Battery device, electric equipment and energy storage equipment

Abstract

The utility model relates to the technical field of batteries, provides a battery device, electric equipment and energy storage equipment, and can solve the problem that a box body is easy to corrode. The battery device comprises single batteries and a box body, the box body comprises box walls, the box walls define a containing space, and the containing space is used for containing the single batteries; the box wall comprises a first wall, the first wall comprises a first structural layer and a second structural layer, the first structural layer and the second structural layer have a potential difference, the potential of the second structural layer is lower than that of the first structural layer, at least one surface of the first structural layer is a protection surface, and each protection surface faces or deviates from the containing space. The second structural layer is provided on the protection surface, and the second structural layer is configured as a sacrificial layer capable of reacting with a corrosive substance.

Description

TECHNICAL FIELD

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

[0002] The battery device includes a box body capable of providing protection for the internal battery monomer. The anticorrosion capability of the box body in the related art is limited and the structure is complex. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a battery device, a power consumption device and an energy storage device, which can reduce pitting and local corrosion, and effectively improve the anticorrosion performance and service life of the box body.

[0004] The first aspect of the present application provides a battery device, including a battery monomer and a box body, the box body including a box wall, the box wall enclosing a containing space, the containing space being used to contain the battery monomer; the box wall including a first wall, the first wall including a first structure layer and a second structure layer, the first structure layer and the second structure layer having a potential difference, and the potential of the second structure layer being lower than the potential of the first structure layer, at least one surface of the first structure layer being a protected surface, wherein each protected surface faces or faces away from the containing space, the second structure layer being arranged on the protected surface, and the second structure layer being configured as a sacrificial layer capable of reacting with corrosive substances.

[0005] The battery device provided by the present application includes a battery monomer and a box body, the box wall of the box body enclosing a containing space, the containing space being used to contain the battery monomer, thereby providing protection for the battery monomer in the containing space. On this basis, the box wall includes a first wall, the first wall including a first structure layer and a second structure layer, the first structure layer and the second structure layer having a potential difference, the potential of the second structure layer being lower than the potential of the first structure layer, and the second structure layer being arranged on the protected surface of the first structure layer, the protected surface facing or facing away from the containing space. Since the potential of the second structure layer is lower, during the contact with corrosive substances, the corrosion process is changed from the through corrosion in the thickness direction of the first wall to the lateral corrosion along the second structure layer first, and only after the whole layer of the second structure layer is corroded will the corrosion process be changed to the first structure layer. The second structure layer acts as a sacrificial layer in the corrosion process, has good corrosion resistance and the corrosion process is relatively uniform, reduces pitting and local corrosion, reduces the risk of failure of the box wall caused by serious local corrosion and cracking, and improves the service life of the box body. Compared with the scheme of setting a corrosion-resistant coating in the related art, the box body of the present application adopts a multi-layer structure having a potential difference, the second structure layer acts as a sacrificial layer and is uniformly corroded before the first structure layer, which can effectively improve the anticorrosion performance of the box body and the service life of the battery device.

[0006] In some embodiments of the present application, the projection of the second structure layer covers the projection of the first structure layer in the thickness direction of the first wall.

[0007] Here, the second structural layer can cover the first structural layer to provide more comprehensive protection for the second structural layer, and the second structural layer has a larger coverage area and a longer corrosion process, thereby further improving the corrosion resistance of the box body.

[0008] In some embodiments of the present application, along the thickness direction of the first wall, the first structural layer has a first thickness dimension, and the second structural layer has a second thickness dimension, and the first thickness dimension is greater than the second thickness dimension.

[0009] Here, the first thickness dimension of the first structural layer is greater than the second thickness dimension of the second structural layer, so that the first structural layer has higher structural strength as a base layer, thereby improving the impact resistance of the box body.

[0010] In some embodiments of the present application, along the thickness direction of the first wall, the second structural layer has a second thickness dimension, and the first wall has a third thickness dimension, and the ratio of the second thickness dimension to the third thickness dimension is greater than or equal to 0.03 and less than or equal to 0.2.

[0011] Here, the ratio of the second thickness dimension to the third thickness dimension is set within a reasonable range, so as to improve the corrosion resistance of the box body while maintaining good support performance of the first wall.

[0012] In some embodiments of the present application, the first structural layer includes a first element, and the second structural layer includes a second element, and the potential of the second element is less than the potential of the first element; when the content ratio of the second element in the second structural layer is 0.5%-3.5%, the second thickness dimension is positively correlated with the content ratio of the second element.

[0013] Here, the potential of the second element is less than the potential of the first element, so that the second structural layer including the second element can be corroded before the first structural layer; the content of the second element in the second structural layer is set within a suitable range to maintain the structural stability and corrosion resistance of the second structural layer; the content ratio of the second element is positively correlated with the second thickness dimension, and the content of the second element can be reduced and the second thickness dimension can be reduced to thin and lightweight the box body.

[0014] In some embodiments of the present application, the first structural layer and the second structural layer are arranged in a stacked structure, and the stacking direction of the stacked structure is the thickness direction of the first wall.

[0015] Here, the first structural layer and the second structural layer are arranged in a stacked structure along the thickness direction of the first wall, so that the second structural layer is located on the inner side or the outer side of the first wall, thereby facilitating the provision of full-surface protection and improving the protection effect.

[0016] In some embodiments of the present application, the second structure layer comprises at least two substructure layers arranged in a stack, and adjacent two substructure layers have a potential difference, and the potential of the at least two substructure layers increases layer by layer in the direction from the second structure layer to the first structure layer.

[0017] Here, by arranging the second structure layer as a plurality of substructure layers, the potential difference between adjacent substructure layers is formed, so that the plurality of substructure layers can be etched layer by layer to greatly improve the service life of the corrosion resistance of the box body.

[0018] In some embodiments of the present application, along the thickness direction of the first wall, the substructure layer has a sublayer thickness size, and along the direction from the second structure layer to the first structure layer, the sublayer thickness size of the at least two substructure layers decreases layer by layer.

[0019] Here, because the potentials of different substructure layers are different, by arranging the sublayer thickness sizes of different substructure layers to be different, and as the potential of the plurality of substructure layers increases, the sublayer thickness size decreases accordingly, so that different substructure layers have similar corrosion resistance, and the effect of each substructure layer as a sacrificial layer is more balanced.

[0020] In some embodiments of the present application, along the thickness direction of the first wall, the first wall has a third thickness size, the first structure layer comprises a first element, and the second structure layer comprises a second element, and in the case that the potential of the second element is less than the potential of the first element, the sublayer thickness size is positively correlated with the content ratio of the second element in the substructure layer.

[0021] Here, the potential of the second element is less than the potential of the first element, so that the substructure layer with a higher content of the second element can be etched first to realize the layer-by-layer sacrifice of the second structure layer; the content ratio of the second element is positively correlated with the sublayer thickness size, and the second thickness size can be reduced by increasing the content of the second element, so that different substructure layers have similar corrosion resistance, and the effect of each substructure layer as a sacrificial layer is more balanced.

