Battery cells, batteries and power consuming devices

Abstract

The present application provides a battery cell, a battery, and a power consumption device, belonging to the battery technical field. The battery cell includes a housing having a wall, the wall having a first surface and a second surface facing each other along a thickness direction of the wall. A first groove is formed in the first surface, a second groove is formed in the second surface at a position corresponding to the first groove, and a cut groove is formed at a bottom surface of the first groove, so that the wall can be cracked along the cut groove when the battery cell is released from pressure. This battery cell, on the one hand, reduces the depth of the cut groove in the wall, thereby reducing the difficulty of manufacturing the cut groove and the demands on manufacturing equipment, which is advantageous for reducing manufacturing costs. It also reduces the molding force applied to the wall when machining the cut groove, which is advantageous for reducing the risk of cracks in the wall. On the other hand, it improves the shape of the flowable material during the cut groove formation process, which is advantageous for the flow of material generated during the cut groove formation, thereby improving the structural consistency of the cut groove.

Description

[Technical Field]

[0001] Cross-reference to related applications This application claims priority to Chinese Patent Application No. 2023105020852, entitled "Battery Cell, Battery and Power Consumption Device," filed on May 6, 2023, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of battery technology, and more particularly to battery cells, batteries, and power consuming devices. [Background technology]

[0003] With the development of new energy technologies, the applications of batteries are becoming more and more widespread, such as in mobile phones, notebook computers, battery cars, electric cars, electric airplanes, electric steamers, electric toy cars, electric toy steamers, electric toy airplanes and power tools.

[0004] In battery technology, to improve the safety of battery cells, a pressure relief structure is generally installed in the battery cell housing to relieve the internal pressure of the battery cell, so that when the internal pressure or temperature of the battery cell reaches a threshold, the pressure relief structure can tear at the position where the notch is provided to relieve the internal pressure of the battery cell. However, the manufacturing process of the notch is relatively difficult and places relatively high requirements on production equipment, which is disadvantageous to reducing the manufacturing cost of the battery cell. Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments of the present application provide a battery cell, a battery, and a power consuming device that can effectively reduce the manufacturing cost of the battery cell. [Means for solving the problem]

[0006] According to a first aspect, an embodiment of the present application provides a battery cell, the battery cell including a housing, the housing having a wall portion, the wall portion having opposing first and second surfaces along a thickness direction of the wall portion, a first groove provided on the first surface, a second groove provided on the second surface at a position corresponding to the first groove, a notch provided on a bottom surface of the first groove, the wall portion being capable of cracking along the notch when the battery cell is released from pressure.

[0007] In the above technical solution, the battery cell housing has a wall portion, and a first groove and a second groove are respectively provided on the first surface and the second surface of the wall portion that face each other, so that the first groove and the second groove are provided opposite each other along the thickness direction of the wall portion, and the notch groove is provided on the groove bottom surface of the first groove. That is, in the thickness direction of the wall portion, the wall portion first provides a first groove and a second groove respectively on both sides of the area for providing the notch groove, so that the notch groove can be provided on the groove bottom surface of the first groove, thereby making it possible to provide the notch groove after thinning a local area of ​​the wall portion. This structure is adopted. In a battery cell having such a structure, on the one hand, the depth of the cut grooves in the housing wall can be reduced, which reduces the difficulty of manufacturing the cut grooves and the demand for manufacturing equipment, thereby benefiting production costs, and the molding force applied to the wall when the cut grooves are machined can be reduced, which reduces the risk of cracks in the wall and benefits production quality of the battery cell. On the other hand, the shape of the flow-type material during the cut groove formation process can be improved, which is beneficial to the flow of material generated during the cut groove formation and improves the consistency of the cut groove structure. In addition, the structure having first and second grooves on both sides of the wall can reduce the depth of the cut grooves in the housing wall, which reduces the depth and difficulty of drilling the grooves compared to a structure having a single-sided groove. This makes the material displacement during the machining of the first and second grooves on both sides of the wall equal, which alleviates the phenomenon of excessive material displacement during the machining of the single-sided groove, further reducing the difficulty of machining and improving the uniformity of material flow during the machining of the first and second grooves.

[0008] In some embodiments, the kerf comprises a first kerf segment and a second kerf segment, and the first kerf segment and the second kerf segment intersect.

[0009] In the above technical solution, by providing a first notch segment and a second notch segment that intersect the notch, on the one hand, the pressure relief area of ​​the battery cell can be increased and the pressure relief speed of the battery cell can be improved, and on the other hand, the intersection point between the first notch segment and the second notch segment becomes weaker, making it more likely to break and easier to relieve the internal pressure of the battery cell.

[0010] In some embodiments, the groove further includes a third groove segment, the third groove segment and the first groove segment being spaced apart, and the second groove segment connecting the first groove segment and the third groove segment.

[0011] In the above technical solution, the cut groove has a first cut groove segment and a third cut groove segment arranged at an interval, and a second cut groove segment connecting the first cut groove segment and the third cut groove segment, so that the wall portion can be cracked along the first cut groove segment, the second cut groove segment and the third cut groove segment when the battery cell is released from pressure, which is advantageous to further increase the pressure release area of ​​the battery cell and improve the pressure release speed of the battery cell.

[0012] In some embodiments, the connection between the first and second cut groove segments is offset from opposite ends of the first cut groove segment, and the connection between the third and second cut groove segments is offset from opposite ends of the third cut groove segment.

[0013] In the above technical solution, the connection position between the first and second cut groove segments is set to be located between both ends of the first cut groove segment, and the connection position between the third cut groove segment and the second cut groove segment is set to be located between both ends of the third cut groove segment, so that the wall portions are located on both sides of the second cut groove segment, and the two areas located between the first and third cut groove segments can open in an opposite opening manner to relieve pressure in the battery cell when it is being relieved, which is beneficial to further improving the pressure relief effect of the battery cell and effectively increasing the pressure relief speed of the battery cell.

[0014] In some embodiments, the first groove segment and the third groove segment are both perpendicular to the second groove segment.

[0015] In the above technical solution, the first and third cut groove segments are both arranged perpendicular to the second cut groove segment, so that the extension direction of the second cut groove segment is the same as the arrangement direction of the first and third cut groove segments. On the one hand, this improves the regularity of the cut groove shape, reduces the difficulty of processing the cut grooves, and is advantageous for reducing the manufacturing costs of the battery cell. On the other hand, the wall portions are located on both sides of the second cut groove segment, and the two regions located between the first and third cut groove segments can open in opposite directions to facilitate pressure relief of the battery cell when pressure is relieved.

[0016] In some embodiments, the connection between the first and second cut groove segments is located at a midpoint of the first cut groove segment, and / or the connection between the third and second cut groove segments is located at a midpoint of the third cut groove segment.

[0017] In the above technical solution, the connection position between the first and second cut groove segments is set to be located at the midpoint of the first cut groove segment, and / or the connection position between the third cut groove segment and the second cut groove segment is set to be located at the midpoint of the third cut groove segment. This alleviates the problem of the wall portions being located on both sides of the second cut groove segment and the two regions located between the first and third cut groove segments having an excessively large area difference, which is advantageous for achieving an approximation of the force required for the wall portions being located on both sides of the second cut groove segment and the two regions located between the first and third cut groove segments to open oppositely when the battery cell is released, thereby facilitating the release of pressure on the battery cell.

[0018] In some embodiments, the first groove includes a first groove segment, a second groove segment, and a third groove segment, the first groove segment and the third groove segment are spaced apart, the second groove segment connects the first groove segment and the third groove segment, the first notched groove segment is located on a groove bottom surface of the first groove segment, the second notched groove segment is located on a groove bottom surface of the second groove segment, and the third notched groove segment is located on a groove bottom surface of the third groove segment.

[0019] In the above technical solution, the first groove is provided with a first groove segment, a second groove segment, and a third groove segment, and the first groove segment, the second groove segment, and the third groove segment of the cut groove are provided corresponding to the groove bottom surfaces of the first groove segment, the second groove segment, and the third groove segment, respectively, so that the first groove only needs to locally thin the position where the wall portion is to be cut, which is advantageous in reducing the difficulty of processing the first groove and reducing the processing range of the first groove.

[0020] In some embodiments, the first groove further includes a fourth groove segment, the fourth groove segment connecting the first groove segment and the third groove segment, and the fourth groove segment and the second groove segment are spaced apart along the extension direction of the first groove segment.

[0021] In the above technical solution, the first groove further includes a fourth groove segment connected to the first groove segment and the third groove segment, and the fourth groove segment is spaced apart from the second groove segment in the extension direction of the first groove segment, so that when the battery cell is released from pressure, the wall can crack along the first notch groove segment, the second notch groove segment, and the third notch groove segment, and the wall can be inverted around the position of the fourth groove segment as an axis, making it easier to open during pressure release.

[0022] In some embodiments, both ends of the fourth groove segment are connected to one end of the first groove segment and one end of the third groove segment, respectively.

[0023] In the above technical solution, both ends of the fourth groove segment are connected to one end of the first groove segment and one end of the third groove segment, respectively, thereby increasing the area of ​​the region of the wall portion located between the fourth groove segment and the second groove segment, which is advantageous for reducing the difficulty of the region of the wall portion located between the first notched groove segment, the second notched groove segment and the third notched groove segment being turned over around the axis where the fourth groove segment is located, and is advantageous for increasing the pressure relief area of ​​the battery cell.

[0024] In some embodiments, the first groove includes two of the fourth groove segments, and along the extension direction of the first groove segment, the second groove segment is located between the two fourth groove segments.

[0025] In the above technical solution, the first groove has two fourth groove segments, and in the extension direction of the first groove segment, the two fourth groove segments are respectively located on both sides of the second groove segment, so that the wall portions are located on both sides of the second notched groove segment, and the two regions located between the first notched groove segment and the third notched groove segment are reversed around the position of the corresponding fourth groove segment as an axis when opening oppositely, thereby improving the opening oppositely effect and making it easier to open for pressure relief.

[0026] In some embodiments, the second groove includes a fifth groove segment, a sixth groove segment, and a seventh groove segment, the fifth groove segment and the seventh groove segment being spaced apart, and the sixth groove segment connecting the fifth groove segment and the seventh groove segment, wherein, along a thickness direction of the wall portion, the fifth groove segment corresponds to the first groove segment, the sixth groove segment corresponds to the second groove segment, and the seventh groove segment corresponds to the third groove segment.

[0027] In the above technical solution, the second groove is provided with a fifth groove segment, a sixth groove segment, and a seventh groove segment, and the fifth groove segment, the sixth groove segment, and the seventh groove segment are respectively provided to correspond to the first groove segment, the second groove segment, and the third groove segment of the first groove in the thickness direction of the wall portion, so that the first groove and the second groove only need to locally thin both sides of the position where the wall portion is to be cut, which is advantageous in reducing the difficulty of processing the second groove and the processing range of the second groove.

[0028] In some embodiments, the second groove further includes an eighth groove segment, the eighth groove segment connecting the fifth groove segment and the seventh groove segment, and the eighth groove segment and the sixth groove segment being spaced apart along the extension direction of the fifth groove segment.

[0029] In the above technical solution, the second groove further has an eighth groove segment connected to the fifth groove segment and the seventh groove segment, and the eighth groove segment is spaced apart from the sixth groove segment in the extension direction of the fifth groove segment, so that when the battery cell is released from pressure, the wall portion can be cracked along the first notch groove segment, the second notch groove segment and the third notch groove segment, and the region of the wall portion located between the first notch groove segment, the second notch groove segment and the third notch groove segment can be reversed around the position of the eighth groove segment as an axis, making it easier to open when releasing pressure.

[0030] In some embodiments, both ends of the eighth groove segment are connected to one end of the fifth groove segment and one end of the seventh groove segment, respectively.

[0031] In the above technical solution, both ends of the eighth groove segment are connected to one end of the fifth groove segment and one end of the seventh groove segment, respectively, thereby increasing the area of ​​the region of the wall portion located between the eighth groove segment and the sixth groove segment, which is advantageous for reducing the difficulty of inverting the region of the wall portion located between the first notched groove segment, the second notched groove segment and the third notched groove segment around the axis where the eighth groove segment is located, and is advantageous for improving the pressure relief area of ​​the battery cell.

[0032] In some embodiments, the second groove includes two of the eighth groove segments, and along the extension direction of the fifth groove segment, the sixth groove segment is located between the two eighth groove segments.

[0033] In the above technical solution, the second groove has two eighth groove segments, and in the extension direction of the fifth groove segment, the two eighth groove segments are respectively located on both sides of the sixth groove segment, so that the wall portions are located on both sides of the second notched groove segment, and the two regions located between the first notched groove segment and the third notched groove segment are respectively inverted around the position of the corresponding eighth groove segment as an axis when opening oppositely, thereby improving the opening oppositely effect and making it easier to open for pressure relief.

[0034] In some embodiments, the first groove has a groove depth H1 and the second groove has a groove depth H2 along the thickness direction of the wall portion, and 0.2≦H1 / H2≦5 is satisfied.

