Battery device and electric device

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a battery device and a power utilization device.The battery device comprises a battery box and a battery single body set arranged in the battery box, the battery single body set comprises a plurality of bag-type battery single bodies, and each bag-type battery single body is provided with a packaging bag and an electrode leading-out part; a first wall of a concrete structure is further arranged at the side part of the battery monomer group, a pressure relief channel communicated with the outside of the accommodating cavity is arranged on the first wall, the pressure relief channel is opposite to one part of each packaging bag and is staggered from the electrode leading-out part, and a pressure relief part is formed in the part, opposite to the pressure relief channel, of each packaging bag. High-temperature and high-pressure substances in the packaging bag can be discharged by breaking through the pressure relief part and are discharged to the outside of the accommodating cavity through the pressure relief channel, so that pressure relief is realized, and the reliability and the stability of the electrical property of the battery device can also be considered while the battery device uses a concrete structure for counterweight, so that the service life of the battery device is prolonged. And popularization and application of the battery device in the fields of heavy industrial machinery and the like are facilitated.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery device and an electrical device. Background Technology

[0002] With the rise of new energy equipment, represented by new energy vehicles, battery devices have become a key power source. In the field of heavy industrial machinery, in order to reduce energy consumption, heavy machinery is also gradually adopting battery devices to replace traditional energy sources.

[0003] In related technologies, to maintain overall balance during operation, heavy machinery can utilize concrete structures as battery boxes, or add concrete structures within the battery boxes, to achieve counterweighting. In practical applications, multiple battery cells need to be installed within a concrete battery box. The concrete structure may affect the normal pressure relief of the battery cells, increasing the probability of thermal runaway and leading to a decline in the overall performance of the battery system. Therefore, balancing the counterweight function of the concrete structure with the reliability and stability of the battery cells' electrical performance to improve the operational stability and reliability of the battery system is one of the key issues to consider when popularizing battery systems in the field of heavy industrial machinery.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of this application is to provide a battery device and an electrical device to improve the stability and reliability of battery devices used in heavy machinery in related technologies.

[0006] The technical solution adopted in the embodiments of this application is: In a first aspect, a battery device is provided, comprising: The battery box has a cavity; At least one set of battery cells is installed in the cavity. The battery cell set includes multiple pouch-shaped battery cells. Each pouch-shaped battery cell includes a packaging bag and an electrode lead-out portion extending from the packaging bag. The battery cell assembly also has a first wall on its side. The first wall has a pressure relief channel that communicates with the outside of the cavity. The pressure relief channel is offset from the electrode lead-out part. The part of the encapsulation bag is arranged opposite to the pressure relief channel to form a pressure relief part. The first wall is a concrete structure wall.

[0007] The battery device of this application embodiment includes a battery box and at least one set of battery cells. The battery box has a cavity, and the battery cells are installed in the cavity. The side of the battery cells is provided with a first wall, which is a concrete structure wall. The concrete structure has a large density, which can increase the overall weight of the battery device, thereby meeting the counterweight requirements when the battery device is used in heavy industrial machinery and other fields. In addition, the first wall is also provided with a pressure relief channel communicating with the outside of the cavity. The pressure relief channel is arranged opposite to a part of the packaging bag of each pouch battery cell. The part of the packaging bag opposite to the pressure relief channel can form a pressure relief part. When the pouch battery cell experiences thermal runaway, even if other parts of the packaging bag are blocked by other structures, the high-temperature and high-pressure substances inside the packaging bag can be discharged by breaking through the pressure relief part and discharged to the outside of the cavity through the pressure relief channel, thereby achieving effective pressure relief of the pouch battery cell. Furthermore, the pressure relief channel is staggered from the electrode lead-out part of the pouch battery cell used to lead out current, which can effectively reduce the risk of large-area pouch battery cell runaway or damage caused by thermal runaway of a single pouch battery cell. The stability and reliability of the battery device are improved, so that the battery device can take into account the reliability and stability of the battery device's electrical performance while using concrete structure for counterweight. This helps to promote the widespread application of the battery device in heavy industrial machinery and other fields.

[0008] In some embodiments, the packaging bag includes a first sealing portion and a second sealing portion connected to the first sealing portion, an electrode lead-out portion is disposed on the first sealing portion, and a portion of the second sealing portion is disposed opposite to the pressure relief channel to form a pressure relief portion.

[0009] By adopting the technical solution of this embodiment, compared with the first sealing edge of the lead electrode lead-out part, the sealing requirements of the second sealing edge part are relatively low, the tightness of the connection and the overall strength are relatively low. By setting the pressure relief channel and the second sealing edge part opposite to each other, the pressure relief part of the packaging bag is located in the second sealing edge part, the pressure relief part is easier to break through, and the pressure relief response is faster.

[0010] In some embodiments, the second sealing portion is disposed opposite to the pressure relief channel in the middle region along the length direction.

[0011] By adopting the technical solution of this embodiment, the middle position of the second sealing edge is relatively far from the first sealing edge and the electrode lead-out part. The pressure relief channel is set opposite to it, which can further improve the pressure relief response speed. At the same time, it can also separate the pressure relief channel from the electrode lead-out part, further reducing the probability of the emission material contacting the electrode lead-out part.

[0012] In some embodiments, the pouch-type battery cells of the same battery cell group are arranged sequentially along a first direction, and the pressure relief channel is a strip-shaped channel extending along the first direction. The pressure relief part of each pouch-type battery cell of the same battery cell group is correspondingly provided with the same pressure relief channel.

[0013] By adopting the technical solution of this embodiment, the same group of battery cells can share the same pressure relief channel, eliminating the need to design an independent channel for each pouch-type battery cell. This reduces the number of channels on the first wall, simplifies the structural design, and facilitates the processing and forming of the first wall.

[0014] In some embodiments, the battery device includes multiple sets of battery cells arranged sequentially along a direction perpendicular to a first direction. A first wall is provided with multiple pressure relief channels at intervals along the arrangement direction of the multiple sets of battery cells, and the multiple pressure relief channels are provided one-to-one with the multiple sets of battery cells.

[0015] By adopting the technical solution of this embodiment, a group of battery cells can be depressurized independently through a pressure relief channel. The battery cells will not affect or interfere with each other. If a pressure relief channel is depressurized, it can be directly connected to the corresponding battery cell, which facilitates the rapid location of the source of thermal runaway, shortens the inspection and maintenance time, and will not affect the normal operation of other battery cells during maintenance.

[0016] In some embodiments, the pressure relief channel is a groove formed by the inward recess of the surface of the first wall opposite to the pressure relief portion, and at least one end of the pressure relief channel along the first direction passes through the first wall and communicates with the outside of the cavity.

[0017] By adopting the technical solution of this embodiment, by providing a groove on the first wall that communicates with the outside of the cavity, the encapsulation bag portion of each pouch-type battery cell, i.e. the pressure relief portion, is arranged opposite to the groove, and the pouch-type battery cell can be punctured and depressurized through this portion.

[0018] In some embodiments, the pressure relief channel is a through hole that penetrates the first wall in a direction perpendicular to the first direction.

[0019] By adopting the technical solution of this embodiment, the pressure relief channel is a through hole that penetrates the first wall. One end of the pressure relief channel is directly opposite the pressure relief part of the packaging bag, and the other end directly discharges the exhaust material in the upper space of the pressure relief part. After the exhaust material enters the pressure relief channel, it forms an unobstructed exhaust path, and the pressure relief response is faster and more timely.

[0020] In some embodiments, the battery device further includes a power distribution device installed in the cavity, the power distribution device being disposed on the side of the battery cell pack along a first direction, the pressure relief channel being closed at the end adjacent to the power distribution device along the first direction, and the end of the pressure relief channel away from the power distribution device communicating with the outside of the cavity.

[0021] By adopting the technical solution of this embodiment, the emissions will not enter the installation space of the power distribution device through the pressure relief channel, thereby reducing the probability of contact between the emissions and the power distribution device and related conductive components such as the busbar components, further reducing the risk of internal short circuits, and helping to further improve the electrical stability and reliability of the battery device.

[0022] In some embodiments, the battery box is further provided with a pressure relief mechanism, which is located on the side of the battery cell pack, and the pressure relief channel is connected to the pressure relief mechanism.

[0023] By adopting the technical solution of this embodiment, the pressure relief channel is connected to the pressure relief mechanism on the battery box, and the pressure relief channel is connected to the outside of the battery box through the pressure relief mechanism on the battery box.

[0024] In some embodiments, the battery box is a concrete structure, the first wall is a side wall of the battery box relative to the battery cell group, and the pressure relief mechanism is embedded in the first wall and is disposed opposite to the pressure relief channel.

[0025] By adopting the technical solution of this embodiment, a concrete structure is used directly as the box structure of the battery device, which increases the overall weight of the battery device while making full use of the high hardness, strong impact resistance and good corrosion resistance of the concrete structure to provide physical and chemical protection for the internal structure.

[0026] In some embodiments, the battery box is a one-piece molded concrete structure.

[0027] In some embodiments, the battery box is a cement concrete structure.

[0028] In some embodiments, a protective component is also provided inside the cavity, the battery cell pack is encapsulated inside the protective component, the first wall is a side wall of the protective component that is disposed opposite to the battery cell pack, the protective component is a concrete structural component, and the pressure relief mechanism is disposed on the side of the protective component opposite to the pressure relief channel.

[0029] By adopting the technical solution of this embodiment, a protective component made of concrete structure is set inside the cavity to encapsulate the battery cell group, thereby providing protection for the battery cell group. The protective component is disassembled and installed separately as an independent part, which is convenient for inspection and maintenance. At the same time, different weight protective components can be replaced to meet different counterweight requirements.

[0030] In some embodiments, the cavity also has a buffer space connected to the pressure relief mechanism, the buffer space is located on the side of the protective member, and the pressure relief channel is connected to the buffer space.

[0031] By adopting the technical solution of this embodiment, the pressure relief channel guides the discharge material to the discharge cavity and into the buffer space of the battery box, where it is buffered. Finally, it is completely discharged to the outside of the battery device through the pressure relief mechanism located in the battery box. This can effectively reduce the temperature and pressure of the discharge material when it is discharged from the battery box, thereby reducing the impact of the discharge material on the surrounding structure of the battery device.

[0032] In some embodiments, the protective component is a one-piece molded concrete structural component.

[0033] In some embodiments, the protective component is a cement concrete structural component.