[0022] In some embodiments of the present application, the content ratio of the second element in the substructure layer and the sublayer thickness size satisfy the following relationship: in the case that the content ratio of the second element in the substructure layer is 2.0%-2.5%, the ratio of the sublayer thickness size to the third thickness size is 5%-7%; or, in the case that the content ratio of the second element in the substructure layer is 1.3%-1.8%, the ratio of the sublayer thickness size to the third thickness size is 4%-6%; or, in the case that the content ratio of the second element in the substructure layer is 0.5%-0.8%, the ratio of the sublayer thickness size to the third thickness size is 3%-5%.

[0023] Here, the content ratio of the second element in the substructure layer and the thickness dimension of the sublayer are set in a reasonable correlation range, so that different substructure layers have similar corrosion resistance, and the performance balance of each substructure layer in the second structure layer is improved.

[0024] In some embodiments of the present application, the box wall includes a bottom guard plate for carrying the battery monomer; in the bottom guard plate, the second structure layer is located on the side of the first structure layer facing the accommodation space.

[0025] Here, by setting the second structure layer of the bottom guard plate on the side facing the accommodation space, the second structure layer contacts the corrosive substances of the electrolyte in the accommodation space before the first structure layer, thereby improving the corrosion resistance and service life of the bottom guard plate.

[0026] In some embodiments of the present application, the bottom guard plate further includes a protective layer, the protective layer is arranged on the side of the first structure layer away from the accommodation space, and the impact resistance of the protective layer is greater than that of the first structure layer.

[0027] Here, the bottom guard plate is further provided with a protective layer, the first structure layer is sandwiched between the protective layer and the second structure layer, and the protective layer has good impact resistance to resist external impact and improve the impact resistance of the bottom guard plate.

[0028] In some embodiments of the present application, the accommodation space includes an opening communicating with the outside, and the box wall includes a cover plate arranged at the opening position; in the cover plate, the second structure layer is located on the side of the first structure layer away from the accommodation space.

[0029] Here, by setting the second structure layer of the cover plate on the side facing the external environment, the second structure layer contacts the corrosive substances such as external air before the first structure layer, thereby improving the corrosion resistance and service life of the cover plate.

[0030] The second aspect of the present application provides a power consumption device comprising the battery device of the first aspect for providing electric energy.

[0031] The power consumption device provided by the present application comprises a box body, the box body adopts a multi-layer structure with a potential difference, the second structure layer acts as a sacrificial layer and is uniformly corroded before the first structure layer, which can effectively improve the corrosion resistance and service life of the box body.

[0032] The third aspect of the present application provides an energy storage device comprising the battery device of the first aspect for providing electric energy.

[0033] The energy storage device provided by the present application comprises a box body, the box body adopts a multi-layer structure with a potential difference, the second structure layer acts as a sacrificial layer and is uniformly corroded before the first structure layer, which can effectively improve the corrosion resistance and service life of the box body. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings are only for the purpose of illustrating some embodiments of the application, and for those skilled in the field, other drawings can be obtained based on these drawings without creative labor.

[0036] Figure 1 A structural schematic diagram of an electrical device in an embodiment of the application;

[0037] Figure 2 A structural schematic diagram of a battery device in an embodiment of the application;

[0038] Figure 3 A structural schematic diagram of a battery cell in a battery device in an embodiment of the application;

[0039] Figure 4 A structural schematic diagram of a first wall in a battery device in an embodiment of the application;

[0040] Figure 5 A structural schematic diagram of a sub-structure layer in a battery device in an embodiment of the application;

[0041] Figure 6 A structural schematic diagram of a plurality of sub-structure layers in a battery device in an embodiment of the application;

[0042] Figure 7 A structural schematic diagram of a battery device in an embodiment of the application;

[0043] Figure 8 A structural schematic diagram of a bottom protective plate in a battery device in an embodiment of the application;

[0044] Figure 9 A structural schematic diagram of a battery device in an embodiment of the application; Figure 8 A structural schematic diagram of a cross section of A-A in the battery device;

[0045] Figure 10 A structural schematic diagram of a battery device in an embodiment of the application; Figure 9 A structural schematic diagram of a local enlarged structure at B in the battery device;

[0046] Figure 11 A structural schematic diagram of a cover plate in a box structure in an embodiment of the application.

[0047] BRIEF DESCRIPTION OF DRAWINGS

[0048] 100 - accommodation space; 200 - box wall; 210 - first structural layer; 220 - second structural layer; 221 - sub-structural layer; 221a - first sub-layer; 221b - second sub-layer; 221c - third sub-layer; 200a - bottom guard plate; 230 - protective layer; 200b - cover plate; 300 - side plate; 400 - battery monomer; 410 - shell; 420 - electrode assembly; 500 - power device; T1 - first thickness dimension; T2 - second thickness dimension; T3 - third thickness dimension. DETAILED DESCRIPTION

[0049] In order to enable every intended person to understand the above-mentioned purposes, features and advantages of the present application more clearly, the schemes of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0050] In the following description, a lot of specific details are set forth in order to give a thorough understanding of the present application, but the present application can also be implemented in other different manners from those described herein; obviously, the embodiments described in the specification are only a part of the embodiments of the present application, and not all the embodiments.

[0051] Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as those commonly understood by the person skilled in the art to which the present application belongs; the terms used herein are only for the purpose of describing the specific embodiments, and are not intended to limit the present application; the terms “comprise” and “have” and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover the inclusions without exclusivity.

[0052] In the description of the embodiments of the present application, the technical terms “first”, “second”, “third” and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of “plurality” is two or more, unless otherwise explicitly and specifically limited.

[0053] Reference herein to “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrence of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are "or" relationship.

[0055] In the description of the embodiments of the present application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed in a particular orientation, operate or be used, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0056] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0057] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0058] Next, the present application will be described in detail.

[0059] The battery device can be provided in an electric device using a battery as an energy source, or in an energy storage device, including an energy storage container, an energy storage cabinet, etc. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, a vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0060] In the following embodiments, for the convenience of description, the electric device of the embodiments of the present application is taken as a vehicle for example.

[0061] Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. As shown in the figure, the vehicle is internally provided with a battery device and a power device 500, and the battery device supplies power for the power device 500 to drive the vehicle to travel. Figure 1

[0062] In some technical solutions, the battery device includes a bottom guard plate 200a, which can be used for bottom protection of the battery device. Generally, the battery device adopts a stamping box body basin bottom or an aluminum bottom plate welding or a cooling plate to bear the bottom load function, and a metal bottom guard plate 200a is externally added to improve the protection ability of the bottom of the battery box. An inner cavity is formed between the bottom plate and the bottom load bearing part (box body basin bottom / bottom plate / cooling plate), and if the inner cavity is not sealed well, the bottom load bearing part and the bottom guard plate 200a will produce an electrochemical reaction under long-term use conditions, forming corrosion or rust, which adversely affects the long-term reliability of the battery device.