[0035] In the above technical solution, the groove depth in the thickness direction of the wall portion of the first groove is set to 0.2 to 5 times the groove depth in the thickness direction of the wall portion of the second groove, i.e., the ratio of the groove depth of the first groove to the groove depth of the second groove is within 5 times, thereby alleviating the phenomenon in which the shape of the flow-type material during the formation of the cut groove is relatively poor due to the large deviation between the groove depth of the first groove and the groove depth of the second groove, which is favorable for the flow of material generated when the wall portion forms the cut groove, and thereby further improving the consistency of the cut groove structure.

[0036] In some embodiments, a distance L between the bottom surface of the first groove and the bottom surface of the second groove along the thickness direction of the wall portion satisfies 0.3 mm≦L≦1 mm.

[0037] In the above technical proposal, the distance in the thickness direction of the wall portion between the groove bottom surface of the first groove and the groove bottom surface of the second groove is set to 0.3 mm to 1 mm, i.e., the thickness of the wall portion at the position for forming the cut groove after forming the first groove and the second groove is 0.3 mm to 1 mm, which on the one hand alleviates the phenomenon of insufficient strength at the position for forming the cut groove on the wall due to the thickness being too small, and reduces the risk of the wall portion breaking during the process of forming the cut groove, and on the other hand alleviates the phenomenon of the thickness being too large, which makes it too difficult to process the cut groove and results in a relatively poor shape of the fluid material during the process of forming the cut groove, thereby improving the processing quality of the cut groove.

[0038] In some embodiments, the first groove has a groove width W1 that satisfies 0.5 mm≦W1≦10 mm, and / or the second groove has a groove width W2 that satisfies 0.5 mm≦W2≦10 mm.

[0039] In the above technical solution, by setting the groove width of the first groove to 0.5 mm to 10 mm, on the one hand, it is possible to alleviate the phenomenon where the area for the cut groove on the bottom surface of the first groove is too small due to the groove width being too small, thereby increasing the width of the area for the cut groove, and further allowing the area of ​​the wall where the first groove is provided to play the role of deformation buffering when the battery cell is subjected to impact, thereby reducing damage to the cut groove location and making it easier for the material to flow when machining the cut groove, thereby improving the conformity of the cut groove; on the other hand, it is possible to alleviate the phenomenon where the groove width of the first groove is too large, resulting in an excessively large machining area and a decrease in the strength of the overall structure of the wall. Similarly, by setting the groove width of the second groove to 0.5 mm to 10 mm, on the one hand, it is possible to alleviate the phenomenon where the area where the cut groove is provided on the bottom surface of the second groove corresponding to the first groove is too small due to the groove width of the second groove being too small, thereby increasing the width of the area for providing the cut groove, and further allowing the area where the second groove is provided on the wall to play the role of absorbing deformation when the battery cell is subjected to impact, thereby reducing damage to the cut groove location and making it easier for the material to flow when machining the cut groove, thereby improving the conformity of the cut groove; on the other hand, it is possible to alleviate the phenomenon where the groove width of the second groove is too large, resulting in an excessively large machining area and a decrease in the strength of the overall structure of the wall.

[0040] In some embodiments, the first groove is a stepped groove provided along the thickness direction of the wall portion, and / or the second groove is a stepped groove provided along the thickness direction of the wall portion.

[0041] In the above technical solution, by setting the first groove to a stepped groove structure, the first groove is machined multiple times, which can reduce the depth of the first groove machined in one go, thereby reducing the difficulty of machining and the forming force that the wall portion receives when machining the first groove, which is advantageous to reducing the risk of cracks occurring in the wall portion.Similarly, by setting the second groove to a stepped groove structure, the second groove is machined multiple times, which can reduce the depth of the second groove machined in one go, thereby reducing the difficulty of machining and the forming force that the wall portion receives when machining the second groove, which is advantageous to reducing the risk of cracks occurring in the wall portion.

[0042] In some embodiments, along the thickness of the wall, the first surface is spaced apart from the interior of the housing.

[0043] In the above technical solution, the first surface is a surface facing away from the interior of the wall housing, so that the notch is provided on one side facing away from the interior of the wall housing, which is advantageous in reducing the difficulty of processing the notch, and thereby facilitating processing the notch in the wall.

[0044] In some embodiments, a recessed groove is provided along the thickness direction of the wall portion on one side of the wall portion facing away from the interior of the housing, and the two surfaces facing the groove bottom wall of the recessed groove are the first surface and the second surface, respectively.

[0045] In the above technical solution, a sunken groove is provided on one side of the wall portion facing away from the inside of the housing, and the two opposing surfaces in the thickness direction of the wall portion of the groove bottom wall of the sunken groove are respectively the first surface and the second surface, i.e., the first groove and the second groove are respectively provided on both sides in the thickness direction of the wall portion of the groove bottom wall of the sunken groove, so that the sunken groove can provide a certain protective effect for the area of ​​the wall portion where the cut groove is provided, thereby reducing the phenomenon of wear or damage to the area of ​​the wall portion where the cut groove is provided due to the influence of the external environment, and further advantageously improving the service life of the battery cell.

[0046] In some embodiments, a protrusion is formed along the thickness direction of the wall portion, facing one side of the interior of the housing, at a position corresponding to the recess.

[0047] In the above technical proposal, a convex portion is formed on one side of the wall portion away from the sunken groove and at a position corresponding to the sunken groove, making the sunken groove of the wall portion a concave-convex structure formed by pressing, thereby allowing a sunken groove and a convex portion to be formed on both sides of the wall portion. A wall portion adopting such a structure is easy to manufacture and reduces the difficulty of processing the sunken groove, which is advantageous for improving the processing efficiency of the sunken groove. On the other hand, it can effectively improve the structural strength of the groove bottom wall of the sunken groove, thereby reducing the risk of deformation or breakage when forming the first groove and the second groove on both sides of the groove bottom wall of the sunken groove, which is advantageous for improving the production quality of battery cells.

[0048] In some embodiments, the housing includes a case and an end cap, wherein a receiving cavity having an opening is formed inside the case, the receiving cavity is used to receive an electrode assembly, and the end cap seals the opening, wherein the end cap is the wall portion.

[0049] In the above technical solution, the wall of the housing is an end cap that seals the opening of the case, and a battery cell using this structure is advantageous in that it has a first groove and a second groove on the end cap, and it is easy to form a notch on the bottom surface of the first groove, which effectively reduces the processing difficulty of forming the first groove, the second groove and the notch on the battery cell housing, and improves the production efficiency of the battery cell.

[0050] In some embodiments, the housing includes a case and an end cap, the case including an integrally molded side wall and the wall portion, the side wall being circumferentially disposed around the wall portion, one end of the side wall being connected to the wall portion along a thickness direction of the wall portion and the other end being surrounding and forming an opening, the side wall and the wall portion together defining a receiving cavity for receiving an electrode assembly, and the end cap sealing the opening.

[0051] In the above technical solution, the wall is a single wall where the case is installed facing the end cap in the thickness direction of the wall. A battery cell using this structure can distance the area where the housing's cutout grooves are provided from the end cap, and there is no direct connection between the wall and the end cap. This reduces the impact on the cutouts of stress generated when the end cap and the case are connected to each other, reducing the phenomenon of cracks occurring at the positions where the wall's cutout grooves are provided or a decrease in structural strength. It also effectively reduces the situation where the battery cell prematurely opens to release pressure, thereby improving the usage stability and service life of the battery cell.

[0052] According to a second aspect, an embodiment of the present application further provides a battery including the battery cell described above.

[0053] According to a third aspect, embodiments of the present application further provide a power consuming device including the battery described above. [Brief explanation of the drawings]

[0054] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the embodiments. It should be understood that the following drawings only illustrate some embodiments of the present application, and should not be considered as limiting the scope. Those skilled in the art can also derive other related drawings based on these drawings without exerting any creative efforts. [Figure 1] 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application. [Figure 2] 1 is an exploded view of a battery according to some embodiments of the present application. FIG. [Figure 3] FIG. 2 is an exploded structural view of a battery cell according to some embodiments of the present application. [Figure 4] 1 is a top cross-sectional view of a wall of a housing according to some embodiments of the present application. [Figure 5] 5 is a local enlarged view of a portion A of the wall portion shown in FIG. 4. [Figure 6] 1 is a schematic diagram of a topographical structure facing a first surface of a wall of a housing according to some embodiments of the present application. [Figure 7] 10A-10C are schematic diagrams of local structures facing a second surface of a wall of a housing according to some embodiments of the present application. [Figure 8] 10A and 10B are structural schematic diagrams of the wall of a housing according to some other embodiments of the present application. [Figure 9] 10A-10C are schematic diagrams of local structures facing a first surface of a wall of a housing according to some other embodiments of the present application. [Figure 10] 10A-10C are structural schematic diagrams of walls of a housing according to further some embodiments of the present application. [Figure 11] 10A-10C are schematic diagrams of local structures facing a second surface of a wall of a housing according to further some embodiments of the present application. [Figure 12] 10A and 10B are structural schematic diagrams of the wall of a housing according to some other embodiments of the present application. [Figure 13] 10A-10C are local cross-sectional views of a wall of a housing according to some other embodiments of the present application. [Figure 14]14 is a local enlarged view of a portion B of the wall of the housing shown in FIG. 13. DETAILED DESCRIPTION OF THE INVENTION

[0055] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the following will clearly describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without any creative efforts fall within the scope of protection of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art of this application, and the terms used in the specification of this application are only for describing specific embodiments and are not intended to limit this application, and the terms "comprises," "has," and any variations thereof in the specification and claims of this application and the above drawings are intended to cover a non-exclusive "comprise." The terms "first," "second," etc. in the specification and claims of this application or the above drawings are not intended to describe a specific order or a hierarchical relationship, but are intended to distinguish different objects.

[0057] An "embodiment" referred to in this application means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of this phrase in various places in the specification do not necessarily all refer to the same embodiment, nor are they mutually exclusive, separate, or alternative embodiments of other embodiments.

[0058] In the description of this application, it should be explained that unless otherwise clearly defined or limited, the terms "attached," "connected," "joined," and "attached" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in this application according to specific circumstances.

[0059] The term "and / or" in this application merely describes the relationship between related objects and indicates that three relationships may exist, for example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. Also, the character " / " in this application generally indicates that the related objects before and after are in an "or" relationship.

[0060] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments will be omitted. It should be understood that the dimensions such as thickness, aspect, etc. of various components in the embodiments of the present application shown in the drawings, and the dimensions such as thickness, aspect, etc. of the entire integrated device are for illustrative purposes only and do not constitute any limitations on the present application.

[0061] The term "plurality" as used herein refers to two or more (including two).

[0062] In the embodiment of the present application, the battery cell may be a secondary battery, which is a battery cell that can be continuously used by activating the active material in a charging manner after discharging the battery cell.

[0063] The battery cells may be lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel metal hydride batteries, nickel cadmium batteries, lead acid batteries, etc., and the embodiments of the present application are not limited thereto.

[0064] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator member. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are absorbed and released by oscillating between the positive electrode and the negative electrode. The separator member, located between the positive electrode and the negative electrode, prevents short-circuiting between the positive and negative electrodes while allowing the active ions to pass through.

[0065] In some embodiments, the positive electrode may be a positive plate, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0066] For example, a positive electrode current collector has two surfaces that face each other in the thickness direction of the positive electrode current collector, and a positive electrode active material is disposed on one or both of the two facing surfaces of the positive electrode current collector.

[0067] For example, the positive electrode current collector may be a metal foil sheet or a composite current collector. For example, the metal foil sheet may be silver-surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0068] For example, the positive electrode active material may include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may also be used. These positive electrode active materials may be used alone or in combination of two or more. Here, examples of the lithium-containing phosphate may include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (also abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0069] In some examples, the negative electrode may be a negative electrode plate, and the negative electrode plate may include a negative electrode current collector.

[0070] For example, the negative electrode current collector may be a metal foil sheet, a metal foam, or a composite current collector. For example, the metal foil sheet may be silver-surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymeric material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0071] For example, the negative electrode plate may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0072] For example, the negative electrode current collector has two surfaces that face each other in the thickness direction of the negative electrode current collector, and the negative electrode active material is disposed on either one or both of the two facing surfaces of the negative electrode current collector.

[0073] For example, the negative electrode active material may be any negative electrode active material known in the art for use in battery cells, and may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicone-based material, a tin-based material, and lithium titanate.

[0074] In some examples, the material of the positive electrode current collector may be aluminum and the material of the negative electrode current collector may be copper.

[0075] In some embodiments, the electrode assembly further includes a separator member disposed between the positive electrode and the negative electrode.

[0076] In some embodiments, the separator member is a separator. There may be multiple types of separators, and any known porous separator with good chemical stability and mechanical stability may be selected.

[0077] For example, the main material of the separator may be at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0078] In some embodiments, the separator member is a solid electrolyte that is disposed between the positive and negative electrodes and simultaneously functions to transport ions and separate the positive and negative electrodes.

[0079] In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive electrode and the negative electrode. The present application does not specifically limit the type of electrolyte, and the electrolyte can be selected according to needs. The electrolyte may be liquid, gel, or solid.

