Battery case, battery device, and energy storage device

Abstract

Embodiments of the present application provide a battery case, a battery device, and an energy storage device. The battery case is applied to the energy storage device. The battery case comprises a bottom protection plate and a liquid cooling plate; the battery case is internally provided with an accommodating space; the liquid cooling plate is used for regulating the temperature in the accommodating space; the bottom protection plate is used for protecting the battery case; and the bottom protection plate is located on the side of the liquid cooling plate away from the accommodating space, and the edge of the bottom protection plate is welded to the liquid cooling plate. The edge of the bottom protection plate is welded to the liquid cooling plate, thereby improving the height space utilization rate of the battery case, and also improving the sealing performance of the battery case.

Description

Battery housing, battery unit and energy storage device Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery housing, a battery device, and an energy storage device. Background Technology

[0002] With the continuous advancement of battery technology, various new energy industries using batteries as energy storage devices have experienced rapid development. To achieve an IP67 protection rating for battery packs, multiple rivet nuts, gaskets, bolts, and other components are typically used for sealing during the sealing process. However, this results in low space utilization of the battery pack's height and poor sealing performance. Summary of the Invention

[0003] This application provides a battery box, a battery device, and an energy storage device, which aims to improve the height space utilization of the battery box while improving the sealing performance of the battery box by welding the edge of the bottom protective plate to the liquid cooling plate.

[0004] In a first aspect, a battery housing is provided for use in an energy storage device. The battery housing includes a bottom protective plate and a liquid cooling plate. The battery housing has an internal storage space. The liquid cooling plate is used to regulate the temperature within the storage space. The bottom protective plate is used to protect the battery housing. The bottom protective plate is located on the side of the liquid cooling plate away from the storage space, and the edge of the bottom protective plate is welded to the liquid cooling plate.

[0005] In the technical solution of this application embodiment, in the application of energy storage devices, the energy storage devices are usually placed in power plants or power transmission and distribution systems, etc. The bottom protective plate has little wear and does not need to be replaced. However, the bottom protective plate of the power device is prone to wear during the use of the battery device and needs to be replaced frequently. Moreover, the replacement process requires bolts. In the energy storage device of this application, the edge of the bottom protective plate is welded to the liquid cooling plate. The process is simple, and the welding process reduces the number of fasteners and the sealing interface. It eliminates the need for sealing gaskets or adhesive between the bottom protective plate and the liquid cooling plate, improving the height space utilization of the battery box. At the same time, welding instead of adhesive can improve the sealing performance of the battery box.

[0006] In some embodiments, the projection of the bottom protective plate in the thickness direction of the liquid cooling plate lies within the projection of the liquid cooling plate in the thickness direction of the liquid cooling plate.

[0007] In the technical solution of this application embodiment, the projection of the bottom protective plate in the thickness direction of the liquid cooling plate is located within the projection of the liquid cooling plate, which allows the edge of the bottom protective plate to be welded to the liquid cooling plate, so that it can be sealed and can also play a protective role.

[0008] In some embodiments, the battery housing further includes a support member and a top cover. The support member is disposed on the side of the liquid cooling plate away from the receiving space. The top cover includes a first cover plate disposed opposite to the liquid cooling plate and a second cover plate disposed around the periphery of the first cover plate, such that the first cover plate, the second cover plate, and the liquid cooling plate form the receiving space. The second cover plate includes an extension disposed opposite to the liquid cooling plate and extending toward the outside of the receiving space. The inner wall of the support member near the liquid cooling plate, the liquid cooling plate, and the extension are connected by fasteners.

[0009] In the technical solution of this application embodiment, the liquid cooling plate is fastened to the support member by fasteners. Simultaneously, the fasteners provide locking points for the top cover, reducing the number of fasteners and the number of sealing interfaces, improving the utilization rate of the battery box's height space, enhancing the overall reliability of the battery box, and reducing production steps and increasing production efficiency. Furthermore, since the support member does not participate in the sealing process, helium testing is unnecessary, resulting in lower overall sealing costs.

[0010] In some embodiments, the support member and the bottom cover are both attached to the surface of the liquid cooling plate away from the receiving space, and the support member and the bottom cover are placed side by side.

[0011] In the technical solution of this application embodiment, the bottom protective plate is welded to the liquid cooling plate, located inside the fastener, and does not overlap with the support member, thereby improving the height space utilization of the battery box.

