Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell and a reinforcing part, the shell comprises a wall part, the wall part is provided with a weak part, the weak part is annular, and the weak part is configured to be at least partially damaged when the battery monomer is subjected to pressure relief. The wall portion has a first surface in a thickness direction of the wall portion. The reinforcing part is arranged on the first surface and is of an annular structure, and the weak part is arranged on the outer side of the reinforcing part in a surrounding mode. The weak part is annular, the reinforcing part is of an annular structure, the weak part is arranged on the outer side of the reinforcing part in a surrounding mode, and the reinforcing effect of the reinforcing part on all positions of the weak part is close, so that the weak part is more easily and completely damaged when the single battery is subjected to pressure relief, a large opening is opened, and rapid pressure relief of the single battery is facilitated. When the area, located on the inner side of the reinforcing part, of the wall part is stressed and deformed, the reinforcing part can play a buffering role, reduce stress conducted to the weak part and reduce the risk of opening a valve in advance of the battery monomer, and the service life and the reliability of the battery monomer are favorably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, a battery device and a power consumption device. BACKGROUND

[0002] Batteries are widely used in the field of new energy, for example, electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automobile industry. The development of battery technology needs to consider various design factors, such as energy density, discharge capacity, charge-discharge rate and other performance parameters. In addition, the service life of the battery also needs to be considered. However, the service life of the current battery is relatively short. CONTENT OF THE INVENTION

[0003] The purpose of the embodiments of the present application is to provide a battery monomer, a battery device and a power consumption device, which aims to improve the problem of short service life of the battery in the related art.

[0004] In a first aspect, the embodiments of the present application provide a battery monomer, which comprises a shell and a reinforcing part, the shell comprises a wall part, the wall part has a weak part, the weak part is annular, the weak part is configured to be at least partially destroyed when the battery monomer is pressure released, the wall part has a first surface in the thickness direction of the wall part; the reinforcing part is arranged on the first surface, the reinforcing part is an annular structure, and the weak part is arranged on the outer side of the reinforcing part.

[0005] In the above technical solution, the first surface of the wall part in the thickness direction is provided with the reinforcing part, the reinforcing part strengthens the wall part, improves the anti-deformation ability of the wall part, improves the fatigue resistance of the wall part, reduces the risk of the wall part being damaged due to fatigue, makes the wall part have a longer service life, and further improves the service life of the battery monomer. In addition, the weak part is annular, the reinforcing part is an annular structure, and the weak part is arranged on the outer side of the reinforcing part. On the one hand, the reinforcing part has a similar strengthening effect on each position of the weak part, so that the weak part is more easily completely destroyed when the battery monomer is pressure released, so that the area of the wall part located on the inner side of the weak part is easily completely separated from the wall part, a larger opening is opened, and the discharge of the battery monomer can quickly release pressure through the opening, which is beneficial to improving the timeliness of the pressure release of the battery monomer. On the other hand, when the area of the wall part located on the inner side of the reinforcing part is deformed under stress, the reinforcing part can play a buffering role, reducing the stress conducted to the weak part, thereby reducing the risk of the battery monomer opening the valve in advance, and improving the service life and reliability of the battery monomer.

[0006] As an optional technical solution of the embodiments of the present application, in the direction perpendicular to the thickness direction of the wall part, the distance between the weak part and the reinforcing part is L, which satisfies: 1mm≤L≤4mm.

[0007] In the technical solution, when L≥1mm, the distance between the weakened portion and the reinforcing portion in the direction perpendicular to the thickness direction of the wall portion is large, so that the reinforcing portion does not easily affect the weakened portion when arranged, which is beneficial to reduce the risk of early valve opening of the battery monomer and improve the service life and reliability of the battery monomer. When L≤4mm, the distance between the weakened portion and the reinforcing portion in the direction perpendicular to the thickness direction of the wall portion is not too large, so that the area of the wall portion inside the reinforcing portion is large, thereby enabling the reinforcing portion to play a better buffering role, reducing the risk of early valve opening of the battery monomer, and being beneficial to improve the service life and reliability of the battery monomer. Therefore, when 1mm≤L≤4mm, the battery monomer has a longer service life and higher reliability.

[0008] As an optional technical solution of the embodiment of the application, 2mm≤L≤3mm.

[0009] In the technical solution, when L≥2mm, the distance between the weakened portion and the reinforcing portion in the direction perpendicular to the thickness direction of the wall portion is larger, so that the reinforcing portion does not easily affect the weakened portion when arranged, which is more beneficial to reduce the risk of early valve opening of the battery monomer and improve the service life and reliability of the battery monomer. When L≤3mm, the distance between the weakened portion and the reinforcing portion in the direction perpendicular to the thickness direction of the wall portion is not too large, so that the area of the wall portion inside the reinforcing portion is larger, thereby enabling the reinforcing portion to play a better buffering role, reducing the risk of early valve opening of the battery monomer, and being beneficial to improve the service life and reliability of the battery monomer. Therefore, when 2mm≤L≤3mm, the battery monomer has a longer service life and higher reliability.

[0010] As an optional technical solution of the embodiment of the application, the distance between the weakened portion and the reinforcing portion in the direction perpendicular to the thickness direction of the wall portion is less than the distance from the reinforcing portion to the central axis of the weakened portion.

[0011] In the technical solution, the distance between the weakened portion and the reinforcing portion in the direction perpendicular to the thickness direction of the wall portion is less than the distance from the reinforcing portion to the central axis of the weakened portion, so that the area of the wall portion inside the reinforcing portion is large, thereby enabling the reinforcing portion to play a better buffering role, reducing the risk of early valve opening of the battery monomer, and being beneficial to improve the service life and reliability of the battery monomer.

[0012] As an optional technical solution of the embodiment of the application, the weakened portion and the reinforcing portion are both circular rings, and the distance between the axis of the weakened portion and the axis of the reinforcing portion is less than or equal to 1mm.

[0013] In the technical solution, the weak part and the reinforcing part are both circular rings, and the distance between the axis of the weak part and the axis of the reinforcing part is less than or equal to 1 mm. In this way, the weak part and the reinforcing part are coaxially arranged, the reinforcing part has a more uniform reinforcing effect on each position of the weak part, the stress on each position of the weak part is more uniform when the battery cell is depressurized, the weak part is more easily completely destroyed when the battery cell is depressurized, the area of the wall part inside the weak part is more easily completely separated from the wall part, a larger opening is opened, the discharge in the battery cell can be quickly depressurized through the opening, and the timeliness of the battery cell depressurization is improved.

[0014] As an optional technical solution of the embodiment, the axis of the weak part and the axis of the reinforcing part coincide.

[0015] In the technical solution, the weak part and the reinforcing part are both circular rings, and the axis of the weak part and the axis of the reinforcing part coincide. In this way, the weak part and the reinforcing part are coaxially arranged, the reinforcing part has the most uniform reinforcing effect on each position of the weak part, the stress on each position of the weak part is more uniform when the battery cell is depressurized, the weak part is more easily completely destroyed when the battery cell is depressurized, the area of the wall part inside the weak part is more easily completely separated from the wall part, a larger opening is opened, the discharge in the battery cell can be quickly depressurized through the opening, and the timeliness of the battery cell depressurization is improved.

[0016] As an optional technical solution of the embodiment, the wall part has a second surface opposite to the first surface, the wall part is provided with a first groove, the first groove is annular, the first groove is recessed from the second surface in a direction close to the first surface, and the reinforcing part protruding from the first surface is formed at a position of the wall part corresponding to the first groove.

[0017] In the technical solution, the first groove can be formed on the second surface by stamping during molding, and then the reinforcing part protruding from the first surface is formed. The reinforcing part is formed in a simple manner. The first groove is arranged to form a recessed structure at the position of the wall part where the reinforcing part is arranged, so that the reinforcing part has better deformation resistance and improves the reinforcing effect of the reinforcing part on the wall part.

[0018] As an optional technical solution of the embodiment, along the thickness direction of the wall part, the reinforcing part has a third surface farthest from the first surface, the distance between the groove bottom surface of the first groove and the third surface is H1, the distance between the first surface and the second surface is H2, and 0.5≤H1 / H2≤1.5 is satisfied.

[0019] In the technical solution, when H1 / H2 is greater than or equal to 0.5, the distance between the groove bottom surface of the first groove and the third surface is relatively large along the thickness direction of the wall portion, the reinforcing portion has good reinforcing effect and buffering effect. When H1 / H2 is less than or equal to 1.5, the distance between the groove bottom surface of the first groove and the third surface is not too large along the thickness direction of the wall portion, which is beneficial to reduce the occupation of the reinforcing portion to the internal space of the battery monomer or the internal space of the battery device, and is beneficial to improve the energy density of the battery monomer or the battery device. When 0.5≤H1 / H2≤1.5, the distance between the groove bottom surface of the first groove and the third surface is relatively close to the distance between the first surface and the second surface along the thickness direction of the wall portion, which is beneficial to process the reinforcing portion by stamping, and the reinforcing effect, the buffering effect of the reinforcing portion and the energy density of the battery monomer can be considered.

[0020] As an optional technical solution of the embodiment, 0.8≤H1 / H2≤1.2.

[0021] In the technical solution, when H1 / H2 is greater than or equal to 0.8, the distance between the groove bottom surface of the first groove and the third surface is larger along the thickness direction of the wall portion, the reinforcing portion has better reinforcing effect and buffering effect. When H1 / H2 is less than or equal to 1.2, the distance between the groove bottom surface of the first groove and the third surface is not too large along the thickness direction of the wall portion, which is beneficial to reduce the occupation of the reinforcing portion to the internal space of the battery monomer or the internal space of the battery device, and is beneficial to improve the energy density of the battery monomer or the battery device. When 0.8≤H1 / H2≤1.2, the distance between the groove bottom surface of the first groove and the third surface is more close to the distance between the first surface and the second surface along the thickness direction of the wall portion, which is beneficial to process the reinforcing portion by stamping, and the reinforcing effect, the buffering effect of the reinforcing portion and the energy density of the battery monomer can be considered.

[0022] As an optional technical solution of the embodiment, the height of the reinforcing portion protruding from the first surface along the thickness direction of the wall portion is H3, the distance between the first surface and the second surface is H2, and 1 / 3≤H3 / H2≤1 is satisfied.

