangular array on the first wall 11.

[0200] In each row of pressure relief ports 111, the arrangement direction of the plurality of pressure relief ports 111 can be parallel to the length direction of the battery cell 20.

[0201] In some embodiments, each pressure relief port 111 can extend along the second direction Y, and the length direction of the pressure relief port 111 can be parallel to the length direction of the battery cell 20.

[0202] In the above scheme, each row of pressure relief ports 111 includes a plurality of pressure relief ports 111 arranged at intervals along the second direction Y, so that when the battery cell 20 is in thermal runaway, the discharge material discharged by the battery cell 20 can be quickly discharged in the second direction Y.

[0203] Please refer to FIG. 2. According to some embodiments of the present application, the first weak area 31 and the pressure relief port 111 are both provided with a plurality of them, and the plurality of first weak areas 31 correspond one-to-one to the plurality of pressure relief ports 111.

[0204] In some embodiments, the number of the first weakened regions 31 can be the same as the number of the pressure relief ports 111.

[0205] In the above scheme, the plurality of first weakened regions 31 correspond to the plurality of pressure relief ports 111 one by one, and each first weakened region 31 corresponds to one pressure relief port 111, so that the emissions can be quickly discharged when the battery monomer 20 is in thermal runaway.

[0206] Please refer to FIGS. 16-18, FIG. 16 is a structural exploded view of a battery monomer assembly according to some embodiments of the present application, FIG. 17 is a cross-sectional view of the battery monomer assembly according to some embodiments of the present application, and FIG. 18 is an enlarged view of part B of FIG. 17. According to some embodiments of the present application, the battery monomer assembly 1 further comprises a heat insulation pad 40, which is arranged on the outer surface of the first wall 11. The heat insulation pad 40 is provided with a second weakened region 41. In the thickness direction Z of the first wall, the projection of the second weakened region 41 at least partially overlaps the pressure relief port 111.

[0207] The heat insulation pad 40 has good high-temperature resistance and can block high temperature.

[0208] The material of the heat insulation pad 40 can be, but is not limited to, mica, ceramic, aerogel, etc.

[0209] The heat insulation pad 40 can be bonded to the outer surface of the first wall 11.

[0210] The outer surface of the first wall 11 is the surface of the first wall 11 facing away from the battery monomer 20, and the inner surface of the first wall 11 is the surface of the first wall 11 surrounding the accommodating cavity. The outer surface of the first wall 11 and the inner surface of the first wall 11 are oppositely arranged in the thickness direction Z of the first wall.

[0211] The second weakened region 41 is a weak part of the heat insulation pad 40, and the second weakened region 41 is configured to be damaged by the emissions discharged by the pressure relief port 111.

[0212] For example, the heat insulation pad 40 is provided with a groove corresponding to the pressure relief port 111, and the bottom wall of the groove forms the second weakened region 41. The opening of the groove can face the first wall 11, or the opening of the groove can face away from the first wall 11. Since the bottom wall of the groove is weaker than other areas of the heat insulation pad 40, it is easy to be damaged by the emissions. When the battery monomer 20 is in thermal runaway, the emissions discharged from the pressure relief port 111 can damage the bottom wall of the groove of the heat insulation pad 40, thereby discharging to the outside.

[0213] For another example, the heat insulation pad 40 can be provided with a notch or a gap, and the notch or the gap surrounds the second weakened region 41.

[0214] Along the thickness direction Z of the first wall, the projection of the second weak area 41 can partially overlap with the pressure relief port 111, or the projection of the second weak area 41 can fully overlap with the pressure relief port 111. According to the correspondence between the second weak area 41 and the pressure relief port 111, the discharge can be quickly discharged to the outside of the battery cell assembly 1 after the second weak area 41 is broken.

[0215] In the above scheme, the setting of the thermal insulation pad 40 can reduce the influence of high-temperature gas from the outside of the shell 10 on the shell 10 and the battery cell 20, for example, can block the high-temperature gas discharged by the thermal runaway battery cell 20 from the pressure relief port 111 in the area that is not thermal runaway to enter the shell 10, thereby reducing the risk of heat spread. At the same time, the setting of the second weak area 41 can facilitate the discharge of high-temperature and high-pressure discharge to the outside of the battery cell assembly 1, thereby achieving one-way pressure relief.