[0012] In some embodiments, the support member and the bottom protective plate are both attached to the surface of the liquid cooling plate away from the receiving space, and the support member and the bottom protective plate are stacked on top of each other.

[0013] In the technical solution of this application embodiment, the bottom protective plate is welded to the liquid cooling plate. The bottom protective plate, the inner wall of the support member near the liquid cooling plate, the liquid cooling plate and the extension are connected by fasteners. Since the liquid cooling plate and the bottom protective plate are directly welded, the height space utilization rate of the battery box can be improved.

[0014] In some embodiments, a sealing gasket or adhesive is provided between the liquid cooling plate and the extension portion.

[0015] In the technical solution of this application embodiment, during the sealing process, a sealing gasket or adhesive is provided between the liquid cooling plate and the extension portion to improve the sealing performance of the battery box.

[0016] In some embodiments, the accommodating space is used to accommodate a plurality of battery cells, wherein pressure relief mechanisms for the plurality of battery cells are disposed on the housings of the plurality of battery cells facing the liquid cooling plate.

[0017] In some embodiments, the liquid cooling plate includes a flow channel and a mounting groove, the mounting groove having a hollow structure and being arranged sequentially near the flow channel, wherein the projection of the pressure relief mechanism in the thickness direction of the liquid cooling plate is located within the projection of the mounting groove.

[0018] In the technical solution of this application embodiment, the pressure relief mechanism is set on the outer shell of multiple battery cells facing the liquid cooling plate. More specifically, the projection of the pressure relief mechanism in the thickness direction of the liquid cooling plate is located within the projection of the mounting groove. That is, the pressure relief mechanism is set in the mounting groove, and the gas discharged when the pressure relief mechanism adjusts the temperature inside the box is discharged through the mounting groove.

[0019] In some embodiments, the battery housing further includes a gas collection device disposed on the battery housing for collecting gas discharged from the pressure relief mechanism by multiple battery cells.

[0020] In the technical solution of this application embodiment, a gas collection device is provided on the box. When the pressure relief mechanism is adjusting the temperature inside the box, the gas discharged can be collected by the gas collection device, so that the temperature inside the box reaches the normal value.

[0021] In some embodiments, the side of the bottom guard plate includes a through hole for discharging test liquid inside the battery box and a rivet nut disposed on the through hole for sealing the through hole.

[0022] In the technical solution of this application embodiment, the component after welding the liquid cooling plate and the bottom protective plate needs to undergo insulation electrophoresis. Since the surrounding enclosed space is prone to liquid accumulation, through holes are provided on the side of the bottom protective plate to drain the accumulated liquid, i.e., the test liquid. After the electrophoresis is completed, blind hole rivet nuts are riveted to the through holes to achieve sealing.

[0023] In a second aspect, a battery device is provided, comprising: a plurality of battery cells; and a battery housing as described in any of the first aspects, wherein the battery housing is used to house the plurality of battery cells.

[0024] Thirdly, an energy storage device is provided, including a battery device as described in the second aspect, the battery device being used to store or provide electrical energy. Attached Figure Description

[0025] Figure 1 shows a partial structural schematic diagram of a battery device according to an embodiment of this application.

[0026] Figure 2 shows a schematic diagram of the structure of some components of a battery box according to an embodiment of this application.

[0027] Figure 3 shows a cross-sectional view of a portion of a battery housing according to an embodiment of this application along the Z direction.

[0028] Figure 4 shows a cross-sectional view of a portion of a battery housing according to an embodiment of this application along the Y direction.

[0029] Figure 5 shows an exploded view of some components of a battery housing according to an embodiment of this application along the Y direction.

[0030] Figure 6 shows a cross-sectional structural diagram of a battery housing along the X direction according to an embodiment of this application.

[0031] Figure 7 shows a cross-sectional view of another battery housing according to an embodiment of this application along the X direction.

[0032] Figure 8 shows a schematic diagram of the structure of some components of a battery box according to an embodiment of this application along the Y-axis.

[0033] Figure 9 shows a structural schematic diagram of some components of another battery box according to an embodiment of this application.

[0034] Figure 10 shows an exploded view of some components of another battery housing according to an embodiment of this application.

[0035] Figure 11 shows an exploded view of some components of another battery housing according to an embodiment of this application.

[0036] Figure 12 shows a schematic diagram of the structure of some components of a battery box according to an embodiment of this application along the Y-axis.