[0034] In some embodiments, the battery device further includes at least one flow guide cover, which is disposed between the battery cell group and the first wall along a second direction. The flow guide cover includes a flow guide portion, which is disposed on the side of the pressure relief portion along the second direction and adapted to be embedded in the pressure relief channel. The flow guide portion is recessed with a flow guide groove along the second direction. The pressure relief portion is disposed opposite to the flow guide groove. The flow guide groove extends along a first direction and communicates with the outside of the cavity. The second direction is perpendicular to the first direction.

[0035] By adopting the technical solution of this embodiment, by setting a flow guide, the position of the sealing bag corresponding to the pressure relief channel can be prevented from being covered by concrete, thus forming a pressure relief part. At the same time, the part of the flow guide corresponding to the pressure relief part forms a flow guide, and a flow guide groove extending along the extension direction of the pressure relief channel is formed on the flow guide. The discharge from each sealing bag can enter the flow guide groove, flow along the flow guide groove, i.e., the pressure relief channel, and be discharged out of the cavity. The setting of the flow guide will not affect the normal discharge of the discharge.

[0036] In some embodiments, the flow guide cover further includes connecting portions disposed on opposite sides of the flow guide portion, the connecting portions being connected to the packaging bag.

[0037] By adopting the technical solution of this embodiment, the flow guide and the sealing bag are connected and limited by the connecting part, reducing the probability of positional changes between the two and ensuring that the flow guide effectively blocks the concrete slurry. At the same time, the flow guide is connected and sealed to the sealing bag on the left and right sides of the pressure relief part, which can also isolate the fluid concrete from both sides, thereby reducing the risk of concrete slurry flowing into the flow channel from the gap between the flow guide and the sealing bag. This allows the flow guide to effectively cover the corresponding position of the sealing bag, thus forming a pressure relief part that is not covered by concrete.

[0038] In some embodiments, a sealing strip is provided between the connecting part and the packaging bag to achieve a sealed connection. In some embodiments, the dimension of the sealing strip along the first direction is not less than the dimension of the corresponding group of battery cells along the first direction.

[0039] By adopting the technical solution of this embodiment, the connecting part of the flow guide is indirectly sealed to the packaging bag through a sealing strip. The sealing strip can effectively seal the gap between the connecting part and the packaging bag, thereby better isolating the fluid concrete.

[0040] In some embodiments, the sealing strip is an elastic element.

[0041] By adopting the technical solution of this embodiment, the sealing strip can also buffer the impact force, which helps to reduce the impact of the concrete structure on the guide shield and the packaging bag, and reduce the risk of deformation and damage to the guide shield and the packaging bag.

[0042] In some embodiments, with the second direction as the projection direction, the projection of the flow guide covers each packaging bag.

[0043] By adopting the technical solution of this embodiment, the flow guide completely covers each bag-shaped battery cell from above the packaging bag along the second direction, reducing the risk of concrete slurry entering the assembly gap between adjacent packaging bags, thereby further reducing the risk of concrete slurry entering the flow guide channel and covering the pressure relief part.

[0044] In some embodiments, the two opposite sides of the flow guide along the third direction are folded and extended along the second direction to form a first shielding portion. Along the third direction, the two first shielding portions are respectively located on the two sides of the battery cell group. With the third direction as the projection direction, each first shielding portion shields the end of each packaging bag. The connecting portion is provided between the first shielding portion and the flow guide portion. The first direction, the second direction and the third direction are perpendicular to each other.

[0045] By adopting the technical solution of this embodiment, two first shielding parts are formed on the two sides of the flow guide. The two first shielding parts can shield the ends of each packaging bag near the flow guide, thereby shielding the assembly gap between adjacent packaging bags from the two sides in a third direction, further reducing the risk of concrete slurry covering the pressure relief part.

[0046] In some embodiments, the flow deflector is an insulating cover. By adopting the technical solution of this embodiment, the flow guide can serve as an insulating protective barrier to isolate the packaging bag from any conductive materials that may exist within the first wall.

[0047] In some embodiments, the battery device further includes a separator disposed between the shroud and the battery cell assembly along a second direction. The connecting portion is sealed to the separator, and the separator is connected to the packaging bag. With the second direction as the projection direction, the projection of the separator covers each packaging bag. The position of the separator relative to the flow channel can be disrupted to communicate with the flow channel.

[0048] By adopting the technical solution of this embodiment, a separator is provided on the side of the packaging bag to cover the concrete slurry, reducing the risk that the concrete slurry will flow in through the gap between adjacent packaging bags and cover the pressure relief part. At the same time, the part of the separator corresponding to the guide channel can be destroyed simultaneously when the pressure relief part is broken. Furthermore, the connecting part of the guide cover is sealed to the separator, so that the concrete slurry will not cover the part of the separator opposite to the guide channel. The setting of the separator does not affect the discharge of the waste.

[0049] In some embodiments, the two opposite sides of the separator along the third direction are folded and extended along the second direction to form a second shielding portion. Along the third direction, the two second shielding portions are respectively located on the two sides of the battery cell group. With the third direction as the projection direction, each second shielding portion shields the end of each packaging bag. The first direction, the second direction and the third direction are perpendicular to each other.

[0050] By adopting the technical solution of this embodiment, two second shielding parts are formed on the two sides of the separator. The two second shielding parts can shield the end of each packaging bag near the flow guide, thereby shielding the assembly gap between adjacent packaging bags from the two sides in the third direction, further reducing the risk of concrete slurry covering the pressure relief part.

[0051] In some embodiments, the separator is an insulating element. By adopting the technical solution of this embodiment, the separator can act as an insulating protective barrier to isolate the packaging bag from any conductive materials that may exist inside the first wall.

[0052] In some embodiments, the separator is a polypropylene separator, a polyethylene separator, or a polyethylene terephthalate separator.

[0053] Secondly, embodiments of this application also provide an electrical device, including a battery device as described in the above embodiments, the battery device being used to provide electrical energy.

[0054] The power device in this embodiment adopts the battery device of the above embodiments, and therefore has at least all the beneficial effects of the above battery devices, which will not be repeated here.

[0055] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application; Figure 2 This is an exploded view of a battery device in a related technology. Figure 3 This is a schematic diagram of the structure of a pouch-type battery cell in related technologies. Figure 4 Schematic diagrams of the battery device provided for some embodiments of this application; Figure 5 for Figure 4 An exploded view of the battery device shown; Figure 6 A front view of the battery device provided in the embodiments of this application; Figure 7 for Figure 6 The battery device shown is along Figure 6 Sectional view of line AA in the middle; Figure 8 for Figure 6 The battery device shown is along Figure 6 Sectional view of the middle BB line; Figure 9 for Figure 7 Enlarged view at point A in the middle; Figure 10 Exploded schematic diagrams of battery devices provided for other embodiments of this application; Figure 11 A front view of the assembly structure of the protective component and battery cell assembly of a battery device provided for further embodiments of this application; Figure 12 For along Figure 11 A cross-sectional view of the CC line; Figure 13 An exploded view of a battery device provided for further embodiments of this application; Figure 14 A cross-sectional view of a battery device provided for further embodiments of this application; Figure 15 A cross-sectional view of a battery device provided for further embodiments of this application.

[0058] The following are the labeling elements in the figure: 100. Vehicle; 101. Controller; 102. Motor; 200. Battery device; 10. Battery box; 1001. Cavity; 1002. Buffer space; 11a. First wall; 111. Pressure relief channel; 11. Pressure relief mechanism; 12. Protective component; 13. Shield; 131. Flow guide; 132. Flow guide groove; 133. Connecting part; 134. First shield; 135. Sealing gasket; 14. Sealing strip; 15. Separator; 151. Second shield; 16. Box body; 17. Cover; 20. Battery cell assembly; 21. Pouch-type battery cell; 211. Packaging bag; 211a. Pressure relief section; 2111. First sealing section; 2112. Second sealing section; 212. Electrode lead-out section; 30. Power distribution equipment; 40. Electrical connectors. Detailed Implementation To make the technical problem to be solved, the technical solution and the beneficial effects of this application clearer, the following is in conjunction with the appendix. Figures 1 to 15 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0060] 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. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0061] 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 some of the embodiments 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 in any suitable manner.

[0062] In the description of the embodiments in this application, 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 existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0063] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces). "Several" means one or more, unless otherwise explicitly specified.

[0064] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it may be directly connected to or indirectly connected to the other element.

[0067] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "proximity" refers to being close in location. For example, among three components A1, A2, and B, if the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1; that is, A2 is adjacent to B, or B is adjacent to A2. Similarly, when there are multiple components C, namely C1, C2, ... CN, if one component C, such as C2, is closer to component B than the other components C, then B is adjacent to C2, or C2 is adjacent to B.

[0068] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. In the heavy industrial machinery sector, to reduce energy consumption, heavy machinery is also gradually adopting battery devices to replace traditional energy sources. For example, excavators and mining trucks used in mining operations, as well as bulldozers and cranes used in engineering construction, have all begun to use power batteries as their energy source.

[0069] In related technologies, battery devices typically consist of individual battery cells and a battery housing to contain them. To maintain overall balance during operation, heavy machinery may use a concrete structure as the battery housing, or an additional concrete structure may be added inside the battery housing to provide counterweight. In practical applications, multiple battery cells need to be installed within a battery housing with a concrete structure. The concrete structure may interfere with the normal pressure relief of the battery cells, increasing the probability of thermal runaway and leading to a decline in the overall performance of the battery device. Therefore, balancing the counterweight function of the concrete structure with the reliability and stability of the battery cells' electrical performance to improve the reliability and stability of the battery device is one of the key issues that needs to be considered for the widespread adoption of battery devices in the field of heavy industrial machinery.

[0070] In some cases, taking a pouch-type battery cell as an example, it typically includes a packaging bag for encapsulating electrode components and electrolyte, as well as electrode leads that extend from the packaging bag for output current. During use, when the internal pressure of a pouch-type battery cell reaches a predetermined threshold, the high-temperature, high-pressure material inside the packaging bag needs to burst through the bag to release pressure. Thus, when a pouch-type battery cell is installed in a battery box with a concrete structure, on the one hand, the concrete structure may obstruct the packaging bag, preventing the discharge from bursting through the bag in a timely or normal manner, affecting the normal pressure release of the battery cell and increasing the risk of thermal runaway of the battery device; on the other hand, the obstruction by the concrete structure may also change the pressure release path, causing the high-temperature, high-pressure material to burst out from near electrical components such as the electrode leads. When a single battery cell experiences thermal runaway, the resulting discharge may fall onto surrounding electrical components, causing internal short circuits and resulting in damage to a large area of ​​battery cells.