[0216] Please refer to FIG. 18, according to some embodiments of the present application, the thermal insulation pad 40 is provided with a second notch or a second gap 42, and the second notch or the second gap 42 surrounds the second weak area 41.

[0217] The second notch can be processed by laser etching, cutter cutting, etc. The thickness of the thermal insulation pad 40 at the second notch can be thinner, so that the strength of the second notch is lower, and the discharge discharged from the pressure relief port 111 can first damage the part of the thermal insulation pad 40 at the second notch to form a pressure relief opening.

[0218] The second gap 42 can be cut by a tool. The strength of the thermal insulation pad 40 at the second gap 42 is less than the strength of the thermal insulation pad 40 at other positions. When high-temperature and high-pressure discharge is sprayed towards the second gap 42, the part near the second gap 42 is damaged, so that a larger pressure relief opening is formed on the thermal insulation pad 40, thereby facilitating the rapid discharge of the discharge.

[0219] In some embodiments, the second notch can be an open ring, or the second gap 42 can be an open ring.

[0220] In the above scheme, the setting of the second notch or the second gap 42 can facilitate the discharge from the pressure relief port 111 to quickly break through the thermal insulation pad 40, thereby facilitating rapid pressure relief.

[0221] Please refer to FIG. 16, according to some embodiments of the present application, the second weak area 41 and the pressure relief port 111 are each provided with a plurality of the second weak area 41 and the pressure relief port 111 one-to-one.

[0222] In some embodiments, the number of second weak areas 41 can be the same as the number of pressure relief ports 111.

[0223] In the above scheme, each second weak area 41 is arranged corresponding to a pressure relief port 111, which can facilitate the directional discharge of the discharge from the pressure relief port 111 to the outside.

[0224] According to some embodiments of the present application, the melting point of the thermal insulation pad 40 is greater than the melting point of the first wall 11.

[0225] In some embodiments, the thermal insulation pad 40 covers the non-pressure relief part of the first wall 11 (where no pressure relief port 111 is arranged), preventing the discharge of high temperature and high pressure generated by the thermal runaway of the battery cell 20 from being sprayed from the non-pressure relief part, so as to facilitate the directional pressure relief of the battery cell assembly 1.

[0226] The melting point of the thermal insulation pad 40 is greater than the melting point of the first wall 11, and under the action of high-temperature discharge, the first wall 11 melts before the thermal insulation pad 40, and the thermal insulation pad 40 can block the discharge of high-temperature and high-pressure discharge from the non-pressure relief part of the first wall 11.

[0227] For example, the material of the thermal insulation pad 40 can be, but is not limited to, mica, ceramic, aerogel, etc., and the material of the first wall 11 can be aluminum, aluminum alloy, etc.

[0228] In the above scheme, the melting point of the thermal insulation pad 40 is greater than the melting point of the first wall 11, and the thermal insulation pad 40 covers the non-pressure relief part of the shell 10, which can reduce the risk of the discharge of the battery cell 20 thermal runaway from being sprayed from the non-pressure relief part, so as to facilitate the directional pressure relief.

[0229] According to some embodiments of the present application, the battery cell 20 is a soft-pack battery cell.

[0230] The soft-pack battery cell has a simple structure and occupies less space, and more soft-pack battery cells can be arranged in the shell 10.

[0231] In the above scheme, the battery cell 20 is a soft-pack battery cell, which can reasonably utilize the space inside the shell 10, and the battery cell assembly 1 can have a higher energy density.

[0232] According to some embodiments of the present application, the material strength of the first wall 11 is greater than the material strength of the insulating part 30.

[0233] For example, the material of the first wall 11 can be aluminum, aluminum alloy, etc., and the material of the insulating part 30 can be plastic, rubber, etc.

[0234] The first wall 11 has a higher material strength, so as to protect the battery cell 20.

[0235] The insulating part 30 has a lower material strength, so that the discharge of the battery cell 20 can quickly break the first weak area 31, facilitating rapid pressure relief.

[0236] In the above scheme, the material strength of the first wall 11 is greater than the material strength of the insulating member 30, and the first weak area 31 is arranged on the insulating member 30 so that the discharge of the thermal runaway of the battery monomer 20 can quickly break through the insulating member 30 to achieve rapid and directional pressure relief, thereby improving the reliability of the battery monomer assembly 1.