[0023] In the technical solution, when H3 / H2 is greater than or equal to 1 / 3, the height of the reinforcing portion protruding from the first surface is relatively high along the thickness direction of the wall portion, the reinforcing portion has good reinforcing effect and buffering effect. When H3 / H2 is less than or equal to 1, the height of the reinforcing portion protruding from the first surface is not too high along the thickness direction of the wall portion, on the one hand, it is not easy to cause the material to be excessively stretched to form a weak position when the reinforcing portion is processed by stamping. On the other hand, it is beneficial to reduce the occupation of the reinforcing portion to the internal space of the battery monomer or the internal space of the battery device, and is beneficial to improve the energy density of the battery monomer or the battery device. When 1 / 3≤H3 / H2≤1, the reinforcing effect, the buffering effect of the reinforcing portion and the energy density of the battery monomer can be considered.

[0024] As an optional technical solution of the embodiment of the application, the wall portion is provided with a second groove, and a groove bottom wall of the second groove forms the weak portion; along the thickness direction of the wall portion, the groove bottom surface of the first groove is closer to the first surface than the groove bottom surface of the second groove.

[0025] In the above technical solution, by making the groove bottom surface of the first groove closer to the first surface than the groove bottom surface of the second groove along the thickness direction of the wall portion, when the region of the wall portion inside the reinforcing portion is deformed under stress, the reinforcing portion can play a better buffering role, reducing the stress conducted to the weak portion, thereby reducing the risk of the battery monomer opening the valve in advance, and being beneficial to improving the life and reliability of the battery monomer.

[0026] As an optional technical solution of the embodiment of the application, the reinforcing portion has a first side wall and a first bottom wall, the first side wall surrounds the first bottom wall, and the first side wall and the first bottom wall jointly define the first groove; the thickness of the first side wall is H4, the distance between the first surface and the second surface along the thickness direction of the wall portion is H2, and H4≤H2 is satisfied.

[0027] In the above technical solution, when H4≤H2, the thickness of the first side wall does not exceed the distance between the first surface and the second surface, the molding process can be simplified, and the reinforcing portion can be molded by stamping, and the molding method is simple.

[0028] As an optional technical solution of the embodiment of the application, along the thickness direction of the wall portion, the thickness of the first bottom wall is H1, the distance between the first surface and the second surface is H2, and H1≤H2 is satisfied.

[0029] In the above technical solution, when H1≤H2, the thickness of the first bottom wall does not exceed the distance between the first surface and the second surface, the molding process can be simplified, and the reinforcing portion can be molded by stamping, and the molding method is simple.

[0030] As an optional technical solution of the embodiment of the application, the wall portion is provided with a second groove, and a groove bottom wall of the second groove forms the weak portion.

[0031] In the above technical solution, the weak portion is formed on the wall portion by means of the second groove on the wall portion, and when the battery monomer is pressure released, the wall portion is cracked along at least part of the second groove, which is simple and convenient, and has low cost.

[0032] As an optional technical solution of the embodiment of the application, the second groove is arranged on the first surface.

[0033] In the technical solution, the reinforcing portion protrudes from the first surface, and the second groove is arranged on the first surface, that is, the reinforcing portion and the second groove are arranged on the same surface. When the reinforcing portion and the second groove are processed by stamping, the wall portion is stamped from both sides of the wall portion, so that the wall portion is not easily deformed toward one side.

[0034] As an optional technical solution of the embodiment, the first surface faces the inside of the shell.

[0035] In the technical solution, the reinforcing portion is arranged on the first surface, and the first surface faces the inside of the shell. The reinforcing portion can utilize the internal space of the battery monomer, and the reinforcing portion does not occupy the space outside the battery monomer. In the embodiment in which the second groove is arranged on the first surface, the first surface faces the inside of the shell, so that the second groove faces the inside of the battery monomer, and the second groove is not exposed to the outside of the battery monomer, thereby reducing the risk that the position of the wall portion in which the second groove is arranged is oxidized due to exposure to the outside of the battery monomer.

[0036] As an optional technical solution of the embodiment, the battery monomer includes an electrode assembly accommodated in the shell, and the wall portion includes a wall body and an abutting portion. The abutting portion is arranged around the outer edge of the wall body and protrudes from the wall body in a direction close to the electrode assembly along the thickness direction of the wall portion, and directly or indirectly abuts against the electrode assembly. The wall body includes the weak portion.

[0037] In the technical solution, the abutting portion of the wall portion directly or indirectly abuts against the electrode assembly. The abutting portion can limit the electrode assembly, thereby reducing the risk that the electrode assembly moves in the shell.

[0038] As an optional technical solution of the embodiment, the shell includes a second side wall surrounding the wall portion, and the wall portion is located at one end of the second side wall along the thickness direction of the wall portion. A first flow channel is formed between the electrode assembly and the second side wall. The abutting portion and the wall body jointly define a flow space, and the abutting portion is provided with a second flow channel. The second flow channel communicates the flow space and the first flow channel.

[0039] In the technical solution, the abutting portion is provided with the second flow channel, the second flow channel communicates the flow channel space and the first flow channel, when the battery monomer is in thermal runaway, the exhaust generated by the electrode assembly flows into the first flow channel, and then the exhaust can flow to the flow channel space through the second flow channel on the abutting portion, so that the air pressure in the flow channel space is rapidly increased to rapidly reach the burst pressure, so that the weak portion can be timely damaged, the time from the thermal runaway of the battery monomer to the pressure relief of the battery monomer is shortened, the risk of explosion and fire of the battery monomer is reduced, and the reliability of the battery monomer is effectively improved.

[0040] As an optional technical solution of the embodiment of the application, the wall portion further comprises an edge portion, the edge portion is arranged around the outer edge of the abutting portion, and the edge portion abuts against one end of the second side wall in the direction of the wall portion pointing to the electrode assembly.

[0041] In the technical solution, the abutting of the edge portion and the second side wall can achieve the limiting of the wall portion, and limit the movement of the wall portion in the direction close to the electrode assembly.

[0042] As an optional technical solution of the embodiment of the application, in the thickness direction of the wall portion, the wall body has a fourth surface and a fifth surface arranged oppositely, the fourth surface faces the electrode assembly, the wall body is provided with a recess, the recess is recessed from the fifth surface in the direction close to the fourth surface, and a convex portion protruding from the fourth surface is formed at the position of the wall body corresponding to the recess, and the surface of the convex portion facing the electrode assembly is the first surface; in the thickness direction of the wall portion, the orthographic projection of the weak portion is located in the recess.

[0043] In the technical solution, the recess is arranged to make the area of the wall portion inside the weak portion and the fifth surface have a certain distance, when the fifth surface contacts the external component, the influence of the external component on the area of the wall portion inside the weak portion is reduced, so that the area of the wall portion inside the weak portion can be opened outward when the battery monomer is pressure relieved, and the risk that the area of the wall portion inside the weak portion cannot be normally opened due to the blocking effect of the external component is reduced.

[0044] As an optional technical solution of the embodiment of the application, the shell comprises a shell body and an end cover, the shell body has an opening, and the end cover closes the opening, and the end cover is the wall portion.

[0045] In the technical solution, the end cover is the wall portion, so that the end cover is provided with the weak portion, and the forming difficulty or installation difficulty of the weak portion is reduced.

[0046] As an optional technical solution of the embodiment of the present application, the battery monomer is a cylindrical battery monomer, and the thickness direction of the wall portion is parallel to the axial direction of the cylindrical battery monomer.

[0047] In a second aspect, the embodiment of the present application further provides a battery device, which comprises the battery monomer described above.

[0048] As an optional technical solution of the embodiment of the present application, along the thickness direction of the wall portion, the wall portion has a fourth surface and a fifth surface arranged oppositely, the fourth surface faces the interior of the shell, the wall portion is provided with a recess, the recess is recessed from the fifth surface in a direction close to the fourth surface, and a convex portion convex to the fourth surface is formed at a position of the wall portion corresponding to the recess, a surface of the convex portion facing the interior of the shell is the first surface, and along the thickness direction of the wall portion, the orthographic projection of the weak portion is located in the recess; the battery device further comprises a box body, the battery monomer is accommodated in the box body, and the battery monomer is fixed to the box body through a glue layer, and the glue layer is at least partially accommodated in the recess.

[0049] In the above technical solution, by at least partially accommodating the glue layer in the recess, on the one hand, the space occupation of the glue layer in the interior of the box body can be reduced, and the energy density of the battery device can be improved. On the other hand, at least partially accommodating the glue layer in the recess can increase the contact area between the glue layer and the wall portion, and the bonding strength between the battery monomer and the box body can be improved.

[0050] As an optional technical solution of the embodiment of the present application, the wall portion is provided with a first groove, the first groove is annular, the first groove is recessed from the bottom surface of the recess in a direction close to the first surface, and the reinforcing portion convex to the first surface is formed at a position of the wall portion corresponding to the first groove.

[0051] In the above technical solution, during forming, the first groove can be formed on the bottom surface of the recess by stamping, and then the reinforcing portion convex to the first surface is formed. The forming mode of the reinforcing portion is simple. The first groove is arranged to form a recessed structure at the position of the wall portion where the reinforcing portion is arranged, so that the reinforcing portion has better anti-deformation capability, and the reinforcing effect of the reinforcing portion on the wall portion is improved.

[0052] As an optional technical solution of the embodiment of the present application, a part of the glue layer is accommodated in the first groove.

[0053] In the technical solution, the part of the adhesive layer is accommodated in the first groove, which can reduce the space occupied by the adhesive layer in the battery box and improve the energy density of the battery device. In addition, the adhesive layer is at least partially accommodated in the first groove, which can increase the contact area between the adhesive layer and the wall part and improve the bonding strength between the battery cell and the battery box.

[0054] As an optional technical solution of the embodiment, the first groove does not accommodate the adhesive layer.

[0055] In the technical solution, the first groove does not accommodate the adhesive layer, which can prevent the adhesive layer from preventing the weak part from cracking, so that the battery cell can be smoothly discharged, and the timeliness of the battery cell discharge can be improved. In a third aspect, the embodiment also provides a power utilization device, which comprises the battery cell described above and is configured to provide power for the power utilization device. BRIEF DESCRIPTION OF DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0057] Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application.

[0058] Figure 2 An exploded view of a battery device is provided for some embodiments of the present application.

[0059] Figure 3 An exploded view of a battery cell is provided for some embodiments of the present application.

[0060] Figure 4 A structural schematic diagram of a wall part is provided for some embodiments of the present application.

[0061] Figure 5 A top view of a wall part is provided for some embodiments of the present application.

[0062] Figure 6 A sectional view of the A-A position in the above-mentioned technical solution is provided for some embodiments of the present application. Figure 5 A sectional view of the B-B position in the above-mentioned technical solution is provided for some embodiments of the present application.

[0063] Figure 7 An enlarged view of the B position in the above-mentioned technical solution is provided for some embodiments of the present application. Figure 6 An enlarged view of the B position in the above-mentioned technical solution is provided for some embodiments of the present application.

[0064] Figure 8 A sectional view of a battery cell is provided for some embodiments of the present application.