[0071] Based on this, this application provides a battery device including a battery box and at least one set of battery cells. The battery box has a cavity, and the battery cells are installed in the cavity. The side of the battery cells is provided with a first wall, which is a concrete structure wall. The concrete structure has a large density, which can increase the overall weight of the battery device, thereby meeting the counterweight requirements when the battery device is used in heavy industrial machinery and other fields. In addition, the first wall is also provided with a pressure relief channel communicating with the outside of the cavity. The pressure relief channel is set opposite to a part of the packaging bag of each pouch battery cell. The part of the packaging bag opposite to the pressure relief channel can form a pressure relief part. When the pouch battery cell experiences thermal runaway, even if other parts of the packaging bag are blocked by other structures, the high-temperature and high-pressure substances inside the packaging bag can be discharged by breaking through the pressure relief part and discharged to the outside of the cavity through the pressure relief channel, thereby achieving effective pressure relief of the pouch battery cell. Furthermore, the pressure relief channel is staggered from the electrode lead-out part of the pouch battery cell used to draw out current, reducing the probability of the discharged material splashing or falling onto the electrode lead-out part and other conductive parts around it. This can effectively reduce the risk of thermal runaway of a single pouch battery cell leading to large-area pouch battery cell runaway or damage. The stability and reliability of the battery device are improved, allowing the battery device to use concrete structures for counterweight while also ensuring the reliability and stability of the battery device's electrical performance. This helps to promote the widespread application of the battery device in heavy industrial machinery and other fields.

[0072] The battery device provided in this application is applicable to electrical equipment that uses a battery device as a power source. The electrical equipment can be vehicles or ships, etc. Vehicles can be heavy industrial machinery such as excavators, mining trucks, bulldozers, cranes, backhoes, hoists, tractors, etc., or passenger cars or commercial vehicles. This application does not impose any special limitations on the aforementioned electrical equipment.

[0073] For ease of explanation, an electrical device is provided in one embodiment of this application, which is illustrated using a vehicle as an example.

[0074] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 100 provided in some embodiments of this application. The vehicle 100 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, or they can be trucks, excavators, cranes, tractors, etc., or passenger cars, commercial vehicles, etc. A battery device 200 is provided inside the vehicle 100, and the battery device 200 can be located at the bottom, front, or rear of the vehicle 100. The battery device 200 can be used to power the vehicle 100; for example, the battery device 200 can serve as the operating power source for the vehicle 100. The vehicle 100 may also include a controller 101 and a motor 102. The controller 101 is used to control the battery device 200 to supply power to the motor 102, for example, to meet the power needs of the vehicle 100 during starting, navigation, and driving.

[0075] In some embodiments, the battery device 200 can not only serve as the operating power source for the vehicle 100, but also as the driving power source for the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0076] In some embodiments, the battery device 200 may be positioned at a suitable location on the vehicle 100 as needed to balance the weight of various parts of the vehicle 100.

[0077] Please refer to Figure 2 This application provides a battery device 200. The battery device 200 may include one or more battery cell groups 20 for providing voltage and capacity. The battery cell group 20 may include multiple pouch-type battery cells 21, which are connected in series, parallel, or mixed via a busbar.

[0078] In some embodiments, the battery cell group 20 is formed by arranging a plurality of pouch-type battery cells 21.

[0079] As an example, the battery cell pack 20 can be a battery module, which is formed by arranging and fixing multiple pouch-type battery cells 21 to form an independent module. As an example, the battery module can be formed by limiting plates to confine multiple pouch-type battery cells 21 within a space.

[0080] In some embodiments, the battery device 200 may be a battery pack, which includes a battery case 10 and one or more battery cell groups 20, the battery cell groups 20 being housed in the battery case 10.

[0081] As an example, the battery cell pack 20 can be a battery module, which can be housed in the housing by fixing the battery module in the battery box 10.

[0082] As an example, the battery cell pack 20 can also be housed in the battery box 10 by directly fixing multiple pouch-type battery cells 21 to the battery box 10.

[0083] In some embodiments, the battery box 10 has an internal cavity 1001 to accommodate the pouch-type battery cells 21. The battery box 10 can be made of a material with a certain degree of hardness and strength, so that the battery box 10 is not easily deformed when subjected to compression or impact, enabling the battery device 200 to have higher structural strength and improved reliability. The battery box 10 can be made of various materials, including but not limited to aluminum, stainless steel, aluminum alloy, iron, plastic, or concrete.

[0084] As an example, the battery box 10 may include a first box section and a second box section, which are closed together to form a closed cavity 1001 inside the battery box 10 to accommodate the battery cell pack 20. Here, "closed" means covered or shut off; it can be sealed or unsealed. The first box section and the second box section may be the box cover or the bottom plate of the battery box 10, respectively. The first box section and the second box section may also be hollow structures with an opening on one side, with the opening side of the first box section covering the opening side of the second box section.

[0085] As an example, the battery box 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the box forms a closed space to accommodate the pouch-type battery cell pack 20.

[0086] In some embodiments, the battery box 10 may be part of the chassis structure of the vehicle 100. For example, a portion of the battery box 10 may be at least a portion of the floor of the vehicle 100, or a portion of the battery box 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 100.

[0087] In some embodiments, the pouch-type battery cell 21 can be a secondary battery cell, such as a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this application embodiment does not limit this. The pouch-type battery cell 21 can be flat, cuboid, or other shapes, etc., and this application embodiment does not limit this either.

[0088] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of a pouch-type battery cell 21 provided for some embodiments of this application.

[0089] In some embodiments, the pouch-type battery cell 21 refers to a battery cell obtained by encapsulating the electrode assembly using a flexible packaging film (such as aluminum-plastic film) as the encapsulation film.

[0090] As an example, a flexible encapsulation film forms an encapsulation bag 211 through encapsulation. The interior of the encapsulation bag 211 forms a pouch-shaped receiving space, within which the electrode assembly and electrolyte are encapsulated. One or more sides of the encapsulation bag 211 also have electrode leads 212 for connection to external electrical components, such as connecting to the electrode leads 212 of other pouch-shaped battery cells 21 via a busbar, thereby drawing out the current generated by the electrode assembly. The electrode assembly has tabs on one or both sides, with portions of the tabs extending out of the encapsulation bag 211 to form electrode leads. Alternatively, the tabs are connected to electrode leads, with portions of the electrode leads extending out of the encapsulation bag 211 to form electrode leads 212.

[0091] The following, in conjunction with the appendix Figures 2 to 15 The battery device 200 of this application will be described in detail below with specific embodiments. In the embodiments of this application, the first direction is the direction shown by arrow F1 in the figure, the second direction is the direction shown by arrow F2 in the figure, the third direction is the direction shown by arrow F3 in the figure, the thickness direction of the pouch-type battery cell is the first direction, the width direction is the second direction, and the length direction is the third direction.

[0092] Please see Figures 3 to 8 This application provides a battery device 200, which includes a battery box 10 and at least one set of battery cell groups 20. The battery box 10 has a cavity 1001. The battery cell groups 20 are installed in the cavity 1001. The battery cell groups 20 include a plurality of pouch-type battery cells 21. Each pouch-type battery cell 21 includes a packaging bag 211 and an electrode lead-out portion 212 extending from the packaging bag 211. The side of the battery cell group 20 is also provided with a first wall 11a. The first wall 11a is provided with a pressure relief channel 111 communicating with the outside of the cavity 1001. A portion of the packaging bag 211 is disposed opposite to the pressure relief channel 111 and forms a pressure relief portion 211a. The first wall 11a is a concrete structural wall.

[0093] In this embodiment, as Figures 3 to 5As shown, the battery device 200 includes a battery case 10 and a battery cell assembly 20. The battery case 10 has a cavity 1001, which is a closed cavity that provides protection for the battery cell assembly 20 inside. "Closed" can mean that the battery case 10 is a sealed box structure, preventing dust, moisture, etc., from entering the cavity 1001, thus providing good physical and chemical protection for the battery cell assembly 20. Alternatively, "closed" can also mean not completely sealed. The battery case 10 can be a one-piece molded structure or a structure formed by connecting multiple parts. For example, the battery case 10 may include a main body and a cover plate. The cover plate is connected to the opening of the main body and together with the main body forms the cavity 1001.

[0094] Understandably, the battery device 200 includes a battery cell pack 20, which includes a plurality of pouch-type battery cells 21. Each pouch-type battery cell 21 includes a packaging pouch 211 and an electrode lead-out portion 212 extending from at least one side of the packaging pouch 211. (Please refer to...) Figure 3 The pouch-type battery cell 21 refers to a battery cell obtained by encapsulating the electrode assembly with a flexible packaging film (such as aluminum-plastic film). The flexible packaging film forms a packaging bag 211 through encapsulation. The inside of the packaging bag 211 forms a pouch-shaped containing space. The electrode assembly and electrolyte are encapsulated in the pouch-shaped space. The electrode assembly has tabs on one or both sides. Part of the tabs or part of the electrode lead connected to the tabs extends from the side of the packaging bag 211 and forms an electrode lead 212. The electrode lead 212 is used to connect with external electrical components, thereby leading out the current generated by the electrode assembly.

[0095] Each pouch-type battery cell 21 has at least two electrode leads 212, namely, the electrode lead 212 includes at least one positive lead and at least one negative lead. The positive lead is part of the positive electrode tab of the electrode assembly inside the packaging pouch 211, or the positive lead is part of the electrode lead connected to the positive electrode tab of the electrode assembly. Similarly, the negative lead is part of the negative electrode tab of the electrode assembly inside the packaging pouch 211, or the negative lead is part of the electrode lead connected to the negative electrode tab of the electrode assembly.

[0096] The electrode lead-out portion 212 extends from the packaging bag 211, and the positive and negative electrode leads can extend from the same side of the packaging bag 211, that is, the positive and negative electrode leads are located on the same side of the packaging bag 211. Figure 5As shown, the positive electrode lead and the negative electrode lead can also be provided on different sides of the packaging bag 211. For example, when the pouch-type battery cell 21 adopts a wound electrode assembly, the electrode lead 212 can be provided on two sides of the axial direction of the packaging bag 211, that is, the positive electrode lead is led out from one side of the axial direction of the packaging bag 211 and the negative electrode lead is led out from the opposite side. For another example, when the pouch-type battery cell 21 adopts a stacked electrode assembly, the electrode lead 212 can be provided on two sides of the length or width direction of the packaging bag 211, that is, the positive electrode lead is led out from one side of the length (or width) direction of the packaging bag 211 and the negative electrode lead is led out from the opposite side. Alternatively, the electrode lead 212 can also be provided on two adjacent sides of the packaging bag 211.

