Battery device and electric appliance

Abstract

Embodiments of the present application provide a battery device and an electric device. The battery device includes a case, a battery cell assembly, and a pressing member. The case forms an accommodation space, and the battery cell assembly is accommodated in the accommodation space. The battery cell assembly includes a plurality of battery cells. Each battery cell includes a shell and an electrode assembly accommodated in the shell. The shell includes a first wall located on one side of the shell along a first direction. A portion of the first wall is recessed to form a recessed portion toward an interior of the shell along the first direction. A portion of the first wall that is not recessed forms a protruding portion. The battery cell further includes a pressure relief mechanism disposed in the recessed portion. The case has a second wall. The pressure relief mechanism faces the second wall along the first direction. Along the first direction, one side of the pressing member is connected to the protruding portion, and the other side of the pressing member is connected to the second wall to form an exhaust space between the second wall and the pressure relief mechanism. The battery device is advantageous in reducing the requirement for the thickness of the pressing member, thereby reducing the cost.

Description

Technical Field

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

[0002] In existing technologies, battery devices typically include a housing and multiple battery cells housed within it. Each battery cell is equipped with a pressure relief mechanism configured to open when the internal pressure exceeds a threshold, thereby releasing pressure and reducing the risk of cell explosion. Therefore, sufficient venting space is required between the battery cell's pressure relief mechanism and the housing to improve venting efficiency. Currently, battery devices typically incorporate a pressure-blocking member on the wall where the battery cell's pressure relief mechanism is located. This member connects to the battery cell and supports the housing, creating a venting space between the housing and the pressure relief mechanism. Since the size of this venting space affects the venting efficiency of the battery cell, the pressure-blocking member needs a certain thickness to meet venting requirements. In other words, the size requirements of the venting space constrain the thickness of the pressure-blocking member, making it difficult to make it thinner and further reducing the cost of the battery device. Utility Model Content

[0003] In view of this, embodiments of this application provide a battery device and an electrical appliance designed to reduce the thickness of the pressure member, thereby reducing the cost of the battery device.

[0004] A first aspect of this application provides a battery device including a housing, a battery cell assembly, and a pressure member. The housing has a receiving space, within which the battery cell assembly is housed. The battery cell assembly includes multiple battery cells, each battery cell including a housing and an electrode assembly housed within the housing. The housing includes a first wall located on one side of the housing along a first direction. A portion of the first wall is recessed inward along the first direction to form a recess, and a non-recessed portion of the first wall forms a protrusion. The battery cell also includes a pressure relief mechanism disposed in the recess. The housing has a second wall, with the pressure relief mechanism facing the second wall along the first direction, and a venting space formed between the second wall and the pressure relief mechanism. Along the first direction, one side of the pressure member is connected to the protrusion.

[0005] In the embodiments of this application, by providing a pressure-retaining member between the battery cell and the second wall, it is beneficial to reduce the risk of the second wall deforming and encroaching on the exhaust space; by providing the pressure relief mechanism of the battery cell in the recessed part and the pressure-retaining member in the protruding part, a larger exhaust space can be left between the pressure relief mechanism and the second wall of the housing, which is beneficial to reduce the requirement for the thickness of the pressure-retaining member, thereby reducing costs.

[0006] In one or more embodiments of this application, the other side of the pressing member is connected to the second wall. Thus, the pressing member can provide support for the second wall, which helps reduce the risk of deformation of the second wall.

[0007] In one or more embodiments of this application, the other side of the pressing member is bonded to the second wall. This helps to improve the positional stability of the pressing member and reduce the risk of misalignment or displacement of the pressing member.

[0008] In one or more embodiments of this application, the battery cell assembly is arranged in multiple rows, each row of the battery cell assembly includes multiple battery cells arranged along a second direction, the second direction being perpendicular to the first direction; the battery device also includes a limiting member, the limiting member being connected to the housing, the battery cell assembly being sandwiched between two limiting members along the second direction, and the pressing member being connected to the two limiting members at opposite ends along the second direction.