[0065] Icon: 10 - box; 11 - first box body; 12 - second box body; 20 - battery cell; 21 - case; 211 - case body; 2111 - second side wall; 2112 - second bottom wall; 2113 - first flow guide passage; 212 - end cover; 213 - wall portion; 2131 - weak portion; 21311 - first surface; 21312 - second surface; 2132 - second groove; 2133 - first groove; 2134 - abutting portion; 21341 - body portion; 21342 - protrusion; 2135 - wall body; 21351 - recessed portion; 21352 - protruding portion; 21353 - fourth surface; 21354 - fifth surface; 2136 - edge portion; 2137 - flow guide space; 2138 - second flow guide passage; 22 - reinforcing portion; 221 - third surface; 222 - first bottom wall; 223 - first side wall; 23 - electrode assembly; 24 - electrode terminal; 25 - current collecting member; 100 - battery device; 200 - controller; 300 - motor; 1000 - vehicle. DETAILED DESCRIPTION

[0066] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the specification of 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, rather than to describe a particular order or primary and secondary relationship.

[0068] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0069] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connected", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be 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.

[0070] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three 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 that the front and rear associated objects have an "or" relationship.

[0071] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0072] "Multiple" appearing in the present application means two or more (including two).

[0073] 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 to continue to use.

[0074] The battery cell includes but is not limited to lithium ion battery, sodium ion battery, sodium lithium ion battery, lithium metal battery, sodium metal battery, lithium sulfur battery, magnesium ion battery, nickel hydrogen battery, nickel cadmium battery, lead-acid battery, etc.

[0075] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0076] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0077] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0078] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum subjected to silver plating on the surface, stainless steel subjected to silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0079] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a positive electrode active material of a battery cell can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04 (which can also be referred to simply as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (which can also be referred to simply as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to simply as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to simply as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to simply as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to simply as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and modified compounds thereof, etc.

[0080] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is employed as the positive electrode, the foamed metal surface can be free of the positive electrode active material, or can be provided with the positive electrode active material. As an example, the foamed metal can be filled or / and deposited with a lithium source material, potassium metal, or sodium metal. The lithium source material can be lithium metal and / or a lithium-rich material.

[0081] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0082] As an example, the negative electrode current collector can employ a metal foil, a foamed metal, or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0083] As an example, the negative electrode sheet can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0084] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0085] As an example, the negative electrode active material can employ a negative electrode active material known in the art for use in a battery cell. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0086] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0087] In some embodiments, the separator is a separator film. The separator film can be any porous structure separator film known to have good chemical stability and mechanical stability.

[0088] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the layers can be the same or different. The separator can be a separate component between the positive and negative electrodes or can be attached to the surface of the positive and negative electrodes.

[0089] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0090] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorobisoxalate borate, lithium bisoxalate borate, lithium difluorobisoxalate phosphate, and lithium tetrafluorobisoxalate phosphate.

[0091] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyrosulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0092] Among them, the gel electrolyte includes a polymer as a skeleton network of the electrolyte, and an ionic liquid-lithium salt.

[0093] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0094] In some embodiments, the electrode assembly is a stacked structure.

[0095] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0096] As an example, the positive electrode sheet can be provided in a plurality of pieces, and the negative electrode sheet can be folded to form a plurality of folded sections stacked one on another, with one positive electrode sheet interposed between adjacent folded sections.

[0097] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded sections stacked one on another.

[0098] As an example, the separator can be provided in a plurality of pieces, each of which is interposed between any adjacent positive electrode sheet or negative electrode sheet.

[0099] As an example, the separator can be provided in a continuous piece, and can be interposed between any adjacent positive electrode sheet or negative electrode sheet by being folded or wound.

[0100] In some embodiments, the electrode assembly can have a flat shape or a polygonal shape.

[0101] In some embodiments, the electrode assembly can be provided with tabs, which can serve to conduct current from the electrode assembly. The tabs can include positive tabs and negative tabs.

[0102] In some embodiments, the battery cell can include a case. The case can serve to enclose the electrode assembly and other components such as the electrolyte. The case can be a steel case, an aluminum case, a composite metal case (e.g., a copper-aluminum composite case), or the like.

[0103] In some embodiments, the case can be a sealed structure or a non-sealed structure. As an example, when the case is a sealed structure, the case can serve to protect the electrode assembly and to prevent, to some extent, leakage of the electrolyte and the like. When the case is a non-sealed structure, the case can serve to protect the electrode assembly, and a sealing bag can be further included between the case and the electrode assembly. The sealing bag can serve to enclose the electrode assembly and the electrolyte and the like. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum laminate film.

[0104] As an example, the battery cell can be a prismatic battery cell or a battery cell having another shape, such as a square battery cell, a blade battery cell, a polygonal battery cell (e.g., a hexagonal battery cell), or the like.

[0105] A battery apparatus according to embodiments of the present application can include one or more battery cell assemblies to provide a voltage and a 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 member.

[0106] In some embodiments, a 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, which is formed by arranging and fixing a plurality of battery cells into a separate module.

[0107] As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0108] In some embodiments, the battery device can be a battery pack, which can include a box and one or more battery cell assemblies, the battery cell assemblies being accommodated in the box.

[0109] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box by fixing the battery module in the box.

[0110] 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.

[0111] As an example, the box can include a first box body and a second box body. The first box body and the second box body 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 body can be a top cover or a bottom plate.

[0112] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0113] 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.

[0114] 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.

[0115] At present, from the development of market situation, the application of batteries is more and more extensive. Batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of batteries, the demand of its market is also increasing.

[0116] The development of battery technology needs to consider various design factors, such as energy density, discharge capacity, charge-discharge rate, and other performance parameters. In addition, the service life of the battery also needs to be considered. However, the service life of the current battery is relatively short.

[0117] During use, gas may be generated inside the battery cell, causing the internal pressure of the battery cell to change, causing the wall of the battery cell for pressure relief to deform, and over time, the wall is prone to being damaged due to fatigue, affecting the service life of the battery cell.

[0118] In view of this, the embodiments of the present application provide a battery cell, which comprises a shell and a reinforcing portion, the shell comprises a wall, the wall has a weak portion, the weak portion is annular, and the weak portion is configured to be at least partially damaged when the battery cell is relieved of pressure. The wall has a first surface in the thickness direction of the wall, the reinforcing portion is arranged on the first surface, the reinforcing portion is annular, and the weak portion is arranged on the outer side of the reinforcing portion.

[0119] The first surface of the wall in the thickness direction is provided with the reinforcing portion, the reinforcing portion strengthens the wall, improves the anti-deformation ability of the wall, improves the fatigue resistance of the wall, reduces the risk of the wall being damaged due to fatigue, makes the wall have a longer service life, and further improves the service life of the battery cell. In addition, the weak portion is annular, the reinforcing portion is annular, and the weak portion is arranged on the outer side of the reinforcing portion. On the one hand, the reinforcing portion has a relatively close strengthening effect on each position of the weak portion, so that the weak portion is more easily completely damaged when the battery cell is relieved of pressure, so that the area of the wall inside the weak portion is easily completely separated from the wall, a larger opening is opened, and the discharge of the battery cell can be quickly relieved through the opening, which is beneficial to improving the timeliness of the pressure relief of the battery cell. On the other hand, when the area of the wall inside the reinforcing portion is deformed under stress, the reinforcing portion can play a buffering role, reducing the stress conducted to the weak portion, thereby reducing the risk of the battery cell opening the valve in advance, and being beneficial to improving the service life and reliability of the battery cell.

[0120] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells and battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0121] The following embodiments are described for convenience with the electric device being a vehicle as an example.

[0122] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The interior of the vehicle 1000 is 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 the operating power supply of the vehicle 1000.

[0123] The vehicle 1000 can also include a controller 200 and a motor 300, the controller 200 being used to control the battery device 100 to supply power to the motor 300, for example, for the power demand of the vehicle 1000 during starting, navigation and driving.

[0124] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also as the driving power supply of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0125] Please refer to Figure 2 , Figure 2 An exploded view of the battery device 100 is provided for some embodiments of the present application. The battery device 100 can include a box body 10 and a battery cell 20, the box body 10 being used to accommodate the battery cell 20.

[0126] The box body 10 is internally formed with a closed space for accommodating the battery cell 20. The box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 being mutually buckled. The first box body 11 and the second box body 12 can be various shapes, such as a cuboid, a cylinder, etc. The first box body 11 can be a hollow structure with one side open, and the second box body 12 can also be a hollow structure with one side open, the open side of the second box body 12 and the open side of the first box body 11 being buckled to each other, thereby forming the box body 10 with a closed space. Alternatively, the first box body 11 can be a hollow structure with one side open, and the second box body 12 can be a plate structure, the second box body 12 being buckled to the open side of the first box body 11, thereby forming the box body 10 with an accommodation space.

[0127] In the battery device 100, the battery cell 20 can be one or multiple. If the battery cell 20 is multiple, the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner, the mixed manner referring to that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be connected in series, in parallel or in a mixed manner to form a battery module, and the multiple battery modules can be connected in series, in parallel or in a mixed manner to form an integral whole, which is accommodated in the box body 10. Alternatively, all the battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and the integral whole formed by all the battery cells 20 is accommodated in the box body 10.

[0128] In some embodiments, the battery device 100 can further comprise a busbar component, through which the plurality of battery cells 20 can be electrically connected to achieve series connection, parallel connection or mixed connection of the plurality of battery cells 20. The busbar component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0129] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 3 An exploded view of the battery cell 20 provided in some embodiments of the present application. Figure 4 A structural schematic view of the wall portion 213 provided in some embodiments of the present application. Figure 5 A top view schematic view of the wall portion 213 provided in some embodiments of the present application. Figure 6 A sectional view of the position A-A in Figure 5 . Figure 7 An enlarged view of the position B in Figure 6 . The battery cell 20 provided in some embodiments of the present application comprises an outer shell 21 and a reinforcing portion 22, the outer shell 21 comprises a wall portion 213, the wall portion 213 has a weak portion 2131, the weak portion 2131 is annular, and the weak portion 2131 is configured to be at least partially destroyed when the battery cell 20 is depressurized. In the thickness direction of the wall portion 213, the wall portion 213 has a first surface 21311, the reinforcing portion 22 is disposed on the first surface 21311, the reinforcing portion 22 is an annular structure, and the weak portion 2131 is annularly disposed on the outer side of the reinforcing portion 22.

[0130] The battery cell 20 refers to the smallest unit that constitutes the battery device 100.

[0131] The outer shell 21 comprises a shell 211 and an end cover 212, the shell 211 has an open containing space for containing the electrode assembly 23. The end cover 212 is connected to the shell 211 and closes the opening.

