Energy Storage Device

Abstract

An embodiment of the present application discloses an energy storage device for storing a plurality of batteries 10, the energy storage device including a first wall 31 and a pressure release assembly 32 mounted on the first wall 31. Therefore, the energy storage device according to the embodiment of the present application can improve the reliability of the energy storage device.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims priority to Chinese Patent Application No. 202310340880.6, filed on March 31, 2023, for invention entitled "Energy Storage Device," the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of batteries, and more particularly to energy storage devices. [Background technology]

[0003] As support for the development of new energy technologies increases worldwide, various energy storage technologies are being widely applied, including a method for storing and transporting multiple batteries using an electrical cabinet as an energy storage device. Multiple batteries are stored in the electrical cabinet, and the multiple batteries can be charged and managed collectively. Considering the possibility of individual batteries experiencing thermal runaway during the transportation and management of multiple batteries, how to improve the reliability of energy storage devices is currently an issue that needs to be resolved urgently. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present application provide an energy storage device that can improve the reliability of the energy storage device. [Means for solving the problem]

[0005] In a first aspect, there is provided an energy storage device for housing a plurality of batteries, the energy storage device including a first wall and a pressure relief assembly mounted to the first wall.

[0006] Therefore, a pressure release assembly is installed on the first wall of the energy storage device according to the embodiment of the present application, and in the event that a battery in the energy storage device experiences thermal runaway, when the pressure or temperature within the energy storage device reaches a predetermined threshold, the pressure release assembly operates to release the pressure or temperature inside the energy storage device, thereby improving the reliability of the energy storage device.

[0007] In some embodiments, a through-hole is provided in the first wall, and the pressure release assembly covers the through-hole. By providing a through-hole in the first wall and then covering the through-hole with the pressure release assembly, the first wall and the pressure release assembly can be installed as separate structures. This separate installation method makes the structure of the pressure release assembly more flexible and can more easily meet the design requirements of the energy storage device for pressure release.

[0008] In some embodiments, an adapter member is provided around the through-hole of the first wall to connect the first wall and the pressure relief assembly, and by providing a specific adapter member for fixed connection between the first wall and the pressure relief assembly, the connection and sealing requirements between the first wall and the pressure relief assembly can be better met.

[0009] In some embodiments, the adapter member protrudes from a surface of the first wall facing away from the interior of the energy storage device. When the adapter member protrudes from the outer surface of the first wall, a connection portion between the adapter member and the pressure release assembly may also protrude from the outer surface of the first wall, increasing the height of the connection portion between the adapter member and the pressure release assembly along the height direction and reducing interaction with components inside the first wall, while increasing the height of the connection interface between the adapter member and the pressure release assembly and improving sealing of the connection interface.

[0010] In some embodiments, the adapter member forms an accommodation space, the adapter member and the pressure relief assembly are connected by a first connecting member, and the accommodation space is used to accommodate at least a portion of the first connecting member. The adapter member may be used to form the accommodation space, and at least a portion of the first connecting member between the adapter member and the pressure relief assembly may be located within the accommodation space, i.e., at least a portion of the first connecting member may be located at a specific position, which can reduce the influence of the first connecting member on other members and facilitate installation.

[0011] In some embodiments, the adapter member includes a groove in which the receiving space is formed, with the opening of the groove facing away from the center of the through-hole. On the one hand, the receiving space is realized by the groove, which is simple and easy to implement. On the other hand, the bottom wall of the groove is closer to the center of the through-hole, i.e., closer to the center of the pressure relief assembly. When the first connecting member between the pressure relief assembly and the adapter member is installed on the side wall of the groove, the bottom wall of the groove plays a supporting role and bears the force of part of the pressure relief assembly, thereby further increasing the structural strength of the pressure relief assembly. On the other hand, since the distance between the first connecting member and the bottom wall of the groove needs to meet sealing and strength requirements, locating the bottom wall of the groove closer to the center of the through-hole can reduce the area of ​​the first wall occupied by the adapter member and the pressure relief assembly, thereby reducing the space occupied by the adapter member and the pressure relief assembly, thereby making the structure more compact.

[0012] In some embodiments, the adapter member and the first wall are of one-piece construction, which may improve the seal between the adapter member and the first wall.

[0013] In some embodiments, the adapter member and the first wall are installed separately, and the adapter member and the first wall are connected by a second connecting member. By installing the adapter member and the first wall separately, the complexity of the structure of the first wall can be reduced and the processing of the adapter member can be facilitated.

[0014] In some embodiments, the adapter member includes a first portion, a second portion, and a third portion, the second portion being used to connect the first portion and the third portion, which are arranged opposite to each other, the first portion, the second portion, and the third portion being used to form an enclosed storage space, the first portion being connected to the pressure release assembly via a first connecting member, the storage space being used to accommodate at least a portion of the first connecting member, and the third portion being connected to the first wall by the second connecting member. The first portion, the second portion, and the third portion are arranged to form a groove-shaped adapter member having a storage space, which has a simple structure and is easy to implement.

[0015] In some embodiments, the first connecting member includes a rivet structure and / or a bolt structure, and the first connecting member penetrates the pressure release assembly and the first part, which is simple in structure and easy to implement.

[0016] In some embodiments, the second connecting member includes a welded seam formed by welding the third portion and the first wall, and by fixing the third portion and the first wall by welding, the sealing property and structural stability between the third portion and the first wall can be improved.

[0017] In some embodiments, the second connecting member includes a sealing member installed at the weld seam, which further seals the weld seam, thereby further improving the sealing between the adapter member and the first wall.

[0018] In some embodiments, a protruding structure protruding inward away from the energy storage device is provided around the through hole of the first wall, which can, on the one hand, position the adapter member and facilitate positioning and attachment of the adapter member, and, on the other hand, can further improve the connection interface between the pressure release assembly and the adapter member, thereby improving sealing.

[0019] In some embodiments, the weld seam is located on the protruding structure, which is configured to protrude, making it difficult for external environmental substances such as rainwater to accumulate on the protruding structure, preventing the weld seam from being affected by these substances and further improving the sealing performance of the weld seam.

[0020] In some embodiments, the energy storage device further includes a support structure corresponding to the pressure release assembly and located on a side of the pressure release assembly facing the interior of the energy storage device. Because the pressure release assembly can immediately release when the temperature or pressure inside the energy storage device reaches a predetermined threshold, the structural strength of the pressure release assembly is typically weaker than that of other regions of the first wall, making the pressure release assembly more easily destroyed or damaged during normal use of the energy storage device. Therefore, the support structure can support the pressure release assembly on the side of the pressure release assembly closest to the energy storage device, reducing the likelihood of the pressure release assembly collapsing or failing if an external load is too large during normal use of the energy storage device, improving the structural strength of the pressure release assembly, and reducing the impact on the operation of the pressure release assembly if thermal runaway occurs within the energy storage device. The pressure release assembly can immediately release the temperature or pressure inside the energy storage device, thereby improving the reliability of the energy storage device.

[0021] In some embodiments, the support structure is connected to the inner wall of the through-hole, and at least a portion of the support structure is located inside the through-hole. By locating the support structure at least a portion inside the through-hole, it is possible to save space and to reduce the distance between the support structure and the pressure relief assembly in order to enhance the support effect of the support structure on the pressure relief assembly.

[0022] In some embodiments, the support structure includes at least two crossing support strips, whereby the at least two crossing support strips extend along different directions, further increasing structural strength in multiple directions.

[0023] In some embodiments, the pressure release assembly includes a pressure release tab having a weakened area disposed thereon. When the pressure or temperature inside the energy storage device reaches a predetermined threshold, the weakened area of ​​the pressure release tab is easily broken, causing the pressure release tab to rapidly open, and high-temperature and high-pressure wastewater inside the energy storage device is rapidly discharged from the energy storage device through the through-hole and the broken pressure release tab, thereby reducing the possibility of the energy storage device exploding and improving the reliability of the energy storage device.

[0024] In some embodiments, an edge region of the pressure release tab is connected to the first wall, and the weakened region is located on at least a portion of the edge region of the pressure release tab, closer to the center of the pressure release tab. By providing the weakened region on at least a portion of the edge region, when the pressure or temperature inside the energy storage device reaches a predetermined threshold, at least a portion of the edge region can be broken, allowing high-temperature, high-pressure discharge inside the energy storage device to be immediately discharged through the broken region. Furthermore, because the weakened region is located in the edge region, the area surrounded by the weakened region is relatively large. Therefore, when the pressure release tab is broken, the area opened by the pressure release tab is large, allowing high-temperature, high-pressure discharge inside the energy storage device to be more quickly discharged, further reducing the possibility of an explosion and improving reliability.

[0025] In some embodiments, the weakened area is not provided in a portion of the edge region of the pressure release tab. Because the weakened area is not provided in a portion of the edge region of the pressure release tab, if the edge region where the weakened area is provided is destroyed, the pressure release tab is released from the weakened area, and the edge region without the weakened area can remain connected. That is, by bending the pressure release tab at the edge region without the weakened area, high-temperature and high-pressure discharge from the inside of the energy storage device can be immediately released through the released region, and the structural integrity of the pressure release tab can be maintained as much as possible, thereby minimizing the risk of localized areas of the pressure release tab scattering and causing damage to other structures or personnel.

[0026] In some embodiments, the weakened area includes a notch that is positioned such that the opening of the pressure release tab faces away from the interior of the energy storage device. When the pressure or temperature inside the energy storage device reaches a predetermined threshold, the pressure release tab is easily broken at a possible location due to the thin thickness at the notch, and the pressure release tab is immediately opened, thereby venting high-temperature and high-pressure exhaust inside the energy storage device.

[0027] In some embodiments, the pressure release assembly includes a cover located on a side of the pressure release tab away from the interior of the energy storage device and covering the pressure release tab. Because the structural strength of the pressure release tab is insufficient, installing a cover on the side of the pressure release tab away from the interior of the energy storage device can protect the pressure release tab, reduce the impact of the external environment of the energy storage device on the pressure release tab, improve the stability of the pressure release tab during normal use of the energy storage device, and minimize premature failure of the pressure release tab.

[0028] In some embodiments, the cover has a groove structure with an opening facing the pressure release tab, and an extension portion is provided in a portion of a side wall of the cover, extending from an end of the side wall close to the opening in a direction away from the side wall, the extension portion being used to connect the side wall and the first wall. During normal use of the energy storage device, the cover can cover the surface of the pressure release tab by gravity to protect it, and if a battery inside the energy storage device experiences thermal runaway, the pressure release tab will be destroyed and the waste inside the energy storage device will be discharged through the pressure release tab and then immediately discharged to the outside of the energy storage device through the region of the side wall of the cover that is not fixed to the first wall, so as to minimize explosion of the energy storage device.

[0029] In some embodiments, the extension corresponds to the side of the pressure release tab where the weakened area is not located. In this way, when the pressure or temperature inside the energy storage device reaches a predetermined threshold, the opening direction of the pressure release tab coincides with the opening direction of the cover, reducing the obstruction to the effluent, thereby allowing the effluent inside the energy storage device to be quickly and smoothly evacuated from the energy storage device and improving the reliability of the energy storage device.

[0030] In some embodiments, the extension and the first wall are connected by a first connecting member, which has a simple structure and is easy to implement.

[0031] In some embodiments, the pressure release assembly includes an edge structure that is installed to surround the edge of the cover, the edge structure including a fourth portion and a fifth portion that are connected to each other and bent relative to each other, the fourth portion being located within the groove structure, and the fifth portion being located between the extension portion and the first wall and connected to the first wall.