[0009] In this embodiment, connecting the pressing member and the limiting member improves the limiting member's ability to resist expansion force; furthermore, the connection between the pressing member and the limiting member constrains the battery cell assembly, which helps to increase the main frequency of the battery device.

[0010] In one or more embodiments of this application, the pressure-relief member is an elongated structure extending along the second direction, with multiple pressure-relief members spaced apart, and each row of battery cell assembly corresponds to at least one pressure-relief member; along the first direction, at least a portion of the pressure relief mechanism is not blocked by the pressure-relief member.

[0011] In this embodiment, multiple pressure members are provided, which helps to further improve the anti-expansion capability of the limiting member and further improve the main frequency of the battery device; in addition, the pressure members are spaced apart, which helps to save materials.

[0012] In one or more embodiments of this application, the pressure member is a plate-like structure extending along a second direction. The pressure member includes a first part and a second part connected to each other. The first part is connected to the protrusion. Along the first direction, the second part is separated from the pressure relief mechanism, and an exhaust space is formed between the second part and the pressure relief mechanism.

[0013] In this embodiment, the pressing member is provided with a plate-like structure, which helps to improve the strength of the pressing member, thereby improving the anti-expansion effect of the limiting member.

[0014] In one or more embodiments of this application, the second portion is connected to the second wall. This increases the contact area between the pressing member and the second wall, thereby improving the supporting effect of the pressing member on the second wall.

[0015] In one or more embodiments of this application, the second portion is bonded to the second wall. This improves the overall integrity of the battery device, thereby increasing the main frequency of the battery device.

[0016] In one or more embodiments of this application, the battery device further includes a fastener, which includes a first connecting portion and a second connecting portion. The first connecting portion is connected to one end of the second connecting portion along a first direction. A pressing member has a first hole, and a limiting member has a second hole. The second connecting portion passes through the first hole and the second hole and is detachably connected to the limiting member. The first connecting portion presses against the pressing member.

[0017] In this embodiment, the pressing member and the limiting member are detachably connected by fasteners, which helps to improve the convenience of installing and removing the pressing member and reduce the maintenance cost of the battery device.

[0018] In one or more embodiments of this application, the battery device further includes a connecting piece, the material stiffness of which is greater than that of the pressing member; the connecting piece has a third hole, the second connecting portion passes through the third hole, and the connecting piece is sandwiched between the pressing member and the first connecting portion.

[0019] In this embodiment, by setting a connecting piece with higher stiffness to strengthen the connection between the pressing member and the limiting member, it is beneficial to improve the tensile strength of the connection position between the pressing member and the limiting member, thereby reducing the risk of separation between the pressing member and the limiting member.

[0020] In one or more embodiments of this application, along the first direction, the orthographic projection of the third hole is located within the orthographic projection range of the first hole. Thus, the connecting piece can be stressed before the pressing member, which helps reduce the risk of decreased anti-expansion capability of the limiting member or fastener misalignment due to creep in the first hole.

[0021] In one or more embodiments of this application, the recess is located in the middle of the first wall, and two protrusions are located on either side of the recess. Thus, the protrusions can shield the pressure relief mechanism, reducing the impact of substances released by thermally runaway battery cells on adjacent battery cells, thereby reducing the risk of thermal propagation.

[0022] In one or more embodiments of this application, the pressing member is bonded to the protrusion. This helps to improve the positional stability of the battery cell, thereby increasing the main frequency of the battery device.

[0023] In one or more embodiments of this application, the electrode assembly includes a main body and a tab, the tab being connected to one side of the main body along a first direction, and at least a portion of the tab being received in a space enclosed by a protrusion.

[0024] In this embodiment, at least a portion of the tab is housed within the space enclosed by the protrusion, which helps to make full use of the space inside the casing, thereby improving the volumetric energy density of the battery cell.