[0132] The end cover 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the shell 211 to fit the shell 211. Alternatively, the end cover 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 212 is not easily deformed when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength and safety performance can also be improved. The material of the end cover 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application.

[0133] The shell 211 is a component for fitting the end cover 212 to form an internal environment of the battery cell 20, and the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte, and other components. The shell 211 and the end cover 212 can be independent components, and an opening can be provided on the shell 211, and the end cover 212 is fitted to cover the opening to form the internal environment of the battery cell 20. Without limitation, the end cover 212 and the shell 211 can also be integrated, and specifically, the end cover 212 and the shell 211 can form a common joint surface before other components are put into the shell, and when it is necessary to seal the internal environment of the shell 211, the end cover 212 is fitted to cover the shell 211. The shell 211 can be various shapes and sizes, such as a cuboid, a hexagonal prism, and the like. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 211 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like.

[0134] In some embodiments, the shell 211 can be formed with an opening at only one end, and the end cover 212 is correspondingly provided at one end. In other embodiments, the shell 211 can be formed with an opening at both ends, and the end cover 212 is correspondingly provided at two ends, and the two end covers 212 respectively seal the two opposite openings of the shell 211. Figure 3 and Figure 4 In the embodiment shown in the drawings, the shell 211 is formed with an opening at only one end, and the end cover 212 is correspondingly provided at one end.

[0135] The electrode terminal 24 can also be provided on the end cover 212 or the shell 211, and the electrode terminal 24 is used to electrically connect with the tab of the electrode assembly 23 to input or output the electric energy of the battery cell 20. The electrode terminal 24 can be directly connected with the tab, such as being directly welded with the tab. The electrode terminal 24 can also be indirectly connected with the tab, such as being indirectly connected with the tab through the current collecting member 25.

[0136] The electrode assembly 23 is a component in which an electrochemical reaction occurs in the battery cell 20. One or more electrode assemblies 23 can be contained in the shell 211. The electrode assembly 23 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and an insulating member is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion of active material constituting the main body of the electrode assembly 23, and a portion of the positive electrode sheet and the negative electrode sheet not having the active material each constitutes a tab. The positive tab and the negative tab can be located at one end of the main body or at two ends of the main body, respectively. In the charging and discharging process of the battery cell 20, the positive active material and the negative active material react with the electrolyte.

[0137] The wall portion 213 can be the end cover 212 of the shell 21, or a wall of the shell 211 of the shell 21. In some embodiments, the wall portion 213 is a wall of the shell 211 of the shell 21. Figure 3 andFigure 4 In some embodiments, the wall portion 213 is the end cover 212. In other embodiments, the wall portion 213 can be a second bottom wall 2112 of the housing 211 opposite to the end cover 212. In yet other embodiments, the wall portion 213 can also be a second side wall 2111 of the housing 211 adjacent to and connected with the end cover 212.

[0138] The wall portion 213 has a weakened portion 2131 which functions as a pressure relief, for enabling the wall portion 213 to split along the weakened portion 2131 to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value. In some embodiments, the strength of the wall portion 213 at the position of the weakened portion 2131 can be lower than the strength of the wall portion 213 at other positions, so that the weakened portion 2131 can split under the action of the internal pressure to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches the predetermined value. In other embodiments, the melting point of the wall portion 213 at the position of the weakened portion 2131 can be lower than the melting point of the wall portion 213 at other positions. In this way, the weakened portion 2131 can split under the action of high temperature to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches the predetermined value.

[0139] The weakened portion 2131 is annular, i.e. the weakened portion 2131 is a closed structure extending along a closed trajectory. For example, the weakened portion 2131 can be in the shape of a circular ring, an elliptical ring, a racetrack, etc.

[0140] Please refer to Figure 6 and Figure 7 The thickness direction of the wall portion 213 is the X direction shown in the figure.

[0141] The first surface 21311 can be a surface of the wall portion 213 facing the inside of the housing 21 in the thickness direction thereof, or a surface of the wall portion 213 facing away from the inside of the housing 21 in the thickness direction thereof. The first surface 21311 can be a surface of the wall portion 213 closest to the inside of the housing 21 in the thickness direction thereof, or a surface of the wall portion 213 farthest from the inside of the housing 21 in the thickness direction thereof, or a surface of the wall portion 213 between the surface closest to the inside of the housing 21 and the surface farthest from the inside of the housing 21 in the thickness direction thereof. Taking the wall portion 213 as a flat plate structure for example, the wall portion 213 has opposite inner and outer surfaces in the thickness direction thereof, the inner surface faces the inside of the housing 21 in the thickness direction of the wall portion 213, and the first surface 21311 can be the inner surface of the wall portion 213 or the outer surface of the wall portion 213.

[0142] The reinforcing portion 22 is a portion protruding from the first surface 21311 of the wall portion 213 and reinforcing the wall portion 213. The reinforcing portion 22 can improve the rigidity of the wall portion 213 and enhance the deformation resistance of the wall portion 213, thereby improving the deformation resistance of the entire wall portion 213. The reinforcing portion 22 has a ring shape. The reinforcing portion 22 can have a closed structure extending along a closed trajectory, for example, a circular ring shape, an elliptical ring shape, a racetrack shape, etc. Alternatively, the reinforcing portion 22 can have a non-closed structure with a gap at both ends, for example, a 180° circular arc shape, a 270° circular arc shape, etc. Optionally, the reinforcing portion 22 has the same shape as the weak portion 2131. The reinforcing portion 22 can be integrally formed with the wall portion 213, for example, by stamping the reinforcing portion 22 on the wall portion 213 so that the reinforcing portion 22 is integrally formed with the wall portion 213. Alternatively, the reinforcing portion 22 can be separately provided and connected to the wall portion 213, for example, by welding.

[0143] The weak portion 2131 is arranged around the outside of the reinforcing portion 22, i.e., the weak portion 2131 surrounds the outside of the reinforcing portion 22. In other words, the reinforcing portion 22 is arranged in the region of the wall portion 213 inside the weak portion 2131.

[0144] The first surface 21311 of the wall portion 213 in the thickness direction is provided with the reinforcing portion 22. The reinforcing portion 22 reinforces the wall portion 213, improves the deformation resistance of the wall portion 213, improves the fatigue resistance of the wall portion 213, reduces the risk of the wall portion 213 being damaged due to fatigue, prolongs the service life of the wall portion 213, and thereby prolongs the service life of the battery monomer 20. In addition, the weak portion 2131 has a ring shape, the reinforcing portion 22 has a ring shape, and the weak portion 2131 is arranged around the outside of the reinforcing portion 22. On the one hand, the reinforcing portion 22 has a similar reinforcing effect on each position of the weak portion 2131, so that the weak portion 2131 is more likely to be completely damaged when the battery monomer 20 is depressurized, so that the region of the wall portion 213 inside the weak portion 2131 is easily completely separated from the wall portion 213 to open a large opening, and the discharge in the battery monomer 20 can quickly depressurize through the opening, which is beneficial to improving the timeliness of the battery monomer 20. On the other hand, when the region of the wall portion 213 inside the reinforcing portion 22 is deformed under stress, the reinforcing portion 22 can act as a buffer to reduce the stress transmitted to the weak portion 2131, thereby reducing the risk of the battery monomer 20 opening prematurely, and improving the service life and reliability of the battery monomer 20.

[0145] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7In some embodiments, the distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213 is L, which satisfies: 1 mm ≤ L ≤ 4 mm.

[0146] L represents the distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213. For example, when the wall portion 213 has a disc structure, L represents the distance between the weakened portion 2131 and the reinforcing portion 22 in the radial direction of the wall portion 213.

[0147] The distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213 can be the same at different positions of the weakened portion 2131, for example, the weakened portion 2131 and the reinforcing portion 22 are both circular rings, and the weakened portion 2131 and the reinforcing portion 22 are coaxially arranged. The distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213 can also be different at different positions of the weakened portion 2131, in which case the minimum distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213 is greater than or equal to 1 mm, and the maximum distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213 is less than or equal to 4 mm.

[0148] The distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213 can be: L = 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc.

[0149] When L ≥ 1 mm, the distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213 is large, so that the reinforcing portion 22 is not easy to affect the weakened portion 2131 when arranged, which is conducive to reducing the risk of early valve opening of the battery monomer 20 and improving the service life and reliability of the battery monomer 20. When L ≤ 4 mm, the distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213 is not too large, so that the area of the wall portion 213 inside the reinforcing portion 22 is large, thereby enabling the reinforcing portion 22 to play a better buffering role, reducing the risk of early valve opening of the battery monomer 20, and improving the service life and reliability of the battery monomer 20. Therefore, when 1 mm ≤ L ≤ 4 mm, the battery monomer 20 has a longer service life and higher reliability.

[0150] Optionally, 2 mm ≤ L ≤ 3 mm.

[0151] The distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213 can be: L = 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, etc.

[0152] When L≥2mm, in the direction perpendicular to the thickness direction of the wall portion 213, the distance between the weakened portion 2131 and the reinforcing portion 22 is greater, so that the reinforcing portion 22 is less likely to affect the weakened portion 2131 when arranged, and is more conducive to reducing the risk of the battery monomer 20 prematurely opening the valve, and is conducive to improving the service life and reliability of the battery monomer 20. When L≤3mm, in the direction perpendicular to the thickness direction of the wall portion 213, the distance between the weakened portion 2131 and the reinforcing portion 22 is not too large, so that the area of the wall portion 213 inside the reinforcing portion 22 is larger, thereby enabling the reinforcing portion 22 to play a better buffering role, reducing the risk of the battery monomer 20 prematurely opening the valve, and being conducive to improving the service life and reliability of the battery monomer 20. Therefore, when 2mm≤L≤3mm, the battery monomer 20 has a longer service life and higher reliability.

[0153] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , in some embodiments, in the direction perpendicular to the thickness direction of the wall portion 213, the distance between the weakened portion 2131 and the reinforcing portion 22 is less than the distance from the reinforcing portion 22 to the central axis of the weakened portion 2131.

[0154] The central axis of the weakened portion 2131 is an axis parallel to the thickness direction of the wall portion 213 and passing through the geometric center of the weakened portion 2131. When the weakened portion 2131 is a circular ring, the central axis of the weakened portion 2131 is an axis parallel to the thickness direction of the wall portion 213 and passing through the center of the circular ring. When the weakened portion 2131 is a rectangular ring, the central axis of the weakened portion 2131 is an axis parallel to the thickness direction of the wall portion 213 and passing through the intersection of the diagonals of the rectangle.

[0155] Please refer to Figure 6 , Figure 6 for the central axis of the weakened portion 2131 being identified by a dashed line.