[0080] In some embodiments, the electrode assembly is a wound structure, and the positive and negative electrode plates are wound into the wound structure.

[0081] In some embodiments, the electrode assembly is a laminate structure.

[0082] In some embodiments, the electrode assembly may have a cylindrical, flattened, or polygonal prism shape, or the like.

[0083] In some embodiments, the electrode assembly is provided with tabs through which current can be drawn from the electrode assembly, including a positive electrode tab and a negative electrode tab.

[0084] In some embodiments, the battery cell may include a housing. The housing may be used to package components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), an aluminum-plastic film, or the like.

[0085] For example, the battery cells may be cylindrical battery cells, prismatic battery cells, pouch battery cells, or other shaped battery cells, where prismatic battery cells include, but are not limited to, rectangular battery cells, blade-shaped battery cells, and polygonal prismatic batteries, and polygonal prismatic batteries include, for example, hexagonal prismatic batteries.

[0086] The battery referred to in the examples of this application refers to a single physical module containing one or more battery cells to provide higher voltage and capacity.

[0087] In some embodiments, the battery may be a battery module, and if there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0088] In some embodiments, the battery may be a battery pack, which includes a housing and battery cells, with the battery cells or modules housed within the housing.

[0089] In some embodiments, the housing may be part of a chassis structure of a vehicle, for example, a portion of the housing may be at least a portion of a floor of the vehicle, or a portion of the housing may be at least a portion of a cross member and a side member of the vehicle.

[0090] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage electrical cabinet, or the like.

[0091] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide application range, low self-discharge coefficient, etc., and are currently an important component of the development of new energy. With the rapid development and increasing demand for batteries, the demands for battery manufacturing costs and production quality are also increasing accordingly.

[0092] For a typical battery cell, a pressure relief structure is generally installed in the battery cell housing, and the pressure relief structure can break when the internal pressure or temperature of the battery cell reaches a threshold, thereby relieving the internal pressure of the battery cell, which is advantageous to improving the safety of the battery cell. In the related art, in order to improve the structural strength and stability of the pressure relief structure installed in the housing, the pressure relief structure is generally formed in the housing using an integral molding process, such as a pressing process, by forming a cut groove in the housing to form the pressure relief structure in the housing. However, because the wall thickness of the housing is relatively thick, on the one hand, the depth of the cut grooves is relatively deep, making it relatively difficult to manufacture the cut grooves and placing relatively high demands on manufacturing equipment, which is disadvantageous for reducing the manufacturing costs of the battery cells. In addition, the forming force required in the process of forming the cut grooves is relatively large, which makes it very likely that cracks will occur in the wall at the positions where the cut grooves are formed, which is disadvantageous for improving the production quality of the battery cells. On the other hand, the shape of the flow-type material generated in the process of forming the cut grooves in the battery cell housing is relatively poor, which is disadvantageous for the flow of the material generated when forming the cut grooves and therefore relatively poor consistency of the cut groove structure.

[0093] In consideration of the above, in order to solve the problems of relatively high manufacturing costs and poor production quality of battery cells, an embodiment of the present application provides a battery cell, the battery cell including a housing, the housing having a wall, the wall having a first surface and a second surface opposite each other along a thickness direction of the wall, wherein a first groove is formed in the first surface, a second groove is formed in the second surface at a position corresponding to the first groove, and a notch is formed in the bottom surface of the first groove, so that the wall can be cracked along the notch when the battery cell is released from pressure.

[0094] In a battery cell with this structure, the battery cell housing has a wall portion, and a first groove and a second groove are provided on the first and second surfaces of the wall portion that face each other, so that the first groove and the second groove are provided opposite each other along the thickness direction of the wall portion, and a notched groove is provided on the groove bottom surface of the first groove. In other words, by first providing the first groove and the second groove, respectively, on both sides of the area for providing the notched groove in the thickness direction of the wall portion, the notched groove can be provided on the groove bottom surface of the first groove, thereby making it possible to provide the notched groove after thinning the local area of ​​the wall portion. A battery cell employing such a structure can, on the one hand, reduce the depth of the cut grooves in the housing wall, thereby reducing the difficulty of manufacturing the cut grooves and the demands on manufacturing equipment, and thus benefiting in reducing manufacturing costs. It can also reduce the molding force that the wall receives when processing the cut grooves, thereby reducing the risk of cracks occurring in the wall, and thus benefiting in improving the production quality of the battery cell. On the other hand, it can improve the shape of the flowable material during the cut groove formation process, which is beneficial to the flow of material generated when forming the cut grooves, thereby improving the consistency of the cut groove structure.

[0095] In addition, by providing a first groove and a second groove on both sides of the wall, the depth of the cut groove in the housing wall can be reduced, and the depth and difficulty of drilling the groove can be reduced compared to a structure in which a groove is drilled on one side. This makes the material displacement during the process of drilling the first groove and the second groove on both sides of the wall the same, mitigating the phenomenon of excessive material displacement during the process of drilling a groove on one side of the wall, further reducing the difficulty of drilling, and improving the uniformity of material flow during the drilling of the first groove and the second groove.

[0096] The battery cells disclosed in the embodiments of the present application can be used in power consumption devices such as, but not limited to, vehicles, ships, and aircraft, and can also be used in energy storage devices. A power supply system that includes the battery cells and batteries disclosed in the present application and configures the power consumption device can be used, which alleviates the relatively high manufacturing difficulty of forming cut grooves in the battery cell housing and is advantageous in reducing the manufacturing cost of the battery cells.

[0097] An embodiment of the present application provides a power-consuming device that uses a battery as a power source, and the power-consuming device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a steamship, a spacecraft, etc. Here, the electric toy may include a stationary or mobile electric toy, such as a game console, an electric car toy, an electric steamship toy, and an electric plane toy, and the spacecraft may include an airplane, a rocket, a spacecraft, a spaceship, etc.

[0098] For convenience of explanation, the following embodiment will be described by taking an example in which the power consumption device of one embodiment of the present application is a vehicle 1000.

[0099] As shown in FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a gasoline-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extender vehicle, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 may be installed at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000, for example, as an operating power source or a power source for use by the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 1000 to supply power to the motor 300, for example, for starting the vehicle 1000, navigation, and driving power consumption needs.

[0100] In some embodiments of the present application, the battery 100 can not only be the operating or use power source for the vehicle 1000, but can also be the driving power source for the vehicle 1000, providing driving power to the vehicle 1000 in place of or in place of fuel oil or natural gas.

[0101] As shown in Fig. 2, Fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 may include a housing 10 and a battery cell 20, and the battery cell 20 is adapted to be housed in the housing 10.

[0102] Here, the housing 10 is used to provide an assembly space for the battery cells 20, and the housing 10 may have various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which are fitted over each other and jointly define an assembly space for accommodating the battery cells 20. The second housing body 12 may have a hollow structure with one end open, or the first housing body 11 may have a plate-like structure and the first housing body 11 is fitted over the open side of the second housing body 12, thereby jointly defining the assembly space. In other embodiments, the first housing body 11 and the second housing body 12 may both have a hollow structure with one end open, and the open side of the first housing body 11 is fitted over the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 may have various shapes, for example, a cylinder, a rectangular parallelepiped, etc. Illustratively, in FIG. 2, the shape of the housing 10 is a rectangular parallelepiped.

[0103] Alternatively, the battery 100 may contain one or more battery cells 20 housed within the housing 10. When the housing 10 contains multiple battery cells 20, the multiple battery cells 20 may be connected in series, parallel, or series-parallel, and a series-parallel connection refers to both a series connection and a parallel connection among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, parallel, or series-parallel, and an entire module consisting of the multiple battery cells 20 may be housed within the housing 10. Of course, in some embodiments, the battery 100 may be formed by first connecting the multiple battery cells 20 in series, parallel, or series-parallel to form a battery module, and then connecting the multiple battery modules in series, parallel, or series-parallel to form an integrated battery module housed within the housing 10.

[0104] In some embodiments, the battery 100 may further include other structures, for example, the battery 100 may further include bus bar members disposed within the housing 10, the bus bar members being connected to the plurality of battery cells 20 to realize electrical connection between the plurality of battery cells 20.

[0105] Here, each battery cell 20 may be a secondary battery or a primary battery, and may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cells 20 may be cylindrical, flat, rectangular, or have other shapes. Illustratively, in FIG. 2, the battery cells 20 have a rectangular parallelepiped structure.

[0106] According to some embodiments of the present application, as shown in Figures 3, 4, and 5, Figure 3 is an exploded structural view of a battery cell 20 according to some embodiments of the present application, Figure 4 is a local cross-sectional view of a wall 211 of a housing 21 according to some embodiments of the present application, and Figure 5 is a local enlarged view of a portion A of the wall 211 of the housing 21 shown in Figure 4. The present application provides a battery cell 20, the battery cell 20 including a housing 21, the housing 21 having a wall 211, the wall 211 having a first surface 2111 and a second surface 2112 facing each other along a thickness direction X of the wall. A first groove 2113 is formed in the first surface 2111, a second groove 2114 is formed in the second surface 2112 at a position corresponding to the first groove 2113, and a notch 2115 is formed in a bottom surface of the first groove 2113, and the wall 211 can be cracked along the notch 2115 when the battery cell 20 is released from pressure.

[0107] Here, the wall portion 211 has opposing first and second surfaces 2111 and 2112, i.e., the first and second surfaces 2111 and 2112 of the wall portion 211 face the inside and outside of the housing 21, respectively, in the thickness direction X of the wall portion, and of course, the first surface 2111 may be installed facing the inside of the housing 21 or may be installed away from the inside of the housing 21.

[0108] A first groove 2113 is provided in the first surface 2111, and a cut groove 2115 is provided on the bottom surface of the first groove 2113. The first surface 2111 may be the surface of the wall portion 211 facing the inside of the housing 21, or may be the surface of the wall portion 211 facing away from the inside of the housing 21; that is, the cut groove 2115 may be provided facing the inside of the housing 21, or may be provided in a position facing away from the inside of the housing 21.

[0109] In an embodiment in which a notched groove 2115 is provided on the bottom surface of the first groove 2113, that is, the first groove 2113 is first formed on the first surface 2111, and then the notched groove 2115 is formed on the bottom surface of the first groove 2113, so that the first groove 2113 and the notched groove 2115 are arranged along the thickness direction X of the wall portion, and the second groove 2114 is provided on the second surface 2112 at a position corresponding to the first groove 2113 along the thickness direction X of the wall portion, the first groove 2113, the notched groove 2115 and the second groove 2114 are arranged in order along the thickness direction X of the wall portion.

[0110] It should be noted that the first groove 2113, the second groove 2114 and the notched groove 2115 are all provided in the wall portion 211, that is, the members for relieving the internal pressure of the battery cell 20 in the housing 21 of the battery cell 20 are integrally molded with the housing 21.

[0111] Optionally, the shape of the notched groove 2115 provided on the groove bottom surface of the first groove 2113 may be various, for example, the notched groove 2115 may have a strip-like structure, an arc-like structure, a "C"-shaped structure, an "S"-shaped structure, a "V"-shaped structure, a "Z"-shaped structure, an "X"-shaped structure, an "H"-shaped structure, etc. Exemplarily, in FIG. 3 , the notched groove 2115 has an "H" shape.

[0112] Alternatively, the first groove 2113 and the second groove 2114 formed on opposite sides of the wall portion 211 may have a variety of structures. For example, the first groove 2113 and the second groove 2114 may be relatively large grooves formed on the first surface 2111 and the second surface 2112, respectively. The side surfaces of the first groove 2113 and the entire side surfaces of the second groove 2114 both surround the outside of the cut groove 2115, and may be, for example, rectangular, circular, or elliptical grooves. Of course, the first groove 2113 and the second groove 2114 may also be grooves whose shape is at least partially the same as that of the cut groove 2115. 6 and 7, Fig. 6 is a schematic diagram of a local structure in which the wall 211 of the housing 21 according to some embodiments of the present application faces a first surface 2111, and Fig. 7 is a schematic diagram of a local structure in which the wall 211 of the housing 21 according to some embodiments of the present application faces a second surface 2112. At least a portion of the first groove 2113 and at least a portion of the second groove 2114 both have the same structure as the shape of the cut groove 2115, and exemplarily, the cut groove 2115 is "H" shaped, and the positions where the cut groove 2115 is provided corresponding to the first groove 2113 and the second groove 2114 are also "H" shaped.

[0113] In some embodiments, as shown in FIG. 3 , the battery cell 20 may further include an electrode assembly 22. The electrode assembly 22 is accommodated in the housing 21. The electrode assembly 22 is a component in which an electrochemical reaction occurs in the battery cell 20. The electrode assembly 22 may have a variety of structures. For example, the electrode assembly 22 may have a wound structure formed by winding a positive electrode plate, a separator member, and a negative electrode plate, or a stacked structure formed by stacking a positive electrode plate, a separator member, and a negative electrode plate.