[0032] In the above technical solution, because the cover has a portion that is not directly connected to the first wall or the adapter member, there is a gap between the edge of the cover and the first wall or the adapter member, and substances from the external environment may enter the inside of the energy storage device through the gap and further affect devices inside the energy storage device, for example, rainwater may enter the energy storage device and affect the pressure release assembly. Therefore, an edge structure may be provided on the edge of the cover, and the edge structure may include a fourth part and a fifth part that are bent relative to each other, and the edge structure may surround the edge of the cover to reduce substances from the external environment from entering the energy storage device through the gap at the edge of the cover. For example, the edge structure may reduce rainwater from entering the inside of the energy storage device, thereby protecting the internal components of the energy storage device and improving the safety and sealing of the energy storage device.

[0033] In some embodiments, the pressure release tab has a first locating notch, and the extension has a second locating notch that corresponds to the first locating notch. In this manner, the extension and the pressure release tab can be aligned. For example, if the first locating notch is located on the side of the pressure release tab where the weakened region is not located, the second locating notch can be used to locate the extension on the side where the weakened region is not located, thereby improving installation efficiency.

[0034] The edge structure has a third locating notch disposed corresponding to the first locating notch. On the one hand, the third locating notch of the edge structure may position the mounting position of the edge structure to improve mounting efficiency, and on the other hand, the third locating notch may correspond to another locating structure, for example, the other locating structure may be disposed corresponding to the first locating notch via the third locating notch to position the other structure to improve mounting efficiency of the pressure release assembly.

[0035] In some embodiments, the first locating notch does not pass through the centerline of the edge of the pressure release tab where the first locating notch is located. The first locating notch may be located at a position other than the centerline to minimize the risk of incorrectly installing the opposing surfaces of the pressure release tab when installing the pressure release tab. For example, since the opening of the notch of the pressure release tab typically needs to face the exterior of the energy storage device, the first locating notch minimizes the risk of incorrectly installing the notch opening of the pressure release tab, improving installation efficiency.

[0036] In some embodiments, the first positioning notch is provided in an edge region of the pressure release tab where the weakened region is not provided, and the first positioning notch can position the edge region where the weakened region of the pressure release tab is not provided, thereby enabling the pressure release tab to open along a specific direction when broken, thereby discharging the discharged material from the inside of the energy storage device in a specific direction, thereby reducing the impact of the high-temperature, high-pressure discharged material on the outside.

[0037] In some embodiments, the cover has a groove structure with an opening facing the pressure release tab, and a portion of a side wall of the cover and the first wall are rotatably connected by a third connecting member. During normal use of the energy storage device, the cover can gravity-wise cover the surface of the pressure release tab to protect it. If a battery inside the energy storage device experiences thermal runaway, the pressure release tab will be destroyed and the waste inside the energy storage device will be discharged through the pressure release tab. The cover can then be rotated open by the third connecting member installed on the side wall, allowing the waste to be immediately discharged to the outside of the energy storage device to minimize explosion of the energy storage device.

[0038] In some embodiments, the pressure release assembly includes a two-layer seal structure, at least a portion of which is located on either side of the edge region of the pressure release tab, i.e., the pressure release tab is sandwiched between the two-layer seal structure to improve sealing on both sides of the pressure release tab.

[0039] In some embodiments, each of the two-layer sealing structures is annular and surrounded by the edge region of the pressure release tab, thereby reducing the effect of the sealing structure on the central region of the pressure release tab so that when the pressure or temperature inside the energy storage device reaches a predetermined threshold, the pressure release tab can immediately open to release the internal pressure or temperature.

[0040] In some embodiments, a filling structure is installed between the cover and the pressure release tab. On the one hand, the filling structure can improve the sealing and structural stability between the cover and the pressure release tab, and on the other hand, when some substances from the external environment may enter the inside of the energy storage device through the gap between the cover and the first wall, the filling structure may also have a certain absorption effect. For example, when rainwater may enter the inside of the energy storage device through the gap between the cover and the first wall, the filling structure can absorb some of the rainwater to prevent the rainwater from affecting devices in the energy storage device.

[0041] In some embodiments, the material of the filling structure includes at least one of rock wool, flame-retardant polyurethane foam, glass wool, and phenolic foam to improve sealing. In particular, by using a flame-retardant material, heat diffusion and combustion can be reduced as much as possible so as to prevent explosion of the energy storage device when a battery inside the energy storage device experiences thermal runaway.

[0042] In some embodiments, the first wall is a top wall of the energy storage device. When the pressure relief assembly of the first wall is activated, waste from within the energy storage device can be discharged upward, i.e., in a direction opposite to the direction of gravity, through the destroyed pressure relief assembly, thereby reducing damage to personnel or components in the surrounding environment due to high-temperature and high-pressure waste from the energy storage device and improving reliability compared to when the first wall is located on another wall.

[0043] In some embodiments, the surface of the top wall facing away from the interior of the energy storage device is sloped in the direction of gravity from the central region toward the edge region, so that when substances from the external environment, such as rainwater, fall onto the outer surface of the top wall, the substances can slide down along the sloped outer surface of the top wall due to gravity, reducing the amount of substances, such as rainwater, that accumulate on the outer surface of the top wall, reducing the load-bearing capacity of the top wall, and further improving the service life of the top wall and the energy storage device.

[0044] In some embodiments, the top wall is provided with reinforcing ribs to increase the structural strength of the top wall.

[0045] In some embodiments, the battery includes multiple battery cells to meet different power usage needs. [Brief explanation of the drawings]

[0046] [Figure 1] 1 is a structural schematic diagram of a battery according to an embodiment of the present application; [Figure 2] 1 is a structural schematic diagram of a plurality of battery cells according to an embodiment of the present application; [Figure 3] FIG. 2 is an exploded view of a battery cell according to an embodiment of the present application. [Figure 4] 1 is a structural schematic diagram of an energy storage device according to an embodiment of the present application; [Figure 5] 1 is a schematic side view of an energy storage device according to an embodiment of the present application; [Figure 6] FIG. 2 is a schematic top view of a first wall according to an embodiment of the present application. [Figure 7] 2 is a partial cross-sectional schematic view of a first wall according to an embodiment of the present application; [Figure 8] FIG. 10 is a schematic top view of a first wall according to another embodiment of the present application. [Figure 9] 10 is another partial cross-sectional schematic view of a first wall according to an embodiment of the present application. [Figure 10] 10 is yet another partial cross-sectional schematic view of a first wall according to an embodiment of the present application. [Figure 11]FIG. 10 is a structural schematic diagram of the first wall when a pressure release assembly according to an embodiment of the present application is not installed. [Figure 12] 1 is a structural schematic diagram of an adapter member according to an embodiment of the present application; [Figure 13] 1 is an exploded structural schematic diagram of a pressure relief assembly and an adapter member according to one embodiment of the present disclosure. [Figure 14] 1 is a schematic diagram of a pressure release tab according to one embodiment of the present application. [Figure 15] 1 is a structural schematic diagram of a cover according to an embodiment of the present application; [Figure 16] FIG. 2 is a schematic top view of a cover according to an embodiment of the present application. [Figure 17] FIG. 2 is a schematic side view of a cover according to an embodiment of the present application. [Figure 18] FIG. 10 is a schematic top view of a cover according to another embodiment of the present application. [Figure 19] 1 is a structural schematic diagram of an edge structure according to an embodiment of the present application; [Figure 20] 1 is a top view schematic diagram of an edge structure according to one embodiment of the present application; [Figure 21] 1 is a side schematic view of an edge structure according to one embodiment of the present application; [Figure 22] 1 is a schematic top view of a seal structure according to one embodiment of the present application, which is not drawn to scale. DETAILED DESCRIPTION OF THE INVENTION

[0047] Hereinafter, technical solutions in the embodiments of the present application will be described with reference to the drawings.

[0048] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application, but it is obvious that the described embodiments are only some of the embodiments of the present application, and do not represent all of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without any creative work also fall within the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of this application, and the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the application, and the terms "comprise" and "have" and any variations thereof in the specification, claims, and drawings of this application are intended to cover a non-exclusive inclusion. Terms such as "first," "second," etc. in the specification, claims, and drawings of this application are used to distinguish between different objects and are not used to describe a particular order or priority.

[0050] In this application, a reference to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will understand, both explicitly and implicitly, that the embodiment described in this application may be combined with other embodiments.

[0051] In the description of this application, unless otherwise clearly specified or limited, the terms "mounted," "coupled," "connected," and "attached" should be understood in a broad sense, for example, to mean a fixed connection, a detachable connection, an integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. Those skilled in the art may understand the specific meanings of the above terms in this application according to specific circumstances.

[0052] The term "and / or" in this application is simply a relational relationship that describes related objects, and indicates that three types of relationships can exist. For example, A and / or B can represent three cases: the presence of only A, the simultaneous presence of A and B, and the presence of only B. In addition, the symbol " / " in this application generally indicates that the related objects before and after it are in an "or" relationship.

[0053] In the embodiments of the present application, the same drawing symbols represent the same components, and for the sake of brevity, detailed descriptions of the same components will be omitted in different embodiments. It should be understood that the dimensions such as thickness, length, width, etc. of various components in the embodiments of the present application shown in the accompanying drawings, and the overall thickness, length, width, etc. of the integrated device, are merely exemplary and should not be construed as limitations of the present application.

[0054] As used herein, the term "plurality" refers to two or more (including two); similarly, "sets" refers to two or more (including two sets); and "plurality" refers to two or more (including two).

[0055] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be continuously used after being discharged by activating the active material through charging.

[0056] 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 examples of the present application are not limited thereto.

[0057] A battery cell generally includes an electrode assembly, which includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are repeatedly inserted and removed between the positive electrode and the negative electrode. The separator, which is installed between the positive electrode and the negative electrode, prevents short circuits between the positive electrode and the negative electrode while allowing the active ions to pass through.

[0058] In some embodiments, the positive electrode may be a positive electrode strip that may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0059] As an example, the positive electrode current collector has two surfaces that face each other in the thickness direction of the positive electrode current collector, and the positive electrode active material is disposed on one or both of the two facing surfaces of the positive electrode current collector.

[0060] For example, the positive electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector is formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymeric material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0061] For example, the positive electrode active material may include at least one of lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials in batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (also abbreviated as LFP)), a lithium iron phosphate-carbon composite, lithium manganese phosphate (e.g., LiMnPO4), a lithium manganese phosphate-carbon composite, lithium manganese iron phosphate, and a lithium manganese iron phosphate-carbon composite.

[0062] In some embodiments, the negative electrode may be a negative electrode strip, which may include a negative electrode current collector.

[0063] For example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector is 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 polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0064] As an example, the negative electrode piece can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0065] As an example, the negative electrode current collector has two surfaces that face each other in the thickness direction thereof, and the negative electrode active material is disposed on one or both of the two facing surfaces of the negative electrode current collector.

[0066] For example, the negative electrode active material may be any negative electrode active material known in the art for battery cells, and may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0067] In some embodiments, the negative electrode may be made of a metal foam, such as nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When the metal foam is used as the negative electrode piece, the negative electrode active material may or may not be provided on the surface of the metal foam.

[0068] For example, lithium metal and / or a lithium source material that is a lithium-rich material, potassium metal or sodium metal may be further filled and / or deposited in the negative electrode current collector.

[0069] In some embodiments, the material of the positive current collector may be aluminum and the material of the negative current collector may be copper.