[0156] "The distance between the weakened portion 2131 and the reinforcing portion 22 in the direction perpendicular to the thickness direction of the wall portion 213 is less than the distance from the reinforcing portion 22 to the central axis of the weakened portion 2131" means that: in the direction perpendicular to the thickness direction of the wall portion 213, the maximum distance between the weakened portion 2131 and the reinforcing portion 22 is less than the minimum distance from the reinforcing portion 22 to the central axis of the weakened portion 2131, in other words, the reinforcing portion 22 is closer to the weakened portion 2131 than the central axis of the weakened portion 2131.

[0157] In the direction perpendicular to the thickness direction of the wall portion 213, the distance between the weakened portion 2131 and the reinforcing portion 22 is less than the distance from the reinforcing portion 22 to the central axis of the weakened portion 2131, so that the area of the wall portion 213 inside the reinforcing portion 22 is larger, thereby enabling the reinforcing portion 22 to play a better buffering role, reducing the risk of the battery monomer 20 opening the valve in advance, and being beneficial to improving the service life and reliability of the battery monomer 20.

[0158] Please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 In some embodiments, the weakened portion 2131 and the reinforcing portion 22 are both circular rings, and the distance between the axis of the weakened portion 2131 and the axis of the reinforcing portion 22 is less than or equal to 1 mm.

[0159] The distance between the axis of the weakened portion 2131 and the axis of the reinforcing portion 22 being less than or equal to 1 mm can also be understood as the distance between the center line of the weakened portion 2131 and the center line of the reinforcing portion 22 being less than or equal to 1 mm.

[0160] The weakened portion 2131 and the reinforcing portion 22 are both circular rings, and the distance between the axis of the weakened portion 2131 and the axis of the reinforcing portion 22 is less than or equal to 1 mm, so that the weakened portion 2131 and the reinforcing portion 22 are coaxially arranged, so that the reinforcing effect of the reinforcing portion 22 on each position of the weakened portion 2131 is more close, and the stress on each position of the weakened portion 2131 is more uniform when the battery monomer 20 is pressure released, so that the weakened portion 2131 is more easily completely destroyed when the battery monomer 20 is pressure released, so that the area of the wall portion 213 inside the weakened portion 2131 is more easily completely separated from the wall portion 213 to open a larger opening, and the discharge in the battery monomer 20 can be quickly pressure released through the opening, which is beneficial to improving the timeliness of the pressure release of the battery monomer 20.

[0161] Optionally, the axis of the weakened portion 2131 and the axis of the reinforcing portion 22 coincide.

[0162] The weakened portion 2131 and the reinforcing portion 22 are both circular rings, and the axis of the weakened portion 2131 and the axis of the reinforcing portion 22 coincide, so that the weakened portion 2131 and the reinforcing portion 22 are coaxially arranged, so that the reinforcing effect of the reinforcing portion 22 on each position of the weakened portion 2131 is the closest, and the stress on each position of the weakened portion 2131 is more uniform when the battery monomer 20 is pressure released, so that the weakened portion 2131 is more easily completely destroyed when the battery monomer 20 is pressure released, so that the area of the wall portion 213 inside the weakened portion 2131 is more easily completely separated from the wall portion 213 to open a larger opening, and the discharge in the battery monomer 20 can be quickly pressure released through the opening, which is beneficial to improving the timeliness of the pressure release of the battery monomer 20.

[0163] Please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 In some embodiments, the wall portion 213 has a second surface 21312 opposite to the first surface 21311, and the wall portion 213 is provided with a first groove 2133 in the form of a ring. The first groove 2133 is recessed from the second surface 21312 in a direction close to the first surface 21311, and forms a reinforcing portion 22 protruding from the first surface 21311 at a position of the wall portion 213 corresponding to the first groove 2133.

[0164] The second surface 21312 is a surface of the wall portion 213 opposite to the first surface 21311. The second surface 21312 can be a surface of the wall portion 213 facing the inside of the shell 21 in the thickness direction thereof, or a surface of the wall portion 213 facing away from the inside of the shell 21 in the thickness direction thereof. When the first surface 21311 is a surface of the wall portion 213 facing the inside of the shell 21 in the thickness direction thereof, the second surface 21312 is a surface of the wall portion 213 facing away from the inside of the shell 21 in the thickness direction thereof.

[0165] The second surface 21312 can be a surface of the wall portion 213 closest to the inside of the shell 21 in the thickness direction thereof, or a surface of the wall portion 213 farthest from the inside of the shell 21 in the thickness direction thereof, or a surface of the wall portion 213 between the surface closest to the inside of the shell 21 in the thickness direction thereof and the surface farthest from the inside of the shell 21 in the thickness direction thereof. Taking the wall portion 213 as a flat plate structure as an example, the wall portion 213 has opposite inner and outer surfaces in the thickness direction thereof, the inner surface faces the inside of the shell 21 in the thickness direction of the wall portion 213, and the second surface 21312 can be the inner surface of the wall portion 213 or the outer surface of the wall portion 213. When the first surface 21311 is the inner surface of the wall portion 213, the second surface 21312 can be the outer surface of the wall portion 213.

[0166] The first groove 2133 is a groove provided on the second surface 21312, and the shape of the first groove 2133 is the same as that of the reinforcing portion 22.

[0167] During molding, the first groove 2133 can be formed on the second surface 21312 by stamping, thereby forming the reinforcing portion 22 protruding from the first surface 21311. The reinforcing portion 22 is formed in a simple manner. The provision of the first groove 2133 forms a recessed structure at the position of the wall portion 213 where the reinforcing portion 22 is provided, so that the reinforcing portion 22 has better deformation resistance, thereby improving the reinforcing effect of the reinforcing portion 22 on the wall portion 213.

[0168] Please refer to Figure 3 、 Figure 4 ,Figure 5 、 Figure 6 and Figure 7 In some embodiments, the reinforcing portion 22 has a third surface 221 farthest from the first surface 21311 in the thickness direction of the wall portion 213. The distance between the groove bottom surface of the first groove 2133 and the third surface 221 is H1, and the distance between the first surface 21311 and the second surface 21312 is H2, and the following is satisfied: 0.5 ≤ H1 / H2 ≤ 1.5.

[0169] The third surface 221 is the surface of the reinforcing portion 22 farthest from the first surface 21311 in the thickness direction of the wall portion 213, and also the surface of the reinforcing portion 22 farthest from the groove bottom surface of the first groove 2133 in the thickness direction of the wall portion 213.

[0170] H1 represents the distance between the groove bottom surface of the first groove 2133 and the third surface 221 in the thickness direction of the wall portion 213. When measuring, it can be measured multiple times and the average value is taken as H1.

[0171] H2 represents the distance between the first surface 21311 and the second surface 21312 in the thickness direction of the wall portion 213. When measuring, it can be measured multiple times and the average value is taken as H2.

[0172] H1 / H2 represents the ratio of the distance between the groove bottom surface of the first groove 2133 and the third surface 221 in the thickness direction of the wall portion 213 and the distance between the first surface 21311 and the second surface 21312 in the thickness direction of the wall portion 213.

[0173] The ratio of the distance between the groove bottom surface of the first groove 2133 and the third surface 221 in the thickness direction of the wall portion 213 and the distance between the first surface 21311 and the second surface 21312 in the thickness direction of the wall portion 213 can be: H1 / H2 = 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc.

[0174] When H1 / H2≥0.5, the distance between the groove bottom surface of the first groove 2133 and the third surface 221 along the thickness direction of the wall portion 213 is larger, and the reinforcing portion 22 has better reinforcing effect and buffering effect. When H1 / H2≤1.5, the distance between the groove bottom surface of the first groove 2133 and the third surface 221 along the thickness direction of the wall portion 213 is not too large, which is beneficial to reduce the occupation of the reinforcing portion 22 to the internal space of the battery monomer 20 or the internal space of the battery device 100, and is beneficial to improve the energy density of the battery monomer 20 or the battery device 100. When 0.5≤H1 / H2≤1.5, the distance between the groove bottom surface of the first groove 2133 and the third surface 221 along the thickness direction of the wall portion 213 is relatively close to the distance between the first surface 21311 and the second surface 21312, which is convenient for processing the reinforcing portion 22 by stamping, and can balance the reinforcing effect, the buffering effect of the reinforcing portion 22 and the energy density of the battery monomer 20.

[0175] Optionally, 0.8≤H1 / H2≤1.2.

[0176] The ratio of the distance between the groove bottom surface of the first groove 2133 and the third surface 221 along the thickness direction of the wall portion 213 to the distance between the first surface 21311 and the second surface 21312 can be: H1 / H2=0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, etc.

[0177] When H1 / H2≥0.8, the distance between the groove bottom surface of the first groove 2133 and the third surface 221 along the thickness direction of the wall portion 213 is larger, and the reinforcing portion 22 has better reinforcing effect and buffering effect. When H1 / H2≤1.2, the distance between the groove bottom surface of the first groove 2133 and the third surface 221 along the thickness direction of the wall portion 213 is not too large, which is beneficial to reduce the occupation of the reinforcing portion 22 to the internal space of the battery monomer 20 or the internal space of the battery device 100, and is beneficial to improve the energy density of the battery monomer 20 or the battery device 100. When 0.8≤H1 / H2≤1.2, the distance between the groove bottom surface of the first groove 2133 and the third surface 221 along the thickness direction of the wall portion 213 is more close to the distance between the first surface 21311 and the second surface 21312, which is convenient for processing the reinforcing portion 22 by stamping, and can balance the reinforcing effect, the buffering effect of the reinforcing portion 22 and the energy density of the battery monomer 20.

[0178] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7In some embodiments, along the thickness direction of the wall portion 213, the height of the reinforcing portion 22 protruding from the first surface 21311 is H3, the distance between the first surface 21311 and the second surface 21312 is H2, and the following condition is satisfied: 1 / 3≤H3 / H2≤1.

[0179] H3 represents the height of the reinforcing portion 22 protruding from the first surface 21311 along the thickness direction of the wall portion 213, i.e., the distance between the first surface 21311 and the third surface 221 along the thickness direction of the wall portion 213. When measuring, the average value of multiple measurements can be taken as H3.

[0180] H3 / H2 represents the ratio of the height of the reinforcing portion 22 protruding from the first surface 21311 along the thickness direction of the wall portion 213 to the distance between the first surface 21311 and the second surface 21312 along the thickness direction of the wall portion 213.

[0181] The ratio of the height of the reinforcing portion 22 protruding from the first surface 21311 along the thickness direction of the wall portion 213 to the distance between the first surface 21311 and the second surface 21312 along the thickness direction of the wall portion 213 can be: H3 / H2=1 / 3, 1 / 2, 2 / 3, 3 / 4, 4 / 5, 1, etc.