[0114] For example, the separator member may be a separator, and the main material of the separator may be at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0115] Alternatively, the number of electrode assemblies 22 housed in the housing 21 may be one or more. For example, in Fig. 3, two electrode assemblies 22 are installed in the housing 21 of the battery cell 20, and the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the number of electrode assemblies 22 housed in the housing 21 may be one, three, four, five, six, seven, or eight, etc.

[0116] Here, the housing 21 can also be used to contain an electrolyte, such as an electrolytic solution. The housing 21 may have various structural shapes, such as a cylinder or a rectangular parallelepiped. Similarly, the material of the housing 21 may be various, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0117] In some embodiments, the housing 21 may include a case 212 and an end cap 213, where an accommodating cavity is formed inside the case 212, the accommodating cavity is used to accommodate the electrode assembly 22, and the accommodating cavity has an opening 2121, that is, the case 212 is a hollow structure with the opening 2121 at one end, and the end cap 213 is fitted over the opening 2121 of the case 212 to form a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0118] It should be noted that the wall portion 211 for providing the first groove 2113, the second groove 2114, and the notched groove 2115 may be the end cap 213 of the housing 21, or may be one wall of the case 212 of the housing 21. For example, in FIG. 3 , the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited thereto, and in other embodiments, the wall portion 211 may be a bottom wall where the case 212 and the end cap 213 are installed opposite each other, or may be a side wall where the case 212 and the end cap 213 are adjacent and abut against each other.

[0119] When assembling the battery cell 20, the electrode assembly 22 may be first placed in the case 212, and the case 212 may be filled with an electrolyte. Then, the end cap 213 may be placed over the opening 2121 of the case 212 to complete the assembly of the battery cell 20.

[0120] The case 212 may have various shapes, such as a cylinder, a rectangular parallelepiped, or a prismatic structure. The shape of the case 212 may be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, a cylindrical case 212 may be selected, and if the electrode assembly 22 has a rectangular parallelepiped structure, a rectangular case 212 may be selected. Of course, the end cap 213 may have a variety of structures. For example, the end cap 213 may have a plate-like structure or a hollow structure with one end open. For example, in FIG. 3, the case 212 has a rectangular parallelepiped structure.

[0121] Of course, it can be understood that the housing 21 is not limited to the above structure and may have other structures, for example, it may include a case 212 and two end caps 213. The case 212 is a hollow structure with openings 2121 on opposite sides, and one end cap 213 is fitted over one opening 2121 of the case 212 to form a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 22 and the electrolyte; that is, the case 212 has openings 2121 on both opposite sides, and the two end caps 213 are fitted over both sides of the case 212 to seal the corresponding openings 2121.

[0122] In some embodiments, the battery cell 20 may further include an electrode terminal 23, which is insulatedly attached to the housing 21 and electrically connected to the electrode assembly 22 to output or input electrical energy to the battery cell 20.

[0123] It should be noted that the electrode terminal 23 is insulatedly attached to the housing 21, that is, no electrical connection is made between the electrode terminal 23 and the housing 21.

[0124] 3 , the battery cell 20 includes two electrode terminals 23. Accordingly, each electrode assembly 22 has two tabs 221. The polarities of the two tabs 221 are opposite. The two electrode terminals 23 are electrically connected to the two tabs 221 of the electrode assembly 22, respectively, to realize the input or output of the positive and negative electrodes of the battery cell 20. It should be noted that the tabs 221 of the electrode assembly 22 are formed by stacking and connecting regions of positive electrode plates where no positive electrode active material layer is applied, or by stacking and connecting regions of negative electrode plates where no negative electrode active material layer is applied. When the tabs 221 are used to output the positive electrode of the electrode assembly 22, the tabs 221 are formed by stacking and connecting regions of positive electrode plates where no positive electrode active material layer is applied. When the tabs 221 are used to output the negative electrode of the electrode assembly 22, the tabs 221 are formed by stacking and connecting regions of negative electrode plates where no negative electrode active material layer is applied.

[0125] For example, the electrode terminals 23 may be made of a variety of materials, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0126] 3, the two electrode terminals 23 are both attached to the end cap 213 of the housing 21. Of course, the structure of the battery cell 20 is not limited to this, and in other embodiments, the two electrode terminals 23 may both be attached to the case 212 of the housing 21. Similarly, one electrode terminal 23 may be attached to the case 212 of the housing 21 and the other electrode terminal 23 may be attached to the end cap 213 of the housing 21.

[0127] The housing 21 of the battery cell 20 has a wall 211, and by providing a first groove 2113 and a second groove 2114 on a first surface 2111 and a second surface 2112 that face each other of the wall 211, the first groove 2113 and the second groove 2114 are provided opposite each other along the thickness direction X of the wall, and the notched groove 2115 is provided on the groove bottom surface of the first groove 2113. In other words, by first providing the first groove 2113 and the second groove 2114 on both sides of the area in the thickness direction X of the wall 211 where the notched groove 2115 is to be provided, the notched groove 2115 can be provided on the groove bottom surface of the first groove 2113, and thereby the notched groove 2115 can be provided after the wall 211 has been locally thinned. A battery cell 20 employing such a structure can, on the one hand, reduce the depth of the cut grooves 2115 in the wall 211 of the housing 21, thereby reducing the difficulty of manufacturing the cut grooves 2115 and the demands on manufacturing equipment, and thus advantageous to reducing manufacturing costs. It can also reduce the molding force that the wall 211 receives when processing the cut grooves 2115, thereby reducing the risk of cracks occurring in the wall 211 and advantageous to improving the production quality of the battery cell 20. On the other hand, it can improve the shape of the flowable material during the process of forming the cut grooves 2115, which is advantageous to the flow of material generated when forming the cut grooves 2115, thereby improving the structural consistency of the cut grooves 2115. In addition, by providing the first groove 2113 and the second groove 2114 on both sides of the wall 211, the depth of the cut groove 2115 in the wall 211 of the housing 21 can be reduced, and the depth and difficulty of drilling the groove can be reduced compared to a structure in which a groove is drilled on one side. As a result, the material displacement during the process of drilling the first groove 2113 and the second groove 2114 on both sides of the wall 211 is made the same, which alleviates the phenomenon of excessive material displacement during the process of drilling a groove on one side of the wall 211, further reducing the difficulty of drilling, and improving the uniformity of the material flow during the drilling of the first groove 2113 and the second groove 2114.

[0128] According to some embodiments of the present application, as shown in FIGS. 3 and 6, the groove 2115 includes a first groove segment 2115a and a second groove segment 2115b, and the first groove segment 2115a and the second groove segment 2115b intersect.

[0129] Here, the first and second cut groove segments 2115a and 2115b have an intersecting structure, and the first and second cut groove segments 2115a and 2115b may be intersecting structures, such as a "V" structure, a "T" structure, or an "X" structure. Illustratively, in FIG. 6, the first and second cut groove segments 2115a and 2115b are perpendicular to each other and form a "T" structure.

[0130] By providing the first groove segment 2115a and the second groove segment 2115b that intersect the groove 2115, on the one hand, the pressure relief area of ​​the battery cell 20 can be increased, improving the pressure relief speed of the battery cell 20; on the other hand, the intersection point between the first groove segment 2115a and the second groove segment 2115b can be made weaker, making it easier for the internal pressure of the battery cell 20 to crack and be relieved.

[0131] According to some embodiments of the present application, as shown in FIGS. 3 and 6, the cut groove 2115 may further include a third cut groove segment 2115c, the third cut groove segment 2115c and the first cut groove segment 2115a are spaced apart, and the second cut groove segment 2115b connects the first cut groove segment 2115a and the third cut groove segment 2115c.

[0132] Here, the first groove segment 2115a and the third groove segment 2115c are spaced apart, and the second groove segment 2115b connects the first groove segment 2115a and the third groove segment 2115c, i.e., the second groove segment 2115b is located between the first groove segment 2115a and the third groove segment 2115c, and both ends of the second groove segment 2115b are connected to the first groove segment 2115a and the third groove segment 2115c, respectively; of course, the second groove segment 2115b may extend from the first groove segment 2115a and the third groove segment 2115c in its extension direction.

[0133] The second groove segment 2115b connects the first groove segment 2115a and the third groove segment 2115c, such that the first groove segment 2115a, the second groove segment 2115b, and the third groove segment 2115c can form at least one open area 2116 on the wall 211, the first groove segment 2115a, the second groove segment 2115b, and the third groove segment 2115c being disposed along edges of the open area 2116, and the open area 2116 is formed by the first groove segment 2115a, the second groove segment 2115b, and the third groove segment 2115c. In other words, the wall portion 211 forms an open area 2116 within an area surrounded by the first cut groove segment 2115a, the second cut groove segment 2115b, and the third cut groove segment 2115c, so that the portion of the wall portion 211 located in the open area 2116 can open using the first cut groove segment 2115a, the second cut groove segment 2115b, and the third cut groove segment 2115c as boundaries when the pressure in the battery cell 20 is released, thereby releasing the internal pressure of the battery cell 20.

[0134] Alternatively, the shape of the notch 2115 formed by the first notch segment 2115a, the second notch segment 2115b and the third notch segment 2115c together may be a "C"-shaped structure, thereby forming one open area 2116 in the wall portion 211; of course, the shape of the notch 2115 formed by the first notch segment 2115a, the second notch segment 2115b and the third notch segment 2115c together may be a "Z"-shaped structure or an "H"-shaped structure, thereby forming two open areas 2116 in the wall portion 211, and the two open areas 2116 are located on either side of the second notch segment 2115b, respectively. For example, in FIG. 6, the shape of the notch 2115 formed by the first notch segment 2115a, the second notch segment 2115b, and the third notch segment 2115c together is an "H"-shaped structure, thereby forming one open area 2116 on each side of the second notch segment 2115b.

[0135] It should be noted that the groove depth of the first groove segment 2115a, the groove depth of the second groove segment 2115b, and the groove depth of the third groove segment 2115c may all be the same, may not all be the same, or may even be the same in pairs; similarly, the groove width of the first groove segment 2115a, the groove width of the second groove segment 2115b, and the groove width of the third groove segment 2115c may all be the same, may not all be the same, or may even be the same in pairs. For example, in FIG. 6, the groove depth of the first groove segment 2115a, the groove depth of the second groove segment 2115b, and the groove depth of the third groove segment 2115c are all the same, and the groove width of the first groove segment 2115a, the groove width of the second groove segment 2115b, and the groove width of the third groove segment 2115c are all the same, which is advantageous in reducing the requirements for processing equipment and making the processing difficulty of the grooves 2115 easier.

[0136] The cut groove 2115 has a first cut groove segment 2115a and a third cut groove segment 2115c arranged at an interval, and a second cut groove segment 2115b connecting the first cut groove segment 2115a and the third cut groove segment 2115c, so that the wall portion 211 can be cracked along the first cut groove segment 2115a, the second cut groove segment 2115b and the third cut groove segment 2115c when the battery cell 20 is released from pressure, which is advantageous to further increase the pressure release area of ​​the battery cell 20 and improve the pressure release speed of the battery cell 20.

[0137] According to some embodiments of the present application, as shown in FIG. 6, the connection position between the first cut groove segment 2115a and the second cut groove segment 2115b is offset from both ends of the first cut groove segment 2115a, and the connection position between the third cut groove segment 2115c and the second cut groove segment 2115b is offset from both ends of the third cut groove segment 2115c.

[0138] Here, the connection between the first cut groove segment 2115a and the second cut groove segment 2115b is offset from the ends of the first cut groove segment 2115a, i.e., the second cut groove segment 2115b is connected between the ends of the first cut groove segment 2115a. Similarly, the connection between the third cut groove segment 2115c and the second cut groove segment 2115b is offset from the ends of the third cut groove segment 2115c, i.e., the second cut groove segment 2115b is connected between the ends of the third cut groove segment 2115c. The shape of the notch 2115 formed by the first notch segment 2115a, the second notch segment 2115b and the third notch segment 2115c together may be a structure that approximates an "H" shape, i.e., the extension direction of the second notch segment 2115b may be arranged at a non-zero angle with the arrangement direction of the first notch segment 2115a and the third notch segment 2115c.

[0139] The connection position between the first cutout segment 2115a and the second cutout segment 2115b is set to be located between both ends of the first cutout segment 2115a, and the connection position between the third cutout segment 2115c and the second cutout segment 2115b is set to be located between both ends of the third cutout segment 2115c. This allows the wall portions 211 to be located on both sides of the second cutout segment 2115b, and the two regions between the first cutout segment 2115a and the third cutout segment 2115c to open in an opposite manner when the battery cell 20 is being pressure-released, which is beneficial to further improving the pressure-release effect of the battery cell 20 and effectively increasing the pressure-release speed of the battery cell 20.

[0140] In some embodiments, the first and third cut groove segments 2115a and 2115c are both perpendicular to the second cut groove segment 2115b, i.e., the extension direction of the second cut groove segment 2115b is perpendicular to the extension direction of the first and third cut groove segments 2115a and 2115c, such that the shape of the cut groove 2115 formed by the first, second, and third cut groove segments 2115a and 2115c together is an "H"-shaped structure, and two open areas 2116 are formed on either side of the second cut groove segment 2115b, and of course, the areas of the two open areas 2116 may be the same or different.