[0070] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0071] In some embodiments, the separator is a separator film. The present application does not particularly limit the type of separator film, but any separator film having a known porous structure and good chemical and mechanical stability can be selected.

[0072] For example, the main material of the separator film may be at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0073] In some embodiments, the separator is a solid electrolyte that is disposed between the positive and negative electrodes and serves to transport ions and separate the positive and negative electrodes.

[0074] 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 may be selected as needed. The electrolyte may be in a liquid state, a gel state, or a solid state.

[0075] In some embodiments, the electrode assembly is a wound structure, with the positive and negative electrode pieces wound around the wound structure.

[0076] In some embodiments, the electrode assembly is a laminate structure.

[0077] For example, a plurality of positive electrode pieces and a plurality of negative electrode pieces may be provided, and the plurality of positive electrode pieces and the plurality of negative electrode pieces may be provided in an alternating stack.

[0078] As an example, a plurality of positive electrode pieces can be installed, and a plurality of negative electrode pieces can be folded to form a plurality of folds that are installed in a stack, with one positive electrode piece sandwiched between adjacent mating folds.

[0079] As an example, the positive and negative electrode pieces are each folded to form a plurality of folds that are arranged in a stacked manner.

[0080] For example, a plurality of separators may be provided, each disposed between any adjacent positive or negative electrode pieces.

[0081] As an example, the separator can be placed continuously and folded or wound between any adjacent positive or negative electrode pieces.

[0082] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, or polygonal.

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

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

[0085] As an example, the battery cells may be cylindrical battery cells, prismatic battery cells, soft-pack battery cells, or battery cells of other shapes, and prismatic battery cells include polygonal prismatic batteries such as rectangular battery cells, blade-shaped battery cells, and hexagonal battery cells, and the present application is not particularly limited thereto.

[0086] The battery referred to in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or series-parallel by a bus member.

[0087] In some embodiments, the battery may be a battery module, and when 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 including a case and battery cells, with the battery cells or modules housed within the case.

[0089] In some embodiments, an energy storage device may be employed to store and manage multiple batteries. Specifically, the energy storage device may include an electrical cabinet or an energy storage container, which is used to store and transport multiple batteries and can collectively manage and control the multiple batteries, for example, by charging the multiple batteries. Considering the possibility of individual batteries experiencing thermal runaway during the transportation and management of multiple batteries, how to reduce the explosion risk of energy storage devices is currently an urgent issue to be addressed.

[0090] Based on this, an embodiment of the present application provides an energy storage device for storing a plurality of batteries, wherein a pressure release assembly is installed in a first wall of the energy storage device, so that if a battery in the energy storage device experiences thermal runaway, the pressure release assembly is activated to release the pressure or temperature inside the energy storage device when the pressure or temperature inside the energy storage device reaches a predetermined threshold, thereby improving the reliability of the energy storage device.

[0091] As can be appreciated, the energy storage device according to the embodiments of the present application may be used to store batteries, and the energy storage device may be applied to scenarios such as home storage, outdoor energy storage, power grid, etc.

[0092] To meet different power needs, a battery may include multiple battery cells, which may be connected in series, parallel, or series-parallel, with the series-parallel connection referring to a combination of series and parallel connections. A battery may also be called a battery pack. Alternatively, multiple battery cells may be connected in series, parallel, or series-parallel to form a battery module, and multiple battery modules may be further connected in series, parallel, or series-parallel to form a battery. In other words, multiple battery cells may directly form a battery, or may first form a battery module, which may then form a battery.

[0093] For example, FIG. 1 shows a structural schematic diagram of a battery 10 according to an embodiment of the present application. The battery 10 may include a plurality of battery cells 20, and FIG. 2 shows a schematic diagram of the plurality of battery cells 20 included in the battery 10. As shown in FIGS. 1 and 2, the battery 10 includes a plurality of battery cells 20. The battery 10 may further include a case 11 having a hollow structure, in which the plurality of battery cells 20 are housed. FIG. 1 shows a possible embodiment of the case 11 according to an embodiment of the present application. As shown in FIG. 1, the case 11 may include two parts, referred to as a first case portion 111 and a second case portion 112, which are engaged with each other. The shapes of the first case portion 111 and the second case portion 112 are determined by the combined shape of the battery module 200, and at least one of the first case portion 111 and the second case portion 112 has an opening. For example, as shown in FIG. 1, the first case part 111 and the second case part 112 may both be hollow rectangular parallelepipeds, each with only one open side, with the opening of the first case part 111 and the opening of the second case part 112 being arranged opposite each other, and the first case part 111 and the second case part 112 engaging with each other to form a case 11 having a sealed cavity.

[0094] 1, for example, only one of the first case portion 111 and the second case portion 112 may be a hollow rectangular parallelepiped with an opening, and the other may be plate-shaped so as to cover the opening. For example, in the case where the second case portion 112 is a hollow rectangular parallelepiped with only one open surface and the first case portion 111 is plate-shaped, the first case portion 111 covers the opening of the second case portion 112, thereby forming a case 11 having a sealed cavity for accommodating multiple battery cells 20. The multiple battery cells 20 are combined by being connected in parallel, series, or series-parallel to each other, and then placed in the case 11 formed by engaging the first case portion 111 and the second case portion 112.

[0095] Optionally, the battery 10 may further include other structures, the description of which will be omitted here. For example, as shown in FIGS. 1 and 2 , the battery 10 may further include bus members 12 for realizing electrical connection between the plurality of battery cells 20, such as parallel connection, series connection, or series-parallel connection. Specifically, the bus members 12 may connect electrode terminals 214 of the battery cells 20 to realize electrical connection between the battery cells 20. Furthermore, the bus members 12 may be fixed to the electrode terminals 214 of the battery cells 20 by welding. Electrical energy of the plurality of battery cells 20 may further be extracted through the case 11 via a conductive mechanism.

[0096] The number of battery cells 20 in the battery 10 may be any number depending on different power demands. Multiple battery cells 20 may be connected in series, parallel, or series-parallel to achieve greater capacity or output. Because each battery 10 includes a relatively large number of battery cells 20, the battery cells 20 may be further divided into groups for ease of installation, with each group of battery cells 20 constituting a battery module. The number of battery cells 20 included in a battery module is not limited and may be installed as needed.

[0097] 3 is a schematic diagram of a partially exploded structure of a battery cell 20 according to an embodiment of the present application. For example, the battery cell 20 shown in FIG. 3 may be any of the battery cells 20 shown in FIGS. 1 and 2. As shown in FIGS. 2 and 3, the battery cell 20 according to the embodiment of the present application may include an outer casing 21. Specifically, the outer casing 21 may include a casing 211 having a hollow structure with at least one opening, a cover plate 212 for covering the opening of the casing, and an electrode assembly 22 housed within the outer casing 21.

[0098] As will be understood, the casing 211 according to the embodiment of the present application is a member for accommodating the electrode assembly 22, and the casing 211 may be a hollow structure having an opening at one or more ends. For example, if the casing 211 is a hollow structure having an opening at one end, one cover plate 212 may be installed, and if the casing 211 is a hollow structure having openings at both opposite ends, two cover plates 212 may be installed, and the two cover plates 212 respectively cover the openings at both ends of the casing 211.

[0099] The casing 211 may have various shapes, such as a cylinder, a rectangular parallelepiped, or other polyhedrons. For illustrative purposes, as shown in Figures 2 and 3, in the embodiments of the present application, the casing 211 is mainly a rectangular parallelepiped structure, and the casing 211 is a hollow structure with an opening formed at one end.

[0100] As can be understood, the cover plate 212 according to the embodiment of the present application is used as a member that covers the opening of the casing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the cover plate 212 may match the shape of the casing 211. As shown in Figures 2 and 3, the casing 211 has a rectangular parallelepiped structure and the cover plate 212 has a rectangular plate-like structure that matches the casing 211.

[0101] In the present embodiment, the casing 211 may be made of various materials such as copper, iron, aluminum, steel, aluminum alloy, etc. The cover plate 212 may be made of various materials such as copper, iron, aluminum, steel, aluminum alloy, etc. Optionally, the material of the cover plate 212 and the material of the casing 211 may be the same or different.

[0102] As will be understood, the battery cell 20 further includes electrode terminals 214. The electrode terminals 214 according to the embodiment of the present application are used to be electrically connected to the electrode assembly 22 inside the battery cell 20 so as to output electrical energy from the battery cell 20. As shown in FIGS. 2 and 3 , the battery cell 20 may include at least two electrode terminals 214, and the at least two electrode terminals 214 may include at least one positive electrode terminal 214a for electrically connecting with a positive electrode tab 222a of the electrode assembly 22 and at least one negative electrode terminal 214b for electrically connecting with a negative electrode tab 222b of the electrode assembly 22.

[0103] In some embodiments, the at least two electrode terminals 214 included in the battery cell 20 may be located on the same wall or on different walls. For example, although Figures 2 and 3 illustrate an example in which the two electrode terminals 214 are located on the same wall, the embodiments of the present application are not limited thereto.

[0104] As will be understood, the positive electrode terminal 214a and the positive electrode tab 222a may be directly or indirectly connected, and the negative electrode terminal 214b and the negative electrode tab 222b may be directly or indirectly connected. Illustratively, the positive electrode terminal 214a may be electrically connected to the positive electrode tab 222a via one connecting part, and the negative electrode terminal 214b may be electrically connected to the negative electrode tab 222b via one connecting part.

[0105] In the battery cell 20, the electrode assembly 22 is a component that causes an electrochemical reaction within the battery cell 20. Depending on the actual needs of use, one or more electrode assemblies 22 may be installed within the casing 211. For example, as shown in FIG. 3, two electrode assemblies 22 are installed within the battery cell 20. The electrode assembly 22 may be cylindrical, rectangular, or the like. When the electrode assembly 22 has a cylindrical structure, the casing 211 may also have a cylindrical structure. When the electrode assembly 22 has a rectangular structure, the casing 211 may also have a rectangular structure.

[0106] As will be understood, as shown in FIG. 3 , the electrode assembly 22 includes a tab 222 and an electrode main body 221, of which the tab 222 of the electrode assembly 22 may include a positive electrode tab 222a formed by stacking a portion of the positive electrode piece where a positive electrode active material layer is not applied, and a negative electrode tab 222b formed by stacking a portion of the negative electrode piece where a negative electrode active material layer is not applied, and the electrode main body 221 may be formed by stacking positive electrode pieces and negative electrode pieces on each other or by winding them.

[0107] As can be understood, the battery cell 20 may further include other components. For example, the battery cell 20 may further include a pressure release mechanism 213. The pressure release mechanism 213 may be located at any position of the battery cell 20. For example, as shown in FIG. 3 , the pressure release mechanism 213 may be located on the same wall as the electrode terminal 214, but the embodiment of the present application is not limited thereto.

[0108] The pressure release mechanism 213 refers to an element or component that is activated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. The design of the threshold varies depending on design requirements. The threshold may depend on one or more materials of the positive electrode pieces, negative electrode pieces, electrolyte, and separator film in the battery cell 20. The pressure release mechanism 213 may take the form of an explosion-proof valve, a gas valve, a pressure release valve, a safety valve, etc. Specifically, it may take the form of a pressure-sensitive element or pressure-sensitive structure or a temperature-sensitive element or temperature-sensitive structure. That is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure release mechanism 213 is activated or a fragile structure provided in the pressure release mechanism 213 is broken, thereby forming an opening or passage for releasing the internal pressure or temperature.