[0037] Figure 13 shows an exploded view of some components of another battery housing according to an embodiment of this application.

[0038] The accompanying drawings are not drawn to scale. Detailed Implementation

[0039] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0040] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0041] The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0044] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0045] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0046] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0047] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0048] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0049] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0050] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0051] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0052] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0053] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0054] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0055] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0056] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0057] This application provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0058] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0059] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0060] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0061] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0062] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0063] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0064] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as the Insulation Monitoring Module (IMM), the Master Battery Management Unit (MBMU), the Ethernet (ETH) module, and the fiber optic conversion module.

[0065] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0066] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0067] With the rapid development of electric vehicles and energy storage systems, battery packs, as core components of these technologies, have received widespread attention regarding their performance and safety. Sealing is a crucial technical indicator in the design and manufacturing of battery packs. Specifically, the sealing performance of the battery pack directly affects the reliability, stability, and lifespan of the entire battery system.

[0068] It should be understood that a battery pack can consist of a housing and multiple battery cells housed within the housing. The housing may include a cover, a bottom protective plate, and a cooling plate. The cover has an open structure. The cooling plate, in addition to regulating the temperature of the battery cells within the housing, and the bottom protective plate, in addition to protecting the housing exterior, participate in sealing with the frame. The frame is a component located at the edge of the housing, used for sealing and supporting the housing.

[0069] To achieve Ingress Protection 67 (IP67), current electrical device sealing designs typically involve fastening the bottom protective plate of the battery pack enclosure to the frame with fasteners, welding the cold-rolled steel plate to the frame edge, or overlapping the cold-rolled steel plate directly under the frame and securing it with rivet nuts and gaskets. The bottom protective plate is then bolted to the frame. In both of these sealing methods, sealing the bottom protective plate requires additional gaskets or adhesive, introducing more components such as rivet nuts, gaskets, and bolts, resulting in lower utilization of the enclosure's height space. Furthermore, the frame must also participate in the sealing process; unstable frame welding can easily lead to airtightness failure, resulting in poor enclosure sealing.

[0070] To address the issues of low height space utilization and poor sealing in the enclosure, it is advisable to exclude the frame from the sealing process, thereby improving the enclosure's airtightness and reducing the use of components such as rivets, gaskets, and bolts, thus increasing the height utilization of the enclosure.

[0071] Based on the above considerations, this application proposes a battery enclosure for use in energy storage devices. The battery enclosure includes a bottom protective plate and a liquid cooling plate. The liquid cooling plate is used to regulate the temperature within the housing space, and the bottom protective plate is used to protect the battery enclosure. The bottom protective plate is located on the side of the liquid cooling plate away from the housing space, and its edge is welded to the liquid cooling plate. Welding the edge of the bottom protective plate to the liquid cooling plate eliminates the need for a sealing gasket or adhesive between the bottom protective plate and the liquid cooling plate, improving the utilization rate of the battery enclosure's height space. Furthermore, welding, rather than applying adhesive, improves the sealing performance of the battery enclosure.

[0072] Figure 1 shows a partial structural schematic diagram of a battery device 10 according to an embodiment of this application. As shown in Figure 1, the battery device 10 of this application embodiment may include multiple battery cells 12 to meet different power usage requirements. The shape of the battery cells 12 in this application embodiment can be set according to actual applications. For example, the battery cell 12 can be cylindrical, or it can be cuboid or other shapes, and this application embodiment is not limited to these.

[0073] It should be understood that, as shown in FIG. 1, the battery device 10 of this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 12. The housing 11 of this embodiment has a hollow internal structure, and the multiple battery cells 12 are accommodated within the housing 11. The housing 11 may include two parts, referred to herein as a first housing portion 111 and a second housing portion 112, which are fastened together by a sealing member 13. The shapes of the first housing portion 111 and the second housing portion 112 may be determined according to the shape of the components accommodated internally, for example, according to the shape of the combination of the multiple battery cells 12 accommodated internally. At least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, the first housing portion 111 and the second housing portion 112 can both be hollow cuboids with one open side each. The openings of the first housing portion 111 and the second housing portion 112 are opposite to each other, and the first housing portion 111 and the second housing portion 112 are interlocked to form a housing 11 with a closed cavity, which can be used to accommodate multiple battery cells 12. The multiple battery cells 12 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the interlocking of the first housing portion 111 and the second housing portion 112.