[0141] By arranging the first groove segment 2115a and the third groove segment 2115c so that they are both perpendicular to the second groove segment 2115b, the extension direction of the second groove segment 2115b is aligned with the arrangement direction of the first groove segment 2115a and the third groove segment 2115c. On the one hand, this improves the regularity of the shape of the grooves 2115, reduces the difficulty of processing the grooves 2115, and is advantageous for reducing the manufacturing costs of the battery cell 20. On the other hand, the wall portions 211 located on both sides of the second groove segment 2115b and the two regions located between the first groove segment 2115a and the third groove segment 2115c can easily open in opposite directions when the battery cell 20 is released from pressure.

[0142] In some embodiments, the connection between the first groove segment 2115a and the second groove segment 2115b is located at the midpoint of the first groove segment 2115a, and / or the connection between the third groove segment 2115c and the second groove segment 2115b is located at the midpoint of the third groove segment 2115c.

[0143] For example, in FIG. 6, the connection position between the first groove segment 2115a and the second groove segment 2115b is located at the midpoint of the first groove segment 2115a, and the connection position between the third groove segment 2115c and the second groove segment 2115b is located at the midpoint of the third groove segment 2115c, forming two open areas 2116 with the same area on either side of the second groove segment 2115b.

[0144] By setting the connection position between the first cut groove segment 2115a and the second cut groove segment 2115b to be located at the midpoint of the first cut groove segment 2115a, and / or by setting the connection position between the third cut groove segment 2115c and the second cut groove segment 2115b to be located at the midpoint of the third cut groove segment 2115c, it is possible to alleviate the phenomenon in which the wall portion 211 is located on both sides of the second cut groove segment 2115b and the two regions located between the first cut groove segment 2115a and the third cut groove segment 2115c have an excessively large area difference. This is advantageous in that it makes it possible to achieve an approximation of the force required for the wall portion 211 to be located on both sides of the second cut groove segment 2115b and the two regions located between the first cut groove segment 2115a and the third cut groove segment 2115c to open toward each other when the pressure on the battery cell 20 is released, thereby facilitating the release of pressure on the battery cell 20.

[0145] 3 and 6, the first groove 2113 may include a first groove segment 2113a, a second groove segment 2113b, and a third groove segment 2113c, where the first groove segment 2113a and the third groove segment 2113c are spaced apart, and the second groove segment 2113b connects the first groove segment 2113a and the third groove segment 2113c. The first notched groove segment 2115a is provided on the groove bottom surface of the first groove segment 2113a, the second notched groove segment 2115b is provided on the groove bottom surface of the second groove segment 2113b, and the third notched groove segment 2115c is provided on the groove bottom surface of the third groove segment 2113c.

[0146] Here, the first cut groove segment 2115a is provided corresponding to the groove bottom surface of the first groove segment 2113a, and the extension direction of the first cut groove segment 2115a is the same as the extension direction of the first groove segment 2113a, the second cut groove segment 2115b is provided corresponding to the groove bottom surface of the second groove segment 2113b, and the extension direction of the second cut groove segment 2115b is the same as the extension direction of the second groove segment 2113b. Similarly, the third cut groove segment 2115c is provided corresponding to the groove bottom surface of the third groove segment 2113c, and the extension direction of the third cut groove segment 2115c is the same as the extension direction of the third groove segment 2113c, so that the shape of the area for providing the cut grooves 2115 of the first groove 2113 is the same as the shape of the cut grooves 2115.

[0147] It should be noted that the groove depth of the first groove segment 2113a, the groove depth of the second groove segment 2113b, and the groove depth of the third groove segment 2113c may be the same or different, or even two of them may be the same. Similarly, the groove width of the first groove segment 2113a, the groove width of the second groove segment 2113b, and the groove width of the third groove segment 2113c may be the same or different, or even two of them may be the same. For example, in FIG. 6, the groove depth of the first groove segment 2113a, the groove depth of the second groove segment 2113b, and the groove width of the third groove segment 2113c are all the same, and the groove width of the first groove segment 2113a, the groove width of the second groove segment 2113b, and the groove width of the third groove segment 2113c are all the same, which is advantageous for reducing the requirements for processing equipment and making the first groove 2113 easier to process.

[0148] The first groove 2113 has a first groove segment 2113a, a second groove segment 2113b, and a third groove segment 2113c, and the first groove segment 2115a, the second groove segment 2115b, and the third groove segment 2115c of the cut groove 2115 are respectively arranged corresponding to the groove bottom surfaces of the first groove segment 2113a, the second groove segment 2113b, and the third groove segment 2113c, so that the first groove 2113 only needs to locally thin the position of the wall portion 211 for forming the cut groove 2115, which is advantageous in reducing the difficulty of processing the first groove 2113 and reducing the processing range of the first groove 2113.

[0149] 8 and 9, according to some embodiments of the present application, Fig. 8 is a structural schematic diagram of the wall portion 211 of the housing 21 according to some other embodiments of the present application, and Fig. 9 is a local structural schematic diagram facing the first surface 2111 of the wall portion 211 of the housing 21 according to some other embodiments of the present application. The first groove 2113 may further include a fourth groove segment 2113d, which connects the first groove segment 2113a and the third groove segment 2113c, and the fourth groove segment 2113d and the second groove segment 2113b are spaced apart along the extension direction of the first groove segment 2113a.

[0150] Here, both ends of the fourth groove segment 2113d of the first groove 2113 are connected to the first groove segment 2113a and the third groove segment 2113c, respectively, and the fourth groove segment 2113d and the second groove segment 2113b are arranged at a distance from each other, so that the open area 2116 can be inverted around the axis where the fourth groove segment 2113d is located to open the pressure relief.

[0151] Alternatively, the fourth groove segment 2113d may be located within the open region 2116, i.e., the connection position between the fourth groove segment 2113d and the first groove segment 2113a is offset from the end of the first groove segment 2113a, and the connection position between the fourth groove segment 2113d and the third groove segment 2113c is offset from the end of the third groove segment 2113c. Of course, the fourth groove segment 2113d may be located at the edge of the open region 2116, i.e., the open region 2116 is located between the fourth groove segment 2113d and the second groove segment 2113b, i.e., the fourth groove segment 2113d is connected to one end of the first groove segment 2113a, and the fourth groove segment 2113d is connected to one end of the third groove segment 2113c.

[0152] For example, the groove depth of the fourth groove segment 2113d is the same as the groove depth of the first groove segment 2113a and the groove depth of the third groove segment 2113c, and the groove width of the fourth groove segment 2113d is the same as the groove width of the first groove segment 2113a and the groove width of the third groove segment 2113c, so that the fourth groove segment 2113d can be machined simultaneously with machining the first groove segment 2113a and the third groove segment 2113c, which is advantageous in reducing the machining difficulty of the first groove 2113 on the one hand and in improving the machining efficiency of the first groove 2113 on the other hand.

[0153] The first groove 2113 further includes a fourth groove segment 2113d connected to the first groove segment 2113a and the third groove segment 2113c, and the fourth groove segment 2113d is spaced apart from the second groove segment 2113b in the extension direction of the first groove segment 2113a. This allows the wall 211 to split along the first groove segment 2115a, the second groove segment 2115b, and the third groove segment 2115c when the battery cell 20 is released from pressure, and the region of the wall 211 located between the first groove segment 2115a, the second groove segment 2115b, and the third groove segment 2115c can be inverted around the position of the fourth groove segment 2113d as an axis, making it easier to open during pressure release.

[0154] 9, both ends of the fourth groove segment 2113d are connected to one end of the first groove segment 2113a and one end of the third groove segment 2113c, respectively. That is, the fourth groove segment 2113d is located at the edge of the open area 2116, such that the open area 2116 is located between the fourth groove segment 2113d and the second groove segment 2113b.

[0155] By connecting both ends of the fourth groove segment 2113d to one end of the first groove segment 2113a and one end of the third groove segment 2113c, respectively, the area of ​​the region of the wall portion 211 located between the fourth groove segment 2113d and the second groove segment 2113b is increased, which is advantageous in reducing the difficulty of inverting the region of the wall portion 211 located between the first notched groove segment 2115a, the second notched groove segment 2115b and the third notched groove segment 2115c around the axis where the fourth groove segment 2113d is located, and in improving the pressure relief area of ​​the battery cell 20.

[0156] In some embodiments, as shown in FIGS. 8 and 9, the first groove 2113 may include two fourth groove segments 2113d, and along the extending direction of the first groove segment 2113a, the second groove segment 2113b is located between the two fourth groove segments 2113d.

[0157] Here, in the extending direction of the first groove segment 2113a, the two fourth groove segments 2113d are respectively located on both sides of the second groove segment 2113b, whereby the two open regions 2116 located on both sides of the second groove segment 2113b can be inverted about the positions where the corresponding fourth groove segments 2113d are located, thereby facilitating the two open regions 2116 to open oppositely and release pressure.

[0158] Exemplarily, the two fourth groove segments 2113d are respectively connected to both ends of the first groove segment 2113a, and the two fourth groove segments 2113d are respectively connected to both ends of the third groove segment 2113c. That is, the two fourth groove segments 2113d are respectively located at the edges of the corresponding open regions 2116, and the two open regions 2116 are respectively located between the second groove segment 2113b and the corresponding fourth groove segment 2113d, making the first groove 2113 in a "day" - shaped structure.

[0159] The first groove 2113 has two fourth groove segments 2113d, and in the extending direction of the first groove segment 2113a, the two fourth groove segments 2113d are respectively located on both sides of the second groove segment 2113b, whereby the wall portion 211 is located on both sides of the second cut - groove segment 2115b and the two regions located between the first cut - groove segment 2115a and the third cut - groove segment 2115c can be inverted about the positions where the corresponding fourth groove segments 2113d are located when opening oppositely, thereby improving the effect of opening oppositely and making it easier to release pressure.

[0160] 4 and 7, the second groove 2114 may include a fifth groove segment 2114a, a sixth groove segment 2114b, and a seventh groove segment 2114c, where the fifth groove segment 2114a and the seventh groove segment 2114c are spaced apart, and the sixth groove segment 2114b connects the fifth groove segment 2114a and the seventh groove segment 2114c. Along the thickness direction X of the wall portion, the fifth groove segment 2114a is arranged corresponding to the first groove segment 2113a, the sixth groove segment 2114b is arranged corresponding to the second groove segment 2113b, and the seventh groove segment 2114c is arranged corresponding to the third groove segment 2113c.

[0161] In the thickness direction X of the wall portion, the fifth groove segment 2114a is provided corresponding to the first groove segment 2113a, and the extension direction of the fifth groove segment 2114a is the same as the extension direction of the first groove segment 2113a; the sixth groove segment 2114b is provided corresponding to the second groove segment 2113b, and the extension direction of the sixth groove segment 2114b is the same as the extension direction of the second groove segment 2113b; Similarly, the seventh groove segment 2114c is arranged corresponding to the third groove segment 2113c, and the extension direction of the seventh groove segment 2114c is the same as the extension direction of the third groove segment 2113c, so that the second groove 2114 and the first groove 2113 are arranged corresponding to each other in the thickness direction X of the wall portion and have the same shape, that is, in the thickness direction X of the wall portion, the projection of the cut groove 2115 is located within the second groove 2114.

[0162] It should be noted that the groove depth of the fifth groove segment 2114a, the groove depth of the sixth groove segment 2114b, and the groove depth of the seventh groove segment 2114c may all be the same, may not all be the same, or may even be the same in pairs; similarly, the groove width of the fifth groove segment 2114a, the groove width of the sixth groove segment 2114b, and the groove width of the seventh groove segment 2114c may all be the same, may not all be the same, or may even be the same in pairs. For example, in FIG. 6, the groove depth of the fifth groove segment 2114a, the groove depth of the sixth groove segment 2114b, and the groove depth of the seventh groove segment 2114c are all the same, and the groove width of the fifth groove segment 2114a, the groove width of the sixth groove segment 2114b, and the groove width of the seventh groove segment 2114c are all the same, which is advantageous in reducing the requirements for processing equipment and making the second groove 2114 less difficult to process.

[0163] The second groove 2114 is provided with a fifth groove segment 2114a, a sixth groove segment 2114b, and a seventh groove segment 2114c, and the fifth groove segment 2114a, the sixth groove segment 2114b, and the seventh groove segment 2114c are provided corresponding to the first groove segment 2113a, the second groove segment 2113b, and the third groove segment 2113c of the first groove 2113, respectively, in the thickness direction X of the wall portion. As a result, the first groove 2113 and the second groove 2114 only need to locally thin both sides of the position where the cut groove 2115 of the wall portion 211 is to be formed, which is advantageous in reducing the difficulty of processing the second groove 2114 and in reducing the processing range of the second groove 2114.