[0025] In one or more embodiments of this application, the battery cell further includes electrode terminals disposed in the recess and electrically connected to the electrode assembly, with at least a portion of the electrode terminals extending out of the housing along a first direction.

[0026] In this embodiment, placing the electrode terminals in the recessed portion helps to reduce the space occupied by the electrode terminals in the first direction, thereby reducing the risk that the height of the electronic terminals will make it difficult to thin the pressing member.

[0027] In one or more embodiments of this application, the protrusion extends beyond the electrode terminal along the first direction. This helps to further reduce the space occupied by the electrode terminal in the first direction.

[0028] A second aspect of the embodiments of this application provides an electrical device that includes a battery device as described in any of the foregoing embodiments. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 the drawings without creative effort.

[0030] Figure 1 These are schematic diagrams of the vehicle structure in some embodiments of this application.

[0031] Figure 2 This is an exploded view of the battery device in some embodiments of this application.

[0032] Figure 3 These are schematic diagrams of the structure of a single battery cell in some embodiments of this application.

[0033] Figure 4 These are schematic diagrams of the internal structure of a single battery cell in some embodiments of this application.

[0034] Figure 5 This is a partial structural schematic diagram of the battery device in some embodiments of this application.

[0035] The accompanying drawings are not drawn to scale.

[0036] Explanation of key component symbols: 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor; 10. Box body; 11. First box body; 111. Second wall; 12. Second box body; 121. Bottom wall; 122. Frame; 20. Battery cell assembly; 21. Battery cell; 211. Housing; 2111. First wall; 2111a. Recess; 2111b. Protrusion; 2112. Housing body; 2113. Top cover; 212. Electrode assembly; 2121. Main body; 2122. Electrode tab; 2123. Adapter; 213. Pressure relief mechanism; 214. Electrode terminal; 30. Pressing component; 31. First part; 32. Second part; 40. Limiting component; 50. Fastener; 60. Connecting piece; X, first direction; Y, second direction. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0039] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0042] In this application, "multiple" means two or more (including two).

[0043] Currently, judging from market trends, the application of various battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as 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. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0044] In existing technologies, battery devices typically include a housing and multiple battery cells housed within it. Each battery cell is equipped with a pressure relief mechanism configured to open when the internal pressure exceeds a threshold, thereby releasing pressure and reducing the risk of cell explosion. Therefore, sufficient venting space is required between the battery cell's pressure relief mechanism and the housing to improve venting efficiency. Currently, battery devices typically incorporate a pressure-blocking member on the wall where the battery cell's pressure relief mechanism is located. This member connects to the battery cell and supports the housing, creating a venting space between the housing and the pressure relief mechanism. Since the size of this venting space affects the venting efficiency of the battery cell, the pressure-blocking member needs a certain thickness to meet venting requirements. In other words, the size requirements of the venting space constrain the thickness of the pressure-blocking member, making it difficult to make it thinner and further reducing the cost of the battery device.

[0045] In view of this, embodiments of this application provide a battery device and power supply setup, which aim to reduce the thickness of the pressure member, thereby reducing the cost of the battery device.

[0046] In embodiments of this application, the battery device includes a housing, a battery cell assembly, and a pressure-retaining member. The housing forms a receiving space, within which the battery cell assembly is housed. The battery cell assembly includes multiple battery cells, each battery cell including a housing and an electrode assembly housed within the housing. The housing includes a first wall located on one side of the housing along a first direction. A portion of the first wall is recessed inward along the first direction to form a recessed portion, and a non-recessed portion of the first wall forms a protrusion. The battery cell also includes a pressure relief mechanism disposed in the recessed portion. The housing has a second wall, and the pressure relief mechanism faces the second wall along the first direction. Along the first direction, one side of the pressure-retaining member is connected to the protrusion, and the other side of the pressure-retaining member is connected to the second wall to form a venting space between the second wall and the pressure relief mechanism.