[0237] Please refer to FIG. 2 and FIG. 16, according to some embodiments of the present application, the shell 10 includes an outer frame 12 and an end plate 13, the battery monomer 20 is arranged in the outer frame 12, the outer frame 12 has an opening, and the end plate 13 closes the opening, and the first wall 11 is a wall body of the outer frame 12.

[0238] The outer frame 12 forms a containing cavity with an opening, and the end plate 13 closes the opening of the outer frame 12 to form a containing cavity containing the battery monomer 20.

[0239] The outer frame 12 has high material strength and can protect the battery monomer 20 from external damage.

[0240] The material of the end plate 13 can be the same as or different from that of the outer frame 12.

[0241] The battery monomer assembly 1 can further include an electrode lead-out portion (not shown in the figure), which can be arranged on the end plate 13. The electrode lead-out portion is electrically connected to the battery monomer 20 internally and is electrically connected to an external conductor externally, so as to lead out the electric energy of the battery monomer 20.

[0242] For example, the outer frame 12 can include a plurality of side walls 332, the plurality of side walls 332 are sequentially connected end to end, the plurality of side walls 332 enclose a containing cavity with an opening, and the end plate 13 is connected with the plurality of side walls 332 to close the opening. The first wall 11 can be at least one of the plurality of side walls 332.

[0243] Optionally, the number of the first wall 11 is two, the two first walls 11 are oppositely arranged in a third direction, and the battery monomer 20 is arranged between the two first walls 11. The third direction, the second direction Y and the first direction X are perpendicular to each other, and the third direction is parallel to the thickness direction Z of the first wall.

[0244] In some embodiments, the outer frame 12 can be a cuboid, the outer frame 12 has two openings oppositely arranged along the second direction Y, and the number of the end plate 13 is two, and the two end plates 13 respectively close the two openings.

[0245] In some embodiments, the battery monomer 20 includes an electrode assembly (not shown in the figure), the electrode assembly has a first tab and a second tab, the polarities of the first tab and the second tab are opposite, and the first tab and the second tab are respectively located at opposite ends of the electrode assembly in the second direction Y.

[0246] In the above scheme, the outer frame 12 and the end plate 13 cooperate to form a protective structure to reduce the risk of the battery monomer 20 being damaged by external components; the first wall 11 is a wall body of the outer frame 12 to facilitate the discharge of the discharge.

[0247] In some embodiments, the battery monomer 20 can be flat, the thickness direction of the battery monomer 20 is parallel to the first direction X, and the length direction of the battery monomer 20 is parallel to the second direction Y.

[0248] According to some embodiments of the present application, the embodiments of the present application also provide a battery device 100, which comprises the battery monomer assembly 1 provided according to any of the above embodiments.

[0249] According to some embodiments of the present application, the battery device 100 further comprises a box body and an upper cover, the upper cover is buckled with the box body, and the first wall 11 of all the battery monomer assemblies 1 is integrally formed and constitutes the upper cover.

[0250] In the above scheme, the first wall 11 of all the battery monomer assemblies 1 is integrally formed, and the plurality of battery monomer assemblies 1 share an upper cover, which facilitates processing and manufacturing.

[0251] According to some embodiments of the present application, the embodiments of the present application also provide a power-using equipment, which comprises the battery monomer assembly 1 or the battery device 100 provided according to any of the above embodiments, and the battery monomer assembly 1 or the battery device 100 is used to provide electric energy.

[0252] According to some embodiments of the present application, please refer to FIGS. 2-18, the embodiments of the present application provide a battery monomer assembly 1, which comprises a shell 10, a battery monomer 20, an insulating piece 30 and a heat insulation pad 40.

[0253] The shell 10 comprises an outer frame 12 and two end plates 13, the outer frame 12 is a cuboid, the outer frame 12 has two openings, and the two openings are oppositely arranged along the second direction Y; the two end plates 13 respectively close the two openings. The material of the outer frame 12 is aluminum or aluminum alloy.

[0254] The outer frame 12 comprises a first wall 11, the first wall 11 is provided with a plurality of pressure relief openings 111, and the plurality of pressure relief openings 111 are arranged in a rectangular array.

[0255] The battery monomer 20 is arranged in the outer frame 12, the battery monomer 20 is a soft pack battery monomer, a plurality of battery monomers 20 are arranged along the first direction X, and the length direction of the battery monomer 20 is parallel to the second direction Y.