[0164] 10 and 11, Fig. 10 is a structural schematic diagram of the wall portion 211 of the housing 21 according to some further embodiments of the present application, and Fig. 11 is a local structural schematic diagram facing the second surface 2112 of the wall portion 211 of the housing 21 according to some further embodiments of the present application. The second groove 2114 may further include an eighth groove segment 2114d, which connects the fifth groove segment 2114a and the seventh groove segment 2114c, and the eighth groove segment 2114d and the sixth groove segment 2114b are spaced apart along the extension direction of the fifth groove segment 2114a.

[0165] Here, both ends of the eighth groove segment 2114d of the second groove 2114 are connected to the fifth groove segment 2114a and the seventh groove segment 2114c, respectively, and the eighth groove segment 2114d and the sixth groove segment 2114b are arranged at a distance from each other, so that the open area 2116 can invert around the axis where the eighth groove segment 2114d is located to release pressure.

[0166] Alternatively, the eighth groove segment 2114d may be located within the open region 2116, i.e., the connection position between the eighth groove segment 2114d and the fifth groove segment 2114a is offset from the end of the fifth groove segment 2114a, and the connection position between the eighth groove segment 2114d and the seventh groove segment 2114c is offset from the end of the seventh groove segment 2114c; of course, the eighth groove segment 2114d may be located at the edge of the open region 2116, i.e., the open region 2116 is located between the eighth groove segment 2114d and the sixth groove segment 2114b, i.e., the eighth groove segment 2114d is connected to one end of the fifth groove segment 2114a, and the eighth groove segment 2114d is connected to one end of the seventh groove segment 2114c.

[0167] For example, the groove depth of the eighth groove segment 2114d is the same as the groove depth of the fifth groove segment 2114a and the groove depth of the seventh groove segment 2114c, and the groove width of the eighth groove segment 2114d is the same as the groove width of the fifth groove segment 2114a and the groove width of the seventh groove segment 2114c, so that the eighth groove segment 2114d can be machined simultaneously with machining the fifth groove segment 2114a and the seventh groove segment 2114c, which is advantageous in reducing the difficulty of machining the second groove 2114 on the one hand and in improving the machining efficiency of the second groove 2114 on the other hand.

[0168] It should be noted that in an embodiment in which the second groove 2114 has the eighth groove segment 2114d, the first groove 2113 may or may not have the fourth groove segment 2113d, and similarly, in an embodiment in which the first groove 2113 has the fourth groove segment 2113d, the second groove 2114 may or may not have the eighth groove segment 2114d. In an embodiment of the present application, the first groove 2113 is provided with the fourth groove segment 2113d, and the second groove 2114 is provided with the eighth groove segment 2114d at a position corresponding to the fourth groove segment 2113d along the thickness direction X of the wall of the second groove 2114.

[0169] The second groove 2114 further has an eighth groove segment 2114d connected to the fifth groove segment 2114a and the seventh groove segment 2114c, and the eighth groove segment 2114d is spaced apart from the sixth groove segment 2114b in the extension direction of the fifth groove segment 2114a, so that when the battery cell 20 is released from pressure, the wall portion 211 can be split along the first groove segment 2115a, the second groove segment 2115b, and the third groove segment 2115c, and the region of the wall portion 2111 located between the first groove segment 2115a, the second groove segment 2115b, and the third groove segment 2115c can be inverted around the position of the eighth groove segment 2114d as an axis, making it easier to open during pressure release.

[0170] 11, both ends of eighth groove segment 2114d are connected to one end of fifth groove segment 2114a and one end of seventh groove segment 2114c, respectively. That is, eighth groove segment 2114d is located at the edge of open area 2116, such that open area 2116 is located between eighth groove segment 2114d and sixth groove segment 2114b.

[0171] By connecting both ends of the eighth groove segment 2114d to one end of the fifth groove segment 2114a and one end of the seventh groove segment 2114c, respectively, the area of ​​the region of the wall portion 211 located between the eighth groove segment 2114d and the sixth groove segment 2114b is increased, which is advantageous in reducing the difficulty of inverting the region of the wall portion 211 located between the first notched groove segment 2115a, the second notched groove segment 2115b and the third notched groove segment 2115c around the axis where the eighth groove segment 2114d is located, and in improving the pressure relief area of ​​the battery cell 20.

[0172] In some embodiments, as shown in FIGS. 10 and 11, the second groove 2114 may include two eighth groove segments 2114d, and along the extending direction of the fifth groove segment 2114a, the sixth groove segment 2114b is located between the two eighth groove segments 2114d.

[0173] Here, in the extending direction of the fifth groove segment 2114a, the two eighth groove segments 2114d are respectively located on both sides of the sixth groove segment 2114b, whereby the two open regions 2116 located on both sides of the sixth groove segment 2114b can be inverted about the positions where the corresponding eighth groove segments 2114d are located, thereby facilitating the two open regions 2116 to open oppositely to release pressure.

[0174] Exemplarily, the two eighth groove segments 2114d are respectively connected to both ends of the fifth groove segment 2114a, and the two eighth groove segments 2114d are respectively connected to both ends of the seventh groove segment 2114c. That is, the two eighth groove segments 2114d are respectively located at the edges of the corresponding open regions 2116, and the two open regions 2116 are respectively positioned between the sixth groove segment 2114b and the corresponding eighth groove segment 2114d, making the second groove 2114 in a "day" - shaped structure. In the embodiments of the present application, the first groove 2113 and the second groove 2114 are both in a "day" - shaped structure, and the first groove 2113 and the second groove 2114 are correspondingly provided in the thickness direction X of the wall portion, whereby the projections of the wall portions of the first groove 2113 and the second groove 2114 in the thickness direction X of the wall portion are overlapped.

[0175] The second groove 2114 has two eighth groove segments 2114d, and in the extension direction of the fifth groove segment 2114a, the two eighth groove segments 2114d are respectively located on both sides of the sixth groove segment 2114b, so that the wall portion 211 is located on both sides of the second notched groove segment 2115b, and the two regions located between the first notched groove segment 2115a and the third notched groove segment 2115c can be reversed around the position of the corresponding eighth groove segment 2114d as an axis when opening oppositely, thereby improving the opening effect and making it easier to open when relieving pressure.

[0176] According to some embodiments of the present application, as shown in FIGS. 4 and 5 , along the thickness direction X of the wall portion, the groove depth of the first groove 2113 is H1, and the groove depth of the second groove 2114 is H2, which satisfy 0.2≦H1 / H2≦5.

[0177] Here, 0.2≦H1 / H2≦5, that is, the ratio of the depth of the first groove 2113 to the depth of the second groove 2114 is within 5 times.

[0178] For example, the groove depth of the first groove 2113 may be 0.2 times, 0.3 times, 0.5 times, 0.8 times, 1 time, 1.2 times, 1.5 times, 2 times, 3 times, 4 times, or 5 times the groove depth of the second groove 2114, etc.

[0179] Preferably, the groove depth of the first groove 2113 is equal to H1 and the groove depth of the second groove 2114 is equal to H2, ie, H1 / H2=1.

[0180] In some embodiments, the groove depth of the first groove 2113 along the thickness direction X of the wall portion is H1, and H1 ≥ 0.1 mm is satisfied. By setting the groove depth of the first groove 2113 in the thickness direction X of the wall portion to 0.1 mm or more, it is possible to alleviate a phenomenon in which the thinning effect at the position for providing the cut groove 2115 of the wall portion 211 is relatively poor due to the groove depth of the first groove 2113 being too small, and it is also possible to alleviate a phenomenon in which the groove depth of the first groove 2113 is too small and the difficulty of processing the first groove 2113 is too great.

[0181] For example, the groove depth of the first groove 2113 in the thickness direction X of the wall portion may be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, etc.

[0182] In some embodiments, the second groove 2114 has a groove depth H2 along the thickness direction X of the wall portion, satisfying H2≧0.1 mm. By setting the groove depth of the second groove 2114 in the thickness direction X of the wall portion to 0.1 mm or more, it is possible to alleviate a phenomenon in which the thinning effect at the position for providing the cut groove 2115 of the wall portion 211 is relatively poor due to the groove depth of the second groove 2114 being too small, and it is also possible to alleviate a phenomenon in which the second groove 2114 is too difficult to process due to the groove depth being too small.

[0183] For example, the groove depth of the second groove 2114 in the thickness direction X of the wall portion may be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, etc.

[0184] By setting the groove depth of the wall of the first groove 2113 in the thickness direction X to be 0.2 to 5 times the groove depth of the wall of the second groove 2114 in the thickness direction X, the phenomenon in which the shape of the fluid material during the formation of the cut groove 2115 is relatively poor due to the large deviation between the groove depth of the first groove 2113 and the groove depth of the second groove 2114 is alleviated, which is advantageous for the flow of material generated when the wall 211 forms the cut groove 2115, and thereby further improves the structural consistency of the cut groove 2115.

[0185] According to some embodiments of the present application, as shown in FIG. 5 , a distance L between the bottom surface of the first groove 2113 and the bottom surface of the second groove 2114 along the thickness direction X of the wall portion satisfies 0.3 mm≦L≦1 mm.

[0186] Here, the distance between the groove bottom surface of the first groove 2113 and the groove bottom surface of the second groove 2114 is L, i.e., the thickness of the area of ​​the wall portion 211 for providing the cut groove 2115 after providing the first groove 2113 and the second groove 2114 is L, i.e., the remaining thickness of the wall portion 211 after providing the first groove 2113 and the second groove 2114 is L.

[0187] 0.3 mm≦L≦1 mm, that is, the thickness of the wall portion 211 in the region where the cut groove 2115 is to be formed after the first groove 2113 and the second groove 2114 are formed is 0.3 mm to 1 mm.

[0188] For example, the distance L between the groove bottom surface of the first groove 2113 and the groove bottom surface of the second groove 2114 may be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm, etc.

[0189] By setting the distance in the thickness direction X of the wall portion between the groove bottom surface of the first groove 2113 and the groove bottom surface of the second groove 2114 to 0.3 mm to 1 mm, on the one hand, it is possible to alleviate the phenomenon in which the strength of the position of the wall portion 211 for forming the cut groove 2115 is insufficient due to the thickness being too small, thereby reducing the risk of the wall portion 211 breaking during the process of forming the cut groove 2115, and on the other hand, it is possible to alleviate the phenomenon in which the thickness is too large, resulting in the cut groove 2115 being too difficult to process and the shape of the fluid material being relatively poor during the process of forming the cut groove 2115, thereby improving the processing quality of the cut groove 2115.

[0190] It should be noted that in some embodiments, the first groove 2113 is a stepped groove provided along the thickness direction X of the wall portion, and / or the second groove 2114 is a stepped groove provided along the thickness direction X of the wall portion.

[0191] Here, the first groove 2113 is a stepped groove provided along the thickness direction X of the wall portion, that is, the first groove 2113 has a multi-step groove structure, and the multi-step grooves of the first groove 2113 are arranged along the thickness direction X of the wall portion. For example, the first groove 2113 may be a two-step groove, a three-step groove, a four-step groove, etc.

[0192] The second groove 2114 is a stepped groove provided along the thickness direction X of the wall portion, that is, the second groove 2114 has a multi-step groove structure, and the multi-step grooves of the second groove 2114 are arranged along the thickness direction X of the wall portion. For example, the second groove 2114 may be a two-step groove, a three-step groove, a four-step groove, etc.

[0193] By setting the first groove 2113 to have a stepped groove structure, the first groove 2113 is machined multiple times, the depth of each machining of the first groove 2113 is reduced, and the difficulty of machining can be reduced, and the molding force that the wall portion 211 receives when machining the first groove 2113 can be reduced, which is advantageous in reducing the risk of cracks occurring in the wall portion 211. Similarly, by setting the second groove 2114 to have a stepped groove structure, the second groove 2114 is machined multiple times, the depth of each machining of the second groove 2114 is reduced, and the difficulty of machining can be reduced, and the molding force that the wall portion 211 receives when machining the second groove 2114 can be reduced, which is advantageous in reducing the risk of cracks occurring in the wall portion 211.

[0194] According to some embodiments of the present application, still referring to FIG. 5 , the groove width of the first groove 2113 is W1 and satisfies 0.5 mm≦W1≦10 mm, and / or the groove width of the second groove 2114 is W2 and satisfies 0.5 mm≦W2≦10 mm.

[0195] Here, the groove width W1 of the first groove 2113 is the width of the groove bottom surface of the first groove 2113. It should be explained that if the first groove 2113 is a strip-shaped groove or an annular groove, the groove width W1 of the first groove 2113 is the size of the groove bottom surface of the first groove 2113 in a direction perpendicular to the extension direction of the first groove 2113. If the first groove 2113 is an "H"-shaped groove, a "V"-shaped groove or a "Sun"-shaped groove, the groove width W1 of the first groove 2113 is the width of the groove bottom surface of each groove segment of the first groove 2113.

[0196] Similarly, the groove width W2 of the second groove 2114 is the width of the groove bottom surface of the second groove 2114. It should be explained that when the second groove 2114 is a strip-shaped groove or an annular groove, the groove width W2 of the second groove 2114 is the size of the groove bottom surface of the second groove 2114 in a direction perpendicular to the extension direction of the second groove 2114, and when the second groove 2114 is an "H"-shaped groove, a "V"-shaped groove or a "Sun"-shaped groove, the groove width W2 of the second groove 2114 is the width of the groove bottom surface of each groove segment of the second groove 2114.