[0182] When H3 / H2≥1 / 3, along the thickness direction of the wall portion 213, the height of the reinforcing portion 22 protruding from the first surface 21311 is higher, and the reinforcing portion 22 has better reinforcing effect and buffering effect. When H3 / H2≤1, along the thickness direction of the wall portion 213, the height of the reinforcing portion 22 protruding from the first surface 21311 is not too high, on the one hand, when the reinforcing portion 22 is processed by stamping, it is not easy to cause the material to be excessively stretched to form a weak position. On the other hand, it is beneficial to reduce the occupation of the reinforcing portion 22 to the internal space of the battery monomer 20 or the internal space of the battery device 100, and is beneficial to improve the energy density of the battery monomer 20 or the battery device 100. When 1 / 3≤H3 / H2≤1, the reinforcing effect, the buffering effect of the reinforcing portion 22 and the energy density of the battery monomer 20 can be considered.

[0183] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the wall portion 213 is provided with a second groove 2132, and the groove bottom wall of the second groove 2132 forms a weak portion 2131. Along the thickness direction of the wall portion 213, the groove bottom surface of the first groove 2133 is closer to the first surface 21311 than the groove bottom surface of the second groove 2132.

[0184] The second groove 2132 is a groove provided on the wall portion 213. The first surface 21311 can be provided with the second groove 2132, or the second surface 21312 can be provided with the second groove 2132. Taking the first surface 21311 provided with the second groove 2132 as an example, the second groove 2132 is recessed from the first surface 21311 toward the second surface 21312, and the weak portion 2131 is the portion between the groove bottom surface of the second groove 2132 and the second surface 21312.

[0185] The second groove 2132 can be formed in various ways, such as punch forming, cold heading, and the like. Taking the punch forming as an example, the second groove 2132 can be punch formed on the wall portion 213 along the thickness direction of the wall portion 213.

[0186] The punch forming or cold heading of the second groove 2132 causes the cold work hardening of the groove wall of the second groove 2132 (change in grain arrangement, resulting in lattice distortion and deformation, reducing the plasticity of the metal and increasing the hardness of the material), which enhances the ability of the second groove 2132 to resist external impact and is not easily damaged by external impact.

[0187] It can be understood that, along the thickness direction of the wall portion 213, the groove bottom surface of the first groove 2133 is located between the groove bottom surface of the second groove 2132 and the first surface 21311.

[0188] The groove bottom surface of the first groove 2133 can be a plane or a circular arc surface. The groove bottom surface of the second groove 2132 can be a plane or a circular arc surface. As an example, in the embodiment shown in the drawings, the groove bottom surface of the first groove 2133 and the groove bottom surface of the second groove 2132 are both planes and are both parallel to the first surface 21311. Figure 7

[0189] By making the groove bottom surface of the first groove 2133 closer to the first surface 21311 than the groove bottom surface of the second groove 2132 along the thickness direction of the wall portion 213, when the area of the wall portion 213 inside the reinforcing portion 22 is deformed under stress, the reinforcing portion 22 can better buffer the stress, reducing the risk of the battery monomer 20 opening the valve prematurely, thereby improving the life and reliability of the battery monomer 20.

[0190] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 ​In some embodiments, the reinforcing portion 22 has a first sidewall 223 and a first bottom wall 222. The first sidewall 223 surrounds the first bottom wall 222, and the first sidewall 223 and the first bottom wall 222 together define a first groove 2133. The thickness of the first sidewall 223 is H4, and the distance between the first surface 21311 and the second surface 21312 along the thickness direction of the wall portion 213 is H2, satisfying: H4 ≤ H2.

[0191] The first bottom wall 222 is a wall provided along the thickness direction of the wall portion 213 of the reinforcing part 22. Along the thickness direction of the wall portion 213, the first bottom wall 222 is positioned opposite the opening of the first groove 2133. The first side wall 223 is the portion of the reinforcing part 22 surrounding the first bottom wall 222. The extension trajectory of the first side wall 223 has the same shape as the first groove 2133. The thickness of the first side wall 223 can be uniform or non-uniform. If the thickness of the first side wall 223 is uniform, the maximum thickness of the first side wall 223 is equal to the minimum thickness of the first side wall 223, and both the maximum and minimum thickness of the first side wall 223 are H4.

[0192] exist Figure 7 In the embodiment shown, the thickness of the first sidewall 223 is non-uniform. Along the depth direction of the first groove 2133, the thickness of the first sidewall 223 gradually decreases. At this time, H4≤H2, that is, the maximum thickness of the first sidewall 223 is less than or equal to the distance between the first surface 21311 along the thickness direction of the wall portion 213 and the second surface 21312.

[0193] When H4≤H2, the thickness of the first sidewall 223 does not exceed the distance between the first surface 21311 and the second surface 21312, which simplifies the forming process. The reinforcing part 22 can be formed by stamping, and the forming method is simple.

[0194] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, along the thickness direction of the wall portion 213, the thickness of the first bottom wall 222 is H1, and the distance between the first surface 21311 and the second surface 21312 is H2, satisfying: H1≤H2.

[0195] The thickness of the first bottom wall 222 along the thickness direction of the wall portion 213 is equal to the distance between the bottom surface of the first groove 2133 along the thickness direction of the wall portion 213 and the third surface 221.

[0196] The thickness of the first bottom wall 222 can be uniform or non-uniform. When the thickness of the first bottom wall 222 is uniform, the maximum thickness of the first bottom wall 222 is equal to the minimum thickness of the first bottom wall 222, and both the maximum thickness of the first bottom wall 222 and the minimum thickness of the first bottom wall 222 are H1.

[0197] The thickness of the first bottom wall 222 can also be non-uniform. For example, along the width direction of the first groove 2133, the thickness of the first bottom wall 222 gradually increases from the middle to the two ends. At this time, H1≤H2, that is, the maximum thickness of the first bottom wall 222 is less than or equal to the distance between the first surface 21311 and the second surface 21312 along the thickness direction of the wall portion 213.

[0198] When H1≤H2, the thickness of the first bottom wall 222 does not exceed the distance between the first surface 21311 and the second surface 21312, which can simplify the molding process and can be molded by stamping the reinforcing portion 22, which is simple in molding method.

[0199] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the wall portion 213 is provided with a second groove 2132, and the groove bottom wall of the second groove 2132 forms a weak portion 2131.

[0200] The weak portion 2131 is formed on the wall portion 213 by opening the second groove 2132 on the wall portion 213. When the battery monomer 20 is pressure released, the wall portion 213 is cracked along at least a portion of the second groove 2132, which is simple and convenient and has low cost.

[0201] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the second groove 2132 is arranged on the first surface 21311.

[0202] The reinforcing portion 22 protrudes from the first surface 21311, and the second groove 2132 is arranged on the first surface 21311, that is, the reinforcing portion 22 and the second groove 2132 are arranged on the same surface.

[0203] When the reinforcing portion 22 and the second groove 2132 are processed by stamping, the wall portion 213 is stamped from both sides of the wall portion 213, so that the wall portion 213 is not easily deformed toward one side.

[0204] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 andFigure 7 In some embodiments, the first surface 2131 faces the inside of the case 21.

[0205] Since the reinforcing portion 22 is provided to the first surface 2131, the first surface 2131 faces the inside of the case 21, the reinforcing portion 22 can utilize the inside space of the battery cell 20, and the reinforcing portion 22 does not occupy the space outside the battery cell 20. In the embodiments in which the second groove 2132 is provided to the first surface 2131, the first surface 2131 faces the inside of the case 21, so that the second groove 2132 faces the inside of the battery cell 20, and the second groove 2132 is not exposed to the outside of the battery cell 20, reducing the risk of oxidation of the position where the wall portion 213 is provided with the second groove 2132 due to exposure to the outside of the battery cell 20.

[0206] Please refer to Figure 8 , Figure 8 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 7 A cross-sectional view of the battery cell 20 is provided for some embodiments of the present application. In some embodiments, the battery cell 20 includes an electrode assembly 23 accommodated in the case 21. The wall portion 213 includes a wall body 2135 and an abutting portion 2134 provided around the outer edge of the wall body 2135. In the thickness direction of the wall portion 213, the abutting portion 2134 protrudes from the wall body 2135 in the direction close to the electrode assembly 23 and directly or indirectly abuts against the electrode assembly 23, and the wall body 2135 includes a weak portion 2131.

[0207] The wall body 2135 and the abutting portion 2134 can be integrally formed or separately provided and connected. The weak portion 2131 can be formed by providing a groove on the wall body 2135, or by heat treating a local part of the wall body 2135 to weaken the strength of the local area to correspondingly form the weak portion 2131.

[0208] The abutting portion 2134 can be an annular structure surrounding the outer edge of the wall body 2135, which can be a circular ring structure, a rectangular ring structure, etc. After the abutting portion 2134 directly or indirectly abuts against the electrode assembly 23, the abutting portion 2134 and the electrode assembly 23 can be electrically connected or insulated. If the abutting portion 2134 directly abuts against the electrode assembly 23, the abutting portion 2134 directly contacts the electrode assembly 23, for example, the abutting portion 2134 directly abuts against the tab at the end of the electrode assembly 23, so as to realize the electrical connection between the wall portion 213 and the electrode assembly 23; if the abutting portion 2134 indirectly abuts against the electrode assembly 23, an intermediate piece is arranged between the abutting portion 2134 and the electrode assembly 23, which can be an insulating piece or a conductive piece. Taking the intermediate piece as the current collecting member 25 for example, the abutting portion 2134 indirectly abuts against the tab at the end of the electrode assembly 23 through the current collecting member 25, so as to realize the electrical connection between the wall portion 213 and the electrode assembly 23.

[0209] The abutting portion 2134 of the wall portion 213 directly or indirectly abuts against the electrode assembly 23, and the abutting portion 2134 can limit the electrode assembly 23 and reduce the risk of movement of the electrode assembly 23 in the shell 21.

[0210] Please refer to Figure 8 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 In some embodiments, the shell 21 includes a second side wall 2111 surrounding the wall portion 213, and the wall portion 213 is located at one end of the second side wall 2111 along the thickness direction of the wall portion 213. A first flow channel 2113 is formed between the electrode assembly 23 and the second side wall 2111, the abutting portion 2134 and the wall body 2135 jointly define a flow space 2137, and the abutting portion 2134 is provided with a second flow channel 2138 communicating the flow space 2137 and the first flow channel 2113.