[0256] The insulation piece 30 is arranged in the outer frame 12, and at least part of the insulation piece 30 is arranged between the first wall 11 and the battery monomer 20. The insulation piece 30 comprises a body part 32 and a protruding part 33 corresponding to the pressure relief port 111, the body part 32 has a first surface 321 facing away from the battery monomer 20, the protruding part 33 protrudes from the first surface 321, and at least part of the protruding part 33 is located in the pressure relief port 111. The side of the insulation piece 30 facing away from the first wall 11 is formed with a recess 34 corresponding in position to the protruding part 33. The protruding part 33 comprises a top wall 331 and a side wall 332, the side wall 332 connects the top wall 331 and the body part 32, the top wall 331 is located in the pressure relief port 111, and the top wall 331 forms a first weak area 31. The first weak area 31 comprises a first notch 311 or a first gap 312. The number of the first weak area 31 and the pressure relief port 111 is plural, and each first weak area 31 is arranged corresponding to one pressure relief port 111.

[0257] The heat insulation pad 40 is arranged on the outer surface of the first wall 11, and the heat insulation pad 40 is provided with a second weak area 41, and the projection of the second weak area 41 at least partially overlaps the pressure relief port 111 along the thickness direction Z of the first wall. The number of the second weak area 41 is plural, and each second weak area 41 is arranged corresponding to one pressure relief port 111. The heat insulation pad 40 is provided with a second notch or a second gap 42, and the second notch or the second gap 42 encloses the second weak area 41. The melting point of the heat insulation pad 40 is greater than the melting point of the first wall 11.

[0258] According to the battery monomer assembly 1 of the embodiments of the present application, the arrangement of the second weak area 41, the pressure relief port 111 and the first weak area 31 can facilitate the rapid and directional discharge of the discharge of the thermal runaway of the battery monomer 20, so as to facilitate the rapid pressure relief of the battery monomer assembly 1. The arrangement of the heat insulation pad 40 can block the discharge from being sprayed out of the non-pressure relief part of the shell 10, so as to facilitate the directional pressure relief of the battery monomer assembly 1.

[0259] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell assembly, comprising: a housing comprising a first wall, the first wall being provided with a pressure relief port; a plurality of battery cells arranged side by side in the housing and electrically connected; wherein each of the battery cells has a pressure relief zone, the pressure relief zone of each of the battery cells being arranged at least partially opposite to the first wall, so that the discharge of the pressure relief zone can be discharged out of the housing through the pressure relief port.

2. The battery cell assembly of claim 1, wherein, the battery cell comprises a shell and an electrode assembly arranged in the shell, the shell is made of any one of aluminum plastic film, aluminum alloy or steel; when the shell is made of aluminum plastic film, the aluminum plastic film heat-seals the edge of the electrode assembly to form the pressure relief zone; when the shell is made of aluminum alloy or steel, a weak part on the shell forms the pressure relief zone.

3. The battery cell assembly of claim 2, wherein, the shell is made of aluminum plastic film, the aluminum plastic film forms the pressure relief zone on three edges of the electrode assembly in the circumferential direction, and two of the three edges are used for the tab of the electrode assembly to protrude, and the remaining one of the three edges forms the pressure relief zone opposite to the first wall.

4. The battery cell assembly of claim 2, wherein, the shell is made of aluminum alloy or steel, the weak part on the shell is a thickness reduction area or an area provided with a notch.

5. The battery cell assembly of any one of claims 1 to 4, wherein, the housing is a closed housing or a non-closed housing; and / or, the material strength of the housing is higher than that of the aluminum plastic film.

6. The battery cell assembly of any one of claims 1 to 5, wherein, the first wall is the highest wall among all wall positions of the housing.

7. The battery cell assembly of any one of claims 1 to 6, wherein, the battery cell assembly satisfies any one of the following conditions: (1) the housing comprises two end plates, two side plates, a top plate and a bottom plate, the two side plates are arranged opposite to each other along a first direction, the two end plates are arranged opposite to each other along a second direction, the top plate and the bottom plate are arranged opposite to each other along a third direction, the two end plates, the two side plates, the top plate and the bottom plate jointly form a receiving cavity for receiving the plurality of battery cells, the first direction, the second direction and the third direction are perpendicular to each other, the top plate is the first wall, and the third direction is parallel to the thickness direction of the first wall; (2) the housing comprises two end plates, a top plate and at least one binding member, the two end plates are arranged opposite to each other along the second direction, the binding member and the two end plates bind the plurality of battery cells, and the top plate is arranged at one end of the two end plates along the third direction, the top plate is the first wall; (3) the housing comprises a semi-closed box body and a top plate arranged on the opening position of the semi-closed box body, and the top plate is the first wall.