[0097] In the embodiments of this application, such as Figure 3 and Figure 5 As shown, for the pouch-type battery cell 21, its encapsulation bag 211 is a soft encapsulation film. Therefore, it is usually difficult to install pressure relief components such as pressure relief valves or explosion-proof valves on the encapsulation bag 211. In actual use, weak points with low structural strength are usually set in local locations of the encapsulation film. When the pouch-type battery cell 21 experiences thermal runaway, the high-temperature and high-pressure material inside the encapsulation bag 211 can break through the weak point to release pressure. Here, the weak point refers to the part that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the encapsulation bag 211 reaches a predetermined threshold. The design of this threshold varies depending on the design requirements. This threshold may depend on the material composition of the electrode components in the pouch-type battery cell 21. The internal pressure of the pouch-type battery cell 21 is the pressure inside the encapsulation bag 211 of the pouch-type battery cell 21. As an example, the weak point can be formed by setting grooves, reducing the thickness, or using materials with lower strength. "Actuation" means that the weak point is activated or moved to a certain state, thereby allowing the internal pressure of the encapsulation bag 211 to be released. The actions caused by the weak point can include, but are not limited to, the weak point cracking, breaking, or tearing. When the weak point is actuated, the high-temperature, high-pressure substances inside the packaging bag 211 are discharged outward from the actuated part as waste. In this way, the pressure of the pouch-type battery cell 21 can be released under controllable pressure. The waste discharged from the packaging bag 211 includes, but is not limited to, electrolyte, dissolved or broken positive and negative electrode plates, fragments of the separator, high-temperature, high-pressure gases generated by the reaction, flames, etc.

[0098] In the embodiments of this application, such as Figures 6 to 8As shown, the side of the battery cell assembly 20 is also provided with a first wall 11a. The first wall 11a can be the cavity wall of the cavity 1001, or it can be the wall structure of other structural components provided in the cavity 1001. The first wall 11a is provided with a pressure relief channel 111. The pressure relief channel 111 is partially positioned opposite to the packaging bag 211. That is, each packaging bag 211 has a portion of its area facing the pressure relief channel 111. This portion of its area forms the pressure relief part 211a of each packaging bag 211. When the pressure or temperature inside the packaging bag 211 of the pouch-type battery cell 21 reaches a predetermined threshold, the high-temperature and high-pressure material inside the packaging bag 211 can break through the pressure relief part 211a. After breaking through the pressure relief part 211a, the discharge enters the pressure relief channel 111. The pressure relief channel 111 can guide the discharge discharged from the packaging bag 211 to the discharge cavity 1001, thereby achieving pressure relief.

[0099] The pressure relief section 211a refers to a portion of the packaging bag 211 that is opposite to the pressure relief channel 111. This portion can be a weak point of the packaging bag 211, or it can have the same strength as other parts of the packaging bag 211. Only this portion is not blocked by other structures such as concrete structural members because it is opposite to the pressure relief channel 111, so that the high-temperature and high-pressure material inside the packaging bag 211 can break through and release pressure at this location. The pressure relief channel 111 refers to a channel structure provided on the first wall 11a for guiding the discharge material discharged from the pressure relief section 211a. For example, the pressure relief channel 111 can be a groove or through hole provided on the first wall 11a. The pressure relief channel 111 is connected to the outside of the cavity 1001. For example, the pressure relief channel 111 directly penetrates the external space of the battery box 10, or the pressure relief channel 111 is indirectly connected to the external space of the battery box 10 through a pressure relief structure such as a pressure relief valve or an exhaust valve provided on the battery box 10, so that the discharge material discharged from the pressure relief section 211a of the packaging bag 211 can enter the channel and be discharged to the outside of the cavity 1001 under the guidance of the channel.

[0100] The staggered arrangement of the pressure relief channel 111 and the electrode lead-out portion 212 means that the pressure relief channel 111 and the electrode lead-out portion 212 are not spatially connected or have any opposite parts. The pressure relief channel 111 and the electrode lead-out portion 212 are completely separated, so that the discharge from the pressure relief portion 211a can directly enter the pressure relief channel 111 without contacting the electrode lead-out portion 212. As an example, the electrode lead-out portion 212 extends from one side of the packaging bag 211, and the pressure relief channel 111 is arranged opposite to another opposite or adjacent side of the packaging bag 211 and a part of the packaging bag 211 (i.e., the pressure relief portion 211a). The pressure relief channel 111 and the electrode lead-out portion 212 do not overlap spatially. Alternatively, the electrode lead-out portion 212 may also be blocked by the wall of the first wall 11a, and there is no part of mutual communication between it and the pressure relief channel 111. The two are separated by the wall of the first wall 11a.

[0101] Understandably, in this embodiment, the number of pressure relief channels 111 can be one or more. When there is only one pressure relief channel 111, each of the packaging bags 211 of all the pouch-type battery cells 21 inside the cavity 1001 has a portion opposite to the pressure relief channel 111, so that the discharge from any packaging bag 211 can enter the same pressure relief channel 111 and be discharged to the outside of the cavity 1001. Alternatively, multiple pressure relief channels 111 can be provided on the first wall 11a, wherein each pressure relief channel 111 is disposed opposite to at least one portion of a packaging bag 211, i.e., the pressure relief portion 211a. In some examples, a pressure relief channel 111 is configured corresponding to the pressure relief section 211a of a packaging bag 211. When a single pouch battery cell 21 experiences thermal runaway, the emissions can be directly discharged through the dedicated pressure relief channel 111, which helps to shorten the emission path and improve efficiency. In other examples, multiple packaging bags 211 have their pressure relief sections 211a corresponding to the same pressure relief channel 111. When the pressure relief sections 211a of multiple pouch battery cells 21 are close together or require zoned management, one pressure relief channel 111 can cover multiple pressure relief sections 211a. For example, a group of battery cells 20 is formed by multiple pouch battery cells 21 arranged in sequence. The pressure relief sections 211a of all pouch battery cells 21 in the group of battery cells 20 face the same strip-shaped area of ​​the first wall 11a. A pressure relief channel 111 with a length adapted to the length of the group of battery cells 20 is set in this area. This channel can discharge the emissions discharged from any of the corresponding packaging bags 211 to the outside of the cavity 1001.

[0102] In this embodiment, the first wall 11a is a concrete structural component, meaning it is a wall structure made of concrete. The concrete structural component refers to a composite material structural component where aggregates are bound together by a cementing material. Depending on the cementing material, concrete can include cement concrete, gypsum concrete, silicate concrete, water glass concrete, asphalt concrete, polymer concrete, etc. For example, cement concrete uses cement as the cementing material, sand and gravel as aggregates, and water (which may contain admixtures and additives) in a certain proportion, mixed to obtain concrete. Concrete structures have a simple manufacturing process, low cost, and high structural strength and weight.

[0103] The first wall 11a can be a structural component integrally formed from concrete, or it can be a wall structure assembled from multiple concrete blocks. The concrete structure has a high density, which helps increase the overall weight of the battery device 200, thereby achieving the goal of balancing the structural weight of heavy machinery and reducing the amount of counterweight blocks needed. For example, the first wall 11a can be a cement concrete structural wall, which gives it high structural strength and a large overall weight to meet counterweight requirements. Furthermore, using cement concrete allows for a simple, convenient, and low-cost one-time casting process.

[0104] In a specific embodiment, the battery box 10 can be a concrete structure. The inner wall of the battery box 10 forms a cavity 1001. Part or all of the inner wall facing the battery cell is a first wall 11a. Alternatively, a concrete block can be placed inside the cavity 1001 of the battery box 10. The concrete block is located on the side of the battery cell group 20 and has at least a part located on the side of the pressure relief part 211a of the packaging bag 211. Part or all of the concrete block forms the first wall 11a. The concrete block can be integrally formed in the battery box 10 or it can be separately connected to the battery box 10.

[0105] The battery device 200 of this application embodiment has a first concrete wall 11a on the side of the battery cell group 20. The concrete structure has a high density, which can increase the overall weight of the battery device 200, thereby meeting the counterweight requirements when the battery device 200 is used in heavy industrial machinery and other fields. In addition, the first wall 11a is also provided with a pressure relief channel 111 communicating with the outside of the cavity 1001. The pressure relief channel 111 is arranged opposite to a part of the packaging bag 211 of each pouch battery cell 21. The part of the packaging bag 211 opposite to the pressure relief channel 111 can form a pressure relief part 211a. When the pouch battery cell 21 experiences thermal runaway, even if other parts of the packaging bag 211 are blocked by other structures, the high temperature and high pressure substances inside the packaging bag 211 can be discharged to the outside of the cavity 1001 by breaking through the pressure relief part 211a and through the pressure relief channel 111, thereby achieving effective pressure relief of the pouch battery cell 21. The electrode lead 212 of the pouch cell 21, which is used to draw current, is staggered from the electrode lead 212 of the pouch cell 21. This reduces the probability of emissions splashing or falling onto the electrode lead 212 and other conductive parts around it. This effectively reduces the risk of thermal runaway of a single pouch cell 21 leading to large-area failure or damage to pouch cells 21. The stability and reliability of the battery device 200 are improved, allowing it to maintain reliable and stable electrical performance even when using concrete structures for counterweight. This facilitates the widespread application of the battery device 200 in heavy industrial machinery and other fields. For example, in some heavy trucks or vans, when the battery device 200 provided in this embodiment is used for energy supply, it can act as a counterweight to balance the weight of other structures in the vehicle body, thereby improving the vehicle's balance.

[0106] In some embodiments, such as Figure 3 , Figure 5 and Figure 7 As shown, the packaging bag 211 includes a first sealing portion 2111 and a second sealing portion 2112 connected to the first sealing portion 2111. The electrode lead-out portion 212 is provided on the first sealing portion 2111. At least a portion of the second sealing portion 2112 is disposed opposite to the pressure relief channel 111 and forms a pressure relief portion 211a.