[0047] In the embodiments of this application, by providing a pressure-retaining member between the battery cell and the second wall, it is beneficial to reduce the risk of the second wall deforming and encroaching on the exhaust space; by providing the pressure relief mechanism of the battery cell in the recessed part and the pressure-retaining member in the protruding part, a larger exhaust space can be left between the pressure relief mechanism and the second wall of the housing, which is beneficial to reduce the requirement for the thickness of the pressure-retaining member, thereby reducing costs.

[0048] The battery devices and electrical equipment provided in the embodiments of this application are applicable to various battery-using devices, including but not limited to mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0049] The battery device and electrical equipment described in this application are not limited to the devices described above, but can also be applied to all devices that use batteries. However, for the sake of brevity, the following embodiments are all described using vehicles as electrical equipment.

[0050] The following description, in conjunction with the accompanying drawings, will explain the battery device and electrical equipment proposed in this application.

[0051] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 in some embodiments of this application. The vehicle 1000 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, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0052] In some embodiments, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 1000.

[0053] Please refer to Figures 2 to 4 , Figure 2 These are exploded view diagrams of the battery device in some embodiments of this application. Figure 3 These are schematic diagrams of the structure of a single battery cell in some embodiments of this application. Figure 4 This is a schematic diagram of the internal structure of a battery cell in some embodiments of this application. In the embodiments provided in this application, the battery device 100 includes a housing 10, a battery cell assembly 20, and a pressing member 30. The housing 10 has a receiving space, within which the battery cell assembly 20 is housed. The battery cell assembly 20 includes multiple battery cells 21. Each battery cell 21 includes a housing 211 and an electrode assembly 212 housed within the housing 211. The housing 211 includes a first wall 2111 located on one side of the housing 211 along a first direction X. A portion of the first wall 2111 is recessed into the housing 211 along the first direction X to form a recess 2111a, and a portion of the first wall 2111 that is not recessed forms a protrusion 2111b. The battery cell 21 also includes a pressure relief mechanism 213 disposed in the recess 2111a. The housing 10 has a second wall 111, and the pressure relief mechanism 213 is positioned towards the second wall 111 along the first direction X. An exhaust space is formed between the second wall 111 and the pressure relief mechanism 213. Along the first direction X, one side of the pressure-relief member 30 is connected to the protrusion 2111b.

[0054] In the embodiments of this application, by providing a pressure-retaining member 30 between the battery cell 21 and the second wall 111, it is beneficial to reduce the risk of the second wall 111 deforming and encroaching on the exhaust space. By providing the pressure relief mechanism 213 of the battery cell 21 in the recessed portion 2111a and the pressure-retaining member 30 in the protruding portion 2111b, a larger exhaust space can be left between the pressure relief mechanism 213 and the second wall 111 of the housing 10, which is beneficial to reduce the requirement for the thickness of the pressure-retaining member 30, thereby reducing costs.

[0055] The housing 10 can be understood as an element that houses and protects the battery cell assembly 20. The housing 10 can be formed by connecting different parts. For example, the housing 10 may include a first housing 11 and a second housing 12, which overlap each other, defining a space for housing the battery cell assembly 20. The second housing 12 can be a hollow structure with one open end, and the first housing 11 can be a plate-like structure, covering the open side of the second housing 12 so that the first housing 11 and the second housing 12 together define the space. Alternatively, the first housing 11 and the second housing 12 can both be hollow structures with one open side, with the open side of the first housing 11 covering the open side of the second housing 12. Of course, the housing 10 formed by the first housing 11 and the second housing 12 can be of various shapes, such as a cylinder or a cuboid. The first housing 10 and the second housing 20 can be made of the same material or different materials, and at least one of them can be made of a composite material. In some embodiments, the first housing 11 includes a top wall, and the second housing 12 includes a bottom wall 121. The top wall and the bottom wall 121 are disposed opposite each other along a first direction X. One of the top wall and the bottom wall 121 can be the second wall 111 described above. In other words, when the battery device 100 is in use, the pressure relief mechanism 213 faces one of the top wall and the bottom wall 121. In other embodiments, the second wall 111 can also be other wall surfaces of the housing 10. For example, the second housing 12 can include a bottom wall 121 and a frame 122 surrounding the edge of the bottom wall 121. The pressure relief mechanism 213 of the battery cell 21 faces the frame 122. Thus, the wall surface of the frame 122 facing the battery cell 21 can serve as the second wall 111. Figure 2 The embodiment shown is in which the top wall is used as the second wall 111.