8. The battery cell assembly of any one of claims 1 to 7, wherein, the extension trajectory of the wall surface surrounding the pressure relief port is a straight line and / or an arc line.

9. The battery cell assembly of any one of claims 1 to 8, wherein, the battery cell assembly further comprises an insulating member, at least part of the insulating member is arranged between the first wall and the battery cell; wherein the insulating member is provided with a first weak zone, and the projection of the first weak zone at least partially overlaps with the pressure relief port along the thickness direction of the first wall.

10. The battery cell assembly of claim 9, wherein, The insulation member includes a body portion having a first surface facing away from the battery cell and a protruding portion protruding from the first surface, at least a portion of the protruding portion being located in the pressure relief port, and the first weak area is provided in the protruding portion.

11. The battery cell assembly of claim 10, wherein, A recess is formed on a side of the insulation member facing away from the first wall, and the recess corresponds in position to the protruding portion.

12. The battery cell assembly of claim 11, wherein, The protruding portion includes a top wall and a side wall, the side wall being provided around a periphery of the top wall, the side wall connecting the top wall and the body portion, the top wall having a thickness smaller than a thickness of the body portion, and the top wall forming the first weak area.

13. The battery cell assembly of any one of claims 9-12, wherein, The first weak area is provided with a first notch or a first slit.

14. The battery cell assembly of any one of claims 9-13, wherein, A plurality of the battery cells are stacked along a first direction, the first direction being perpendicular to a thickness direction of the first wall.

15. The battery cell assembly of claim 14, wherein, The first wall is provided with at least one column of the pressure relief ports, each column of the pressure relief ports including a plurality of the pressure relief ports spaced along the first direction.

16. The battery cell assembly of claim 15, wherein, The number of the pressure relief ports in each column of the pressure relief ports is M, the number of the battery cells is a plurality, and the number of the battery cells is N, satisfying M≥0.5*N.

17. The battery cell assembly of claim 14, wherein, The first wall is provided with at least one row of the pressure relief ports, each row of the pressure relief ports including a plurality of the pressure relief ports spaced along a second direction, the second direction, the first direction, and the thickness direction of the first wall being perpendicular to each other.

18. The battery cell assembly of any one of claims 9-17, wherein, The first weak area and the pressure relief port are each provided with a plurality, and the plurality of the first weak areas correspond one-to-one to the plurality of the pressure relief ports.

19. The battery cell assembly of any one of claims 9-18, wherein, The battery cell assembly further includes: A thermal insulation pad is provided on an outer surface of the first wall, the thermal insulation pad being provided with a second weak area, and a projection of the second weak area at least partially overlaps the pressure relief port along the thickness direction of the first wall.

20. The battery cell assembly of claim 19, wherein, The thermal insulation pad is provided with a second notch or a second slit, and the second notch or the second slit encloses the second weak area.

21. The battery cell assembly of claim 19 or 20, wherein, The second weak area and the pressure relief port are each provided with a plurality, and the plurality of the second weak areas correspond one-to-one to the plurality of the pressure relief ports.

22. The battery cell assembly of any one of claims 19-21, wherein, The melting point of the thermal insulation pad is greater than the melting point of the first wall.

23. The battery cell assembly of any one of claims 9-22, wherein, The battery cell is a soft-pack battery cell.

24. The battery cell assembly of any one of claims 9-23, wherein, The material strength of the first wall is greater than the material strength of the insulation member.

25. The battery cell assembly of any one of claims 9-24, wherein, The housing includes an outer frame and an end plate, the battery cell is provided in the outer frame, the outer frame has an opening, the end plate closes the opening, and the first wall is a wall body of the outer frame. 26.A battery device including at least one battery cell assembly according to any one of claims 1 to 25.

27. The battery device of claim 26, wherein, The battery device further includes a box body and an upper cover, the upper cover is fastened to the box body, the first walls of all the battery cell assemblies are integrally formed and constitute the upper cover. 28.A consumer electronic device including a battery cell assembly according to any one of claims 1 to 25 or a battery device according to claim 26 or 27, the battery cell assembly or the battery device being used to provide electric energy.

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