[0109] "Activation" in this application refers to the pressure release mechanism 213 being activated or being activated to a certain state, thereby releasing the pressure and temperature inside the battery cell 20. Actions caused by the pressure release mechanism 213 include, but are not limited to, at least a portion of the pressure release mechanism 213 being broken, crushed, torn, or opened. When activated, the pressure release mechanism 213 discharges high-temperature and high-pressure materials inside the battery cell 20 as exhaust from the activation point to the outside. In this way, the pressure and temperature of the battery cell 20 can be released at a controllable pressure or temperature, thereby avoiding the occurrence of potentially more serious accidents.

[0110] Emissions from the battery cell 20 according to the present application include, but are not limited to, electrolyte, dissolved or separated positive and negative electrode pieces, separator film fragments, high-temperature and high-pressure gases resulting from reactions, flames, etc.

[0111] The pressure release mechanism 213 in the battery cell 20 has an important effect on the reliability of the battery. For example, if a short circuit or overcharging occurs, thermal runaway may occur inside the battery cell 20, causing a sudden rise in pressure and temperature. In this case, the pressure release mechanism 213 operates to release the internal pressure and temperature to the outside, preventing the battery cell 20 from exploding or catching fire.

[0112] Fig. 4 shows a structural schematic diagram of an energy storage device 3 according to an embodiment of the present application, and Fig. 5 shows a side schematic view of the energy storage device 3 according to an embodiment of the present application, for example, Fig. 5 may be a left side schematic view of the energy storage device 3 shown in Fig. 4. As shown in Figs. 4 and 5, the energy storage device 3 according to an embodiment of the present application is for storing a plurality of batteries 10, and includes a first wall 31 and a pressure release assembly 32 installed on the first wall 31.

[0113] The energy storage device 3 according to the embodiment of the present application may have a hollow polyhedron structure, such as a cylindrical structure, and the interior of the energy storage device 3 may be used to store a plurality of batteries 10. The energy storage device 3 may include a plurality of walls, and the first wall 31 according to the embodiment of the present application may be any one of the walls of the energy storage device 3. Correspondingly, the first wall 31 may have any shape. For example, although the embodiment of the present application mainly exemplifies a rectangular first wall 31, the embodiment of the present application is not limited thereto.

[0114] 4 and 5, the energy storage device 3 may be, for example, a regular rectangular parallelepiped structure, in which the six sides of the rectangular parallelepiped are the six outer walls of the energy storage device 3. Installing the energy storage device 3 in a rectangular parallelepiped structure can facilitate the fixed placement and transportation of the energy storage device 3.

[0115] The inside of the energy storage device 3 is a hollow structure, which can be divided into multiple functional compartments according to actual needs. For example, the energy storage device 3 may include an energy storage compartment, a thermal management compartment, and a control compartment. The energy storage compartment may be used to store energy storage elements for providing electrical energy, such as multiple batteries 10. The thermal management compartment may be used to house thermal management components for regulating the temperature of the batteries 10 inside the energy storage device 3. The control compartment may be used to house a control box for managing or assisting the operation of components inside the energy storage device 3.

[0116] In some embodiments, the locations of the energy storage room, the thermal management room, and the control room within the energy storage device 3 may be set according to actual use. For example, as shown in Fig. 4, the energy storage room may be set on the right side of the energy storage device 3, and the thermal management room and the control room may be set on the left side along the height direction Z, or the thermal management room may be set above the control room, or an installation method different from that shown in Fig. 4 may be adopted.

[0117] In some embodiments, the present invention may include one or more pressure relief assemblies 32. When the energy storage device 3 includes multiple pressure relief assemblies 32, the multiple pressure relief assemblies 32 may be located in different positions on the same wall or on different walls.

[0118] In an embodiment of the present application, the energy storage device 3 stores multiple batteries 10 therein, and if at least one of the batteries 10 experiences thermal runaway, when the pressure or temperature inside the energy storage device 3 rises and reaches a predetermined threshold, the pressure release assembly 32 is activated to release the pressure or temperature inside the energy storage device 3, thereby improving the reliability of the energy storage device 3 while reducing the possibility of thermal diffusion between the multiple batteries 10 inside the energy storage device 3.

[0119] 4 and 5, three mutually perpendicular directions are defined based on the placement position of the energy storage device 3, and the three directions include a length direction X, a width direction Y, and a height direction Z of the energy storage device 3. Specifically, the width direction Y of the energy storage device 3 may be a direction perpendicular to the cabinet door 391 of the energy storage device 3, and the height direction Z of the energy storage device 3 may be a direction parallel to the direction of gravity.

[0120] 4 and 5 , the first wall 31 according to the embodiment of the present application is the top wall of the energy storage device 3. The top wall is a wall perpendicular to the height direction Z of the energy storage device 3, and is located above the energy storage device 3 when the energy storage device 3 is placed upright. In this way, when the pressure release assembly 32 of the first wall 31 is activated, the discharged matter inside the energy storage device 3 can be discharged upward through the broken pressure release assembly 32, i.e., in the direction opposite to the direction of gravity. This reduces damage to personnel or components in the surrounding environment caused by the high-temperature and high-pressure discharged matter from the energy storage device 3 and improves reliability compared to when the first wall 31 is located on another wall.

[0121] In the embodiment of the present application, the top wall may further include other structures.

[0122] In some embodiments, the top wall is provided with a reinforcing rib 35 to enhance the structural strength of the top wall. For example, during use of the energy storage device 3, rainwater or other materials may accumulate on the top wall, causing the load-bearing capacity of the top wall to increase. The reinforcing rib 35 can increase the load-bearing capacity of the top wall, reduce the possibility of the top wall collapsing or breaking, and further improve the service life of the top wall, which in turn improves the service life of the energy storage device 3.

[0123] The distribution, number, shape, and size of the reinforcing ribs 35 according to the embodiment of the present application can be determined according to actual use. For example, as shown in Figures 4 and 5, the top wall may include multiple reinforcing ribs 35, and the shapes and sizes of the different reinforcing ribs 35 may be the same or different. For example, reinforcing ribs 35 of different shapes and sizes may be provided to rationally utilize the space on the top wall. For example, the shape of the reinforcing ribs 35 according to the embodiment of the present application may include annular, rectangular, circular, trapezoidal, or other shapes.

[0124] Furthermore, the surface of the pressure release assembly 32 that faces away from the inside of the energy storage device 3 may or may not have a reinforcing rib 35. For example, in Figures 4 and 5, the surface of the pressure release assembly 32 that faces away from the inside of the energy storage device 3 does not have a reinforcing rib 35, but the embodiments of the present application are not limited to this.

[0125] The installation manner of the reinforcing ribs 35 according to the embodiments of the present application can be flexibly set according to the actual use. For example, the reinforcing ribs 35 may be a protruding structure that protrudes from the surface of the top wall away from the interior of the energy storage device 3. This can increase the structural strength of the top wall, while the protruding portion can also reduce the accumulation of rainwater on the top wall and reduce the load-bearing capacity of the top wall.

[0126] In some embodiments, the top wall may further include an extension structure 36 located on at least a portion of the edge of the top wall. Specifically, as shown in FIGS. 4 and 5 , the extension structure 36 is provided on at least a portion of the edge of the top wall, extending beyond the corresponding side wall along the width direction Y or the length direction X. For example, taking a rectangular first wall 31 as an example, the first wall 31 includes four sides. For example, an extension structure 36 extending beyond the corresponding wall along the width direction X may be provided on one of the four sides parallel to the length direction X. Considering that the top wall and the other walls of the energy storage device 3 are not typically formed as a single unit, gaps may exist at the intersections between the top wall and the other walls. By providing the extension structure 36, the gaps between the top wall and the other walls can be covered and shielded, thereby reducing the impact of the external environment on the interior of the energy storage device 3. For example, this can reduce the intrusion of rainwater into the energy storage device 3 through gaps between the top wall and the other walls, thereby improving the reliability of the energy storage device 3.

[0127] In some embodiments, the energy storage device 3 includes a cabinet body 392 and a cabinet door 391, and the extension structure 36 is installed on the side of the top wall adjacent to the cabinet door 391, thereby reducing the probability of rainwater entering the interior of the energy storage device 3.

[0128] In some embodiments, the top wall may further include a fire extinguishing pipe connection port 37 for connecting an external fire extinguishing pipe in the event of thermal runaway of the batteries 10 inside the energy storage device 3. For example, the fire extinguishing pipe connection port 37 may be connected to a water pipe to reduce the temperature inside the energy storage device 3 and extinguish a fire.

[0129] In some embodiments, the energy storage device 3 may further include other structures. For example, as shown in FIGS. 4 and 5 , the energy storage device 3 may further include a ventilation structure 38 located on any wall of the energy storage device 3, which can discharge heat inside the energy storage device 3 to the outside and reduce the temperature inside the energy storage device 3, thereby improving the reliability of the batteries 10 therein. Specifically, the ventilation structure 38 can be realized in various forms. For example, the ventilation structure 38 may include, but is not limited to, a louver or a mesh.

[0130] Fig. 6 shows a schematic top view of a first wall 31 according to an embodiment of the present application, which may be, for example, the top wall of the energy storage device 3 shown in Figs. 4 and 5. Fig. 7 shows a schematic cross-sectional view of the first wall 31 according to an embodiment of the present application, which is, for example, a cross-sectional view taken along the A-A' direction shown in Fig. 6, and the cross section shown in Fig. 7 is perpendicular to the width direction Y.

[0131] As shown in Figures 6 and 7, the outer surface of the top wall of the embodiment of the present application that faces away from the inside of the energy storage device 3 may be a plane perpendicular to the height direction Z, i.e., a plane parallel to the horizontal plane, or a plane inclined relative to the horizontal plane.

[0132] In some embodiments, the surface of the top wall facing away from the interior of the energy storage device 3 is inclined in the direction of gravity from the central region toward the edge region. Specifically, as shown in FIGS. 5 and 6 , if the surface of the top wall facing away from the interior of the energy storage device 3 is the outer surface of the top wall, the outer surface of the top wall is not perpendicular to the height direction Z but is inclined relative to the height direction Z. For example, along the height direction Z, the central region of the outer surface of the top wall is relatively high, and the edge regions of the outer surface of the top wall are relatively low, resulting in a gradually inclined outer surface of the top wall. In this way, when substances from the external environment, such as rainwater, fall onto the outer surface of the top wall, they can slide down along the inclined outer surface of the top wall due to gravity, reducing the accumulation of substances such as rainwater on the outer surface of the top wall, reducing the load-bearing capacity of the top wall, and further improving the service life of the top wall and the energy storage device 3.

[0133] In some embodiments, the inclined outer surface of the top wall can be realized in various forms. For example, as shown in Figures 6 and 7, the outer surface of the top wall is rectangular. The outer surface of the top wall, excluding the area where the middle pressure release assembly 32 is located, is divided into four planes along diagonals, and the intersection lines of the four planes are the ridges of the outer surface of the top wall, so that the outer surface of the top wall forms four intersecting inclined planes. Also, unlike Figures 6 and 7, the outer surface of the top wall may not have ridges. For example, the outer surface of the top wall may be an outer surface of a roughly conical structure, which makes the outer surface of the top wall smoother. However, the present invention is not limited to this example.

[0134] Similarly, the surface of the pressure release assembly 32 installed on the first wall 31 that faces away from the energy storage device 3 may be installed in a plane perpendicular to the height direction Z, i.e., may be a plane parallel to the horizontal plane, or may be a plane inclined relative to the horizontal plane. For example, if the region where the pressure release assembly 32 is located is located in the central region of the first wall 31, the surface of the pressure release assembly 32 that faces away from the energy storage device 3 may be installed so as to be parallel to the horizontal plane, as shown in Figures 6 and 7. Alternatively, for example, unlike Figures 6 and 7, the surface of the pressure release assembly 32 that faces away from the energy storage device 3 may be inclined relative to the horizontal plane.