[0056] The battery cell assembly 20 includes multiple battery cells 21, which provide voltage and capacity. The multiple battery cells 21 can be electrically connected in series, parallel, or mixed connections; here, a mixed connection can be understood as including both series and parallel connections. The casing 211 of the battery cell 21 can be made of a metallic material, such as aluminum or steel, to provide some protection for the electrode assembly 212.

[0057] In some embodiments, the housing 211 includes a housing body 2112 and a top cover 2113. The top cover 2113 covers the housing body 2112, thereby forming a space for accommodating the electrode assembly 212. The top cover 2113 and the housing body 2112 can be connected by adhesive or welding. A pressure relief mechanism 213 is disposed on the housing 211, which can be disposed on the top cover 2113 or on the housing body 2112. The wall surface of the housing 211 where the pressure relief mechanism 213 is located is the first wall 2111 mentioned above. Figure 3 The illustration shows an embodiment where the top cover 2113 serves as the first wall 2111. A recess 2111a and a protrusion 2111b are formed on the first wall 2111. These can be formed by the overall deformation of the first wall 2111, for example, by stamping the first wall 2111 to form the protrusion 2111b and the recess 2111a; they can also be formed during the fabrication process of the first wall 2111, for example, by die-casting the first wall 2111 to form the protrusion 2111b and the recess 2111a; or they can be formed by a cutting process, for example, by removing material from a portion of the first wall 2111 to form the recess 2111a, and leaving the portion without material removal to form the protrusion 2111b.

[0058] In some embodiments, the pressing member 30 is made of a metallic material, such as steel; in other embodiments, the pressing member 30 is made of a non-metallic material, such as plastic; in still other embodiments, the pressing member 30 may also be made of a composite material of metallic and non-metallic materials.

[0059] In some embodiments, the other side of the pressing member 30 is connected to the second wall 111, and the pressing member 30 can provide support for the second wall 111, which helps to reduce the risk of deformation of the second wall 111.

[0060] In some embodiments, the other side of the pressing member 30 is bonded to the second wall 111. This helps to improve the positional stability of the pressing member 30 and reduce the risk of misalignment or displacement of the pressing member 30.

[0061] In some embodiments, the pressing member 30 is bonded to the protrusion 2111b. This helps to improve the positional stability of the battery cell 21, thereby increasing the main frequency of the battery device 100.

[0062] In some embodiments, the pressing member 30 is bonded to both the second wall 111 and the protrusion 2111b. This improves the overall integrity of the battery device 100, thereby increasing the main frequency of the battery device 100.

[0063] In some embodiments, please refer to Figure 2The battery cell assembly 20 is arranged in multiple rows, and each row of battery cell assembly 20 includes multiple battery cells 21 arranged along the second direction Y, which is perpendicular to the first direction X. The battery device 100 also includes a limiting member 40, which is connected to the housing 10. Along the second direction Y, the battery cell assembly 20 is sandwiched between two limiting members 40, and the pressing member 30 is connected to the two limiting members 40 at opposite ends along the second direction Y.