[0197] In some embodiments, the groove width of the first groove 2113 is W1, and satisfies 1 mm≦W1≦3 mm.

[0198] For example, the groove width W1 of the first groove 2113 may be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, or 3 mm.

[0199] In some embodiments, the groove width of the second groove 2114 is W2, and satisfies 1 mm≦W2≦3 mm.

[0200] For example, the groove width W2 of the second groove 2114 may be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, or 3 mm, etc.

[0201] By setting the groove width of the first groove 2113 to 0.5 mm to 10 mm, on the one hand, it is possible to alleviate the phenomenon in which the area in which the cut groove 2115 is provided on the bottom surface of the first groove 2113 is too small due to the groove width of the first groove 2113 being too small, and it is possible to increase the width of the area in which the cut groove 2115 is provided. Furthermore, when the battery cell 20 is subjected to an impact, the area in which the first groove 2113 is provided on the wall portion 211 can play a role in absorbing deformation, thereby reducing damage to the cut groove 2115 and making it easier for the material to flow when machining the cut groove 2115, thereby improving the conformity of the cut groove 2115. On the other hand, it is possible to alleviate the phenomenon in which the machining area is too large due to the groove width of the first groove 2113 being too large, thereby reducing the strength of the overall structure of the wall portion 211. Similarly, by setting the groove width of the second groove 2114 to 0.5 mm to 10 mm, on the one hand, it is possible to alleviate the phenomenon where the area where the cut groove 2115 is provided on the bottom surface of the second groove 2114 corresponding to the first groove 2113 is too small due to the groove width of the second groove 2114 being too small, and it is possible to increase the width of the area where the cut groove 2115 is provided. Furthermore, when the battery cell 20 is subjected to an impact, the area of ​​the wall portion 211 where the second groove 2114 is provided can play a role in absorbing deformation, thereby reducing damage to the cut groove 2115 and making it easier for the material to flow when machining the cut groove 2115, thereby improving the conformity of the cut groove 2115. On the other hand, it is possible to alleviate the phenomenon where the groove width of the second groove 2114 is too large, resulting in an excessively large machining area and a decrease in the strength of the overall structure of the wall portion 211.

[0202] According to some embodiments of the present application, the first surface 2111 is located away from the interior of the housing 21 along the thickness direction X of the wall, as shown in FIGS.

[0203] Here, the first surface 2111 is disposed away from the interior of the housing 21, i.e., the first surface 2111 is disposed away from the electrode assembly 22, and therefore the first groove 2113 and the notched groove 2115 are provided on a side of the wall 211 that faces away from the electrode assembly 22. Of course, in other embodiments, the first groove 2113 and the notched groove 2115 may be provided on a side of the wall 211 that faces the interior of the housing 21.

[0204] The first surface 2111 is a surface of the wall portion 211 that faces away from the inside of the housing 21, whereby the notch 2115 is provided on one side of the wall portion 211 that faces away from the inside of the housing 21, which is advantageous in reducing the difficulty of processing the notch 2115 and making it easier to process the notch 2115 in the wall portion 211.

[0205] 12, 13, and 14, Fig. 12 is a structural schematic diagram of a wall portion 211 of a housing 21 according to some other embodiments of the present application, Fig. 13 is a local cross-sectional view of the wall portion 211 of a housing 21 according to some other embodiments of the present application, and Fig. 14 is a local enlarged view of a portion B of the wall portion 211 of the housing 21 shown in Fig. 13. A sunken groove 2117 is provided on one side of the wall portion 211 that faces away from the interior of the housing 21 along the thickness direction X of the wall portion, and two surfaces of the sunken groove 2117 facing the groove bottom wall are a first surface 2111 and a second surface 2112, respectively.

[0206] Here, a recessed groove 2117 is provided on one side of the wall portion 211 that is away from the inside of the housing 21 , that is, the recessed groove 2117 is recessed on one side of the wall portion 211 that is away from the electrode assembly 22 .

[0207] The two surfaces facing the bottom wall of the sunken groove 2117 are the first surface 2111 and the second surface 2112, respectively; that is, the first groove 2113 and the second groove 2114 are respectively provided on both sides of the wall portion of the bottom wall of the sunken groove 2117 in the thickness direction X; that is, the cut groove 2115 is provided on the bottom surface of the sunken groove 2117 or on the surface of the bottom wall of the sunken groove 2117 facing the electrode assembly 22.

[0208] 13 and 14 , the first surface 2111 is disposed away from the interior of the housing 21, i.e., the first surface 2111 is the groove bottom surface of the sunken groove 2117, whereby the first groove 2113 is provided on the groove bottom surface of the sunken groove 2117. Of course, in other embodiments, the groove bottom surface of the sunken groove 2117 may be the second surface 2112, i.e., the second groove 2114 is provided on the groove bottom surface of the sunken groove 2117.

[0209] It should be noted that in some embodiments, as shown in Figures 4 and 5, the wall portion 211 may not have a recessed groove 2117, i.e., the first groove 2113 and the second groove 2114 are directly provided on both sides of the wall portion 211 in the thickness direction X of the wall portion, i.e., the surfaces on both sides of the wall portion 211 in the thickness direction X of the wall portion are the first surface 2111 and the second surface 2112, respectively.

[0210] By providing a sunken groove 2117 on one side of the wall portion 211 facing away from the interior of the housing 21, and the two opposing surfaces of the groove bottom wall of the sunken groove 2117 in the wall thickness direction X are respectively the first surface 2111 and the second surface 2112. In other words, the first groove 2113 and the second groove 2114 are respectively provided on both sides of the groove bottom wall of the sunken groove 2117 in the wall thickness direction X. This allows the sunken groove 2117 to provide a certain protective effect for the area of ​​the wall portion 211 where the cut groove 2115 is provided, thereby reducing the phenomenon of wear or damage to the area of ​​the wall portion 211 where the cut groove 2115 is provided due to the influence of the external environment, and further advantageously improving the service life of the battery cell 20.

[0211] In some embodiments, as shown in Figures 13 and 14, a protrusion 2118 is formed along the thickness direction X of the wall portion, facing one side of the interior of the housing 21 of the wall portion 211, at a position corresponding to the sunken groove 2117.

[0212] For example, the sunken groove 2117 formed in the wall portion 211 is formed by a pressing process, thereby forming the sunken groove 2117 on one side of the wall portion 211 facing away from the interior of the housing 21, and forming a protrusion 2118 on one side of the wall portion 211 facing the interior of the housing 21 at a position corresponding to the sunken groove 2117. Of course, the processing method of the sunken groove 2117 formed in the wall portion 211 is not limited to this, and in other embodiments, the sunken groove 2117 formed in the wall portion 211 may also be formed by processing processes such as laser etching, engraving, or casting.

[0213] Here, along the thickness direction X of the wall portion, the thickness of the wall portion 211 is D1, and the thickness of the groove bottom wall of the submerged groove 2117 is D2, and D1-D2≦1 mm is satisfied. In other words, after the submerged groove 2117 is press-formed, the difference between the thickness of the wall portion 211 and the thickness of the groove bottom wall of the submerged groove 2117 is less than 1 mm.

[0214] For example, in the thickness direction X of the wall portion, the difference between the thickness of the wall portion 211 and the thickness of the groove bottom wall of the submerged groove 2117 may be 1 mm, 0.8 mm, 0.7 mm, 0.6 mm, 0.5 mm, 0.3 mm, 0.2 mm, 0.1 mm, 0 mm, etc. Optionally, the thickness of the wall portion 211 is equal to the thickness of the groove bottom wall of the submerged groove 2117, that is, the difference between the thickness of the wall portion 211 and the thickness of the groove bottom wall of the submerged groove 2117 is 0 mm, which is advantageous for improving the structural strength of the groove bottom wall of the submerged groove 2117.

[0215] By forming a protrusion 2118 on one side of the wall portion 211 away from the sunken groove 2117 and at a position corresponding to the sunken groove 2117, the sunken groove 2117 of the wall portion 211 has a concave-convex structure formed by a pressing process, thereby allowing the sunken groove 2117 and the protrusion 2118 to be formed on both sides of the wall portion 211, respectively. The wall portion 211 adopting such a structure is easy to manufacture and is advantageous in reducing the processing difficulty of forming the sunken groove 2117 in the wall portion 211, thereby effectively improving the processing efficiency of the sunken groove 2117. On the other hand, it effectively improves the structural strength of the groove bottom wall of the sunken groove 2117, thereby reducing the risk of deformation or breakage when forming the first groove and the second groove on both sides of the groove bottom wall of the sunken groove 2117, respectively, which is advantageous in improving the production quality of the battery cell 20.

[0216] 3 , the housing 21 includes a case 212 and an end cap 213. The case 212 has an accommodating cavity formed therein, the accommodating cavity having an opening 2121 for accommodating the electrode assembly 22. The end cap 213 seals the opening 2121, and the end cap 213 is a wall portion 211.

[0217] Here, the end cap 213 is a wall portion 211, that is, the first groove 2113 and the second groove 2114 are respectively provided on both sides of the end cap 213 in the thickness direction of the end cap 213, and similarly, the notched groove 2115 is provided in the end cap 213.

[0218] The wall portion 211 of the housing 21 is an end cap 213 that seals the opening 2121 of the case 212 of the housing 21. A battery cell 20 that employs such a structure is advantageous in that it is possible to provide a first groove and a second groove in the end cap 213, and it is also easy to provide a notch 2115 on the bottom surface of the first groove, which effectively reduces the difficulty of processing the first groove, the second groove, and the notch 2115 in the housing 21 of the battery cell 20, and improves the production efficiency of the battery cell 20.

[0219] It should be noted that the structure of the battery cell 20 is not limited thereto, and in some embodiments, the battery cell 20 may have other structures. For example, the housing 21 includes a case 212 and an end cap 213. The case 212 includes an integrally molded side wall and wall portion 211. The side wall is disposed around the wall portion 211. Along the thickness direction X of the wall portion, one end of the side wall is connected to the wall portion 211 and the other end surrounds and forms an opening 2121. The side wall and the wall portion 211 together define an accommodating cavity for accommodating the electrode assembly 22. The end cap 213 seals the opening 2121. In other words, the wall portion 211 is a bottom wall on which the case 212 is installed opposite the end cap 213 in the thickness direction X of the wall portion, i.e., the first groove 2113 and the second groove 2114 are respectively provided on both sides of the bottom wall of the case 212, and similarly, the notched groove 2115 is provided in the bottom wall of the case 212.

[0220] Here, the case 212 includes integrally molded side walls and wall portion 211, i.e., the case 212 is manufactured by processing using an integral molding process, such as pressing, casting, or extrusion molding, i.e., the side walls and wall portion 211 of the case 212 are of an integral structure.

[0221] The wall 211 is a wall where the case 212 is installed opposite the end cap 213 in the wall thickness direction X. In a battery cell 20 employing this structure, the area of ​​the housing 21 where the notch 2115 is provided can be spaced away from the end cap 213, and there is no direct connection between the wall 211 and the end cap 213. This reduces the impact on the notch 2115 of the stress generated when the end cap 213 and the case 212 are connected to each other, reducing the occurrence of cracks or a decrease in structural strength at the location of the notch 2115 in the wall 211. This further effectively reduces the occurrence of premature opening of the valve in the battery cell 20 to relieve pressure, thereby improving the stability and service life of the battery cell 20.

[0222] According to some embodiments of the present application, the present application further provides a battery 100 including the battery cell 20 of any one of the above solutions.

[0223] 2 , the battery 100 may further include a housing 10, and the battery cells 20 are housed in the housing 10. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, and the first housing body 11 and the second housing body 12 are fitted over each other, and the first housing body 11 and the second housing body 12 collectively define an assembly space for housing the battery cells 20.

[0224] Alternatively, the second housing body 12 may have a hollow structure with one end open, and the first housing body 11 may have a plate-like structure, with the first housing body 11 placed over the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space; the first housing body 11 and the second housing body 12 may both have a hollow structure with one end open, with the open side of the first housing body 11 placed over the open side of the second housing body 12.

[0225] Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 may have various shapes, such as a cylinder or a rectangular parallelepiped, etc. Illustratively, in FIG. 2, the housing 10 has a rectangular parallelepiped structure.

[0226] In some embodiments, the battery cell 20 installed in the housing 10 may be one or more. For example, in FIG. 2 , a plurality of battery cells 20 are installed in the housing 10 of the battery 100, and the plurality of battery cells 20 may be connected in series, parallel, or series-parallel, where a series-parallel connection refers to both a series connection and a parallel connection among the plurality of battery cells 20. The plurality of battery cells 20 may be directly connected in series, parallel, or series-parallel, and the entire plurality of battery cells 20 may be housed in the housing 10. Of course, the battery 100 may be formed by first connecting the plurality of battery cells 20 in series, parallel, or series-parallel to form a battery module, and then connecting the plurality of battery modules in series, parallel, or series-parallel to form an integrated battery module housed in the housing 10.