[0107] In this embodiment, the encapsulation bag 211 is heat-sealed using an encapsulation film such as aluminum-plastic film. After the electrode assembly is inserted into the encapsulation bag 211, the encapsulation film will heat-seal the side of the lead-out electrode lead-out portion 212 of the encapsulation bag 211. This sealed portion is the first sealed portion 2111. After the lead-out electrode lead-out portion 212 is led out from the first sealed portion 2111, the area needs to be sealed a second time (such as hot melt adhesive sealing) to prevent the fluid electrolyte, such as electrolyte liquid, from leaking from the gap between the lead-out electrode lead-out portion 212 and the encapsulation film. In addition, after the electrode assembly is put into the bag, it is also necessary to heat-seal the other side of the electrode assembly so that the encapsulation bag 211 forms a sealed bag structure. This sealed position is the second sealed portion 2112. After the bag-shaped battery cell 21 is formed, the second sealed portion 2112 corresponds to the narrow side of the bag-shaped battery cell 21. Thus, compared to the first sealing edge 2111 of the lead electrode lead-out portion 212, the sealing requirements of the second sealing edge 2112 are relatively low, and the tightness of the connection and the overall strength are relatively low. By partially aligning the pressure relief channel 111 with the second sealing edge 2112, the pressure relief portion 211a of the encapsulation bag 211 is located in the second sealing edge 2112, making the pressure relief portion 211a easier to break through and the pressure relief response more rapid.

[0108] Understandably, the electrode lead-out portion 212 being located on the first sealing edge portion 2111 means that the packaging bag 211 may include one first sealing edge portion 2111, with the positive electrode lead-out portion and the negative electrode lead-out portion extending from the same side of the packaging bag 211, i.e., the same first sealing edge portion 2111. Alternatively, the packaging bag 211 may also include two first sealing edge portions 2111, with the positive electrode lead-out portion and the negative electrode lead-out portion extending from two different sides of the packaging bag 211, i.e., two different first sealing edge portions 2111. As an example, the packaging bag 211 includes two first sealing edge portions 2111 spaced apart and a second sealing edge portion 2112 connecting the two first sealing edge portions 2111, with the positive electrode lead-out portion and the negative electrode lead-out portion respectively located on the two first sealing edge portions 2111.

[0109] In a specific embodiment, such as Figure 5 and Figure 7 As shown, the second sealing portion 2112 is positioned opposite the pressure relief channel 111 in the middle region along the length direction.

[0110] In this embodiment, the middle position of the second sealing portion 2112 is relatively far from the first sealing portion 2111, resulting in lower strength and density. This makes it more suitable for structural weakening designs. The pressure relief channel 111 is positioned opposite it, further improving the pressure relief response speed. Furthermore, the middle position of the second sealing portion 2112 is also far from the electrode lead-out portion 212, thus separating the pressure relief channel 111 from the electrode lead-out portion 212 and further reducing the probability of the emitted material contacting the electrode lead-out portion 212.

[0111] In some embodiments, such as Figures 6 to 8 As shown, the battery box 10 is also provided with a pressure relief mechanism 11, which is located on the side of the battery cell group 20, and the pressure relief channel 111 is connected to the pressure relief mechanism 11.

[0112] In this embodiment, the battery box 10 is also provided with a pressure relief mechanism 11. The pressure relief channel 111 is connected to the pressure relief mechanism 11, and the pressure relief channel 111 is connected to the outside of the battery box 10 through the pressure relief mechanism 11. The discharge from the packaging bag 211 is guided to the pressure relief mechanism 11 through the pressure relief channel 111. The pressure relief mechanism 11 can be opened or broken under the impact of the discharge, thereby discharging the discharge to the outside of the battery device 200.

[0113] The battery box 10 is equipped with a pressure relief mechanism 11, which is located on the box structure of the battery box 10, such as on the box wall of the battery box 10. The pressure relief mechanism 11 can be an explosion-proof valve, gas valve, pressure relief valve, safety valve or thinned structural part, etc., located on the box structure of the battery box 10.

[0114] Of course, in other embodiments, the pressure relief mechanism 11 may not be provided on the battery box 10. The pressure relief channel 111 directly penetrates the side wall of the battery box 10 and communicates with the outside of the cavity 1001. The discharged material is directly discharged to the outside of the battery box 10 through the pressure relief channel 111.

[0115] In some embodiments, such as Figures 5 to 8 As shown, each pouch-type battery cell 21 of the same battery cell group 20 is arranged sequentially along the first direction. The pressure relief channel 111 is a strip-shaped channel extending along the first direction. The pressure relief part 211a of each pouch-type battery cell 21 of the same battery cell group 20 is correspondingly provided with the same pressure relief channel 111.

[0116] In this embodiment, the pressure relief channel 111 is a strip-shaped channel with a certain length. Each pouch-type battery cell 21 of the same group of battery cells 20 is arranged sequentially along the first direction. The portion of the encapsulation bag 211 of each pouch-type battery cell 21, i.e. the pressure relief portion 211a, corresponds to the same pressure relief channel 111, so that the same group of battery cells 20 can share the same pressure relief channel 111. In this way, it is not necessary to design an independent pressure relief channel 111 for each pouch-type battery cell 21, which can reduce the number of channels on the first wall 11a, simplify the structural design, and facilitate the processing and forming of the first wall 11a.

[0117] In a specific embodiment, the battery device 200 includes multiple sets of battery cell groups 20, which are arranged sequentially along a direction perpendicular to the first direction. The first wall 11a is provided with multiple pressure relief channels 111 at intervals along the arrangement direction of the multiple sets of battery cell groups 20, and the multiple pressure relief channels 111 are arranged one-to-one with the multiple sets of battery cell groups 20.

[0118] In this embodiment, multiple battery cell groups 20 are arranged sequentially. The first wall 11a is provided with multiple pressure relief channels 111, and each pressure relief channel 111 corresponds to one of the multiple battery cell groups 20. This allows each battery cell group 20 to independently relieve pressure through a pressure relief channel 111, and the battery cell groups 20 will not affect or interfere with each other. If a certain pressure relief channel 111 is depressurized, it can be directly connected to its corresponding battery cell group 20, which facilitates the rapid location of the source of thermal runaway, shortens the inspection and maintenance time, and does not affect the normal operation of other battery cell groups 20 during maintenance.

[0119] In some embodiments, such as Figures 5 to 8 As shown, the pressure relief channel 111 is a groove formed by the inward recess of the surface of the first wall 11a and the pressure relief part 211a. At least one end of the pressure relief channel 111 passes through the first wall 11a along the first direction and communicates with the outside of the cavity 1001.

[0120] In this embodiment, the pressure relief channel 111 is a groove provided on the surface of the first wall 11a facing the battery cell group 20. One or both ends of the groove are connected to the outside of the cavity 1001 along the first direction. The portion of the packaging bag 211 of each bag-type battery cell 21, namely the pressure relief part 211a, is arranged opposite to the groove. After the discharge material discharged from the packaging bag 211 enters the groove, namely the pressure relief channel 111, it flows along the first direction and is discharged under the guidance of the pressure relief channel 111.

[0121] Wherein, the pressure relief channel 111 having at least one end in the first direction penetrating the first wall 11a and communicating with the outside of the cavity 1001 means that the pressure relief channel 111 can be configured to communicate with the outside of the cavity 1001 through one end in its length direction, or the pressure relief channel 111 can also be configured to communicate with the outside of the cavity 1001 through opposite ends in its length direction.

[0122] In a specific embodiment, the first wall 11a can completely surround the entire battery cell group 20, that is, the battery cell group 20 is completely surrounded by the concrete structure. For example, the battery cell group 20 is encapsulated in the protective component 12 of the concrete structure, or the battery cell group 20 is encapsulated in the battery box 10 of the concrete structure.

[0123] In this way, the entire battery cell 20 is completely enclosed and sealed inside the concrete structure. The first wall 11a can block, cover or enclose the battery cell 20 in space by wrapping, enclosing or covering it through its own structural form, so that the battery cell 20 is within the coverage area of ​​the first wall 11a, thus providing effective protection for the battery cell 20. The setting of the concrete structure can not only play the role of counterweight and protection of the battery cell 20, but also will not affect the normal pressure relief of the pouch-type battery cell 21.

[0124] In a specific embodiment, such as Figure 6 and Figure 8 As shown, the battery device 200 also includes a power distribution device 30 installed in the cavity 1001. The power distribution device 30 is disposed on the side of the battery cell group 20 along the first direction. The end of the pressure relief channel 111 adjacent to the power distribution device 30 along the first direction is closed, and the end of the pressure relief channel 111 away from the power distribution device 30 is connected to the outside of the cavity 1001.

[0125] In this embodiment, a power distribution device 30 is provided inside the battery box 10. The power distribution device 30 is electrically connected to the battery cell group 20 through a busbar. The power distribution device 30 is used to distribute electrical energy to the battery cell group 20. The battery box 10 is also provided with an electrical connector 40. The power distribution device 30 is electrically connected to the electrical connector 40, thereby enabling electrical energy interaction with external devices.

[0126] In this embodiment, the power distribution device 30 is disposed within the cavity 1001 and is located on one side of the battery cell group 20 along the first direction. The pressure relief channel 111 is closed at the end adjacent to the power distribution device 30 along the first direction, reducing the probability of emissions entering the installation space of the power distribution device 30 through the pressure relief channel 111. This reduces the probability of emissions contacting the power distribution device 30 and related conductive components such as the busbar, further reducing the risk of internal short circuits and helping to further improve the electrical stability and reliability of the battery device 200.

[0127] As an example, such as Figure 6 and Figure 8 As shown, a sealing gasket 135 is provided at the end of the pressure relief channel 111 facing the power distribution device 30. One end of the sealing gasket 135 is sealed to the encapsulation bag 211 of the adjacent pouch-type battery cell 21, and the other part of the sealing gasket 135 is sealed to the channel wall of the pressure relief channel 111, so that the pressure relief channel 111 can be closed by the sealing gasket 135, and the discharge is isolated in the pressure relief channel 111 by the sealing gasket 135. In this example, for the structure of the integrally cast first wall 11a, such as the integrally cast protective component 12 or the battery box 10, before pouring concrete, one end of the sealing gasket 135 can be sealed to the corresponding encapsulation bag 211 by means of bonding or welding, and the size of the part of the sealing gasket 135 extending from the encapsulation bag 211 can be set to match the size of the integrally cast pressure relief channel 111, and then the concrete can be poured.