[0063] Based on the corrosion protection requirements of the bottom guard plate 200a, the current external PVC material is generally used, and the internal electrophoresis or spraying is used. The production process of the bottom guard plate 200a is complex, the production cost is high, and the production rhythm is long. The upper cover of the battery box is mainly used for the top sealing and protection of the battery device, and a scheme of using a metal upper cover and adding a corrosion-resistant coating is generally used to solve the corrosion problem, or a non-metal upper cover is directly used. The metal coating scheme is complex in process, high in cost, and long in production rhythm, and the non-metal upper cover is relatively low in strength.

[0064] The embodiments of the present application disclose a battery device, which comprises a battery monomer 400 and a box body, the box body comprises a box wall 200, the box wall 200 comprises a first wall, the first wall comprises a first structure layer 210 and a second structure layer 220, the potential of the second structure layer 220 is lower than the potential of the first structure layer 210, and in the process of contacting with a corrosive substance, corrosion first occurs along the second structure layer 220 in a transverse direction, and the second structure layer 220 is uniformly corroded before the corrosion turns to the first structure layer 210. The second structure layer 220 acts as a sacrificial layer and is uniformly corroded before the first structure layer 210, reducing pitting and local corrosion, and can effectively improve the corrosion resistance and service life of the box body.

[0065] Figure 2 ​An exploded view of a battery apparatus is provided for some embodiments of the present application. The battery apparatus referred to in embodiments of the present application can also include one or more battery cell 400 assemblies (not shown in the figure, please refer to the combination of battery cells 400) for providing voltage and capacity. The battery cell 400 assembly can include a plurality of battery cells 400 connected in series, in parallel, or in a mixed connection through busbar components.

[0066] In some embodiments, the battery cell 400 assembly is generally formed by arranging a plurality of battery cells 400.

[0067] As an example, the battery cell 400 assembly can be a battery module formed by arranging and fixing a plurality of battery cells 400 into an independent module.

[0068] As an example, the battery module can be formed by bundling a plurality of battery cells 400 with a cable tie.

[0069] In some embodiments, the battery apparatus can be a battery pack, which can include a box and one or more battery cell 400 assemblies housed in the cavity.

[0070] As an example, the battery cell 400 assembly can be a battery module, which can be housed in the cavity by fixing the battery module in the cavity.

[0071] As an example, the battery cell 400 assembly can also be housed in the cavity by directly fixing a plurality of battery cells 400 in the cavity.

[0072] As an example, as shown in Figure 2 The box can include a first box part and a second box part. The first box part and the second box part are fastened so that the inside of the box forms a closed space, i.e., a cavity, to accommodate the battery cell 400 assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box part can be a top cover or a bottom plate.

[0073] In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0074] In the embodiments of the present application, the battery cell 400 can be a secondary battery, which refers to a battery cell 400 that can be activated by charging after discharging.

[0075] The battery cell 400 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0076] In addition, the battery cell 400 can be a cylindrical battery cell 400, a prismatic battery cell 400, a soft-pack battery cell 400, or a battery cell 400 of other shapes, and the prismatic battery cell 400 includes a square battery cell 400, a blade battery cell 400, a multi-prismatic battery cell 400, such as a hexagonal battery cell 400, etc., and the embodiments of the present application are not particularly limited.

[0077] Reference is made to Figure 3 In some embodiments, the battery cell 400 includes a housing 410 and an electrode assembly 420. The housing 410 includes an end cap and a case, and the case is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly 420 and electrolyte and other substances. The case can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0078] In some embodiments, at least one electrode terminal is provided on the housing 410, and the electrode terminal is electrically connected with the tab. The electrode terminal can be directly connected with the tab, or indirectly connected with the tab through an adapter component. The electrode terminal can be provided on the end cap, or provided on the case.

[0079] In some embodiments, a pressure relief mechanism is provided on the housing 410. The pressure relief mechanism is used to release the internal pressure of the battery cell 400.

[0080] The battery cell 400 generally includes an electrode assembly 420. The electrode assembly 420 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 400, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0081] In some embodiments, the electrode assembly 420 further includes a separator, which is arranged between the positive electrode and the negative electrode.

[0082] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of separator film, and any known porous structure separator film with good chemical stability and mechanical stability can be selected.

[0083] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0084] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0085] In some embodiments, the battery cell 400 further includes an electrolyte that functions to conduct ions between the positive electrode and the negative electrode. The type of electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0086] In some embodiments, the electrode assembly 420 is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0087] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0088] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked. One positive electrode sheet can be interposed between adjacent folded segments.

[0089] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded segments that are stacked.

[0090] As an example, a plurality of separators can be provided, and each of the plurality of separators can be interposed between any adjacent positive electrode sheet or negative electrode sheet.

[0091] As an example, the separators can be continuously provided, and can be interposed between any adjacent positive electrode sheet or negative electrode sheet by being folded or wound.

[0092] In some embodiments, the electrode assembly 420 can have a cylindrical shape, a flat shape, or a polygonal shape.

[0093] In some embodiments, the electrode assembly 420 can include tabs. The tabs can function to guide current from the electrode assembly 420. The tabs can include positive tabs and negative tabs.

[0094] Referring to Figure 2 and Figure 4The battery device provided by the embodiments of the present application comprises a battery cell 400 and a box body, the box body comprises a box wall 200, the box wall 200 encloses a containing space 100 for containing the battery cell 400, the box wall 200 comprises a first wall, the first wall comprises a first structure layer 210 and a second structure layer 220, the first structure layer 210 and the second structure layer 220 have a potential difference, the potential of the second structure layer 220 is lower than the potential of the first structure layer 210, at least one surface of the first structure layer 210 is a protected surface, wherein each protected surface faces or is away from the containing space 100, the second structure layer 220 is arranged on the protected surface, and the second structure layer 220 is configured as a sacrificial layer capable of reacting with a corrosive substance.

[0095] In some examples, the box wall 200 comprises a bottom wall, a side wall, a bottom guard plate 200a and a cover plate 200b, the bottom wall and the side wall enclose the containing space 100 with an opening, and the cover plate 200b can be arranged on the opening to close the containing space 100. The cross-sectional profile of the box body can be a regular or irregular shape such as a rectangle, a circle, an ellipse, a triangle or a hexagon, and the side wall can be one or more.

[0096] It should be noted that the first wall can be any wall of the box wall 200, for example, one or more of the bottom wall, the side wall, the bottom guard plate 200a and the cover plate 200b can be the first wall, and the plurality of first walls can adopt the same or different structural forms. For example, the bottom guard plate 200a and the cover plate 200b are respectively arranged as the first wall, the bottom guard plate 200a and the cover plate 200b respectively comprise the second structure layer 220, or the bottom guard plate 200a, the cover plate 200b and the side wall are respectively arranged as the first wall, the bottom guard plate 200a, the cover plate 200b and the side wall respectively comprise the second structure layer 220, or all the box walls 200 of the box body are provided with the second structure layer 220.