[0135] For example, Fig. 8 shows another schematic top view of the first wall 31 according to an embodiment of the present application. Comparing Fig. 8 with Fig. 6, one or more reinforcing ribs 35 may be further provided on a surface of the first wall 31 that faces away from the interior of the energy storage device 3 of the pressure release assembly 32 to increase the structural strength of the pressure release assembly 32. Specifically, the reinforcing ribs may be provided on the cover 322 of the pressure release assembly 32. The cover 322 of the pressure release assembly 32 will be described later.

[0136] 8 , the surface of the pressure relief assembly 32 facing away from the energy storage device 3 may be sloped in the direction of gravity from its center toward its edge region to reduce substances from the external environment, such as rainwater, falling on the surface of the pressure relief assembly 32 facing away from the energy storage device 3, allowing the substances to slide down the sloped surface due to gravity, reducing the pressure on the pressure relief assembly 32 and further improving the reliability of the pressure relief assembly 32. Specifically, the surface of the pressure relief assembly 32 facing away from the energy storage device 3 may be the surface of a cover 322 of the pressure relief assembly 32. The cover 322 of the pressure relief assembly 32 will be described below.

[0137] The inclined surface of the pressure release assembly 32 facing away from the energy storage device 3 can be realized in various forms. For example, as shown in FIG. 8 , the surface of the pressure release assembly 32 facing away from the energy storage device 3 is rectangular. Like other regions of the first wall 31, the surface of the pressure release assembly 32 facing away from the energy storage device 3 is divided into four planes along diagonals, or the region excluding the central region is divided into four planes along diagonals, so that the surface of the pressure release assembly 32 forms four intersecting inclined surfaces, and the intersection lines of the four planes are the ridges of the surface of the pressure release assembly 32. Also, for example, unlike FIG. 8 , the surface of the pressure release assembly 32 may not have ridges. For example, the surface of the pressure release assembly 32 may be the outer surface of a substantially conical structure, so that the outer surface of the top wall is smoother. However, the embodiment of the present application is not limited thereto.

[0138] As will be appreciated, the pressure relief assembly 32 and the first wall 31 of the present embodiment may be a unitary structure or may be separate structures. For example, if the pressure relief assembly 32 and the first wall 31 are a unitary structure, the pressure relief assembly 32 may include a notch or other frangible structure disposed in the first wall 31 so that, when the pressure or temperature within the energy storage device 3 reaches a predetermined threshold, the pressure relief assembly 32 is easily broken to release the pressure or temperature within the energy storage device 3. Specifically, if the first wall 31 includes a multi-layer structure, the pressure relief assembly 32 may include a notch disposed in each layer.

[0139] Furthermore, for example, the pressure release assembly 32 and the first wall 31 may be separate structures. Hereinafter, with reference to the drawings, a specific example in which the pressure release assembly 32 and the first wall 31 are separate structures will be described.

[0140] 9 and 10 respectively show different partial cross-sectional schematic views of the first wall 31 according to an embodiment of the present application, where Fig. 9 is an enlarged view of region B in the cross-sectional view shown in Fig. 7 and Fig. 10 is an enlarged view of region C in the cross-sectional view shown in Fig. 7. Fig. 11 shows a partial cross-sectional schematic view of the first wall 31 according to an embodiment of the present application, and for example, the difference between the first wall 31 shown in Fig. 11 and the first walls 31 shown in Figs. 6 and 7 is that the first wall 31 shown in Fig. 11 does not include a pressure release assembly 32.

[0141] 9 to 11, a through-hole 311 is provided in the first wall 31, and the pressure release assembly 32 covers the through-hole 311. By providing the through-hole 311 in the first wall 31 and then having the pressure release assembly 32 cover the through-hole 311, the first wall 31 and the pressure release assembly 32 can be installed as separate structures. The separate installation method makes the structure of the pressure release assembly 32 more flexible and can more easily meet the design requirements for pressure release of the energy storage device 3.

[0142] In the embodiment of the present application, an adapter member 33 for connecting the first wall 31 and the pressure relief assembly 32 is installed around the through-hole 311 of the first wall 31. By installing a specific adapter member 33 for fixed connection between the first wall 31 and the pressure relief assembly 32, the connection and sealing requirements between the first wall 31 and the pressure relief assembly 32 can be better met.

[0143] In the embodiment of the present application, the adapter member 33 protrudes from the surface of the first wall 31 that faces away from the interior of the energy storage device 3. When the adapter member 33 protrudes from the outer surface of the first wall 31, the connection portion between the adapter member 33 and the pressure release assembly 32 may also protrude from the outer surface of the first wall 31. This increases the height of the connection portion between the adapter member 33 and the pressure release assembly 32 along the height direction Z and reduces mutual influence with components inside the first wall 31, while also increasing the height of the connection interface between the adapter member 33 and the pressure release assembly 32 and improving the sealing of the connection interface.

[0144] 9 to 11, the adapter member 33 forms an accommodation space 334, and the adapter member 33 and the pressure release assembly 32 are connected by a first connecting member 301, and the accommodation space 334 is used to accommodate at least a portion of the first connecting member. The adapter member 33 may be used to form the accommodation space 334, and at least a portion of the first connecting member 301 between the adapter member 33 and the pressure release assembly 32 may be located within the accommodation space 334, i.e., at least a portion of the first connecting member 301 may be located at a specific position, which can reduce the influence of the first connecting member 301 on other members and facilitate installation.

[0145] 9 to 11, in some embodiments, the adapter member 33 includes a groove in which an accommodating space 334 is formed, and the opening of the groove faces away from the center of the through-hole 311. On the one hand, realizing the accommodating space 334 by the groove is simple in structure and easy to implement. On the other hand, if the bottom wall of the groove is installed closer to the center of the through-hole 311, that is, closer to the center of the pressure relief assembly 32, and the first connecting member 301 between the pressure relief assembly 32 and the adapter member 33 is installed on the side wall of the groove, the bottom wall of the groove will play a supporting role and bear part of the acting force of the pressure relief assembly 32, further increasing the structural strength of the pressure relief assembly 32. On the other hand, since the distance between the first connecting member 301 and the bottom wall of the groove needs to meet the sealing and strength requirements, installing the bottom wall of the groove closer to the center of the through-hole 311 can reduce the area of ​​the first wall 31 occupied by the adapter member 33 and the pressure relief assembly 32 and reduce the space occupied by the adapter member 33 and the pressure relief assembly 32, thereby making the structure more compact.

[0146] In some embodiments, the adapter member 33 and the first wall 31 are of one-piece construction, which may improve the seal between the adapter member 33 and the first wall 31 .

[0147] 9 to 11, the adapter member 33 and the first wall 31 are installed separately, and the adapter member 33 and the first wall 31 are connected by a second connecting member 302. Specifically, FIG. 12 shows a schematic structural view of the adapter member 33 according to an embodiment of the present application. As shown in FIGS. 9 to 12, by installing the adapter member 33 and the first wall 31 separately, the complexity of the structure of the first wall 31 can be reduced and the processing of the adapter member 33 can be facilitated.

[0148] 9 to 12, the adapter member 33 includes a first portion 331, a second portion 332, and a third portion 333. The second portion 332 is used to connect the opposing first portion 331 and the third portion 333. The first portion 331, the second portion 332, and the third portion 333 are surrounded by each other to form an accommodating space 334. The first portion 331 is connected to the pressure release assembly 32 via the first connecting member 301. The accommodating space 334 is used to accommodate at least a portion of the first connecting member 301. The third portion 333 is connected to the first wall 31 by the second connecting member 302. The first portion 331, the second portion 332, and the third portion 333 are arranged to form a groove-shaped adapter member 33 having the accommodating space 334, which has a simple structure and is easy to implement.

[0149] As can be understood, the connection method between the adapter member 33 and the first wall 31 in the embodiments of the present application can be flexibly set according to actual use, and the connection method between the adapter member 33 and the pressure release assembly 32 can also be flexibly set according to actual use, and the connection method between the adapter member 33 and the first wall 31 and the connection method between the adapter member 33 and the pressure release assembly 32 can be the same or different.

[0150] For example, the first connecting member 301 includes a rivet joint structure 3011 and / or a bolt structure 3012, and the first connecting member 301 penetrates the pressure release assembly 32 and the first portion 331, resulting in a simple structure and easy implementation. Specifically, the first portion 331 may include a plurality of through holes, which may be correspondingly provided in corresponding portions of the pressure release assembly 32. The rivet joint structure 3011 and / or the bolt structure 3012 penetrate the first portion 331 through the through holes of the first portion 331 and simultaneously penetrate a portion of the pressure release assembly 32 through the through holes of the pressure release assembly 32, so as to fixedly connect the first portion 331 and the pressure release assembly 32. Furthermore, the first connecting member 301 may further include other structures, for example, the first connecting member 301 may further include a gasket 3013 to improve structural strength and stability.

[0151] As can be understood, the bolt structure 3012 according to the embodiments of the present application may be used in combination with a nut, for example, a rivet nut, and the riveting structure 3011 may include a rivet or a riveting block, for example, the riveting structure 3011 may be a rivet nut, so that the pressure release assembly 32 and the first part 331 are riveted together by the riveting structure 3011, but the embodiments of the present application are not limited thereto.

[0152] In some embodiments, when multiple through holes are provided in the first part 331, cutout areas 335 may be provided between the multiple through holes in the first part 331, and these cutout areas 335 can substantially ensure the fixed connection requirements of the first connecting member 301 without fixedly attaching the first connecting member 301, and at the same time, can reduce the weight of the adapter member 33 and further reduce the load-bearing capacity of the first wall 31, thereby improving the service life of the first wall 31.

[0153] In some embodiments, the adapter member 33 and the first wall 31 may be fixed together by welding or adhesive, and welding will be described as an example here. Specifically, the second connecting member 302 includes a weld seam 3021 formed by welding the third portion 333 to the first wall 31. The third portion 333 and the first wall 31 are fixed together by welding, which can improve the sealing performance and structural stability between the third portion 333 and the first wall 31. For example, as shown in FIGS. 9 to 12 , if the adapter member 33 has a rectangular outer contour, the rectangular weld seam 3021 between the adapter member 33 and the first wall 31 can improve the sealing performance between the adapter member 33 and the first wall 31.

[0154] Furthermore, the second connecting member 302 includes a sealing member 3022 installed at the weld seam 3021. The sealing member further seals the weld seam 3021, thereby further improving the sealing between the adapter member 33 and the first wall 31. The sealing member 3022 can be implemented in various forms. For example, the sealing member 3022 can include a sealant, or the sealant can be applied along the weld seam 3021, for example, the sealant can cover the weld seam 3021, so as to further improve the sealing between the adapter member 33 and the first wall 31.

[0155] 9 to 12 , a protruding structure 312 that protrudes away from the interior of the energy storage device 3 is provided around the through-hole 311 of the first wall 31. On the one hand, the protruding structure 312 can position the adapter member 33, facilitating the positioning and installation of the adapter member 33. On the other hand, the protruding structure 312 can further improve the connection interface between the pressure release assembly 32 and the adapter member 33, thereby improving the sealing performance.