[0074] For example, as shown in Figure 1, only one of the first housing portion 111 and the second housing portion 112 may be a hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the first housing portion 111 as a hollow cuboid with one opening and the second housing portion 112 as a plate-shaped example, the second housing portion 112 covers the opening of the first housing portion 111 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 12.

[0075] Figure 2 shows a schematic diagram of the structure of some components of a battery box 20 according to an embodiment of this application.

[0076] According to some embodiments of this application, referring to FIG2 and further referring to FIG3, FIG3 shows a cross-sectional structural schematic diagram of some components of a battery box 20 according to an embodiment of this application along the Z direction. This application provides a battery box 20 for use in an energy storage device. The battery box 20 includes a bottom protective plate 22 and a liquid cooling plate 21. The battery box 20 has an internal accommodating space. The liquid cooling plate 21 is used to close the opening below the accommodating space and to regulate the temperature inside the accommodating space. The bottom protective plate 22 is used to protect the battery box 20. The bottom protective plate 22 is located on the side of the liquid cooling plate 21 away from the accommodating space, and the edge of the bottom protective plate 22 is welded to the liquid cooling plate 21.

[0077] As shown in the figure, the Z direction is the thickness direction of the bottom protective plate 22, the Y direction is the length direction of the bottom protective plate 22, and the X direction is the width direction of the bottom protective plate 22.

[0078] The lower part of the internal storage space of the battery housing 20 (as shown in the figure, along the opposite direction of the Z direction) has an opening. In addition to regulating the temperature of the battery housing, the liquid cooling plate 21 can also be used to close the opening below the storage space.

[0079] The bottom protective plate 22 is used to protect the battery box 20. Specifically, the bottom of the battery box 20, i.e. the part with the opening in the receiving space, is sealed by a component consisting of the bottom protective plate 22 and the liquid cooling plate 21 welded together. Typically, as shown in the figure, the component consisting of the bottom protective plate and the liquid cooling plate 21 welded together is in the form of a basin to seal the battery box 20.

[0080] The bottom protective plate 22 is located on the side of the liquid cooling plate 21 away from the housing space. It can be understood that the bottom protective plate 22 is located below the liquid cooling plate 21, or it can be described as the bottom protective plate 22 and the liquid cooling plate 21 being placed in opposite directions along the Z direction as shown in the figure.

[0081] As shown in the figure, the edge of the bottom protective plate 22 is welded to the liquid cooling plate 21 to form a welding point 201. The welding method can be laser filler wire welding or other welding methods. This application does not limit the method in any way.

[0082] In energy storage applications, the energy storage device is usually placed in power plants or power transmission and distribution systems, where the bottom protective plate 22 experiences less wear and therefore does not require frequent replacement. However, in power-consuming devices, the bottom protective plate 22 is prone to wear during battery use and requires frequent replacement. Furthermore, bolts are typically used for easy replacement, so the bottom protective plate 22 and the liquid cooling plate 21 are usually fixed together with bolts. In the energy storage device of this application, the edge of the bottom protective plate 22 is welded to the liquid cooling plate 21. This simplifies the process and reduces the number of fasteners and the sealing interface during sealing. It also eliminates the need for a gasket or adhesive between the bottom protective plate 22 and the liquid cooling plate 21, improving the utilization of the height space of the battery housing 20. Additionally, welding the bottom protective plate 22 to the liquid cooling plate 21 instead of using adhesive improves the sealing performance of the battery housing 20.

[0083] According to some embodiments of this application, optionally, please continue to refer to FIG2 and FIG3, the projection of the bottom protective plate 22 in the thickness direction of the liquid cooling plate 21 is located within the projection of the liquid cooling plate 21.

[0084] The projection of the bottom protective plate 22 in the thickness direction of the liquid cooling plate 21 is located within the projection of the liquid cooling plate 21. That is, the dimension of the bottom protective plate 22 in the X direction of the figure is smaller than the dimension of the liquid cooling plate 21 in the X direction of the figure, and the dimension of the bottom protective plate 22 in the Y direction of the figure is smaller than the dimension of the liquid cooling plate 21 in the Y direction of the figure.

[0085] Through the above design, the components after the edge of the bottom protective plate 22 is welded to the liquid cooling plate 21 can not only play a sealing role, but also a protective role.

[0086] Figure 4 shows a cross-sectional view of a portion of a battery case 20 according to an embodiment of this application along the Y direction; Figure 5 shows an exploded view of a portion of a battery case 20 according to an embodiment of this application along the Y direction; and Figure 6 shows a cross-sectional view of a battery case 20 according to an embodiment of this application along the X direction.