[0064] The limiting member 40 can be understood as a component disposed at the end of the battery cell assembly 20 along the second direction Y. The limiting member 40 is used to resist the expansion force generated by the battery cell 21 during operation, so as to maintain the performance of the battery cell 21 and reduce lithium plating. The limiting member 40 can be a component disposed within the housing 10. For example, the limiting member 40 can be a beam structure within the housing 10, or the limiting member 40 can be part of the structure of the housing 10 itself; for example, the second housing 12 includes a bottom wall 121 and a frame 122, and the frame 122 can act as the limiting member 40 to resist the expansion force generated by the battery cell 21.

[0065] In this embodiment, connecting the pressing member 30 with the limiting member 40 helps to improve the ability of the limiting member 40 to resist expansion force; and the connection between the pressing member 30 and the limiting member 40 constrains the battery cell assembly 20, which helps to improve the main frequency of the battery device 100.

[0066] In some embodiments, the pressure member 30 is an elongated structure extending along the second direction Y, and multiple pressure members 30 are spaced apart, with each row of battery cell assembly 20 corresponding to at least one pressure member 30; along the first direction X, at least a portion of the pressure relief mechanism 213 is not blocked by the pressure member 30.

[0067] In this embodiment, multiple pressing members 30 are provided, which helps to further improve the anti-expansion capability of the limiting member 40 and further improve the main frequency of the battery device 100; in addition, the pressing members 30 are spaced apart, which helps to save materials.

[0068] In some embodiments, please refer to the collection. Figure 2 Reference Figure 5 The pressure member 30 is a plate-shaped structure extending along the second direction Y. The pressure member 30 includes a first part 31 and a second part 32 connected to each other. The first part 31 is connected to the protrusion 2111b along the first direction X. The second part 32 is separated from the pressure relief mechanism 213, and an exhaust space is formed between the second part 32 and the pressure relief mechanism 213.

[0069] In this embodiment, the pressing member 30 is provided with a plate-like structure, which helps to improve the strength of the pressing member 30, thereby improving the anti-expansion effect of the limiting member 40.

[0070] In some embodiments, the second portion 32 is connected to the second wall 111. This increases the contact area between the pressing member 30 and the second wall 111, thereby improving the supporting effect of the pressing member 30 on the second wall 111.

[0071] In some embodiments, the second portion 32 is bonded to the second wall 111. This improves the overall integrity of the battery device 100, thereby increasing the main frequency of the battery device 100.

[0072] In some embodiments, please refer to Figure 5 The battery device 100 also includes a fastener 50, which includes a first connecting part and a second connecting part. The first connecting part is connected to one end of the second connecting part along a first direction X. The pressing member 30 has a first hole, and the limiting member 40 has a second hole. The second connecting part passes through the first hole and the second hole and is detachably connected to the limiting member 40. The first connecting part presses against the pressing member 30.

[0073] In this embodiment, the pressing member 30 and the limiting member 40 are detachably connected by the fastener 500, which helps to improve the convenience of installing and removing the pressing member 30 and reduce the maintenance cost of the battery device 100.

[0074] In some embodiments, please refer to Figure 5 The battery device 100 also includes a connecting piece 60, the material rigidity of the connecting piece 60 being greater than that of the pressing member 30; the connecting piece 60 has a third hole, the second connecting part passes through the third hole, and the connecting piece 60 is sandwiched between the pressing member 30 and the first connecting part.

[0075] In this embodiment, by providing a connecting piece 60 with higher stiffness to strengthen the connection between the pressing member 30 and the limiting member 40, it is beneficial to improve the tensile strength of the connection position between the pressing member 30 and the limiting member 40, thereby reducing the risk of separation between the pressing member 30 and the limiting member 40.

[0076] In some embodiments, along the first direction X, the orthographic projection of the third hole lies within the orthographic projection range of the first hole. Thus, the connecting piece can be stressed before the pressing member 30, which helps reduce the risk of decreased expansion resistance of the limiting member 40 or disengagement of the fastener 50 due to creep in the first hole.