[0097] In the embodiments of the present application, the potential refers to the electrode potential, which refers to the measurement value of the tendency of a material to gain or lose electrons in a predetermined environment (such as a solution) compared with a standard reference electrode (such as a standard hydrogen electrode), the potential can reflect the order of chemical reactions of the material, and the material with a lower potential can react first than the material with a higher potential.

[0098] In some examples, on the side of the protected surface of the first structure layer 210, the second structure layer 220 isolates the first structure layer 210 from the outside, where the outside is relative to the first structure layer 210, rather than the entire battery device, and the outside relative to the first structure layer 210 can refer to the external environment of the battery device or the internal environment of the battery device.

[0099] In some examples, the side of the first structural layer 210 facing the corrosive substance is the side to be protected, and the corrosive substance can come from the inside of the accommodation space 100 or from the external environment of the box. For example, the corrosive substance is water vapor, electrolyte, etc. in the accommodation space 100; for another example, the corrosive substance is air in the environment where the box is located, etc.

[0100] In some examples, the side of the first structural layer 210 facing the accommodation space 100 is the side to be protected, and the second structural layer 220 is arranged on the inner side of the first wall; in other examples, the side of the first structural layer 210 facing away from the accommodation space 100 is the side to be protected, and the second structural layer 220 is arranged on the outer side of the first wall; in yet other examples, both the side of the first structural layer 210 facing the accommodation space 100 and the side facing away from the accommodation space 100 are the sides to be protected, and the second structural layer 220 is arranged on the inner and outer sides of the first wall, respectively.

[0101] In some examples, the second structural layer 220 is arranged on the side of the first wall facing the corrosive substance instead of the anticorrosive coating, so that the anticorrosive coating is replaced by the second structural layer 220, and the processing technology is simple, facilitating production and reducing costs; in other examples, the second structural layer 220 is arranged on the side of the first wall facing the corrosive substance, and the anticorrosive coating is arranged on the side of the second structural layer 220 facing the anticorrosive structure, so that the combination of the anticorrosive coating and the second structural layer 220 further improves the corrosion resistance of the box wall 200.

[0102] In some examples, the first structural layer 210 and the second structural layer 220 comprise conductive materials, which include metal materials, carbon-containing materials, and conductive polymers, etc. The metal materials are, for example, stainless steel and aluminum alloy, the carbon-containing materials are, for example, graphite, and the conductive polymers are, for example, polyaniline and polypyrrole, etc.

[0103] In some examples, the structural layer made of metal material is formed by one or more of stamping, extrusion, and die casting, etc.

[0104] The battery device provided in the present application has a box with an accommodation space 100 for accommodating battery monomers 400, and the box wall 200 of the box encloses the accommodation space 100, thereby providing protection for the battery monomers 400 in the accommodation space 100.

[0105] On this basis, the box wall 200 includes a first wall including a first structural layer 210 and a second structural layer 220, the first structural layer 210 and the second structural layer 220 have a potential difference, the potential of the second structural layer 220 is lower than the potential of the first structural layer 210, and the second structural layer 220 is arranged on a protected surface of the first structural layer 210, the protected surface faces or is away from the containing space. Since the potential of the second structural layer 220 is lower, during contact with the corrosive substance, the corrosion process is diverted from through corrosion in the thickness direction of the box wall to lateral corrosion along the second structural layer 220 first, and then to the first structural layer 210 after the second structural layer 220 is corroded in its entirety. The second structural layer 220 acts as a sacrificial layer in the corrosion process, has good corrosion resistance, and the corrosion process is relatively uniform, reducing pitting and local corrosion, reducing the risk of box wall 200 failure due to severe local corrosion cracking, and improving the service life of the box.

[0106] Compared with the scheme in the related art that the anticorrosive coating is arranged at a high cost, the box in the present application adopts a multilayer structure with a potential difference, the second structural layer 220 acts as a sacrificial layer and is corroded in its entirety uniformly before the first structural layer 210, which can effectively improve the anticorrosive performance of the box and the service life of the battery device.

[0107] Referring to Figure 4 , Figure 5 and Figure 6 In some embodiments of the present application, the projection of the second structural layer 220 covers the projection of the first structural layer 210 in the thickness direction of the first wall.

[0108] In some examples, the thickness direction of the first wall is associated with the position of the first wall; for example, the box is arranged in the shape of a approximate cuboid, and in the case where the bottom wall or cover plate 200b is arranged as the first wall, the corresponding thickness direction is the height direction of the box; in the case where the side wall extending in the length direction is arranged as the first wall, the corresponding thickness direction is the width direction of the box; in the case where the side wall extending in the width direction is arranged as the first wall, the corresponding thickness direction is the length direction of the box.

[0109] In some examples, the second structural layer 220 is continuously covered on the first structural layer 210, and the surface of the second structural layer 220 contacting the first structural layer 210 can be a plane, a curved surface, or a special-shaped surface provided with a concave-convex structure.

[0110] The technical scheme of the embodiments of the present application, the second structural layer 220 can cover the first structural layer 210, so as to provide more comprehensive protection for the second structural layer 220, and the second structural layer 220 has a larger coverage area and a longer corrosion process, further improving the anticorrosive performance of the box.

[0111] Referring to Figure 4In some embodiments of the present application, the first structural layer 210 has a first thickness dimension T1 and the second structural layer 220 has a second thickness dimension T2 along the thickness direction of the first wall, and the first thickness dimension T1 is greater than the second thickness dimension T2.

[0112] In some examples, the thickness dimensions of the first structural layer 210 and the second structural layer 220 are uniformly arranged, and the first thickness dimension T1 is greater than the second thickness dimension T2.

[0113] In other examples, the thickness dimensions of the first structural layer 210 and the second structural layer 220 are non-uniformly arranged, and the minimum value of the first thickness dimension T1 is greater than the maximum value of the second thickness dimension T2.

[0114] The technical scheme of the embodiments of the present application is that the first thickness dimension T1 of the first structural layer 210 is greater than the second thickness dimension T2 of the second structural layer 220, so that the first structural layer 210 has higher structural strength as a base layer, improving the impact resistance of the box.

[0115] Referring to Figure 4 In some embodiments of the present application, the second structural layer 220 has a second thickness dimension T2 and the first wall has a third thickness dimension T3 along the thickness direction of the first wall, and the ratio of the second thickness dimension T2 to the third thickness dimension T3 is greater than or equal to 0.03 and less than or equal to 0.2.

[0116] It should be noted that the larger the ratio of the second thickness dimension T2 to the third thickness dimension T3, the larger the proportion of the second structural layer 220 in the first wall, and the second structural layer 220 is difficult to be corroded, which can effectively slow down the corrosion speed; the smaller the ratio of the second thickness dimension T2 to the third thickness dimension T3, the larger the proportion of the first structural layer 210 in the first wall, and the first structural layer 210 can provide effective support to improve the structural strength of the box wall 200.