[0087] Optionally, according to some embodiments of this application, referring to Figures 4 to 6, the battery housing 20 further includes a support member 23 and a top cover 24. The support member 23 is disposed on the side of the liquid cooling plate 21 away from the receiving space. The top cover 24 includes a first cover plate 241 disposed opposite to the liquid cooling plate 21 and a second cover plate 242 disposed around the periphery of the first cover plate 241, such that the first cover plate 241, the second cover plate 242 and the liquid cooling plate 21 form the receiving space. The second cover plate 242 includes an extension portion 2421 disposed opposite to the liquid cooling plate 21 and extending toward the outside away from the receiving space. The inner wall of the support member 23 near the liquid cooling plate 21, the liquid cooling plate 21 and the extension portion 2421 are connected by fasteners.

[0088] The support member 23 is similar to the bottom protective plate 22 in that it is located on the side away from the receiving space. The support member 23 is a frame. In the normal sealing process of the battery device, the frame plays the role of supporting the entire battery device while participating in the sealing. The frame is usually located between the liquid cooling plate 21 and the bottom protective plate 22. However, in this application, the frame, i.e. the support member 23 in this application, is located below the liquid cooling plate 21 and does not participate in the sealing, but only plays the role of support.

[0089] It should be understood that sealing refers to securing the upper and lower covers or other components of the battery housing 20 with fasteners and installing sealing gaskets, such as O-rings or rubber gaskets, around all fasteners to achieve a sealing effect.

[0090] The second cover plate 242 includes a portion 2421 that is disposed opposite to the liquid cooling plate 21. Alternatively, it can be described as the second cover plate 242 including a portion 2421 that is disposed parallel to the liquid cooling plate 21 and extends toward the outside of the housing space. The extension portion 2421 is used to participate in the sealing process of the entire battery housing 20.

[0091] During the sealing process, the inner wall of the support member 23 near the liquid cooling plate 21, the liquid cooling plate 21, and the extension 2421 are connected by fasteners, which can be bolts and nuts, screws, press-fit parts, studs, etc.

[0092] In this application, the liquid cooling plate 21 is fastened to the support member 23 by fasteners. Simultaneously, the fasteners provide locking points for the extension 2421 of the upper cover 24. This process reduces the number of fasteners and the number of sealing interfaces, improving the utilization rate of the height space of the battery box 20. Furthermore, since the support member 23 does not participate in the sealing process and the bottom protective plate 22 does not contact the support member 23, the overall reliability of the battery box 20 is improved, and production processes are reduced, increasing production efficiency. Additionally, because the support member 23 does not participate in the sealing process, helium testing is not required, resulting in lower overall sealing costs.

[0093] According to some embodiments of this application, optionally, the support member 23 and the bottom protective plate 22 are both attached to the surface of the liquid cooling plate 21 away from the receiving space, and the support member 23 and the bottom protective plate 22 are placed side by side.

[0094] As shown in Figure 6, both the support member 23 and the bottom protective plate 22 are attached to the surface of the liquid cooling plate 21 away from the receiving space, or they can be described as being attached to the lower surface of the liquid cooling plate 21. The bottom protective plate 22 serves as a protective and sealing element, while the support member 23 serves as a support element.

[0095] The support member 23 and the bottom guard plate 22 are placed side by side, that is, the bottom guard plate 22 does not contact the support member 23 along the length direction of the bottom guard plate 22 (Y direction in the figure), or it can be described as the welding point 201 not contacting the support member 23.

[0096] It should be understood that the dimensions of the bottom guard plate 22 along its thickness direction (Z direction in the figure) and the dimensions of the support member 23 along the Z direction are not specifically limited in this application. For example, the dimensions of the bottom guard plate 22 along its thickness direction (Z direction in the figure) can be smaller than or equal to the dimensions of the support member 23 along the Z direction.

[0097] Welding the bottom protective plate 22 to the liquid cooling plate 21, located inside the fastener and not overlapping the support member 23, can improve the height space utilization of the battery box 20.

[0098] According to some embodiments of this application, optionally, the support member 23 and the bottom protective plate 22 are both attached to the surface of the liquid cooling plate 21 away from the receiving space, and the support member 23 and the bottom protective plate 22 are placed overlapping.