[0211] In the embodiment in which the shell 211 only has an opening at one end, the end cover 212 can be the wall portion 213, and the second side wall 2111 is a part of the shell 211; or the second bottom wall 2112 opposite to the end cover 212 of the shell 211 can be the wall portion 213, and the second side wall 2111 and the wall portion 213 are integrally formed to constitute the shell 211. In the embodiment in which the shell 211 has openings at opposite ends, at least one of the two end covers 212 can be the wall portion 213, and the second side wall 2111 is the shell 211.

[0212] The second side wall 2111 can be in a cylindrical shape, such that the battery cell 20 is a cylindrical battery cell; the second side wall 2111 can also be in a cuboid shape, such that the battery cell 20 is a square can battery cell or a blade battery cell. The second side wall 2111 and the wall portion 213 can be integrally formed, and the second side wall 2111 and the wall portion 213 constitute the housing 211, and an end of the second side wall 2111 away from the wall portion 213 forms an opening of the housing 211; or the second side wall 2111 and the wall portion 213 can be separately provided, and the wall portion 213 is an end cover 212, and an end of the second side wall 2111 close to the wall portion 213 forms an opening of the housing 211. In the embodiment in which the second side wall 2111 and the wall portion 213 are separately provided, the wall portion 213 and the second side wall 2111 can be connected by welding, bonding, crimping or the like.

[0213] The first flow channel 2113 can be a gap formed between the outer circumferential surface of the main body portion and the inner circumferential surface of the second side wall 2111 and the outer circumferential surface of the tab. Of course, if the outer circumferential surface of the main body portion is covered with an insulating film, the first flow channel 2113 can be a gap formed between the outer circumferential surface of the insulating film and the inner circumferential surface of the second side wall 2111 and the outer circumferential surface of the tab. The inner circumferential surface of the second side wall 2111 is a surface of the second side wall 2111 facing the electrode assembly 23, and the inner circumferential surface can extend a full circumference along the opening of the outer shell 21. It can be understood that, if the second side wall 2111 is in a cylindrical shape, the inner circumferential surface of the second side wall 2111 is in a cylindrical shape; if the second side wall 2111 is in a cuboid shape, the inner circumferential surface of the second side wall 2111 is in a cuboid shape.

[0214] The flow guide space 2137 defined by the wall body 2135 and the abutting portion 2134 corresponds to a region of the wall portion 213 inside the weak portion 2131, and after the weak portion 2131 is cracked, the discharge material in the flow guide space 2137 can be discharged to the outside of the battery cell 20 through the region of the wall portion 213 inside the weak portion 2131. The flow guide space 2137 is formed with an opening portion at an end of the abutting portion 2134 close to the electrode assembly 23, and after the abutting portion 2134 directly or indirectly abuts against the electrode assembly 23, the opening portion is covered. It can be understood that, if the abutting portion 2134 directly abuts against the electrode assembly 23, the opening portion of the flow guide space 2137 is covered by the electrode assembly 23; if the abutting portion 2134 indirectly abuts against the electrode assembly 23 through an intermediate piece, the opening portion of the flow guide space 2137 is covered by the intermediate piece.

[0215] The second flow channel 2138 on the abutting portion 2134 can be one or multiple. If the second flow channel 2138 is multiple, the multiple flow channels can be uniformly distributed along the circumference of the abutting portion 2134, or can be non-uniformly distributed along the circumference of the abutting portion 2134.

[0216] The second flow guide channel 2138 can be a through hole provided on the abutting portion 2134, or can be a notch groove.

[0217] Due to the abutting portion 2134 being provided with the second flow guide channel 2138, the second flow guide channel 2138 communicates the flow guide space 2137 and the first flow guide channel 2113. When the battery monomer 20 is in thermal runaway, the exhaust generated by the electrode assembly 23 flows into the first flow guide channel 2113, and then the exhaust can quickly flow to the flow guide space 2137 through the second flow guide channel 2138 on the abutting portion 2134, so that the air pressure in the flow guide space 2137 quickly rises to quickly reach the burst pressure, so that the weak portion 2131 can be timely damaged, the time from the thermal runaway of the battery monomer 20 to the pressure relief of the battery monomer 20 is shortened, the risk of explosion and fire of the battery monomer 20 is reduced, and the reliability of the battery monomer 20 is effectively improved.

[0218] Optionally, the abutting portion 2134 includes a body portion 21341 and a plurality of protrusions 21342, the body portion 21341 is annularly arranged on the outer edge of the wall body 2135 and protrudes from the wall body 2135 in a direction close to the electrode assembly 23, the body portion 21341 has a fifth surface 21354 facing the electrode assembly 23, and the protrusions 21342 are arranged on the fifth surface 21354 and directly abut against the current collecting member 25. Along the circumferential direction of the abutting portion 2134, a second flow guide channel 2138 is formed between two adjacent protrusions 21342.

[0219] Please refer to Figure 8 , Figure 7 , Figure 3 , Figure 4 , Figure 5 and Figure 6 In some embodiments, the wall portion 213 further includes an edge portion 2136, the edge portion 2136 is annularly arranged on the outer edge of the abutting portion 2134, and the edge portion 2136 abuts against one end of the second side wall 2111 in a direction of the wall portion 213 pointing to the electrode assembly 23.

[0220] The edge portion 2136 is an annular structure annularly arranged on the outer edge of the abutting portion 2134. The outer edge of the edge portion 2136 is the outer edge of the wall portion 213.

[0221] As an example, the second side wall 2111 is part of the shell 211, the shell 211 only one end forms an opening, the edge portion 2136 abuts against one end of the shell 211 forming the opening in a direction of the wall portion 213 pointing to the electrode assembly 23, and the edge portion 2136 is welded to the second side wall 2111.

[0222] The edge portion 2136 abutting against the second side wall 2111 can limit the wall portion 213 from moving in a direction close to the electrode assembly 23.

[0223] Please refer to Figure 7 、 Figure 8 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 In some embodiments, along the thickness direction of the wall portion 213, the wall body 2135 has a fourth surface 21353 and a fifth surface 21354 arranged oppositely, the fourth surface 21353 faces the electrode assembly 23, the wall body 2135 is provided with a recess 21351, the recess 21351 is recessed from the fifth surface 21354 in a direction close to the fourth surface 21353, and a convex portion 21352 convex to the fourth surface 21353 is formed at a position of the wall body 2135 corresponding to the recess 21351, a surface of the convex portion 21352 facing the electrode assembly 23 is the first surface 21311; along the thickness direction of the wall portion 213, the orthographic projection of the weak portion 2131 is located in the recess 21351.

[0224] The fourth surface 21353 faces the inside of the shell 21, and the fourth surface 21353 and the first surface 21311 can be the same surface of the wall body 2135; in Figure 7 the embodiment shown, the fourth surface 21353 and the first surface 21311 can also be two surfaces with a distance in the thickness direction of the wall portion 213. The fifth surface 21354 is a surface of the wall body 2135 facing away from the inside of the shell 21 along the thickness direction of the wall portion 213, and the fifth surface 21354 can be a circular ring surface surrounding the outside of the recess 21351.

[0225] The orthographic projection of the weak portion 2131 in the thickness direction of the wall portion 213 is located in the recess 21351, and the weak portion 2131 is a portion between the groove bottom surface of the second groove 2132 and the bottom surface of the recess 21351.

[0226] The provision of the recess 21351 causes a certain distance to exist between the area of the wall portion 213 inside the weak portion 2131 and the fifth surface 21354, and when the fifth surface 21354 contacts the external component, the influence of the external component on the area of the wall portion 213 inside the weak portion 2131 can be reduced, so that the area of the wall portion 213 inside the weak portion 2131 can open outward when the battery monomer 20 is depressurized, and the risk that the area of the wall portion 213 inside the weak portion 2131 cannot be normally opened due to the blocking effect of the external component can be reduced.

[0227] Please refer to Figure 8 ,​ 、 ​ 、 ​ 、 ​ and ​ In some embodiments, the shell 21 comprises a housing 211 having an opening and an end cover 212 closing the opening, the end cover 212 being the wall portion 213.

[0228] The end cover 212 is the wall portion 213, so that the end cover 212 is provided with a weakened portion 2131, which reduces the difficulty of forming or installing the weakened portion 2131.

[0229] Please refer to ​ 、 ​ 、 ​ 、 ​ 、 ​ and ​ In some embodiments, the battery cell 20 is a cylindrical battery cell, and the thickness direction of the wall portion 213 is parallel to the axial direction of the cylindrical battery cell.

[0230] The embodiments of the present application also provide a battery device 100, which comprises the battery cell 20 described above.

[0231] In some embodiments, along the thickness direction of the wall portion 213, the wall portion 213 has a fourth surface 21353 and a fifth surface 21354 arranged oppositely, and the fourth surface 21353 faces the interior of the shell 21. The wall portion 213 is provided with a recessed portion 21351 recessed from the fifth surface 21354 in a direction close to the fourth surface 21353, and forms a protruding portion 21352 protruding from the fourth surface 21353 at a position of the wall portion 213 corresponding to the recessed portion 21351. The surface of the protruding portion 21352 facing the interior of the shell 21 is the first surface 21311. Along the thickness direction of the wall portion 213, the orthographic projection of the weakened portion 2131 is located in the recessed portion 21351. The battery device 100 further comprises a box body 10, and the battery cell 20 is accommodated in the box body 10. The battery cell 20 is fixed to the box body 10 by a glue layer, and the glue layer is at least partially accommodated in the recessed portion 21351.

[0232] The glue layer is a structure formed after the curing of a glue material, and the glue material can be a structural adhesive.

[0233] By at least partially accommodating the glue layer in the recessed portion 21351, on the one hand, the space occupied by the glue layer in the interior of the box body 10 can be reduced, and the energy density of the battery device 100 can be improved. On the other hand, at least partially accommodating the glue layer in the recessed portion 21351 makes the contact area between the glue layer and the wall portion 213 larger, and the adhesion strength between the battery cell 20 and the box body 10 can be improved.

[0234] In some embodiments, the wall portion 213 is provided with a first groove 2133 in a ring shape. The first groove 2133 is recessed from the bottom surface of the recessed portion 21351 in a direction close to the first surface 21311, and forms a reinforcing portion 22 protruding from the first surface 21311 at a position of the wall portion 213 corresponding to the first groove 2133.

[0235] When being formed, the first groove 2133 can be formed on the bottom surface of the recessed portion 21351 by stamping, and then the reinforcing portion 22 protruding from the first surface 21311 is formed. The reinforcing portion 22 is formed in a simple manner. The first groove 2133 is arranged to form a recessed structure at the position of the wall portion 213 where the reinforcing portion 22 is arranged, so that the reinforcing portion 22 has better deformation resistance, and the reinforcing effect of the reinforcing portion 22 on the wall portion 213 is improved.