[0117] In some examples, the ratio of the second thickness dimension T2 to the third thickness dimension T3 is greater than or equal to 0.03 and less than or equal to 0.11, for example, the ratio of the second thickness dimension T2 to the third thickness dimension T3 is 0.03, 0.05, 0.07, 0.09 or 0.11.

[0118] In other examples, the ratio of the second thickness dimension T2 to the third thickness dimension T3 is greater than or equal to 0.11 and less than or equal to 0.2, for example, the ratio of the second thickness dimension T2 to the third thickness dimension T3 is 0.11, 0.13, 0.15, 0.17 or 0.2.

[0119] The technical scheme of the embodiment of the present application sets the ratio of the second thickness size T2 and the third thickness size T3 within a reasonable range, so as to improve the corrosion resistance of the tank wall 200 while maintaining good support performance of the tank wall 200.

[0120] In some embodiments of the present application, the first structure layer 210 includes a first element, and the second structure layer 220 includes a second element, and the electric potential of the second element is less than that of the first element; and when the content ratio of the second element in the second structure layer 220 is 0.5%-3.5%, the second thickness size T2 is positively correlated with the content ratio of the second element.

[0121] In some examples, the first element is an aluminum element, and the second element is a zinc element, for example, the first structure layer 210 includes a 5-series aluminum alloy (containing a magnesium alloy) or a 6-series aluminum alloy (containing a silicon alloy), and the second structure layer 220 includes a zinc alloy; in other examples, the first element is an iron element, and the second element is a zinc element, for example, the first structure layer 210 includes a steel material, and the second structure layer 220 includes pure zinc, zinc-iron alloy, or zinc-aluminum-magnesium alloy, etc.

[0122] It should be noted that the higher the content ratio of the second element in the second structure layer 220, the more easily the second structure layer 220 is corroded, so as to protect the first structure layer 210 by sacrifice; and the lower the content ratio of the second element in the second structure layer 220, the better the corrosion resistance of the second structure layer 220.

[0123] In some examples, the content ratio of the second element in the second structure layer 220 is greater than or equal to 0.5% and less than or equal to 1.3%, for example, the content ratio of the second element in the second structure layer 220 is 0.5%, 0.7%, 1.0%, 1.2%, or 1.3%.

[0124] In other examples, the content ratio of the second element in the second structure layer 220 is greater than or equal to 1.3% and less than or equal to 2%, for example, the content ratio of the second element in the second structure layer 220 is 1.3%, 1.5%, 1.7%, or 2.0%.

[0125] In yet other examples, the content ratio of the second element in the second structure layer 220 is greater than or equal to 2% and less than or equal to 3.5%, for example, the content ratio of the second element in the second structure layer 220 is 2%, 2.5%, 3%, or 3.5%.

[0126] It should be noted that the larger the second thickness size T2 in the third thickness size T3 of the first wall, the more difficult the second structure layer 220 is corroded, and the corrosion speed can be effectively slowed down; and the smaller the second thickness size T2 in the third thickness size T3 of the first wall, the more easily the second structure layer 220 is corroded, so as to protect the first structure layer 210 by sacrifice.

[0127] For example, the content ratio of the second element in the second structural layer 220 is 0.5%, and the ratio of the second thickness dimension T2 to the third thickness dimension T3 is 0.03; the content ratio of the second element in the second structural layer 220 is 2%, and the ratio of the second thickness dimension T2 to the third thickness dimension T3 is 0.11; the content ratio of the second element in the second structural layer 220 is 3.5%, and the ratio of the second thickness dimension T2 to the third thickness dimension T3 is 0.2. Of course, the content ratio of the second element in the second structural layer 220 and the ratio of the second thickness dimension T2 can also adopt other corresponding relationships, which are not limited in the application.

[0128] In some examples, the content of the second element in the second structural layer 220 can be measured by a spectral analysis method such as X-ray spectrum or a chemical analysis method such as titration, etc., and the embodiments of the application are not limited thereto.

[0129] The technical scheme of the embodiments of the application is that the potential of the second element is less than the potential of the first element, so that the second structural layer 220 including the second element can be corroded before the first structural layer 210; the content of the second element in the second structural layer 220 is set in a suitable range, so as to maintain the structural stability and corrosion resistance of the second structural layer 220; the content ratio of the second element is positively correlated with the second thickness dimension T2, and the content of the second element can be reduced and the second thickness dimension T2 can be reduced, so as to realize the thinness and lightness of the box body.

[0130] Referring to Figure 4 and Figure 5 In some embodiments of the application, the first structural layer 210 and the second structural layer 220 are arranged in a stacked structure, and the stacking direction of the stacked structure is the thickness direction of the first wall.

[0131] The technical scheme of the embodiments of the application is that the first structural layer 210 and the second structural layer 220 are arranged in a stacked structure along the thickness direction of the first wall, so that the second structural layer 220 is located on the inner side or the outer side of the first wall, thereby facilitating the provision of full-surface protection and improving the protection effect.

[0132] Referring to Figure 5 , Figure 6 and Figure 7 In some embodiments of the application, the second structural layer 220 includes at least two sub-structural layers 221 arranged in a stacked structure, and adjacent two sub-structural layers 221 have a potential difference, and the potential of the at least two sub-structural layers 221 increases layer by layer in the direction of the second structural layer 220 towards the first structural layer 210.

[0133] In some examples, the thickness direction of the plurality of (including two) sub-structural layers 221 in the second structural layer 220 is consistent with the thickness direction of the second structural layer 220 and the corresponding first structural layer 210.

[0134] In some examples, in the two adjacent sub-structure layers 221, the potential of the sub-structure layer 221 far away from the first structure layer 210 is lower than the potential of the sub-structure layer 221 close to the first structure layer 210, and the sub-structure layer 221 far away from the first structure layer 210 is preferentially corroded.

[0135] In some examples, the potential difference of the two adjacent sub-structure layers 221 in the plurality of sub-structure layers 221 is kept consistent; in other examples, the potential difference of the two adjacent sub-structure layers 221 in the plurality of sub-structure layers 221 is set to increase or decrease.

[0136] The technical scheme of the embodiment of the present application is that the second structure layer 220 is set as a plurality of sub-structure layers 221, and there is a potential difference between the adjacent sub-structure layers 221, so that the plurality of sub-structure layers 221 can be corroded layer by layer, so as to greatly improve the service life of the corrosion resistance of the box.

[0137] Reference Figure 6 In some embodiments of the present application, along the thickness direction of the first wall, the sub-structure layer 221 has a sub-layer thickness size, and along the direction of the second structure layer 220 towards the first structure layer 210, the sub-layer thickness size of at least two sub-structure layers 221 decreases layer by layer.

[0138] It should be noted that the plurality of sub-structure layers 221 in the second structure layer 220 can have the same or different sub-layer thickness sizes, and since the potentials of different sub-structure layers 221 are different, the sub-structure layers 221 with the same sub-layer thickness size have different sacrifice efficiencies, and the sub-structure layers 221 with different sub-layer thickness sizes can be set to have the same or similar sacrifice efficiency.