[0099] Figure 7 shows a cross-sectional view of another battery housing 20 according to an embodiment of this application along the X direction.

[0100] As shown in Figure 7, the support member 23 and the bottom protective plate 22 are placed overlapping, that is, the bottom protective plate 22 participates in the fixation of the fasteners. The bottom protective plate 22 is welded to the liquid cooling plate 21. The bottom protective plate 22, the inner wall of the support member 23 near the liquid cooling plate 21, the liquid cooling plate 21 and the extension 2421 are connected by fasteners.

[0101] The bottom protective plate 22 is welded to the liquid cooling plate 21. The bottom protective plate 22, the inner wall of the support member 23 near the liquid cooling plate 21, the liquid cooling plate 21, and the extension 2421 are connected by fasteners. Since the liquid cooling plate 21 and the bottom protective plate 22 are directly welded, the height space utilization of the battery box 20 can be improved.

[0102] According to some embodiments of this application, optionally, a sealing gasket or adhesive is provided between the liquid cooling plate 21 and the extension portion 2421.

[0103] Sealing gaskets or adhesives are placed around the fasteners to prevent water and dust from entering and to increase the sealing effect. Therefore, during the sealing process, sealing gaskets or adhesives are placed between the liquid cooling plate 21 and the extension 2421 to improve the sealing performance of the battery box 20.

[0104] According to some embodiments of this application, optionally, the accommodating space is used to accommodate a plurality of battery cells 25, wherein a pressure relief mechanism 251 (not shown in the figure) of the plurality of battery cells 25 is disposed on the housing of the plurality of battery cells 25 facing the liquid cooling plate 21.

[0105] It should be understood that the pressure relief mechanism 251 of the multiple battery cells 25 is disposed on the surface opposite to the electrode terminals of the multiple battery cells 25. In this application, the surface where the electrode terminals are disposed is the side close to the receiving space, and the pressure relief mechanism 251 is disposed on the side away from the receiving space, and is disposed on the outer shell of the multiple battery cells 25 facing the liquid cooling plate 21.

[0106] The design of the pressure relief mechanism 251 allows it to be close to the liquid cooling plate 21, facilitating the discharge of gas from the battery box 20.

[0107] According to some embodiments of this application, optionally, the liquid cooling plate 21 includes a flow channel 211 and a mounting groove 212. The mounting groove 212 has a hollow structure and is arranged sequentially near the flow channel 211. The projection of the pressure relief mechanism 251 in the thickness direction of the liquid cooling plate 21 is located within the projection of the mounting groove 212.

[0108] Referring to Figure 2, the flow channel 211 is arranged in an S-shape on the liquid cooling plate 21 for liquid transport to reduce the temperature in the battery box 20. The mounting groove 212 has a hollow structure and is arranged sequentially next to the S-shaped flow channel 211. The spacing between the mounting grooves 212 is related to the spacing between multiple battery cells 25. Specifically, the pressure relief structure 251 of multiple battery cells 25 is installed in the mounting groove 212 respectively. The projection of the pressure relief mechanism 251 in the thickness direction of the liquid cooling plate 21 is located within the projection of the mounting groove 212.

[0109] By setting the pressure relief mechanism 251 inside the mounting groove 212, the gas discharged when the pressure relief mechanism 251 regulates the temperature inside the battery box 20 is discharged through the mounting groove 212, which can regulate the temperature of the battery box 20 while ensuring good sealing performance.

[0110] According to some embodiments of this application, optionally, the battery housing also includes a gas collection device 26 (not shown in the figure), which is disposed on the battery housing 20 and is used to collect the gas discharged from the pressure relief mechanism 251 by the multiple battery cells 25.

[0111] Optionally, the gas collection device 26 can be installed on the liquid cooling plate 21 in the battery box 20, wherein the liquid cooling plate 21 is part of the accommodating space, wherein when the pressure relief mechanism 251 discharges gas, the gas collection device 26 collects the gas and discharges the gas through a pipe connected to the outside.

[0112] A gas collection device 26 is installed on the battery box 20. When the pressure relief mechanism 251 is adjusting the temperature inside the battery box 20, the gas discharged can be collected by the gas collection device 26, so that the temperature inside the battery box 20 reaches the normal value.

[0113] According to some embodiments of this application, optionally, the side of the bottom guard plate 22 includes a through hole 221 for discharging test liquid inside the battery box and a rivet nut 222 disposed on the through hole 221 for sealing the through hole 221.