[0077] In some embodiments, please refer to Figure 3 The recess 2111a is located in the middle of the first wall 2111, and the two protrusions 2111b are located on both sides of the recess 2111a. In this way, the protrusions 2111b can shield the pressure relief mechanism 213, reduce the impact of substances released by the thermally runaway battery cell 21 on adjacent battery cells 21, and thus reduce the risk of thermal propagation.

[0078] In some embodiments, please refer to Figure 4 The electrode assembly 212 includes a main body 2121 and an electrode tab 2122. The electrode tab 2122 is connected to one side of the main body 2121 along the first direction X, and at least a portion of the electrode tab 2122 is received in a space enclosed by the protrusion 2111b.

[0079] In this embodiment, at least a portion of the tab 2122 is housed in the space enclosed by the protrusion 2111b, which helps to make full use of the space inside the housing 211, thereby helping to improve the volumetric energy density of the battery cell 21.

[0080] In some embodiments, the main body 2121 includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell 21, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0081] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0082] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0083] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0084] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4, also known as LFP), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co At least one of the following: 0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.8Co0.15Al0.05O2), and their modified compounds. Modified compounds refer to substances obtained by doping or coating, etc., based on the above-mentioned materials.

[0085] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0086] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0087] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0088] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0089] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0090] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0091] In other embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0092] In some embodiments, the positive electrode, the separator, and the negative electrode are sequentially stacked and then wound to form a wound structure; in other embodiments, multiple positive electrode sheets, multiple separators, and multiple negative electrode sheets are alternately stacked to form a stacked structure.

[0093] In some embodiments, the tab 2122 includes a positive tab and a negative tab. The positive tab is connected to the positive electrode of the main body 2121, for example, the positive tab is connected to the positive current collector; the negative tab is connected to the negative electrode of the main body 2121, for example, the negative tab is connected to the negative current collector. The positive tab and the positive current collector can be an integral structure, and the positive tab and the positive current collector can also be connected by bonding or welding; the connection method between the negative tab and the negative current collector can refer to the connection method between the positive tab and the positive current collector. Multiple positive tabs and multiple negative tabs can be provided, and multiple positive tabs stacked together form a positive tab bundle, and multiple negative tabs stacked together form a negative tab bundle. The tab 2122 can be electrically connected to the outer casing 211 of the battery cell 21, or it can be electrically connected to the electrode terminal 214 of the battery cell 21; or, one of the positive tabs and the negative tab can be electrically connected to the outer casing 211, and the other can be electrically connected to the electrode terminal 214.

[0094] In some embodiments, the tab 2122 is electrically connected to the electrode terminal 214 via an adapter 2123. The adapter 2123 can be a metal sheet, such as an aluminum sheet, a copper sheet, or a nickel sheet, and the tab 2122 and the electrode terminal 214 can be soldered to the adapter 2123 respectively.

[0095] In some embodiments, the battery cell 21 includes an electrode terminal 214 disposed in the recess 2111a and electrically connected to the electrode assembly 212, with at least a portion of the electrode terminal 214 extending out of the housing 211 along a first direction X.

[0096] In this embodiment, the electrode terminal 214 is disposed in the recess 2111a, which helps to reduce the space occupied by the electrode terminal 214 in the first direction X, thereby reducing the risk that the height of the electronic terminal 215 will make it difficult to thin the pressing member 30.

[0097] In some embodiments, the electrode terminal 214 is insulated from the housing 211; in other embodiments, the electrode terminal 214 includes a positive electrode terminal and a negative electrode terminal, one of which is insulated from the housing 211 and the other is electrically connected to the housing 211.

[0098] In some embodiments, the protrusion 2111b extends beyond the electrode terminal 214 along the first direction X. This helps to further reduce the space occupied by the electrode terminal 214 in the first direction X and increase the exhaust space of the pressure relief structure 213.