[0227] Here, the battery 100 may further include other structures, for example, the battery 100 may further include bus bar members, which are connected to the plurality of battery cells 20 to realize electrical connection between the plurality of battery cells 20.

[0228] It should be noted that in some embodiments, the battery 100 may not be provided with the housing 10, and the battery 100 may include a plurality of battery cells 20. The battery 100, which is made up of the plurality of battery cells 20, may be directly assembled to a power consuming device, thereby providing electrical energy to the power consuming device via the plurality of battery cells 20. That is, the housing 10 may be a part of the power consuming device. For example, the power consuming device may be a vehicle 1000, and the housing 10 may be a part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may form at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may form at least a portion of a cross member and a side member of the vehicle 1000.

[0229] According to some embodiments of the present application, the present application further provides a power consuming device, which includes a battery 100 of any one of the above solutions, and the battery 100 is used to provide electrical energy to the power consuming device.

[0230] Here, the power consuming device may be any one of the above-mentioned devices or systems that utilizes the battery 100.

[0231] According to some embodiments of the present application, as shown in FIGS. 3 to 5 and 8 to 14 , the present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, and two electrode terminals 23. The electrode assembly 22 is accommodated in the housing 21. The electrode assembly 22 has two tabs 221. The polarities of the two tabs 221 of the electrode assembly 22 are opposite. The two electrode terminals 23 are both insulated and attached to the housing 21. The two electrode terminals 23 are electrically connected to the two tabs 221 of the electrode assembly 22, respectively, to realize the input or output of the positive and negative electrodes of the battery cell 20. The housing 21 has a wall 211, and includes a case 212 and an end cap 213. An accommodating cavity having an opening 2121 is formed inside the case 212, and the accommodating cavity is used to accommodate the electrode assembly 22. The end cap 213 seals the opening 2121. The end cap 213 is the wall 211, and the two electrode terminals 23 are both attached to the end cap 213. The wall 211 has a first surface 2111 and a second surface 2112 facing each other along the thickness direction X of the wall. A sunken groove 2117 is formed on one side of the wall 211 facing away from the interior of the housing 21. A protrusion 2118 is formed on the wall 211 facing the interior of the housing 21 at a position corresponding to the sunken groove 2117. The two surfaces facing the bottom wall of the sunken groove 2117 are the first surface 2111 and the second surface 2112, respectively. The first surface 2111 is disposed away from the interior of the housing 21. A first groove 2113 is formed on the first surface 2111. A second groove 2114 is formed on the second surface 2112 at a position corresponding to the first groove 2113. A notch 2115 is formed on the bottom of the first groove 2113, so that the wall 211 can be cracked along the notch 2115 when the battery cell 20 is released from pressure.The groove 2115 includes a first groove segment 2115a, a second groove segment 2115b, and a third groove segment 2115c, the first groove segment 2115a and the third groove segment 2115c being spaced apart, the second groove segment 2115b being perpendicular to the first groove segment 2115a and the third groove segment 2115c and being located between the first groove segment 2115a and the third groove segment 2115c, and both ends of the second groove segment 2115b being connected to the first groove segment 2115a and the third groove segment 2115c, respectively. The connection position between the first groove segment 2115a and the second groove segment 2115b is located at the midpoint of the first groove segment 2115a, and the connection position between the third groove segment 2115c and the second groove segment 2115b is located at the midpoint of the third groove segment 2115c, thereby forming two open areas 2116 in the areas of the wall portion 211 located on both sides of the second groove segment 2115b, so that the groove 2115 has an "H" shaped structure, and the first groove segment 2115a, the second groove segment 2115b and the third groove segment 2115c are arranged along the edges of the open area 2116, and the open area 2116 is configured to be openable with the first groove segment 2115a, the second groove segment 2115b and the third groove segment 2115c as boundaries.The first groove 2113 includes a first groove segment 2113a, a second groove segment 2113b, a third groove segment 2113c, and two fourth groove segments 2113d. The first groove segment 2113a and the third groove segment 2113c are provided at an interval. The second groove segment 2113b connects the first groove segment 2113a and the third groove segment 2113c. The first cut groove segment 2115a is provided on the groove bottom surface of the first groove segment 2113a. The second cut groove segment 2115b is provided on the groove bottom surface of the second groove segment 2113b. The third cut groove segment 2115c is provided on the groove bottom surface of the third groove segment 2113c. Both ends of the fourth groove segment 2113d are respectively connected to one end of the first groove segment 2113a and one end of the third groove segment 2113c. Along the extending direction of the first groove segment 2113a, the fourth groove segment 2113d and the second groove segment 2113b are provided at an interval, and the two fourth groove segments 2113d are respectively located on both sides of the second groove segment 2113b, whereby the first groove 2113 presents a structure in the shape of the Chinese character 'Ri' (日). The second groove 2114 includes a fifth groove segment 2114a, a sixth groove segment 2114b, a seventh groove segment 2114c, and two eighth groove segments 2114d. The fifth groove segment 2114a and the seventh groove segment 2114c are provided at an interval. The sixth groove segment 2114b connects the fifth groove segment 2114a and the seventh groove segment 2114c. Along the thickness direction X of the wall portion, the fifth groove segment 2114a is provided corresponding to the first groove segment 2113a, the sixth groove segment 2114b is provided corresponding to the second groove segment 2113b, and the seventh groove segment 2114c is provided corresponding to the third groove segment 2113c.Both ends of the eighth groove segment 2114d are respectively connected to one end of the fifth groove segment 2114a and one end of the seventh groove segment 2114c. Along the extending direction of the fifth groove segment 2114a, the eighth groove segment 2114d and the sixth groove segment 2114b are provided at an interval, and the two eighth groove segments 2114d are respectively located on both sides of the sixth groove segment 2114b. Thereby, the second groove 2114 presents a "day" - shaped structure and is installed corresponding to the first groove 2113 in the thickness direction X of the wall portion. Thereby, the projections of the wall portions of the first groove 2113 and the second groove 2114 in the thickness direction X of the wall portion are overlapped. Here, along the thickness direction X of the wall portion, the distance between the groove bottom surface of the first groove 2113 and the groove bottom surface of the second groove 2114 is L, the groove depth of the first groove 2113 is H1, the groove depth of the second groove 2114 is H2, and 0.3mm ≤ L ≤ 1mm, 0.2 ≤ H1 / H2 ≤ 5 are satisfied. The groove width of the first groove 2113 is W1, and 0.5mm ≤ W1 ≤ 10mm is satisfied. The groove width of the second groove 2114 is W2, and 0.5mm ≤ W2 ≤ 10mm is satisfied.

[0232] It should be noted that unless they collide, the embodiments and the features in the embodiments in this application can be combined with each other.

[0233] The above are only preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, various changes and modifications are possible to this application. Any modifications, equivalent replacements, improvements, etc. made within the scope of the spirit and principle of this application should all be included within the protection scope of this application.

[0234] 1000—vehicle, 100—battery, 10—enclosure, 11—first enclosure body, 12—second enclosure body, 20—battery cell, 21—housing, 211—wall, 2111—first surface, 2112—second surface, 2113—first groove, 2113a—first groove segment, 2113b—second groove segment, 2113c—third groove segment, 2113d—fourth groove segment, 2114—second groove, 2114a—fifth groove segment, 2114b—sixth groove segment, 2114 c—seventh groove segment, 2114d—eighth groove segment, 2115—cut groove, 2115a—first cut groove segment, 2115b—second cut groove segment, 2115c—third cut groove segment, 2116—open area, 2117—sunk groove, 2118—protrusion, 212—casing, 2121—opening, 213—end cap, 22—electrode assembly, 221—tab, 23—electrode terminal, 200—controller, 300—motor, X—wall thickness direction

Claims

1. A battery cell, a housing having a wall, the wall having opposing first and second surfaces along a thickness of the wall; a first groove is provided on the first surface, a second groove is provided on the second surface at a position corresponding to the first groove, a notched groove is provided on a bottom surface of the first groove, and the wall portion can be cracked along the notched groove when the battery cell is released from pressure.

2. 2. The battery cell of claim 1, wherein the score includes a first score segment and a second score segment, and the first score segment and the second score segment intersect.

3. 3. The battery cell of claim 2, wherein the cut groove further includes a third cut groove segment, the third cut groove segment and the first cut groove segment being spaced apart, and the second cut groove segment connecting the first cut groove segment and the third cut groove segment.

4. 4. The battery cell of claim 3, wherein a connection position between the first and second cut groove segments is offset from both ends of the first cut groove segment, and a connection position between the third and second cut groove segments is offset from both ends of the third cut groove segment.

5. The battery cell of claim 4 , wherein the first score segment and the third score segment are both perpendicular to the second score segment.

6. the connection between the first and second cut groove segments is located at the midpoint of the first cut groove segment; and / or The battery cell according to claim 4 or 5, wherein the connection point between the third cut groove segment and the second cut groove segment is located at a midpoint of the third cut groove segment.

7. the first groove includes a first groove segment, a second groove segment, and a third groove segment, the first groove segment and the third groove segment being spaced apart, and the second groove segment connecting the first groove segment and the third groove segment; 7. The battery cell of claim 3, wherein the first notched groove segment is provided on a groove bottom surface of the first groove segment, the second notched groove segment is provided on a groove bottom surface of the second groove segment, and the third notched groove segment is provided on a groove bottom surface of the third groove segment.

8. 8. The battery cell of claim 7, wherein the first groove further includes a fourth groove segment, the fourth groove segment connecting the first groove segment and the third groove segment, and the fourth groove segment and the second groove segment are spaced apart along the extension direction of the first groove segment.

9. The battery cell of claim 8 , wherein both ends of the fourth groove segment are connected to one end of the first groove segment and one end of the third groove segment, respectively.

10. 10. The battery cell according to claim 8 or 9, wherein the first groove includes two of the fourth groove segments, and the second groove segment is located between the two fourth groove segments along the extension direction of the first groove segment.

11. the second groove includes a fifth groove segment, a sixth groove segment, and a seventh groove segment, the fifth groove segment and the seventh groove segment being spaced apart, and the sixth groove segment connecting the fifth groove segment and the seventh groove segment; 11. The battery cell of claim 7, wherein, along a thickness direction of the wall portion, the fifth groove segment corresponds to the first groove segment, the sixth groove segment corresponds to the second groove segment, and the seventh groove segment corresponds to the third groove segment.

12. 12. The battery cell of claim 11, wherein the second groove further includes an eighth groove segment, the eighth groove segment connecting the fifth groove segment and the seventh groove segment, and the eighth groove segment and the sixth groove segment being spaced apart along the extension direction of the fifth groove segment.

13. 13. The battery cell of claim 12, wherein both ends of the eighth groove segment are connected to one end of the fifth groove segment and one end of the seventh groove segment, respectively.

14. 14. The battery cell of claim 12 or 13, wherein the second groove includes two of the eighth groove segments, and the sixth groove segment is located between the two eighth groove segments along the extension direction of the fifth groove segment.

15. The groove depth of the first groove along the thickness direction of the wall portion is H １ and the groove depth of the second groove is H ２ and 0.2≦H １ / H ２ The battery cell according to claim 1 , wherein the battery cell satisfies the following:

16. 16. The battery cell according to claim 1, wherein a distance L between a groove bottom surface of the first groove and a groove bottom surface of the second groove along a thickness direction of the wall portion satisfies 0.3 mm≦L≦1 mm.

17. The groove width of the first groove is W １ and 0.5 mm≦W １ and / or The groove width of the second groove is W ２ and 0.5 mm≦W ２ The battery cell according to claim 1 , wherein the thickness satisfies ≦10 mm.

18. The first groove is a stepped groove provided along the thickness direction of the wall portion, and / or The battery cell according to claim 1 , wherein the second groove is a stepped groove provided along a thickness direction of the wall portion.

19. The battery cell according to claim 1 , wherein the first surface is positioned away from the interior of the housing along a thickness direction of the wall portion.

20. 20. The battery cell of claim 1, wherein a recessed groove is provided along the thickness direction of the wall portion on one side of the wall portion that faces away from the interior of the housing, and the two surfaces facing the groove bottom wall of the recessed groove are the first surface and the second surface, respectively.

21. The battery cell according to claim 20 , wherein a protrusion is formed along the thickness direction of the wall portion, facing one side of the interior of the housing, at a position corresponding to the recess.

22. The housing includes: a case having an accommodating cavity formed therein with an opening, the accommodating cavity being used to accommodate an electrode assembly; an end cap sealing the opening; The battery cell of claim 1 , wherein the end cap is the wall portion.

23. The housing includes: a case including an integrally molded side wall and the wall portion, the side wall being disposed around the periphery of the wall portion, one end of the side wall being connected to the wall portion along a thickness direction of the wall portion and the other end being surrounding and forming an opening, the side wall and the wall portion together defining a receiving cavity for receiving an electrode assembly; 22. The battery cell of claim 1, further comprising an end cap sealing the opening.

24. A battery comprising the battery cell of any one of claims 1 to 23.

25. 25. A power consuming device comprising the battery of claim 24.

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