[0128] In some embodiments, such as Figures 5 to 9 As shown, the battery device 200 also includes at least one flow guide shroud 13. The flow guide shroud 13 is disposed between the battery cell group 20 and the first wall 11a along the second direction. The flow guide shroud 13 includes a flow guide portion 131. The flow guide portion 131 is disposed on the side of the pressure relief portion 211a along the second direction and is adapted to be embedded in the pressure relief channel 111. The flow guide portion 131 is recessed with a flow guide groove 132 along the second direction. The pressure relief portion 211a is disposed opposite to the flow guide groove 132. The flow guide groove 132 extends along the first direction and communicates with the outside of the cavity 1001 through the pressure relief channel 111. The second direction is perpendicular to the first direction.

[0129] In this embodiment, as Figure 6 , Figure 7 and Figure 9 As shown, the battery device 200 also includes a flow guide shroud 13, which is encapsulated inside the battery box 10. Along a second direction perpendicular to the first direction, the flow guide shroud 13 is located between the battery cell group 20 and the first wall 11a. The flow guide shroud 13 includes a flow guide portion 131. Along the second direction, the flow guide portion 131 can cover a portion of the packaging bag 211. The covered area of ​​the packaging bag 211 is within the coverage of the flow guide shroud 13. In this way, the flow guide shroud 13 can block the flowing concrete material from the second direction. When the first wall 11a of the concrete structure is poured, the concrete material poured in from the second direction is effectively blocked by the flow guide shroud 13, so that a portion of the packaging bag 211 is not covered by the concrete material. This unconcrete-covered area forms the pressure relief portion 211a.

[0130] Based on this, the portion of the flow guide 13 located on the side of the pressure relief portion 211a along the second direction, i.e. the portion covering the pressure relief portion 211a, serves as the flow guide portion 131. The flow guide portion 131 is embedded in the pressure relief channel 111 and is provided with a flow guide groove 132 that is recessed into the pressure relief channel 111. The flow guide groove 132 is correspondingly provided with the pressure relief portion 211a of the packaging bag 211. After the discharge material in the packaging bag 211 breaks through the pressure relief portion 211a, it can enter the flow guide groove 132, and then flow along the pressure relief channel 111 in the flow guide groove 132 and be discharged to the outside of the cavity 1001.

[0131] Thus, by setting the flow guide shroud 13, the position of the sealing bag 211 corresponding to the pressure relief channel 111 is not covered by concrete, thereby forming a pressure relief part 211a. At the same time, the part of the flow guide shroud 13 corresponding to the pressure relief part 211a forms a flow guide part 131. The flow guide part 131 is adapted to be embedded in the pressure relief channel 111, that is, the shape and size of the flow guide part 131 are basically the same as the pressure relief channel 111, so that a flow guide groove 132 extending along the extension direction of the pressure relief channel 111 can be formed on the flow guide part 131. Along the extension direction of the pressure relief channel 111, i.e. the first direction, the flow guide groove 132 is correspondingly set with each pressure relief part 211a. The discharge from each sealing bag 211 can enter the flow guide groove 132, flow along the flow guide groove 132, i.e. the pressure relief channel 111, and be discharged to the outside of the cavity 1001. The setting of the flow guide shroud 13 will not affect the normal discharge of the discharge.

[0132] In this embodiment, it is understood that the battery device 200 further includes at least one flow guide shroud 13, meaning that the number of flow guide shrouds 13 can be one or more, and the number of flow guide shrouds 13 is the same as the number of pressure relief channels 111, such that one flow guide shroud 13 corresponds to one pressure relief channel 111. As an example, when the battery device 200 includes a group of battery cells 20, the number of flow guide shrouds 13 is one; when the battery device 200 includes multiple groups of battery cells 20, the number of flow guide shrouds 13 is the same as the number of battery cells 20, and multiple flow guide shrouds 13, multiple pressure relief channels 111, and multiple battery cells 20 are arranged in a one-to-one correspondence.

[0133] In some embodiments, such as Figure 6 , Figure 7 and Figure 9 As shown, the flow guide shroud 13 also includes connecting portions 133 on opposite sides of the flow guide portion 131, and the connecting portions 133 are connected to the packaging bag 211.

[0134] In this embodiment, the flow guide 13 is connected to the packaging bag 211 on both sides of the flow guide 131 through the connecting part 133. The flow guide 13 and the packaging bag 211 can be connected and limited through the connecting part 133, reducing the probability of positional changes between the two and ensuring that the flow guide 13 effectively blocks the concrete slurry.

[0135] In a specific embodiment, the connecting part 133 is sealed to the packaging bag 211. That is, the flow guide 13 is sealed to the packaging bag 211 on the left and right sides of the pressure relief part 211a. It can also isolate the fluid concrete from both sides, thereby reducing the risk of concrete slurry flowing into the flow guide groove 132 from the gap between the flow guide 13 and the packaging bag 211. This allows the flow guide 13 to effectively cover the corresponding position of the packaging bag 211, thus forming a pressure relief part 211a that is not covered by concrete.

[0136] It can be understood that the connection between the connecting part 133 and the packaging bag 211 can be sealed, either by the direct connection between the connecting part 133 and the packaging bag 211, or by the indirect connection between the connecting part 133 and the main body packaging bag 211.

[0137] In some examples, the connector 133 is sealed against the packaging bag 211.

[0138] That is, the portion of the flow guide 13 facing the surface of the packaging bag 211 forms a connecting portion 133, which corresponds to the two sides of the pressure relief portion 211a and abuts against the packaging bag 211. In this way, the connecting portion 133 is directly connected to the packaging bag 211, which is simple and convenient for assembly.

[0139] In other examples, such as Figure 6 , Figure 7 and Figure 9 As shown, a sealing strip 14 is provided between the connecting part 133 and the packaging bag 211 to achieve a sealed connection.

[0140] That is, a sealing strip 14 is also sandwiched between the flow guide 13 and the packaging bag 211. The part of the flow guide 13 facing the surface of the packaging bag 211 forms a connecting part 133 which is connected to one side of the sealing strip 14. The packaging bag 211 is connected to the other side of the sealing strip 14. The connecting part 133 is indirectly sealed to the packaging bag 211 through the sealing strip 14.

[0141] Thus, the flow guide 13 and the packaging bag 211 are sealed together by the sealing strip 14, which can effectively seal the gap between the connection part 133 and the packaging bag 211, thereby better isolating the fluid concrete.

[0142] The dimension of the sealing strip 14 along the first direction is not less than the dimension of the corresponding group of battery cells 20 along the first direction. That is, along the first direction, the opposite ends of the sealing strip 14 extend beyond the corresponding packaging bag 211, meaning that the dimension of the sealing strip 14 along the first direction is greater than the sum of the stacked dimensions of the packaging bags 211 of each bag-type battery cell 21 in the same group of battery cells 20. This allows the packaging bags 211 of each bag-type battery cell 21 in the same group of battery cells 20 to be sealed and connected to the flow guide 13 through the same sealing strip 14, thereby reducing the number of sealing strips 14 and simplifying the structural design.

[0143] In some embodiments, the sealing strip 14 is an elastic element.

[0144] That is, the flow guide 13 is elastically and sealed to the packaging bag 211 through the elastic sealing strip 14. The sealing strip 14 can also buffer the impact force, which helps to reduce the impact of the concrete structure on the flow guide 13 and the packaging bag 211, and reduce the risk of deformation and damage to the flow guide 13 and the packaging bag 211.

[0145] The sealing strip 14 can be made of elastic rubber, silicone, or foam.

[0146] In some embodiments, the battery device 200 further includes a separator 15, which is disposed between the flow guide 13 and the battery cell group 20 along a second direction. The connecting portion 133 is connected to the separator 15, and the separator 15 is connected to the packaging bag 211. With the second direction as the projection direction, the projection of the separator 15 covers each packaging bag 211. The position of the separator 15 relative to the flow guide 132 can be disrupted to communicate with the flow guide 132.

[0147] In related technologies, since there may be assembly gaps between adjacent packaging bags 211, if concrete is poured directly, the concrete slurry may flow to the surface of the pressure relief part 211a through the assembly gap under the influence of capillary action, etc. The concrete covering the pressure relief part 211a makes it difficult for the pressure relief part 211a to be broken in time.

[0148] Based on this, in this embodiment, a separator 15 is provided on the side of the packaging bag 211 along the second direction. The flow guide shroud 13 is indirectly connected to the packaging bag 211 through the separator 15. The projection of the separator 15 covers the battery cell group 20. The separator 15 can cover the upper part of the battery cell group 20 to block the concrete slurry, reducing the risk that the concrete slurry will flow in through the gap between adjacent packaging bags 211 and cover the pressure relief part 211a. At the same time, the part of the separator 15 corresponding to the flow guide groove 132 can be destroyed along with the pressure relief part 211a when it is broken. The setting of the separator 15 does not affect the discharge of the effluent.

[0149] In a specific embodiment, the connecting part 133 of the flow guide shroud 13 is sealed to the separator 15, and the separator 15 is sealed to the packaging bag 211, so that the concrete slurry will not cover the part of the separator 15 opposite to the flow guide 132.

[0150] In this embodiment, it can be understood that the position of the separator 15 relative to the guide channel 132 can be destroyed to communicate with the guide channel 132, which means that when the pressure relief part 211a of the packaging bag 211 is punctured, the position of the separator 15 relative to the guide channel 132 can be broken, fractured or torn, so that the discharge discharged from the pressure relief part 211a can pass through the separator 15 and be discharged into the guide channel 132. When the separator 15 is destroyed, high temperature and high pressure substances can be discharged into the guide channel 132 from the destroyed part, so that the discharge discharged from the packaging bag 211 can be further discharged to the outside of the cavity 1001 through the pressure relief channel 111 under controllable pressure. As an example, the separator 15 can be a structural component made of a material that is easily broken by high-temperature and high-pressure emissions. Alternatively, a weak part can be formed by grooves or thinning at the position opposite to the guide channel 132. Or, an opening, notch, or through hole can be provided at the position opposite to the guide channel 132 for the emissions to pass through.

[0151] In some embodiments, such as Figure 6 , Figure 7 and Figure 9 As shown, the two opposite sides of the separator 15 along the third direction are folded and extended along the second direction to form a second shielding part 151. Along the third direction, the two second shielding parts 151 are respectively located on the two sides of the battery cell pack 20. With the third direction as the projection direction, each second shielding part 151 shields the end of each packaging bag 211. The first direction, the second direction and the third direction are perpendicular to each other.

[0152] In this embodiment, the two sides of the separator 15 extend beyond the two sides of the packaging bag 211 and are folded to form two second shielding portions 151. The two second shielding portions 151 are located on the two sides of the packaging bag 211 along the third direction. The second shielding portions have a certain length along the second direction, so that they can shield the end of each packaging bag 211 near the flow guide 13, thereby shielding the assembly gap between adjacent packaging bags 211 from the two sides in the third direction, further reducing the risk of concrete slurry covering the pressure relief portion 211a.