[0139] In some examples, the difference of the sub-layer thickness size of the two adjacent sub-structure layers 221 in the plurality of sub-structure layers 221 is kept consistent; in other examples, the difference of the sub-layer thickness size of the two adjacent sub-structure layers 221 in the plurality of sub-structure layers 221 is set to increase or decrease.

[0140] The technical scheme of the embodiment of the present application is that since the potentials of different sub-structure layers 221 are different, by setting the sub-layer thickness sizes of different sub-structure layers 221 to be different, and as the potentials of the plurality of sub-structure layers 221 increase, the sub-layer thickness size decreases, so that different sub-structure layers 221 have similar corrosion resistance, and the effect of each sub-structure layer 221 as a sacrificial layer is more balanced.

[0141] In some embodiments of the present application, the first wall has a third thickness dimension T3 in the thickness direction of the first wall, the first structural layer 210 includes a first element, the second structural layer 220 includes a second element, and the sub-layer thickness dimension is positively correlated with the content ratio of the second element in the sub-structural layer 221 when the potential of the second element is less than the potential of the first element.

[0142] In some examples, the first element is an aluminum element, and the second element is a zinc element, for example, the first structural layer 210 includes a 5-series aluminum alloy or a 6-series aluminum alloy, and the second structural layer 220 includes a zinc alloy; in other examples, the first element is an iron element, and the second element is a zinc element, for example, the first structural layer 210 includes a steel material, and the second structural layer 220 includes pure zinc, zinc-iron alloy, or zinc-aluminum-magnesium alloy, etc.

[0143] In some examples, among the two adjacent sub-structural layers 221, the sub-structural layer 221 far from the first structural layer 210 has a higher content of the second element than the sub-structural layer 221 close to the first structural layer 210, and the sub-structural layer 221 far from the first structural layer 210 has a larger sub-layer thickness dimension than the sub-structural layer 221 close to the first structural layer 210, so that the plurality of sub-structural layers 221 have the same sacrifice efficiency.

[0144] The technical scheme of the embodiments of the present application is that the potential of the second element is less than the potential of the first element, so that the sub-structural layer 221 with a higher content of the second element can be corroded first to realize the layer-by-layer sacrifice of the second structural layer 220; the content ratio of the second element is positively correlated with the sub-layer thickness dimension, and the second thickness dimension T2 can be reduced by increasing the content of the second element, so that the different sub-structural layers 221 have similar corrosion resistance, and the effect of each sub-structural layer 221 as a sacrificial layer is more balanced.

[0145] In some embodiments of the present application, the content ratio of the second element in the sub-structural layer 221 and the sub-layer thickness dimension satisfy the following relationship: when the content ratio of the second element in the sub-structural layer 221 is 2.0%-2.5%, the ratio of the sub-layer thickness dimension to the third thickness dimension T3 is 5%-7%; or, when the content ratio of the second element in the sub-structural layer 221 is 1.3%-1.8%, the ratio of the sub-layer thickness dimension to the third thickness dimension T3 is 4%-6%; or, when the content ratio of the second element in the sub-structural layer 221 is 0.5%-0.8%, the ratio of the sub-layer thickness dimension to the third thickness dimension T3 is 3%-5%.

[0146] It should be noted that the content ratio of the second element in the substructure layer 221 is high, and the substructure layer 221 is more easily corroded, so that the substructure layer 221 is corroded before the substructure layer 221 at a high potential or the first structure layer 210; the content ratio of the second element in the substructure layer 221 is low, and the corrosion resistance of the substructure layer 221 is better.

[0147] In addition, the sublayer thickness size accounts for a large proportion in the third thickness size T3 of the first wall, and the substructure layer 221 is difficult to be corroded, which can effectively slow down the corrosion speed; the sublayer thickness size accounts for a small proportion in the third thickness size T3 of the first wall, and the substructure layer 221 is easily corroded, so that the substructure layer 221 is corroded before the substructure layer 221 at a high potential or the first structure layer 210.

[0148] In the embodiment of the application, the second structure layer 220 can be a single-layer structure, or the second structure layer 220 includes two, three or more substructure layers 221. For example, the second structure layer 220 includes a first sublayer 221a, a second sublayer 221b and a third sublayer 221c, wherein the first sublayer 221a is close to the first structure layer 210, the third sublayer 221c is away from the third structure layer, and the second sublayer 221b is arranged between the first sublayer 221a and the third sublayer 221c. In the corrosion process, the third sublayer 221c, the second sublayer 221b and the first sublayer 221a are corroded and sacrificed in turn.

[0149] In some examples, the content ratio of the second element in the third sublayer 221c is 2.0%-2.5%, for example, the content ratio of the second element in the third sublayer 221c is 2.0%, 2.1%, 2.2%, 2.3%, 2.4% or 2.5%; the content ratio of the second element in the second sublayer 221b is 1.3%-1.8%, for example, the content ratio of the second element in the second sublayer 221b is 1.3%, 1.4%, 1.5%, 1.6%, 1.7% or 1.8%; the content ratio of the second element in the first sublayer 221a is 0.5%-0.8%, for example, the content ratio of the second element in the first sublayer 221a is 0.50%, 0.55%, 0.60%, 0.65%, 0.70%, 0.75% or 0.80%.

[0150] In some examples, the ratio of the sublayer thickness dimension of the third sublayer 221c to the third thickness dimension T3 is 5%-7%, for example, the ratio of the sublayer thickness dimension of the third sublayer 221c to the third thickness dimension T3 is 5.0%, 5.5%, 6.0%, 6.5%, or 7.0%; the ratio of the sublayer thickness dimension of the second sublayer 221b to the third thickness dimension T3 is 4%-6%, for example, the ratio of the sublayer thickness dimension of the second sublayer 221b to the third thickness dimension T3 is 4.0%, 4.5%, 5.0%, 5.5%, or 6.0%; the ratio of the sublayer thickness dimension of the first sublayer 221a to the third thickness dimension T3 is 3%-5%, for example, the ratio of the sublayer thickness dimension of the first sublayer 221a to the third thickness dimension T3 is 3.0%, 3.5%, 4.0%, 4.5%, or 5.0%.

[0151] In some examples, the content ratio of the second element in the third sublayer 221c is 2.0%-2.5%, the ratio of the sublayer thickness dimension of the third sublayer 221c to the third thickness dimension T3 is 6%; the content ratio of the second element in the second sublayer 221b is 1.3%-1.8%, the ratio of the sublayer thickness dimension of the second sublayer 221b to the third thickness dimension T3 is 5%; the content ratio of the second element in the first sublayer 221a is 0.5%-0.8%, the ratio of the sublayer thickness dimension of the first sublayer 221a to the third thickness dimension T3 is 4%. Of course, the content ratio of the second element in the sublayer structure and the ratio of the sublayer thickness dimension can also adopt other corresponding relationships, which are not limited in the present application.