[0114] Figure 8 shows a schematic diagram of the structure of some components of a battery case 20 according to an embodiment of the present application along the Y-axis direction. Figure 9 shows a schematic diagram of the structure of some components of another battery case 20 according to an embodiment of the present application. Figure 10 shows an exploded view of some components of another battery case 20 according to an embodiment of the present application. Figure 11 shows an exploded view of some components of another battery case 20 according to an embodiment of the present application. Figure 12 shows a schematic diagram of the structure of some components of a battery case 20 according to an embodiment of the present application along the Y-axis direction. Figure 13 shows an exploded view of some components of another battery case 20 according to an embodiment of the present application.

[0115] As shown in Figures 8 to 13, the assembly after welding the liquid cooling plate 21 and the bottom protective plate 22 needs to undergo insulation electrophoresis testing. Since liquid, i.e., residual test liquid, easily accumulates in the enclosed space around the assembly after welding the liquid cooling plate 21 and the bottom protective plate 22 during the insulation electrophoresis process, a through hole 221 is provided on the side of the bottom protective plate 22 to drain the accumulated liquid. After electrophoresis is completed, a blind hole rivet nut 222 is riveted onto the through hole 221 to achieve a seal. Optionally, the test liquid can also be the cleaning liquid remaining between the liquid cooling plate 21 and the bottom protective plate 22 after the liquid cooling plate 21 and the bottom protective plate 22 have been welded and before electrophoresis or powder coating.

[0116] Optionally, the liquid cooling plate 21 and the bottom protective plate 22 are subjected to insulating electrophoresis after welding, which helps to reduce the cost of shielding the welding area, while the appearance surface will not be exposed due to shielding.

[0117] According to some embodiments of this application, this application also provides a battery device including a plurality of battery cells; and a battery housing including any of the above embodiments, wherein the battery housing is used to accommodate the plurality of battery cells.

[0118] According to some embodiments of this application, this application also provides an energy storage device, including the battery device described in any of the above embodiments, the battery device being used to store or provide electrical energy.

[0119] According to some embodiments of this application, referring to Figures 2 and 3, this application provides a battery housing 20 for use in an energy storage device. The battery housing 20 includes a bottom protective plate 22 and a liquid cooling plate 21. The battery housing 20 has an internal receiving space. The liquid cooling plate 21 is used to close the opening below the receiving space and to regulate the temperature inside the receiving space. The bottom protective plate 22 is used to protect the battery housing 20. The bottom protective plate 22 is located on the side of the liquid cooling plate 21 away from the receiving space, and the edge of the bottom protective plate 22 is welded to the liquid cooling plate 21. Referring to Figures 3 to 5, the battery housing 20 also includes a support member 23 and a top cover 24. The support member 23 is disposed on the side of the liquid cooling plate 21 away from the receiving space. The top cover 24 includes a first cover plate 241 disposed opposite to the liquid cooling plate 21 and a second cover plate 242 disposed around the periphery of the first cover plate 241, so that the first cover plate 241, the second cover plate 242 and the liquid cooling plate 21 form the receiving space. The second cover plate 242 includes an extension portion 2421 disposed opposite to the liquid cooling plate 21 and extending toward the outside away from the receiving space. The inner wall of the support member 23 near the liquid cooling plate 21, the liquid cooling plate 21 and the extension portion 2421 are connected by fasteners. In this configuration, both the support member 23 and the bottom protective plate 22 are attached to the lower surface of the liquid cooling plate 21, and the support member 23 and the bottom protective plate 22 are placed side by side, or both the support member 23 and the bottom protective plate 22 are attached to the lower surface of the liquid cooling plate 21, and the support member 23 and the bottom protective plate 21 are placed overlapping. In energy storage applications, the energy storage device is usually placed in power plants or power transmission and distribution systems, etc. The bottom protective plate 22 experiences less wear and therefore does not need to be replaced frequently. Welding the edge of the bottom protective plate 22 to the liquid cooling plate 21 simplifies the process and reduces the number of fasteners and the sealing interface during the sealing process. It also eliminates the need for a sealing gasket or adhesive between the bottom protective plate 22 and the liquid cooling plate 21, improving the utilization rate of the height space of the battery box. In addition, welding the bottom protective plate 22 and the liquid cooling plate 21 instead of applying adhesive can improve the sealing performance of the battery box 20.