[0153] For example, in a specific embodiment, the first direction is the thickness direction of the pouch-type battery cell 21, the second direction is the width direction, and the third direction is the length direction. Each pouch-type battery cell 21 of the same group of battery cells 20 is stacked sequentially along the thickness direction of the encapsulation bag 211, i.e., the first direction. The surfaces formed by the width direction of each encapsulation bag 211, i.e. the second direction, and the length direction, i.e. the third direction, are opposite to each other. There is an assembly gap between adjacent encapsulation bags 211 that is parallel to the length direction, i.e. the third direction. In this way, the second shielding part 151 is located on both sides of the encapsulation bag 211 along the length direction of the encapsulation bag 211 and shields the end of the assembly gap near the guide groove 132. When the concrete slurry is poured down from the top of the encapsulation bag 211 along the second direction, i.e. the width direction of the encapsulation bag 211, the guide cover 13 can provide an effective shielding from above.

[0154] In some embodiments, the separator 15 is an insulating element. In this embodiment, the first wall 11a is a concrete structure. In actual applications, it may have a metal reinforcement structure inside or may contain metal debris. The separator 15 is set as an insulating component made of insulating material. The separator 15 can serve as an insulating protective barrier to isolate the packaging bag 211 from the conductive substances that may exist inside the first wall 11a.

[0155] As an example, the separator 15 is a polypropylene separator, a polyethylene separator, or a polyethylene terephthalate separator. This allows the separator 15 to effectively shield the concrete while also providing insulation. Furthermore, the portion of this type of separator opposite the flow channel 132 is easily ruptured by high-temperature, high-pressure emissions without affecting the normal pressure relief of the encapsulation bag 211.

[0156] Of course, in other embodiments, the separator 15 may also be a ceramic separator or a plastic separator, and a weak part such as a groove or a through hole or opening may be provided at the position opposite to the guide groove 132 for pressure relief.

[0157] In other embodiments, such as Figure 10 As shown, unlike the above embodiments, the battery device 200 may also exclude the separator 15, with the projection direction being the second direction, and the projection of the flow guide 13 covering each packaging bag 211.

[0158] Thus, along the second direction, a flow guide 13 is provided in the upper space of the packaging bag 211. The projection of the flow guide 13 covers each packaging bag 211 of the same group of battery cells 20. That is, the flow guide 13 completely covers each bag-shaped battery cell 21 from above the packaging bag 211 along the second direction. This can also reduce the risk of concrete slurry entering the assembly gap between adjacent packaging bags 211, thereby reducing the risk of concrete slurry entering the flow guide 132 and covering the pressure relief part 211a.

[0159] In this embodiment, as Figure 10 As shown, the flow guide 13 folds and extends along the second direction on two opposite sides of the third direction to form a first shielding part 134. Along the third direction, the two first shielding parts 134 are respectively located on two sides of the battery cell pack 20. With the third direction as the projection direction, each first shielding part 134 shields the end of each packaging bag 211. The connecting part 133 is provided between the first shielding part 134 and the flow guide part 131. The first direction, the second direction and the third direction are perpendicular to each other.

[0160] In this embodiment, the two sides of the flow guide 13 extend beyond the two sides of the packaging bag 211 and are folded to form two first shielding portions 134. The two first shielding portions 134 are located on the two sides of the packaging bag 211 along the third direction. The first shielding portions have a certain length along the second direction, so that they can shield the ends of each packaging bag 211 near the flow guide 13, thereby shielding the assembly gap between adjacent packaging bags 211 from the two sides in the third direction, further reducing the risk of concrete slurry covering the pressure relief portion 211a.

[0161] For example, in a specific embodiment, the first direction is the thickness direction of the pouch-type battery cell 21, the second direction is the width direction, and the third direction is the length direction. Each pouch-type battery cell 21 of the same group of battery cells 20 is stacked sequentially along the thickness direction of the encapsulation bag 211, i.e., the first direction. The surfaces formed by the width direction of each encapsulation bag 211, i.e. the second direction, and the length direction, i.e. the third direction, are opposite to each other. There is an assembly gap between adjacent encapsulation bags 211 that is parallel to the length direction, i.e. the third direction. In this way, the first shielding part 134 is located on both sides of the encapsulation bag 211 along the length direction of the encapsulation bag 211 and shields the end of the assembly gap near the guide groove 132. When concrete slurry is poured down from above the encapsulation bag 211 along the second direction, i.e. the width direction of the encapsulation bag 211, the guide cover 13 can provide an effective shielding above.

[0162] In a specific embodiment, the flow guide 13 is an insulating cover. The flow guide 13 can serve as an insulating protective barrier, isolating the packaging bag 211 from any conductive materials that may be present in the first wall 11a.

[0163] As an example, the fairing 13 can be a ceramic insulating cover, a rigid plastic insulating cover, or the like, with a certain structural strength.

[0164] Unlike the embodiments described above, in other embodiments, such as Figure 11 and Figure 12 As shown, the pressure relief channel 111 is a through hole that penetrates the first wall 11a in a direction perpendicular to the first direction.

[0165] In this embodiment, the first wall 11a avoids the local positions of each packaging bag 211, and this avoidance position forms the pressure relief part 211a. The pressure relief channel 111 is a through hole that penetrates the first wall 11a, that is, the pressure relief channel 111 completely penetrates the first wall 11a. One end of the pressure relief channel 111 is directly opposite the pressure relief part 211a of the packaging bag 211, and the other end directly discharges the exhaust material in the upper space of the pressure relief part 211a. After the exhaust material enters the pressure relief channel 111, it forms an unobstructed exhaust path, and the pressure relief response is faster and more timely.

[0166] As an example, the end of the pressure relief channel 111 away from the packaging bag 211 is directly connected to the pressure relief mechanism 11, or the end of the pressure relief channel 111 away from the packaging bag 211 is indirectly connected to the pressure relief mechanism 11 through another space such as the buffer space 1002, which is provided inside the battery box 10 and located outside the cavity 1001.

[0167] In a specific embodiment, the first wall 11a covers all parts of each pouch-type battery cell 21 except for the pressure relief part 211a. The first wall 11a can provide protection for other parts of the pouch-type battery cell without blocking the pressure relief part 211a.

[0168] In some embodiments, such as Figures 6 to 8 as well as Figure 12 and Figure 13 As shown, a protective component 12 is also provided inside the cavity 1001. The battery cell group 20 is encapsulated inside the protective component 12. The first wall 11a is the side wall of the protective component 12 relative to the battery cell group 20. The protective component 12 is a concrete structure. The pressure relief mechanism 11 is arranged opposite to the pressure relief channel 111 on the side of the protective component 12.

[0169] In this embodiment, a concrete protective component 12 is installed inside the cavity 1001 to encapsulate the battery cell assembly 20, providing protection for the battery cell assembly 20. The protective component 12 is located between the pouch-shaped battery box 10 and the box wall and the battery cell assembly 20. The first wall 11a is the side wall of the protective component 12 relative to the battery cell assembly 20, i.e., the first wall 11a is located on the protective component 12. The protective component 12 is a component separately installed inside the battery box 10. For example, the protective component 12 can be a concrete block built into the cavity 1001. The pressure relief mechanism 11 is located on the side of the protective component 12 and is opposite to the pressure relief channel 111, so that the discharge in the pressure relief channel 111 can be directly discharged towards the pressure relief mechanism 11. In this way, a separate protective component 12 is installed inside the cavity 1001. The protective component 12 is an independent component that can be disassembled and installed separately, which is convenient for inspection and maintenance. At the same time, different weights of protective components 12 can be replaced to meet different counterweight requirements.

[0170] The protective component 12 can be connected to the battery box 10. For example, the protective component 12 can be connected to the wall of the battery box 10 by fasteners such as screws or bolts. Alternatively, the protective component 12 can be embedded in the cavity 1001 by snap-fit ​​or plug-in.

[0171] In a specific embodiment, such as Figure 6 , Figure 7 and Figure 13 As shown, the protective component 12 is a one-piece molded concrete structure. That is, the protective component 12 is integrally cast inside the cavity 1001. In this way, the protective component 12 can cover the structure inside the cavity 1001. For example, the protective component 12 can cover the battery cell group 20, so that only the part of each encapsulation bag 211 opposite to the pressure relief channel 111, i.e., the pressure relief part 211a, is not blocked by the concrete structure, thus making this position easier to be broken through.

[0172] In actual production, the other structures inside the cavity 1001, except for the protective component 12, are installed and fixed inside the cavity 1001. Then, concrete is poured into the gaps of the cavity 1001 using a casting process. The concrete material fills the gaps inside the cavity 1001 and forms the protective component 12.

[0173] Of course, in other embodiments, the protective element 12 includes multiple interconnected parts, such as a first part and a second part interconnected, with the battery cell assembly 20 encapsulated between the first part and the second part.

[0174] The protective component 12 comprises two independently formed parts. The first part and the second part are disposed in the cavity 1001 and connected to each other. The battery cell pack 20 is encapsulated inside the first part and the second part. The first part and the second part can provide good physical and chemical protection for the internal battery cell pack 20. The encapsulation can be sealed or unsealed.

[0175] The first part and the second part can be structural components pre-formed using concrete material. They are first formed on the outside of the battery box 10 and then installed into the cavity 1001. Alternatively, the first part and the second part can be integrally formed inside the cavity 1001 using a mold.

[0176] In a specific embodiment, such as Figure 6 , Figure 8 and Figure 13As shown, the battery box 10 includes a box body 16 and a cover 17, which are connected to each other. A battery cell assembly 20 is disposed within a cavity 1001 formed by the box body 16 and the cover 17. A portion of the protective member 12 is located between the box body 16 and the battery cell assembly 20, and another portion is located between the cover 17 and the battery cell assembly 20. The protective member 12 can be connected and fixed to the box body 16, or it can be connected and fixed to the cover 17, or it can be connected to both the box body 16 and the cover 17 simultaneously. The box body 16 and the cover 17 can be made of materials such as metal or plastic.

[0177] Please combine them together Figure 12 In some other embodiments, unlike the embodiments described above, the cavity 1001 also has a buffer space 1002 that communicates with the pressure relief mechanism 11. The buffer space 1002 is located on the side of the protective member 12, and the pressure relief channel 111 communicates with the buffer space 1002.