[0152] The technical scheme of the embodiment of the present application sets the content ratio of the second element in the substructure layer 221 and the sublayer thickness dimension in a reasonable correlation range, so that different substructure layers 221 have similar corrosion resistance, and the performance balance of each substructure layer 221 in the second structure layer 220 is improved.

[0153] Referring to Figure 7 , Figure 8 , Figure 9 and Figure 10 In some embodiments of the present application, the box wall 200 includes a bottom guard plate 200a for carrying the battery monomer 400; in the bottom guard plate 200a, the second structure layer 220 is located on the side of the first structure layer 210 facing the containing space 100.

[0154] In some examples, the bottom guard plate 200a directly carries the battery monomer 400; in other examples, a liquid cooling plate, a box bottom plate or other structure is arranged between the bottom guard plate 200a and the battery monomer 400, and the bottom guard plate 200a indirectly carries the battery monomer 400.

[0155] In some examples, the battery cell 400 is placed on the bottom guard plate 200a, and in the vertical direction, the battery cell 400, the second structural layer 220 of the bottom guard plate 200a, and the first structural layer 210 are sequentially arranged from top to bottom.

[0156] In some examples, the second structural layer 220 in the bottom guard plate 200a includes a plurality of sub-structural layers 221, and in the direction of the battery cell 400 close to the first structural layer 210, the potentials of the plurality of sub-structural layers 221 sequentially increase.

[0157] The technical scheme of the embodiment of the present application sets the second structural layer 220 of the bottom guard plate 200a on the side facing the containing space 100, so that the second structural layer 220 contacts the corrosive substances of the electrolyte in the containing space 100 first, thereby improving the corrosion resistance and service life of the bottom guard plate 200a.

[0158] Referring to Figure 10 and Figure 11 In some embodiments of the present application, the bottom guard plate 200a further includes a protective layer 230, the protective layer 230 is arranged on the side of the first structural layer 210 away from the containing space 100, and the impact resistance of the protective layer 230 is greater than that of the first structural layer 210.

[0159] In some examples, the first structural layer 210 can be made of a metal material such as steel, aluminum alloy, or iron alloy, and the protective layer 230 can be made of one or more of PVC, carbon fiber, polycarbonate, and aramid fiber.

[0160] In some examples, the impact resistance can be measured by a bottom ball impact test or a vehicle collision test, and the embodiments of the present application do not limit this.

[0161] The technical scheme of the embodiment of the present application, the bottom guard plate 200a further includes a protective layer 230, the first structural layer 210 is sandwiched between the protective layer 230 and the second structural layer 220, and the protective layer 230 has good impact resistance to resist external impact and improve the impact resistance of the bottom guard plate 200a.

[0162] Referring to Figure 2 and Figure 11 In some embodiments of the present application, the containing space 100 includes an opening communicating with the outside, the box wall 200 includes a cover plate 200b arranged at the opening position, and in the cover plate 200b, the second structural layer 220 is located on the side of the first structural layer 210 away from the containing space 100.

[0163] In some examples, the opening of the accommodating space 100 is located at the upper side of the box body, and the second structural layer 220, the first structural layer 210 and the battery monomer 400 of the cover plate 200b are sequentially arranged from top to bottom in the vertical direction.

[0164] In some examples, the second structural layer 220 in the cover plate 200b includes a plurality of sub-structural layers 221, and the potentials of the plurality of sub-structural layers 221 sequentially decrease in the direction away from the bottom guard plate 200a of the battery monomer 400.

[0165] The technical scheme of the embodiment of the present application sets the second structural layer 220 of the cover plate 200b on the side facing the external environment, so that the second structural layer 220 contacts the external air and other corrosive substances before the first structural layer 210, thereby improving the corrosion resistance and service life of the cover plate 200b.

[0166] Reference Figure 2 In some embodiments of the present application, at least one battery monomer 400 is stacked in the accommodating space 100.

[0167] In some examples, the battery device further includes a liquid cooling plate, the liquid cooling plate is arranged between the bottom guard plate 200a and the battery monomer 400, the liquid cooling plate is used for cooling or heating the battery monomer 400, and the liquid cooling plate includes a base plate and a flow channel plate, the flow channel plate is installed at the bottom of the base plate, and the base plate carries the battery monomer 400.

[0168] In some examples, the battery device further includes an inner guard plate, the flow channel plate is located on the side of the inner guard plate close to the battery monomer 400, so that the inner guard plate is located between the flow channel plate and the bottom guard plate 200a. Wherein, the bottom guard plate 200a can be made of light weight materials such as aluminum alloy.

[0169] The technical scheme of the embodiment of the present application, the battery device includes a box body, the box body adopts a multi-layer structure with a potential difference, the second structural layer 220 acts as a sacrificial layer and is uniformly corroded before the first structural layer 210, which can effectively improve the corrosion resistance and service life of the box body.

[0170] Reference Figure 1 The embodiment of the present application also provides a power consuming device including the battery device for providing electric energy of the embodiment of the present application.

[0171] In some examples, the power consuming device is a vehicle, and the battery device can be arranged at the bottom, head or tail of the vehicle. The battery device can be used for power supply of the vehicle, for example, the battery device can be used as the operating power supply of the vehicle. The vehicle can further include a controller and a motor, and the controller is used to control the battery device to supply power to the power device 500, for example, to meet the power demand of the vehicle during starting, navigation and driving.

[0172] In some examples, the battery device can not only serve as an operating power source of the vehicle, but also serve as a driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle. For example, the battery device supplies power to the power device 500 so as to drive the vehicle to travel.

[0173] The technical scheme of the embodiment of the application, the power equipment includes a box body, the box body adopts a multi-layer structure with a potential difference, the second structure layer 220 acts as a sacrificial layer and is uniformly corroded before the first structure layer 210, which can effectively improve the corrosion resistance and service life of the box body.

[0174] The embodiment of the application also provides a power storage device, which includes the battery device for providing electric energy.

[0175] In some examples, the power storage device includes a power module and an electric cabinet module. The electric cabinet module includes at least one electric cabinet, the electric cabinet is a device for realizing electric energy storage, and generally includes a cabinet body, at least one electric box is generally arranged in the cabinet body, and at least one battery device is generally arranged in each electric box, and the battery device can realize storage of electric energy. The power module is a component for realizing power output, including but not limited to a thyristor and the like.

[0176] The technical scheme of the embodiment of the application, the power storage device includes a box body, the box body adopts a multi-layer structure with a potential difference, the second structure layer 220 acts as a sacrificial layer and is uniformly corroded before the first structure layer 210, which can effectively improve the corrosion resistance and service life of the box body.