[0120] The housing space accommodates multiple battery cells 25, wherein pressure relief mechanisms 251 (not shown in the figure) for the multiple battery cells 25 are disposed on the outer shell of the multiple battery cells 25 facing the liquid cooling plate 21. The liquid cooling plate 21 includes a flow channel 211 and a mounting groove 212. The mounting groove 212 has a hollow structure and is arranged sequentially near the flow channel 211. The projection of the pressure relief mechanism 251 in the thickness direction of the liquid cooling plate 21 lies within the projection of the mounting groove 212. The battery housing also includes a gas collecting device 26, which is disposed on the battery housing 20 and is used to collect the gas discharged from the multiple battery cells 25 from the pressure relief mechanism 251. Through the design of the position of the pressure relief mechanism 251, the gas discharged from the pressure relief mechanism 251 is discharged from the mounting groove 212 of the liquid cooling plate, effectively regulating the temperature of the battery housing 20 while improving the sealing performance of the battery housing 20.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery housing, characterized in that, Applied to energy storage devices, the battery housing includes a bottom protective plate (22) and a liquid cooling plate (21), and the battery housing has an internal storage space. The liquid cooling plate (21) is used to regulate the temperature within the containment space; The bottom protective plate (22) is used to protect the battery box; The bottom protective plate (22) is located on the side of the liquid cooling plate (21) away from the accommodating space, and the edge of the bottom protective plate (22) is welded to the liquid cooling plate (21).

2. The battery housing according to claim 1, characterized in that, The projection of the bottom protective plate (22) in the thickness direction of the liquid cooling plate (21) is located within the projection of the liquid cooling plate (21) along the thickness direction.

3. The battery housing according to claim 1 or 2, characterized in that, The battery housing also includes a support (23) and a top cover (24). The support member (23) is disposed on the side of the liquid cooling plate (21) away from the receiving space. The upper cover (24) includes a first cover plate (241) disposed opposite to the liquid cooling plate (21) and a second cover plate (242) disposed around the periphery of the first cover plate (241), such that the first cover plate (241), the second cover plate (242) and the liquid cooling plate (21) form the receiving space. The second cover plate (242) includes an extension (2421) disposed opposite to the liquid cooling plate (21) and extending toward the outside of the receiving space, wherein the inner wall of the support member (23) near the liquid cooling plate (21), the liquid cooling plate (21) and the extension (2421) are connected by fasteners.

4. The battery housing according to claim 3, characterized in that, The support member (23) and the bottom protective plate (22) are both attached to the surface of the liquid cooling plate (21) away from the receiving space, and the support member (23) and the bottom protective plate (22) are placed side by side.

5. The battery housing according to claim 3, characterized in that, The support member (23) and the bottom protective plate (22) are both attached to the surface of the liquid cooling plate (21) away from the receiving space, and the support member (23) and the bottom protective plate (22) are placed overlapping each other.

6. The battery housing according to any one of claims 3 to 5, characterized in that, A sealing gasket or adhesive is provided between the liquid cooling plate (21) and the extension portion (2421).

7. The battery housing according to any one of claims 1 to 6, characterized in that, The accommodating space is used to accommodate multiple battery cells (25). The pressure relief mechanism (251) of the plurality of battery cells (25) is disposed on the outer shell of the plurality of battery cells (25) facing the liquid cooling plate (21).

8. The battery housing according to claim 7, characterized in that, The liquid cooling plate (21) includes a flow channel (211) and a mounting groove (212). The mounting groove (212) has a hollow structure and is arranged sequentially near the flow channel (211). The projection of the pressure relief mechanism (251) in the thickness direction of the liquid cooling plate (21) is located within the projection of the mounting groove (212).

9. The battery housing according to claim 7 or 8, characterized in that, The battery housing also includes a gas collection device (26), which is disposed on the battery housing and is used to collect the gas discharged from the pressure relief mechanism (251) by the plurality of battery cells (25).

10. The battery housing according to any one of claims 1 to 9, characterized in that, The side of the bottom protective plate (22) includes a through hole (221) for discharging test liquid inside the battery box and a rivet nut (222) provided on the through hole (221) for sealing the through hole (221).

11. A battery device, characterized in that, include: Multiple battery cells; as well as Battery housing as described in any one of claims 1 to 10, The battery housing is used to accommodate the plurality of individual battery cells.

12. An energy storage device, characterized in that, Includes the battery device as described in claim 11, the battery device being used to store or provide electrical energy.

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