[0156] 9 to 12, the weld seam 3021 is located on the protruding structure 312. Because the protruding structure 312 is installed so as to protrude, external environmental substances such as rainwater are less likely to accumulate on the protruding structure 312, which prevents the weld seam 3021 from being affected by these substances and further improves the sealing performance of the weld seam 3021.

[0157] In the present embodiment, the energy storage device 3 further includes a support structure 34 corresponding to the pressure release assembly 32 and located on the side of the pressure release assembly 32 facing the interior of the energy storage device 3. Because the pressure release assembly 32 can instantly release when the temperature or pressure inside the energy storage device 3 reaches a predetermined threshold, the structural strength of the pressure release assembly 32 is typically less than the structural strength of other areas of the first wall 31, making the pressure release assembly 32 more easily broken, opened, or damaged during normal use of the energy storage device 3. Therefore, the support structure 34 can support the pressure release assembly 32 on the side of the pressure release assembly 32 closest to the energy storage device 3, which reduces the possibility of the pressure release assembly 32 collapsing or failing if the external load on the energy storage device 3 is too large when the energy storage device 3 is used normally, improves the structural strength of the pressure release assembly 32, reduces the impact on the operation of the pressure release assembly 32 if thermal runaway occurs within the energy storage device 3, and allows the pressure release assembly 32 to instantly release the temperature or pressure inside the energy storage device 3, thereby improving the reliability of the energy storage device 3.

[0158] As will be understood, the position of the support structure 34 according to the embodiment of the present application can be flexibly set according to actual use. For example, as shown in Figures 9 to 12, the support structure 34 is connected to the inner wall of the through-hole 311, and at least a portion of the support structure 34 is located inside the through-hole 311. By setting the support structure 34 so that at least a portion of the support structure 34 is located inside the through-hole 311, it is possible to save space and also to reduce the distance between the support structure 34 and the pressure relief assembly 32 in order to enhance the supporting effect of the support structure 34 on the pressure relief assembly 32.

[0159] As will be appreciated, the support structure 34 according to the present embodiment can be implemented in a variety of forms, and the number of support structures 34 may be one or more.

[0160] For example, as shown in Figure 12, the support structure 34 includes at least two intersecting support strips, which allow the at least two support strips to extend along different directions, further increasing the structural strength in multiple directions.

[0161] When the number of support structures 34 is plural, two support strips that cross each other may be connected by welding, engaging, adhesive, bolting, or the like.

[0162] Furthermore, for example, as shown in Figures 9 to 12, by installing at least one first support strip 341 extending along the length direction X and at least one second support strip 342 extending along the width direction Y, the at least one first support strip 341 and the at least one second support strip 342 intersect each other and become perpendicular, thereby increasing the structural strength in the length direction X and the width direction Y, and further improving the structural stability of the entire first wall 31.

[0163] Also, for example, to facilitate processing and assembly, at least two support strips extending along the same direction may be provided, i.e., the at least two support strips are parallel to each other, but the embodiments of the present application are not limited thereto.

[0164] The pressure release assembly 32 according to the embodiment of the present application will be described in detail below with reference to the drawings. Fig. 13 is an exploded structural schematic view of the pressure release assembly 32 according to the embodiment of the present application and the adapter member 33. As shown in Fig. 13, the pressure release assembly 32 according to the embodiment of the present application may include a pressure release tab 321.

[0165] 14 is a schematic top view of a pressure release tab 321 according to an embodiment of the present application. As shown in FIGS. 13 to 14, the pressure release assembly 32 includes a pressure release tab 321 having a weakened area 3211. In this manner, when the pressure or temperature inside the energy storage device 3 reaches a predetermined threshold, the weakened area 3211 of the pressure release tab 321 is easily broken, causing the pressure release tab 321 to be rapidly released. This allows high-temperature, high-pressure wastewater inside the energy storage device 3 to be rapidly discharged from the energy storage device 3 through the through-holes 311 and the broken pressure release tab 321, thereby reducing the possibility of the energy storage device 3 exploding and improving the reliability of the energy storage device 3.

[0166] In the embodiment of the present application, the edge region 3212 of the pressure release tab 321 is connected to the first wall 31, and the weakened region 3211 is located on at least a portion of the edge region 3212 of the pressure release tab 321, closer to the center of the pressure release tab 321. Specifically, as shown in FIGS. 13 and 14 , the edge region 3212 of the pressure release tab 321 may have a plurality of through-holes so that the first connecting member 301 can easily penetrate the pressure release tab 321 through the through-holes in the edge region 3212, thereby firmly connecting the pressure release tab 321 to the first wall 31. For example, the first connecting member 301 may firmly connect the pressure release tab 321 to the adapter member 33, and the fixed connection between the adapter member 33 and the first wall 31 may indirectly achieve the fixed connection between the pressure release tab 321 and the first wall 31; however, the embodiment of the present application is not limited thereto.

[0167] 13 and 14 , by providing the weakened region 3211 in at least a part of the edge region 3212, when the pressure or temperature inside the energy storage device 3 reaches a predetermined threshold, at least a part of the edge region 3212 can be destroyed, and high-temperature, high-pressure effluent inside the energy storage device 3 can be immediately discharged from the destroyed region. Furthermore, because the weakened region 3211 is located in the edge region 3212, the area surrounded by the weakened region 3211 is relatively large. Therefore, when the pressure release tab 321 is destroyed, the area opened by the pressure release tab 321 is large, and high-temperature, high-pressure effluent inside the energy storage device 3 can be discharged more quickly, further reducing the possibility of an explosion and improving reliability.

[0168] In some embodiments, a portion of the edge region 3212 of the pressure release tab 321 does not have the weakened region 3211. For example, as shown in Figures 13 and 14, a portion of the edge region 3212 of the pressure release tab 321 does not have the weakened region 3211. Therefore, if the edge region 3212 where the weakened region 3211 is provided is broken, the pressure release tab 321 is released from the weakened region 3211, and the edge region 3212 where the weakened region 3211 is not provided can remain connected. That is, by bending the pressure release tab 321 at the edge region 3212 where the weakened region 3211 is not provided, high-temperature and high-pressure discharged matter inside the energy storage device 3 can be immediately released from the released region, and the structural integrity of the pressure release tab 321 can be maintained as much as possible, thereby minimizing the risk of localized regions of the pressure release tab 321 scattering and causing damage to other structures or personnel.

[0169] As will be understood, the weakened region 3211 according to the embodiments of the present application can be realized in various forms. For example, as shown in FIGS. 13 and 14 , the weakened region 3211 includes a notch in which the opening of the pressure release tab 321 faces away from the interior of the energy storage device 3. When the pressure or temperature inside the energy storage device 3 reaches a predetermined threshold, the pressure release tab 321 is easily broken at the notch because the thickness at the notch is thin. Furthermore, because the opening of the notch faces away from the interior of the energy storage device 3, the pressure release tab 321 is immediately opened, allowing the high-temperature, high-pressure exhaust inside the energy storage device 3 to be easily broken through the pressure release tab 321. Furthermore, for example, the weakened region 3211 may include a temperature-sensitive material or a pressure-sensitive material, and the temperature-sensitive material or the pressure-sensitive material may be further disposed in at least a portion of the pressure release tab 321 to form the weakened region 3211; however, the embodiments of the present application are not limited thereto.

[0170] In the present embodiment, other structures may be further provided on the pressure release tab 321. For example, as shown in Figures 13 and 14, the pressure release tab 321 may further include a first positioning notch 3213 for positioning the pressure release tab 321 when attached.

[0171] As will be understood, the position of the first positioning notch 3213 can be flexibly set according to actual use. For example, the first positioning notch 3213 does not pass through the center line of the edge of the pressure release tab 321 on which the first positioning notch 3213 is located. Specifically, as shown in FIGS. 13 and 14 , taking the rectangular pressure release tab 321 as an example, the first positioning notch 3213 may be located on any edge. In the embodiments of the present application, the edge refers to any edge or edge line of the pressure release tab 321. For example, the first positioning notch 3213 may be located on the left edge, and the first positioning notch 3213 may be located at the bottom end of the left edge as shown in FIGS. 13 and 14 without passing through the center line of the edge. In this way, when installing the pressure release tab 321, the first positioning notch 3213 may be set in a predetermined position. For example, as shown in FIGS. 13 and 14 , the first positioning notch 3213 may be located at the bottom end of the left edge rather than at another position, by visually recognizing it with the installer or by installing a device to intelligently recognize the first positioning notch 3213, so as to avoid incorrect installation of the opposing surfaces of the pressure release tab 321. For example, if the first positioning notch 3213 is incorrectly installed at the top end of the left edge during installation, both surfaces of the pressure release tab 321 will be incorrectly installed. For example, because the opening of the notch of the pressure release tab 321 usually needs to face the outside of the energy storage device 3, the first positioning notch 3213 can minimize the risk of installing the pressure release tab 321 with the notch opening facing the outside, thereby improving installation efficiency.

[0172] Also, for example, a first positioning notch 3213 is provided in the edge region 3212 where the weakened region 3211 of the pressure release tab 321 is not provided. The first positioning notch 3213 determines the position of the edge region 3212 where the weakened region 3211 is not provided, thereby making it possible to determine the position of the weakened region 3211 of the pressure release tab 321, and furthermore, when the pressure release tab 321 is broken, it opens along a specific direction, and the discharged material inside the energy storage device 3 is discharged facing a specific direction, thereby reducing the impact of the high-temperature, high-pressure discharged material on the outside.

[0173] As will be understood, as shown in Figures 13 and 14, the pressure release assembly 32 according to the embodiment of the present application may further include a cover 322. Figure 15 shows a structural schematic diagram of the cover 322 according to the embodiment of the present application, Figure 16 shows a schematic top view of the cover 322 according to the embodiment of the present application, and Figure 17 shows a schematic side view of the cover 322 according to the embodiment of the present application, and all of the covers 322 shown in Figures 15 to 17 may be the cover 322 included in the pressure release assembly 32 shown in Figure 13.

[0174] 15 to 17, the pressure release assembly 32 is located on the side of the pressure release tab 321 that faces away from the inside of the energy storage device 3, and includes a cover 322 that covers the pressure release tab 321. Because the structural strength of the pressure release tab 321 is insufficient, installing the cover 322 on the side of the pressure release tab 321 that faces away from the inside of the energy storage device 3 can protect the pressure release tab 321, reduce the impact of the external environment of the energy storage device 3 on the pressure release tab 321, improve the stability of the pressure release tab 321 during normal use of the energy storage device 3, and prevent early failure of the pressure release tab 321 as much as possible.

[0175] The structure of the cover 322 according to the embodiment of the present application can be flexibly set according to actual use. For example, as shown in FIGS. 15 to 17 , the cover 322 has a groove structure with an opening facing the pressure release tab 321, and an extension portion 3222 is provided in a portion of the side wall 3221 of the cover 322, extending from an end of the side wall 3221 close to the opening in a direction away from the side wall 3221. The extension portion 3222 is used to connect the side wall 3221 of the cover 322 to the first wall 31. By providing the extension portion 3222 in a portion of the side wall 3221 of the cover 322 and fixing the extension portion 3222 to the first wall 31, a portion of the side wall 3221 of the cover 322 is fixed to the first wall 31, i.e., a portion of the side wall 3221 is not fixed to the first wall 31. In this way, during normal use of the energy storage device 3, the cover 322 can cover the surface of the pressure release tab 321 by gravity to protect the pressure release tab 321, and if the battery 10 inside the energy storage device 3 experiences thermal runaway, the pressure release tab 321 will be destroyed, and the waste inside the energy storage device 3 will be discharged through the pressure release tab 321, and then can be immediately discharged to the outside of the energy storage device 3 through the area of ​​the side wall 3221 of the cover 322 that is not fixed to the first wall 31, so as to prevent the energy storage device 3 from exploding as much as possible.