[0178] In this embodiment, a buffer space 1002 is also provided inside the battery box 10. A pressure relief channel 111 is connected to the buffer space 1002. The pressure relief channel 111 guides the discharge material to the discharge cavity 1001 and into the buffer space 1002 of the battery box 10. The material is buffered in the space and then completely discharged to the outside of the battery device 200 through the pressure relief mechanism 11 provided in the battery box 10. In this way, the temperature and pressure of the discharge material when it is discharged from the battery box 10 can be effectively reduced, thereby reducing the impact of the discharge material on the surrounding structure of the battery device 200.

[0179] The buffer space 1002 is a space located inside the battery box 10 but outside the cavity 1001.

[0180] As an example, such as Figure 12 As shown, when the battery box 10 includes a box body 16 and a cover 17, the pressure relief mechanism 11 and the buffer space 1002 can be provided on the cover 17, or the pressure relief mechanism 11 and the buffer space 1002 can also be provided on the box body 16.

[0181] In the above embodiments, the protective component 12 is a cement concrete structural component. That is, the protective component 12 is made of cement concrete, which has high structural strength and a large overall weight, thus meeting the strength and counterweight requirements. Furthermore, cement concrete can be manufactured by pre-curing or by integral casting in one piece, making the manufacturing process simple, convenient, and inexpensive.

[0182] like Figure 14 As shown, in some other embodiments, unlike the embodiments described above, the battery box 10 is a one-piece molded concrete structure.

[0183] In this embodiment, the external box structure of the battery device 200 is a concrete structural member. This concrete structural member is a hollow component, and the hollow part inside forms the internal space of the cavity 1001, which is used to accommodate the internal structure including the battery cell group 20. The first wall 11a is the inner side wall of the battery box 10 facing the battery cells. In this way, by using a concrete structure directly as the box structure of the battery device 200, the overall weight of the battery device 200 is increased, while the high hardness, strong impact resistance, and good corrosion resistance of the concrete structure can be fully utilized to provide physical and chemical protection for the internal structure.

[0184] As an example, the battery box 10 can be a cement concrete structure. Cement concrete is readily available, inexpensive, and has high structural strength and density, meeting the usage requirements.

[0185] The battery box 10 is a concrete structure, and the pressure relief mechanism 11 is embedded in the wall of the battery box 10.

[0186] Understandably, in specific implementations, the battery box 10 can be a one-piece cast concrete structure. When assembling the battery device 200, a mold adapted to the structure of the battery box 10 is first provided, and the structure inside the cavity 1001, including the battery cell group 20, is fixed inside the mold. Then, concrete slurry is poured into the mold, and the mold is removed after the concrete slurry has solidified.

[0187] Alternatively, in other embodiments, such as Figure 15 As shown, the battery box 10 may also include a box body 16 and a cover 17 connected to each other. The box body 16 and the cover 17 form a cavity 1001. Both the box body 16 and the cover 17 are concrete structural components.

[0188] That is, the battery box 10 is a separate component, including a box body 16 and a cover 17. The box body 16 has a cavity 1001 with an opening on one side. The cover 17 is connected to the box body 16 and is adapted to cover the opening of the cavity 1001. The battery cell group 20 is installed in the cavity 1001. The pressure relief mechanism 11 is embedded in the box body 16 or the cover 17. The box body 16 and the cover 17 are both concrete structural components. The box body 16 and the cover 17 are produced separately. During the assembly stage, the box body 16 and the cover 17 are connected into a whole by a connection process or connection structure to obtain the battery box 10.

[0189] In this way, the main body 16 and the cover 17 can be manufactured independently, making the design more flexible and convenient. Furthermore, the cover 17 and the main body 16 can be connected in a detachable manner, which facilitates the inspection and maintenance of the internal battery cell pack 20.

[0190] Another embodiment of this application also provides an electrical device, such as... Figure 1 As shown, it includes a battery device 200 as provided in any of the above embodiments, the battery device 200 being used to provide electrical energy.

[0191] The power device in this embodiment, since it adopts the battery device 200 of any of the above embodiments, has at least all the beneficial effects of the battery device 200, which will not be repeated here.

[0192] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0193] 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 device, characterized by, The battery device comprises: a battery box having a cavity; at least one group of battery monomers installed in the cavity, the group of battery monomers comprising a plurality of pouch-type battery monomers, the pouch-type battery monomers comprising a packaging bag and an electrode lead-out portion led out from the packaging bag; wherein the side of the group of battery monomers is further provided with a first wall, the first wall being provided with a pressure relief channel in communication with the outside of the cavity, the pressure relief channel being arranged away from the electrode lead-out portion, a portion of the packaging bag being arranged opposite to the pressure relief channel and forming a pressure relief portion, and the first wall being a concrete structure wall.

2. The battery device of claim 1, wherein: The packaging bag comprises a first sealing edge portion and a second sealing edge portion connected to the first sealing edge portion, the electrode lead-out portion being arranged at the first sealing edge portion, and a portion of the second sealing edge portion being arranged opposite to the pressure relief channel and forming the pressure relief portion.

3. The battery device of claim 2, wherein: A middle region of the second sealing edge portion is arranged opposite to the pressure relief channel.

4. The battery device of claim 1, wherein: The pouch-type battery monomers of the same group of battery monomers are sequentially arranged along a first direction, the pressure relief channel being a strip-shaped channel arranged along the first direction, and the pressure relief portions of the pouch-type battery monomers of the same group of battery monomers being arranged corresponding to the same pressure relief channel.

5. The battery device of claim 4, wherein: The battery device comprises a plurality of groups of battery monomers, the plurality of groups of battery monomers being sequentially arranged along a direction perpendicular to the first direction, the first wall being provided with a plurality of pressure relief channels arranged at intervals along the arrangement direction of the plurality of groups of battery monomers, and the plurality of pressure relief channels being arranged corresponding to the plurality of groups of battery monomers one by one.

6. The battery device of claim 4, wherein: The pressure relief channel is a groove formed by inwardly recessing a surface of the first wall opposite to the pressure relief portion, and at least one end of the pressure relief channel along the first direction penetrates through the first wall and communicates with the outside of the cavity. Alternatively, the pressure relief channel is a through hole penetrating through the first wall along a direction perpendicular to the first direction.

7. The battery device of claim 4, wherein: The battery device further comprises a power distribution device installed in the cavity, the power distribution device being arranged at the side of the group of battery monomers along the first direction, an end of the pressure relief channel adjacent to the power distribution device being closed along the first direction, and the other end of the pressure relief channel being in communication with the outside of the cavity.

8. The battery device of claim 6, wherein: The battery box is further provided with a pressure relief mechanism arranged at the side of the group of battery monomers, and the pressure relief channel is in communication with the pressure relief mechanism.

9. The battery device of claim 8, wherein: The battery box is a concrete structure, the first wall is a side wall of the battery box arranged opposite to the group of battery monomers, and the pressure relief mechanism is embedded in the first wall and arranged opposite to the pressure relief channel.

10. The battery device of claim 9, wherein: The battery box is an integrally formed concrete structure.

11. The battery device of claim 9, wherein: The battery box is a cement concrete structure.

12. The battery device of claim 8, wherein: The cavity is further provided with a protective member, the group of battery monomers is encapsulated in the protective member, the first wall is a side wall of the protective member arranged opposite to the group of battery monomers, the protective member is a concrete structure, and the pressure relief mechanism is arranged opposite to the pressure relief channel at the side of the protective member.

13. The battery device of claim 12, wherein: The cavity further has a buffer space in communication with the pressure relief mechanism, the buffer space being arranged at the side of the protective member, and the pressure relief channel being in communication with the buffer space.

14. The battery device of claim 12, wherein: The protective member is a one-piece concrete structure.

15. The battery device of claim 12, wherein: The protective member is a cement concrete structure.

16. The battery device according to any one of claims 4 to 15, characterized by: The battery device further comprises at least one fairing, the fairing is arranged between the battery monomer groups and the first wall along a second direction, the fairing comprises a fairing part, the fairing part is arranged on the side of the pressure relief part along the second direction and is adapted to be embedded in the pressure relief channel, the fairing part is concavely provided with a fairing groove along the second direction, the pressure relief part is arranged opposite to the fairing groove, the fairing groove is arranged along the first direction and is in communication with the outside of the cavity, and the second direction is perpendicular to the first direction.

17. The battery device of claim 16, wherein: The fairing further comprises a connecting part arranged on opposite sides of the fairing part, and the connecting part is connected with the packaging bag.

18. The battery device of claim 17, wherein: A sealing strip is arranged between the connecting part and the packaging bag to realize sealed connection.

19. The battery device of claim 18, wherein: The size of the sealing strip along the first direction is not less than the size of a group of battery monomer groups corresponding to the sealing strip along the first direction.

20. The battery device of claim 18, wherein: The sealing strip is an elastic member.

21. The battery device of claim 17, wherein: The projection of the fairing covers each packaging bag in the second direction as the projection direction.

22. The battery device of claim 21, wherein: The opposite two side parts of the fairing along a third direction are folded and extended along the second direction to form a first shielding part, and along the third direction, the two first shielding parts are respectively located on the two side parts of the battery monomer groups, each first shielding part shields the end part of each packaging bag in the third direction as the projection direction, the connecting part is arranged between the first shielding part and the fairing part, and the first direction, the second direction and the third direction are perpendicular to each other.

23. The battery device of claim 16, wherein: The fairing is an insulating cover.

24. The battery device of claim 17, wherein: The battery device further comprises a partition, the partition is arranged between the fairing and the battery monomer groups along the second direction, the connecting part is connected with the partition, the partition is connected with the packaging bag, the projection of the partition covers each packaging bag in the second direction as the projection direction, and the position opposite to the fairing groove of the partition can be damaged to communicate with the fairing groove.

25. The battery device of claim 24, wherein: The opposite two side parts of the partition along a third direction are folded and extended along the second direction to form a second shielding part, and along the third direction, the two second shielding parts are respectively located on the two side parts of the battery monomer groups, each second shielding part shields the end part of each packaging bag in the third direction as the projection direction, and the first direction, the second direction and the third direction are perpendicular to each other.

26. The battery device of claim 24, wherein: The partition is an insulating member.

27. The battery device of claim 24, wherein: The partition is a polypropylene partition film, a polyethylene partition film or a polyethylene terephthalate partition film.

28. An electrical device, comprising: The battery device comprises any one of claims 1-27, and the battery device is used for providing electric energy.

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