[0099] Embodiments of this application also provide an electrical device that includes the battery device 100 described in any of the foregoing embodiments. Since this electrical device includes the aforementioned battery device 100, it also possesses the advantages of the battery device 100, which will not be elaborated upon here.

[0100] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 includes: A housing, wherein the housing forms an accommodating space; A battery cell assembly is housed within the receiving space. The battery cell assembly includes multiple battery cells. Each battery cell includes a housing and an electrode assembly housed within the housing. The housing includes a first wall located on one side of the housing along a first direction. A portion of the first wall is recessed inward along the first direction to form a recessed portion, and a non-recessed portion of the first wall forms a protrusion. Each battery cell also includes a pressure relief mechanism disposed in the recessed portion. The housing has a second wall, with the pressure relief mechanism facing the second wall along the first direction. A venting space is formed between the second wall and the pressure relief mechanism. A pressing member, along the first direction, has one side connected to the protrusion.

2. The battery device according to claim 1, characterized by The other side of the pressing member is connected to the second wall.

3. The battery device of claim 2, wherein, The other side of the pressing member is bonded to the second wall.

4. The battery device of claim 1, wherein The battery cell assembly is arranged in multiple rows, and each row of the battery cell assembly includes a plurality of battery cells arranged along a second direction, which is perpendicular to the first direction; The battery device further includes a limiting member connected to the housing. Along the second direction, the battery cell assembly is sandwiched between two limiting members, and the pressing member is connected to the two limiting members at opposite ends along the second direction.

5. The battery device of claim 1, wherein The pressing member is a long strip structure extending along the second direction, and multiple pressing members are arranged at intervals. Each row of battery cell assembly corresponds to at least one pressing member, and the second direction is perpendicular to the first direction. Along the first direction, at least a portion of the pressure relief mechanism is not blocked by the pressure-blocking member.

6. The battery device of claim 1, wherein The pressure-blocking member is a plate-shaped structure extending along a second direction. The pressure-blocking member includes a first part and a second part connected to each other, and the second direction is perpendicular to the first direction. The first part is connected to the protrusion, and along the first direction, the second part is separate from the pressure relief mechanism, and the exhaust space is formed between the second part and the pressure relief mechanism.

7. The battery device of claim 6, wherein The second part is connected to the second wall.

8. The battery device of claim 6, wherein, The second part is bonded to the second wall.

9. The battery device of claim 4, wherein, The battery device further includes a fastener, which includes a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to one end of the second connecting portion along the first direction; The pressing member has a first hole, the limiting member has a second hole, the second connecting part passes through the first hole and the second hole and is detachably connected to the limiting member, and the first connecting part presses against the pressing member.

10. The battery device of claim 9, wherein, The battery device further includes a connecting piece, the material stiffness of which is greater than that of the pressing member; The connecting piece has a third hole, the second connecting part passes through the third hole, and the connecting piece is sandwiched between the pressing member and the first connecting part.

11. The battery device of claim 10, wherein, Along the first direction, the orthographic projection of the third hole lies within the orthographic projection range of the first hole.

12. The battery device of claim 1, wherein, The recessed portion is located in the middle of the first wall, and the two protrusions are located on both sides of the recessed portion.

13. The battery device of any one of claims 1-12, wherein, The pressing member is bonded to the protrusion.

14. The battery device of any one of claims 1-12, wherein, The electrode assembly includes a main body and an electrode tab, the electrode tab being connected to one side of the main body along the first direction, and at least a portion of the electrode tab being received in a space enclosed by the protrusion.

15. The battery device of any one of claims 1-12, wherein, The battery cell further includes an electrode terminal, which is disposed in the recess and electrically connected to the electrode assembly. At least a portion of the electrode terminal extends out of the housing along the first direction.

16. The battery device of claim 15, wherein, Along the first direction, the protrusion extends beyond the electrode terminal.

17. An electrical device, characterized by Includes the battery device as described in any one of claims 1-16.

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