[0176] For example, taking the rectangular cover 322 as an example, the extension 3222 may be located on one side of the cover 322, and the side of the cover 322 where the extension 3222 is installed may be fixed to the first wall 31. When the battery 10 inside the energy storage device 3 experiences thermal runaway, the pressure release tab 321 is broken, and the waste inside the energy storage device 3 is discharged through the pressure release tab 321. After that, the three side walls 3221 where the extension 3222 of the cover 322 is not installed may be separated from the first wall 31 under the action of the waste; for example, the cover 322 may be bent in the region of the extension 3222, so that the cover 322 is opened and the waste can be immediately discharged, thereby minimizing the risk of explosion of the energy storage device 3.

[0177] As can be understood, the extension portion 3222 according to the embodiment of the present application may be used to connect the cover 322 and the first wall 31. For example, the extension portion 3222 and the first wall 31 are connected by a first connecting member 301. Specifically, the extension portion 3222 is connected to a part of the side wall 3221 of the cover 322, and a plurality of through holes may be provided in the extension portion 3222, and the first connecting member 301 penetrates the through holes of the extension portion 3222 to fix the extension portion 3222 and the first wall 31 to each other. For example, the first connecting member 301 may penetrate the adapter member 33 and the extension portion 3222, respectively, to connect and fix the adapter member 33 and the extension portion 3222 to each other, which has a simple structure and is easy to implement. Furthermore, since the adapter member 33 is connected to the first wall 31, the extension portion 3222 is further indirectly connected to the first wall 31, but the embodiment of the present application is not limited to this.

[0178] 15 to 17, in the embodiment of the present application, the extension portion 3222 corresponds to the side where the weakened area 3211 of the pressure release tab 321 is not provided. In this way, when the pressure or temperature inside the energy storage device 3 reaches a predetermined threshold, the opening direction of the pressure release tab 321 coincides with the opening direction of the cover 322, reducing the obstacle to the discharged matter, thereby allowing the discharged matter inside the energy storage device 3 to be quickly and smoothly discharged from the energy storage device 3 and improving the reliability of the energy storage device 3.

[0179] In some embodiments, the extension 3222 is provided with a second locating notch 3223 that is located corresponding to the first locating notch 3213, thereby realizing alignment between the extension 3222 and the pressure release tab 321. For example, when the first locating notch 3213 is located on the side of the pressure release tab 321 where the weakened area 3211 is not located, the second locating notch 3223 can be used to locate the extension 3222 on the side of the pressure release tab 321 where the weakened area 3211 is not located, thereby improving installation efficiency.

[0180] It should be understood that in addition to connecting the cover 322 and the first wall 31 by the extension 3222, they may also be fixed in other ways. For example, FIG. 18 shows another schematic top view of the cover 322 according to an embodiment of the present application. As shown in FIG. 18, the cover 322 has a groove structure with an opening facing the pressure release tab 321, and a portion of the side wall 3221 of the cover 322 is rotatably connected to the first wall 31 by the third connecting member 303. Specifically, unlike the technical solution in which the extension 3222 is installed on the side wall 3221 of the cover 322, the rotatable connection between the side wall 3221 of the cover 322 and the first wall 31 can be achieved by the third connecting member 303. In this way, during normal use of the energy storage device 3, the cover 322 can cover the surface of the pressure release tab 321 by gravity to protect the pressure release tab 321. If the battery 10 inside the energy storage device 3 experiences thermal runaway, the pressure release tab 321 will be destroyed and the waste material inside the energy storage device 3 will be discharged through the pressure release tab 321. Then, the cover 322 will be rotated and opened by the third connecting member 303 installed on the side wall 3221, so that the waste material can be immediately discharged to the outside of the energy storage device 3 to prevent explosion of the energy storage device 3 as much as possible.

[0181] It should be understood that the third connecting member 303 according to the embodiment of the present application can be flexibly installed according to actual use. For example, the third connecting member 303 may include a hinge to realize a rotatable connection. Specifically, a part of the hinge is connected to the side wall 3221 of the cover 322, and another part of the hinge is connected to the adapter member 33 or the first wall 31 so that the cover 322 and the first wall 31 can rotate relative to each other under the action of the hinge. Also, for example, to stabilize the structure of the cover 322, multiple third connecting members 303 may be installed on one side of the cover 322. The embodiment of the present application is not limited thereto.

[0182] For convenience of explanation, the embodiment of the present application will be mainly described in detail using an embodiment in which the cover 322 includes the extension portion 3222 as an example.

[0183] As will be understood, the pressure release assembly 32 according to the embodiment of the present application may further include an edge structure 323. Figure 19 shows a structural schematic diagram of the edge structure 323 according to the embodiment of the present application, Figure 20 shows a schematic top view of the edge structure 323 according to the embodiment of the present application, and Figure 21 shows a schematic side view of the edge structure 323 according to the embodiment of the present application, and the edge structures 323 shown in Figures 19 to 21 may all be the edge structures 323 included in the pressure release assembly 32 shown in Figure 13.

[0184] As shown in Figures 19 to 21, the pressure release assembly 32 includes an edge structure 323 that is installed to surround the edge of the cover 322, and the edge structure 323 includes a fourth portion 3231 and a fifth portion 3232 that are connected to each other and bent relatively, the fourth portion 3231 being located inside the groove structure, and the fifth portion 3232 being located between the extension portion 3222 and the first wall 31 and connected to the first wall 31.

[0185] 9 and 10 , the cover 322 has some areas that are not directly connected to the first wall 31 or the adapter member 33, and therefore there is a gap between the edge of the cover 322 and the first wall 31 or the adapter member 33. This gap may allow substances from the external environment to enter the inside of the energy storage device 3 and further affect devices inside the energy storage device 3. For example, rainwater may enter the energy storage device 3 and affect the pressure release assembly 32. Therefore, an edge structure 323 may be provided on the edge of the cover 322. The edge structure 323 includes a fourth portion 3231 and a fifth portion 3232 that are bent relatively. The edge structure 323 may surround the edge of the cover 322 to reduce substances from the external environment from entering the energy storage device 3 through the gap at the edge of the cover 322. For example, by effectively reducing the intrusion of rainwater into the energy storage device 3, the internal components of the energy storage device 3 may be protected and the reliability and sealing performance of the energy storage device 3 may be improved.

[0186] As can be understood, the edge structure 323 according to the embodiment of the present application may be a ring-shaped structure that surrounds the edge of the cover 322, and the edge structure 323 is positioned between each partial area of ​​the edge of the cover 322 and the first wall 31 or the adapter member 33 to enhance the overall sealing.

[0187] In some embodiments, the fifth portion 3232 is located between the extension portion 3222 and the first wall 31. Specifically, the fifth portion 3232 and the first wall 31 may be stacked together. For example, the fifth portion 3232 may be stacked together with the adapter member 33. Alternatively, for example, the fifth portion 3232 may be stacked together with the first portion 331 of the adapter member 33. Alternatively, for example, the extension portion 3222 of the cover 322, the fifth portion 3232, the pressure release tab 321, and the first portion 331 of the adapter member 33 may be stacked together in this order and connected by the first connecting member 301. Alternatively, the adapter member 33 may be fixedly connected to the first wall 31, and therefore the fifth portion 3232 may be indirectly connected to the first wall 31.

[0188] In some embodiments, the pressure release tab 321 is provided with a first locating notch 3213, and the edge structure 323 is provided with a third locating notch 3233 that is located corresponding to the first locating notch 3213. On the one hand, the third locating notch 3233 of the edge structure 323 may position the attachment position of the edge structure 323 to improve attachment efficiency, and on the other hand, the third locating notch 3233 may correspond to another locating structure, for example, the other locating structure may be located corresponding to the first locating notch 3213 via the third locating notch 3233 to position the other structure to improve attachment efficiency of the pressure release assembly 32.

[0189] For example, the first positioning notch 3213, the third positioning notch 3233, and the second positioning notch 3223 installed on the cover 322 are installed corresponding to each other, thereby realizing the mutual positioning between the pressure release tab 321, the cover 322, and the edge structure 323, and further improving the installation efficiency of the pressure release assembly 32.

[0190] As can be appreciated, the pressure relief assembly 32 of the present embodiment may further include a seal structure 324. Figure 22 shows a schematic top view of the seal structure 324 of the present embodiment, and the seal structure 324 shown in Figure 22 may be any one of the at least two seal structures 324 included in the pressure relief assembly 32 shown in Figure 13.

[0191] In some embodiments, the pressure relief assembly 32 may include a sealing structure 324 located at least in an edge region 3212 of the pressure relief tab 321 to improve the sealing of the pressure relief assembly 32 .

[0192] As shown in FIG. 22, the pressure relief assembly 32 includes a two-layer seal structure 324, at least a portion of which is located on both sides of the edge region 3212 of the pressure relief tab 321, i.e., the pressure relief tab 321 is sandwiched between the two-layer seal structure 324 to improve the sealing performance on both sides of the pressure relief tab 321.

[0193] Specifically, each layer of the seal structure 324 may have a plurality of through holes, and the first connecting member 301 may sequentially pass through the through holes of the two-layer seal structure 324 to connect the two-layer seal structure 324 to the first wall 31. For example, the first connecting member 301 may sequentially pass through the through holes of the two-layer seal structure 324 to connect the two-layer seal structure 324 to the adapter member 33. For example, the extension portion 3222 of the cover 322, the fifth portion 3232, one layer of seal structure 324, the pressure release tab 321, the other layer of seal structure 324, and the first portion 331 of the adapter member 33 may be sequentially stacked, and the first connecting member 301 may sequentially pass through each layer of structure to achieve interconnection. Since the adapter member 33 is fixedly connected to the first wall 31, the two-layer seal structure 324 is connected to the adapter member 33, i.e., indirectly connected to the first wall 31.

[0194] As can be understood, the shape and size of the seal structure 324 according to the embodiment of the present application can be flexibly set according to actual use. For example, the shapes of the two-layer seal structure 324 can be the same or different, and the sizes of the two-layer seal structure 324 can be the same or different. For example, the two-layer seal structure 324 can be set to the same shape and size for ease of processing.

[0195] Also, for example, as shown in FIG. 22 , each of the two-layer seal structures 324 is annular so as to be surrounded by the edge region 3212 of the pressure release tab 321, thereby reducing the effect of the seal structure 324 on the central region of the pressure release tab 321 so that when the internal pressure or temperature of the energy storage device 3 reaches a predetermined threshold, the pressure release tab 321 can immediately open to release the internal pressure or temperature.

[0196] In some embodiments, the seal structure 324 can cover the weakened area 3211 so that the seal structure 324 can protect the weakened area 3211 such that other components have less of an effect on the weakened area 3211 .

[0197] In some embodiments, the seal structure 324 may further include a fourth locating notch 3241, which may be located corresponding to the first locating notch 3213 to determine the position of the seal structure 324. The first locating notch 3213, the third locating notch 3233, the second locating notch 3223, and the fourth locating notch 3241 are located correspondingly to each other, thereby achieving mutual positioning between the corresponding pressure release tabs 321, the cover 322, the edge structure 323, and the seal structure 324, and further improving the installation efficiency of the pressure release assembly 32.