[0236] In some embodiments, a part of the adhesive layer is accommodated in the first groove 2133.

[0237] Optionally, a part of the adhesive layer is accommodated in the recessed portion 21351, and another part of the adhesive layer is accommodated in the first groove 2133.

[0238] By accommodating a part of the adhesive layer in the first groove 2133, on the one hand, the space occupation of the adhesive layer in the battery device 100 can be reduced, and the energy density of the battery device 100 can be improved. On the other hand, the adhesive layer is at least partially accommodated in the first groove 2133, so that the contact area between the adhesive layer and the wall portion 213 is larger, and the bonding strength between the battery monomer 20 and the box body 10 can be improved.

[0239] In other embodiments, the first groove 2133 does not accommodate the adhesive layer.

[0240] The first groove 2133 does not accommodate the adhesive layer, so that the adhesive layer cannot easily prevent the weak portion 2131 from cracking, and the battery monomer 20 can be smoothly relieved, which is beneficial to improving the timeliness of the pressure relief of the battery monomer 20.

[0241] The embodiments of the present application also provide a power consumption device. The power consumption device includes the battery monomer 20 described above, and the battery monomer 20 is used to provide electric energy for the power consumption device.

[0242] The battery monomer 20 provided by the embodiment of the present application comprises an outer shell 21 and a reinforcing part 22, the outer shell 21 comprises a wall part 213, the wall part 213 has a weak part 2131, the weak part 2131 is annular, and the weak part 2131 is configured to be at least partially destroyed when the battery monomer 20 is depressurized. In the thickness direction of the wall part 213, the wall part 213 has a first surface 21311, the reinforcing part 22 is arranged on the first surface 21311, the reinforcing part 22 is annular, and the weak part 2131 is arranged on the outer side of the reinforcing part 22 in a surrounding manner. The first surface 21311 of the wall part 213 in the thickness direction is provided with the reinforcing part 22, the reinforcing part 22 plays a reinforcing role on the wall part 213, improves the anti-deformation capability of the wall part 213, improves the fatigue resistance of the wall part 213, reduces the risk of the wall part 213 being destroyed due to fatigue, makes the wall part 213 have a longer service life, and further improves the service life of the battery monomer 20. In addition, the weak part 2131 and the reinforcing part 22 are both annular, and the weak part 2131 is arranged on the outer side of the reinforcing part 22 in a surrounding manner. On the one hand, the reinforcing part 22 has a relatively close reinforcing effect on each position of the weak part 2131, so that the weak part 2131 is more easily completely destroyed when the battery monomer 20 is depressurized, so that the area of the wall part 213 located on the inner side of the weak part 2131 is easily completely separated from the wall part 213, a larger opening is opened, and the discharge in the battery monomer 20 can quickly depressurize through the opening, which is beneficial to improving the timeliness of the battery monomer 20. On the other hand, when the area of the wall part 213 located on the inner side of the reinforcing part 22 is deformed under stress, the reinforcing part 22 can play a buffering role, reduce the stress conducted to the weak part 2131, and thus reduce the risk of the battery monomer 20 being prematurely opened, which is beneficial to improving the service life and reliability of the battery monomer 20.

[0243] The weak part 2131 and the reinforcing part 22 are both circular annular, and the axis of the weak part 2131 coincides with the axis of the reinforcing part 22. The weak part 2131 and the reinforcing part 22 are both circular annular, and the axis of the weak part 2131 coincides with the axis of the reinforcing part 22. In this way, the weak part 2131 and the reinforcing part 22 are coaxially arranged, so that the reinforcing part 22 has the closest reinforcing effect on each position of the weak part 2131, the stress on each position of the weak part 2131 is more uniform when the battery monomer 20 is depressurized, so that the weak part 2131 is more easily completely destroyed when the battery monomer 20 is depressurized, so that the area of the wall part 213 located on the inner side of the weak part 2131 is more easily completely separated from the wall part 213, a larger opening is opened, and the discharge in the battery monomer 20 can quickly depressurize through the opening, which is beneficial to improving the timeliness of the battery monomer 20.

[0244] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized by, The battery cell includes: a housing including a wall portion having a weak portion, the weak portion being annular, the weak portion being configured to be at least partially destroyed when the battery cell is depressurized, the wall portion having a first surface in a thickness direction of the wall portion; a reinforcing portion provided on the first surface, the reinforcing portion being an annular structure, the weak portion being provided on an outer side of the reinforcing portion.

2. The battery cell of claim 1, wherein, In a direction perpendicular to the thickness direction of the wall portion, a distance between the weak portion and the reinforcing portion is L, and 1 mm ≤ L ≤ 4 mm is satisfied.

3. The battery cell of claim 2, wherein, 2 mm ≤ L ≤ 3 mm.

4. The battery cell of claim 1, wherein, In the direction perpendicular to the thickness direction of the wall portion, the distance between the weak portion and the reinforcing portion is smaller than a distance from the reinforcing portion to a central axis of the weak portion.

5. The battery cell of claim 1, wherein, The weak portion and the reinforcing portion are both circular annular, and a distance between an axis of the weak portion and an axis of the reinforcing portion is less than or equal to 1 mm.

6. The battery cell of claim 5, wherein, The axis of the weak portion and the axis of the reinforcing portion coincide.

7. The battery cell of claim 1, wherein, The wall portion has a second surface provided opposite to the first surface, the wall portion is provided with a first groove, the first groove being annular, the first groove being recessed from the second surface in a direction close to the first surface, and forming the reinforcing portion protruding from the first surface at a position of the wall portion corresponding to the first groove.

8. The battery cell of claim 7, wherein, In the thickness direction of the wall portion, the reinforcing portion has a third surface farthest from the first surface, a distance between a groove bottom surface of the first groove and the third surface is H1, a distance between the first surface and the second surface is H2, and 0.5 ≤ H1 / H2 ≤ 1.5 is satisfied.

9. The battery cell of claim 8, wherein, 0.8 ≤ H1 / H2 ≤ 1.

2.

10. The battery cell of claim 7, wherein, In the thickness direction of the wall portion, a height of the reinforcing portion protruding from the first surface is H3, and a distance between the first surface and the second surface is H2, and 1 / 3 ≤ H3 / H2 ≤ 1 is satisfied.

11. The battery cell of claim 7, wherein the cathode comprises a lithium metal oxide. The wall portion is provided with a second groove, a groove bottom wall of the second groove forms the weak portion. In the thickness direction of the wall portion, the groove bottom surface of the first groove is closer to the first surface than the groove bottom surface of the second groove.

12. The battery cell of claim 7, wherein, The reinforcing portion has a first side wall and a first bottom wall, the first side wall being provided around the first bottom wall, and the first side wall and the first bottom wall together define the first groove. A thickness of the first side wall is H4, and a distance between the first surface and the second surface in the thickness direction of the wall portion is H2, and H4 ≤ H2 is satisfied.

13. The battery cell of claim 12, wherein the cathode comprises a lithium metal oxide. In the thickness direction of the wall portion, a thickness of the first bottom wall is H1, and a distance between the first surface and the second surface is H2, and H1 ≤ H2 is satisfied.

14. The battery cell of any one of claims 1-13, wherein, The wall portion is provided with a second groove, a groove bottom wall of the second groove forms the weak portion.

15. The battery cell of claim 14, wherein the cathode comprises a lithium metal oxide. The second groove is provided on the first surface.

16. The battery cell of any one of claims 1-13, wherein, The first surface faces an inside of the housing.

17. The battery cell according to any one of claims 1-13, characterized in that, The battery cell includes an electrode assembly accommodated in the housing. The wall portion comprises a wall body and an abutting portion, the abutting portion is annularly arranged at the outer edge of the wall body, and protrudes from the wall body in the thickness direction of the wall portion towards the electrode assembly and directly or indirectly abuts against the electrode assembly, and the wall body comprises the weakened portion.

18. The battery cell of claim 17, wherein, The shell comprises a second side wall, the second side wall surrounds the wall portion, and the wall portion is located at one end of the second side wall in the thickness direction of the wall portion. A first flow channel is formed between the electrode assembly and the second side wall, the abutting portion and the wall body jointly define a flow space, the abutting portion is provided with a second flow channel, and the second flow channel communicates the flow space and the first flow channel.

19. The battery cell of claim 18, wherein, The wall portion further comprises an edge portion, the edge portion is annularly arranged at the outer edge of the abutting portion, and the edge portion abuts against one end of the second side wall in the direction of the wall portion towards the electrode assembly.

20. The battery cell of claim 17, wherein, In the thickness direction of the wall portion, the wall body has oppositely arranged fourth and fifth surfaces, the fourth surface faces the electrode assembly, the wall body is provided with a recess, the recess is recessed from the fifth surface in the direction towards the fourth surface, and a protrusion protruding from the fourth surface is formed at the position of the wall body corresponding to the recess, and the surface of the protrusion facing the electrode assembly is the first surface. In the thickness direction of the wall portion, the orthographic projection of the weakened portion is located in the recess.

21. The battery cell of any one of claims 1-13, wherein, The shell comprises a shell body and an end cover, the shell body has an opening, and the end cover closes the opening, and the end cover is the wall portion.

22. The battery cell of any one of claims 1-13, wherein, The battery cell is a cylindrical battery cell, and the thickness direction of the wall portion is parallel to the axial direction of the cylindrical battery cell.

23. A battery device characterized by comprising: The battery device comprises the battery cell according to any one of claims 1-22.

24. The battery device of claim 23, wherein, In the thickness direction of the wall portion, the wall portion has oppositely arranged fourth and fifth surfaces, the fourth surface faces the inside of the shell, the wall portion is provided with a recess, the recess is recessed from the fifth surface in the direction towards the fourth surface, and a protrusion protruding from the fourth surface is formed at the position of the wall portion corresponding to the recess, and the surface of the protrusion facing the inside of the shell is the first surface, and in the thickness direction of the wall portion, the orthographic projection of the weakened portion is located in the recess. The battery device further comprises a box body, the battery cell is accommodated in the box body, and the battery cell is fixed to the box body through an adhesive layer, and the adhesive layer is at least partially accommodated in the recess.

25. The battery device of claim 24, wherein, The wall portion is provided with a first groove, the first groove is annular, the first groove is recessed from the bottom surface of the recess in the direction towards the first surface, and the reinforcing portion protruding from the first surface is formed at the position of the wall portion corresponding to the first groove.

26. The battery device of claim 25, wherein, Part of the adhesive layer is accommodated in the first groove.

27. The battery device of claim 25, wherein, The first groove does not accommodate the adhesive layer.

28. An electrical device, comprising: The battery device comprises the battery cell according to any one of claims 1-22, and the battery cell is used to provide electric energy for the electric device.

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