[0177] In a specific battery device and power equipment of the application, the box body includes a bottom guard plate 200a, a cover plate 200b and four side plates 300, the bottom guard plate 200a and the four side plates 300 enclose to form a containing space 100 with an opening, and the cover plate 200b can be arranged on the opening of the containing space 100, so as to isolate the containing space 100 from the external environment. The outer layer (for example, the lower layer) of the bottom guard plate 200a is a protective layer 230 made of PVC, which is used to resist bottom impact such as gravel impact; the middle layer (the first structure layer 210) of the bottom guard plate 200a is the main structure thereof, and the first structure layer 210 is made of 5-series aluminum alloy or 6-series aluminum alloy; and the inner layer (for example, the upper layer) of the bottom guard plate 200a is a sacrificial layer formed by the second structure layer 220, which is used to protect corrosive substances such as electrolyte, and the sacrificial layer is a zinc-containing aluminum alloy. The outer layer (for example, the upper layer) of the cover plate 200b is the second structure layer 220 made of zinc-containing aluminum alloy, which is used to protect corrosive substances such as air, and the inner layer (for example, the lower layer) of the cover plate 200b is the first structure layer 210, and the first structure layer 210 of the cover body is made of 5-series aluminum alloy or 6-series aluminum alloy.

[0178] In another specific battery device and electric equipment of the present application, the box includes a bottom guard plate 200a, a cover plate 200b and four side plates 300, the bottom guard plate 200a and the four side plates 300 enclose to form a containing space 100 with an opening, and the cover plate 200b can be arranged on the opening of the containing space 100 to isolate the containing space 100 from the external environment. The outer layer (e.g. lower layer) of the bottom guard plate 200a is a protective layer 230 made of PVC material, which is used to resist bottom impact such as gravel impact; the middle layer (first structural layer 210) of the bottom guard plate 200a is its main structure, and the first structural layer 210 is made of steel material such as high-strength steel and stainless steel; and the inner layer (e.g. upper layer) of the bottom guard plate 200a is a sacrificial layer formed by the second structural layer 220, which is used to protect corrosive substances such as electrolyte, and the sacrificial layer is made of pure zinc, zinc-iron alloy or zinc-aluminum-magnesium alloy. The outer layer (e.g. upper layer) of the cover plate 200b is the second structural layer 220 made of pure zinc or zinc-containing alloy, which is used to protect corrosive substances such as air, and the inner layer (e.g. lower layer) of the cover plate 200b is the first structural layer 210, and the first structural layer 210 of the cover body is made of steel material such as high-strength steel or stainless steel, wherein the second structural layer 220 can be combined with the first structural layer 210 by electroplating.

[0179] The box, battery device, electric equipment and energy storage equipment of the embodiments of the present application, the first wall of the box is arranged in a stack of the first structural layer 210 and the second structural layer 220, the second structural layer 220 is formed as a sacrificial layer by using low-potential material, and the content of the second element (e.g. zinc element) in the second structural layer 220 is adjusted to form a potential gradient between the second structural layer 220 and the first structural layer 210, and the corrosion occurs along the crystal boundary longitudinally (in the thickness direction) in the related scheme, and is diverted to the path of first corroding the second structural layer 220 transversely and then corroding the first structural layer 210 in the present application, so that the corrosion resistance of the box is improved.

[0180] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery device, characterized by, The battery cell comprises: a battery cell; a box body comprising a box wall, the box wall enclosing a containing space for containing the battery cell; the box wall comprises a first wall, the first wall comprises a first structural layer and a second structural layer, the first structural layer and the second structural layer have a potential difference, and the potential of the second structural layer is lower than that of the first structural layer, at least one surface of the first structural layer is a protected surface, each of the protected surfaces faces or faces away from the containing space, the second structural layer is arranged on the protected surface, and the second structural layer is configured as a sacrificial layer capable of reacting with corrosive substances.

2. The battery device according to claim 1, characterized by The projection of the second structural layer covers the projection of the first structural layer in the thickness direction of the first wall.

3. The battery device of claim 1, wherein In the thickness direction of the first wall, the first structural layer has a first thickness dimension, and the second structural layer has a second thickness dimension, and the first thickness dimension is greater than the second thickness dimension.

4. The battery device of claim 1, wherein In the thickness direction of the first wall, the second structural layer has a second thickness dimension, and the first wall has a third thickness dimension, and the ratio of the second thickness dimension to the third thickness dimension is greater than or equal to 0.03 and less than or equal to 0.

2.

5. The battery device according to claim 3 or 4, characterized by The first structural layer comprises a first element, and the second structural layer comprises a second element, and the potential of the second element is less than that of the first element; When the content ratio of the second element in the second structural layer is 0.5%-3.5%, the second thickness dimension is positively correlated with the content ratio of the second element.

6. The battery device according to any one of claims 1 to 4, characterized by, The first structural layer and the second structural layer are arranged in a laminated structure, and the lamination direction of the laminated structure is the thickness direction of the first wall.

7. The battery device according to any one of claims 1 to 4, characterized by, The second structural layer comprises at least two sub-structural layers arranged in a stack, and adjacent two of the sub-structural layers have a potential difference, and the potential of the at least two sub-structural layers increases layer by layer in the direction of the second structural layer towards the first structural layer.

8. The battery device of claim 7, wherein, In the thickness direction of the first wall, the sub-structural layer has a sub-layer thickness dimension, and the sub-layer thickness dimension of the at least two sub-structural layers decreases layer by layer in the direction of the second structural layer towards the first structural layer.

9. The battery device of claim 8, wherein, In the thickness direction of the first wall, the first wall has a third thickness dimension, the first structural layer comprises a first element, and the second structural layer comprises a second element, and when the potential of the second element is less than that of the first element, the sub-layer thickness dimension is positively correlated with the content ratio of the second element in the sub-structural layer.

10. The battery device of claim 9, wherein, The content ratio of the second element in the sub-structural layer and the sub-layer thickness dimension satisfy the following relationship: When the content ratio of the second element in the sub-structural layer is 2.0%-2.5%, the ratio of the sub-layer thickness dimension to the third thickness dimension is 5%-7%; or When the content ratio of the second element in the sub-structural layer is 1.3%-1.8%, the ratio of the sub-layer thickness dimension to the third thickness dimension is 4%-6%; or In the case that the content ratio of the second element in the substructure layer is 0.5%-0.8%, the ratio of the thickness size of the sublayer to the third thickness size is 3%-5%.

11. The battery device according to any one of claims 1 to 4, characterized by, The box wall comprises a bottom guard plate for bearing the battery monomer; In the bottom guard plate, the second structure layer is located on the side of the first structure layer facing the containing space.

12. The battery device of claim 11, wherein, The bottom guard plate further comprises a protective layer arranged on the side of the first structure layer away from the containing space, and the impact resistance of the protective layer is greater than that of the first structure layer.

13. The battery device according to any one of claims 1 to 4, characterized by, The containing space comprises an opening communicating with the outside world, and the box wall comprises a cover plate arranged at the opening position. In the cover plate, the second structure layer is located on the side of the first structure layer away from the containing space.

14. An electrical device, characterized by The battery device of any one of claims 1-13 for providing electric energy.

15. An energy storage device, comprising: The battery device of any one of claims 1-13 for providing electric energy.

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