[0198] In the embodiment of the present application, the pressure release tab 321 may further include other structures. For example, a filling structure 325 is disposed between the cover 322 and the pressure release tab 321. On the one hand, the filling structure 325 can improve the sealing and structural stability between the cover 322 and the pressure release tab 321. On the other hand, when some substances from the external environment enter the inside of the energy storage device 3 through the gap between the cover 322 and the first wall 31, the filling structure 325 may also have a certain absorption function. For example, when rainwater enters the inside of the energy storage device 3 through the gap between the cover 322 and the first wall 31, the filling structure 325 can absorb some of the rainwater to prevent the rainwater from affecting devices in the energy storage device 3.

[0199] It is understood that the material of the filling structure 325 can be flexibly set according to the actual use, for example, the material of the filling structure 325 includes at least one of rock wool, fire-retardant polyurethane foam, glass wool, and phenolic foam.

[0200] By using a flame-retardant material, it is possible to reduce heat diffusion and combustion as much as possible so as to prevent explosion of the energy storage device 3 when thermal runaway occurs in the battery 10 inside the energy storage device 3. When rock wool is used as a material, the rock wool is wrapped in a material such as aluminum foil, and the wrapped rock wool is placed between the cover 322 and the pressure release tab 321 to improve processing efficiency.

[0201] In some embodiments, the filling structure may be a thermal insulator to maintain the temperature inside the energy storage device 3.

[0202] Therefore, in an embodiment of the present application, a plurality of batteries 10 are stored inside the energy storage device 3, and a pressure release assembly 32 is installed on the first wall 31 of the energy storage device 3. If at least one battery 10 in the energy storage device 3 experiences thermal runaway, when the pressure or temperature inside the energy storage device 3 rises and reaches a predetermined threshold, the pressure release assembly 32 is activated to release the pressure or temperature inside the energy storage device 3, thereby improving the reliability of the energy storage device 3 while reducing the possibility of thermal diffusion between the plurality of batteries 10 in the energy storage device 3.

[0203] The pressure release assembly 32 according to the embodiment of the present application may have a multi-layer structure, covering the through-hole 311 of the first wall 31 and fixedly connected to the first wall 31 via the adapter member 33. Specifically, along the height direction Z of the energy storage device 3, the pressure release assembly 32 may sequentially include a cover 322, a filling structure 325, a sealing structure 324, a pressure release tab 321, and another layer of sealing structure 324, from the exterior to the interior of the energy storage device 3. Furthermore, at least a portion of a support structure 34 may be further installed inside the through-hole 311 of the first wall 31. In this way, during normal use of the energy storage device 3, the pressure release assembly 32 has a stable structure and reduces the possibility of failure. When the pressure or temperature inside the energy storage device 3 rises and reaches a predetermined threshold, the pressure release assembly 32 immediately opens to release the pressure or temperature inside the energy storage device 3, thereby minimizing the risk of explosion of the energy storage device 3.

[0204] Although the present application has been described with reference to preferred embodiments, various modifications may be made and some equivalents may be substituted without departing from the scope of the present application. In particular, the technical features described in each embodiment may be combined in any manner unless structurally inconsistent. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims. [Explanation of symbols]

[0205] 3 Energy storage devices 10 batteries 11 cases 12 Bus components 20 battery cells 21 Outer casing 22 Electrode Assembly 31 The First Wall 32 Pressure Relief Assembly 33 Adapter parts 34 Support structure 35 Reinforcing rib 36 Extended structure 37 Fire extinguishing pipe connection port 38 Ventilated structure 111 First case part 112 Second case part 200 battery modules 211 Casing 212 Cover Plate 213 Pressure release mechanism 214 Electrode terminal 214a Positive electrode terminal 214b Negative electrode terminal 221 Electrode main part 222 tabs 222a Positive electrode tab 222b Negative electrode tab 301 first connecting member 302 second connecting member 303 Third connecting member 311 Through hole 312 Protruding structure 321 Pressure Relief Tab 322 Cover 323 Edge Structure 324 Seal Structure 325 Filling structure 331 First Part 332 Second Part 333 Third Part 334 Containment Space 335 Notched Area 341 first support strip 342 Second Support Strip 391 Cabinet Door 392 Cabinet body 3011 Riveted structure 3012 bolt structure 3013 Gasket 3021 Welded joint 3022 Sealing material 3211 Vulnerable Area 3212 Edge Area 3213 First Locating Notch 3221 Side wall 3222 Extension 3223 Second Locating Notch 3231 Fourth Part 3232 Fifth Part 3233 Third Locating Notch 3241 4th Locating Notch

Claims

1. An energy storage device for storing a plurality of batteries (10), comprising: a first wall (31); a pressure release assembly (32) mounted on the first wall (31); An energy storage device characterized by:

2. A through hole (311) is provided in the first wall (31), and the pressure release assembly (32) covers the through hole (311).

2. The energy storage device of claim 1.

3. An adapter member (33) for connecting the first wall (31) and the pressure release assembly (32) is provided around the through hole (311) of the first wall (31).

3. The energy storage device of claim 2.

4. The adapter member (33) protrudes from a surface of the first wall (31) facing away from the interior of the energy storage device.

4. The energy storage device of claim 3.

5. The adapter member (33) forms an accommodation space (334), the adapter member (33) and the pressure release assembly (32) are connected by a first connecting member (301), and the accommodation space (334) is for accommodating at least a portion of the first connecting member (301).

5. The energy storage device according to claim 3 or 4.

6. The adapter member (33) includes a groove in which the receiving space (334) is formed, and an opening of the groove faces in a direction away from the center of the through hole (311).

6. The energy storage device according to claim 5.

7. The adapter member (33) and the first wall (31) are of one-piece construction. The energy storage device according to any one of claims 3 to 6.

8. The adapter member (33) and the first wall (31) are installed separately, and the adapter member (33) and the first wall (31) are connected by a second connecting member (302). The energy storage device according to any one of claims 3 to 6.

9. The adapter member (33) includes a first part (331), a second part (332), and a third part (333), the second part (332) is used to connect the first part (331) and the third part (333) that are installed opposite each other, and the first part (331), the second part (332), and the third part (333) are used to form an enclosed storage space (334); The first portion (331) is connected to the pressure release assembly (32) by a first connecting member (301), and the accommodation space (334) is used to accommodate at least a portion of the first connecting member (301); The third portion (333) is connected to the first wall (31) by the second connecting member (302).

9. The energy storage device of claim 8.

10. the first connecting member (301) includes a rivet structure (3011) and / or a bolt structure (3012), and the first connecting member (301) penetrates the pressure release assembly (32) and the first portion (331); 10. The energy storage device of claim 9.

11. the second connecting member (302) includes a weld seam (3021) formed by welding the third portion (333) and the first wall (31); 11. The energy storage device according to claim 9 or 10.

12. The second connecting member (302) includes a sealing member (3022) installed at the weld seam (3021).

12. The energy storage device of claim 11.

13. A protruding structure (312) protruding inward away from the energy storage device is provided around the through hole (311) of the first wall (31).

13. The energy storage device of claim 12.

14. The weld seam (3021) is located on the protruding structure (312).

14. The energy storage device of claim 13.

15. The energy storage device further includes a support structure (34) corresponding to the pressure relief assembly (32) and located on a side of the pressure relief assembly (32) facing the interior of the energy storage device.

15. The energy storage device according to any one of claims 2 to 14.

16. The support structure (34) is connected to the inner wall of the through hole (311), and at least a portion of the support structure (34) is located inside the through hole (311).

16. The energy storage device of claim 15.

17. The support structure (34) includes at least two support strips that cross each other; 17. Energy storage device according to claim 15 or 16.

18. The pressure relief assembly (32) includes a pressure relief tab (321) on which a weakened area (3211) is located.

18. An energy storage device according to any one of claims 1 to 17.

19. an edge region (3212) of the pressure release tab (321) is connected to the first wall (31), and the weakened region (3211) is located on at least a portion of the edge region (3212) of the pressure release tab (321) on a side closer to the center of the pressure release tab (321); 20. The energy storage device of claim 18.

20. A part of the edge region (3212) of the pressure release tab (321) is free of the weakened region (3211).

20. The energy storage device of claim 19.

21. the weakened area (3211) includes a notch that is positioned such that the opening of the pressure release tab (321) faces away from the interior of the energy storage device; 21. The energy storage device according to any one of claims 18 to 20.

22. The pressure release assembly (32) includes a cover (322) located on a side of the pressure release tab (321) away from the interior of the energy storage device and covering the pressure release tab (321).

22. The energy storage device according to any one of claims 18 to 21.

23. The cover (322) has a groove structure with an opening facing the pressure release tab (321), and an extension portion (3222) is provided in a portion of the side wall (3221) of the cover (322), extending from an end of the side wall (3221) close to the opening in a direction away from the side wall (3221), and the extension portion (3222) is used to connect the side wall (3221) and the first wall (31).

23. The energy storage device of claim 22.

24. The extension (3222) corresponds to the side of the pressure release tab (321) on which the weakened area (3211) is not located.

24. The energy storage device of claim 23.

25. The extension portion (3222) and the first wall (31) are connected by a first connecting member (301).

25. Energy storage device according to claim 23 or 24.

26. The pressure release assembly (32) includes an edge structure (323) installed around the edge of the cover (322), the edge structure (323) including a fourth portion (3231) and a fifth portion (3232) connected to each other and bent relative to each other, the fourth portion (3231) being located inside the groove structure, and the fifth portion (3232) being located between the extension portion (3222) and the first wall (31) and connected to the first wall (31).

26. The energy storage device according to any one of claims 23 to 25.

27. a first locating notch (3213) is provided on the pressure release tab (321), and a second locating notch (3223) is provided on the extension (3222) corresponding to the first locating notch (3213); 27. The energy storage device of claim 26.

28. The edge structure (323) is provided with a third locating notch (3233) that is provided corresponding to the first locating notch (3213); 28. The energy storage device of claim 27.

29. the first locating notch (3213) does not pass through the centerline of the edge of the pressure release tab (321) on which the first locating notch (3213) is located; 29. An energy storage device according to claim 27 or 28.

30. The first positioning notch (3213) is provided in an edge region (3212) of the pressure release tab (321) where the weakened region (3211) is not provided.

30. The energy storage device according to any one of claims 27 to 29.

31. The cover (322) has a groove structure with an opening facing the pressure release tab (321), and a partial area of ​​the side wall (3221) of the cover (322) and the first wall (31) are rotatably connected by a third connecting member (303).

23. The energy storage device of claim 22.

32. The pressure release assembly (32) includes a two-layer seal structure (324), at least a portion of which is located on each side of an edge region (3212) of the pressure release tab (321).

32. The energy storage device according to any one of claims 22 to 31.

33. Each of the two-layer seal structures (324) is annular.

33. The energy storage device of claim 32.

34. A filling structure (325) is disposed between the cover (322) and the pressure release tab (321).

34. An energy storage device according to any one of claims 23 to 33.

35. the material of the filling structure (325) comprises at least one of rock wool, fire-retardant polyurethane foam, glass wool, and phenolic foam; 35. The energy storage device of claim 34.

36. The first wall (31) is the top wall of the energy storage device.

36. An energy storage device according to any one of claims 1 to 35.

37. a surface of the top wall that faces away from the inside of the energy storage device is inclined in a direction of gravity from a central region toward an edge region; 37. The energy storage device of claim 36.

38. A reinforcing rib (35) is provided on the top wall.

38. An energy storage device according to claim 36 or 37.

39. The battery (10) includes a plurality of battery cells (20).

39. An energy storage device according to any one of claims 1 to 38.

Images